WO1990001182A1 - Display of holograms - Google Patents

Display of holograms Download PDF

Info

Publication number
WO1990001182A1
WO1990001182A1 PCT/GB1989/000842 GB8900842W WO9001182A1 WO 1990001182 A1 WO1990001182 A1 WO 1990001182A1 GB 8900842 W GB8900842 W GB 8900842W WO 9001182 A1 WO9001182 A1 WO 9001182A1
Authority
WO
WIPO (PCT)
Prior art keywords
hologram
display apparatus
light source
mounting means
hologram display
Prior art date
Application number
PCT/GB1989/000842
Other languages
French (fr)
Inventor
Stephen M. Crouch
Original Assignee
Crouch Stephen M
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 Crouch Stephen M filed Critical Crouch Stephen M
Publication of WO1990001182A1 publication Critical patent/WO1990001182A1/en

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
    • G03H1/2286—Particular reconstruction light ; Beam properties
    • 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
    • G03H1/24—Processes or apparatus for obtaining an optical image from holograms using white light, e.g. rainbow 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
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H2001/0055—Adaptation of holography to specific applications in advertising or decorative art
    • 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
    • G03H2001/2223—Particular relationship between light source, hologram and observer
    • G03H2001/2231—Reflection reconstruction
    • 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
    • G03H2001/2223—Particular relationship between light source, hologram and observer
    • G03H2001/2234—Transmission reconstruction
    • 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
    • G03H2001/2263—Multicoloured holobject
    • G03H2001/2268—Rainbow hologram
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/20—Coherence of the light source
    • G03H2222/22—Spatial coherence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/20—Coherence of the light source
    • G03H2222/24—Low coherence light normally not allowing valuable record or reconstruction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2227/00—Mechanical components or mechanical aspects not otherwise provided for
    • G03H2227/05—Support holding the holographic record
    • G03H2227/06—Support including light source

