Micromechanical spring structure

Patent metadata

Field	Value
Publication number	US-10836629-B2
Application number	US-201816154267-A
Country	US
Kind code	B2
Filing date	Oct 8, 2018
Priority date	Oct 10, 2017
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A micromechanical spring structure, including a spring beam and a rigid micromechanical structure, the spring beam including a first end and an opposing second end along a main extension direction. The spring beam includes a fork having two support arms on at least one of the two ends, which is anchored to the rigid micromechanical structure, the two support arms being anchored to a surface of the rigid micromechanical structure, which extends perpendicular to the main extension direction of the spring beam.

First claim

What is claimed is:

1. A micromechanical device comprising:
a substrate; and
a spring structure that includes:
a rigid micromechanical structure; and
a first spring that includes:
a base elastic extension that extends, in a main extension direction, from a first end of the first spring to a second end of the first spring; and
at the second end of the first spring, two support arms into which the base elastic extension of the first spring branches and that are anchored directly to a surface of one side of the rigid micromechanical structure, the surface extending perpendicularly to the main extension directions;

wherein:
(1) the rigid micromechanical structure, to the surface of which the two support arms are directly anchored, is a substrate anchor that is directly and immovably connected to the substrate;
(2) the micromechanical device is a rotation rate sensor, the rigid micromechanical structure, to the surface of which the two support arms are directly anchored, is a movable mass that is movably connected to the substrate via the spring structure, and the spring structure further includes a second spring that includes:
a base elastic extension that extends, in the main extension direction, from a first end of the second spring to a second end of the second spring; and
at the second end of the second spring, two support arms into which the base elastic extension of the second spring branches and that are anchored directly to the surface of the rigid micromechanical structure; and/or

(3) the surface of the rigid micromechanical structure includes a protrusion that protrudes, parallel to the main extension direction, from between respective connection points at which respective ones of the two supports arms of the first spring connect to the rigid micromechanical structure into an area between the two support arms of the first spring.

2. The micromechanical device of claim 1 , wherein the rigid micromechanical structure is the substrate anchor.

3. The micromechanical device of claim 2 , wherein the two support arms form a semicircular frame or an elliptical frame.

4. The micromechanical device of claim 2 , wherein the two support arms and a connection of the two support arms to the base elastic extension form a rectangular frame.

5. The micromechanical device of claim 1 , wherein the micromechanical device is the rotation rate sensor, the rigid micromechanical structure is the movable mass that is movably connected to the substrate via the spring structure, and the spring structure further includes the second spring.

6. The micromechanical device of claim 5 , wherein the two support arms form a semicircular frame or an elliptical frame.

7. The micromechanical device of claim 5 , wherein the two support arms and a connection of the two support arms to the base elastic extension form a rectangular frame.

8. The micromechanical device of claim 5 , wherein the movable mass is a seismic mass.

9. The micromechanical device of claim 5 , wherein the surface of the rigid micromechanical structure includes the protrusion that protrudes, parallel to the main extension direction, from between the respective connection points at which the respective ones of the two supports arms of the first spring connect to the rigid micromechanical structure into the area between the two support arms of the first spring.

10. The micromechanical device of claim 1 , wherein the two support arms and a connection of the two support arms to the base elastic extension form a rectangular frame.

11. The micromechanical device of claim 1 , wherein the two support arms form a semicircular frame or an elliptical frame.

12. The micromechanical device of claim 1 , wherein the surface of the rigid micromechanical structure includes a protrusion that protrudes, parallel to the main extension direction, from between respective connection points at which respective ones of the two supports arms of the first spring connect to the rigid micromechanical structure into an area between the two support arms of the first spring.

Assignees

• Bosch Gmbh Robert

Inventors

• Putnik Martin
• Cardanobile Stefano

Classifications

• B81B3/0072 Primary

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