Capacitive coordinate detection device
First Claim
1. A capacitive coordinate detection device in which a plurality of detection electrodes, which extend in the Y direction and are disposed with a predetermined gap in the X direction, each detection electrode being applied with a voltage, and a plurality of common electrodes, which are located between the detection electrodes adjacent to each other and extend in the Y direction, are formed in a base sheet, and in which when a contact body serving as a conductor is brought into contact with or approaches the base sheet, variations in a capacitance between the detection electrodes and the common electrodes opposite to the detection electrodes are detected to detect a location of a place which the contact body touches or approaches on an XY coordinate plane,wherein when one of the common electrodes is set as a reference common electrode, one of the detection electrodes, which is adjacent to one side of the reference common electrode, is set as a first detection electrode, and one of the detection electrodes, which is adjacent to the other side of the reference common electrode, is set as a second detection electrode, detours that approach one of the reference common electrode and the first detection electrode, and the reference common electrode and the second detection electrode are formed in at least the other one of the reference common electrode and the first detection electrode, and the reference common electrode and the second detection electrode in a specific place, andwherein when a capacitance between the reference common electrode and the first detection electrode is set to CR and a capacitance between the reference common electrode and the second detection electrode is set to CL, a pattern of each of the electrodes is set such that a composite capacitance between the capacitance CR and the capacitance CL can be kept constant in such a manner that one of the two capacitances compensates for an increase or a decrease of the other of the two capacitances.
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Accused Products
Abstract
A composite capacitance between a common electrode and an X detection electrode having a plurality of detours is small, whereas lengths of parallel electrodes of the X detection electrode are set to have large values. A comprehensive composite capacitance is set to be constant by increasing a composite capacitance between the common electrode and the X detection electrode. For this reason, although the detours are formed in the electrode patterns, a coordinate position can be detected with high accuracy.
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Citations
11 Claims
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1. A capacitive coordinate detection device in which a plurality of detection electrodes, which extend in the Y direction and are disposed with a predetermined gap in the X direction, each detection electrode being applied with a voltage, and a plurality of common electrodes, which are located between the detection electrodes adjacent to each other and extend in the Y direction, are formed in a base sheet, and in which when a contact body serving as a conductor is brought into contact with or approaches the base sheet, variations in a capacitance between the detection electrodes and the common electrodes opposite to the detection electrodes are detected to detect a location of a place which the contact body touches or approaches on an XY coordinate plane,
wherein when one of the common electrodes is set as a reference common electrode, one of the detection electrodes, which is adjacent to one side of the reference common electrode, is set as a first detection electrode, and one of the detection electrodes, which is adjacent to the other side of the reference common electrode, is set as a second detection electrode, detours that approach one of the reference common electrode and the first detection electrode, and the reference common electrode and the second detection electrode are formed in at least the other one of the reference common electrode and the first detection electrode, and the reference common electrode and the second detection electrode in a specific place, and wherein when a capacitance between the reference common electrode and the first detection electrode is set to CR and a capacitance between the reference common electrode and the second detection electrode is set to CL, a pattern of each of the electrodes is set such that a composite capacitance between the capacitance CR and the capacitance CL can be kept constant in such a manner that one of the two capacitances compensates for an increase or a decrease of the other of the two capacitances.
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9. A capacitive coordinate detection device including a base sheet having a plurality of holes formed therein, a plurality of X detection electrodes, which extend in the Y direction and are disposed with a predetermined gap in the X direction, on one surface of the base sheet, each X detection electrode being applied with a voltage, a plurality of Y detection electrodes, which extend in the X direction and are disposed with a predetermined gap in the Y direction, on the other surface of the base sheet, each Y detection electrode being applied with a voltage, a plurality of common electrodes that are opposite to both X detection electrodes adjacent to each other and Y detection electrodes adjacent to each other, the X detection electrodes and the Y detection electrodes being provided on any one surface of the base sheet, a control unit for applying the voltage between the X detection electrodes and the common electrodes and between the Y detection electrodes and the common electrodes with a predetermined timing, and a plurality of leading lines connecting the X detection electrodes and the Y detection electrodes and the control unit,
wherein the leading lines are densely provided near the outside of the X detection electrodes or the Y detection electrodes located at one end, and holes are disposed opposite to the leading lines near the inside of the X or Y detection electrodes, and first adjustment electrodes, which adjust a capacitance between the X detection electrodes or the Y detection electrodes and the common electrodes by causing the X detection electrodes or the Y detection electrodes and the common electrode to be opposite to each other face to face, are formed on one of the X detection electrodes or the Y detection electrodes and the common electrode with the base sheet interposed therebetween.
Specification