Optical disk player having reduced laser output during track cha

Details Optical disk player having reduced laser output during track cha Optical disk player having reduced laser output during track cha

1985-03-22

1987-04-21

Cardillo, Raymond F.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 54, 369 58, 369116, 250205, G11B 2736, G11B 700

Patent

active

046601899

ABSTRACT:
This invention relates to an optical disk recording and reproducing apparatus for recording a predetermined signal on and/or reproducing the same from a writable disk which is rotated at a constant linear velocity by using a laser from a laser source. In this case, upon reproducing the above-described signal, if a signal recorded on the inner periphery of the disk is accessed, during the period from this addressing up to the time when the linear velocity at the inner periphery of the disk becomes constant, on the basis of a spindle lock signal, the beam power of the laser from the laser source and irradiating the disk is decreased to thereby prevent useless data from being rewritten on the disk.

REFERENCES:
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patent: 4283785 (1981-08-01), Miyauchi et al.
patent: 4328506 (1982-05-01), Yoshida et al.
patent: 4380015 (1983-04-01), Ito et al.
patent: 4417179 (1983-11-01), Fujimura et al.
patent: 4419750 (1983-12-01), Howe
patent: 4426693 (1984-01-01), Satoh et al.
patent: 4507767 (1985-03-01), Takasugi
patent: 4509156 (1985-04-01), Ohara et al.
patent: 4516235 (1985-05-01), Tarzaiski
patent: 4549190 (1985-10-01), Ohara

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