DE3140841C2 - - Google Patents

Info

Publication number
DE3140841C2
DE3140841C2 DE3140841A DE3140841A DE3140841C2 DE 3140841 C2 DE3140841 C2 DE 3140841C2 DE 3140841 A DE3140841 A DE 3140841A DE 3140841 A DE3140841 A DE 3140841A DE 3140841 C2 DE3140841 C2 DE 3140841C2
Authority
DE
Germany
Prior art keywords
lens
lens group
negative
magnification
positive
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.)
Expired - Lifetime
Application number
DE3140841A
Other languages
German (de)
English (en)
Other versions
DE3140841A1 (de
Inventor
Mitsuhiro Chigasaki Kanagawa Jp Tokuhara
Yu Kokubunji Tokio/Tokyo Jp Yamada
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Publication of DE3140841A1 publication Critical patent/DE3140841A1/de
Application granted granted Critical
Publication of DE3140841C2 publication Critical patent/DE3140841C2/de
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
DE19813140841 1980-10-15 1981-10-14 Optisches system mit variabler vergroesserung Granted DE3140841A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55144804A JPS5767909A (en) 1980-10-15 1980-10-15 Variable magnification optical system

Publications (2)

Publication Number Publication Date
DE3140841A1 DE3140841A1 (de) 1982-05-27
DE3140841C2 true DE3140841C2 (e) 1991-09-05

Family

ID=15370845

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19813140841 Granted DE3140841A1 (de) 1980-10-15 1981-10-14 Optisches system mit variabler vergroesserung

Country Status (4)

Country Link
US (1) US4560242A (e)
JP (1) JPS5767909A (e)
DE (1) DE3140841A1 (e)
GB (1) GB2088081B (e)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964810A (ja) * 1982-10-05 1984-04-12 Canon Inc 変倍投影装置
JPH0629900B2 (ja) * 1983-12-06 1994-04-20 株式会社トプコン 変 倍 光 学 系
JPS61128220A (ja) * 1984-11-28 1986-06-16 Tamuron:Kk 変倍光学系
JPS61140912A (ja) * 1984-12-13 1986-06-28 Asahi Optical Co Ltd 複写変倍レンズ系
JPS6218514A (ja) * 1985-07-18 1987-01-27 Konishiroku Photo Ind Co Ltd 複写用ズ−ムレンズ系
JPH077145B2 (ja) * 1985-11-22 1995-01-30 ミノルタ株式会社 有限共役距離における変倍光学系
US4981344A (en) * 1988-11-14 1991-01-01 Minolta Camera Kabushiki Kaisha Wide angle lens system for use in copying machine
JP2811751B2 (ja) * 1989-06-06 1998-10-15 ミノルタ株式会社 対称型広角レンズ系
JP2979844B2 (ja) * 1992-05-01 1999-11-15 キヤノン株式会社 調整機構を有した撮像装置
DE4433532C1 (de) * 1994-09-20 1996-04-11 Agfa Gevaert Ag Vorrichtung für ein fotografisches Kopiergerät und fotografisches Kopiergerät

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713849B1 (e) * 1969-09-08 1982-03-19
DE1951148B2 (de) * 1969-10-10 1973-10-31 Optische Werke G. Rodenstock, 8000 Muenchen Achthnsiges apochromatisches Objektiv
US3687522A (en) * 1971-02-01 1972-08-29 Ilex Optical Co Inc Variable magnification lens system for finite conjugate distances
JPS5715367B2 (e) * 1971-10-22 1982-03-30
US4037937A (en) * 1971-10-22 1977-07-26 Canon Kabushiki Kaisha Variable magnification lens system using symmetric lens of variable focal length
US3731990A (en) * 1971-10-28 1973-05-08 Bausch & Lomb Symmetrical copy lenses
GB1386175A (en) * 1972-06-02 1975-03-05 Rank Organisation Ltd Lenses
US4056308A (en) * 1976-03-03 1977-11-01 Xerox Corporation Variable focal length reflector lens system
US4061419A (en) * 1976-03-03 1977-12-06 Xerox Corporation Variable magnification lens system
JPS589401B2 (ja) * 1976-11-12 1983-02-21 富士写真光機株式会社 有限共「やく」距離におけるズ−ムレンズ
US4149774A (en) * 1977-11-14 1979-04-17 Fuji Photo Optical Co., Ltd. Zoom lens system

Also Published As

Publication number Publication date
GB2088081A (en) 1982-06-03
US4560242A (en) 1985-12-24
GB2088081B (en) 1984-07-18
JPS5767909A (en) 1982-04-24
DE3140841A1 (de) 1982-05-27

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
D2 Grant after examination
8364 No opposition during term of opposition