Distance measuring apparatus for camera, which controls outputs

Details Distance measuring apparatus for camera, which controls outputs Distance measuring apparatus for camera, which controls outputs

1991-09-12

1993-02-02

Perkey, W. B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 1, G03B 1336, G01C 308

Patent

active

051841681

ABSTRACT:
A distance measuring apparatus for a camera includes a light-emitting element array having a plurality of light-emitting elements, and an optical position detection element having a plurality of electrodes. The distance measuring apparatus selects two of the plurality of electrodes of the optical position detection element. The apparatus further includes a plurality of preamplifiers respectively connected to the plurality of electrodes, a control unit for performing high-impedance control, low-impedance absorption control, and low-impedance amplification control of the plurality of preamplifiers in accordance with the selected and nonselected states of the plurality of electrodes, and an arithmetic unit for calculating an object distance in accordance with a preamplifier output subjected to the low-impedance amplification control.

REFERENCES:
patent: 4615616 (1986-10-01), Shiomi
patent: 4849781 (1989-07-01), Nakazawa et al.

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