Capacitive sensor for detecting a physical value such as acceleration
First Claim
1. A capacitive sensor for detecting a physical value, comprising:
- a first plate having a fixed portion and a movable portion supported by said fixed portion through a flexible supporting portion, said movable portion being moved in response to a change in said physical value and having a moving electrode thereon;
a second plate having a fixed electrode thereon and anodically bonded to said first plate, said fixed electrode facing said moving electrode with a predetermined gap; and
a dummy electrode formed on said second plate at a location facing said flexible supporting portion, said dummy electrode being electrically connected to said first late, wherein said physical value is detected as a change in capacitance between the plates.
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Accused Products
Abstract
A capacitive acceleration sensor is composed of a silicon plate, a glass plate and a substrate. The silicon plate has a fixed portion and a movable portion supported by the fixed portion through spring beams. The movable portion is moved in response to the change in the acceleration and is provided with a moving electrode thereon. The glass plate is provided with a fixed electrode and anodically bonded to the silicon plate so that the fixed electrode faces the moving electrode with a predetermined gap. On the glass plate, a first dummy electrode is formed at a location corresponding to the spring beams of the silicon plate. The dummy electrode has a terminal portion at one end so as to be electrically connected with the silicon plate during anodic bonding of the plates. On the substrate, a second dummy electrode is formed at a location corresponding to the movable portion of the silicon plate. The dummy electrode, similarly, has a terminal portion at one end so as to be electrically connected with the silicon plate during anodic bonding of the silicon plate and the substrate.
37 Citations
6 Claims
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1. A capacitive sensor for detecting a physical value, comprising:
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a first plate having a fixed portion and a movable portion supported by said fixed portion through a flexible supporting portion, said movable portion being moved in response to a change in said physical value and having a moving electrode thereon; a second plate having a fixed electrode thereon and anodically bonded to said first plate, said fixed electrode facing said moving electrode with a predetermined gap; and a dummy electrode formed on said second plate at a location facing said flexible supporting portion, said dummy electrode being electrically connected to said first late, wherein said physical value is detected as a change in capacitance between the plates. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification