| 摘要 |
PURPOSE:To improve the working efficiency for disassembling and assembling processes and to facilitate an easy maintenance job, by providing a hollow yoke setting part for both tracking and focusing coils at the supporting part for an objective lens. CONSTITUTION:A hollow yoke setting part 29 is secured at the lower source side of a large diameter part 3a of a lens holder 3 to contain a yoke 28 for both focusing and tracking coils 26 and 27. Here the both ends of the yoke 28 are connected to a base 17 and permanent magnets 33 and 34 share the yoke 28 to form the focusing the tracking magnetic circuits respectively. The holder 3 and both coils 26 and 27 fixed to the holder 3 can be removed in a body just by detaching a fixing screw 43. In such a way, the disassembling and assembling jobs of an objective lens driving part is simplified considerably. |
