Optical disc recording device having improved accuracy of pit fo

Details Optical disc recording device having improved accuracy of pit fo Optical disc recording device having improved accuracy of pit fo

1988-04-25

1991-03-05

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369 59, G11B 700

Patent

active

049982370

ABSTRACT:
An optical disc recording device comprises laser beam control means or 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. 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 and position to a predetermined position whereby blank length which is close to a set value can be obtained.

REFERENCES:
patent: 4873680 (1989-10-01), Chung et al.

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