US20020039286A1 - Integrated computer module with emi shielding plate - Google Patents
Integrated computer module with emi shielding plate Download PDFInfo
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- US20020039286A1 US20020039286A1 US09/283,931 US28393199A US2002039286A1 US 20020039286 A1 US20020039286 A1 US 20020039286A1 US 28393199 A US28393199 A US 28393199A US 2002039286 A1 US2002039286 A1 US 2002039286A1
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- pcba
- enclosure
- computer module
- disk drive
- integrated computer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/183—Internal mounting support structures, e.g. for printed circuit boards, internal connecting means
- G06F1/187—Mounting of fixed and removable disk drives
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/181—Enclosures
- G06F1/182—Enclosures with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/183—Internal mounting support structures, e.g. for printed circuit boards, internal connecting means
- G06F1/184—Mounting of motherboards
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/1493—Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges
Definitions
- the invention relates generally to integrated computer modules and, more specifically, to an integrated computer module of compact construction having an intermediate plate which captures a magnetic disk drive in the module and protects the disk drive from electromagnetic interference.
- PC's personal computers
- desktop PC's are usually sold in a desktop configuration or a notebook configuration.
- Desktop PC's are generally housed in a relatively large chassis containing a main printed circuit board or “motherboard” and other components that are incorporated into or connected to the motherboard.
- the components may be located inside or outside of the chassis.
- Typical internal components include a power supply, a central processing unit (CPU), random access memory (RAM), a mass storage device such as a magnetic disk drive, expansion cards connected to a bus on the motherboard, and various peripherals mounted on “rails” in “bays” within the chassis and electrically connected to the motherboard or an associated expansion card by a ribbon cable or the like.
- Typical expansion cards are a SCSI adapter, a sound adapter, and a network adapter.
- Typical bay-mounted peripherals are a magnetic disk drive, a floppy drive, a tape drive or a CD-ROM drive.
- Typical external “peripherals” include user input devices such as a keyboard, a mouse, a microphone, a joystick, a graphics tablet or a scanner) and user output devices such as speakers a printer, and a video display device (e.g. a CRT display or an LCD display).
- the video adapter that controls the display, as with other adapters, may be integrated into the motherboard or provided on a separate expansion card.
- the users of desktop PC's may be divided into two divergent groups: (1) experienced users who understand the individual components and tend to frequently upgrade their PC's by replacing such components, and (2) new users who do not understand or even want to understand the individual components.
- the latter group may prefer to replace the entire PC, if they upgrade at all.
- both groups it has been observed that the need or desire to upgrade occurs far sooner with respect to some components than with respect to other components.
- users more frequently upgrade the CPU, the RAM, the magnetic disk drive, and the video adapter.
- These upgrades tend to provide more capacity and more speed because of rapid technological advancements on the part of manufacturers in response to ever-increasing demands from ever more complicated and more graphics intensive software applications and an associated increase in file sizes.
- Both user-types less frequently need or desire to upgrade the monitor, the speakers, the keyboard or the power supply, however, because these latter components have withstood the test of time and employ technologies that are less prone to obsolescence.
- an integrated computer module that compactly houses the frequently upgraded components (e.g. the CPU, the memory, the disk drive, and the video adapter) and provides a module connector for interfacing the module's electronics with peripherals
- a “host assembly” with a docking bay that receives the module and provides a host connector that mates with the module connector.
- the host assembly can comprise any “shell” that includes the bay that receives the integrated computer module.
- the docking bay may be in a host assembly that doubles as a peripheral or in an intermediate assembly that is connected to conventional peripherals.
- the host assembly may function and appear generally like a conventional CRT display, save for the addition of the docking bay.
- a CRT-like host assembly of this nature would also provide a first connector for receiving input from a keyboard and, in all likelihood, a second connector for receiving input from a mouse.
- the host assembly may appear like a conventional tower chassis that contains a docking bay for receiving the module, and suitable electronics (e.g. a PCB, cables, and so on) to interface the integrated computer module to conventional expansion cards via an expansion bus, and to conventional peripherals like a display, a keyboard, and a mouse, via connector ports built-in to the host assembly or carried by an expansion card.
- suitable electronics e.g. a PCB, cables, and so on
- the invention may be regarded as an integrated computer module adapted for removable insertion into a docking bay within a host assembly, and upon such insertion for connecting to a host connector and thereby controlling a display device
- the integrated computer module comprising: an enclosure defined by a front wall, a back wall opposite the front wall, a first side wall, a second side wall opposite the first guide wall, a floor wall and a ceiling wall; a main printed circuit board assembly (main PCBA) located in the enclosure, the main PCBA including a microprocessor clocked at high frequency and generating electromagnetic interference (EMI); a module connector electrically connected to the main PCBA and supported at the enclosure's back wall for connection to the host connector upon insertion of the integrated module into the docking bay in the host assembly; a disk drive including a casting and a controller PCBA mounted on one side of the casting, the controller PCBA including integrated circuits that define a hard disk storage control subsystem that operates with relatively low amplitude signals that are subject to distortion from EMI;
- main PCBA main printed circuit
- FIG. 1 is a perspective view of an integrated computer module that may be used with a host assembly according to this invention
- FIG. 2 is an exploded view of the integrated computer module of FIG. 1;
- FIG. 2A shows a partially assembled integrated computer module with emphasis on the intermediate plate and its interconnection to the tub;
- FIG. 2B is an exploded view of the integrated computer module of FIG. 2A;
- FIG. 3 is a rear view of the integrated computer module of FIG. 1;
- FIG. 4 is a section view of FIG. 3 taken along section lines 4 - 4 ;
- FIG. 5 is a rear perspective view of a host assembly that contains a CRT display and is configured to appear like a conventional CRT monitor;
- FIG. 6 is a front perspective view of a host assembly configured to appear like a conventional tower chassis that may be connected to a monitor, a keyboard, and a mouse (not shown);
- FIG. 7 is a generalize cutaway view of a docking bay according to this invention, suitable for use in a host assembly like those illustrated in FIGS. 5 and 6 and configured to receive, electrically mate with, and retain an integrated computer module like the one shown in FIG. 1;
- FIG. 7A is a cutaway plan view of the integrated computer module partially inserted into a host assembly to illustrate engagement with the projecting member
- FIG. 8 is an elevational view of an adapter PCB for transforming a standard 51 ⁇ 4′′ peripheral bay of a conventional chassis into a docking bay according to this invention
- FIG. 9 is a side view of the adapter PCB of FIG. 8 and an associated adapter sleeve that is externally sized for insertion into a standard 51 ⁇ 4′′ drive bay and is internally sized for receiving an integrated computer module like the one shown in FIG. 1;
- FIG. 10 is a top view of the adapter sleeve of FIG. 9;
- FIG. 11 is a rear view of the adapter sleeve of FIG. 9.
- FIG. 12 is a side view of a preferred bay configuration (shown here in connection with an adapter sleeve) wherein the host connector is incorporated into the edge of a main host PCB;
- FIG. 1 shows an integrated computer module (ICM) 100 that may be used in a host assembly having a docking bay according to this invention.
- the ICM 100 generally comprises a metal enclosure (not shown in FIG. 1, but see FIG. 2) that may be aesthetically surrounded by a case comprising, for example, a sleeve 180 and an associated bezel or faceplate 181 .
- the preferred faceplate 181 includes cooling apertures 186 and a handle 182 for carrying the ICM 100 and for pushing or pulling the ICM 100 into or out of a docking bay (not shown in FIG. 1).
- the preferred sleeve 180 includes at least one key feature such as chamfered edge 189 that mates with a corresponding key feature in the docking bay.
- key feature 189 comprises a chamfered edge along one corner of the substantially rectangular periphery of the sleeve 180 which mates with a corresponding chamfered corner 389 (shown in FIGS. 5,6) of the docking bay.
- the sleeve 180 and faceplate 181 are preferably injection molded components made of any suitable material such as ABS, PVC, or engineered plastics.
- the preferred ICM 100 of FIG. 1 also includes an aperture 184 in the faceplate 181 for exposing an optional PCI Mezzanine (PCM) card 160 that provides additional functionality such as an ethernet port, a SCSI port, or other desired function.
- PCM PCI Mezzanine
- a blank PCM cover plate may be located in the aperture 184 in the absence of a PCM card 160 .
- FIG. 2 is an exploded view of the ICM 100 of FIG. 1, showing the presently preferred construction in more detail.
- the ICM 100 is designed so that it can be assembled by hand or more efficiently, and more cost effectively assembled using automated assembly techniques.
- the components of the preferred ICM 100 are generally assembled, from above, into an open-top case or “tub” 110 .
- the preferred ICM 100 in other words, is assembled in a successively stacked, layer by layer arrangement.
- the tub 110 and all of the components therein are ultimately covered with a ceiling wall 119 and then, if appropriate for the desired application, enclosed in the sleeve 180 and faceplate 181 that form the outer case shown in FIG. 1.
- the preferred ceiling wall 119 makes a snap-on connection to the tub 110 to speed assembly and eliminate the necessity for any threaded fasteners or the like.
- the tub 110 has a floor wall 111 , a front wall 112 , back wall 113 opposite the front wall, a first side wall 114 , and a second side wall 115 opposite the first side wall.
- an intermediate wall 116 is also provided between the first side wall 114 and the second side wall 115 .
- the tub 100 includes front and rear cooling apertures indicated at 107 , 109 in the front and back walls respectively for passage of cooling air.
- the tub 110 is designed to minimize leakage of electromagnetic interference (EMI) in accordance with FCC requirements. Accordingly, the tub 110 and associated ceiling wall 119 are metallic and the cooling apertures 107 , 109 are sized and configured to meet the desired EMI requirements at the frequencies of interest.
- EMI electromagnetic interference
- the ICM's internal components generally include a shock mount system 120 , a disk drive 130 that is supported in the shock mount system 120 and may have a controller PCBA 131 mounted on one side thereof, an intermediate plate 140 , a main PCBA 150 , and an optional PCM expansion card 160 as mentioned above.
- the main PCBA 150 includes a microprocessor such as an Intel Pentium (not shown) located beneath a suitable heat sink 153 , first and second memory module connectors 156 for holding memory modules 157 of a suitable type and desired capacity (e.g. Single Inline Memory Modules, or Dual Inline Memory Modules), and a module connector 154 for interfacing the overall ICM 100 to a host assembly.
- the ICM 100 further includes a locking mechanism 190 that engages a projecting member (discussed below) in the docking bay.
- the preferred locking mechanism 190 mechanically snaps into a corner of the tub 110 between an upper slot 118 and a lower slot (not shown).
- the tub 110 and its interior components are encased in the sleeve 180 and the associated faceplate 181 .
- the faceplate 181 includes a handle 182 for carrying the entire ICM, it is important that the faceplate 181 have a secure, mechanical connection to the tub 110 .
- the presently preferred construction for such a positive, mechanical connection comprises two pairs of backwardly-extending fingers 187 having inwardly extending detents (not shown), one pair on each side of the faceplate 181 , and two corresponding pairs of slots 117 on the first and second side walls 114 , 115 of the tub 110 .
- the faceplate 181 is initially pressed onto the tub 110 until the detents on its fingers 187 engage the slots 117 .
- the tub 110 is inserted into the sleeve 180 , the sleeve 180 thereby encasing the tub 110 and the fingers 187 so that they cannot splay outward and disengage from the slots 117 .
- FIG. 3 shows a rear view of a fully assembled ICM 100 , the side that interfaces with a host assembly having a docking bay as described further below. As shown, substantially all of the back wall 113 is exposed at a rear end of the sleeve 180 to provide access to the module connector 154 , the cooling apertures 109 , and a module aperture 80 .
- FIG. 4 is a cross-sectional view of the preferred module aperture 80 in FIG. 3.
- FIG. 4 shows that the preferred module aperture 80 has radius edges 81 having a depth “D” that is greater than a width “W” of an annular groove 282 contained in a projecting member 280 .
- the preferred module aperture 80 is formed by stamping or punching through the back wall 113 .
- the preferred shock mount system 120 comprises four corner pieces 126 and four buttons 146 that are each formed from an elastomeric material, the preferred material being Sorbathane sold by Sorbathane, Inc.
- the corner pieces 126 each have a base and two intersecting, substantially perpendicular walls (not separately numbered) extending upwardly from the base (not separately numbered).
- the corner pieces 126 are simply located with their bases on the floor wall 111 of the tub 110 , and with their upstanding walls in the corners defined by the front wall 112 , the back wall 113 , the first side wall 114 , and the intermediate wall 116 .
- the upstanding walls of the corner pieces 126 are sized to provide a firm press fit relationship when compressed between the disk drive 130 and the surrounding walls 112 , 113 , 114 , 116 .
- the four button 146 are placed in wells (not shown) formed in the intermediate plate 140 to capture an opposite side of the disk drive 130 as described further below.
- the presently preferred shock mounting system 120 requires us to orient the disk drive 130 with its controller board 131 facing upward, i.e. in a “board-up” orientation.
- the board-up orientation is preferred because it places the controller board 131 as close as possible to the main PCBA 150 , thereby allowing a short cable with minimal signal degradation.
- a short cable is not especially important in the context of an IDE connection to the disk drive. Because of ever increasing CPU power, however, the CPU may control the disk drive via an ordinary expansion bus such as the PCI bus. A short cable is critical in the context of a PCI connection to a disk drive.
- the board-up orientation is also preferred because the shock mounts 126 will not block access to the connectors 132 that are on the controller board 131 . It is also desirable to mount the disk drive 130 board-up because the other side of the disk drive presents a clean, solid volume for contact with the shock mount system 120 .
- the disk drive 130 therefore, is oriented board side up and then pressed down onto and in between the four corner pieces.
- the intermediate plate 140 is snapped into the tub 110 , between the first side wall 114 and an intermediate wall 116 , to firmly hold the disk drive 130 downward on the corner pieces 126 .
- the controller board 131 is recessed into the disk drive's aluminum casting 132 , leaving a pair of elongated casting rails 133 extending up above the board 131 .
- the upper shock mounts (elastomeric buttons) 146 are bonded to the intermediate plate 140 .
