| 摘要 |
<P>PROBLEM TO BE SOLVED: To thin an apparatus by minimizing an operation range in the focusing direction. <P>SOLUTION: An objective lens drive apparatus 8 is provided with a fixed block 11, a movable block 12 holding a first objective lens 24 converging a laser beam on a recording plane of a blue ray disk 100c and a second objective lens 25 converging a laser beam on a recording plane of a compact disk 100b or a digital versatile disk 100a, while operated to at least two directions of the focusing direction and the tracking direction for the fixed block, supporting springs 16, 16 coupling to the fixed block and the movable block, a neutral position of the movable block in the focusing direction at the time of recording or reproduction of an information signal for the blue ray disk is set between a neutral position of the movable block in the focusing direction at the time of recording or reproduction of an information signal for the compact disk and a neutral position of the movable block in the focusing direction at the time of recording or reproduction of an information signal for the digital versatile disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
