| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical information recording and reproducing device furnished with a stably recordable/reproducible optical head device by solving the problem in the conventional practice. SOLUTION: This device is constituted of a fixed optical system 5 which consists of a semiconductor laser, a collimator lens, a deflection beam splitter, an image forming lens and a photodetector, although these parts are not shown in figure, a wave front aberration correcting element 14 for correcting the disk tilt and the fluctuation in the thickness direction, a movable mirror 13 for deflecting a luminous flux and a reflected light from the fixed optical system 5, a fixed mirror 4 for deflecting the luminous flux from the movable mirror 13 to an objective lens 3, a lens holder 15 integrally constituting the objective lens 3 and the movable mirror 13, a fixed plate 17 for supporting the lens holder 15 by four pieces of spring shafts 16, and a control circuit 19 for changing the shape of the surface by applying the voltage to the wave front aberration correcting element 14, then, the above fixed optical system 5, the wave front aberration correcting element 14, the fixed mirror 4 and the fixed plate 17 are fixed to a head base which is not shown in figure. |
