EP0695440A1 - Hologrammes - Google Patents

Hologrammes

Info

Publication number
EP0695440A1
EP0695440A1 EP94913170A EP94913170A EP0695440A1 EP 0695440 A1 EP0695440 A1 EP 0695440A1 EP 94913170 A EP94913170 A EP 94913170A EP 94913170 A EP94913170 A EP 94913170A EP 0695440 A1 EP0695440 A1 EP 0695440A1
Authority
EP
European Patent Office
Prior art keywords
hologram
holograms
word
image
array
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.)
Withdrawn
Application number
EP94913170A
Other languages
German (de)
English (en)
Inventor
Graham Dundas Richmond Tunnadine
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0695440A1 publication Critical patent/EP0695440A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/30—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique discrete holograms only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0236—Form or shape of the hologram when not registered to the substrate, e.g. trimming the hologram to alphanumerical shape
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H2001/2236—Details of the viewing window
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2249—Holobject properties
    • G03H2001/2273—Pseudo-dynamic holobject, e.g. due to angle multiplexing and viewer motion
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/268—Holographic stereogram
    • G03H2001/269—Two and more than two steps recording process
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/30—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique discrete holograms only
    • G03H2001/306—Tiled identical sub-holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2210/00—Object characteristics
    • G03H2210/50—Nature of the object
    • G03H2210/52—Alphanumerical

Definitions

  • the present invention relates to holograms and a method of making holograms, and apparatus for making holograms.
  • holograms produce a three dimensional image such that the viewer will see a different aspect of the image depending on where he or she is standing in relation to the image. For certain applications it would be advantageous to provide a hologram which produced an image which presented the same information, however it was viewed, such a hologram would be useful for display signs for example.
  • the hologram would typically have different parts of a photo-sensitive plate separately exposed to interference fringes formed by different parts of the object to be imaged.
  • the word may be divided into a series of letters or parts of letters and each letter or part used as a separate object for the purpose of forming interference fringes.
  • the resulting fringes are recorded on a specific portion of a photographic plate so that each portion of the plate relates to a different portion of the word.
  • UK-A-1292110 discloses a display made in accordance with this process.
  • the intention of this UK patent application is to provide a road sign which can display one of a number of different pieces of information either as a static display or as an alternating display between two words.
  • the problem with this previous proposal is that whatever message is displayed is fixed in space and the change in the message displayed is under the control of the apparatus as it requires different illuminating light sources to be activated so as to change the angle of illumination and hence the message displayed.
  • a sign which comprises an array of elements each comprising a first lens and a second lens and an optical object in registry with the first and second lenses such that the virtual image of the optical object formed in the second lens lies on the focal surface of the first lens.
  • the optical objects consist of a representation of the information which the sign is to present.
  • the optical objects are substantial identical to each other and the image of the optical objects seen by a viewer moving past the sign thus appears to be stationary with respect to the viewer.
  • Holographic material has been used in a number of different types of optical systems and UK-A-1233242 discloses an optical system utilizing a holographic material for creating an array of identical images in two dimensions from a single hologram by illuminating the hologram with reference light sources at varying angles depending on the spacing of the array of images.
  • the application suggested for this apparatus is the production of semiconductor devices which require extremely accurate images to be transferred to a photo ⁇ resist layer in a contactless manner so as to avoid imperfections and loss of resolution which would otherwise occur if a contact process were utilized.
  • the present invention provides a visual display device comprises a plurality of identical elements, each element consisting of a hologram having a plurality of multiplexed patterns corresponding respectively to a plurality of different images stored by the hologram.
  • the present invention further provides a method of forming a holographic display device comprising illuminating a first part of an object to be viewed, recording on different parts of a first hologram element first interference patterns corresponding to respective different views of the first part of the object, illuminating a further part of the object to be viewed, recording on further different parts of the first hologram element further interference patterns corresponding to respective different views of the further part of the object, creating further hologram elements with recorded first and further interference patterns identical to the patterns recorded on the first hologram element, and assembling hologram elements thus formed into a display.
  • Figure 1 is a schematic diagram illustrating how a conventional hologram is formed
  • Figure 2 is a schematic diagram illustrating the formation of a conventional multiplexed hologram
  • Figures 3a and 3b are schematic diagrams illustrating a first method of making holograms according to the present invention.
  • Figure 4 is a schematic diagram illustrating a master hologram made by the method shown in Figure 3;
  • Figures 5a and 5b show how a transfer hologram may be formed from a master hologram
  • Figure 6 shows an array of secondary holograms made from the master hologram in Figure 4.
  • Figures 7a to 7e show various holographic images seen by viewing the array of Figure 6 from different positions;
  • Figures 8 to 11 show various arrangements of equipment for producing a hologram as shown in Figures 6 and 7;
  • Figures 12a and 12b are schematic diagrams illustrating a further method of making holograms according to the present invention.
  • Figure 13a shows an array of secondary holograms made from the master hologram shown in Figure 12a;
  • Figures 13b to 13h show various holographic images seen by viewing the array of Figure 13a from different positions;
  • Figures 14 and 14b are schematic diagrams illustrating a further method of making holograms according to the present invention.
  • Figures 15 and 15a to 15e show a further method for producing a master hologram according to the present invention.
  • a master hologram is made by a technique similar to that used in for so-called "multiplexed holograms".
  • multiplexed holograms To facilitate an understanding of this embodiment, conventional holograms and then multiplexed holograms will first be briefly described.
  • Figure 1 is a schematic diagram illustrating the process for production of a conventional hologram, which is formed by photographically recording an interference pattern between coherent radiation Es scattered from an object 10 and a reference beam of coherent radiation, ER.
  • the photo-sensitive plate 11 is developed and suitably illuminated to reconstruct an image.
  • Figure 2 illustrates diagrammatically the formation of a multiplexed hologram.
  • a multiplexed hologram is formed using a series of slides 13 or other suitable transparencies, projected using laser light onto a diffusion or projection screen 14, showing different views of the object instead of the original three dimensional object.
  • the interference pattern from each slide is exposed onto an appropriate portion 11a of a photo-sensitive plate 11 while the rest of the plate is masked off.
  • the mask is then moved to the adjacent portion of the photo-sensitive plate (in direction D), and the photo-sensitive plate is exposed to the next projected image. Once developed and appropriately illuminated the plate has recorded a continuous series of stereographic images creating a three dimensional illusion.
  • a conventional or multiplexed hologram of the type described above is referred to as a master hologram.
  • a master hologram may be used to make further holograms by various techniques.
  • the further holograms are variously referred to as copy holograms, secondary holograms and transfer holograms.
  • Figures 3 to 6 illustrate a very simple example of a method of making a hologram according to the present invention.
  • the desired holographic image is a sign displaying the words DANGER.
  • the reference beams have been left out for the sake of clarity, although they are essential for forming the interference patterns with the object light (Es).
  • Es object light
  • Figure 3 using a technique similar to the multiplexed hologram technique described above, different parts of a photographic plate are exposed to different interference fringes so that the final complete pattern represents the whole word.
  • a portion of a photo-sensitive plate 20 is exposed to interference fringes formed by scattering laser light (Es) through an object 21 in the shape of a letter "D".
  • the letters are reversed in Figure 3, as they are read from the direction of the photographic plate.
  • the object may be a stencil or a letter painted on a transparent plate for example.
  • the remainder of the plate 20 is protected by a baffle 22.
  • a second portion of the plate is exposed to the patterns formed by the letter "A" object 23 using a baffle 24 and so on through to the end of the word.
  • a transfer or a copy hologram (hereafter H2) is made by traditional methods.
  • the HI hologram is illuminated using laser light Es. This creates an optical image of the original objects.
  • a second photo ⁇ sensitive plate H2 is placed at the position of this image and "referenced" with a secondary laser beam ER causing an interference pattern at the H2 which is then developed to form the copy hologram.
  • the following relates to possible arrangements of equipment for producing holograms according to the invention.
  • FIG 8 shows one arrangement for producing HI holograms necessary for this invention.
  • the photo ⁇ sensitive plate 80 has a baffle or mask 81 in front of it.
  • the mask 81 allows exposure of consecutive parts of the photo-sensitive plate 80 as the mask is moved in direction 82 between exposures.
  • a stencil, drawing, transparency or any image-forming device 83 is placed in front of a diffusion screen 84.
  • the diffusion screen is suitably illuminated by laser light (Es). This light only needs to cover the area 86 of the diffusion screen 84 which is the size of the single copy holograms, which will be later grouped into an array.
  • the stencil is also moved in direction 82 between exposures.
  • an optional link 85 can be used to move mask and stencil in synchronisation with each other.
  • images longer or shorter than the photo-sensitive plate can also be made in which case the mask and stencil would be moved at different rates over the HI production period. In this case the optional link would not be used.
  • Figure 9 shows another scenario where the photo-sensitive plate 90 and its' baffle 91 act similarly to the example of Figure 8.
  • the stencil is replaced by using a projection device 93 through which laser light (Es) is projected through a transparency 95 onto a diffusion/back-projection screen 94.
  • the baffle 91 would be moved in direction 92 and the transparency changed to a different image between exposures. These images would be equivalent to the moving stencil.
  • the images in Figure 9 are a crude version. In a smooth version only consecutive vertical slices of letters, words or images would be used.
  • Figure 10 describes the way in which one copy hologram H2 can be made from the HI hologram by traditional means.
  • Figure 10 shows the master hologram HI and forming an image of overlapping letters at 116.
  • a single photo-sensitive plate H2 is then placed close to the plane of that image and referenced by more laser light ER. This is then developed to form a hologram H2.
  • Many H2's would be made by this method and then panelled together into an array.
  • Arrays of H2's could also be made using a "step and repeat" mechanism as in Figure 11. This is similar to Figure 10 except that a static baffle 117 is placed either side of the source image to mask off unwanted source light Es and H2 reference light ER. Behind the baffle is a length of unexposed photo-sensitive plate or film H2 which is moved in direction 118 between exposures. By this method an array of secondary holograms can be produced on one piece of photo-sensitive material.
  • a further development of this invention would be to make a master hologram in which the image to be recorded has been divided up along the vertical axis (hereafter Y) as well as the horizontal axis (hereafter X) ( Figure 12a) .
  • laser light Es is passed through a diffusion screen 121 and then through part of a stencil 122. Some of this light forms interference fringes with the reference light ER when they meet at the photo-sensitive plate (hereafter PI).
  • PI photo-sensitive plate
  • There is a baffle 123 which has a hole cut in it 124 so that only the appropriate portion of PI is exposed.
  • the stencil 122 and the baffle 123 would be moved between exposures, firstly in direction X to form a row of exposed PI.
  • the stencil and baffle would then be moved up one row in direction Y and the procedure repeated until PI is fully exposed.
  • the diffusion screen 121 and the photo-sensitive plate PI do not move throughout the whole process.
  • FIG. 12b is a schematic diagram showing this relationship, so that portion P/l, P/2, P/3, P/4, P/5, P/6, P/7, P/8, P/9 etc of the photo-sensitive plate PI will be exposed to portions S/l, S/2, S/3, S/4, S/5, S/6, S/7, S/8, S/9 etc of the stencil 122.
  • the photo ⁇ sensitive plate would be developed by traditional means to form an HI master hologram.
  • Many copy holograms H2s
  • H2s would be made by traditional methods or by a step and repeat method similar to those shown in Figures 10 and 11.
  • These holograms would be tiled together into a two dimensional array of holograms H2s by various methods ( Figure 13a).
  • Figure 13a For the clarity of the following examples a picture frame 131 has been placed around the array of holograms.
  • Figure 13b shows example viewing positions El, E2, E3, E4 and E5, all perpendicular to the H2 array (H2s), and looking towards XY1, XY2, XY3, XY4 and XY5 respectively.
  • Figure 13c shows the stencil image with border as used in this example 132.
  • Figures 13d, 13e, 13f, 13g and 13h show what the viewer would actually see from positions El, E2, E3, E4 and E5 respectively.
  • Figures 13d to 13h are drawn in perspective, meaning that the frame 131 around the array of holograms (H2s) is smaller as the viewpoint is further away and larger as it is closer. It is important to note that the image 132 of the jug always remains the same size relative to the viewpoint regardless of the distance from the array. The converse is also true, in that, if the holographic array of H2s is moved past the viewer and the viewer is static, then the image does not change (provided that the viewer is always at 90 degrees to the plane of the array)
  • Figure 14 shows a method of making an XY array of holograms, without first producing a master hologram, with a similar result to that of Figures 13a to 13h.
  • a stencil (141) and a diffusion screen (142) are used to deflect/scatter the coherent light (Es) through the stencil, which is between the diffusion screen and the photo-sensitive medium (PI). Some of the light (Ess) will reach the photo-sensitive medium (PI) through an aperture (144) in the mask (145).
  • a reference beam of coherent light (ER) is directed to the same position from an appropriate angle (AR), forming interference fringe patterns which can later be developed to produce a hologram.
  • the photo-sensitive medium (PI) is moved sequentially in directions X and Y with respect to the mask which is stationary so that the fringe patterns can be exposed to it.
  • the photo-sensitive medium is in turn developed into an array of holograms.
  • the hologram could be of the type known as a "Reflection Hologram” or “Transmission Hologram” or “Edge-lit Hologram” or indeed any practical method of making holograms.
  • Figure 14b is an example of how the resulting array of holograms might look from a position VI.
  • the phenomenon of the angular relationship of image to surface is maintained, giving similar visual results to those described here in Figures 13a to 13h. It also shows how, because of the angular relationship of each array element to the eye, the resulting image will appear to be inverted.
  • An optional lens (not shown), or other focussing device, could be placed between the stencil (141) and the aperture (144) to maximise the amount of light (Ess) reaching the photo-sensitive plate.
  • a suitable reference beam of light (ER) is then required to form the necessary interferenced patterns, in order to make an array of holograms as with the previous example. Again, the directional/angular relationship of image to surface is maintained and, once the resulting array of holograms is produced and lit, will give similar image phenomena to those described here and shown in Figures 13a to 13h and Figure 14b.
  • FIG. 15 shows a further method for producing a master hologram, according to the present invention.
  • a beam of coherent reference light is directed to the photo-sensitive plate (PI) at a suitable angle (AR) .
  • Another beam of coherent light is focussed by a lens (151) so that it converges to the same point (152) on the photo-sensitive plate (PI) forming an interference pattern which can be later developed.
  • the photo-sensitive plate is moved in the horizontal and vertical directions, and exposures made consecutively, forming an array of interference patterns which can be developed. This array could be similar in position to the picture cells (or pixels) of a cathode ray tube, computer or television screen. If selective exposures are made, i.e. the laser beam is switched on and off so that not every position in the plate is exposed, designs could be built up to produce a master hologram of unexposed and exposed areas.
  • exposures do not necessarily need to be made in a grid fashion and could be made consecutively in any direction in the X Y plane by moving the photo-sensitive plate. This could be construed as a method of "drawing" the exposures in a vector format.
  • FIG. 15a shows such a master which, for clarity and example, has been sequentially exposed in the form of the letter "R". Every array element of the exposed parts of the master will diffract an image of the lens ( Figure 15b). This effectively means that the light will fan out from each point on the master hologram, through a broad angle (153,154). As the light spreads from each pixel point ( Figure 15c), it can be seen that, at a certain distance from the master ( Figure 15d) there are spatial locations (155) which receive light from every diffracting array element of the master hologram. This "sub-set” position (155) receives light from each array element as shown in Figure 15e.
  • This master hologram can then be used to produce an array of secondary holograms, hitherto described.
  • a hologram according to this invention can be made by numerous methods and is not limited to the specific examples described above.
  • any appropriate photo-sensitive material could be used for the production of the master or transfer holograms.
  • they may be produced by other methods such as the formation of relief patterns by embossing, engraving, etching, casting or moulding or any other optical, electronic, magnetic or storage technique.
  • An application of this invention could be in the sign industry with road signs easily legible from any distance.
  • Application of the XY field array hologram include:- road signs in which the image stays the same size from any distance; signs which animate as the viewer gets closer.
  • An application might be a "Slow Down" sign of animated Slow Down chevrons as a driver nears a bend.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

