Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-10-09
1987-09-08
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
G01J 132
Patent
active
046926062
ABSTRACT:
An optical power stabilizing device for use in information recording and reproducing apparatus is disclosed. The device comprises a light source for generating light power in accordance with input signals, a photodetecting means coupled to the light source for detecting at least a part of the light power of the light source to generate a photodetected signal, a signal source for generating the input signals, an external control means connected to the signal source for selecting modes of the input signals, means for generating a control reference signal by processing the input signals, means for generating at least one control signal by processing the photodetected signal and the control reference signal, and means for driving the light source in accordance with the control signals.
REFERENCES:
patent: 4307469 (1981-12-01), Casper et al.
patent: 4369525 (1983-01-01), Breton et al.
Sakai Mitsugu
Yoshikawa Shoji
Burns Robert E.
LaRoche Eugene R.
Lobato Emmanuel J.
Mis David
Olympus Optical Company
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