DEFORMABLE MIRROR AND OPTICAL RECORDING AND REPRODUCING DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a deformable mirror which is strong against vibration and a temp. change by fixing a flexible member to be held in between a first substrate and a second substrate and changing over spherical abberations to be applied to light beams to be reflected on a reflection surface while making the member to be attracted to a first reference surface or a second reference surface by a driving device. SOLUTION: A deformable mirror 10 is constituted of a flexible member 1, the first substrate 4 of a lower side, the second substrate 6 of an upper side and a driving device 9. The flexible member 1 is made so that an elastic deformation is possible and has a reflection surface capable of reflecting light beams on its surface of one side. A first reference surface 4a capable of applying a spherial abberation to the light beams when the flexible member 1 is absorped to it is formed on the substrate 4. The substrate 6 is made of transparent material and a second reference surface 4b capable of applying a spherical abberation to the light beams when the flexible member 1 is attracted to it is formed on the substrate 6. The reference surface 4b has the curvature of a direction opposite to that of the reference surface 4a. The flexible member 1 is absorted to one side of either the reference surface 4a or the reference surface 4b by the absorption changeover of the driving device 9.