Light Emitting Module

Abstract

To provide a light emitting module which can improve light extraction efficiency.SOLUTION: A light emitting module comprises a light source part and a light guide member surrounding the light source part in a plane view, and including a first face and a second face at a side opposite to the first face. The light guide member includes a first hole part opened at the first face side, and a second hole part and a third hole part which are located inside the first hole part in a plane view, the second hole part and the third hole part are located while being aligned in a first direction, a depth of the first hole part from the first face is shallower than depths of the second hole part and the third hole part from the first face, and the longest length of the second hole part in the first direction is longer than the longest length of the second hole part in a second direction orthogonal to the first direction in a plane view.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE PRESENT EMBODIMENT An embodiment of the present invention relates to a light emitting module. [Background technology]

[0002] Light-emitting modules that combine a light-emitting element such as a light-emitting diode with a light-guiding member are widely used as planar light sources such as backlights for liquid crystal displays. For example, Patent Document 1 discloses a light-emitting module that includes a light source unit and a light-guiding member that includes a hole in which the light source unit is disposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-056369 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for a light-emitting module with a further improved light extraction efficiency. An object of an embodiment of the present invention is to provide a light-emitting module with an improved light extraction efficiency. [Means for solving the problem]

[0005] According to one aspect of the present invention, an optical module includes a light source unit and a light guiding member that surrounds the light source unit in a planar view and includes a first surface and a second surface opposite the first surface, the light guiding member includes a first hole portion that opens to the first surface side, and a second hole portion and a third hole portion that are located inside the first hole portion in a planar view, the second hole portion and the third hole portion are located side by side in a first direction, the depth of the first hole portion from the first surface is shallower than the depths of the second hole portion and the third hole portion from the first surface, and in a planar view, the longest length of the second hole portion in the first direction is longer than the longest length of the second hole portion in a second direction perpendicular to the first direction. Effect of the Invention

[0006] According to the light emitting module of the embodiment of the present invention, the light extraction efficiency can be improved. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a schematic plan view of a surface light source according to the present embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. [Figure 3A] FIG. 2 is a schematic cross-sectional view of a light source unit according to the embodiment. [Figure 3B] 11 is a schematic cross-sectional view of a modified example of the light source unit according to the embodiment. FIG. [Figure 4A] 2 is an enlarged view of a light guide member in a portion IVA in FIG. [Figure 4B] 4B is a schematic cross-sectional view of the light-guiding member taken along line IVB-IVB in FIG. 4A. [Diagram 5] FIG. 2 is a schematic cross-sectional view of a light adjusting member according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the embodiments will be described with reference to the drawings. Since each drawing is a schematic illustration of the embodiment, the scale, interval, or positional relationship of each member may be exaggerated, or some of the members may be omitted. In this specification, the direction of the Z-axis arrow is defined as the upward direction, and the direction opposite to the direction of the Z-axis arrow is defined as the downward direction. In addition, as a cross-sectional view, an end view showing only a cut surface may be shown.

[0009] In the following description, components having substantially the same functions are indicated by common reference symbols, and descriptions may be omitted. In addition, terms indicating a specific direction or position (for example, "upper", "lower", and other terms including these terms) may be used. However, these terms are merely used for the sake of clarity of the relative direction or position in the referenced drawings. As long as the relationship of the relative direction or position by terms such as "upper" and "lower" in the referenced drawings is the same, the arrangement in drawings other than this disclosure, actual products, etc. may not be the same as that in the referenced drawings. In this specification, "parallel" includes not only cases where two straight lines, sides, faces, etc. do not intersect even when extended, but also cases where the angle formed by the two straight lines, sides, faces, etc. is within a range of 10°. In this specification, the positional relationship expressed as "upper" includes cases where they are in contact and cases where they are not in contact but are located above.

[0010] [Embodiment] The light emitting module 100 and the surface light source 300 of the embodiment will be described with reference to Figs. 1 to 5. Fig. 1 is a drawing of the surface light source 300 as viewed from the light emitting surface side. As shown in Fig. 1, two directions parallel to the light emitting surface of the surface light source 300 and perpendicular to each other are defined as the X direction and the Y direction. A direction perpendicular to the X direction and the Y direction is defined as the Z direction. In this specification, a plane parallel to the X direction and the Y direction may be referred to as the XY plane. Also, a direction inclined from the X direction at an angle of 0° or more and less than 360° in the XY plane may be referred to as the lateral direction, and the Z direction may be referred to as the vertical direction.

[0011] The surface light source 300 includes a light emitting module 100 and a support member 200. The light emitting module 100 is disposed on the support member 200. The light emitting module 100 includes a light source unit 10 and a light guiding member 20. In a plan view, the light guiding member 20 surrounds the light source unit 10. The light guiding member 20 includes a first surface 201 and a second surface 202 opposite to the first surface 201. The light guiding member 20 includes a first hole portion 21 that opens on the first surface 201 side. The light guiding member 20 includes a second hole portion 22 and a third hole portion 23 that are located inside the first hole portion 21 in a plan view. The second hole portion 22 and the third hole portion 23 are positioned side by side in the first direction. The depth of the first hole portion 21 from the first surface 201 is shallower than the depth of the second hole portion 22 from the first surface 201. The depth of the first hole portion 21 from the first surface 201 is shallower than the depth of the third hole portion 23 from the first surface 201. In a plan view, the longest length of the second hole portion 22 in the first direction is longer than the longest length of the second hole portion 22 in a second direction perpendicular to the first direction. In this specification, the first hole portion 21, the second hole portion 22 and / or the third hole portion 23 may be referred to as hole portion 20R without distinction.

[0012] By including the hole 20R that opens on the first surface 201 side of the light guiding member 20, it becomes easy to increase the surface area of ​​the light guiding member 20. In this way, the light from the light source unit 10 that is incident on the light guiding member 20 can be easily extracted to the outside of the light guiding member 20. This improves the light extraction efficiency of the light emitting module 100.

[0013] Each element constituting the light emitting module 100 and the surface light source 300 will be described in detail below.

[0014] (Light source section 10) 1, the light emitting module 100 includes a plurality of light source units 10 including a first light source 10A, a second light source 10B, a third light source 10C, and a fourth light source 10D. The number of light source units 10 included in the light emitting module 100 may be one.

[0015] As shown in FIG. 3A, the light source unit 10 includes a light emitting element 11. The light emitting element 11 includes a semiconductor laminate. The semiconductor laminate includes, for example, a substrate such as sapphire or gallium nitride, an n-type semiconductor layer disposed on the substrate, a p-type semiconductor layer, and a light emitting layer sandwiched between the n-type semiconductor layer and the p-type semiconductor layer. The light emitting element 11 also includes an n-side electrode electrically connected to the n-type semiconductor layer, and a p-side electrode electrically connected to the p-type semiconductor layer. The n-side electrode and the p-side electrode form a part of the lower surface of the light emitting element 11. Furthermore, the light source unit 10 includes a pair of positive and negative electrodes 12. The pair of positive and negative electrodes 12 form a part of the lower surface of the light source unit 10. One of the pair of electrodes 12 is electrically connected to the p-side electrode, and the other is electrically connected to the n-side electrode. The light source unit 10 may not include the electrode 12. When the light source unit 10 does not include a pair of positive and negative electrodes 12, the n-side electrode and the p-side electrode of the light emitting element 11 form a part of the lower surface of the light source unit 10. Furthermore, the light source section 10 does not need to include a substrate of sapphire, gallium nitride, etc. This makes it easier to reduce the size of the light source section 10 in the vertical direction.

[0016] The structure of the light emitting layer may be a structure having a single active layer such as a double heterostructure or a single quantum well structure (SQW), or a structure having a group of active layers such as a multiple quantum well structure (MQW). The light emitting layer can emit visible light or ultraviolet light. The light emitting layer can emit visible light ranging from blue to red. Examples of semiconductor laminates including such a light emitting layer include In x Al y Ga 1-x-yN (0≦x, 0≦y, x+y≦1). The semiconductor laminate can include at least one light-emitting layer capable of emitting the above-mentioned light. For example, the semiconductor laminate may have a structure including one or more light-emitting layers between an n-type semiconductor layer and a p-type semiconductor layer, or may have a structure in which a structure including an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer in order is repeated multiple times. When the semiconductor laminate includes multiple light-emitting layers, the semiconductor laminate may include light-emitting layers having different emission peak wavelengths, or may include light-emitting layers having the same emission peak wavelength. The emission peak wavelength may vary by, for example, about several nm. The combination of such light-emitting layers can be appropriately selected. For example, when the semiconductor laminate includes two light-emitting layers, the light-emitting layers can be selected from combinations such as blue light and blue light, green light and green light, red light and red light, ultraviolet light and ultraviolet light, blue light and green light, blue light and red light, or green light and red light. The light-emitting layer may include multiple active layers having different emission peak wavelengths, or may include multiple active layers having the same emission peak wavelength.

[0017] The light source unit 10 shown in FIG. 3A includes one light-emitting element 11. Each of the light source units 10 of the first light source 10A, the second light source 10B, the third light source 10C, and the fourth light source 10D may include a plurality of light-emitting elements 11. The emission peak wavelengths of the plurality of light-emitting elements included in each light source unit 10 may be the same or different. For example, when each light source unit 10 includes two light-emitting elements, the emission peak wavelengths of the light-emitting elements can be selected from combinations such as blue light and green light, blue light and red light, ultraviolet light and blue light, ultraviolet light and green light, ultraviolet light and red light, or green light and red light. For example, when each light source unit 10 includes three light-emitting elements, the emission peak wavelengths of the light-emitting elements can be selected from combinations such as blue light and green light and red light, ultraviolet light and green light and red light, ultraviolet light and blue light and green light, ultraviolet light and blue light and red light, ultraviolet light and green light and red light.

[0018] 3A, the light source section 10 may further include a light-transmissive member 13 (hereinafter referred to as a light-source light-transmissive member). The light-source light-transmissive member 13 covers the upper surface and side surfaces of the light-emitting element 11. The light-source light-transmissive member 13 can protect the light-emitting element 11. The light-source light-transmissive member 13 may be disposed so as to expose at least a part of the upper surface of the light-emitting element 11. This makes it easier to reduce the size of the light source section 10 in the vertical direction.

[0019] For example, the light source translucent member 13 has translucency for the light emitted by the light emitting element 11. The light source translucent member 13 includes a translucent resin, and may further include a phosphor. As the translucent resin, for example, a silicone resin or an epoxy resin can be used. As the phosphor, an yttrium-aluminum-garnet phosphor (for example, (Y,Gd) 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 phosphors (e.g., Ca 10 (PO 4 ) 6 Cl 2 :Eu), SAE phosphors (e.g., Sr 4 Al 14 O 25 :Eu), chlorosilicate phosphors (e.g., Ca 8 MgSi 4 O 16 Cl 2 :Eu), silicate phosphors (e.g., (Ba,Sr,Ca,Mg) 2 SiO 4 :Eu), β-sialon phosphors (e.g., (Si,Al) 3 (O,N) 4 :Eu) or α-sialon phosphors (e.g., Ca(Si,Al) 12 (O,N)16 :Eu) and other oxynitride phosphors, LSN phosphors (e.g., (La,Y) 3 Si 6 N 11 :Ce), BSESN phosphors (e.g., (Ba,Sr) 2 Si 5 N 8 :Eu), SLA phosphors (e.g., SrLiAl 3 N 4 :Eu), CASN phosphors (e.g., CaAlSiN 3 :Eu) or SCASN phosphors (e.g., (Sr,Ca)AlSiN 3 :Eu) and other nitride phosphors, KSF phosphors (e.g., K 2 SiF 6 :Mn), KSAF phosphors (e.g., K 2 (Si 1-x Al x )F 6-x :Mn Here, x satisfies 0 < x < 1.) or MGF phosphors (e.g., 3.5MgO·0.5MgF 2 ·GeO 2 :Mn) and other fluoride phosphors, quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I) 3 Here, FA and MA represent formamidinium and methylammonium, respectively.), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se) 2 ) etc. can be used. As the phosphor added to the light source light-transmitting member 13, one type of phosphor may be used, or a plurality of types of phosphors may be used.

[0020] Also, the wavelength conversion sheet containing the phosphor described above may be disposed on the planar light source 300. The wavelength conversion sheet can be a planar light source that absorbs a part of the blue light from the light source unit 10, emits yellow light, green light and / or red light, and emits white light. For example, white light can be obtained by combining the light source unit 10 capable of emitting blue light with a wavelength conversion sheet containing a phosphor capable of emitting yellow light. Alternatively, the light source unit 10 capable of emitting blue light may be combined with a wavelength conversion sheet containing a red phosphor and a green phosphor. Also, the light source unit 10 capable of emitting blue light may be combined with a plurality of wavelength conversion sheets. As the plurality of wavelength conversion sheets, for example, a wavelength conversion sheet containing a phosphor capable of emitting red light and a wavelength conversion sheet containing a phosphor capable of emitting green light can be selected. Also, the light source unit 10 having the light emitting element 11 capable of emitting blue light and the light source transmissive member 13 containing a phosphor capable of emitting red light may be combined with a wavelength conversion sheet containing a phosphor capable of emitting green light.

[0021] As the phosphor capable of emitting yellow light used in the wavelength conversion sheet, for example, the above-mentioned yttrium-aluminum-garnet phosphor is preferably used. In addition, as the phosphor capable of emitting green light used in the wavelength conversion sheet, it is preferable to use quantum dots having a narrow half-width of the emission peak wavelength, for example, the above-mentioned perovskite structure quantum dots, III-V group quantum dots, or quantum dots having a chalcopyrite structure. In addition, as the phosphor capable of emitting red light used in the wavelength conversion sheet, it is preferable to use quantum dots having a narrow half-width of the emission peak wavelength, for example, the above-mentioned KSF phosphor, KSAF phosphor, III-V group quantum dots, or quantum dots having a chalcopyrite structure, similar to the phosphor capable of emitting green light.

[0022] The light source unit 10 may further include a covering member 14. The covering member 14 is disposed on the lower surface of the light emitting element 11. The covering member 14 is disposed so that the lower surfaces of the electrodes 12 of the light source unit 10 are exposed from the covering member 14. The covering member 14 is also disposed on the lower surface of the light source translucent member 13 that covers the side surface of the light emitting element 11.

[0023] The covering member 14 has reflectivity to the light emitted by the light emitting element 11. For example, a resin member containing a gas such as nitrogen or oxygen, or a resin member containing light scattering particles can be used for the covering member 14. For example, a thermoplastic resin such as an acrylic resin, a polycarbonate resin, a cyclic polyolefin resin, a polyethylene terephthalate resin, or a polyester resin, or a thermosetting resin such as an epoxy resin or a silicone resin can be used for the resin member of the covering member 14. For example, particles of titania, silica, alumina, zinc oxide, magnesium oxide, zirconia, yttria, calcium fluoride, magnesium fluoride, niobium pentoxide, barium titanate, tantalum pentoxide, barium sulfate, glass, or the like can be used for the light scattering particles of the covering member 14. The covering member 14 may contain both a gas and light scattering particles.

[0024] As shown in FIG. 3A, the light source unit 10 can include a light adjustment member 15 (hereinafter, referred to as a light source light adjustment member). The light source light adjustment member 15 constitutes at least a part of the upper surface of the light source unit 10. The light source light adjustment member 15 is disposed above the light emitting element 11. In a plan view, the light source light adjustment member 15 and the light emitting element 11 overlap, and the light source light adjustment member 15 is located above the light emitting element 11 at the overlapping portion. The light source light adjustment member 15 is disposed above the light source transmissive member 13, and adjusts the amount and emission direction of light emitted from the upper surface of the light source transmissive member 13. The light source light adjustment member 15 has reflectivity and transmissivity with respect to light emitted by the light emitting element 11. A part of the light emitted from the upper surface of the light source transmissive member 13 is reflected by the light source light adjustment member 15, and the other part is transmitted through the light source light adjustment member 15. The transmittance of the light source light adjustment member 15 with respect to the peak wavelength of the light emitting element 11 is, for example, preferably 1% to 50%, more preferably 3% to 30%. By including the light source light adjustment member 15 in the light source section 10, it is possible to prevent the area directly above the light source section 10 from becoming too bright. This reduces uneven brightness of the light emitting module 100.

[0025] The light source light adjustment member 15 can be made of, for example, a resin member containing light scattering particles. The resin member of the light source light adjustment member 15 can be made of the same material as the resin member of the covering member 14. The light scattering particles of the light source light adjustment member 15 can be made of the same material as the light scattering particles of the covering member 14. The light source light adjustment member 15 may also be, for example, a metal member such as aluminum or silver, or a dielectric multilayer film.

