FR878741A - Adjustable protection lens - Google Patents

Adjustable protection lens

Info

Publication number
FR878741A
FR878741A FR878741DA FR878741A FR 878741 A FR878741 A FR 878741A FR 878741D A FR878741D A FR 878741DA FR 878741 A FR878741 A FR 878741A
Authority
FR
France
Prior art keywords
protection lens
adjustable protection
adjustable
lens
protection
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)
Inventor
Pierre Angenieux
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 filed Critical
Application granted granted Critical
Publication of FR878741A publication Critical patent/FR878741A/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
    • G02B15/142—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 two groups only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR878741D 1941-09-19 1941-09-19 Adjustable protection lens Expired FR878741A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR878741T 1941-09-19

Publications (1)

Publication Number Publication Date
FR878741A true FR878741A (en) 1943-01-28

Family

ID=9361526

Family Applications (1)

Application Number Title Priority Date Filing Date
FR878741D Expired FR878741A (en) 1941-09-19 1941-09-19 Adjustable protection lens

Country Status (1)

Country Link
FR (1) FR878741A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609727A (en) * 1948-01-10 1952-09-09 Emel Ets Object-glass with a variable focal length
US2784644A (en) * 1953-10-26 1957-03-12 Mcculloch Motors Corp Optical system attachment of variable focus for camera and projector objectives
EP0177856A2 (en) * 1984-10-09 1986-04-16 Agfa-Gevaert AG Photographic copying apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609727A (en) * 1948-01-10 1952-09-09 Emel Ets Object-glass with a variable focal length
US2784644A (en) * 1953-10-26 1957-03-12 Mcculloch Motors Corp Optical system attachment of variable focus for camera and projector objectives
EP0177856A2 (en) * 1984-10-09 1986-04-16 Agfa-Gevaert AG Photographic copying apparatus
EP0177856A3 (en) * 1984-10-09 1986-07-23 Agfa-Gevaert AG Photographic copying apparatus

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