USRE34497E - Low diffusion disk drive breather vent - Google Patents

Low diffusion disk drive breather vent Download PDF

Info

Publication number
USRE34497E
USRE34497E US07/359,767 US35976789A USRE34497E US RE34497 E USRE34497 E US RE34497E US 35976789 A US35976789 A US 35976789A US RE34497 E USRE34497 E US RE34497E
Authority
US
United States
Prior art keywords
disk drive
iaddend
iadd
passage
interior
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.)
Expired - Lifetime
Application number
US07/359,767
Inventor
John B. Blanks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seagate Technology LLC
Original Assignee
Magnetic Peripherals Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US07/359,767 priority Critical patent/USRE34497E/en
Application filed by Magnetic Peripherals Inc filed Critical Magnetic Peripherals Inc
Assigned to SECURITY PACIFIC NATIONAL BANK, AS AGENT reassignment SECURITY PACIFIC NATIONAL BANK, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAGNETIC PERIPHERALS, INC.
Assigned to SEAGATE TECHNOLOGY, INC., A CORP. OF DELAWARE reassignment SEAGATE TECHNOLOGY, INC., A CORP. OF DELAWARE MERGER (SEE DOCUMENT FOR DETAILS). Assignors: MAGNETIC PERIPHERALS INC., A CORP. OF DELAWARE
Assigned to SEAGATE TECHNOLOGY, INC. reassignment SEAGATE TECHNOLOGY, INC. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 07/02/1990 DELAWARE Assignors: MAGNETIC PHERIPHERALS INC.
Assigned to SEAGATE TECHNOLOGY, INC. reassignment SEAGATE TECHNOLOGY, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANKAMERICA
Publication of USRE34497E publication Critical patent/USRE34497E/en
Application granted granted Critical
Assigned to SEAGATE TECHNOLOGY LLC reassignment SEAGATE TECHNOLOGY LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEAGATE TECHNOLOGY, INC.
Assigned to THE CHASE MANHATTAN BANK, AS COLLATERAL AGENT reassignment THE CHASE MANHATTAN BANK, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: SEAGATE TECHNOLOGY LLC
Assigned to JPMORGAN CHASE BANK, AS COLLATERAL AGENT reassignment JPMORGAN CHASE BANK, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: SEAGATE TECHNOLOGY LLC
Assigned to SEAGATE TECHNOLOGY LLC reassignment SEAGATE TECHNOLOGY LLC RELEASE OF SECURITY INTERESTS IN PATENT RIGHTS Assignors: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT (FORMERLY KNOWN AS THE CHASE MANHATTAN BANK AND JPMORGAN CHASE BANK)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • G11B33/1486—Control/regulation of the pressure, e.g. the pressure inside the housing of a drive