- the buttons 146 press down against the elongated rails 133 of the casting 132 . Consequently, the buttons 146 isolate the intermediate plate 140 from the rails 133 , thereby enabling the shock mount system 120 to mechanically couple the disk drive 130 to the tub 110 via a shock-isolating, elastomeric interface.
- the intermediate plate 140 also protects the disk drive's controller board 131 from electromagnetic interference (EMI) emanating from the main PCBA 150 .
- the main PCBA 150 transmits significant amounts of RF energy over a wide frequency spectrum because it has synchronously clocked components that operate at relatively high power levels (e.g. greater than 5 watts) and at a plurality of relatively high clock frequencies (e.g. 66 MHz, 100 MHz, 500 MHz, and so on).
- the disk drive's controller PCBA 131 contains circuitry that operates at relatively low millivolt levels that are associated with reading and writing data to and from the disk drive 130 .
- the intermediate plate 140 therefore, beneficially functions as an EMI shield in addition to securing the disk drive 130 in the tub 110 .
- the preferred plate 140 is made of the same metallic material as the remainder of the tub 110 so that it represents an intermediate ground plane that tends to arrest conducted and radiated RF energy.
- FIG. 2A shows the intermediate plate 140 and its interconnection to the tub 110 in more detail.
- the intermediate plate 140 has a central section, a front edge, a back edge opposite the front edge, a first side edge, and a second side edge opposite the first side edge.
- the preferred intermediate plate 140 has a pair of tabs 141 on its first side edge which interface with a corresponding pair of slots (not numbered) in the first side wall 114 .
- the second side of the plate includes a pair of downwardly-extending fingers 143 that mate with one side of the intermediate wall 116 and an elongated lip 144 that mates with an opposite side of the intermediate wall 116 .
- the downwardly-extending fingers 143 have detents (see FIG. 2B) which mate with slots (not shown) in the intermediate wall 116 .
- FIG. 2B is an exploded view of FIG. 2A showing the preferred interconnection between the intermediate plate 140 and the disk drive 130 in the tub 110 .
- the intermediate plate 140 does not make direct contact with the disk drive 130 .
- four upper shock mounts 146 are bonded or otherwise attached to corresponding wells 145 in the intermediate plate 140 .
- the disk drive 130 therefore, is encased and elastomerically supported between the tub 110 and the intermediate plate 140 by the lower shock mounts 126 (see FIG. 2) and the upper shock mounts 146 .
- the main PCBA 150 is secured in the tub 110 above the intermediate plate 140 .
- the main PCBA 150 is secured with two screws (not shown) that pass downward through two apertures—a central aperture 155 and a side aperture 159 .
- the central screw mates with a threaded aperture in the top of a standoff (not shown) that has a threaded fastener that extends from its bottom and is screwed into a threaded boss 147 (see FIG. 2B) in the center of the intermediate plate 140 .
- the side screw mates with a threaded aperture in the top of a similar standoff (also not shown) that screws into a threaded aperture located at one end of a shelf bracket (not shown) that is welded to the second side wall 115 of the tub 110 .
- the other end of the preferred shelf bracket has outwardly extending, vertically spaced fingers (not shown) that surround the top and bottom of the main PCBA 150 and thereby secure it at a third location. It is important, of course, to ground the main PCBA 150 .
- the preferred standoffs are conductive and make contact with corresponding traces that surround the main PCBA's central and side apertures to provide such grounding.
- the main PCBA 150 may be divided into two upper portions and two lower portions.
- the upper left half of the main PCBA 150 carries the CPU and its heat sink 153 .
- the upper right half carries a standard pair of PCM connectors 158 for interfacing the PCBA 150 with any PCM expansion card 160 that may be present.
- the majority left portion of the lower side of the main PCBA 150 rests closely against the intermediate plate 140 via support tabs 142 located to either side thereof and via a conductive standoff located near the plate's center (not shown). This portion of the PCBA's underside may carry some low-profile components, but it does not have any extending components due to its close proximity to the intermediate plate 140 .
- the minority right portion of the main PCBA's underside carries a pair of memory sockets 156 that support a pair of memory modules 157 which extend downwardly therefrom next to the disk drive 130 , in-between the intermediate wall 116 and the second side wall 115 .
- An aperture (not shown) and associated cover plate 158 are provided on the tub's floor wall 111 and aligned with the memory modules 157 to provide access to the modules after the ICM 100 has been assembled.
- the main PCBA 150 is designed so that the CPU and its relatively large heat sink 153 extend upwardly from a topside of the PCBA 150 into an “air tunnel” (not numbered) located between the front and rear cooling apertures 107 , 109 in the front and back walls.
- the ICM's built-in cooling fan 170 moves air through the air tunnel, over the fins of the heat sink 153 , with velocity of greater than 300 linear feet per minute (LFM).
- the cooling fan 170 is preferably located next to the front wall 112 of the tub 110 , next to the front cooling apertures 107 , in order to save some space, but the fan 170 could be located on the opposite side of the tub 110 if desired.
- FIGS. 5 and 6 show two host assemblies 200 A, 200 B. Both assemblies contain a power supply (not shown) for providing power to the host assembly and to the ICM 100 inserted therein.
- the first preferred host assembly 200 A of FIG. 5 contains a CRT display and is configured to appear like a conventional CRT monitor 201 A.
- the second preferred host assembly 200 B of FIG. 6 is configured to appear like a conventional full-height tower chassis 201 B that has a conventional disk drive bay 320 and may be connected to a display, a keyboard, and a mouse (not shown). Other configurations are possible. These two are merely illustrative examples.
- the preferred host assembly provides a docking bay that defines a cavity for receiving an ICM 100 . It is possible, however, to provide a docking module (not shown) that releasably connects an ICM 100 to other devices without providing a cavity 310 per se.
- FIG. 5 host assembly 200 A uses a “built-in” docking bay 300 and associated cavity 310 having keying feature 389 for mating with module keying feature 189 .
- the user inserts the ICM 100 of FIG. 1 into the cavity 310 until the ICM's module connector 154 (see FIG. 3) mates with a host connector 254 (shown in FIG. 7) at the rear of the cavity 310 .
- the FIG. 6 host assembly 200 B uses a “retrofit” docking bay adapter 400 that fits in a standard disk drive bay 320 and defines a cavity 410 having a host connector (not shown) and the keying feature 389 for receiving an ICM 100 .
- the cavity 410 in the retrofit adapter 400 also provides a host connector 254 (shown in FIG. 7) such that the user may insert the ICM 100 into the cavity 410 .
- FIG. 7 is a generalize cutaway view of a built-in docking bay 300 or retrofit adapter 400 according to this invention, the docking bay suitable for use in a host assembly 200 A, 200 B like those illustrated in FIGS. 5 and 6 and configured to receive, electrically mate with, and retain an ICM 100 like the one shown in FIG. 1.
- the docking bay has a cavity 310 defined by a continuous periphery, preferably rectangular, extending from a front opening (not separately numbered) to a back end 313 opposite the front opening.
- the cavity 310 may be regarded as having an insertion axis (arrow) that is perpendicular to the periphery.
