| 摘要 |
PURPOSE:To move the light convergence part in the directions of X - Z axes direction, to rotate it around the X - Z axes and to adjust the focal length of the telescope and the phase shift between the light convergence part and a light receiving part on a track by providing driving parts constituted of piezoelectric elements on the fitting part of the light convergence part, and expanding/contracting the piezoelectric elements. CONSTITUTION:The light convergence part 2 is supported by two driving parts 1A at both X-axial ends and two driving parts 1B at both Y-axial ends loosely from a telescope lens barrel 10. Fitting parts 10A are provided on the four places of the internal wall of the lens barrel 10 on the X and Y axes and a piezoelectric element 4A which extends/contracts in the Z-axial direction of the telescope and the piezoelec tric element 4B which extends/contracts in the circumferential direction are fitted to the fitting plates 10A through on-rod elastic bodies 3. Therefore, the piezoelectric elements 4A and 4B of the driving parts 1A and 1B are controlled with an external voltage to move the light convergence part in the directions of the X - Z axes and also rotate it around the X - Z axes. Consequently, defocusing between the light conver gence 2 and the light receiving part of the telescope can be corrected. |
