Exposure controlling apparatus for electronic still camera

Details Exposure controlling apparatus for electronic still camera Exposure controlling apparatus for electronic still camera

1989-09-11

1991-01-08

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, H04N 314

Patent

active

049840886

ABSTRACT:
An exposure controlling apparatus provided for an electronic still camera using an imaging device, such as a CCD, controls an exposure with high accuracy even if a low-accuracy external photometric device or a low-accuracy diaphragm mechanism is used. The apparatus includes a first photometric component for metering the brightness of a subject and outputting a first photometric value, and automatic setting component for automatically setting either an aperture value or a shutter speed, depending on the first photometric value, an imaging device having matrix light receiving elements for effecting photoelectric conversion, and an electronic shutter for controlling charge accumulation time, depending on the set shutter speed. A diaphragm component adjusts a bundle of incident rays on a light receiving surface of the imaging device so a set aperture value will be attained, and a second photometric device effects the preliminary photography at an aperture value and shutter speed set by controlling the electronic shutter and the diaphragm component. The total amount of charges accumulated in all, or a predetermined number, of the light receiving elements of the imaging device are detected, and a second photometric value is outputted that is proportional to the total amount of charge. A shutter speed correcting device is provided for correcting exposure error.

REFERENCES:
patent: 4635126 (1987-01-01), Kinoshita
patent: 4675738 (1987-06-01), Okino et al.
patent: 4734777 (1988-03-01), Okino et al.
patent: 4742369 (1988-05-01), Ishii et al.
patent: 4868667 (1989-09-01), Tani et al.

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