Un dispositif d'affichage holographique, utilisé notamment dans l'affichage d'informations se présentant sous la forme de mots, est constitué d'un réseau d'hologrammes identiques, chacun contenant tous les motifs nécessaires pour former la totalité des informations à afficher. Chaque hologramme est obtenu soit à l'aide d'un hologramme-mère, soit directement par la création de motifs multiplexés à partir d'un nombre de parties différentes des informations à afficher. Ce type d'affichage crée l'impression d'une image qui se déplace en même temps que l'observateur, ce qui présente un avantage dans les signaux d'avertissement ou les signaux routiers.
EP94913170A 1993-04-21 1994-04-21 Hologrammes Withdrawn EP0695440A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9308224 1993-04-21
GB939308224A GB9308224D0 (en) 1993-04-21 1993-04-21 Optical device
PCT/GB1994/000844 WO1994024615A1 (fr) 1993-04-21 1994-04-21 Hologrammes

Publications (1)

Publication Number Publication Date
EP0695440A1 true EP0695440A1 (fr) 1996-02-07

Family

ID=10734201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94913170A Withdrawn EP0695440A1 (fr) 1993-04-21 1994-04-21 Hologrammes

Country Status (6)

Country Link
EP (1) EP0695440A1 (fr)
JP (1) JPH09500219A (fr)
AU (1) AU6542294A (fr)
CA (1) CA2161082A1 (fr)
GB (1) GB9308224D0 (fr)
WO (1) WO1994024615A1 (fr)

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Publication number Priority date Publication date Assignee Title
US5734485A (en) * 1995-04-25 1998-03-31 Rocky Research Large display composite holograms and methods
GB0013379D0 (en) 2000-06-01 2000-07-26 Optaglio Ltd Label and method of forming the same
EP1287486A2 (fr) 2000-06-05 2003-03-05 Optaglio Limited Systeme et procede de verification et d'authentification de produits
GB0016354D0 (en) * 2000-07-03 2000-08-23 Optaglio Ltd Optical security device
GB0016358D0 (en) 2000-07-03 2000-08-23 Optaglio Ltd Optical device
GB0016359D0 (en) 2000-07-03 2000-08-23 Optaglio Ltd Optical apparatus
GB0016356D0 (en) 2000-07-03 2000-08-23 Optaglio Ltd Optical structure
JP3964665B2 (ja) * 2001-12-17 2007-08-22 大日本印刷株式会社 計算機ホログラムの作成方法
US20070268536A1 (en) * 2002-07-10 2007-11-22 De La Rue Inernaional Limited De La Rue House Optically Variable Security Device
DE102006016389B4 (de) 2006-04-05 2018-06-14 Sew-Eurodrive Gmbh & Co Kg Gerät mit Typschild mit Hologramm
JP5347248B2 (ja) * 2007-08-09 2013-11-20 大日本印刷株式会社 画面切替型ホログラム

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GB1278672A (en) * 1968-06-20 1972-06-21 Konishiroku Photo Ind Method of producing stereographic image
GB1292110A (en) * 1970-05-21 1972-10-11 Claudgen Ltd Improvements in or relating to visual display devices
US4206965A (en) * 1976-08-23 1980-06-10 Mcgrew Stephen P System for synthesizing strip-multiplexed holograms
US4878719A (en) * 1988-12-15 1989-11-07 Hughes Aircraft Company Automotive wheel covers with spatially stabilized images
US5056880A (en) * 1990-04-08 1991-10-15 Dz Company Holographic wallpaper
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Title
See references of WO9424615A1 *

Also Published As

Publication number Publication date
WO1994024615A1 (fr) 1994-10-27
CA2161082A1 (fr) 1994-10-27
AU6542294A (en) 1994-11-08
GB9308224D0 (en) 1993-06-02
JPH09500219A (ja) 1997-01-07

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