Definitions

  • the present invention relates to the display of holograms.
  • Holographic display systems in current use tend to be large, clumsy devices which require the light source to be positioned a considerable distance away from the hologram to be displayed.
  • the distance between the light source and the hologram combined with the use of relatively low power spot lamps, means that existing systems invariably produce poorly illuminated, dim holograms which do not compete well with normal background illumination. This problem has meant that it has not until now been a practical proposition to use holograms in commercial applications such as advertising.
  • the invention proceeds from a recognition that, for the display of rainbow holograms, completely coherent light is not an absolute requirement.
  • inexpensive 220/240 V strip lamps can be used, in spite of conventional opinion that these are not suitable because of their limited spatial coherence. It is believed that it has not before been appreciated that by sacrificing linear coherence in one direction (a sacrifice which is of no significance in the reconstruction of rainbow holograms) , the choice of light sources available at a reasonable cost increases dramatically, as does the potential for using significantly brighter sources without encountering cooling and/or coherence problems.
  • a hologram display apparatus comprises mounting means for locating a hologram to be viewed, and a linear light source positioned generally perpendicular to the plane of a hologram when located by the mounting means.
  • This type of display apparatus is particularly suitable for use with rainbow transmission holograms, although it can also be used for rainbow reflection holograms.
  • a hologram display apparatus comprises a generally cuboid light box having an aperture in one side wall and mounting means arranged to locate a rainbow transmission hologram within or covering the aperture, a linear light source mounted within the box generally perpendicular to the plane of the aperture, and an angled mirror arranged to direct light from the light source to the aperture.
  • a display apparatus of this type provides a very compact cabinet enabling the display of holograms in areas where space is at a premium and where the use of holographic displays would previously have been excluded for this reason.
  • a hologram display apparatus comprises mounting means for locating a hologram to be viewed, an at least partially coherent light source, and a holographic optical element arranged to direct light from the source to a hologram when located by the mounting means.
  • figure 1 is a front elevation of a hologram display cabinet
  • figure 2 is a section along the line ⁇ -A of figure 1
  • figure 3 is a perspective view of the box of figure 1
  • figure 4 is a front elevation of an alternative cabinet, having a curved mirror
  • figure 5 is a section along the line B-B of figure 4.
  • FIGS 1 to 3 illustrate a hologram display cabinet or box 10 embodying the present invention.
  • the box is generally cuboid in shape with a removable front surface 12 in the form of a lid.
  • a hologram 16 to be displayed.
  • the hologram which may be of any desired size or shape, may be any one of the types known as rainbow, open aperture, colour, achromatic, or indeed any other type of transmission hologram.
  • this light source is a standard 220/240 volt strip lamp, for example of the quartz halogen or the incandescent type.
  • the lamp may be of a few centimetres in length, but of course the actual size will depend upon the size of the hologram to be illuminated, and the required brightness. If desired, two or more strip lamps may be used, placed end to end.
  • a curved elongate reflector 20 Located immediately behind the light source 18 is a curved elongate reflector 20, having a specular surface, the purpose of which is to produce a focus at a short distance in front of the light source 18 and thereby to increase the spatial coherence of the light.
  • a reflector improves the overall brightness of the lighting.
  • a focusing condenser lense Positioned in front of the light source 18 is a focusing condenser lense, which operates ; to increase the light-collecting efficiency and also to provide a focus for the light in a convenient position. If desired, this condenser could be supplemented, or even replaced, by a holographic optical element (not shown) .
  • a pair of baffles Positioned above the condenser 22, and conveniently extending inwardly from the front and back surfaces of the box 10 are a pair of baffles to prevent the light from the light source 18 from impinging directly upon the hologram 16 or upon the rear of the box.
  • a plurality of vertical baffles may be provided extending perpendicularly to the light source and preventing light from the source from impinging directly upon the sides of the box perpendicular to the hologram.
  • a planar mirror 26 positioned to receive the light from the light source and to direct it onto the hologram at the required angle.
  • the angle in question will depend upon, the beam geometry which was used to create the hologram in the first place. It is envisaged that holograms may be produced specifically for display in this cabinet; alternatively, the angle of the mirror could be adjustable.
  • the box may also have a variable voltage control (28) and (not shown) a mains on/off switch, a cooling fan, heat absorbing filters and narrow band transmission filters as required.
  • a variable voltage control (28) and (not shown) a mains on/off switch, a cooling fan, heat absorbing filters and narrow band transmission filters as required.
  • Figures 4 and 5 illustrate schematically an alternative box 10a, identical to the box 10 except that a curved mirror 26a is provided.
  • the curvature of the mirror may be chosen according to the requirements of the reference beam for the hologram to be illuminated, and conveniently may be twice the distance d between the effective focal point of the light source 18 and the mirror surface. Suitable adjusting screws (not shown) may be provided whereby the curvature of the mirror may be adjusted easily from outside the box.
  • the hologram to be viewed is placed not in the aperture of the lid, but instead on the base of the box with the mirror 26 or 26a angled appropriately to illuminate the hologram.
  • the hologram can then be viewed, from the front, via the aperture in the lid.

Landscapes

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

Abstract

A hologram display apparatus comprises a rectangular light box having a rainbow transmission hologram (16) mounted in an aperture (14) in one side wall. The hologram is illuminated by means of a linear light source (18) mounted within the box on an axis generally perpendicular to that of the hologram. Light from the source (18) passes through a condenser and/or holographic optical element (22), past baffles (24), and is reflected by an angled mirror (26) to the hologram. The mirror may either be planar or curved about an axis parallel to that of the light source.

Description

DISPLAY OF HOLOGRAMS
The present invention relates to the display of holograms.
Holographic display systems in current use tend to be large, clumsy devices which require the light source to be positioned a considerable distance away from the hologram to be displayed. The distance between the light source and the hologram, combined with the use of relatively low power spot lamps, means that existing systems invariably produce poorly illuminated, dim holograms which do not compete well with normal background illumination. This problem has meant that it has not until now been a practical proposition to use holograms in commercial applications such as advertising. There has, for some time, been a need to provide a way of displaying holograms in a manner, and at a brightness, comparable to that currently employed to display transparencies. Until now, efforts to achieve this have not been fruitful, primarily because it is difficult to conceive of a way of increasing the level of illumination using the low power spot lamps which are employed to give what is considered to be the necessary spatial coherence properly to display a hologram. It is an object of the present invention at least to alleviate these difficulties. It is a further object to provide a display system which is compact, inexpensive and which can provide a substantially improved level of illumination. It is another object to provide a hologram display apparatus in which the normally sharp colour bands associated with "rainbow" holograms are graduated.
It is yet another object to provide a hologram display apparatus which can be used to display several holograms at once.
It is another object to provide an improved display apparatus for reflection holograms.
In a first aspect, the invention proceeds from a recognition that, for the display of rainbow holograms, completely coherent light is not an absolute requirement. The applicant has found that in practice, inexpensive 220/240 V strip lamps can be used, in spite of conventional opinion that these are not suitable because of their limited spatial coherence. It is believed that it has not before been appreciated that by sacrificing linear coherence in one direction (a sacrifice which is of no significance in the reconstruction of rainbow holograms) , the choice of light sources available at a reasonable cost increases dramatically, as does the potential for using significantly brighter sources without encountering cooling and/or coherence problems.
According to a first aspect of the present invention a hologram display apparatus comprises mounting means for locating a hologram to be viewed, and a linear light source positioned generally perpendicular to the plane of a hologram when located by the mounting means.
This type of display apparatus is particularly suitable for use with rainbow transmission holograms, although it can also be used for rainbow reflection holograms.
According to a second aspect of the invention a hologram display apparatus comprises a generally cuboid light box having an aperture in one side wall and mounting means arranged to locate a rainbow transmission hologram within or covering the aperture, a linear light source mounted within the box generally perpendicular to the plane of the aperture, and an angled mirror arranged to direct light from the light source to the aperture.
A display apparatus of this type provides a very compact cabinet enabling the display of holograms in areas where space is at a premium and where the use of holographic displays would previously have been excluded for this reason.
According to another aspect of the invention a hologram display apparatus comprises mounting means for locating a hologram to be viewed, an at least partially coherent light source, and a holographic optical element arranged to direct light from the source to a hologram when located by the mounting means.
The invention may be carried into practice in a number of ways and one specific hologram display apparatus embodying the invention will now be described, by way of example, with reference to the drawings, in which: figure 1 is a front elevation of a hologram display cabinet; figure 2 is a section along the line Λ-A of figure 1 ; figure 3 is a perspective view of the box of figure 1 ; figure 4 is a front elevation of an alternative cabinet, having a curved mirror; figure 5 is a section along the line B-B of figure 4.
Figures 1 to 3 illustrate a hologram display cabinet or box 10 embodying the present invention. The box is generally cuboid in shape with a removable front surface 12 in the form of a lid. Within an aperture of the lid is mounted, in suitable mountings 14, a hologram 16 to be displayed. The hologram, which may be of any desired size or shape, may be any one of the types known as rainbow, open aperture, colour, achromatic, or indeed any other type of transmission hologram. Mounted centrally within one end of the box 10, along an axis which is generally perpendicular to the plane of the hologram 16, is a linear or strip light source 18. Conveniently, this light source is a standard 220/240 volt strip lamp, for example of the quartz halogen or the incandescent type. Typically, the lamp may be of a few centimetres in length, but of course the actual size will depend upon the size of the hologram to be illuminated, and the required brightness. If desired, two or more strip lamps may be used, placed end to end.
Located immediately behind the light source 18 is a curved elongate reflector 20, having a specular surface, the purpose of which is to produce a focus at a short distance in front of the light source 18 and thereby to increase the spatial coherence of the light. In addition, of course, such a reflector improves the overall brightness of the lighting.
Positioned in front of the light source 18 is a focusing condenser lense, which operates ;to increase the light-collecting efficiency and also to provide a focus for the light in a convenient position. If desired, this condenser could be supplemented, or even replaced, by a holographic optical element (not shown) . Positioned above the condenser 22, and conveniently extending inwardly from the front and back surfaces of the box 10 are a pair of baffles to prevent the light from the light source 18 from impinging directly upon the hologram 16 or upon the rear of the box. Alternatively, instead of or as well as extending from opposite sides of the box, a plurality of vertical baffles (not shown) may be provided extending perpendicularly to the light source and preventing light from the source from impinging directly upon the sides of the box perpendicular to the hologram.
At the end of the box opposite the light source 18 there is a planar mirror 26, positioned to receive the light from the light source and to direct it onto the hologram at the required angle. Of course, the angle in question will depend upon, the beam geometry which was used to create the hologram in the first place. It is envisaged that holograms may be produced specifically for display in this cabinet; alternatively, the angle of the mirror could be adjustable.
The box may also have a variable voltage control (28) and (not shown) a mains on/off switch, a cooling fan, heat absorbing filters and narrow band transmission filters as required.
Figures 4 and 5 illustrate schematically an alternative box 10a, identical to the box 10 except that a curved mirror 26a is provided. The curvature of the mirror may be chosen according to the requirements of the reference beam for the hologram to be illuminated, and conveniently may be twice the distance d between the effective focal point of the light source 18 and the mirror surface. Suitable adjusting screws (not shown) may be provided whereby the curvature of the mirror may be adjusted easily from outside the box.
In a final embodiment of the invention (not shown) used for displaying reflection holograms, particularly rainbow reflection holograms, the hologram to be viewed is placed not in the aperture of the lid, but instead on the base of the box with the mirror 26 or 26a angled appropriately to illuminate the hologram. The hologram can then be viewed, from the front, via the aperture in the lid.

