EP1554890A1 - Ensemble pour projeter une image sur une surface de projection et optique de transformation associee - Google Patents

Ensemble pour projeter une image sur une surface de projection et optique de transformation associee

Info

Publication number
EP1554890A1
EP1554890A1 EP03773658A EP03773658A EP1554890A1 EP 1554890 A1 EP1554890 A1 EP 1554890A1 EP 03773658 A EP03773658 A EP 03773658A EP 03773658 A EP03773658 A EP 03773658A EP 1554890 A1 EP1554890 A1 EP 1554890A1
Authority
EP
European Patent Office
Prior art keywords
optics
transformation
projection surface
light
optical system
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Withdrawn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
EP03773658A
Other languages
German (de)
English (en)
Inventor
Christhard Deter
Jörg WUNDERLICH
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.)
LDT Laser Display Technology GmbH
Original Assignee
Jenoptik LDT GmbH
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 Jenoptik LDT GmbH filed Critical Jenoptik LDT GmbH
Publication of EP1554890A1 publication Critical patent/EP1554890A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/12—Scanning systems using multifaceted mirrors
    • G02B26/125—Details of the optical system between the polygonal mirror and the image plane
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0031—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for scanning purposes

Definitions

  • the invention relates to an arrangement for projecting an image onto a projection surface, which is built up from pixels, with at least one light source that emits a light beam, the intensity of which can be changed, and a deflection device that deflects the light beam onto the projection surface, with a two-stage transformation optics between the deflection device and the projection surface.
  • the invention further relates to optical systems for changing the angle of an incident light beam, with a two-stage transformation optics.
  • Projection systems for projecting colored images are known from the prior art.
  • the image sources are e.g. Computer generated images or video sources are available. Different projection technologies are used.
  • DE 43 26 899 A1 describes a projection system which is used for
  • Color imaging uses three CRTs, one each for the primary colors red, green and blue.
  • the images generated on the surfaces of each of the CRTs are imaged by an imaging optical system on a projection surface and superimposed there.
  • US Pat. No. 5,321,499 A also describes a projection system with three CRTs, the three partial images of which are superimposed by dichroic mirrors, so that only one optical system still images on the projection surface.
  • the observer standing between the projector and the projection surface can use the
  • a projection lamp is used for image generation in cooperation with an illuminated LCD matrix for image modulation.
  • the LCD matrix is in turn imaged on the projection surface by an imaging optical system with an opening whose size is in the range of several centimeters.
  • EP 0 734 184 A2 describes a projection system which works with three LCD matrices which are operated in reflection.
  • is one of the laws of Enough projection optics are necessary, which, in order to provide correspondingly bright images, must also be dimensioned correspondingly large in diameter.
  • Image modulation uses three reflecting mirror matrices.
  • an imaging optical system is used for projection onto the projection surface, the free light emission of which is between 5 cm and 10 cm in size.
  • Such a projector is referred to in the context of this invention as a laser projector.
  • the novel optical system described there is not used to magnify an internal small primary image generated in the projector, but rather to enlarge or reduce the deflection angles of the scanned laser beams in the horizontal and vertical directions that enter the optical system.
  • the technical requirements for the optical system for changing the deflection angle are essentially: enlargement of the angle, depth of field, geometric and chromatic aberrations, transmission.
  • the size of the opening of the angle-changing optics is also typically in the range between 5 cm and 10 cm.
  • Projection systems on a reflected light projection surface is the projector in relation to the one or the
  • the observer has one or more optical systems in his field of vision from his usual position.
  • scattered light is generated in any case, reinforced by dust and dirt particles.
  • This stray light is distracting when viewing the projected image.
  • the object of the invention is a projection arrangement in which an observer
  • the object is achieved by an arrangement for projecting a color video image composed of pixels onto a projection surface, the arrangement comprising at least one light source which emits a light beam and whose intensity can be changed, a deflection device which deflects the light beam onto the projection surface and has a two-stage transformation optics, which is arranged between the deflection device and the projection surface and consists of two subsystems of positive refractive power, and wherein, in
  • the entrance pupil lies in front of the first lens vertex of the transformation optics and the exit pupil of the transformation optics lies between the lens vertex of the last lens of the transformation optics and the projection surface, and a diaphragm is arranged in the exit pupil. Due to the position of the exit pupil and the arrangement of the diaphragm in it, an observer cannot perceive any scattered light.
  • the comparatively small aperture serves as a point of passage for the light beam that writes the picture.
  • the solution according to the invention can be used for any type of projections which are expanded with a writing light beam.
  • a light source that emits laser radiation is particularly advantageous.
  • Projectors that work with laser radiation are also known as laser projectors.
  • the solution according to the invention has advantages above all where the observer must simultaneously look in the direction of the projector in order to observe the projected image.
  • the diaphragm Seen in the direction of light propagation, the diaphragm is arranged after the last lens apex of the transformation optics.
  • the aperture is typically 1 cm to 50 cm after the last lens apex, so that almost all structural conditions that a projection system requires can be met.
  • the diaphragm can also be applied directly to the surface of the last optical surface of the transformation optics, as seen in the direction of light.
  • the aperture is part of a housing of the transformation optics.
  • the lenses of the transformation optics are contained in the housing.
  • At one end of the housing is the mechanical connection to a biaxial deflector.
  • At another end of the housing is the diaphragm, which represents the light exit for the deflected light beam.
  • the distance of the diaphragm from the last lens apex is advantageously less than 5 cm.
  • Another embodiment of the invention is that the screen is integrated in the surface of a wall and the transformation optics with the associated biaxial deflection device is positioned to the screen in the wall.
  • the position of the aperture in the Projection area is thus designed so that there is a minimum possible diameter
  • a further development of the invention consists in that the wall forms the projection surface with one side, the projector with its transformation optics is arranged on an opposite side and the diaphragm is incorporated into the projection surface.
  • This arrangement is particularly in the case of a cylinder projection or a
  • the transformation optics can be corrected for a distortion-free mapping (or directory-free).
  • a correction can, depending on the application, for. B. after the tangent condition, which is described in more detail in DE 43 24 849 A1, or the angular condition.
  • the correction according to the angular condition is particularly advantageous when projecting onto a cylindrical or spherical projection surface.
  • transformation optics for a projection in a spherical surface for a projection in a spherical surface
  • Transformation optics designed so that the entrance angle and exit angle of the incident or emerging light bundle are directly proportional to each other. This means that when projecting from the center of a spherical dome, e.g. B. from the center of a planetarium, a Cartesian test pattern (chess board) can be projected without geometric distortion.
  • an optical system for changing the angle of an incident light bundle is provided, with a two-stage transformation optics, which consists of two subsystems of positive refractive power, which, viewed in the direction of light propagation, are arranged one behind the other, the ratio of the refractive power of the subsystems to the angular magnification of the deflected one
  • Beam bundle is determined and the arrangement of the lenses in the second subsystem is selected so that - seen in the direction of propagation of light - the exit pupil of the transformation optics lies between the vertex of the last lens of the transformation optics and the projection surface and a diaphragm is arranged in the exit pupil.
  • Exit pupil provides the advantages of the invention described above.
  • the optical system or the diaphragm can be further developed in the same way as in the arrangement according to the invention described above.
  • the transformation optics can be corrected for distortion-free imaging. Such a correction can, for example, again be carried out according to the tangent condition or the angular condition.
  • an optical system for changing the angle of an incident light bundle is provided, with a two-stage optical system for angular transformation, the exit pupil of which lies within the lenses of the optical system, a relay optical system consisting of two subsystems of positive refractive power, seen in the direction of light propagation, behind the optical system Angular transformation is arranged, the arrangement of the lenses in the second subsystem of the relay optics is chosen so that, seen in the direction of propagation of the light, a
  • Exit pupiUe the relay optics between the lens vertex of the last lens of the relay optics and the projection surface, and wherein a diaphragm is arranged in the exit pupil of the relay optics.
  • the relay optics do not change the amount of the angles of the light beams entering and leaving them, only the sign (the original light is reversed and upside down).
  • the use of the relay optics is particularly advantageous when existing optics for angular transformation are combined with the relay optics and the aperture, so that with the
  • the two-stage optics for angular transformation can be corrected for distortion-free imaging. This correction can, depending on the application. B. after the
  • optical system or the diaphragm can be further developed in the same way as in the arrangement according to the invention described above.
  • the invention is explained in more detail below by way of example with reference to the figures. Show it
  • Fig. 1 Arrangement of a projection system in a dome according to the prior art
  • FIG. 2 arrangement of a projection system according to the invention, FIG. 3 transformation optics according to the invention, FIG. 4 optics for angular transformation according to the prior art with an additional relay optics according to the invention, FIG. 5: schematic of a relay optics, FIG. 6: projector with a transformation optics, according to the invention with a built-in bezel.
  • FIG. 1 shows a projection system for image display in a projection dome 101 with four projectors 105 (three are shown in the figure) according to the known prior art.
  • the four projectors 105 are laser projectors, each with transformation optics 109. They generate four images which are put together on a projection surface 121 of a wall 103 of a dome in such a way that a holistic image is produced.
  • the observer 108 of the image is seated inside the projection dome 101 on a spectator stand 102, in the example below an equatorial plane 104.
  • the projectors 105 are arranged in relation to the wall 103 of the dome so that the dome is offset by 90 ° behind the equatorial plane, as seen by the observer the wall 103 are arranged in a plane 106.
  • openings 103 are provided in the wall 103 which are dimensioned so large that no image cropping takes place.
  • one of the projectors 105 ' is arranged such that its transformation optics 109 ' protrude into the opening 107 'of the wall 103.
  • the observer 108 can look directly at a light exit opening of the transformation optics 109 ' when viewing the image in the projection dome 101.
  • Breakthrough is connected, which is shown in FIG. 1 as an example using the projector 105 "with its transformation optics 109 " and the comparatively larger breakthrough 107 ".
  • the observer sends the same disturbing image information to the
  • FIG. 2 shows the projection system according to the invention for displaying images in the projection dome 101 with four projectors 105 (three are shown in the figure).
  • the four projectors 105 are laser projectors, each with a transformation optics 109 according to the invention.
  • the use of laser projectors, i. of projectors that work with a biaxially deflected light bundle is a prerequisite for the diameter of the openings 107 in the wall 103 to be minimized.
  • the laser projectors consist of a projector 105 with a biaxial deflection device 112 and the transformation optics 109 as well as a light source 122.
  • a single light source 122 is set up away from the location of the four projectors 105 and via electrical ones
  • optical fiber connections 123 Such laser projectors are described for example in DE 43 24 848 C1.
  • RGB laser as the light source 122
  • four spatially combined and intensity-modulated red-green-blue light bundles are generated, and with each projector 105 colored images are projected, which are combined on the projection surface 121 to form an overall image.
  • one light source 122 can also be installed in each of the projectors (not shown).
  • the projectors 105 are here - as seen by the observer 108 - behind the wall 103 of the dome so that an exit pupil AP of each transformation optics 109 lies within the openings 107.
  • the breakthroughs here have the function of one
  • the opening (free diameter for the beam path of the projection light) is typically between 1 and 10 mm, depending on the angle enlargement and the beam diameter of the incident light bundle 113. Compared to the free diameter of known projection optics, this is a factor of 10 to 100 smaller.
  • the diaphragm does not provide any scattered light, so that the observer 108 does not perceive any light at this point when looking at the opening 107.
  • the breakthrough with the optical function of a diaphragm when the observer is in the usual position, also prevents the observer 108 from looking at the last lens vertex of the transformation optics, as seen in the direction of light propagation. This is not the case only if the observer is positioned so that he has his eye point near or in the main projection beam 110 of the projector 105. However, this position is practically excluded due to the risk of harmful radiation.
  • Projectors can now also be arranged within the projection dome 101 without the observer 108 noticing a noticeable disturbance in the image information.
  • FIG. 3 shows the optical diagram of the transformation optics according to the invention, which is used in an arrangement according to FIG. 2.
  • Numbers 1 to 14 denote the optical surfaces.
  • a first subsystem has the optical surfaces 2 to 6 and a second subsystem has the optical surfaces 7 to 13.
  • a transformation optic with an angular magnification of two has the following structure, for example:
  • the optical system consists of two subsystems with positive refractive power.
  • the ratio of the refractive powers determines the angular magnification of the deflected beam.
  • the transformation optics are color corrected for the wavelengths of the light bundles 113, 114 in the three primary colors red, green and blue and are suitable for color image display.
  • the biaxial deflection device 112 is positioned at a distance of 40.936 mm in front of the lens apex of the optical surface 2, which deflects the incident light bundle 113 in the line direction and image direction.
  • the stage of the transformation optics 109 is formed by the optical surfaces 2 to 7.
  • Deflected light beams 114 generate an intermediate image in an intermediate image plane ZBE, which lies between the first optical system and a second optical system.
  • the second optical system is determined by the optical surfaces 7 to 13.
  • the two optical systems are dimensioned such that an exit pupil AP (area 14) of the overall system
  • the diaphragm 111 is arranged, the diameter of which is selected to be so large that none of the deflected light bundles 114 is cut off.
  • the incident light beam 113 has a beam diameter of 5 mm and the diaphragm 111 has a free diameter of 2.7 mm and an angular acceptance of the deflected light beam of +/- 10 °.
  • the correction factor here is 1.08 and takes into account the divergence of the light beam and the fact that the entrance pupil EP in the biaxial deflection device 112, which consists of two deflecting mirrors attached to one another for each of the axes, only at one location on one of the mirrors or between the mirrors (see also Fig.
  • the projection surface 121 is only indicated, since it is arranged several meters from the aperture 111.
  • a relay optic 116 is assigned to a known optic for angular transformation 115, which is corrected according to the tangent condition, for example according to DE 43 24 849 A1.
  • the relay optics 116 - as seen in the direction of propagation of the light - to the optics for angular transformation 115 are arranged such that the exit pupil of the optics for angular transformation AP ⁇ is equal to the entrance pupil of the relay optics EP Re ⁇ .
  • These pupils are located here at a location within the lens optics for angular transformation 115.
  • the two-axis deflection device 112 is located at the location of the entrance pupil EP WT of the optics for angular transformation 115.
  • the relay optics 116 is used for pupil transformation and is here only as a replacement system with theirs
  • the relay optics 116 shifts the step pupil AP W ⁇ of the optics for the angular transformation 115 to the location of the diaphragm 111.
  • the diaphragm 111 is incorporated into the wall 103, which forms the projection surface 121.
  • the use of relay optics 116 for pupil transformation has the advantage that conventional optics for angular transformation for applications in the planetarium or simulator
  • FIG. 5 shows relay optics 116, which is calculated for a monochrome light beam.
  • the angular acceptance of the relay optics is a maximum of +/- 30 ° in relation to the deflected light bundle 114.
  • the diameter of a collimated light bundle is typically in the range between 1 mm and 10 mm.
  • the entrance pupil of the relay optics EP Re ⁇ lies 32.73 mm in front of the first lens apex 2 of the
  • An upstream optic (not shown) for angular transformation has its exit pupil AP W ⁇ at this point.
  • the exit pupil of the relay optics AP Re ⁇ lies 32.73 mm after the last lens apex surface 17 of the relay optics 116.
  • the aperture 111 is arranged in this location. Since the amount of the angular magnification of the relay optics is one, the diameter of the diaphragm is a few tenths of a millimeter larger than the diameter of the collinear deflected light bundle 114.
  • the biaxial deflection device 112 consists of a polygon scanner 117 and a
  • Galvanometer scanner 118 A housing of the deflection device 119 has a mechanical connection for a housing of the transformation optics.
  • the entrance pupil EP of the transformation optics 109 is here close to the axis of rotation of the galvanometer scanner 118.
  • the beam deflection of the polygon scanner does not take place in the entrance pupil, which results in a beam deformation, an elliptical beam profile.
  • the aperture is therefore a factor
  • the aperture 111 is installed in a housing 120 of the transformation optics 109.
  • the housing 120 is here in the opening 107 and protrudes through the wall 103.
  • a projector can also be set up freely in a room in which it is being projected and then also has exactly the advantages described above.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Lenses (AREA)

Abstract

L'invention concerne un ensemble pour projeter une image sur une surface de projection, constituée de pixels, ledit ensemble comportant : au moins une source de lumière d'intensité variable, émettant un faisceau lumineux, et un déflecteur qui dévie un faisceau lumineux sur la surface de projection, ainsi qu'une optique de transformation, à deux étages, située entre le déflecteur et la surface de projection. L'invention concerne également des systèmes optiques servant à faire varier l'angle d'un faisceau lumineux incident, comportant une optique de transformation à deux étages. L'invention est caractérisée en ce que : l'optique de transformation (109) est constituée de deux systèmes partiels présentant un indice de réfraction positif; en ce que, vu dans le sens de propagation de la lumière, la pupille d'entrée (EP) est placée en amont du premier sommet (2) de la lentille de l'optique de transformation (109), et la pupille de sortie (AP) de l'optique de transformation est située entre le sommet de la dernière lentille (14) et la surface de projection (121); et en ce qu'un diaphragme (111) est placé dans la pupille de sortie (AP).
EP03773658A 2002-10-22 2003-10-21 Ensemble pour projeter une image sur une surface de projection et optique de transformation associee Withdrawn EP1554890A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10249338 2002-10-22
DE10249338A DE10249338A1 (de) 2002-10-22 2002-10-22 Anordnung zum Projizieren eines Bildes auf eine Projektionsfläche und zugehörige Transformationsoptik
PCT/EP2003/011653 WO2004039084A1 (fr) 2002-10-22 2003-10-21 Ensemble pour projeter une image sur une surface de projection et optique de transformation associee

Publications (1)

Publication Number Publication Date
EP1554890A1 true EP1554890A1 (fr) 2005-07-20

Family

ID=32114832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03773658A Withdrawn EP1554890A1 (fr) 2002-10-22 2003-10-21 Ensemble pour projeter une image sur une surface de projection et optique de transformation associee

Country Status (5)

Country Link
US (1) US7347567B2 (fr)
EP (1) EP1554890A1 (fr)
AU (1) AU2003282043A1 (fr)
DE (1) DE10249338A1 (fr)
WO (1) WO2004039084A1 (fr)

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Also Published As

Publication number Publication date
AU2003282043A1 (en) 2004-05-13
US7347567B2 (en) 2008-03-25
DE10249338A1 (de) 2004-05-19
WO2004039084A1 (fr) 2004-05-06
US20050264879A1 (en) 2005-12-01

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