MEMS component for generating pressure pulses

Patent metadata

Field	Value
Publication number	US-9369809-B2
Application number	US-201314133134-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Dec 18, 2012
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A MEMS component for generating pressure pulses is provided, its micromechanical structure including at least three function levels: a first function level in which at least one stationary trench structure is implemented, a second function level, which is implemented above the first function level and includes at least one triggerable displacement element as well as through-openings as pressure outlet openings, the displacement element protruding into the trench structure and being movable in parallel with the function levels, whereby positive and negative pressure pulses are generated, and a third function level, which is implemented above the second function level and includes at least one triggerable cover element for at least one part of the pressure outlet openings in the second function level.

First claim

What is claimed is:

1. A MEMS component for generating pressure pulses, comprising:
a micromechanical structure including at least three function levels, wherein:
a first function level includes at least one stationary trench structure,
a second function level is implemented above the first function level and includes at least one triggerable displacement element and through-openings as pressure outlet openings, the displacement element protruding into the trench structure and being movable in parallel with the function levels, whereby positive and negative pressure pulses are generated, and
a third function level is implemented above the second function level and includes at least one triggerable cover element for at least one part of the pressure outlet openings in the second function level; and

a trigger arrangement, wherein the trigger arrangement and a suspension of the displacement element in the second function level permit one of a translatory movement and a rotatory movement in parallel to the function levels.

2. The MEMS component as recited in claim 1 , further comprising vent openings formed in the first function level.

3. The MEMS component as recited in claim 1 , wherein a triggering of the displacement element is at least one of electrostatic, piezoelectric, magnetostatic, and electromagnetic.

4. The MEMS component as recited in claim 1 , wherein the displacement element is bar-shaped and a length and a height of the bar-shaped displacement element are coordinated with a length and a depth of the trench structure.

5. A MEMS component for generating pressure pulses, comprising:
a micromechanical structure including at least three function levels, wherein:
a first function level includes at least one stationary trench structure,
a second function level is implemented above the first function level and includes at least one triggerable displacement element and through-openings as pressure outlet openings, the displacement element protruding into the trench structure and being movable in parallel with the function levels, whereby positive and negative pressure pulses are generated, and
a third function level is implemented above the second function level and includes at least one triggerable cover element for at least one part of the pressure outlet openings in the second function level; and

at least one spacer formed on at least one of the displacement element and the trench wall, the at least one spacer preventing the displacement element from adhering to the trench wall and ensuring a residual air cushion between the trench wall and the displacement element.

6. The MEMS component as recited in claim 1 , wherein the trigger arrangement and a suspension of the cover element in the third function level are designed for an in-plane movement within the third function level.

7. The MEMS component as recited in claim 1 , wherein the trigger arrangement and a suspension of the cover element in the third function level are designed for an out-of-plane movement perpendicular to the third function level.

8. The MEMS component as recited in claim 7 , wherein the cover element includes a triggerable rocker structure suspended via a torsion spring structure in the third function level and deflectable out of the third function level.

Assignees

• Bosch Gmbh Robert

Inventors

• Zoellin Jochen
• Ehrenpfordt Ricardo
• Scheben Rolf

Classifications

• B81B2203/05

  Type of movement · CPC title

• H04R19/02

  Loudspeakers (H04R19/01 takes precedence) · CPC title

• H04R2217/03

  Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves · CPC title

• H04R9/06

  Loudspeakers · CPC title

• B81B5/00

  Devices comprising elements which are movable in relation to each other, e.g. comprising slidable or rotatable elements · CPC title