FR2597624A1 - Overhead projector screens and apparatus equipped with a screen according to the invention - Google Patents

Overhead projector screens and apparatus equipped with a screen according to the invention Download PDF

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Publication number
FR2597624A1
FR2597624A1 FR8605747A FR8605747A FR2597624A1 FR 2597624 A1 FR2597624 A1 FR 2597624A1 FR 8605747 A FR8605747 A FR 8605747A FR 8605747 A FR8605747 A FR 8605747A FR 2597624 A1 FR2597624 A1 FR 2597624A1
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FR
France
Prior art keywords
screen according
screen
frosted
wall
screens
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
FR8605747A
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French (fr)
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GRATTAROLA PATRICK
Original Assignee
GRATTAROLA PATRICK
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 GRATTAROLA PATRICK filed Critical GRATTAROLA PATRICK
Priority to FR8605747A priority Critical patent/FR2597624A1/en
Publication of FR2597624A1 publication Critical patent/FR2597624A1/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/54Accessories
    • G03B21/56Projection screens
    • G03B21/60Projection screens characterised by the nature of the surface
    • G03B21/62Translucent screens

Abstract

The invention relates to overhead projector screens and to apparatus equipped with a screen according to the invention. A screen according to the invention is composed of a plurality of layers. It comprises at least one front wall 10 made from metal methacrylate tinted dark, the outer face 10a of which is frosted, and a rear wall 11, made from non-reflecting transparent metal methacrylate whose outer face 11a is frosted. Preferably, it also comprises a translucent frosted sheet 12, for example a sheet of tracing paper, inserted between the front and rear walls. One application is the construction of overhead projector screens of large surface area, which can be used in broad daylight.

Description

Ecrans de rétroprojection et appareils équipés d'un écran selon l'invention
La présente invention a pour objet des écrans de rétroprojection d'images et des appareils de projection équipés d'un tel écran.
Rear-projection screens and devices equipped with a screen according to the invention
The subject of the present invention is screens for rear-projection of images and projection devices equipped with such a screen.

Le secteur technique de l'invention est celui de la rétroprojection d'images. The technical sector of the invention is that of rear projection of images.

Les images de cinéma ou les diapositives sont formées sur des écrans sur lesquels elles peuvent être projetées soit de face, soit de l'arrière et, dans ce dernier cas, on parle de rétroprojection. Cinema images or slides are formed on screens on which they can be projected either from the front or from the rear and, in the latter case, we speak of rear projection.

Lorsqu'on fait de la rétroprojection d'images sur un écran en plein jour ou sur un écran qui est exposé à un éclairage intense, les spectateurs ne voient pas ou voient difficilement 1 image qui est projetée sur l'écran. When rear-projection images on a screen in broad daylight or on a screen which is exposed to intense lighting, the spectators do not see or hardly see 1 image which is projected on the screen.

L'objectif de la présente invention est de procurer des écrans ayant une structure telle qu'ils permettent de voir clairement les images qui sont formées par rétroprojection sur ces écrans, même en plein jour ou en présence d'un éclairage intense de la face avant de l'écran. The objective of the present invention is to provide screens having a structure such that they make it possible to clearly see the images which are formed by rear projection on these screens, even in broad daylight or in the presence of intense lighting of the front face. of the screen.

L'objectif de l'invention est atteint au moyen d'écrans de rétroprojection, caractérisés en ce qu'ils comportent, au moins
- une paroi avant composée d'une ou plusieurs plaques en résine organique de teinte sombre;
- une paroi arrière composée d'une ou plusieurs plaques en résine organique transparente traitée.anti-reflets.
The objective of the invention is achieved by means of rear projection screens, characterized in that they comprise, at least
- a front wall composed of one or more organic resin plates of dark shade;
- a rear wall made up of one or more plates in transparent organic resin treated with anti-glare.

De préférence, un écran selon l'invention comporte, en outre, une feuille dépolie translucide intercalée entre les parois avant et arrière, par exemple une feuille de papier calque. Preferably, a screen according to the invention further comprises a frosted translucent sheet interposed between the front and rear walls, for example a sheet of tracing paper.

Selon un mode de réalisation préférentiel, les parois avant et arrière sont en polyméthacrylate de méthyl. According to a preferred embodiment, the front and rear walls are made of polymethyl methacrylate.

Avantageusement, les faces externes de la paroi avant et de la paroi arrière sont dépolies. Advantageously, the external faces of the front wall and of the rear wall are frosted.

L'invention a pour résultat de nouveaux écrans de rétroprojection très lumineux qui permettent de faire de la rétroprojection d'images en plein jour ou dans un milieu éclairé. The invention results in new very bright rear projection screens which make it possible to make rear projection of images in broad daylight or in a lighted environment.

Les écrans multicouche selon l'invention permettent de réaliser des écrans de grandes dimensions, par exemple des écrans de plusieurs m2 placés à une grande distance de l'appareil de projection tout en conservant de bonnes qualités de visibilité des images projetées contre la face arrière de l'écran. The multilayer screens according to the invention make it possible to produce screens of large dimensions, for example screens of several m2 placed at a great distance from the projection apparatus while retaining good qualities of visibility of the images projected against the rear face of the screen.

L'invention a également pour résultat des appareils de rétroprojection équipés d'un écran multicouche selon l'invention. The invention also results in rear projection devices equipped with a multilayer screen according to the invention.

La description suivante se réfère aux dessins annexés qui représentent, sans aucun caractère limitatif, des exemples de réalisation de l'invention. The following description refers to the appended drawings which represent, without any limiting character, exemplary embodiments of the invention.

La figure 1 est une vue en élévation d'un appareil de rétroprojection. Figure 1 is an elevational view of a rear projection apparatus.

La figure 2 est une coupe transversale d'un écran selon l'invention. Figure 2 is a cross section of a screen according to the invention.

La figure 1 représente un appareil de rétroprojection qui comporte une boite noire 1, qui peut être posée sur un pied 2 réglable en hauteur, par exemple sur un pied télescopique. FIG. 1 represents a rear projection apparatus which comprises a black box 1, which can be placed on a foot 2 adjustable in height, for example on a telescopic foot.

Avantageusement, la liaison 3 entre la botte noire et le pied permet de régler l'inclinaison de la botte. Advantageously, the connection 3 between the black boot and the foot makes it possible to adjust the inclination of the boot.

La boîte 1 contient un appareil de projection 4, par exemple un appareil de projection de diapositives ou de cinéma. Box 1 contains a projection device 4, for example a slide or cinema projection device.

La face arrière de la boîte noire est occupée par un miroir 5 qui reCoit les rayons lumineux provenant de l'appareil de projection 4 et qui les renvoie sur la face arrière d'un écran 6. The rear face of the black box is occupied by a mirror 5 which receives the light rays coming from the projection device 4 and which returns them to the rear face of a screen 6.

Avantageusement, le miroir 5 comporte un dispositif 7 qui permet de régler l'inclinaison du miroir. La botte noire comporte une ouverture d'aération 8. L'appareil de projection est monté sur des pieds 9 qui permettent de régler l'inclinaison du faisceau lumineux. Advantageously, the mirror 5 comprises a device 7 which makes it possible to adjust the inclination of the mirror. The black boot has a ventilation opening 8. The projection device is mounted on feet 9 which make it possible to adjust the inclination of the light beam.

Selon une caractéristique essentielle de l'invention, l'écran 6 sur lequel sont projetée les images visibles de l'exté- rieur, a une structure multicouches destinée à permettre de voir clairement les images même en plein jour ou lorsque l'appareil est placé dans une ambiance très lumineuse. According to an essential characteristic of the invention, the screen 6 on which the images visible from the outside are projected, has a multilayer structure intended to make it possible to clearly see the images even in broad daylight or when the apparatus is placed in a very bright atmosphere.

La figure 2 est une coupe transversale partielle d'un écran 6 selon l'invention. I1 est précisé que la figure 1 représente seulement un exemple non limitatif d'utilisation d'un écran selon l'invention. Figure 2 is a partial cross section of a screen 6 according to the invention. It is specified that FIG. 1 represents only a nonlimiting example of the use of a screen according to the invention.

Un écran selon l'invention comporte une paroi avant 10, c'est-à-dire la paroi située du cAté des spectateurs qui est une plaque en résine organique, de préférence, en résine de polyméthacrylate de méthyle, teintée de couleur sombre. A screen according to the invention comprises a front wall 10, that is to say the wall located on the side of the spectators, which is a plate made of organic resin, preferably made of polymethyl methacrylate resin, tinted in dark color.

Avantageusement la face externe 10a de cette plaque est dépolie. Advantageously, the external face 10a of this plate is frosted.

La paroi 10 peut être composée de plusieurs plaques identiques juxtaposées. L'épaisseur totale de la paroi 10 est comprise entre 2 mm et 5 mm. The wall 10 can be composed of several identical plates juxtaposed. The total thickness of the wall 10 is between 2 mm and 5 mm.

La paroi arrière 11 de l'écran, c' est-à-dire la paroi qui reçoit la lumière du projecteur est une plaque de résine organique transparente, traitée anti-reflets, de préférence, une plaque-en résine de polyméthacrylate de méthyle. The rear wall 11 of the screen, that is to say the wall which receives the light from the projector, is a transparent organic resin plate, treated with anti-glare, preferably a plate made of polymethyl methacrylate resin.

Avantageusement, la face externe lia de la paroi il est dépolie. La paroi 11 peut être composée de plusieurs plaques identiques juxtaposées. L'épaisseur totale de la paroi 11 est comprise entre 2 mm et 5 mm. Advantageously, the external face 11a of the wall is frosted. The wall 11 can be composed of several identical plates juxtaposed. The total thickness of the wall 11 is between 2 mm and 5 mm.

De préférence, un écran selon l'invention comporte, en outre, une feuille translucide dépolie 12 intercalée entre les parois avant et arrière. La feuille 12 est par exemple une feuille de papier calque fort, par exemple un papier calque ayant un poids compris entre 50 et 100 g/m2. Preferably, a screen according to the invention further comprises a frosted translucent sheet 12 interposed between the front and rear walls. The sheet 12 is for example a sheet of strong tracing paper, for example a tracing paper having a weight of between 50 and 100 g / m2.

Un écran selon l'invention pourrait fonctionner sans la présence de la feuille translucide intercalaire 12. Cependant, dans ce cas, on verrait sur l'écran un point brillant dû au point lumineux de l'objectif. La feuille translucide 12 supprime ce point brillant et un écran selon l'invention comporte, de préférence, une feuille translucide intercalée entre la paroi avant et la paroi arrière. A screen according to the invention could operate without the presence of the translucent interlayer sheet 12. However, in this case, we would see on the screen a bright point due to the light point of the objective. The translucent sheet 12 eliminates this shiny point and a screen according to the invention preferably comprises a translucent sheet interposed between the front wall and the rear wall.

La structure multicouche des écrans selon l'invention permet de réaliser des écrans de rétroprojection de plusieurs mètres carrés,visibles en plein jour. Ils permettent de conserver une bonne luminosité de l'image même sur des écrans de grande dimension placés à grande distance de l'appareil de projection.  The multilayer structure of the screens according to the invention makes it possible to produce rear projection screens of several square meters, visible in broad daylight. They make it possible to maintain good image brightness even on large screens placed at a great distance from the projection device.

Claims (7)

