EP0124312A2 - Resistor structures for thermal ink jet printers - Google Patents
Resistor structures for thermal ink jet printers Download PDFInfo
- Publication number
- EP0124312A2 EP0124312A2 EP84302524A EP84302524A EP0124312A2 EP 0124312 A2 EP0124312 A2 EP 0124312A2 EP 84302524 A EP84302524 A EP 84302524A EP 84302524 A EP84302524 A EP 84302524A EP 0124312 A2 EP0124312 A2 EP 0124312A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistive
- ink
- resistor
- ink jet
- orifice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14032—Structure of the pressure chamber
- B41J2/14056—Plural heating elements per ink chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14088—Structure of heating means
- B41J2/14112—Resistive element
- B41J2/14129—Layer structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14387—Front shooter
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
- This invention is concerned with resistor structures for thermal ink jet printers.
- The rapidity of modern-day data processing imposes severe demands on the ability to produce a printout record at very high speed. Impact printing, in which permanently shaped character elements physically contact a recording medium, are proving to be too slow and too bulky for many applications. Thus, the industry has turned to other alternatives involving non-impact printing schemes using various techniques to cause a desired character to be formed on the recording medium. Some of these involve the use of electrostatic or magnetic fields to control the deposition of a visible character-forming substance, either solid (i.e., dry powder) or liquid (i.e., ink) on the medium, which is usually paper. Other systems utilize electrophotographic or ionic systems in which an electron or ion beam impinges on the medium and causes a change in coloration at the point of impingement. Still another system employs a thermal image to achieve the desired shape coloration change. Of more recent import is a printing technique, called ink jet printing, in which tiny droplets of ink are electronically caused to impinge on a recording medium to form any selected character at any location at very high speed. Ink jet printing is a non-contact system which requires no specially treated recording media, ordinary plain paper being suitable, and which requires no vacuum equipment or bulky mechanisms. The present invention relates to this kind of printing system.
- Ink jet systems may be classified as follows: (1) continuous, in which ink droplets are continuously ejected out from a nozzle at a constant rate under constant ink pressure; (2) electrostatic, in which an electrostatically charged ink jet is impelled by controllable electrostatic fields; and (3) impulse, or ink-on-demand, in which ink droplets are impelled on demand from a nozzle by a controllable mechanical force. The invention is concerned with a nozzle head for this latter type of system.
- Typical of the ink-on-demand systems is the approach set forth in U.S. Patent Specification no. 3.832,579. Here a cylindrical piezoelectric transducer is tightly bound to the outer surface of a cylindrical nozzle. Ink is delivered to the nozzle by means of a hose connected between one end of the nozzle and an ink reservoir. As the piezoelectric transducer receives an electrical impulse, it squeezes the nozzle which in turn generates a pressure wave resulting in the acceleration of the ink toward both ends of the nozzle. An ink droplet is formed when the ink pressure wave exceeds the surface tension of the meniscus at the orifice on the small end of the nozzle.
- Another type of ink-on-demand printing is described in U.S. Patent Specification no. 3,174,042. This system utilizes a number of ink-containing tubes, electric current being passed through the ink itself. Because of the high resistance of the ink, it is heated so that a portion thereof is vaporized in the tubes causing ink and ink vapor to be expelled from the tubes.
- In the specification of our co-pending UK patent application no. 8217720 an ink-on-demand printing system is described which utilizes an ink-containing capillary having an orifice from which ink is ejected. Located closely adjacent to this orifice is an ink-heating mechanism which may be a resistor located either within or adjacent to the capillary. Upon the application of a suitable current to the resistor, it is rapidly heated. A significant amount of thermal energy is transferred to the ink resulting in vaporization of a small portion of the ink adjacent the orifice and producing a bubble in the capillary. The formation of this bubble in turn creates a pressure wave which propels a single ink droplet from the orifice onto a nearby writing surface or recording medium. By properly selecting the location of the ink-heating mechanism with respect to the orifice and with careful control of the energy transfer from the heating mechanism to the ink, the ink bubble will quickly collapse on or near the ink-heating mechanism before any vapor escapes from the orifice.
- It will be appreciated that the lifetime of thermal ink jet printers is dependent upon resistor lifetime. It has been found that a majority of resistor failures is due to cavitation damage which occurs during bubble collapse. Hence it is desirable that resistor wear due to cavitation damage should be minimized as much as possible. In the specification of our co-pending EPO application no. 83304152.8 the resistive element is provided with a central "cold" spot formed of a conductive material, it being assumed that most of the bubble damage occurs at or near the center of the resistor. The cold spot causes the formation of a toroidal bubble which upon collapse is randomly distributed across the resistor surface instead of being concentrated in a small central area of the resistor.
