Light emission module

Abstract

Provided is a light emission module that provides a high degree of freedom in changing the color of light. This light emission module comprises: a plurality of light-emitting units; an optical member that includes at least one first region from which light having a first chromaticity can be extracted and at least one second region from which light having a second chromaticity different from the first chromaticity can be extracted, and allows light emitted from the light-emitting units 1 to transmit or pass therethrough; a variable mechanism for changing the distance between the optical member and the light-emitting units; and a first lens into which the light having transmitted or passed through the optical member enters. At least one of the first and second regions is provided so as to be paired with the light-emitting units. The variable mechanism changes the distance between the optical member and the light-emitting units in a direction along the center axis of the first lens.

Description

Light-emitting module

[0001] The present disclosure relates to a light emitting module.

[0002] 2. Description of the Related Art A light-emitting module is known that adjusts the color of light by using an optical member that converts the wavelength of light emitted from a light-emitting unit.

[0003] In addition, a configuration has been disclosed in which the thickness of the sealing resin directly above multiple sets of light-emitting elements is different for each set, so that when only one set of multiple light-emitting elements is made to emit light, the chromaticity of the light emitted from the sealing resin is different from each other (see, for example, Patent Document 1).

[0004] Japanese Patent Application Laid-Open No. 2017-120897

[0005] However, in the configuration of Patent Document 1, each of the plurality of sets of light-emitting units is made to emit light separately, so there is little freedom in adjusting the color of the light-emitting module.

[0006] An object of the present disclosure is to provide a light-emitting module with a high degree of freedom in adjusting the color of light.

[0007] An optical module according to one embodiment of the present disclosure includes a plurality of light-emitting units, at least one first region capable of extracting light of a first chromaticity, and at least one second region capable of extracting light of a second chromaticity different from the first chromaticity, and has an optical element that transmits or passes light emitted by the plurality of light-emitting units, a variable mechanism that changes the distance between the plurality of light-emitting units and the optical element, and a first lens onto which light that has transmitted or passed through the optical element is incident, wherein at least one of the first region and the second region is arranged to form a pair with each of the plurality of light-emitting units, and the variable mechanism changes the distance between the light-emitting units and the optical element in a direction along the central axis of the first lens.

[0008] According to an embodiment of the present disclosure, a light-emitting module with a high degree of freedom in adjusting the color of light can be provided.

[0009] FIG. 1 is a top view illustrating the configuration of a light-emitting module according to a first embodiment. FIG. 2 is a cross-sectional view taken along the line II of FIG. 1. FIG. 3 is a top view illustrating a plurality of light-emitting units as viewed from the first lens side. FIG. 4 is a cross-sectional view taken along the line III-III of FIG. 3. FIG. 5 is a top view illustrating the configuration of a filter according to a first embodiment. FIG. 6 is a cross-sectional view taken along the line V-V of FIG. 5. FIG. 7 is a cross-sectional view illustrating the light-emitting module of FIG. 2 after the filter has been moved. FIG. 1 is a first view showing light passing through a filter. FIG. 2 is a second view showing light passing through a filter. FIG. 3 is a view showing a filter including a plurality of first regions and a plurality of second regions. FIG. 4 is a view showing an example configuration of a filter in which the first regions are through-holes. FIG. 5 is a view showing an example configuration of a filter in which the first regions are through-holes. FIG. 6 is a view showing an example configuration of a filter in which the first regions are through-holes. FIG. 7 is a view showing an example configuration of a filter in which the first regions are through-holes. １ and the directivity half angle θ. ２ 19 is a diagram illustrating the relationship between the directional half-value angle θ and the area width p. FIG. 19 is a cross-sectional view illustrating the configuration of a light-emitting module according to a second embodiment. FIG. 19 is a cross-sectional view illustrating the light-emitting module of FIG. 11 after the wavelength conversion member has been moved. FIG. 19 is a cross-sectional view illustrating the configuration of a wavelength conversion member according to a modified example. FIG. 19 is a cross-sectional view illustrating the configuration of a light-emitting module according to a third embodiment. FIG. 19 is a cross-sectional view illustrating the light-emitting module of FIG. 14 after the filter and the plurality of second lenses have been moved together. FIG. 19 is a first view showing light transmitted through the filter and the plurality of second lenses. FIG. 19 is a second view showing light from the filter and the plurality of second lenses. FIG. 19 is a cross-sectional view illustrating the configuration of a light-emitting module according to a fourth embodiment. FIG. 19 is a cross-sectional view illustrating the configuration of a light-emitting module according to a fifth embodiment. FIG. 19 is a cross-sectional view taken along the XIX-XIX line in FIG.

[0010] Hereinafter, a description will be given of an embodiment of the invention with reference to the drawings. In the following description, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or members. Duplicate descriptions of the same or equivalent parts or members will be omitted as appropriate. In some cases, an end view showing only the cut surface is used as a cross-sectional view.

[0011] The following embodiments are intended to exemplify light-emitting modules embodying the technical concepts of the present invention, and are not intended to limit the present invention to the following embodiments. The dimensions, materials, shapes, relative positions, and other details of the components described below are intended for illustrative purposes only, unless otherwise specified. Furthermore, the sizes and positional relationships of components shown in the drawings may be exaggerated for clarity.

[0012] In the following drawings, directions may be indicated by the X-axis, Y-axis, and Z-axis, but the X-direction along the X-axis indicates any one direction, the Y-direction along the Y-axis indicates a direction substantially perpendicular to the X-direction, and the Z-direction along the Z-axis indicates a direction substantially perpendicular to both the X-direction and the Y-direction.

[0013] Furthermore, the direction in which the arrow points in the X direction is denoted as the +X direction, and the direction opposite to the +X direction is denoted as the -X direction. The direction in which the arrow points in the Y direction is denoted as the +Y direction, and the direction opposite to the +Y direction is denoted as the -Y direction. The direction in which the arrow points in the Z direction is denoted as the +Z direction, and the direction opposite to the +Z direction is denoted as the -Z direction. In the embodiments, each of the multiple light-emitting units included in the light-emitting module emits light toward the +Z direction, for example. In the drawings, the light emitted from the light-emitting unit may be indicated by an arrow with a solid or dashed line. Furthermore, the term "top view" in the embodiments refers to viewing the light-emitting module from the +Z direction. However, this does not limit the orientation of the light-emitting module during use, and the orientation of the light-emitting module is arbitrary. Furthermore, in the present embodiment, the surface of an object viewed from the +Z direction is referred to as the "top surface," and the surface of the object viewed from the -Z direction is referred to as the "bottom surface."

[0014] The optical axes of the plurality of light-emitting units and the central axis of the first lens are aligned along the Z axis. In the following embodiments, being aligned along the X axis, Y axis, and Z axis includes an object having a tilt within a range of ±10° with respect to these axes.

[0015] A light-emitting module according to an embodiment is used for various applications such as illumination or light irradiation. The light-emitting module includes a plurality of light-emitting units, at least one first region capable of extracting light of a first chromaticity, and at least one second region capable of extracting light of a second chromaticity different from the first chromaticity, and an optical element that transmits or passes light emitted by the plurality of light-emitting units. The light-emitting module also includes a variable mechanism that changes the distance between the plurality of light-emitting units and the optical element, and a first lens that irradiates light that has transmitted or passed through the optical element. The variable mechanism changes the distance between the light-emitting units and the optical element in a direction along the central axis of the first lens.

[0016] The optical element adjusts the ratio of the amount of light emitted by each of the plurality of light-emitting elements, with respect to the light of different colors that has passed through or transmitted through the first region and the second region, and then outputs the light. In this specification, adjusting the ratio of the amount of light of different colors includes mixing light of different colors. In an embodiment, a light-emitting module with a high degree of freedom in light color adjustment can be provided by changing the distance between the plurality of light-emitting elements and the optical element using a variable mechanism and arbitrarily varying the chromaticity of the light mixed by the optical element. Here, color adjustment refers to adjusting the color of light.

[0017] In this specification, "light passing through an optical element (e.g., the first region or the second region)" refers to light emitted from a light-emitting portion entering the interior of the optical element and exiting the optical element either with or without wavelength conversion. In an optical element through which light passes, a region through which light emitted from a light-emitting portion is intentionally allowed to enter and exit the optical element is sometimes referred to as a "transmitting region." Furthermore, "light passing through an optical element (e.g., the first region or the second region)" refers to light emitted from the light-emitting portion passing through a through-hole provided in the optical element. In an optical element through which light passes, a region through which light emitted from the light-emitting portion is intentionally allowed to pass through the through-hole without being allowed to enter the optical element is sometimes referred to as a "passing region."

[0018] [First embodiment] (Example of overall configuration of light emitting module 100) The configuration of a light emitting module 100 according to the first embodiment will be described with reference to Figures 1 and 2. Figures 1 and 2 are diagrams showing an example of the configuration of the light emitting module 100, with Figure 1 being a top view and Figure 2 being a cross-sectional view taken along line II in Figure 1.

[0019] As shown in FIGS. 1 and 2, the light emitting module 100 includes a plurality of light emitting units 1, an optical member 2, a variable mechanism 3, and a first lens 4.

