GB9421233D0 - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number: GB9421233D0
Authority: GB; United Kingdom
Prior art keywords: zoom lens; lens system; zoom; lens
Prior art date: 1991-12-25
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

GB9421233A

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.)

1991-12-25

Filing date

1992-12-29

Publication date

1994-12-07

1992-12-29 Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd

1992-12-29 Priority claimed from GB9227033A external-priority patent/GB2262816B/en

1994-12-07 Publication of GB9421233D0 publication Critical patent/GB9421233D0/en

1995-03-01 Publication of GB2281409A publication Critical patent/GB2281409A/en

1995-10-11 Application granted granted Critical

1995-10-11 Publication of GB2281409B publication Critical patent/GB2281409B/en

2012-12-29 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
- G02B15/143105—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)

GB9421233A 1991-12-25 1992-12-29 Three group zoom lens system Expired - Fee Related GB2281409B (en)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
JP36141291		1991-12-25
JP23912592		1992-09-08
GB9227033A GB2262816B (en)	1991-12-25	1992-12-29	Three group zoom lens system

Publications (3)

Publication Number	Publication Date
GB9421233D0 true GB9421233D0 (en)	1994-12-07
GB2281409A GB2281409A (en)	1995-03-01
GB2281409B GB2281409B (en)	1995-10-11

Family

ID=27266524

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB9421233A Expired - Fee Related GB2281409B (en)	1991-12-25	1992-12-29	Three group zoom lens system

Country Status (1)

Country	Link
GB (1)	GB2281409B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4230397A (en) *	1978-09-21	1980-10-28	Bell & Howell Company	Large aperture extended range zoom lens
JPS57208522A (en) *	1981-06-19	1982-12-21	Nippon Kogaku Kk <Nikon>	Zoom lens capable of close-up photographing

1992
- 1992-12-29 GB GB9421233A patent/GB2281409B/en not_active Expired - Fee Related

Also Published As

Publication number	Publication date
GB2281409B (en)	1995-10-11
GB2281409A (en)	1995-03-01

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Legal Events

Date	Code	Title	Description
2005-01-26	746	Register noted 'licences of right' (sect. 46/1977)	Effective date: 20050105
2006-08-23	PCNP	Patent ceased through non-payment of renewal fee	Effective date: 20051229