Optical pickup device and wavelength selective diffraction grating

发明授权

US06181668B2 Optical pickup device and wavelength selective diffraction grating 失效

标题翻译：光学拾取装置和波长选择性衍射光栅

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专利标题： Optical pickup device and wavelength selective diffraction grating
专利标题（中）： 光学拾取装置和波长选择性衍射光栅
申请号： US09125987

申请日： 1998-08-28
公开(公告)号： US06181668B2

公开(公告)日： 2001-01-30
发明人: Seiji Kajiyama , Yasuyuki Kanou , Masato Yamada , Yoichi Tsuchiya , Shuichi Ichiura
申请人： Seiji Kajiyama , Yasuyuki Kanou , Masato Yamada , Yoichi Tsuchiya , Shuichi Ichiura
优先权： JP8-256255 19960927; JP8-309373 19961120; JP8-350026 19961227
主分类号： G11B712
IPC分类号： G11B712

$Optical pickup device and wavelength selective diffraction grating$

摘要：

The optical pickup device includes a two wavelength semiconductor laser (23) selectively generating a laser beam having the wavelength of 635 nm and laser beam having the wavelength of 780 nm, a collimator lens (24), a hologram (25) formed on a surface of collimator lens (24), a polarizing glass (22) having an annular polarizing region (40) and an objective lens (21). Hologram (25) does not diffract the laser beam having the wavelength of 635 nm, and diffracts outward the laser beam having the wavelength of 780 nm. Therefore, virtual light source of the laser beam having the wavelength of 780 nm comes closer to the collimator lens (24) than the light source of the laser beam having the wavelength of 635 nm. Therefore, objective lens (21) focuses the laser beam having the wavelength of 635 nm on a recording surface of a transparent substrate (31) of a DVD, and focuses the laser beam having the wavelength of 780 nm on a recording surface of a transparent substrate (32) of a CD-R. Accordingly, the optical pickup device is capable of reproducing both DVD and CD-R having transparent substrates of different thicknesses.

摘要（中）：

光拾取装置包括选择性地产生波长为635nm的激光束和波长为780nm的激光束的双波长半导体激光器（23），准直透镜（24），形成在表面上的全息图（25）准直透镜（24），具有环形偏振片（40）和物镜（21）的偏光玻璃（22）。全息图（25）不会衍射具有635nm波长的激光束，并向外衍射具有780nm波长的激光束。因此，具有波长为780nm的激光束的虚拟光源比具有635nm波长的激光束的光源更靠近准直透镜（24）。因此，物镜（21）将具有635nm波长的激光束聚焦在DVD的透明基板（31）的记录表面上，并将具有780nm波长的激光束聚焦在透明的记录表面上 CD-R的底物（32）。因此，光学拾取装置能够再现具有不同厚度的透明衬底的DVD和CD-R。

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