JPS5472066A - Divergent refracting power group preceding type two- compoment zoom lens system - Google Patents

Divergent refracting power group preceding type two- compoment zoom lens system

Info

Publication number
JPS5472066A
JPS5472066A JP13907377A JP13907377A JPS5472066A JP S5472066 A JPS5472066 A JP S5472066A JP 13907377 A JP13907377 A JP 13907377A JP 13907377 A JP13907377 A JP 13907377A JP S5472066 A JPS5472066 A JP S5472066A
Authority
JP
Japan
Prior art keywords
equation
lens system
refracting power
zoom ratio
corrections
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
JP13907377A
Other languages
Japanese (ja)
Other versions
JPS6140966B2 (en
Inventor
Mitsuaki Horimoto
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 JP13907377A priority Critical patent/JPS5472066A/en
Publication of JPS5472066A publication Critical patent/JPS5472066A/en
Publication of JPS6140966B2 publication Critical patent/JPS6140966B2/ja
Granted legal-status Critical Current

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  • Lenses (AREA)

Abstract

PURPOSE: To compose a compact two-component zoom lens system of divergent refracting power group preceding type of relatively high zoom ratio having excellent aberration performance, by overcoming problems such as aberration corrections by setting various conditions shown in equation I.
CONSTITUTION: The stronger the divergency of front group refracting power ϕ1, the larger the zoom ratio Zr can be made, so that the effective diameter of front group 1 may be smaller. This, however, causes limits on the aberration corrections, thereby limiting also the divergency of ϕ1. Therefore, when expanding the zoom ratio to the value of equation I-1, the ratio of refracting powers ϕ1 and ϕ2 of front group I and rear group II is set to the value of equation I-2. Meanwhile, the distance L from the image plane to the front group becomes the minimum when the interval l between the front and rear groups is l=(2ϕ1+ϕ2)/(ϕ1+ϕ2), so that equation I-3 is established. If the upper limit of equation I-4 is exceeded, it is improper from the view point of aberration corrections, and if beneath the lower limit, corrections of strains may be possible. Thus, a compact lens system of high zoom ratio having excellent aberration performance may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP13907377A 1977-11-18 1977-11-18 Divergent refracting power group preceding type two- compoment zoom lens system Granted JPS5472066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13907377A JPS5472066A (en) 1977-11-18 1977-11-18 Divergent refracting power group preceding type two- compoment zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13907377A JPS5472066A (en) 1977-11-18 1977-11-18 Divergent refracting power group preceding type two- compoment zoom lens system

Publications (2)

Publication Number Publication Date
JPS5472066A true JPS5472066A (en) 1979-06-09
JPS6140966B2 JPS6140966B2 (en) 1986-09-12

Family

ID=15236850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13907377A Granted JPS5472066A (en) 1977-11-18 1977-11-18 Divergent refracting power group preceding type two- compoment zoom lens system

Country Status (1)

Country Link
JP (1) JPS5472066A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719708A (en) * 1980-07-10 1982-02-02 Konishiroku Photo Ind Co Ltd Zoom lens
US5434710A (en) * 1991-12-24 1995-07-18 Olympus Optical Co., Ltd. Zoom lens system comprising three lens units
US5644435A (en) * 1995-01-19 1997-07-01 Mitsubishi Denki Kabushiki Kaisha Zoom lens system and projection-type display apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5183543A (en) * 1975-01-18 1976-07-22 Asahi Optical Co Ltd
JPS51144653A (en) * 1975-06-06 1976-12-11 Canon Inc Zoom lens system
JPS5220018A (en) * 1975-08-07 1977-02-15 Canon Inc Wide angle zoom lens system
JPS52134452A (en) * 1976-05-06 1977-11-10 Nippon Chemical Ind Wide angle zoom lens system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5183543A (en) * 1975-01-18 1976-07-22 Asahi Optical Co Ltd
JPS51144653A (en) * 1975-06-06 1976-12-11 Canon Inc Zoom lens system
JPS5220018A (en) * 1975-08-07 1977-02-15 Canon Inc Wide angle zoom lens system
JPS52134452A (en) * 1976-05-06 1977-11-10 Nippon Chemical Ind Wide angle zoom lens system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719708A (en) * 1980-07-10 1982-02-02 Konishiroku Photo Ind Co Ltd Zoom lens
US5434710A (en) * 1991-12-24 1995-07-18 Olympus Optical Co., Ltd. Zoom lens system comprising three lens units
US5644435A (en) * 1995-01-19 1997-07-01 Mitsubishi Denki Kabushiki Kaisha Zoom lens system and projection-type display apparatus

Also Published As

Publication number Publication date
JPS6140966B2 (en) 1986-09-12

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