EP0000570B1 - Original d'un porteur d'informations optique et procédé pour la réalisation de l'original - Google Patents

Original d'un porteur d'informations optique et procédé pour la réalisation de l'original Download PDF

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Publication number
EP0000570B1
EP0000570B1 EP78100480A EP78100480A EP0000570B1 EP 0000570 B1 EP0000570 B1 EP 0000570B1 EP 78100480 A EP78100480 A EP 78100480A EP 78100480 A EP78100480 A EP 78100480A EP 0000570 B1 EP0000570 B1 EP 0000570B1
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EP
European Patent Office
Prior art keywords
images
relief
grid
original
color
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
EP78100480A
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German (de)
English (en)
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EP0000570A1 (fr
Inventor
Roland Dr. Moraw
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Hoechst AG
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Hoechst AG
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Publication date
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Publication of EP0000570A1 publication Critical patent/EP0000570A1/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
    • G03F7/001—Phase modulating patterns, e.g. refractive index patterns
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C9/00—Stereo-photographic or similar processes

Definitions

  • the invention relates to an original of an optical information carrier, consisting of a recording layer applied to a carrier material, which has a relief image containing information that can be reproduced by the method for relief grating image reproduction in the zeroth diffraction order, which is composed of a plurality of relief partial images arranged in the free surface of the recording layer , which consist of relief grids with different grating depths, and a method for producing an original.
  • a nickel matrix with different relief depth is created separately, with which the separate embossed images are created.
  • the relief depths are different, with the relief depth being greatest for the cyan extract and smallest for the yellow extract.
  • These color separation images are rasterized.
  • the embossed images are overlaid on a three-layer relief image from which colored images can be projected. The technique described produces very bright, high resolution color images. The relief images can be reproduced relatively cheaply and quickly by embossing.
  • a disadvantage that complicates the introduction of this technique is the complex manufacturing process with three completely separate work steps for producing the individual embossed relief images corresponding to the color separations.
  • Another disadvantage is the fitting of the three separate embossed copies, each of which contains a relief partial image, to the duplicate image required for the color projection.
  • the original of an information carrier described at the beginning is known from the document DE-A-27 03 160, this original consisting of a carrier material on which a recording layer is applied.
  • the latter contains a relief image representing the information.
  • the relief image is composed of two relief partial images in the free surface of the layer, which consist of two superimposed diffraction gratings, each with a different depth. These diffraction gratings have a mutual angular displacement of 60 ° or 90 ° or any other value.
  • GB-A 6 825 describes a method in which the colored projection image is generated by imaging the diffracted light, for which purpose the color separation images are modulated with gratings of different grating constants in accordance with the color separations.
  • An attempt is made to store the different grid images in one layer by superimposing two grids of very different grid constants.
  • a relatively coarse grating is superimposed on the actual color-determining grids with different grating constants in the color separation exposure, which is also shifted into new positions with each exposure, the distance between the individual positions being smaller than the grating constant of the coarse grating.
  • Such a double-grid technique with partial displacement of a grid is very difficult to use.
  • Relief grids with uniform grating constants and a rectangular grid profile are not used, and the undiffracted light is not used for the projection.
  • Such an imaging technique does not lead to an exact color-accurate projection of the relief grid images.
  • the relief image is then composed of the relief partial images corresponding to the individual color separations in such a way that differently colored areas, which in the case of rasterized images can also be halftone dots, are arranged in one plane, the differently colored areas not overlapping but at most touching.
  • Relief images of this type are very well suited for displaying flat, multicolored templates, such as graphic representations, in the form of relief grid structures in one plane.
  • German patent 26 57 246 works with three basic colors, which are generally not sufficient for the presentation of colorful templates with mixed colors, for example of colorful landscape images, in a similar manner to a template.
  • the object of the invention is to provide an original of an information carrier which is suitable for the reproduction of any, complete color images, including mixed colors.
  • This object is achieved according to the invention in that at least four relief partial images are present, the relief partial images adjoin one another without overlap, and the grating depths of the relief partial images are selected such that when projected with white light, the zeroth diffraction order is yellow, red , blue-violet and green.
  • the advantage is achieved that by exposing the recording layer with the color separation templates of a color system of, for example, four primary colors, namely blue-violet, green, yellow and red, the exposure through a grid and the development of the recording layer an existing from a relief image Original is obtained, from which, as a result of the lattice structures located in a single plane, a copy can be made with a single embossing, which when projected results in these four basic colors and all the mixed colors which can be obtained from them by nesting for a complete color image.
  • a color separation templates of a color system of, for example, four primary colors, namely blue-violet, green, yellow and red the exposure through a grid and the development of the recording layer an existing from a relief image Original is obtained, from which, as a result of the lattice structures located in a single plane, a copy can be made with a single embossing, which when projected results in these four basic colors and all the mixed colors which can be obtained from them by nesting for
  • the also known additive process is based on the basic colors blue-violet (6), green (4) and red (5).
  • Yellow (1) is formed, for example, from green (4) and red (5) light. Accordingly, cyan (2) and magenta (3) are formed.
  • a picture element for example a halftone dot, consists of a green (4), red (5) and violet color filter area (6), as shown in FIG. 2.
  • the color filter areas are arranged next to one another in one plane without overlaps. If all three color filter areas are irradiated, the halftone dot appears white; if only one or two color filter areas are irradiated, the projected halftone dot is colored in accordance with one or the two irradiated color filter areas.
  • the undesired proportion of color can be eliminated by covering the relevant color filter area, for example by developing silver grains in a photographic layer. It is obvious that the brightness of projected color images by the additive technique is not as great as that of color images by the subtractive technique, since in the first case only one or two partial areas are used to produce a color of the halftone dot are irradiated, while in the second case all three partial areas are irradiated.
  • Another disadvantage of the additive technology described is the subdivision of the picture elements, usually the halftone dots, into smaller areas, because this increases the requirements with regard to the positioning accuracy for color separation templates when exposing the photoresist layer through different color separation templates.
  • the color system according to the invention produces projection images that are as bright as the subtractive color system and avoids the difficulties with regard to the positioning accuracy of the embossed copies, as they occur with the subtractive method.
  • the latter is a consequence of the complete image storage in the form of relief grid structures in the surface of a single layer.
  • the primary colors are blue-violet (430-480 nm), green (510-540 nm), yellow (570 ⁇ 600 nm) and red (610-650 nm). These four primary colors cover the visible spectral range in such a way that the gaps between the individual primary color ranges are much smaller than with only three primary colors.
  • the color image to be reproduced can be rasterized, i.e. the image area should be broken down into small parts.
  • Each halftone dot that is not black or white contains only one of the four basic colors.
  • Mixed colors are formed by nesting differently colored halftone dots, whereby the halftone dots of one color can also have different intensities. This is shown schematically in FIG. 3, in which, in addition to the four primary colors, the mixed colors cyan (2), yellow-green (8), magenta (3) and orange (9) can be seen.
  • White halftone dots (10) remain transparent, black halftone dots (11) are as little translucent as possible.
  • the respective color intensity is determined by the color-generating area portion 12 of the respective raster point 13.
  • the color-generating area portion 12 of the halftone dots 13 can be formed in all gradations between full color coverage with 100% coverage of homogeneous color and a lack of color coverage.
  • Colorful images are reproduced with the help of four partial images, the basic colors blue-violet / green / yellow / red, with corresponding grid structures in one plane, by projection via an imaging optics.
  • the grid structures can be designed as grid points for color matching.
  • This reproduction technique can also be used for images using rastered optics such as a lattice grid made of cylindrical lenses or a cross louvre made of spherical lenses, for which a raster-like image decomposition is also required.
  • the grating constant for the relief grating should be selected so that the light deflected in the first diffraction order falls on the intermediate lens regions of the lenticular screen.
  • the number of basic colors can be expanded beyond four. In most cases, the color rendering with four primary colors is quite satisfactory.
  • White image areas are formed at grid-free image areas or at image areas with structures that only have a relatively small diffraction effect.
  • the color black which in practice is often approximated by deep dark brown or deep dark violet, is based on strongly structured image areas that do not show a pronounced color effect. For example, in the case of relief gratings in photoresists with a rectangular cross section, very dark brown tones or blue tones occur at grating depths between 0.5 ⁇ m and about 1 ⁇ m.
  • a nickel matrix is removed from the relief structures in the photoresist layer of the original, with which a thermoplastic film made of, for example, polyvinyl chloride is embossed. If the refractive index of the photoresist layer and the refractive index of the thermoplastic film are the same, for example 1.5, no color distortion occurs on the embossed images. If there are differences in the refractive indices, the relief depth in the photoresist layer must be set so that the embossed image correctly reproduces the desired projection colors. A measure of the depth adjustment is the optical path length difference d given by the grating depth.
  • the four basic colors blue-violet, green, yellow and red with optical path length differences of approximately 0.3 / 1.2 / 0.6 / 0.8 ⁇ m are obtained, this corresponds to arithmetic relief depths in the photoresist between approximately 0.6, ⁇ m and 2.4 ⁇ m.
  • a value of 2.1 ⁇ m was measured for an optical path length of 1.2 ⁇ m, deviating from the calculated value of 2.4 ⁇ m.
  • Suitable methods for creating relief images are specified in German Patent 26 57 246.
  • a photoresist layer on a glass or film carrier is exposed by color separation templates, in the sense of the present invention by one each for blue-violet, green, yellow and red, in such a way that relief structures of the desired grid depth have arisen at the relevant image points after development.
  • White areas of the image are formed by overexposure or underexposure.
  • Black areas of the image are exposed by means of suitable templates for generating the projection light as possible panchromatic distracting structures. Care must be taken to ensure that the color separation templates are placed on the photoresist layer in a suitable manner, particularly with rastered images.
  • conventional 120 rasters 120 raster periods / cm
  • finer rasters up to halftone dots of 10 ⁇ m in diameter
  • the color separation templates used are designed in such a way that they are only transparent at the locations to be imaged.
  • the variant is possible that at least two or more originals are transparent at these locations, since the double exposure through these locations results in such an intensive exposure that the photoresist layer is exposed.
  • the grid-like exposure in particular the contact between the photoresist layer and the grid template, requires great care.
  • the exposure is preferably carried out in a spindle press, shown schematically in FIG. 5, from an angular frame 14 with a light entry opening 15 and a spindle 16.
  • An arched spindle head 17 carries an elastic layer 18, which the recording material from a carrier 19 and a photoresist layer 20 against the Lattice template 21 presses.
  • photoresists For the original production, about 2.5 ⁇ m thick layers of photoresist are assumed, which are exposed imagewise and lattice-wise.
  • the imagewise exposure is preferably carried out in contact with the respective color separation template, the lattice-like exposure in contact with a lattice template, for example a glass plate with translucent areas and with areas opaque covered by metal webs.
  • the original is coated with a thin electrically conductive layer on which a metal coating is deposited. Then the original and the metal coating, whose contact surface with the original represents the negative relief image of the original, are separated from one another.
  • a deformable material from which the information carrier is produced for example polyvinyl chloride, is embossed with the metal die produced in this way in a manner known per se under pressure and under mostly temperature-induced viscosity reduction.
  • An approximately 2.5 ⁇ m thick layer of positive-working photoresist is applied to a bare transparent polyester film by spinning and drying. This layer is then brought under pressure into contact with a grid of 600 lines / mm made of metal bars on a glass plate and irradiated with actinic light with an energy density of 280 mWs / cm 2 . This energy density is required for the grid-shaped exposure of the photoresist layer up to the polyester carrier.
  • the first order of colors is due to increasing grating depths in the recording layer, while the reversal of the color sequence is the result of decreasing grating depths due to overexposure of the layer.
  • the photoresist layer can also be developed more and more on the grid bars.
  • the various color separation templates are placed one after the other with a grid pattern corresponding to a 120 grid in contact arrangement, and the exposure time is different, depending on the desired projection color.
  • the color separation templates are only transparent at the locations of the desired projection colors and at the white image areas.
  • the registration of the color separation templates on the recording layer is done with the help of register crosses with yellow security light under a microscope.
  • the black separation template contains a grid pattern of approx.
  • the energy densities for the exposure through the color separation templates were set at 105/125/140/205 mWs / cm 2 .
  • the developed relief image was then vapor-deposited with a thin copper layer on which nickel was electroplated.
  • a polyvinyl chloride film was embossed in a press at approx. 130 ° C using the nickel die produced.
  • the relief image created in the polyvinyl chloride film by a single embossing resulted in a color image when projected in the undeflected beam path, which largely resembled the projection image from the original relief image.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Holo Graphy (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Claims (10)