- Two items of interest are located at the back end 313 of the cavity 310 : a host connector 254 for mating with the module connector 154 and a projecting member 280 for providing a data security function and an alignment function.
- the host connector 254 is located a particular XY (horizontal and vertical coordinate reference) connector location at the back end 313 of the cavity 310 so that it mates with the ICM's module connector 154 located at the same XY connector location when the ICM 100 is inserted into the cavity 310 .
- the host connector 254 may be centered on the back end 313 of the cavity, but the XY connector location is preferably asymmetric so that, in the absence of a key feature 189 , mating only occurs if the ICM 100 is in the “correct” orientation.
- the projecting member 280 extends into the cavity 310 in parallel with the insertion axis so that it may be received in a corresponding aperture 80 in the rear wall 113 of the ICM 100 .
- the projecting member 280 may be located at an asymmetric XY location at the back end 313 of the cavity to prevent the user from fully inserting an unkeyed ICM 100 into the cavity 310 in the wrong orientation.
- the preferred projecting member 280 is located at the lower right corner of the cavity's back end 313 so that the ICM 100 may conveniently receive it near the ICM's second side 115 (see FIG. 2). Other locations are possible.
- the projecting member 280 will always mate with the aperture 80 in the rear wall 113 of the ICM 100 .
- the projecting member 280 provides a guiding function and a locking function, but it does not impact the ICM 100 because misalignment is not possible.
- FIG. 7A shows the ICM 100 partially inserted into the docking bay 300 , 400 .
- the projecting member 280 extends beyond position “A,” i.e beyond the farthest most point of the host connector 254 . This length ensures that the projecting member 280 contacts the ICM's rear wall 113 before the host connector 254 contacts the rear wall 113 if the ICM is inserted upside down.
- the projecting member 280 also provides an alignment function that is best understood with reference to FIGS. 7 and 7A.
- the preferred projecting member 280 has an annular taper 284 at its tip that slidably mates with the radius edge 81 of the module aperture 80 .
- the radius edge 81 essentially defines an annular beveled recess that guides the module aperture 80 onto the projecting member 280 , and thereby further aligns the overall ICM 100 for mating the module connector 154 to the host connector 254 .
- the projecting member 280 must extend beyond position “A,” however, if it also to provide such an alignment function in cooperation with the module aperture 80 .
- the preferred projecting member 280 extends beyond reference position “A” to a farther reference position “B” to ensure that the module aperture 80 envelopes the projecting member 280 before the module connector 154 begins to mate with the host connector 254 .
- a benefit of this additional length is that ICM 100 contacts the projecting member 280 well before the position that the ICM 100 ordinarily sits when mounted in the bay. Accordingly, the user is given very obvious feedback, both tactile and visual, that the ICM 100 is not corrected situated.
- the preferred connectors 154 , 254 themselves include further complementary alignment features to ensure that a truly “blind” insertion is possible.
- a wide variety of cooperating connector styles may be used, including but not limited to, pin and socket types, card edge types, and spring contact types.
- the inventors contemplate an alternative embodiment of the ICM 100 that is secured to a host assembly in a semi-permanent arrangement.
- the semi-permanent embodiment would omit the sleeve 180 and associated faceplate 181 and would replace the blind mating connector 154 with a more cost effective PCBA edge connector having conductive fingers made plated with minimal amounts of gold.
- FIGS. 7 and 7A also show that the projecting member 280 provides a data integrity feature in connection with the locking mechanism 190 contained inside of the ICM 100 .
- the projecting member 280 in particular, includes a retention notch 282 located on the side thereof.
- the preferred retention notch 282 is provided in the form of an annular groove 282 that encircles the entire projecting member 280 and the preferred locking mechanism 190 includes a moveable pawl 194 that locks the ICM 100 into the docking bay 300 , 400 by engaging the projecting member's annular groove 292 .
- the preferred projecting member 280 is made of a conductive material and is grounded so that it may serve as a means for managing ESD. It is generally desirable to discharge electrostatic energy through a resistance to reduce the magnitude of an associated current spike. Accordingly, the projecting member 280 itself may be comprised of a moderately conductive material such as carbon impregnated plastic or the projecting member 280 may be made of a highly conductive material such as metal and connected to ground through a discharge resistor as shown in FIG. 7A. In either case, the desired resistance is about 1-10 megohms.
- FIGS. 8 - 11 show a presently preferred construction for a “retrofit” docking bay adapter 400 as might be used in the standard drive bay 230 in the host assembly 200 B of FIG. 6.
- the retrofit adapter 400 comprises an adapter sleeve 420 and an adapter PCB 430 that is mounted to a back end of the adapter sleeve.
- the adapter sleeve 420 includes a suitable means for mounting to a standard drive bay 320 such as, for example, a plurality of threaded mounting holes 421 that are sized and spaced to interface with screws and corresponding through holes 321 (see FIG. 6) in a standard 51 ⁇ 4′′ drive bay 320 .
- the preferred adapter sleeve 420 is formed of injection molded plastic. It includes a number of openings 425 , therefore, to reduce the required amount of plastic material.
- the adapter PCB 430 shown from the rear in FIG. 8 and from the side in FIG. 9, carries the host connector 254 , the projecting member 280 , and suitable circuitry 434 for interfacing the adapter PCB 430 to other components in the host adapter.
- FIG. 12 is a side view of a preferred structure for supporting the host connector 254 .
- the host connector 254 is incorporated into the edge of a main host PCB 250 in order to simply the construction and reduce costs.
- FIG. 12 shows such structure in connection with an adapter sleeve 400 , but is probably more applicable for use with a “custom” built-in docking bay 300 as used in a host assembly 200 A like that shown in FIG. 5, where more control can be exercised over the construction of the main host PCB 250 contained in the host assembly 200 A.
Abstract
Description
- 1. Field of the Invention
- The invention relates generally to integrated computer modules and, more specifically, to an integrated computer module of compact construction having an intermediate plate which captures a magnetic disk drive in the module and protects the disk drive from electromagnetic interference.
- 2. Description of the Related Art
- Today's personal computers (PC's) are usually sold in a desktop configuration or a notebook configuration. Desktop PC's are generally housed in a relatively large chassis containing a main printed circuit board or “motherboard” and other components that are incorporated into or connected to the motherboard. The components may be located inside or outside of the chassis. Typical internal components include a power supply, a central processing unit (CPU), random access memory (RAM), a mass storage device such as a magnetic disk drive, expansion cards connected to a bus on the motherboard, and various peripherals mounted on “rails” in “bays” within the chassis and electrically connected to the motherboard or an associated expansion card by a ribbon cable or the like. Typical expansion cards are a SCSI adapter, a sound adapter, and a network adapter. Typical bay-mounted peripherals are a magnetic disk drive, a floppy drive, a tape drive or a CD-ROM drive. Typical external “peripherals” include user input devices such as a keyboard, a mouse, a microphone, a joystick, a graphics tablet or a scanner) and user output devices such as speakers a printer, and a video display device (e.g. a CRT display or an LCD display). The video adapter that controls the display, as with other adapters, may be integrated into the motherboard or provided on a separate expansion card.
