首页> 外国专利> LENS AND AN OPTICAL SYSTEM USING THE LENS, AN OPTICAL HEAD AND AN OPTICAL DISC APPARATUS USING THE OPTICAL HEAD, PARTICULARLY CONCERNED WITH FOCUSING AN OPTICAL BEAM ON A DATA RECORDING SURFACE WITH HIGH OPTICAL USE EFFICIENCY IN A STATE THAT WAVEFRONT ABERRATION IS REDUCED WITH RESPECT TO EACH OF DIFFERENT KIND OF OPTICAL RECORDING MEDIA

LENS AND AN OPTICAL SYSTEM USING THE LENS, AN OPTICAL HEAD AND AN OPTICAL DISC APPARATUS USING THE OPTICAL HEAD, PARTICULARLY CONCERNED WITH FOCUSING AN OPTICAL BEAM ON A DATA RECORDING SURFACE WITH HIGH OPTICAL USE EFFICIENCY IN A STATE THAT WAVEFRONT ABERRATION IS REDUCED WITH RESPECT TO EACH OF DIFFERENT KIND OF OPTICAL RECORDING MEDIA

机译：镜头和使用镜头的光学系统，使用光学头的光学头和光盘装置，尤其是在数据记录表面上聚焦光学光束，该状态的光学使用效率很高，因此需要像差的状态不同种类的光学记录媒体

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摘要

PURPOSE: A lens, and an optical system, an optical head and an optical disc apparatus are provided to be used in a compatible recording and reproducing apparatus which can record or reproduce data on various kinds of discs such as a CD(Compact Disc), a DVD(Digital Versatile Disc) and a BD(Blu-ray Disc). CONSTITUTION: A lens focuses homogeneous lights of various kinds of wavelengths through a refraction action. An area on at least one lens surface, commonly used in all the homogeneous lights, is divided on plural non-spherical parts which have different refractive indexes. An equality of Max(Aij)/Min(Aij) 3 is satisfied with respect to each wavelength, wherein Aij is Bij-mij, Bij is Dj*(ni-1)/lamda i -C, lamda i is a wavelength, Dj is a step height value in parallel with a lens beam axis, ni is a refractive index of a lens for a wavelength, mij is an integer nearest to Bij, and C is a compensation term.

机译：目的：提供一种透镜，光学系统，光学头和光盘装置，以用于兼容的记录和再现装置中，该装置可以在诸如CD（Compact Disc）的各种光盘上记录或再现数据， DVD（数字多功能光盘）和BD（蓝光光盘）。组成：透镜通过折射作用聚焦各种波长的均匀光。在所有均匀光中通常使用的至少一个透镜表面上的区域被划分为具有不同折射率的多个非球形部分。对于每个波长，满足Max（Aij）/ Min（Aij）<3的等式，其中Aij是Bij-mij，Bij是Dj *（ni-1）/λi -C，λi是波长， Dj是与透镜光束轴平行的台阶高度值，ni是透镜在波长上的折射率，mij是最接近Bij的整数，C是补偿项。

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公开/公告号KR20050007182A

专利类型
公开/公告日2005-01-17

原文格式PDF
申请/专利权人 HITACHI MAXELL LTD.;
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申请/专利号KR20040053381
发明设计人 SUGI YASUYUKI;
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申请日2004-07-09
分类号G11B7/135;
国家 KR
入库时间 2022-08-21 22:06:00

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