Object proximity detector and object position detector

Details Object proximity detector and object position detector Object proximity detector and object position detector

2011-05-17

2011-05-17

Nguyen, Ha Tran T (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S662000, C324S076480, C331S158000, C331S165000, C331S135000, C331S057000, C331S1160FE

Reexamination Certificate

active

07944217

ABSTRACT:
The present invention offers an object proximity detector and object position detector. The variation of frequency of an oscillator is used to detect the proximity of an object to a sensor plate. The dependence of the sensitivity of the detector on the area of the sensor plate is reduced by conducting the sensor plate to two capacitors in series. The conducting wire of the sensor plate can be flexible without causing error detection. In the sensor element of the sensor oscillator, a resistor is connected at one terminal of the sensor plate to form a high pass filter. A resistor and a capacitor are added to the sensor oscillator to form a low pass filter. The high pass filter is used to reduce the low frequency electromagnetic interference. The low pass filter is used to reduce the high frequency electromagnetic interference.

REFERENCES:
patent: 7023221 (2006-04-01), Lin

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