Definitions

  • the invention relates to sealed disk drives and means to reduce humidity inside the drive.
  • U.S. Pat. No. 4,620,248 discloses and claims a relatively long narrow tube communicating between outside air and the interior of a sealed disk drive.
  • the tube so constructed, allows pressure equalization between the inside and outside of the housing during disk drive operation, but also retards water vapor diffusion into the housing. Humidity increases friction, particularly static friction, between the head and the magnetic surface, which undesirably reduces disk/head life.
  • the invention comprises a vent cap having, or forming, a long narrow communication passage between the vent and the outside air of a sealed disk drive.
  • the long, narrow passage allows pressure equalization while retarding water vapor diffusion into the sealed drive.
  • FIG. 1 is a plan view of the interior side of the cap.
  • FIG. 2 is a cross section of the cap along 2--2 of FIG. 1.
  • FIG. 3 is the vent outlet and filter of a sealed drive.
  • FIG. 4 is an alternative cap/vent mounting .[.arrangemnt.]. .Iadd.arrangement..Iaddend.
  • FIG. 1 shows a plan view of the preferred vent cap 10.
  • the cap includes ridges 20 which form a hollow groove 12 communicating between an inlet 14 and an outlet 16.
  • the groove 12 comprises a half cylinder as can better be seen in FIG. 2.
  • attachment boss 18, which is preferably threaded, for attaching cap 10 to vent outlet 30 (FIG. 3) .Iadd.of a sealed disk drive housing 31; .Iaddend.via a correspondingly threaded bore 40.
  • the sealed disk drive housing 31 (only a portion being shown in FIGS. 3 and 4) has a disk (not shown) mounted therein.
  • ridges 20 press against a gasket 32 mounted about the vent passageway 42 making an airtight seal therewith so that the only avenue for air to communicate between the outside air and the vent passageway 42 is through inlet 14, groove 12 and outlet 16.
  • a filter 44 for filtering dust out of the air which may enter vent passageway 42. Passageway 42 communicates to the interior of a sealed disk drive (not shown).
  • groove 12 tracks the curvature of the circular cross sectional cap and doubles back on itself at elbow 22. This provides for a long path relative to the narrow cross section of the path between inlet 14 and outlet 16. This long, narrow path provides for pressure equalization during drive operation while retarding and reducing water vapor ingress.
  • groove 12 is essentially a tube. It can be shown that the pressure differential through a tube is proportional to the length of the tube divided by the fourth power of its internal diameter (bore):
  • the diffusion mass flow rate of water vapor through dry air in a tube is proportional to the square of the internal diameter (bore) of the tube divided by its length:
  • the tube should be as long as practical and have a diameter great enough as to not create a serious pressure differential. Further, it should have a bore large enough that the effects of .[.surfaces.]. .Iadd.surface .Iaddend.tension and friction between air and water flowing in the tube and the surface of the tube are not .[.significantly.]. .Iadd.significant and the flow of air and water vapor is substantially .Iaddend.laminar, and the tube should be long enough as to minimize the mass flow rate of water vapor through the tube.
  • the tube must not be a capillary tube.
  • a tube 10 inches in length should have a bore no smaller than 0.011 inch; a tube 20 inches in length should have a bore no smaller than 0.013 inch. Tubes with bores greater than minimum may be used, recognizing that a sacrifice of water vapor diffusion will occur.
  • cap 10 is 0.875 .[.inches.]. .Iadd.inch .Iaddend.in diameter.
  • Groove 12 is 0.030 .[.inches.]. .Iadd.inch .Iaddend.in diameter, and when ridges 20 are pressed against gasket 32, the resulting passageway is approximately 0.0006 square .[.inches.]. .Iadd.inch .Iaddend.in cross section. The length of the groove is approximately 4.9 inches.
  • FIG. 4 shows an alternate preferred embodiment in which cap 10 is mounted on a top cover 50 of a sealed disk drive about the opening of a breather vent comprised of a plurality of inlet holes 60.
  • the boss 18 is inserted into a corresponding bore in the top cover 50 and heat staked to form an expanded end 52 which holds the cap 10 on the top cover 50.
  • the airtight seal is maintained by circular adhesive tape 54, which is adhesive on both sides.
  • the cap presses against the tape, forcing the tape to press against the top cover.
  • the groove 12 permits air ingress and egress.
  • the tape 54 extends inwardly to cover an outer circumferential portion of a circular filter 58 and held in against the top cover 50. The inner circumferential portion of this filter is held against cap 10 at boss 18 by O-ring 56.

Abstract

.[.A vent cap has.]. .Iadd.A low diffusion disk drive breather vent for communicating air between the interior and the exterior of a sealed disk drive housing through a vent passageway, .Iaddend.a long, narrow air communication passage .[.covering the vent outlet of a sealed disk drive. The passage reduces.]. .Iadd.provided to reduce .Iaddend.diffusion of water vapor .[.into the disk drive.]. .Iadd.through the passage.Iaddend..

