Optical or magnetooptical information recording/reproducing appa

Details Optical or magnetooptical information recording/reproducing appa Optical or magnetooptical information recording/reproducing appa

1993-08-24

1995-08-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 54, G01J 120

Patent

active

054442338

ABSTRACT:
An optical information recording/reproducing apparatus includes a semiconductor laser having plural light emitting parts within a chip, so that plural light spots are formed on an information recording medium to effect recording/reproduction of information and focusing error signal detection, utilizing plural light beams emitted from the plural light emitting parts. Light spots other than a light spot for the focusing error signal detection are turned off until a focusing pull-in operation is completed.

REFERENCES:
patent: 5293366 (1994-03-01), Ohta
patent: 5295125 (1994-03-01), Oonishi et al.
Patent Abstracts of Japan, Abstract of Japanese Patent No. JP-A-61 142 538, vol. 10, No. 341, Publication Date: Nov. 18, 1986.

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