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    • 10. 发明授权
    • Optical head and drive device for optical recording medium
    • 用于光学记录介质的光头和驱动装置
    • US06307689B1
    • 2001-10-23
    • US09581987
    • 2000-08-17
    • Isao IchimuraKoichiro KishimaKenji YamamotoKiyoshi Osato
    • Isao IchimuraKoichiro KishimaKenji YamamotoKiyoshi Osato
    • G02B702
    • G11B7/1374B82Y10/00G11B7/0901G11B7/0914G11B7/0925G11B7/131G11B7/1387G11B2007/13727
    • An optical head (1) having an optical means for focusing a laser beam to irradiate an optical recording medium (51) is equipped with an objective lens (2) focusing a laser beam L, and a solid immersion lens (3) disposed between the objective lens (2) and the optical recording medium (51), the head comprising a holder member (4) for integrally retaining the lenses (2) and (3) and a moving mechanism (5a) for moving the holder member in a direction along an optical axis of the lenses (2) and (3), wherein an electrically conductive material is used on a surface of the optical head facing the optical recording medium (51). The numerical aperture can be made large by the solid immersion lens (3). Moreover, the air gap can be controlled with high precision according to the electrostatic capacity formed between the electrically conductive material and the optical recording medium (51). Furthermore, the moving mechanism (5a) and the signal processing for the focus servo operation can be made simpler.
    • 具有用于聚焦激光束以照射光学记录介质(51)的光学装置的光学头(1)配备有聚焦激光束L的物镜(2)和设置在光学记录介质 物镜(2)和光记录介质(51),头部包括用于一体地保持透镜(2)和(3)的保持构件(4)和移动机构(5a) 沿着透镜(2)和(3)的光轴,其中在面向光学记录介质(51)的光学头的表面上使用导电材料。 可以通过固体浸没透镜(3)使数值孔径变大。 此外,可以根据导电材料和光记录介质(51)之间形成的静电电容,高精度地控制气隙。 此外,可以使移动机构(5a)和聚焦伺服操作的信号处理更简单。