Focus detecting device utilizing auxiliary illumination

Details Focus detecting device utilizing auxiliary illumination Focus detecting device utilizing auxiliary illumination

1990-11-05

1992-09-22

Perkey, W. B.

G03B 1336

Patent

active

051501465

ABSTRACT:
A focus detecting device for a camera utilizing auxiliary illumination, comprises a sensor for detecting the image of a photographic object, a first light emitter for projecting a first auxiliary light toward the object, a second light emitter for projecting a second auxiliary light toward the object. The second auxiliary light illuminates a smaller area than the first auxiliary light. The first and second light emitters are selectively driven in response to brightness of the object, thereby to produce a contrasty light image onto the object.

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patent: 4764786 (1988-08-01), Tamura et al.
patent: 4843415 (1989-06-01), Matsui et al.

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