GB2422438B - Stepwise variable zoom lens system - Google Patents

Stepwise variable zoom lens system

Info

Publication number
GB2422438B
GB2422438B GB0501423A GB0501423A GB2422438B GB 2422438 B GB2422438 B GB 2422438B GB 0501423 A GB0501423 A GB 0501423A GB 0501423 A GB0501423 A GB 0501423A GB 2422438 B GB2422438 B GB 2422438B
Authority
GB
United Kingdom
Prior art keywords
zoom lens
lens system
stepwise variable
variable zoom
stepwise
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
GB0501423A
Other versions
GB0501423D0 (en
GB2422438A (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.)
Nucam Corp
Original Assignee
Nucam Corp
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 Nucam Corp filed Critical Nucam Corp
Priority to GB0501423A priority Critical patent/GB2422438B/en
Publication of GB0501423D0 publication Critical patent/GB0501423D0/en
Publication of GB2422438A publication Critical patent/GB2422438A/en
Application granted granted Critical
Publication of GB2422438B publication Critical patent/GB2422438B/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
    • G02B15/143—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 three groups only
    • G02B15/1435—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 three groups only the first group being negative
    • G02B15/143507—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 three 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
GB0501423A 2005-01-24 2005-01-24 Stepwise variable zoom lens system Expired - Fee Related GB2422438B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0501423A GB2422438B (en) 2005-01-24 2005-01-24 Stepwise variable zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0501423A GB2422438B (en) 2005-01-24 2005-01-24 Stepwise variable zoom lens system

Publications (3)

Publication Number Publication Date
GB0501423D0 GB0501423D0 (en) 2005-03-02
GB2422438A GB2422438A (en) 2006-07-26
GB2422438B true GB2422438B (en) 2007-06-13

Family

ID=34259563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0501423A Expired - Fee Related GB2422438B (en) 2005-01-24 2005-01-24 Stepwise variable zoom lens system

Country Status (1)

Country Link
GB (1) GB2422438B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56150716A (en) * 1980-04-24 1981-11-21 Minolta Camera Co Ltd Lens system interchangeable to two kinds of focal length
WO1999059015A1 (en) * 1998-05-08 1999-11-18 Pilkington Pe Limited Dual field-of-view objective system for the infrared

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56150716A (en) * 1980-04-24 1981-11-21 Minolta Camera Co Ltd Lens system interchangeable to two kinds of focal length
WO1999059015A1 (en) * 1998-05-08 1999-11-18 Pilkington Pe Limited Dual field-of-view objective system for the infrared

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Warren J Smith, "Modern Optical Engineering" 2000, McGraw-Hill pages 292-293 *

Also Published As

Publication number Publication date
GB0501423D0 (en) 2005-03-02
GB2422438A (en) 2006-07-26

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Legal Events

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

Effective date: 20130124