Lighting device

Abstract

To provide a luminaire which prevents generation of a dark line, and which makes the luminance of a surface light source uniform.SOLUTION: A luminaire includes: a substrate 110; light sources 120 arranged at predetermined intervals on the substrate 110; a resin layer 130 arranged on the substrate 110 and the light sources 120; and a phosphor layer 140 arranged on the resin layer 130. The phosphor layer 140 includes: a first region 141 overlapping the light sources 120, and including a flat region; and a second region 143 extended in the edge direction of the substrate 110 from the edge of the first region 141, and including a curved surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This disclosure relates to a surface-emitting illumination device for improving light efficiency. [Background technology]

[0002] Generally, light-emitting elements, such as light-emitting diodes (LEDs), are used in conjunction with existing light sources such as fluorescent lamps and incandescent lamps. In comparison, it has advantages such as low power consumption, virtually permanent lifespan, fast response speed, safety, and environmental friendliness. Such light-emitting diodes are used in various displays, indoor lights, and outdoor lights. It is applied to the device.

[0003] Recently, lamps employing light-emitting elements have been proposed as light sources for vehicles. In comparison, light-emitting elements have an advantage in that they consume less power. Light-emitting elements are size Because it is small, it allows for greater design freedom in the lamp, and its semi-permanent lifespan There is also the possibility of salvation.

[0004] Such vehicle lighting devices utilize surface light source lighting devices, and this enables the vehicle It gives the lamp a three-dimensional feel and a unique aesthetic.

[0005] Conventionally, surface light source illumination devices consist of a polyhedron whose top and sides are bent, The corner region between the surface and the side is very far from the light-emitting element, so the light from the light-emitting element does not reach it. Time is required, which results in the appearance of dark lines in the corner regions. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] This disclosure aims to provide a lighting device for preventing the occurrence of dark lines. .

[0007] Furthermore, this disclosure aims to provide a lighting device for making the brightness of a surface light source uniform. ru. [Means for solving the problem]

[0008] The lighting device according to this disclosure comprises a substrate and N light sources arranged on the substrate at predetermined intervals. The substrate and the light source are arranged on top of the resin layer and a fluorescent The substrate includes a body layer, and the phosphor layer is perpendicular to the substrate and some of the N light sources. - A first region including a flat area and a side of the first region of the substrate It includes a second region that extends in the direction and includes a curved surface, the second region being the side surface of the resin layer and the first A first point on the curved surface, horizontally opposite to the substrate from the center of the adjacent first light source, The system includes two points and a third point opposite to a straight line perpendicular to the substrate from the center of the first light source, The second distance from the center of the first light source to the second point is the distance from the center of the first light source to the second point. The third distance is greater than the first distance to point 1, and is the distance from the center of the first light source to point 3. It may be formed in a smaller size.

[0009] The first distance may be 44% to 55% of the distance between the light sources. The distance can be 5.5 mm to 6.5 mm. Radius of curvature of the curved surface in the second region The sum of the thickness of the resin layer in the vertical direction of the substrate and the thickness of the first region of the phosphor layer is It may be formed to be larger or the same size. The radius of curvature of the curved surface of the second region is the same as that of the substrate. 100% to 11% of the sum of the thickness of the resin layer in the vertical direction and the thickness of the first region of the phosphor layer It may be 0%. The sum of the thickness of the resin layer in the vertical direction of the substrate and the thickness of the first region of the phosphor layer can be 5.5 mm to 6.0 mm. The sum of the thickness of the resin layer in the vertical direction of the substrate and the thickness of the first region of the phosphor layer can be 5.5 mm to 6.0 mm.

