Capacitance measuring apparatus and method, and program

Details Capacitance measuring apparatus and method, and program Capacitance measuring apparatus and method, and program

2007-04-17

2007-04-17

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S686000, C382S115000, C382S124000

Reexamination Certificate

active

11221108

ABSTRACT:
Whether a human body is touching or not is detected highly accurately at high speed. Switch SW1is turned on to charge condenser Ca by power supply Vcc. The switch SW1is turned off to transfer the electric charge charged in the condenser Ca to condensers Cs and Cx. The switches SW2and SW3are repeatedly turned on and off for a predetermined short time, and thus the electric charge charged in the condenser Ca is slowly discharged through resistor R. The unknown charging voltage Vx of the condenser Cx is compared with the reference voltage Vref by comparator Comp, and the unknown capacitance of the condenser Cx is computed based on the number of times to count turning on and off until it is smaller than the reference voltage Vref. When the computed unknown capacitance of the condenser Cx is the value near the capacitance of a human body, it is determined that a human body is touching. The invention can be applied to a touch sensor.

REFERENCES:
patent: 5073757 (1991-12-01), George
patent: 6438257 (2002-08-01), Morimura et al.
patent: 6555888 (2003-04-01), Lepert et al.
patent: 6583632 (2003-06-01), Von Basse et al.
patent: 6661239 (2003-12-01), Ozick
patent: 6681033 (2004-01-01), Yano et al.
patent: 7015705 (2006-03-01), Inaba et al.
patent: 7-318365 (1995-12-01), None
patent: 2002-530680 (2002-09-01), None

Affiliated with

Also associated with

Rating

Capacitance measuring apparatus and method, and program does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Capacitance measuring apparatus and method, and program, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitance measuring apparatus and method, and program will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3760837