Capacitive sensor
First Claim
1. A capacitive sensor comprising:
- a first sensing electrode connected to a first reference capacitor in which is stored reference electric charge;
a second sensing electrode connected to a second reference capacitor in which is stored reference electric charge; and
a shield electrode to which is applied electric potential equal to that of the first sensing electrode and the second sensing electrode,wherein the first sensing electrode is provided adjacent to a detecting surface of the capacitive sensor, and the second sensing electrode is provided opposite to the detecting surface in such a manner that the first and second sensing electrodes are spaced apart and facing to each other,wherein the shield electrode is configured to partly expose the first and second sensing electrodes on the side of the detecting surface, andwherein an extending portion of the shield electrode extends toward the detecting surface beyond an edge of the first sensing electrode at one side of the first and the second sensing electrodes, said edge being provided adjacent to the detecting surface.
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Accused Products
Abstract
A capacitive sensor includes: a first sensing electrode connected to a first reference capacitor in which is stored reference electric charge; a second sensing electrode connected to a second reference capacitor in which is stored reference electric charge; and a shield electrode to which is applied electric potential equal to that of the first sensing electrode and the second sensing electrode. The first sensing electrode positions adjacent to a detecting surface of the capacitive sensor, and the second sensing electrode positions opposite to the detecting surface in such a manner that the first and second sensing electrodes are spaced apart and facing to each other. The shield electrode is configured to partly expose the first and second sensing electrodes on the side of the detecting surface, and the shield electrode extends toward the detecting surface beyond the first sensing electrode.
52 Citations
11 Claims
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1. A capacitive sensor comprising:
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a first sensing electrode connected to a first reference capacitor in which is stored reference electric charge; a second sensing electrode connected to a second reference capacitor in which is stored reference electric charge; and a shield electrode to which is applied electric potential equal to that of the first sensing electrode and the second sensing electrode, wherein the first sensing electrode is provided adjacent to a detecting surface of the capacitive sensor, and the second sensing electrode is provided opposite to the detecting surface in such a manner that the first and second sensing electrodes are spaced apart and facing to each other, wherein the shield electrode is configured to partly expose the first and second sensing electrodes on the side of the detecting surface, and wherein an extending portion of the shield electrode extends toward the detecting surface beyond an edge of the first sensing electrode at one side of the first and the second sensing electrodes, said edge being provided adjacent to the detecting surface. - View Dependent Claims (2, 3, 4)
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5. A capacitive sensor comprising:
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first and second sensing electrodes which are spaced apart from each other, said first sensing electrode having first and second edges; a shield electrode which is spaced from and surrounds the sensing electrodes; and a coating member which holds the sensing electrodes and the shield electrode and which is made of an insulating material, wherein the coating member includes a mounting portion for attaching the capacitive sensor to a fixing member, wherein the mounting portion is provided with a core member, and a same electric potential is applied to the core member and the shield electrode, wherein both the core member and an extending portion of the shield electrode extend toward the detecting surface beyond a second edge of the first sensing electrode, the second edge being provided opposite the first edge and adjacent to the detecting surface. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification