Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1996-04-23
1999-06-22
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214R, 372 29, 372 38, G02F 101, H01S 310
Patent
active
059144840
ABSTRACT:
Luminous energy of a light-emitting element in an optical device is adjusted to a desired level by a light adjusting circuit including a light-receiving element adapted to detect the level of luminous energy of light emitted from the light-emitting element, an up/down counter circuit for counting clock signals up or down according to the level detected by the light-receiving element, and a current adjusting circuit for resetting the current intensity supplied to the light-emitting element according to output data from the up/down counter circuit.
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Horowitz et al., The Art of Electronics, 2nd Ed., 1989, pp. 616-617.
Koharagi Yoshitaka
Tawarayama Hideki
Lee John R.
Rohm & Co., Ltd.
Westin Edward P.
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