Touch sensing apparatus

Details Touch sensing apparatus Touch sensing apparatus

2007-01-30

2007-01-30

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S686000, C341S033000

Reexamination Certificate

active

11308892

ABSTRACT:
A touch sensing apparatus includes a signal source for generating an alternating current signal, a conductor connected to the signal source, a sensor for receiving a noise generated by a contact of an object. The sensor together with the conductor form a simulated capacitor that results in alternating current signal flowing through the sensor when the sensor is contacted by the object. A detector has a first input end and a second input end. The detector results in voltage differences between the first and second input ends thereof when receiving the alternating current signal output from the sensor, and thus output a signal. A rectifying circuit is used for rectifying the alternating current signal generated by the signal source and simultaneously generating a noise. One end of the rectifier circuit is connected to the signal source and other end of the rectifier circuit is connected to the negative power input end of the detector.

REFERENCES:
patent: 4289980 (1981-09-01), McLaughlin
patent: 5495077 (1996-02-01), Miller et al.
patent: 5783875 (1998-07-01), Jaros
patent: 6534970 (2003-03-01), Ely et al.
patent: 6545614 (2003-04-01), Kasai
patent: 2003/0030570 (2003-02-01), Netzer

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