US4599663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording apparatus with stable disc support and high magnetic flux hold-down
Assignee: Sony Corp
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Filing: 1983-10-03
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Granted: 1986-07-08
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Expires: 2003-10-03
Abstract
Abstract A magnetic recording apparatus includes a rotary disc rotatable about an axis and having an outwardly extending radial flange with three apertures therein; three pins mounted in the apertures on the rotary disc and positioned about a circle concentric with the axis for accurately supporting an information record disc thereon, each of the three pins projecting from the rotary disc to substantially the same height; and a magnet positioned on the flange of the rotary disc and having a height lower than the three pins for magnetically attracting the information record disc to secure the latter on the three pins.
Inventors
- 👤 Etsuro Saito
- 👤 Shinichiro Takahashi
- 👤 Masami Yuasa
- 👤 Tsutomu Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:38
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/0282; G11B19/00; G11B19/20; G11B19/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A magnetic recording apparatus comprising: rotary disc means rotatable about an axis; magnet means positioned on said rotary disc means; and at least three pins mounted on said rotary disc means for rotation therewith and positioned about a circle concentric with said axis for supporting an information record disc thereon, each of said at least three pins projecting from said rotary disc means to substantially the same height relative thereto; and said magnet means having a height lower than said at least three pins relative to said rotary disc means for magnetically attracting an information record disc to secure the latter on said at least three pins so that said at least three pins acurately and exclusively support said information record disc on said rotary disc means.
Claim 2
Dependent Claim
127 words
A magnetic recording apparatus comprising: rotary disc means rotatable about an axis; magnet means positioned on said rotary disc means; and at least three pins mounted on said rotary disc means for rotation therewith and positioned about a circle concentric with said axis for supporting an information record disc thereon, each of said at least three pins projecting from said rotary disc means to substantially the same height relative thereto; and said magnet means having a height lower than said at least three pins relative to said rotary disc means for magnetically attracting an information record disc to secure the latter on said at least three pins so that said at least three pins acurately and exclusively support said information record disc on said rotary disc means.
Claim 3
Dependent Claim
25 words
A magnetic recording apparatus according to claim 1; in which only three pins are mounted on said rotary disc means and positioned about said circle.
Claim 4
Dependent Claim
22 words
A magnetic recording apparatus according to claim 1; in which each pin has a lower cylindrical configuration and an upper frusto-conical configuration.
Claim 5
Dependent Claim
18 words
A magnetic recording apparatus according to claim 1; in which each of said pins has a cylindrical configuration.
Claim 6
Dependent Claim
28 words
A magnetic recording apparatus according to claim 1; in which said pins are spaced from each other about said circle concentric with said axis by substantially equal angles.
Claim 7
Dependent Claim
40 words
A magnetic recording apparatus according to claim 1; in which said magnet means has a raised portion which extends to a height only slightly lower relative to said rotary disc means than the height of said at least three pins.
Claim 8
Dependent Claim
54 words
A magnetic recording apparatus according to claim 1; in which said rotary disc means includes flange means having a plurality of apertures therein; and each of said pins is slidably mounted in a respective one of said apertures and can be positioned therein to adjust the height thereof relative to said rotary disc means.
References Cited (Backward Citations)
US3615070A
Cited
GB1380469A
Cited
US3706085A
Cited
GB1406254A
Cited
US3917068A
Cited
US3815146A
Cited
US3864748A
Cited
DE2443593A1
Cited
US3980308A
Cited
US4040634A
Cited
GB1538568A
Cited
US4232870A
Cited
US4224648A
Cited
US4351047A
Cited
US4387454A
Cited
US4378576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |