Detection structure for a Z-axis resonant accelerometer
First Claim
1. A detection structure for a z-axis resonant accelerometer, comprising:
- a substrate;
elastic anchorage elements;
an inertial mass anchored to the substrate by the elastic anchorage elements and suspended above said substrate, said elastic elements being configured to enable said inertial mass to perform an inertial movement of rotation about a first axis of rotation parallel to a horizontal axis belonging to a plane of main extension of said inertial mass, in response to an external acceleration acting along a vertical axis transverse with respect to said plane;
first and second elastic supporting elements;
a first resonator element and a second resonator element, mechanically coupled to said inertial mass by the first and second elastic supporting elements, respectively, said elastic supporting elements being configured to enable a movement of rotation of said first resonator element and second resonator element respectively about a second axis of rotation and a third axis of rotation, respectively, said second axis of rotation and third axis of rotation being parallel to one another, and parallel to the first axis of rotation of said inertial mass;
driving elements coupled to said first resonator element and second resonator element, the driving elements including driving electrodes formed on said substrate and set underneath, and capacitively coupled to, each of said first and second resonator elements; and
first electrical-conduction paths formed on said substrate, the first electrical-conduction paths being configured to contact said driving electrodes, said first electrical-conduction paths not being set underneath said inertial mass.
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Accused Products
Abstract
A detection structure for a z-axis resonant accelerometer is provided with an inertial mass anchored to a substrate by means of elastic anchorage elements so as to be suspended above the substrate and perform an inertial movement of rotation about a first axis of rotation belonging to a plane of main extension of the inertial mass, in response to an external acceleration acting along a vertical axis transverse with respect to the plane; and a first resonator element and a second resonator element, which are mechanically coupled to the inertial mass by respective elastic supporting elements, which enable a movement of rotation about a second axis of rotation and a third axis of rotation, in a resonance condition. In particular, the second axis of rotation and the third axis of rotation are parallel to one another, and are moreover parallel to the first axis of rotation of the inertial mass.
10 Citations
25 Claims
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1. A detection structure for a z-axis resonant accelerometer, comprising:
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a substrate; elastic anchorage elements; an inertial mass anchored to the substrate by the elastic anchorage elements and suspended above said substrate, said elastic elements being configured to enable said inertial mass to perform an inertial movement of rotation about a first axis of rotation parallel to a horizontal axis belonging to a plane of main extension of said inertial mass, in response to an external acceleration acting along a vertical axis transverse with respect to said plane; first and second elastic supporting elements; a first resonator element and a second resonator element, mechanically coupled to said inertial mass by the first and second elastic supporting elements, respectively, said elastic supporting elements being configured to enable a movement of rotation of said first resonator element and second resonator element respectively about a second axis of rotation and a third axis of rotation, respectively, said second axis of rotation and third axis of rotation being parallel to one another, and parallel to the first axis of rotation of said inertial mass; driving elements coupled to said first resonator element and second resonator element, the driving elements including driving electrodes formed on said substrate and set underneath, and capacitively coupled to, each of said first and second resonator elements; and first electrical-conduction paths formed on said substrate, the first electrical-conduction paths being configured to contact said driving electrodes, said first electrical-conduction paths not being set underneath said inertial mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A resonant accelerometer, comprising:
a detection structure configured to detect a component of external linear acceleration directed along a vertical axis, the detection structure including; a substrate; elastic anchorage elements; an inertial mass having first and second windows and a first outer lateral surface, said second window facing outside of said inertial mass, the inertial mass being anchored to the substrate by the elastic anchorage elements and suspended above said substrate, said elastic elements being configured to enable said inertial mass to perform an inertial movement of rotation about a first axis of rotation parallel to a horizontal axis belonging to a plane of main extension of said inertial mass, in response to an external acceleration acting along the vertical axis that is transverse with respect to said plane; first and second elastic supporting elements; and a first resonator element positioned in the first window and a second resonator element positioned in the second window, said second resonator element having a second outer lateral surface flush with and aligned along said horizontal axis with respect to said first outer lateral surface of said inertial mass, said first and second resonator elements being mechanically coupled to said inertial mass by the first and second elastic supporting elements, respectively, said elastic supporting elements being configured to enable a movement of rotation of said first resonator element and second resonator element, respectively about a second axis of rotation and a third axis of rotation, respectively, said second axis of rotation and third axis of rotation being parallel to one another, and parallel to the first axis of rotation of said inertial mass. - View Dependent Claims (13, 14, 15, 16)
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17. An electronic apparatus, comprising:
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a control unit; and a resonant accelerometer coupled to the control unit, the accelerometer including; a detection structure configured to detect a component of external linear acceleration directed along a vertical axis, the detection structure including; a substrate; elastic anchorage elements; an inertial mass having first and second windows and a first outer lateral surface, the inertial mass being anchored to the substrate by the elastic anchorage elements and suspended above said substrate, said elastic elements being configured to enable said inertial mass to perform an inertial movement of rotation about a first axis of rotation parallel to a horizontal axis belonging to a plane of main extension of said inertial mass, in response to an external acceleration acting along the vertical axis that is transverse with respect to said plane; first and second elastic supporting elements; and a first resonator element positioned in the first window and a second resonator element positioned in the second window, said second resonator element having a second outer lateral surface aligned with the first outer lateral surface of said inertial mass, said first and second resonator elements being mechanically coupled to said inertial mass by the first and second elastic supporting elements, respectively, said elastic supporting elements being configured to enable a movement of rotation of said first resonator element and second resonator element, respectively about a second axis of rotation and a third axis of rotation, respectively, said second axis of rotation and third axis of rotation being parallel to one another, and parallel to the first axis of rotation of said inertial mass; a reading circuit coupled to the accelerometer; and a driving circuit coupled to the accelerometer. - View Dependent Claims (18, 19, 20)
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21. A resonant accelerometer, comprising:
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a substrate; a mass overlying the substrate, the mass being configured to rotate about a first axis, the mass having; a first end; a second end opposite to the first end; a first opening extending through the first end; and a second opening; a first resonator element elastically coupled to the mass and positioned in the first opening, the first resonator element being configured to rotate about a second axis; a second resonator element elastically coupled to the mass and positioned in the second opening, the second resonator element being configured to rotate about a third axis. - View Dependent Claims (22, 23, 24, 25)
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Specification