Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-12-20
1988-08-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
35821311, 358212, 357 75, 357 30, H03F 1700
Patent
active
047630078
ABSTRACT:
An image sensor driving circuit of the matrix driving type includes a plurality of sensor elements for converting light image information into an electrical image signal, an operational amplifier circuit section for amplifying the electrical image signal and a logic circuit section for controlling the operation of the amplifier circuit section. In one embodiment, the amplifier circuit section includes a single stage operational amplifier having a pair of series-connected feed-back resistors and a trimmer capacitor connected between the interconnection between the feed-back resistors and ground, which allows to eliminate the differential signal component arising from the parasitic capacitance of the sensor element. In another embodiment, the operational amplifier is provided with an input offset compensation circuit which supplies a compensation voltage opposite in polarity to the input offset voltage of the operational amplifier, thereby preventing crosstalk from occurring. In a further embodiment, the image sensor includes an analog circuit section having an operational amplifier circuit and a logic circuit section which are mounted on separate substrates.
REFERENCES:
patent: 4079422 (1978-03-01), Anagnostopoulos
patent: 4227155 (1980-10-01), Lerma
patent: 4288841 (1981-09-01), Gogal
patent: 4354162 (1982-10-01), Wright
patent: 4371912 (1983-02-01), Guzik
patent: 4464630 (1984-08-01), Eddins
patent: 4470020 (1984-09-01), Mohr
patent: 4525921 (1985-07-01), Carson et al.
Ricoh & Company, Ltd.
Westin Edward P.
Wieland Charles
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