WO2015050473A1 - Système optique pour combiner des faisceaux - Google Patents

Système optique pour combiner des faisceaux Download PDF

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Publication number
WO2015050473A1
WO2015050473A1 PCT/RU2013/000875 RU2013000875W WO2015050473A1 WO 2015050473 A1 WO2015050473 A1 WO 2015050473A1 RU 2013000875 W RU2013000875 W RU 2013000875W WO 2015050473 A1 WO2015050473 A1 WO 2015050473A1
Authority
WO
WIPO (PCT)
Prior art keywords
prisms
sides
optical system
inputting
combiner
Prior art date
Application number
PCT/RU2013/000875
Other languages
English (en)
Inventor
Maksim Nikolaevich KHROMOV
Vladislav Gennadievich NIKITIN
Nikolay Ivanovich PETROV
Yury Mihaylovich SOKOLOV
Angela Liudvigovna STOROZHEVA
Original Assignee
Huawei Technologies Co., Ltd
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 Huawei Technologies Co., Ltd filed Critical Huawei Technologies Co., Ltd
Priority to PCT/RU2013/000875 priority Critical patent/WO2015050473A1/fr
Publication of WO2015050473A1 publication Critical patent/WO2015050473A1/fr

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Classifications

    • 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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources
    • 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
    • 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
    • G02B27/12—Beam splitting or combining systems operating by refraction only
    • G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection

Definitions

  • the present invention relates to an optical system for combining at least a first and a second beam onto a spatial light modulator, beam combiner for combining at least a first and a second beam, and a method for combining at least a first and a second beam onto a spatial light modulator.
  • the invention relates to a pico projection system, especially for the increasing of brightness of projectors.
  • a projector uses a spatial light modulator, color filters, and a color wheel with a lamp and a beam combiner with three light sources of different wavelengths.
  • solid-state light sources and other narrow-wavelength-band and/or polarized light sources capable of producing visible light have drawn significant attention as alternative light sources for use in imaging systems, such as projection systems. These light sources exhibit a compact size, greater durability, longer operating life, and lower power consumption. Often white lamps are used as a light source within these projectors.
  • Beam combiners often use a plurality of optical components which have to be adjusted relative to each other.
  • beam combiners such as beam combiners using dichroic mirrors or different combs with prismatic arrays which use total internal reflection or refraction, diffraction gratings and others.
  • Document US 5,504,544 describes a linear prismatic film for beam combining.
  • Document US 5,231,433 describes a refractive comb for beam combining.
  • the invention is based on the finding that multiple light sources with different wavelengths and a beam combiner are an effective and simple solution for an optical projector, e.g. a pico projector.
  • the light sources can be light emitting diodes or lasers. These light sources can be used for a switching of different colours.
  • a beam combiner combines beams of different colours and redirects light into the same area and direction.
  • beam combiners that are used in projection systems, such as dichroic mirrors or X-prisms. Often beam combiners inefficient and their manufacturing is difficult and expensive, since several special optical coatings are used. In general light transmission should be increased and size and construction of the beam combiner should be reduced.
  • the invention relates to an optical system for combining at least a first and a second beam onto a spatial light modulator comprising a first light source for outputting a first beam of a first wavelength; a second light source for outputting a second beam of a second wavelength; and a beam combiner having a plurality of first triangular prisms having first and second sides, the first sides of the first prisms facing the first light source for inputting the first beam and for internally reflecting the second beam, the second sides of the first prisms facing the second light source for inputting the second beam and for internally reflecting the first beam; and a plurality of second triangular prisms with first and second sides, the first sides of the second prisms for outputting and refracting the first and second beam parallel onto the spatial light modulator or a screen.
  • the optical system comprises a third light source for outputting a third beam of a third wavelength.
  • the beam combiner comprises a flat side face for inputting the third beam.
  • the third light source is arranged for perpendicularly inputting the third beam into the flat side face.
  • the second sides of the second prisms are arranged for refracting the third beam parallel to the first and second beam refracted by the first sides of the second prisms.
  • the first sides of the first prisms and the second sides of the first prisms are arranged in an acute angle with respect to each other.
  • the first light source is arranged for perpendicularly inputting the first beam into the first sides of the first prisms.
  • the second light source is arranged for perpendicularly inputting the second beam into the second sides of the first prisms.
  • the optical system comprises a homogenizer for creating a beam with uniform shape from the first, the second and the third beam output by the beam combiner.
  • the invention relates to a beam combiner for combining at least a first and a second beam comprising a plurality of first triangular prisms having first and second sides, for inputting the first beam and internally reflecting the second beam, the second sides of the first prisms for inputting the second beam and internally reflecting the first beam; and a plurality of second triangular prisms with first and second sides, the first sides of the second prisms for outputting and refracting the first and second beam onto a spatial light modulator or a screen.
  • the beam combiner comprises a flat side face for inputting a third beam of a third wavelength.
  • the second sides of the second prisms are arranged perpendicularly to an output side of the beam combiner.
  • the invention relates to a method for combining at least a first and a second beam onto a spatial light modulator, comprising the steps of outputting a first beam of a first wavelength; outputting a second beam of a second wavelength; inputting the first beam in first sides of first prisms of a beam combiner and internally reflecting the second beam by the first sides of the first prisms; inputting the second beam in second sides of the first prisms of the beam combiner and internally reflecting the first beam by the second sides of the first prisms; and refracting the first and second beams by first sides of second prisms of the beam combiner for outputting parallel on a spatial light modulator or a screen.
  • the method comprises the step of inputting a third beam into a flat side the beam combiner.
  • the method comprises the step of refracting the third beam by second sides of second prisms of the beam combiner for outputting the third beam parallel to the first and second beam.
  • Fig. 1 shows a schematic diagram of a beam combiner having first and second prisms according to an implementation form
  • Fig. 2 shows a schematic diagram of the beam combiner having first and second prisms according to an implementation form
  • Fig. 3 A shows a schematic diagram of the beam combiner having first and second prisms according to an implementation form
  • Fig. 3B shows a schematic diagram of the beam combiner having first and second prisms and according to an implementation form
  • Fig. 4 shows a light distribution of the beam combiner
  • Fig. 5 shows an optical system for combining three beams and forming uniform shape of beams
  • Fig. 6 shows an intensity profile of the beam combiner.
  • Fig. 1 shows a schematic diagram of a beam combiner 105 having a plurality of first and second prisms 107 and 109 according to an implementation form.
  • the beam combiner 105 is for combining a first and a second beam 103-1, 103-2.
  • the first triangular prisms 107 have first and second sides 107-1 and 107-2.
  • the first sides 107-1 of the first prisms 107 serve for inputting the first beam 103-1 into the beam combiner 105 and internally reflecting the second beam 103-2.
  • the second sides 107-2 of the first prisms 107 serve for inputting the second beam 103-2 and internally reflecting the first beam 103-1.
  • the first sides 107-1 and the second sides 107-2 are equal in lengths.
  • the first prisms 107 have a cross section in the form of an equilateral or an isosceles triangle.
  • the first sides 107-1 of the first prisms 107 and the second sides 107-2 of the first prisms 107 are arranged in an acute angle with respect to each other.
  • the beam combiner 105 comprises a plurality of second triangular prisms 109 with first and second sides 109-1 an 109-2.
