| 摘要 |
PROBLEM TO BE SOLVED: To enhance productivity through reduction in the number of manufacturing processes, by improving the fixed structure of a diffraction grating in an optical pickup and thereby increasing precision of distance from the light emission point of a laser diode to the diffraction grating. SOLUTION: A coil spring is interposed between the diffraction grating holder and the small diameter part of the frame in the optical pickup, thereby deciding a distance from the light emission point of an optical beam to the diffraction grating by only the manufacturing precision of the diffraction grating holder, increasing precision in dividing three beams on the optical disk, reducing the manufacturing/assembling/adjusting operation, and thus enhancing the productivity. |
