# US 10,768,438 B2 · Optical element driving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,768,438 B2 - Document ID: US10768438B2 - Status: Granted - Kind: B2 - Application number: 16/402,936 - Filed: 2019-05-03 - Published: 2019-08-22 - Granted: 2020-09-08 - Earliest claimed: 2016-08-04 - Assignees: TDK Taiwan Corp. - Applicants: TDK Taiwan Corp. - Inventors: Ichitai Moto; Yi-Liang Chan - Web page: https://patentgrep.com/patent/US10768438B2 ## CPC - G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)} - G02B 7/023: {permitting adjustment} - G02B 7/08: adapted to co-operate with a remote control mechanism - G03B 5/04: Vertical adjustment of lens; Rising fronts - G03B 13/36: Autofocus systems - G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)} - G02B 7/09: adapted for automatic focusing or varying magnification - G03B 2205/0015: by displacing one or more optical elements normal to the optical axis - G03B 2205/0069: using electromagnetic actuators, e.g. voice coils - H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements - H02K 41/0356: {moving along a straight path} - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An optical element driving device is provided, including a fixed part including a base; a movable part including a holder for carrying an optical element, a first driving mechanism configured to drive the holder to move along a first direction with respect to the base, and a position sensing assembly including a magnetic element and a magnetic field sensing element in corresponding positions and configured to sense the amount of displacement of the holder along the first direction with respect to the base, wherein the position sensing assembly and the magnetic element do not overlap with each other when viewed along a direction perpendicular to the first direction. ## Claims ### Claim 1 An optical element driving device, comprising: a fixed part including a base; a movable part including a holder for carrying an optical element; a first driving mechanism configured to drive the holder to move along a first direction with respect to the base; and a position sensing assembly including a magnetic element and a magnetic field sensing element in corresponding positions and configured to sense the amount of displacement of the holder along the first direction with respect to the base, wherein a second direction is perpendicular to the first direction, and a third direction is perpendicular to the first direction and the second direction, the magnetic field sensing element and the magnetic element are arranged in the second direction when viewed from the first direction, and the magnetic field sensing element does not overlap the magnetic element when viewed along the second direction and the third direction. ### Claim 2 (depends on 1) The optical element driving device as claimed in claim 1, wherein the first driving mechanism includes a first driving coil and a driving magnetic element in corresponding positions, the magnetic element has two magnetic poles aligned in a magnetic pole direction, and the magnetic pole direction of the driving magnetic element is different from that of the magnetic element. ### Claim 3 (depends on 1) The optical element driving device as claimed in claim 1, wherein the fixed part further includes an image sensing module including a circuit substrate and an image sensing element, and the image sensing element and the magnetic field sensing element are disposed on the circuit substrate. ### Claim 4 (depends on 1) The optical element driving device as claimed in claim 1, wherein the first driving mechanism includes a first driving coil and a driving magnetic element in corresponding positions, and wherein the holder has a protrusion on an outer peripheral surface of the holder, the first driving coil is disposed on a side of the protrusion, and the protrusion is located between the magnetic element and the magnetic field sensing element. ### Claim 5 (depends on 1) The optical element driving device as claimed in claim 1, wherein the magnetic field sensing element is a Giant Magneto Resistance sensor or a Tunneling Magneto Resistance sensor. ### Claim 6 (depends on 1) The optical element driving device as claimed in claim 1, wherein the magnetic field sensing element determines the amount of displacement of the holder with respect to the base by sensing changes in the direction of the magnetic field from the magnetic element. ### Claim 7 (depends on 6) The optical element driving device as claimed in claim 6, wherein the magnetic element and the magnetic field sensing element do not overlap when viewed along the first direction. ### Claim 8 (depends on 6) The optical element driving device as claimed in claim 6, wherein the position sensing assembly further includes a plurality of magnetic elements and a plurality of magnetic field sensing elements in corresponding positions, wherein the magnetic field sensing elements are arranged in a second direction that is different from the first direction, and the magnetic field sensing elements are respectively configured to sense an amount of displacement of a plurality of portions of the holder in the first direction with respect to the base. ### Claim 9 (depends on 6) The optical element driving device as claimed in claim 6, wherein the first driving mechanism includes a first driving coil and a driving magnetic element in corresponding positions, and the magnetic field sensing element and the magnetic element are partially overlapping when viewed from a direction that is perpendicular to the first direction. ### Claim 10 (depends on 9) The optical element driving device as claimed in claim 9, wherein the base is rectangular, the driving magnetic element is located on a side of the base, and the magnetic element is located at a corner of the base. ### Claim 11 (depends on 9) The optical element driving device as claimed in claim 9, wherein the base is rectangular, the driving magnetic element is located at a corner of the base, and the magnetic element is located on a side of the base. ### Claim 12 (depends on 9) The optical element driving device as claimed in claim 9, wherein the first driving mechanism further includes a plurality of driving magnetic elements, and the driving magnetic elements comprises a first driving magnetic element and a second driving magnetic element having different shapes, and a distance between the first driving magnetic element and the magnetic element is different from a distance between the second driving magnetic element and the magnetic element. ### Claim 13 (depends on 6) The optical element driving device as claimed in claim 6, wherein the magnetic field sensing element is disposed on the base to sense the amount of displacement of the holder along the first direction with respect to the base, and the first direction is parallel to an optical axis of the optical element. ### Claim 14 (depends on 13) The optical element driving device as claimed in claim 13, wherein the first driving mechanism includes a first driving coil and a driving magnetic element, the optical element driving device further comprises a second driving mechanism including a second driving coil and the driving magnetic element in corresponding positions, wherein the second driving coil is disposed on the fixed part, the driving magnetic element is disposed on the movable part, and the second driving mechanism is configured to drive the movable part to move along a second direction with respect to the base, wherein the second direction is different from the first direction. ### Claim 15 (depends on 14) The optical element driving device as claimed in claim 14, wherein the fixed part further includes a circuit substrate disposed on the base, and the second driving coil and the magnetic field sensing element are disposed on the circuit substrate. ### Claim 16 An optical element driving device, comprising: a fixed part including a base; a movable part including a holder for carrying an optical element; a first driving mechanism including a first driving coil and a driving magnetic element in corresponding positions and configured to drive the holder to move along a first direction with respect to the base; and a position sensing assembly including a magnetic element and a magnetic field sensing element in corresponding positions and configured to sense the amount of displacement of the holder along the first direction with respect to the base, wherein a second direction is perpendicular to the first direction, and a third direction is perpendicular to the first direction and the second direction, the magnetic field sensing element and the magnetic element are arranged in the second direction when viewed from the first direction the magnetic field sensing element does not overlap the magnetic element when viewed along the second direction and the third direction. ### Claim 17 (depends on 16) The optical element driving device as claimed in claim 16, wherein the magnetic element has two magnetic poles aligned in a magnetic pole direction, the magnetic pole direction of the driving magnetic element is different from the first direction. ### Claim 18 (depends on 16) The optical element driving device as claimed in claim 16, wherein the magnetic element is disposed on the holder, and the magnetic field sensing element is disposed on the base. ### Claim 19 (depends on 18) The optical element driving device as claimed in claim 18, wherein the magnetic field sensing element includes a package body having a top surface and a mounting surface opposite to each other, and the mounting surface is connected to the base, wherein the magnetic field sensing element is configured to sense the magnetic element's magnetic field strength changes parallel to the top surface. ### Claim 20 (depends on 18) The optical element driving device as claimed in claim 18, wherein the magnetic element and the magnetic field sensing element do not overlap when viewed along the first direction.