Semiconductor mechanical sensor
First Claim
1. A semiconductor mechanical sensor comprising:
- a movable portion which is formed on a substrate and has a first face on which a first electrode is provided and a second face on which a second electrode is provided;
a first correspondent electrode and a second correspondent electrode formed at the position facing said first electrode and second electrode respectively;
a first outgoing contact electrode contacted to said first electrode;
a second outgoing contact electrode contacted to said first correspondent electrode;
a third outgoing contact electrode contacted to said second electrode;
a fourth outgoing contact electrode contacted to said second correspondent electrode;
wherein said first to fourth outgoing contact electrodes are provided on substantially the same plane and mechanical force which acts in one direction of said moveable portion is detected by said first electrode and said first correspondent electrode and mechanical force which acts in another direction different from said one direction of said movable portion is detected by said second electrode and second correspondent electrode.
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Accused Products
Abstract
A semiconductor mechanical sensor having a new structure in which a S/N ratio is improved. In the central portion of a silicon substrate 1, a recess portion 2 is formed which includes a beam structure. A weight is formed at the tip of the beam, and in the bottom surface of the weight in the bottom surface of the recess portion 2 facing the same, an electrode 5 is formed. An alternating current electric power is applied between the weight portion 4 and the electrode 5 so that static electricity is created and the weight is excited by the static electricity. In an axial direction which is perpendicular to the direction of the excitation of the weight, an electrode 6 is disposed to face one surface of the weight and a wall surface of the substrate which faces the same. A change in a capacitance between the facing electrodes is electrically detected, and therefore, a change in a physical force acting in the same direction is detected.
143 Citations
41 Claims
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1. A semiconductor mechanical sensor comprising:
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a movable portion which is formed on a substrate and has a first face on which a first electrode is provided and a second face on which a second electrode is provided;
a first correspondent electrode and a second correspondent electrode formed at the position facing said first electrode and second electrode respectively;
a first outgoing contact electrode contacted to said first electrode;
a second outgoing contact electrode contacted to said first correspondent electrode;
a third outgoing contact electrode contacted to said second electrode;
a fourth outgoing contact electrode contacted to said second correspondent electrode;
wherein said first to fourth outgoing contact electrodes are provided on substantially the same plane and mechanical force which acts in one direction of said moveable portion is detected by said first electrode and said first correspondent electrode and mechanical force which acts in another direction different from said one direction of said movable portion is detected by said second electrode and second correspondent electrode. - View Dependent Claims (6, 8, 12, 14, 18, 20, 25, 30, 35, 40)
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2. A semiconductor mechanical sensor comprising:
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a movable portion which is formed on a conductive portion arranged on a substrate through a predetermined gap and which has a first face on which a first electrode is provided and a second face on which a second electrode is provided;
a correspondent electrode formed at the position facing said first electrode and second electrode respectively;
a first outgoing contact electrode contacted to said first electrode;
a second outgoing contact electrode contacted to said first correspondent electrode;
a third outgoing contact electrode contacted to said second electrode;
a fourth outgoing contact electrode contacted to said second correspondent electrode;
wherein said first to fourth outgoing contact electrodes are provided on said conductive portion, and mechanical force which acts in one direction of said movable portion is detected by said first electrode and said first correspondent electrode, and mechanical force which acts in another direction different from said one direction of said movable portion is detected by said second electrode and said second correspondent electrode. - View Dependent Claims (7, 9, 13, 15, 19, 21, 26, 31, 36, 41)
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3. A semiconductor mechanical sensor comprising:
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a first electrode which is formed on a conductive portion arranged on a substrate;
a movable portion which is formed on said conductive portion through a predetermined gap and which moves in a direction substantially perpendicular to said substrate;
a second electrode which is formed at the position facing said first electrode of said movable portion;
a first outgoing contact electrode contacted to said first electrode;
a second outgoing contact electrode contacted to said second electrode;
wherein said first and second outgoing contact electrodes are provided on substantially the same plane;
and mechanical force which acts to said movable portion is detected by said first and second electrodes. - View Dependent Claims (10, 16, 22, 27, 32, 37)
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4. A semiconductor mechanical sensor comprising:
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a first electrode which is formed on a first conductive portion arranged on a substrate;
a movable portion which is formed on a second conductive portion arranged on said first conductive portion through a predetermined gap and which moves in a direction substantially perpendicular to said substrate;
a second electrode which is formed at the position facing said first electrode of said movable portion;
a first outgoing contact electrode contacted to said first electrode;
a second outgoing contact electrode contacted to said second electrode;
wherein said first and second outgoing contact electrodes are provided on said second conductive portion, and mechanical force which acts to said movable portion is detected by said first and second electrodes. - View Dependent Claims (11, 17, 23, 28, 33, 38)
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5. A semiconductor mechanical sensor comprising:
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a first electrode which is formed on a first conductive portion arranged on a substrate;
a movable portion comprising a second conductive portion which is formed on said first conductive portion through a predetermined gap and which moves in a direction substantially perpendicular to said substrate;
a second electrode which is formed at the position on said movable portion facing said first electrode;
wherein conductive portion formed on said substrate is configured by said first and second conductive portions, and mechanical force which acts to said movable portion is detected by said first and second electrodes. - View Dependent Claims (24, 29, 34, 39)
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Specification