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US 2007/0182717 A1Published application
Touch-sensitive pushbutton switch
AssigneeDiehl AKO Stiftung & Co. KG
InventorGeorg Arnold
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Abstract
A touch-sensitive pushbutton switch includes an optical sensor, in particular an infrared sensor, and an evaluation circuit. The evaluation circuit is able, through the use of a reference device, to set a sensitivity of the optical sensor in dependence on a detected basic level of an evaluation signal.
Claims7
A touch-sensitive pushbutton switch, comprising:
- a covering being at least partly transmissive to electromagnetic radiation;
- an optical sensor disposed behind said covering and having an electromagnetic-radiation-emitting transmitter and an electromagnetic-radiation-receiving receiver;
- an evaluation circuit for evaluating a measurement signal generated by said receiver and generating an evaluation signal;
- and
- a reference device for conducting part of the electromagnetic radiation emitted by said transmitter to said receiver even without actuation of the pushbutton switch, and generating a basic level of the evaluation signal;
- said evaluation circuit setting a sensitivity of the optical sensor in dependence on a detection of the basic level of the evaluation signal.
3 more elements
Dependencies are inferred from the claim text.