Image sensor having dual shift registers and a plurality of capa

Details Image sensor having dual shift registers and a plurality of capa Image sensor having dual shift registers and a plurality of capa

1991-08-29

1993-08-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

35821318, H01J 4014

Patent

active

052351742

ABSTRACT:
An image sensor having a linear array of a plurality of photodetecting element groups each including a plurality of photodetecting elements each consisting of first and second photo diodes connected in series and oppositely in polarity, in which read pulses are applied sequentially to the second photo diodes of the photodetecting elements of each photodetecting element group by a matrix drive system, and image signals are read by a read circuit connected to the first photo diodes of the photodetecting elements. In the image sensor, first capacitor portions are connected to the second photo diodes of the photodetecting elements. A first shift register is connected to the first capacitor portions for each photodetecting element group. The first shift register sequentially applies drive pulses to the photodetecting element groups. Second capacitor portions are connected to the second photo diodes of the photodetecting elements. A second shift register is connected to the second capacitor portions in a matrix fashion. The second shift register sequentially applies read pulses to the respective photodetecting elements. A leak unit is coupled with the second photo diodes of the photodetecting elements.

REFERENCES:
patent: 4556800 (1985-12-01), Ohta et al.
patent: 4565928 (1986-01-01), Yamamoto et al.
patent: 5023443 (1991-06-01), Komatsu et al.
Ozawa, Kiyoshi et al., "Contact-Type Linear Sensor Using Amorphous Si Diode-Array", Japanese Journal of Applied Physics, vol. 22 (1983) Supplement 22-1, pp. 457-460.
Yamamoto, H. et al., "High Speed Contact Type Linear Sensor Array Using a-Si pin Diodes", 15th Conference on Solid State Devices and Material, Tokyo 1983 pp. 205-208.
Swartz, L. et al., "A High Speed High Resolution Contact Line Imager Using Amorphous Silicon Alloy Pin Diodes", MRS Proc. vol. 95 1987 1987 pp. 633-638.

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