Touch key and induction heating cooking device employing the...

Details Touch key and induction heating cooking device employing the... Touch key and induction heating cooking device employing the...

2005-10-06

2009-12-01

Robinson, Daniel L (Department: 3742)

Electric heating

Inductive heating

With heat exchange

C219S618000

Reexamination Certificate

active

07626148

ABSTRACT:
A touch key detects that an object touches the touch key. The touch key includes an electrode arranged to be touched with the object, an oscillator for outputting a high-frequency voltage and applies the high-frequency voltage to the electrode, a rectifier for rectifying and smoothing the high-frequency voltage output from the oscillator as to output a direct-current (DC) voltage, a reference voltage generator for generating a reference voltage, a subtracter for subtracting the reference voltage from the DC voltage output from the rectifier, a judging unit for detecting a voltage difference between the voltage output from the subtracter before and after changing and for determining that the object touches the electrode when the voltage difference exceeds a predetermined value. This touch key detects that an object touches the electrode with high sensitivity, and enhances the reliability of the judging unit.

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International Search Report for corresponding PCT International Application No. PCT/JP2005/018524 dated Nov. 29, 2005.
Supplementary European Search Report dated Feb. 5, 2009 for EP 05 79 0589.

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