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    • 10. 发明公开
    • 광 헤드 및 광 픽업
    • 光学头和光学拾取
    • KR1020020021598A
    • 2002-03-21
    • KR1020010054212
    • 2001-09-04
    • 소니 주식회사
    • 야마모토겐지오사토기요시마에다후미사다
    • G11B7/1378G11B7/1374G11B7/09
    • G11B7/1378G11B7/1374
    • PURPOSE: To provide an optical head having an achromatic lens. CONSTITUTION: The optical head 110 has achromatic lenses 11 and 12 on which the laser beam LB of a blue or a purple-blue color is made incident from a semiconductor laser, objective lenses 14 and 16 which condense the laser beam which transmitted through the achromatic lenses 11 and 12 on an optical disk 80, lens holders 18 and 19 which hold the achromatic lenses 11 and 12 and the objective lenses 14 and 16 so that their optical axes are made coincident, and actuators 13T and 15F which shift the lens holders 18 and 19 in the direction of the focus and/or tracking direction of the optical disk 80. The lens holders 18 and 19 are fixed mutually, and the lenses 11, 12 14 and 16 are shifted unitedly by the actuators 13T and 15F.
    • 目的:提供一种具有消色差透镜的光学头。 构成:光头110具有从半导体激光器入射蓝色或紫蓝色的激光束LB的消色差透镜11和12,其将透过无彩色的激光束进行冷凝的物镜14和16 在光盘80上的透镜11和12,保持消色差透镜11和12以及物镜14和16以使其光轴重合的透镜保持器18和19以及将透镜保持器18移动的致动器13T和15F 并且在光盘80的聚焦和/或跟踪方向的方向上是19。透镜保持器18和19被相互固定,并且透镜11,124和16被致动器13T和15F一体移动。