[0026] As shown in FIG. 3B, the light source unit 10 may not include the light source light adjustment member 15. In this way, the light source unit 10 can be more easily miniaturized in the vertical direction than when the light source unit 10 includes the light source light adjustment member 15 arranged on the upper side of the light emitting element 11. As another embodiment of the light source unit 10, the light source unit 10 may not include the covering member 14. For example, the lower surface of the light source unit may be formed by the lower surface of the light emitting element, the lower surfaces of the pair of electrodes 12, and the lower surface of the light source translucent member. As another embodiment of the light source unit 10, the light source unit 10 may be only the light emitting element 11 alone. As another embodiment of the light source unit 10, the light source unit 10 may not include the covering member 14 and the light source translucent member 13, and the light source light adjustment member 15 may be arranged on the upper surface of the light emitting element 11. As another embodiment of the light source unit 10, the light source unit 10 may not include the light source translucent member 13, and the light source light adjustment member 15 may be arranged on the upper surface of the light emitting element 11, and the covering member 14 may be arranged on the lower surface of the light emitting element 11.

[0027] The shape of the light source unit 10 in plan view is not particularly limited. The shape of the light source unit 10 in plan view may be, for example, a circle, a triangle, a rectangle, a hexagon, or an octagon. When the shape of the light source unit 10 in plan view is a rectangle, a pair of outer edges of the light source unit 10 may be parallel to the X direction or may be inclined with respect to the X direction. In this embodiment, a pair of outer edges of the light source unit 10 are inclined at 45° with respect to the X direction.

[0028] (Light guiding member 20) The light guide member 20 is a member having translucency for the light emitted by the light source unit 10. The transmittance of the light guide member 20 for the peak wavelength of the light source unit 10 is, for example, preferably 60% or more, more preferably 80% or more. As shown in FIG. 2, the light guide member 20 has a first surface 201 which is a light emitting surface of the light emitting module 100, and a second surface 202 located on the opposite side of the first surface 201. As shown in FIG. 1, the light guide member 20 continuously surrounds the light source unit 10 in a plan view. In this embodiment, the light guide member 20 has a storage section 20H penetrating from the first surface 201 to the second surface 202. The light source unit 10 is disposed in the storage section 20H of the light guide member 20. In this embodiment, the storage section 20H is circular in a plan view. The storage section 20H may be elliptical or polygonal, such as triangular, rectangular, hexagonal, or octagonal, in a plan view. Incidentally, the accommodating portion 20H may be a recess that is open only on the second surface 202 side of the light guiding member 20. When the accommodating portion 20H is a recess, the accommodating portion 20H has a bottom surface formed by the light guiding member 20. When the accommodating portion 20H is a recess, the light guiding member 20 includes a portion that covers an upper surface of the light source unit 10 and a portion that covers a side surface of the light source unit 10.

[0029] The number of light guide members 20 included in the light emitting module 100 may be one or more. In this embodiment, the light emitting module 100 includes a plurality of light guide members 20 including a first light guide section 20A, a second light guide section 20B, a third light guide section 20C, and a fourth light guide section 20D. As shown in FIG. 1, the first light guide section 20A and the second light guide section 20B are adjacent to each other in the X direction. The third light guide section 20C and the fourth light guide section 20D are adjacent to each other in the X direction. The first light guide section 20A and the third light guide section 20C are adjacent to each other in the Y direction. The second light guide section 20B and the fourth light guide section 20D are adjacent to each other in the Y direction. The first light source 10A is disposed in the housing section 20H of the first light guide section 20A. The second light source 10B is disposed in the housing section 20H of the second light guide section 20B. The third light source 10C is disposed in the housing portion 20H of the third light guiding portion 20C. The fourth light source 10D is disposed in the housing portion 20H of the fourth light guiding portion 20D.

[0030] The light guide member 20 is partitioned by partitioning grooves 20G. One area partitioned by the partitioning grooves 20G is the light emitting area 300A. In this embodiment, the first light guide section 20A, the second light guide section 20B, the third light guide section 20C, and the fourth light guide section 20D partitioned by the partitioning grooves 20G are different light emitting areas 300A. One light emitting area 300A can be a driving unit of local dimming. The number of light emitting areas 300A constituting the surface light source 300 is not particularly limited. For example, the surface light source 300 may include one light emitting area 300A, or the surface light source 300 may include multiple light emitting areas 300A. In addition, a surface light source device having a larger area may be formed by arranging multiple surface light sources 300. A member having reflectivity to light emitted by the light source section 10 may be arranged in the partitioning grooves 20G. This can improve the contrast ratio between the light emitting area in the light emitting state and the light emitting area in the non-light emitting state. In addition, in the light-emitting module, a member having reflectivity to the light emitted by the light source section 10 does not necessarily have to be disposed in the partitioning groove 20G.

[0031] In this embodiment, the light guide member 20 includes a lattice-shaped partition groove 20G including a first partition groove 21G extending in the Y direction and a second partition groove 22G extending in the X direction. The first partition groove 21G extending in the Y direction is between the first light guide section 20A and the second light guide section 20B. The second partition groove 22G extending in the X direction is between the first light guide section 20A and the third light guide section 20C. The partition groove 20G preferably penetrates from the first surface 201 to the second surface 202 of the light guide member 20. In this manner, the light guide member 20 can be divided into a plurality of parts, so that, for example, warping of the support member 200 caused by the difference in thermal expansion coefficient between the light guide member 20 and the support member 200 can be reduced. This can reduce cracks in the conductive member 80 described later. Moreover, the partitioning groove 20G may be a recess that is open only on the first surface 201 side of the light guiding member 20, or may be a recess that is open only on the second surface 202 side of the light guiding member 20. When the partitioning groove 20G is a recess, the partitioning groove 20G has a bottom surface formed by the light guiding member 20.

[0032] The light guide member 20 includes a first hole 21 that opens on the first surface 201 side. In this embodiment, the first hole 21 is a recess that opens only on the first surface 201 side, which is the upper surface of the light guide member 20. When the first surface 201 constitutes the lower surface of the light guide member 20, the first hole 21 may be a recess that opens only on the lower surface side of the light guide member 20. By including the first hole 21 in the light guide member 20, the surface area of ​​the light guide member 20 can be increased. In this way, the amount of light extracted from the surface of the light guide member 20 to the outside of the light guide member 20 can be increased. This can improve the light extraction efficiency of the light emitting module 100. In a plan view, the first hole 21 is preferably located away from the light source unit 10. In this way, it is possible to reduce the area directly above the light source unit 10 from becoming too bright.

[0033] The light guide member 20 may include one first hole portion 21 or may include multiple first holes 21. As shown in FIG. 1, it is preferable that the multiple first holes 21 surround the light source unit 10 in a plan view. In this way, the multiple first holes 21 make it easier to extract light traveling laterally from the light source unit 10 to the outside of the light guide member 20. In addition, in a plan view, the multiple first holes 21 surround the light source unit 10, so that a portion with high brightness and a portion with low brightness tend to be mixed in the vicinity of the first hole portion 21. As a result, in a plan view, it is possible to make the boundary between the brightness of the portion located inside the outer edge of the first hole portion 21 and the brightness of the portion located outside the outer edge of the first hole portion 21 less noticeable. In addition, in a plan view, one first hole portion 21 may surround the light source unit 10 without any breaks.

[0034] The shape of the first hole 21 in plan view is not particularly limited. As shown in FIG. 1 and FIG. 4A, the first hole 21 of this embodiment includes a linear portion. The first hole 21 includes a linear portion when viewed from above means that the width of the first hole 21 in the direction in which the first hole 21 extends includes a portion that is longer than the width of the first hole 21 in the direction perpendicular to the direction in which the first hole 21 extends. In this specification, the width of the first hole 21 includes the length of the second hole 22 and / or the third hole 23 located inside the first hole 21. In this specification, the linear shape also includes a straight line, a curved line, a bent line, and the like.

[0035] As shown in FIG. 4B, the light guide member 20 includes a second hole portion 22 that opens to the first surface 201 side. In this embodiment, the second hole portion 22 is a recess that opens only to the first surface 201 side of the light guide member 20. The second hole portion 22 may penetrate from the first surface 201 to the second surface 202 of the light guide member 20. As shown in FIG. 4A, the second hole portion 22 of the light guide member 20 is located inside the first hole portion 21 in a plan view. In this way, it is possible to reduce the portion inside the outer edge of the second hole portion 22 in a plan view from being too bright. Since the second hole portion 22 of the light guide member 20 is located inside the first hole portion 21 in a plan view, a part of the light traveling from the light source unit 10 toward the second hole portion 22 of the light guide member 20 is easily extracted from the surface of the light guide member 20 that defines the first hole portion 21 that continuously surrounds the second hole portion 22. This can reduce the amount of light extracted from the second hole 22, so that the portion inside the outer edge of the second hole 22 in plan view can be prevented from becoming too bright. When the light guide member 20 includes a plurality of first holes 21, the second hole 22 may be located inside at least one of the first holes 21. When the light guide member 20 includes a plurality of first holes 21, it is preferable that the second hole 22 is located inside all of the plurality of first holes 21. This makes it easier to increase the surface area of ​​the light guide member 20. This makes it easier to extract the light from the light source unit 10 that has entered the light guide member 20 to the outside of the light guide member 20.