[0020] The light-emitting units 1 are aligned in a grid pattern along the X and Y directions and mounted on the surface on the +Z direction side (in other words, the upper surface) of the light-emitting unit mounting substrate 5. The light-emitting unit mounting substrate 5 is a plate-like member that is substantially rectangular in shape when viewed from above, and is a substrate equipped with wiring on which light-emitting elements and various electrical elements can be mounted.

[0021] A housing 6 is provided on the surface of the light-emitting unit mounting substrate 5 on the +Z direction side, and the plurality of light-emitting units 1, the filter 2 which is an optical member, the variable mechanism 3, and the first lens 4 are housed in this housing 6. The first lens 4 is arranged so that the convex portion of the first lens 4 is exposed on the +Z direction side through an opening 61 in the housing 6.

[0022] Each of the light-emitting units 1 has a substantially rectangular shape in top view. Each of the light-emitting units 1 has a light-emitting surface 11 and emits light toward a filter 2 provided on the +Z direction side of the light-emitting units 1.

[0023] The light-emitting surface 11 refers to the main light extraction surface of the light-emitting unit 1. An LED (Light Emitting Diode) or the like can be used as the light-emitting unit 1. The light emitted by the light-emitting unit 1 may be white light or monochromatic light, as will be described later. By selecting the light-emitting unit 1 according to the intended use of the light-emitting module 100, the wavelength and chromaticity of the light emitted by the light-emitting unit 1 can be appropriately selected.

[0024] The filter 2 includes a plurality of first regions 21 capable of extracting light of a first chromaticity and a second region 22 capable of extracting light of a second chromaticity different from the first chromaticity (see FIG. 2 ), and is an example of an optical member that transmits light emitted by the plurality of light-emitting units 1. The filter 2 is provided between the plurality of light-emitting units 1 and the first lens 4.

[0025] In this embodiment, the plurality of first regions 21 are provided so as to form pairs with the plurality of light-emitting units 1, respectively. However, this is not limited to this, and at least one of the first region 21 and the second region 22 may be provided so as to form pairs with the plurality of light-emitting units 1, respectively.

[0026] 2 , light emitted from each of the plurality of light-emitting units 1 passes through a pair of first regions 21 and then enters the first lens 4 provided on the +Z direction side of the filter 2. Most of the light emitted from each of the plurality of light-emitting units 1 does not enter the second region 22 of the filter 2 and therefore does not pass through the second region 22.

[0027] The variable mechanism 3 is a mechanism that changes the distance between the plurality of light-emitting units 1 and the filter 2. In this embodiment, the variable mechanism 3 changes the distance between the light-emitting units 1 and the filter 2 in the Z direction along the central axis 41 of the first lens 4, thereby changing the chromaticity of the light mixed by the filter 2. In the first lens 4 shown in FIG. 2 , the central axis 41 of the first lens 4 substantially coincides with the optical axis of the first lens 4.

[0028] The variable mechanism 3 includes a moving element 31, a spring 32, and a support 33. The moving element 31 is movable along the Z direction and is connected to the support 33 via the spring 32. The spring 32 has elasticity and can return the moving element 31 to its initial position in the Z direction.

[0029] The variable mechanism 3 includes a driving unit such as a voice coil motor that causes a moving element 31 including a coil to translate in a magnetic field created by a magnet, or an ultrasonic motor that converts natural vibrations generated in a metal elastic body into translational motion of the moving element 31 by frictional force. The variable mechanism 3 moves the moving element 31 in the Z direction by the driving force of the driving unit. However, the variable mechanism 3 is not limited to a configuration that includes a driving unit, and may have any configuration as long as it can change the distance between the plurality of light-emitting elements 1 and the filter 2 in a direction along the central axis 41 of the first lens 4. For example, the variable mechanism 3 may not include a driving unit, and may be configured so that a person manually changes the distance between the light-emitting element 1 and the filter 2 and then fixes the filter 2.

[0030] The mover 31 is a frame-shaped member that is substantially rectangular in top view. The filter 2 is fixed to the inside of the mover 31. The variable mechanism 3 moves the mover 31 along the Z axis to move the filter 2 along the Z direction, thereby changing the distance along the Z direction between each of the plurality of light-emitting units 1 and the filter 2.

[0031] 1 and 2 is a frame-shaped member having a substantially rectangular shape in top view, but is not limited thereto. The shape of the support 33 in top view can also be a substantially circular or polygonal shape, etc., to match the shape of the filter 2 in top view.

[0032] The first lens 4 is a lens onto which light emitted by each of the plurality of light-emitting units 1 and transmitted through the filter 2 is incident. In this embodiment, the light transmitted through the filter 2 is irradiated from the light exit surface side of the first lens 4 toward the +Z direction.

[0033] In this embodiment, the first lens 4 is a biconvex single lens including a first convex surface 42 that protrudes toward the plurality of light-emitting units 1 and a second convex surface 43 that protrudes away from the plurality of light-emitting units 1. The radius of curvature of the first convex surface 42 is larger than the radius of curvature of the second convex surface 43. The first lens 4 is formed to have a substantially circular shape when viewed from above. However, the first lens 4 is not limited to a biconvex single lens, and may be a concave lens, a meniscus lens, or a lens assembly composed of multiple lenses. The radius of curvature, lens thickness, and the like can also be changed as appropriate. The shape of the first lens 4 when viewed from above is not limited to a substantially circular shape, and may be a substantially polygonal shape such as a substantially elliptical, substantially triangular, or substantially rectangular shape.

[0034] The first lens 4 is translucent to the light emitted by the light-emitting unit 1, and is made of at least one of a resin material such as polycarbonate resin, acrylic resin, silicone resin, or epoxy resin, or a glass material. Note that the term "translucent" here refers to the property of being able to transmit 60% or more of the light from the light-emitting unit 1.

[0035] In this embodiment, when viewed from above, the position where the light-emitting unit 1 is located and the irradiation position where the light emitted by the light-emitting unit 1 is irradiated by the first lens 4 are in a positional relationship that is point-symmetric with respect to the central axis 41 of the first lens 4.

[0036] For example, as shown in FIG. 2 , light Ln emitted from a light-emitting unit 1n, which is located on the −X side of the central axis 41 among the multiple light-emitting units 1, is irradiated by a first lens 4 onto an irradiation position T, which is located on the +X side of the central axis 41 in an irradiation area S. The light-emitting unit 1n and the irradiation position T are point-symmetric, and in FIG. 2 , the distance from the light-emitting unit 1n to the central axis 41 and the distance from the irradiation position T to the central axis 41 are approximately equal in the X direction. Note that the irradiation area S may be a surface such as a screen or a wall, or may be a virtual plane in space. Furthermore, the distance from the light-emitting unit 1n to the central axis 41 and the distance from the irradiation position T to the central axis 41 do not have to be equal in the X direction.

[0037] The housing 6 has an opening 61 and a holding portion 62. The opening 61 is formed to have a substantially circular shape when viewed from above. The opening 61 is formed to be larger than the outer edge of the second convex surface 43 when viewed from above so that the second convex surface 43 of the first lens 4 is exposed. The surface of the holding portion 62 on the -Z direction side is fixed to the surface of the light-emitting portion mounting substrate 5 on the +Z direction side with an adhesive member or the like.

[0038] The housing 6 preferably has light-blocking properties. For example, it is preferably made of a resin material containing a filler such as a light-reflecting material or a light-absorbing material. This can suppress stray light and improve the contrast of the light emitted by the light-emitting module 100.

[0039] The shape of the housing 6 is not limited to the above, and the housing 6 may have a substantially circular, elliptical, or polygonal shape when viewed from above.

[0040] (Configuration Example of Light-Emitting Unit 1) The configuration of the plurality of light-emitting units 1 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a top view of the plurality of light-emitting units 1, and Fig. 4 is a cross-sectional view taken along line III-III in Fig. 3.

[0041] 3 and 4 , the plurality of light-emitting units 1 are arranged in the X and Y directions or in a grid pattern in a top view, and include 16 light-emitting units 1, namely, light-emitting units 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1m, 1n, 1o, 1p, and 1q. The X direction is an example of the horizontal direction, and the Y direction is an example of the vertical direction.

[0042] Light-emitting unit 1a includes light-emitting surface 11a, light-emitting unit 1b includes light-emitting surface 11b, light-emitting unit 1c includes light-emitting surface 11c, light-emitting unit 1d includes light-emitting surface 11d, light-emitting unit 1e includes light-emitting surface 11e, light-emitting unit 1f includes light-emitting surface 11f, and light-emitting unit 1g includes light-emitting surface 11g. Light-emitting unit 1h includes light-emitting surface 11h, light-emitting unit 1i includes light-emitting surface 11i, light-emitting unit 1j includes light-emitting surface 11j, light-emitting unit 1k includes light-emitting surface 11k, light-emitting unit 1m includes light-emitting surface 11m, light-emitting unit 1n includes light-emitting surface 11n, light-emitting unit 1p includes light-emitting surface 11p, and light-emitting unit 1q includes light-emitting surface 11q. Note that, because light-emitting unit 1 and light-emitting surface 11 overlap when viewed from above, the reference numerals for light-emitting unit 1 and light-emitting surface 11 are both shown in FIG. 3 .