Claims

1. A hologram display apparatus comprising mounting means for locating a hologram to be viewed, and a linear light source positioned generally perpendicular to the plane of a hologram when located by the mounting means.
2. A hologram display apparatus as claimed in Claim 1 including an angled mirror arranged to direct light from the light source to a hologram when located by the mounting means.
3. A hologram display apparatus as claimed in Claim 2 in which the angled mirror is generally planar.
4. A hologram display apparatus as claimed in Claim 2 in which the angled mirror is curved about an axis generally parallel to that of the light source.
5. A hologram display apparatus as claimed in Claim 4 including adjusting means for adjusting the radius of curvature of the mirror.
6. A hologram display apparatus as claimed in Claim 4 in which the radius of curvature of the mirror is substantially twice the distance between the mirror and the optical position of the light source.
7. A hologram display apparatus as claimed in any one of the preceding claims including a condenser positioned in front of the light source.
8. A hologram display apparatus as claimed in any one of the preceding claims including a curved reflector positioned behind the light source.
9. A hologram display apparatus as claimed in any one of the preceding claims including baffles positioned in front of the light source and arranged to block light from directly impinging upon a hologram when located by the mounting means.
10. A hologram display apparatus as claimed in any one of the preceding claims including a holographic optical element positioned in front of the light source.
11. A hologram display apparatus as claimed in any one of the preceding claims in which the display apparatus comprises a light box, with the mounting means being positioned for location of a hologram within or covering an aperture in one side wall of the box.
12. A hologram display apparatus as claimed in Claim 11 in which the said side wall of the box is part of a removable lid.
13. A hologram display apparatus as claimed in any one of Claims 1 to 10 in which the display apparatus comprises a light box, with the mounting means being positioned for location of a hologram against one side wall of the box, opposite a viewing aperture in an opposing side wall.
14. A hologram display apparatus as claimed in any one of Claims 1 to 12 including a rainbow transmission hologram located by the mounting means.
15. A hologram display apparatus as claimed in any one of Claims 1 to 10 or Claim 13 including a rainbow reflection hologram located by the mounting means.
16. A hologram display apparatus comprising a generally cuboid light box having an aperture in one side wall and mounting means arranged to locate a rainbow transmission hologram within or covering the aperture, a linear light source mounted within the box generally perpendicular to the plane of the aperture, and an angled mirror arranged' to direct light from the light source to the aperture.
17. A hologram display apparatus as specifically herein described with reference to figures 1 to 3, with or without the modifications of figures 4 to 5, and with or without the modifications mentioned in the text.
18. A hologram display apparatus comprising mounting means for locating a hologram to be viewed, an at least partially coherent light source, and a holographic optical element arranged to direct light from the source to a hologram when located by the mounting means.
19. A hologram display apparatus comprising mounting means for locating a hologram to be viewed, a linear light source, and a plano-convex mirror curved about an axis generally parallel to that of the light source and arranged to direct light from the source to a hologram when located by the mounting means.
lϋ
15
2\)
JW
PCT/GB1989/000842 1988-07-28 1989-07-25 Display of holograms WO1990001182A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888818048A GB8818048D0 (en) 1988-07-28 1988-07-28 Display of holograms
GB8818048.4 1988-07-28

Publications (1)

Publication Number Publication Date
WO1990001182A1 true WO1990001182A1 (en) 1990-02-08

Family

ID=10641288

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000842 WO1990001182A1 (en) 1988-07-28 1989-07-25 Display of holograms

Country Status (3)

