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WO1998037455A1 - Dispositif d'eclairage pour projecteur - Google Patents

Dispositif d'eclairage pour projecteur Download PDF

Info

Publication number
WO1998037455A1
WO1998037455A1 PCT/DE1997/001889 DE9701889W WO9837455A1 WO 1998037455 A1 WO1998037455 A1 WO 1998037455A1 DE 9701889 W DE9701889 W DE 9701889W WO 9837455 A1 WO9837455 A1 WO 9837455A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
lamps
lighting device
sections
reflector sections
Prior art date
Application number
PCT/DE1997/001889
Other languages
German (de)
English (en)
Inventor
Franc Godler
Original Assignee
Franc Godler
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 Franc Godler filed Critical Franc Godler
Priority to EP97938796A priority Critical patent/EP0961950A1/fr
Priority to JP53612898A priority patent/JP2001511913A/ja
Priority to CA002281517A priority patent/CA2281517A1/fr
Publication of WO1998037455A1 publication Critical patent/WO1998037455A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G03B21/208—Homogenising, shaping of the illumination light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors

Definitions

  • the invention relates to a lighting device for illuminating an extensive image-producing field in a projector with light source means and a reflector arranged behind the light source means.
  • the invention relates to video projectors in which the image-producing field is formed by a liquid crystal field (liquid crystal display or panel), the liquid crystals being controllable in accordance with video signals.
  • the imaging field can also be a slide field.
  • Metal halide lamps are commonly used as light sources in high power projectors. Such metal halide lamps have an undesirably short lifespan of approximately 250 to 1000 hours. They are very expensive, so that projectors equipped with them can practically only be used for commercial purposes. Lamps containing xenon are known which are used as lamps for motor vehicle headlights. Such lamps are manufactured in large numbers and are therefore relatively inexpensive. They also have a long lifespan of over 3000 hours. The disadvantage of these xenon-containing lamps is that their brightness is limited. The luminous flux of such lamps is a maximum of 5000 Im at 50 W electrical power.
  • projection of a liquid crystal field onto a screen using a video projector requires a lamp luminous flux of at least 15,000 Im if an appealing brightness of e.g. 200 to 300 ANSI lumens should be achieved on the screen.
  • the invention has for its object to provide an inexpensive lighting device for a projector with sufficient brightness of the projected image.
  • Light source means are formed by a plurality of lamps, preferably xenon-containing gas discharge headlight lamps.
  • the lamps can also be of another type, for example halogen lamps with a smaller luminous flux.
  • the reflector consists of a plurality of adjoining reflector sections, each of these reflector sections being optically aligned with one of the lamps in such a way that a largely uniformly illuminated area is obtained.
  • the reflector can have a rectangular basic shape and consist of four rectangular reflector sections, in front of which a lamp is arranged in each case.
  • Such a reflector makes it possible to arrange four (or more) lamps so that each lamp illuminates essentially a quarter of the imaging field. Due to a certain blurring, which results from the finite expansion of the lamps, the transitions are not visible.
  • the lamps are held on the rear side of the reflector and protrude through openings in the reflector.
  • the openings for the xenon lamps can be circular.
  • the circular openings can be formed with side cutouts for the power supply.
  • the lamps are adjustable in one or more directions relative to the reflector.
  • the reflector sections are paraboloidal. You can also have other aspheric surfaces. Since the xenon-containing headlight lamps have an uneven radial radiation characteristic, the lamps are expediently offset from the center of the reflector sections. The axes of the paraboloids are then advantageously also offset with respect to the centers of the reflector sections, so that they run through the offset lamps. The direction of the offset of the xenon lamps and the axes of the paraboloids depends the orientation of the lamps. The offset should be in the direction in which the radial radiation of the lamp is the least. The lamps can thus be offset both towards the center of the entire reflector and towards the outside. As a result, a uniform illumination of the image-producing field is achieved.
  • the reflector is made of glass with an infrared-reflecting mirroring.
  • infrared radiation heat radiation
  • This can significantly reduce the thermal load on the imaging field.
  • the uniform illumination of the imaging field can be further improved by designing the reflecting surfaces of the reflector or the reflector sections in such a way that the reflectivity has local differences. In this way, irregularities in the radiation characteristics of the lamps can be compensated.
  • the locally different reflectivity can be generated, for example, by completely or partially faceting the reflecting surfaces of the reflector or the reflector sections. Individual facets can then e.g. be matted. It has proven to be advantageous if the regions of the reflector which are close to the lamps are facetted and the outer region of the reflector remains smooth, these smooth surfaces being matted.
  • Illumination of the imaging field is to provide magnetic field generating means that are nearby of the lamps are arranged and through which the radiation of the lamps can be influenced.
  • the generated magnetic field acts on the ion and electron current of the lamp.
  • the radiation characteristics can be changed during operation of the lamps. In particular, influences of gravitation can be compensated for.
