Patent US3900893A successfully refreshed from Google Patents.
US3900893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air bearing supported flexible disc device with oppositely rotating stabilization plate
Assignee: Sanyo Electric Co Ltd
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Filing: 1974-02-12
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Granted: 1975-08-19
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Expires: 1994-02-12
Abstract
Abstract A recording and/or reproducing device which utilizes a round flexible foil-type record of magnetizable material, for recording or reproducing video and/or audio signal on the foil-type record through a transducer arrangement while the record is rotated at high speed at its center and concurrently hovers above a rotation-induced air cushion. The recording and/or reproducing device is provided with a rotatable stabilization plate intermediate between the record and the stationary plate or table for rotation about its center. The stabilization plate may be rotated in the same direction as the record or in the opposite direction relative to the record and at the same speed as the record or at different speeds relative to the record.
Inventors
- 👤 Kunio Hirose
- 👤 Akira Mayeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:20
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/32; G11B17/02; G11B17/021; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A recording and/or reproducing device for use with a flexible foil type record which is rotated at high speed, which comprises in combination: a mounting spindle for engaging the record substantially at its center to cause the record to rotate therewith; a stationary plate arranged to underlie the record; a rotatable stabilization plate situated between said record and said stationary plate; means defining at least one passage for the introduction of air between said record and said rotatable stabilization plate; transducer means for coacting with the record; means supporting said transducer means for movement in a radial direction relative to said record; separate means for rotating said mounting spindle together with said record and said rotatable stabilization plate in opposite directions with respect to each other thereby inducing a flow of air from the passage, between the record and said rotatable stabilization plate, and away from the center of the record to form a rotation induced air cushion to permit the record to hover parallel above the rotatable stabilization plate in spaced relation to the latter.
Claim 2
Dependent Claim
176 words
A recording and/or reproducing device for use with a flexible foil type record which is rotated at high speed, which comprises in combination: a mounting spindle for engaging the record substantially at its center to cause the record to rotate therewith; a stationary plate arranged to underlie the record; a rotatable stabilization plate situated between said record and said stationary plate; means defining at least one passage for the introduction of air between said record and said rotatable stabilization plate; transducer means for coacting with the record; means supporting said transducer means for movement in a radial direction relative to said record; separate means for rotating said mounting spindle together with said record and said rotatable stabilization plate in opposite directions with respect to each other thereby inducing a flow of air from the passage, between the record and said rotatable stabilization plate, and away from the center of the record to form a rotation induced air cushion to permit the record to hover parallel above the rotatable stabilization plate in spaced relation to the latter.
Claim 3
Dependent Claim
96 words
The device is claimed in claim 1, further comprising additional means defining another passage for introduction of air between said rotatable stabilization plate and said stationary plate, and wherein when said rotatable stabilization plate is rotated, another flow of air is induced from said another passage, between the rotatable stabilization plate, and away from the center of the rotatable stabilization plate to form another rotation-induced air cushion to permit the stabilization plate to hover substantially parallel to the hovering record above the stationary plate in spaced relation to the latter and also to the hovering record.
Claim 4
Dependent Claim
27 words
The device as claimed in claim 2, wherein said stabilization plate and said record are rotated at the same speed about the axis of said mounting spindle.
Claim 5
Dependent Claim
46 words
The device as claimed in claim 1, wherein said separate means comprises a single electric motor having a drive shaft and wherein said mounting spindle is defined by said drive shaft and said stabilization plate is operatively coupled with said drive shaft through an endless belt.
References Cited (Backward Citations)
US3153241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |