JPS57161824A - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number
JPS57161824A
JPS57161824A JP56046212A JP4621281A JPS57161824A JP S57161824 A JPS57161824 A JP S57161824A JP 56046212 A JP56046212 A JP 56046212A JP 4621281 A JP4621281 A JP 4621281A JP S57161824 A JPS57161824 A JP S57161824A
Authority
JP
Japan
Prior art keywords
group
groups
lens
zoom
positive lens
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
JP56046212A
Other languages
Japanese (ja)
Inventor
Kinji Takabayashi
Masakuni Tai
Tomonori Abe
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.)
TOKINAA KOGAKU KK
Tokina Optical Co Ltd
Original Assignee
TOKINAA KOGAKU KK
Tokina Optical 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 TOKINAA KOGAKU KK, Tokina Optical Co Ltd filed Critical TOKINAA KOGAKU KK
Priority to JP56046212A priority Critical patent/JPS57161824A/en
Publication of JPS57161824A publication Critical patent/JPS57161824A/en
Pending 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
    • G02B15/16—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
    • 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
    • G02B15/144105—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 +-+-

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To obtain a small-sized, lightweight lens system which has a >=5 zoom ratio, by using four lens groups, moving the 1st and 4th groups linearly, and compensating an image plane by the curved-line movement of the 3rd group. CONSTITUTION:On the principle that the 1st and 3rd lens group are an afocal system at some zoom position, this zoom lens system forms a focal system. The system consists of the 1st positive lens groups, the 2nd negative lens groups, the 3rd positive lens group, and the 4th positive lens group from an objecct side, and for zooming from a wide side to a telephoto side, the 1st and 4th groups are moved linearly to increase a telephoto ratio, correcting aberration variation. Then, the 2nd group is fixed and only the 3rd group is moved curvedly to compensate focus movement. For the purpose, the focal lengths of the 2nd and 4th, and the focal length of the whole system are specified as shown by inequalitiesI-III.
JP56046212A 1981-03-31 1981-03-31 Zoom lens system Pending JPS57161824A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56046212A JPS57161824A (en) 1981-03-31 1981-03-31 Zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56046212A JPS57161824A (en) 1981-03-31 1981-03-31 Zoom lens system

Publications (1)

Publication Number Publication Date
JPS57161824A true JPS57161824A (en) 1982-10-05

Family

ID=12740784

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56046212A Pending JPS57161824A (en) 1981-03-31 1981-03-31 Zoom lens system

Country Status (1)

Country Link
JP (1) JPS57161824A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59200208A (en) * 1983-04-28 1984-11-13 Olympus Optical Co Ltd Zoom lens
JPS59201014A (en) * 1983-04-28 1984-11-14 Nitto Kogaku Kk Zoom lens
US4576445A (en) * 1983-05-27 1986-03-18 Nippon Kogaku K. K. Zoom lens
JPS6273222A (en) * 1985-09-26 1987-04-03 Asahi Optical Co Ltd High variable power zoom lens for finite distance
JPS62115411A (en) * 1985-11-15 1987-05-27 Olympus Optical Co Ltd Zoom lens
US4695133A (en) * 1984-04-02 1987-09-22 Canon Kabushiki Kaisha High range zoom lens
US4789226A (en) * 1983-07-22 1988-12-06 Olympus Optical Co., Ltd. Zoom lens system
US4917482A (en) * 1987-12-29 1990-04-17 Asahi Kogaku Kogyo Kabushiki Kaisha Compact zoom lens system capable of high zoom ratio and having coverage of a wide visual field
US5734508A (en) * 1994-09-26 1998-03-31 Nikon Corporation High-magnification wide-angle zoom lens

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59200208A (en) * 1983-04-28 1984-11-13 Olympus Optical Co Ltd Zoom lens
JPS59201014A (en) * 1983-04-28 1984-11-14 Nitto Kogaku Kk Zoom lens
JPH0313566B2 (en) * 1983-04-28 1991-02-22 Nitto Optical
JPH0522884B2 (en) * 1983-04-28 1993-03-31 Olympus Optical Co
US4576445A (en) * 1983-05-27 1986-03-18 Nippon Kogaku K. K. Zoom lens
US4789226A (en) * 1983-07-22 1988-12-06 Olympus Optical Co., Ltd. Zoom lens system
US4695133A (en) * 1984-04-02 1987-09-22 Canon Kabushiki Kaisha High range zoom lens
JPS6273222A (en) * 1985-09-26 1987-04-03 Asahi Optical Co Ltd High variable power zoom lens for finite distance
JPS62115411A (en) * 1985-11-15 1987-05-27 Olympus Optical Co Ltd Zoom lens
US4917482A (en) * 1987-12-29 1990-04-17 Asahi Kogaku Kogyo Kabushiki Kaisha Compact zoom lens system capable of high zoom ratio and having coverage of a wide visual field
US5734508A (en) * 1994-09-26 1998-03-31 Nikon Corporation High-magnification wide-angle zoom lens

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