Capacitive device
First Claim
1. A capacitive device comprising:
- a substrate;
a movable electrode, which is located above a surface of the substrate and is movable with respect to the substrate along directions that are substantially orthogonal to the surface, wherein the movable electrode includes a substrate-confronting surface, at which the movable electrode confronts the surface of the substrate, and an electrode-confronting surface; and
a fixed electrode, which is stationary with respect to the substrate, wherein the fixed electrode includes a substrate-confronting surface, at which the fixed electrode confronts the surface of the substrate, and an electrode-confronting surface, wherein the substrate-confronting surfaces are substantially parallel to the surface of the substrate, wherein the substrate-confronting surfaces are substantially planar and substantially at the same level along the directions that are substantially orthogonal to the surface of the substrate before the movable electrode is displaced, wherein the electrode-confronting surfaces confront each other and are substantially orthogonal to the surface of the substrate, wherein when the movable electrode is displaced in a first direction that is substantially orthogonal to the surface of the substrate, the total sum of area-distance quotients in an overlap between the electrode-confronting surfaces remains substantially unchanged or decreases to provide a first reduction rate that is substantially zero or more, wherein when the movable electrode is displaced in a second direction that is substantially opposite to the first direction, the total sum of area-distance quotients remains substantially unchanged or decreases to provide a second reduction rate that is substantially zero or more, and wherein the reduction rates are different from each other.
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Accused Products
Abstract
A capacitive device includes a substrate, a movable electrode, and a fixed electrode. The movable electrode is located above a surface of the substrate and is movable with respect to the substrate along directions that are substantially orthogonal to the surface. The fixed electrode is stationary with respect to the substrate. When the movable electrode is displaced in a first direction that is substantially orthogonal to the surface, the total sum of area-distance quotients in the overlap between the electrodes remains substantially unchanged or decreases to provide a first reduction rate that is substantially zero or more. On the other hand, when the movable electrode is displaced in a second direction that is substantially opposite to the first direction, the total sum of area-distance quotients remains substantially unchanged or decreases to provide a second reduction rate that is substantially zero or more. The reduction rates are different from each other.
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Citations
18 Claims
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1. A capacitive device comprising:
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a substrate;
a movable electrode, which is located above a surface of the substrate and is movable with respect to the substrate along directions that are substantially orthogonal to the surface, wherein the movable electrode includes a substrate-confronting surface, at which the movable electrode confronts the surface of the substrate, and an electrode-confronting surface; and
a fixed electrode, which is stationary with respect to the substrate, wherein the fixed electrode includes a substrate-confronting surface, at which the fixed electrode confronts the surface of the substrate, and an electrode-confronting surface, wherein the substrate-confronting surfaces are substantially parallel to the surface of the substrate, wherein the substrate-confronting surfaces are substantially planar and substantially at the same level along the directions that are substantially orthogonal to the surface of the substrate before the movable electrode is displaced, wherein the electrode-confronting surfaces confront each other and are substantially orthogonal to the surface of the substrate, wherein when the movable electrode is displaced in a first direction that is substantially orthogonal to the surface of the substrate, the total sum of area-distance quotients in an overlap between the electrode-confronting surfaces remains substantially unchanged or decreases to provide a first reduction rate that is substantially zero or more, wherein when the movable electrode is displaced in a second direction that is substantially opposite to the first direction, the total sum of area-distance quotients remains substantially unchanged or decreases to provide a second reduction rate that is substantially zero or more, and wherein the reduction rates are different from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for manufacturing a capacitive device that includes:
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a substrate;
a movable electrode, which is located above a surface of the substrate and is movable with respect to the substrate along directions that are substantially orthogonal to the surface, wherein the movable electrode includes a substrate-confronting surface, at which the movable electrode confronts the surface of the substrate, and an electrode-confronting surface; and
a fixed electrode, which is stationary with respect to the substrate, wherein the fixed electrode includes a substrate-confronting surface, at which the fixed electrode confronts the surface of the substrate, and an electrode-confronting surface, wherein the substrate-confronting surfaces are substantially parallel to the surface of the substrate, wherein the substrate-confronting surfaces are substantially planar and substantially at the same level along the directions that are substantially orthogonal to the surface of the substrate before the movable electrode is displaced, wherein the electrode-confronting surfaces confront each other and are substantially orthogonal to the surface of the substrate, wherein when the movable electrode is displaced in a first direction that is substantially orthogonal to the surface of the substrate, the total sum of area-distance quotients in an overlap between the electrode-confronting surfaces remains substantially unchanged or decreases to provide a first reduction rate that is substantially zero or more, wherein when the movable electrode is displaced in a second direction that is substantially opposite to the first direction, the total sum of area-distance quotients remains substantially unchanged or decreases to provide a second reduction rate that is substantially zero or more, and wherein the reduction rates are different from each other, wherein one of the electrode-confronting surfaces is substantially planar, wherein the other of the electrode-confronting surfaces includes a first planar surface and a second planar surface, wherein the planar surfaces are substantially planar, wherein the first planar surface is located further away from the surface of the substrate than the second planar surface is, wherein the first planar surface is located further away from the one of the electrode-confronting surfaces than the second planar surface is, and wherein the one of the electrode-confronting surfaces, the first planar surface, and the second planar surface are rectangular, the method comprising;
forming a raw substrate that includes a supporting layer, from which the substrate is formed, a sacrificial layer, and an electrode layer, from which the movable electrode and the fixed electrode are formed, such that the sacrificial layer is located between the supporting layer and the electrode layer;
etching a first predetermined portion of the electrode layer to form a trench;
etching a second predetermined portion of the electrode layer that adjoins the trench; and
etching partially the sacrificial layer at a portion thereof on which the movable electrode and the fixed electrode are formed. - View Dependent Claims (16)
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17. A method for manufacturing a capacitive device that includes:
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a substrate;
a movable electrode, which is located above a surface of the substrate and is movable with respect to the substrate along directions that are substantially orthogonal to the surface, wherein the movable electrode includes a substrate-confronting surface, at which the movable electrode confronts the surface of the substrate, and an electrode-confronting surface; and
a fixed electrode, which is stationary with respect to the substrate, wherein the fixed electrode includes a substrate-confronting surface, at which the fixed electrode confronts the surface of the substrate, and an electrode-confronting surface, wherein the substrate-confronting surfaces are substantially parallel to the surface of the substrate, wherein the substrate-confronting surfaces are substantially planar and substantially at the same level along the directions that are substantially orthogonal to the surface of the substrate before the movable electrode is displaced, wherein the electrode-confronting surfaces confront each other and are substantially orthogonal to the surface of the substrate, wherein when the movable electrode is displaced in a first direction that is substantially orthogonal to the surface of the substrate, the total sum of area-distance quotients in an overlap between the electrode-confronting surfaces remains substantially unchanged or decreases to provide a first reduction rate that is substantially zero or more, wherein when the movable electrode is displaced in a second direction that is substantially opposite to the first direction, the total sum of area-distance quotients remains substantially unchanged or decreases to provide a second reduction rate that is substantially zero or more, and wherein the reduction rates are different from each other, wherein the electrode-confronting surfaces are substantially planar, wherein one of the electrode-confronting surfaces is longer than the other of the electrode-confronting surfaces along the directions substantially orthogonal to the surface of the substrate, wherein the electrode-confronting surfaces are rectangular, the method comprising;
forming a raw substrate that includes a supporting layer, from which the substrate is formed, a sacrificial layer, and an electrode layer, from which the movable electrode and the fixed electrode are formed, such that the sacrificial layer is located between the supporting layer and the electrode layer;
etching a first predetermined portion of the electrode layer to form a trench;
etching a second predetermined portion of the electrode layer that adjoins the trench; and
etching partially the sacrificial layer at a portion thereof on which the movable electrode and the fixed electrode are formed. - View Dependent Claims (18)
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Specification