JPS60100717U - Objective lens for optical disk - Google Patents

Objective lens for optical disk

Info

Publication number
JPS60100717U
JPS60100717U JP19342483U JP19342483U JPS60100717U JP S60100717 U JPS60100717 U JP S60100717U JP 19342483 U JP19342483 U JP 19342483U JP 19342483 U JP19342483 U JP 19342483U JP S60100717 U JPS60100717 U JP S60100717U
Authority
JP
Japan
Prior art keywords
lens
value
light source
optical disk
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP19342483U
Other languages
Japanese (ja)
Other versions
JPS636723Y2 (en
Inventor
孝浩 杉山
Original Assignee
旭光学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 旭光学工業株式会社 filed Critical 旭光学工業株式会社
Priority to JP19342483U priority Critical patent/JPS60100717U/en
Publication of JPS60100717U publication Critical patent/JPS60100717U/en
Application granted granted Critical
Publication of JPS636723Y2 publication Critical patent/JPS636723Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lenses (AREA)
  • Optical Head (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案のレンズ構成図、第２図は本考案のコマ
収差及び波面収差図である。FIG. 1 is a diagram of the lens configuration of the present invention, and FIG. 2 is a diagram of coma aberration and wavefront aberration of the present invention.

Claims (1)

【実用新案登録請求の範囲】 ３群３枚構成よりなり、第１群は両凸の正レンズ、第２
群は光源側に凹面を向けた負のメニスカスレンズ、第３
群は光源側に凸面を向けた正のメニスカスレンズで構成
され、光源側より数えて第ｉ番目の曲率半径をｒｌ、第
ｉ番目のレンズ肉厚又は空気間隔をｄ、、第ｊ番目レン
ズめ屈折率をＮＪ　（ここでＮｊは波長７９０ｎｍにお
ける数値である）とするとき、レンズ全系の焦点距離ｆ
＝１．０辷おけるｒｉ、　ｄ、、　ＮＪが以下の数値又
は以下の数値を比例倍した数値の近傍の数値を有した光
デイスク用対物レンズ。 ｒｘ　＝　　２．２５３３　　　ｄｔ　＝　０．２１９
３　　　Ｎｌ　＝　１．７８５０６ｒ２＝　　５’、４
６２５　’　　ｄ２＝　０．０６５８ｒａ　＝１．５７
６５　　　ｄ３＝　０−２８５５　　　Ｎ２　＝　１．
７８５０６ｊ、＝　−３，０３４４ｄ４＝０．１７５４
ｒｓ　”　　０．９１２５　　　ｄｓ　＝　０．４１６
９　　　Ｎ３　＝　１．８８０１０ｒｅ　＝５．１５３
５[Claims for Utility Model Registration] Consisting of three elements in three groups, the first group is a biconvex positive lens, and the second group is a biconvex positive lens.
The third group consists of a negative meniscus lens with a concave surface facing the light source.
The group consists of a positive meniscus lens with a convex surface facing the light source side, where the radius of curvature of the i-th lens counting from the light source side is rl, the thickness or air gap of the i-th lens is d, and the j-th lens diameter is d. When the refractive index is NJ (here, Nj is a value at a wavelength of 790 nm), the focal length of the entire lens system is f
An objective lens for an optical disk in which ri, d, , NJ at =1.0 has a value below or a value in the vicinity of a value obtained by multiplying the value below in proportion. rx = 2.2533 dt = 0.219
3 Nl = 1.78506r2 = 5', 4
625' d2 = 0.0658ra = 1.57
65 d3=0-2855 N2=1.
78506j, = -3,0344d4=0.1754
rs” 0.9125 ds = 0.416
9 N3 = 1.88010re = 5.153
5
JP19342483U 1983-12-15 1983-12-15 Objective lens for optical disk Granted JPS60100717U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19342483U JPS60100717U (en) 1983-12-15 1983-12-15 Objective lens for optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19342483U JPS60100717U (en) 1983-12-15 1983-12-15 Objective lens for optical disk

Publications (2)

Publication Number Publication Date
JPS60100717U true JPS60100717U (en) 1985-07-09
JPS636723Y2 JPS636723Y2 (en) 1988-02-26

Family

ID=30416019

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19342483U Granted JPS60100717U (en) 1983-12-15 1983-12-15 Objective lens for optical disk

Country Status (1)

Country Link
JP (1) JPS60100717U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62191813A (en) * 1986-02-18 1987-08-22 Matsushita Electric Ind Co Ltd Optical head and objective lens for optical disk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62191813A (en) * 1986-02-18 1987-08-22 Matsushita Electric Ind Co Ltd Optical head and objective lens for optical disk

Also Published As

Publication number Publication date
JPS636723Y2 (en) 1988-02-26

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