US3825951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc memory
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1972-11-20
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Granted: 1974-07-23
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Expires: 1992-11-20
Abstract
Abstract A magnetic disc memory apparatus having a multiplicity of fins secured to a base which supports a motor, a spindle carrying a disc pack, a carriage carrying magnetic head supporting means and an actuator for the carriage. The fins are disposed in the path of externally drawn air so as to minimize the difference between the temperature of the base and the temperature of the disc pack.
Inventors
- 👤 T Katsumori
- 👤 S Kawakami
- 👤 I Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:47
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/021; G11B23/50; G11B23/505; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A magnetic disc memory apparatus comprising in combination: a main supporting base member, a sub-base member which is thermally isolated from said main base member, a motor, a spindle carrying a disc pack and driven by said motor, a carriage carrying a plurality of magnetic heads and head supporting means for controlling movement of said magnetic heads relative to said disc pack, said main base member supporting said motor and said sub-base supporting said spindle and said carriage, a multiplicity of fins on said sub-base, means for conveying a stream of external air over said fins and thence into said disc pack and over said head supporting means, whereby the temperature of the disc pack is quickly brought to a value which is a small and substantially constant difference from the temperature of said sub-base so as to effect quickly upon initiation of operation of said apparatus a predetermined displacement between each magnetic head and its respective track or an associated disc.
Claim 2
Dependent Claim
162 words
A magnetic disc memory apparatus comprising in combination: a main supporting base member, a sub-base member which is thermally isolated from said main base member, a motor, a spindle carrying a disc pack and driven by said motor, a carriage carrying a plurality of magnetic heads and head supporting means for controlling movement of said magnetic heads relative to said disc pack, said main base member supporting said motor and said sub-base supporting said spindle and said carriage, a multiplicity of fins on said sub-base, means for conveying a stream of external air over said fins and thence into said disc pack and over said head supporting means, whereby the temperature of the disc pack is quickly brought to a value which is a small and substantially constant difference from the temperature of said sub-base so as to effect quickly upon initiation of operation of said apparatus a predetermined displacement between each magnetic head and its respective track or an associated disc.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |