DE3123744C2 - - Google Patents

Info

Publication number
DE3123744C2
DE3123744C2 DE3123744A DE3123744A DE3123744C2 DE 3123744 C2 DE3123744 C2 DE 3123744C2 DE 3123744 A DE3123744 A DE 3123744A DE 3123744 A DE3123744 A DE 3123744A DE 3123744 C2 DE3123744 C2 DE 3123744C2
Authority
DE
Germany
Prior art keywords
lens group
focusing
focusing lens
focal length
variator
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
DE3123744A
Other languages
German (de)
English (en)
Other versions
DE3123744A1 (de
Inventor
Keiji Yokohama Kanagawa Jp Ikemori
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 DE3123744A1 publication Critical patent/DE3123744A1/de
Application granted granted Critical
Publication of DE3123744C2 publication Critical patent/DE3123744C2/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
    • G02B15/22—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 with movable lens means specially adapted for focusing at close 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
    • G02B15/143—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 three groups only
    • G02B15/1431—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 three groups only the first group being positive
    • G02B15/143105—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 three groups only the first group being positive arranged +-+
    • 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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144109—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 four groups only the first group being positive arranged +--+
    • 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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144113—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 four groups only the first group being positive arranged +-++
    • 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
    • G02B15/144—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 four groups only
    • G02B15/1445—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 four groups only the first group being negative
    • G02B15/144511—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 four groups only the first group being negative arranged -+-+
    • 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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
  • Diaphragms For Cameras (AREA)
DE19813123744 1980-06-19 1981-06-15 "zoomobjektiv" Granted DE3123744A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8306580A JPS578515A (en) 1980-06-19 1980-06-19 Zoom lens

Publications (2)

Publication Number Publication Date
DE3123744A1 DE3123744A1 (de) 1982-03-18
DE3123744C2 true DE3123744C2 (en, 2012) 1988-08-04

Family

ID=13791773

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19813123744 Granted DE3123744A1 (de) 1980-06-19 1981-06-15 "zoomobjektiv"

Country Status (3)

Country Link
US (1) US4432615A (en, 2012)
JP (1) JPS578515A (en, 2012)
DE (1) DE3123744A1 (en, 2012)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5898719A (ja) * 1981-12-08 1983-06-11 Olympus Optical Co Ltd ズ−レンズ
US4861147A (en) * 1982-08-17 1989-08-29 Canon Kabushiki Kaisha Zoom lens system
JPS6011812A (ja) * 1983-06-30 1985-01-22 Asahi Optical Co Ltd バツクフオ−カスの長いズ−ムレンズ
US4705363A (en) * 1983-11-29 1987-11-10 Canon Kabushiki Kaisha Aberrational deterioration prevented zoom lens
JPS6122278A (ja) * 1984-07-11 1986-01-30 Matsushita Electric Ind Co Ltd 車種判別装置
JPS61138912A (ja) * 1984-12-11 1986-06-26 Asahi Optical Co Ltd 望遠マクロレンズのフオ−カシイング方式
US4894682A (en) * 1986-09-30 1990-01-16 Canon Kabushiki Kaisha Variable magnification copying apparatus
DD261851B5 (de) * 1987-07-02 1993-10-28 Docter Optic Eisfeld Gmbh Okular mit variabler brennweite
JPS6440808A (en) * 1987-08-05 1989-02-13 Canon Kk Zoom lens
JPH0347354A (ja) * 1989-07-14 1991-02-28 Tokyu Constr Co Ltd コンクリートスラブに於けるプレストレス構法および梁貫通ケーブル用スリーブ
JP2816735B2 (ja) * 1990-02-15 1998-10-27 旭光学工業株式会社 ズームレンズの絞り機構
JP3309998B2 (ja) * 1991-10-09 2002-07-29 株式会社リコー コンパクトなズームレンズ
US5592335A (en) * 1993-03-23 1997-01-07 Nikon Corporation Reduced diameter camera lens barrel with lens shift device and improved focus lens drive linkage
JP3586315B2 (ja) * 1995-06-30 2004-11-10 ペンタックス株式会社 レンズ鏡筒
JPH09197277A (ja) * 1996-01-23 1997-07-31 Minolta Co Ltd ズームレンズ
US8314985B2 (en) 2008-10-28 2012-11-20 Boise State University Surface plasmon optical modulator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL90813C (en, 2012) * 1950-07-18
US3094581A (en) * 1960-12-29 1963-06-18 Frank G Back Zoom projection lens
US3353891A (en) * 1964-06-18 1967-11-21 Bausch & Lomb Zoom lens system having front mounted axially movable aperture stop to control numerical aperture during magnification change
JPS5141354B2 (en, 2012) * 1973-02-24 1976-11-09
US4159865A (en) * 1975-08-22 1979-07-03 Canon Kabushiki Kaisha Zoom lens system

Also Published As

Publication number Publication date
US4432615A (en) 1984-02-21
JPS578515A (en) 1982-01-16
JPS6119010B2 (en, 2012) 1986-05-15
DE3123744A1 (de) 1982-03-18

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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