REVENDICATIONS 1. Ecran de rétroprojection, caractérisé en ce qu'il comporte, au moins 1. Rear projection screen, characterized in that it comprises, at least - une paroi avant (10) composée d'une ou plusieurs plaques en résine organique de teinte sombre; - a front wall (10) composed of one or more plates of organic resin of dark shade; - une paroi arrière (11) composée d'une ou plusieurs plaques en résine organique transparente traitée anti-reflets. - A rear wall (11) composed of one or more plates of transparent organic resin treated with anti-reflection. 2. Ecran selon la revendication 1, caractérisé en ce qu'il comporte, en outre3 une feuille translucide dépolie (12) intercalée entre lesdites parois avant et arrière. 2. Screen according to claim 1, characterized in that it further comprises3 a frosted translucent sheet (12) interposed between said front and rear walls. 3. Ecran selon la revendication 2, caractérisé en ce que ladite feuille translucide est une feuille de papier calque. 3. Screen according to claim 2, characterized in that said translucent sheet is a sheet of tracing paper. 4. Ecran selon l'une quelconque des revendications 1 à 3, caractérisé en ce que lesdites parois avant et arrière sont en polyméthacrylate de méthyl. 4. Screen according to any one of claims 1 to 3, characterized in that said front and rear walls are made of polymethyl methacrylate. 5. Ecran selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les faces externes (10a, lia) desdites parois arrière et avant sont dépolies. 5. Screen according to any one of claims 1 to 4, characterized in that the external faces (10a, lia) of said rear and front walls are frosted. 6. Ecran selon l'une quelconque des revendications 1 à 5, caractérisé en ce que lesdites parois avant et arrière ont une épaisseur comprise entre 2 mm et 5 mm. 6. Screen according to any one of claims 1 to 5, characterized in that said front and rear walls have a thickness between 2 mm and 5 mm. 7. Appareil de rétroprojection du type comportant une botte noire (1), dont la face avant est équipée d'un écran (6) et qui contient un appareil de projection (4) et un miroir (5) qui re çoit le faisceau lumineux provenant dudit appareil de projection et qui le réfléchit vers la face arrière dudit écran, caractérisé en ce que ledit écran est un écran selon l'une quelconque des revendications 1 à 6.  7. Rear projection apparatus of the type comprising a black boot (1), the front face of which is equipped with a screen (6) and which contains a projection apparatus (4) and a mirror (5) which receives the light beam coming from said projection apparatus and which reflects it towards the rear face of said screen, characterized in that said screen is a screen according to any one of claims 1 to 6.
FR8605747A 1986-04-18 1986-04-18 Overhead projector screens and apparatus equipped with a screen according to the invention Pending FR2597624A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8605747A FR2597624A1 (en) 1986-04-18 1986-04-18 Overhead projector screens and apparatus equipped with a screen according to the invention

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8605747A FR2597624A1 (en) 1986-04-18 1986-04-18 Overhead projector screens and apparatus equipped with a screen according to the invention

Publications (1)

Publication Number Publication Date
FR2597624A1 true FR2597624A1 (en) 1987-10-23

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Application Number Title Priority Date Filing Date
FR8605747A Pending FR2597624A1 (en) 1986-04-18 1986-04-18 Overhead projector screens and apparatus equipped with a screen according to the invention

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FR (1) FR2597624A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1405131A1 (en) * 2001-07-12 2004-04-07 Saint-Gobain Glass France Electrically controllable device having variable optical qualities or system which is holographic,thermotropic or which has suspended particles
FR2941790A1 (en) * 2009-02-03 2010-08-06 Julien Letessier Rear video-projection screen for use on glass pane of store window, has diffusion film encapsulated between water and rot resistant transparent layers and fixed to one of transparent layers by permanent fixing layer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1517793A (en) * 1966-11-18 1968-03-22 Fixed-view projection device with adjustable reflective glass and large screen
US4083626A (en) * 1975-04-04 1978-04-11 Fuji Photo Film Co., Ltd. Rear projection screens
US4184745A (en) * 1978-03-08 1980-01-22 Polaroid Corporation Translucent screen
FR2511516A1 (en) * 1981-08-14 1983-02-18 Cuperman Fernand Portable type projector screen - consists of sheet of tracing paper between non-reflecting glass sheets
DE3138829A1 (en) * 1981-09-30 1983-04-14 Hans J. 6507 Ingelheim Bucher Back projection screen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1517793A (en) * 1966-11-18 1968-03-22 Fixed-view projection device with adjustable reflective glass and large screen
US4083626A (en) * 1975-04-04 1978-04-11 Fuji Photo Film Co., Ltd. Rear projection screens
US4184745A (en) * 1978-03-08 1980-01-22 Polaroid Corporation Translucent screen
FR2511516A1 (en) * 1981-08-14 1983-02-18 Cuperman Fernand Portable type projector screen - consists of sheet of tracing paper between non-reflecting glass sheets
DE3138829A1 (en) * 1981-09-30 1983-04-14 Hans J. 6507 Ingelheim Bucher Back projection screen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1405131A1 (en) * 2001-07-12 2004-04-07 Saint-Gobain Glass France Electrically controllable device having variable optical qualities or system which is holographic,thermotropic or which has suspended particles
FR2941790A1 (en) * 2009-02-03 2010-08-06 Julien Letessier Rear video-projection screen for use on glass pane of store window, has diffusion film encapsulated between water and rot resistant transparent layers and fixed to one of transparent layers by permanent fixing layer

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