US 12,216,258 B2
Prism actuator
Sang Ok Park, Seoul (KR); and Seong Min Lee, Seoul (KR)
Assigned to LG INNOTEK CO., LTD., Seoul (KR)
Appl. No. 17/795,664
Filed by LG INNOTEK CO., LTD., Seoul (KR)
PCT Filed Feb. 4, 2021, PCT No. PCT/KR2021/001465
§ 371(c)(1), (2) Date Jul. 27, 2022,
PCT Pub. No. WO2021/158033, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 10-2020-0014405 (KR), filed on Feb. 6, 2020.
Prior Publication US 2023/0072601 A1, Mar. 9, 2023
Int. Cl. G02B 13/00 (2006.01); G02B 7/18 (2021.01); G02B 26/08 (2006.01); G03B 5/00 (2021.01); G03B 30/00 (2021.01)
CPC G02B 13/0065 (2013.01) [G02B 7/1805 (2013.01); G02B 26/0825 (2013.01); G03B 5/00 (2013.01); G03B 30/00 (2021.01); G03B 2205/003 (2013.01); G03B 2205/0076 (2013.01)] 16 Claims
OG exemplary drawing
 
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.