- The users of desktop PC's may be divided into two divergent groups: (1) experienced users who understand the individual components and tend to frequently upgrade their PC's by replacing such components, and (2) new users who do not understand or even want to understand the individual components. The latter group may prefer to replace the entire PC, if they upgrade at all. With respect to both groups, however, it has been observed that the need or desire to upgrade occurs far sooner with respect to some components than with respect to other components. In particular, users more frequently upgrade the CPU, the RAM, the magnetic disk drive, and the video adapter. These upgrades tend to provide more capacity and more speed because of rapid technological advancements on the part of manufacturers in response to ever-increasing demands from ever more complicated and more graphics intensive software applications and an associated increase in file sizes. Both user-types less frequently need or desire to upgrade the monitor, the speakers, the keyboard or the power supply, however, because these latter components have withstood the test of time and employ technologies that are less prone to obsolescence.
- These inventors expect that the computer paradigm will move from a large chassis full of individual components of different manufacture toward a readily upgraded system consisting of two primary components: (1) an integrated computer module that compactly houses the frequently upgraded components (e.g. the CPU, the memory, the disk drive, and the video adapter) and provides a module connector for interfacing the module's electronics with peripherals, and (2) a “host assembly” with a docking bay that receives the module and provides a host connector that mates with the module connector. The host assembly can comprise any “shell” that includes the bay that receives the integrated computer module. The docking bay may be in a host assembly that doubles as a peripheral or in an intermediate assembly that is connected to conventional peripherals. The host assembly, for example, may function and appear generally like a conventional CRT display, save for the addition of the docking bay. A CRT-like host assembly of this nature would also provide a first connector for receiving input from a keyboard and, in all likelihood, a second connector for receiving input from a mouse. As another example, the host assembly may appear like a conventional tower chassis that contains a docking bay for receiving the module, and suitable electronics (e.g. a PCB, cables, and so on) to interface the integrated computer module to conventional expansion cards via an expansion bus, and to conventional peripherals like a display, a keyboard, and a mouse, via connector ports built-in to the host assembly or carried by an expansion card.
- There are a number challenges associated with packing computer components and storage capability into a small integrated computer module. One such challenge is attaching the magnetic disk drive within the module in a secure, cost-effective manner. Another challenge is making sure the analog circuitry associated with the magnetic disk drive, which operates at low voltage levels and is very sensitive to EMI, functions properly in the vicinity of the microprocessor which operates at very high power and at very high clock speeds.
- Computer modules and associated bays have already been proposed. For example, in U.S. Pat. No. 5,463,742 that issued to Kobayashi in 1995, assigned to Hitachi, the inventor discloses a “personal processor module” (PPM) that fits within a notebook type docking station or a desktop type docking station, or simply attaches to a docking housing6 that is cabled to a keyboard and a monitor. (See FIG. 1). The '742 Patent discloses an embodiment in FIGS. 10 and 11 where a magnetic disk drive and a PCB which carries a microprocessor are situated in a stacked arrangement. The '742 Patent, however, does not show any particular structure for mounting the magnetic disk drive in the PPM, nor does it teach or suggest using an EMI shield between the magnetic disk drive and the PCB.
- In U.S. Pat. No. 5,550,710 that issued in 1996 to Rahamim et al., also assigned to Hitachi, the inventors also disclose a PPM wherein a disk drive and main PCB are stacked. The '710 Patent, however, focuses on a particular cooling structure for a PPM, and also does not disclose any particular structure for mounting the magnetic disk drive in the PPM or for shielding the drive from EMI emanating fom the main PCB.
- There remains a need, therefore, for an integrated computer module with a simple, rugged mechanism for securing the disk drive in the module and for effectively protecting the analog electronics associated with the disk drive from EMI generated by the microprocessor and associated circuitry.
- In a first aspect, the invention may be regarded as an integrated computer module adapted for removable insertion into a docking bay within a host assembly, and upon such insertion for connecting to a host connector and thereby controlling a display device, the integrated computer module comprising: an enclosure defined by a front wall, a back wall opposite the front wall, a first side wall, a second side wall opposite the first guide wall, a floor wall and a ceiling wall; a main printed circuit board assembly (main PCBA) located in the enclosure, the main PCBA including a microprocessor clocked at high frequency and generating electromagnetic interference (EMI); a module connector electrically connected to the main PCBA and supported at the enclosure's back wall for connection to the host connector upon insertion of the integrated module into the docking bay in the host assembly; a disk drive including a casting and a controller PCBA mounted on one side of the casting, the controller PCBA including integrated circuits that define a hard disk storage control subsystem that operates with relatively low amplitude signals that are subject to distortion from EMI; a conductor assembly electrically connecting the main PCBA to the controller PCBA; and an intermediate plate including a central section, a front edge, a back edge opposite the front edge, a first side edge, and a second side edge opposite the first side edge, the intermediate plate located between the disk drive's controller PCBA and the main PCBA and attached to the enclosure to capture the disk drive in the enclosure and to protect the controller PCBA from EMI generated by the main PCBA. In the preferred embodiment, the main PCBA and the disk drive are located in a stacked arrangement within the enclosure, with the disk drive's controller PCBA facing the main PCBA to reduce the length of the conductor assembly and minimize signal degradation
- The just summarized invention may best be understood with reference to the Figures of which:
- FIG. 1 is a perspective view of an integrated computer module that may be used with a host assembly according to this invention;
- FIG. 2 is an exploded view of the integrated computer module of FIG. 1;
- FIG. 2A shows a partially assembled integrated computer module with emphasis on the intermediate plate and its interconnection to the tub;
- FIG. 2B is an exploded view of the integrated computer module of FIG. 2A;
- FIG. 3 is a rear view of the integrated computer module of FIG. 1;
- FIG. 4 is a section view of FIG. 3 taken along section lines4-4;
- FIG. 5 is a rear perspective view of a host assembly that contains a CRT display and is configured to appear like a conventional CRT monitor;
- FIG. 6 is a front perspective view of a host assembly configured to appear like a conventional tower chassis that may be connected to a monitor, a keyboard, and a mouse (not shown);
- FIG. 7 is a generalize cutaway view of a docking bay according to this invention, suitable for use in a host assembly like those illustrated in FIGS. 5 and 6 and configured to receive, electrically mate with, and retain an integrated computer module like the one shown in FIG. 1;
- FIG. 7A is a cutaway plan view of the integrated computer module partially inserted into a host assembly to illustrate engagement with the projecting member;
- FIG. 8 is an elevational view of an adapter PCB for transforming a standard 5¼″ peripheral bay of a conventional chassis into a docking bay according to this invention;
- FIG. 9 is a side view of the adapter PCB of FIG. 8 and an associated adapter sleeve that is externally sized for insertion into a standard 5¼″ drive bay and is internally sized for receiving an integrated computer module like the one shown in FIG. 1;
- FIG. 10 is a top view of the adapter sleeve of FIG. 9;
- FIG. 11 is a rear view of the adapter sleeve of FIG. 9; and
- FIG. 12 is a side view of a preferred bay configuration (shown here in connection with an adapter sleeve) wherein the host connector is incorporated into the edge of a main host PCB;
- FIG. 1 shows an integrated computer module (ICM)100 that may be used in a host assembly having a docking bay according to this invention. From a structural point of view, the
ICM 100 generally comprises a metal enclosure (not shown in FIG. 1, but see FIG. 2) that may be aesthetically surrounded by a case comprising, for example, asleeve 180 and an associated bezel orfaceplate 181. Thepreferred faceplate 181 includes coolingapertures 186 and ahandle 182 for carrying theICM 100 and for pushing or pulling theICM 100 into or out of a docking bay (not shown in FIG. 1). Thepreferred sleeve 180 includes at least one key feature such aschamfered edge 189 that mates with a corresponding key feature in the docking bay. In the example shown,key feature 189 comprises a chamfered edge along one corner of the substantially rectangular periphery of thesleeve 180 which mates with a corresponding chamfered corner 389 (shown in FIGS. 5,6) of the docking bay. Thesleeve 180 andfaceplate 181 are preferably injection molded components made of any suitable material such as ABS, PVC, or engineered plastics. - The
preferred ICM 100 of FIG. 1 also includes anaperture 184 in thefaceplate 181 for exposing an optional PCI Mezzanine (PCM)card 160 that provides additional functionality such as an ethernet port, a SCSI port, or other desired function. A blank PCM cover plate (not shown) may be located in theaperture 184 in the absence of aPCM card 160. - FIG. 2 is an exploded view of the
ICM 100 of FIG. 1, showing the presently preferred construction in more detail. TheICM 100 is designed so that it can be assembled by hand or more efficiently, and more cost effectively assembled using automated assembly techniques. In particular, the components of thepreferred ICM 100 are generally assembled, from above, into an open-top case or “tub” 110. Thepreferred ICM 100, in other words, is assembled in a successively stacked, layer by layer arrangement. Thetub 110 and all of the components therein are ultimately covered with aceiling wall 119 and then, if appropriate for the desired application, enclosed in thesleeve 180 andfaceplate 181 that form the outer case shown in FIG. 1. Thepreferred ceiling wall 119 makes a snap-on connection to thetub 110 to speed assembly and eliminate the necessity for any threaded fasteners or the like. - The
tub 110 has afloor wall 111, afront wall 112,back wall 113 opposite the front wall, afirst side wall 114, and asecond side wall 115 opposite the first side wall. In order to define a space sized for receiving adisk drive 130, anintermediate wall 116 is also provided between thefirst side wall 114 and thesecond side wall 115. Thetub 100 includes front and rear cooling apertures indicated at 107, 109 in the front and back walls respectively for passage of cooling air. Thetub 110 is designed to minimize leakage of electromagnetic interference (EMI) in accordance with FCC requirements. Accordingly, thetub 110 and associatedceiling wall 119 are metallic and the coolingapertures - The ICM's internal components generally include a
shock mount system 120, adisk drive 130 that is supported in theshock mount system 120 and may have acontroller PCBA 131 mounted on one side thereof, anintermediate plate 140, amain PCBA 150, and an optionalPCM expansion card 160 as mentioned above. Preferably, themain PCBA 150 includes a microprocessor such as an Intel Pentium (not shown) located beneath asuitable heat sink 153, first and secondmemory module connectors 156 for holdingmemory modules 157 of a suitable type and desired capacity (e.g. Single Inline Memory Modules, or Dual Inline Memory Modules), and amodule connector 154 for interfacing theoverall ICM 100 to a host assembly. Collectively, the components mounted on themain PCBA 150 comprise substantially all the circuits needed for a computing subsystem. TheICM 100 further includes alocking mechanism 190 that engages a projecting member (discussed below) in the docking bay. Thepreferred locking mechanism 190 mechanically snaps into a corner of thetub 110 between anupper slot 118 and a lower slot (not shown). - In a final assembly process, the
tub 110 and its interior components are encased in thesleeve 180 and the associatedfaceplate 181. As thefaceplate 181 includes ahandle 182 for carrying the entire ICM, it is important that thefaceplate 181 have a secure, mechanical connection to thetub 110. The presently preferred construction for such a positive, mechanical connection comprises two pairs of backwardly-extendingfingers 187 having inwardly extending detents (not shown), one pair on each side of thefaceplate 181, and two corresponding pairs ofslots 117 on the first andsecond side walls tub 110. As suggested by FIG. 2, thefaceplate 181 is initially pressed onto thetub 110 until the detents on itsfingers 187 engage theslots 117. Next, thetub 110 is inserted into thesleeve 180, thesleeve 180 thereby encasing thetub 110 and thefingers 187 so that they cannot splay outward and disengage from theslots 117. - FIG. 3 shows a rear view of a fully assembled
ICM 100, the side that interfaces with a host assembly having a docking bay as described further below. As shown, substantially all of theback wall 113 is exposed at a rear end of thesleeve 180 to provide access to themodule connector 154, the coolingapertures 109, and amodule aperture 80. - FIG. 4 is a cross-sectional view of the
preferred module aperture 80 in FIG. 3. In particular, FIG. 4 shows that thepreferred module aperture 80 has radius edges 81 having a depth “D” that is greater than a width “W” of anannular groove 282 contained in a projectingmember 280. We make “D” greater than “W” to ensure that themodule aperture 80 does not accidentally hang up on the projectingmember 280 as described more fully below in connection with the locking mechanism and the host assembly. Thepreferred module aperture 80 is formed by stamping or punching through theback wall 113. - Referring once more to FIG. 2, the preferred
shock mount system 120 comprises fourcorner pieces 126 and fourbuttons 146 that are each formed from an elastomeric material, the preferred material being Sorbathane sold by Sorbathane, Inc. Thecorner pieces 126 each have a base and two intersecting, substantially perpendicular walls (not separately numbered) extending upwardly from the base (not separately numbered). During assembly, thecorner pieces 126 are simply located with their bases on thefloor wall 111 of thetub 110, and with their upstanding walls in the corners defined by thefront wall 112, theback wall 113, thefirst side wall 114, and theintermediate wall 116. The upstanding walls of thecorner pieces 126 are sized to provide a firm press fit relationship when compressed between thedisk drive 130 and the surroundingwalls button 146 are placed in wells (not shown) formed in theintermediate plate 140 to capture an opposite side of thedisk drive 130 as described further below. - The presently preferred
shock mounting system 120 requires us to orient thedisk drive 130 with itscontroller board 131 facing upward, i.e. in a “board-up” orientation. The board-up orientation is preferred because it places thecontroller board 131 as close as possible to themain PCBA 150, thereby allowing a short cable with minimal signal degradation. A short cable is not especially important in the context of an IDE connection to the disk drive. Because of ever increasing CPU power, however, the CPU may control the disk drive via an ordinary expansion bus such as the PCI bus. A short cable is critical in the context of a PCI connection to a disk drive. The board-up orientation is also preferred because the shock mounts 126 will not block access to theconnectors 132 that are on thecontroller board 131. It is also desirable to mount thedisk drive 130 board-up because the other side of the disk drive presents a clean, solid volume for contact with theshock mount system 120. - The
