Tri-axis accelerometer having a single proof mass and fully differential output signals
First Claim
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1. A tri-axis accelerometer, comprising:
- a proof mass;
at least four anchor points arranged in at least two opposite pairs, a first pair of anchor points being arranged opposite one another along a first axis, a second pair of anchor points being arranged opposite one another along a second axis, the first axis and the second axis being perpendicular to one another; and
at least four spring units to connect the proof mass to the at least four anchor points, the spring units each including a pair of identical springs, each spring including a sensing unit.
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Abstract
A tri-axis accelerometer includes a proof mass, at least four anchor points arranged in at least two opposite pairs, a first pair of anchor points being arranged opposite one another along a first axis, a second pair of anchor points being arranged opposite one another along a second axis, the first axis and the second axis being perpendicular to one another, and at least four spring units to connect the proof mass to the at least four anchor points, the spring units each including a pair of identical springs, each spring including a sensing unit.
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Citations
20 Claims
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1. A tri-axis accelerometer, comprising:
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a proof mass; at least four anchor points arranged in at least two opposite pairs, a first pair of anchor points being arranged opposite one another along a first axis, a second pair of anchor points being arranged opposite one another along a second axis, the first axis and the second axis being perpendicular to one another; and at least four spring units to connect the proof mass to the at least four anchor points, the spring units each including a pair of identical springs, each spring including a sensing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tri-axis accelerometer, comprising:
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a proof mass; a plurality of anchor points arranged in at least two pairs opposite one another along at least two axial directions that are perpendicular to one another; and a plurality of spring units to connect the proof mass to the plurality of anchor points, the spring units each including a pair of identical springs, each spring including a sensing unit. - View Dependent Claims (11, 12, 13, 14)
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15. A method of fabricating a tri-axis accelerometer, comprising:
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providing a substrate layer; providing an intermediate layer on the substrate layer; providing a top layer on the intermediate layer; providing a sensing material on the top layer; patterning the top layer to form at least four pairs of sensing structure elements underneath the sensing material, and a proof mass arranged between the at least two pairs of sensing structure elements, the at least four pairs of sensing structure elements being arranged along at least two axial directions that are perpendicular to one another; removing a portion of the intermediate layer underneath the sensing structure elements; and removing a portion of the intermediate layer underneath at least a part of the proof mass. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification