JPH1062684A5 - - Google Patents
Info
- Publication number
- JPH1062684A5 JPH1062684A5 JP1996241068A JP24106896A JPH1062684A5 JP H1062684 A5 JPH1062684 A5 JP H1062684A5 JP 1996241068 A JP1996241068 A JP 1996241068A JP 24106896 A JP24106896 A JP 24106896A JP H1062684 A5 JPH1062684 A5 JP H1062684A5
- Authority
- JP
- Japan
- Prior art keywords
- lens
- enlargement side
- focal length
- positive
- surface facing
- 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
Links
Description
【０００６】
（１） ０．３５＜Ｆ１２／Ｆ＜０．６５
（２） −３．０＜Ｆ３／Ｆ＜−０．１３
（３） ０．５＜Ｆ５／Ｆ＜０．８５
（４） ０．３５＜ＢＦ／Ｆ＜０．５５
ここで、 Ｆ１２：第１レンズと第２レンズとの合成焦点距離
Ｆ３：第３レンズの焦点距離
Ｆ５：第５レンズの焦点距離
Ｆ：全レンズ系の焦点距離
ＢＦ：全レンズ系のバックフォーカス
また、前記第４レンズが以下の条件式（５）を満足するように構成されてなることが好ましい。
（５） １．２＜Ｒ８／Ｒ９＜３．２
ここで、 Ｒ８：第４レンズの拡大側の面の曲率半径
Ｒ９：第４レンズの縮小側の面の曲率半径
さらに、前記第１レンズ内もしくは該第１レンズよりも拡大側の位置において、軸上光束をカットするように構成されてなることが好ましい。[0006]
(1) 0.35<F 12 /F<0.65
(2) −3.0<F 3 /F<−0.13
(3) 0.5<F 5 /F<0.85
(4) 0.35<BF/F<0.55
Here, F12 : composite focal length of the first lens and the second lens; F3 : focal length of the third lens; F5 : focal length of the fifth lens; F: focal length of the entire lens system; BF: back focus of the entire lens system. It is also preferable that the fourth lens is configured to satisfy the following conditional expression (5):
(5) 1.2< R8 / R9 <3.2
Here, R8 : radius of curvature of the surface of the enlargement side of the fourth lens, and R9 : radius of curvature of the surface of the reduction side of the fourth lens.Furthermore, it is preferable that the fourth lens is configured to cut the axial light beam at a position within the first lens or on the enlargement side of the first lens.
【０００９】
（１） ０．３５＜Ｆ１２／Ｆ＜０．６５
（２） −３．０＜Ｆ３／Ｆ＜−０．１３
（３） ０．５＜Ｆ５／Ｆ＜０．８５
（４） ０．３５＜ＢＦ／Ｆ＜０．５５
（５） １．２＜Ｒ８／Ｒ９＜３．２
ここで、 Ｆ１２：第１レンズＬ１と第２レンズＬ２との合成焦点距離
Ｆ３：第３レンズＬ３の焦点距離
Ｆ５：第５レンズの焦点距離
Ｆ：全レンズ系の焦点距離
ＢＦ：全レンズ系のバックフォーカス
Ｒ８：第４レンズの拡大側の面の曲率半径
Ｒ９：第４レンズの縮小側の面の曲率半径[0009]
(1) 0.35<F 12 /F<0.65
(2) −3.0<F 3 /F<−0.13
(3) 0.5<F 5 /F<0.85
(4) 0.35<BF/F<0.55
(5) 1.2< R8 / R9 <3.2
where, F12 : composite focal length of the first lens L1 and the second lens L2 ; F3 : focal length of the third lens L3 ; F5 : focal length of the fifth lens; F: focal length of the entire lens system; BF: back focus of the entire lens system; R8 : radius of curvature of the surface of the fourth lens on the enlargement side; R9 : radius of curvature of the surface of the fourth lens on the reduction side.
