| 摘要 |
PURPOSE:To simplify the exchange of semiconductor lasers, by unifying a semiconductor laser and a collimator lens with the interchangeability secured between them. CONSTITUTION:For a parallel beam generating parts 11, a semiconductor laser 1 and a collimator lens 3 are incorporated into a cylindrical case 12. The parts 11 is previously adjusted so that the light passed through the lens 3 is turned into parallel beams which are parallel to the optical axis of the lens 3. Then the parts 11 is put into a hole 15 of a case 10 of the pickup main body, and a positioning pin 14 is fitted at a recess part 16 and then attached removably into a screw hole 18 of the case 10 by means of a screw 17. In such a way, the laser 1 can be simply exchanged. |