- The cold spot is actually formed by means of a gold deposition in the center of the resistive element. The gold spot thus effectively serves to short out the resistor or the resistive portion beneath it, thus preventing heat from being generated in that area. It will be appreciated that with this cold central spot, the heating of the ink immediately thereabove will be non-uniform which may not be efficacious for optimum bubble formation. Nor is it at all sure that the bubble collapse will not also occur in the central area of the resistive element albeit being separated from the resistive material by the gold spot in the center thereof. Should this occur, erosion of the gold spot or layer may result eventually causing resistor failure.
- The present invention provides a resistive heater for use in thermal ink jet printers of the type having discrete ink-ejecting nozzles associated with discrete heaters, said heater being characterized by (a) a pair of resistive elements spaced apart from each other and adjacent to one of said ink-ejecting nozzles, and (b) electrically conductive means connecting said resistive elements in series with each other.
- The resistive elements are preferably two-dimensional thin films.
- Preferably each of said resistive elements has a sheet resistance which is multiple of the resistance of a single square.
- The preferred embodiment of the present invention provides a resistive area in the form of two resistive legs, having an open central portion extending therebetween. Thus the collapse of the bubble in the central portion of the resistive area will not act upon the resistive material in either of the resistive legs. Furthermore, by making each resistive leg constitute two squares, the resistance of each leg will be doubled or twice the resistance of a single square of resistance material as practiced heretofore in the art of thermal ink jet printers. Thus, for example, whereas a single square of resistive material in prior thermal ink jet printers may have provided a resistance of 50 ohms per square, each leg of the resistive structure according to the present invention, will provide 100 ohms per square for a total resistance of 200 ohms.
- Thus, the present invention not only enhances resistor lifetime by eliminating bubble collapse/cavitation damage in the center of the thin film resistive area, but also reduces power losses in the conductors leading to the resistors by using lower operating currents. The reduced current requirements also enhances the overall reliability of the thermal ink jet printhead.
- There now follows a detailed description, which is to be read with reference to the accompanying drawings, of a resistive heater according to the present invention; it is to be clearly understood that this resistive heater has been selected for description to illustrate the invention by way of example and not by way of limitation.
- In the accompanying drawings:-
- Figure 1 is a perspective view, partly in section, of a portion of thermal ink jet printhead showing a single orifice (nozzle) with its associated resistor;
- Figure 2 is a planned view of an array of resistor structures as if taken along Line A-A in Figure 1 and continued;
- Figure 3 is a perspective view, partly in section, of the resistor-conductor structure according to the invention;
- Figure 4 is a plan view of the resistor-conductor structure according to another embodiment of the invention and including barrier members associated with the resistor-conductor structure;
- Figure 5 is a side view in section of the resistor structure according to the invention and shows the position of an ink bubble as it begins to collapse;
- Figure 6-A is a plan view of a resistor conductor structure useful in explaining the advantages and operation of the resistor conductor structure of the present invention; and
- Figure 6-B is a plan view of the resistor structure according to the present invention for use in explaining the operation of the invention with reference to Figure 6-A.