Claims (3)
（１） ０．３５＜Ｆ１２／Ｆ＜０．６５
（２） −３．０＜Ｆ３／Ｆ＜−０．１３
（３） ０．５＜Ｆ５／Ｆ＜０．８５
（４） ０．３５＜ＢＦ／Ｆ＜０．５５
ここで、 Ｆ１２：第１レンズと第２レンズとの合成焦点距離
Ｆ３：第３レンズの焦点距離
Ｆ５：第５レンズの焦点距離
Ｆ：全レンズ系の焦点距離
ＢＦ：全レンズ系のバックフォーカスA projection lens characterized by comprising, arranged in order from the enlargement side, a positive first lens having a convex surface facing the enlargement side, a positive second lens having a convex surface facing the enlargement side, a third lens consisting of a biconcave lens, a fourth lens consisting of a positive meniscus lens having a convex surface facing the reduction side, and a positive fifth lens having a convex surface facing the enlargement side, and being configured to satisfy the following conditional expressions (1) to (4):
(1) 0.35<F 12 /F<0.65
(2) −3.0<F 3 /F<−0.13
(3) 0.5<F 5 /F<0.85
(4) 0.35<BF/F<0.55
where F 12 is the combined focal length of the first and second lenses, F 3 is the focal length of the third lens, F 5 is the focal length of the fifth lens, F is the focal length of the entire lens system, and BF is the back focus of the entire lens system.
（５） １．２＜Ｒ８／Ｒ９＜３．２
ここで、 Ｒ８：第４レンズの拡大側の面の曲率半径
Ｒ９：第４レンズの縮小側の面の曲率半径2. The projection lens according to claim 1, wherein the fourth lens is configured to satisfy the following conditional expression (5):
(5) 1.2< R8 / R9 <3.2
where R8 is the radius of curvature of the surface of the fourth lens on the enlargement side, and R9 is the radius of curvature of the surface of the fourth lens on the reduction side.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24106896A JP3741790B2 (en) | 1996-08-22 | 1996-08-22 | Projection lens |
| DE1997136623 DE19736623A1 (en) | 1996-08-22 | 1997-08-22 | Projection objective lens for television projection system |
| US09/280,080 US6295166B1 (en) | 1996-08-22 | 1999-03-29 | Projection lens for projection type of television system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24106896A JP3741790B2 (en) | 1996-08-22 | 1996-08-22 | Projection lens |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPH1062684A JPH1062684A (en) | 1998-03-06 |
| JPH1062684A5 true JPH1062684A5 (en) | 2004-08-26 |
| JP3741790B2 JP3741790B2 (en) | 2006-02-01 |
Family
ID=17068827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24106896A Expired - Lifetime JP3741790B2 (en) | 1996-08-22 | 1996-08-22 | Projection lens |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3741790B2 (en) |
| DE (1) | DE19736623A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4240340B2 (en) * | 1998-08-24 | 2009-03-18 | フジノン株式会社 | Projection lens |
| ES2306599B1 (en) * | 2007-04-24 | 2009-09-03 | Joan Aguado Moreno | DIGITAL COPIER OF SLIDES. |
| WO2008129109A1 (en) * | 2007-04-24 | 2008-10-30 | Joan Aguado Moreno | Digital copier |
| KR101053288B1 (en) | 2009-12-22 | 2011-08-01 | 삼성전기주식회사 | Imaging optics |
| CN115201997B (en) * | 2021-04-08 | 2024-07-12 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN116009192B (en) * | 2021-10-21 | 2025-11-25 | 成都理想境界科技有限公司 | Optical imaging lens assembly, scanning display device and near-eye display device |
| JP7553617B2 (en) * | 2023-01-20 | 2024-09-18 | 維沃移動通信有限公司 | Imaging lens module, imaging device, and electronic device |
-
1996
- 1996-08-22 JP JP24106896A patent/JP3741790B2/en not_active Expired - Lifetime
-
1997
- 1997-08-22 DE DE1997136623 patent/DE19736623A1/en not_active Ceased
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