Auxiliary light source for camera having automatic focusing devi

Details Auxiliary light source for camera having automatic focusing devi Auxiliary light source for camera having automatic focusing devi

1986-04-29

1987-09-15

Hix, L. T.

3541451, 354413, G03B 300, G03B 700

Patent

active

046935827

ABSTRACT:
An auxiliary light source for a camera having an automatic focusing device as an adapter attachable to a shoe part of the camera and which inhibits light measuring action during an auxiliary light emitting action for always obtaining accurate light measurement. The arrangement solves the following problems. In a camera of this type, the output of an automatic focusing sensor becomes too low for automatic focusing when automatic focusing is to be carried out under low light conditions. Systems contrived by the prior art to solve this problem have an auxiliary light source disposed within the camera for illuminating an object to be photographed during automatic focusing. However, since the auxiliary light source device is included within the camera, the auxiliary light is not effectively utilizable when a large lens such as a telephoto lens is used, since the auxiliary light is eclipsed by the lens barrel. Furthermore, when a light measuring circuit is operated during illumination by an auxiliary light, the light measurement output obtained for control would be affected by the illumination light making accurate light measurement almost unobtainable.

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