Microelectromechanical structure with enhanced rejection of acceleration noise
First Claim
1. A device, comprising:
- a substrate;
an anchor attached to the substrate;
a first pair of sensing masses coupled to the anchor;
a second pair of sensing mases coupled to the anchor;
a third pair of sensing masses coupled to the second pair of sensing masses; and
a first pair of driving masses coupled to the first pair of sensing masses.
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Abstract
An integrated MEMS structure includes a driving assembly anchored to a substrate and actuated with a driving movement. A pair of sensing masses suspended above the substrate and coupled to the driving assembly via elastic elements is fixed in the driving movement and performs a movement along a first direction of detection, in response to an external stress. A coupling assembly couples the pair of sensing masses mechanically to couple the vibration modes. The coupling assembly is formed by a rigid element, which connects the sensing masses and has a point of constraint in an intermediate position between the sensing masses, and elastic coupling elements for coupling the rigid element to the sensing masses to present a first stiffness to a movement in phase-opposition and a second stiffness, greater than the first, to a movement in phase, of the sensing masses along the direction of detection.
125 Citations
21 Claims
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1. A device, comprising:
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a substrate; an anchor attached to the substrate; a first pair of sensing masses coupled to the anchor; a second pair of sensing mases coupled to the anchor; a third pair of sensing masses coupled to the second pair of sensing masses; and a first pair of driving masses coupled to the first pair of sensing masses. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device, comprising:
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a substrate; an anchor attached to the substrate; a first pair of sensing masses coupled to the anchor; a second pair of sensing mases coupled to the anchor; and a third pair of sensing masses coupled to the second pair of sensing masses, wherein the first and second pairs of sensing masses are rectangular and the third pair of sensing masses are C-shaped masses. - View Dependent Claims (9, 10, 11)
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12. A device, comprising:
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a substrate; an anchor attached to the substrate; a first pair of sensing masses coupled to the anchor aligned along a first axis; a second pair of sensing mases coupled to the first pair of sensing masses and aligned along the first axis, a first one of the second pair of sensing masses being separated from a second one of the second pair of sensing masses by the first pair of sensing masses; and a third pair of sensing masses coupled to at least one of the first pair of sensing masses or the anchor. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A device, comprising:
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a substrate; an anchor attached to the substrate; a first pair of sensing masses coupled to the anchor and aligned along a first axis; a second pair of sensing mases coupled to the anchor and aligned along the first axis; and a third pair of sensing masses coupled to the second pair of masses. - View Dependent Claims (19, 20, 21)
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Specification