  • the first sides 109-1 of the second prisms 109 serve for outputting and refracting the first and second beam 103-1, 103-2 onto a spatial light modulator or a screen 200.
  • the second sides 109-2 of the second prisms 109 are arranged perpendicularly with respect to an output side 117 of the beam combiner 105.
  • the second sides 109-2 of the second prisms 109 serve for refracting a third beam 103-3 parallel to the first and second beam 103-1 and 103-2 that are refracted by the first sides 109- 1 of the second prisms 109.
  • the second prisms 109 have a cross section in the form of a right triangle.
  • the first and second prisms 107 and 109 are integrally formed on parallel faces of block of transparent material. Therefore, there is no need for manually need adjusting the first and second prisms 107 and 109 relatively to each other.
  • Fig. 2 shows a schematic diagram of the beam combiner 105 having first and second prisms 107 and 109 according to an implementation form.
  • the first and second prisms 107 and 109 are parallel linear, triangular prisms.
  • the block of the beam combiner 105 comprises a flat side face 11 1 for inputting a third beam 103-3 of a third wavelength.
  • the flat side face 11 1 is integrally formed in a lateral side of the beam combiner block between an input face 119 for inputting the beams and an output face 117 for outputting the beams.
  • the part of the beam combiner 105 having the flat side face 111 protrudes from the combiner block in triangular fashion.
  • the input face 119 of the beam combiner 105 and the output face 117 of the beam combiner 105 are parallel to each other.
  • the first input face 119 with first prisms 107 uses total internal reflection (TIR) for beam combining.
  • TIR total internal reflection
  • the two light beams 103-1 and 103-2 are combined in the first comb having the first prisms 107 using total internal reflection. A light beam with two mixed colors is obtained. This beam and the third beam 103-3 are combined at the second comb having the second prisms 109. In this case refraction is used.
  • the first comb and the second comb are an integral part of a transparent block which forms the beam combiner 105. This block has a special entrance surface for the third light beam 103-3, which is used for increasing transmission.
  • the beam combiner redirects three light beams 103-1, 103-2 and 103-3 parallel in the same direction.
  • the beam combiner 105 allows redirecting three light beams with different colors in the same direction.
  • the beam combiner 105 consists of one single transparent block without optical coatings.
  • Fig. 3 A shows a schematic diagram of the beam combiner 105 having first and second prisms 107 and 109 according to an implementation form.
  • the incidence angle a to the second prisms 109 i.e. comb or prismatic array, should be
  • n is the refraction index of the combiner material, as the third beam 103-3 should be in the same direction as the first and the second light beams 103-1 and 103-2.
  • the input surface between AB of the flat side face 111 should be perpendicular to the third light beam 103-3. Consequently, an angle between points BAM should be equal ⁇ 5° so that losses for the third light beam 103-3 are reduced.
  • Fig. 3B shows a schematic diagram of the beam combiner 105 having first and second prisms 107 and 109 according to an implementation form.
  • light sources are used which produce narrow beams.
  • Fig. 4 shows a light distribution of the beam combiner 105 when it is illuminated with the three beams 103-1, 103-2, and 103-3.
  • Fig. 4 shows results of a simulation of the beam combiner 105.
  • SLM spatial light modulator
  • Fig. 5 shows an optical system 100 for combining a first, a second beam, and a third beam 103-1, 103-2 and 103-3 on a screen or a spatial light modulator 200.
  • the optical system 100 comprises a first light source 101-1 for outputting a first beam 103- 1 of a first wavelength, a second light source 101-2 for outputting a second beam 103-2 of a second wavelength, and a third light source 101-3 for outputting a third beam 103- 3 of a third wavelength.
  • the light sources 101-1, 101-2 or 101-3 are light emitting diodes or lasers.
  • the light beams 103-1, 103-2 and 103-3 created by the light sources 101-1, 101-2 or 101-3 have a different wavelength each.
  • the first sides 107-1 of the first prisms 107 face the first light source 101-1 for inputting the first beam 103-1 and for internally reflecting the second beam 103-2.
  • the second sides 107-2 of the first prisms 107 face the second light source 101-2 for inputting the second beam 103-2 and for internally reflecting the first beam 103-1.
  • the first and second beam 103-1 and 103-2 are incident at the first side 109-1 of the second prisms 109.
  • the third beam 103-3 is incident on the second side 109-2 of the second prisms 109.
  • the first sides 109-1 of the second prisms 109 serve for outputting and refracting the first and second beams 103-1, 103-2 parallel onto the spatial light modulator 200.
  • the second sides 109-2 of the second prisms 109 are arranged for refracting and outputting the third beam 103-3 parallel to the first and second beam 103-1, 103-2 refracted by the first sides 109-1 of the second prisms 109.
  • the third beam 103-3 is input in the protruding flat side face 111.
  • the third light source 101-3 is arranged for perpendicularly inputting the third beam 103-3 into the flat side face 111.
  • the first light source 101-1 is located such that the first beam 103-1 is input into the first sides 107-1 of the first prisms 107 perpendicularly.
  • the second light source 101-2 is located such the second beam 103-2 is input into the second sides 107-2 of the first prisms 107 perpendicularly.
  • the beams 103-1, 103-2 and 103-3 are output on a common side of the beam combiner 105.
  • This side integrally forms the plurality of parallel linear, triangular second prisms 109.
  • the output side of the beam combiner 105 combine the directions of the beams 103-1, 103-2 and 103-3 with different colors.
  • the optical system comprises a homogenizer 121 for creating a beam 115 with uniform shape from the first, the second and the third beam 103-1, 103-2, 103-3 output by the beam combiner 105.
  • the homogenizer 121 can be a multispectral homogenizer.
  • the homogenizer 121 is not only used for creating a single beam with uniform shape but also for finally combining beams with different colors. .
  • the optical system 100 three beams 103-1, 103-2, 103-3 having different wavelength are combined in order to create a white uniform shape at the spatial light modulator 200 (LCoS, DLP). To that end a homogenizer 121 and a lens 123 are installed after the beam combiner 105.
  • the optical system 100 can be used in a projector for projecting images onto a screen. Using the optical system 100 images with different colors can be created in series.
  • the angle b after the beam combiner 105 can be calculated as:
  • the optical system 100 can be used in a projector, where it exhibits a good transmission and is implemented in a small way.
  • Fig. 6 shows intensity profile of the beam combiner 105.
  • Fig. 6 shows a modeling and corresponding simulation results. The difference between central and side parts is 24% in column profile and 15% in row profile. The image color is white.
  • the beam combiner has the advantage that the beam combiner does not need to have an optical coating. This simplifies the construction and manufacturing of the beam combiner. Merely total internal reflection and refraction are used for combining different beams. Since the beam combiner consists of one continuous transparent block, in which the prisms are integrally formed, it is not necessary to manually adjust or align optical elements with each other.

Abstract

L'invention concerne un système optique pour combiner au moins un premier et un second faisceau sur un modulateur spatial de lumière comprenant une première source de lumière (101-1) pour délivrer un premier faisceau (103-1) d'une première longueur d'onde; une seconde source de lumière (101-2) pour délivrer un second faisceau (103-2) d'une seconde longueur d'onde; et un combineur de faisceaux (105) comportant une pluralité de premiers prismes triangulaires (107) ayant des premiers et seconds côtés, les premiers côtés (107-1) des premiers prismes (107) étant en regard de la première source de lumière (101-1) pour faire entrer le premier faisceau (103-1) et pour réfléchir d'une manière interne le second faisceau (103-2), les seconds côtés (107-2) des premiers prismes (107) étant en regard de la seconde source de lumière (101-2) pour faire entrer le second faisceau (103) et pour réfléchir d'une manière interne le premier faisceau (103-1); et une pluralité de seconds prismes triangulaires (109) ayant des premiers et seconds côtés, les premiers côtés (109-1) des seconds prismes (109) étant destinés à faire sortir et réfracter les premier et second faisceaux (103-1, 103-2) parallèles sur le modulateur spatial de lumière.
PCT/RU2013/000875 2013-10-03 2013-10-03 Système optique pour combiner des faisceaux WO2015050473A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2013/000875 WO2015050473A1 (fr) 2013-10-03 2013-10-03 Système optique pour combiner des faisceaux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2013/000875 WO2015050473A1 (fr) 2013-10-03 2013-10-03 Système optique pour combiner des faisceaux

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WO2015050473A1 true WO2015050473A1 (fr) 2015-04-09

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084180A (en) 1975-10-09 1978-04-11 U.S. Philips Corporation Color splitting prism assembly
JPS63132215A (ja) * 1986-11-25 1988-06-04 Mitsubishi Rayon Co Ltd 複数光束を単一光束にする投写方式
US5098183A (en) 1988-09-12 1992-03-24 Seiko Epson Corporation Dichroic optical elements for use in a projection type display apparatus
US5231433A (en) 1990-01-19 1993-07-27 Asahi Kogaku Kogyo Kabushiki Kaisha Reflecting illumination projecting device
EP0607582A1 (fr) * 1992-12-21 1994-07-27 Minnesota Mining And Manufacturing Company Rétroprojecteur avec lentille Fresnel catadioptrique
US5453918A (en) * 1994-01-19 1995-09-26 Hernandex; Fernando P. C. Color illumination apparatus
US5504544A (en) 1994-11-23 1996-04-02 Minnesota Mining And Manufacturing Company Projector with multiple lamp light source
US6325514B1 (en) * 1998-04-30 2001-12-04 Fuji Photo Film Co., Ltd. Projection type display device
US6676260B2 (en) 2002-04-25 2004-01-13 Eastman Kodak Company Projection apparatus using spatial light modulator with relay lens and dichroic combiner

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084180A (en) 1975-10-09 1978-04-11 U.S. Philips Corporation Color splitting prism assembly
JPS63132215A (ja) * 1986-11-25 1988-06-04 Mitsubishi Rayon Co Ltd 複数光束を単一光束にする投写方式
US5098183A (en) 1988-09-12 1992-03-24 Seiko Epson Corporation Dichroic optical elements for use in a projection type display apparatus
US5231433A (en) 1990-01-19 1993-07-27 Asahi Kogaku Kogyo Kabushiki Kaisha Reflecting illumination projecting device
EP0607582A1 (fr) * 1992-12-21 1994-07-27 Minnesota Mining And Manufacturing Company Rétroprojecteur avec lentille Fresnel catadioptrique
US5453918A (en) * 1994-01-19 1995-09-26 Hernandex; Fernando P. C. Color illumination apparatus
US5504544A (en) 1994-11-23 1996-04-02 Minnesota Mining And Manufacturing Company Projector with multiple lamp light source
US6325514B1 (en) * 1998-04-30 2001-12-04 Fuji Photo Film Co., Ltd. Projection type display device
US6676260B2 (en) 2002-04-25 2004-01-13 Eastman Kodak Company Projection apparatus using spatial light modulator with relay lens and dichroic combiner

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