[0043] It is preferable that light-emitting surfaces 11a to 11q are arranged so as to be inside the first lens 4 (inside the outer shape of the first lens 4) when viewed from above. This allows light emitted from light-emitting surface 11 to be efficiently incident on the first lens 4, thereby improving the light extraction efficiency of the first lens 4.

[0044] The distance d is the distance between the centers of adjacent light-emitting units 1 in the X direction when viewed from above. Note that the distance d may also be the distance between the centers of adjacent light-emitting units 1 in the Y direction when viewed from above.

[0045] 3 illustrates 16 light-emitting units 1 arranged vertically and horizontally or in a grid pattern, but the arrangement and number of light-emitting units 1 are not limited to this. At least two light-emitting units 1 are sufficient, and the arrangement and number of light-emitting units 1 can be changed as appropriate depending on the application of the light-emitting module 100, etc.

[0046] As shown in Figure 4, the light-emitting unit 1 has its surface on the +Z direction side as the light-emitting surface 11 and its surface opposite the light-emitting surface 11 as the mounting surface, and is placed so that the mounting surface faces the surface on the +Z direction side of the light-emitting unit mounting board 5.

[0047] The light-emitting unit 1 of this embodiment includes a light-emitting element 12, a translucent member 14 provided on the +Z direction side of the light-emitting element 12, and a covering member 15 that covers the side surfaces of the light-emitting element 12 and the translucent member 14 except for the surface on the +Z direction side of the translucent member 14.

[0048] The light-emitting surface 11 of the present embodiment is, for example, a quadrangle with a side of 100 μm to 1000 μm in top view. In the present embodiment, the shape of the light-emitting surface 11 in top view is substantially rectangular, but it may be a polygonal shape such as a substantially circular shape, a substantially elliptical shape, a substantially triangular shape, or a substantially hexagonal shape.

[0049] The light-emitting element 12 is a semiconductor element that emits light by itself when a voltage is applied. The light-emitting element 12 preferably includes at least a semiconductor laminate and has at least a pair of electrodes 13 with opposite polarities, for example, a p-side electrode and an n-side electrode, on the surface opposite the top surface of the light-emitting element 12. The light-emitting element 12 is, for example, a rectangle with a side of 50 μm to 1000 μm in top view. The area or length of one side of the light-emitting element 12 in top view may be different from the area or length of one side of the light-emitting surface 11 in top view.

[0050] The semiconductor laminate is preferably made of various semiconductors such as III-V group compound semiconductors and II-VI group compound semiconductors. The semiconductor material is preferably a nitride semiconductor. Nitride semiconductors are mainly made of a compound represented by the general formula In ｘ Al ｙ Ga １－ｘ－ｙ N (0≦x, 0≦y, x+y≦1), and is a material capable of emitting light of a short wavelength that can efficiently excite a wavelength conversion substance that may be contained in the light-transmitting member 14 described later. From the viewpoints of luminous efficiency, excitation of the wavelength conversion substance, and color mixing with the light emitted from the wavelength conversion substance, the emission peak wavelength of the light-emitting element 12 is preferably 400 nm or more and 530 nm or less, more preferably 420 nm or more and 490 nm or less, and even more preferably 450 nm or more and 475 nm or less. In addition, InAlGaAs-based semiconductors, InAlGaP-based semiconductors, etc. may also be used as the semiconductor material. In this embodiment, a light-emitting module 100 using a light-emitting element that emits blue light as the light-emitting element 12 will be described as an example.

[0051] The light-transmitting member 14 is a plate-like member having a substantially rectangular shape in top view, and is provided so as to cover the upper surface of the light-emitting element 12. The light-transmitting member 14 can be formed using a light-transmitting resin material or an inorganic material such as ceramics or glass. As the resin material, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, an epoxy-modified resin, or a phenolic resin can be used. In particular, a silicone resin or a modified resin thereof, which has excellent light resistance and heat resistance, is preferable. Note that the light-transmitting property here preferably means that 60% or more of the light from the light-emitting element 12 is transmitted.

[0052] Furthermore, the light-transmitting member 14 may be configured to include the above-mentioned resin, a light-diffusing material, or a wavelength-converting material. The wavelength-converting material absorbs at least a portion of the primary light emitted by the light-emitting element 12 and emits secondary light having a wavelength different from that of the primary light. Examples of the light-transmitting member 14 made of a resin and a wavelength-converting material include a resin material, ceramic, glass, or the like containing the wavelength-converting material, and a sintered body of the wavelength-converting material. Furthermore, the light-transmitting member 14 may have a resin layer containing a wavelength-converting material or a light-diffusing material on the −Z direction side of a molded body made of resin, ceramic, glass, or the like. Furthermore, a light-diffusing layer containing a resin, ceramic, glass, or the like may be provided on the light-transmitting member 14, continuing between adjacent light-emitting units 1.

[0053] The wavelength conversion material may be, for example, an yttrium aluminum garnet phosphor (e.g., Y ３ (Al, Ga) ５ O １２ :Ce), lutetium aluminum garnet phosphors (e.g., Lu ３ (Al, Ga) ５ O １２ :Ce), terbium aluminum garnet phosphors (e.g., Tb ３ (Al, Ga) ５ O １２ :Ce), CCA-based phosphors (e.g., Ca １０ (P.O. ４ ) ６ Cl ２ :Eu), SAE-based phosphors (e.g., Sr ４ Al １４ O ２５ :Eu), chlorosilicate phosphors (e.g., Ca ８ MgSi ４ O １６ Cl ２ :Eu), nitride-based phosphors, fluoride-based phosphors, phosphors having a perovskite structure (e.g., CsPb(F,Cl,Br,I) ３ ), quantum dot phosphors (e.g., CdSe, InP, AgInS ２ , AgInSe ２ , AgInGaS ２ or CuAgInS ２Examples of nitride-based phosphors include β-sialon-based phosphors (e.g., (Si, Al) ３ (O, N) ４ :Eu), α-sialon phosphors (e.g., Ca(Si,Al) １２ (O, N) １６ :Eu), SLA-based phosphors (e.g., SrLiAl ３ N ４ :Eu), CASN-based phosphors (e.g., CaAlSiN ３ :Eu) and SCASN-based phosphors (e.g., (Sr,Ca)AlSiN ３ :Eu), and an example of a fluoride-based phosphor is a KSF-based phosphor (e.g., K ２ SiF ６ :Mn), KSAF-based phosphors (e.g., K ２ (Si,Al)F ６ :Mn) and MGF-based phosphors (e.g., 3.5MgO.0.5MgF ２ GeO ２ The above-mentioned phosphors are in the form of particles. One of these wavelength conversion materials can be used alone, or two or more of these wavelength conversion materials can be used in combination.

[0054] The KSAF-based phosphor may have a composition represented by the following formula (I).

[0055] M ２ [Si ｐ Al ｑ Mn ｒ F ｓ ] (I)

[0056] In formula (I), M represents an alkali metal and may contain at least K. Mn may be a tetravalent Mn ion. p, q, r, and s may satisfy the following conditions: 0.9≦p+q+r≦1.1, 0<q≦0.1, 0<r≦0.2, 5.9≦s≦6.1. Preferably, 0.95≦p+q+r≦1.05 or 0.97≦p+q+r≦1.03, 0<q≦0.03, 0.002≦q≦0.02 or 0.003≦q≦0.015, 0.005≦r≦0.15, 0.01≦r≦0.12 or 0.015≦r≦0.1, 5.92≦s≦6.05, or 5.95≦s≦6.025. For example, K２ [Si ０．９４６ Al ０．００５ Mn ０．０４９ F ５．９９５ ], K ２ [Si ０．９４２ Al ０．００８ Mn ０．０５０ F ５．９９２ ], K ２ [Si ０．９３９ Al ０．０１４ Mn ０．０４７ F ５．９８６ Such a KSAF-based phosphor can provide red light emission with high brightness and a narrow half-width of the emission peak wavelength.

[0057] In this embodiment, the light-emitting unit 1 uses a blue light-emitting element as the light-emitting element 12, and emits white light by the transparent member 14 containing a wavelength conversion material that converts the wavelength of the light emitted from the light-emitting element 12 to yellow.

[0058] The light diffusing material contained in the light-transmitting member 14 may be, for example, titanium oxide, barium titanate, aluminum oxide, silicon oxide, or the like.

[0059] The covering member 15 is a member that covers the side surfaces of the light-emitting element 12 and the light-transmitting member 14, and directly or indirectly covers the side surfaces of the light-emitting element 12 and the light-transmitting member 14. The upper surface of the light-transmitting member 14 is exposed from the covering member 15 and forms the light-emitting surface 11 of the light-emitting unit 1. The covering member 15 may be spaced apart between adjacent light-emitting units 1.

[0060] The covering member 15 is preferably made of a material with high light reflectivity in order to improve light extraction efficiency. For example, the covering member 15 can be made of a resin material containing a light-reflecting substance such as a white pigment.

[0061] Examples of light-reflecting substances include titanium oxide, zinc oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, aluminum oxide, zirconium oxide, and silicon oxide. It is preferable to use one of these substances alone or two or more of these substances in combination.

[0062] Furthermore, the resin material is preferably a resin material whose main component is a thermosetting resin such as epoxy resin, epoxy-modified resin, silicone resin, silicone-modified resin, phenolic resin, etc. Note that the covering member 15 may be made of a material that is translucent to visible light, if necessary.

[0063] The light-emitting unit mounting substrate 5 is preferably configured to include wiring 51 arranged on at least one of the surface and the interior. In the light-emitting unit mounting substrate 5, the wiring 51 is connected to at least one pair of positive and negative electrodes 13 of the light-emitting unit 1 via a conductive adhesive member 52, thereby electrically connecting the light-emitting unit mounting substrate 5 and the light-emitting unit 1. The configuration, size, etc. of the wiring 51 of the light-emitting unit mounting substrate 5 are set according to the configuration and size of the electrodes 13 of the light-emitting unit 1.

[0064] The light-emitting unit mounting substrate 5 preferably uses an insulating material as a base material, and preferably uses a material that is difficult to transmit light emitted from the light-emitting unit 1 and external light, and preferably uses a material that has a certain strength. Specifically, the light-emitting unit mounting substrate 5 can be configured using ceramics such as alumina, aluminum nitride, mullite, and silicon nitride, or resins such as phenolic resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), and polyphthalamide as a base material.

[0065] The wiring 51 can be made of at least one of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, alloys of these, etc. Furthermore, a layer of silver, platinum, aluminum, rhodium, gold, alloys of these, etc. may be provided on the surface of the wiring 51 from the viewpoint of wettability and / or light reflectivity of the conductive adhesive member 52.

[0066] (Filter 2) The configuration of the filter 2 will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is a top view of the filter 2, and Fig. 6 is a cross-sectional view taken along the line VV in Fig. 5.

[0067] As shown in Figures 5 and 6, the filter 2 has a plurality of first regions 21 that pair with each light-emitting surface 11 of a plurality of light-emitting sections 1, and a second region 22 that is arranged around the first regions 21 in the filter 2 when viewed from above.

[0068] 2 are aligned in a grid pattern along both the X and Y directions. The filter 2 is fixed to the inside of the mover 31.

[0069] The filter 2 is a plate-like member made of a resin material such as silicone or a glass material. The first region 21 includes a transmissive portion that transmits the light emitted by the light-emitting unit 1. The transmissive portion of this embodiment does not include a wavelength conversion material, a color filter, or the like that converts the wavelength of the light emitted from the light-emitting unit 1. The second region 22 includes a color filter that transmits light of some wavelengths out of the light emitted by the light-emitting unit 1.

[0070] The first region 21 is translucent to the light emitted by the light-emitting unit 1, and transmits the light emitted by the light-emitting unit 1 with almost no absorption or almost no reflection. Translucency here refers to the property of transmitting 60% or more of the light from the light-emitting unit 1. In this embodiment, the light-emitting unit 1 emits white light, and therefore the first region 21 can extract white light. White is an example of the first chromaticity.

[0071] The light-emitting surface 11 is disposed inside the first region 21 in a top view. The region width p of the first region 21 along the X direction is equal to or greater than the light-emitting surface width q of the light-emitting surface 11 along the X direction. The region width p of the first region 21 along the Y direction is equal to or greater than the light-emitting surface width q of the light-emitting surface 11 along the Y direction. In the X and Y directions shown in FIG. 5 , the region width p of the first region 21 is substantially equal, and the light-emitting surface width q of the light-emitting surface 11 is also substantially equal. The inside of the first region 21 includes the boundary between the first region 21 and the second region 22. In other words, in a top view, the outer edge of the light-emitting surface 11 may almost completely overlap the outer edge of the first region 21. The region width p and the light-emitting surface width q may each be widths along the Y direction. Also, in FIG. 5 , the light-emitting surface 11 is shown in a top view of the filter 2 to illustrate the positional relationship between the light-emitting surface 11 and the first region 21. However, the light-emitting surface 11 is not a component included in the filter 2.

[0072] The second region 22 transmits a portion of the light emitted by the light-emitting unit 1 by absorbing or reflecting the portion. The color filter included in the second region 22 is a member that uses a resin such as silicone or glass as a base material, and contains a pigment substance made of an inorganic compound or an organic compound including a metal oxide or the like, or the wavelength conversion substance described above. The pigment substance is a member that absorbs at least a portion of the primary light emitted by the light-emitting unit 1 and transmits secondary light that has a portion of the wavelengths included in the primary light.

[0073] In this embodiment, the second region 22 extracts light of a chromaticity corresponding to amber as a portion of the light. Amber is an orange-based color, which is known as incandescent light. Amber is an example of the second chromaticity.

[0074] In this embodiment, the filter 2 has a substantially rectangular shape when viewed from above, but the shape is not limited to this and may be, for example, a substantially circular or polygonal shape when viewed from above. Furthermore, the filter 2 may not be a plate-shaped member, but may be, for example, a sheet-shaped member. The first region 21 and the second region 22 may also each have a substantially circular or polygonal shape when viewed from above.

[0075] (Example of Color Tuning in Light-Emitting Module 100) Color tuning in the light-emitting module 100 will be described with reference to Figs. 7 to 8B. Fig. 7 is a cross-sectional view illustrating the light-emitting module 100 after the filter 2 has been moved. This cross-sectional view is a cross-sectional view taken along the line II in Fig. 1, similar to Fig. 2, and differs from Fig. 2 only in that the view is taken after the filter 2 has been moved in the +Z direction. Figs. 8A and 8B are diagrams illustrating light passing through the filter 2, with Fig. 8A being Fig. 1 and Fig. 8B being Fig. 2.

[0076] 7, as a result of the movement of the slider 31 in the variable mechanism 3 in the +Z direction, the filter 2 moves in the +Z direction from the position of the filter 2 in Fig. 2 (the position of the dotted line U shown in Fig. 7) and stops there. From the viewpoint of reducing color unevenness, it is preferable that the variable mechanism 3 moves the filter 2 in the +Z direction while maintaining the filter 2 substantially parallel to the light-emitting surface 11 of the light-emitting unit 1.

[0077] 7, distance δ is the distance of relative movement between light-emitting unit 1 and filter 2 along central axis 41 of first lens 4. In Fig. 7, distance δ is the distance of relative movement of the surface on the -Z direction side of filter 2. Directivity half angle θ means the half-value angle of the spread angle of light emitted by light-emitting unit 1 and propagating while spreading in the +Z direction.

[0078] The movement of the filter 2 changes the positional relationship along the Z direction between the filter 2 and the light-emitting unit 1. As a result, part of the light emitted from the light-emitting unit 1 and propagating while spreading passes through the first region 21, and the other part passes through the second region 22 located around the first region 21 in a top view.

[0079] 8A , before the filter 2 moves, most of the white light emitted from the light-emitting unit 1 passes through the first region 21, and the color of the light emitted from the filter 2 is almost white. The white light La emitted from the filter 2 is an example of light of the first chromaticity.

[0080] 8B , after the filter 2 has moved in the +Z direction, the light emitted from the light-emitting unit 1 is more spread out at the position where it enters the filter 2, so that part of the light enters the first region 21 and part of the light enters the second region 22. The light that enters the first region 21 exits the filter 2 as white light La. On the other hand, the light that enters the second region 22 exits the filter 2 as amber light Lb. The amber light Lb is an example of light of the second chromaticity.

[0081] White light emitted from the light-emitting unit 1 passes through the first region 21 or the second region 22 of the filter 2 to become white light La and amber light Lb, and the ratio of the amounts of these lights is adjusted before being emitted from the filter 2. In other words, the filter 2 can extract light emitted by the multiple light-emitting units 1 that has passed through each of the first region 21 and the second region 22 and in which the amounts of light of different colors have been adjusted (in other words, mixed light). The mixed color light extracted by the filter 2 is irradiated in the +Z direction by the first lens 4.

[0082] The color of the mixed light is an intermediate color between white and amber. The chromaticity of the mixed light changes as the ratio between the amount of light transmitted through the first region 21 and the amount of light transmitted through the second region 22 changes depending on the position of the filter 2 in the Z direction. The light-emitting module 100 can adjust the color by changing the position of the filter 2 in the Z direction using the variable mechanism 3 to adjust the amount of light of different colors. At least one of the first region 21 or the second region 22 of the filter 2 may include a light-passing portion through which light passes, as described below.

[0083] <Operational Effects of Light-Emitting Module 100> The operational effects of the light-emitting module 100 will be described.

[0084] The light-emitting module 100 according to this embodiment has a plurality of light-emitting units 1. The light-emitting module 100 also has an optical member 2 (filter) that includes a first region 21 that can extract light of a first chromaticity (white light La) and a second region 22 that can extract light of a second chromaticity (amber light Lb), and that transmits light emitted by the plurality of light-emitting units 1. The light-emitting module 100 also has a variable mechanism 3 that changes the distance between the plurality of light-emitting units 1 and the filter 2, and a first lens 4 that irradiates light that has passed through the filter 2. The variable mechanism 3 changes the distance between the light-emitting units 1 and the filter 2 in a direction along a central axis 41 of the first lens 4.

[0085] The filter 2 is capable of extracting mixed light from the light emitted by the multiple light-emitting units 1 after passing through each of the first region 21 and the second region 22, and the variable mechanism 3 changes the chromaticity of the mixed light by changing the distance between the multiple light-emitting units 1 and the filter 2.

[0086] The color of the mixed light changes as the ratio between the amount of light that passes through the first region 21 and the amount of light that passes through the second region 22 changes depending on the position of the filter 2 in the Z direction. The light-emitting module 100 can adjust the color of the light emitted by the first lens 4 by changing the position of the filter 2 in the Z direction and adjusting the mixed color.

[0087] The light-emitting module 100 according to this embodiment does not require the preparation of a light-emitting module for white light and a light-emitting module for amber light, and then the mixing of the lights emitted by these modules to adjust the color, thereby enabling the overall light-emitting module to be miniaturized and costs to be reduced.Furthermore, there is no need to align the light from each of the two light-emitting modules emitting light of different chromaticities.

[0088] In this embodiment, by arbitrarily changing the position of the filter 2 in the Z direction, the color that is an intermediate color between white and amber can be arbitrarily changed, thereby providing an emitting module 100 that has a high degree of freedom in adjusting the color of light.

[0089] In the present embodiment, white is exemplified as the first chromaticity and amber as the second chromaticity, but the first chromaticity and the second chromaticity are not limited to white and amber, and can be selected appropriately depending on the application of the light-emitting module 100. The light-emitting module 100 can adjust the color between the line connecting the first chromaticity and the second chromaticity (in other words, an intermediate color between the first chromaticity and the second chromaticity) with a high degree of freedom in the CIE 1931 color system.

[0090] In the present embodiment, the filter 2 has a configuration including a plurality of first regions 21, but the present invention is not limited to this, and the filter 2 may have at least one first region 21. Furthermore, the filter 2 may have at least one first region 21 and a plurality of second regions 22.

[0091] The filter 2 may include a plurality of first regions 21 and a plurality of second regions 22. For example, as shown in FIG. 9A , in the filter 2, a plurality of second regions 22 surround a plurality of first regions 21, and adjacent second regions 22 are separated by a light-shielding member 23. The light-shielding member 23 is, for example, a resin containing a light-diffusing material such as titanium oxide, barium titanate, aluminum oxide, or silicon oxide, a resin containing a light-absorbing material such as graphite powder, or a metal. In this way, by independently providing a plurality of first regions 21 and a plurality of second regions 22 for each of the plurality of light-emitting units 1, it is possible to suppress light propagation between adjacent first regions 21 and second regions 22.

[0092] In the present embodiment, the configuration in which the light emitted by the light-emitting unit 1 passes through each of the first region 21 and the second region 22 of the filter 2 has been exemplified. However, the light emitted by the light-emitting unit 1 may pass through at least one of the first region 21 and the second region 22. The light passing through the configuration may be, for example, a through-hole formed in a region of the filter 2 corresponding to at least one of the first region 21 and the second region 22. FIG. 9B is a diagram showing an example of the configuration of a filter in which the first region 21 is a through-hole. Because the color of the light that passes through the through-hole does not change, the light-emitting module 100 can adjust the color by mixing the white light that passes through the through-hole with the amber light that passes through the region other than the through-hole.

[0093] Furthermore, in this embodiment, the plurality of light-emitting units 1 are arranged in a grid pattern, and the first region 21 is provided so as to form a pair with each of the plurality of light-emitting units 1. This configuration allows the light-emitting module 100 to be more compact than when both the first region 21 and the second region 22 are provided for each of the plurality of light-emitting units 1. Note that the region that forms a pair with each of the plurality of light-emitting units 1 is not limited to the first region 21, and the same effect can be obtained even if at least either the first region 21 or the second region 22 is provided.

[0094] In this embodiment, the position where the light emitting unit 1 is disposed in the top view and the irradiation position where the light emitted by the light emitting unit 1 is irradiated by the first lens 4 are in a positional relationship that is point-symmetric with respect to the central axis of the first lens 4. With this configuration, the light emitting module 100 can reduce vignetting of light by the first lens 4.

[0095] In addition, in the present embodiment, when viewed from above, the second region 22 is provided around the first region 21. With this configuration, the white light La transmitted through the first region 21 is mixed with the amber light Lb transmitted through the second region 22 located around it when viewed from above, and therefore the light-emitting module 100 can suppress color unevenness in the mixed light and obtain toned light with excellent uniformity.

[0096] In this embodiment, each of the light-emitting units 1 has a light-emitting surface 11 and is aligned at equal intervals along the X direction. The filter 2 has a plurality of first regions 21 that form pairs with the light-emitting surfaces 11 of the light-emitting units 1, and the light-emitting surfaces 11 are disposed inside the first regions 21 in a top view. The variable mechanism 3 changes the distance between the light-emitting unit 1 and the filter 2 by moving the light-emitting unit 1 and the filter 2 relative to each other along the central axis 41 of the first lens 4. The preferred distance δ resulting from the relative movement between the light-emitting unit 1 and the filter 2 １ is expressed by the relationship of the following equation (1) (see FIG. 7 for the distance δ and the directivity half angle θ, and FIG. 3 for the distance d).

[0097]

[0098] Here, FIG. 10A shows the distance d and the distance δ. １3 and 10A, the centers of adjacent light-emitting units 1a and 1b are spaced apart by a distance d along the X direction. The lower surface 2d of the filter 2 represents the surface on the -Z direction side of the filter 2 before movement, and the lower surface 2u of the filter represents the surface on the -Z direction side of the filter 2 after movement. In more detail, the distance δ １ is the distance between the light emitting surface 11 of the light emitting unit 1 and the bottom surface of the filter 2.

[0099] The distance δ between the light-emitting unit 1 and the filter 2 due to the relative movement between the light-emitting unit 1 and the filter 2 １ Since the relationship expressed by the above formula (1) ensures that the incident positions of light emitted from adjacent light-emitting units 1a and 1b on filter 2 do not overlap before and after the movement of filter 2, light-emitting module 100 can improve the contrast of the light emitted from adjacent light-emitting units 1a and 1b. This improves the contrast of the partially irradiated light, for example, when partial illumination is performed. Note that partial illumination refers to partially irradiating only a portion of the area that can be irradiated by light-emitting module 100, i.e., the area that is irradiated with light when all of the multiple light-emitting units 1 are illuminated, by emitting light from some of the multiple light-emitting units 1. Furthermore, contrast refers to the level of contrast, which is the difference in brightness between the area irradiated with light and the area not irradiated with light.

[0100] Another preferable distance δ due to relative movement between the light-emitting unit 1 and the filter 2 ２ may be expressed by the following equation (2) (see FIG. 5 for the light emitting surface width q of the light emitting surface 11). Here, FIG. 10B shows the relationship between the distance d and the distance δ. ２ 1 is a diagram illustrating the relationship between the half-angle of directivity θ and the region width p of the first region 21. ２ is the distance between the light emitting surface 11 of the light emitting unit 1 and the bottom surface of the filter 2.

[0101]

[0102] Relative movement distance δ ２is expressed by the relationship of the above formula (2), the light-emitting module 100 can increase the amount of light that transmits through the second region 22 to widen the range of toning, and make dark lines and dark areas in the irradiation region S less noticeable. Note that a dark line means a dark linear area in the irradiation region S, and a dark area means a dark two-dimensional area in the irradiation region S.

[0103] In the present embodiment, the first region 21 includes a transmissive portion. However, the first region 21 may include at least one of a color filter that transmits light of some wavelengths among the light emitted by the light-emitting unit 1, or a wavelength conversion material that converts the light emitted by the light-emitting unit 1 to light of some wavelengths. In addition, in the present embodiment, the second region 22 includes a color filter. However, the second region 22 may include at least one of a transmissive portion that transmits light emitted by the light-emitting unit 1, or a wavelength conversion material that converts the light emitted by the light-emitting unit 1 to light of a wavelength other than the some wavelengths. These configurations can also achieve the same effects as the light-emitting module 100.

[0104] Second Embodiment A light-emitting module 100a according to a second embodiment will be described. Note that the same names and symbols as those in the first embodiment indicate the same or similar components, and detailed descriptions will be omitted as appropriate. This also applies to the following embodiments and modifications.

[0105] FIG. 11 is a cross-sectional view illustrating the configuration of the light-emitting module 100a.

[0106] 11 , the light-emitting module 100a has a plurality of light-emitting units 10 and an optical member 2a. The light-emitting units 10 are mounted on the surface of the light-emitting unit mounting substrate 5 on the +Z direction side. The plurality of light-emitting units 10 are arranged in a grid pattern along the X and Y directions. In this embodiment, the light-emitting module 100a will be described as an example, using light-emitting elements that emit blue light as the light-emitting units 10 and wavelength conversion members as the optical members 2a.

[0107] Note that various light sources such as a xenon lamp can be used for the light-emitting unit 10 of the light-emitting module 100a. However, in order to efficiently excite the wavelength conversion substance contained in the wavelength conversion member 2a, a light-emitting element such as an LED that emits light of a short wavelength is preferred.

[0108] The wavelength conversion member 2a includes a first region 21a capable of extracting light of a first chromaticity and a second region 22a capable of extracting light of a second chromaticity different from the first chromaticity, and is an example of an optical member that transmits light emitted by multiple light-emitting units 10.

[0109] The wavelength conversion member 2a is provided on the +Z direction side of the plurality of light-emitting units 10 and is fixed to the inside of the movable element 31. The variable mechanism 3 moves the movable element 31 along the Z axis to move the wavelength conversion member 2a along the Z direction, thereby changing the distance along the Z direction between each of the plurality of light-emitting units 10 and the wavelength conversion member 2a.

[0110] In the present embodiment, the plurality of first regions 21a are provided so as to form pairs with the plurality of light-emitting units 10, respectively. However, this configuration is not limited thereto, and at least one of the first region 21a and the second region 22a may be provided so as to form pairs with the plurality of light-emitting units 10, respectively.

[0111] 11 , the light emitted from each of the plurality of light-emitting units 10 passes through the paired first regions 21 a and then enters the first lens 4 provided on the +Z direction side of the wavelength conversion member 2 a. On the other hand, most of the light emitted from each of the plurality of light-emitting units 10 does not enter the second region 22 a of the wavelength conversion member 2 a and therefore does not pass through the second region 22 a.

[0112] The first regions 21a are a plurality of regions formed in a substantially rectangular shape when viewed from above. The first regions 21a contain a wavelength conversion material that converts light emitted by the light-emitting unit 10 into light of a first wavelength. The first regions 21a can extract light of a first chromaticity, which is a mixture of the light of the first wavelength converted by the wavelength conversion material and the light emitted by the light-emitting unit 10. In this embodiment, the first regions 21a extract white light as the light of the first chromaticity.

[0113] The second region 22a is a region provided around the first region 21a in the wavelength conversion member 2a in a top view. The second region 22a contains a wavelength conversion material that converts the light emitted by the light-emitting unit 10 into light of a second wavelength. The second region 22a can extract light of a second chromaticity, which is a mixture of the light of the second wavelength converted by the wavelength conversion material and the light emitted by the light-emitting unit 10. In this embodiment, the second region 22a extracts amber light as the light of the second chromaticity.

[0114] The wavelength conversion material contained in each of the first region 21a and the second region 22a may be a material containing the above-mentioned wavelength conversion substance using a resin such as silicone, glass, ceramic, etc. as a base material, or may be a material in which the wavelength conversion substance is printed on the surface of a molded body such as glass, or may be a sintered body of the wavelength conversion substance.

[0115] 12 is a cross-sectional view illustrating the light-emitting module 100a after the wavelength conversion member 2a has moved. As the slider 31 of the variable mechanism 3 moves in the +Z direction, the wavelength conversion member 2a moves in the +Z direction from the position of the wavelength conversion member 2a in FIG. 11 and stops.

[0116] The movement of the wavelength conversion member 2a changes the positional relationship along the Z direction between the wavelength conversion member 2a and the light emitting unit 10. As a result, part of the light emitted from the light emitting unit 10 and propagating while spreading is transmitted through the first region 21a, and the other part is transmitted through the second region 22a.

[0117] In other words, the wavelength conversion member 2a can extract light in which the ratio of the light intensity of each of the lights of different colors that pass through the first region 21a and the second region 22a is adjusted, out of the light emitted by the plurality of light-emitting units 10. The light in which the amounts of the lights of different colors that are output from the wavelength conversion member 2a are adjusted (in other words, the mixed light) is irradiated in the +Z direction by the first lens 4.

[0118] The color of the mixed light is an intermediate color between white and amber. The chromaticity of the mixed light changes as the ratio between the amount of light transmitted through the first region 21a and the amount of light transmitted through the second region 22a changes depending on the position of the wavelength conversion member 2a in the Z direction. The light-emitting module 100a can adjust the color by changing the position of the wavelength conversion member 2a in the Z direction using the variable mechanism 3 to adjust the amount of light of different colors. At least one of the first region 21a and the second region 22a may include a passing portion.

[0119] In the present embodiment, white is used as the first chromaticity and amber is used as the second chromaticity, but the first chromaticity and the second chromaticity are not limited to white and amber and can be selected appropriately depending on the application of the light-emitting module 100a. The light-emitting module 100a can adjust the color between the line connecting the first chromaticity and the second chromaticity (in other words, an intermediate color between the first chromaticity and the second chromaticity) with a high degree of freedom in the CIE 1931 color system.

[0120] The light emitting module 100a has the same effects as the light emitting module 100 according to the first embodiment.

[0121] 13 is a cross-sectional view illustrating the configuration of an optical member 2b according to a modified example. The wavelength conversion member, which is the optical member 2b, includes a first region 21b that can extract light of a first chromaticity and a second region 22b that can extract light of a second chromaticity different from the first chromaticity.

[0122] The first regions 21b are arranged, for example, in a grid pattern along the X and Y directions, and are generally rectangular in shape when viewed from above. The second regions 22b are arranged around each of the first regions 21b when viewed from above. That is, the second regions 22b extend linearly along the X and Y directions and have intersections surrounded by four adjacent first regions 21b in the X and Y directions.

[0123] The base of the wavelength conversion member 2b is a translucent plate-like member made of a resin material such as polycarbonate or a glass material. A color conversion material such as paint, pigment, or color filter is applied to the surface of the wavelength conversion member 2b on the +Z direction side. The region to which the color conversion material is applied corresponds to the second region 22b. On the other hand, the region to which the color conversion material is not applied and where the base of the wavelength conversion member 2b is exposed corresponds to the first region 21b. The base of the wavelength conversion member 2b may contain a wavelength conversion substance that converts the wavelength of the light emitted by the light emitting unit 1.

[0124] The light emitting module 100a or the light emitting module 100 can adjust the mixed color and adjust the color by changing the position of the wavelength conversion member 2b in the Z direction using the variable mechanism 3. The effects of the light emitting module 100 and the light emitting module 100a that include the wavelength conversion member 2b are the same as those described above.

[0125] 14 is a cross-sectional view illustrating the configuration of a light-emitting module 100c according to a third embodiment. The light-emitting module 100c further includes a plurality of second lenses 7.

[0126] The second lenses 7 are provided between the filter 2 and the first lens 4 so as to form pairs with the light-emitting units 1, respectively. The second lenses 7 are aligned in a grid pattern along both the X and Y directions and overlap the light-emitting units 1 in top view. In this embodiment, the second lenses 7 are exemplified by TIR (Total Internal Reflection) lenses that have a total reflection portion on the light-emitting unit 1 side. The number of the second lenses 7, the diameter, curvature radius, shape, etc. of each lens can be selected appropriately depending on the application of the light-emitting module 100c.

[0127] Each of the multiple second lenses 7 is translucent to the light emitted by the light-emitting unit 1 and is made of at least one of a resin material such as polycarbonate resin, acrylic resin, silicone resin, silicone-modified resin, epoxy resin, and epoxy-modified resin, or a glass material. Here, translucency refers to the ability to transmit 60% or more of the light from the light-emitting unit 1. In this embodiment, the multiple second lenses 7 are formed integrally and continuously with adjacent second lenses 7 by injection molding a resin material. However, the multiple second lenses 7 may also be separated from one another. Furthermore, the method for manufacturing the second lenses 7 is not limited to injection molding of a resin material, and cutting of a resin or glass material may also be used.

[0128] The variable mechanism 3 moves the filter 2 and the plurality of second lenses 7 together in a direction along the central axis 41 of the first lens 4. Note that moving the plurality of second lenses 7 and the filter 2 together includes both moving the plurality of second lenses 7 and the filter 2 in a state where they are separated from each other, and moving the plurality of second lenses 7 and the filter 2 in a state where they are in contact with each other.

[0129] 15 is a cross-sectional view illustrating the light-emitting module 100c after the filter 2 and the plurality of second lenses 7 have moved together. As the slider 31 of the variable mechanism 3 moves in the +Z direction, the filter 2 moves in the +Z direction from the position of the filter 2 in FIG. 14 and stops there.

[0130] The movement of the filter 2 changes the positional relationship between the filter 2 and the light-emitting unit 1 along the Z direction. As a result, part of the light emitted from the light-emitting unit 1 and propagating while spreading is transmitted through the first region 21 including the transmission portion, and the other part is transmitted through the second region 22.

[0131] 16A and 16B are diagrams showing light passing through filter 2 and multiple second lenses 7, with Fig. 16A being Fig. 1 and Fig. 16B being Fig. 2. As shown in Fig. 16A , before filter 2 and multiple second lenses 7 move together, most of the white light emitted from light-emitting unit 1 enters first region 21, which includes a transmissive portion, and passes through first region 21, so that the light emitted from filter 2 becomes almost white light. Furthermore, the light emitted from filter 2 enters second lens 7, and after its divergence angle is reduced by second lens 7, it is emitted from second lens 7.

