GB9321995D0 - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number: GB9321995D0
Authority: GB; United Kingdom
Prior art keywords: zoom lens; lens system; zoom; lens
Prior art date: 1990-10-30
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.): Granted

Application number

GB939321995A

Other versions

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.)

1990-10-30

Filing date

1993-10-26

Publication date

1993-12-15

1990-10-30 Priority claimed from JP2292475A external-priority patent/JP2915987B2/en

1993-10-26 Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd

1993-12-15 Publication of GB9321995D0 publication Critical patent/GB9321995D0/en

1994-03-16 Publication of GB2270577A publication Critical patent/GB2270577A/en

1994-06-08 Application granted granted Critical

1994-06-08 Publication of GB2270577B publication Critical patent/GB2270577B/en

2011-10-25 Anticipated expiration legal-status Critical

Status Expired - Fee Related legal-status Critical Current

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 true GB9321995D0 (en)	1993-12-15
GB2270577A GB2270577A (en)	1994-03-16
GB2270577B 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)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPH083580B2 (en) *	1986-12-18	1996-01-17	オリンパス光学工業株式会社	Compact high-magnification zoom lens
US4978204A (en) *	1988-09-08	1990-12-18	Asahi Kogaku Kogyo Kabushik Kaisha	High zoom-ratio zoom lens system for use in a compact camera

1993
- 1993-10-26 GB GB9321995A patent/GB2270577B/en not_active Expired - Fee Related

Also Published As

Publication number	Publication date
GB2270577A (en)	1994-03-16
GB2270577B (en)	1994-06-08

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Legal Events

Date	Code	Title	Description
2005-06-15	PCNP	Patent ceased through non-payment of renewal fee	Effective date: 20041025