[go: up one dir, main page]

JPS55111915A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPS55111915A
JPS55111915A JP1992279A JP1992279A JPS55111915A JP S55111915 A JPS55111915 A JP S55111915A JP 1992279 A JP1992279 A JP 1992279A JP 1992279 A JP1992279 A JP 1992279A JP S55111915 A JPS55111915 A JP S55111915A
Authority
JP
Japan
Prior art keywords
lens
lens group
optical system
negative
zoom 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.)
Granted
Application number
JP1992279A
Other languages
Japanese (ja)
Other versions
JPS6144289B2 (en
Inventor
Kazuo Fujibayashi
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
Priority to JP1992279A priority Critical patent/JPS55111915A/en
Publication of JPS55111915A publication Critical patent/JPS55111915A/en
Publication of JPS6144289B2 publication Critical patent/JPS6144289B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lenses (AREA)

Abstract

PURPOSE: To obtain the miniature zoom lens of large variable power ratios and less aberration fluctuations by forming the optical system with the specified 4 groups of lens groups and letting optical specifications satisfy the specified conditions.
CONSTITUTION: The zoom lens optical system is formed by the positive the 1st lens group for focusing, the negative the 2nd lens group for variable powers moving on the optical axis, the positive the 3rd lens group reciprocatively moving for image plane correction and the negative the 4th lens group the 2nd lens group being constituted by a negative meniscus lens which is convex forward, cemented lens of biconcave and biconvex lenses of a focal length F and a negative lens whose strong concave face is directed. Selecting the optical specifications of this optical system so as to satisfy the conditions of formulas IWIII results in shorter variable power part, smaller size of the zoom lens and well correction of large aberration fluctuations along with variable powers, thereby providing the high-performance zoom lens of a larger variable power ratio, smaller size and wider angle. Here, RIIi: radius of curvature of ith face of the 2nd group lens group. Fω: focal length of wide-angle end of nutire optical system.
COPYRIGHT: (C)1980,JPO&Japio
JP1992279A 1979-02-22 1979-02-22 Zoom lens Granted JPS55111915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1992279A JPS55111915A (en) 1979-02-22 1979-02-22 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1992279A JPS55111915A (en) 1979-02-22 1979-02-22 Zoom lens

Publications (2)

Publication Number Publication Date
JPS55111915A true JPS55111915A (en) 1980-08-29
JPS6144289B2 JPS6144289B2 (en) 1986-10-02

Family

ID=12012705

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1992279A Granted JPS55111915A (en) 1979-02-22 1979-02-22 Zoom lens

Country Status (1)

Country Link
JP (1) JPS55111915A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5735822A (en) * 1980-08-14 1982-02-26 Canon Inc Zoom lens
JPS57168209A (en) * 1981-04-09 1982-10-16 Minolta Camera Co Ltd Zoom lens system
JPS57169716A (en) * 1981-04-10 1982-10-19 Minolta Camera Co Ltd Zoom lens system of high variable magnification including wide angle region
JPS6243615A (en) * 1985-08-22 1987-02-25 Canon Inc Zoom lens with large aperture ratio
JP2005284097A (en) * 2004-03-30 2005-10-13 Nikon Corp Zoom lens with vibration-proof function

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU595035B2 (en) * 1986-04-28 1990-03-22 Dawson Offshore Pty. Ltd. Rotary cleaning device
JPS62294479A (en) * 1986-06-13 1987-12-21 株式会社イセキ開発工機 Cleaner in tube

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50109739A (en) * 1974-02-04 1975-08-29
JPS52128152A (en) * 1976-04-20 1977-10-27 Olympus Optical Co Ltd Highly variable multiplying zoom lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50109739A (en) * 1974-02-04 1975-08-29
JPS52128152A (en) * 1976-04-20 1977-10-27 Olympus Optical Co Ltd Highly variable multiplying zoom lens

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5735822A (en) * 1980-08-14 1982-02-26 Canon Inc Zoom lens
JPS57168209A (en) * 1981-04-09 1982-10-16 Minolta Camera Co Ltd Zoom lens system
JPS57169716A (en) * 1981-04-10 1982-10-19 Minolta Camera Co Ltd Zoom lens system of high variable magnification including wide angle region
JPH028282B2 (en) * 1981-04-10 1990-02-23 Minolta Camera Kk
JPS6243615A (en) * 1985-08-22 1987-02-25 Canon Inc Zoom lens with large aperture ratio
JP2005284097A (en) * 2004-03-30 2005-10-13 Nikon Corp Zoom lens with vibration-proof function

Also Published As

Publication number Publication date
JPS6144289B2 (en) 1986-10-02

Similar Documents

Publication Publication Date Title
JPS55163510A (en) Telephoto lens
JPS54157620A (en) Photographic telephoto lens
JPS5744115A (en) Reflex telephoto zoom lens system
JPS54127322A (en) Zoom lens
JPS55147606A (en) Telephoto lens
JPS5659217A (en) Lens for compact camera of short overall length using aspherical face
JPS54119233A (en) Finder optical system
JPS57190917A (en) Superwide-angle zoom lens
JPS5691206A (en) Wide-angle photographic lens of short overall length
JPS5643618A (en) Attachment lens
JPS55111915A (en) Zoom lens
JPS5767908A (en) Wide-angle zoom lens
JPS5648607A (en) Wide-angle zoom lens
JPS57135913A (en) Zoom lens
JPS5655915A (en) Zoom lens
JPS55130510A (en) Afocal barrel lens
JPS5470826A (en) Wide-angle objective lens
JPS54158225A (en) Photographic lens having long back focus and large aperture ratio
JPS557712A (en) Compact standard zoom lens
JPS64512A (en) Albada system zoom finder
JPS57165809A (en) Telephoto lens system
JPS56132306A (en) Small-sized zoom lens
JPS5643619A (en) Wide angle zoom lens
JPS5659216A (en) Standard lens with wide angle of view
JPS5612614A (en) Compact zoom lens system