Exposure controlling apparatus for electronic still camera

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

1988-09-23

1989-09-19

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, 358909, H04N 5235, H04N 579

Patent

active

048686670

ABSTRACT:
An exposure controlling apparatus is provided for an electronic still camera using an imaging device such as a CCD, and controls exposure with high accuracy even if a low-accuracy external photometric device or a low-accuracy diaphragm mechanism is used. The apparatus comprises a first photometric component for metering the brightness of a subject and outputting a first photometric value, an 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 imagining 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 charge accumulated in all, or a predetermined number, of the light receiving elements of the imagining device are detected, and a second photometric value has an output proportional to the total amount of charge. A shutter speed correcting device is provided for correcting exposure error.

REFERENCES:
patent: 4635126 (1987-01-01), Kingshita
patent: 4675738 (1987-06-01), Okino et al.
patent: 4675747 (1987-06-01), Hanma et al.
patent: 4714966 (1987-12-01), Saito et al.
patent: 4734777 (1987-06-01), Okino et al.
patent: 4742369 (1987-07-01), Ishii et al.

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