[0036] The shape of the second hole portion 22 in plan view is not particularly limited. The second hole portion 22 in this embodiment is elliptical in plan view. The second hole portion 22 may be circular or polygonal, such as triangular, rectangular, hexagonal, or octagonal, in plan view. The shape of the second hole portion 22 in plan view may include a linear portion, similar to the first hole portion 21.

[0037] It is preferable that the depth D1 (hereinafter also referred to as the first depth) of the first hole 21 from the first surface 201 is shallower than the depth D2 (hereinafter also referred to as the second depth) of the second hole 22 from the first surface 201. Since the hole 20R having a deeper depth from the first surface 201 is easier to extract light from the light source unit 10, the luminance of the portion located between the outer edge of the first hole 21 and the outer edge of the second hole 22 tends to be lower than the luminance of the portion located inside the outer edge of the second hole 22 in a planar view. Moreover, the luminance of the portion located between the outer edge of the first hole 21 and the outer edge of the second hole 22 tends to be higher than the luminance of the portion outside the outer edge of the first hole 21 where the hole 20R is not located. The second hole 22 is located inside the first hole 21 in plan view, and the first depth D1 is shallower than the second depth D2, so that the luminance can be increased from the portion where the hole 20R is not located to the second hole 22 in plan view. This makes it possible to make the boundary between the luminance of the portion located inside the outer edge of the second hole 22 and the luminance of the portion located outside the outer edge of the second hole 22 less noticeable. In this specification, unless otherwise specified, the depth of each hole is the value when the distance from the first surface 201 to the surface of the light guiding member 20 that defines each hole is maximum in the vertical direction. For example, the depth D1 of the first hole 21 is the value when the distance from the first surface 201 to the surface of the light guiding member 20 that defines the first hole 21 is maximum in the vertical direction.

[0038] As shown in FIG. 4B, the light guide member 20 includes a third hole 23 that opens on the first surface 201 side. In this embodiment, the third hole 23 is a recess that opens only on the first surface 201 side of the light guide member 20. The third hole 23 may penetrate from the first surface 201 to the second surface 202 of the light guide member 20. As shown in FIG. 4A, the third hole 23 of the light guide member 20 is located inside the first hole 21 in a plan view. In this way, it is possible to reduce the portion inside the outer edge of the third hole 23 in a plan view from being too bright. In addition, when the light guide member 20 includes a plurality of first holes 21, it is sufficient that the third hole 23 is located inside at least one of the first holes 21. In the case where the light guide member 20 includes a plurality of first holes 21, it is preferable that the third hole 23 is located inside all of the plurality of first holes 21. In this way, it is easy to increase the surface area of ​​the light guide member 20.

[0039] The shape of the third hole 23 in plan view is not particularly limited, similar to the second hole 22. The third hole 23 in this embodiment is elliptical in plan view. The shape of the third hole 23 in plan view is preferably the same as the shape of the second hole 22 in plan view. In this way, the second hole 22 and the third hole 23 can be easily formed. For example, when the second hole 22 and the third hole 23 are formed by laser processing, the second hole 22 and the third hole 23 can be formed by the same laser output. In this specification, the same shape is allowed to vary within ±5 μm. Also, the same laser output includes an output range in which one laser output is within ±5% of the other laser output.

[0040] The depth D2 (second depth) of the second hole from the first surface is preferably 0.9 to 1.1 times the depth D3 (third depth) of the third hole from the first surface. This makes it easier to form the second hole 22 and the third hole 23. For example, when the second hole 22 and the third hole 23 are formed by laser processing, the second hole 22 and the third hole 23 can be formed with the same laser output.

[0041] 2, it is preferable that the third hole portion 23 and the light source portion 10 overlap in the horizontal direction. This makes it easier for light from the light source portion 10 to be extracted from the surface of the light-guiding member 20 that defines the third hole portion 23. Similarly, it is preferable that the second hole portion 22 and the light source portion 10 overlap in the horizontal direction.

[0042] The depth D1 (first depth) of the first hole 21 from the first surface 201 is preferably 0.01 times or more and 0.2 times or less than the depth D2 (second depth) of the second hole 22 from the first surface 201. When the first depth D1 is 0.01 times or more than the second depth D2, the surface area of ​​the light guide member 20 can be increased. In this way, the light from the light source unit 10 that is incident on the light guide member 20 can be easily extracted to the outside of the light guide member 20. When the first depth D1 is 0.2 times or less than the second depth D2, the light from the light source unit 10 can be easily spread in the lateral direction. In other words, when the first depth D1 is 0.2 times or less than the second depth D2, the amount of light extracted from the surface of the light guide member 20 that defines the first hole 21 can be easily reduced. When the light from the light source unit 10 is easily spread in the lateral direction, the luminance unevenness of the light emitting module 100 can be easily reduced. Similarly, the first depth D1 is preferably 0.01 to 0.2 times the third depth D3.

[0043] As shown in FIG. 4A, the second hole 22 and the third hole 23 are positioned side by side in the first direction. The longest length L12 of the second hole 22 in the first direction (hereinafter also referred to as the first second hole length) is preferably longer than the longest length L22 of the second hole 22 in the second direction perpendicular to the first direction (hereinafter also referred to as the second second hole length). In this way, a part of the light from the light source unit 10 emitted in a direction intersecting the first direction is more likely to hit the surface of the light guide member 20 that defines the second hole 22. This makes it possible to increase the amount of light extracted to the outside of the light guide member 20. In FIG. 4A, the first direction is the X direction, and the second direction is the Y direction.

[0044] The number of the second holes 22 located inside one first hole 21 may be one or more. The number of the third holes 23 located inside one first hole 21 may be one or more. In this embodiment, as shown in FIG. 4A, a plurality of second holes 22 and a plurality of third holes 23 are located inside one first hole 21. As shown in FIG. 4A, the second holes 22 and the third holes 23 are alternately arranged in the first direction, and the first hole 21 is located between the second holes 22 and the third holes 23. In this way, the second holes 22 and the third holes 23 that easily extract light from the light source unit 10 can be mixed. As a result, a portion with high brightness and a portion with low brightness tend to be mixed in the vicinity of the first hole 21, so that the boundary between the brightness of the portion located inside the outer edge of the first hole 21 and the brightness of the portion located outside the outer edge of the first hole 21 can be made less noticeable.

[0045] 4A, the longest length L13 of the third hole portion 23 in the first direction (hereinafter also referred to as the first third hole portion length) is preferably longer than the longest length L23 of the third hole portion 23 in the second direction (hereinafter also referred to as the second third hole portion length). This makes it easier for a part of the light from the light source unit 10 traveling in a direction intersecting the first direction to hit the surface of the light guide member 20 that defines the third hole portion 23. This makes it possible to increase the amount of light extracted to the outside of the light guide member 20 from the surface of the light guide member 20 that defines the third hole portion 23.

[0046] As shown in FIG. 1, in a plan view, a virtual line IL connecting the center of the light source unit 10 and the outer edge of the light guide member 20 intersects with the first direction. That is, in a plan view in which light from the light source unit 10 tends to travel in the lateral direction, the virtual line IL connecting the center of the light source unit 10 and the outer edge of the light guide member 20 intersects with the first direction in which the length of the second hole portion 22 becomes longer. In this way, the light traveling in the lateral direction from the light source unit 10 tends to hit the surface of the light guide member 20 that defines the second hole portion 22. This makes it possible to increase the amount of light extracted from the surface of the light guide member 20 that defines the second hole portion 22. In this specification, the center of the light source unit means the geometric center of gravity of the light source unit in a plan view. The virtual line IL is a line connecting the center of the light source unit and any point on the outer edge of the light guide member, and multiple lines can be drawn. In this embodiment, a virtual line can be drawn in the entire circumferential direction (0° to 360°) from the center of the light source unit. Moreover, the imaginary line IL is a line segment having two ends, the center of the light source unit 10 and a point on the outer edge of the light guide member 20.

[0047] In a plan view, the angle between a virtual line IL connecting the center of the light source unit and the outer edge of the light guiding member and the first direction is preferably 30° or more, and more preferably 60° or more. This makes it easier for light traveling in the lateral direction from the light source unit 10 to hit the surface of the light guiding member 20 that defines the second hole portion 22. In this specification, the angle between the virtual line IL and the first direction means an angle of 90° or less among the angles between the virtual line IL and the first direction.

[0048] In a plan view, it is preferable that a virtual line IL connecting the center of the light source unit and the outer edge of the light guiding member is perpendicular to the first direction. This makes it easier for light traveling in the lateral direction from the light source unit 10 to hit the surface of the light guiding member 20 that defines the second hole portion 22. This makes it possible to increase the amount of light extracted to the outside of the light guiding member 20 from the surface of the light guiding member 20 that defines the second hole portion 22.

[0049] In this specification, a point on the outer edge of first light guiding section 20A located on first surface 201 that is farthest from the center of first light source 10A is referred to as a first point P1, and a point on the outer edge of first light guiding section 20A located on first surface 201 that is closest to the center of first light source 10A is referred to as a second point P2. In this embodiment, first point P1 is located at a corner of first light guiding section 20A, and second point P2 is located at the center of each side of first light guiding section 20A. There may be one first point P1 and one second point P2, respectively.

[0050] As shown in FIG. 1, in a plan view, it is preferable that at least one of the first holes 21 is located on a virtual line segment connecting the center of the first light source 10A and the first point P1. In this way, the luminance unevenness of the light-emitting module is reduced. The first point P1, which is far from the first light source 10A, is likely to have lower luminance than the second point P2, which is closer to the first light source 10A. However, by locating the first holes 21 on the virtual line segment, it becomes easier to increase the amount of light extracted to the outside of the light-guiding member 20 in the vicinity of the first point P1. This reduces the difference between the luminance at the first point P1 and the luminance at the second point P2, thereby reducing the luminance unevenness of the light-emitting module.

[0051] It is preferable that a plurality of first holes 21 are located on a virtual line segment connecting the center of the first light source 10A and the first point P1. This makes it easy to adjust the brightness in the vicinity of the first point P1, and therefore makes it easier to reduce the brightness unevenness of the light-emitting module. It is preferable that the number of first holes 21 located on the virtual line segment connecting the center of the first light source 10A and the first point P1 is greater than the number of first holes 21 located on the virtual line segment connecting the center of the first light source 10A and the second point P2. This makes it easier to reduce the difference between the brightness at the first point P1 and the brightness at the second point P2. It is not necessary that the first holes 21 are located on the virtual line segment connecting the center of the first light source 10A and the second point P2.

[0052] As shown in FIG. 4A, it is preferable that the portion 21A where the depth of the first hole 21 from the first surface 201 is maximum is located between the second hole 22 and the third hole 23 in a plan view. In other words, it is preferable that the portion 21A where the depth of the first hole 21 from the first surface 201 is maximum is located in a region located between the second hole 22 and the third hole 23 in a plan view. This makes it easier to reduce the luminance unevenness of the light emitting module 100. Since the depth of the second hole 22 and the depth of the third hole 23 are deeper than the depth of the first hole 21, it is easy to extract light from the light source unit 10. By positioning the portion 21A where the depth of the first hole 21 from the first surface 201 is maximum between the second hole 22 and the third hole 23 in a plan view, it is possible to improve the luminance between the second hole 22 and the third hole 23 in a plan view. This makes it possible to reduce the difference in luminance between the inside of the outer edge of the second hole portion 22 and the inside of the outer edge of the third hole portion 23 in a plan view, and the luminance in the region between the second hole portion 22 and the third hole portion 23. This makes it easier to reduce luminance unevenness in the light-emitting module 100.

[0053] 4A, the longest length L12 (first-second hole length) of the second hole portion 22 in the first direction (X direction) is preferably longer than the shortest length L14 from the second hole portion 22 to the third hole portion 23 in the first direction (X direction). In this way, the second hole portion 22, which is deeper than the first hole portion 21, can be made larger. This can increase the amount of light extracted to the outside of the light guide member 20 from the surface of the light guide member 20 that defines the second hole portion 22.

[0054] As shown in FIG. 4A, in the second direction (Y direction), the longest length L21 of the first hole 21 at the position overlapping with the second hole 22 (hereinafter also referred to as the first hole length) is preferably longer than the longest length L24 of the first hole at a position between the second hole 22 and the third hole 23 and away from the second hole 22 and the third hole 23. The long first hole length L21 makes it easier to lengthen the distance from the outer edge of the second hole 22 to the outer edge of the first hole 21 in the second direction. This makes it easier to increase the amount of light extracted to the outside of the light guide member 20 from the surface of the light guide member 20 that is located between the outer edge of the second hole 22 and the outer edge of the first hole 21 in the second direction and defines the first hole 21. This makes it possible to reduce the difference in brightness between the inside of the outer edge of the second hole 22 and the part located between the outer edge of the second hole 22 and the outer edge of the first hole 21 in the second direction in a plan view. This makes it easier to reduce uneven brightness of the light emitting module 100.

[0055] As shown in FIG. 4B, the light guide member 20 preferably has a convex portion 212 (hereinafter also referred to as a first convex portion) extending upwardly located at a portion where the first hole portion 21 and the second hole portion 22 are connected. The surface of the first convex portion 212 is defined by a part of the surface of the light guide member 20 that defines the first hole portion 21 and a part of the surface of the light guide member 20 that defines the second hole portion 22. The light guide member 20 includes the first convex portion 212, which facilitates the adjustment of luminance. For example, the light from the light source unit 10 extracted from the light guide member 20 can be adjusted by changing the size or position of the first convex portion 212. In this embodiment, the first convex portion 212 is provided so as to continuously surround the second hole portion 22 in a plan view. In addition, the boundary between the first hole portion 21 and the second hole portion 22 in this embodiment is a point located at the top of the first convex portion 212 in a cross-sectional view. It is preferable that the uppermost point of the first convex portion 212 is located below the first surface 201. This makes it easier to miniaturize the light emitting module 100 in the vertical direction. As shown in Fig. 4B, it is preferable that the light guiding member 20 has a convex portion 213 (hereinafter also referred to as a second convex portion) extending upwardly located at a portion where the first hole portion 21 and the third hole portion 23 are connected. The light guiding member 20 including the second convex portion 213 makes it easier to adjust the brightness.

[0056] 4B, it is preferable that the portion 21A where the depth of the first hole 21 from the first surface 201 is maximum is located between the first protrusion 212 and the second protrusion 213 in the horizontal direction. In this way, the portion 21A where the depth of the first hole 21 is maximum is located between the second hole 22 and the third hole 23. This makes it possible to reduce the difference in luminance between the inside of the outer edge of the second hole 22 and the inside of the outer edge of the third hole 23 in a plan view, and the luminance in the region between the second hole 22 and the third hole 23.

[0057] The light guide member 20 may be made of the same material as the resin member of the covering member 14. Alternatively, the light guide member 20 may be made of glass or the like. The light guide member 20 may contain phosphors or light scattering particles.

[0058] The thickness of the light guide member 20 is preferably, for example, 150 μm or more and 800 μm or less. In this specification, unless otherwise specified, the thickness of each member is the value when the distance from the upper surface of each member to the lower surface of each member in the vertical direction is maximum. The light guide member 20 may be composed of a single layer in the vertical direction, or may be composed of a laminate of multiple layers. When the light guide member 20 is composed of a laminate, a light-transmitting adhesive may be disposed between each layer. Each layer of the laminate may use a different type of main material. The first depth D1 is preferably, for example, 1 μm or more and 30 μm or less. The second depth D2 and the third depth D3 are preferably, for example, 50 μm or more and 700 μm or less.

[0059] The shape and / or number of the holes 20R provided in the first light guiding section 20A may be the same as or different from the shape and / or number of the holes 20R provided in the second light guiding section 20B. For example, before forming the holes 20R in the light guiding member 20, the luminance unevenness of the first light guiding section 20A and the luminance unevenness of the second light guiding section 20B are confirmed. After confirming the luminance unevenness of the first light guiding section 20A and the luminance unevenness of the second light guiding section 20B, the holes 20R suitable for each of the first light guiding section 20A and the second light guiding section 20B are formed in the light guiding member 20. In this way, the luminance unevenness of the light emitting module 100 can be reduced. For example, if the luminance unevenness is suppressed to a desired range before forming the holes 20R in the light guiding member 20, the holes 20R do not need to be formed in the light guiding member 20. The luminance unevenness of the first light guiding section 20A and the luminance unevenness of the second light guiding section 20B can be checked, for example, by measuring the luminance with a two-dimensional color luminance meter (CA-2500 manufactured by Konica Minolta).

[0060] The method of forming the hole in the light guiding member 20 is not particularly limited. For example, the hole 20R can be formed in the light guiding member 20 by laser processing. The hole 20R opening on the first surface 201 side can be formed in the light guiding member 20 by heat due to laser irradiation. When the hole is formed in the light guiding member 20 by laser processing, a pulsed laser beam is preferable. By scanning the pulsed laser beam in the first direction, the second hole 22 and the third hole 23 positioned side by side in the first direction and having a deep depth can be easily formed. Note that the light guiding member including the hole 20R may be formed by a method such as injection molding, transfer molding, or compression molding using a mold or the like.

[0061] (Translucent member 30) As shown in FIG. 2, the light emitting module 100 includes a light-transmitting member 30. The light-transmitting member 30 is a member that is transmissive to the light emitted by the light source unit 10. The light-transmitting member 30 includes a first light-transmitting section 31 and a second light-transmitting section 32. In this embodiment, the first light-transmitting section 31 and the second light-transmitting section 32 are separate bodies. The first light-transmitting section 31 and the second light-transmitting section 32 may be integrally formed of the same material. The transmittance of each of the first light-transmitting section 31 and the second light-transmitting section 32 with respect to the peak wavelength of the light source unit 10 is, for example, preferably 60% or more, more preferably 80% or more. The light emitting module 100 does not necessarily need to include the light-transmitting member 30.

[0062] As shown in FIG. 2 , the first light transmitting section 31 is preferably in contact with a side surface of the light source section 10. In this way, light from the light source section 10 can easily enter the first light transmitting section 31. The first light transmitting section 31 is preferably in contact with the light guide member 20. In this way, light from the light source section 10 can easily enter the light guide member 20. In a case where the light emitting module 100 does not include a light transmissive member 30, the light guide member 20 may be in contact with a side surface of the light source section 10. In this way, light from the light source section 10 can easily enter the light guide member 20.

[0063] The first light transmitting section 31 is preferably arranged so as to expose at least a part of the upper surface of the light source section 10. In this way, the light emitting module 100 can be more easily miniaturized in the vertical direction than when the first light transmitting section 31 covers the entire upper surface of the light source section 10. The first light transmitting section 31 may be arranged so as to expose the entire upper surface of the light source section 10. The first light transmitting section 31 may cover the entire upper surface of the light source section 10. By the first light transmitting section 31 covering the entire upper surface of the light source section 10, the brightness in the area directly above the light source section 10 can be easily adjusted. For example, the brightness in the area directly above the light source section 10 can be adjusted by changing the thickness of the first light transmitting section 31 in the part covering the upper surface of the light source section 10. This makes it easier to adjust the brightness, and therefore makes it easier to reduce the brightness unevenness of the light emitting module 100. When the first light transmitting section 31 covers the upper surface of the light source section 10, the second light transmitting section 32 covers the upper surface of the light source section 10 via the first light transmitting section 31.

[0064] The first light transmitting section 31 may be composed of a single layer in the up-down direction, or may be composed of a laminate of multiple layers. The first light transmitting section 31 may contain phosphors and light scattering particles. When the first light transmitting section 31 is a laminate, each layer may or may not contain phosphors and / or light scattering particles. For example, the first light transmitting section 31 may be composed of a layer containing phosphors and a layer not containing phosphors. The material of the first light transmitting section 31 may be, for example, the same material as the resin member of the covering member 14.

[0065] The second light transmitting section 32 is located above the light source section 10. The second light transmitting section 32 is located above the first light transmitting section 31. The second light transmitting section 32 is preferably in contact with the upper surface of the light source section 10 and / or the upper surface of the first light transmitting section 31. This makes it easier to miniaturize the light emitting module 100 in the vertical direction.

[0066] The second light-transmitting portion 32 may be made of, for example, the same material as the resin material of the covering member 14. Alternatively, a sheet-shaped optical transparent adhesive (OCA) may be used as the second light-transmitting portion 32. The second light-transmitting portion 32 may contain phosphors or light-scattering particles.

[0067] (Light adjustment member 40) The light adjusting member 40 has reflectivity and translucency for the light emitted by the light source unit 10. A part of the light emitted from the light source unit 10 is reflected by the light adjusting member 40, and the other part is transmitted through the light adjusting member 40. The transmittance of the light adjusting member 40 for the peak wavelength of the light source unit 10 is lower than the transmittance of the light guide member 20 for the peak wavelength of the light source unit 10. For example, the transmittance of the light adjusting member 15 for the peak wavelength of the light source unit 10 is preferably 1% or more and 50% or less, and more preferably 3% or more and 30% or less. The light adjusting member 40 may be composed of a single layer or may be composed of a laminate of multiple layers.

[0068] The light adjustment member 40 is disposed above the light source unit 10. In a plan view, the light adjustment member 40 and the light source unit 10 overlap, and the light adjustment member 40 is located above the light source unit 10 at the overlapping portion. By positioning the light adjustment member 40 above the light source unit 10, it is possible to prevent the area directly above the light source unit 10 from becoming too bright.

[0069] The light adjustment member 40 is disposed above the first light transmitting portion 31. In a plan view, the light adjustment member 40 and the first light transmitting portion 31 overlap, and the light adjustment member 40 is located above the first light transmitting portion 31 at the overlapping portion. By positioning the light adjustment member 40 above the first light transmitting portion 31, it is possible to prevent the region directly above the first light transmitting portion 31 from becoming too bright.

[0070] The light adjustment member 40 is disposed above the second light transmitting portion 32. In a plan view, the light adjustment member 40 and the second light transmitting portion 32 overlap, and the light adjustment member 40 is located above the second light transmitting portion 32 at the overlapping portion. By positioning the light adjustment member 40 above the second light transmitting portion 32, it is possible to prevent the region directly above the second light transmitting portion 32 from becoming too bright.

[0071] As shown in FIG. 1, in a plan view, at least a part of the outer edge of the light adjustment member 40 is preferably located outside the outer edge of the storage section 20H. This can reduce the vicinity of the outer edge of the storage section 20H from becoming too bright. In a plan view, the entire outer edge of the light adjustment member 40 may be located outside the outer edge of the storage section 20H. This can further reduce the vicinity of the outer edge of the storage section 20H from becoming too bright. In addition, in a plan view, the entire outer edge of the light adjustment member 40 may be located inside the outer edge of the storage section 20H. In this way, the area of ​​the light-transmitting member 30 exposed from the light adjustment member 40 in a plan view is easily increased. This can increase the amount of light extracted from the light-transmitting member 30 to the outside of the light-transmitting member 30.

[0072] The light adjustment member 40 has a light adjustment through hole 40A. By having the light adjustment through hole 40A, the light adjustment member 40 can easily adjust the brightness in the area directly above the light adjustment member 40. For example, by changing the size and position of the light adjustment through hole 40A, the light from the light source unit 10 that is blocked by the light adjustment member 40 can be adjusted. This makes it easy to adjust the brightness in the area directly above the light adjustment member 40, making it easier to reduce brightness unevenness in the light emitting module 100. In a plan view, the light adjustment through hole 40A is located away from the outer edge of the light adjustment member 40.

[0073] The light adjustment through hole 40A of the light adjustment member 40 is preferably located away from the light source unit 10 in a plan view. In this way, it is possible to reduce the area directly above the light source unit 10 from becoming too bright. When the light adjustment member 40 has a plurality of light adjustment through holes 40A, it is preferable that all of the plurality of light adjustment through holes 40A are located away from the light source unit 10 in a plan view. In this way, it is possible to reduce the area directly above the light source unit 10 from becoming too bright. In addition, when the light adjustment member 40 has a plurality of light adjustment through holes 40A, at least one light adjustment through hole 40A of the light adjustment member 40 may overlap the light source unit 10 in a plan view.

[0074] The shape of the light adjustment through hole 40A in plan view is not particularly limited. As shown in FIG. 1, the shape of the light adjustment through hole 40A in plan view is a circle. The shape of the light adjustment through hole 40A in plan view may be an ellipse, or a polygon such as a triangle, a rectangle, a hexagon, or an octagon. The shape of the light adjustment through hole 40A in plan view may include a linear portion. In this specification, the linear portion also includes a straight line, a curved line, or a bent line. For example, the shape of the light adjustment through hole 40A in plan view may include a V-shaped or L-shaped portion extending in two directions.

