Photographic device and control method therefor
First Claim
1. A photographic device comprising:
- an image sensor having a function of an electronic shutter that gives effect to charging from when electronic shutter pulses stop being input in said image sensor;
a drive device generating drive signals including said electronic shutter pulses for driving said image sensor in predetermined frame periods, said electronic shutter pulses being generated from the start of each frame period; and
a control device that selects from among different frame periods the shortest frame period of the different frame periods which permit charging during an exposure time for still image photography, as determined according to a subject brightness, decides timing of stopping inputting said electronic shutter pulses so as to provide said determined exposure time, and sets the selected shortest frame period and the decided timing in said drive device in response to a release signal entered to start photographing a still image.
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Accused Products
Abstract
There is disclosed a photographic device that uses an image sensor and an electronic viewfinder. When a release button is pressed halfway, an aperture value, an electronic shutter speed and a photosensitivity are decided based on the present subject brightness to provide a proper exposure value for photographing a still image. So long as the release button is kept being pressed halfway, a timing generator drives the image sensor to shoot video images at a frame rate of 20 Hz, and the aperture value decided for still image photography is fixed, whereas the electronic shutter speed and the photosensitivity are adjusted according to the subject brightness by use of an aperture-priority type video program. When the release button is pressed to the full, an exposure for a still image is done with the fixed aperture value.
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Citations
4 Claims
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1. A photographic device comprising:
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an image sensor having a function of an electronic shutter that gives effect to charging from when electronic shutter pulses stop being input in said image sensor; a drive device generating drive signals including said electronic shutter pulses for driving said image sensor in predetermined frame periods, said electronic shutter pulses being generated from the start of each frame period; and a control device that selects from among different frame periods the shortest frame period of the different frame periods which permit charging during an exposure time for still image photography, as determined according to a subject brightness, decides timing of stopping inputting said electronic shutter pulses so as to provide said determined exposure time, and sets the selected shortest frame period and the decided timing in said drive device in response to a release signal entered to start photographing a still image. - View Dependent Claims (2, 3)
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4. A control method for a photographic device using an image sensor having a function of an electronic shutter wherein electronic shutter pulses are input in said image sensor from the start of each frame period, and effective charging in said image sensor starts from when said electronic shutter pulses stop being input, said control method comprising steps of:
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determining an exposure time for still image photography according to a subject brightness; selecting from among different frame periods the shortest frame period of the different frame periods which permit charging during said exposure time; deciding timing of stopping inputting said electronic shutter pulses so as to provide said exposure time; and photographing a still image in the selected shortest frame period and the decided timing in response to a release signal.
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Specification