EP0065954A1 - Dispositif de projection d'images reelles - Google Patents

Dispositif de projection d'images reelles

Info

Publication number
EP0065954A1
EP0065954A1 EP81902496A EP81902496A EP0065954A1 EP 0065954 A1 EP0065954 A1 EP 0065954A1 EP 81902496 A EP81902496 A EP 81902496A EP 81902496 A EP81902496 A EP 81902496A EP 0065954 A1 EP0065954 A1 EP 0065954A1
Authority
EP
European Patent Office
Prior art keywords
light
angle
image
ray
normal
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Withdrawn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
EP81902496A
Other languages
German (de)
English (en)
Inventor
Michiel Kassies
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.)
KASSIES Michiel
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 EP0065954A1 publication Critical patent/EP0065954A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/125—Stereoscopic displays; 3D displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a three-dimensional [3D] volume, e.g. voxels
    • G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a three-dimensional [3D] volume, e.g. voxels by projecting aerial or floating images
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/12—Signs, boards or panels, illuminated from behind the insignia using a transparent mirror or other light reflecting surface transparent to transmitted light whereby a sign, symbol, picture or other is visible only when illuminated

Definitions

  • An objact of this invention is to disclose the projaction of an image utilizing the raflected light from an objact such as that seen in the real world.
  • the object is conventionally illuminated, for example either by front illumination in the case of an opaque object or by rear illumination in the case of a translucent object.
  • Light from the object is projected through a symmetrical imaging device.
  • the symmetrical imaging device has a reference plane where light incident upon the device has its direction changed and the light with changed direction is transmitted from the device. All points on the reference plane are active over the surface of the reference plane in accordance with the following rule.
  • the symmetrical imaging device relative to the reference plane has optical properties restricting the transmitted ray from the symme trical imaging device to a normal plane containing the incident ray and the normal to the reference plane to the point of i ⁇ oidanca.
  • the angle of incidence is equal to the angle of transmission but is contained an tne same side of the normal (where the angle of incidence is the angle between the incident light ray and a normal and the angle of transmission is the angle between the reflected light ray and a normal).
  • the devices can be used for the multiple functions usually performed by lenses and parabolic mirrors.
  • a further object o f this inventions is to disclose a screen far transmitting from one side of the screen an image of an object to the opposite side of the screen. This is previously called the deflective form of the device.
  • the image from the device is a precise reciprocal of the object of the device. for example, an image of what is essentially a convex human contour would appear reciprocally as an image of a concave human contour.
  • An advantage of this invention is that tha image, unlike that pro ⁇ duced through a positive spherical lens or parabolic mirror, is at the same distance from the retroimaging device as the object whan the refaranca plans is reflected.
  • a further advantage is that by using reciprocal objects, one can cast an image of a real world object. For example, by imaging the concave features of the human mask, one can image with reverse parity the exterior of a human face.
  • a further function of one part of this invention is to adopt a beam splitter to a retroreflecting screen to the casting of such images.
  • the beam splitter is placed at an angle between an illuminated object and a retroreflecting screen.
  • Light imainging upon the beam splitter from the retroreflecting screen is detoured outwardly and away from the screen path back to the object. Being so detoured, a reciprocal image is formed.
  • the formed reciprocal image may then be viewed as being real, and out in space in front of the viewer.
  • Fig. 1 is a three-dimensional view of the projection device in this invention utilizing a retroreflecting screen and beam splitter to create a specular reciprocal image of the letters "ABC";
  • fig. 2 is a side perspective view of fig. 1 illustrating the property of the invention whereby the image is thrown some distance from the projection device;
  • fig. 3 is an embodiment of this invention si.milar to fig. 1, the embodiment therein illustrating a retroprojection device, which retroprojection device throws the reciprocal of the letters to a new location;
  • figs. 4, 5, 6. are all embodiments of specialized screens which can be used with the embodiment of fig. 3;
  • fig. 7 is an embodiment of the invention wherein two symmetrical imaging devices ara used so as to project the image of the object (leftmost face) into space so that the image (rightmost face) appears the same as the object.
  • an object 100 is illuminated by a light source 99 which light source is only schematically shown.
  • the object happens to be transparent or translucent. The light thus can be projected from the rear thereof.
  • the light from the object passes to a retroreflecting screen 20 mounted an the base of a three-sided box 22.
  • Light from the retroreflecting screen returns directly to the object 100.
  • a retroreflecting screen returns the light, impinging upon it with the precise angularity as the light is received from an object.
  • Interposition of the beam splitter 24 at a preferred 45 degree angle changes this.
  • the beam splitter causes at least some of the converging light to be detoured to an image plans 101.
  • the image of the object (here shown as the letters "ABC") is recreated.
  • the retroreflecting screen could be mounted on the and wall 25 of the box 22.
  • a viewer of the imaga 101 such as that schematically shown by the eye 30 would in fig. 2 have a bright and illuminated back - ground against which to view the image.
  • a bright and illuminated background would detract from the intensity of the image it is usually preferred to mount the retroreflecting screen 20 so that the viewer has light passed to his view with a relatively dark background.
  • end wall 25 is painted with a dark, light absorbative coating such as non-glossy black paint and the like. It is also important to distinguish this invention from that of the conventional law of reflection. Taking the case of a retroimaging screen, it will be understood that the screen has a theoretical reference plane in which light changes its direction. This screen has optical properties restricting the transmitting ray to the retroreflecting screen to a normal plane containing the incident ray and the normal to the reference plane within the screen at the point of incidence.
  • the angle of incident is equal to the angle of transmission, but is contained an the same side of the normal.
  • the angle of incidence is defined as the angle between the incident light ray and a normal and the angle of transmission or reflection is defined as the angle between the reflected ray and a normal.
  • a light source 103 illuminates an object in the farm of letters ABC deflective is a projection.
  • a device 104 is illustrated.
  • the property of device 104 is exactly similar to that of the retroreflecting screen 20. Specifically, reflected or emanating light will diverge from each point on object
  • the construction of the projection device 104 can take several forms, which forms can all ba easily understood with reference to Figs. 4, 3, and 5,
  • a device 106 consisting of glass bead lenses 40 aligned in a matrix 41 in one side of screen 50 and glass bead lenses 50 aligned in a matrix 51 an the opposite side af screen 50.
  • a rear projection screen 50 sits intermediate the lens matrixes 41, 51.
  • the resulting projection system is easy to understand. Specifically, light from all angles is imaged through matrix 41 onto the rear projection screen 60. At the rear projection screen 60, the light is then seen by the matrix of lenses 51 and each individual lens 50 causes light to emanate from the rear side of the rear projection screen 60 with the exact same and precise angularity as the light was received. There will result a recreation of the images as described. The same effect can be produced using pinholes.
  • a device utilizing pinholes is illustrated in Fig. 5.
  • a rear projection screen 60 is shown having a series of individual pinh ⁇ las 42 aligned in a matrix 43. Conversely and at the opposite side there are pinholes 52 aligned in a matrix 53. The result is the same. Specifically, light enters and forms an image on the rear projection screen 50. This image is seen at each of the pinholes with the light exiting through the pinholes. The angularity assigned to an outgoing ray is the reciprocal of the light to an incoming ray. Therefore, an image can be formed in themanner illustrated in Fig. 3.
  • a matrix of positive spherical lenses 51 is illustrated, each lens is aligned between paired pinholes 44 towards the object and 54 towards the image.
  • these respective lenses 61, pinholes 44, 54 are aligned in respective matrixes, 45, 55.
  • the separation between the matrix of pinholes 45 and the matrix of pinholes 55 is chosen to be the exact focal length of each of the lenses 61 of the lens matrix 65.
  • FIG. 5 will produce a symmetry imaging characteristic such as that previously illustrated.
  • Each device has a plane where the light changes direction.
  • the symmetrical imaging device relative to its reference plane has optical properties restricting the transmitted ray from the symmetrical imaging device to a normal plans containing the incident ray and the normal to the reference plane at the point of the incidence.
  • the angle of incidence is equal to tha angle of transmission, but is contained on tha same side of the normal.
  • the angle of incidence is the angle between the incident light ray and the normal and the angle of transmission is the angle between the transmitted ray and a normal,
  • transmission of a light image of the object occurs from one sids of the device to the opposite side of the device, it will be seen that there results an image.
  • the images created are not those conventionally created by spherical lenses.
  • the imaga is to ba distinguished frcm any illuminated object merely placed in front of a retroreflecting screen, where an illuminated object is placed in front of a retroreflecting screen, an imags of that object is cast right back precisely upon the object itself.
  • the image of the object must be cast somewhere other than back upon the ⁇ bjact itself. It is the realization that the image exists that is one of the important aspects of this invention.
  • a symmetrical imaging device for transmitting an image is shown.
  • An object 107 hers in the form af the human face, is placed on one side of a first transmission device 108. It casts a reciprocal image in the form of a mask 109 on the opposite side thereof. The image of mask 109 is then taken by a second image transmission device 110.
  • This image transmission device forms an image of the human face at 111. It can ba seen that with the above- described reciprocal imaging device, the device of the face may be reproduced. It is seen that as the object 107 is moved toward the right the imaga 111 will also move toward the right. Further, both object and image will move at the same speed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Optics & Photonics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)

Abstract

La lumiere reflechie ou emanant d'un objet est projetee au travers d'un dispositif a image symetrique. Le dispositif a image symetrique contient un plan de reference (24, 60, 65) ou la direction de la lumiere venant heurter ce plan de reference est changee ou modifiee. Le dispositif a image symetrique par rapport au plan de reference ou de symetrie possede des proprietes optiques (20, 43, 45) limitant le rayon transmis par le dispositif a image symetrique pour rester dans un plan normal contenant le rayon incident et la normale au plan de reference au point d'incidence. L'angle d'incidence est egal a l'angle de transmission, mais il est contenu du meme cote de la normale (ou l'angle d'incidence est l'angle entre le rayon de lumiere incident et la normale, l'angle de transmission est l'angle entre le rayon de lumiere reflechi et la normale). En ce qui concerne l'aspect de retro-reflexion de cette invention, chaque rayon de lumiere est reflechi exactement sur lui-meme avant ou apres reflexion speculaire de ce rayon de lumiere par un milieu partiellement transparent dont la surface coincide generalement avec le plan de reference susmentionne. En ce qui concerne la forme de deflexion de la lumiere de l'invention qui utilise soit la deflexion soit la reflexion soit une combinaison de ces aspects de transmission, le dispositif possede une forme plane (108, 110) plutot qu'une forme de boite et la lumiere provenant d'un objet d'un cote du dispositif est projetee sur le cote oppose du dispositif plutot que lateralement par rapport au dispositif dans les deux cas. Dans l'un ou l'autre des cas, la lumiere projetee par le dispositif forme des images d'objets dans l'espace. Dans le cas d'un dispositif a retro-reflexion, la lumiere doit etre deviee par un diviseur de rayons, pour produire une image symetrique capable d'avoir des qualites dimensionnelles.
EP81902496A 1980-08-29 1981-08-12 Dispositif de projection d'images reelles Withdrawn EP0065954A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18255080A 1980-08-29 1980-08-29
US182550 1980-08-29

Publications (1)

Publication Number Publication Date
EP0065954A1 true EP0065954A1 (fr) 1982-12-08

Family

ID=22668951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902496A Withdrawn EP0065954A1 (fr) 1980-08-29 1981-08-12 Dispositif de projection d'images reelles

Country Status (8)

Country Link
EP (1) EP0065954A1 (fr)
AU (1) AU7536581A (fr)
BE (1) BE890123A (fr)
CA (1) CA1163481A (fr)
IT (1) IT1143424B (fr)
MX (1) MX152353A (fr)
WO (1) WO1982000911A1 (fr)
ZA (1) ZA815690B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9415894D0 (en) * 1994-08-05 1994-09-28 Central Research Lab Ltd An apparatus for displaying an image
DE102008022011A1 (de) 2008-05-02 2009-11-05 Becker, Stefanie Vorrichtung zur virtuellen Darstellung einer Lichtquelle sowie Verwendung dieser
CN101907955B (zh) * 2010-06-29 2012-11-21 苏州佳世达电通有限公司 光学式触控面板
DE102012105170B3 (de) 2012-06-14 2013-09-26 Martin Göbel Vorrichtung zur Erzeugung eines virtuellen Lichtabbilds

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191000378A (en) * 1910-01-06 1911-01-06 Fernand Sauvage Improvements in Optical Projection Apparatus.
GB248276A (en) * 1925-09-19 1926-03-04 Thomas Sapp Improvements in and relating to signs
GB768394A (en) * 1954-01-07 1957-02-13 Henri Albert Alekan Improvements in and relating to apparatus for taking composite pictures by photography or television
US3200702A (en) * 1962-08-15 1965-08-17 Itt Stereoscopic projection apparatus
US4168900A (en) * 1978-04-24 1979-09-25 Minolta Camera Kabushiki Kaisha Compact erect optical imaging copier system and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8200911A1 *

Also Published As

Publication number Publication date
IT8149184A0 (it) 1981-08-27
BE890123A (nl) 1981-12-16
AU7536581A (en) 1982-04-08
IT1143424B (it) 1986-10-22
ZA815690B (en) 1982-06-30
CA1163481A (fr) 1984-03-13
WO1982000911A1 (fr) 1982-03-18
MX152353A (es) 1985-07-02

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19820914

AK Designated contracting states

Designated state(s): CH DE FR GB LI NL SE

RBV Designated contracting states (corrected)

Designated state(s): CH DE FR GB LI NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: KASSIES, MICHIEL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860102