Two-dimensional suspension

Abstract

A two-dimensional (2-D) suspension system consists of series of rhomboidal parallel leaf springs (RPLSs) each of which comprises plural leaf springs apart from one another and at least two rigid walls for fixing both ends of the leaf springs at the same fixing angle selected not to be a right angle and to be different from fixing angles of other rhomboidal parallel leaf springs. Plural rhomboidal parallel leaf springs are linked in series by connecting the rigid walls in such a way that faces of all the leaf springs are perpendicular to an imaginary plane. The 2-D suspension system suspends a movable body which is allowed translation in a plane only and which is restricted in other motions. The mass of the rigid body connecting two RPLSs is so small that the resonance of the rigid body hardly interferes with the motion of the movable body. The 2-D suspension system can hold the movable body at both sides thereof in symmetry. This symmetric 2-D suspension system is useful for a position control system, especially for an actuator of optical information read head which needs a tracking and focussing control of high precision without tilt of the optical axis.

Dependencies are inferred from the claim text.