Patent ID: 7859167
Filing Date: 2010-12-28
Classification: B81B,G02B,H02N

Abstract:
1. A microactuator comprising: a base; a movable section capable of displacement relative to the base; an elastic supporting member for supporting the movable section so as to allow the movable section to make a displacement relative to the base along a vertical direction and a tilt relative to the base; and a plurality of driving sections for causing the movable section to be displaced relative to the base, wherein, the plurality of driving sections include a first driving section and a second driving section, and the elastic supporting member supports the movable section at a position intermediate between a first point of application of a first driving force which is exerted by the first driving section on the movable section and a second point of application of a second driving force which is exerted by the second driving section on the movable section, and assuming that: a spring modulus of a restoring force occurring in the elastic supporting member responsive to a displacement of the movable section relative to the base along the vertical direction is kz(N/m); a spring modulus of a restoration torque occurring in the elastic supporting member responsive to a tilt angle of the movable section relative to the base is kr(Nm/rad); and a distance between the first point of application and the second point of application is 2L(m), kz, kr, and L satisfy the relationship of: wherein the elastic supporting member comprises a beam, and the beam includes a turn-back portion at which a direction in which the beam extends is reversed, wherein the distance between the turn-back portion and the central portion of the movable section is longer than the distance between a position at which the elastic supporting member is connected to the base and a central portion of the movable section.