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US07782735B2 Optical pickup device capable of handling a plurality of laser light beams having different wavelengths 失效
能够处理具有不同波长的多个激光束的光拾取装置

Optical pickup device capable of handling a plurality of laser light beams having different wavelengths
Abstract:
An optical pickup device that emits laser light beams having different wavelengths to a recording medium is disclosed. A semiconductor laser includes three laser elements having emitting wavelengths of λ1, λ2, and λ3 (λ1
Abstract(Chinese):

公开了向记录介质发射具有不同波长的激光束的光学拾取装置。 半导体激光器包括分别具有λ1，λ2和λ3（λ1<λ2<λ3）的发射波长的三个激光元件。 多个衍射光栅基本上通过衍射作用使从激光元件发射的激光束的光轴彼此对准。 对于波长为λ2和λ3的相应激光束分别提供衍射光栅。 将波长为λ2，λ3的各激光的±n次衍射光（n为1以上的整数）与波长为λ1的激光的光轴对准的衍射动作 被提供用于波长为λ2和λ3的激光束。

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