JPS5831512U - Objective lens for magneto-optical disks - Google Patents
Objective lens for magneto-optical disksInfo
- Publication number
- JPS5831512U JPS5831512U JP12422281U JP12422281U JPS5831512U JP S5831512 U JPS5831512 U JP S5831512U JP 12422281 U JP12422281 U JP 12422281U JP 12422281 U JP12422281 U JP 12422281U JP S5831512 U JPS5831512 U JP S5831512U
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- object side
- magneto
- group lens
- optical disks
- 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.)
- Pending
Links
Landscapes
- Lenses (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
第１図は本考案対物レンズの断面図、第２図は変更側対
物レンズの断面図、第３．４図は夫々の実施例の収差曲
線図を示したものである。
１・・・第１群レンズ、２・・・第２群レンズ、３・・
・第３群レンズ、４・・・ｈバーガラス。FIG. 1 is a sectional view of the objective lens of the present invention, FIG. 2 is a sectional view of the modified objective lens, and FIGS. 3.4 are aberration curve diagrams of each embodiment. 1... 1st group lens, 2... 2nd group lens, 3...
・Third group lens, 4...h bar glass.
Claims (1)
た負メニカスの第２群レンズと、物体側に凸面を向けた
正メニスカスの第３群レンズとを配し以下の各条件を満
足する半導体レーザ等の集光用対物レンズ。 （１） ０．２５ ＜ｒ３／ｒ２≦０．３０（２）
０．５５ ＜ｔ５／ｆ＜ ０．９０＜３） １．、
ＯＯ＜ｆ３／ｆ＜１．３５但し、ｒ２＋ ｒ３＋ ｒ５
は夫々物体側から２．３．５番目の面の曲率半径、ｆ３
は第３群レンズの焦点距離、ｆは全系の焦点距離である
。[Claims for Utility Model Registration] From the object side, a biconvex first group lens, a negative meniscus second group lens with a concave surface facing the object side, and a positive meniscus third group lens with a convex surface facing the object side. An objective lens for focusing light on semiconductor lasers, etc. that satisfies each of the following conditions. (1) 0.25 <r3/r2≦0.30 (2)
0.55 <t5/f<0.90<3) 1. ,
OO<f3/f<1.35 However, r2+ r3+ r5
are the radius of curvature of the 2nd, 3rd, and 5th surfaces from the object side, respectively, f3
is the focal length of the third group lens, and f is the focal length of the entire system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12422281U JPS5831512U (en) | 1981-08-24 | 1981-08-24 | Objective lens for magneto-optical disks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12422281U JPS5831512U (en) | 1981-08-24 | 1981-08-24 | Objective lens for magneto-optical disks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5831512U true JPS5831512U (en) | 1983-03-01 |
Family
ID=29918102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12422281U Pending JPS5831512U (en) | 1981-08-24 | 1981-08-24 | Objective lens for magneto-optical disks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5831512U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6064318A (en) * | 1983-09-20 | 1985-04-12 | Konishiroku Photo Ind Co Ltd | Objective lens for recording and reproducing light information |
| JPS62191813A (en) * | 1986-02-18 | 1987-08-22 | Matsushita Electric Ind Co Ltd | Optical head and objective lens for optical disk |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5271253A (en) * | 1975-12-11 | 1977-06-14 | Canon Inc | Compound lens of high resolving power |
| JPS5297750A (en) * | 1976-02-13 | 1977-08-16 | Olympus Optical Co Ltd | Objective lens of medium power |
| JPS5745512A (en) * | 1980-09-02 | 1982-03-15 | Olympus Optical Co Ltd | Lens for video disk |
-
1981
- 1981-08-24 JP JP12422281U patent/JPS5831512U/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5271253A (en) * | 1975-12-11 | 1977-06-14 | Canon Inc | Compound lens of high resolving power |
| JPS5297750A (en) * | 1976-02-13 | 1977-08-16 | Olympus Optical Co Ltd | Objective lens of medium power |
| JPS5745512A (en) * | 1980-09-02 | 1982-03-15 | Olympus Optical Co Ltd | Lens for video disk |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6064318A (en) * | 1983-09-20 | 1985-04-12 | Konishiroku Photo Ind Co Ltd | Objective lens for recording and reproducing light information |
| JPS62191813A (en) * | 1986-02-18 | 1987-08-22 | Matsushita Electric Ind Co Ltd | Optical head and objective lens for optical disk |
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