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention.
The invention relates to sealed disk drives and means to reduce humidity inside the drive.
2. Brief Description of the Prior Art.
The best prior art known to Applicant is shown in Ser. No. 646,537 filed Sep. 4, 1984, now U.S. Pat. No. 4,620,248 granted Oct. 28, 1986 and assigned to the present assignee. Applicant incorporates by reference the contents of this application.
U.S. Pat. No. 4,620,248 discloses and claims a relatively long narrow tube communicating between outside air and the interior of a sealed disk drive. The tube, so constructed, allows pressure equalization between the inside and outside of the housing during disk drive operation, but also retards water vapor diffusion into the housing. Humidity increases friction, particularly static friction, between the head and the magnetic surface, which undesirably reduces disk/head life.
SUMMARY OF THE INVENTION
The invention comprises a vent cap having, or forming, a long narrow communication passage between the vent and the outside air of a sealed disk drive. The long, narrow passage allows pressure equalization while retarding water vapor diffusion into the sealed drive.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of the interior side of the cap.
FIG. 2 is a cross section of the cap along 2--2 of FIG. 1.
FIG. 3 is the vent outlet and filter of a sealed drive.
FIG. 4 is an alternative cap/vent mounting .[.arrangemnt.]. .Iadd.arrangement..Iaddend.
DETAILED DESCRIPTION
FIG. 1 shows a plan view of the preferred vent cap 10. The cap includes ridges 20 which form a hollow groove 12 communicating between an inlet 14 and an outlet 16. The groove 12 comprises a half cylinder as can better be seen in FIG. 2. Mounted at the center of cap 10 is attachment boss 18, which is preferably threaded, for attaching cap 10 to vent outlet 30 (FIG. 3) .Iadd.of a sealed disk drive housing 31; .Iaddend.via a correspondingly threaded bore 40. .Iadd.The sealed disk drive housing 31 (only a portion being shown in FIGS. 3 and 4) has a disk (not shown) mounted therein. .Iaddend.When .Iadd.the cap 10 is .Iaddend.mounted on the vent outlet 30, ridges 20 press against a gasket 32 mounted about the vent passageway 42 making an airtight seal therewith so that the only avenue for air to communicate between the outside air and the vent passageway 42 is through inlet 14, groove 12 and outlet 16. Also shown in FIG. 3 is a filter 44 for filtering dust out of the air which may enter vent passageway 42. Passageway 42 communicates to the interior of a sealed disk drive (not shown).
As can be seen from FIG. 1, groove 12 tracks the curvature of the circular cross sectional cap and doubles back on itself at elbow 22. This provides for a long path relative to the narrow cross section of the path between inlet 14 and outlet 16. This long, narrow path provides for pressure equalization during drive operation while retarding and reducing water vapor ingress.
In the following discussion, groove 12 is essentially a tube. It can be shown that the pressure differential through a tube is proportional to the length of the tube divided by the fourth power of its internal diameter (bore):
ΔP≈1/d.sup.4
On the other hand, the diffusion mass flow rate of water vapor through dry air in a tube is proportional to the square of the internal diameter (bore) of the tube divided by its length:
ΔQ≈d.sup.2 /1
It is desirable to maintain both the pressure differential, ΔP, and the mass flow rate of water vapor, ΔQ, as low as possible. It is evident that for a given length of tube, doubling the diameter will reduce the pressure differential by a factor of sixteen but will increase the mass flow rate of water vapor by a factor of only four. Conversely, lengthening a tube will increase the pressure differential and decrease the mass flow rate of water vapor in equal proportions. Therefore, for a given set of parameters associated with a given tube, if the length is increased by sixteen-fold and the diameter is doubled, the mass flow rate of water vapor by diffusion will be decreased by a factor of four while the pressure differential is unchanged.
It is evident that the tube should be as long as practical and have a diameter great enough as to not create a serious pressure differential. Further, it should have a bore large enough that the effects of .[.surfaces.]. .Iadd.surface .Iaddend.tension and friction between air and water flowing in the tube and the surface of the tube are not .[.significantly.]. .Iadd.significant and the flow of air and water vapor is substantially .Iaddend.laminar, and the tube should be long enough as to minimize the mass flow rate of water vapor through the tube. The tube must not be a capillary tube.
Assuming a maximum rate of air expulsion of 5 cubic inches per hour due to thermal excursions of the disk drive, to maintain a pressure differential smaller than 0.1 psi, a tube 10 inches in length should have a bore no smaller than 0.011 inch; a tube 20 inches in length should have a bore no smaller than 0.013 inch. Tubes with bores greater than minimum may be used, recognizing that a sacrifice of water vapor diffusion will occur.
In the preferred embodiment, cap 10 is 0.875 .[.inches.]. .Iadd.inch .Iaddend.in diameter. Groove 12 is 0.030 .[.inches.]. .Iadd.inch .Iaddend.in diameter, and when ridges 20 are pressed against gasket 32, the resulting passageway is approximately 0.0006 square .[.inches.]. .Iadd.inch .Iaddend.in cross section. The length of the groove is approximately 4.9 inches.
It is understood that a passage connecting the inlet 14 with outlet 16 and formed entirely within cap 10 is also within the scope of the present invention.
FIG. 4 shows an alternate preferred embodiment in which cap 10 is mounted on a top cover 50 of a sealed disk drive about the opening of a breather vent comprised of a plurality of inlet holes 60. In this embodiment, the boss 18 is inserted into a corresponding bore in the top cover 50 and heat staked to form an expanded end 52 which holds the cap 10 on the top cover 50. The airtight seal is maintained by circular adhesive tape 54, which is adhesive on both sides. The cap presses against the tape, forcing the tape to press against the top cover. The groove 12 permits air ingress and egress. The tape 54 extends inwardly to cover an outer circumferential portion of a circular filter 58 and held in against the top cover 50. The inner circumferential portion of this filter is held against cap 10 at boss 18 by O-ring 56. By this arrangement, outside air reaching the interior of cap 10 must pass through filter 58 to reach the air inlet holes 60 of the vent.

