SINGLE SENSOR PROXIMITY DETECTOR
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United States of America
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Jan 11, 2018
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Jan 11, 2018
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Abstract
A capacitive proximity detector for use in a connected portable device such as a telephone, laptop or tablet, in which the capacity seen by the sensor electrode is compared with four thresholds: a proximity threshold, set lower than the other, to generate a general proximity flag, and a body detection threshold set higher than the other arranged to generate a body detection flag that indicates that the object in proximity is a part of a human body. Two object detection thresholds in the region between the proximity threshold and the body threshold define a region in which the detector can decide whether the object in proximity is an inanimate object, based on the time variation of the capacity.
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