Copyer Co., Ltd.

Yutaka Takata

Yuichi Sugiyama

Michitaka Fukuda

An ink-jet image forming device such that the test pattern detecting accuracy is improved with a single photodetector. A binarizing circuit ( ) which binarizes the output of a sensor for a test pattern includes a peak hold circuit ( ) which follows slow change in the sensor output, a voltage dividing circuit ( ) which divides the held output, and a comparator ( ) which converts the sensor output into a bi-level signal by using the output of the circuit ( ) as a threshold.

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Tokyo, Japan

Yutaka Takata