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    • 9. 发明申请
    • Optical pickup apparatus
    • 光拾取装置
    • US20090196149A1
    • 2009-08-06
    • US11663431
    • 2006-11-06
    • Yuichi AtarashiKohei OtaJunji HashimuraKiyono Ikenaka
    • Yuichi AtarashiKohei OtaJunji HashimuraKiyono Ikenaka
    • G11B7/00
    • G11B7/1374G11B7/08517G11B7/1275G11B7/1353G11B7/1378G11B7/13922G11B7/13925G11B7/1398G11B2007/0006G11B2007/13727
    • In order to provide an optical pickup apparatus that has a relatively simple configuration and that can carry out recording and/or reproduction of information in a s compatible manner for different optical information storage medium, the optical surface of the first objective lens OBJ1 is formed only by a refracting surface, and hence it is possible to form it at a low cost even if it is made of glass. In addition, said first objective lens OBJ1 can be designed by optimizing it for the first light flux with the wavelength λ1 and the protective substrate t1 of said first optical disk OD1. On the other hand, while the second objective lens OBJ2 is used commonly for both the first light flux with a wavelength λ1 and the second light flux with a wavelength λ2, when the protective substrate t2 of the second optical disk OD2 and the protective substrate t3 of the third optical disk OD3 are the same, there is no need to consider the difference in the thickness of the protective substrate, and hence the design is easy and it is possible to produce at a low cost.
    • 为了提供具有相对简单的配置并且可以以不同的光学信息存储介质的兼容方式进行信息的记录和/或再现的光学拾取装置,第一物镜OBJ1的光学表面仅由 折射表面,因此即使由玻璃制成也可以低成本地形成。 此外,所述第一物镜OBJ1可以通过对具有波长λ1的第一光束和所述第一光盘OD1的保护基板t1进行优化来设计。 另一方面,当第二物镜OBJ2同时用于具有波长λ1的第一光通量和波长λ2的第二光通量时,当第二光盘OD2的保护基板t2和保护基板t3 的第三光盘OD3是相同的,不需要考虑保护性基板的厚度的差异,因此设计容易,并且可以以低成本生产。