Position sensor
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United States of America Patent
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Feb 4, 1997
Grant Date -
N/A
app pub date -
Oct 6, 1994
filing date -
Nov 25, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A position sensor for detecting a position by comparing a detected level with a threshold level. This operation is performed without being affected by the characteristics intrinsic to the used sensor means or by power supply variations. Furthermore, the operation is not varied even if the sensor means ages. The sensor means is caused to shift from a first operating state to an unoperated state and then to a second operating state according to operation of an object whose position should be detected. The level of the output from the sensor means is compared with a threshold level. Thus, the timing at which the sensor means shifts from the unoperated state to the second operating state is detected. The output level detected when the sensor means is in the first state is stored in a capacitor and divided by resistors to obtain the threshold level. Therefore, if the characteristics of the used sensor means deviate from ideal characteristics, or if power source variations occur, then the threshold level is automatically corrected. Consequently, the operation of the sensor means is not affected by these deviation and power source variations.
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