JPS5511260A - Copying variable power lens system - Google Patents

Copying variable power lens system

Info

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
Application number
JP8487278A
Other languages
Japanese (ja)
Other versions
JPS5850328B2 (en
Inventor
Takayuki Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP8487278A priority Critical patent/JPS5850328B2/en
Publication of JPS5511260A publication Critical patent/JPS5511260A/en
Publication of JPS5850328B2 publication Critical patent/JPS5850328B2/en
Expired legal-status Critical Current

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  • 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
JP8487278A 1978-07-12 1978-07-12 Copying variable magnification lens system Expired JPS5850328B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (7)

* Cited by examiner, † Cited by third party
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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