WO1996024087A1 - Method for improving the manufacture of an optical selector screen moulding die, and resulting screen - Google Patents

Method for improving the manufacture of an optical selector screen moulding die, and resulting screen Download PDF

Info

Publication number
WO1996024087A1
WO1996024087A1 PCT/FR1996/000139 FR9600139W WO9624087A1 WO 1996024087 A1 WO1996024087 A1 WO 1996024087A1 FR 9600139 W FR9600139 W FR 9600139W WO 9624087 A1 WO9624087 A1 WO 9624087A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical selector
optical
screen
photographic emulsion
light
Prior art date
Application number
PCT/FR1996/000139
Other languages
French (fr)
Inventor
Pascal Tallet
Original Assignee
Pascal Tallet
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 Pascal Tallet filed Critical Pascal Tallet
Publication of WO1996024087A1 publication Critical patent/WO1996024087A1/en

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
    • G03B35/00—Stereoscopic photography
    • G03B35/18—Stereoscopic photography by simultaneous viewing
    • G03B35/24—Stereoscopic photography by simultaneous viewing using apertured or refractive resolving means on screens or between screen and eye
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
    • 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
    • G03B35/00—Stereoscopic photography
    • G03B35/14—Printing apparatus specially adapted for conversion between different types of record

Definitions

  • the present invention relates to a new method for improving the manufacture of a mold for molding an optical selector intended itself for molding an optical selector screen by thermoforming or by injection and the screen thus obtained.
  • This process aims to considerably improve the optical quality of an optical selector screen and in addition to allow easier industrialization in large series of three-dimensional relief images.
  • the final object of the present invention is to improve the optical precision and the industrial quality of the optical selector obtained by said method.
  • each groove obtained by known methods and means does not allow to produce, by thermoforming or by injection, lenses of an optimal shape.
  • the etching of each groove is, in known means, carried out using a lathe. The main drawback of this ancient method of obtaining an engraving in helical form is that it engraves each groove at an angle relative to the right edge of the optical selector screen then produced by thermoforming or by injection.
  • the present invention relates to a novel method of etching a molding matrix intended to obtain an optical selector screen with better optical performance.
  • the depth of field obtained also allows to increase the restitution of the relief of an object photographed by the relief image.
  • a first characteristic of the invention relates to a molding matrix (1) intended to obtain an optical selector screen for viewing three-dimensional photographs, in this matrix the engravings of each groove are obtained by a new d-shaped curve 'arc of ellipse (2) instead of the arc of a circle; the new curve of each groove corresponds to that formed by the major axis of the ellipse; this new curve is more flattened compared to the arc of a circle, the optical selector obtained is placed on a photographic emulsion.
  • the optical selector screen obtained with this matrix the emergence of light rays (5) at the nodal point (6) of the image formed on the focal plane is wider. This screen is then placed on a photographic emulsion by laminating.
  • the new optical selector thus obtained by the improvement of the engraving process, allows a better focusing of the image when shooting for three-dimensional photography.
  • the emergence of light rays (5) at the nodal point (6) of the image thus formed on the focal plane is wider in FIG. 3.
  • the focal distance of each lens of each lens relative to the photographic emulsion (7) depending on the distance from the subject, thus accepts better tolerance.
  • the first cone formed (8) during the refraction of the light in each lens (4) makes it possible to go in fact more beyond and below the light point (9) formed on the photographic emulsion (7) on which it is arranged.
  • the light beams of the screen print a larger surface (10) of the photographic emulsion (7) on which it is arranged, thus offering better resolution and reducing the phenomenon of vignetting.
  • This new etching process also makes it possible to achieve a better depth of the focal point of each lens, and therefore to obtain a validly precise image, which was not the case with the known processes.
  • the sharpness of the image formed on the photographic emulsion is obtained by virtue of a better latitude for adjusting the distance from the depth of the focal point of each lens.
  • the cone formed (8) when the light is refracted in each lens is obtained by virtue of a better latitude for adjusting the distance from the depth of the focal point of each lens.
  • the light beams when they pass through each lens also print a larger surface (10) of the photographic emulsion (7) placed under the optical selector. This has the particular advantage of increasing the number of points per cm 2 exposed from the photosensitive surface of the photographic emulsion.
  • the light beams (5) are in fact more extensive on the photosensitive surface of the photographic emulsion and offer better brightness of the fig image 4.
  • this new etching process makes it possible to reduce the vignetting phenomenon of the optical selector.
  • Closing or opening the diaphragm of the main lens (11) normally has the effect of reducing or enlarging the width of the light beams (12), causing the diffraction phenomenon in FIG. 5.
  • each lens (4) in FIG. 5 that is to say the sharpness of the optical selector obtained using the etching process of matrix to be etched, according to the invention, offers in medium (or small) apertures ) of the diaphragm, better tolerance in the face of residual chromatic aberrations on the one hand, and on the other hand, in the face of the diffraction phenomenon.
  • Second improvement relating to the material for engraving the molding matrix making it possible to obtain the optical selector screen.
  • the materials and the materials to be engraved with said materials have evolved and make it possible to produce an engraving in the shape of an elliptical arc.
  • the diamond is, by experience, a material which crumbles after a certain cutting time, in particular at the attack of each edge of the material to be engraved, at the time of the removal of the chips. .
  • the center line (13) of each groove of the optical selector screen (14) thus produced is no more than a few units of microns on the one hand, and on the other hand, provides a perfect secant edge between each groove (6).
  • the etching of the grooves in the matrix is also carried out, in a straight manner, relative to the edges of the material to be etched.
  • the optical selector screen obtained according to the invention thanks to the straightness of each groove (15), allows industrialization and mass production of three-dimensional image copies by lamination by l elimination of the phenomenon of crosslinking and light diffraction.
  • the optical selector thus obtained is, moreover, better suited to the stretching effects of the photographic emulsion.
  • the crosslinking of the photographic emulsion is in fact eliminated.
  • the elimination of this phenomenon has the additional advantage of facilitating the laminating of the photographic emulsion under the optical selector.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

A method for improving the manufacture of a moulding die for making an optical selector screen. A method for etching a material to make the moulding die (1) for moulding an optical selector screen, is disclosed. The geometrical shape of the etched die grooves is that of an arc segment of an ellipse (2) which corresponds to the long axis. According to the optical photographic method, the definition quality of each lens forming the optical selector may be substantially enhanced, and focusing of the photographic image may be improved. The focal length has a greater tolerance and the depth of focus is substantially enhanced. The method further enables improved picture brightness and reduced vignetting. The industrialisation of lamination is performed under optimal conditions for ensuring optical quality. The phenomena of light diffraction and reticulation are eliminated. Said method is particularly suitable for relief or three-dimensional photography.

Description

Procédé pour améliorer la fabrication d'une matrice de moulage d'un écran sélecteur optique et écran ainsi obtenu.Method for improving the manufacture of a molding matrix for an optical selector screen and screen thus obtained.
La présente invention concerne un procédé nouveau pour améliorer la fabrication d'une matrice de moulage d'un sélecteur optique destinée elle-même à mouler un écran sélecteur optique par thermoformage ou par injection et l'écran ainsi obtenu. Ce procédé vise à améliorer considérablement la qualité optique d'un écran sélecteur optique et de plus de permettre une industrialisation plus facile en grande série d'images en relief en trois dimensions.The present invention relates to a new method for improving the manufacture of a mold for molding an optical selector intended itself for molding an optical selector screen by thermoforming or by injection and the screen thus obtained. This process aims to considerably improve the optical quality of an optical selector screen and in addition to allow easier industrialization in large series of three-dimensional relief images.
Ce procédé nouveau s'applique plus particulièrement à la gravure de la matrice . L'objet final de la présente invention est d'améliorer la précision optique et la qualité industrielle du sélecteur optique obtenu par ledit procédé.This new process applies more particularly to the etching of the matrix. The final object of the present invention is to improve the optical precision and the industrial quality of the optical selector obtained by said method.
ART ANTERIEUR ET ETAT DE LA TECHNIQUEPRIOR ART AND STATE OF THE ART
On connaît déjà des moyens de production de sélecteurs optique utilisant le segment de l'arc de cercle comme méthode aléatoire de travail. Cette méthode ne permet pas à chaque lentille convergente de restituer un angle correct de vision.There are already known means for producing optical selectors using the segment of the arc of a circle as a random working method. This method does not allow each converging lens to restore a correct viewing angle.
En effet, la forme géométrique de chaque gorge obtenue par les procédés et moyens connus, ne permet pas de réaliser, par thermoformage ou par injection, des lentilles d'une forme optimale. Or, il est précisément nécessaire d'obtenir cette forme optimale afin d'autoriser,d'une part, une meilleure qualité de restitution du relief des objets à visualiser, et d'autre part une netteté photographique maximale de l'image elle- même. Par ailleurs, la gravure de chaque gorge est , dans les moyens connus, réalisée à l'aide d'un tour. Ce procédé ancien d'obtention d'une gravure en forme hélicoïdale a pour principal inconvénient de graver en biais chaque gorge par rapport au bord droit de l'écran sélecteur optique réalisé ensuite par thermoformage ou par injection.Indeed, the geometric shape of each groove obtained by known methods and means, does not allow to produce, by thermoforming or by injection, lenses of an optimal shape. However, it is precisely necessary to obtain this optimal shape in order to allow, on the one hand, a better quality of restitution of the relief of the objects to be viewed, and on the other hand a maximum photographic clarity of the image itself . Furthermore, the etching of each groove is, in known means, carried out using a lathe. The main drawback of this ancient method of obtaining an engraving in helical form is that it engraves each groove at an angle relative to the right edge of the optical selector screen then produced by thermoforming or by injection.
DESCRIPTION DE L'INVENTIONDESCRIPTION OF THE INVENTION
La présente invention concerne un procédé nouveau de gravure d'une matrice de moulage destinée à obtenir un écran sélecteur optique d'une meilleure performance optique.The present invention relates to a novel method of etching a molding matrix intended to obtain an optical selector screen with better optical performance.
L'optimisation du calcul optique et la nouvelle forme de coupe de la matrice permettent des gains certains en qualité optique ainsi obtenue. Ces gains se rapportent notamment:The optimization of the optical calculation and the new form of cutting the matrix allow certain gains in optical quality thus obtained. These gains relate in particular to:
- à la nette té de l'image.- the sharpness of the image.
- la profondeur de champ obtenue, permet en outre d'augmenter la restitution du relief d'un objet photographié par l'image en relief.- The depth of field obtained, also allows to increase the restitution of the relief of an object photographed by the relief image.
- d'améliorer le contre-collage du sélecteur optique sur l'émulsion photographique lors de 1' industrialisation.- to improve the laminating of the optical selector on the photographic emulsion during industrialization.
Suivant une première caractéristique de l'invention concerne une matrice de moulage (1) destinée à obtenir un écran sélecteur optique pour la visualisation en trois dimensions de photographies, dans cette matrice les gravures de chaque gorge sont obtenues par une nouvelle courbe en forme de d'arc d'ellipse (2) au lieu de l'arc de cercle; la nouvelle courbe de chaque gorge correspond à celle formée par le grand axe de l'ellipse; cette nouvelle courbe est plus aplatie par rapport à l'arc de cercle, le sélecteur optique obtenu est disposé sur une émulsion photographique.According to a first characteristic of the invention relates to a molding matrix (1) intended to obtain an optical selector screen for viewing three-dimensional photographs, in this matrix the engravings of each groove are obtained by a new d-shaped curve 'arc of ellipse (2) instead of the arc of a circle; the new curve of each groove corresponds to that formed by the major axis of the ellipse; this new curve is more flattened compared to the arc of a circle, the optical selector obtained is placed on a photographic emulsion.
Suivant une autre caractéristique de l' invention,1'écran sélecteur optique obtenu avec cette matrice, l'émergence des rayons lumineux (5) au point nodal (6) de l'image formée sur le plan focal est plus large. Cet écran est ensuite disposé sur une émulsion photographique par contre collage.According to another characteristic of the invention, the optical selector screen obtained with this matrix, the emergence of light rays (5) at the nodal point (6) of the image formed on the focal plane is wider. This screen is then placed on a photographic emulsion by laminating.
Les améliorations obtenues sont les suivantes:The improvements obtained are as follows:
Première amélioration résultant de la forme géométrique des gorges de la matrice du nouveau sélecteur optique. Dans les moyens connus la forme géométrique des gorges de la matrice était gravée en forme d'arc de cercle (3) figure 2. Désormais cette gorge est gravée en forme d'arc d'ellipse (2) figure 3. La nouvelle courbe de chaque gorge correspond ainsi à celle formée par le grand axe de 1'ellipse.First improvement resulting from the geometric shape of the grooves in the matrix of the new optical selector. In known means the geometric shape of the grooves of the matrix was engraved in the shape of an arc of a circle (3) figure 2. Now this groove is engraved in the shape of an arc of ellipse (2) figure 3. The new curve of each groove thus corresponds to that formed by the major axis of the ellipse.
Le calcul de la courbe d'ellipse retenu, permet d'aplatir la courbe d'arc de cercle initiale et offre ainsi une ouverture supplémentaire de l'angle de réfraction formé par le passage des ondes électromagnétiques à travers chaque lentille. Ce calcul optique de la courbe d'ellipse permet désormais l'amélioration considérable du rendement optique de chaque lentille convergente (4) . La réfraction du rayon lumineux (5) de chaque lentille ainsi obtenue diverge de quelques degrés supplémentaires par rapport à la direction de l'axe optique figure 3.The calculation of the selected ellipse curve makes it possible to flatten the initial arc curve and thus offers an additional opening of the angle of refraction formed by the passage of electromagnetic waves through each lens. This optical calculation of the ellipse curve now makes it possible to considerably improve the optical efficiency of each converging lens (4). The refraction of the light ray (5) of each lens thus obtained diverges by a few additional degrees relative to the direction of the optical axis in FIG. 3.
Le nouveau sélecteur optique ainsi obtenu par l'amélioration du procédé de gravure, permet une meilleure mise au point de l' image lors de la prise de vue pour la photographie en trois dimensions. L'émergence des rayons lumineux (5) au point nodal (6) de l'image ainsi formée sur le plan focal est plus large figure 3. La distance focale de chaque lentille de chaque lentille par rapport à l'émulsion photographique (7), selon 1'éloignement du sujet, accepte ainsi une meilleure tolérance.The new optical selector thus obtained by the improvement of the engraving process, allows a better focusing of the image when shooting for three-dimensional photography. The emergence of light rays (5) at the nodal point (6) of the image thus formed on the focal plane is wider in FIG. 3. The focal distance of each lens of each lens relative to the photographic emulsion (7) , depending on the distance from the subject, thus accepts better tolerance.
Suivant une autre caractéristique , dans l'écran sélecteur optique obtenu selon l'invention ,1e cône formé (8) lors de la réfraction de la lumière dans chaque lentille (4) permet d'aller en effet plus au-delà et en deçà du point lumineux (9) formé sur l'émulsion photographique (7) sur laquelle il est disposé. Les faisceaux lumineux de l'écran, impriment une plus grande surface (10) de l'émulsion photographique (7) sur lequel il est disposé, offrant ainsi une meilleure résolution et réduisant le phénomène de vignettage.According to another characteristic, in the optical selector screen obtained according to the invention, the first cone formed (8) during the refraction of the light in each lens (4) makes it possible to go in fact more beyond and below the light point (9) formed on the photographic emulsion (7) on which it is arranged. The light beams of the screen print a larger surface (10) of the photographic emulsion (7) on which it is arranged, thus offering better resolution and reducing the phenomenon of vignetting.
Ce nouveau procédé de gravure permet encore de réaliser une meilleure profondeur du foyer de chaque lentille, et de ce fait d'obtenir une image valablement précise, ce qui n'était pas le cas avec les procédés connus.This new etching process also makes it possible to achieve a better depth of the focal point of each lens, and therefore to obtain a validly precise image, which was not the case with the known processes.
Suivant l'invention, la netteté de l'image formée sur 1'émulsion photographique est obtenue grâce à une meilleure latitude de réglage de la distance de la profondeur du foyer de chaque lentille. Le cône formé (8) lors de la réfraction de la lumière dans chaque lentilleAccording to the invention, the sharpness of the image formed on the photographic emulsion is obtained by virtue of a better latitude for adjusting the distance from the depth of the focal point of each lens. The cone formed (8) when the light is refracted in each lens
(4) permet d'aller en effet plus au-delà et en deçà du point lumineux (9) formé sur l'émulsion photographique(4) makes it possible to go further beyond and below the light point (9) formed on the photographic emulsion
(7) figure 4. La gravure de chaque gorge obtenue selon ce nouveau calcul et ce nouveau procédé permet un gain considérable de la qualité de netteté optique de chaque lentille composant le sélecteur optique. Le dit procédé permet ainsi, de mieux restituer le relief des objets en les projetant encore plus hors de l'image en avant de la photographie.(7) figure 4. The etching of each groove obtained according to this new calculation and this new process allows a considerable gain in the quality of optical clarity of each lens making up the optical selector. The said process thus makes it possible to better restore the relief of the objects by projecting them even more out of the image in front of the photograph.
Les faisceaux lumineux lors de leur passage dans chaque lentille viennent de plus imprimer une plus grande surface (10) de l'émulsion photographique (7) placée sous le sélecteur optique. Cela a notamment l'avantage d'augmenter le nombre de points par cm2 insolés de la surface photosensible de l'émulsion photographique. Les faisceaux lumineux (5) sont en effet plus étendus sur la surface photosensible de l'émulsion photographique et offrent une meilleure luminosité de l'image figue 4.The light beams when they pass through each lens also print a larger surface (10) of the photographic emulsion (7) placed under the optical selector. This has the particular advantage of increasing the number of points per cm 2 exposed from the photosensitive surface of the photographic emulsion. The light beams (5) are in fact more extensive on the photosensitive surface of the photographic emulsion and offer better brightness of the fig image 4.
Par ailleurs, ce nouveau procédé de gravure permet de réduire le phénomène de vignettage du sélecteur optique. La fermeture ou l'ouverture du diaphragme de l'objectif principal (11) a normalement pour effet de réduire ou d'agrandir la largeur des faisceaux lumineux (12), entraînant le phénomène de diffraction figure 5.Furthermore, this new etching process makes it possible to reduce the vignetting phenomenon of the optical selector. Closing or opening the diaphragm of the main lens (11) normally has the effect of reducing or enlarging the width of the light beams (12), causing the diffraction phenomenon in FIG. 5.
Le pouvoir résolvant de chaque lentille (4) figure 5, c'est à dire la netteté du sélecteur optique obtenu à l'aide du procédé de gravure de matrice à graver, conforme à l'invention, offre dans les ouvertures moyennes ( ou petites ) du diaphragme, une meilleure tolérance face aux aberrations chromatiques résiduelles d'une part, et d'autre part, face au phénomène de diffraction.The resolving power of each lens (4) in FIG. 5, that is to say the sharpness of the optical selector obtained using the etching process of matrix to be etched, according to the invention, offers in medium (or small) apertures ) of the diaphragm, better tolerance in the face of residual chromatic aberrations on the one hand, and on the other hand, in the face of the diffraction phenomenon.
Deuxième amélioration relative au matériel pour graver la matrice de moulage permettant d'obtenir l'écran sélecteur optique.Second improvement relating to the material for engraving the molding matrix making it possible to obtain the optical selector screen.
De nos jours, les matériaux et les matériels à graver lesdits matériaux ont évolués et permettent de réaliser une gravure en forme d'arc d'ellipse. Ainsi, il est reconnu que le diamant est, par expérience, un matériau qui s'effrite au bout d'un certain temps de coupe, notamment à l'attaque de chaque bord du matériau à graver, au moment de l'enlèvement des copeaux.Nowadays, the materials and the materials to be engraved with said materials have evolved and make it possible to produce an engraving in the shape of an elliptical arc. Thus, it is recognized that the diamond is, by experience, a material which crumbles after a certain cutting time, in particular at the attack of each edge of the material to be engraved, at the time of the removal of the chips. .
Il est de plus en plus possible de graver le matériau à l'aide outillages autres qu'un tour à graver et dans des matériaux autre que le cuivre.It is more and more possible to engrave the material using tools other than an engraving lathe and in materials other than copper.
Il est en effet possible aujourd'hui de procéder à la gravure de la matrice de moulage avec un matériau et des outils à graver tous deux plus adaptés, lors de l'enlèvement de copeaux, pour obtenir une meilleure forme de coupe.It is indeed possible today to carry out the etching of the molding die with a material and both engraving tools more suitable, when removing chips, to obtain a better cutting shape.
A l'aide du procédé suivant l'invention, l'entre axe (13) de chaque gorge de l'écran sélecteur optique (14) ainsi réalisé n'est plus que de quelques unités de microns d'une part, et d'autre part, permet d'obtenir un bord sécant parfait entre chaque gorge (6) . La gravure des gorges de la matrice s'effectue de plus , d'une manière droite, par rapport au bords du matériau à graver.Using the method according to the invention, the center line (13) of each groove of the optical selector screen (14) thus produced is no more than a few units of microns on the one hand, and on the other hand, provides a perfect secant edge between each groove (6). The etching of the grooves in the matrix is also carried out, in a straight manner, relative to the edges of the material to be etched.
Suivant une dernière caractéristique,1'écran sélecteur optique obtenu selon l'invention, grâce à la rectitude de chaque gorge (15) permet l'industrialisation et la fabrication en grande série d'exemplaires d'image en trois dimensions par contre collage par l'élimination du phénomène de réticulation et de diffraction de la lumière.According to a last characteristic, the optical selector screen obtained according to the invention, thanks to the straightness of each groove (15), allows industrialization and mass production of three-dimensional image copies by lamination by l elimination of the phenomenon of crosslinking and light diffraction.
Cela autorise une industrialisation plus aisée de la fabrication du sélecteur optique et par conséquent de l'image en trois dimensions, la rectitude de chaque gorge (15) par rapport à l'émulsion photographique insolée (7) permet en effet d'effectuer les opérations de contre- collage, dans les meilleures conditions de qualité optique figure 6.This allows an easier industrialization of the manufacturing of the optical selector and consequently of the three-dimensional image, the straightness of each groove (15) relative to the exposed photographic emulsion (7) indeed makes it possible to carry out the operations. laminating, in the best optical quality conditions Figure 6.
Le sélecteur optique ainsi obtenu est, de plus, mieux adapté aux effets d'étirement de l'émulsion photographique. La réticulation de l'émulsion photographique est en effet supprimée. La suppression de ce phénomène a pour avantage supplémentaire de faciliter le contre-collage de l'émulsion photographique sous le sélecteur optique. The optical selector thus obtained is, moreover, better suited to the stretching effects of the photographic emulsion. The crosslinking of the photographic emulsion is in fact eliminated. The elimination of this phenomenon has the additional advantage of facilitating the laminating of the photographic emulsion under the optical selector.

Claims

REVENDICATIONS
1 Matrice de moulage (1) destinée à obtenir un écran sélecteur optique pour la visualisation en trois dimensions de photographies, caractérisé en ce que les gravures de chaque gorge sont obtenues par une nouvelle courbe en forme de d'arc d'ellipse (2) au lieu de l'arc de cercle; la nouvelle courbe de chaque gorge correspond à celle formée par le grand axe de l'ellipse; cette nouvelle courbe est plus aplatie par rapport à l'arc de cercle, le sélecteur optique obtenu est disposé sur une émulsion photographique.1 molding die (1) intended to obtain an optical selector screen for viewing three-dimensional photographs, characterized in that the engravings of each groove are obtained by a new curve in the form of an arc of an ellipse (2) instead of the arc of a circle; the new curve of each groove corresponds to that formed by the major axis of the ellipse; this new curve is more flattened compared to the arc of a circle, the optical selector obtained is placed on a photographic emulsion.
2 Ecran sélecteur optique obtenu avec la matrice selon la revendication 1, caractérisé en ce que l'émergence des rayons lumineux (5) au point nodal (6) de l'image formée sur le plan focal est plus large et en ce qu'il est disposé sur l'émulsion photographique par contre collage.2 optical selector screen obtained with the matrix according to claim 1, characterized in that the emergence of light rays (5) at the nodal point (6) of the image formed on the focal plane is wider and in that it is placed on the photographic emulsion by bonding.
3 Ecran sélecteur optique obtenu selon l'une quelconque des revendications de 1 à 2, caractérisé en ce que le cône formé (8) lors de la réfraction de la lumière dans chaque lentille (4) permet d'aller en effet plus au-delà et en deçà du point lumineux (9) formé sur l'émulsion photographique (7) sur laquelle il est disposé.3 optical selector screen obtained according to any one of claims 1 to 2, characterized in that the cone formed (8) during the refraction of the light in each lens (4) makes it possible to go further beyond and below the light point (9) formed on the photographic emulsion (7) on which it is arranged.
4 Ecran sélecteur otique obtenu selon l'une quelconque des revendications de 1 à 3, caractérisé en ce que les faisceaux lumineux impriment une plus grande surface (10) de l'émulsion photographique (7) sur lequel il est disposé, offrent ainsi une meilleure résolution et en ce qu'il réduit le phénomène de vignettage.4 otic selector screen obtained according to any one of claims 1 to 3, characterized in that the light beams print a larger surface (10) of the photographic emulsion (7) on which it is arranged, thus offer better resolution and in that it reduces the vignetting phenomenon.
5 Ecran sélecteur optique obtenu selon l'une quelconque des revendications de 1 à 4, caractérisé en ce que la rectitude de chaque gorge (15) permet l'industrialisation et la fabrication en grande série d'exemplaires d'image en trois dimensions par contre collage par l'élimination du phénomène de réticulation et de diffraction de la lumière. 5 Optical selector screen obtained according to any one of claims 1 to 4, characterized in that the straightness of each groove (15) allows industrialization and mass production of three-dimensional image copies on the other hand bonding by eliminating the phenomenon of crosslinking and diffraction of light.
PCT/FR1996/000139 1995-01-30 1996-01-26 Method for improving the manufacture of an optical selector screen moulding die, and resulting screen WO1996024087A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9501009A FR2730067B1 (en) 1995-01-30 1995-01-30 METHOD FOR IMPROVING THE MANUFACTURE OF THE MOLDING DIE TO OBTAIN AN OPTICAL SELECTOR SCREEN
FR95/01009 1995-01-30

Publications (1)

Publication Number Publication Date
WO1996024087A1 true WO1996024087A1 (en) 1996-08-08

Family

ID=9475609

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1996/000139 WO1996024087A1 (en) 1995-01-30 1996-01-26 Method for improving the manufacture of an optical selector screen moulding die, and resulting screen

Country Status (2)

Country Link
FR (1) FR2730067B1 (en)
WO (1) WO1996024087A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594457A (en) * 1967-06-12 1971-07-20 Polaroid Corp Method of press forming birefringent transparent polyethylene terephthalate sheets
US5300263A (en) * 1992-10-28 1994-04-05 Minnesota Mining And Manufacturing Company Method of making a microlens array and mold
JPH06201904A (en) * 1992-12-25 1994-07-22 Dainippon Printing Co Ltd Lenticular lens, surface light source and liquid crystal display device
JPH06214308A (en) * 1993-01-14 1994-08-05 Kuraray Co Ltd Screen, transfer roller and production of screen
JPH06301035A (en) * 1993-04-16 1994-10-28 Dainippon Printing Co Ltd Plane light source, display device using the same and lens sheet used for the same
JPH075463A (en) * 1993-06-16 1995-01-10 Dainippon Printing Co Ltd Surface light source and display device using the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594457A (en) * 1967-06-12 1971-07-20 Polaroid Corp Method of press forming birefringent transparent polyethylene terephthalate sheets
US5300263A (en) * 1992-10-28 1994-04-05 Minnesota Mining And Manufacturing Company Method of making a microlens array and mold
JPH06201904A (en) * 1992-12-25 1994-07-22 Dainippon Printing Co Ltd Lenticular lens, surface light source and liquid crystal display device
JPH06214308A (en) * 1993-01-14 1994-08-05 Kuraray Co Ltd Screen, transfer roller and production of screen
JPH06301035A (en) * 1993-04-16 1994-10-28 Dainippon Printing Co Ltd Plane light source, display device using the same and lens sheet used for the same
JPH075463A (en) * 1993-06-16 1995-01-10 Dainippon Printing Co Ltd Surface light source and display device using the same

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 557 (P - 1817) 24 October 1994 (1994-10-24) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 581 (P - 1822) 7 November 1994 (1994-11-07) *
PATENT ABSTRACTS OF JAPAN vol. 940, no. 010 *
PATENT ABSTRACTS OF JAPAN vol. 950, no. 001 *

Also Published As

Publication number Publication date
FR2730067A1 (en) 1996-08-02
FR2730067B1 (en) 1997-07-11

Similar Documents

Publication Publication Date Title
EP1386480B1 (en) Method for capturing and displaying a variable-resolution digital panoramic image
WO2003007592A1 (en) Method and system for correcting chromatic aberrations of a colour image produced by an optical system
EP1856907A2 (en) Method of controlling an action, such as a sharpness modification, using a colour digital image
EP3160719B1 (en) Three-dimensional printing device
CH616513A5 (en)
GB2184259A (en) Increasing the depth of field of a 3-d photograph
CN107578420A (en) A kind of adaptive striation carrying out image threshold segmentation method
CN107424195A (en) A kind of light field method for estimating distance
WO2020161205A1 (en) Assembly consisting of a two-dimensional network of micro-optical devices and a network of micro-images, method for manufacturing same, and security document comprising same
WO1996024087A1 (en) Method for improving the manufacture of an optical selector screen moulding die, and resulting screen
FR2763666A1 (en) MOTOR VEHICLE PROJECTOR WITH WIDE BEAM GENERATOR AND WINDOW GLASS
FR2771516A1 (en) Masking amount guide device for stereo slides
FR2638541A1 (en) MONO-OBJECTIVE VIEWING APPARATUS WITH REFLEX VIEW
TWI761128B (en) Dual lens imaging module and capturing method thereof
FR3046112B1 (en) METHOD FOR MAKING SELECTIVELY VISIBLE IMAGES BY VARYING THE ENGRAVING OBSERVATION ANGLE THROUGH A LENTICULAR NETWORK
FR2880958A1 (en) Digital image`s color sharpness improving method for e.g. digital photo apparatus, involves choosing bold color among colors, and reflecting sharpness of bold color on another improved color
JPH08190135A (en) Metal mold for focal plate and focal plate
Tsuruyama et al. Multi-Mirror Array Optics for Augmented Reality Devices and Optical Distortion Correction
BE548407A (en)
EP4170426A1 (en) Display with retroreflective microstructures
BE522905A (en)
BE382042A (en)
FR2965643A1 (en) HOLOGRAPHIC METHOD OF RECORDING IN A SINGLE STEP USING AN AFOCAL SYSTEM
BE415113A (en)
FR2677581A1 (en) Silk screen printing anaglyphs

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN FI JP KR LK MK MX NZ SG US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase