GB945652A - Improvements in or relating to variable focal length or variable magnification lens systems - Google Patents

Improvements in or relating to variable focal length or variable magnification lens systems

Info

Publication number
GB945652A
GB945652A GB11421/62A GB1142162A GB945652A GB 945652 A GB945652 A GB 945652A GB 11421/62 A GB11421/62 A GB 11421/62A GB 1142162 A GB1142162 A GB 1142162A GB 945652 A GB945652 A GB 945652A
Authority
GB
United Kingdom
Prior art keywords
divergent
focal length
convergent
movable
members
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
GB11421/62A
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 GB945652A publication Critical patent/GB945652A/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
    • G02B15/144113—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 +-++
    • 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
    • G02B15/144109—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)
  • Lenses (AREA)
  • Telescopes (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)

Abstract

945,652. Zoom lenses. P.ANGENIEUX. March 26, 1962 [March 31, 1961], No. 11421/62. Heading G2J. In a variable focal length or variable magnification lens system having a fixed front member and at least two movable members of which the one next to the front is divergent. The front member comprises at least three elements divided into two parts of which the front has a focal length more than 1.20 x that of the rear part and consists of a front divergent element with a concave rear surface and a rear biconvex element, the adjacent surfaces of these elements having a divergent effect, the ratio or the radius of the rear surface or the biconvex element to that of the front surface of the divergent element being less than 2, and the radius of said front surface being more than 2 Î the focal length of the front member, whereas the rear surface of the rear part is concave and has a radius greater than the focal length of the front member. In the objective shown, the rear part of the front member I is a simple convergent meniscus with radii R5, R6, the members II and III are respectively divergent and convergent and both are movable and the rear member IV is fixed and convergent. Optical data are given for this example and for another example which is an afocal system in which the rear member is convergent and movable and between the front and rear members there are two divergent members of which the front one is movable. Data are also given for other examples of the front member itself in which the divergent and biconvex elements are either in broken contact or cemented together.
GB11421/62A 1961-03-31 1962-03-26 Improvements in or relating to variable focal length or variable magnification lens systems Expired GB945652A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR857439A FR1311131A (en) 1961-03-31 1961-03-31 Improvements to variable focal length lenses

Publications (1)

Publication Number Publication Date
GB945652A true GB945652A (en) 1964-01-08

Family

ID=8752140

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11421/62A Expired GB945652A (en) 1961-03-31 1962-03-26 Improvements in or relating to variable focal length or variable magnification lens systems

Country Status (2)

Country Link
FR (1) FR1311131A (en)
GB (1) GB945652A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3679292A (en) * 1970-05-21 1972-07-25 Ricoh Kk Continuously-variable-magnification afocal lens system
US4240703A (en) * 1977-06-28 1980-12-23 Canon Kabushiki Kaisha Telephoto lens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346320A (en) * 1963-07-17 1967-10-10 Schneider Co Optische Werke High-speed varifocal objective

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3679292A (en) * 1970-05-21 1972-07-25 Ricoh Kk Continuously-variable-magnification afocal lens system
US4240703A (en) * 1977-06-28 1980-12-23 Canon Kabushiki Kaisha Telephoto lens

Also Published As

Publication number Publication date
FR1311131A (en) 1962-12-07

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