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GB975160A - Improvements in or relating to variable focal length lens systems - Google Patents

Improvements in or relating to variable focal length lens systems

Info

Publication number
GB975160A
GB975160A GB12499/63A GB1249963A GB975160A GB 975160 A GB975160 A GB 975160A GB 12499/63 A GB12499/63 A GB 12499/63A GB 1249963 A GB1249963 A GB 1249963A GB 975160 A GB975160 A GB 975160A
Authority
GB
United Kingdom
Prior art keywords
divergent
convergent
objective
focal length
relating
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
GB12499/63A
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.)
Pierre Angenieux SA
Original Assignee
Pierre Angenieux 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 Pierre Angenieux SA filed Critical Pierre Angenieux SA
Publication of GB975160A publication Critical patent/GB975160A/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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144105—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 four groups only the first group being positive arranged +-+-

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Endoscopes (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)
  • Lenses (AREA)

Abstract

975,160. Varifocal objectives. P. ANGENIEUX. March 29,1963 [June 23,1962; Nov. 22, 1962], No. 12499/63. Heading G2J. The convergent front member of the objective has a convergent rear part and a divergent front part, the latter being axially movable for focusing. Preferably the objective is of the type having a convergent front member C1, a movable divergent member C2, a movable convergent member C3 and a fixed convergent rear member C4. In this objective the divergent part of the front member is made up of three elements 21, 22 and 23, element 22 being a convergent meniscus of which the front surface has a radius of curvature less than the focal length f of the divergent part but greater than 0.40f. This meniscus in a second embodiment forms the rear element of the divergent part of the front member and, in a further embodiment, it is embraced by two divergent elements at the front and another divergent element at the rear. Optical data are given for three examples, one being of an objective as shown.
GB12499/63A 1962-06-23 1963-03-29 Improvements in or relating to variable focal length lens systems Expired GB975160A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR901732A FR1333932A (en) 1962-06-23 1962-06-23 Variable focal length lens
FR916120A FR82637E (en) 1962-06-23 1962-11-21 Variable focal length lens

Publications (1)

Publication Number Publication Date
GB975160A true GB975160A (en) 1964-11-11

Family

ID=26196296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12499/63A Expired GB975160A (en) 1962-06-23 1963-03-29 Improvements in or relating to variable focal length lens systems

Country Status (2)

Country Link
FR (2) FR1333932A (en)
GB (1) GB975160A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5156645A (en) * 1974-11-13 1976-05-18 Yashica Co Ltd Kokakuzuumurenzukei
US4270848A (en) * 1975-11-21 1981-06-02 Pierre Angenieux Image enlarging optical variator
JPS5915214A (en) * 1982-07-17 1984-01-26 Canon Inc Focusing method of zoom lens
GB2157016A (en) * 1984-04-05 1985-10-16 Vivitar Corp Zoom lens having three groups
US7123421B1 (en) 2005-04-22 2006-10-17 Panavision International, L.P. Compact high performance zoom lens system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1571069A (en) * 1967-06-30 1969-06-13
JPS56107211A (en) * 1980-01-31 1981-08-26 Canon Inc Zoom lens

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5156645A (en) * 1974-11-13 1976-05-18 Yashica Co Ltd Kokakuzuumurenzukei
US4270848A (en) * 1975-11-21 1981-06-02 Pierre Angenieux Image enlarging optical variator
JPS5915214A (en) * 1982-07-17 1984-01-26 Canon Inc Focusing method of zoom lens
JPS6153696B2 (en) * 1982-07-17 1986-11-19 Canon Kk
GB2157016A (en) * 1984-04-05 1985-10-16 Vivitar Corp Zoom lens having three groups
US7123421B1 (en) 2005-04-22 2006-10-17 Panavision International, L.P. Compact high performance zoom lens system

Also Published As

Publication number Publication date
FR1333932A (en) 1963-08-02
FR82637E (en) 1964-03-20

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