Patent US3720415A successfully refreshed from Google Patents.
US3720415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc drive
Assignee: Mattel Inc
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Filing: 1970-06-08
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Granted: 1973-03-13
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Expires: 1990-06-08
Abstract
Abstract Apparatus for driving optical disc while light passes through it to photocells, in a manner that reduces noise to a minimum, by eliminating the need for a transparent turntable to support the disc. The apparatus includes a stationary plate of electrically conductive material with protuberances thereon which support the disc as it is rotated by a motor, the protuberances having a small area in contact with the disc to minimize the area over which static electricity can accumulate that tends to make the disc stick to the plate.
Inventors
- 👤 C Daniels
- 👤 Branche H La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:12
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/2009; G11B7/00; G11B7/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
Disc driving apparatus comprising: housing means; electrically conductive slider bearing means mounted on said housing means and having a plurality of stationary protuberances spaced from each other about a circle, for supporting a disc; and means for rotating a disc on said bearing means so it rotates relative to said bearing means about an axis concentric with said circle about which said Protuberances are arranged.
Claim 2
Dependent Claim
65 words
Disc driving apparatus comprising: housing means; electrically conductive slider bearing means mounted on said housing means and having a plurality of stationary protuberances spaced from each other about a circle, for supporting a disc; and means for rotating a disc on said bearing means so it rotates relative to said bearing means about an axis concentric with said circle about which said Protuberances are arranged.
Claim 3
Dependent Claim
65 words
Disc driving apparatus comprising: housing means; electrically conductive slider bearing means mounted on said housing means and having a plurality of stationary protuberances spaced from each other about a circle, for supporting a disc; and means for rotating a disc on said bearing means so it rotates relative to said bearing means about an axis concentric with said circle about which said Protuberances are arranged.
Claim 4
Dependent Claim
65 words
Disc driving apparatus comprising: housing means; electrically conductive slider bearing means mounted on said housing means and having a plurality of stationary protuberances spaced from each other about a circle, for supporting a disc; and means for rotating a disc on said bearing means so it rotates relative to said bearing means about an axis concentric with said circle about which said Protuberances are arranged.
Claim 5
Dependent Claim
22 words
The apparatus described in claim 1 wherein said bearing means comprises a sheet of electrically conductive material with rounded protuberances formed therein.
Claim 6
Dependent Claim
34 words
The disc driving apparatus described in claim 1 wherein said bearing means includes a second plurality of protuberances spaced from each other along a second circle which is concentric with said first named circle.
Claim 7
Dependent Claim
74 words
An optical disc playing machine comprising: a housing; a disc supporting member mounted on said housing to remain substantially stationary thereon, said member having a plurality of rounded protuberances on its upper surface for slideably supporting an optical disc; light source means and photodetector means mounted on said housing on opposite sides of the position of a disc on said disc supporting member; and means for rotating a disc on said disc supporting member.
Claim 8
Dependent Claim
74 words
An optical disc playing machine comprising: a housing; a disc supporting member mounted on said housing to remain substantially stationary thereon, said member having a plurality of rounded protuberances on its upper surface for slideably supporting an optical disc; light source means and photodetector means mounted on said housing on opposite sides of the position of a disc on said disc supporting member; and means for rotating a disc on said disc supporting member.
Claim 9
Dependent Claim
19 words
The optical disc playing machine described in claim 4 wherein: said disc-supporting member is constructed of electrically conductive material.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |