# US 10,871,646 B2 · Micromirror device and method for operating a micromirror device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,646 B2 - Document ID: US10871646B2 - Status: Granted - Kind: B2 - Application number: 16/324,616 - Filed: 2017-08-30 - Published: 2019-06-13 - Granted: 2020-12-22 - Earliest claimed: 2016-09-07 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Frank Schatz; Helmut Grutzeck; Joerg Muchow - Web page: https://patentgrep.com/patent/US10871646B2 ## CPC - G02B 26/0858: {the reflecting means being moved or deformed by piezoelectric means} - G02B 26/08: for controlling the direction of light (in light guides G02B6/35) - G02B 26/0833: {the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD (G02B26/0825 takes precedence; micromechanical devices in general B81B)} - G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)} - G02B 26/105: {with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A micromirror device, including a substrate and an outer frame element, which is connected to the substrate along a first oscillating axis with the aid of a first suspension device, and is deflectable about the first oscillating axis. In addition, the micromirror device includes an inner frame element, which is connected to the outer frame element along the first oscillating axis with the aid of a second suspension device; as well as an oscillating plate, which includes a micromirror and is connected to the inner frame element along a second oscillating axis, with the aid of a third suspension device; the first oscillating axis being perpendicular to the second oscillating axis. The inner frame element includes displaceable deflection elements, the oscillating plate being deflectable by displacing the deflection elements relative to the outer frame element. ## Claims ### Claim 1 A micromirror device, comprising: a substrate; an outer frame element, which is connected to the substrate along a first oscillating axis, using a first suspension device, and is deflectable about the first oscillating axis; an inner frame element, which is connected to the outer frame element along the first oscillating axis, using a second suspension device; and an oscillating plate, which includes a micromirror and is connected to the inner frame element along a second oscillating axis, using a third suspension device, the first oscillating axis being perpendicular to the second oscillating axis; wherein the inner frame element includes displaceable deflection elements, and the oscillating plate is deflectable by displacing the deflection elements relative to the outer frame element, wherein the deflection elements each include a beam element running parallelly to the second oscillating axis in an undeflected state, and an inertial mass positioned on the beam element, and wherein the beam elements taper towards their outer end region. ### Claim 2 (depends on 1) The micromirror device as recited in claim 1, wherein the deflection elements include first deflection elements and second deflection elements, the first deflection elements are positioned on the inner frame element symmetrically to the second oscillating axis with respect to the second deflection elements, and wherein by oppositely directed displacement of the first deflection elements relative to the second deflection elements, the oscillating plate may be set into oscillation about the second oscillating axis. ### Claim 3 (depends on 1) The micromirror device as recited in claim 1, wherein the substrate has a cavity, and the first suspension device has a first suspension element and a second suspension element, which connect the substrate to the outer frame element on opposite sides of the cavity, along the first oscillating axis. ### Claim 4 (depends on 1) The micromirror device as recited in claim 1, wherein the second suspension device has a third suspension element and a fourth suspension element, which connect the outer frame element to the inner frame element on opposite sides of the oscillating plate along the first oscillating axis. ### Claim 5 (depends on 1) The micromirror device as recited in claim 1, wherein the third suspension device has a fifth suspension element and a sixth suspension element, which connect the inner frame element to the oscillating plate on opposite sides of the oscillating plate, along the second oscillating axis. ### Claim 6 (depends on 1) The micromirror device as recited in claim 1, wherein the inertial mass is situated in an outer end region of the beam elements. ### Claim 7 (depends on 1) The micromirror device as recited in claim 1, wherein the deflection elements have at least one piezoelectric layer. ### Claim 8 A method for operating a micromirror device, the micromirror device including a substrate, an outer frame element, which is connected to the substrate along a first oscillating axis, using a first suspension device, and is deflectable about the first oscillating axis, an inner frame element, which is connected to the outer frame element along the first oscillating axis, using a second suspension device, and an oscillating plate, which includes a micromirror and is connected to the inner frame element along a second oscillating axis, using a third suspension device, the first oscillating axis being perpendicular to the second oscillating axis, wherein the inner frame element includes displaceable deflection elements, and the oscillating plate is deflectable by displacing the deflection elements relative to the outer frame element, the method comprising: deflecting the outer frame element about the first oscillating axis; and deflecting the oscillating plate relative to the outer frame element by displacing the deflection elements, wherein the deflection elements each include a beam element running parallelly to the second oscillating axis in an undeflected state, and an inertial mass positioned on the beam element, and wherein the beam elements taper towards their outer end region.