Capacitive physical quantity sensor
First Claim
1. A capacitive physical quantity sensor, comprising:
- a first substrate having one surface;
a movable electrode disposed on the one surface of the first substrate and displaceable along the one surface in response to an application of a physical quantity;
a fixed electrode disposed on the one surface of the first substrate and facing the movable electrode, an interval between the fixed electrode and the movable electrode changing in response to a displacement of the movable electrode; and
a second substrate joining with the first substrate, whereinan auxiliary electrode is disposed on a portion of the second substrate to face the movable electrode, and the auxiliary electrode has a facing area that faces the movable electrode,the facing area in a case where the movable electrode is displaced in one direction is different from the facing area in a case where the movable electrode is displaced in an opposite direction opposite to the one direction, andthe physical quantity applied in a displacement direction of each of the movable electrodes with respect to the fixed electrode is detected based on both of a first capacitance, which is generated corresponding to the interval between the fixed electrode and the movable electrode, and a second capacitance, which is generated corresponding to an interval between the facing area of the movable electrode and the auxiliary electrode.
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Accused Products
Abstract
A capacitive physical quantity sensor includes a first substrate, a movable electrode, a fixed electrode, and a second substrate. An auxiliary electrode is disposed on a portion of the second substrate to face the movable electrode and the auxiliary electrode has a facing area that faces the movable electrode. The facing area in a case where the movable electrode is displaced in one direction is different from the facing area in a case where the movable electrode is displaced in an opposite direction opposite to the one direction. The physical quantity is detected based on a capacitance, which is generated corresponding to the interval between the fixed electrode and the movable electrode, and a capacitance, which is generated corresponding to an interval between the facing area of the movable electrode and the auxiliary electrode.
9 Citations
9 Claims
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1. A capacitive physical quantity sensor, comprising:
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a first substrate having one surface; a movable electrode disposed on the one surface of the first substrate and displaceable along the one surface in response to an application of a physical quantity; a fixed electrode disposed on the one surface of the first substrate and facing the movable electrode, an interval between the fixed electrode and the movable electrode changing in response to a displacement of the movable electrode; and a second substrate joining with the first substrate, wherein an auxiliary electrode is disposed on a portion of the second substrate to face the movable electrode, and the auxiliary electrode has a facing area that faces the movable electrode, the facing area in a case where the movable electrode is displaced in one direction is different from the facing area in a case where the movable electrode is displaced in an opposite direction opposite to the one direction, and the physical quantity applied in a displacement direction of each of the movable electrodes with respect to the fixed electrode is detected based on both of a first capacitance, which is generated corresponding to the interval between the fixed electrode and the movable electrode, and a second capacitance, which is generated corresponding to an interval between the facing area of the movable electrode and the auxiliary electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification