Patent ID: 7128403
Filing Date: 2006-10-31
Classification: B41J

Abstract:
1. A microactuator using shape memory alloy, the microactuator comprising: a substrate in which a space portion is formed; and a vibration plate which is installed on an upper surface of the substrate to cover the space portion, including a first thin film formed of a shape memory alloy and at least a second thin film on which a compressive residual stress acts, wherein the vibration plate is initially transformed to bend to the space portion or to bend to be opposite to the space portion due to a bending moment caused by the compressive residual stress with respect to a first neutral axis, wherein, when the shape memory alloy is phase-transformed due to a rise in temperature, the vibration plate is transformed to bend to the space portion or to bend to be opposite to the space portion due to a bending moment occurring with respect to a second neutral axis that moves from the first neutral axis, and the vibration plate varies the area of a chamber in which fluid is stored, providing pressure to the fluid, and wherein the vibration plate comprises: