Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1994-06-15
1996-11-05
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502014, 396106, G03B 1336
Patent
active
055720129
ABSTRACT:
A distance measuring device for a camera projects a pulsed light beam toward a subject and converts the reflected light from the subject to a voltage which is integrated by an integrating circuit. The output of the integrating circuit is compared with a first reference voltage until the level thereof exceeds the first reference voltage, and then the output of the integrated circuit is compared with a second reference voltage until the level thereof reaches the second reference voltage. The distance to the subject is calculated depending on the number of times the integration operation is performed.
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Ito Akira
Saito Hiroyuki
Lee John R.
Seiko Precision Inc.
Westin Edward P.
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