US5075807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disk device including humidity controller in disk enclosure
Assignee: HGST Japan Ltd
•
Filing: 1990-03-14
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Granted: 1991-12-24
•
Expires: 2010-03-14
Abstract
Abstract There is provided a magnetic recording device including recording mediums and an airtight enclosure containing the recording mediums therein and having a fine breathing hole created therethrough communicating with the outside thereof, wherein at least two types of moisture adsorbents composed of a one way type moisture adsorbent which adsorbs moisture and a reversible type moisture adsorbent which adsorbs moisture in high humidity and conversely discharges the same in low humidity are disposed in the cabinet and used in combination. There is also provided the same device except wherein gas adsorbents and moisture adsorbents are used in combination.
Inventors
- 👤 Yoichi Inoue
- 👤 Katsuyuki Tanaka
- 👤 Hideaki Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:36
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/14; G11B33/1446; G11B33/1453; G11B25/00; G11B25/04; G11B25/043; G11B33/1486
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A magnetic disk device comprising recording mediums and an airtight enclosure containing the recording mediums therein, having a fine breathing hole created therethrough and communicating with the outside thereof, wherein there are disposed in said enclosure a gas adsorbent and a moisture adsorbent, said moisture adsorbent having at least two types of moisture adsorbents including a one way type moisture adsorbent which adsorbs moisture and a reversible type moisture adsorbent which adsorbs moisture in high humidity and conversely discharges the same in low humidity whereby the life of the magnetic disk device is greatly extended as compared with the life using only a reversible type moisture adsorbent.
Claim 2
Dependent Claim
107 words
A magnetic disk device comprising recording mediums and an airtight enclosure containing the recording mediums therein, having a fine breathing hole created therethrough and communicating with the outside thereof, wherein there are disposed in said enclosure a gas adsorbent and a moisture adsorbent, said moisture adsorbent having at least two types of moisture adsorbents including a one way type moisture adsorbent which adsorbs moisture and a reversible type moisture adsorbent which adsorbs moisture in high humidity and conversely discharges the same in low humidity whereby the life of the magnetic disk device is greatly extended as compared with the life using only a reversible type moisture adsorbent.
Claim 3
Dependent Claim
101 words
A magnetic disk device according to claim 1, wherein a first case means is disposed in said enclosure for containing said one way type moisture adsorbent, said first case means having a diaphragm hole capable of generating a pressure difference between inside and outside of the first case means, and wherein a second case means is disposed in said enclosure for containing said reversible type moisture adsorbent, said second case means having an opening, and wherein means are provided for filtering dust to prevent dust from exiting said first and second case means to keep the interior of the enclosure clean.
Claim 4
Dependent Claim
42 words
A magnetic disk device according to claim 1, wherein said fine breathing hole communicating with the outside is composed of a valve structure which is opened only when a pressure difference is produced between the outside and the inside of said enclosure.
Claim 5
Dependent Claim
34 words
A magnetic disk device according to claim 1, wherein said gas adsorbent effectively adsorbs corrosive gases existing in the atmosphere and is interposed in said enclosure between said breathing hole and said moisture adsorbents.
Claim 6
Dependent Claim
26 words
A magnetic disk device according to claim 1, wherein said gas adsorbent is also disposed in said enclosure between said breathing hole and said moisture adsorbent.
Claim 7
Dependent Claim
21 words
A magnetic disk device according to claim 4, wherein said gas adsorbent is disposed mixed with said reversible type moisture adsorbent.
Claim 8
Dependent Claim
27 words
A magnetic disk device according to claim 4, wherein said one way type moisture adsorbent and said reversible type moisture adsorbent are mixed together in said enclosure.
Claim 9
Dependent Claim
27 words
A magnetic disk device according to claim 1, wherein said one way type moisture adsorbent and said reversible type moisture adsorbent are mixed together in said enclosure.
References Cited (Backward Citations)
US4307425A
Cited
US4599670A
Cited
JPS5613570A
Cited
JPS5856270A
Cited
JPS5933683A
Cited
US4620248A
Cited
JPS6192492A
Cited
US4642715A
Cited
JPS61178790A
Cited
US4684510A
Cited
JPS6396789A
Cited
US4831475A
Cited
US4967295A
Cited
JPS6448292A
Cited
US4863499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |