Image sensing device and method of adjusting quantity of light

Details Image sensing device and method of adjusting quantity of light Image sensing device and method of adjusting quantity of light

1996-12-12

1999-06-01

Garber, Wendy

Television

Camera, system and detail

Solid-state image sensor

348229, 348296, 348364, H04N 314, H04N 5235

Patent

active

059092467

ABSTRACT:
In a frequency dividing circuit, a VD pulse is generated as a vertical synchronization signal on the basis of the bus clock inputted from an external circuit, while in the gate circuit, integral circuit, gate circuit and hold circuit, the frequency of bus clock is detected on the basis of the VD pulse. Moreover, in the PWM circuit, when the frequency of the bus clock is high or low, a shutter drive pulse having the width shorter or longer than that in the related art is generated, respectively. The electronic shutter driver closes the electronic shutter of the CCD imager (charges generated in the CCD imager are discharged) for the period corresponding to the shutter drive pulse. Thereby, the discharging period in the CCD imager is fixed to a constant period without relation to the frequency of the bus clock. Accordingly, an image having adequate luminance can be obtained by the so-called multi-scan type image sensing device.

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patent: 5638120 (1997-06-01), Mochizuki et al.

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