JPS5444554A - Variable power lens system - Google Patents

Variable power lens system

Info

Publication number
JPS5444554A
JPS5444554A JP11102877A JP11102877A JPS5444554A JP S5444554 A JPS5444554 A JP S5444554A JP 11102877 A JP11102877 A JP 11102877A JP 11102877 A JP11102877 A JP 11102877A JP S5444554 A JPS5444554 A JP S5444554A
Authority
JP
Japan
Prior art keywords
variable power
power lens
focal length
conjugate distance
lens group
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
Application number
JP11102877A
Other languages
Japanese (ja)
Inventor
Shuji Ogino
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP11102877A priority Critical patent/JPS5444554A/en
Publication of JPS5444554A publication Critical patent/JPS5444554A/en
Pending legal-status Critical Current

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  • Lenses (AREA)

Abstract

PURPOSE: To obtain two kinds of desired image-forming magnifications while the conjugate distance of the entire system is held constant by satisfying specified fomulas with the focal length of the stationary correction lens constituting the system and the movement of the movable variable power lens group.
CONSTITUTION: The lens system is constituted by a stationary correction lens groupIwhich has a positive or negative focal length fc and a variable power lens group II which has a positive focal length fv and is movable in the optical axis direction. The conjugate distance of the entire system is made coconstant at the specific two points in its movementtn, and arrangement is so formed the lins system satisfies the conditions of d=fv{(m1/m2)1/2-(m2/m1)1/2}and fc]=[{1+(m2/ m1)1/2}fv-e]/(m2/m1)1/2-1, where m1, m2: desired image forming magnifications where |m1|>|m2|, e: the spacing between the thin walls of both lens groups when magnification is m1, d: the movement of the variable power lens group. Thereby, the image-forming magnification may be changed to a desired one merely be moving one group along with the conjugate distance being held constant.
COPYRIGHT: (C)1979,JPO&Japio
JP11102877A 1977-09-14 1977-09-14 Variable power lens system Pending JPS5444554A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11102877A JPS5444554A (en) 1977-09-14 1977-09-14 Variable power lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11102877A JPS5444554A (en) 1977-09-14 1977-09-14 Variable power lens system

Publications (1)

Publication Number Publication Date
JPS5444554A true JPS5444554A (en) 1979-04-09

Family

ID=14550556

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11102877A Pending JPS5444554A (en) 1977-09-14 1977-09-14 Variable power lens system

Country Status (1)

Country Link
JP (1) JPS5444554A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3022732A1 (en) * 1979-06-20 1981-01-15 Asahi Optical Co Ltd ZOOM LENS FOR A COPYING SYSTEM
JPS58184917A (en) * 1982-04-23 1983-10-28 Konishiroku Photo Ind Co Ltd Small-sized zoom lens
US4585314A (en) * 1983-04-28 1986-04-29 Canon Kabushiki Kaisha Projection lens
US9726858B2 (en) 2014-12-30 2017-08-08 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50131523A (en) * 1974-04-04 1975-10-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50131523A (en) * 1974-04-04 1975-10-17

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3022732A1 (en) * 1979-06-20 1981-01-15 Asahi Optical Co Ltd ZOOM LENS FOR A COPYING SYSTEM
DE3022732C2 (en) * 1979-06-20 1982-07-01 Asahi Kogaku Kogyo K.K., Tokyo Varifocal lens for copying purposes
JPS58184917A (en) * 1982-04-23 1983-10-28 Konishiroku Photo Ind Co Ltd Small-sized zoom lens
JPH0444245B2 (en) * 1982-04-23 1992-07-21 Konishiroku Photo Ind
US4585314A (en) * 1983-04-28 1986-04-29 Canon Kabushiki Kaisha Projection lens
US9726858B2 (en) 2014-12-30 2017-08-08 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US10371927B2 (en) 2014-12-30 2019-08-06 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US11262542B2 (en) 2014-12-30 2022-03-01 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device
US11867884B2 (en) 2014-12-30 2024-01-09 Largan Precision Co., Ltd. Photographing optical lens assembly, image capturing device and electronic device

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