FR1123471A - Improvements to optical devices with variable focal length - Google Patents

Improvements to optical devices with variable focal length

Info

Publication number
FR1123471A
FR1123471A FR1123471DA FR1123471A FR 1123471 A FR1123471 A FR 1123471A FR 1123471D A FR1123471D A FR 1123471DA FR 1123471 A FR1123471 A FR 1123471A
Authority
FR
France
Prior art keywords
focal length
optical devices
variable focal
variable
optical
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
Other languages
French (fr)
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.)
APPLIC TECH ET D EXPL CINEMATO
Original Assignee
APPLIC TECH ET D EXPL CINEMATO
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 APPLIC TECH ET D EXPL CINEMATO filed Critical APPLIC TECH ET D EXPL CINEMATO
Application granted granted Critical
Publication of FR1123471A publication Critical patent/FR1123471A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/18—Motion-picture cameras
    • 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
    • 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
    • G02B15/1445—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 negative

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR1123471D 1955-01-19 1955-01-19 Improvements to optical devices with variable focal length Expired FR1123471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1123471T 1955-01-19

Publications (1)

Publication Number Publication Date
FR1123471A true FR1123471A (en) 1956-09-21

Family

ID=9633261

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1123471D Expired FR1123471A (en) 1955-01-19 1955-01-19 Improvements to optical devices with variable focal length

Country Status (1)

Country Link
FR (1) FR1123471A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937572A (en) * 1958-01-14 1960-05-24 Canon Camera Co Varifocal lens systems
US2959101A (en) * 1957-09-20 1960-11-08 Bell & Howell Co Optical objective of variable equivalent focal length
US3038378A (en) * 1959-01-12 1962-06-12 Bell & Howell Co Variable focal length optical objective

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959101A (en) * 1957-09-20 1960-11-08 Bell & Howell Co Optical objective of variable equivalent focal length
US2937572A (en) * 1958-01-14 1960-05-24 Canon Camera Co Varifocal lens systems
US3038378A (en) * 1959-01-12 1962-06-12 Bell & Howell Co Variable focal length optical objective

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