disk drive 130, therefore, is oriented board side up and then pressed down onto and in between the four corner pieces. Next, theintermediate plate 140 is snapped into thetub 110, between thefirst side wall 114 and anintermediate wall 116, to firmly hold thedisk drive 130 downward on thecorner pieces 126. Note that thecontroller board 131 is recessed into the disk drive's aluminum casting 132, leaving a pair of elongated casting rails 133 extending up above theboard 131. The upper shock mounts (elastomeric buttons) 146 are bonded to theintermediate plate 140. Thebuttons 146 press down against theelongated rails 133 of the casting 132. Consequently, thebuttons 146 isolate theintermediate plate 140 from therails 133, thereby enabling theshock mount system 120 to mechanically couple thedisk drive 130 to thetub 110 via a shock-isolating, elastomeric interface. - The
intermediate plate 140 also protects the disk drive'scontroller board 131 from electromagnetic interference (EMI) emanating from themain PCBA 150. Themain PCBA 150 transmits significant amounts of RF energy over a wide frequency spectrum because it has synchronously clocked components that operate at relatively high power levels (e.g. greater than 5 watts) and at a plurality of relatively high clock frequencies (e.g. 66 MHz, 100 MHz, 500 MHz, and so on). The disk drive'scontroller PCBA 131, on the other hand, contains circuitry that operates at relatively low millivolt levels that are associated with reading and writing data to and from thedisk drive 130. Theintermediate plate 140, therefore, beneficially functions as an EMI shield in addition to securing thedisk drive 130 in thetub 110. Thepreferred plate 140 is made of the same metallic material as the remainder of thetub 110 so that it represents an intermediate ground plane that tends to arrest conducted and radiated RF energy. - FIG. 2A shows the
intermediate plate 140 and its interconnection to thetub 110 in more detail. As shown therein, theintermediate plate 140 has a central section, a front edge, a back edge opposite the front edge, a first side edge, and a second side edge opposite the first side edge. The preferredintermediate plate 140 has a pair oftabs 141 on its first side edge which interface with a corresponding pair of slots (not numbered) in thefirst side wall 114. The second side of the plate includes a pair of downwardly-extendingfingers 143 that mate with one side of theintermediate wall 116 and anelongated lip 144 that mates with an opposite side of theintermediate wall 116. The downwardly-extendingfingers 143 have detents (see FIG. 2B) which mate with slots (not shown) in theintermediate wall 116. - FIG. 2B is an exploded view of FIG. 2A showing the preferred interconnection between the
intermediate plate 140 and thedisk drive 130 in thetub 110. As shown, theintermediate plate 140 does not make direct contact with thedisk drive 130. Instead, four upper shock mounts 146 are bonded or otherwise attached to correspondingwells 145 in theintermediate plate 140. Thedisk drive 130, therefore, is encased and elastomerically supported between thetub 110 and theintermediate plate 140 by the lower shock mounts 126 (see FIG. 2) and the upper shock mounts 146. - As best shown in FIG. 2, the
main PCBA 150 is secured in thetub 110 above theintermediate plate 140. In the presently preferred embodiment, themain PCBA 150 is secured with two screws (not shown) that pass downward through two apertures—acentral aperture 155 and aside aperture 159. The central screw mates with a threaded aperture in the top of a standoff (not shown) that has a threaded fastener that extends from its bottom and is screwed into a threaded boss 147 (see FIG. 2B) in the center of theintermediate plate 140. The side screw mates with a threaded aperture in the top of a similar standoff (also not shown) that screws into a threaded aperture located at one end of a shelf bracket (not shown) that is welded to thesecond side wall 115 of thetub 110. The other end of the preferred shelf bracket has outwardly extending, vertically spaced fingers (not shown) that surround the top and bottom of themain PCBA 150 and thereby secure it at a third location. It is important, of course, to ground themain PCBA 150. The preferred standoffs are conductive and make contact with corresponding traces that surround the main PCBA's central and side apertures to provide such grounding. - The
main PCBA 150 may be divided into two upper portions and two lower portions. The upper left half of themain PCBA 150 carries the CPU and itsheat sink 153. The upper right half carries a standard pair ofPCM connectors 158 for interfacing thePCBA 150 with anyPCM expansion card 160 that may be present. The majority left portion of the lower side of themain PCBA 150 rests closely against theintermediate plate 140 viasupport tabs 142 located to either side thereof and via a conductive standoff located near the plate's center (not shown). This portion of the PCBA's underside may carry some low-profile components, but it does not have any extending components due to its close proximity to theintermediate plate 140. The minority right portion of the main PCBA's underside, however, carries a pair ofmemory sockets 156 that support a pair ofmemory modules 157 which extend downwardly therefrom next to thedisk drive 130, in-between theintermediate wall 116 and thesecond side wall 115. An aperture (not shown) and associatedcover plate 158 are provided on the tub'sfloor wall 111 and aligned with thememory modules 157 to provide access to the modules after theICM 100 has been assembled. - It is important to provide highly efficient cooling because of the high power dissipation and component density in the relatively low volume of the
ICM 100. Modern CPUs dissipate a significant amount of heat. For example, an Intel Pentium III processor operating at 500 MHz with a 512K L2 cache dissipates about 28 watts. The safe dissipation of this much heat requires a large, highlyefficient heat sink 153, the preferred heat sink being fabricated from aluminum because aluminum offers a good compromise between heat dissipation and cost. Themain PCBA 150 is designed so that the CPU and its relativelylarge heat sink 153 extend upwardly from a topside of thePCBA 150 into an “air tunnel” (not numbered) located between the front andrear cooling apertures cooling fan 170 moves air through the air tunnel, over the fins of theheat sink 153, with velocity of greater than 300 linear feet per minute (LFM). The coolingfan 170 is preferably located next to thefront wall 112 of thetub 110, next to thefront cooling apertures 107, in order to save some space, but thefan 170 could be located on the opposite side of thetub 110 if desired. - FIGS. 5 and 6 show two
host assemblies ICM 100 inserted therein. The firstpreferred host assembly 200A of FIG. 5 contains a CRT display and is configured to appear like aconventional CRT monitor 201A. The secondpreferred host assembly 200B of FIG. 6 is configured to appear like a conventional full-height tower chassis 201B that has a conventionaldisk drive bay 320 and may be connected to a display, a keyboard, and a mouse (not shown). Other configurations are possible. These two are merely illustrative examples. - The preferred host assembly provides a docking bay that defines a cavity for receiving an
ICM 100. It is possible, however, to provide a docking module (not shown) that releasably connects anICM 100 to other devices without providing acavity 310 per se. - The FIG. 5
host assembly 200A uses a “built-in”docking bay 300 and associatedcavity 310 having keying feature 389 for mating withmodule keying feature 189. In operation, the user inserts theICM 100 of FIG. 1 into thecavity 310 until the ICM's module connector 154 (see FIG. 3) mates with a host connector 254 (shown in FIG. 7) at the rear of thecavity 310. - The FIG. 6
host assembly 200B, on the other hand, uses a “retrofit”docking bay adapter 400 that fits in a standarddisk drive bay 320 and defines acavity 410 having a host connector (not shown) and thekeying feature 389 for receiving anICM 100. Thecavity 410 in theretrofit adapter 400 also provides a host connector 254 (shown in FIG. 7) such that the user may insert theICM 100 into thecavity 410. - FIG. 7 is a generalize cutaway view of a built-in
