Patent US5142524A successfully refreshed from Google Patents.
US5142524A
Expired / Lapsed
US
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Optical recording medium
Assignee: CSK Corp
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Filing: 1988-07-06
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Granted: 1992-08-25
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Expires: 2008-07-06
Abstract
Abstract An optical recording medium having at least one data track and at least one clock track including clock bits provided in a predetermined optical pattern, in which the clock track comprises regular, periodical clock bits arranged regularly in a line and at least one irregular clock bit disposed in the line, breaking the regularity of the periodical clock bits. When a PLL circuit is reinstated into a locked state after it has been unlocked, a leading word can be identified by the irregular clock bit provided in the clock track. This enables data reading thereafter to be accurate.
Inventors
- 👤 Kiyoshi Horie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:58
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
An optical recording medium having a surface provide with a clock track having a plurality of clock bits and a data track section having a plurality of data bits arranged in a line, and the clock bits and data bits being arranged in parallel on said surface so that a plurality of data tracks are read simultaneously by each of the clock bits, and said clock track including irregular clock bits for leading words, at least one leading word being intermediate said line.
Claim 2
Dependent Claim
83 words
An optical recording medium having a surface provide with a clock track having a plurality of clock bits and a data track section having a plurality of data bits arranged in a line, and the clock bits and data bits being arranged in parallel on said surface so that a plurality of data tracks are read simultaneously by each of the clock bits, and said clock track including irregular clock bits for leading words, at least one leading word being intermediate said line.
Claim 3
Dependent Claim
17 words
An optical recording medium according to claim 1, in which said clock track is a guide line.
Claim 4
Dependent Claim
30 words
An optical recording medium according to claim 1, in which the clock track consists of regular clock bits between said irregular clock bits arranged in a line at equal intervals.
References Cited (Backward Citations)
US4761775A
Cited
US4598393A
Cited
JPS61151792A
Cited
JPS61227232A
Cited
US4817067A
Cited
JPS63293771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |