Reading apparatus with improved performance

Details Reading apparatus with improved performance Reading apparatus with improved performance

1986-08-28

1989-01-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

35821315, 35821318, H01J 4014

Patent

active

047975610

ABSTRACT:
A parallel circuit which is composed of a plurality of series circuits connecting photodetectors to reading switches in series is connected to an input terminal of an operational amplifier. Both a feedback switch and a feedback capacitor are connected in parallel to the operational amplifier. The reading switches and the feedback switches are turned on/off alternately, and then an output of the operational amplifier associated with the operation of reading switches turned on is input to one of input terminals of a differential amplifier, and the output of the operational amplifier associated with the operation of the reading switches turned off is input to the other input terminal of the differential amplifier to obtain the reading signal with noise absorbed.

REFERENCES:
patent: 3949162 (1976-04-01), Malveg
patent: 4011442 (1977-03-01), Engeler
patent: 4079422 (1978-03-01), Anagnostopoulos
patent: 4413188 (1983-12-01), Ozawa et al.
patent: 4419696 (1983-12-01), Hamano et al.
patent: 4424590 (1984-01-01), Ozawa et al.
patent: 4495523 (1985-01-01), Ozawa
patent: 4511804 (1985-04-01), Ozawa
patent: 4556910 (1985-12-01), Tisue
patent: 4566040 (1986-01-01), Ozawa
patent: 4673821 (1987-01-01), Morita
Contact-Type Linear Sensor Using Amorphous Si Diode Array Japanese Journal of Applied Physics, vol. 22 (1983) Supp 22-1, pp. 457-460, Kiyoshi Ozawa, et al.
Amorphous Silicon Image Sensor Electronics Dec. 1982, pp. 59-62 (together with its partial English translation)-Takashi Ozawa.

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