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1. 发明专利

JPH03179912A HIGH FREQUENCY OSCILLATION TYPE PROXIMITY SWITCH 失效
公开(公告)号：JPH03179912A
公开(公告)日：1991-08-05
申请号：JP31922789
申请日：1989-12-08
申请人： YAMATAKE HONEYWELL CO LTD
发明人： SUZUKI SHINICHIRO , AIMONOYA HISASHI
IPC分类号： H03K17/945
摘要： PURPOSE:To prevent a proximity switch damaged by using an oscillation circuit whose oscillation amplitude is changed in analog fashion corresponding to the position of a body to be detected, discriminating the level of the integral voltage of an integration circuit connected to the oscillation circuit, and informing deviation from a preset position by issuing output corresponding to each level. CONSTITUTION:The oscillation amplitude of the oscillation circuit 2 is decreased gradually as the body 3 to be detected approaches an induction plane 11. When the body 3 to be detected arrives at specific distance for the induction plane 11, an operation display element on one side i.e., a red light emitting diode 14a is lit with a display element driving circuit 13, then, the arrival of the body 3 to be detected at the operation start distance of the proximity switch 10 is displayed. Next, when the body 3 to be detected approaches an induction plane 11 side from the above state, the amplitude of the oscillation circuit 2 i.e., the integral voltage of the integration circuit 4 is decreased gradually. When the body 3 to be detected arrives at a stable operation start position for the induction plane 11, the display element driving circuit 13 lights a green light emitting diode 14b, and displays the fact that the distance between the body 3 to be detected and the induction plane 11 is appropriate.

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