PROXIMITY DETECTION DEVICE AND PROXIMITY DETECTION METHOD
First Claim
1. A proximity detection device of obtaining an approach determination or an approach position of an object, characterized by comprising:
- plural transmitting electrodes corresponding to one dimension in a detection area on supporting means and receiving electrodes corresponding to the other dimension;
multiline driving means for simultaneously applying periodic alternating voltages to at least two electrodes of the transmitting electrodes;
current measurement means for measuring currents or amounts of charge from the receiving electrodes in synchronization with driving to the transmitting electrodes;
computing means for obtaining the approach determination or the approach position of the object toward the detection area by converting current values or amounts of charge measured in the current measurement means into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes; and
control means for managing statuses and sequences of the multiline driving means, the current measurement means, and the computing means.
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Accused Products
Abstract
In a proximity detection device and a proximity detection method of detecting an approach and a position of an object of a human finger or the like by changes in electrostatic capacitances of respective intersections of plural electrodes arranged in correspondence with two-dimensional coordinates, high-speed detection in a high dynamic range can be performed by low-voltage driving. Alternating voltages having different patterns are simultaneously applied to plural transmitting electrodes, the detected currents are inversely converted by linear computation, and values in response to the electrostatic capacitances of the intersections of the respective electrodes are detected.
65 Citations
23 Claims
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1. A proximity detection device of obtaining an approach determination or an approach position of an object, characterized by comprising:
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plural transmitting electrodes corresponding to one dimension in a detection area on supporting means and receiving electrodes corresponding to the other dimension; multiline driving means for simultaneously applying periodic alternating voltages to at least two electrodes of the transmitting electrodes; current measurement means for measuring currents or amounts of charge from the receiving electrodes in synchronization with driving to the transmitting electrodes; computing means for obtaining the approach determination or the approach position of the object toward the detection area by converting current values or amounts of charge measured in the current measurement means into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes; and control means for managing statuses and sequences of the multiline driving means, the current measurement means, and the computing means. - View Dependent Claims (2, 3, 4, 8, 9, 10)
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5-7. -7. (canceled)
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11. A proximity detection method of obtaining an approach determination or an approach position of an object, characterized by comprising:
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a driving and measurement step of simultaneously applying periodic alternating voltages to plural transmitting electrodes corresponding to one dimension in a detection area for detection of the approach of the object and measuring currents or amounts of charge from receiving electrodes corresponding to the other dimension in synchronization with driving to the transmitting electrodes; and a computation step of obtaining the approach determination or the approach position of the object toward the detection area by converting current values or amounts of charge obtained at the driving and measurement step into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes. - View Dependent Claims (12, 13, 14, 21, 22, 23)
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15-20. -20. (canceled)
Specification