Solid state image sensor having variable charge accumulation tim

Details Solid state image sensor having variable charge accumulation tim Solid state image sensor having variable charge accumulation tim

1987-12-21

1989-06-13

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, 35821311, 357 30, H04N 314

Patent

active

048397350

ABSTRACT:
A solid state image sensor in which the charge accumulation period of each picture element can be set at the same point of time. Additionally, the lenngth of the charge period can be set at will, thus providing a video signal picture in which all picture elements bear image information with the same time reference. Sensitivity of the solid state image senosr can be adjusted by setting the length of charge accumulation period. In the solid state image sensor, photodiodes are disposed as picture elements, and video signal is output in accordance with a charge which is light-generated within respective photodiodes. A series circuit of a switch and a capacitance element is connected in parallel with the photodiode. The switch is closed for at least the charge accumulation period during which charge is light-generated within the photodiode, and the video signal is obtained in accordance with level of charging of said capacitance element.

REFERENCES:
patent: 3562418 (1971-02-01), Glusick et al.
patent: 4363963 (1982-12-01), Ando
patent: 4395736 (1983-07-01), Fraleux
patent: 4646155 (1987-02-01), Miyazawa et al.
patent: 4680477 (1987-07-01), Sato et al.
patent: 4682236 (1987-07-01), Wang et al.

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