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发明公开
CN101581824A 物镜、光拾取装置、光记录/再现装置 失效 - 权利终止

物镜、光拾取装置、光记录/再现装置
摘要：
本发明提供一种物镜，该物镜具有充分的工作距离且谋求轻量化。该物镜由至少1个面被设为非球面的单透镜构成，且该物镜将从光源射出的光会聚在进行信息的记录或再现的光记录介质上，并满足下述条件式(1)～(3)：N≤1.75(1)；0.5＜f/f1＜0.6(2)；0.8＜d/(NA·De)＜1.0(3)。此处，N：折射率，f：焦距(mm)，f1：光源侧的面的焦距(mm)，d：光轴上的厚度(mm)，NA：光记录介质侧的数值孔径，De：光源侧的面的有效直径(mm)。
摘要（英）：

An objective lens for converging light emitted from a light source on an optical recording medium to record and reproduce information consists of a single lens having at least one aspheric surface. The following conditional expressions (1) to (3) are satisfied: N <= 1.75 (1); 0.5 < f/f1 < 0.6 (2); 0.8 < d/(NA.De) < 1.0 (3), where N denotes a refractive index, f denotes a focal length (mm), f1 denotes a focal length (mm) of a light source side surface, d denotes a thickness (mm) on an optical axis, NA denotes a numerical aperture on an optical recording medium side, and De denotes an effective aperture (mm) of the light source side surface.

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