FR2455756A1 - Retroprojecteur a lentille de fresnel reflechissante - Google Patents
Retroprojecteur a lentille de fresnel reflechissanteInfo
- 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
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.
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)
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 |
-
1979
- 1979-05-04 FR FR7911298A patent/FR2455756A1/fr active Pending
Cited By (5)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5262434A (en) | Image distortion correction device for projector | |
JPS5596933A (en) | Overhead projector | |
US4183644A (en) | Photographic background device | |
GB943346A (en) | Optical projector | |
FR2455756A1 (fr) | Retroprojecteur a lentille de fresnel reflechissante | |
GB2022861A (en) | Rear Projection Screen | |
GB1515654A (en) | Optical projection device | |
JPS5557840A (en) | Overhead projector capable of projecting on vertical plane | |
JPS54139569A (en) | Light bulb type projector | |
GB1443464A (en) | Optical projection apparatus | |
US3658415A (en) | Off axis low volume microform projector | |
GB1384561A (en) | Photographic projection viewer | |
JPS6459226A (en) | Projection type projector | |
CA2014370A1 (fr) | Projecteur opaque | |
JPS5726837A (en) | Comparison projector | |
GB1533687A (en) | Microfilm image projection apparatus | |
GB1537341A (en) | Optical projectors | |
GB701396A (en) | Improvements in or relating to optical systems | |
JPS56168678A (en) | Projection observing and copying device | |
JPS5461527A (en) | Projector | |
JPS53138326A (en) | Projector | |
JPS6482024A (en) | Image output device | |
JPS578533A (en) | Microfilm projector | |
FR2328982A1 (fr) | Appareil a diffusion de photos et films diapositives | |
JPH0267312U (fr) |