Auxiliary light emitting device and focusing condition detecting

Details Auxiliary light emitting device and focusing condition detecting Auxiliary light emitting device and focusing condition detecting

1997-05-27

1999-02-09

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Having auxiliary illumination

G03B 1336

Patent

active

058706372

ABSTRACT:
An auxiliary light emitting device used in a focusing condition detecting device having a plurality of sensors is provided. The light emitting device includes a light emitter, which projects light having a plurality of light patterns. A controller is provided to control the light emitter to project the plurality of light patterns selectively, or sequentially. Further, the focusing condition detecting device determines whether the auxiliary light pattern should be projected for each of the sensors. The light pattern is projected when the object corresponding to a sensor has low contrast and low brightness. The sensors are driven synchronously with the projection of the corresponding light pattern.

REFERENCES:
patent: 4688919 (1987-08-01), Ogawa et al.
patent: 4771308 (1988-09-01), Tejima et al.
patent: 4870442 (1989-09-01), Tejima et al.
patent: 4958180 (1990-09-01), Matsui et al.

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