JPH03293309A - Variable power lens - Google Patents

Variable power lens

Info

Publication number
JPH03293309A
JPH03293309A JP2095464A JP9546490A JPH03293309A JP H03293309 A JPH03293309 A JP H03293309A JP 2095464 A JP2095464 A JP 2095464A JP 9546490 A JP9546490 A JP 9546490A JP H03293309 A JPH03293309 A JP H03293309A
Authority
JP
Japan
Prior art keywords
lens
variable power
piece
positive
negative
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
JP2095464A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Hata
Original Assignee
Minolta Camera 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 Camera Co Ltd filed Critical Minolta Camera Co Ltd
Priority to JP2095464A priority Critical patent/JPH03293309A/en
Publication of JPH03293309A publication Critical patent/JPH03293309A/en
Priority claimed from US08/197,006 external-priority patent/US5543970A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical 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
    • G02B15/143Optical 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
    • G02B15/1431Optical 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
    • G02B15/143105Optical 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 +-+

Abstract

PURPOSE: To obtain the variable power lens having a high variable power ratio and being compact by allowing a lens group of three groups having positive, negative and positive refracting power from an object side to have a prescribed characteristic.
CONSTITUTION: The variable power lens is constituted of a first group I having positive refracting power, a second group II of negative refracting power, and a third group of positive refracting power in order from an object side. This first group I contains one piece of high dispersion negative lens d1 and at least one piece of positive lens d3, and second group II contains one piece of high dispersion positive lens d7 and at least one piece of negative lens d5, and also, they are constituted of lenses of three pieces or less in all. A third lens III has at least one piece of high dispersion negative lens d12 and one piece or two pieces of positive lens components d10 on the object side of this lens d12. A second group II and a third group III have as aspherical face, and move on an optical axis at the time of variable power. In such a way, the variable power lens which has a high variable power ratio and a large aperture ratio, and also, whose compaction, low cost and high performance of an aberration are attained can be obtained.
COPYRIGHT: (C)1991,JPO&Japio
JP2095464A 1990-04-11 1990-04-11 Variable power lens Pending JPH03293309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2095464A JPH03293309A (en) 1990-04-11 1990-04-11 Variable power lens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2095464A JPH03293309A (en) 1990-04-11 1990-04-11 Variable power lens
US08/197,006 US5543970A (en) 1990-04-11 1994-02-15 Zoom lens system

Publications (1)

Publication Number Publication Date
JPH03293309A true JPH03293309A (en) 1991-12-25

Family

ID=14138382

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2095464A Pending JPH03293309A (en) 1990-04-11 1990-04-11 Variable power lens

Country Status (1)

Country Link
JP (1) JPH03293309A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04106512A (en) * 1990-08-27 1992-04-08 Canon Inc Rear focus system variable power lens
JPH0519163A (en) * 1991-07-12 1993-01-29 Canon Inc Zoom lens
US5268793A (en) * 1992-01-29 1993-12-07 Minolta Camera Kabushiki Kaisha Zoom lens system
JPH0634886A (en) * 1992-07-20 1994-02-10 Olympus Optical Co Ltd Variable power lens
JP2011112788A (en) * 2009-11-25 2011-06-09 Nikon Corp Zoom lens, optical apparatus, and method for manufacturing zoom lens
US9146386B2 (en) 2009-11-25 2015-09-29 Nikon Corporation Optical element, zoom lens, optical apparatus, method for manufacturing optical element and method for manufacturing zoom lens
CN107942485A (en) * 2017-10-19 2018-04-20 瑞声科技(新加坡)有限公司 Camera optical camera lens
CN107942489A (en) * 2017-10-19 2018-04-20 瑞声科技(新加坡)有限公司 Camera optical camera lens
JP6384939B1 (en) * 2017-10-19 2018-09-05 エーエーシー テクノロジーズ ピーティーイー リミテッドAac Technologies Pte.Ltd. Imaging optical lens

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04106512A (en) * 1990-08-27 1992-04-08 Canon Inc Rear focus system variable power lens
JPH0519163A (en) * 1991-07-12 1993-01-29 Canon Inc Zoom lens
US5268793A (en) * 1992-01-29 1993-12-07 Minolta Camera Kabushiki Kaisha Zoom lens system
JPH0634886A (en) * 1992-07-20 1994-02-10 Olympus Optical Co Ltd Variable power lens
JP2011112788A (en) * 2009-11-25 2011-06-09 Nikon Corp Zoom lens, optical apparatus, and method for manufacturing zoom lens
US9146386B2 (en) 2009-11-25 2015-09-29 Nikon Corporation Optical element, zoom lens, optical apparatus, method for manufacturing optical element and method for manufacturing zoom lens
CN107942485A (en) * 2017-10-19 2018-04-20 瑞声科技(新加坡)有限公司 Camera optical camera lens
CN107942489A (en) * 2017-10-19 2018-04-20 瑞声科技(新加坡)有限公司 Camera optical camera lens
JP6384939B1 (en) * 2017-10-19 2018-09-05 エーエーシー テクノロジーズ ピーティーイー リミテッドAac Technologies Pte.Ltd. Imaging optical lens
CN107942485B (en) * 2017-10-19 2020-01-17 瑞声科技(新加坡)有限公司 Image pickup optical lens
CN107942489B (en) * 2017-10-19 2020-02-04 瑞声科技(新加坡)有限公司 Image pickup optical lens

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