[0132] 16B , after filter 2 has moved in the +Z direction, the light emitted from light-emitting unit 1 is more spread at the position where it enters filter 2, so that part of the light enters first region 21 and part of the light enters second region 22. The light that entered first region 21 exits filter 2 as white light La. On the other hand, the light that entered second region 22 exits filter 2 as amber light Lb. The light that exits filter 2 also enters second lens 7, where its spread angle is reduced, and then exits from second lens 7.

[0133] The positional relationship between the filter 2 and the second lens 7 does not change before and after the filter 2 is moved. In other words, the variable mechanism 3 moves the filter 2 and the second lens 7 as a single unit, so the spread angle of the light that passes through or passes through the filter 2 and is emitted from the second lens 7 does not change much before and after the movement. After emitting from the second lens 7, the white light La and the amber light Lb mix and become mixed colors. The mixed color light is irradiated in the +Z direction by the first lens 4.

[0134] The color of the mixed light changes as the ratio between the amount of light that passes through the first region 21 and the amount of light that passes through the second region 22 changes depending on the positions of the filter 2 and the second lens 7 in the Z direction. The light-emitting module 100c can adjust the mixed color and tone the color by changing the positions of the filter 2 and the second lens 7 in the Z direction using the variable mechanism 3.

[0135] The light-emitting module 100c has the second lens 7 between the filter 2 and the first lens 4, thereby suppressing the spread of light transmitted through the filter 2 compared to when the second lens 7 is not provided. This prevents mixed-color light emitted from one second lens 7 from mixing with other mixed-color light, such as mixed-color light emitted from an adjacent second lens 7. As a result, the light-emitting module 100c can obtain toned light with reduced color unevenness. Other effects of the light-emitting module 100c are similar to those of the first embodiment.

[0136] In this embodiment, the filter 2 and the second lens 7 are moved integrally in the Z direction by the variable mechanism 3, but the present invention is not limited to this. For example, the second lens 7 may be movable in the Z direction independently of the filter 2 by a variable mechanism other than the variable mechanism 3.

[0137] In this embodiment, the light emitting module 100c includes the filter 2, but the light emitting module 100c may include a wavelength conversion member 2a or a wavelength conversion member 2b instead of the filter 2.

[0138] 18 is a cross-sectional view illustrating the configuration of a light-emitting module 100d according to a fourth embodiment. The light-emitting module 100d further includes a diffuser 8 and a first lens moving mechanism 9.

[0139] The diffusion plate 8 diffuses the light emitted from the light-emitting unit 1 and transmitted through or passing through the filter 2 and the second lens 7. The diffusion plate 8 is a light-transmitting plate-like member made of, for example, glass or resin. The surface of the diffusion plate 8 may be formed with irregularities having a width or height approximately equal to the wavelength of the light.

[0140] The first lens moving mechanism 9 is an example of a moving mechanism that moves the first lens 4 and the multiple light-emitting units 1 relatively along a direction intersecting the central axis 41 of the first lens 4. In this embodiment, the first lens moving mechanism 9 moves the first lens 4 and the multiple light-emitting units 1 relatively along the X direction, which is approximately perpendicular to the central axis 41. However, this is not limited to this, and the first lens moving mechanism 9 may move the first lens 4 and the multiple light-emitting units 1 relatively along the Y direction, or may move the first lens 4 and the multiple light-emitting units 1 relatively along both the X direction and the Y direction. In this embodiment, the direction intersecting the central axis 41 is preferably approximately perpendicular to the central axis 41 and is inclined within ±10° with respect to the central axis 41.

[0141] The first lens moving mechanism 9 includes a driving unit such as a voice coil motor or an ultrasonic motor. The first lens moving mechanism 9 has an opening that is substantially circular in top view at approximately the center. The first lens moving mechanism 9 can move the first lens 4 held inside the opening by driving the voice coil motor, ultrasonic motor, etc.

[0142] The light irradiated in the +Z direction by the first lens 4 passes through a transparent member 63 provided on the housing 6 facing the first lens 4, and is irradiated in the +Z direction of the light emitting module 100d.

[0143] The light-emitting module 100d can suppress color unevenness of the toned light by diffusing the light toned using the filter 2 with the diffuser 8 and reducing the directivity of the light. Furthermore, the light-emitting module 100d can change the irradiation direction and irradiation position of the toned light by moving the first lens 4 with the first lens moving mechanism 9. Other effects are the same as those of the light-emitting module 100.

[0144] Fifth Embodiment A light-emitting module 100e according to a fifth embodiment will be described with reference to Figures 19 and 20. Figures 19 and 20 are diagrams illustrating the configuration of a third lens 20 included in the light-emitting module 100e, with Figure 19 being a top view and Figure 20 being a cross-sectional view taken along line XIX-XIX in Figure 19. For ease of explanation, Figures 19 and 20 only show the components surrounding the filter 2.

[0145] The third lens 20 includes a plurality of light distribution sections 20a. In this embodiment, the third lens 20 is a substantially plate-shaped member, and is disposed so that the surface on the +Z direction side is in contact with the surface on the −Z direction side of the filter 2. However, the third lens 20 does not necessarily have to be in contact with the filter 2, and an air layer, adhesive, or the like may be present between the third lens 2 and the filter 2.

[0146] The light distribution units 20a are provided between the filter 2 and the plurality of light-emitting units 1 so as to overlap the plurality of light-emitting units 1 in a top view and to form pairs with each of the plurality of light-emitting units 1. Each of the plurality of light distribution units 20a determines the distribution of light from the paired light-emitting unit 1. The light distribution units 20a are provided on the −Z direction side of the third lens 20, and are, for example, Fresnel lens units in which a convex or concave lens shape is divided into concentric regions and whose cross section is saw-tooth shaped. In this embodiment, the third lens 20 is a substantially plate-shaped member, and includes the light distribution units 20a, which are Fresnel lens units, on the surface of the substantially plate-shaped member facing the light-emitting units 1.

[0147] The variable mechanism 3 holds the third lens 20 inside the movable element 31 in a top view, and moves the movable element 31 in a direction along the central axis 41 of the first lens 4, thereby integrally moving the filter 2 and the third lens 20 including the plurality of light distribution units 20a in a direction along the central axis 41 of the first lens 4. Note that FIG. 20 shows a state in which the filter 2 and the third lens 20 are closest to the plurality of light-emitting units 1. The shortest distance between the third lens 20 and the plurality of light-emitting units 1 is, for example, 50 μm or more and 200 μm or less. The variable mechanism 3 can move the filter 2 and the third lens 20 integrally in the +Z direction from the state shown in FIG. 20 .

[0148] The light emitted from each of the multiple light-emitting units 1 propagates in the +Z direction while spreading, and enters the paired light distribution unit 20a. Each of the multiple light distribution units 20a suppresses the spread of the incident light and converts it into light that is close to parallel light. The light emitted from each of the multiple light distribution units 20a is transmitted through or passes through the filter 2, and then emitted in the +Z direction.

[0149] The variable mechanism 3 moves the filter 2 and the third lens 20 together as a single unit, so that the spread angle of light that is incident on the third lens 20 and that is transmitted through or passes through the filter 2 remains almost unchanged before and after the movement.

[0150] The color of the mixed light changes as the ratio between the amount of light transmitted through or passing through the first region 21 and the amount of light transmitted through or passing through the second region 22 changes depending on the positions of the filter 2 and the third lens 20 in the Z direction. The light-emitting module 100e can adjust the mixed color and tone the color by changing the positions of the filter 2 and the third lens 20 in the Z direction using the variable mechanism 3.

[0151] The light-emitting module 100e has a third lens 20 including a light distribution section 20a between the filter 2 and the light-emitting section 1, which reduces the spread of light before it passes through or passes through the filter 2, compared to a case where the third lens 20 is not provided, thereby enabling light that is closer to parallel light to be obtained. This prevents the mixed-color light emitted from a predetermined region of the filter 2 from mixing with other mixed-color light, such as mixed-color light emitted from a region surrounding the predetermined region. As a result, the light-emitting module 100e can obtain toned light with reduced color unevenness. Other effects of the light-emitting module 100e are the same as those of the first embodiment.

[0152] Note that, in the present embodiment, a configuration has been exemplified in which the filter 2 and the third lens 20 are moved integrally in the Z direction by the variable mechanism 3, but the present invention is not limited to this. For example, the third lens 20 may be movable in the Z direction independently of the filter 2 by a variable mechanism separate from the variable mechanism 3. Furthermore, while the configuration has been exemplified in which the third lens 20 has a plurality of light distribution sections 20a on the surface opposite to the surface facing the filter 2, the third lens 20 may have a plurality of light distribution sections 20a on the surface facing the filter 2 (in other words, the surface on the +Z direction side of the third lens 20).

[0153] In this embodiment, the light emitting module 100e includes the filter 2, but the light emitting module 100e may include a wavelength conversion member 2a or a wavelength conversion member 2b instead of the filter 2.

[0154] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0155] The light-emitting module of the present invention can be suitably used for lighting, camera flashes, vehicle headlights, etc. However, the light-emitting module of the present invention is not limited to these uses.

[0156] Examples of aspects of the present disclosure are as follows. <Item 1> A light-emitting module including a plurality of light-emitting units, at least one first region capable of extracting light of a first chromaticity, and at least one second region capable of extracting light of a second chromaticity different from the first chromaticity, the light-emitting unit having an optical element that transmits or passes light emitted by the plurality of light-emitting units, a variable mechanism that changes the distance between the plurality of light-emitting units and the optical element, and a first lens onto which light transmitted through or passing through the optical element is incident, wherein at least one of the first region and the second region is provided to form a pair with each of the plurality of light-emitting units, and the variable mechanism changes the distance between the light-emitting units and the optical element in a direction along a central axis of the first lens. <Item 2> The light-emitting module according to <Item 1>, wherein the plurality of light-emitting units are arranged in a lattice pattern. <Item 3> The light-emitting module according to <Item 1> or <Item 2>, further including a movement mechanism that moves the first lens and the plurality of light-emitting units relatively in a direction intersecting the central axis of the first lens. <Item 4> The light-emitting module according to any one of <Item 1> to <Item 3>, wherein the optical member is capable of extracting light emitted by the plurality of light-emitting units, the ratio of the amount of light transmitted through or passing through the first region and the second region being adjusted, and the variable mechanism changes the chromaticity of the light, the ratio of the amount of light being adjusted, by changing the distance between the plurality of light-emitting units and the optical member. <Item 5> The light-emitting module according to any one of <Item 1> to <Item 4>, wherein a position at which the light-emitting units are arranged in a top view and an irradiation position at which the light emitted by the light-emitting units is irradiated by the first lens are positionally symmetrical with respect to a central axis of the first lens. <Item 6> The light-emitting module according to any one of <Item 1> to <Item 5>, further comprising: a plurality of second lenses provided between the optical member and the first lens, the second lenses overlapping the plurality of light-emitting units in a top view and pairing with each of the plurality of light-emitting units. <Item 7> The light emitting module according to <Item 6>, wherein the variable mechanism moves the optical member and the plurality of second lenses together in a direction along the central axis of the first lens.<Item 8> The light-emitting module according to any one of <Item 1> to <Item 7>, further comprising a third lens between the optical member and the plurality of light-emitting units, the third lens overlapping the plurality of light-emitting units in a top view, pairing with each of the plurality of light-emitting units, and including a plurality of light distribution units that determine the distribution of light from the plurality of light-emitting units. <Item 9> The light-emitting module according to <Item 8>, wherein the variable mechanism moves the optical member and the third lens including the plurality of light distribution units together in a direction along the central axis of the first lens. <Item 10> The light-emitting module according to any one of <Item 1> to <Item 9>, wherein the second region is provided around the first region in a top view. <Item 11> The light-emitting module according to any one of <Item 1> to <Item 10>, wherein the plurality of light-emitting units each have a light-emitting surface and are aligned at equal intervals along at least one of the vertical and horizontal directions, the optical member has a plurality of the first regions that form pairs with the light-emitting surfaces of the plurality of light-emitting units, the light-emitting surfaces are disposed inside the first regions in a top view, the variable mechanism changes the distance δ between the light-emitting units and the optical member by relatively moving the light-emitting units and the optical member along a central axis of the first lens, and the distance δ due to the relative movement between the light-emitting units and the optical member is expressed by the relationship in formula (1) or (2) above. <Item 12> The light-emitting module according to any one of <Item 1> to <Item 11>, wherein the optical member includes a plurality of the first regions and a plurality of the second regions. <Item 13> The light-emitting module according to any one of <Item 1> to <Item 12>, wherein the first region includes at least one of a transmissive section that transmits light emitted by the light-emitting section, a color filter that transmits light of a portion of the wavelengths of the light emitted by the light-emitting section, or a wavelength conversion material that converts the light emitted by the light-emitting section to light of the portion of the wavelengths, and the second region includes at least one of a transmissive section that transmits light emitted by the light-emitting section, a color filter that transmits light of a wavelength different from the portion of the wavelengths of the light emitted by the light-emitting section, or a wavelength conversion material that converts the light emitted by the light-emitting section to light of the other wavelength.

[0157] This application claims priority based on Japanese Patent Application No. 2022-054467 filed with the Japan Patent Office on March 29, 2022, and includes the entire contents of this Japanese patent application.

[0158] REFERENCE SIGNS LIST 1, 10 Light-emitting section 11 Light-emitting surface 12 Light-emitting element 13 Electrode 14 Light-transmitting member 15 Covering member 2 Filter 21 First region 22 Second region 3 Variable mechanism 31 Movement element 32 Spring 33 Support 4 First lens 41 Central axis 42 First convex surface 43 Second convex surface 5 Light-emitting section mounting board 51 Wiring 52 Conductive adhesive member 6 Housing 61 Opening 62 Holding section 7 Second lens 8 Diffuser 9 First lens moving mechanism 20 Third lens 20a Light distribution section 100 Light-emitting module d Distance La White light Lb Amber light p Region width q Light-emitting surface width S Irradiated region T Irradiated position δ, δ １ , δ ２ Distance θ Directional half angle

Claims

1. A plurality of light emitting units; an optical member including at least one first region capable of extracting light of a first chromaticity and at least one second region capable of extracting light of a second chromaticity different from the first chromaticity, the optical member transmitting or passing light emitted by the plurality of light-emitting portions; a variable mechanism that changes a distance between the plurality of light-emitting units and the optical member; a first lens onto which light transmitted through or passing through the optical member is incident, At least one of the first region and the second region is provided to be paired with each of the plurality of light-emitting units, The variable mechanism is a light-emitting module that changes the distance between the light-emitting unit and the optical member in a direction along a central axis of the first lens.

2. The light emitting module according to claim 1 , wherein the plurality of light emitting sections are arranged in a lattice pattern.

3. The light-emitting module according to claim 1 , further comprising a moving mechanism that relatively moves the first lens and the plurality of light-emitting units along a direction intersecting a central axis of the first lens.

4. The optical member is capable of extracting light emitted by the plurality of light-emitting portions, the ratio of the amount of light transmitted through or passing through each of the first region and the second region being adjusted, The light-emitting module according to claim 1 , wherein the variable mechanism changes a distance between the plurality of light-emitting sections and the optical member to change a chromaticity of the light having the ratio of the light amounts adjusted.

5. The light-emitting module according to claim 1 or 2, wherein the position at which the light-emitting unit is located when viewed from above and the irradiation position at which the light emitted by the light-emitting unit is irradiated by the first lens are in a point-symmetric positional relationship with respect to the central axis of the first lens.

6. The light emitting module according to claim 1 or 2, further comprising a plurality of second lenses disposed between the optical member and the first lens, the second lenses overlapping the plurality of light emitting units in a top view and pairing with each of the plurality of light emitting units.

7. The light emitting module according to claim 6 , wherein the variable mechanism moves the optical member and the second lenses together in a direction along a central axis of the first lens.

8. The light-emitting module according to claim 1 or 2, further comprising a third lens between the optical member and the plurality of light-emitting units, the third lens overlapping the plurality of light-emitting units in a top view, pairing with each of the plurality of light-emitting units, and including a plurality of light distribution units that determine the distribution of light from the plurality of light-emitting units.

9. The light emitting module according to claim 8 , wherein the variable mechanism moves the optical member and a third lens including the plurality of light distribution portions together in a direction along a central axis of the first lens.

10. The light emitting module according to claim 1 , wherein the second region is provided around the first region when viewed from above.

11. Each of the plurality of light emitting portions has a light emitting surface and is aligned at equal intervals along at least one of a vertical direction and a horizontal direction; the optical member has a plurality of first regions that are paired with the light emitting surfaces of the plurality of light emitting portions, the light emitting surface is disposed inside the first region in a top view, the variable mechanism changes a distance δ between the light-emitting unit and the optical member by relatively moving the light-emitting unit and the optical member along a central axis of the first lens; 3. The light-emitting module according to claim 1, wherein a distance .delta. caused by a relative movement between the light-emitting portion and the optical member is expressed by the relationship in the following formula (1) or (2). [0010] (d represents the distance between the centers of adjacent light-emitting portions in the vertical direction or the horizontal direction when viewed from above, and θ represents the half-angle of directivity of light emitted by the light-emitting portion.) [0025] (d represents the distance between the centers of adjacent light-emitting portions in a top view along either the vertical direction or the horizontal direction, p represents the width of the first region along each of the vertical direction and the horizontal direction in a top view, and θ represents the half-maximum angle of the light emitted by the light-emitting portion.)

12. The light emitting module according to claim 1 , wherein the optical member includes a plurality of the first regions and a plurality of the second regions.

13. the first region includes at least one of a transmissive portion that transmits the light emitted by the light emitting portion, a color filter that transmits light of a certain wavelength of the light emitted by the light emitting portion, or a wavelength conversion material that converts the light emitted by the light emitting portion into light of the certain wavelength, 3. The light emitting module according to claim 1, wherein the second region includes at least one of a transmissive portion that transmits light emitted by the light emitting portion, a color filter that transmits light of a wavelength other than the portion of the wavelength of the light emitted by the light emitting portion, or a wavelength conversion material that converts the light emitted by the light emitting portion to light of the other wavelength.

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