1. Original d'un support d'information optique comprenant une couche d'enregistrement appliquée sur une matière de support, dans laquelle il se trouve une image en relief contenant une information pouvant être reproduite selon un procédé pour la reproduction d'images en réseaux en relief dans l'ordre de diffraction zéro, cette image en relief étant composée de plusieurs images partielles en relief, disposées à la surface libre de la couche d'enregistrement, ces images partielles étant composées de grilles en relief, ayant des profondeurs de relief différentes, caractérisé en ce que:
a) il y a au moins quatre images partielles en relief,
b) les images partielles en relief s'avoisinent sans superposition et,
c) les profondeurs de grille des images partielles en relief sont choisies de telle façon qu'à la projection avec de la lumière blanche, l'ordre de diffraction zéro comprend les couleurs jaune, rouge, bleu-violet et vert.
2. Original selon la revendication 1, caractérisé en ce que d'autres images partielles en relief (2, 3, 8, 9) sont prévues dont les profondeurs de grille donnent les couleurs de projection bleu, magenta, jaune-vert et orange.
3. Original selon la revendication 1 ou 2, caractérisé en ce qu'il contient en dehors des images partielles en relief (1 à 6, 8, 9) des zones transparentes (10), séparées dans l'espace sans structures à réseaux.
4. Original selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comprend additionnellement aux images partielles en relief (1 à 6, 8, 9), ayant des profondeurs de grille correspondant aux structures de réseaux souhaitées, des images partielles en relief (11), ayant des structures à réseaux rectangulaires qui affaiblissent l'intensité de la lumière de projection sur toute l'étendue du domaine spectral visible.
5. Original selon la revendication 1, caractérisé en ce que chacune des images partielles en relief (1, 4, 5, 6) est composée des points de trame appartenant à une couleur fondamentale.
6. Original selon la revendication 5, caractérisé en ce que les points de trame appartenant à chacune des couleurs fondamentales sont disposés côte à côte et sans superposition et sont intercalés.
7. Original selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les images partielles en relief (1 à 6, 8, 9) possèdent des profondeurs de relief qui provoquent des différences entre les parcours optiques comprises entre 0,3 ,um et 1,3 ,um.
8. Procédé pour la fabrication d'un original selon la revendication 1 dans lequel on expose la couche d'enregistrement selon une information, à travers des modèles de sélection colorée, qui sont transparents dans les domaines de la couleur de projection de chaque modèle de sélection colorée, caractérisé en ce que:
a) on expose d'abord toute la surface de la couche d'enregistrement de façon uniforme avec un échantillon de grille,
b) ensuite, on expose selon une information à travers des modèles de sélection colorée pour le bleu-violet, le vert, le jaune et le rouge, en joignant les images partielles en relief sans superposition et,
c) on développe la couche d'enregistrement.
9. Procédé selon la revendication 8, caractérisé en ce que l'exposition à la lumière de la couche d'enregistrement à travers un modèle de sélection pour le noir et en ce qu'il se crée pendant cette exposition des structures en relief en forme de grille, qui affaiblissent la lumière de projection blanche de façon panchromatique.
10. Procédé selon la revendication 8 ou 9, caractérisé en ce que l'exposition sous une grille s'effectue en pressant la couche d'enregistrement contre un modèle à réseaux.
EP78100480A 1977-08-01 1978-07-24 Original d'un porteur d'informations optique et procédé pour la réalisation de l'original Expired EP0000570B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2734581A DE2734581C2 (de) 1977-08-01 1977-08-01 Original eines Informationsträgers und Verfahren zum Herstellen des Originals
DE2734581 1977-08-01

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EP0000570A1 EP0000570A1 (fr) 1979-02-07
EP0000570B1 true EP0000570B1 (fr) 1981-01-14

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EP78100480A Expired EP0000570B1 (fr) 1977-08-01 1978-07-24 Original d'un porteur d'informations optique et procédé pour la réalisation de l'original

Country Status (7)

Country Link
US (1) US4269915A (fr)
EP (1) EP0000570B1 (fr)
JP (1) JPS5436956A (fr)
AT (1) AT373698B (fr)
CA (1) CA1109313A (fr)
DE (2) DE2734581C2 (fr)
IT (1) IT7850547A0 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2826380A1 (de) * 1978-06-16 1980-01-03 Hoechst Ag Farbauszugstransparent und verfahren zu seiner herstellung
DE2853953A1 (de) * 1978-12-14 1980-07-03 Hoechst Ag Identifikationskarte
US4737448A (en) * 1986-03-31 1988-04-12 Xerox Corporation Color images formed by multiple diffraction gratings
US5264880A (en) * 1991-12-30 1993-11-23 Xerox Corporation Method and apparatus for projecting a color image
US5217832A (en) * 1992-01-23 1993-06-08 The Walt Disney Company Permanent color transparencies on single substrates and methods for making the same
US5503902A (en) * 1994-03-02 1996-04-02 Applied Physics Research, L.P. Light control material

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE140907C (fr) * 1899-03-07 1903-05-11
GB189911466A (en) * 1899-06-02 1900-04-28 Thomas Thorp Improvements in the Method of and Means for Rendering Photographic and other Pictures of Objects Visible in their Natural or in other Desired Colours.
GB190606825A (en) * 1905-10-19 1906-09-27 Herbert Eugene Ives Improvements in Diffraction Colour Photographs and Mode of Making same
US2875047A (en) * 1955-01-19 1959-02-24 Oster Gerald Photopolymerization with the formation of coherent plastic masses
US4006018A (en) * 1968-05-10 1977-02-01 Minnesota Mining And Manufacturing Company Copying in color
US3672894A (en) * 1970-04-27 1972-06-27 Gen Electric Method for making a composite back projection screen
US3834801A (en) * 1970-09-21 1974-09-10 Staley Mfg Co A E Reflective elements
US3743507A (en) * 1970-10-23 1973-07-03 Rca Corp Recording of a continuous tone focused image on a diffraction grating
US3763296A (en) * 1971-03-05 1973-10-02 American Charts Co Method for making colored
US3732363A (en) * 1971-08-16 1973-05-08 Columbia Broadcasting Syst Inc Information record utilizing diffraction grating and methods of recording and reproducing the information thereof
US3947105A (en) * 1973-09-21 1976-03-30 Technical Operations, Incorporated Production of colored designs
US3993489A (en) * 1973-11-14 1976-11-23 Monsanto Company Multi-color laminate of photopolymer that is image-wise hydroperoxidized
US3957354A (en) * 1975-02-03 1976-05-18 Rca Corporation Diffractive subtractive color filtering technique
US4017158A (en) * 1975-03-17 1977-04-12 E. I. Du Pont De Nemours And Company Spatial frequency carrier and process of preparing same
GB1538342A (en) * 1976-01-19 1979-01-17 Rca Corp Structure and recording for diffractive relief images for zero-order read-out in black-and-white
GB1537703A (en) * 1976-01-27 1979-01-04 Rca Corp Fabrication of rectangular relief profiles in photoresist
DE2657246C2 (de) * 1976-12-17 1978-09-28 Hoechst Ag, 6000 Frankfurt Original eines Informationsträgers, Verfahren zum Herstellen des Originals, Verfahren zum Herstellen einer Matrize zum Prägen des Originals sowie Informa tionsträger, der mit der Matrize hergestellt ist

Also Published As

Publication number Publication date
DE2734581C2 (de) 1979-02-15
AT373698B (de) 1984-02-10
DE2734581B1 (de) 1978-06-01
ATA554578A (de) 1983-06-15
IT7850547A0 (it) 1978-07-31
CA1109313A (fr) 1981-09-22
JPS5436956A (en) 1979-03-19
EP0000570A1 (fr) 1979-02-07
DE2860324D1 (en) 1981-03-12
US4269915A (en) 1981-05-26

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