[0075] In plan view, it is preferable that the light adjustment through hole 40A surrounds the light source unit 10. In this way, it is easy to adjust the brightness of the light emitting module 100 in the X direction and / or Y direction. In plan view, it is preferable that the light source unit 10 is surrounded by a plurality of light adjustment through holes 40A. In this way, it is easy to mix a high brightness part and a low brightness part in the vicinity of the light adjustment through hole 40A. This makes it possible to make the boundary between the brightness of the part located inside the outer edge of the light adjustment through hole 40A and the brightness of the part located outside the outer edge of the light adjustment through hole 40A less noticeable. In addition, in plan view, the light adjustment through hole 40A may surround the light source unit 10 without a break.

[0076] As shown in FIG. 1, in a plan view, the light adjusting member 40 preferably has a plurality of recesses 40C (hereinafter, referred to as light adjusting recesses) recessed in the lateral direction. The light adjusting recesses 40C are provided on the outer edge of the light adjusting member 40. The light adjusting member 40 has the light adjusting recesses 40C, which makes it easy to adjust the brightness around the light adjusting member 40. For example, the light from the light source unit 10 blocked by the light adjusting member 40 can be adjusted by changing the size and position of the light adjusting recesses 40C. This makes it easy to adjust the brightness around the light adjusting member 40, which makes it easy to reduce the brightness unevenness of the light emitting module 100. In addition, the light adjusting member 40 has a plurality of light adjusting recesses 40C, which makes it easy to mix a portion with high brightness and a portion with low brightness in the vicinity of the outer edge of the light adjusting member 40. This makes it possible to make the boundary between the brightness of the portion located inside the outer edge of the light adjusting member 40 and the brightness of the portion located outside the outer edge of the light adjusting member 40 less noticeable in the vicinity of the outer edge of the light adjusting member 40. The size of the light adjusting recesses 40C is not particularly limited. The maximum length of the light adjusting recess 40C in the X direction may be shorter than the maximum length of the light adjusting through hole 40A in the X direction. The maximum length of the light adjusting recess 40C in the Y direction may be shorter than the maximum length of the light adjusting through hole 40A in the Y direction.

[0077] The light adjusting member 40 can be composed of a resin member 41A (hereinafter referred to as a light adjusting resin member) and a reflector 41B (hereinafter referred to as a light adjusting reflector) included in the light adjusting resin member 41A. The material of the light adjusting resin member 41A can be the same as that of the resin member of the covering member 14. The material of the light adjusting reflector 41B can be the same as that of the light scattering particles of the covering member 14. A gas such as nitrogen or oxygen may be used as the light adjusting reflector 41B. The light adjusting member 40 may also contain both light scattering particles and a gas.

[0078] The refractive index of the light adjusting reflector 41B is preferably lower than that of the light adjusting resin member 41A. This makes it easier for a part of the light from the light source unit 10 that is incident on the light adjusting resin member 41A to be totally reflected at the interface between the light adjusting resin member 41A and the light adjusting reflector 41B. This reduces the amount of light that escapes above the light source unit 10, thereby reducing the amount of the area directly above the light source unit 10 that becomes too bright. In this specification, the refractive index refers to the refractive index at the peak wavelength of the light source unit 10.

[0079] When the refractive index of the light adjusting reflector 41B is lower than that of the light adjusting resin member 41A, it is preferable that the refractive index of the light adjusting resin member 41A is higher than that of the base material of the light guide member 20. In this way, it is easy to increase the refractive index difference between the light adjusting resin member 41A and the light adjusting reflector 41B. As a result, a part of the light traveling from the light adjusting resin member 41A to the light adjusting reflector 41B is easily totally reflected at the interface between the light adjusting resin member 41A and the light adjusting reflector 41B. This can reduce the amount of light that escapes above the light source unit 10, and therefore can reduce the area directly above the light source unit 10 from becoming too bright.

[0080] As shown in FIG. 5, it is preferable that the maximum length L1 of the light adjusting reflector 41B in the horizontal direction is longer than the maximum length L2 in the vertical direction in a cross-sectional view. In this way, the surface of the light adjusting reflector 41B facing the light source unit 10 can be made closer to a flat surface than when the light adjusting reflector 41B is spherical. As a result, when the light emitted from the light source unit 10 is reflected by a part of the light adjusting member 40 located around the light source unit 10 in a plan view, it is more likely to be reflected in a direction away from the light source unit 10. In other words, it is possible to reduce the light emitted from the light source unit 10 being reflected by a part of the light adjusting member 40 and returning to the light source unit 10. As a result, it is possible to reduce the absorption of the light emitted from the light source unit 10 by the light source unit 10, thereby improving the light extraction efficiency of the light emitting module 100. For example, when the light source transmissive member 13 of the light source unit 10 contains a phosphor, the light emitted from the light source unit 10 can be reduced from being reflected by the light adjusting member 40 and returning to the light source unit 10, thereby reducing the wavelength of the light from the light source unit 10 from being excessively converted by the phosphor contained in the light source transmissive member 13. The maximum length L1 of the light adjusting reflector 41B in the horizontal direction is not particularly limited. For example, the maximum length L1 of the light adjusting reflector 41B in the horizontal direction is at least twice the maximum length L2 of the light adjusting reflector 41B in the vertical direction.

[0081] (Support member 200) The support member 200 is a member on which the light emitting module 100 is disposed. The support member 200 supports the light source unit 10 and the light guide member 20. The light guide member 20 is disposed on the support member 200 with the second surface 202 facing the upper surface of the support member 200.

[0082] The support member 200 has a wiring board 50. The wiring board 50 has an insulating base material 51 and at least one wiring layer 52 arranged on at least one surface of the insulating base material 51. The insulating base material 51 may be a rigid board or a flexible board. In order to make the surface light source thinner, the insulating base material 51 is preferably a flexible board. The insulating base material 51 may be composed of a single layer in the vertical direction, or may be composed of a laminate of multiple layers. For example, the insulating base material 51 may be composed of a single-layer flexible board, or may be composed of a laminate of multiple rigid boards. For example, a resin such as polyimide can be used as the material of the insulating base material 51. The wiring layer 52 is a metal film, for example, a copper film.

[0083] The support member 200 further includes a first adhesive layer 61 disposed on the wiring board 50, a reflective member 70 disposed on the first adhesive layer 61, and a second adhesive layer 62 disposed on the reflective member 70.

[0084] The first adhesive layer 61 is disposed between the wiring board 50 and the reflective member 70, and bonds the wiring board 50 and the reflective member 70. The first adhesive layer 61 can be made of, for example, a resin member containing light scattering particles. For example, the same material as the resin member of the covering member 14 can be used as the resin member of the first adhesive layer 61. For example, the same material as the light scattering particles of the covering member 14 can be used as the light scattering particles of the first adhesive layer 61. For example, a sheet-shaped optical transparent pressure-sensitive adhesive can be used as the first adhesive layer 61.

[0085] The refractive index of the resin member of the first adhesive layer 61 is preferably lower than the refractive index of the resin member of the reflective member 70. In this way, a part of the light traveling from the reflective member 70 to the first adhesive layer 61 is more likely to be totally reflected at the interface between the reflective member 70 and the first adhesive layer 61. This makes it possible to reduce the amount of light that escapes downward from the light-emitting module 100, thereby improving the light extraction efficiency of the light-emitting module 100.

[0086] The reflecting member 70 is disposed below the light guide member 20, below the light source unit 10, below the light-transmitting member 30, and below the partition groove 20G. The reflecting member 70 has reflectivity to light emitted by the light source unit 10. The reflecting member 70 can be composed of a resin member and a reflector contained in the resin member. For example, the same material as the resin member of the covering member 14 can be used as the resin member of the reflecting member 70. The same material as the light scattering particles of the covering member 14 can be used as the material of the reflector of the reflecting member 70. A gas such as nitrogen or oxygen may be used as the reflector of the reflecting member 70. The reflecting member 70 may also contain both light scattering particles and gas as the reflector.

[0087] The refractive index of the reflector of the reflecting member 70 is preferably lower than the refractive index of the resin member of the reflecting member 70. In this way, a part of the light from the light source unit 10 that is incident on the reflecting member 70 is more likely to be totally reflected at the interface between the resin member of the reflecting member 70 and the reflector of the reflecting member 70. This reduces the amount of light that escapes downward from the reflecting member 70, thereby improving the light extraction efficiency of the light-emitting module 100.

