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    • 2. 发明申请
    • OPTICAL SYSTEM FOR OPTICAL DISC DRIVE
    • 光盘驱动光学系统
    • US20070242590A1
    • 2007-10-18
    • US11735588
    • 2007-04-16
    • Tomokazu KOIZUMIShuichi TAKEUCHI
    • Tomokazu KOIZUMIShuichi TAKEUCHI
    • G11B7/00
    • G11B7/1374G11B7/13922
    • There is provided an optical system for an optical disc drive. The optical system is provided with a light source that emits a light beam, and an objective lens to which the light beam emitted by the light source enters. In this configuration, the light beam emitted by the light source is incident on the objective lens without passing through a coupling lens. Further, the optical system satisfies a condition: −0.70≦d′/(ML′)≦−0.57   (1) where d′ (mm) represents a center thickness of the objective lens corresponding to air, M represents magnification of the optical system, and L′ (mm) represents an object-to-image distance corresponding to air.
    • 提供了一种用于光盘驱动器的光学系统。 光学系统设置有发射光束的光源和由光源发射的光束进入的物镜。 在该结构中,由光源发射的光束不经过耦合透镜入射到物镜上。 此外,光学系统满足条件:<?in-line-formula description =“In-line Formulas”end =“lead”→> 0.70 <= d'/(ML')<= - 0.57(1) ?in-line-formula description =“In-line Formulas”end =“tail”?>其中d'(mm)表示对应于空气的物镜的中心厚度,M表示光学系统的放大率,L' (mm)表示对应于空气的物体到图像的距离。