Electronic still camera and method of determining exposure time

Details Electronic still camera and method of determining exposure time Electronic still camera and method of determining exposure time

1987-12-30

1989-06-27

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358228, H04N 5238

Patent

active

048434744

ABSTRACT:
In an electronic still camera provided with a plurality of photosensitive pixels arranged on a two-dimensional plane, and transfer means for transferring charges produced in the photosensitive pixels, there is provided a method of precisely measuring a shutter speed at a relatively low cost. To the solid state image sensor, output terminals of the duplicate system are provided. The first terminal outputs signal charges for forming a pictorial image. The second terminal outputs signal charges for determining an exposure time. For a predetermined time after the shutter is opened, signal charges are output from the second terminal to thereby determine an exposure time. Subsequently, signal charges are output from the first terminal to form a pictorial image. At this time, only for an exposure time determined at the preceeding stage, the shutter is continuously opened to form a pictorial image. By allowing the solid state image sensor to have both the function to form a pictorial image and the function to measure an exposure time, the necessity of additionally providing an exposure meter is eliminated.

REFERENCES:
patent: 3934161 (1976-01-01), Caywood
patent: 4489350 (1984-12-01), Kimura
patent: 4516172 (1985-05-01), Miyata et al.
patent: 4556908 (1985-12-01), Ida
patent: 4573077 (1986-02-01), Imai

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