JPS5650310A - Projection lens - Google Patents
Projection lensInfo
- Publication number
- JPS5650310A JPS5650310A JP12638779A JP12638779A JPS5650310A JP S5650310 A JPS5650310 A JP S5650310A JP 12638779 A JP12638779 A JP 12638779A JP 12638779 A JP12638779 A JP 12638779A JP S5650310 A JPS5650310 A JP S5650310A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- object side
- convex face
- positive meniscus
- face faced
- 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
PURPOSE: To obtain a light-weight, cheap, and high-contrast projection lens, by constituting the lens system consisting of 5 groups and 5 lenses so that prescribed conditions may be satisfied.
CONSTITUTION: The projection lens has 5-group and 5-lens constitution of the first positive meniscus or flat convex lens L1 with the convex face faced to the object side, the second positive meniscus lens L2 with the convex face faced to the object side, the third negative lens L3 with biconcave faces, the fourth positive lens L4 with the strong convex face faced to the image side and biconvex faces, and the fifth positive meniscus lens L5 with the convex face faced to the object side arranged in order from the object side. When the synthetic focal length of the whole of the system, refractive force of the third lens L3, and the curvature radius of the lens face of the n-th lens from the object side are denoted as (f), K3 and rn respectively, conditions of expression IWIII are satisfied.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12638779A JPS5650310A (en) | 1979-10-02 | 1979-10-02 | Projection lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12638779A JPS5650310A (en) | 1979-10-02 | 1979-10-02 | Projection lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5650310A true JPS5650310A (en) | 1981-05-07 |
Family
ID=14933876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12638779A Pending JPS5650310A (en) | 1979-10-02 | 1979-10-02 | Projection lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5650310A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114296219A (en) * | 2021-12-29 | 2022-04-08 | 歌尔股份有限公司 | Projection lens and projector |
-
1979
- 1979-10-02 JP JP12638779A patent/JPS5650310A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114296219A (en) * | 2021-12-29 | 2022-04-08 | 歌尔股份有限公司 | Projection lens and projector |
CN114296219B (en) * | 2021-12-29 | 2023-09-12 | 歌尔光学科技有限公司 | Projection lens and projector |
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