# US 12,216,258 B2 · Prism actuator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,216,258 B2 - Document ID: US12216258B2 - Status: Granted - Kind: B2 - Application number: 17/795,664 - Filed: 2021-02-04 - Published: 2023-03-09 - Granted: 2025-02-04 - Earliest claimed: 2020-02-06 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Sang Ok Park; Seong Min Lee - Web page: https://patentgrep.com/patent/US12216258B2 ## CPC - G02B 13/0065: {having a beam-folding prism or mirror} - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - G02B 7/1805: {for prisms (G02B7/181 takes precedence)} - G02B 26/0825: {the reflecting element being a flexible sheet or membrane, e.g. for varying the focus (flexible mirrors for cosmetic use A45D42/24)} - 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)} - G03B 5/00: Adjustment of optical system relative to image or object surface other than for focusing - G03B 17/17: with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera - G03B 30/00: Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles - G03B 2205/0023: by tilting or inclining one or more optical elements with respect to the optical axis - G03B 2205/003: by a prism with variable angle or the like - G03B 2205/0076: using shape memory alloys - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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 The present embodiment relates to a prism actuator comprising: a housing; a holder having at least a part spaced apart from the housing; a prism disposed on the holder; a shape memory alloy member for connecting the housing and the holder to each other; and an elastic member for connecting the housing and the holder to each other, wherein the shape memory alloy member comprises first and second shape memory alloy members disposed on one side of the prism, the first shape memory alloy member connects an upper part of the holder and a lower part of the housing to each other, and the second shape memory alloy member connects a lower part of the holder and an upper part of the housing to each other. ## Claims ### Claim 1 A prism actuator comprising: a housing; a holder disposed on the housing and tilted about a virtual first central axis; a prism disposed on the holder; a shape memory alloy member connecting the housing and the holder; an elastic member connecting the housing and the holder; and a substrate disposed on the housing, wherein the shape memory alloy member comprises first and second shape memory alloy members disposed at one side of the prism and third and fourth shape memory alloy members disposed at an other side of the prism, wherein the first shape memory alloy member connects an upper part of the holder and a lower part of the housing, wherein the second shape memory alloy member connects a lower part of the holder and an upper part of the housing, wherein the shape memory alloy member is electrically connected to the substrate through the elastic member, wherein the first central axis passes between the first and second shape memory alloy members and between the third and fourth shape memory alloy members, wherein the holder comprises: a first side surface to which the first and second shape memory alloy members are coupled; and a second side surface to which the third and fourth shape memory alloy members are coupled, wherein each of the first side surface and the second side surface of the holder is formed with a protrusion comprising a curved surface, and wherein the curved surface of the protrusion of the holder is disposed on the housing. ### Claim 2 (depends on 1) The prism actuator of claim 1, wherein the shape memory alloy member is coupled to the housing at one end and coupled to the holder at an other end. ### Claim 3 (depends on 1) The prism actuator of claim 1, wherein the shape memory alloy member comprises: a first coupling part coupled to the housing; a second coupling part coupled to the holder; and a connection part connecting the first coupling part and the second coupling part, and wherein at least a part of the connection part is formed of a shape memory alloy. ### Claim 4 (depends on 3) The prism actuator of claim 3, wherein the first coupling part of the shape memory alloy member is fixed to the housing by an adhesive. ### Claim 5 (depends on 3) The prism actuator of claim 3, wherein the second coupling part of the shape memory alloy member comprises a circular hole, and wherein the holder comprises a protrusion inserted into the hole of the second coupling part. ### Claim 6 (depends on 3) The prism actuator of claim 3, wherein the connection part comprises a shape memory alloy wire. ### Claim 7 (depends on 1) The prism actuator of claim 1, wherein the elastic member comprises a first coupling part coupled to the housing, a second coupling part coupled to the holder, a connection part connecting the first coupling part and the second coupling part, and a terminal part coupled to the substrate. ### Claim 8 (depends on 1) The prism actuator of claim 1, wherein the elastic member comprises an upper elastic member coupled to an upper surface of the holder, and a lower elastic member coupled to a lower surface of the holder. ### Claim 9 (depends on 1) The prism actuator of claim 1, comprising: a first damper disposed on a part of an upper surface of the holder that is spaced apart from the first central axis; and a second damper disposed on a part of a lower surface of the holder spaced apart from the first central axis. ### Claim 10 (depends on 1) The prism actuator of claim 1, wherein the first and fourth shape memory alloy members are disposed diagonally opposite to each other, and wherein the second and third shape memory alloy members are disposed diagonally opposite to each other. ### Claim 11 (depends on 1) A camera device comprising: a printed circuit board; an image sensor disposed on the printed circuit board; the prism actuator of claim 1; a lens disposed between the image sensor and the prism actuator; and a lens driving device configured to move the lens. ### Claim 12 (depends on 11) An optical device comprising: a main body; the camera device of claim 11 disposed on the main body; and a display module disposed on the main body and configured to output an image photographed by the camera device. ### Claim 13 A prism actuator comprising: a housing; a holder disposed on the housing; a prism disposed on the holder; a shape memory alloy member connecting the housing and the holder; an elastic member connecting the housing and the holder; and a substrate disposed on the housing, wherein the elastic member comprises a first coupling part coupled to the housing, a second coupling part coupled to the holder, a connection part connecting the first coupling part and the second coupling part, and a terminal part coupled to the substrate, and wherein the shape memory alloy member is electrically connected to the substrate through the elastic member. ### Claim 14 (depends on 13) The prism actuator of claim 13, wherein the shape memory alloy member comprises first and second shape memory alloy members disposed at one side of the prism, and wherein a length of the first shape memory alloy member decreases when a length of the second shape memory alloy member increases and increases when the length of the second shape memory alloy member decreases. ### Claim 15 (depends on 14) The prism actuator of claim 14, wherein the holder is tilted about a virtual first central axis, and wherein the first central axis passes between the first and second shape memory alloy members. ### Claim 16 A prism actuator comprising: a housing; a holder disposed on the housing and tilted about a virtual first central axis; a prism disposed on the holder; a shape memory alloy member connecting the housing and the holder; an elastic member connecting the housing and the holder; and a substrate disposed on the housing, wherein the shape memory alloy member comprises first and second shape memory alloy members disposed at one side of the prism and third and fourth shape memory alloy members disposed at an other side of the prism, wherein a length of the first shape memory alloy member decreases when a length of the second shape memory alloy member increases and increases when the length of the second shape memory alloy member decreases, wherein the shape memory alloy member is electrically connected to the substrate through the elastic member, wherein the first shape memory alloy member connects an upper part of the holder and a lower part of the housing, wherein the second shape memory alloy member connects a lower part of the holder and an upper part of the housing, wherein the shape memory alloy member is electrically connected to the substrate through the elastic member, wherein the first central axis passes between the first and second shape memory alloy members and between the third and fourth shape memory alloy members, wherein the holder comprises: a first side surface to which the first and second shape memory alloy members are coupled; and a second side surface to which the third and fourth shape memory alloy members are coupled, wherein each of the first side surface and the second side surface of the holder is formed with a protrusion comprising a curved surface, and wherein the curved surface of the protrusion of the holder is disposed on the housing.