US4942567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk reproducing method
Assignee: Pioneer Corp
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Filing: 1988-02-26
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Granted: 1990-07-17
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Expires: 2008-02-26
Abstract
Abstract A disk reproducing method, such as may be used with a compact disk or video disk, in which playing can be quickly restored following track flow caused, for example, by an external shock applied to the player. The disk is rotated with a spindle motor, the rotation of which is controlled with a first servo circuit. Data recorded on the disk is reproduced with a pickup. Tracking of the pickup is controlled with a second servo circuit. The pickup is driven with a slider motor radially of the disk. Rotation of the slider motor is controlled with a third servo circuit. When the first servo circuit is maintained unlocked for a predetermined period of time, the second and third servo circuits are turned off for a predetermined period of time, and then turned back on.
Inventors
- 👤 Takahumi Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:14
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0946
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A disk reproducing method, comprising the steps of: rotating a disk with a spindle motor; controlling the rotation of said spindle motor with a first servo circuit; reproducing data on said disk by tracking said disk with a pickup; controlling the tracking of said pickup with a second servo circuit wherein said tracking is controlled by adjusting a gain of said second servo circuit; driving said pickup with a slider motor radially of said disk; controlling the rotation of said slider motor with a third servo circuit, said rotation being controlled by adjusting said third servo circuit in communication with said second servo circuit; and when said first servo circuit is maintained at other than a predetermined speed for a first predetermined period of time, turning off said second and third servo circuits for a second predetermined period of time and then turning said second and third servo circuits back on.
Claim 2
Dependent Claim
151 words
A disk reproducing method, comprising the steps of: rotating a disk with a spindle motor; controlling the rotation of said spindle motor with a first servo circuit; reproducing data on said disk by tracking said disk with a pickup; controlling the tracking of said pickup with a second servo circuit wherein said tracking is controlled by adjusting a gain of said second servo circuit; driving said pickup with a slider motor radially of said disk; controlling the rotation of said slider motor with a third servo circuit, said rotation being controlled by adjusting said third servo circuit in communication with said second servo circuit; and when said first servo circuit is maintained at other than a predetermined speed for a first predetermined period of time, turning off said second and third servo circuits for a second predetermined period of time and then turning said second and third servo circuits back on.
Claim 3
Dependent Claim
35 words
The disk reproducing method of claim 1, wherein said predetermined time is determined in accordance with an amount of time required for a moving part of a tracking actuator to return to a neutral point.
Claim 4
Dependent Claim
41 words
The disk reproducing method of claim 1, further comprising the steps of: following turning said second and third servo circuits back on, operating said second servo circuit in a braking mode while simultaneously increasing a gain of a tracking servo loop.
References Cited (Backward Citations)
US4761692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |