WO2021182096A1 - 発光装置、照明システム及び光通信システム - Google Patents

発光装置、照明システム及び光通信システム Download PDF

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Publication number
WO2021182096A1
WO2021182096A1 PCT/JP2021/006693 JP2021006693W WO2021182096A1 WO 2021182096 A1 WO2021182096 A1 WO 2021182096A1 JP 2021006693 W JP2021006693 W JP 2021006693W WO 2021182096 A1 WO2021182096 A1 WO 2021182096A1
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WO
WIPO (PCT)
Prior art keywords
light
emitting device
light emitting
control layer
translucent member
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.)
Ceased
Application number
PCT/JP2021/006693
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English (en)
French (fr)
Japanese (ja)
Inventor
亮祐 鴫谷
和幸 山江
秋山　博紀
英樹 和田
琴音 森
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management 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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to US17/802,567 priority Critical patent/US12018834B2/en
Priority to JP2022505896A priority patent/JP7417879B2/ja
Priority to EP21767617.0A priority patent/EP4119842A4/en
Priority to CN202180017180.2A priority patent/CN115210498B/zh
Publication of WO2021182096A1 publication Critical patent/WO2021182096A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/05—Optical design plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2121/00—Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/203—Filters having holographic or diffractive elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/26—Reflecting filters

Definitions

  • the present invention relates to a light emitting device, a lighting system, and an optical communication system.
  • a lighting device that irradiates illumination light is known.
  • the light emitted from the light source is taken out as illumination light by using an optical member such as a light guide plate, a lens or a filter, depending on the application or purpose.
  • Patent Document 1 for the purpose of obtaining high decorativeness, white light emitted from a white light source is partially transmitted through a blue filter so that both white light and blue light are incident on the light guide portion.
  • an illuminating device that irradiates illumination light in which the hue of light changes in a gradation from blue to orange by changing the ratio of white light to blue light according to the incident position of the light guide unit. ..
  • An object of the present invention is to provide a light emitting device or the like capable of extracting light by a new extraction method by devising the positional relationship between a plurality of optical members and a light source.
  • One aspect of the light emitting device is a light guide body having a translucent member having translucency at least in a visible light region and an optical control layer provided on at least a part of the surface of the translucent member. And a light source that emits light toward at least one end face of the translucent member, the optical control layer has a reflected wavelength selectivity in which the wavelength of the reflected light depends on the incident angle of the incident light. ..
  • One aspect of the lighting system according to the present invention includes the above light emitting device as a lighting device.
  • One aspect of the optical communication system according to the present invention includes the above light emitting device as an optical transmission device.
  • Light can be taken out with a new way of taking out.
  • FIG. 1 is a perspective view of the light emitting device according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the light emitting device according to the first embodiment.
  • FIG. 3A is a diagram showing a reflection spectrum of the colloidal crystal film G whose plan view is green.
  • FIG. 3B is a diagram showing a reflection spectrum of the colloidal crystal film R whose plan view is red.
  • FIG. 4 is a diagram for explaining the optical action of the light emitting device of Comparative Example 1.
  • FIG. 5 is a diagram for explaining the optical action of the light emitting device of Comparative Example 2.
  • FIG. 6 is a diagram for explaining the optical action of the light emitting device according to the embodiment.
  • FIG. 3A is a diagram showing a reflection spectrum of the colloidal crystal film G whose plan view is green.
  • FIG. 3B is a diagram showing a reflection spectrum of the colloidal crystal film R whose plan view is red.
  • FIG. 4 is a diagram for explaining the optical action of the light emit
  • FIG. 7 is a cross-sectional view schematically showing the appearance of light emitted from the light emitting device according to the embodiment when the colloidal crystal film R is used as the light control layer.
  • FIG. 8 is a perspective view schematically showing how the light emitted from the light emitting device according to the embodiment when the colloidal crystal film R is used as the light control layer is seen.
  • FIG. 9 is a cross-sectional view schematically showing the appearance of light emitted from the light emitting device according to the embodiment when the colloidal crystal film G is used as the light control layer.
  • FIG. 10 is a diagram for explaining an outline of an experiment when measuring an emission spectrum of a light emitting device.
  • FIG. 10 is a diagram for explaining an outline of an experiment when measuring an emission spectrum of a light emitting device.
  • FIG. 11 is a diagram showing an emission spectrum of a light source used in an experiment when measuring an emission spectrum of a light emitting device.
  • FIG. 12 is a diagram showing an emission spectrum in the light emitting device of Comparative Example 1.
  • FIG. 13 is a diagram showing the chromaticity of the emission spectrum in the light emitting device of Comparative Example 1.
  • FIG. 14 is a diagram showing an emission spectrum in the light emitting device of the first embodiment.
  • FIG. 15 is a diagram showing the chromaticity of the emission spectrum in the light emitting device of Example 1.
  • FIG. 16 is a diagram showing an emission spectrum in the light emitting device of the second embodiment.
  • FIG. 17 is a diagram showing the chromaticity of the emission spectrum in the light emitting device of the second embodiment.
  • FIG. 18 is a diagram showing the angle dependence of the light emission intensity of the light extracted from the light control layer for the light emitting devices of Examples 1 and 2.
  • FIG. 19 is a perspective view of a light emitting device according to a modified example of the first embodiment.
  • FIG. 20 is a cross-sectional view of the light emitting device according to the second embodiment.
  • FIG. 21 is a perspective view of the light emitting device according to the modified example of the second embodiment when viewed from the back side.
  • FIG. 22 is a cross-sectional view of the light emitting device according to the first modification.
  • FIG. 23 is a perspective view of the light emitting device according to the second modification.
  • FIG. 24 is a cross-sectional view of the light emitting device according to the second modification.
  • FIG. 25 is a perspective view of the light emitting device according to the third modification.
  • FIG. 26 is a cross-sectional view of the light emitting device according to the modified example 4.
  • FIG. 27 is a perspective view of the light emitting device according to the modified example 5.
  • FIG. 28 is a cross-sectional view of the light emitting device according to the modified example 6.
  • FIG. 29 is a cross-sectional view of the light emitting device according to the modified example 7.
  • FIG. 30 is a cross-sectional view of the light emitting device according to the modified example 8.
  • FIG. 31 is a cross-sectional view of the light emitting device according to the modified example 9.
  • FIG. 32 is a cross-sectional view of the light emitting device according to the modified example 10.
  • FIG. 33 is a cross-sectional view of the light emitting device according to the modified example 11.
  • FIG. 34 is a cross-sectional view of the light emitting device according to the modified example 12.
  • FIG. 35 is a cross-sectional view of the light emitting device according to the modified example 13.
  • each figure is a schematic diagram and is not necessarily exactly illustrated. Further, in each figure, substantially the same configuration may be designated by the same reference numerals, and duplicate description may be omitted or simplified.
  • FIG. 1 is a perspective view of the light emitting device 1 according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the light emitting device 1.
  • the light emitting device 1 includes a light guide body 10 that guides light, a light source 20 that emits light, and a housing 30 that houses the light source 20.
  • the light guide body 10 is an optical member that guides the light emitted from the light source 20 and emits it to the outside of the light guide body 10.
  • the light guide body 10 imparts an optical action to the light from the light source 20 incident on the light guide body 10 and the light transmissive member 11 on which the light emitted from the light source 20 is incident. It has an optical control layer 12 that emits light to the outside of the optical body 10.
  • the translucent member 11 is an optical member having translucency at least in the visible light region. That is, the translucent member 11 has a light property of transmitting visible light.
  • the transmittance of the translucent member 11 is preferably high, and is preferably at least 50% or more.
  • the translucent member 11 is preferably transparent to visible light.
  • the transparent translucent member 11 has a high transmittance so that the other side can be seen through.
  • the transmittance of the transparent translucent member 11 with respect to visible light is 70% or more, preferably 80% or more, and more preferably 90% or more.
  • the translucent member 11 may have translucency not only in the visible light region but also in the near infrared region. That is, the translucent member 11 may have translucency in the visible light region and the near infrared region.
  • the translucent member 11 has a first end face 11a and a second end face 11d located on the opposite side of the first end face 11a.
  • the translucent member 11 is a flat plate-shaped substrate, and further has a first main surface 11b and a second main surface 11c facing back to the first main surface 11b.
  • the first main surface 11b and the second main surface 11c are surfaces that can be seen when the translucent member 11 which is a substrate is viewed in a plan view.
  • the first end face 11a and the second end face 11d are the side surfaces of the substrate.
  • the translucent member 11 is a substrate having a rectangular shape in a plan view.
  • first end surface 11a and the second end surface 11d are parallel, and the first main surface 11b and the second main surface 11c are parallel. Further, the first end surface 11a and the second end surface 11d and the first main surface 11b and the second main surface 11c are perpendicular to each other.
  • the thickness of the translucent member 11 is, for example, about several mm to several cm, but is not limited to this.
  • the translucent member 11 is made of a translucent material.
  • the translucent member 11 is a transparent substrate that is transparent to visible light, such as a transparent resin substrate made of a transparent resin material or a glass substrate made of a transparent glass material.
  • a transparent resin substrate an acrylic substrate made of an acrylic resin or a polycarbonate substrate made of a polycarbonate resin can be used.
  • the transparent resin substrate may be a rigid substrate having no flexibility or a flexible substrate having flexibility. In the present embodiment, a rigid and transparent acrylic substrate is used as the translucent member 11.
  • the translucent member 11 functions as a light guide plate. That is, the light incident on the translucent member 11 guides the inside of the translucent member 11 and travels, and is emitted from the translucent member 11 to the outside. Therefore, the translucent member 11 has a light incident surface on which light is incident and a light emitting surface on which light incident from the light incident surface is emitted to the outside.
  • the first end surface 11a of the translucent member 11 is a light incident surface on which the light emitted from the light source 20 is incident, and the surfaces other than the first end surface 11a of the translucent member 11 are transparent.
  • the light that guides the inside of the light-transmitting member 11 serves as a light emitting surface that is emitted from the light-transmitting member 11.
  • the first main surface 11b, the second main surface 11c, and the second end surface 11d serve as light emitting surfaces.
  • the first main surface 11b, the second main surface 11c, and the second end surface 11d may be light incident surfaces, or the first main surface 11b, the second main surface 11b, and the second end surface 11d may be light incident surfaces.
  • a surface other than the main surface 11c and the second end surface 11d may be a light emitting surface.
  • the optical control layer 12 is an optical member that imparts an optical action to the light incident on the optical control layer 12.
  • the light control layer 12 is provided on at least a part of the surface of the translucent member 11. Therefore, the optical control layer 12 imparts an optical action to the light incident on the optical control layer 12 from the translucent member 11. The optical action of the optical control layer 12 will be described later.
  • the optical control layer 12 is provided on the first main surface 11b of the translucent member 11. Specifically, the optical control layer 12 is formed on the entire surface of the first main surface 11b so as to be in contact with the first main surface 11b of the translucent member 11.
  • the thickness of the optical control layer 12 is uniform throughout the optical control layer 12. That is, the thickness of the optical control layer 12 is constant.
  • the thickness of the optical control layer 12 is preferably 5 ⁇ m or more and 100 ⁇ m or less, but is not limited to this.
  • the light control layer 12 has a reflection wavelength selectivity in which the wavelength of the reflected light depends on the incident angle of the incident light. That is, the optical control layer 12 has a reflection wavelength selectivity in which the wavelength of the reflected light when the incident light incident on the optical control layer 12 is reflected by the optical control layer 12 depends on the incident angle of the incident light.
  • the optical control layer 12 has a three-dimensional periodic structure which is a three-dimensional periodic structure.
  • the optical control layer 12 is a colloidal crystal film containing colloidal crystals.
  • the optical control layer 12 which is a colloidal crystal film is composed of a plurality of nanoparticles 12a and a base resin 12b holding the plurality of nanoparticles 12a.
  • the plurality of nanoparticles 12a (colloidal particles) are three-dimensionally and periodically and regularly arranged, and exist as colloidal crystals in the parent resin 12b.
  • the plurality of nanoparticles 12a cycle in the three axial directions of the thickness direction of the translucent member 11 and the biaxial direction (horizontal direction) parallel to the first main surface 11b of the translucent member 11. They are regularly arranged to form colloidal crystals. The plurality of nanoparticles 12a are uniformly arranged throughout the optical control layer 12.
  • the nanoparticles 12a are particles having a particle size of nanoorder size.
  • the particle diameters of the nanoparticles 12a contained in the optical control layer 12 are basically the same, but may vary slightly. Although the details will be described later, the optical action of the optical control layer 12 can be changed by adjusting the average particle size and / or the density of 12a of the plurality of nanoparticles contained in the optical control layer 12.
  • the plurality of nanoparticles 12a are, for example, translucent particles that transmit light.
  • the nanoparticles 12a which are translucent particles for example, inorganic particles such as silica particles made of SiO 2 may be used, or polymer particles such as polystyrene particles or acrylic particles may be used. In this embodiment, silica particles are used as the nanoparticles 12a.
  • the base resin 12b is a binder for fixing a plurality of nanoparticles 12a.
  • the base resin 12b is made of a translucent resin material.
  • the base resin 12b is made of a resin material that is transparent to visible light.
  • the base resin 12b may contain, for example, at least one selected from the group consisting of acrylic resin, polycarbonate resin, cycloolefin resin, epoxy resin, silicone resin, styrene resin and the like.
  • the optical control layer 12 which is a colloidal crystal film can be produced, for example, as follows.
  • silica particles are added to a monomer composed of triethylene glycol dimethacrylate (for example, "NK ester 3G” manufactured by Shin-Nakamura Chemical Industry Co., Ltd.) so as to have a content of 40%, and then ultrasonic dispersion is performed. By applying the treatment, the silica particles were dispersed in the monomer so as to be regularly arranged in three dimensions. In this way, a dispersion liquid in which the silica particles are uniformly dispersed in the monomer as colloidal particles is obtained. Next, 1.0% by weight of a photopolymerization initiator (for example, IRGACURE-1173 manufactured by IGM Resins BV) is added to this dispersion.
  • a photopolymerization initiator for example, IRGACURE-1173 manufactured by IGM Resins BV
  • this dispersion liquid is applied to a translucent member 11 (for example, a 200 mm square and 10 mm thick acrylic substrate) using a bar coater to form a coating film.
  • a bar coater having a count of # 10.
  • a colloidal crystal film having colloidal crystals as the light control layer 12 can be produced on the surface of the translucent member 11.
  • the color of the colloidal crystal film thus produced differs when viewed in a plan view depending on the particle size of the plurality of nanoparticles 12a constituting the colloidal crystal.
  • the colloidal crystal film G produced by the above method using silica particles having an average particle diameter of 180 nm as nanoparticles 12a has a green color in a plan view.
  • the colloidal crystal film R produced by the above method using silica particles having an average particle diameter of 200 nm as nanoparticles 12a has a red color in a plan view.
  • FIGS. 3A and 3B are diagram showing a reflection spectrum of the colloidal crystal film G whose plan view is green.
  • FIG. 3B is a diagram showing a reflection spectrum of the colloidal crystal film R whose plan view is red.
  • the reflection spectrum measurements were measured for each incident angle with the incident angles set to 5 °, 15 °, and 30 °.
  • the reflection spectrum was measured with the measurement option ARMV-734 using a spectrophotometer (V-650) manufactured by JASCO Corporation.
  • both the colloidal crystal film G and the colloidal crystal film R have a reflection wavelength selectivity in which the wavelength of the reflected light depends on the incident angle of the incident light.
  • the peak wavelength of the reflected light is about 570 nm when the incident angle is 5 °, and the reflected light is when the incident angle is 15 °.
  • the peak wavelength of the reflected light is about 560 nm and the incident angle is 30 °.
  • the peak wavelength of the reflected light is about 540 nm.
  • the colloidal crystal film G has a reflection wavelength range in the range of green to yellowish green. It is considered that the specular reflection wavelength (incident angle is 0 °) of the colloidal crystal film G exists in the range of 570 nm or more and 580 nm or less.
  • the colloidal crystal film R has a reflection wavelength region in the red range. It is considered that the specular reflection wavelength (incident angle is 0 °) of the colloidal crystal film R exists in the range of 645 nm or more and 655 nm or less.
  • the light source 20 emits light toward the light guide body 10. Specifically, the light source 20 emits light toward at least one end face of the translucent member 11 of the light guide body 10. In the present embodiment, the light source 20 emits light toward the first end surface 11a of the translucent member 11. Therefore, the light emitted from the light source 20 is incident on the first end surface 11a of the translucent member 11. In the present embodiment, the optical axis of the light source 20 is perpendicular to the first end surface 11a of the translucent member 11 and parallel to the first main surface 11b of the translucent member 11.
  • the light source 20 is arranged so as to face the first end surface 11a of the translucent member 11. That is, the light source 20 and the translucent member 11 have an edge light structure. Specifically, the light emitting surface of the light source 20 faces the first end surface 11a of the translucent member 11.
  • the light source 20 is an LED module including a light emitting diode (LED; Light Emitting Diode).
  • LED Light Emitting Diode
  • the light source 20 emits white light. Therefore, the white light emitted from the light source 20 is incident on the first end surface 11a, which is the light incident surface of the translucent member 11.
  • the light source 20 has a light emitting element 21 and a mounting substrate 22 on which the light emitting element 21 is mounted.
  • One or more light emitting elements 21 are mounted on the mounting substrate 22.
  • a plurality of light emitting elements 21 are mounted on the mounting substrate 22.
  • the mounting board 22 is a long board, for example, a wiring board in which metal wiring is formed in a predetermined pattern.
  • a resin substrate, a ceramic substrate, a metal substrate having an insulating coating, or the like can be used as the base substrate of the mounting substrate 22 .
  • the light emitting element 21 is an LED light source composed of LEDs. Specifically, the light emitting element 21 is a white LED light source that emits white light.
  • the light emitting element 21 is, for example, an individually packaged surface mount (SMD: Surface Mount Device) type LED element, and is a resin or ceramic white container (package) having a recess and a concave portion of the container. It includes one or more LED chips primarily mounted on the bottom and a sealing member that is filled in the recesses of the container to seal the LED chips.
  • the sealing member is made of a translucent resin material such as a silicone resin.
  • the sealing member may be a phosphor-containing resin containing a wavelength conversion material such as a phosphor.
  • the LED chip is an example of a semiconductor light emitting element that emits light by a predetermined DC power, and is a bare chip that emits a single color of visible light.
  • the LED chip is, for example, a blue LED chip that emits blue light when energized.
  • the sealing member contains a yellow phosphor such as YAG (yttrium aluminum garnet) that fluoresces the blue light from the blue LED chip as excitation light.
  • the light emitting element 21 in the present embodiment is a white LED element composed of a blue LED chip and a yellow phosphor.
  • the yellow phosphor absorbs a part of the blue light emitted by the blue LED chip and is excited to emit the yellow light, and this yellow light and the blue light not absorbed by the yellow phosphor are mixed. Becomes white light.
  • the sealing member is not limited to the yellow phosphor, and may contain a red phosphor and a green phosphor.
  • the plurality of light emitting elements 21 are arranged in a line on the mounting board 22 along the longitudinal direction of the mounting board 22.
  • the plurality of light emitting elements 21 arranged in a line shape function as a line light source that emits light in a line shape.
  • the plurality of light emitting elements 21 are mounted in a row at substantially equal intervals along the longitudinal direction of the mounting substrate 22.
  • Each light emitting element 21 is arranged on the mounting substrate 22 so that the main light emitting surface faces the first end surface 11a (light incident surface) of the translucent member 11.
  • the light emitting element 21 itself may be an LED element which is an LED chip (bare chip).
  • the light source 20 (LED module) has a COB (Chip On Board) structure in which the light emitting element 21 which is an LED chip is directly mounted on the mounting substrate 22.
  • COB Chip On Board
  • the light source 20 is an LED module having a COB structure, for example, a blue LED chip is used as the light emitting element 21, and a plurality of the blue LED chips are mounted in a row on the mounting substrate 22, and a silicone resin containing a yellow phosphor is contained.
  • the blue LED chips may be individually or collectively sealed by a sealing member made of.
  • a light distribution variable mechanism such as a lens that changes the light distribution of the light emitted from the light source 20, and a wavelength of the light emitted from the light source 20 are controlled. It may have an optical member such as a filter or a diffuser plate that scatters and transmits the light emitted from the light source 20.
  • the light source 20 is driven by electric power supplied from a power supply unit (not shown).
  • the power supply unit has, for example, a power supply (power supply circuit) composed of a circuit board on which a plurality of circuit components are mounted, and a housing for accommodating the power supply.
  • the power source converts the electric power received by the power supply unit into a predetermined electric power and supplies the electric power to the light source 20.
  • the light source 20 is driven to emit light.
  • the power supply unit may be included in the light emitting device 1 or may be provided separately from the light emitting device 1. Further, the light emitting device 1 may have a built-in power supply.
  • the light source 20 is arranged in the housing 30.
  • the housing 30 is, for example, a box-shaped storage member having an opening.
  • the housing 30 is made of, for example, a metal material or a resin material.
  • the light source 20 is arranged at the bottom of the housing 30.
  • the mounting board 22 of the light source 20 is mounted on the bottom surface of the housing 30.
  • the light source 20 and the housing 30 may be integrally configured as a light source unit.
  • the opening of the housing 30 is closed by the first end surface 11a of the light guide body 10, but the present invention is not limited to this.
  • the light emitted from the light source 20 is incident on the light guide body 10 from the end face of the light guide body 10 to guide the light and is emitted to the outside from the light guide body 10.
  • the light emitted from the light source 20 is incident from the first end surface 11a of the translucent member 11 to guide the inside of the translucent member 11, and a part of the light is emitted. It is incident on the optical control layer 12 from the first main surface 11b.
  • the light incident on the optical control layer 12 from the translucent member 11 receives an optical action on the optical control layer 12 and is emitted from the optical control layer 12 to the outside. Therefore, the outer surface of the optical control layer 12 is a surface (light emitting surface) from which light is extracted from the light emitting device 1.
  • the light of the light source 20 incident on the translucent member 11 includes not only the light emitted to the outside through the light control layer 12 but also the light emitted to the outside without passing through the light control layer 12. You may. For example, a part of the light of the light source 20 incident on the translucent member 11 may be emitted from the second main surface 11c and the second end surface 11d of the translucent member 11. As described above, not only the outer surface of the optical control layer 12 but also the second main surface 11c and the second end surface 11d of the translucent member 11 are formed on the surface (light emitting surface) from which the light is extracted from the light emitting device 1. It may be included.
  • the light extracted from the light emitting device 1 can be used as illumination light, for example.
  • the light emitting device 1 is a lighting device that irradiates the illumination light.
  • the light emitting device 1 can be used as a light guide type lighting device (light guide illumination).
  • the light extracted from the light emitting device 1 may be used as light other than the illumination light.
  • FIG. 4 is a diagram for explaining the optical action of the light emitting device 1X of Comparative Example 1.
  • FIG. 5 is a diagram for explaining the optical action of the light emitting device 1Y of Comparative Example 2.
  • FIG. 6 is a diagram for explaining the optical action of the light emitting device 1 according to the present embodiment.
  • the light emitting device 1X of Comparative Example 1 shown in FIG. 4 has a configuration in which the light control layer 12 is not provided in the light emitting device 1 of the present embodiment shown in FIG. That is, the light guide body 10X in the light emitting device 1X of Comparative Example 1 is composed of only the translucent member 11.
  • the light control layer 12 made of a colloidal crystal film is changed to the light control layer 12Y made of an optical multilayer film. It is configured to be replaced with. That is, the light guide body 10Y in the light emitting device 1Y of Comparative Example 2 is composed of the translucent member 11 and the optical control layer 12Y made of an optical multilayer film formed on the first main surface 11b of the translucent member 11. It is configured.
  • the optical multilayer film constituting the optical control layer 12Y has a structure in which a plurality of optical films are laminated in the thickness direction of the translucent member 11.
  • the optical control layer 12 is a first optical control layer 12R made of a colloidal crystal film R having a reflection spectrum shown in FIG. 3B.
  • the light emitted from the light source 20 is transparent. It is incident on the translucent member 11 from the first end surface 11a of the optical member 11.
  • the light color of the light extracted from the first main surface 11b or the second main surface 11c of the translucent member 11 is the first main surface 11b and
  • the color of the light emitted from the light source 20 is the same when the second main surface 11c is viewed from any angle.
  • the light color of the light extracted from the first main surface 11b or the second main surface 11c of the translucent member 11 is at a viewing angle. It is white light without dependence.
  • a part of the light guiding the translucent member 11 passes through the first main surface 11b and the light control layer. It is taken out of the light guide body 10Y via 12Y, and is taken out of the light guide body 10Y through the second main surface 11c without passing through the light control layer 12Y.
  • some of the light that guides the translucent member 11 is guided through the translucent member 11 while repeating total reflection on the first main surface 11b and the second main surface 11c. It shines and is not removed from the first main surface 11b or the second main surface 11c.
  • the optical control layer 12Y is composed of an optical multilayer film having a periodic structure, but the optical multilayer film constituting the optical control layer 12Y is translucent. Since the structure is periodic only in the thickness direction of the member 11, that is, the one-dimensional periodic structure, the light incident on the optical control layer 12Y from the translucent member 11 is the light emitting device 1 according to the present embodiment described later. It is considered that the light does not undergo such a diffraction effect.
  • a part of the light that guides the translucent member 11 is transmitted through the first main surface 11b. It is taken out of the light guide body 10 via the control layer 12 and is taken out of the light guide body 10 through the second main surface 11c without passing through the light control layer 12.
  • the optical control layer 12 is composed of the colloidal crystal film R containing the colloidal crystals having a three-dimensional periodic structure, the first main surface of the translucent member 11
  • the colloidal crystal film constituting the optical control layer 12 is formed. It is subjected to optical action by R and is taken out from the light guide body 10.
  • the optical control layer 12 has a period in three axial directions, that is, the thickness direction of the translucent member 11 and the biaxial direction (horizontal direction) parallel to the first main surface 11b of the translucent member 11. It has a colloidal crystal composed of a plurality of nanoparticles 12a that are regularly arranged in a uniform manner.
  • the light incident on the optical control layer 12 from the first main surface 11b of the translucent member 11 is diffracted by the optical control layer 12 and taken out from the light guide body 10 as diffracted light ⁇ .
  • the light emitting device 1 shown in FIG. 6 the light color of the light that guides the translucent member 11 and enters the light control layer 12 from the first main surface 11b and is taken out from the light control layer 12 is determined. The color differs depending on the viewing angle of the optical control layer 12.
  • the optical control layer 12 is composed of the colloidal crystal film R having the reflection spectrum shown in FIG. 3A
  • the light extracted from the optical control layer 12 is as shown in FIGS. 7 and 8.
  • the light has a wide range of hues from the red wavelength to the blue wavelength depending on the viewing angle of the optical control layer 12.
  • the diffracted light of red light reaches the eyes of the user of the viewpoint P1 from the optical control layer 12
  • the diffracted light of green light reaches the eyes of the user of the viewpoint P2
  • the diffracted light of the green light reaches the eyes of the user of the viewpoint P3.
  • the diffracted light of blue light reaches from the light control layer 12. That is, the light control layer 12 looks red, green, or blue depending on the viewing angle of the light control layer 12.
  • the translucent member 11 On the other hand, of the light incident on the translucent member 11, the translucent member 11 is guided and transmitted through the second main surface 11c, and is taken out of the light guide body 10 without passing through the optical control layer 12. The light is emitted to the outside from the second main surface 11c of the translucent member 11 without being subjected to the optical action of the optical control layer 12. Therefore, since this light is not diffracted by the light control layer 12, the light color of this light is the same as the light color of the light emitted from the light source 20 regardless of the viewing angle.
  • the light incident on the translucent member 11 also includes the light emitted to the outside from the second main surface 11c of the translucent member 11 due to the optical action of the optical control layer 12.
  • the light that is completely reflected and returned to the translucent member 11 is emitted to the outside from the second main surface 11c of the translucent member 11.
  • the light extracted to the outside from the second main surface 11c of the translucent member 11 includes not only the light that is not subjected to the optical action of the optical control layer 12 but also the light that is subjected to the optical action of the optical control layer 12. included. Therefore, the color of the light taken out from the second main surface 11c of the translucent member 11 also differs depending on the viewing angle of the translucent member 11. Specifically, the light has a wide range of hues from the red wavelength to the blue wavelength depending on the viewing angle of the translucent member 11 as in the case of viewing the light control layer 12. That is, the translucent member 11 looks red, green, or blue depending on the angle at which the second main surface 11c of the translucent member 11 is viewed.
  • the light emitting device 1 shown in FIG. 6 since the light incident on the light control layer 12 is diffracted by the light control layer 12, the light is controlled from the translucent member 11 as in the light emitting device 1Y shown in FIG. Even if the light is incident on the layer 12 at an angle of total reflection, the light control layer 12 is diffracted with almost no total reflection. That is, as shown in FIG. 6, the light incident on the light control layer 12 from the translucent member 11 is substantially diffracted light ⁇ regardless of the incident angle, and reflected light ⁇ 'is not generated so much. Therefore, the light emitting device 1 shown in FIG. 6 can also improve the light extraction efficiency as compared with the light emitting device 1X shown in FIG. 4 and the light emitting device 1Y shown in FIG.
  • the light source 10 is guided by emitting light from the light source 20.
  • the color of the light extracted from the light guide body 10 differs depending on the viewing angle of the light guide body 10. Therefore, the light guide body 10 looks red, green, or blue depending on the angle at which the outer surface of the light guide body 10 is viewed. That is, it seems that the emission color of the light guide body 10 changes by changing the viewing angle of the light guide body 10.
  • the light emitting device 1 shown in FIG. 9 similarly to the light emitting device 1 shown in FIG. 6, on the end surface of the light guide body 10 in which the light control layer 12 is formed on the first main surface 11b of the translucent member 11. Since the light of the light source 20 is incident, the light incident on the light control layer 12 from the translucent member 11 is diffracted into diffracted light. As a result, the light extracted from the light guide body 10 has a different color depending on the viewing angle.
  • the light control layer 12 made of a colloidal crystal film can extract light having a wavelength shorter than the specular reflection wavelength. Therefore, in the light emitting device 1 shown in FIG. 9, since the second light control layer 12G made of the colloidal crystal film G whose normal reflection wavelength exists in the yellow-green wavelength region is used as the light control layer 12, it is yellowish green. Light having a wavelength shorter than the wavelength is emitted from the light guide body 10 as diffracted light.
  • the light extracted from the light guide body 10 is diffracted green light or diffracted blue light. It becomes. That is, the light guide body 10 may appear green or blue depending on the viewing angle of the light guide body 10.
  • the red diffracted light is not generated even if light is incident, so that the red light, which is the red component of the white light that guides the light guide body 10, is light.
  • the light is guided through the translucent member 11 without being taken out from the control layer 12.
  • the red light that guides the inside of the translucent member 11 is emitted to the outside from, for example, the second main surface 11c or the second end surface 11d of the translucent member 11. That is, by using the colloidal crystal film G instead of the colloidal crystal film R as the optical control layer 12, the red light is not emitted to the outside from the optical control layer 12 and is a translucent member for the optical control layer 12. It can be emitted to the outside from the light guide body 10 at a location other than the location where the optical control layer 12 is provided by receiving an optical action such that it is confined inside the 11.
  • the light emitting device 1 shown in FIG. 9 can extract light having a specific wavelength different depending on the viewing angle, similarly to the light emitting device 1 shown in FIG. 6, but the light emitting device 1 shown in FIG. In the device 1, light of a part of wavelengths can be selectively extracted from the light control layer 12, and light of a part of other wavelengths can be confined in the light guide body 10. Specifically, in the light emitting device 1 shown in FIG. 9, light in the wavelength range from blue to green can be selectively extracted from the optical control layer 12, and light having a wavelength longer than that of green is used. Light in the red wavelength region) can be confined in the translucent member 11 and then selectively extracted from the second end face 11d of the translucent member 11.
  • the wavelength of light extracted from the optical control layer 12 can be controlled by the composition of the colloidal crystals contained in the colloidal crystal film constituting the optical control layer 12. Further, depending on the composition of the colloidal crystals contained in the colloidal crystal film constituting the optical control layer 12, a specific wavelength can be confined in the translucent member 11.
  • the light emitting device 1 according to the present embodiment may be used as an illumination device that irradiates illumination light having a different color depending on the viewing angle, or may be used as a color change light guide device that guides light of a different color depending on the viewing angle. Not only that, it can also be used as a narrow band wavelength selection filter, a spectroscopic prism, or the like. Further, since the light having a specific wavelength can be confined in the translucent member 11 as in the light emitting device 1 shown in FIG. 9, the light emitting device 1 according to the present embodiment transmits the light having a specific wavelength. It can also be used as an optical transmission device having an optical waveguide.
  • the angle dependence of the hue of the light extracted from the optical control layer is determined.
  • the angle dependence of the emission intensity was measured.
  • the case where the colloidal crystal film G having the reflection spectrum shown in FIG. 3A is used as the light control layer 12 is referred to as “Example 1”, and the light control layer 12 is shown in FIG.
  • the case where the colloidal crystal film R having the reflection spectrum shown in 3B was used was designated as “Example 2”.
  • the light guide body 10X in which the light control layer 12 (colloidal crystal film) is not formed on the translucent member 11 and only the translucent member 11 is used is used.
  • FIG. 10 is a diagram for explaining the outline of this experiment.
  • an aluminum tape is attached to the second end face 11d so that light is not emitted from the second end face 11d.
  • White light was incident on the end face of the light guide body 10 from the light source 20 which is a line light source, and the light control layer 12 of the light guide body 10 was made to emit light.
  • the emission spectrum of the optical control layer 12 at that time was measured with a spectrophotometer 100 (MCPD-7000 manufactured by Otsuka Electronics Co., Ltd.), the chromaticity was calculated from the emission spectrum, and the emission intensity was calculated.
  • MCPD-7000 manufactured by Otsuka Electronics Co., Ltd.
  • the X-axis direction perpendicular to the outer surface of the optical control layer 12 is set to 90 °, and the Y-axis
  • the Y-axis When the positive direction is 0 ° and the negative direction of the Y axis is 180 °, each measurement direction is 30 °, 45 °, 60 °, 90 °, and 120 ° on the XY plane.
  • the emission spectrum in was measured.
  • the measurement direction means the direction when the user looks at the light guide body 10.
  • the chromaticity is indicated by the chromaticity coordinates in the xy chromaticity diagram of the CIE 1931 color space.
  • the emission spectrum of the light emitting device 1X of Comparative Example 1 was measured by the same method as that of the light emitting device 1 according to the present embodiment shown in FIG.
  • a transparent acrylic substrate having a thickness of 10 mm was used in both the light emitting device 1 in the present embodiment and the light emitting device 1X of Comparative Example 1.
  • the light source 20 used in this experiment a white light source having an emission spectrum shown in FIG. 11 was used.
  • the light source 20 used in this experiment is a blue light emitting diode that emits blue light having an emission peak wavelength of about 455 nm and a YAG that emits yellow-green fluorescence having an emission peak wavelength of about 545 nm.
  • It is an LED module having a white LED element that emits white light including a phosphor.
  • a red phosphor having an emission peak wavelength of about 615 nm is also added to the white LED element in the light source 20.
  • the emission peak wavelength does not change even if the angle in the measurement direction changes, and is the same as the emission peak wavelength of the emission spectrum of the light source 20.
  • each chromaticity for each angle in the measurement direction does not change much from the chromaticity of the light source 20, and does not change much even if the angle in the measurement direction changes.
  • the light emitting spectrum shown in FIG. 14 and the chromaticity shown in FIG. 15 were obtained for each angle in the measurement direction. .. As shown in FIGS. 14 and 15, it can be seen that the light emitting device 1 of the first embodiment has an angle dependence on the light emitting spectrum and the chromaticity.
  • the blue emission peak wavelength among the plurality of emission peak wavelengths does not change even if the angle in the measurement direction changes, but the emission peak wavelengths of the plurality of emission peak wavelengths do not change. It can be seen that the other peak wavelengths change according to the angle in the measurement direction. Further, as shown in the chromaticity diagram of FIG. 15, it can be seen that each chromaticity for each angle in the measurement direction changes as the angle in the measurement direction changes.
  • the chromaticity changes beyond the white region, and as the angle in the measurement direction changes, the yellow-green region (30 °) ⁇ the white region (45 °) ⁇ the bluish-purple region (60 °) ⁇ It changes to a white region (90 °, 120 °).
  • light of different colors can be seen depending on the viewing angle of the light guide body 10. That is, light of a different color is extracted from the light guide body 10 depending on the angle. Specifically, light can be extracted as gradation light whose color changes continuously.
  • the light emitting spectrum shown in FIG. 16 and the chromaticity shown in FIG. 17 were obtained for each angle in the measurement direction. ..
  • FIGS. 16 and 17 it can be seen that the light emitting device 1 of the second embodiment also has an angle dependence on the light emitting spectrum and the chromaticity as in the light emitting device 1 of the first embodiment.
  • the blue emission peak wavelength among the plurality of emission peak wavelengths does not change even if the angle in the measurement direction changes, but the emission peak wavelengths of the plurality of emission peak wavelengths do not change. It can be seen that the other peak wavelengths change according to the angle in the measurement direction. Further, as shown in the chromaticity diagram of FIG. 17, it can be seen that each chromaticity for each angle in the measurement direction changes as the angle in the measurement direction changes.
  • the chromaticity changes beyond the white region, and as the angle in the measurement direction changes, the orange region (30 °) ⁇ the yellow-green region (45 °) ⁇ the blue-green region (60 °) ⁇ It changes from a white region (90 °) to a yellow-green region (120 °).
  • the more it is viewed from an oblique direction the more it changes to colored light. Specifically, light can be extracted as gradation light whose color changes continuously.
  • FIG. 18 shows the angle dependence of the light emission intensity of the light extracted from the light control layer 12 for the light emitting device 1 of Examples 1 and 2.
  • the light emitting device 1 of Examples 1 and 2 and the light emitting device 1X of Comparative Example 1 were measured with a spectrophotometer 100 in each measurement direction of 30 °, 45 °, 60 °, 90 °, and 120 °.
  • the emission spectrum of the relative emission intensity (emission intensity ratio) of the light emission devices 1 of Examples 1 and 2 with respect to the light emission device 1X of Comparative Example 1 is shown.
  • FIG. 18 shows the angle dependence of the light emission intensity of the light extracted from the light control layer 12 for the light emitting device 1 of Examples 1 and 2.
  • the black square indicates the light emitting intensity of the light emitting device 1 of Example 1 / the light emitting intensity of the light emitting device of Comparative Example 1
  • the white circle indicates the light emitting intensity of the light emitting device 1 of Example 2.
  • the emission intensity of Comparative Example 1 is shown.
  • the light control layer 12 made of a colloidal crystal film As shown in FIG. 18, by forming the light control layer 12 made of a colloidal crystal film on the translucent member 11, light having a specific wavelength is taken out according to the angle in the measurement direction and emitted from the light guide body 10. It can be seen that the efficiency of extracting the light is improved. In this case, the wavelength of the extracted light depends on the composition of the colloidal crystal film.
  • the light emitting device 1 of Examples 1 and 2 has improved light extraction efficiency in the entire wavelength range of the visible light region as compared with the light emitting device 1X of Comparative Example 1.
  • the light emitting device 1 of the first embodiment it can be seen that the light having a peak wavelength of about 555 nm is rapidly extracted and the light extraction efficiency is greatly improved.
  • the light emitting device 1 of the second embodiment the light having a peak wavelength of about 640 nm is rapidly extracted, and the light extraction efficiency is greatly improved.
  • the light emitting device 1 of Examples 1 and 2 has improved light extraction efficiency in the entire wavelength range of the visible light region as compared with the light emitting device 1X of Comparative Example 1. You can see that there is. In particular, in the light emitting device 1 of the first embodiment, it can be seen that the light having a peak wavelength of about 470 nm is rapidly extracted and the light extraction efficiency is greatly improved. Further, it can be seen that in the light emitting device 1 of the second embodiment, the light having a peak wavelength of about 555 nm is rapidly extracted, and the light extraction efficiency is greatly improved.
  • the light emitting device 1 of Examples 1 and 2 has improved light extraction efficiency in the entire wavelength range of the visible light region as compared with the light emitting device 1X of Comparative Example 1. You can see that there is. In particular, in the light emitting device 1 of the first embodiment, it can be seen that the light having a peak wavelength of around 460 nm is rapidly extracted and the light extraction efficiency is greatly improved. Further, it can be seen that in the light emitting device 1 of the second embodiment, the light having a peak wavelength of about 470 nm is rapidly extracted, and the light extraction efficiency is greatly improved.
  • the light emitting device 1 of Examples 1 and 2 has improved light extraction efficiency in the entire wavelength range of the visible light region as compared with the light emitting device 1X of Comparative Example 1. You can see that there is.
  • the light emitting device 1 of Examples 1 and 2 has improved light extraction efficiency in the visible light region wavelength of 600 nm or less as compared with the light emitting device 1X of Comparative Example 1. You can see that. In particular, it can be seen that in the light emitting device 1 of the first embodiment, light in the visible light region having a wavelength of 500 nm or less is extracted, and the light extraction efficiency is greatly improved. Further, it can be seen that in the light emitting device 1 of the second embodiment, light having a peak wavelength of about 540 nm is extracted, and the light extraction efficiency is greatly improved.
  • the positional relationship between the light control layer 12 having reflection wavelength selectivity, the translucent member 11 having translucency, and the light source 20 is devised. .. Specifically, a light control layer 12 is provided on at least a part of the surface of the translucent member 11 to form a light guide body 10, and light is directed toward the first end surface 11a of the translucent member 11.
  • the light source 20 is arranged so as to emit light.
  • the light emitted from the light source 20 and incident on the inside of the translucent member 11 from the first end surface 11a guides the inside of the translucent member 11 and enters the optical control layer 12.
  • the optical control layer 12 has a reflection wavelength selectivity in which the wavelength of the reflected light depends on the incident angle of the incident light
  • the light incident on the optical control layer 12 from the translucent member 11 is light. It is emitted from the light guide body 10 by being subjected to an optical action due to the reflection wavelength selectivity of the control layer 12.
  • the light emitted from the light guide body 10 has a different color depending on the viewing angle of the light guide body 10. That is, the emission color of the light guide body 10 changes according to the viewing angle.
  • the color of the light guide body 10 changes depending on the viewing angle, and light of a specific wavelength different from the viewing angle can be extracted. You can take out the light with. For example, light can be extracted as gradation light whose color changes continuously by changing the viewing angle.
  • the optical control layer 12 has a three-dimensional periodic structure.
  • the optical control layer 12 is composed of a colloidal crystal film containing colloidal crystals.
  • the light incident on the optical control layer 12 from the translucent member 11 is diffracted by the three-dimensional periodic structure of the optical control layer 12 to generate diffracted light having a specific wavelength according to the angle.
  • Light having a specific wavelength different from that of the light guide body 10 can be extracted from the light guide body 10.
  • the colloidal crystal film R having the reflection spectrum shown in FIG. 3B as the optical control layer 12, white light is incident on the translucent member 11 from the light source 20 and white light is incident on the optical control layer 12. Then, in the optical control layer 12, diffracted light including wavelengths in the blue region to the red region such as red light, green light, and blue light is generated. As a result, the light guide body 10 looks red, green, or blue depending on the viewing angle.
  • the light control layer 12 made of a colloidal crystal film can extract light having a wavelength shorter than that of the specular reflection wavelength. Therefore, by using the colloidal crystal film G having the reflection spectrum shown in FIG. 3A as the light control layer 12, white light is incident on the translucent member 11 from the light source 20 and white light is emitted to the light control layer 12.
  • the light control layer 12 When incident, the light control layer 12 generates diffracted green light and blue light, and the light guide body 10 looks green or blue depending on the viewing angle.
  • the light control layer 12 diffracts the red light. Since no light is generated, the red light is confined in the translucent member 11 without being emitted to the outside from the light control layer 12. In the present embodiment, the red light trapped in the translucent member 11 is emitted to the outside from the second end surface 11d of the translucent member 11.
  • the light emitting device 1 in the present embodiment the light having a specific wavelength incident on the translucent member 11 is emitted from the optical control layer 12, and the light having another specific wavelength is transmitted.
  • Light is taken out by a new taking-out method in which light can be selectively confined in the light-transmitting member 11 and then emitted to the outside from a place different from the place where the light control layer 12 of the light-transmitting member 11 is provided. Can be done. Therefore, the light emitted from the light source 20 can be separated according to the wavelength. In this case, by transmitting the confined light, it is possible to realize a light emitting device having both functions of a lighting device and an optical transmission device.
  • the composition of the colloidal crystal film is devised to specify the light.
  • the finding that other specific wavelengths can be confined while emitting the wavelength of the above from the colloidal crystal film is also an epoch-making unprecedented one found by the present inventors.
  • the light emitting device 1 in the present embodiment not only the light of a specific wavelength different from the viewing angle is extracted or the light of a specific wavelength is confined, but also the light extraction efficiency is improved as described above. It also turned out that it could be improved. That is, it is possible to extract light by a new extraction method in which light of a specific wavelength different from the viewing angle can be extracted or light of a specific wavelength can be confined while improving the light extraction efficiency.
  • the present invention also finds that the light extraction efficiency is improved when light is incident on the first end surface 11a of the translucent member 11 on which the colloidal crystal film is formed on the first main surface 11b. It is an epoch-making thing that has never been seen before.
  • the colloidal crystal film can be formed by a coating method, a large-area optical control layer 12 can be easily formed. Therefore, by using the colloidal crystal film, the area of the light emitting device 1 can be easily increased. Further, since the colloidal crystal film can be formed without requiring special microfabrication, it can be formed at low cost. Therefore, the light emitting device 1 whose color changes depending on the viewing angle can be manufactured at low cost.
  • the optical control layer 12 made of a colloidal crystal film is preferably 5 ⁇ m or more and 100 ⁇ m or less in thickness.
  • the thickness of the optical control layer 12 made of the colloidal crystal film is preferably 5 ⁇ m or more and 100 ⁇ m or less.
  • the colloidal crystal film constituting the optical control layer 12 has a specific specular reflection wavelength and a reflection wavelength range in a certain range.
  • the reflection wavelength range and the specular reflection wavelength of the colloidal crystal film are changed by changing the average particle diameter of the nanoparticles 12a contained in the optical control layer 12, but the present invention is not limited to this.
  • the concentration of the nanoparticles 12a contained in the colloidal crystal film (light control layer 12) may be changed, the material of the nanoparticles 12a contained in the colloidal crystal film (light control layer 12) may be changed, or a plurality of particles having different average particle diameters may be changed.
  • the normal reflection wavelength and the reflection wavelength range of the colloidal crystal film can be changed by using the nanoparticles 12a of the above or by combining these elements. That is, the reflection wavelength range and the specular reflection wavelength of the colloidal crystal film can be arbitrarily designed. In this case, as described above, the colloidal crystal film can extract light having a wavelength shorter than the normal reflection wavelength.
  • a colloidal crystal film having a reflection wavelength range at (610 nm to 900 nm) may be formed, and if the degree of color change is to be reduced, a colloidal crystal having a reflection wavelength range from a bluish green region to an orange region (500 nm to 600 nm) may be formed.
  • a film may be formed.
  • the particle arrangement structure of the colloidal crystal of the colloidal crystal film may be a three-dimensional periodic structure having perfect periodicity or a three-dimensional periodic structure having no perfect periodicity.
  • the colloidal crystal has a perfect periodic structure, strong diffracted light is generated in a specific direction due to the relationship between the wavelength and the particle arrangement period, and a light emitting device having a large color change depending on the viewing angle can be obtained.
  • the colloidal crystal does not have a perfect periodic structure but a structure in which the period is partially disturbed, the diffracted light generated in a specific direction is weakened and a light emitting device having a small color change can be obtained.
  • the concept of colloidal crystals in the colloidal crystal film may include a colloidal solid solution.
  • a colloidal solid solution is one in which nanoparticles are colloidally crystallized and have a crystal structure similar to that of a solid solution.
  • nanoparticles, which are colloidal particles form a regular array structure and form an aggregate like a solid solution.
  • the optical control layer 12 is directly formed on the translucent member 11, but the present invention is not limited to this.
  • a light control sheet in which a light control film made of a colloidal crystal film is formed on a transparent base material such as a transparent film is used, and this light control sheet is used as an adhesive or the like on a light transmissive member 11. You may stick them together.
  • the optical control layer 12 is formed on the entire surface of the first main surface 11b of the translucent member 11, but the present invention is not limited to this.
  • the light control layer 12 may be formed on a part of the surface of the translucent member 11.
  • a light guide body 10A in which a rectangular optical control layer 12A is formed on a part of a first main surface 11b of the translucent member 11 is provided. You may use it.
  • an optical control layer 12B having a pattern such as a character or a pattern is formed on a part of the first main surface 11b of the translucent member 11.
  • the light guide body 10B may be used.
  • the optical control layer 12 provided on the translucent member 11 is any one of the colloidal crystal film G and the colloidal crystal film R, but the present invention is not limited to this.
  • the first main surface 11b of the translucent member 11 is composed of a first optical control layer 12R made of a colloidal crystal film R and a colloidal crystal film G.
  • the first main surface 11b of the translucent member 11 is composed of a first optical control layer 12R made of a colloidal crystal film R and a colloidal crystal film G.
  • a light guide body 10D having a light control layer 12D formed of a multilayer film in which a second light control layer 12G is laminated may be used. That is, as the optical control layer 12C, a laminated film in which a plurality of optical control films each having a reflection wavelength selectivity are laminated may be used. As a result, it is possible to realize a light emitting device having abundant color changes according to the viewing angle.
  • FIG. 20 is a cross-sectional view of the light emitting device 1E according to the second embodiment.
  • the light emitting device 1E directs the light guiding the translucent member 11 toward the first main surface 11b in the light emitting device 1 according to the first embodiment.
  • the reflective portion that reflects is provided on the second main surface 11c of the translucent member 11.
  • the light emitting device 1E is a translucent member 11E having a reflective portion formed to reflect light that guides the inside of the translucent member 11E toward the first main surface 11b.
  • a light guide body 10E having the light control layer 12 and the light source 20 and a light source 20 are provided.
  • a plurality of reflecting portions that reflect the light that guides the inside of the translucent member 11E toward the first main surface 11b are formed on the second main surface 11c of the translucent member 11E. It is a recess 11c1 of.
  • each of the plurality of recesses 11c1 is a reflecting prism having a reflecting surface that reflects light that guides the inside of the translucent member 11E toward the first main surface 11b.
  • Each of the plurality of recesses 11c1 is a fine recess formed by surface-processing the second main surface 11c of the translucent member 11E by, for example, laser or etching.
  • each of the plurality of recesses 11c1 has a triangular cross-sectional shape, and is, for example, a recess such as a cone, a triangular prism, a triangular pyramid, or a square pyramid.
  • the translucent member 11E in the present embodiment has the same configuration as the translucent member 11 in the first embodiment, except that the recess 11c1 is formed.
  • the light emitting device 1E according to the present embodiment is provided with the light control layer 12 on at least a part of the surface of the translucent member 11E to guide the light emitting device 1E according to the first embodiment.
  • the body 10E comprises a light source 20 arranged to emit light toward the first end face 11a of the translucent member 11E.
  • the light emitting device 1E according to the present embodiment has the same effect as the light emitting device 1 according to the above embodiment 1. For example, it has the effect of extracting light of a specific wavelength that differs depending on the viewing angle, confining light of a specific wavelength, and improving the light extraction efficiency.
  • the second main of the translucent member 11E is used as a reflecting portion that reflects the light that guides the inside of the translucent member 11E toward the first main surface 11b.
  • a plurality of recesses 11c1 are formed on the surface 11c.
  • the plurality of recesses 11c1 are formed so as to be uniformly scattered in dots at equal pitches over the entire second main surface 11c.
  • the plurality of recesses 11c1 may be formed as a part of the second main surface 11c by changing the density distribution or the like.
  • a region in which the recess 11c1 is formed and a region in which the recess 11c1 is not formed may be provided on the second main surface 11c.
  • the amount of light emitted from the light control layer 12 (light guide body 10E) at the portion facing the region where the recess 11c1 is formed can be increased, and the brightness of the light emitting device 1E can be partially increased. Can be done.
  • a plurality of recesses 11c1 may be formed so that the density distribution of the recesses 11c1 changes from sparse to dense as the distance from the light source 20 increases. As a result, light can be uniformly extracted from the entire light guide body 10E, and the brightness uniformity of the light emitting device 1E can be improved. Further, as shown in FIG.
  • the recess 11c1 may be formed on the second main surface 11c which is a curved surface. Thereby, the brightness of the light emitting device 1E can be partially changed. In this way, by devising the pattern of the plurality of recesses 11c1, light is uniformly extracted from the entire light guide body 10E, the brightness is partially increased to extract light, and the amount of light extracted is adjusted depending on the part. can do.
  • the light that guides the inside of the translucent member 11E is formed on the second main surface 11c of the translucent member 11E as a reflecting portion that reflects the light toward the first main surface 11b.
  • a plurality of recesses 11c1 were used, but the present invention is not limited to this.
  • a plurality of reflective dots printed on the second main surface 11c of the translucent member 11E are used as a reflecting portion that reflects the light that guides the inside of the translucent member 11E toward the first main surface 11b. You may use it.
  • the optical control layer 12 is formed on only one surface of the first main surface 11b of the translucent members 11 and 11E, but the present invention is not limited to this.
  • the light guide body 10F of the light emitting device 1F in this modification has a configuration in which the optical control layers 12 are provided on both sides of the first main surface 11b and the second main surface 11c of the translucent member 11. There is. With this configuration, it is possible to improve the extraction efficiency of light of a specific wavelength extracted according to the viewing angle.
  • the optical control layer 12 formed on the first main surface 11b and the optical control layer 12 formed on the second main surface 11c may be the same or different.
  • both the optical control layer 12 formed on the first main surface 11b and the optical control layer 12 formed on the second main surface 11c may be a colloidal crystal film R or a colloidal crystal film G, or a first.
  • the optical control layer 12 formed on the main surface 11b of 1 is one of the colloidal crystal film R and the colloidal crystal film G
  • the optical control layer 12 formed on the second main surface 11c is the colloidal crystal film R and the colloidal crystal film. It may be the other of G.
  • the number of light sources 20 is one, but the number of light sources 20 may be plural.
  • two light sources 20 are used, and one light source 20 is arranged so as to face the first end surface 11a of the translucent member 11.
  • the other light source 20 may be arranged so as to face the second end surface 11d of the translucent member 11.
  • light can be incident on the translucent member 11 from the left and right end faces of the first end surface 11a and the second end surface 11d of the translucent member 11, so that the color of the light extracted from the light guide body 10 can be incident.
  • the change in degree can be made symmetrical.
  • each light source 20 may be arranged so as to face each of the above.
  • light can be incident on the translucent member 11 from the four end faces of the translucent member 11 in the vertical and horizontal directions, so that the change in chromaticity of the light extracted from the light guide body 10 is symmetrical in the vertical and horizontal directions. be able to.
  • the optical axis of the light source 20 is parallel to the first main surface 11b of the translucent member 11, and the optical axis of the light source 20 does not change.
  • an optical axis adjusting mechanism 40 for adjusting the optical axis of the light source 20 may be provided.
  • the optical axis adjusting mechanism 40 is, for example, a drive device capable of rotating a housing 30 for accommodating a light source 20, and is composed of an actuator or the like.
  • the direction of the light incident on the first end surface 11a of the translucent member 11 from the light source 20 is adjusted by rotating the housing 30 by the optical axis adjusting mechanism 40 to adjust the direction of the optical axis of the light source 20. be able to.
  • the direction of the optical axis of the light source 20 in this way, the color of the light extracted from the light guide body 10 can be changed. Therefore, by changing the direction of the optical axis of the light source 20, the color of the light emitted from the light guide body 10 can be changed without changing the viewing angle of the light guide body 10. That is, according to the light emitting device 1I according to the present modification, the light emitting color appears to change even when the light emitting device 1I is viewed from the same viewpoint.
  • the angle at which the light guide body 10 is viewed can be changed by using a light distribution variable mechanism that changes the light distribution of the light emitted from the light source 20 instead of changing the direction of the optical axis of the light source 20. It is possible to change the color of the light emitted from the light guide body 10. That is, by changing the light distribution angle of the light emitted from the light source 20 without changing the direction of the optical axis of the light source 20, it is possible to extract light having a specific wavelength different depending on the viewing angle.
  • the translucent member 11 is a flat plate-shaped substrate, but the present invention is not limited to this.
  • a rod-shaped light-transmitting member 11J may be used and the light guide body 10J may be a rod-shaped light guide rod.
  • the light control layer 12 may be formed on the entire side surface of the rod-shaped translucent member 11J to be formed in a cylindrical shape, but is formed on a part of the side surface of the rod-shaped translucent member 11J. You may.
  • the rod-shaped translucent member 11J is not limited to a rigid long columnar body, and may be a flexible member such as an optical fiber.
  • the rod-shaped light guide body 10J By forming the rod-shaped light guide body 10J in this way, it is possible to realize a light emitting device 1J having a high design by curving it in a curved shape. Further, by using the colloidal crystal film G or the like as the optical control layer 12, the specific wavelength of the light incident on the translucent member 11J is emitted from the optical control layer 12, and the other specific wavelengths are emitted. Light can be selectively confined in the translucent member 11J, transmitted, and emitted from the second end surface 11d of the translucent member 11J. Therefore, it is possible to realize a light emitting device 1J having both functions of an illuminating device that irradiates the illumination light with a specific wavelength and an optical transmission device that transmits light of another specific wavelength. In this case, the translucent member 11J of the light guide body 10J serves as an optical waveguide (optical transmission path).
  • the optical control layer 12 is the outermost surface layer, and the outer surface (light extraction surface) of the optical control layer 12 is exposed and is an interface with the air layer.
  • the diffusion layer 50 may be formed on the outer surface (light extraction surface) of the light control layer 12.
  • the diffusion layer 50 is, for example, a milky white diffusion film in which fine particles that scatter and reflect incident light are dispersed.
  • the reflective sheet 60 may be further attached to the outer surface of the diffusion layer 50 as in the light emitting device 1L shown in FIG. 29.
  • the light diffracted by the light control layer 12 and diffused by the diffusing layer 50 is reflected by the reflective sheet 60, so that the light is not taken out from the diffusing layer 50 side of the translucent member 11, and the translucent member 11 Light will be extracted from the second main surface 11c.
  • the white light emitted from the light source 20 is incident on the transparent translucent member 11, so that the white light is incident on the optical control layer 12, but the present invention is not limited to this.
  • a blue light emitting element that emits blue light is used as the light emitting element 21M of the light source 20M, and the yellow phosphor 11M1 is contained as the translucent member 11M of the light guide body 10M.
  • a fluorescent plate made of the phosphor-containing resin 11M2 may be used.
  • the yellow phosphor 11M1 in the translucent member 11M is excited by the blue light emitted from the light source 20M and incident on the translucent member 11M to emit yellow light, and the blue light of the light source 20M and the yellow phosphor 11M1 Is mixed with the yellow light of the above, and white light is generated by the translucent member 11M.
  • the white light generated by the translucent member 11M is incident on the light control layer 12 and diffracted, and light having a specific wavelength different depending on the viewing angle is extracted from the light guide body 10M.