Claims (14)

I claim:
1. .[.A.]. .Iadd.In an .Iaddend.apparatus for communicating air between the interior and exterior of a sealed disk drive housing while reducing communication of water vapor between the interior and exterior of said disk drive housing.Iadd., said disk drive housing having a disk drive mounted in the interior thereof, the improvement .Iaddend.comprising:
.[.a sealed disk drive housing having an interior and an exterior;.].
.[.a disk drive mounted in the interior of said housing;.].
a vent outlet mounted on said sealed disk drive housing and having a passageway communicating between the interior and exterior of said sealed disk drive housing;
a vent cap having exterior and interior surfaces, said cap being mounted over the vent outlet with the interior surface facing said vent outlet passageway;
means for forming an airtight seal between the .[.exterior surface of the.]. cap and the vent passageway; and
a .[.long, narrow.]. passage communicating between the exterior and interior surfaces of said cap, the length and cross section of the passage being arranged to provide airpressure equalization and reduced water vapor communication between the interior and exterior of the housing, the passage .[.generally tracking the circumference of the cap and.]. having a length .[.at least equal to the circumference of the cap.]. and a cross section minimum determined by the length of the passage and a predetermined minimum pressure differential between the interior and exterior of the disk drive housing at a predetermined airflow rate, the passage length further being long enough such that such minimum cross section is large enough that the flow of air and water vapor in the passage is essentially laminar.
2. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.pparatus for communicating air between the interior and exterior of a sealed disk drive housing while reducing communication of water vapor between the interior and exterior of said disk drive housing.Iadd., said disk drive housing having a disk drive mounted in the interior portion thereof, the improvement .Iaddend.comprising:
.[.a sealed disk drive housing having an interior and an exterior;.].
.[.a disk drive mounted in the interior of said housing;.].
a vent outlet mounted on said sealed disk drive housing and having a passageway communicating between the interior and exterior of said sealed disk drive housing;
a gasket mounted about the passageway; and
a vent cap having ridges forming a .[.long, narrow.]. groove between an inlet opening and an outlet opening, said cap being mounted on said vent outlet with said ridges pressed against said gasket and forming an airtight seal therewith such that the groove provides a communicating passage between the vent passageway and the exterior of said disk drive housing, the length and cross section of the groove being arranged to provide air-pressure equalization and reduced water vapor communication between the interior and exterior of the housing, the passage .[.generally tracking the circumference of the cap and having a length at least equal to the circumference of the cap and a cross section minimum determined by the length of the passage and.]. .Iadd.having a length and cross section so as to provide .Iaddend.a predetermined minimum pressure differential between the interior and exterior of the disk drive housing at a predetermined airflow rate, the passage length .[.further.]. being long enough such that such minimum cross section is large enough that the flow of air and water vapor in the passage is essentially laminar.
3. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.pparatus according to claim 1 wherein the cap is circular and the .[.long, narrow.]. passage follows the curvature of the cap.
4. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 3 wherein said .[.long, narrow.]. passage further includes at least one elbow wherein the passage doubles back on itself.
5. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 2 wherein the cap is circular and the .[.long, narrow.]. groove follows the curvature of the cap.
6. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim .[.3.]. .Iadd.2 .Iaddend.wherein said .[.long, narrow.]. groove further includes at least one elbow wherein the passage doubles back on itself.
7. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.for communicating air between the interior and exterior of a sealed disk drive housing while reducing communication of water vapor between the interior and exterior of said disk drive housing.Iadd., said disk drive housing having a disk drive mounted in the interior thereof, the improvement .Iaddend.comprising:
.[.a sealed disk drive housing having an interior and an exterior;.].
.[.a disk drive mounted in the interior of said housing;.].
a vent outlet mounted on said sealed disk drive housing and having at least one passageway communicating between the interior and exterior of said sealed disk drive housing;
.[.a.]. sealing means mounted on said vent outlet and enclosing the passageway;
a vent cap having ridges forming a .[.long, narrow.]. groove between an inlet opening and an outlet opening, the cap mounted on said vent outlet with said ridges pressed against said sealing means and forming an airtight seal therewith such that the groove provides a communicating passage between the vent passageway and the exterior of the housing, the length and cross section of the groove being arranged to provide air-pressure equalization and reduced water vapor communication between the interior and exterior of the housing, the passage .[.generally tracking the circumference of the cap and.]. having a length at least equal to the circumference of the cap and a cross section minimum determined by the length of the passage and a predetermined minimum pressure differential between the interior and exterior of the disk drive housing at a predetermined airflow rate, the passage length further being long enough such that such minimum cross section is large enough that the flow of air and water vapor in the passage is essentially laminar.
8. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 7 wherein the sealing means comprises double-sided adhesive tape.
9. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 7 .Iadd.the improvement .Iaddend.further .[.including.]. .Iadd.comprising.Iaddend.:
a central boss mounted on said cap;
an O-ring mounted about said boss; and
a filter captured at an inner portion between the O-ring and the cap.
10. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 8 .Iadd.the improvement .Iaddend.further .[.including.]. .Iadd.comprising.Iaddend.:
a central boss mounted on said cap;
an O-ring mounted about said boss; and
a filter captured at an inner portion between the O-ring and the cap and at an outer portion between said double-sided adhesive tape and said disk drive.
11. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 7 wherein the cap is circular and the .[.long, narrow.]. groove follows the curvature of the cap.
12. .Iadd.In an .Iaddend..[.Apparatus.]. .Iadd.apparatus.Iaddend.according to claim 11 wherein said .[.long, narrow.]. groove further includes at least one elbow wherein the passage doubles back on itself. .Iadd.13. In an apparatus for communicating air between the interior and exterior of a sealed disk drive housing while reducing communication of water vapor between the interior and exterior of the disk drive housing, said disk drive housing having a disk drive mounted in the interior thereof, the improvement comprising:
vent means mounted on the sealed disk drive housing for providing communication between the interior and exterior of the sealed disk drive housing; and
air passage means for equalizing air-pressure between the interior and exterior of the sealed disk drive housing and for reducing water vapor communication between the interior and exterior thereof, the air passage means comprising a passage communicating between the exterior of the sealed disk drive housing and the vent means, the passage having a cross section minimum determined by the length of the passage and a predetermined minimum pressure differential between the interior and exterior of the sealed disk drive housing at a predetermined airflow rate, the passage length and cross section determined to effect essentially laminar flow of air and water vapor therethrough. .Iaddend. .Iadd.14. In an apparatus according to claim 13 wherein the vent means comprises:
a vent outlet mounted on the sealed disk drive housing;
a vent cap; and
wherein the passage of the air passage means comprises a groove extending between an inlet opening and an outlet opening, the vent cap mounted on the vent outlet such that the passage is formed therebetween. .Iaddend. .Iadd.15. In an apparatus of claim 14 the improvement comprising:
gasket means disposed between the sealed disk drive housing and the vent cap so as to be disposed adjacent the ridges of the air passage means. .Iaddend. .Iadd.16. In an apparatus of claim 15 wherein the vent cap is circular and wherein the passage of the air passage means follows the curvature of the cap. .Iaddend. .Iadd.17. In an apparatus of claim 16 wherein the passage includes at least one elbow wherein said passage doubles back on itself. .Iaddend. .Iadd.18. In an apparatus of claim 13 wherein the vent means further comprises:
filter means for filtering air communicated to the interior of the sealed disk drive housing. .Iaddend. .Iadd.19. In a disk drive apparatus in which air is communicated between the interior and the exterior of a sealed disk drive housing having a disk drive mounted therein, improvement comprising:
vent means for providing air communication between the interior and exterior of the sealed disk drive housing; and
air passage means communicating with the vent means for equalizing air-pressure between the interior and exterior of the sealed disk drive housing and for reducing water vapor communication between the interior and exterior thereof, the air passage means comprising a passage communicating between the exterior of the sealed disk drive housing and the vent means, the passage having a cross section minimum determined by the length thereof so that a predetermined minimum pressure differential is established between the interior and exterior of the sealed disk drive housing at a predetermined airflow rate, the length and cross section of the passage determined to effect laminar air and water vapor flow therethrough. .Iaddend. .Iadd.20. In a disk drive according to claim 19 wherein the vent means comprises:
a vent outlet supported by the sealed disk drive housing;
a vent cap; and
wherein the passage of the air passage means comprises a groove formed between the vent cap and the sealed disk drive housing and which extends between an inlet opening and an outlet opening. .Iaddend. .Iadd.21. In a disk drive apparatus of claim 20 the improvement further comprising:
gasket means disposed between the sealed disk drive housing and the vent cap ridges for forming an airtight seal. .Iaddend. .Iadd.22. In a disk drive apparatus of claim 21 wherein the vent cap is circular, and wherein
the passage follows the curvature of the cap. .Iaddend. .Iadd.23. In a disk drive apparatus of claim 22 wherein the passage includes at least one
elbow wherein said passage doubles back on itself. .Iaddend. .Iadd.24. In a disk drive apparatus of claim 23 wherein the improvement further comprises:
filter means for filtering air communicated to the interior of the sealed disk drive housing. .Iaddend.
US07/359,767 1986-05-22 1989-05-31 Low diffusion disk drive breather vent Expired - Lifetime USRE34497E (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US07/359,767 USRE34497E (en) 1986-05-22 1989-05-31 Low diffusion disk drive breather vent

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/865,698 US4751594A (en) 1986-05-22 1986-05-22 Low diffusion disk drive breather vent
US07/359,767 USRE34497E (en) 1986-05-22 1989-05-31 Low diffusion disk drive breather vent

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06/865,698 Reissue US4751594A (en) 1986-05-22 1986-05-22 Low diffusion disk drive breather vent

Publications (1)

Publication Number Publication Date
USRE34497E true USRE34497E (en) 1994-01-04

Family

ID=25346048

Family Applications (2)

Application Number Title Priority Date Filing Date
US06/865,698 Ceased US4751594A (en) 1986-05-22 1986-05-22 Low diffusion disk drive breather vent
US07/359,767 Expired - Lifetime USRE34497E (en) 1986-05-22 1989-05-31 Low diffusion disk drive breather vent

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US06/865,698 Ceased US4751594A (en) 1986-05-22 1986-05-22 Low diffusion disk drive breather vent

Country Status (5)

Country Link
US (2) US4751594A (en)
EP (1) EP0246756B1 (en)
JP (1) JPS62281186A (en)
AU (1) AU7221187A (en)
DE (1) DE3765999D1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5521776A (en) * 1993-12-14 1996-05-28 Nec Corporation Magnetic disk drive with dust cleaning function
US5877915A (en) * 1995-10-30 1999-03-02 Fujitsu Limited Ventilation structure of a cover for a disk drive
US5907454A (en) * 1996-05-15 1999-05-25 Samsung Electronics Co., Ltd. Technique for preventing dew from forming on internal components of hard disk drive
US20020039340A1 (en) * 2000-10-02 2002-04-04 Minoru Minase Disk device
US6822824B2 (en) 2002-06-07 2004-11-23 Seagate Technology Llc Flex circuit bracket which establishes a diffusion path for a data storage device housing
US20050139077A1 (en) * 2003-12-31 2005-06-30 Garikipati Vijay K. Dual diffusion channel filter

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4863499A (en) * 1988-07-29 1989-09-05 Donaldson Company, Inc. Anti-duffusion chemical breather assembly for disk drives
US5276577A (en) * 1989-04-17 1994-01-04 International Business Machines Corporation Head-disk enclosure seal for magnetic disk storage device
US5025336A (en) * 1989-11-06 1991-06-18 Prairietek Corporation Disk drive apparatus
US5359475A (en) * 1992-03-23 1994-10-25 Minnesota Mining And Manufacturing Company Air filter system for helical scanner drum with vented drum cover
US5307222A (en) * 1992-11-13 1994-04-26 Maxtor Corporation Air filter and circulation system for a hard disk drive
US5980616A (en) * 1993-02-16 1999-11-09 Donaldson Company, Inc. Filter media for preventing carbon migration
JP2553316B2 (en) * 1993-03-02 1996-11-13 インターナショナル・ビジネス・マシーンズ・コーポレイション Data storage disk drive device
US5590001A (en) * 1994-03-15 1996-12-31 Fujitsu Limited Breather filter unit for magnetic disk drive
US6088190A (en) * 1994-11-08 2000-07-11 Seagate Technology, Inc. Disk drive including multi-stage environmental diffusion buffer
KR100417230B1 (en) * 1996-05-29 2004-04-21 삼성전자주식회사 Method for sealing gap between two coupled components without using gasket
US5876487A (en) * 1997-03-17 1999-03-02 Donaldson Company, Inc. Adsorbent construction; and, method
US6143058A (en) * 1997-03-17 2000-11-07 Donaldson Company, Inc. Adsorbent construction and method
JP3889153B2 (en) * 1998-06-12 2007-03-07 富士通株式会社 Disk unit
US6146446A (en) * 1998-10-08 2000-11-14 Donaldson Company, Inc. Filter assembly with shaped adsorbent article; and devices and methods of use
US6168651B1 (en) 1998-10-08 2001-01-02 Donaldson Company, Inc. Filter assembly with shaped adsorbent article; and devices and methods of use
US6214070B1 (en) 1999-07-19 2001-04-10 Maxtor Corporation Disk drive filter
GB0118573D0 (en) * 2001-07-31 2001-09-19 Stonewood Electronics Ltd Flag stone

