MEMS dynamic pressure sensor, in particular for applications to microphone production
First Claim
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1. A pressure sensor of the MEMS and/or NEMS type, comprising:
- at least one first deformable cavity configured to receive pressure variations from an ambient atmosphere, this first deformable cavity being made in at least a first planar layer extending in a sensor plane of the pressure sensor, and including at least one movable wall which is movable only along said sensor plane, wherein pressure variations are transmitted from an ambient atmosphere to said cavity;
at least one detector having a stationary part provided in at least said sensor plane and being stationary relative to said movable wall, the at least one detector being configured to detect a displacement of the movable wall in the sensor plane under the effect of a pressure variation of the ambient atmosphere; and
at least one secondary cavity, partially in communication with the first deformable cavity, said secondary cavity forming a reference cavity, wherein the secondary cavity is separated from the first cavity at least partially by the at least one movable wall, and the displacement of the movable wall takes place under the effect of a pressure difference between pressures in the first deformable cavity and the secondary cavity.
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Abstract
A pressure sensor of the MEMS and/or NEMS type is disclosed, including:
- at least one first deformable cavity (20) to receive pressure variations from an ambient atmosphere, this first deformable cavity being made in a first substrate and including at least one mobile or deformable wall (25), arranged at least partially in the plane parallel to the first substrate, called plane of the sensor, pressure variations from an ambient atmosphere being transmitted to said cavity,
- a detector (24, 24′) for detecting a displacement or deformation, in the plane of the sensor, of said mobile or deformable wall, under the effect of a pressure variation of the ambient atmosphere.
33 Citations
26 Claims
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1. A pressure sensor of the MEMS and/or NEMS type, comprising:
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at least one first deformable cavity configured to receive pressure variations from an ambient atmosphere, this first deformable cavity being made in at least a first planar layer extending in a sensor plane of the pressure sensor, and including at least one movable wall which is movable only along said sensor plane, wherein pressure variations are transmitted from an ambient atmosphere to said cavity; at least one detector having a stationary part provided in at least said sensor plane and being stationary relative to said movable wall, the at least one detector being configured to detect a displacement of the movable wall in the sensor plane under the effect of a pressure variation of the ambient atmosphere; and at least one secondary cavity, partially in communication with the first deformable cavity, said secondary cavity forming a reference cavity, wherein the secondary cavity is separated from the first cavity at least partially by the at least one movable wall, and the displacement of the movable wall takes place under the effect of a pressure difference between pressures in the first deformable cavity and the secondary cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 24, 25, 26)
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16. A pressure sensor of the MEMS and/or NEMS type, including:
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at least one first deformable cavity configured to receive pressure variations from an ambient atmosphere, this first deformable cavity being made in at least a first planar layer extending in a sensor plane of the pressure sensor, and including at least one movable wall which is movable only along said sensor plane, wherein pressure variations are transmitted through at least one hole from an ambient atmosphere to said cavity; and at least one detector having a stationary part provided in at least said sensor plane and being mechanically connected to said movable wall to detect a displacement of the movable wall in the sensor plane under the effect of a pressure variation of the ambient atmosphere. - View Dependent Claims (17)
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18. A method for producing a MEMS and/or NEMS pressure sensor comprising:
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producing, in a first planar layer, extending in a sensor plane at least one first deformable cavity for receiving pressure variations from an ambient atmosphere, this deformable cavity being delimited by at least one movable wall which is movable only along said sensor plane; producing at least one detector configured to detect a displacement, in said sensor plane, of said movable wall, under the effect of a pressure variation, the detector including a stationary part which is stationary relative to the movable wall; producing at least one secondary cavity, partially in communication with the first cavity, said secondary cavity forming a reference cavity, wherein the secondary cavity is separated from the first cavity at least partially by the at least one movable wall, and the displacement of the movable wall takes place under the effect of a pressure difference between pressures in the first deformable cavity and the secondary cavity; and producing a means for transmitting pressure pulses from an ambient atmosphere to said cavity. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification