WO2021095397A1 - Élément de conversion de longueur d'onde, roue fluorescente, dispositif de source de lumière, phare de vehicule et dispositif de projection - Google Patents

Élément de conversion de longueur d'onde, roue fluorescente, dispositif de source de lumière, phare de vehicule et dispositif de projection Download PDF

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WO2021095397A1
WO2021095397A1 PCT/JP2020/037833 JP2020037833W WO2021095397A1 WO 2021095397 A1 WO2021095397 A1 WO 2021095397A1 JP 2020037833 W JP2020037833 W JP 2020037833W WO 2021095397 A1 WO2021095397 A1 WO 2021095397A1
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Prior art keywords
wavelength conversion
light source
conversion element
fluorescent
substrate
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PCT/JP2020/037833
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English (en)
Japanese (ja)
Inventor
裕一 一ノ瀬
豪 鎌田
英臣 由井
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シャープ株式会社
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Publication of WO2021095397A1 publication Critical patent/WO2021095397A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • 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
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • 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
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • 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
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the present disclosure relates to wavelength conversion elements, fluorescent wheels, light source devices, vehicle headlights, and projection devices. This disclosure claims priority based on Japanese Patent Application No. 2019-204697 filed in Japan on November 12, 2019, the contents of which are incorporated herein by reference.
  • a wavelength conversion element that irradiates a phosphor with excitation light such as a blue laser to emit light
  • excitation light such as a blue laser to emit light
  • a fluorescent guide is provided by lowering the pore density of the phosphor layer near the laser spot and increasing the pore density around the laser spot. A wavelength conversion element that suppresses is described.
  • Patent Document 2 describes a light source device that improves the reflectance and enhances the utilization efficiency of reflected light by providing a reflective portion containing titanium oxide in the lower layer of the fluorescent light emitting portion.
  • Patent Document 3 describes a light source device that attempts to utilize the fluorescence emitted from the side surface of the phosphor layer by providing a recess in the substrate and providing a reflecting member and a phosphor layer in the recess.
  • Patent Document 4 in order to improve the fluorescence efficiency and the thermal conductivity, an adhesive layer containing particles having a higher thermal conductivity than the base material and a higher light reflectance than the light reflecting layer is provided. , A fluorescent wheel in which a phosphor layer and a light reflecting layer are bonded is described.
  • JP-A-2017-111170 (published on June 22, 2017) Japanese Unexamined Patent Publication No. 2013-228598 (published on November 7, 2013) Japanese Unexamined Patent Publication No. 2015-1315455 (published on July 27, 2015)
  • FIG. 2 is a cross-sectional view schematically showing a wavelength conversion element of a related technology in which a fluorescent layer is laminated on a substrate.
  • the fluorescence generated by irradiating the fluorescent layer with the excitation light diffuses in various directions in the layer.
  • a part of the diffused fluorescence goes to the extraction side of the fluorescent layer, and is extracted from the extraction side and used.
  • the extraction side is the surface of the fluorescent layer facing the contact surface between the fluorescent layer and the substrate, and when the wavelength conversion element is a reflection type, the surface on which the excitation light is incident is intended and the wavelength conversion is performed.
  • the element is a transmissive type, it is intended to be a surface facing the surface on which the excitation light is incident.
  • the wavelength conversion element described in Patent Document 1 attempts to improve the fluorescence extraction efficiency by suppressing the light guide of fluorescence by a phosphor layer having a high pore density, but in regions having different pore densities. It is difficult to make them properly. Further, since the fluorescence guides the gaps between the pores, the effect of sufficiently improving the extraction efficiency cannot be obtained.
  • the light source device described in Patent Document 2 improves the reflectance of light toward the substrate side among the fluorescence not directed to the extraction side to improve the extraction efficiency of the fluorescence, but is on the side surface of the fluorescence layer. The heading light is still unavailable.
  • the present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a wavelength conversion element which has improved fluorescence extraction efficiency and is easy to manufacture.
  • the wavelength conversion element is arranged on a substrate having a first surface forming a planar shape and on the first surface side of the substrate, and has a plurality of fluorescences.
  • a fluorescent layer containing body particles and emitting fluorescence by excitation light, and a part of fluorescence arranged on the first surface of the substrate and having an emission angle ⁇ 1 from the fluorescent layer satisfying at least the first condition are present.
  • Three-dimensional polar coordinates that include a scattering layer that changes direction to fluorescence emitted at an extraction angle ⁇ 2 that satisfies the condition of 2, and has a negative z-axis direction in a direction perpendicular to the inside of the substrate from the first surface of the substrate.
  • the exit angle ⁇ 1 formed in the z-axis positive direction is ⁇ / 2 ⁇ ⁇ 1 ⁇
  • the take-out angle ⁇ 2 formed in the z-axis positive direction is 0 ⁇ . It is characterized in that ⁇ 2 ⁇ / 2.
  • FIG. 5 is a cross-sectional view illustrating the distance d between the end of the fluorescent layer and the end of the scattering layer and the film thickness t of the fluorescent layer in the wavelength conversion element according to the second embodiment of the present disclosure. It is a graph which shows the relationship between the ratio X of fluorescence which a direction is changed by a scattering layer, and d / t. It is sectional drawing which shows typically the wavelength conversion element which concerns on Embodiment 3 of this disclosure.
  • FIG. 1 is a cross-sectional view schematically showing the wavelength conversion element 10 according to the first embodiment of the present disclosure.
  • the wavelength conversion element 10 includes a substrate 1 having a first surface forming a planar shape, a fluorescent layer 2 arranged on the first surface side of the substrate 1, and a first surface of the substrate 1. It is provided with a scattering layer 3 arranged on the surface of the above.
  • the fluorescent layer 2 is a layer that contains a plurality of phosphor particles and emits fluorescence by excitation light.
  • the fluorescent layer 2 does not have to be in direct contact with the substrate 1, and may be arranged on the first surface side of the substrate 1, that is, on the same side as the scattering layer 3. If the fluorescent layer 2 is arranged on the first surface side of the substrate 1, another member may be provided between the fluorescent layer 2 and the substrate 1 as in the second embodiment.
  • the scattering layer 3 is a layer in which a part of the fluorescence whose emission angle ⁇ 1 from the fluorescent layer 2 satisfies at least the first condition below is changed to the fluorescence emitted at the extraction angle ⁇ 2 which satisfies the second condition below. Is.
  • the emission angle ⁇ 1 is the three-dimensional polar coordinates in which the direction perpendicular to the inside of the substrate 1 from the first surface of the substrate 1 is the negative z-axis direction, and the fluorescence emitted from the fluorescent layer 2 is in the positive z-axis direction. It is a polar angle.
  • the extraction angle ⁇ 2 is a polar angle formed by the fluorescence whose direction is changed by the scattering layer in the above three-dimensional polar coordinates in the positive direction of the z-axis.
  • the fluorescence emitted from the side surface of the fluorescence layer 2 at the emission angle ⁇ 1 that satisfies the first condition is dispersed in a direction that cannot be used.
  • the scattering layer 3 by providing the scattering layer 3, at least a part of the traveling direction of the fluorescence can be changed to the fluorescence emitted at the extraction angle ⁇ 2 satisfying the second condition.
  • the fluorescence whose direction is changed in this way can be taken out and used in the same manner as the fluorescence emitted from the fluorescence layer 2 toward the taking-out side. As a result, the efficiency of extracting fluorescence can be improved.
  • Fluorescence extraction efficiency is intended as "fluorescence intensity emitted at an extraction angle ⁇ 2 satisfying the second condition” / "excitation light intensity”, and "efficiency in which emitted fluorescence is emitted in a direction in which it can be extracted”. Is included.
  • the scattering layer 3 may be arranged so as to be in direct contact with the substrate 1 on the first surface of the substrate 1 and to be able to change the direction as described above.
  • the scattering layer 3 is formed so as to form a side wall surrounding the fluorescent layer 2 in a plan view from the positive direction of the z-axis.
  • the substrate 1 and the fluorescent layer 2 are formed. It may be arranged between and.
  • the inclination angle of the side surface of the scattering layer 3, that is, the angle ⁇ x of the polar angle formed by the side surface of the scattering layer 3 facing the side surface of the fluorescent layer 2 and the positive direction of the z-axis is not particularly limited, and 0 ⁇ ⁇ x ⁇ /. It may be any angle of 2 or ⁇ / 2 ⁇ x ⁇ .
  • the substrate 1 is a reflective substrate that reflects light, and the excitation light is incident from the first surface side of the substrate 1.
  • the reflective substrate is not particularly limited, but a metal substrate, for example, an aluminum substrate, a highly reflective alumina substrate, a white perfect scattering substrate, or the like can be used.
  • a highly reflective film such as silver may be coated on the substrate.
  • the substrate 1 is a translucent substrate that transmits light, and the excitation light is incident from the second surface side facing the first surface of the substrate 1.
  • the translucent substrate is not particularly limited, but a glass substrate or the like can be used.
  • the fluorescent layer 2 contains a first binder and phosphor particles dispersed in the first binder.
  • the first binder may be a binder containing an inorganic compound or a binder containing an organic compound.
  • the inorganic compound include alumina, silica and the like.
  • the organic compound include silicone resin and the like.
  • phosphor particles conventionally known organic phosphor particles and inorganic phosphor particles that emit fluorescence in a predetermined wavelength range by excitation light can be used.
  • the ratio of the phosphor particles to the fluorescent layer 2 is preferably about 50% by volume or more and about 75% by volume or less with respect to the fluorescent layer 2 from the viewpoint of light utilization efficiency and film thickness.
  • the volume-based median diameter (D50) of the phosphor particles is preferably about 1 ⁇ m or more and about 50 ⁇ m or less from the viewpoint of luminous efficiency and film thickness.
  • the median diameter of the particles is a numerical value measured by a laser diffraction type particle size distribution measuring device.
  • the thickness of the fluorescent layer 2 is preferably about 20 ⁇ m or more and about 120 ⁇ m or less from the viewpoint of light utilization efficiency and heat conduction.
  • the scattering layer 3 contains a second binder and scattered particles dispersed in the second binder.
  • the binder exemplified in the first binder can be used as the second binder.
  • the first binder and the second binder may be different binders or the same binder.
  • scattered particles include metal particles such as silver and metal oxide particles such as titanium oxide (TiO2) and zinc oxide (ZnO).
  • the ratio of the scattered particles to the scattering layer 3 is preferably 10% by volume or more, more preferably 50% by volume or more, and preferably 75% by volume or less with respect to the scattering layer 3. It is more preferably 70% by volume or less.
  • the volume-based median diameter (D50) of the scattered particles is preferably about 100 nm or more and about 5 ⁇ m or less from the viewpoint of the scattering effect and the film thickness.
  • the thickness of the scattering layer 3 is preferably about 20 ⁇ m or more and about 120 ⁇ m or less from the viewpoint of scattering effect and heat conduction.
  • the wavelength conversion element 10 forms the scattering layer 3 by screen-printing a mixture of the second binder and the scattered particles on the first surface of the substrate 1, and then the first binder and the phosphor particles.
  • the mixture can be produced by screen printing on the first surface side, drying and baking.
  • a dispenser may be used.
  • the inclination angle ⁇ x of the side surface of the scattering layer 3 is somewhat in the range of 0 ⁇ X ⁇ / 2 with respect to the positive z-axis direction unless otherwise controlled. It is formed at an angle. Therefore, the scattering layer 3 can be formed at a preferable inclination angle ⁇ x by a simple manufacturing method.
  • the wavelength conversion element 20 of the present embodiment is arranged in that the scattering layer 3 is arranged on the first surface of the substrate 1 and the fluorescence layer 2 is arranged on the scattering layer 3. Different from the first embodiment. Further, the wavelength conversion element 20 is a reflection type, and the excitation light is incident from the first surface side of the substrate 1.
  • the substrate 1 may be a translucent substrate or a reflective substrate. Each other configuration is the same as the configuration described in the first embodiment.
  • the wavelength conversion element 20 is formed so that the area of the scattering layer 3 on the xy plane orthogonal to the z-axis is larger than the area of the fluorescence layer 2 on the xy plane.
  • FIG. 4 shows the distance d between the end of the fluorescent layer 2 and the end of the scattering layer 3 on the xy plane orthogonal to the z-axis and the film thickness t of the fluorescent layer 2 in the wavelength conversion element 20 of the second embodiment. It is sectional drawing explaining.
  • FIG. 5 is a graph showing the relationship between X and d / t. From the viewpoint of improving the extraction efficiency, the d / t is preferably 2 or more, and more preferably 7 or more.
  • the d / t is preferably 50 or less, and more preferably 20 or less.
  • the wavelength conversion element 20 forms the scattering layer 3 by screen-printing a mixture of the second binder and the scattered particles on the first surface of the substrate 1, and then the first binder and the phosphor particles.
  • the mixture can be produced by screen printing on the scattering layer 3, drying and firing.
  • a dispenser may be used.
  • the wavelength conversion element 30 of the present embodiment is at least one of the side surfaces of the side wall formed by the scattering layer 3 facing the side surface of the fluorescent layer 2 (hereinafter, also simply referred to as “opposing surface”). It differs from the first embodiment in that the portion is in contact with at least a part of the side surface of the fluorescent layer 2.
  • Each other configuration is the same as the configuration described in the first embodiment.
  • the second binder constituting the scattering layer 3 has a higher thermal conductivity than air. Therefore, since the wavelength conversion element 30 of the present embodiment can dissipate the heat generated in the fluorescent layer 2 to the scattering layer 3, it is possible to further suppress the decrease in brightness due to temperature quenching as compared with the first embodiment.
  • the second binder may be a binder containing an organic compound, but from the viewpoint of heat dissipation, a binder containing an inorganic compound is preferable.
  • the interface where the side surface of the fluorescent layer 2 and the facing surface of the side wall formed by the scattering layer 3 are in contact with each other may be inclined at an arbitrary angle with respect to the positive direction of the z-axis.
  • FIG. 6 shows a configuration in which the cross section of the side wall formed by the scattering layer 3 on the plane parallel to the z-axis has a divergent shape in the negative direction of the z-axis.
  • the cross section on the plane parallel to the z-axis may have a divergent shape in the negative direction of the z-axis.
  • the interface between the side surface of the fluorescent layer 2 and the facing surface of the scattering layer 3 does not have to be inclined with respect to the positive direction of the z-axis.
  • the scattering layer 3a is arranged on the first surface of the substrate 1, the fluorescent layer 2 is arranged on the scattering layer 3a, and further, scattering is performed.
  • the layer 3b differs from the first embodiment and the second embodiment in that the layer 3b is arranged so as to form a side wall surrounding the fluorescent layer 2.
  • the wavelength conversion element 40 is a reflection type, and the excitation light is incident from the first surface side of the substrate 1.
  • the substrate 1 may be a translucent substrate or a reflective substrate. Each other configuration is the same as the configuration described in the first and second embodiments.
  • the inner side surface of the side wall formed by the scattering layer 3b and the side surface of the fluorescent layer 2 are not in contact with each other, but as shown in FIG. 10, these surfaces are in contact with each other. There may be.
  • the vehicle headlights include the wavelength conversion elements 10, 20, 30, and 40 according to the first to fourth embodiments, the light source that irradiates the wavelength conversion elements 10, 20, 30, and 40 with excitation light, and the wavelength conversion element 10.
  • a reflector having a reflecting surface that reflects the fluorescence emitted from 20, 30, and 40 is provided, and the reflecting surface of the reflector has a shape that reflects the incident light so as to be emitted in parallel in a certain direction.
  • the light source is preferably a blue laser light source that emits excitation light having a wavelength that excites the fluorescence layer 2 of the wavelength conversion elements 10, 20, 30, and 40.
  • the reflector is preferably composed of a semi-parabolic mirror. It is preferable that the paraboloid is divided into two vertically in parallel with the xy plane to form a semi-paraboloid, and the inner surface thereof is a mirror.
  • the reflector has a through hole through which the excitation light passes.
  • the wavelength conversion elements 10, 20, 30, and 40 are excited by blue excitation light and fluoresce emit light in the long wavelength region (yellow wavelength) of visible light.
  • the excitation light also hits the wavelength conversion elements 10, 20, 30, and 40 and becomes diffusely reflected light.
  • the wavelength conversion elements 10, 20, 30, and 40 are arranged at the focal positions of the paraboloid.
  • the wavelength conversion elements 10, 20, 30, and 40 are at the focal positions of the parabolic mirror, the fluorescence emission and diffuse reflection light emitted from the wavelength conversion elements 10, 20, 30, and 40 hit the reflector. When reflected, it goes straight to the exit surface uniformly.
  • White light which is a mixture of fluorescent light and diffusely reflected light, is emitted from the exit surface as parallel light.
  • the substrate 1 of the wavelength conversion elements 10, 20, 30, and 40 of the first to fourth embodiments is a wheel.
  • at least one of the wavelength conversion elements 10, 20, 30, and 40 is arranged in at least a part in the circumferential direction of the surface of the wheel through which the excitation light emitted from the light source passes.
  • At least one of the wavelength conversion elements 10, 20, 30, and 40 may be arranged in at least a part in the circumferential direction of the surface of the wheel through which the excitation light emitted from the light source passes, and the wavelength conversion is performed.
  • the elements 10, 20, 30, and 40 are preferably arranged concentrically on the wheel.
  • FIGS. 11 to 14 show a plan view (xy plane) of the fluorescent wheel.
  • the fluorescent layer 148 is deposited around the surface of the wheel 141.
  • the fluorescent wheel is divided into a plurality of segments in the circumferential direction, and the phosphor is applied to each segment, so that the external quantum yield can be maintained at a high level. This makes it possible to create various colors while maintaining brightness.
  • FIG. 11 is a plan view showing a mode in which the fluorescent wheel is divided into a plurality of segments and a plurality of different fluorescent layers 148 are deposited for each segment in at least a part in the circumferential direction through which the excitation light passes.
  • the fluorescent layer 148a fluoresces at a wavelength corresponding to red
  • the fluorescent layer 148b fluoresces at a wavelength corresponding to green when irradiated with excitation light.
  • the fluorescent wheel usually preferably reflects the excitation light, but a part of the segment can be a transmitting portion 143 through which the excitation light is transmitted.
  • the transmissive portion 143 is preferably made of glass. With such a segment configuration, the excitation light can be converted into a plurality of wavelengths by one fluorescent wheel.
  • FIGS. 12-14 show another preferred embodiment.
  • FIG. 12 shows a configuration in which the segment designated as the transmission portion 143 in FIG. 11 is the reflection portion.
  • FIG. 13 shows a configuration in which the segment as the reflection portion of FIG. 12 is the transmission portion 143.
  • FIG. 14 shows a fluorescent wheel with yet another segment. It is preferable that the fluorescent layer 148c is deposited on yet another segment. It is preferable that the fluorescent layer 148c fluoresces at a wavelength corresponding to yellow by irradiation with excitation light.
  • the fluorescent layers 148, 148a, 148b, and 148c the fluorescent layers 2 of the wavelength conversion elements 10, 20, 30, and 40 of the first to fourth embodiments can be adopted.
  • the light source device includes the fluorescence wheel according to the sixth embodiment, a driving device for rotating the fluorescence wheel, and a light source for irradiating the wavelength conversion elements 10, 20, 30, and 40 with excitation light.
  • the light source device emits fluorescence when excitation light is incident on the fluorescence layers 2 of the wavelength conversion elements 10, 20, 30, and 40 arranged at least in the circumferential direction of the surface of the fluorescence wheel as the fluorescence wheel rotates. ..
  • the light source device is preferably used for a projector or the like.
  • the light source is preferably a blue laser light source that emits excitation light having a wavelength that excites the fluorescence layer 2 of the wavelength conversion elements 10, 20, 30, and 40.
  • FIG. 15 shows a side view showing the configuration of the light source device 101.
  • the fluorescent wheel is fixed to the rotating shaft 147 of the drive device 142 by a fixture 146.
  • the drive device 142 is preferably a motor, and a fluorescent wheel fixed to a rotating shaft 147, which is a rotating shaft of the motor, with a fixture 146 rotates with the rotation of the motor.
  • the fluorescent layer 148 deposited on the peripheral portion on the surface of the wheel 141 receives the excitation light and emits fluorescent light. Since the fluorescent layer 148 rotates with the rotation of the fluorescent wheel, the fluorescent layer 148 emits fluorescent light while rotating at any time. As the fluorescent wheel, the fluorescent wheel of the fifth embodiment can be adopted.
  • FIG. 16 shows a schematic view showing the configuration of the projection device 100 using the light source device 101 according to the seventh embodiment.
  • the projection device 100 includes a light source device 101, a rotation position sensor 103 that acquires the rotation position of the fluorescent wheel, a light source control unit 104 that controls the light source 13 based on output information from the rotation position sensor 103, and a display element 107.
  • the light source side optical system 106 that guides the light from the light source device to the display element 107, and the projection side optical system 108 that projects the projected light from the display element 107 onto the screen are provided.
  • the projection device 100 controls the output of the light source 13 based on the information on the rotation position of the fluorescent wheel acquired by the rotation position sensor 103.
  • the light source device includes a fluorescence wheel in which a wavelength conversion element is divided into a plurality of segments in the circumferential direction and arranged in at least a part of the circumferential direction through which the excitation light 14 emitted from the light source 13 passes. It may be an undivided fluorescent wheel.
  • the excitation light 14 of blue light emission passes through the fluorescent wheel via the transmitting portion 143.
  • the excitation light 14 that irradiates the fluorescent layer 148 can pass through the light source side optical system 106 and the mirrors 109a to 109c on the optical path.
  • the light source side optical system 106 is preferably a dichroic mirror.
  • a preferred dichroic mirror can reflect blue light incident at 45 degrees and transmit red and green light.
  • the blue light from the excitation light 14 incident on the dichroic mirror is reflected and directed to the fluorescent wheel.
  • blue light is transmitted through the fluorescent wheel through the transmission portion 143.
  • the excitation light 14 irradiated to the segment other than the transmission portion 143 due to the rotation timing of the fluorescent wheel emits fluorescence by irradiating the fluorescent layer 148.
  • the fluorescence layer 148a emits fluorescence in the red wavelength band
  • the fluorescence layer 148b emits fluorescence in the green wavelength band.
  • the fluorescently emitted red and green lights pass through the dichroic mirror and enter the display element 107.
  • the blue light transmitted through the transmission unit 143 is incident on the dichroic mirror again through the mirrors 109a to 109c, is reflected again by the dichroic mirror, and is incident on the display element 107.
  • the projector can include the light source device 101, a display element 107, a light source side optical system 106 (dichroic mirror), and a projection side optical system 108.
  • the light source side optical system 106 (dichroic mirror) guides the light from the light source device 101 to the display element 107, and the projection side optical system 108 projects the projected light from the display element 107 onto a screen or the like. it can.
  • the display element 107 is preferably a DMD (Digital Mirror Device).
  • the projection side optical system 108 preferably consists of a combination of projection lens.
  • the wavelength conversion elements (10, 20, 30, 40) according to the first aspect of the present disclosure are on a substrate (1) having a first surface forming a planar shape and on the first surface side of the substrate (1).
  • a fluorescent layer (2, 148, 148a, 148b, 148c) that is arranged and contains a plurality of phosphor particles and emits fluorescence by excitation light (14) and is arranged on the first surface of the substrate (1).
  • a part of the fluorescence whose emission angle ⁇ 1 from the fluorescent layer (2, 148, 148a, 148b, 148c) satisfies at least the first condition is changed to the fluorescence emitted at the extraction angle ⁇ 2 which satisfies the second condition.
  • the first The condition is that the emission angle ⁇ 1 formed in the positive direction of the z-axis is ⁇ / 2 ⁇ ⁇ 1 ⁇ , and the second condition is that the extraction angle ⁇ 2 formed in the positive direction of the z-axis is 0 ⁇ ⁇ 2 ⁇ / 2.
  • the scattering layer (3, 3a) is arranged on the first surface of the substrate (1), and the fluorescent layer. (2, 148, 148a, 148b, 148c) is arranged on the scattering layer (3, 3a), and the area of the scattering layer (3, 3a) in the xy plane orthogonal to the z axis is the area of the scattering layer (3, 3a) in the xy plane.
  • the configuration may be larger than the area of the fluorescent layer (2, 148, 148a, 148b, 148c).
  • the wavelength conversion element (10, 30, 40) is the scattering layer (3, 3b) arranged on the first surface of the substrate (1) in the above aspect 1 or 2. Is a configuration that constitutes a side wall surrounding the fluorescent layer (2, 148, 148a, 148b, 148c) arranged on the first surface side of the substrate (1) in a plan view from the z-axis positive direction. May be good.
  • the wavelength conversion element (30, 40) has at least a part of the inner side surface of the side wall formed by the scattering layer (3, 3b). It may be configured to be in contact with at least a part of the side surface of the fluorescent layer (2, 148, 148a, 148b, 148c).
  • the fluorescent wheel according to the fifth aspect of the present disclosure is a fluorescent wheel in which the substrate (1) of the wavelength conversion element (10, 20, 30, 40) according to any one of the above aspects 1 to 4 is a wheel (141).
  • the wavelength conversion elements (10, 20, 30, 40) are arranged at least in the circumferential direction of the surface of the wheel through which the excitation light (14) emitted from the light source (13) passes. It is a configuration that has.
  • the light source device (101) includes the fluorescent wheel according to the fifth aspect, a driving device (142) for rotating the fluorescent wheel, and the wavelength conversion element (10, 20, 30, 40).
  • a light source (13) that irradiates excitation light (14)
  • the wavelength conversion elements (10, 20, 30) are arranged at least in the circumferential direction of the surface of the fluorescent wheel as the fluorescent wheel rotates. , 40), when the excitation light (14) is incident on the fluorescent layer (2, 148, 148a, 148b, 148c), the fluorescence is emitted.
  • the vehicle headlights according to the seventh aspect of the present disclosure include the wavelength conversion element (10, 20, 30, 40) according to any one of the above aspects 1 to 4, and the wavelength conversion element (10, 20, 30).
  • , 40) is provided with a light source for irradiating excitation light and a reflector having a reflecting surface for reflecting fluorescence emitted from the wavelength conversion elements (10, 20, 30, 40), and the reflecting surface of the reflector is incident. It has a shape that reflects the emitted light so as to be emitted in parallel in a certain direction.
  • the projection device (100) according to the eighth aspect of the present disclosure is the light source device (101), the display element (107), and the light from the light source device (101) according to the sixth aspect. ), And a projection side optical system (108) that projects the projected light from the display element (107) onto the screen.
  • the projection device (100) according to the ninth aspect of the present disclosure is described in any one of the above aspects 1 to 4 in at least a part of the circumferential direction through which the excitation light (14) emitted from the light source (13) passes.
  • the light source side optical system (106) that guides the light from the display element (107) to the display element (107), and the projection side optical system (108) that projects the projected light from the display element (107) onto the screen.
  • the output of the light source (13) is controlled by the information on the rotation position of the fluorescent wheel acquired by the rotation position sensor (103).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un élément de conversion de longueur d'onde avec lequel une efficacité d'extraction de lumière fluorescente peut être améliorée et qui peut être facilement fabriqué. L'élément de conversion de longueur d'onde est caractérisé en ce qu'il comprend : un substrat qui constitue une forme plane; une couche fluorescente qui est disposée sur un premier côté de surface du substrat; et une couche de diffusion qui est disposée sur la première surface du substrat et qui change de manière directionnelle une partie de la lumière fluorescente qui présente un angle d'émission (θ1) à partir de la couche fluorescente de π/2≦θ1<π en lumière fluorescente qui est émise selon un angle d'extraction θ2 satisfaisant 0≦θ2<π/2.
PCT/JP2020/037833 2019-11-12 2020-10-06 Élément de conversion de longueur d'onde, roue fluorescente, dispositif de source de lumière, phare de vehicule et dispositif de projection WO2021095397A1 (fr)

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JP2019204697A JP2023002851A (ja) 2019-11-12 2019-11-12 波長変換素子、蛍光ホイール、光源装置、車両用前照灯具及び投影装置
JP2019-204697 2019-11-12

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013016268A (ja) * 2011-06-30 2013-01-24 Sharp Corp 発光装置
JP2013228598A (ja) * 2012-04-26 2013-11-07 Panasonic Corp 光源装置及び該光源装置を備える投写型表示装置
JP2015135455A (ja) * 2014-01-20 2015-07-27 セイコーエプソン株式会社 光源装置およびプロジェクター
JP2016012116A (ja) * 2014-06-02 2016-01-21 カシオ計算機株式会社 光源装置及び投影装置
JP2016058624A (ja) * 2014-09-11 2016-04-21 パナソニックＩｐマネジメント株式会社 発光装置
JP2019066680A (ja) * 2017-10-02 2019-04-25 株式会社小糸製作所 波長変換部材および光源モジュール
JP2019525389A (ja) * 2016-06-22 2019-09-05 ルミレッズ ホールディング ベーフェー 光変換パッケージ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013016268A (ja) * 2011-06-30 2013-01-24 Sharp Corp 発光装置
JP2013228598A (ja) * 2012-04-26 2013-11-07 Panasonic Corp 光源装置及び該光源装置を備える投写型表示装置
JP2015135455A (ja) * 2014-01-20 2015-07-27 セイコーエプソン株式会社 光源装置およびプロジェクター
JP2016012116A (ja) * 2014-06-02 2016-01-21 カシオ計算機株式会社 光源装置及び投影装置
JP2016058624A (ja) * 2014-09-11 2016-04-21 パナソニックＩｐマネジメント株式会社 発光装置
JP2019525389A (ja) * 2016-06-22 2019-09-05 ルミレッズ ホールディング ベーフェー 光変換パッケージ
JP2019066680A (ja) * 2017-10-02 2019-04-25 株式会社小糸製作所 波長変換部材および光源モジュール

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