FR2455756A1 - Retroprojecteur a lentille de fresnel reflechissante - Google Patents

Retroprojecteur a lentille de fresnel reflechissante

Info

Publication number
FR2455756A1
FR2455756A1 FR7911298A FR7911298A FR2455756A1 FR 2455756 A1 FR2455756 A1 FR 2455756A1 FR 7911298 A FR7911298 A FR 7911298A FR 7911298 A FR7911298 A FR 7911298A FR 2455756 A1 FR2455756 A1 FR 2455756A1
Authority
FR
France
Prior art keywords
lens
epidiascope
transparencies
overlays
onto
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.)
Pending
Application number
FR7911298A
Other languages
English (en)
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.)
PAUL FRERES M RONNET ET CIE
Original Assignee
PAUL FRERES M RONNET ET CIE
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 PAUL FRERES M RONNET ET CIE filed Critical PAUL FRERES M RONNET ET CIE
Priority to FR7911298A priority Critical patent/FR2455756A1/fr
Publication of FR2455756A1 publication Critical patent/FR2455756A1/fr
Pending 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

RETROPROJECTEUR A LENTILLE DE FRESNEL REFLECHISSANTE. UN SYSTEME DIOPTRIQUE DE PROJECTION EST PREVU ENTRE LE DISPOSITIF D'ILLUMINATION ET LA LENTILLE DE FRESNEL. LE SYSTEME DIOPTRIQUE ET LE DISPOSITIF D'ILLUMINATION CONSTITUENT UN ENSEMBLE LOGEABLE DANS LA TETE OPTIQUE. APPLICATION AUX RETROPROJECTEURS A LENTILLE DE FRESNEL REFLECHISSANTE.
FR7911298A 1979-05-04 1979-05-04 Retroprojecteur a lentille de fresnel reflechissante Pending FR2455756A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7911298A FR2455756A1 (fr) 1979-05-04 1979-05-04 Retroprojecteur a lentille de fresnel reflechissante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7911298A FR2455756A1 (fr) 1979-05-04 1979-05-04 Retroprojecteur a lentille de fresnel reflechissante

Publications (1)

Publication Number Publication Date
FR2455756A1 true FR2455756A1 (fr) 1980-11-28

Family

ID=9225051

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7911298A Pending FR2455756A1 (fr) 1979-05-04 1979-05-04 Retroprojecteur a lentille de fresnel reflechissante

Country Status (1)

Country Link
FR (1) FR2455756A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064723A1 (fr) * 1981-05-12 1982-11-17 Riso Kagaku Corporation Rétroprojecteur du type réfléchissant comportant une illumination de sécurité automatique
EP0078774A1 (fr) * 1981-11-04 1983-05-11 Ciba-Geigy Ag Agrandisseur photographique pour utilisation en lumière de jour
EP0104465A1 (fr) * 1982-09-02 1984-04-04 Demolux GmbH & Co.KG. Rétroprojecteur
FR2644253A1 (fr) * 1989-03-07 1990-09-14 Nippon Aidex Co Ltd Retroprojecteur

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064723A1 (fr) * 1981-05-12 1982-11-17 Riso Kagaku Corporation Rétroprojecteur du type réfléchissant comportant une illumination de sécurité automatique
EP0078774A1 (fr) * 1981-11-04 1983-05-11 Ciba-Geigy Ag Agrandisseur photographique pour utilisation en lumière de jour
US4452527A (en) * 1981-11-04 1984-06-05 Ciba-Geigy Ag Photographic enlarger for use in bright light
EP0104465A1 (fr) * 1982-09-02 1984-04-04 Demolux GmbH & Co.KG. Rétroprojecteur
FR2644253A1 (fr) * 1989-03-07 1990-09-14 Nippon Aidex Co Ltd Retroprojecteur

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