Camera having television mode

Details Camera having television mode Camera having television mode

1990-10-04

1991-12-03

Adams, Russell E.

354 76, G03B 7097

Patent

active

050703560

ABSTRACT:
A camera having a television mode has a shutter unit for opening and closing a plurality of shutter blades used as a shutter and a diaphragm by rotating a step motor in normal and reverse directions; a photometric device for performing a photometric operation with respect to a photographed object; a mode switching device for selectively switching a television mode for photographing a picture image on a television screen and a normal mode for performing a normal photographing operation; a trigger switch for outputting an open signal in synchronization with an operation for opening the shutter blades and outputting a closed signal in synchronization with an operation for closing the shutter blades; and a calculator for calculating an exposure amount by photometric information provided by the photometric device when the normal photographing mode is selected by the mode switching device. The calculator converts the calculated exposure amount to a time from a generating time point of the open signal of the trigger switch to a time point of the reverse rotation of the step motor so as to control a program exposing operation with respect to the shutter unit. The calculator calculates the exposure amount by the photometric information provided by the photometric device when the television mode is selected.

REFERENCES:
patent: 4325614 (1982-04-01), Grimes
patent: 4354748 (1982-10-01), Grimes et al.
patent: 4494846 (1985-01-01), Kurosu et al.
patent: 4648701 (1987-03-01), Ogihara et al.
patent: 4708454 (1987-11-01), Kodaira et al.
patent: 4730202 (1988-03-01), Watanabe et al.
patent: 4978991 (1990-12-01), Farrington

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