Control circuit for active type range finder

Details Control circuit for active type range finder Control circuit for active type range finder

1983-01-10

1985-02-05

Hix, L. T.

354404, G01C 308, G03B 310

Patent

active

044975600

ABSTRACT:
An active type range finder has a light-emitting element which is pulsatively driven to project light pulses on an object to be photographed. A photodetector element receives the light reflected from the object and produces a photoelectric output signal proportional to the amount of received light. A light-shielding member is scanned over the light-sensitive surface of the photodetector element in correlation with the distance to the object so that the light-shielding member successively shields successive areas of the light-sensitive surface from receiving light. An a.c. amplifier amplifies the photoelectric output signal, and an integrating circuit integrates the amplified photoelectric output signal and produces an integrated d.c. signal having a negative peak value indicative of the position of the scanning light-shielding member which corresponds to the object distance. Detecting circuitry detects the negative peak value and provides a corresponding detection signal indicative of the object distance.

REFERENCES:
patent: 4291223 (1981-09-01), Sakane et al.
patent: 4304487 (1981-12-01), Odone et al.

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