| 摘要 |
To improve the reliability to an environmental temperature change of an optical pickup, an optical pickup 7 has a semiconductor laser 711 for generating a laser beam. An objective lens drive leads the laser beam to a predetermined position of a disk. The semiconductor laser and objective lens drive are mounted on a pickup hosing 70 . The objective lens drive has a movable portion 74 and the movable portion has an objective lens 716 for condensing the laser beam on the recording face of the disk. A fixed portion 72 holds the movable portion through a support member. The fixed portion has a magnetic yoke 75 . An extended portion formed by extending a part of the yoke to the fixed portion side and the upside 72 b of a cutout formed at the intermediate portion of the fixed portion in the tracking direction are adhered and fixed.
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