Rangefinder for camera

Details Rangefinder for camera Rangefinder for camera

1989-06-22

1991-04-16

Perkey, W. B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 1, G03B 300, G01C 308

Patent

active

050086952

ABSTRACT:
An active rangefinder for use in a camera. The rangefinder has a light-emitting device, a spot light position detector disposed at a given distance from the light-emitting device, head amplifiers, filters having amplification function, synchronous detectors, integrators, an adder, a subtracter, a microcomputer, and an automatic gain control (AGC). The filters are connected to their respective head amplifiers each having an operational amplifier. The gains of the filters are controlled by the AGC according to the output signals from the synchronous detectors.

REFERENCES:
patent: 4673274 (1987-06-01), Nagaoka et al.
patent: 4761546 (1988-08-01), Ikari et al.

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