Method of manufacturing a capacitive acceleration sensor, and a capacitive acceleration sensor
First Claim
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1. A method for manufacturing a capacitive acceleration sensor out of a wafer element, comprising:
- forming an inertia mass;
forming a movable electrode on a central wafer, the mass being supported by torsion springs, symmetrically in the longitudinal direction of the mass, and asymmetrically in the thickness direction of the mass; and
placing measuring electrodes on a second wafer, which electrodes are positioned facing a first side of the mass, symmetrically in relation to the torsion springs and the mass, wherein asymmetrically located lightening features are manufactured into the mass of the acceleration sensor, on a second side, the one opposite to the first side, said lightening features coinciding with the measurement electrodes and not extending through the mass.
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Abstract
The present invention relates to measuring devices used in measuring acceleration and, more precisely, to capacitive acceleration sensors. The object of the invention is to provide an improved method of manufacturing a capacitive acceleration sensor, and to provide a capacitive acceleration sensor, which is applicable for use in small capacitive acceleration sensor solutions, and which, in particular, is applicable for use in small and extremely thin capacitive acceleration sensor solutions measuring acceleration in relation to several axes.
39 Citations
18 Claims
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1. A method for manufacturing a capacitive acceleration sensor out of a wafer element, comprising:
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forming an inertia mass; forming a movable electrode on a central wafer, the mass being supported by torsion springs, symmetrically in the longitudinal direction of the mass, and asymmetrically in the thickness direction of the mass; and placing measuring electrodes on a second wafer, which electrodes are positioned facing a first side of the mass, symmetrically in relation to the torsion springs and the mass, wherein asymmetrically located lightening features are manufactured into the mass of the acceleration sensor, on a second side, the one opposite to the first side, said lightening features coinciding with the measurement electrodes and not extending through the mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A capacitive acceleration sensor comprising:
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an inertia mass forming a movable electrode, the mass being supported by torsion springs, symmetrically in the longitudinal direction of the mass, and asymmetrically in the thickness direction of the mass; measuring electrodes positioned facing a first side of the mass, symmetrically in relation to the torsion springs and the mass; and at least one asymmetrically located lightening feature manufactured into the mass, on a second side of it, the one opposite to the first side, said at least one lightening feature coinciding with the measurement electrodes and not extending through the mass. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification