11-04-2013 дата публикации
Номер: US20130086997A1
A device for detecting the likelihood of the presence of at least one human finger on a surface, and a method of using the device in the user interface of a machine, device or system. The device comprises at least one element having piezoelectric characteristics, located under a surface, the element arranged in the device in such a manner that a force when exerted on the surface, such as when the surface is pressed by finger, is transferred to mechanical stress of the element, the element then producing a voltage output in response to the mechanical stress. Also included are means for measuring the voltage output in a predefined time period and means for determining the degree of stability of the measured voltage output, and configured to indicate whether or not the degree of stability shows that the measured voltage output is likely to be a human finger or not. 1110. A device () for detecting the presence of at least one human finger on a surface () , comprising:{'b': '22', 'claim-text': [{'b': 28', '25', '18', '14, 'comprising a layer () of piezoelectric material on a metallic base plate () arranged between a lower conductive layer () and an upper conductive layer ();'}, {'b': 10', '22', '12', '28', '29, 'being located under a unitary surface (), to which the element () has been attached by an adhesive layer () and which is visible and extends laterally beyond the layer () iezoelectric material and the base plate (); and'}, {'b': 1', '10', '10', '22', '22, 'arranged in the device () in such a manner that a force (F) when exerted on the surface (), such as when the surface () is pressed by finger, is transferred to mechanical stress of the element (), the element () then producing a voltage output (V) in response to the mechanical stress;'}], 'at least one element () having piezoelectric characteristics and'}{'b': 2', '3', '3', '1, 'means (R, R, C, IC) for measuring the voltage output (V) in a predefined time period; and'}{'b': '1', 'claim-text': [{'b': '10', 'i) ...
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