[0088] When the refractive index of the reflector of the reflecting member 70 is lower than the refractive index of the resin member of the reflecting member 70, it is preferable that the refractive index of the resin member of the reflecting member 70 is higher than the refractive index of the base material of the light guide member 20. In this way, it becomes easier to increase the refractive index difference between the resin member of the reflecting member 70 and the reflector of the reflecting member 70. As a result, part of the light from the light source unit 10 that is incident on the reflecting member 70 is easily totally reflected at the interface between the resin member of the reflecting member 70 and the reflector of the reflecting member 70.

[0089] The second adhesive layer 62 is disposed between the reflecting member 70 and the second surface 202 of the light guide member 20, and bonds the reflecting member 70 and the light guide member 20. The light source unit 10 is disposed on the second adhesive layer 62 in the housing portion 20H of the light guide member 20. The second adhesive layer 62 can be formed of, for example, a resin member containing light scattering particles. For example, the same material as the resin member of the covering member 14 can be used as the resin member of the second adhesive layer 62. For example, the same material as the light scattering particles of the covering member 14 can be used as the light scattering particles of the second adhesive layer 62. For example, a sheet-shaped optical transparent pressure-sensitive adhesive can be used as the second adhesive layer 62.

[0090] The refractive index of the resin member of the second adhesive layer 62 is preferably lower than the refractive index of the base material of the light guide member 20. In this way, a part of the light traveling from the light guide member 20 to the second adhesive layer 62 is more likely to be totally reflected at the interface between the light guide member 20 and the second adhesive layer 62. This makes it possible to reduce the light that passes downward from the light emitting module 100, thereby improving the light extraction efficiency of the light emitting module 100. The refractive index of the resin member of the second adhesive layer 62 is preferably lower than the refractive index of the base material of the first translucent section 31. In this way, a part of the light traveling from the first translucent section 31 to the second adhesive layer 62 is more likely to be totally reflected at the interface between the first translucent section 31 and the second adhesive layer 62. This makes it possible to reduce the light that passes downward from the light emitting module 100, thereby improving the light extraction efficiency of the light emitting module 100.

[0091] The support member 200 further includes a conductive member 80. The conductive member 80 includes, for example, a resin and metal particles contained in the resin. For example, an epoxy resin or a phenol resin can be used as the resin of the conductive member 80. For example, copper or silver particles can be used as the metal particles.

[0092] The conductive member 80 has a connection portion 81 and a wiring portion 82. The connection portion 81 penetrates the second adhesive layer 62, the reflective member 70, the first adhesive layer 61, and the insulating base material 51 in the top-bottom direction. The wiring portion 82 is disposed on the surface of the wiring board 50 on which the wiring layer 52 is disposed, and is connected to the connection portion 81. The connection portion 81 and the wiring portion 82 can be integrally formed from the same material. A portion of the wiring portion 82 is connected to the wiring layer 52.

[0093] A pair of conductive members 80 are disposed apart from each other in correspondence with the pair of positive and negative electrodes 12 of the light source unit 10. A connection portion 81 of one conductive member 80 is connected to the positive electrode 12 below the light source unit 10, and a connection portion 81 of the other conductive member 80 is connected to the negative electrode 12 below the light source unit 10. The electrodes 12 of the light source unit 10 are electrically connected to the conductive members 80 and the wiring layer 52.

[0094] The support member 200 further includes an insulating layer 90. The insulating layer 90 is disposed on the lower surface of the wiring board 50, and covers the wiring layer 52. The insulating layer 90 may be made of a material such as an epoxy resin, a urethane resin, or an acrylic resin.

[0095] This specification includes the following embodiments. Item 1. A light source unit, a light guiding member that surrounds the light source unit in a plan view and includes a first surface and a second surface opposite to the first surface; the light guide member includes a first hole portion that opens to the first surface side, and a second hole portion and a third hole portion that are located inside the first hole portion in a plan view, The second hole portion and the third hole portion are positioned side by side in a first direction, a depth of the first hole from the first surface is shallower than a depth of the second hole and a depth of the third hole from the first surface; A light-emitting module, in which, in a plan view, a maximum length of the second hole portion in the first direction is longer than a maximum length of the second hole portion in a second direction perpendicular to the first direction. Item 2. The light emitting module according to item 1, wherein a portion of the first hole at a maximum depth from the first surface is located between the second hole and the third hole in a plan view. Item 3. The light emitting module according to item 1 or 2, wherein a maximum length of the second hole portion in the first direction is longer than a minimum length from the second hole portion to the third hole portion in the first direction. Item 4. The light-emitting module described in any one of items 1 to 3, wherein the longest length of the first hole portion at a position overlapping with the second hole portion in the second direction is longer than the longest length of the first hole portion at a position away from the second hole portion and the third hole portion and between the second hole portion and the third hole portion. Item 5. The light emitting module according to any one of items 1 to 4, wherein the depth of the second hole from the first surface is 0.9 to 1.1 times the depth of the third hole from the first surface. Item 6. The light emitting module according to any one of items 1 to 5, wherein the depth of the first hole from the first surface is 0.01 to 0.2 times the depth of the second hole from the first surface. Item 7. The light emitting module according to any one of items 1 to 6, wherein the light guiding member has a convex portion extending upwardly located at a portion where the first hole portion and the second hole portion are connected. Item 8. The light emitting module according to any one of items 1 to 7, wherein, in a plan view, a virtual line connecting a center of the light source unit and an outer edge of the light guiding member intersects with the first direction. Item 9. The light emitting module according to any one of items 1 to 8, wherein in a plan view, a virtual line connecting a center of the light source unit and an outer edge of the light guiding member is perpendicular to the first direction.

[0096] The above describes the embodiments of the present invention with reference to specific examples. However, the present invention is not limited to these specific examples. All forms that can be implemented by a person skilled in the art through appropriate design modifications based on the above-described embodiments of the present invention also belong to the scope of the present invention as long as they include the gist of the present invention. In addition, within the scope of the concept of the present invention, a person skilled in the art may come up with various modified examples and examples of modifications, and these modified examples and examples of modifications also belong to the scope of the present invention. [Explanation of symbols]

[0097] 10 Light source section 20 Light guide member 30 Translucent material 40 Light adjustment materials 50 Wiring board 61 1st adhesive layer 62 Second adhesive layer 70 Reflective material 80 Conductive material 90 Insulating layer 100 Light Emitting Module 200 Support member 300 Planar light source

Claims

1. A light source unit; a light guiding member surrounding the light source unit in a plan view and including a first surface and a second surface opposite to the first surface; a reflecting member disposed on the second surface side of the light guiding member; Equipped with the light guide member includes a first hole portion that opens to the first surface side, and a second hole portion and a third hole portion that are located inside the first hole portion in a plan view, The second hole portion and the third hole portion are positioned side by side in a first direction, a depth of the first hole from the first surface is shallower than depths of the second hole and the third hole from the first surface; A light-emitting module, in which, in a plan view, a longest length of the second hole portion in the first direction is longer than a longest length of the second hole portion in a second direction perpendicular to the first direction.

2. The light emitting module according to claim 1 , wherein a portion of the first hole where the depth from the first surface is greatest is located between the second hole and the third hole in a plan view.

3. 3 . The light emitting module according to claim 1 , wherein a maximum length of the second hole in the first direction is longer than a minimum length from the second hole to the third hole in the first direction.

4. The light-emitting module described in claim 1 or claim 2, wherein in the second direction, the longest length of the first hole portion at a position overlapping with the second hole portion is longer than the longest length of the first hole portion at a position away from the second hole portion and the third hole portion and between the second hole portion and the third hole portion.

5. 3 . The light emitting module according to claim 1 , wherein the depth of the second hole from the first surface is 0.9 to 1.1 times the depth of the third hole from the first surface.

6. 3 . The light emitting module according to claim 1 , wherein the depth of the first hole from the first surface is 0.01 to 0.2 times the depth of the second hole from the first surface.

7. The light emitting module according to claim 1 , wherein the light guide member has a protrusion extending upward at a portion where the first hole and the second hole are connected.

8. The light emitting module according to claim 1 , wherein in a plan view, a virtual line connecting a center of the light source unit and an arbitrary point on an outer edge of the light guiding member intersects with the first direction.

9. The light emitting module according to claim 1 , wherein in a plan view, a virtual line connecting a center of the light source unit and an arbitrary point on an outer edge of the light guiding member is perpendicular to the first direction.

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