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Patent EP0289260A2 successfully refreshed from Google Patents.
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EP0289260A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical disc recording device

Assignee: Yamaha Corp
•
Filing: 1988-04-26
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Granted: —
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Expires: 2008-04-26
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Abstract

Abstract An optical disc recording device comprises laser beam control means (12, 13, 14) of a mark length recording type which records data by forming pits on an optical disc (11) by radiation of laser beam for periods of time corresponding to pit lengths of respective pits. The laser beam control means shortens radiation time of laser beam as pit length of a pit to be formed increases. The laser beam control means also shortens radiation time of laser beam as immediately preceding blank length of a pit to be formed decreases. The shortening of the radiation time cancels tendency to increasing of pit length whereby a pit of pit length which is close to a set value can be formed. In one aspect of the invention, the laser beam control means advances starting of radiation of laser beam as immediately preceding blank length of a pit to be formed increases. The advancing of starting of radiation of laser beam enables adjusting of a pit starting end position to a predetermined position whereby blank length which is close to a set value can be obtained.

Inventors

  • 👤 Katsuichi Osakabe
  • 👤 Yoshiaki Suzuki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 20:21
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B7/24; G11B7/2407; G11B7/24085

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 63 words
An optical disc recording device comprising laser beam control means of a mark length recording type which records data by forming pits on an optical disc by radiation of laser beam for periods of time corresponding to pit lengths of respective pits, said laser beam control means shortening radiation time of laser beam as pit length of a pit to be formed increases.
Claim 2
Dependent Claim 63 words
An optical disc recording device comprising laser beam control means of a mark length recording type which records data by forming pits on an optical disc by radiation of laser beam for periods of time corresponding to pit lengths of respective pits, said laser beam control means shortening radiation time of laser beam as pit length of a pit to be formed increases.
Claim 3
Dependent Claim 65 words
An optical disc recording device comprising laser beam control means of a mark length recording type which records data by forming pits on an optical disc by radiation of laser beam for periods of time corresponding to pit lengths of respective pits, said laser beam control means shortening radiation time of laser beam as immediately preceding blank length of a pit to be formed decreases.
Claim 4
Dependent Claim 65 words
An optical disc recording device comprising laser beam control means of a mark length recording type which records data by forming pits on an optical disc by radiation of laser beam for periods of time corresponding to pit lengths of respective pits, said laser beam control means shortening radiation time of laser beam as immediately preceding blank length of a pit to be formed decreases.
Claim 5
Dependent Claim 66 words
An optical disc recording device comprising laser beam control means of a mark length recording type which records data by forming pits on an optical disc by radiation of laser beam for periods of time corresponding to pit lengths of respective pits, said laser beam control means advancing starting of radiation of laser beam as immediately preceding blank length of a pit to be formed increases.
Claim 6
Dependent Claim 66 words
An optical disc recording device comprising laser beam control means of a mark length recording type which records data by forming pits on an optical disc by radiation of laser beam for periods of time corresponding to pit lengths of respective pits, said laser beam control means advancing starting of radiation of laser beam as immediately preceding blank length of a pit to be formed increases.

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