Exposure control apparatus for use in camera

Details Exposure control apparatus for use in camera Exposure control apparatus for use in camera

1990-08-27

1991-05-28

Hix, L. T.

35414911, G03B 700

Patent

active

050198530

ABSTRACT:
Disclosed is an exposure control device for an automatic illumination adjustment controlled type camera in which flashing of a flash apparatus built in a camera body is automatically stopped. The exposure control device includes an exposure value calculating unit for calculating an exposure value on the basis of photometering of an object before an exposure operation is started, and an exposure value compensating unit for correcting the exposure value calculated by the exposure value calculating unit to a value which assures overexposure when a picture is taken using a flash. Also disclosed is a TTL automatic illumination adjusting type camera which has an illumination adjusting unit for receiving light coming from a flash, reflected by an object and incident through a lens, and for stopping the flashing of the flash apparatus when the amount of light received reaches an illumination adjusting level. The camera is capable of employing a plurality of electronic flash apparatuses having different flashing characteristics. The camera includes a recognizing unit for outputting a recognition signal when it recognizes the type of the electronic flash apparatus used, and a level setting device for setting the illumination adjusting level on the basis of the recognition signal, such that an object having the same luminance is illuminated by the same amount of light regardless of which one of the electronic flash apparatuses is used.

REFERENCES:
patent: 4159168 (1979-06-01), Sumi et al.
patent: 4415247 (1983-11-01), Takematsu

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