FR572313A - Improvements to lenses used in projection devices - Google Patents

Improvements to lenses used in projection devices

Info

Publication number
FR572313A
FR572313A FR572313DA FR572313A FR 572313 A FR572313 A FR 572313A FR 572313D A FR572313D A FR 572313DA FR 572313 A FR572313 A FR 572313A
Authority
FR
France
Prior art keywords
projection devices
lenses used
lenses
projection
devices
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.)
Compagnie des Lampes
Original Assignee
Compagnie des Lampes
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 Compagnie des Lampes filed Critical Compagnie des Lampes
Application granted granted Critical
Publication of FR572313A publication Critical patent/FR572313A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR572313D 1922-10-18 1923-10-03 Improvements to lenses used in projection devices Expired FR572313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US572313XA 1922-10-18 1922-10-18

Publications (1)

Publication Number Publication Date
FR572313A true FR572313A (en) 1924-06-04

Family

ID=1539266

Family Applications (1)

Application Number Title Priority Date Filing Date
FR572313D Expired FR572313A (en) 1922-10-18 1923-10-03 Improvements to lenses used in projection devices

Country Status (1)

Country Link
FR (1) FR572313A (en)

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