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Device for generating a signal

  • US 8,538,546 B2
  • Filed: 03/09/2012
  • Issued: 09/17/2013
  • Est. Priority Date: 04/28/2006
  • Status: Active Grant
First Claim
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1. A device for generating a prescribed signal, comprising:

  • an electrode configured to be supplied with a first voltage from an external power source, the external power source being outside the device, when the device is connected to the external power source;

    a signal generating unit having a plurality of terminals, the plurality of terminals including a first terminal, wherein the signal generating unit is configuredto decide whether to operate the device according to a size of a second voltage applied to the first terminal, andto output a prescribed signal, the prescribed signal being an AC signal having a frequency over a reference frequency, according to the decision; and

    a control circuit configured to control the second voltage, to output the controlled second voltage to the first terminal, and to control the prescribed signal to be outputted via the electrode, according as whether the first voltage is supplied via the electrode from the external power source.

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