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    • 20. 发明授权
    • Optical head device
    • 光头设备
    • US07724617B2
    • 2010-05-25
    • US11854134
    • 2007-09-12
    • Masaki Sasaki
    • Masaki Sasaki
    • G11B7/00
    • G11B7/1378G11B7/0909G11B7/1275
    • An optical head device may include a twin laser light source which is integrally provided with a first laser beam emitting element and a second laser beam emitting element, a light receiving element, and an optical system including an objective lens for converging a laser beam on an optical recording medium. The optical system is provided with a detection lens structured of a toric lens. The toric lens applies an astigmatic difference caused by a toric face to the one of the return light beams, and the toric lens applies the other of the return light beams an astigmatic difference caused by a toric face and astigmatism composed of astigmatism and curvature of image field caused by passing off-axis position to coincide a focusing position of the first laser beam with that of the second laser beam.
    • 光学头装置可以包括与第一激光束发射元件和第二激光束发射元件,光接收元件和光学系统整体设置的双激光光源,所述光学系统包括用于将激光束会聚在 光记录介质。 光学系统设置有由复曲面透镜构成的检测透镜。 复曲面透镜将复曲面施加散光差异到一个返回光束,并且复曲面透镜将另一个返回光束施加于由复曲面引起的散光差异和由像散和像差曲线组成的像散 通过使离轴位置与第一激光束的聚焦位置与第二激光束的聚焦位置一致而引起的场。