- Referring now to the drawings, and to Figure 1 in particular, there is shown a portion of a typical printhead structure for a single orifice. The principal support structure is a
substrate 2 of single crystalline silicon. Disposed on the upper surface of thesilicon substrate 2 is a thermally insulatinglayer 4 of silicon dioxide which may typically be 3.5 microns in thickness. Formed on the upper surface of thesilicon dioxide layer 4 is aresistive element 8 formed of tantalum and aluminium, for example. Likewise, disposed on thesilicon dioxide layer 4 are conductor elements or strips, 10 and 10', which may be of aluminium or of an alloy of aluminium and copper. The conductors overlay theresistive element 8 except where it is desired to have resistive heating occur. The next structure disposed over theresistive element 8 and itsassociated conductors 10 and 10' may be apassivation layer 12 of silicon carbide, for example, of from 0.5 to 2.5 microns in thickness. - Disposed on the upper surface of the
silicon carbide layer 12 arebarrier elements underlying resistor element 8. As shown in Figure 2, these barrier structures may surround each resistive element on three sides. Thebarriers barriers orifice plate 18 in position on the upper surface of the printhead assembly. In addition, the materials used can withstand temperatures as high as 300oC. - The
orifice plate 18 may be formed of nickel. As shown, theorifice 20 itself is disposed immediately above and in line with its associatedresistive element 8. While only a single orifice has been shown, it will be understood that the complete printhead may comprise an array of orifices each having respective underlying - resistive elements and conductors to permit the selective ejection of a droplet of ink from any particular orifice. With particular reference to Figure 2, it will be appreciated that thebarriers orifice plate 20 above the passivation layer 12B permitting ink to flow in this space and between the barriers so as to be available in each orifice and over and above respectiveresistive elements barriers resistive areas - Upon energizing of the
resistive element 8, the thermal energy developed thereby is transmitted through thepassivation layer 12 to heat and vaporize a portion of a quantity of theink 22 disposed in theorifice 20 and immediately above theresistive element 8. The vaporization of theink 22 eventually results in the expulsion of adroplet 221 of ink which impinges upon an immediately adjacent recording medium (not shown). The bubble of ink vapor formed during the heating and vaporization thereof then collapses back onto the area immediately above theresistive element 8. Theresistor 8 is protected from any deleterious effects due to collapse of the ink bubble by means of the passivation layers 12. Thesilicon carbide layer 12, being the layer in immediate contact with the ink, provides protection to the underlying materials due to its extreme hardness and resistance to cavitation. - In fabricating the printhead structure according to the invention, it will be appreciated that the particular geometry of any particular element or layer may be achieved by techniques well known in the art of film deposition and formation. These techniques involve the utilization of photo-resists and etching procedures to expose desired areas of the layer or structure where an element is to be formed followed by the deposition of the material of which the particular element is to be formed. These processes for forming the various layers and elements of the printhead assembly are well known in the art and will not be described in greater detail herein.
- Referring now to Figures 3 and 4, a somewhat simplified view of a resistive structure according to the present invention is shown. It will be appreciated that the passivation layer as well as the orifice plate have been omitted from the structure shown in these Figures in order to permit a better showing and explanation of the novel resistive structure of the invention. As described hereinbefore, the
resistive structures silicon dioxide layer 4 formed on thesilicon substrate 2. Instead of a single resistive element, a pair ofresistive elements 8', 8" are provided in the area previously occupied by the singleresistive element 8. This split resistive structure comprises two rectangular regions orlegs 8' and 8" each being about 2 x 4 mils and spaced from each other by about .6 mil, for example. Electrical energy to produce heating is supplied to theresistive elements conductors 10' and 10", each contacting corresponding respective end portions of the two resistive elements. The circuit connections for these resistive elements is completed by thecommon conductor 10 which contacts the opposite ends of theresistive elements 8' and 8". It will also be appreciated that in actual practice, a passivation layer (not shown) may be applied over the surface of the structure shown in Figures 3 and 4. - As seen in Figure 5, with this split resistive structure the collapsing