  • Fig. 1 is a schematic illustration and shows a
  • FIG. 2 is a schematic sectional illustration and shows a projector with an illumination device according to FIG. 1 in a side view.
  • FIG. 3 is a schematic perspective illustration and shows the projector of FIG. 2 in an oblique view from the front.
  • Fig. 4 is a schematic representation and shows a xenon-containing headlight lamp in side view.
  • 10 denotes a lamp unit of a lighting device.
  • the lamp unit 10 has a rectangular reflector 11.
  • the reflector 11 can be made of mirrored metal, but preferably made of glass with a lens that is transparent to infrared radiation. Reflection.
  • the reflector 11 is divided into four adjacent rectangular reflector sections 12, 14, 16 and 18.
  • Openings 32, 34, 36 and 38 for xenon-containing headlight lamps are provided in the apex of the respective paraboloid-shaped reflector sections 12, 14, 16 and 18. These openings 32, 34, 36 and 38 are circular with side cutouts 40, 42, 44 and 46 for the power supply of the xenon-containing headlight lamps.
  • the reflector 11 has the following dimensions (FIG. 1):
  • the openings 32, 34, 36 and 38 have a diameter of 12 mm.
  • FIGS. 2 and 3 show a projector in which the lamp unit 10 shown in FIG. 1 is used. Corresponding parts in FIGS. 2 and 3 are provided with the same reference symbols as in FIG. 1.
  • FIG. 1 In the openings 32, 34, 36 and 38 (FIG. 1) there is a xenon-containing headlight lamp 48, 50, 52 and 54, respectively.
  • the lamps 48, 50, 52 and 54 are located in the focal point of the respective reflector section 12 , 14, 16 and 18 are mounted on the back of the reflector 11 and are adjustable relative to the reflector sections 12, 14, 16 and 18 by means of adjusting screws, of which only two adjusting screws 56 and 58 are visible in FIG. 2.
  • An infrared filter 60 (FIG. 2), an image-producing field in the form of a Flussigk ⁇ stall field 62, a Fresnel lens 64 and an objective 66 are located in the beam path in front of the lamp unit 10.
  • An image is generated on the liquid crystal field 62 in a known and not shown manner, which image is imaged by the Fresnel lens 64 and the lens 66 on a screen (not shown).
  • a liquid stall field 62 of 130 x 98 mm in size is to be uniformly illuminated by the lamp unit 10.
  • the lamp unit 10 is somewhat larger than the area of the liquid crystal field 62 and is located at a distance of approximately 20 cm from the liquid crystal field 62.
  • the surfaces are faceted only in an area close to the lamps 48, 50, 52 and 54, so that about 2/3 of the respective surface is smooth. Depending on the radiation characteristics of lamps 48, 50, 52 and 54, some of the facets are matted.
  • the areas to be matted can be determined mathematically and / or experimentally.
  • the special design of the reflector sections 12, 14 16 and 18 and the eccentric arrangement of the lamps 48, 50, 52 and 54 in these reflector sections 12, 14 16 and 18 ensure uniform illumination of the liquid crystal field 62 reached. Furthermore, the adjustability of the lamps 48, 50, 52 and 54 allows fine adjustment.
  • the xenon-containing lamps are each provided with an iron core with a coil, which are attached to the rear of the reflector near the lamps.
  • the iron core has an air gap in which the lamp's combustion chamber is located. The air gap begins at the rear of the reflector and ends there. A further fine adjustment of the illumination can be achieved by applying a magnetic field.
  • the lamp shows a commercially available xenon-containing headlight lamp which can be used in the present invention.
  • the lamp consists of a base 68, a glass body 70 with an upper and a lower electrode, a lower power supply 72 and an upper power supply 74.
  • the upper power supply runs axially along the glass body 70 from the base 68 to that Base 68 facing away from the end of the glass body 70.
  • the uneven radial radiation characteristic of the lamp shown is caused by the Infeed 74 caused shading and caused by a salt filling in the combustion chamber.
  • the orientation of the lamps 48, 50, 52 and 54 is chosen such that the upper power supply 74 points towards the center of the entire reflector. In these directions and towards the earth's surface there are indentations in the radiation characteristic. This is compensated for by the offset of the lamps 48, 50, 52 and 54 towards the center of the entire reflector and by the application of a magnetic field. It is expressly noted that the present invention is not limited to such orientation of lamps 48, 50, 52 and 54. If the indentations of the radiation characteristic lamps 48, 50, 52 and 54 point in another direction, then the lamps 48, 50, 52 and 54 are offset accordingly in this direction.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un dispositif d'éclairage pour éclairer un champ (62) étendu produisant des images dans un projecteur, qui contient des éléments de sources lumineuses et un réflecteur (10) placé derrière lesdits éléments de sources lumineuses. Les éléments de sources lumineuses sont formés par une pluralité de lampes (48, 50, 52, 54), de préférence des lampes de projecteurs à décharge gazeuse contenant du xénon. Le réflecteur (10) comprend une pluralité de sections adjacentes (12, 14,,16, 18), chacune de ces sections (12, 14, 16, 18) étant alignée optiquement sur une des lampes (48, 50, 52, 54) de manière qu'il en résulte une surface éclairée très homogène.
PCT/DE1997/001889 1997-02-19 1997-08-28 Dispositif d'eclairage pour projecteur WO1998037455A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97938796A EP0961950A1 (fr) 1997-02-19 1997-08-28 Dispositif d'eclairage pour projecteur
JP53612898A JP2001511913A (ja) 1997-02-19 1997-08-28 プロジェクタ用照明装置
CA002281517A CA2281517A1 (fr) 1997-02-19 1997-08-28 Dispositif d'eclairage pour projecteur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29703797.8 1997-02-19
DE29703797U DE29703797U1 (de) 1997-02-19 1997-02-19 Beleuchtungs-Einrichtung für einen Projektor

Publications (1)

Publication Number Publication Date
WO1998037455A1 true WO1998037455A1 (fr) 1998-08-27

Family

ID=8036847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001889 WO1998037455A1 (fr) 1997-02-19 1997-08-28 Dispositif d'eclairage pour projecteur

Country Status (6)

Country Link
EP (1) EP0961950A1 (fr)
JP (1) JP2001511913A (fr)
CN (1) CN1251663A (fr)
CA (1) CA2281517A1 (fr)
DE (1) DE29703797U1 (fr)
WO (1) WO1998037455A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6810189B2 (en) 1999-09-30 2004-10-26 Hitachi, Ltd. Optical waveguide and method for preparing the same
EP1477846A1 (fr) * 2003-05-13 2004-11-17 Hewlett-Packard Development Company, L.P. Détection d'inclinaison dans une source de lumière
US7891826B2 (en) 2004-09-21 2011-02-22 Nikon Corporation Projector
US8147066B2 (en) 2004-09-21 2012-04-03 Nikon Corporation Portable information device having a projector and an imaging device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100465773C (zh) * 2004-12-03 2009-03-04 中强光电股份有限公司 投影仪
JP5111160B2 (ja) * 2008-02-28 2012-12-26 三菱電機株式会社 照明器具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777135A (en) * 1972-07-11 1973-12-04 Xerox Corp Illumination system
US4086010A (en) * 1976-11-01 1978-04-25 Xerox Corporation Illumination system utilizing two opposing DC lamps with an optimum barrel-shaped slit
EP0281056A1 (fr) * 1987-02-28 1988-09-07 Ricoh Company, Ltd Dispositif d'illumination pour un appareil à copier en couleur
DE4214262A1 (de) * 1992-05-03 1993-11-04 Wolf Henning Verfahren, anordnung und vorrichtung zum homogenen ausleuchten von dias in projektoren

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
DE421639C (de) * 1923-08-15 1925-11-14 Siemens Schuckertwerke G M B H Projektionslampe mit Reflektor
DE1103757B (de) * 1958-03-18 1961-03-30 Continental Elektro Ind Ag Beleuchtungseinrichtung fuer Bildwerfer, insbesondere fuer Kinobildwerfer
DE1203116B (de) * 1962-06-28 1965-10-14 Gevaert Photo Prod Nv Lampenhaus fuer ein photographisches Vergroesserungs- oder Kopiergeraet
FR1394183A (fr) * 1964-02-18 1965-04-02 Anciens Ets Barbier Dispositifs condenseurs de rayonnement perfectionnés
DE6913928U (de) * 1969-04-05 1969-10-09 Agfa-Gevaert Ag Projektor, insbesondere overheadprojektor
US3770344A (en) * 1969-05-20 1973-11-06 Ricoh Kk Light source system for overhead projectors
DE2245367A1 (de) * 1972-09-15 1974-03-21 Optical Radiation Corp Beleuchtungseinrichtung
CH582365A5 (fr) * 1975-03-24 1976-11-30 Alos Ag
US4223986A (en) * 1978-03-06 1980-09-23 Automation Gages, Inc. Surface illuminator
NL8002116A (nl) * 1980-04-11 1981-11-02 Philips Nv Reflektor voor filmprojektiedoeleinden.
DE8705671U1 (de) * 1987-02-16 1987-08-06 Demolux Gmbh & Co Kg, 6070 Langen Overhead-Projektor
EP0675476B1 (fr) * 1994-03-30 1998-06-03 Denso Corporation Dispositif d'affichage à cristaux liquides
US5504544A (en) * 1994-11-23 1996-04-02 Minnesota Mining And Manufacturing Company Projector with multiple lamp light source

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777135A (en) * 1972-07-11 1973-12-04 Xerox Corp Illumination system
US4086010A (en) * 1976-11-01 1978-04-25 Xerox Corporation Illumination system utilizing two opposing DC lamps with an optimum barrel-shaped slit
EP0281056A1 (fr) * 1987-02-28 1988-09-07 Ricoh Company, Ltd Dispositif d'illumination pour un appareil à copier en couleur
DE4214262A1 (de) * 1992-05-03 1993-11-04 Wolf Henning Verfahren, anordnung und vorrichtung zum homogenen ausleuchten von dias in projektoren

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6810189B2 (en) 1999-09-30 2004-10-26 Hitachi, Ltd. Optical waveguide and method for preparing the same
EP1477846A1 (fr) * 2003-05-13 2004-11-17 Hewlett-Packard Development Company, L.P. Détection d'inclinaison dans une source de lumière
US7891826B2 (en) 2004-09-21 2011-02-22 Nikon Corporation Projector
US8147066B2 (en) 2004-09-21 2012-04-03 Nikon Corporation Portable information device having a projector and an imaging device

Also Published As

Publication number Publication date
CN1251663A (zh) 2000-04-26
CA2281517A1 (fr) 1998-08-27
JP2001511913A (ja) 2001-08-14
DE29703797U1 (de) 1997-05-15
EP0961950A1 (fr) 1999-12-08

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