Proximity sensor and object detecting device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
May 1, 2003
app pub date -
Oct 30, 2002
filing date -
Oct 31, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
In a proximity sensor, in order that it is not affected by a cable length and an environment of a setting place or the like, and that it is extremely stable in operation, and that it can be used nearing in a maintenance-free state, there are included a detecting electrode arranged in an object detecting area and made of a metal plate formed like a plate; a charge system with a direct current power source; a discharge system with a current detecting unit; and a switch for alternately switching the charge system and the discharge system to the detecting electrode by a specified switching frequency, and an electrostatic capacity between a detected object and the detecting electrode is detected as current flowing in the discharge system.
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