US 4,788,595 AGranted

Image sensor driving circuit

AssigneesRicoh Company, Ltd., Tohoku Ricoh Co., Ltd.

InventorsMasayuki Tamada, Junichi Takahashi

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Abstract

An image sensor driving circuit for driving an image sensor by applying a voltage thereto comprises a voltage supplying circuit for supplying a positive or negative polarity voltage to the image sensor responsive to a control signal, a converting circuit for converting an output photocurrent of the image sensor into a detection voltage, an inverting circuit for inverting the detection voltage responsive to the control signal, and a control circuit for generating the control signal. The control signal has a predetermined period so that the voltage supplying circuit alternately supplies the positive and negative polarity voltages with the predetermined period and the inverting circuit inverts the detection voltage only during one of first and second halves of each period of the control signal.

Claims6

Dependent claims

An image sensor driving circuit for driving an image sensor by applying a voltage thereto, said image sensor driving circuit comprising:

voltage supplying means for supplying one of a positive polarity voltage and a negative polarity voltage to said image sensor responsive to a control signal;
converting means for converting an output photocurrent of said image sensor into a detection voltage;
inverting means for inverting the detection voltage responsive to the control signal;
and
control means for generating the control signal, said control signal having a predetermined period so that said voltage supplying means alternately supplies the positive polarity voltage and the negative polarity voltage with the predetermined period and said inverting means inverts the detection voltage only during one of first and second halves of each period of the control signal.

2 more elements

Dependencies are inferred from the claim text.