# US 10,768,019 B2 · Actuator and camera module including same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,768,019 B2 - Document ID: US10768019B2 - Status: Granted - Kind: B2 - Application number: 16/006,356 - Filed: 2018-06-12 - Published: 2019-05-30 - Granted: 2020-09-08 - Earliest claimed: 2017-11-24 - Assignees: Samsung Electro-Mechanics Co., Ltd. - Applicants: Samsung Electro-Mechanics Co., Ltd. - Inventors: Sang Hyun Min; Jae Hyung Lee - Web page: https://patentgrep.com/patent/US10768019B2 ## CPC - G01D 5/2033: {controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet} - G02B 27/64: Imaging systems using optical elements for stabilisation of the lateral and angular position of the image - G03B 3/10: Power-operated focusing - G03B 5/02: Lateral adjustment of lens - G03B 5/04: Vertical adjustment of lens; Rising fronts - G03B 13/36: Autofocus systems - 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 - 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 - 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) ## Abstract An actuator including a detection target disposed on a surface of a lens barrel, and a position detecting unit including two or more sensing coils and configured to detect a displacement of the detection target in a first direction perpendicular to an optical axis, wherein when the detection target moves in a second direction perpendicular to the optical axis, an area of overlap between each of the two or more sensing coils and the detection target is maintained constant. ## Claims ### Claim 1 An actuator, comprising: a detection target disposed on a surface of a lens barrel; and a position detecting unit comprising two or more sensing coils and configured to detect a displacement of the detection target in a first direction perpendicular to an optical axis, wherein when the detection target moves in a second direction perpendicular to the optical axis, an area of overlap between each of the two or more sensing coils and the detection target is maintained constant. ### Claim 2 (depends on 1) The actuator of claim 1, wherein the first direction corresponds to a direction perpendicular to a surface on which the two or more sensing coils are disposed. ### Claim 3 (depends on 1) The actuator of claim 1, wherein the second direction corresponds to a direction parallel with a surface on which the two or more sensing coils are disposed. ### Claim 4 (depends on 1) The actuator of claim 1, wherein the two or more sensing coils comprise a main-sensing coil and a sub-sensing coil. ### Claim 5 (depends on 4) The actuator of claim 4, wherein an inductance of the main-sensing coil is greater than that of the sub-sensing coil. ### Claim 6 (depends on 5) The actuator of claim 5, wherein the main-sensing coil and the sub-sensing coil are disposed to face the detection target. ### Claim 7 (depends on 5) The actuator of claim 5, wherein a range in which the detection target is movable in the second direction is positioned to overlap in a hollow portion of the main-sensing coil, and the sub-sensing coil is disposed inside the hollow portion of the main-sensing coil. ### Claim 8 (depends on 4) The actuator of claim 4, wherein the main-sensing coil is disposed to face the detection target, and the sub-sensing coil is disposed outside a range in which the detection target is movable in the second direction. ### Claim 9 (depends on 4) The actuator of claim 4, wherein a range in which the detection target is movable in the second direction is positioned to overlap in a hollow portion of the main-sensing coil, and the sub-sensing coil is disposed outside of the hollow portion of the main-sensing coil. ### Claim 10 An actuator, comprising: a detection target disposed on a surface of a lens barrel; an oscillating unit comprising two or more oscillation circuits, each of the two or more oscillation circuits comprising a sensing coil; and a detecting unit configured to calculate a position of the detection target in a first direction perpendicular to an optical axis in response to a difference between frequencies of two or more oscillation signals output from the two or more oscillation circuits, respectively, wherein when the detection target moves in a second direction perpendicular to the optical axis, the frequencies of the two or more oscillation signals are maintained constant. ### Claim 11 (depends on 10) The actuator of claim 10, wherein the two or more sensing coils comprise a main-sensing coil and a sub-sensing coil, and when the detection target moves in the second direction, an area of overlap between each of the main-sensing coil and the sub-sensing coil and the detection target is maintained constant. ### Claim 12 (depends on 11) The actuator of claim 11, wherein an inductance of the main-sensing coil is greater than that of the sub-sensing coil. ### Claim 13 (depends on 12) The actuator of claim 12, wherein the main-sensing coil and the sub-sensing coil are disposed to face the detection target. ### Claim 14 (depends on 12) The actuator of claim 12, wherein a range in which the detection target is movable in the second direction is positioned to overlap in a hollow portion of the main-sensing coil, and the sub-sensing coil is disposed inside the hollow portion of the main-sensing coil. ### Claim 15 (depends on 11) The actuator of claim 11, wherein the main-sensing coil is disposed to face the detection target, and the sub-sensing coil is disposed outside a range in which the detection target is movable in the second direction. ### Claim 16 (depends on 11) The actuator of claim 11, wherein a range in which the detection target is movable in the second direction is positioned to overlap in a hollow portion of the main-sensing coil, and the sub-sensing coil is disposed outside of the hollow portion of the main-sensing coil. ### Claim 17 An actuator, comprising: a first detection target disposed on a lateral surface of a body and a second detection target disposed on an other surface of the body; and a detecting unit comprising two or more first sensing coils configured to detect a displacement of the first detection target perpendicular to the lateral surface and two or more second sensing coils configured to detect a displacement of the second detection target perpendicular to the other surface, wherein overlap area of the first detection target with the first sensing coils remains constant when the body moves perpendicular to the lateral surface and overlap area of the second detection target with the second sensing coils remains constant when the body moves perpendicular to the other surface. ### Claim 18 (depends on 17) The actuator of claim 17, wherein the body comprises a lens barrel comprising an optical axis parallel to the lateral surface and the other surface. ### Claim 19 (depends on 17) The actuator of claim 17, wherein the two or more first sensing coils comprise coils of different inductances, and wherein the two or more second sensing coils comprise coils of different inductances. ### Claim 20 (depends on 17) The actuator of claim 17, further comprising a computing unit configured to receive oscillation signals from circuits comprising the first and second sensing coils, and to output a frequency corresponding to each received signal, wherein the detecting unit is further configured to calculate a position of the body in a direction perpendicular to the lateral surface in response to a difference between frequencies corresponding to the two or more first sensing coils, and in a direction perpendicular to the other surface in response to a difference between frequencies corresponding to the two or more second sensing coils.