利索-全球专利检索

  1. Login
  2. Sign Up
Invention Grant
US07187641B2 Objective lens and optical pick-up apparatus 失效
物镜和光学拾取装置

Objective lens and optical pick-up apparatus
Abstract:
An objective lens has a first meniscus-shape lens including a first object-side surface having a positive reflective power; and a second meniscus-shape lens having a positive reflective power. The first meniscus-shape lens and the second meniscus-shape are arranged in that order from an object side. The objective lens satisfies the following formulas: fF/f≦−1.1 LH1H2/f≧0.5 fB/f≧0.2 L/f≦1.3 where f is an object-side focus length of the objective lens, fF is a front focus, fB is a back focus, LH1H2 is a length between an object-side principal point H1 and an image-side principal point H2, and L is a length on an optical axis of the objective lens between the first object-side surface and the second image-side surface.
Abstract(Chinese):

物镜具有包括具有正反射功率的第一物体侧表面的第一弯液面状透镜; 以及具有正反射功率的第二弯液面状透镜。 第一弯月形透镜和第二弯液面形状从物体侧依次排列。 物镜满足下列公式：<？in-line-formula description =“In-line formula”end =“lead”？> fF / f <= - 1.1 <？in-line-formula description =“In-line 公式“end =”tail“？> <？in-line-formula description =”In-line Formulas“end =”lead“？> L H1H2 / f> = 0.5 < -formulae description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line formula”end =“lead”？> fB / f> = 0.2 <？in-line -formulae description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> L / f <= 1.3 <？in-line -formulae description =“In-line Formulas”end =“tail”？>其中f是物镜的物体侧对焦长度，fF是前焦点，fB是后焦点，L H1H2 < SUB>是物体侧主点H 1和图像侧主点H 2之间的长度，L是物镜在第一物体侧表面和第二图像侧之间的光轴上的长度 表面。

Public/Granted literature
Information query
Espacenet
Patent Agency Ranking
0/0