Capacitive accelerometer sensor and method for its manufacture
First Claim
1. A capacitive accelerometer sensor having a structure etched out of a conductive monocrystalline layer arranged on a substrate, comprising:
- a seismic mass movable in a longitudinal direction in a plane of the seismic mass in response to an occurrence of an acceleration;
suspension segments coupling the seismic mass to the substrate, the suspension segments being coupled at first ends to the seismic mass and at second ends to the substrate, the suspension segments being coupled such that the seismic mass is movable in the longitudinal direction;
parallel, plate-like first fingers extending from the seismic mass at substantially right angles to the longitudinal direction;
plate-like second fingers, running parallel and opposed to the first fingers, and being coupled at first ends to the substrate;
an isolation strip electrically isolating the second fingers and the suspension segments from a surrounding layer of the conductive monocrystalline layer;
a passivation layer extending over the isolation strip and at least partially over the surrounding layer; and
conductors arranged on the passivation layer and running across the isolation strip, the conductors being coupled to the second fingers and the suspension segments.
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Accused Products
Abstract
A contacting of a capacitive accelerometer sensor of monocrystalline material is achieved by a capacitive accelerometer sensor having a structure etched out of a monocrystalline layer arranged on a substrate, including a seismic mass that is only joined to the substrate by suspension segments and executing a movement in its longitudinal direction in response to the occurrence of an acceleration of parallel, plate-like first fingers extending out from this mass at right angles to their longitudinal direction and of plate-like second fingers running parallel to the first fingers and anchored to the substrate. The first and second fingers form a capacitor arrangement. The suspension segments, which are anchored with their end region that is distant from the seismic mass to the substrate, and second fingers are electrically isolated, by an isolation strip, from the other remaining layer of monocrystalline material. A passivation layer extends over the isolation strip, and at least partially over the remaining layer. Conductors arranged on the passivation layer and serving as connecting leads for the capacitor arrangement extend across the isolation strip up to the connections of the capacitor arrangement, and are contacted there.
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Citations
9 Claims
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1. A capacitive accelerometer sensor having a structure etched out of a conductive monocrystalline layer arranged on a substrate, comprising:
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a seismic mass movable in a longitudinal direction in a plane of the seismic mass in response to an occurrence of an acceleration; suspension segments coupling the seismic mass to the substrate, the suspension segments being coupled at first ends to the seismic mass and at second ends to the substrate, the suspension segments being coupled such that the seismic mass is movable in the longitudinal direction; parallel, plate-like first fingers extending from the seismic mass at substantially right angles to the longitudinal direction; plate-like second fingers, running parallel and opposed to the first fingers, and being coupled at first ends to the substrate; an isolation strip electrically isolating the second fingers and the suspension segments from a surrounding layer of the conductive monocrystalline layer; a passivation layer extending over the isolation strip and at least partially over the surrounding layer; and conductors arranged on the passivation layer and running across the isolation strip, the conductors being coupled to the second fingers and the suspension segments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification