| 摘要 |
PURPOSE:To facilitate a focus adjustment by fitting directly a hologram to an opto-base and fitting slidably a laser diode holder to the opto-base in a light axis direction. CONSTITUTION:The focus adjustment at the time of assembling an optical pick-up is executed by moving and adjusting a laser diode holder 10 in the light axis direction. At such a time, since the hologram 2 is not moved, the dislocation of a diffracted light central line L at the hologram 2 does not occur and the movement of the spot on a light detector 5 does not occur. Consequently, the focus adjustment is facilitated. |
