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WO1992018913A1 - Systeme d'eclairage pour hologramme - Google Patents

Systeme d'eclairage pour hologramme Download PDF

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Publication number
WO1992018913A1
WO1992018913A1 PCT/GB1992/000641 GB9200641W WO9218913A1 WO 1992018913 A1 WO1992018913 A1 WO 1992018913A1 GB 9200641 W GB9200641 W GB 9200641W WO 9218913 A1 WO9218913 A1 WO 9218913A1
Authority
WO
WIPO (PCT)
Prior art keywords
hologram
light
illumination
mounting means
source
Prior art date
Application number
PCT/GB1992/000641
Other languages
English (en)
Inventor
Derk Scott Peterson
Original Assignee
Derk Scott Peterson
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 Derk Scott Peterson filed Critical Derk Scott Peterson
Publication of WO1992018913A1 publication Critical patent/WO1992018913A1/fr

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
    • G03H1/24—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
    • 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

  • This invention relates to a hologram lighting system.
  • Holograms generally require a source of illumination to reproduce images previously recorded therein. It is common practice for this light source to be located some distance from the hologram so that the light from it falls upon the hologram at a specified angle known as the reference angle.
  • the present invention provides a hologram lighting system comprising a support structure provided with hologram mounting means for mounting a hologram in a hologram support plane; an illumination means formed and arranged for providing a source of light with a small cross-sectional area; and a reflection collimator holographic optical element said illumination means and said optical element being mounted on said support structure relative to the hologram mounting means so that a divergent beam of light emanating from the light source is reflected, in use of the system, as a collimated beam of light onto a said hologram supported by said hologram mounting means for illumination thereof whereby a three dimensional image recorded in said hologram may be reproduced.
  • the hologram may be illuminated in a particularly convenient and unobstrusive manner. While at the same time providing a substantial depth of field, e.g. 100 cm or more, which is significantly greater than with known lighting systems, and with minimal chromatic dispersion.
  • the present invention provides a support structure comprising a baseboard to which the hologram to be illuminated is affixed.
  • a light source is conveniently located on one edge of this baseboard.
  • Light from this source is cast down to a holographic optical element (H.O.E.) at the opposite edge of the baseboard which is in the form of a reflection collimator.
  • the diverging light from the light source is reflected from the holographic optical element as a collimated, or nearly collimated, beam of light with a wavelength or wavelengths corresponding to the fringe structure within the holographic optical element.
  • the beam of light leaving the holographic optical element impinges on the hologram to be illuminated and causes the hologram to reproduce previously recorded information, normally as a three-dimensional image. Provision may be made in the optical system for shaping the profile of the light beam as it leaves the light source to allow improved coverage of the holographic optical element, and thereby of the illuminated hologram.
  • illumination means may be used in accordance with the present invention.
  • a simple white light illumination element such as a halogen or tungsten bulb which is inexpensive and readily available is used.
  • the source of light illuminating the holographic optical element has a relatively small cross-sectial area, and ideally is substantially point-form, in order to produce a beam from the optical element onto the hologram which is as close to parallel as possible.
  • an illumination element which is relatively small such as a small halogen bulb, having an effective cross-sectional area of less than 10 mm preferably less than 5mm, and/or the light from the illumination element may be passed through an optical system e.g.
  • a light conduit means such as an optical fibre means so as to minimise the effective cross-sectional area of the light source illuminating the holographic optical element and/or modify the shape of the beam impinging onto the holographic optical element so as to maximise the coverage and/or uniformity of light intensity cross the holographic optical element, in generally known manner.
  • Such optical systems and/or optical fibre light transmission means may also be utilised to provide a more convenient layout of system by routeing light from the illumination element to a more convenient position for the light source remote from the illumination element.
  • the illumination element could be mounted out of the way above the hologram and light routed therefrom down behind the hologram to the distal end of an optical fibre means mounted unobtrusively in proximity to the lower edge of the hologram to shine upwardly onto a reflection collimator mounted in a canopy-like arrangement projecting forwardly the upwardly edge of the hologram, to be reflected downwardly onto the hologram.
  • the hologram mounting means will be formed and arranged so as to mount the holograms in a generally upright attitude.
  • the holographic optical element will be supported at an angle thereto depending on the position of the light source and the reflecting angle of the reflection collimator to cast a beam of collimated light onto substantially the whole of the hologram.
  • the reflection collimator may be mounted generally perpendicularly to the hologram mounting plane, but may be mounted at various other angles also e.g. at an angle within the range from 45° to 135°, preferably from 70 to 110°, to the hologram mounting plane.
  • the reflection collimator may be mounted above or below, or to either side of the hologram, and the light source at a far side of the hologram remote from the reflection collimator.
  • Reflection collimator holographic optical elements are known in the art and generally comprise a holographic recording medium which has been exposed to a monochromatic laser light source which has been split into diverging beams routed so as to impinge upon the medium from opposite sides thereof to produce a series of fringes in the medium.
  • Various suitable recording media may be used including high resolution holographic silver halide film available from the Agfa Co. of Belgium, and photopolymer film. With the latter the more highly exposed portions are selectively cured into a harder form with higher refractive index producing very sharply defined fringes. Further details of holographic optical elements are described in for example, "Practical Holognphy” by Graham Saxby (1988) .
  • the present invention provides a holographic image display system comprising a hologram lighting system of the invention and a hologram mounted in the hologram mounting means of the support structure thereof.
  • Fig. 1 shows in perspective a first hologram lighting system of the invention
  • Fig. 2 is a side elevation of a secc._ ⁇ d hologram lighting system of the invention.
  • the hologram lighting system 1 comprises a baseboard support structure 2 having a generally vertically extending hologram mounting frame 3 to which a hologram 4 is affixed.
  • An illumination means comprises a small halogen light bulb 5 mounted in a lampholder 6 at the upper edge 7 of the hologram mounting frame 3.
  • Light from the light bulb 5 illuminates a holographic optical element 8 in the form of a reflection collimator mounted on a generally horizontally extending support structure portion 9 projecting forward from a lower edge 10 of the hologram mounting frame 3.
  • the holographic optical element ⁇ reflects a beam of collimated or nearly collimated light at a wavelength or wavelengths determined by the fringe spacing within the holographic optical element towards the hologram 4 causing it to reproduce from previously recorded information a three-dimensional holographic image.
  • Fig. 2 shows generally schematically and sectionally a side elevation of another embodiment of a hologram lighting system of the invention in which like parts corresponding to those shown in Fig. 1 are indicated by like reference numerals.
  • the reflection collimator holographic optical element 8 is mounted in a horizontally extending support structure portion 11 which projects from the upper edge 7 of the hologram mounting frame 3.
  • the illumination means comprises a light bulb 5 mounted in a housing 12 above said support structure portion 11 where it is substantially out of view and can benefit from natural convectional cooling, and an optical fibre means 13 routed from the light bulb 5 around the back 14 of the hologram mounting frame 3 to the lower edge 10 and terminating in a distal end 15 which provides a substantially point source of light which projects a divergent beam 16 of white light onto the reflection collimator 8. This is then reflected back down onto the hologram 4 as a substantially collimated parallel beam 17 of substantially uniform wavelength and frequency determined by the fringe spacing in the reflection collimator 8.
  • the viewer 18 is presented with a high quality three dimensional holographic image substantially free of chromatic dispersion, in an aesthetically acceptable and compact presentation without the need for any obtrusive and cumbersome lighting booms or the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

La présente invention décrit un système d'éclairage d'hologramme (1) comprenant une structure de support (2) munie d'un moyen de fixation (3) destiné à retenir un hologramme (4), un moyen d'éclairage (5) produisant une source de lumière de faible section et un élément optique holographique à collimateur réfléchissant (8). Le moyen d'éclairage (5) ainsi que ledit élément optique (8) sont montés sur la structure de support (2) par rapport au moyen de fixation de l'hologramme (3) de telle sorte qu'un faisceau de lumière divergent (16) émanant de la source d'éclairage (5) soit réfléchi, pour produire un faisceau de lumière collimaté sur l'hologramme (4) permettant l'illumination de celui-ci de manière à reproduire une image à trois dimensions enregistrée dans ledit hologramme.
PCT/GB1992/000641 1991-04-10 1992-04-10 Systeme d'eclairage pour hologramme WO1992018913A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919107580A GB9107580D0 (en) 1991-04-10 1991-04-10 Hologram lighting system
GB9107580.4 1991-04-10

Publications (1)

Publication Number Publication Date
WO1992018913A1 true WO1992018913A1 (fr) 1992-10-29

Family

ID=10692997

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000641 WO1992018913A1 (fr) 1991-04-10 1992-04-10 Systeme d'eclairage pour hologramme

Country Status (3)

Country Link
AU (1) AU1540192A (fr)
GB (1) GB9107580D0 (fr)
WO (1) WO1992018913A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107282A (ja) * 1984-10-31 1986-05-26 Toshiba Corp ホログラム再生装置
JPS62268750A (ja) * 1986-05-16 1987-11-21 Nippon Denso Co Ltd ホログラムを用いた乗り物用警報表示装置
WO1990001182A1 (fr) * 1988-07-28 1990-02-08 Crouch Stephen M Affichage d'hologrammes
JPH02182550A (ja) * 1989-01-09 1990-07-17 Mazda Motor Corp 車両用表示装置
WO1990015367A2 (fr) * 1989-06-01 1990-12-13 First Holographics Limited Ameliorations apportees a des visualisations holographiques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107282A (ja) * 1984-10-31 1986-05-26 Toshiba Corp ホログラム再生装置
JPS62268750A (ja) * 1986-05-16 1987-11-21 Nippon Denso Co Ltd ホログラムを用いた乗り物用警報表示装置
WO1990001182A1 (fr) * 1988-07-28 1990-02-08 Crouch Stephen M Affichage d'hologrammes
JPH02182550A (ja) * 1989-01-09 1990-07-17 Mazda Motor Corp 車両用表示装置
WO1990015367A2 (fr) * 1989-06-01 1990-12-13 First Holographics Limited Ameliorations apportees a des visualisations holographiques

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
APPLIED OPTICS. vol. 25, no. 22, 15 November 1986, NEW YORK US P. G. BOJ ET AL.: 'Display of ordinary transmission holograms with a white light source' *
JOURNAL OF OPTICS. vol. 21, no. 5, September 1990, PARIS FR pages 211 - 215; A. BELENDEZ ET AL.: 'Holographic collimator of diameter 200 mm in silver halide sensitized gelatin' *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 288 (P-502)(2344) 30 September 1986 & JP,A,61 107 282 ( TOSHIBA CORP ) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 149 (M-694)21 November 1987 & JP,A,62 268 750 ( NIPPON DENSO CO LTD ) *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 460 (M-1032)17 July 1990 & JP,A,2 182 550 ( MAZDA MOTOR CORP ) *

Also Published As

Publication number Publication date
AU1540192A (en) 1992-11-17
GB9107580D0 (en) 1991-05-29

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