GB2281409B - Three group zoom lens system - Google Patents

Three group zoom lens system

Info

Publication number
GB2281409B
GB2281409B GB9421233A GB9421233A GB2281409B GB 2281409 B GB2281409 B GB 2281409B GB 9421233 A GB9421233 A GB 9421233A GB 9421233 A GB9421233 A GB 9421233A GB 2281409 B GB2281409 B GB 2281409B
Authority
GB
United Kingdom
Prior art keywords
zoom lens
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.)
Expired - Fee Related
Application number
GB9421233A
Other versions
GB2281409A (en
GB9421233D0 (en
Inventor
Takayuki Ito
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.)
Pentax Corp
Original Assignee
Asahi Optical Industries 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
Priority to JP36141291 priority Critical
Priority to JP23912592 priority
Application filed by Asahi Optical Industries Co Ltd filed Critical Asahi Optical Industries Co Ltd
Priority to GB9227033A priority patent/GB2262816B/en
Publication of GB9421233D0 publication Critical patent/GB9421233D0/en
Publication of GB2281409A publication Critical patent/GB2281409A/en
Application granted granted Critical
Publication of GB2281409B publication Critical patent/GB2281409B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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 +-+
GB9421233A 1991-12-25 1992-12-29 Three group zoom lens system Expired - Fee Related GB2281409B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP36141291 1991-12-25
JP23912592 1992-09-08
GB9227033A GB2262816B (en) 1991-12-25 1992-12-29 Three group zoom lens system

Publications (3)

Publication Number Publication Date
GB9421233D0 GB9421233D0 (en) 1994-12-07
GB2281409A GB2281409A (en) 1995-03-01
GB2281409B true GB2281409B (en) 1995-10-11

Family

ID=27266524

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9421233A Expired - Fee Related GB2281409B (en) 1991-12-25 1992-12-29 Three group zoom lens system

Country Status (1)

Country Link
GB (1) GB2281409B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230397A (en) * 1978-09-21 1980-10-28 Bell & Howell Company Large aperture extended range zoom lens
US4452513A (en) * 1981-06-19 1984-06-05 Nippon Kogaku K.K. Zoom lens capable of close range photography and method of focusing the same to a short distance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230397A (en) * 1978-09-21 1980-10-28 Bell & Howell Company Large aperture extended range zoom lens
US4452513A (en) * 1981-06-19 1984-06-05 Nippon Kogaku K.K. Zoom lens capable of close range photography and method of focusing the same to a short distance

Also Published As

Publication number Publication date
GB2281409A (en) 1995-03-01
GB9421233D0 (en) 1994-12-07

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 20050105

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20051229