ink bubble 22", formed above theresistive elements 8' and 8", will act upon the non-resistive area lying between the resistive elements, thus minimizing or avoiding altogether any damage to these resistive ele m ents. - Figure 6A depicts the typical geometry of a
resistive element 8 according to the prior art. As shown, theresistive element 8, mounted on a base b, is provided withconductors 10, 10' contacting opposed ends of the element. In addition, it will be noted that the resistive element is a square (typically 4 mils on a side). Thus the sheet resistance of theresistive element 8 as shown in Figure 6A may be 50 ohms per square. In Figure 6B the resistive structure according to the present invention is shown wherein each resistor element or leg, 8' and 8", may be about 3 mils x 1.5 mils. It will thus be appreciated that each leg comprises two squares about 1.5 x 1.5 mils. Since the sheet resistance of one square is about 50 ohms, it will be understood that each leg now has a resistivity of 100 ohms while the total resistive structure, comprising both legs, provides a resistivity of 200 ohms. Since the total resistance is now four times that of a single square, considerably lower operating current is required in order to achieve the same degree of heating. For example the prior art arrangement comprising a single resistor element of about 50 ohms required about 400 ma to achieve the necessary heat to generate a mature bubble and droplet. The resistive structure, according to the present invention comprising four squares of 50 ohms per square each, reduces the required operating current to about 200 ma. This means that the power loss in the conductors typically may now be only about five percent. - Thus the resistive structure according to the present invention not only reduces or eliminates damage to the resistive structure itself, but that structure also provides the opportunity to substantially decrease the operating current for the resistive structure. Thus, both the geometry of the resistive structure and the reduced current requirements attainable with this structure enhance the overall reliability and lifetime of the resistive structure.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49010483A | 1983-04-29 | 1983-04-29 | |
US490104 | 1983-04-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0124312A2 true EP0124312A2 (en) | 1984-11-07 |
EP0124312A3 EP0124312A3 (en) | 1985-08-28 |
Family
ID=23946648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84302524A Withdrawn EP0124312A3 (en) | 1983-04-29 | 1984-04-13 | Resistor structures for thermal ink jet printers |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0124312A3 (en) |
JP (1) | JPS59207262A (en) |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0244643A2 (en) * | 1986-05-08 | 1987-11-11 | Hewlett-Packard Company | Process for manufacturing thermal ink jet printheads and structures produced thereby |
GB2206082A (en) * | 1987-06-17 | 1988-12-29 | Alcatel Business Systems | Franking machine incorporating ink-jet printer and microprocessor for accounting and control |
US4870433A (en) * | 1988-07-28 | 1989-09-26 | International Business Machines Corporation | Thermal drop-on-demand ink jet print head |
EP0396315A1 (en) * | 1989-05-01 | 1990-11-07 | Xerox Corporation | Thermal ink jet printhead with bubble generating heating elements |
EP0514706A2 (en) * | 1991-05-24 | 1992-11-25 | Hewlett-Packard Company | Process for manufacturing thermal ink jet printheads having metal substrates and printheads manufactured thereby |
EP0534495A1 (en) * | 1988-06-03 | 1993-03-31 | Canon Kabushiki Kaisha | Liquid emission recording head, substrate therefor and liquid emission recording apparatus utilizing said head |
EP0638424A2 (en) * | 1993-08-09 | 1995-02-15 | Hewlett-Packard Company | Thermal ink jet printhead and method of manufacture |
EP0707963A3 (en) * | 1994-10-20 | 1997-03-12 | Canon Kk | Ink jet head, ink jet head cartridge and ink jet apparatus |
EP0707964A3 (en) * | 1994-10-20 | 1997-03-19 | Canon Kk | Liquid jet head, head cartridge, liquid jet apparatus, method of ejecting liquid, and method of injecting ink |
EP0775580A3 (en) * | 1995-11-27 | 1997-10-22 | Samsung Electronics Co Ltd | Print head for bubble jet printer |
