High signal to noise ratio optical image reader

Details High signal to noise ratio optical image reader High signal to noise ratio optical image reader

1986-05-20

1988-03-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358167, 35821315, H01L 2714, H04N 530

Patent

active

047330970

ABSTRACT:
An optical image reader includes plural pairs of switches, each pair of switches having a CMOS structure signal switch and a CMOS structure dummy switch, plural photosensing elements each corresponding to each pair of switches, plural inverters each corresponding to each pair of switches, a signal line, a dummy line, a shift register and a differential amplifier. A first switch terminal of each signal switch is connected to the corresponding photosensing element, and a second switch terminal thereof is connected to one input terminal of the differential amplifier through the signal line. A first switch terminal of each dummy switch is connected to another input terminal of the differential amplifier through the dummy line, and a second switch terminal thereof is in an open state. A first control terminal of each signal switch is connected to a first control terminal of corresponding each dummy switch, an input terminal of the corresponding inverter, and a corresponding output terminal of the shift register. A second control terminal of each signal switch is connected to a second control terminal of the corresponding dummy switch and an output terminal of the corresponding inverter. By applying a scanning pulse to each pair of switches for switching them from the shift register, an output of a photo signal and a spike noise appears on the signal line, and an output of a spike noise appears on the dummy line. These outputs are differentially amplified by the differential amplifier.

REFERENCES:
patent: 4045817 (1977-08-01), Nakatani et al.
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4300163 (1981-11-01), Wada et al.
patent: 4511804 (1985-04-01), Ozawa

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