docking bay 300 orretrofit adapter 400 according to this invention, the docking bay suitable for use in ahost assembly ICM 100 like the one shown in FIG. 1. - The docking bay has a
cavity 310 defined by a continuous periphery, preferably rectangular, extending from a front opening (not separately numbered) to aback end 313 opposite the front opening. Thecavity 310 may be regarded as having an insertion axis (arrow) that is perpendicular to the periphery. Two items of interest are located at theback end 313 of the cavity 310: ahost connector 254 for mating with themodule connector 154 and a projectingmember 280 for providing a data security function and an alignment function. - The
host connector 254 is located a particular XY (horizontal and vertical coordinate reference) connector location at theback end 313 of thecavity 310 so that it mates with the ICM'smodule connector 154 located at the same XY connector location when theICM 100 is inserted into thecavity 310. Thehost connector 254 may be centered on theback end 313 of the cavity, but the XY connector location is preferably asymmetric so that, in the absence of akey feature 189, mating only occurs if theICM 100 is in the “correct” orientation. - The projecting
member 280 extends into thecavity 310 in parallel with the insertion axis so that it may be received in a correspondingaperture 80 in therear wall 113 of theICM 100. The projectingmember 280 may be located at an asymmetric XY location at theback end 313 of the cavity to prevent the user from fully inserting anunkeyed ICM 100 into thecavity 310 in the wrong orientation. In either case, the preferred projectingmember 280 is located at the lower right corner of the cavity'sback end 313 so that theICM 100 may conveniently receive it near the ICM's second side 115 (see FIG. 2). Other locations are possible. - If the
ICM 100 anddocking bay member 280 will always mate with theaperture 80 in therear wall 113 of theICM 100. In this preferred embodiment, the projectingmember 280 provides a guiding function and a locking function, but it does not impact theICM 100 because misalignment is not possible. - In the case of an
un-keyed ICM 100, however, alignment is not assured. If theun-keyed ICM 100 is inserted in the correct orientation where theconnectors member 280 is simply received by themodule aperture 80 in therear wall 113 of the ICM's tub 110 (see FIG. 2). If theun-keyed ICM 100 is inserted upside down, however, then a solid portion of therear wall 113 will contact the projectingmember 280 before the ICM'srear wall 113 contacts and potentially damages thehost connector 254 and before the cavity'srear end 313 contacts and potentially damages themodule connector 154. - FIG. 7A shows the
ICM 100 partially inserted into thedocking bay member 280 extends beyond position “A,” i.e beyond the farthest most point of thehost connector 254. This length ensures that the projectingmember 280 contacts the ICM'srear wall 113 before thehost connector 254 contacts therear wall 113 if the ICM is inserted upside down. - The projecting
member 280 also provides an alignment function that is best understood with reference to FIGS. 7 and 7A. As shown, the preferred projectingmember 280 has anannular taper 284 at its tip that slidably mates with theradius edge 81 of themodule aperture 80. Theradius edge 81 essentially defines an annular beveled recess that guides themodule aperture 80 onto the projectingmember 280, and thereby further aligns theoverall ICM 100 for mating themodule connector 154 to thehost connector 254. The projectingmember 280 must extend beyond position “A,” however, if it also to provide such an alignment function in cooperation with themodule aperture 80. As shown, in fact, the preferred projectingmember 280 extends beyond reference position “A” to a farther reference position “B” to ensure that themodule aperture 80 envelopes the projectingmember 280 before themodule connector 154 begins to mate with thehost connector 254. A benefit of this additional length is thatICM 100 contacts the projectingmember 280 well before the position that theICM 100 ordinarily sits when mounted in the bay. Accordingly, the user is given very obvious feedback, both tactile and visual, that theICM 100 is not corrected situated. - Suitably, the
preferred connectors - Although not shown, the inventors contemplate an alternative embodiment of the
ICM 100 that is secured to a host assembly in a semi-permanent arrangement. For cost reasons, the semi-permanent embodiment would omit thesleeve 180 and associatedfaceplate 181 and would replace theblind mating connector 154 with a more cost effective PCBA edge connector having conductive fingers made plated with minimal amounts of gold. - FIGS. 7 and 7A also show that the projecting
member 280 provides a data integrity feature in connection with thelocking mechanism 190 contained inside of theICM 100. The projectingmember 280, in particular, includes aretention notch 282 located on the side thereof. Thepreferred retention notch 282 is provided in the form of anannular groove 282 that encircles the entire projectingmember 280 and thepreferred locking mechanism 190 includes amoveable pawl 194 that locks theICM 100 into thedocking bay - The preferred projecting
member 280 is made of a conductive material and is grounded so that it may serve as a means for managing ESD. It is generally desirable to discharge electrostatic energy through a resistance to reduce the magnitude of an associated current spike. Accordingly, the projectingmember 280 itself may be comprised of a moderately conductive material such as carbon impregnated plastic or the projectingmember 280 may be made of a highly conductive material such as metal and connected to ground through a discharge resistor as shown in FIG. 7A. In either case, the desired resistance is about 1-10 megohms. - FIGS.8-11 show a presently preferred construction for a “retrofit”
docking bay adapter 400 as might be used in the standard drive bay 230 in thehost assembly 200B of FIG. 6. As shown, theretrofit adapter 400 comprises anadapter sleeve 420 and anadapter PCB 430 that is mounted to a back end of the adapter sleeve. Theadapter sleeve 420 includes a suitable means for mounting to astandard drive bay 320 such as, for example, a plurality of threaded mountingholes 421 that are sized and spaced to interface with screws and corresponding through holes 321 (see FIG. 6) in a standard 5¼″drive bay 320. Thepreferred adapter sleeve 420 is formed of injection molded plastic. It includes a number ofopenings 425, therefore, to reduce the required amount of plastic material. - The
adapter PCB 430, shown from the rear in FIG. 8 and from the side in FIG. 9, carries thehost connector 254, the projectingmember 280, andsuitable circuitry 434 for interfacing theadapter PCB 430 to other components in the host adapter. - FIG. 12 is a side view of a preferred structure for supporting the
host connector 254. Here, instead of being supported on aseparate PCB 430 as in FIGS. 8 and 9, thehost connector 254 is incorporated into the edge of amain host PCB 250 in order to simply the construction and reduce costs. FIG. 12 shows such structure in connection with anadapter sleeve 400, but is probably more applicable for use with a “custom” built-indocking bay 300 as used in ahost assembly 200A like that shown in FIG. 5, where more control can be exercised over the construction of themain host PCB 250 contained in thehost assembly 200A.
Claims (13)
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US09/283,931 US6411522B1 (en) | 1999-04-01 | 1999-04-01 | Integrated computer module with EMI shielding plate |
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US09/283,931 US6411522B1 (en) | 1999-04-01 | 1999-04-01 | Integrated computer module with EMI shielding plate |
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US6411522B1 US6411522B1 (en) | 2002-06-25 |
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- 1999-04-01 US US09/283,931 patent/US6411522B1/en not_active Expired - Lifetime
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