Importance

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Abstract

Binary information of input signal obtained from positions separated spatially or in point of time, e.g., image pick-up signals from an image sensor can be obtained with high accuracy by a simple circuit configuration. A circuit therefor can be implemented as on-chip configuration within the image sensor. A first comparator set so that a potential on the + terminal is caused to be higher than a potential on the - terminal by voltage V1, a second comparator set so that a potential on the + terminal is caused to be lower than a potential on - terminal by voltage V2, and a JK flip-flop circuit are arranged. One of two signal output sections having quantities of delays different from each other of the final stage in charge transfer section is connected to respective + terminals of the two comparators, the other signal output section is connected to respective - terminals of the two comparators, inverting Q terminal of the first comparator and J terminal of JK flip-flop circuit are connected, and Q terminal of the second comparator and K terminal of JK flip-flop circuit are connected. Thus, binary circuit suitable for, e.g., binarization of output information of an image sensor of a CCD image pick-up apparatus for a bar code reader is provided.

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First Claim