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921849A (en) * 1973-12-03 1975-11-25 Itw Ltd Sealing caps
US4036393A (en) * 1975-07-24 1977-07-19 Societe De Diffusion Neiman Cap for a fuel tank
JPS57105872A (en) * 1980-12-19 1982-07-01 Toshiba Corp Magnetic disc device
JPS5933683A (en) * 1982-08-17 1984-02-23 Mitsubishi Electric Corp Fixed magnetic disk device
US4594626A (en) * 1984-02-13 1986-06-10 Xerox Corporation Air filtration system for rotating disk drives having recirculating air flows
US4599670A (en) * 1979-06-29 1986-07-08 International Business Machines Corporation Control of relative humidity in machine enclosures
US4620248A (en) * 1984-09-04 1986-10-28 Magnetic Peripherals Inc. Apparatus for controlling humidity in a disk drive
US4631620A (en) * 1984-03-23 1986-12-23 Fuji Photo Film Co., Ltd. Magnetic disk cartridge
US4633349A (en) * 1984-07-23 1986-12-30 International Business Machines Corporation Disk drive air filter assembly
US4642715A (en) * 1984-11-01 1987-02-10 Miltope Corporation Environmental conditioning and safety system for disk-type mass memories

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329722A (en) * 1980-05-15 1982-05-11 Priam Corporation Enclosed disc drive having combination filter assembly

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921849A (en) * 1973-12-03 1975-11-25 Itw Ltd Sealing caps
US4036393A (en) * 1975-07-24 1977-07-19 Societe De Diffusion Neiman Cap for a fuel tank
US4599670A (en) * 1979-06-29 1986-07-08 International Business Machines Corporation Control of relative humidity in machine enclosures
JPS57105872A (en) * 1980-12-19 1982-07-01 Toshiba Corp Magnetic disc device
JPS5933683A (en) * 1982-08-17 1984-02-23 Mitsubishi Electric Corp Fixed magnetic disk device
US4594626A (en) * 1984-02-13 1986-06-10 Xerox Corporation Air filtration system for rotating disk drives having recirculating air flows
US4631620A (en) * 1984-03-23 1986-12-23 Fuji Photo Film Co., Ltd. Magnetic disk cartridge
US4633349A (en) * 1984-07-23 1986-12-30 International Business Machines Corporation Disk drive air filter assembly
US4620248A (en) * 1984-09-04 1986-10-28 Magnetic Peripherals Inc. Apparatus for controlling humidity in a disk drive
US4642715A (en) * 1984-11-01 1987-02-10 Miltope Corporation Environmental conditioning and safety system for disk-type mass memories

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5521776A (en) * 1993-12-14 1996-05-28 Nec Corporation Magnetic disk drive with dust cleaning function
US5877915A (en) * 1995-10-30 1999-03-02 Fujitsu Limited Ventilation structure of a cover for a disk drive
US5907454A (en) * 1996-05-15 1999-05-25 Samsung Electronics Co., Ltd. Technique for preventing dew from forming on internal components of hard disk drive
US20020039340A1 (en) * 2000-10-02 2002-04-04 Minoru Minase Disk device
US6817023B2 (en) * 2000-10-02 2004-11-09 Teac Corporation Disk device
US6822824B2 (en) 2002-06-07 2004-11-23 Seagate Technology Llc Flex circuit bracket which establishes a diffusion path for a data storage device housing
US20050139077A1 (en) * 2003-12-31 2005-06-30 Garikipati Vijay K. Dual diffusion channel filter
US7125433B2 (en) * 2003-12-31 2006-10-24 Donaldson Company, Inc. Dual diffusion channel filter

Also Published As

Publication number Publication date
JPH0435840B2 (en) 1992-06-12
EP0246756A1 (en) 1987-11-25
JPS62281186A (en) 1987-12-07
AU7221187A (en) 1987-11-26
DE3765999D1 (en) 1990-12-13
EP0246756B1 (en) 1990-11-07
US4751594A (en) 1988-06-14

