Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-10-09
1987-10-13
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250238, G01J 132
Patent
active
047000570
ABSTRACT:
An optical power stabilizing device for use in an optical information recording and reproducing apparatus is disclosed. The device comprises a light source for generating a light output power having a non-linear characteristic to a driving current or voltage thereof, a light detection circuit coupled to the light source for detecting a part of the output light to generate an electric signal, a signal treating circuit connected to the light detection circuit for treating the detected electric signal, a compension circuit connected to the signal treating circuit for compensating the current or voltage to be supplied to the light source in accordance with the temperature variation, and a control circuit connected to the signal treating circuit and the compensation circuit for controlling the current or voltage to be supplied to the light source.
REFERENCES:
patent: 3872301 (1975-03-01), Joppich
patent: 4025440 (1977-05-01), Suga
patent: 4307469 (1981-12-01), Casper et al.
patent: 4369525 (1983-01-01), Breton et al.
patent: 4537510 (1985-08-01), Takahasi
Burns Robert E.
LaRoche Eugene R.
Lobato Emmanuel J.
Mis David
Olympus Optical Company Limited
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