Patent ID: 6516146
Filing Date: 2003-02-04
Classification: F03G,F05B,F05C,G03B

Abstract:
The actuator using a shape memory alloy, comprising:an actuating member constructed of a shape memory alloy and in which a predetermined shape is memorized in advance; a driven member which is driven by the actuating member; a power supply which supplies electric power to the actuating member; and a control unit which controls so that the electric power is fed from the power supply to the actuating member to heat the actuating member, causing the actuating member to transform to the memorized shape and causing the driven member to move to a predetermined position, wherein the control unit variably controls the electric current fed from the power supply to the actuating member in correspondence with displacement of the driven member, and when the driven member is to be moved to the predetermined position, electric current having a value that is larger than the value of electric current necessary for positioning the driven member to the predetermined position is fed to the actuating member, to move the driven member.