  • the present invention is not limited to the case where the blue light emitting element and the yellow phosphor generate white light, and the combination of the blue light emitting element and the red phosphor and the green phosphor may generate white light or emits ultraviolet light.
  • White light may be generated by a combination of a UV light emitting element and a plurality of types of phosphors.
  • the phosphor may be a fluorescent pigment or a fluorescent dye.
  • the light guide body 10 is composed of a translucent member 11 and an optical control layer 12 provided on the surface of the translucent member 11, but the present invention is not limited to this. ..
  • the light guide body 10N may be composed of the translucent member 11N and a plurality of nanoparticles 12a contained in the translucent member 11.
  • the light guide body 10N is a bulk body containing a plurality of nanoparticles 12a as colloidal crystals.
  • the translucent member 11N is made of, for example, a translucent resin material.
  • the second main surface 11c of the translucent member 11 is exposed to the outside, but the present invention is not limited to this.
  • the second main surface 11c of the translucent member 11 may be covered with a part of the housing 30O.
  • the portion of the housing 30O that covers the second main surface 11c of the translucent member 11 may have light reflectivity.
  • the portion of the housing 30O that covers the second main surface 11c of the translucent member 11 functions as a reflecting portion that reflects the light that guides the translucent member 11 toward the first main surface 11b. Can be made to. Therefore, as in the second embodiment, the amount of light incident on the light control layer 12 from the translucent member 11 can be increased, so that the light is emitted from the light control layer 12 side to the outside of the light guide body 10. The amount of light extracted can be increased.
  • the translucent member 11 in the housing 30O is the first.
  • the reflective sheet 70 may be separately arranged between the portion covering the main surface 11c of 2 and the translucent member 11. That is, even if the reflective sheet 70 in contact with the second main surface 11c of the translucent member 11 is arranged as the reflecting portion that reflects the light that guides the translucent member 11 toward the first main surface 11b. good. Also in this case, the amount of light emitted from the light control layer 12 side to the outside of the light guide body 10 can be increased.
  • the reflective sheet 70 may be made of white resin, may be a sheet on which a metal film is formed, or may be a metal sheet itself, or may be a prism sheet on which a reflective prism is formed.
  • the first end surface 11a of the translucent member 11 is perpendicular to the first main surface 11b, but the present invention is not limited to this.
  • the translucent member 11Q of the light guide body 10Q may have a shape in which the end portion is cut. Specifically, an inclined portion 11Q1 is formed at an end portion of the translucent member 11Q, and the first end surface 11a is an inclined surface that is inclined with respect to the first main surface 11b.
  • the light source 20 may be arranged so that the optical axis of the light source 20 is perpendicular to the first end surface 11a which is an inclined surface.
  • the first end surface 11a of the translucent member 11 is a flat surface, but the present invention is not limited to this.
  • the recess 11R1 having a tapered surface recessed inward toward the inside of the translucent member 11R on the first end surface 11a of the translucent member 11R of the light guide body 10R. May be formed.
  • the amount of light of the light source 20 incident on the translucent member 11R can be increased. That is, it is possible to improve the incident efficiency of the light of the light source 20 on the translucent member 11R.
  • the amount of light emitted from the light guide body 10R to the outside can be increased, and the light extraction efficiency of the light emitting device 1R can be improved.
  • a colloidal crystal film containing a colloidal crystal is used as the optical control layer 12 having a three-dimensional periodic structure, but the present invention is not limited to this.
  • the optical control layer 12 may have a three-dimensional periodic structure such as a diffraction grating that generates diffracted light that changes its color depending on the viewing angle.
  • the diffraction grating that generates the diffracted light as in the first embodiment requires precise microfabrication, which increases the cost.
  • the colloidal crystal film can be formed only by applying it, it can be produced at low cost even if it has a large area. Therefore, it is better to use a colloidal crystal film containing colloidal crystals as the optical control layer 12.
  • the light emitted from the light source 20 using one light source 20 is incident on the translucent member 11 from the first end surface 11a of the translucent member 11.
  • the light emitted from one light source 20 may be incident on the translucent member 11 from the second end surface 11d of the translucent member 11, or the first main surface 11b of the translucent member 11 may be incident.
  • the light may be incident into the translucent member 11 from the second main surface 11c. Therefore, the light source 20 is not arranged so as to face the first end surface 11a of the translucent member 11, but is the second end surface 11d, the first main surface 11b, or the first translucent member 11. It may be arranged so as to face the main surface 11c of 2.
  • the light source 20 is a white light source having continuous light intensity in a wide wavelength range, but the present invention is not limited to this.
  • the light source 20 may emit light having a single wavelength having a specific peak wavelength or light having a plurality of wavelengths having a specific peak wavelength.
  • the light source 20 may emit light having a single wavelength of red, or may emit white light having three peak wavelengths of red, green, and blue.
  • the color of the light (diffracted light) extracted can be changed according to the viewing angle. That is, the gradation of color change is visually recognized according to the observation angle.
  • the light emitted by the light source 20 is light having a single wavelength
  • the color change does not occur so as to be visible to the user, and the light is extracted only at an angle corresponding to the single wavelength.
  • the light source 20 is configured to emit white light by the blue LED chip and the yellow phosphor, but the present invention is not limited to this.
  • a phosphor-containing resin containing a red phosphor and a green phosphor may be used, and the combination of this with a blue LED chip may be configured to emit white light. good.
  • the light emitting element 21 of the light source 20 uses a blue LED chip that emits blue light, but the present invention is not limited to this.
  • the light emitting element 21 may use an LED chip that emits a color other than blue.
  • the light emitting element 21 may use an LED chip that emits ultraviolet light.
  • the phosphor particles a combination of phosphors of each color that emits light in the three primary colors (red, green, and blue) can be used.
  • a phosphor is used as the wavelength conversion material, a wavelength conversion material other than the phosphor may be used.
  • a material containing a substance such as a semiconductor, a metal complex, an organic dye, or a pigment that absorbs light having a certain wavelength and emits light having a wavelength different from the absorbed light may be used.
  • the light source 20 is an LED module using an LED, but the present invention is not limited to this.
  • the light source 20 may use a solid-state light emitting element other than an LED such as a semiconductor laser or an organic EL (Electro Luminescence), or may be a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL). Any light source 20 may be used as long as it can inject light into the translucent member 11.
  • the light emitting device in the above-described first and second embodiments and the modified example can be used as, for example, a lighting device.
  • the light emitting device as the lighting device, it is possible to realize a lighting system having one or more lighting devices.
  • the color of the illumination light changes depending on the viewing angle of the illumination device, so that it is possible to produce a space.
  • the light emitting device as the optical transmission device, it is possible to realize an optical communication system having one or more optical transmission devices.
  • the light extracted from the light emitting device 1 can be used as light for various purposes other than the illumination light.
  • the light guide body when the light is not emitted from the light source 20 (when the light source is turned off), the light guide body becomes transparent, so that the other side can be seen through. It becomes (transparent) because the optical control layer made of a colloidal crystal film does not reflect (that is, is transparent) other than a specific wavelength.
  • the light guide body when the light is emitted from the light source 20 (when the light source is lit), the light guide body emits light and the light is taken out from the light guide body. Therefore, the light emission of the light guide makes the other side invisible (light-shielding state).
  • the color of a specific wavelength can be seen by the optical control layer made of the colloidal crystal film.
  • the light emitting devices according to the first and second embodiments and the modified examples it is possible to easily switch ON / OFF of the visual information of the transparent state and the light-shielding state by the electric signal.
  • the light emitting device in the first and second embodiments and the modified example can also be used as a partition or the like that can visually block the space.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Optical Filters (AREA)
PCT/JP2021/006693 2020-03-10 2021-02-22 発光装置、照明システム及び光通信システム Ceased WO2021182096A1 (ja)

Priority Applications (4)

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US17/802,567 US12018834B2 (en) 2020-03-10 2021-02-22 Light-emitting device, lighting system, and optical communication system
JP2022505896A JP7417879B2 (ja) 2020-03-10 2021-02-22 発光装置、照明システム及び光通信システム
EP21767617.0A EP4119842A4 (en) 2020-03-10 2021-02-22 LIGHT EMITTING DEVICE, LIGHTING SYSTEM AND OPTICAL COMMUNICATIONS SYSTEM
CN202180017180.2A CN115210498B (zh) 2020-03-10 2021-02-22 发光装置、照明系统以及光通信系统

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CN115210498B (zh) 2025-11-18
JPWO2021182096A1 (https=) 2021-09-16
JP7417879B2 (ja) 2024-01-19
EP4119842A4 (en) 2023-09-06
EP4119842A1 (en) 2023-01-18
US20230080967A1 (en) 2023-03-16
US12018834B2 (en) 2024-06-25

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