EP0803361A2 (en) * | 1996-04-22 | 1997-10-29 | Canon Kabushiki Kaisha | Ink-jet head, ink-jet cartridge, and ink jet recording apparatus |
EP0855277A2 (en) * | 1997-01-24 | 1998-07-29 | Lexmark International, Inc. | Ink jet printhead for dropsize modulation |
US6070969A (en) * | 1994-03-23 | 2000-06-06 | Hewlett-Packard Company | Thermal inkjet printhead having a preferred nucleation site |
US6139131A (en) * | 1999-08-30 | 2000-10-31 | Hewlett-Packard Company | High drop generator density printhead |
EP1080905A1 (en) * | 1999-08-30 | 2001-03-07 | Hewlett-Packard Company | Segmented resistor inkjet drop generator with current crowding reduction |
US6276775B1 (en) | 1999-04-29 | 2001-08-21 | Hewlett-Packard Company | Variable drop mass inkjet drop generator |
US6290336B1 (en) | 1999-08-30 | 2001-09-18 | Hewlett-Packard Company | Segmented resistor drop generator for inkjet printing |
US6310639B1 (en) | 1996-02-07 | 2001-10-30 | Hewlett-Packard Co. | Printer printhead |
US6309052B1 (en) * | 1999-04-30 | 2001-10-30 | Hewlett-Packard Company | High thermal efficiency ink jet printhead |
US6318847B1 (en) | 2000-03-31 | 2001-11-20 | Hewlett-Packard Company | Segmented heater resistor for producing a variable ink drop volume in an inkjet drop generator |
US6485128B1 (en) | 1996-03-04 | 2002-11-26 | Hewlett-Packard Company | Ink jet pen with a heater element having a contoured surface |
US6491377B1 (en) | 1999-08-30 | 2002-12-10 | Hewlett-Packard Company | High print quality printhead |
US6711806B2 (en) | 2001-05-14 | 2004-03-30 | Hewlett-Packard Development Company, L.P. | Method of manufacturing a thermal fluid jetting apparatus |
EP1447222A1 (en) * | 2003-01-15 | 2004-08-18 | Samsung Electronics Co., Ltd. | Ink-jet printhead |
US7431430B2 (en) * | 2002-10-08 | 2008-10-07 | Sony Corporation | Liquid ejecting head having selectively controlled heat-energy evolving element regions |
US10166778B2 (en) | 2015-04-10 | 2019-01-01 | Hewlett-Packard Development Company, L.P. | Removing segment of a metal conductor while forming printheads |
CN109562625A (en) * | 2016-08-16 | 2019-04-02 | 斑马技术公司 | Print scalp acupuncture configuration |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0698753B2 (en) * | 1984-10-23 | 1994-12-07 | セイコーエプソン株式会社 | Inkjet recording device |
US4746935A (en) * | 1985-11-22 | 1988-05-24 | Hewlett-Packard Company | Multitone ink jet printer and method of operation |
KR100413677B1 (en) | 2000-07-24 | 2003-12-31 | 삼성전자주식회사 | Bubble-jet type ink-jet printhead |
JP2006088711A (en) * | 2002-04-16 | 2006-04-06 | Sony Corp | Liquid ejecting device and liquid ejecting method |
Citations (1)
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US4317124A (en) * | 1979-02-14 | 1982-02-23 | Canon Kabushiki Kaisha | Ink jet recording apparatus |
Family Cites Families (4)
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JPS5559976A (en) * | 1978-10-31 | 1980-05-06 | Canon Inc | Liquid injection recorder |
JPS5931940B2 (en) * | 1979-02-19 | 1984-08-06 | キヤノン株式会社 | Droplet jet recording device |
JPS588660A (en) * | 1981-07-09 | 1983-01-18 | Canon Inc | Liquid jet type recording head |
JPS59124865A (en) * | 1982-12-29 | 1984-07-19 | Canon Inc | Liquid jetting recorder |
-
1984
- 1984-04-13 EP EP84302524A patent/EP0124312A3/en not_active Withdrawn
- 1984-04-20 JP JP8002184A patent/JPS59207262A/en active Granted
Patent Citations (1)
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US4317124A (en) * | 1979-02-14 | 1982-02-23 | Canon Kabushiki Kaisha | Ink jet recording apparatus |
Cited By (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0244643A3 (en) * | 1986-05-08 | 1988-09-28 | Hewlett-Packard Company | Process for manufacturing thermal ink jet printheads and structures produced thereby |
EP0244643A2 (en) * | 1986-05-08 | 1987-11-11 | Hewlett-Packard Company | Process for manufacturing thermal ink jet printheads and structures produced thereby |
GB2206082A (en) * | 1987-06-17 | 1988-12-29 | Alcatel Business Systems | Franking machine incorporating ink-jet printer and microprocessor for accounting and control |
GB2206082B (en) * | 1987-06-17 | 1991-05-15 | Alcatel Business Systems | Franking machine |
EP0534495A1 (en) * | 1988-06-03 | 1993-03-31 | Canon Kabushiki Kaisha | Liquid emission recording head, substrate therefor and liquid emission recording apparatus utilizing said head |
US4870433A (en) * | 1988-07-28 | 1989-09-26 | International Business Machines Corporation | Thermal drop-on-demand ink jet print head |
EP0352978A2 (en) * | 1988-07-28 | 1990-01-31 | Lexmark International, Inc. | A thermal drop-on-demand ink jet print head |
