JPS57192918A - Compact zoom lens - Google Patents

Compact zoom lens

Info

Publication number
JPS57192918A
JPS57192918A JP56077935A JP7793581A JPS57192918A JP S57192918 A JPS57192918 A JP S57192918A JP 56077935 A JP56077935 A JP 56077935A JP 7793581 A JP7793581 A JP 7793581A JP S57192918 A JPS57192918 A JP S57192918A
Authority
JP
Japan
Prior art keywords
lens
positive
lens group
lens groups
focal distance
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
JP56077935A
Other languages
Japanese (ja)
Other versions
JPS6248809B2 (en
Inventor
Hisao Fujita
Shozo Ishiyama
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta 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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP56077935A priority Critical patent/JPS57192918A/en
Priority to US06/381,311 priority patent/US4501475A/en
Publication of JPS57192918A publication Critical patent/JPS57192918A/en
Publication of JPS6248809B2 publication Critical patent/JPS6248809B2/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
    • G02B15/144—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
    • G02B15/145—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 five groups only
    • G02B15/1451—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 five groups only the first group being positive
    • G02B15/145129—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 five groups only the first group being positive arranged +-+++

Abstract

PURPOSE:To produce a miniaturized lens with the zoom ratio of about 3 accompanied with 5 numerical limitation formulas by composing the lens system of 4 lens groups with positive, negative, positive, and positive refractive power to be arrayed in order from the object side, and moving the 1st and 4th lens groups to the object side and the 2nd lens group to the image side. CONSTITUTION:A titled zoom lens consists of the 1st lens group with positive focal distance, the 2nd lens group with negative focal distance, the 3rd lens group with positive forcal distance, and the 4th lens group with positive focal distance. At the time of zooming from wide angle to telephoto positions, the 1st and the 4th lens groups are moved to the object side, the 2nd lens group is moved to the image side and the 3rd lens group is fixed or slightly moved so that the spaces between the 3rd and 2nd lens groups and between the 3rd and 4th lens groups are reduced. The composite focal distance of the 1st and 2nd lens groups is always negative and these lens groups are arrayed so as to be a retro-type in the wide angle side and a tele-type in the telephoto side.
JP56077935A 1981-05-25 1981-05-25 Compact zoom lens Granted JPS57192918A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56077935A JPS57192918A (en) 1981-05-25 1981-05-25 Compact zoom lens
US06/381,311 US4501475A (en) 1981-05-25 1982-05-24 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56077935A JPS57192918A (en) 1981-05-25 1981-05-25 Compact zoom lens

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP61117574A Division JPS61258220A (en) 1986-05-23 1986-05-23 Compact zoom lens

Publications (2)

Publication Number Publication Date
JPS57192918A true JPS57192918A (en) 1982-11-27
JPS6248809B2 JPS6248809B2 (en) 1987-10-15

Family

ID=13647930

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56077935A Granted JPS57192918A (en) 1981-05-25 1981-05-25 Compact zoom lens

Country Status (1)

Country Link
JP (1) JPS57192918A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195213A (en) * 1981-05-26 1982-11-30 Konishiroku Photo Ind Co Ltd Compact zoom lens
JPS58224323A (en) * 1982-06-23 1983-12-26 Asahi Optical Co Ltd Zoom lens
JPS61258220A (en) * 1986-05-23 1986-11-15 Konishiroku Photo Ind Co Ltd Compact zoom lens
JPH0266509A (en) * 1988-08-31 1990-03-06 Canon Inc Zoom lens
JPH0312621A (en) * 1989-06-09 1991-01-21 Canon Inc Rear focus type zoom lens
JPH0312622A (en) * 1989-06-09 1991-01-21 Canon Inc Rear focus type zoom lens
JPH0375712A (en) * 1989-08-18 1991-03-29 Nikon Corp Zoom lens
JPH08248319A (en) * 1995-03-13 1996-09-27 Canon Inc Zoom lens

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430855A (en) * 1977-07-30 1979-03-07 Asahi Optical Co Ltd Wide angle zoom lens system having high variable magnification
JPS5515102A (en) * 1978-07-17 1980-02-02 Sigma:Kk High power telescopic zoom lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430855A (en) * 1977-07-30 1979-03-07 Asahi Optical Co Ltd Wide angle zoom lens system having high variable magnification
JPS5515102A (en) * 1978-07-17 1980-02-02 Sigma:Kk High power telescopic zoom lens

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195213A (en) * 1981-05-26 1982-11-30 Konishiroku Photo Ind Co Ltd Compact zoom lens
JPS6151297B2 (en) * 1981-05-26 1986-11-08 Konishiroku Photo Ind
JPS58224323A (en) * 1982-06-23 1983-12-26 Asahi Optical Co Ltd Zoom lens
JPS6160418B2 (en) * 1982-06-23 1986-12-20 Asahi Optical Co Ltd
JPS61258220A (en) * 1986-05-23 1986-11-15 Konishiroku Photo Ind Co Ltd Compact zoom lens
JPH0266509A (en) * 1988-08-31 1990-03-06 Canon Inc Zoom lens
JPH0312621A (en) * 1989-06-09 1991-01-21 Canon Inc Rear focus type zoom lens
JPH0312622A (en) * 1989-06-09 1991-01-21 Canon Inc Rear focus type zoom lens
JPH0375712A (en) * 1989-08-18 1991-03-29 Nikon Corp Zoom lens
JPH08248319A (en) * 1995-03-13 1996-09-27 Canon Inc Zoom lens

Also Published As

Publication number Publication date
JPS6248809B2 (en) 1987-10-15

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