Prism actuator

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.

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.