EP0352978A3 (en) * | 1988-07-28 | 1990-07-18 | Lexmark International, Inc. | A thermal drop-on-demand ink jet print head |
EP0396315A1 (en) * | 1989-05-01 | 1990-11-07 | Xerox Corporation | Thermal ink jet printhead with bubble generating heating elements |
EP0514706A2 (en) * | 1991-05-24 | 1992-11-25 | Hewlett-Packard Company | Process for manufacturing thermal ink jet printheads having metal substrates and printheads manufactured thereby |
EP0514706A3 (en) * | 1991-05-24 | 1993-07-28 | Hewlett-Packard Company | Process for manufacturing thermal ink jet printheads having metal substrates and printheads manufactured thereby |
EP0638424A2 (en) * | 1993-08-09 | 1995-02-15 | Hewlett-Packard Company | Thermal ink jet printhead and method of manufacture |
EP0638424A3 (en) * | 1993-08-09 | 1996-07-31 | Hewlett Packard Co | Thermal ink jet printhead and method of manufacture. |
US6227640B1 (en) | 1994-03-23 | 2001-05-08 | Hewlett-Packard Company | Variable drop mass inkjet drop generator |
US6594899B2 (en) | 1994-03-23 | 2003-07-22 | Hewlett-Packard Development Company, L.P. | Variable drop mass inkjet drop generator |
US6070969A (en) * | 1994-03-23 | 2000-06-06 | Hewlett-Packard Company | Thermal inkjet printhead having a preferred nucleation site |
EP0707964A3 (en) * | 1994-10-20 | 1997-03-19 | Canon Kk | Liquid jet head, head cartridge, liquid jet apparatus, method of ejecting liquid, and method of injecting ink |
US5731828A (en) * | 1994-10-20 | 1998-03-24 | Canon Kabushiki Kaisha | Ink jet head, ink jet head cartridge and ink jet apparatus |
US5754201A (en) * | 1994-10-20 | 1998-05-19 | Canon Kabushiki Kaisha | Liquid jet head, head cartridge, liquid jet apparatus, method of ejecting liquid, and method of injecting ink |
US5880762A (en) * | 1994-10-20 | 1999-03-09 | Canon Kabushiki Kaisha | Ink jet head with preliminary heater element |
US6439690B2 (en) | 1994-10-20 | 2002-08-27 | Canon Kabushiki Kaisha | Element substrate having connecting wiring between heat generating resistor elements and ink jet recording apparatus |
EP0707963A3 (en) * | 1994-10-20 | 1997-03-12 | Canon Kk | Ink jet head, ink jet head cartridge and ink jet apparatus |
EP0775580A3 (en) * | 1995-11-27 | 1997-10-22 | Samsung Electronics Co Ltd | Print head for bubble jet printer |
US6540325B2 (en) | 1996-02-07 | 2003-04-01 | Hewlett-Packard Company | Printer printhead |
US6310639B1 (en) | 1996-02-07 | 2001-10-30 | Hewlett-Packard Co. | Printer printhead |
US6485128B1 (en) | 1996-03-04 | 2002-11-26 | Hewlett-Packard Company | Ink jet pen with a heater element having a contoured surface |
EP0803361A2 (en) * | 1996-04-22 | 1997-10-29 | Canon Kabushiki Kaisha | Ink-jet head, ink-jet cartridge, and ink jet recording apparatus |
EP0803361A3 (en) * | 1996-04-22 | 1998-08-19 | Canon Kabushiki Kaisha | Ink-jet head, ink-jet cartridge, and ink jet recording apparatus |
US6290335B1 (en) | 1996-04-22 | 2001-09-18 | Canon Kabushiki Kaisha | Ink-jet head, ink-jet cartridge, and ink jet recording apparatus |
US6079811A (en) * | 1997-01-24 | 2000-06-27 | Lexmark International, Inc. | Ink jet printhead having a unitary actuator with a plurality of active sections |
EP0855277A2 (en) * | 1997-01-24 | 1998-07-29 | Lexmark International, Inc. | Ink jet printhead for dropsize modulation |
EP0855277A3 (en) * | 1997-01-24 | 1999-06-16 | Lexmark International, Inc. | Ink jet printhead for dropsize modulation |
US6402283B2 (en) | 1999-04-29 | 2002-06-11 | Hewlett-Packard Company | Variable drop mass inkjet drop generator |
US6276775B1 (en) | 1999-04-29 | 2001-08-21 | Hewlett-Packard Company | Variable drop mass inkjet drop generator |
US6309052B1 (en) * | 1999-04-30 | 2001-10-30 | Hewlett-Packard Company | High thermal efficiency ink jet printhead |
US6491377B1 (en) | 1999-08-30 | 2002-12-10 | Hewlett-Packard Company | High print quality printhead |
US6280019B1 (en) * | 1999-08-30 | 2001-08-28 | Hewlett-Packard Company | Segmented resistor inkjet drop generator with current crowding reduction |
US6422688B2 (en) | 1999-08-30 | 2002-07-23 | Hewlett-Packard Company | Segmented resistor inkjet drop generator with current crowding reduction |
EP1080905A1 (en) * | 1999-08-30 | 2001-03-07 | Hewlett-Packard Company | Segmented resistor inkjet drop generator with current crowding reduction |
US6139131A (en) * | 1999-08-30 | 2000-10-31 | Hewlett-Packard Company | High drop generator density printhead |
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Also Published As
Publication number | Publication date |
---|---|
JPS59207262A (en) | 1984-11-24 |
JPH0448623B2 (en) | 1992-08-07 |
EP0124312A3 (en) | 1985-08-28 |
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