Optical pickup device having a detector for detecting the light

Details Optical pickup device having a detector for detecting the light Optical pickup device having a detector for detecting the light

1986-03-03

1988-01-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 44, G01J 120, G11B 700

Patent

active

047218509

ABSTRACT:
This invention relates to an optical pickup device using a semiconductor light emitting element provided with a light emitting mode change detecting means or the like.

REFERENCES:
patent: 4074085 (1978-02-01), Russell
patent: 4346471 (1982-08-01), Hirasawa et al.
patent: 4518854 (1985-05-01), Hutchin
patent: 4621352 (1986-11-01), Kato

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