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GB2281412B - Two group zoom lens system - Google Patents

Two group zoom lens system

Info

Publication number
GB2281412B
GB2281412B GB9421715A GB9421715A GB2281412B GB 2281412 B GB2281412 B GB 2281412B GB 9421715 A GB9421715 A GB 9421715A GB 9421715 A GB9421715 A GB 9421715A GB 2281412 B GB2281412 B GB 2281412B
Authority
GB
United Kingdom
Prior art keywords
zoom lens
lens system
group zoom
group
zoom
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
GB9421715A
Other versions
GB2281412A (en
GB9421715D0 (en
Inventor
Takayuki Ito
Sachio Hasushita
Shuji Yoneyama
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 Kogaku Kogyo 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 claimed from JP09680292A external-priority patent/JP3294870B2/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB9421715D0 publication Critical patent/GB9421715D0/en
Publication of GB2281412A publication Critical patent/GB2281412A/en
Application granted granted Critical
Publication of GB2281412B publication Critical patent/GB2281412B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B15/142—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 two groups only
    • 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
    • G02B15/142—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 two groups only
    • G02B15/1421—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 two groups only the first group being positive

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
GB9421715A 1991-07-04 1992-07-06 Two group zoom lens system Expired - Fee Related GB2281412B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP26148291 1991-07-04
JP09680292A JP3294870B2 (en) 1991-07-04 1992-04-16 Zoom lens
GB9214310A GB2258320B (en) 1991-07-04 1992-07-06 Zoom lens system

Publications (3)

Publication Number Publication Date
GB9421715D0 GB9421715D0 (en) 1994-12-14
GB2281412A GB2281412A (en) 1995-03-01
GB2281412B true GB2281412B (en) 1995-05-10

Family

ID=27266282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9421715A Expired - Fee Related GB2281412B (en) 1991-07-04 1992-07-06 Two group zoom lens system

Country Status (1)

Country Link
GB (1) GB2281412B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1285020B1 (en) * 1996-03-19 1998-06-03 Microtecnica TWO-WAY CONTROL VALVE WITH VARIABLE PASSAGE SECTION FOR A REFRIGERANT CIRCUIT

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983027A (en) * 1988-03-31 1991-01-08 Minolta Camera Kabushiki Kaisha Compact zoom lens system with a high zoom ratio
GB2240637A (en) * 1989-11-21 1991-08-07 Asahi Optical Co Ltd Zoom lens system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983027A (en) * 1988-03-31 1991-01-08 Minolta Camera Kabushiki Kaisha Compact zoom lens system with a high zoom ratio
GB2240637A (en) * 1989-11-21 1991-08-07 Asahi Optical Co Ltd Zoom lens system

Also Published As

Publication number Publication date
GB2281412A (en) 1995-03-01
GB9421715D0 (en) 1994-12-14

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Legal Events

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

Effective date: 20060706