Similar Documents

Publication Publication Date Title
USRE34497E (en) Low diffusion disk drive breather vent
CA1234625A (en) Apparatus for controlling humidity in a disk drive
US4633349A (en) Disk drive air filter assembly
KR950019250A (en) Blower, suction panel of this device and rectification guide of this device
JP2673477B2 (en) Dehumidifier
USH1067H (en) Breather vent assembly formed in a sealed disk drive housing
JP2000114061A (en) Hygroscopic breathing device
JPH11260650A (en) Moisture absorption respiratory device
US2410528A (en) Microphone
JPS61151892A (en) Air filter of magnetic disk device
JPS6226686A (en) Magnetic disk device
JPH0127513B2 (en)
JPH02236889A (en) Air hole structure of magnetic disk device
JPS5829040B2 (en) speaker system
JPS5839717U (en) Record disc suction device
JPS62281185A (en) Magnetic disk device
JP2000027038A (en) Fine spinning frame having pneumatically loaded top roller holder arm
JPS6213681A (en) Inner and outer pressure balancing method of dual glass
JP2006021076A (en) Hollow fiber membrane dryer
JPS6226687A (en) Magnetic disk device
JPS6276088A (en) Magnetic disc device
JPH0130203B2 (en)
JPS6226833Y2 (en)
JP2002117647A (en) Gas adsorption filter structure
JPH0296694U (en)

Legal Events

Date Code Title Description
AS Assignment

Owner name: SECURITY PACIFIC NATIONAL BANK, AS AGENT, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:MAGNETIC PERIPHERALS, INC.;REEL/FRAME:005184/0213

Effective date: 19890929

AS Assignment

Owner name: SEAGATE TECHNOLOGY, INC., A CORP. OF DELAWARE

Free format text: MERGER;ASSIGNOR:MAGNETIC PERIPHERALS INC., A CORP. OF DELAWARE;REEL/FRAME:005743/0653

Effective date: 19900531

AS Assignment

Owner name: SEAGATE TECHNOLOGY, INC., CALIFORNIA

Free format text: MERGER;ASSIGNOR:MAGNETIC PHERIPHERALS INC.;REEL/FRAME:006486/0237

Effective date: 19900531

AS Assignment

Owner name: SEAGATE TECHNOLOGY, INC., CALIFORNIA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANKAMERICA;REEL/FRAME:006518/0887

Effective date: 19930128

CC Certificate of correction
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
FPAY Fee payment

Year of fee payment: 8

SULP Surcharge for late payment
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 12

SULP Surcharge for late payment
AS Assignment

Owner name: SEAGATE TECHNOLOGY LLC, CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SEAGATE TECHNOLOGY, INC.;REEL/FRAME:011077/0319

Effective date: 20000728

AS Assignment

Owner name: THE CHASE MANHATTAN BANK, AS COLLATERAL AGENT, NEW

Free format text: SECURITY AGREEMENT;ASSIGNOR:SEAGATE TECHNOLOGY LLC;REEL/FRAME:011461/0001

Effective date: 20001122

AS Assignment

Owner name: JPMORGAN CHASE BANK, AS COLLATERAL AGENT, NEW YORK

Free format text: SECURITY AGREEMENT;ASSIGNOR:SEAGATE TECHNOLOGY LLC;REEL/FRAME:013177/0001

Effective date: 20020513

Owner name: JPMORGAN CHASE BANK, AS COLLATERAL AGENT,NEW YORK

Free format text: SECURITY AGREEMENT;ASSIGNOR:SEAGATE TECHNOLOGY LLC;REEL/FRAME:013177/0001

Effective date: 20020513

AS Assignment

Owner name: SEAGATE TECHNOLOGY LLC,CALIFORNIA

Free format text: RELEASE OF SECURITY INTERESTS IN PATENT RIGHTS;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT (FORMERLY KNOWN AS THE CHASE MANHATTAN BANK AND JPMORGAN CHASE BANK);REEL/FRAME:016926/0342

Effective date: 20051130

Owner name: SEAGATE TECHNOLOGY LLC, CALIFORNIA

Free format text: RELEASE OF SECURITY INTERESTS IN PATENT RIGHTS;ASSIGNOR:JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT (FORMERLY KNOWN AS THE CHASE MANHATTAN BANK AND JPMORGAN CHASE BANK);REEL/FRAME:016926/0342

Effective date: 20051130