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    • 16. 发明授权
    • Optical head unit for guiding a light beam more reliable to a center of
a track of an optical disk
    • 用于将光束引导到光盘的轨道的中心更可靠的光学头单元
    • US5729521A
    • 1998-03-17
    • US617629
    • 1996-03-19
    • Hideki Otsuka
    • Hideki Otsuka
    • G11B7/085G11B7/09G11B7/135G11B7/00
    • G11B7/1362G11B7/0901G11B7/0929G11B7/08564G11B7/0927
    • In an optical head unit, a reflection mirror for reflecting a light beam emitted from a laser element to an optical disk is rotated about a predetermined point which is on one of an extended portion of a first optical axis extending between the laser element and the mirror and an extended portion of a second optical axis extending between the mirror and the optical disk. A center of gravity of a movable section of the mirror is located closer to the optical disk than a reflection point of a reflection surface of the mirror, which intersects the first optical axis and the second optical axis and at the same time is located more remote from the laser element than the reflection point. Alternatively, the center of gravity of the movable section is located closer to the laser element than the reflection point and more remote from the optical disk than the reflection point.
    • 在光头单元中,用于将从激光元件发射的光束反射到光盘的反射镜围绕在激光元件和镜之间延伸的第一光轴的延伸部分中的一个上的预定点旋转 以及在反射镜和光盘之间延伸的第二光轴的延伸部分。 反射镜的可动部的重心比反射镜的反射面的反射点更靠近光盘,该反射面与第一光轴和第二光轴相交,并且同时位于更远的位置 从激光元件比反射点。 或者,可动部的重心比反射点更靠近激光元件,并且比反射点更靠近光盘。