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GB2270577B - Zoom lens system having positive plastics lens - Google Patents

Zoom lens system having positive plastics lens

Info

Publication number
GB2270577B
GB2270577B GB9321995A GB9321995A GB2270577B GB 2270577 B GB2270577 B GB 2270577B GB 9321995 A GB9321995 A GB 9321995A GB 9321995 A GB9321995 A GB 9321995A GB 2270577 B GB2270577 B GB 2270577B
Authority
GB
United Kingdom
Prior art keywords
lens
positive
zoom lens
lens system
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
GB9321995A
Other versions
GB2270577A (en
GB9321995D0 (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 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 JP2292475A external-priority patent/JP2915987B2/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB9321995D0 publication Critical patent/GB9321995D0/en
Publication of GB2270577A publication Critical patent/GB2270577A/en
Application granted granted Critical
Publication of GB2270577B publication Critical patent/GB2270577B/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
    • G02B15/143—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
    • G02B15/1431—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 positive
    • G02B15/143103—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 positive arranged ++-

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
GB9321995A 1990-10-30 1993-10-26 Zoom lens system having positive plastics lens Expired - Fee Related GB2270577B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2292475A JP2915987B2 (en) 1990-10-30 1990-10-30 High-power zoom lens for compact cameras covering a wide angle
GB9122695A GB2251955B (en) 1990-10-30 1991-10-25 Zoom lens system

Publications (3)

Publication Number Publication Date
GB9321995D0 GB9321995D0 (en) 1993-12-15
GB2270577A GB2270577A (en) 1994-03-16
GB2270577B true GB2270577B (en) 1994-06-08

Family

ID=26299745

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9321995A Expired - Fee Related GB2270577B (en) 1990-10-30 1993-10-26 Zoom lens system having positive plastics lens

Country Status (1)

Country Link
GB (1) GB2270577B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4773744A (en) * 1986-12-18 1988-09-27 Olympus Optical Co., Ltd. Compact zoom lens system with a high zooming ratio
GB2224131A (en) * 1988-09-08 1990-04-25 Asahi Optical Co Ltd Three group zoom lens for a compact camera.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4773744A (en) * 1986-12-18 1988-09-27 Olympus Optical Co., Ltd. Compact zoom lens system with a high zooming ratio
GB2224131A (en) * 1988-09-08 1990-04-25 Asahi Optical Co Ltd Three group zoom lens for a compact camera.

Also Published As

Publication number Publication date
GB2270577A (en) 1994-03-16
GB9321995D0 (en) 1993-12-15

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Legal Events

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

Effective date: 20041025