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    • 23. 发明授权
    • Optical head
    • 光头
    • US06487016B1
    • 2002-11-26
    • US09129276
    • 1998-08-05
    • Teruhiro ShionoTetsuo Saimi
    • Teruhiro ShionoTetsuo Saimi
    • G02B2744
    • G11B7/1359G11B7/123G11B7/1275G11B7/1353G11B7/1362G11B2007/0006
    • An optical head comprises a light path alteration member (first surface of a first transparent substrate), a first grating element and a second grating element arranged in that order in a light path between a light source and an optical disk. A beam emitted by the light source passes a collimated lens, is deflected by total reflection from the light path alteration member, and enters the first grating element. Diffracted light enters a second grating element, and is focused on a recording medium by an objective lens. Wavelength variations in light diffracted by the first grating element and wavelength variations in light diffracted by the second grating element at least partially cancel each other out. Thus, a thin optical head for an optical recording medium is provided.
    • 光头包括在光源和光盘之间的光路中依次布置的光路改变构件(第一透明衬底的第一表面),第一光栅元件和第二光栅元件。 由光源发射的光束通过准直透镜,由光路改变构件的全反射偏转,并进入第一光栅元件。 衍射光进入第二光栅元件,并通过物镜聚焦在记录介质上。 由第一光栅元件衍射的光的波长变化和由第二光栅元件衍射的光的波长变化至少部分抵消。 因此,提供了一种用于光学记录介质的薄型光学头。