Country Link
AU (1) AU4036889A (en)
GB (1) GB8818048D0 (en)
WO (1) WO1990001182A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992018913A1 (en) * 1991-04-10 1992-10-29 Derk Scott Peterson Hologram lighting system
EP0969337A1 (en) * 1997-03-18 2000-01-05 Matsushita Electric Industrial Co., Ltd. Optical display
WO2004066038A1 (en) * 2003-01-23 2004-08-05 John Stuart Fleming Improved hologram display system
FR2900759A1 (en) * 2006-05-04 2007-11-09 Jcdecaux Sa Communication element`s e.g. logo, image display device for e.g. airport, has lighting system with light source placed in plane comprising hologram and emitting light to illuminate hologram of display surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3917379A (en) * 1973-09-11 1975-11-04 Fuji Photo Film Co Ltd Optical image reproducing system for a hologram using a linear white light source
WO1985005482A1 (en) * 1984-05-14 1985-12-05 R.S. Productions Limited Improvements in or relating to the display of holograms
WO1987000954A1 (en) * 1985-08-07 1987-02-12 Robinson Anthony J B Holographic display means
JPS6263983A (en) * 1986-08-26 1987-03-20 Dainippon Printing Co Ltd Reconstructing method for hologram

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3917379A (en) * 1973-09-11 1975-11-04 Fuji Photo Film Co Ltd Optical image reproducing system for a hologram using a linear white light source
WO1985005482A1 (en) * 1984-05-14 1985-12-05 R.S. Productions Limited Improvements in or relating to the display of holograms
WO1987000954A1 (en) * 1985-08-07 1987-02-12 Robinson Anthony J B Holographic display means
JPS6263983A (en) * 1986-08-26 1987-03-20 Dainippon Printing Co Ltd Reconstructing method for hologram

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Applied Optics, Vol. 25, No. 22, 15 November 1986 (New York, N.Y., US), P.G. BOJ et al.: "Display of Ordinary Transmission Holograms with a White Light Source", pages 4146-4149, see figure 1 *
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 260 (P-608)(2707), 22 August 1987; & JP-A-62063983 (Dainippon Printing Co. Ltd) 20 March 1987 *
PATENT ABSTRACTS OF JAPAN, Vol. 3, No. 71 (E-118), 20 June 1979; & JP-A-5451540 (Fuji Shashin Koki K.K.) 23 April 1979 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992018913A1 (en) * 1991-04-10 1992-10-29 Derk Scott Peterson Hologram lighting system
EP0969337A1 (en) * 1997-03-18 2000-01-05 Matsushita Electric Industrial Co., Ltd. Optical display
WO2004066038A1 (en) * 2003-01-23 2004-08-05 John Stuart Fleming Improved hologram display system
FR2900759A1 (en) * 2006-05-04 2007-11-09 Jcdecaux Sa Communication element`s e.g. logo, image display device for e.g. airport, has lighting system with light source placed in plane comprising hologram and emitting light to illuminate hologram of display surface

Also Published As

Publication number Publication date
GB8818048D0 (en) 1988-09-01
AU4036889A (en) 1990-02-19

Similar Documents

Publication Publication Date Title
EP0061905A1 (en) Task lighting system
US5089943A (en) Illuminating device, having two identical lamps connected in parallel
EP0156561A1 (en) Optical focusing system
KR910700594A (en) 3D display device
US3552819A (en) Illuminated reticle for optical viewing instruments
AU3791693A (en) Display case with lens lighting system
US2691918A (en) Illuminating means for optical instruments
US6072606A (en) Close-lit holographic nightlight display lighting system
US5788579A (en) Illusion mirror light display
US3009054A (en) Prismatic lighting fixture
US5371656A (en) Apparatus for displaying an illuminated image and method therefor
US4451875A (en) Poster panel lighting fixture
US3767305A (en) Retro-reflex viewer for detecting counterfeit identity cards
US6513954B2 (en) Rainbow projection light
KR920011825A (en) Car Head Up Display
KR840000789A (en) Gun sight
WO1990001182A1 (en) Display of holograms
US3293983A (en) Non-stereo depth perception projection display device
US4940301A (en) Method and apparatus for enhancing a holographic image by candlelight
US5293259A (en) Integrated rainbow hologram
US2026478A (en) Lighting device for projecting machines
US4214297A (en) Arrangement for spectral dispersion of a bundle of light
US4403964A (en) Star projectors for planetaria
US2130023A (en) Illuminated sign
US4100591A (en) Illumination unit for microfilm readers

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CH DE DK FI GB HU JP KP KR LK LU MC MG MW NL NO RO SD SE SU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CM DE FR GA GB IT LU ML MR NL SE SN TD TG

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642