WO2021187207A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

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Publication number
WO2021187207A1
WO2021187207A1 PCT/JP2021/009092 JP2021009092W WO2021187207A1 WO 2021187207 A1 WO2021187207 A1 WO 2021187207A1 JP 2021009092 W JP2021009092 W JP 2021009092W WO 2021187207 A1 WO2021187207 A1 WO 2021187207A1
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Prior art keywords
light
wavelength conversion
lighting device
conversion layer
region
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PCT/JP2021/009092
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English (en)
Japanese (ja)
Inventor
佑樹 前田
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ソニーグループ株式会社
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Publication of WO2021187207A1 publication Critical patent/WO2021187207A1/fr

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    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/15—Thermal insulation
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/54—Cooling arrangements using thermoelectric means, e.g. Peltier 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
    • 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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • 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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/38—Combination of two or more photoluminescent elements of different materials

Definitions

  • the present disclosure relates to, for example, a lighting device using a phosphor or quantum dots as a light emitting material.
  • Patent Document 1 discloses a color-adjustable lighting assembly including a light emitting element, a luminescence layer, and a temperature control means.
  • the illumination device of the embodiment of the present disclosure is arranged on the light source unit, the temperature adjusting unit having one surface, and one surface side of the temperature adjusting unit, and absorbs the light emitted from the light source unit as excitation light.
  • the light emitted from the light source unit and the light of the first wavelength are arranged between the first wavelength conversion layer that emits the light of the first wavelength band and the first wavelength conversion layer of the temperature adjusting unit. It absorbs at least one of the above as excitation light, emits light in a second wavelength band different from that in the first wavelength band, and has a second temperature sensitivity higher than that of the first wavelength conversion layer. It is provided with a wavelength conversion layer of.
  • the temperature of the second wavelength conversion layer having higher temperature sensitivity is adjusted among the first wavelength conversion layer and the second wavelength conversion layer having different temperature sensitivities and emission wavelengths from each other. By providing it on the part side, the wavelength of the output light is actively changed.
  • Third embodiment (example in which the temperature control unit and the internal space are further divided into a plurality of regions) 4.
  • Fourth embodiment (example in which a temperature control region and a constant temperature region are provided in the temperature control unit) 5.
  • Fifth Embodiment (Other Examples of Optical Systems) 6.
  • Sixth Embodiment (Other Examples of Optical Systems) 7.
  • Seventh Embodiment (an example of an optical system constituting natural light illumination) 8.
  • Eighth Embodiment (Other Examples of Optical Systems Constituting Natural Light Illumination) 9.
  • Ninth Embodiment (Example of an optical system constituting blue separation illumination) 10.
  • Tenth Embodiment (An example of a transmission type wavelength conversion element) 11.
  • Eleventh embodiment (another example of a transmission type wavelength conversion element) 12.
  • 12th Embodiment (Example of color adjustment system)
  • FIG. 1 schematically shows an example of a cross-sectional configuration of a wavelength conversion element 10 constituting a lighting device (see lighting devices 1 and 3) according to the first embodiment of the present disclosure.
  • FIG. 2 schematically shows an example of the planar configuration of the wavelength conversion element 10 shown in FIG. 1, and FIG. 1 shows a cross section taken along line II shown in FIG.
  • the wavelength conversion element 10 is used as a light source of the lighting device 1 described later.
  • the wavelength conversion element 10 has a temperature adjusting unit 11, a quantum dot layer 12, and a phosphor layer 13, and the quantum dot layer 12 and the phosphor layer 13 are laminated in this order from the temperature adjusting unit 11 side. ing.
  • the temperature adjusting unit 11 corresponds to a specific example of the "temperature adjusting unit” of the present disclosure.
  • the quantum dot layer 12 corresponds to a specific example of the "second wavelength conversion layer” of the present disclosure
  • the phosphor layer 13 corresponds to a specific example of the "first wavelength conversion layer” of the present disclosure.
  • the wavelength conversion element 10 further includes a light distribution control structure 14 having a parabolic surface (surface 14S1) on the upper surface (surface 11S1) of the temperature adjusting unit 11, for example, with respect to the upper surface (surface 11S1) of the temperature adjusting unit 11.
  • a light distribution control structure 14 having a parabolic surface (surface 14S1) on the upper surface (surface 11S1) of the temperature adjusting unit 11, for example, with respect to the upper surface (surface 11S1) of the temperature adjusting unit 11.
  • the lower surface (surface 14S2) of the light distribution control structure 14 facing the upper surface (surface 11S1) of the temperature adjusting unit 11 is partially open, and the upper surface (surface 11S1) of the temperature adjusting unit 11 is exposed.
  • a reflective film 15 is formed on the upper surface (surface 11S1) of the exposed temperature adjusting unit 11 and the paraboloid surface (surface 14S1) of the light distribution control structure 14, and the quantum dot layer 12 and the phosphor layer 13 are formed.
  • the light distribution control structure 14 corresponds to a specific example of the "light distribution control structure" of the present disclosure
  • a parabolic surface (surface 14S1) corresponds to a specific example of the "light distribution control surface” of the present disclosure. ..
  • the wavelength conversion element 10 further has a dichroic mirror 16 above the upper surface (surface 11S1) of the temperature adjusting unit 11.
  • the dichroic mirror 16 is connected to, for example, the peripheral edge of the light distribution control structure 14, and the upper surface (surface 16S1) of the dichroic mirror 16 is an entrance / exit surface of the excitation light EL and the respective color lights Lr, Ly, Lg, and Lb. (Surface S1). That is, the wavelength conversion element 10 has, for example, a closed internal space A composed of a temperature adjusting unit 11, a light distribution control structure 14, and a dichroic mirror 16, and the quantum dot layer 12 and the phosphor layer 13 are formed. , It is formed in this internal space A.
  • the dichroic mirror 16 corresponds to a specific example of the "color separation unit" of the present disclosure.
  • the wavelength conversion element 10 further has a heat insulating portion 17 that further divides the internal space A and the temperature adjusting portion 11 into a plurality of (for example, two) regions (first region A and second region B).
  • a heat insulating portion 17 that further divides the internal space A and the temperature adjusting portion 11 into a plurality of (for example, two) regions (first region A and second region B).
  • the temperature adjusting unit 11 is for adjusting the temperature of the quantum dot layer 12, and has, for example, a plate-like shape having an upper surface (surface 11S1) and a lower surface (surface 11S2).
  • a Perche element or a heater can be used as the temperature adjusting unit 11, for example, a Perche element or a heater.
  • the quantum dot layer 12 is formed, for example, by including a plurality of quantum dots as a light emitting material, and is excited by an excitation light EL or light emitted from a phosphor layer 13 described later (for example, yellow light Ly). Therefore, it emits light in a wavelength band different from the wavelength band of the excitation light EL.
  • the quantum dot layer 12 can be formed, for example, by dispersing a plurality of quantum dots in a resin binder or an inorganic glass binder having light transmittance.
  • the quantum dot layer 12 for example, ceramics obtained by firing a plurality of quantum dots can be used.
  • Quantum dots are generally semiconductor nanoparticles having a particle size of several nm.
  • the quantum dot layer 12 can be formed by including one type or two or more types of quantum dots made of the above materials. For example, by mixing and using a plurality of types of quantum dots having a narrow wavelength width, it is possible to obtain a broad wavelength from the quantum dot layer 12.
  • the film thickness of the quantum dot layer 12 is, for example, 100 nm or more and 300 ⁇ m or less.
  • the internal space A and the temperature adjusting unit 11 are divided into two regions, a first region A and a second region B.
  • the quantum dot layer 12A and the quantum dot layer 12B provided in the first region A and the second region B, respectively, are formed so as to emit light having wavelength bands different from each other, for example.
  • the quantum dot layer 12A is excited by, for example, blue light (excitation light EL) emitted from the light source unit 21 (see FIG. 3), and emits light (red light Lr) in a wavelength band corresponding to, for example, red.
  • it is formed by including a plurality of types of quantum dots.
  • the quantum dot layer 12B is excited by, for example, blue light (excitation light EL) emitted from the light source unit 21, and emits light (green light Lg) in a wavelength band corresponding to, for example, green. It is formed including dots.
  • excitation light EL excitation light
  • green light Lg green light Lg
  • red light Lr and green light Lg correspond to a specific example of "light in the second wavelength band" of the present disclosure.
  • the light emitting material forming the quantum dot layer 12 may have a higher temperature sensitivity than the phosphor particles constituting the phosphor layer 13 described later, in other words, a material having a high temperature dependence, and other than the quantum dots.
  • an organic dye or an inorganic phosphor can be used as a light emitting material.
  • the phosphor layer 13 contains, for example, a plurality of phosphor particles as a light emitting material, and is excited by the excitation light EL to emit light in a wavelength band different from the wavelength band of the excitation light EL.
  • a so-called ceramic phosphor can be used.
  • the phosphor layer 13 can be formed, for example, by dispersing a plurality of phosphor particles in a light-transmitting resin binder or an inorganic glass binder, similarly to the quantum dot layer 12.
  • the phosphor particles include Ce: YAG (yttrium aluminum garnet) -based material, Ce: LuAG-based material, Eu: SCASN-based material, and Eu: SiAlON-based material. Similar to the quantum dot layer 12, the phosphor layer 13 can be formed by containing one or more types of phosphor particles made of the above materials. The film thickness of the phosphor layer 13 is, for example, 10 ⁇ m or more and 300 ⁇ m or less.
  • the phosphor layer 13 is provided in the first region A and the second region B, respectively, like the quantum dot layer 12.
  • the phosphor layer 13A and the phosphor layer 13 provided in the first region A and the second region B, respectively, are formed so as to emit light having the same wavelength band as each other, for example.
  • the phosphor layer 13A and the phosphor layer 13B are each excited by, for example, blue light (excitation light EL) emitted from the light source unit 21, and for example, light in a wavelength band corresponding to yellow (yellow light Ly). It is formed to contain phosphor particles that emit light. This yellow light corresponds to a specific example of "light in the first wavelength band" of the present disclosure.
  • the phosphor layer 13A and the phosphor layer 13 provided in the first region A and the second region B, respectively, may be formed so as to emit light having different wavelength bands from each other. Further, as long as the phosphor layer 13 has a structure having a lower temperature sensitivity than the quantum dot layer 12, the light emitting material constituting the phosphor layer 13 is not necessarily limited to the phosphor particles. In other words, the light emitting material constituting the phosphor layer 13 may have a lower temperature dependence than the light emitting material forming the quantum dot layer 12. That is, the phosphor layer 13 may use, for example, an organic dye or quantum dots in addition to the phosphor particles, depending on the combination with the light emitting material constituting the quantum dot layer 12.
  • the light distribution control structure 14 transmits light (each color light Lr, Lg, Ly) emitted from the quantum dot layer 12 and the phosphor layer 13 and the quantum dot layer 12 and the phosphor layer 13 and is used as blue light Lb, for example. This is for controlling the light distribution direction of some of the excitation light ELs to improve the light extraction efficiency.
  • the light distribution control structure 14 is arranged, for example, on the upper surface (surface 11S1) of the temperature adjusting unit 11. As described above, the light distribution control structure 14 has a parabolic surface (surface 14S1) with respect to the upper surface (surface 11S1) of the temperature adjusting unit 11, and is also on the bottom of the parabolic surface (surface 14S1). It has an opening 14H.
  • the quantum dot layer 12 and the phosphor layer 13 are formed along the parabolic surface (plane 14S1) of the light distribution control structure 14 and the upper surface (plane 11S1) of the temperature adjusting unit 11 exposed in the opening 14H. That is, the temperature of a part of the quantum dot layer 12 is controlled via the light distribution control structure 14. As a result, the light distribution directions of the colored lights Lr, Lg, Ly and a part of the excitation light EL (hereinafter, simply referred to as blue light Lb) emitted from the quantum dot layer 12 and the phosphor layer 13 are controlled, and the quantum is also controlled.
  • the film formation area of the dot layer 12 is expanded, and the temperature of the quantum dot layer 12 can be effectively controlled.
  • the light distribution control structure 14 is preferably formed using a material having excellent thermal conductivity. Examples of such a material include copper (Cu), aluminum (Al), molybdenum (Mo), and alloys containing any of the above.
  • the light distribution control structure 14 can be formed of, for example, ceramics using aluminum nitride (AlN) or silicon carbide (SiC).
  • the parabolic surface (surface 14S1) of the light distribution control structure 14 may be a linear inclined surface in addition to the curved surface as shown in FIG. Further, the paraboloid surface (surface 14S1) may be, for example, a rough surface. As a result, the contact area between the quantum dots constituting the quantum dot layer 12 and the paraboloid surface (plane 14S1) becomes large, and the temperature of the quantum dot layer 12 can be controlled more effectively.
  • the reflective film 15 is for efficiently reflecting each color light Lr, Lg, Ly and blue light Lb emitted from the quantum dot layer 12 and the phosphor layer 13 on the parabolic surface (plane 14S1) of the light distribution control structure 14. It is a thing.
  • the reflective film 15 is formed so as to extend over, for example, the parabolic surface (surface 14S1) of the light distribution control structure 14 and the upper surface (surface 11S1) of the temperature adjusting unit 11 exposed in the opening 14H of the light distribution control structure 14. .
  • As the reflective film 15, for example, a silver brightening film, an aluminum brightening film, a dielectric multilayer film, or a barium sulfate mixed film can be used.
  • the polyreflecting film is a metal film on which a dielectric film is laminated.
  • the reflective film 15 can be omitted when the upper surface (surface 11S1) of the temperature adjusting unit 11 and the parabolic surface (surface 14S1) of the light distribution control structure have sufficient light reflectivity.
  • the dichroic mirror 16 selectively reflects a part or all of the light in a predetermined wavelength band and transmits the light in the other wavelength band. In the present embodiment, for example, one of the excitation light ELs. Those that reflect the part as blue light Lb are used.
  • the dichroic mirror 16 has a function as a mirror by using a light-transmitting member such as glass or a sapphire substrate as a base material and forming a dielectric multilayer film on one surface of the base material, for example. It is a sapphire. As described above, the dichroic mirror 16 is connected to, for example, a flat peripheral edge of the light distribution control structure 14, so that the internal space A is sealed on the parabolic surface (surface 14S1) side of the light distribution control structure 14.
  • the quantum dot layer 12 and the phosphor layer 13 are hermetically sealed in the internal space A by the dichroic mirror 16. Thereby, the reliability of the light emitting material (for example, quantum dots and phosphor particles) contained in the quantum dot layer 12 and the phosphor layer 13 can be improved.
  • the light emitting material for example, quantum dots and phosphor particles
  • the dichroic mirror 16 and the light distribution control structure 14 may be physically connected by using an adhesive, or may be mechanically connected by packing or the like.
  • the dichroic mirror 16 includes a part of the excitation light EL incident on the upper surface (surface 16S1) and the colored lights Lr, Lg, emitted from the quantum dot layer 12 and the phosphor layer 13 incident on the lower surface (surface 16S2).
  • the portion through which Ly and the blue light Lb are transmitted may be formed by other members.
  • the portion around the light transmitting portion, for example, connected to the light distribution control structure 14, may be formed by the same member as the light distribution control structure 14.
  • the heat insulating portion 17 is for suppressing heat transfer between the first region A and the second region B. Specifically, the heat insulating portion 17 penetrates between the first region A and the second region B, between the upper surface (surface 11S1) and the lower surface (surface 11S2) of the temperature adjusting unit 11, and at the same time.
  • the internal space A is divided into a space A1 and a space A2, and is formed so as to penetrate between the upper surface (surface 16S1) and the lower surface (surface 16S2) of the dichroic mirror 16.
  • the heat insulating portion 17 is preferably formed by using a material having low thermal conductivity and light transmittance so that color mixing occurs between the first region A and the second region B.
  • a glass substrate or a sapphire substrate, or a transparent plate to which a light diffusion function is added can be used.
  • the heat insulating portion 17 may be formed of, for example, an air layer.
  • the excitation light EL emitted from the light source unit 21 first enters the dichroic mirror 16. A part of the excitation light EL incident on the dichroic mirror 16 is reflected and used as blue light Lb, and the rest is transmitted through the dichroic mirror 16 and incident on the phosphor layers 13 (13A, 13B). Part or all of the excitation light EL incident on the phosphor layer 13 (13A, 13B) is absorbed by the phosphor layer 13 (13A, 13B) to excite the phosphor particles. As a result, the phosphor layer 13 (13A, 13B) emits yellow light Ly. At this time, the phosphor layer 13A and the phosphor layer 13B are excited at the same time, and the ratio of the excitation light amount can be adjusted by the excitation light intensity distribution and the excitation position with respect to the desired emission spectrum.
  • the excitation light EL that was not absorbed by the phosphor layer 13 (13A, 13B) passes through the phosphor layer 13 (13A, 13B) and is incident on the quantum dot layer 12 (12A, 12B). Part or all of the excitation light EL incident on the quantum dot layer 12 (12A, 12B) is absorbed by the quantum dot layer 12 (12A, 12B) to excite the quantum dots. Further, the yellow light Ly emitted from the phosphor layer 13 (13A, 13B) to the quantum dot layer 12 (12A, 12B) side is absorbed by the quantum dot layer 12 (12A, 12B) to excite the quantum dots. That is, a part of the yellow light Ly is used as the excitation light of the quantum dots.
  • the quantum dot layer 12A emits red light Lr
  • the quantum dot layer 12B emits green light Lg.
  • the amounts of red light Lr and green light Lg emitted from the quantum dot layer 12A and the quantum dot layer 12B can be adjusted.
  • the red light Lr and green light Lg emitted to the temperature control unit 11 side by the quantum dot layer 12 (12A, 12B) and the yellow light Ly not absorbed by the quantum dot layer 12 (12A, 12B) are reflected, for example, respectively. Together with the yellow light Ly, the red light Lr, and the green light Lg that are reflected by the film 15 and emitted to the dichroic mirror 16 side, they pass through the dichroic mirror 16 and are emitted toward the optical system 20 described later.
  • the excitation light EL that was not absorbed by the quantum dot layer 12 (12A, 12B) is reflected by, for example, the reflective film 15, and is absorbed again by the quantum dot layer 12 (12A, 12B) and the phosphor layer 13 (13A, 13B). At the same time, it passes through the dichroic mirror 16 and is taken out from the wavelength conversion element 10.
  • the extracted excitation light EL is emitted as blue light Lb together with the excitation light EL reflected by the dichroic mirror 16 toward the optical system 20 described later together with the yellow light Ly, the red light Lr, and the green light Lg.
  • FIG. 3 shows, for example, an example of the configuration of the optical system of the lighting device 1 capable of uniform illumination.
  • the lighting device 1 includes a wavelength conversion element 10, an optical system 20, and an illumination optical system 30.
  • the optical system 20 dims the blue laser LB (blue light Lb) emitted from the light source unit 21, the red light Lr, the yellow light Ly, and the green light Lg emitted from the wavelength conversion element 10, for example. It has a lens 22, a retardation plate 23, and a polarized dichroic mirror 24.
  • each member constituting the optical system 20 the lens 22, the retardation plate 23, and the polarizing dichroic mirror 24 are emitted from the wavelength conversion element 10 in this order from the wavelength conversion element 10 side (each color light Lr, Ly, Lg). , Lb) are arranged on the optical path.
  • the light source unit 21 is arranged at a position orthogonal to the optical path of the light emitted from the wavelength conversion element 10 and facing one light incident surface of the polarized dichroic mirror 24.
  • the illumination optical system 30 has, for example, a fly-eye lens 31.
  • the light source unit 21 has a light emitting element that emits light having a predetermined wavelength.
  • a semiconductor laser (LD) that oscillates blue light having a wavelength of 445 nm or 455 nm is used, and for example, a linearly polarized (S-polarized) blue laser LB is emitted from the light source unit 21.
  • LD semiconductor laser
  • the light source unit 21 is composed of a semiconductor laser
  • one semiconductor laser may be used to obtain an excitation light EL having a predetermined output, but the emitted light from a plurality of semiconductor lasers may be combined to obtain a predetermined output.
  • the configuration may be such that the excitation light EL of the output is obtained.
  • the wavelength band of the excitation light EL is not limited to the above numerical value, and any wavelength can be used as long as it is within the wavelength band of light called blue light.
  • the lens 22 converts the light (each color light Lr, Ly, Lg, Lb) emitted from the wavelength conversion element 10 into parallel light, and emits the parallel light toward the retardation plate 23. Further, the lens 22 focuses the blue laser LB emitted from the retardation plate 23 to a predetermined spot diameter, and emits the condensed blue laser LB toward the wavelength conversion element 10.
  • the lens 22 may be composed of, for example, one collimated lens, or may be configured to convert incident light into parallel light by using a plurality of lenses.
  • the phase difference plate 23 is for adjusting the balance of the blue laser LB emitted from the light source unit 21 as the excitation light EL and the blue light Lb.
  • the retardation plate 23 is ⁇ / 4 (90) with respect to the incident light. It is formed by using a ⁇ / 4 wave plate that emits light with a phase difference of °).
  • the ⁇ / 4 wave plate converts linearly polarized light into circularly polarized light when the incident light is linearly polarized light, and converts circularly polarized light into linearly polarized light when the incident light is circularly polarized light.
  • the retardation plate 23 converts the linearly polarized excitation light EL emitted from the polarized dichroic mirror 24 into circularly polarized light, and the circularly polarized excitation light included in the light emitted from the wavelength conversion element 10.
  • the component blue light Lb is converted into linearly polarized light.
  • the polarized dichroic mirror 24 separates the incident light based on the wavelength band and the polarized light component. Specifically, the blue laser LB incident from the light source unit 21 is reflected and guided to the wavelength conversion element 10, and among the colored lights Lr, Ly, Lg, and Lb incident from the wavelength conversion element 10, for example, the S polarization component. Is configured to reflect and transmit the P-polarized light component. As a result, the polarized dichroic mirror 24 emits red light Lr, yellow light Ly, green light Lg, and blue light Lb having a uniform polarization component toward the fly-eye lens 31.
  • the fly-eye lens 31 homogenizes the red light Lr, the yellow light Ly, the green light Lg, and the blue light Lb emitted from the polarized dichroic mirror 24 to homogenize the illuminance distribution of the illumination light emitted from the illumination device 1. It is intended.
  • the red light Lr, yellow light Ly, green light Lg, and blue light Lb emitted from the polarized dichroic mirror 24 are divided into a plurality of light beams by the microlens of the first fly-eye lens 31A, and then the second fly-eye. An image is formed on each of the corresponding microlenses of the lens 31B.
  • Each of the microlenses of the second fly-eye lens 31B functions as a secondary light source. As a result, a plurality of parallel lights having the same brightness are emitted from the illuminating device 1.
  • the lighting device 1 of the present embodiment includes a temperature adjusting unit 11, a first wavelength conversion layer (phosphor layer 13) and a second wavelength conversion layer (quantum dot layer 12) having different temperature sensitivities and emission wavelengths from each other.
  • the quantum dot layer 12 having a higher temperature sensitivity and the phosphor layer 13 having a lower temperature sensitivity than the quantum dot layer 12 were laminated in this order from the temperature adjusting unit 11 side. This makes it possible to actively change the wavelength of the output light. This will be described below.
  • LEDs light emitting diodes
  • a lighting device capable of increasing brightness and adjusting color can be realized by arranging a plurality of LEDs, but the reflection optical system is used to make the illumination light uniform, and the pseudo-sunlight illumination makes it infinite. It becomes large because it performs. Further, since high-precision reflection is required, the number of parts tends to increase and the weight tends to increase.
  • the light emitting portion can be made smaller, so that the optical system can be made smaller.
  • adjustment of color has been an issue.
  • FIG. 4 shows the temperature sensitivity of the phosphor particles and the quantum dots. From FIG. 4, the relative brightness maintenance rate with respect to the temperature of the phosphor particles is almost constant regardless of the temperature, whereas the relative brightness maintenance rate of the quantum dots decreases by about 20% when the temperature rises by, for example, about 50 ° C. You can see that it does. As described above, by providing the quantum dot layer 12 on the temperature adjusting unit 11 side using the quantum dots having high temperature dependence, it is possible to actively change the wavelength of the output light. In addition, when used in combination with the phosphor layer 13, a broad emission spectrum can be obtained.
  • the lighting device 1 of the present embodiment can provide a lighting device capable of efficiently performing color adjustment.
  • the lighting device 1 of the present embodiment it is possible to reduce the size and weight of the entire lighting device as compared with the lighting device using the LED. Further, in the lighting device 1 of the present embodiment, it is possible to realize higher brightness as compared with the lighting device using the LED. Furthermore, in the lighting device 1 of the present embodiment, the wavelength conversion element 10 constituting the light source unit has a smaller light emission size than the case where the LED is used as the light source, so that the coupling efficiency with the waveguide optical system is improved. It becomes possible to make it. Therefore, it is possible to provide a smaller and higher-luminance lighting device.
  • the temperature control unit 11 is used to control the temperature of the quantum dot layer 12, it is possible to realize a wavelength conversion element capable of performing color adjustment without rotation. Become. This makes it possible to reduce the size and weight of the illuminating device 1 as compared with the case where a so-called phosphor wheel, which is a rotary wavelength conversion element, is used.
  • the quantum dots included in the quantum dot layer 12 are less likely to be directly excited by the excitation light EL. Therefore, the quantum dots are less likely to deteriorate, and the reliability can be improved.
  • a structure has been proposed in which the temperature of the luminescence layer is adjusted by using a temperature control means such as a Perche element.
  • the quantum dots have a particle size of several nm, so that the scattering effect on the emitted light is small and the quantum dots cannot be taken out from the luminescence layer.
  • the light distribution control has a parabolic surface (surface 14S1) on the upper surface (surface 11S1) of the temperature adjusting unit 11 with respect to the upper surface (surface 11S1) of the temperature adjusting unit 11, for example.
  • the structure 14 was arranged so that the quantum dot layer 12 was formed along the paraboloid (plane 14S1). As a result, the light (red light Lr, green light Lg) emitted from the quantum dot layer 12 can be effectively taken out of the layer. Therefore, it is possible to improve the efficiency of light utilization.
  • the quantum dot layer 12 is formed along the radial surface (surface 14S1), the quantum dots are formed on a flat surface such as the upper surface (surface 11S1) of the temperature adjusting unit 11, for example.
  • the film formation area of the quantum dot layer 12 is increased, and the temperature control of the quantum dot layer 12 can be performed more efficiently. This makes it possible to change the wavelength of the output light more actively.
  • FIG. 5 schematically shows an example of the cross-sectional configuration of the wavelength conversion element 10A according to the second embodiment of the present disclosure.
  • the wavelength conversion element 10A is used, for example, as a light source of the above-mentioned lighting device 1 in the same manner as the wavelength conversion element 10 of the first embodiment.
  • the wavelength conversion element 10A of the present embodiment is different from the first embodiment in that a heat insulating portion 18 is provided between the quantum dot layer 12 and the phosphor layer 13.
  • the wavelength conversion element 10A includes a temperature adjusting unit 11, a quantum dot layer 12, a phosphor layer 13, a light distribution control structure 14, a reflecting film 15, a dichroic mirror 16, and heat insulating units 17 and 18. ing.
  • the quantum dot layer 12 is formed on the light emitting surface (surface 14S1) of the light distribution control structure 14 and the upper surface of the temperature adjusting unit 11 exposed in the opening 14H of the light distribution control structure 14 via the reflective film 15. It is formed along (surface 11S1).
  • the phosphor layer 13 is formed along the lower surface (surface 16S2) of the dichroic mirror 16, and a heat insulating portion 18 is provided between the quantum dot layer 12 and the phosphor layer 13.
  • the heat insulating portion 18 is for suppressing heat transfer between the quantum dot layer 12 and the phosphor layer 13. Like the heat insulating portion 17, the heat insulating portion 18 is formed by using a material having low thermal conductivity and having light transmittance so that color mixing occurs between the quantum dot layer 12 and the phosphor layer 13. Is preferable. As the heat insulating portion 18, for example, a glass substrate or a sapphire substrate, or a transparent plate to which a light diffusion function is added can also be used. In addition, the heat insulating portion 18 may be formed of, for example, an air layer.
  • the heat insulating portion 18 is provided between the quantum dot layer 12 and the phosphor layer 13, the quantum dot layer 12 and the phosphor layer 13 are combined. Heat transfer between them, for example, heat inflow from the phosphor layer 13 to the quantum dot layer 12 is reduced. Therefore, the temperature of the quantum dot layer 12 can be adjusted more smoothly, and it is possible to provide a lighting device capable of performing color adjustment more efficiently.
  • FIG. 6A schematically shows an example of the planar configuration of the wavelength conversion element 10B according to the third embodiment of the present disclosure.
  • FIG. 6B schematically shows another example of the planar configuration of the wavelength conversion element 10B according to the third embodiment of the present disclosure.
  • the internal space A and the temperature adjusting unit 11 are divided into two regions (first region A and second region B) by using the heat insulating portion 17, for example.
  • first region A, second region B, third region C, fourth region D Four as shown in FIG. 6A (first region A, second region B, third region C, fourth region D) or eight as shown in FIG. 6B (first region A, second region).
  • B, the third region C, the fourth region D, the fifth region E, the sixth region F, the seventh region G, and the eighth region H) may be divided.
  • the temperature of the quantum dot layer 12 may be adjusted by individually controlling each temperature adjusting unit 11 in the first region A to the eighth region H.
  • the first region A and the second region B, the third region C and the fourth region D, the fifth region E and the sixth region F, the seventh region G and the eighth region H, etc. are grouped by two regions.
  • the temperature of the quantum dot layer 12 may be adjusted by controlling the temperature adjusting unit 11 in each region.
  • Quantum dot layer 12A in each region (for example, 1st region A, 2nd region B, 3rd region C, 4th region D, 5th region E, 6th region F, 7th region G, 8th region H) , 12B, 12C, 12D, 12E, 12F, 12H are formed so as to emit light having wavelength bands different from each other, for example, in part or in whole.
  • Fluorescent layer 13A of each region (for example, 1st region A, 2nd region B, 3rd region C, 4th region D, 5th region E, 6th region F, 7th region G, 8th region H) , 13B, 13C, 13D, 13E, 13F, 13H are formed so as to emit light having the same wavelength band as each other, for example.
  • the phosphor layers 13A, 13B, 13C, 13D, 13E, 13F, 13H in each region are partially or completely different from each other, similarly to the quantum dot layers 12A, 12B, 12C, 12D, 12E, 12F, 12H. It may be formed so as to emit light in a wavelength band.
  • the number of divisions of the internal space A and the temperature adjusting unit 11 divided by the heat insulating unit 17 is increased.
  • it has the effect of enabling finer color adjustment.
  • the quantum dot layer 12 and the phosphor layer 13 are formed.
  • the deterioration rate of the light emitting material is different, it is possible to reduce an unintended change in the light emission spectrum by adjusting the light emission balance in each region.
  • FIG. 7 schematically shows an example of the planar configuration of the wavelength conversion element 10C according to the fourth embodiment of the present disclosure. Similar to the wavelength conversion element 10B shown in FIG. 6A, the wavelength conversion element 10C has the internal space A and the temperature adjusting unit 11 in four regions (first region A, second region B, first region A, second region B, first) using the heat insulating portion 17. The temperature of the first region A and the second region B, which are divided into three regions C and the fourth region D) and arranged in parallel in the X-axis direction, is the same as in the first embodiment and the like. The temperature control region X that can be adjusted is defined, and the third region C and the fourth region D are defined as a constant temperature region Y that is used in a constant temperature state.
  • the constant temperature region Y is for keeping the temperature of the quantum dot layer 12 placed above the temperature adjusting unit 11 constant by using, for example, latent heat cooling.
  • the constant temperature region Y can be formed, for example, by arranging an integrated heat spreader such as a vapor chamber in place of the Perche element or heater constituting the temperature adjusting unit 11.
  • a part of the plurality of regions is set as a constant temperature region for keeping the temperature of the quantum dot layer 12 constant.
  • two regions are temperature control regions X and the remaining two regions are constant temperature regions. I made it Y.
  • the temperature control region X it is possible to obtain a stable light output from the constant temperature region Y while changing the wavelength of the output light more actively, as in the first embodiment. .. Therefore, in addition to the effect of the above-described embodiment, it is possible to suppress power consumption while stably extracting light having a desired wavelength.
  • FIG. 8 shows an example of the configuration of the optical system of the lighting device 1A according to the fifth embodiment of the present disclosure.
  • the illumination device 1A of the present embodiment is different from the first embodiment in that the fly-eye lens 31 constituting the illumination optical system 30 is a diffuser plate 32.
  • the red light Lr, the yellow light Ly, the green light Lg, and the blue light Lb emitted from the polarized dichroic mirror 24 can be homogenized by the diffuser 32 as well.
  • fly-eye lens 31 composed of a pair of fly-eye lens pairs (first fly-eye lens 31A and second fly-eye lens 31B) is shown.
  • the same effect can be obtained by using a double-sided fly-eye lens.
  • the same effect as when the fly-eye lens 31 or the diffusion plate 32 is provided can be obtained, and the number of parts can be further reduced. It will be possible.
  • FIG. 9 shows an example of the configuration of the optical system 40 of the lighting device 1B according to the sixth embodiment of the present disclosure.
  • the balance used as the excitation light EL and the blue light Lb of the blue laser LB emitted from the light source unit 21 is arranged between the lens 22 and the polarized dichroic mirror 24.
  • An example of adjusting in No. 23 is shown, but the adjustment is not limited to this.
  • the retardation plate 41 is arranged between the light source unit 21 and the polarized dichroic mirror 24, and the excitation light of the blue laser LB emitted from the light source unit 21 before being incident on the polarized dichroic mirror 24 is provided. It differs from the first embodiment in that the balance used as EL and blue light Lb is adjusted.
  • the optical system 40 includes a lens 22, a polarized dichroic mirror 24, retardation plates 41 and 42, and a reflection mirror 43.
  • Each member constituting the optical system 40 is of light (each color light Lr, Ly, Lg, Lb) emitted from the wavelength conversion element 10 side in this order by the lens 22 and the polarizing dichroic mirror 24 from the wavelength conversion element 10 side. It is located on the optical path.
  • the light source unit 21 is arranged in a direction orthogonal to the optical path of the light emitted from the wavelength conversion element 10 and at a position facing one light incident surface of the polarized dichroic mirror 24, and is polarized with the light source unit 21.
  • a retardation plate 41 is arranged between the dichroic mirror 24 and the dichroic mirror 24.
  • the retardation plate 42 and the reflection mirror 43 are arranged in this order at positions of the polarized dichroic mirror 24 facing the incident surface opposite to the incident surface facing the light source unit 21.
  • the retardation plate 41 is, for example, a ⁇ / 2 wavelength plate, and emits light with a phase difference of ⁇ / 2 (180 °) with respect to the incident light.
  • the retardation plate 41 of the present embodiment is for adjusting the balance of the blue laser LB emitted from the light source unit 21 as the excitation light EL and the blue light Lb.
  • the retardation plate 42 is, for example, a ⁇ / 4 wavelength plate, and emits light with a phase difference of ⁇ / 4 (90 °) with respect to the incident light.
  • the reflection mirror 43 reflects the blue light Lb transmitted through the retardation plate 42 toward the retardation plate 42 again.
  • the lens 22, the polarized dichroic mirror 24, the retardation plates 41 and 42, and the reflection mirror 43 are used, and the retardation plate 41 emits light from the light source unit 21.
  • the balance of the excited light EL and the blue light Lb constituting the illumination light is adjusted, and the blue laser LB (blue light Lb) transmitted through the polarized dichroic mirror 24 is transmitted by the retardation plate 42 and the reflection mirror 43.
  • the light was made to enter the polarized dichroic mirror 24 again.
  • the lighting device 1B of the present embodiment it is possible to form a small and highly efficient white light source as in the first embodiment.
  • FIG. 10 shows an example of the configuration of the lighting device 2 according to the seventh embodiment of the present disclosure.
  • the illuminating device 2 of the present embodiment is used, for example, as natural light illumination, and a reflection mirror 51 and a light diffusing window are attached to the tip of the fly-eye lens 31 of the illuminating device 1 described in the first embodiment. 52 are arranged in this order.
  • the reflection mirror 51 is for reflecting the homogenized light L emitted from the fly-eye lens 31 toward the light diffusion window 52.
  • the number of reflection mirrors 51 is not limited to one, and two or more reflection mirrors 51 may be used. Further, by using a concave mirror as the reflection mirror 51, the optical distance can be shortened.
  • the light diffusion window 52 reproduces a deep blue sky.
  • the light diffusion window 52 is formed by using, for example, an acrylic plate containing nanoparticles such as titanium oxide (TiO 2 ), and the light L incident on the light diffusion window 52 is Rayleigh scattered by the nanoparticles and used as pseudo-natural light. It is emitted.
  • the reflection mirror 51 and the light diffusion window 52 are arranged at the tip of the fly-eye lens 31 of the lighting device 1 described in the first embodiment. Therefore, it is possible to reproduce a deep blue sky. Therefore, it is possible to reduce the size and weight as compared with the lighting device that illuminates the pseudo-sunlight using the above-mentioned LED.
  • the lighting device 2 of the present embodiment for example, it is possible to reproduce a change in the color of the sky with the passage of time.
  • FIG. 11 shows an example of the configuration of the lighting device 3 according to the eighth embodiment of the present disclosure.
  • the lighting device 3 of the present embodiment is used, for example, as natural light lighting, like the lighting device 2 of the seventh embodiment.
  • the lens 53 and the light diffusion window 54 are arranged in this order at the tip of the fly-eye lens 31 of the lighting device 1 described in the first embodiment.
  • the lens 53 is for condensing the homogenized light L emitted from the fly-eye lens 31 onto, for example, the incident surface 54S1 of the waveguide type light diffusion window 54.
  • the light diffusion window 54 is, for example, a waveguide type light diffusion window as described above.
  • an acrylic plate containing nanoparticles such as titanium oxide (TiO 2) is used. It is formed.
  • the lens 53 and the waveguide type light diffusion window 54 are attached to the tip of the fly-eye lens 31 of the illuminating device 1 described in the first embodiment. I tried to arrange them in order. This makes it possible to realize a lighting device capable of smaller natural light illumination as compared with the lighting device 2 in the seventh embodiment.
  • FIG. 12 shows an example of the configuration of the optical system 60 of the lighting device 4 according to the ninth embodiment of the present disclosure.
  • the optical system 60 of the present embodiment uses a retardation plate 61 having a function as a dichroic mirror on the light incident surface (for example, the surface 61S1) instead of the retardation plate 23 of the optical system 20 shown in FIG.
  • a retardation plate 61 having a function as a dichroic mirror on the light incident surface (for example, the surface 61S1) instead of the retardation plate 23 of the optical system 20 shown in FIG.
  • the retardation plate 61 has a function that the light incident surface (for example, the surface 61S1) selectively reflects light in a wavelength band corresponding to blue, for example, and transmits light in other wavelength bands. It is a surface to have.
  • the retardation plate 61 of the present embodiment is provided with a transmission region 61X having a high transmittance of blue light on a part (for example, a central portion) of the surface 61S1.
  • the blue laser LB emitted from the light source unit 21 the blue laser LB incident on other than the transmission region 61X is reflected as blue light Lb toward the polarized dichroic mirror 24, and the blue laser incident on the transmission region 61X.
  • the LB is emitted toward the wavelength conversion element 10 as the excitation light EL. Further, the colored lights Lr, Ly, Lg, and Lb emitted from the wavelength conversion element 10 are emitted toward the polarized dichroic mirror 24 through the transmission region 61X of the retardation plate 61.
  • the light incident surface (for example, the surface 61S1) has a function as a dichroic mirror between the lens 22 and the polarized dichroic mirror 24, and one of the surfaces 61S1.
  • a retardation plate 61 having a transmission region 61X is arranged in the portion. This makes it possible to produce light containing white light Lw as part of the blue light Lb. By causing this light to enter the illumination optical system of the illumination devices 2 and 3 according to the seventh and eighth embodiments, sunlight can be expressed in a deep blue sky. Therefore, it is possible to realize the lighting device 4 capable of natural light illumination having higher reality.
  • FIG. 14 schematically shows an example of the cross-sectional configuration of the wavelength conversion element 70A according to the tenth embodiment of the present disclosure.
  • the wavelength conversion element 70A excites each color light Lr, Ly, Lg emitted in the quantum dot layer 12 and the phosphor layer 13 and the excitation light EL (blue light Lb) transmitted through the quantum dot layer 12 and the phosphor layer 13. It is a so-called transmission type wavelength conversion element that is taken out from the side opposite to the incident direction of the optical EL.
  • the wavelength conversion element 70A includes, for example, the temperature adjusting unit 11, the quantum dot layer 12, the phosphor layer 13, the light distribution control structure 14, and the reflection, similarly to the wavelength conversion element 10A of the second embodiment. It has a film 15, a dichroic mirror 16, and heat insulating portions 17 and 18.
  • the light transmitting unit 71 is provided at a position corresponding to the opening 14H of the light distribution control structure 14 of the temperature adjusting unit 11.
  • a glass substrate for example, soda glass, quartz, sapphire glass, crystal, or the like can be used.
  • the temperature adjusting unit 11 transmits the excitation light EL (blue light Lb) transmitted through the quantum dot layer 12 and the phosphor layer 13 as well as the colored lights Lr, Ly, Lg emitted in the quantum dot layer 12 and the phosphor layer 13. It is possible to take out from the lower surface (surface 11S2) side of the.
  • FIG. 15 schematically shows an example of the cross-sectional configuration of the wavelength conversion element 70B according to the eleventh embodiment of the present disclosure.
  • the wavelength conversion element 70B is the same as the wavelength conversion element 70A of the tenth embodiment, in which the colored lights Lr, Ly, Lg and the quantum dot layer 12 and the phosphor emitted in the quantum dot layer 12 and the phosphor layer 13 are emitted.
  • This is a so-called transmission type wavelength conversion element that extracts the excitation light EL (blue light Lb) transmitted through the layer 13 from the side opposite to the incident direction of the excitation light EL.
  • the wavelength conversion element 70B of the present embodiment has a light distribution control structure 74A having a parabolic surface (surface 74S1) with respect to the upper surface (surface 11S1) of the temperature adjusting unit 11 and the lower surface (surface 16S2) of the dichroic mirror 16.
  • the quantum dot layer 12 is arranged along the paraboloid surface (plane 74S1) of the light distribution control structure 74A.
  • the phosphor layer 13 is formed along the paraboloid (plane 74S2) of the optical control structure 74B.
  • Reflective films 15 are formed on the paraboloid surface (surface 74S1) of the light distribution control structure 74A and the paraboloid surface (surface 74S2) of the light distribution control structure 74B, respectively.
  • the wavelength conversion element 70A or the wavelength conversion element 70B in the lighting device for example, the lighting device 1 of the present disclosure, for example, the excitation light EL and the light emitted to the dichroic mirror 16 side (red light Lr, The polarized dichroic mirror 24 that separates the yellow light Ly and the green light Lg) becomes unnecessary. Therefore, in addition to the effect of the first embodiment, it is possible to reduce the size of the entire lighting device.
  • the color adjustment system 100 includes a light source device 110, a sensor unit 120, a control unit 130, and an adjustment unit 140.
  • FIG. 17 shows an example of the configuration of the color adjustment system 100.
  • the light source device 110 corresponds to, for example, an optical system 20 including the above-mentioned wavelength conversion element (for example, wavelength conversion element 10) and the light source unit 21.
  • the light source device 110 may include an illumination optical system 30 such as a fly-eye lens 31.
  • the sensor unit 120 has, for example, a function of acquiring information on the emission spectrum of the light emitted from the light source device 110 or the amount of light having a specific wavelength. For example, the sensor unit 120 senses all wavelengths or specific wavelengths in the visible light region, and outputs information indicating the sensing result to the control unit 130.
  • the sensor unit 120 transfers light L including the colored lights Lr, Ly, Lg emitted from the wavelength conversion element 10 and the blue laser LB (blue light Lb) emitted from the light source unit 21 to, for example, the illumination optical system 30. It can be installed on the surface of the reflection mirror 25 for guiding, for example, on the surface opposite to the reflection surface.
  • the control unit 130 functions as an arithmetic processing unit and a control device, and controls the operation of the adjustment unit 140 (specifically, the temperature adjustment unit 11).
  • the control unit 130 is composed of, for example, a CPU (Central Processing Unit) or a microprocessor.
  • the adjusting unit 140 corresponds to, for example, the temperature adjusting unit 11 of the wavelength conversion element 10.
  • the adjusting unit 140 may add an adjusting mechanism for adjusting the irradiation position of the excitation light EL on the wavelength conversion element 10, the rotation angle of the retardation plate 23, and the like.
  • the illuminating device for example, illuminating device 1 of the present disclosure
  • the color adjusting system 100 by using the color adjusting system 100, it is possible to adjust the light emitted from the wavelength conversion element 10 to a desired emission spectrum.
  • the color tone of the light emitted from the light source device 110 by adding a RAM (Random Access Memory) or the like that temporarily stores parameters and the like that change appropriately to the control unit 130 or by receiving a signal from the outside. Can be changed continuously or stepwise.
  • a RAM Random Access Memory
  • the present disclosure is not limited to the above embodiments and the like, and various modifications are possible.
  • the arrangement and number of components such as the optical system 20 and the illumination optical system 30 illustrated in the above-described embodiment are merely examples, and it is not necessary to include all the components, and other components. May be further provided.
  • the color adjustment system described as an application example of the lighting device (for example, the lighting device 1) of the above embodiment is an example, and is not limited to the above.
  • the lighting device of the present disclosure includes a headlamp of an automobile, a light source for lighting up, and a medical device. It can be applied to the light source unit.
  • the present technology can also have the following configurations.
  • the temperature adjusting unit sets the second wavelength conversion layer having higher temperature sensitivity among the first wavelength conversion layer and the second wavelength conversion layer having different temperature sensitivities and emission wavelengths from each other. It was installed on the side. This makes it possible to actively change the wavelength of the output light. Therefore, it is possible to provide a lighting device capable of efficiently performing color adjustment.
  • the first wavelength control unit is arranged between the temperature control unit and the first wavelength conversion layer, and absorbs at least one of the light emitted from the light source unit and the light in the first wavelength band as excitation light.
  • a lighting device including a second wavelength conversion layer that emits light in a second wavelength band different from the light in the wavelength band and has a higher temperature sensitivity than the first wavelength conversion layer. (2) It is arranged in at least a part between the temperature adjusting unit and the second wavelength conversion layer, controls the light distribution direction of the light in the first wavelength band and the light in the second wavelength band, and at the same time, controls the light distribution direction.
  • the lighting device according to (2) wherein the light distribution control structure has a light distribution control surface that is inclined with respect to the one surface of the temperature adjusting unit.
  • the second wavelength conversion layer is formed from the one surface of the temperature adjusting unit along the light distribution control surface.
  • the illuminating device according to (4) further comprising a light reflecting film between the one surface of the temperature adjusting unit, the light distribution control surface, and the second wavelength conversion layer.
  • a color separator is further provided above the first wavelength conversion layer.
  • an internal space composed of the temperature control section, the light distribution control structure, and the color separation section is formed.
  • the temperature adjusting unit has a plurality of regions including a first region and a second region on the one surface.
  • the second wavelength conversion layer provided in each of the first region and the second region emits light in wavelength bands different from each other as light in the second wavelength band (1).
  • (12) The lighting device according to (11), further comprising a second heat insulating portion that separates the first region and the second region.
  • the temperature adjusting unit has, as the plurality of regions, a constant temperature region that keeps the temperature of the second wavelength conversion layer constant and a temperature control region that can adjust the temperature of the second wavelength conversion layer.
  • the second wavelength conversion layer is formed to include a plurality of quantum dots.
  • the temperature adjusting unit is formed by using a Perche element or a heater.
  • the temperature adjusting unit is partially formed of a member having light transmittance.
  • a retardation plate is further arranged on the optical path of the light emitted from the first wavelength conversion layer and the second wavelength conversion layer.

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Abstract

Un dispositif d'éclairage selon un mode de réalisation de la présente divulgation comprend : une partie source de lumière ; une partie de réglage de température ayant une surface ; une première couche de conversion de longueur d'onde qui est disposée sur le côté de ladite surface de la partie de réglage de température et qui absorbe la lumière émise par la partie source de lumière en tant que lumière d'excitation et émet de la lumière dans une première bande de longueurs d'onde ; et une seconde couche de conversion de longueur d'onde qui est disposée entre la partie de réglage de température et la première couche de conversion de longueur d'onde, absorbe au moins l'une de la lumière émise par la partie source de lumière et la lumière dans la première bande de longueurs d'onde en tant que lumière d'excitation et émet de la lumière dans une seconde bande de longueurs d'onde différente de la bande de longueurs d'onde de la lumière dans la première bande de longueurs d'onde et qui a une sensibilité à la température supérieure à celle de la première couche de conversion de longueur d'onde.
PCT/JP2021/009092 2020-03-16 2021-03-08 Dispositif d'éclairage WO2021187207A1 (fr)

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Citations (7)

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Publication number Priority date Publication date Assignee Title
JP2011134619A (ja) * 2009-12-25 2011-07-07 Stanley Electric Co Ltd 光源装置および照明装置
JP2013026161A (ja) * 2011-07-25 2013-02-04 Sharp Corp 光源装置、照明装置、車両用前照灯および車両
JP2013093268A (ja) * 2011-10-27 2013-05-16 Ushio Inc 波長変換型光源装置
JP2014519710A (ja) * 2011-06-10 2014-08-14 コーニンクレッカ フィリップス エヌ ヴェ 可視パターンを提供するための蛍光改良型光源及び照明器具
JP2016145936A (ja) * 2015-02-09 2016-08-12 セイコーエプソン株式会社 照明装置およびプロジェクター
WO2017056470A1 (fr) * 2015-09-29 2017-04-06 パナソニックＩｐマネジメント株式会社 Élément de conversion de longueur d'onde et dispositif électroluminescent
WO2019230935A1 (fr) * 2018-05-31 2019-12-05 シャープ株式会社 Élément de conversion de longueur d'onde, dispositif source de lumière, phare de véhicule, dispositif d'affichage, module source de lumière et dispositif de projection

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011134619A (ja) * 2009-12-25 2011-07-07 Stanley Electric Co Ltd 光源装置および照明装置
JP2014519710A (ja) * 2011-06-10 2014-08-14 コーニンクレッカ フィリップス エヌ ヴェ 可視パターンを提供するための蛍光改良型光源及び照明器具
JP2013026161A (ja) * 2011-07-25 2013-02-04 Sharp Corp 光源装置、照明装置、車両用前照灯および車両
JP2013093268A (ja) * 2011-10-27 2013-05-16 Ushio Inc 波長変換型光源装置
JP2016145936A (ja) * 2015-02-09 2016-08-12 セイコーエプソン株式会社 照明装置およびプロジェクター
WO2017056470A1 (fr) * 2015-09-29 2017-04-06 パナソニックＩｐマネジメント株式会社 Élément de conversion de longueur d'onde et dispositif électroluminescent
WO2019230935A1 (fr) * 2018-05-31 2019-12-05 シャープ株式会社 Élément de conversion de longueur d'onde, dispositif source de lumière, phare de véhicule, dispositif d'affichage, module source de lumière et dispositif de projection

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