| 摘要 |
PROBLEM TO BE SOLVED: To provide a detection sensor that suppresses changes of set detection sensitivity, and to provide its sensitivity adjustment method. SOLUTION: When coarse adjustment is executed for turning a sensitivity control knob 20 at a high speed, a threshold level is changed by an amount corresponding to the number k of times of detection for each prescribed period of time t. When fine adjustment for turning the sensitivity control knob 20 at a slow speed is performed, the threshold level is changed by a value X calculated by dividing the number k of times of detection with the second number n of times of reference for each prescribed period of time (t). When the control knob 20 is rotated at an extremely slow speed due to motor oscillation or the like, it is composed so as to prevent a threshold from being changed even if the control knob 20 is turned. COPYRIGHT: (C)2008,JPO&INPIT
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