JPS5778513A - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number
JPS5778513A
JPS5778513A JP55154050A JP15405080A JPS5778513A JP S5778513 A JPS5778513 A JP S5778513A JP 55154050 A JP55154050 A JP 55154050A JP 15405080 A JP15405080 A JP 15405080A JP S5778513 A JPS5778513 A JP S5778513A
Authority
JP
Japan
Prior art keywords
group
fixed
diaphragm
lens group
reduction
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
JP55154050A
Other languages
Japanese (ja)
Other versions
JPH0125043B2 (en
Inventor
Hisayuki Masumoto
Masaichi Shimomura
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 JP55154050A priority Critical patent/JPS5778513A/en
Priority to US06/318,144 priority patent/US4492437A/en
Publication of JPS5778513A publication Critical patent/JPS5778513A/en
Publication of JPH0125043B2 publication Critical patent/JPH0125043B2/ja
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
    • G02B15/16—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
    • G02B15/163—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 having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—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 having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • 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

Landscapes

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

Abstract

PURPOSE:To realize the infocus state to an approximate object, by shifting the lens group at the back of the diaphragm of a fixed rear group in a magnification and reduction system comprising a fixed front group, a magnification and reduction lens group including a variator and a compensator and the above-mentioned fixed rear group respectively. CONSTITUTION:A zoom lens system comprises a fixed front groupI, a variation and reduction lens group II including a variator and a compensator and a rear group III which is totally fixed and contains a diaphragm S at its front or inside part in that order from the side of an object. A mobile lens group F having the positive refractive power is provided at the side of an image from the diaphragm in the group III, and this group F is shifted toward the object to perform the focusing to an approximate object. The ratio between the focal distance fF of the group F and the focal distance of the group III is set at 0.2-2, and as a result a well- balanced compensation is possible to the aberration fluctuation caused by the focusing.
JP55154050A 1980-11-04 1980-11-04 Zoom lens system Granted JPS5778513A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55154050A JPS5778513A (en) 1980-11-04 1980-11-04 Zoom lens system
US06/318,144 US4492437A (en) 1980-11-04 1981-11-04 Zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55154050A JPS5778513A (en) 1980-11-04 1980-11-04 Zoom lens system

Publications (2)

Publication Number Publication Date
JPS5778513A true JPS5778513A (en) 1982-05-17
JPH0125043B2 JPH0125043B2 (en) 1989-05-16

Family

ID=15575811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55154050A Granted JPS5778513A (en) 1980-11-04 1980-11-04 Zoom lens system

Country Status (1)

Country Link
JP (1) JPS5778513A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592235U (en) * 1982-06-30 1984-01-09 中川　盛雄 Drawer handle fixture
JPS5945980U (en) * 1982-09-17 1984-03-27 戸塚　忠男 cord holder
JPS5946589U (en) * 1982-09-20 1984-03-28 松下電器産業株式会社 Game top board
JPS5949141U (en) * 1982-09-21 1984-04-02 株式会社コロナ Water heater safety device
JPS5955538U (en) * 1982-10-05 1984-04-11 住友ベークライト株式会社 Medical composite tube
US4650291A (en) * 1982-08-13 1987-03-17 Canon Kabushiki Kaisha Zoom lens
US4701034A (en) * 1984-03-02 1987-10-20 Olympus Optical Co., Ltd. Large aperture zoom lens system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4832387A (en) * 1971-08-31 1973-04-28
JPS5215226A (en) * 1975-07-25 1977-02-04 Sony Corp Color demodulation circuit
JPS52117126A (en) * 1976-03-26 1977-10-01 Minolta Camera Co Ltd Telephoto lens system
JPS5366226A (en) * 1976-11-25 1978-06-13 Bell & Howell Japan Focusing system for zoom lens
JPS54155834A (en) * 1978-05-29 1979-12-08 Bell & Howell Japan Large aperture ratio zoom lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4832387A (en) * 1971-08-31 1973-04-28
JPS5215226A (en) * 1975-07-25 1977-02-04 Sony Corp Color demodulation circuit
JPS52117126A (en) * 1976-03-26 1977-10-01 Minolta Camera Co Ltd Telephoto lens system
JPS5366226A (en) * 1976-11-25 1978-06-13 Bell & Howell Japan Focusing system for zoom lens
JPS54155834A (en) * 1978-05-29 1979-12-08 Bell & Howell Japan Large aperture ratio zoom lens

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592235U (en) * 1982-06-30 1984-01-09 中川　盛雄 Drawer handle fixture
US4650291A (en) * 1982-08-13 1987-03-17 Canon Kabushiki Kaisha Zoom lens
JPS5945980U (en) * 1982-09-17 1984-03-27 戸塚　忠男 cord holder
JPS5946589U (en) * 1982-09-20 1984-03-28 松下電器産業株式会社 Game top board
JPS5949141U (en) * 1982-09-21 1984-04-02 株式会社コロナ Water heater safety device
JPH0116993Y2 (en) * 1982-09-21 1989-05-18
JPS5955538U (en) * 1982-10-05 1984-04-11 住友ベークライト株式会社 Medical composite tube
US4701034A (en) * 1984-03-02 1987-10-20 Olympus Optical Co., Ltd. Large aperture zoom lens system

Also Published As

Publication number Publication date
JPH0125043B2 (en) 1989-05-16

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