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    • 22. 发明申请
    • OPTICAL HEAD DEVICE
    • 光头设备
    • US20080239927A1
    • 2008-10-02
    • US12058962
    • 2008-03-31
    • Masaki SasakiIzumi KomatsuTadashi Takeda
    • Masaki SasakiIzumi KomatsuTadashi Takeda
    • G11B7/135
    • G11B7/1395G11B7/1275G11B7/1365G11B7/1378G11B7/13922G11B7/1398
    • An optical head device may include a polarization conversion element disposed on a common optical path for guiding a first and a second laser beams to a common objective lens for converting the first and the second laser beams to a circularly polarized light from a linearly polarized light, and a ½-wavelength plate disposed on an optical path of the first laser beam from a first laser light source to the common optical path for adjusting a polarization plane direction of the first laser beam. A polarization plane direction of the first laser beam incident on the polarization conversion element from the first laser light source is adjusted by the ½-wavelength plate in a direction so that the linearly polarized light is converted into the circularly polarized light.
    • 光学头装置可以包括设置在公共光路上的偏振转换元件,用于将第一和第二激光束引导到用于将第一和第二激光束从线性偏振光转换成圆偏振光的公共物镜, 以及设置在第一激光束从第一激光光源到共用光路的光路上的1/2波长板,用于调整第一激光束的偏振面方向。 入射到来自第一激光光源的偏振转换元件的第一激光束的偏振面方向通过1/2波长板沿使得线偏振光转换成圆偏振光的方向被调节。
    • 25. 发明申请
    • OPTICAL HEAD DEVICE
    • 光头设备
    • US20080062528A1
    • 2008-03-13
    • US11851001
    • 2007-09-06
    • Masaki SasakiKai Suo
    • Masaki SasakiKai Suo
    • G02B27/14
    • G11B7/1275G11B7/1362G11B7/1378G11B7/13922G11B2007/0006
    • An optical head device may include a laser light source, an objective lens for converging a laser beam emitted from the laser light source on an optical recording medium, a parallel planar half mirror which is disposed on an optical path directing from the laser light source to the optical recording medium and which partially transmits the laser beam emitted from the laser light source diagonally as a divergent beam, and an aberration correcting element for correcting aberration which is occurred when the laser beam before converged on the optical recording medium is transmitted through the half mirror. Since the aberration correcting element is disposed on an optical path directing from the laser light source to the optical recording medium, a satisfactory spot can be formed on an optical recording medium.
    • 光学头装置可以包括激光光源,用于将从激光光源发射的激光束会聚在光学记录介质上的物镜,平行平面半反射镜,其设置在从激光源指向的光路上 光学记录介质,其部分地透射从激光光源发射的激光束作为发散光束;以及像差校正元件,用于校正在会聚在光记录介质上之前的激光束时发生的像差,半像素 镜子。 由于像差校正元件设置在从激光光源引导到光学记录介质的光路上,所以可以在光记录介质上形成令人满意的光点。