CA1018807A - Variable magnification lens system - Google Patents

Variable magnification lens system

Info

Publication number
CA1018807A
CA1018807A CA208,265A CA208265A CA1018807A CA 1018807 A CA1018807 A CA 1018807A CA 208265 A CA208265 A CA 208265A CA 1018807 A CA1018807 A CA 1018807A
Authority
CA
Canada
Prior art keywords
lens system
variable magnification
magnification lens
variable
magnification
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
Application number
CA208,265A
Other languages
English (en)
Other versions
CA208265S (en
Inventor
Roscoe J. Donnel
George L. Mccrobie
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Application granted granted Critical
Publication of CA1018807A publication Critical patent/CA1018807A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
    • 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
    • G02B15/146—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 more than five groups
    • G02B15/1461—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 more than five groups 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)
  • Exposure Or Original Feeding In Electrophotography (AREA)
CA208,265A 1973-09-04 1974-08-30 Variable magnification lens system Expired CA1018807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US393844A US3865470A (en) 1973-09-04 1973-09-04 Variable magnification lens system

Publications (1)

Publication Number Publication Date
CA1018807A true CA1018807A (en) 1977-10-11

Family

ID=23556470

Family Applications (1)

Application Number Title Priority Date Filing Date
CA208,265A Expired CA1018807A (en) 1973-09-04 1974-08-30 Variable magnification lens system

Country Status (13)

Country Link
US (1) US3865470A (fr)
JP (1) JPS5056242A (fr)
BE (1) BE819497A (fr)
BR (1) BR7405353A (fr)
CA (1) CA1018807A (fr)
DE (1) DE2441294C2 (fr)
ES (1) ES429431A1 (fr)
FR (1) FR2242694B1 (fr)
GB (1) GB1469585A (fr)
IT (1) IT1020382B (fr)
NL (1) NL7410422A (fr)
SE (1) SE392528B (fr)
SU (1) SU592375A3 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912374A (en) * 1974-10-17 1975-10-14 Xerox Corp Six component zoom lens
US4149774A (en) * 1977-11-14 1979-04-17 Fuji Photo Optical Co., Ltd. Zoom lens system
JPS5590930A (en) * 1978-12-29 1980-07-10 Nippon Kogaku Kk <Nikon> 4-group constitution lens
JPS5768810A (en) * 1980-10-18 1982-04-27 Asahi Optical Co Ltd Variable nagnification lens system for copying
US4753522A (en) * 1985-06-03 1988-06-28 Ricoh Company, Ltd. Plastic lens assembly for use in copying machines
JPS6291913A (ja) * 1985-10-18 1987-04-27 興和株式会社 レ−ザ−スポツト光学系
US4812021A (en) * 1987-10-07 1989-03-14 Xerox Corporation Wide angle zoom lens
JP2562636B2 (ja) * 1987-12-25 1996-12-11 富士写真光機株式会社 複写用変倍レンズ系

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713849B1 (fr) * 1969-09-08 1982-03-19
US3687522A (en) * 1971-02-01 1972-08-29 Ilex Optical Co Inc Variable magnification lens system for finite conjugate distances

Also Published As

Publication number Publication date
BR7405353A (pt) 1976-02-24
SE7410077L (fr) 1975-03-05
SE392528B (sv) 1977-03-28
FR2242694B1 (fr) 1976-10-22
SU592375A3 (ru) 1978-02-05
JPS5056242A (fr) 1975-05-16
DE2441294C2 (de) 1982-04-01
GB1469585A (en) 1977-04-06
IT1020382B (it) 1977-12-20
ES429431A1 (es) 1977-01-16
NL7410422A (fr) 1974-10-25
US3865470A (en) 1975-02-11
DE2441294A1 (de) 1975-03-13
AU7280274A (en) 1976-03-04
BE819497A (fr) 1974-12-31
FR2242694A1 (fr) 1975-03-28

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