JPS5511260A - Copying variable power lens system - Google Patents
Copying variable power lens systemInfo
- Publication number
- JPS5511260A JPS5511260A JP8487278A JP8487278A JPS5511260A JP S5511260 A JPS5511260 A JP S5511260A JP 8487278 A JP8487278 A JP 8487278A JP 8487278 A JP8487278 A JP 8487278A JP S5511260 A JPS5511260 A JP S5511260A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens system
- scale
- variable power
- groups
- 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
Landscapes
- Lenses (AREA)
Abstract
PURPOSE: To enhance performances on both scale-down and magnification sides and reduce distortion aberrations by letting the lens system be of asymmetrical type at the time of performing variable power copying by maintaining the subject and film plane constant and moving the lens system.
CONSTITUTION: The lens system is constituted by the 1st, 2nd and 3rd lens groups and the distance between the subject plane and image plane is kept at constant distance by changing the spacings between the 1st and 2nd lenses and between the 2nd and 3rd lenses. The movement of the 2nd lens has variable power functions and the movement of the 1st and 3rd lenses has the function of maintaining the distance between the subject and image plane constant, thus the lens constitution of the entire system is made to asymmetrical type. It is made to the lens system which satisfies formulas [I] thru [V]. In the formulas, fmin denotes the focal length of the entire surface at the scale-down difference, f1 the focal lengths of the 1st group, f1,2min the spacing between the 1st and 2nd lens groups at the scale- down end, D1max the spacing between the 1st and 2nd lens groups at the scale- down end, D2max the similar spacing between the 2nd and 3rd groups and K1(m) thru K3(m) and L1(m) thru L3(m) denote the proportional constants relating to the movement of the respective lens groups at the magnification m.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8487278A JPS5850328B2 (en) | 1978-07-12 | 1978-07-12 | Copying variable magnification lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8487278A JPS5850328B2 (en) | 1978-07-12 | 1978-07-12 | Copying variable magnification lens system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5511260A true JPS5511260A (en) | 1980-01-26 |
JPS5850328B2 JPS5850328B2 (en) | 1983-11-10 |
Family
ID=13842879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8487278A Expired JPS5850328B2 (en) | 1978-07-12 | 1978-07-12 | Copying variable magnification lens system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5850328B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4408841A (en) * | 1980-10-18 | 1983-10-11 | Asahi Kogaku Kogyo Kabushiki Kaisha | Variable power lens system for copying |
JPS61128220A (en) * | 1984-11-28 | 1986-06-16 | Tamuron:Kk | Variable power optical system |
DE3544148A1 (en) * | 1984-12-13 | 1986-06-26 | Asahi Kogaku Kogyo K.K., Tokio/Tokyo | LENS FOR COPYING WITH VARIABLE IMAGE SIZE |
JPS6218514A (en) * | 1985-07-18 | 1987-01-27 | Konishiroku Photo Ind Co Ltd | Transfer zoom lens system |
JPH07218838A (en) * | 1993-12-09 | 1995-08-18 | Asahi Optical Co Ltd | Variable power optical system for copying |
-
1978
- 1978-07-12 JP JP8487278A patent/JPS5850328B2/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4408841A (en) * | 1980-10-18 | 1983-10-11 | Asahi Kogaku Kogyo Kabushiki Kaisha | Variable power lens system for copying |
JPS61128220A (en) * | 1984-11-28 | 1986-06-16 | Tamuron:Kk | Variable power optical system |
DE3544148A1 (en) * | 1984-12-13 | 1986-06-26 | Asahi Kogaku Kogyo K.K., Tokio/Tokyo | LENS FOR COPYING WITH VARIABLE IMAGE SIZE |
DE3544148C2 (en) * | 1984-12-13 | 1991-05-08 | Asahi Kogaku Kogyo K.K., Tokio/Tokyo, Jp | |
JPS6218514A (en) * | 1985-07-18 | 1987-01-27 | Konishiroku Photo Ind Co Ltd | Transfer zoom lens system |
JPH0523404B2 (en) * | 1985-07-18 | 1993-04-02 | Konishiroku Photo Ind | |
JPH07218838A (en) * | 1993-12-09 | 1995-08-18 | Asahi Optical Co Ltd | Variable power optical system for copying |
Also Published As
Publication number | Publication date |
---|---|
JPS5850328B2 (en) | 1983-11-10 |
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