Hitachi, Ltd.

Takamitsu Kamiyama

Mikio Ashikawa

Norio Koike

In a scanning circuit having a plurality of cascade-connected unit circuits driven only by direct current, each unit circuit consisting of at least a pair of polarity inverting circuits, a train of output pulses shifted by a constant delay one after another depending upon the delay time proper to the unit circuits, are derived from the unit circuits by applying an input pulse to the first stage of the scanning circuit.

Scanning circuit to deliver train of pulses shifted by a constant delay

In an image sensor having a large scale array of semiconductor photodetectors, only the noise component is delivered from a first photodetector subsequent to the readout of a stored signal, in synchronism with the readout of a signal of a second photodetector, so that the noise component may be utilized for the cancellation of the noise component in the output from the second photodetector.

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Kodaira, Japan

Takamitsu Kamiyama