Sensor device, and portable communiction terminal and...

Details Sensor device, and portable communiction terminal and... Sensor device, and portable communiction terminal and...

2009-10-13

2010-10-12

Nguyen, Hoai-An D (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S661000

Reexamination Certificate

active

07812620

ABSTRACT:
A sensor device for detecting a positional relationship between a first member and a second member, includes a first electrode provided on a surface of the first member and supplied with an alternating signal of a first frequency, a second electrode provided on a surface of the second member and supplied with an alternating signal of a second frequency, and a beat detector which detects a beat frequency component corresponding to a difference between the first and second frequencies indicative of the positional relationship between the first member and the second member, when the positional relationship between the first and second members changes to cause the first electrode to approach the second electrode.

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International Search Report dated Dec. 27, 2007 based on corresponding European Patent U.S. Appl. No. 07/018,734.

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