GB2431247B - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number
GB2431247B
GB2431247B GB0520949A GB0520949A GB2431247B GB 2431247 B GB2431247 B GB 2431247B GB 0520949 A GB0520949 A GB 0520949A GB 0520949 A GB0520949 A GB 0520949A GB 2431247 B GB2431247 B GB 2431247B
Authority
GB
United Kingdom
Prior art keywords
zoom lens
lens system
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
GB0520949A
Other versions
GB2431247A (en
GB0520949D0 (en
Inventor
Kuo-Wen Chang
Ming-Sen Tsao
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.)
Foxlink Image Technology Co Ltd
Original Assignee
Foxlink Image Technology 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 Foxlink Image Technology Co Ltd filed Critical Foxlink Image Technology Co Ltd
Priority to GB0520949A priority Critical patent/GB2431247B/en
Publication of GB0520949D0 publication Critical patent/GB0520949D0/en
Publication of GB2431247A publication Critical patent/GB2431247A/en
Application granted granted Critical
Publication of GB2431247B publication Critical patent/GB2431247B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • G02B15/1445—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 negative
    • G02B15/144511—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 negative 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
    • G02B15/16—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
    • G02B15/177—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 negative front lens or group of lenses
GB0520949A 2005-10-14 2005-10-14 Zoom lens system Expired - Fee Related GB2431247B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0520949A GB2431247B (en) 2005-10-14 2005-10-14 Zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0520949A GB2431247B (en) 2005-10-14 2005-10-14 Zoom lens system

Publications (3)

Publication Number Publication Date
GB0520949D0 GB0520949D0 (en) 2005-11-23
GB2431247A GB2431247A (en) 2007-04-18
GB2431247B true GB2431247B (en) 2007-11-07

Family

ID=35451778

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0520949A Expired - Fee Related GB2431247B (en) 2005-10-14 2005-10-14 Zoom lens system

Country Status (1)

Country Link
GB (1) GB2431247B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078481A (en) * 1989-09-05 1992-01-07 Canon Kabushiki Kaisha Magnification changing lens
JPH1020192A (en) * 1996-07-09 1998-01-23 Ricoh Opt Ind Co Ltd Zoom lens for projector
US5805350A (en) * 1996-03-04 1998-09-08 Fuji Photo Optical Co. Ltd. Wide zoom lens
US5914820A (en) * 1996-10-30 1999-06-22 Minolta Co., Ltd. Zoom lens system
US20050030641A1 (en) * 2003-08-05 2005-02-10 Keiichi Kuba Vari-focal optical system
US20050068616A1 (en) * 2003-09-26 2005-03-31 Takeshi Hosoya Real image type zoom finder, and imaging system incorporating the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078481A (en) * 1989-09-05 1992-01-07 Canon Kabushiki Kaisha Magnification changing lens
US5805350A (en) * 1996-03-04 1998-09-08 Fuji Photo Optical Co. Ltd. Wide zoom lens
JPH1020192A (en) * 1996-07-09 1998-01-23 Ricoh Opt Ind Co Ltd Zoom lens for projector
US5914820A (en) * 1996-10-30 1999-06-22 Minolta Co., Ltd. Zoom lens system
US20050030641A1 (en) * 2003-08-05 2005-02-10 Keiichi Kuba Vari-focal optical system
US20050068616A1 (en) * 2003-09-26 2005-03-31 Takeshi Hosoya Real image type zoom finder, and imaging system incorporating the same

Also Published As

Publication number Publication date
GB2431247A (en) 2007-04-18
GB0520949D0 (en) 2005-11-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20111014