Patent US4536813A successfully refreshed from Google Patents.
US4536813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc recording and/or reproducing apparatus
Assignee: Sony Corp
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Filing: 1982-06-17
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Granted: 1985-08-20
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Expires: 2002-06-17
Abstract
Abstract In an apparatus for recording and/or reproducing signals on a flexible disc which is rotatably mounted in a jacket having an indicator for indicating the number of tracks on which the signals have already been recorded, a transducer records and/or reproduces the signals on a surface of the disc so as to form a plurality of circular tracks thereon. The transducer is subsequently moved in the radial direction of the disc to the next adjacent track. The apparatus is further provided with an indicator driving mechanism for driving the indicator of the jacket to shift the latter to a corresponding position as related to the number of the recorded tracks. The indicator driving mechanism is driven in synchronism with the movement of the transducer.
Inventors
- 👤 Etsuro Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:56
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/035; G11B25/00; G11B25/04; G11B25/043; G11B27/00; G11B27/10; G11B27/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
174 words
Apparatus for recording and/or reproducing information signals on a rotatable magnetic disc contained in a jacket provided with indicator means; said apparatus comprising: transducer means mounted for cooperation with said disc; drive means engageable with said disc for rotating said disc at a first average speed to effect movement of said disc with respect to said transducer means in a direction substantially parallel to the circumferential direction of said disc; and indexing means connected to said transducer means and engageable with said indicator means; said indexing means translating said transducer means at a second average speed to effect movement of said transducer means with respect to said disc in a direction substantially parallel to the radial direction of said disc, said first average speed substantially exceeding said second average speed, whereby said transducer means records and/or reproduces information signals in a plurality of substantially circular tracks on said disc; and said indexing means driving said indicator means to provide an indication related to the position of said transducer means with respect to said disc.
Claim 2
Dependent Claim
174 words
Apparatus for recording and/or reproducing information signals on a rotatable magnetic disc contained in a jacket provided with indicator means; said apparatus comprising: transducer means mounted for cooperation with said disc; drive means engageable with said disc for rotating said disc at a first average speed to effect movement of said disc with respect to said transducer means in a direction substantially parallel to the circumferential direction of said disc; and indexing means connected to said transducer means and engageable with said indicator means; said indexing means translating said transducer means at a second average speed to effect movement of said transducer means with respect to said disc in a direction substantially parallel to the radial direction of said disc, said first average speed substantially exceeding said second average speed, whereby said transducer means records and/or reproduces information signals in a plurality of substantially circular tracks on said disc; and said indexing means driving said indicator means to provide an indication related to the position of said transducer means with respect to said disc.
Claim 3
Dependent Claim
54 words
Apparatus according to claim 1; in which said indicator means comprises a circular dial formed with a pointer; and an index scale adjacent to said dial, said dial and said index scale being movable relative to each other; and said indexing means comprises a drive pin engageable with said dial to rotate the latter.
Claim 4
Dependent Claim
48 words
Apparatus according to claim 2, in which said dial is formed with an aperture for receiving said drive pin therein, said aperture being formed with a recess which constitutes said pointer, and said drive pin is provided with a projection insertable into said recess to rotate said dial.
Claim 5
Dependent Claim
120 words
Apparatus according to claim 3, in which said drive pin is formed with a longitudinal axis and is mounted for movement in an axial direction between an operative position wherein said projection is engaged in said recess and an inoperative position wherein said projection is displaced from said recess; further comprising biased contact means for urging said drive pin towards said operative position, whereby when said drive pin is in said inoperative position said transducer means is deactivated and said drive pin is rotatable to bring said projection into alignment with said recess; said biased contact means reactivating said transducer means and moving said drive pin to said operative position when said projection is brought into alignment with said recess.
Claim 6
Dependent Claim
35 words
Apparatus according to claim 4, in which said indexing means comprises a ratchet wheel and a ratchet pawl for engaging and rotating said ratchet wheel, whereby said transducer means is translated in a stepwise manner.
Claim 7
Dependent Claim
84 words
Apparatus according to claim 5, in which said indexing means further comprises: gear means connected to and driven by said ratchet wheel; cam means connected to and driven by said gear means; lever means pivotably mounted adjacent to said cam means; and cam follower means formed on said lever means and engageable with said cam means; said transducer means being mounted on said lever means, whereby rotation of said ratchet wheel effects pivoting movement of said lever means and translation of said transducer means.
Claim 8
Dependent Claim
37 words
Apparatus according to claim 6, in which said indexing means further comprises solenoid means and means connecting said solenoid means to said ratchet pawl, said solenoid means generating periodic outputs effecting stepwise rotation of said ratchet wheel.
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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |