US4669075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disk control apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1985-02-01
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Granted: 1987-05-26
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Expires: 2005-02-01
Abstract
Abstract An optical disk control apparatus which makes it possible to record and play back the data of a sector when a sector signal representative of the start of the sector is missing. A timer detects an overtime in the time intervals between sector signals due to a missing sector signal due to a defect in an optical disk or the like. A one-shot circuit is provided to produce a simulation sector signal similar to the normal sector signals when an overtime is detected. A combining circuit is connected to receive either the normal sector signals or the simulation sector signals and delivers the signals to a control circuit so as to enable the control circuit to operate the apparatus continuously.
Inventors
- 👤 Minoru Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:14
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/02; G11B19/04; G11B20/00; G11B20/10; G11B20/18; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B7/00; G11B7/004; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
An optical disk apparatus for controlling recording and playback operations of an optical disk formed of sectors when sector signals representative of the start of said sectors and produced by an optical disk reader device are missing, said apparatus comprising: a control circuit for operating said apparatus upon receiving sector signals recorded on the sectors, a timer connected to receive sector signals from the optical disk reader device including means for detecting an overtime in the time intervals between the sector signals due to the omission of a sector signal and producing an output representative thereof, and a one-shot circuit for generating a simulation sector signal responsive to the output from said timer indicating a missing sector signal for delivery to the control circuit in place of the sector signal normally produced by the optical disk reader device.
Claim 2
Dependent Claim
138 words
An optical disk apparatus for controlling recording and playback operations of an optical disk formed of sectors when sector signals representative of the start of said sectors and produced by an optical disk reader device are missing, said apparatus comprising: a control circuit for operating said apparatus upon receiving sector signals recorded on the sectors, a timer connected to receive sector signals from the optical disk reader device including means for detecting an overtime in the time intervals between the sector signals due to the omission of a sector signal and producing an output representative thereof, and a one-shot circuit for generating a simulation sector signal responsive to the output from said timer indicating a missing sector signal for delivery to the control circuit in place of the sector signal normally produced by the optical disk reader device.
Claim 3
Dependent Claim
23 words
An optical disk control apparatus according to claim 1 wherein said timer detects an overtime with respect to the directly preceding sector signal.
Claim 4
Dependent Claim
28 words
An optical disk control apparatus according to claim 1 wherein said timer detects an overtime with respect to a sector signal which precedes the directly preceding sector signal.
Claim 5
Dependent Claim
59 words
An optical disk control apparatus according to claim 1 further including a combining circuit which normally receives the sector signal from the optical disk reader device and sends it to the control circuit and which, upon the generation of the simulation sector signal by said one-shot circuit, receives the simulation sector signal and sends it to the control circuit.
Claim 6
Dependent Claim
23 words
An optical disk control apparatus according to claim 4 wherein said timer detects an overtime with respect to the directly preceding sector signal.
Claim 7
Dependent Claim
28 words
An optical disk control apparatus according to claim 4 wherein said timer detects an overtime with respect to a sector signal which precedes the directly preceding sector signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |