US4530083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable memory disk apparatus
Assignee: Toshiba Corp
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Filing: 1983-09-22
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Granted: 1985-07-16
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Expires: 2003-09-22
Abstract
Abstract A rotatable memory disk apparatus is provided with a memory disk with a number of tracks driven by a motor and a control circuit for positioning an optical head on an addressed track. The apparatus includes a speed control device for rotating the disk at a rotational speed corresponding to the addressed track. The speed control device includes a conversion circuit for converting a track-addressing signal from the control circuit into an instruction signal for the rotational speed of the disk, a detector for obtaining a rotational speed signal of the disk, and a control device which receives the rotational speed instruction signal and the rotational speed signal to rotate the disk at a predetermined rotational speed for the addressed track.
Inventors
- 👤 Atsushi Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:12
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
189 words
A rotatable memory disk apparatus comprising: a rotatable memory disk having a plurality of tracks on which data are recorded or from which the recorded data are reproduced; a motor for rotating said memory disk; head means including a head for recording said data or reproducing said recorded data on or from an addressed track of said tracks; a control circuit for producing a first track-addressing signal to drive said head to a position corresponding to said addressed track; and speed control means for controlling the rotational speed of said motor; wherein said speed control means comprises: track number-speed conversion means coupled to said control circuit, said conversion means receiving from said control circuit a second track-addressing signal corresponding to said first track-addressing signal for producing a rotational speed instruction signal in response to said second track-addressing signal; speed detecting means for obtaining a rotational speed signal of said motor; control means for receiving said rotational speed signal and said rotational speed instruction signal, and for controlling the rotational speed of said motor by driving said motor at a rotational speed which is predetermined according to said addressed track.
Claim 2
Dependent Claim
189 words
A rotatable memory disk apparatus comprising: a rotatable memory disk having a plurality of tracks on which data are recorded or from which the recorded data are reproduced; a motor for rotating said memory disk; head means including a head for recording said data or reproducing said recorded data on or from an addressed track of said tracks; a control circuit for producing a first track-addressing signal to drive said head to a position corresponding to said addressed track; and speed control means for controlling the rotational speed of said motor; wherein said speed control means comprises: track number-speed conversion means coupled to said control circuit, said conversion means receiving from said control circuit a second track-addressing signal corresponding to said first track-addressing signal for producing a rotational speed instruction signal in response to said second track-addressing signal; speed detecting means for obtaining a rotational speed signal of said motor; control means for receiving said rotational speed signal and said rotational speed instruction signal, and for controlling the rotational speed of said motor by driving said motor at a rotational speed which is predetermined according to said addressed track.
Claim 3
Dependent Claim
132 words
A rotatable memory disk apparatus according to claim 1, wherein said control means comprises: an oscillator which receives said rotational speed instruction signal to produce an output signal having a frequency corresponding to said rotational speed instruction signal; a phase locked loop circuit which receives the output signal of said oscillator and said rotational speed signal of said speed detecting means for producing an output signal having a frequency N times the output frequency of said oscillator, N being predetermined according to said addressed track; a phase compensating circuit for compensating the phase of the output signal of said phase locked loop circuit; and a hall element which is driven by the output signal of the phase compensating circuit, said hall element being used for controlling the rotational speed of said motor.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |