# US 11,307,374 B2 · Lens device, imaging system, movable object, and control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,374 B2 - Document ID: US11307374B2 - Status: Granted - Kind: B2 - Application number: 16/386,642 - Filed: 2019-04-17 - Published: 2019-08-08 - Granted: 2022-04-19 - Earliest claimed: 2016-10-26 - Assignees: Sz Dji Technology Co., Ltd. - Applicants: Sz Dji Technology Co., Ltd. - Inventors: Takashi Koyama - Web page: https://patentgrep.com/patent/US11307374B2 ## CPC - G02B 7/021: {for more than one lens} - B64U 20/87: Mounting of imaging devices, e.g. mounting of gimbals - F16M 11/041: {Allowing quick release of the apparatus} - F16M 11/10: around a horizontal axis {(F16M11/12 takes precedence)} - F16M 11/123: {the axis of rotation intersecting in a single point, e.g. by using gimbals} - F16M 11/18: with mechanism for moving the apparatus relatively to the stand - F16M 11/2071: {for panning and rolling (F16M11/2078 takes precedence)} - F16M 13/00: Other supports for positioning apparatus or articles (heads thereof F16M11/02 {; undercarriages thereof F16M11/20} ; adapted to be stuck in the ground A45F3/44 {; sockets or holders for poles or posts E04H12/22}); Means for steadying hand-held apparatus or articles {(supports for measuring instruments G01D11/30; supports for casings of remote control switching devices H01H9/025)} - F16M 13/02: for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle - G02B 7/04: with mechanism for focusing or varying magnification - G02B 7/10: by relative axial movement of several lenses, e.g. of varifocal objective lens - G02B 7/102: {controlled by a microcomputer (cameras with interchangeable lenses G03B17/14)} - G03B 5/00: Adjustment of optical system relative to image or object surface other than for focusing - G03B 15/006: {Apparatus mounted on flying objects} - G03B 17/561: {Support related camera accessories} - H04N 23/51: Housings - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - H04N 23/60: Control of cameras or camera modules - B64U 10/11: Autogyros - B64U 10/25: Fixed-wing aircraft (VTOL aircraft B64U10/20) - B64U 2101/30: for imaging, photography or videography - F16M 2200/041: for balancing rotational movement of the head - F16M 2200/044: for balancing rotational movement of the undercarriage - G02B 15/145: {having five groups only} - G03B 2205/0015: by displacing one or more optical elements normal to the optical axis - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B64U: UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR - F16M: FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A lens device includes a first lens system including a first lens, a second lens system including a second lens, a moving member configured to move in an optical axis direction of the first lens, and a physical structure configured to move the first lens in the optical axis direction and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens. ## Claims ### Claim 1 A lens device comprising: a first lens system including a first lens; a second lens system including a second lens; and a cam ring configured to move the first lens in an optical axis direction of the first lens, wherein the cam ring moves in a direction opposite to a movement direction of a center of gravity of the lens device according to a movement of the first lens. ### Claim 2 (depends on 1) The lens device of claim 1, further comprising: a lens holding member configured to hold the first lens; a cam provided to one of the lens holding member and the cam ring; and a follower provided to another one of the lens holding member and the cam ring, the follower being configured to move along a cam surface of the cam to cause the lens holding member and the cam ring to move relative to each other. ### Claim 3 (depends on 1) The lens device of claim 1, wherein the cam ring includes a material having a specific gravity greater than a specific gravity of the first lens. ### Claim 4 (depends on 1) The lens device of claim 1, wherein the cam ring includes metal. ### Claim 5 (depends on 1) The lens device of claim 1, wherein the second lens system includes a single focus lens system. ### Claim 6 (depends on 1) The lens device of claim 1, wherein: the cam ring is a first cam ring; and the second lens system includes a zoom lens system; the lens device further comprising: a second cam ring configured to move the second lens in an optical axis direction of the second lens, wherein the second cam ring moves in a direction opposite to a movement direction of a center of gravity of the lens device according to a movement of the second lens. ### Claim 7 (depends on 6) The lens device of claim 6, further comprising: a lens holding member configured to hold the second lens; a cam provided to one of the lens holding member and the second cam ring, and a follower provided to another one of the lens holding member and the second cam ring, the follower being configured to move along a cam surface of the cam to cause the lens holding member and the second cam ring to move relative to each other. ### Claim 8 (depends on 6) The lens device of claim 6, wherein the second cam ring includes a material having a specific gravity greater than a specific gravity of the second lens. ### Claim 9 (depends on 6) The lens device of claim 6, wherein the second cam ring includes metal. ### Claim 10 (depends on 6) The lens device of claim 6, further comprising: a light amount adjustment mechanism configured to move together with the first lens and adjust an amount of light that passes through the first lens; wherein the second cam ring moves in a direction opposite to a movement direction of a center of gravity of the lens device according to movements of the second lens and the light amount adjustment mechanism. ### Claim 11 (depends on 10) The lens device of claim 10, wherein the light amount adjustment mechanism comprises: an aperture with a variable opening diameter; and an actuator configured to drive the aperture and modify the opening diameter of the aperture. ### Claim 12 (depends on 1) An imaging system comprising: the lens device of claim 1, and an imaging device configured to generate images based on light projected by the lens device to the imaging device. ### Claim 13 (depends on 12) The imaging system of claim 12, further comprising a carrier supporting at least one of the lens device or the imaging device. ### Claim 14 (depends on 13) The imaging system of claim 13, wherein the carrier supports the lens device and the imaging device such that a rotation axis for the lens device and the imaging device is within a predetermined range of distance from a center of gravity of a physical system that includes the lens device and the imaging device. ### Claim 15 (depends on 14) The imaging system of claim 14, wherein the rotation axis runs through the center of gravity of the physical system that includes the lens device and the imaging device. ### Claim 16 (depends on 13) A movable object comprising the imaging system of claim 13. ### Claim 17 (depends on 16) The movable object of claim 16, wherein the movable object is an unmanned aerial vehicle. ### Claim 18 (depends on 13) The imaging system of claim 13, further comprising: a holding arm attached to the carrier. ### Claim 19 A lens device comprising: a first lens system including a first lens; a second lens system including a second lens; a moving member configured to move in an optical axis direction of the first lens, the moving member including a material having a specific gravity greater than a specific gravity of the first lens; and a physical structure configured to: move the first lens in the optical axis direction, and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens. ### Claim 20 An imaging system comprising: a lens device including: a first lens system including a first lens; a second lens system including a second lens; a moving member configured to move in an optical axis direction of the first lens, the moving member including a material having a specific gravity greater than a specific gravity of the first lens; and a physical structure configured to: move the first lens in the optical axis direction, and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens; an imaging device configured to generate images based on light projected by the lens device to the imaging device; and a carrier supporting the lens device and the imaging device such that a rotation axis for the lens device and the imaging device is within a predetermined range of distance from a center of gravity of a physical system that includes the lens device and the imaging device.