Impact drive type actuator

An impact drive type actuator comprising:

• a wire-shaped shape memory alloy (11, 21, 31) which contracts upon being electrified and heated,
• an insulating heat conductor (12, 22, 22A, 32A, 32B) which contacts said wire-shaped shape memory alloy, is pushed in one direction by said contracted wire-shaped shape memory alloy and releases the heat which is generated at said wire-shaped shape memory alloy,
• a drive circuit (16, 17, 41, 66) which instantaneously electrifies said wire-shaped shape memory alloy (71, 81) to make said wire-shaped shape memory alloy contract, and
• wherein said wire-shaped shape memory alloy makes said insulating heat conductor displace translationally by a predetermined distance from a first position when said wire-shaped shape memory alloy is electrified and contracts, and a pushing operation between said wire-shaped shape memory alloy and said insulating heat conductor makes said wire-shaped shape memory alloy extend by instantaneous dispersion (18) of heat which is stored by being electrified and thereby said insulating heat conductor is made to displace translationally to said first position.