| 摘要 |
PURPOSE:To easily perform the positioning with high accuracy by holding the light dividing device at the pickup base with the light dividing device holder, and providing the displacing means to displace the holder along the sensor optical system optical axis and the turning means to turn the holder around the sensor optical system optical axis. CONSTITUTION:In a light dividing device holder 2, a light dividing device 2 is incorporated, and further, to displace it along a sensor optical system optical axis 4a, a groove 2b in the direction vertical to the optical axis 4a is formed. By engaging an eccentric screw 11 screwed to a screw hole 1c with 11a formed at a pickup base 1 as a axis center, at the groove 2b and rotating the eccentric screw 11, the light dividing device holder 2 is displaced along the sensor optical system optical axis 4a. At the outer circumferential part of the light dividing device holder 2, notches 2b and 2c symmetrical to the center line are formed, and by screw holes 1d and 1e with the same axis centers 12a and 13a formed at the pickup base 1 as the axis and adjusting screws 12 and 13 screwed at the screw hole, the light dividing device holder 2 is turned and displaced. |
