GB2317237A - Holographic imaging using a lenticular screen - Google Patents

Holographic imaging using a lenticular screen Download PDF

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Publication number
GB2317237A
GB2317237A GB9619044A GB9619044A GB2317237A GB 2317237 A GB2317237 A GB 2317237A GB 9619044 A GB9619044 A GB 9619044A GB 9619044 A GB9619044 A GB 9619044A GB 2317237 A GB2317237 A GB 2317237A
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Application
Patent type
Prior art keywords
lenticular screen
recording medium
holographic image
object
light
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.)
Granted
Application number
GB9619044A
Other versions
GB9619044D0 (en )
GB2317237B (en )
Inventor
David Gifford Burder
Michael Medora
Original Assignee
David Gifford Burder
Michael Medora
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

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04Processes or apparatus for producing holograms
    • G03H1/0402Recording geometries or arrangements
    • G03H1/041Optical element in the object space affecting the object beam, not otherwise provided for
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005Adaptation of holography to specific applications
    • G03H1/0011Adaptation of holography to specific applications for security or authentication
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2249Holobject properties
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/16Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being a hologram or diffraction grating
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252Laminate comprising a hologram layer
    • G03H1/0256Laminate comprising a hologram layer having specific functional layer
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202Reconstruction geometries or arrangements
    • G03H1/2205Reconstruction geometries or arrangements using downstream optical component
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/28Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique superimposed holograms only
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005Adaptation of holography to specific applications
    • G03H1/0011Adaptation of holography to specific applications for security or authentication
    • G03H2001/0016Covert holograms or holobjects requiring additional knowledge to be perceived, e.g. holobject reconstructed only under IR illumination
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00Optical components
    • G03H2223/19Microoptic array, e.g. lens array

Abstract

A holographic image is produced by placing a lenticular screen between a coherant light source and a recording medium during creation of the image. The resultant image can only be observed if viewed through an identical lenticular screen, but when so observed is clearer in poor lighting conditions than a conventional holographic image. A holographic image so produced can be used without the lenticular screen attached as a security device on a credit card or, with the lenticular screen attached, for advertising or decorative purposes. The lenticular screen may have a variable pitch or pattern of different sized lenses.

Description

ImProvements <RTI>Relations</RTI> to Optical <RTI>Imagine</RTI> The present invention relates to the production of optical images and in particular 3D images produced using holography and lenticular screens.

One well known method of producing images which have a 3D or animation appearance is by the use of a lenticular screen and a stereoscopically processed composite picture. A lenticular screen consists of a corrugated sheet, for example made of plastic. Each corrugation forms an elongate convex lens. A stereoscopically processed composite picture is made up from a number of pictures of an object taken from different angles. Each picture is divided into segments and arranged alternately with segments from the other picture(s). When such a composite picture is viewed through a lenticular screen, a stereoscopic effect is achieved and an image appears in 3D.

Holography is another well known technique for producing multiview images. As is well known in the art, in order to produce a hologram, an object is illuminated with a coherent light beam, such as that from a laser. Light reflected from the object strikes a light sensitive recording medium such as a photographic film or plate. Simultaneously, a reference beam, being a portion of the light from the laser, is directed so as to bypass the object and to strike the recording medium directly. Therefore, the light incident on the recording medium is the sum of the light reflected from the object and the reference beam. When the recording medium is later illuminated by coherent light, that is a laser beam or sunlight, an observer will see a virtual image of the object which appears to exist in 3D space behind the recording medium. However, viewing the hologram in non-coherent light, such as diffused light, is less effective and the hologram will be less clearly visible.

Conventional holograms are commonly incorporated into credit cards and the like as anti-fraud devices, as well as being used for decorative and advertising purposes. However, counterfeiting of holograms to produce fake credit cards etc. is increasingly prevalent. Therefore, there is a need for an improved security device which is harder, if not impossible, to counterfeit.

The present invention provides a method for producing a hologram in which a lenticular screen is interposed between the light source and the recording medium. By this method, the holographic image which is created can only be viewed through a lenticular screen identical to that used in the production process.

However, when this type of hologram is viewed through the appropriate lenticular screen, it is easier to see than a conventional hologram in bad lighting conditions.

In conventional holography techniques, the first hologram which is produced, known as H1, is frequently used as the object to generate a second final hologram, known as H2.

In the present invention, a lenticular screen is positioned between <RTI>H1</RTI> and the recording medium on which H2 is to be created. Preferably, the lenticular screen is placed in intimate contact with the recording medium. The final H2 hologram is then created in the usual manner.

The final H2 hologram created in this way is only properly visible when viewed through a lenticular screen identical to that used in its manufacture.

Without the lenticular screen or with a different configuration of lenticular screen, the image is not visible. However, provided the correct lenticular screen is used, the image will be easier to see in bad lighting conditions than with conventional holograms.

There are a number of possible applications for holograms produced in accordance with the present invention.

First, in the field of security devices, a hologram may be affixed to a credit card, identification card or such like, or a ticket. In order to verify whether the card or ticket is genuine, it will be passed through a de-coder machine which includes a lenticular screen identical to that used in the production of the hologram. If the appropriate image is visible when the hologram is viewed through the lenticular screen, then the card or ticket is genuine.

For increased security, the hologram produced for use on, for example, identification cards of a particular institution, may be produced using a unique lenticular screen different to that used in the production of holograms for any other purpose. For example, the lenticular screen may have a variable pitch or particular pattern of different sized lenses.

A counterfeiter, in possession of the hologram but not the unique lenticular screen will be unable to view the image and, therefore, unable to reproduce it.

This is because the same hologram cannot be produced without exactly the same lenticular screen and there is no known way in which the correct form of lenticular screen can be deduced from just the hologram itself. Therefore, it is believed that a hologram made in accordance with the present invention and in the absence of its unique lenticular screen will be virtually impossible to forge.

If desired, a conventional hologram may be incorporated with a hologram made in accordance with the invention. Thus, the conventional holographic image will be ordinarily visible, but the hologram produced by the invention will be hidden and only apparent when viewed through the appropriate lenticular screen. Thus, a counterfeiter might reproduce the conventional visible hologram, unaware of the hidden image and a card or such like bearing the counterfeit hologram will be detected as a fake if viewed through a de-coder machine, because no hidden hologram would appear.

The simplest type of de-coder machine includes the appropriate lenticular screen behind which the card or ticket could be placed for visual inspection through the screen by the operator. However, a decoder machine may also comprise of video or closed circuit television system to view the hologram through the lenticular screen or may employ any other suitable form of light detecting means to check whether the hologram is genuine.

An alternative application for the invention is the production of holograms with the lenticular screen attached to or embossed onto the same piece of material which contains the holographic image, so that the holographic image is always visible and, in particular, remains visible even in poor lighting conditions in which conventional holograms would not be visible at all or only partially visible. Such a lenticular screen - hologram combination may be used for display purposes for advertising or decoration since their enhanced visibility in all lighting conditions will make the display more effective than a conventional hologram.

Claims (16)

CLAIMS:
1. A method of producing a holographic image of an object, comprising the steps of: providing a source of coherent light; illuminating an object with a first beam of light from the source; providing a second mutually coherent beam of light from the source to act as a reference beam; causing the reference beam to bypass the object; and providing a recording medium to receive light reflected from the object and to receive the reference beam, thereby to create a holographic image on the recording medium; further comprising the step of placing a lenticular screen between the light source and the recording medium such that light received by the recording medium first passes through the lenticular screen.
2. A method as claimed in claim 1, wherein the lenticular screen is placed in intimate contact with the recording medium.
3. A method as claimed in claim 1, further comprising the step of creating a second holographic image on a second recording medium based upon the first holographic image created on the first recording medium, wherein the lenticular screen is positioned between the first and second recording media.
4. A method as claimed in claim 3, wherein the lenticular screen is placed in intimate contact with the second recording medium.
5. A method as claimed in any of claims 1-4, wherein the lenticular screen has a variable pitch.
6. A holographic image produced according to the method of any of claims 1-5.
7. A holographic image as claimed in claim 6, wherein the lenticular screen is permanently affixed to the recording medium on which the image is created.
8. A holographic image as claimed in claim 6, wherein the recording medium on which the holographic image is created does not have a lenticular screen affixed thereto, such that the holographic image is only visible when observed through a lenticular screen identical to that used during production of the image.
9. Apparatus for producing a holographic image comprising light source means providing first and second beams of mutually coherent light; means to direct the first beam so as to illuminate an object; means to direct the second beam so as to bypass the object; a recording medium to receive light reflected from the object and to receive the second beam and thereby to create a holographic image; and a lenticular screen positioned between the light source and the recording medium.
10. Apparatus as claimed in claim 9, wherein the lenticular screen is in intimate contact with the recording medium.
11. Apparatus as claimed in claim 9, further comprising a second recording medium for creating a second holographic image based upon the holographic image produced on the first recording medium, wherein the lenticular screen is positioned between the first and second recording media.
12. Apparatus as claimed in claim 11, wherein the lenticular screen is in intimate contact with the second recording medium.
13. Apparatus as claimed in any of claims 9-12, wherein the lenticular screen has a variable pitch.
14. A method of producing holographic image substantially as hereinbefore described.
15. A holographic image substantially as hereinbefore described.
16. Apparatus for producing holographic image substantially as hereinbefore described.
GB9619044A 1996-09-12 1996-09-12 Holographic imaging using a lenticular screen Expired - Fee Related GB2317237B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9619044A GB2317237B (en) 1996-09-12 1996-09-12 Holographic imaging using a lenticular screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9619044A GB2317237B (en) 1996-09-12 1996-09-12 Holographic imaging using a lenticular screen

Publications (3)

Publication Number Publication Date
GB9619044D0 GB9619044D0 (en) 1996-10-23
GB2317237A true true GB2317237A (en) 1998-03-18
GB2317237B GB2317237B (en) 2001-04-18

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1077426A2 (en) * 1999-08-19 2001-02-21 Orga Kartensysteme GmbH Method for the application of visually readable information on card-shaped data carrier
US6351537B1 (en) 1998-10-05 2002-02-26 3M Innovative Properties Company Verifiable holographic article
GB2376084A (en) * 2001-05-31 2002-12-04 Holographic Image Studio Ltd Hologram viewing device with lenticular screen
EP1564605A3 (en) * 2004-02-17 2005-08-31 E.I. du Pont de Nemours and Company (a Delaware corporation) Security device using a hologram reconstructing a deep image
EP1892587A2 (en) 2006-08-22 2008-02-27 E.I.Du Pont de Nemours and Company Security hologram, method of recording same, and method of using same

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1125877A (en) * 1966-06-20 1968-09-05 Ibm Method of making a hologram
GB1222008A (en) * 1967-07-14 1971-02-10 Rlm Res Corp Photographic reproduction of pseudoscopic real image generator plates
GB1231182A (en) * 1967-05-08 1971-05-12
US3677617A (en) * 1971-05-27 1972-07-18 Battelle Development Corp Techniques of holographic data reduction utilizing an additional diffusing structure during reconstruction
US3797907A (en) * 1972-09-18 1974-03-19 Us Navy Fresnel lens scatter plate for data reduction holography
GB1384963A (en) * 1972-04-28 1975-02-26 Konishiroku Photo Ind Method of reproducing images
GB1399289A (en) * 1971-12-09 1975-07-02 Rca Corp Redundant fraunhofer recording system
US4067638A (en) * 1971-12-08 1978-01-10 Canon Kabushiki Kaisha Multi-color holographic stereograms
US4130338A (en) * 1976-08-16 1978-12-19 Rca Corporation Hologram having expanded viewing area

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1125877A (en) * 1966-06-20 1968-09-05 Ibm Method of making a hologram
GB1231182A (en) * 1967-05-08 1971-05-12
GB1222008A (en) * 1967-07-14 1971-02-10 Rlm Res Corp Photographic reproduction of pseudoscopic real image generator plates
US3677617A (en) * 1971-05-27 1972-07-18 Battelle Development Corp Techniques of holographic data reduction utilizing an additional diffusing structure during reconstruction
US4067638A (en) * 1971-12-08 1978-01-10 Canon Kabushiki Kaisha Multi-color holographic stereograms
GB1399289A (en) * 1971-12-09 1975-07-02 Rca Corp Redundant fraunhofer recording system
GB1384963A (en) * 1972-04-28 1975-02-26 Konishiroku Photo Ind Method of reproducing images
US3797907A (en) * 1972-09-18 1974-03-19 Us Navy Fresnel lens scatter plate for data reduction holography
US4130338A (en) * 1976-08-16 1978-12-19 Rca Corporation Hologram having expanded viewing area

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6351537B1 (en) 1998-10-05 2002-02-26 3M Innovative Properties Company Verifiable holographic article
EP1077426A2 (en) * 1999-08-19 2001-02-21 Orga Kartensysteme GmbH Method for the application of visually readable information on card-shaped data carrier
EP1077426A3 (en) * 1999-08-19 2002-05-02 Orga Kartensysteme GmbH Method for the application of visually readable information on card-shaped data carrier
GB2376084A (en) * 2001-05-31 2002-12-04 Holographic Image Studio Ltd Hologram viewing device with lenticular screen
EP1564605A3 (en) * 2004-02-17 2005-08-31 E.I. du Pont de Nemours and Company (a Delaware corporation) Security device using a hologram reconstructing a deep image
US7576898B2 (en) 2004-02-17 2009-08-18 E. I. Du Pont De Nemours And Company Method for using a deep image hologram as a security device and a deep image hologram
CN100557525C (en) * 2004-02-17 2009-11-04 E.I.内穆尔杜邦公司 Security device using a hologram reconstructing a deep image and hologram reconstructing a deep image
EP1892587A2 (en) 2006-08-22 2008-02-27 E.I.Du Pont de Nemours and Company Security hologram, method of recording same, and method of using same
EP1892587A3 (en) * 2006-08-22 2008-07-02 E.I.Du Pont de Nemours and Company Security hologram, method of recording same, and method of using same
US7710623B2 (en) 2006-08-22 2010-05-04 E.I. Du Pont De Nemours And Company Security hologram, method of recording same, and method of using same wherein the holographic imaging includes a single coherent beam of electromagnetic radiation in combination with a Lloyd's mirror to provide both reference and object beams

Also Published As

Publication number Publication date Type
GB9619044D0 (en) 1996-10-23 grant
GB2317237B (en) 2001-04-18 grant

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100912