GB1205841A - Lens with variable focal length - Google Patents

Lens with variable focal length

Info

Publication number
GB1205841A
GB1205841A GB3336/68A GB333668A GB1205841A GB 1205841 A GB1205841 A GB 1205841A GB 3336/68 A GB3336/68 A GB 3336/68A GB 333668 A GB333668 A GB 333668A GB 1205841 A GB1205841 A GB 1205841A
Authority
GB
United Kingdom
Prior art keywords
unit
focal length
movable
convergent
lens
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
Application number
GB3336/68A
Other languages
English (en)
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.)
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
Original Assignee
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
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 Societe dOptique Precision Electronique et Mecanique SOPELEM SA filed Critical Societe dOptique Precision Electronique et Mecanique SOPELEM SA
Publication of GB1205841A publication Critical patent/GB1205841A/en
Expired 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
    • G02B15/145—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 five groups only
    • G02B15/1451—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 five groups only the first group being positive
    • G02B15/145121—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 five groups only the first group being positive arranged +-+-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
GB3336/68A 1967-01-25 1968-01-22 Lens with variable focal length Expired GB1205841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR92376A FR1520489A (fr) 1967-01-25 1967-01-25 Objectif à distance focale variable

Publications (1)

Publication Number Publication Date
GB1205841A true GB1205841A (en) 1970-09-16

Family

ID=8624319

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3336/68A Expired GB1205841A (en) 1967-01-25 1968-01-22 Lens with variable focal length

Country Status (7)

Country Link
US (1) US3533679A (US06373033-20020416-M00002.png)
BE (1) BE708122A (US06373033-20020416-M00002.png)
CH (1) CH467461A (US06373033-20020416-M00002.png)
DE (1) DE1622993B1 (US06373033-20020416-M00002.png)
FR (1) FR1520489A (US06373033-20020416-M00002.png)
GB (1) GB1205841A (US06373033-20020416-M00002.png)
NL (1) NL6800404A (US06373033-20020416-M00002.png)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS594687B2 (ja) * 1976-01-28 1984-01-31 キヤノン株式会社 近距離合焦性能の良好なズ−ムレンズ
US4145115A (en) * 1977-03-23 1979-03-20 Vivitar Corporation Zoom lens
US5393843A (en) 1992-08-31 1995-02-28 Shell Oil Company Butadiene polymers having terminal functional groups
JP3167069B2 (ja) * 1993-11-30 2001-05-14 キヤノン株式会社 ズームレンズ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192829A (en) * 1961-06-16 1965-07-06 Yamaji Keizo Varifocal lens system of wide varifocal range
FR1336300A (fr) * 1962-07-11 1963-08-30 Soc Optique Mec Haute Prec Système optique à distance focale variable
GB1064323A (en) * 1962-09-14 1967-04-05 Rank Precision Ind Ltd Improvements in or relating to optical objectives of variable equivalent focal length
US3346320A (en) * 1963-07-17 1967-10-10 Schneider Co Optische Werke High-speed varifocal objective
DE1299903B (de) * 1963-08-27 1969-07-24 Nippon Kogaku Kk Pankratisches Objektiv

Also Published As

Publication number Publication date
DE1622993B1 (de) 1970-10-29
CH467461A (fr) 1969-01-15
US3533679A (en) 1970-10-13
BE708122A (US06373033-20020416-M00002.png) 1968-05-02
NL6800404A (US06373033-20020416-M00002.png) 1968-07-26
FR1520489A (fr) 1968-04-12

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees