Patent ID: 6606444
Filing Date: 2003-08-12
Classification: G02B

Abstract:
A positioning device including:a first support; a movable support adapted for movement relative to said first support with one degree of freedom and carrying holding means for an object to be positioned; an intermediate support which is connected to said first support by a pair of first spaced flexible elements of substantially equal length and which is connected to the movable support by a pair of second spaced flexible elements, said second flexible elements also being substantially equal in length to each other, said first and second flexible elements being oppositely arranged and being dimensioned so that arc-errors in the movement of the intermediate support caused by bending of said first flexible elements are substantially compensated by arc movements of said second flexible elements to produce a desired movement of the movable support; an actuator connected to cause movement of the movable support relative to the first support with bending of all said flexible elements; and control means connecting said first support, said intermediate support and the movable support so that the degree of movement of the intermediate support is one half the movement of the movable support.