Capacitive type semiconductor accelerometer
First Claim
1. A capacitive type semiconductor accelerometer comprising:
- an intermediate silicon plate;
a movable electrode constituting a pendulum mass formed within said intermediate silicon plate and supported thereby via a beam so as to permit movement into direction substantially perpendicular to its plane;
a first conductive island formed within said intermediate silicon plate and immovably supported thereby via a first leg;
an upper glass plate bonded to said intermediate silicon plate;
a first stationary electrode formed on said upper glass plate at the position facing to one face of said movable electrode with a predetermined gap;
a lower glass plate bonded to said intermediate silicon plate;
a second stationary electrode formed on said lower glass plate at the position facing to the other face of said movable electrode with a predetermined gap; and
a first, second and third pad being disposed on said lower glass plate at the outside of said intermediate silicon plate, said first pad being electrically connected to said first stationary electrode via a first thin film lead formed on said lower glass plate and said first conductive island, said second pad being electrically connected to said movable electrode via a second thin film lead formed on said lower glass plate and said intermediate silicon plate and said third pad being electrically connected to said second stationary electrode via a third thin film lead formed on said lower glass plate.
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Accused Products
Abstract
A capacitive type semiconductor accelerometer has an intermediate silicon plate of n type conductivity including a movable electrode constituting a pendulum mass formed within the intermediate silicon plate and supported thereby via a beam so as to permit movement in a direction perpendicular to its plane. A first conductive island is formed within the intermediate plate and is immovably supported thereby via a first insulating leg so as to be isolated therefrom, and an upper glass plate is anodic bonded to the intermediate silicon plate. A first stationary electrode is formed on the upper glass plate at the position facing one face of the movable electrode with a predetermined gap. A lower glass plate is anodic bonded to the intermediate silicon plate and a second stationary electrode is formed on the lower glass plate at the position facing the other face of the movable electrode with a predetermined gap. First, second and third pads are disposed in common on the lower glass plate at the outside of the intermediate silicon plate, the first pad being electrically connected to the first stationary electrode via a first thin film lead formed on the lower glass plate and the first conductive island, the second pad being electrically connected to the movable electrode via a second thin film lead formed on the lower glass plate and the intermediate silicon plate and the third pad being electrically connected to the second stationary electrode via a third thin film lead formed on the lower glass plate.
101 Citations
11 Claims
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1. A capacitive type semiconductor accelerometer comprising:
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an intermediate silicon plate; a movable electrode constituting a pendulum mass formed within said intermediate silicon plate and supported thereby via a beam so as to permit movement into direction substantially perpendicular to its plane; a first conductive island formed within said intermediate silicon plate and immovably supported thereby via a first leg; an upper glass plate bonded to said intermediate silicon plate; a first stationary electrode formed on said upper glass plate at the position facing to one face of said movable electrode with a predetermined gap; a lower glass plate bonded to said intermediate silicon plate; a second stationary electrode formed on said lower glass plate at the position facing to the other face of said movable electrode with a predetermined gap; and a first, second and third pad being disposed on said lower glass plate at the outside of said intermediate silicon plate, said first pad being electrically connected to said first stationary electrode via a first thin film lead formed on said lower glass plate and said first conductive island, said second pad being electrically connected to said movable electrode via a second thin film lead formed on said lower glass plate and said intermediate silicon plate and said third pad being electrically connected to said second stationary electrode via a third thin film lead formed on said lower glass plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification