EP2817967A1 - Tête de projection pour un projecteur laser - Google Patents

Tête de projection pour un projecteur laser

Info

Publication number
EP2817967A1
EP2817967A1 EP13705980.4A EP13705980A EP2817967A1 EP 2817967 A1 EP2817967 A1 EP 2817967A1 EP 13705980 A EP13705980 A EP 13705980A EP 2817967 A1 EP2817967 A1 EP 2817967A1
Authority
EP
European Patent Office
Prior art keywords
projection head
head according
lens
fiber
fibers
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Withdrawn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
EP13705980.4A
Other languages
German (de)
English (en)
Inventor
Wolfram Biehlig
Andreas Zintl
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
LDT Laser Display Technology 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 LDT Laser Display Technology GmbH filed Critical LDT Laser Display Technology GmbH
Publication of EP2817967A1 publication Critical patent/EP2817967A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • 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
    • G02B26/124—Details of the optical system between the light source and the polygonal mirror
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/104—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with scanning systems
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source

Definitions

  • the invention is concerned with a projection head for a laser projector, but in particular with the fiber extraction at a relatively large distance between the fibers, so with a new concept, the optical properties of the projector head with scanning laser projection improving.
  • a fiber decoupling is presented, with which there are advantages over previous solutions with fiber duo. It represents a possibility to be able to adjust the position of the crossing point between the light beams. So it is possible to place the crossing point on the polygon facets of a polygon (mirror). As a result, only lower light losses occur and edge discoloration when projecting onto a projection surface is reduced.
  • the lateral distance between the fibers is relatively large and is a few millimeters. Due to the large distance, it is possible to integrate additional adjustment aids and to use conventional fiber connectors for single fibers.
  • the light is transported from a laser source to the projection channel via an optical fiber.
  • the image quality is decisively determined by the optical design in the area between the end of the fiber duo and the biaxial scanner.
  • the divergent bundles of rays emerging from both light fibers are collimated by a collimation lens.
  • This beam offset leads to deterioration of the image quality.
  • the inhomogeneity of the brightness distribution in the image increases.
  • it can lead to edge discoloration.
  • the aperture eliminates much of the scattered light.
  • FIG. 12 "Prior Art”, such a known arrangement of the embodiment of the fiber outcoupling for a fiber duo according to the prior art is shown.
  • the laser projector the light from the laser source to the projection channel via optical fibers 100, 101 transported.
  • a collimating lens 102 collimates the diverging beams emerging from the two optical fibers 100, 101.
  • different points of impact occur on the polygonal facet mirror 104.
  • DE 10 2004 001 389 A1 discloses an arrangement and a device for minimizing edge discoloration in video projectors.
  • an image is projected onto a projection surface, which is composed of pixels.
  • the arrangement comprises at least one light beam emitting, variable in intensity light source and a Jus- day device after a fiber, containing an optical delay for symmetrizing the light beam, and a subsequent deflection.
  • the method and device for projecting an image onto a projection surface from DE 10 2008 063 222 A1 builds on a fiber of DE 10 2004 001 389 A1 and proposes to construct the deflection device with a scanner unit and suitable deflection mirrors. Furthermore, the deflection unit comprises fixed or movably arranged dichroic mirrors, etc., as well as optionally a diaphragm system.
  • DE 10 2007 019 017 A1 discloses a further method and a further apparatus for projecting an image on a projection surface, which is constructed from pixels, with at least one, an intensity changeable light source emitting a light beam and a coupling device after the fiber and a subsequent deflection device which directs the light beam onto the projection surface.
  • DE 601 24 565 T2 presents a raster laser projection system in which narrow neighboring light-conducting bundles are used in order to be able to scan several lines simultaneously on the projection screen.
  • the fiber ends are imaged by an optic on the projection screen.
  • the different primary color components red, green, blue
  • the colored points of light red, green, blue
  • three or more optical fibers are used.
  • One or more points on the projection surface must be irradiated sequentially or simultaneously by different scans within an image in order to superimpose on the projection surface the points of light emerging from the different optical fibers of the fiber bundle.
  • the possible structure of the optics after the fiber is not explained in detail.
  • the object of the invention is to improve the properties of a projection head with a simple construction, so that the image quality is also improved.
  • the invention is based on the basic idea of crossing the collimated beams on the polygonal facet mirror (intersection point), with the diaphragm also being brought to a better position without impairing the functionality in any way.
  • the known collimating lens is replaced by new decoupling systems.
  • a first converging lens produces a focal point of the beams of at least two fibers which are inclined and relatively far apart from each other, in the vicinity of the focal plane of a second converging lens, which collimates these beams.
  • the beams In front of the focal plane of the second convergent lens (focusing lens), the beams intersect.
  • This crossing point is imaged by the second convergent lens (collimation lens) in the plane of the polygon facet where then a second crossing point lies.
  • a lens hood is located at the first crossing point.
  • the proposed coupling optics (decoupling system or decoupling device) consists in a first embodiment only of converging lenses.
  • the coupling-out optics consists of a combination of collecting and diverging lenses. Due to the greater fiber spacing selected, each fiber has its own focusing or converging lens. Each of the lenses is in practice representative of a lens group. This is necessary so that the necessary corrections (color aberration, astigmatism, etc.) can be realized.
  • 1 shows a first variant with at least three fibers and converging lenses
  • Fig. 2 shows a further variant with at least three fibers and a combination of
  • FIG. 4 is a projected image corresponding to FIG. 3c.
  • FIG. 4 is a projected image corresponding to FIG. 3c.
  • FIG. 6 shows a basic structure of the variant in Fig. 2 with representation of the beam centers
  • FIG. 7 shows the structure in FIG. 6 with a representation of the beam diameter
  • FIG. 9 shows an axial view of a coupling-out group with a segmented mirror and nine fibers
  • FIG. 10 is a side view of a coupling-out of FIG. 9,
  • Fig. 1 1 is a representation of a fiber with adjustment aids.
  • FIG. 1 shows a first decoupling electronics 1 1 of a projection head not shown in detail with three spaced-apart fibers 1, 2, 3, which are aligned by means of associated apertures 12, 13, 14 and behind lenses 15, 16, 17 that a real Junction point Ki in front of the focal plane of a common further lens 18 (collimator lens) is located.
  • the illustrated lenses 15-17 (Fig. 1, Fig. 2) are in practice representative of a lens group, which is necessary if necessary corrections (color aberration, astigmatism, etc.) should be realized.
  • Each fiber 1, 2, 3 has its own converging lens 15 -17 (focusing lens with the focal length f-1), with apertures 12-14, which generates a focal point B in the focus of the collimating lens (focal length f 2 ).
  • the collimation is realized in the second step by the common collimating lens 18.
  • the collimating lens 18 In front of the collimating lens 18 there is a clear inclination of the beams 1 .1, 2.1, 3.1 coming from the fibers 1, 2, 3 with respect to the optical axis 19 (dash-dot line).
  • the inclination between the light beams is significantly lower in the area between the collimating lens 18 and the polygonal facet 20 than between the optical fibers 1, 2, 3 (typical factor about 8).
  • the crossing point Ki of the lenses 15-17 is imaged by the collimating lens 18 on the polygon facet mirror 20. All light beams 1 .2, 2.2, 3.2 are therefore on the polygon facet mirror 20 one above the other, ie here is a second real crossing point (pupil).
  • the decoupling electronics 21 consists of collecting and at least one diverging lens.
  • Each fiber 1, 2, 3 here also has its own converging lens (focusing lens) 15-17, which generates a virtual focal point B v in the focal plane of the collimating lens 22.
  • the collimation is realized in the second step by the common diverging lens 22.
  • the virtual crossing point K v is imaged by the collimating lens 22 on the polygon facet mirror 20, therefore, there exists a real crossing point (pupil). All light rays pass the polygon facet mirror 20 through a dot.
  • the fibers 1 -3 in the coupling-out 1 1, 21 are involved.
  • the number of fibers is typically in the range between 1 and 10. However, an absolute upper limit is not given. It is conceivable a variety of different implementations of the fiber group.
  • the fibers can also be arranged in several levels, see Fig. 3a-c. Shown are various arrangements of fiber groups in the direction of the optical axis 19 and in each case the fiber end faces of several mutually inclined fibers.
  • the optical axis 19 is located at the intersection of the two lines Ln and L 12th In the projected image of the fiber group according to FIG. 4, the image in FIG. 3c is formed in an analogous manner. (Only by the movement of the rotating polygon arise the equidistantly written lines Z 11-19 .)
  • Variant B distance between the virtual crossing point and the collimation lens (L 2 > 0)
  • Variant B distance of the focusing lenses to the second focal plane of the
  • f 2 focal length of the collimating lens (variant A: f 2 > 0, variant B: f 2 ⁇ 0)
  • Di beam diameter at the focusing lens
  • inventive couplings 10, 20 have the same beam diameter as in the prior art when using the same optical fiber on the projection screen 30 and on the facets of the polygon mirror 20.
  • Another requirement is a positive distance between focusing and collimating lenses:
  • the focal length of the collimating lens should also match the beam diameters of the two beams and their distances.
  • the usable diameter of a lens is about half the amount of its focal length, so it applies:
  • a reduction in size is further achieved by a combination of the two variants (A and B) with a telescope 30.
  • the telescope 30 is introduced between the fiber outcoupling and the Polygonfacettenapt 20 in the optical path.
  • the optical scheme is shown in Fig. 6 and Fig. 7 for the variant B.
  • variant A the arrangement is mutatis mutandis.
  • a diaphragm 31 can be positioned at the output-side crossing point of the fiber extraction.
  • the distance of the diverging lens 21 to the aperture 31 is Li.
  • the polygon facet mirror 20 is at the focal point of the second telescope lens (output pupil of the telescope 30).
  • the telescope 30 reduces the angle of inclination of the light beams after fiber extraction by a factor of approximately 8.
  • the light beam is widened by the same factor.
  • the overall length can be shortened considerably.
  • Using a segmented mirror 40 another constructive alternative with respect to the space problem in the area of the focusing lenses 41-49 is given.
  • the number of fibers 1, 3, 9 shown in FIG. 8 and their arrangement is only an example here. Due to the segmented mirror 40, a good spatial separation of the three focusing optics 42, 48, 49 shown is possible.
  • FIG. 9 an axial view of a coupling-out with the segmented mirror 40 with the incorporated 9 fibers.
  • the ninth fiber lies exactly in the axial direction.
  • the different hatchings in the segmented mirror 40 show the inclination of the individual mirror segments whose size is a few millimeters.
  • a side view of the coupling-out group 51 from FIG. 9 is shown in FIG. 10.
  • Fig. 1 1 shows that ample space for necessary Justage Anlagenn 50 can be created by this design proposal.
  • Possible adjustment aids 50 are, for example, rotatable plane parallel plates or optical wedges. Thus, then the fine adjustment of the beam position and / or beam tilt can be made.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

La présente invention concerne une tête de projection pour un projecteur laser à extraction à partir de fibres, lesdites fibres présentant un écart relativement grand entre elles, et ladite tête de projection reposant donc sur un nouveau concept qui améliore les propriétés optiques de la tête de projection lors de la projection laser à balayage. Elle concerne une extraction à partir de fibres qui présente des avantages par rapport aux solutions actuelles avec deux fibres. Ce concept offre la possibilité de pouvoir régler la position du point d'intersection (K1 ) des faisceaux lumineux (1.1, 2.1, 3.1). Il est ainsi possible de situer le point d'intersection sur les facettes d'un miroir polygonal (20). Les pertes de lumière qui subsistent ne sont plus que minimes et les altérations marginales de la couleur lors de la projection sur une surface de projection (30) sont réduites. L'écart latéral entre les fibres (1, 2, 3) est relativement grand et est de l'ordre de quelques millimètres. Cet écart important permet d'intégrer des éléments d'ajustement supplémentaires, ainsi que d'utiliser des fiches pour fibres individuelles classiques.
EP13705980.4A 2012-02-21 2013-02-19 Tête de projection pour un projecteur laser Withdrawn EP2817967A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012202637A DE102012202637A1 (de) 2012-02-21 2012-02-21 Projektionskopf für einen Laserprojektor
PCT/EP2013/053242 WO2013124257A1 (fr) 2012-02-21 2013-02-19 Tête de projection pour un projecteur laser

Publications (1)

Publication Number Publication Date
EP2817967A1 true EP2817967A1 (fr) 2014-12-31

Family

ID=47749815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13705980.4A Withdrawn EP2817967A1 (fr) 2012-02-21 2013-02-19 Tête de projection pour un projecteur laser

Country Status (4)

Country Link
US (1) US20150042967A1 (fr)
EP (1) EP2817967A1 (fr)
DE (1) DE102012202637A1 (fr)
WO (1) WO2013124257A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014107860A1 (de) * 2014-06-04 2015-12-17 Ldt Laser Display Technology Gmbh Vorrichtung zum Projizieren eines Bildes auf eine Projektionsfläche
JP7088937B2 (ja) 2016-12-30 2022-06-21 イノビュージョン インコーポレイテッド 多波長ライダー設計
WO2019164961A1 (fr) * 2018-02-21 2019-08-29 Innovusion Ireland Limited Systèmes lidar à couplage de fibres optiques
US20190265339A1 (en) 2018-02-23 2019-08-29 Innovusion Ireland Limited Distributed lidar systems
CN114063379A (zh) * 2021-11-22 2022-02-18 四川长虹电器股份有限公司 一种光源装置及投影系统

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US4185891A (en) * 1977-11-30 1980-01-29 Grumman Aerospace Corporation Laser diode collimation optics

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US5136675A (en) * 1990-12-20 1992-08-04 General Electric Company Slewable projection system with fiber-optic elements
DE19726860C1 (de) * 1997-06-24 1999-01-28 Ldt Gmbh & Co Verfahren und Vorrichtung zur Darstellung eines Videobildes sowie ein Herstellungsverfahren für die Vorrichtung
US7102700B1 (en) * 2000-09-02 2006-09-05 Magic Lantern Llc Laser projection system
CA2645135C (fr) * 2001-10-01 2011-08-30 Matsushita Electric Industrial Co., Ltd. Appareil d'affichage de type projection, projecteur arriere et systeme multivision
US6816292B2 (en) * 2002-12-26 2004-11-09 Pentax Corporation Scanning optical system
DE102004001389B4 (de) 2004-01-09 2006-01-26 Jenoptik Ldt Gmbh Anordnung und Vorrichtung zur Minimierung von Randverfärbungen bei Videoprojektionen
US8089425B2 (en) * 2006-03-03 2012-01-03 Prysm, Inc. Optical designs for scanning beam display systems using fluorescent screens
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DE102007019017A1 (de) 2007-04-19 2009-01-22 Ldt Laser Display Technology Gmbh Verfahren und Vorrichtung zum Projizieren eines Bildes auf eine Projektionsfläche
US7667727B2 (en) * 2007-12-20 2010-02-23 Palo Alto Research Center Incorporated Multiple-beam raster output scanner with a compensating filter
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Publication number Priority date Publication date Assignee Title
US4185891A (en) * 1977-11-30 1980-01-29 Grumman Aerospace Corporation Laser diode collimation optics

Also Published As

Publication number Publication date
WO2013124257A1 (fr) 2013-08-29
DE102012202637A1 (de) 2013-08-22
US20150042967A1 (en) 2015-02-12

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