Micromechanical component for a yaw rate sensor and corresponding production method

Patent metadata

Field	Value
Publication number	US-11719539-B2
Application number	US-202117235363-A
Country	US
Kind code	B2
Filing date	Apr 20, 2021
Priority date	Apr 28, 2020
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A micromechanical component for a yaw rate sensor. The component includes a substrate having a substrate surface, a first rotor mass developed in one piece, which is able to be set into a first torsional vibration about a first axis of rotation aligned perpendicular to the substrate surface, and at least one first component of the micromechanical component. The first rotor mass is connected to the at least one first component via at least one first spring element. The at least one first spring element extends through a lateral concavity on the first rotor mass in each case and is connected to a recessed edge region of the first rotor mass. A yaw rate sensor and a production method for a micromechanical component for a yaw rate sensor, are also described.

First claim

What is claimed is:

1. A micromechanical component for a yaw rate sensor, comprising:
a substrate having a substrate surface;
a first rotor mass developed in one piece, which is able to be set into a first torsional vibration about a first axis of rotation aligned perpendicular to the substrate surface; and
at least one first component of the micromechanical component, the first rotor mass being connected to the at least one first component via at least one first spring element, wherein the at least one first spring element extends through a lateral concavity on the first rotor mass and is connected to a recessed edge region of the first rotor mass,
wherein the lateral concavity is an indentation or a depression on a side of the first rotor mass,
a second rotor mass developed in one piece, which is realized in mirror symmetry with the first rotor mass in relation to a plane of symmetry that is aligned perpendicular to the substrate surface and centrally intersects the first rotor mass and the second rotor mass, the second rotor mass being able to be set into a second torsional vibration, phase-shifted in phase by 180° in relation to the first torsional vibration, about a second axis of rotation aligned in parallel with the first axis of rotation, the second rotor mass being connected via at least one second spring element to the at least one first component and/or to at least one second component of the micromechanical component, each of the at least one second spring element extending through a lateral concavity on the second rotor mass and being connected to a recessed edge region of the second rotor mass,
wherein the micromechanical component, as the at least one first component, has a first pair of drive structures, and, as the at least one second component, has a second pair of drive structures, first drive structures of the first pair of drive structures and the second pair of drive structures, situated on a first side of the plane of symmetry, are in mirror symmetry with second drive structures of the first pair of drive structures and the second pair of drive structures situated on a second side of the plane of symmetry, in relation to the plane of symmetry, and the first drive structure of the first pair of drive structures is able to be set into a first harmonic torsional vibration aligned in parallel with the plane of symmetry; the second drive structure of the first pair of drive structures is able to be set into a second harmonic torsional vibration, which is aligned in parallel with the plane of symmetry and phase-shifted by 180° in relation to the first harmonic torsional vibration; the first drive structure of the second pair of drive structures is able to be set into the second harmonic torsional vibration, and the second drive structure of the second pair of drive structures is able to be set into the first harmonic torsional vibration such that the first and second rotor masses are set into their respective torsional vibration with the aid of the first and second pairs of drive structures set into their respective torsional vibration,
wherein the micromechanical component additionally has a first pair of seismic masses and a second pair of seismic masses, a first seismic mass each of the first pair and the second pair, situated on a first side of the plane of symmetry, is in mirror symmetry in relation to the plane of symmetry with second seismic masses of the first pair and the second pair situated on a second side of the plane of symmetry, and the first and second pair of seismic masses are able to be set into harmonic torsional co-vibrations which are aligned in parallel with the plane of symmetry, with the aid of the first and second rotor masses set into their respective torsional vibration and/or with the aid of the first and second pair of drive structures set into their respective harmonic torsional vibration,
the first pair of seismic masses is connected to a first coupling rocker, and the second pair of seismic masses is connected to a second coupling rocker, wherein each of the two coupling rockers is pivotable about a rocker axis which is aligned perpendicular to the substrate surface.

2. The micromechanical component as recited in claim 1 , wherein the first and second rotor masses are developed and/or positioned in such a way that the first and second rotor masses, set into their respective torsional vibration, are pivotable about an axis of rotation situated in the plane of symmetry and pivotable about a further axis of rotation aligned perpendicular to the plane of symmetry in each case.

3. The micromechanical component as recited in claim 2 , wherein the micromechanical component, as the at least one first component, includes at least one rocker structure which is aligned in parallel with the plane of symmetry and to which the first rotor mass is connected via the at least one first spring element and the second rotor mass is connected via the at least one second spring element.

4. The micromechanical component as recited in claim 1 , wherein the first and second rotor masses are developed and/or situated in such a way that when the first and second rotor masses are set into their respective torsional vibration, a vector sum of a first torque of the first torsional vibration of the first rotor mass and of a second torque of the second torsional vibration of the second rotor mass is equal to zero.

5. The micromechanical component as recited in claim 1 , wherein the first and second pair of seismic masses, set into their respective harmonic torsional co-vibrations, are also deflectable perpendicular to the plane of symmetry.

6. A yaw rate sensor, comprising:
a micromechanical component, including:
a substrate having a substrate surface,
a first rotor mass developed in one piece, which is able to be set into a first torsional vibration about a first axis of rotation aligned perpendicular to the substrate surface, and
at least one first component of the micromechanical component, the first rotor mass being connected to the at least one first component via at least one first spring element, wherein the at least one first spring element extends through a lateral concavity on the first rotor mass and is connected to a recessed edge region of the first rotor mass,

wherein the lateral concavity is an indentation or a depression on a side of the first rotor mass,
a second rotor mass developed in one piece, which is realized in mirror symmetry with the first rotor mass in relation to a plane of symmetry that is aligned perpendicular to the substrate surface and centrally intersects the first rotor mass and the second rotor mass, the second rotor mass being able to be set into a second torsional vibration, phase-shifted in phase by 180° in relation to the first torsional vibration, about a second axis of rotation aligned in parallel with the first axis of rotation, the second rotor mass being connected via at least one second spring element to the at least one first component and/or to at least one second component of the micromechanical component, each of the at least one second spring element extending through a lateral concavity on the second rotor mass and being connected to a recessed edge region of the second rotor mass,
wherein the micromechanical component, as the at least one first component, has a first pair of drive structures, and, as the at least one second component, has a second pair of drive structures, first drive structures of the first pair of drive structures and the second pair of drive structures, situated on a first side of the plane of symmetry, are in mirror symmetry with second drive structures of the first pair of drive structures and the second pair of drive structures situated on a second side of the plane of symmetry, in relation to the plane of sym

Assignees

• Bosch Gmbh Robert

Inventors

• Kuehnel Matthias
• Kuhlmann Nils Felix
• Maul Robert
• Scheben Rolf
• Markisch Steffen
• Balslink Thorsten
• Geiger Wolfram

Classifications

• G01C19/5712 Primary

  the devices involving a micromechanical structure · CPC title

• B81B3/0021

  Transducers for transforming electrical into mechanical energy or vice versa (dynamo-electric machines H02K99/00; electrostatic machines H02N1/00; piezoelectric devices H10N30/00) · CPC title

• G01C25/00

  Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass (testing, calibrating or compensating compasses G01C17/38) · CPC title

• G01P3/44

  for measuring angular speed (G01P3/56 takes precedence) · CPC title

• B81B2201/0242

  Gyroscopes · CPC title