Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1988-07-27
1990-06-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354403, 356 4, G01V 120
Patent
active
049356135
ABSTRACT:
A distance measuring apparatus has a light projector unit for generating a plurality of light pulses at predetermined intervals and for projecting them upon an object, and a light receiving unit for receiving the light reflected by the object and outputting a photoelectrically converted signal. A photoelectrically converted signal generated in response to at least a first light pulse of said light pulses is inputted to a comparator wherein it is compared with a predetermined voltage to judge which is larger. The gain of an amplifier or the light emission intensity of the light projector unit is adjusted in accordance with the signal level judged. After adjustment, the light pulses of principal emission following the pre-emission are projected and the reflected light pulses are photoelectrically converted by the light receiving unit. The photoelectrically converted signal of each light pulse is amplified by the amplifier and thereafter integrated. The position of a taking lens is calculated in accordance with the integrated value.
REFERENCES:
patent: 4429967 (1984-02-01), Tokuda et al.
patent: 4642451 (1987-02-01), Tsunekawa et al.
patent: 4673274 (1987-06-01), Nagaoka et al.
patent: 4758082 (1988-07-01), Kozuki et al.
patent: 4768876 (1988-09-01), Okino
Ishiguro Minoru
Takahashi Minoru
Fuji Photo Film Co. , Ltd.
Nelms David C.
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