| 摘要 |
An object being distance-measured is detected of its status change by a simple structure.A processing operating circuit 7 samples and stores outputs of a monitor cell 8 and compares between a value sampled in the last time and a value sampled in the present time. When a difference thereof is out of a predetermined range, it is determined that the state of a subject has changed due to movement or the like of the subject and the output of the monitor cell 8 has changed thus outputting a detection signal to a terminal D. A control-logic 12 causes a gate section 2 due to an input of the detection signal to forcibly end the storage operation of a line sensor section 1. Meanwhile, due to the detection signal outputted on the terminal D, an alarm section 14 gives alarm that the subject has moved.
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