[0010] The N light sources can be arranged in columns and further include M light sources arranged in rows. The phosphor layer is located at the boundary between the first region and the second region, and includes a fourth point which is a point on the outer surface of the phosphor layer, and a seventh point where the outer surface of the substrate and the second region face each other. The substrate includes a fifth point of the substrate which is the shortest distance from the fourth point to the upper surface of the substrate. The fifth point of the substrate is larger than the distance from the seventh point to the first light source which is the closest to the first point, and smaller than or the same as the radius of curvature of the curved surface region and may be arranged within the same region. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate. The third region includes a sixth point that touches or faces the substrate. The distance from the center of the first light source to the sixth point may be formed larger than the first distance. The height of the third region with reference to the upper surface of the substrate may be formed smaller than the height of the light source. The first point, the second point, and the third point may be the outer surface of the second region of the phosphor layer. The phosphor layer is located at the boundary between the first region and the second region, and includes a fourth point which is a point on the outer surface of the phosphor layer, and a seventh point where the outer surface of the substrate and the second region face each other. The substrate includes a fifth point of the substrate which is the shortest distance from the fourth point to the upper surface of the substrate. The fifth point of the substrate is larger than the distance from the seventh point to the first light source which is the closest to the first point, and smaller than or the same as the radius of curvature of the curved surface region and may be arranged within the same region. The phosphor layer is located at the boundary between the first region and the second region, and includes a fourth point which is a point on the outer surface of the phosphor layer, and a seventh point where the outer surface of the substrate and the second region face each other. The substrate includes a fifth point of the substrate which is the shortest distance from the fourth point to the upper surface of the substrate. The fifth point of the substrate is larger than the distance from the seventh point to the first light source which is the closest to the first point, and smaller than or the same as the radius of curvature of the curved surface region and may be arranged within the same region. The phosphor layer is located at the boundary between the first region and the second region, and includes a fourth point which is a point on the outer surface of the phosphor layer, and a seventh point where the outer surface of the substrate and the second region face each other. The substrate includes a fifth point of the substrate which is the shortest distance from the fourth point to the upper surface of the substrate. The fifth point of the substrate is larger than the distance from the seventh point to the first light source which is the closest to the first point, and smaller than or the same as the radius of curvature of the curved surface region and may be arranged within the same region. The phosphor layer is located at the boundary between the first region and the second region, and includes a fourth point which is a point on the outer surface of the phosphor layer, and a seventh point where the outer surface of the substrate and the second region face each other. The substrate includes a fifth point of the substrate which is the shortest distance from the fourth point to the upper surface of the substrate. The fifth point of the substrate is larger than the distance from the seventh point to the first light source which is the closest to the first point, and smaller than or the same as the radius of curvature of the curved surface region and may be arranged within the same region. The phosphor layer is located at the boundary between the first region and the second region, and includes a fourth point which is a point on the outer surface of the phosphor layer, and a seventh point where the outer surface of the substrate and the second region face each other. The substrate includes a fifth point of the substrate which is the shortest distance from the fourth point to the upper surface of the substrate. The fifth point of the substrate is larger than the distance from the seventh point to the first light source which is the closest to the first point, and smaller than or the same as the radius of curvature of the curved surface region and may be arranged within the same region. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate. The third region includes a sixth point that touches or faces the substrate. The distance from the center of the first light source to the sixth point may be formed larger than the first distance. The height of the third region with reference to the upper surface of the substrate may be formed smaller than the height of the light source. The first point, the second point, and the third point may be the outer surface of the second region of the phosphor layer. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate. The third region includes a sixth point that touches or faces the substrate. The distance from the center of the first light source to the sixth point may be formed larger than the first distance. The height of the third region with reference to the upper surface of the substrate may be formed smaller than the height of the light source. The first point, the second point, and the third point may be the outer surface of the second region of the phosphor layer. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate. The third region includes a sixth point that touches or faces the substrate. The distance from the center of the first light source to the sixth point may be formed larger than the first distance. The height of the third region with reference to the upper surface of the substrate may be formed smaller than the height of the light source. The first point, the second point, and the third point may be the outer surface of the second region of the phosphor layer. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate. The third region includes a sixth point that touches or faces the substrate. The distance from the center of the first light source to the sixth point may be formed larger than the first distance. The height of the third region with reference to the upper surface of the substrate may be formed smaller than the height of the light source. The first point, the second point, and the third point may be the outer surface of the second region of the phosphor layer. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate. The third region includes a sixth point that touches or faces the substrate. The distance from the center of the first light source to the sixth point may be formed larger than the first distance. The height of the third region with reference to the upper surface of the substrate may be formed smaller than the height of the light source. The first point, the second point, and the third point may be the outer surface of the second region of the phosphor layer.

[0011] Also, the lighting device according to the present disclosure includes a substrate, N light sources arranged at a predetermined interval on the substrate, a resin layer arranged on the substrate and the light sources, and a phosphor layer arranged on the resin layer. The phosphor layer includes a flat region that overlaps with a part of the N light sources in a direction perpendicular to the substrate, and a curved surface region adjacent to the flat region. Also, the lighting device according to the present disclosure includes a substrate, N light sources arranged at a predetermined interval on the substrate, a resin layer arranged on the substrate and the light sources, and a phosphor layer arranged on the resin layer. The phosphor layer includes a flat region that overlaps with a part of the N light sources in a direction perpendicular to the substrate, and a curved surface region adjacent to the flat region. Also, the lighting device according to the present disclosure includes a substrate, N light sources arranged at a predetermined interval on the substrate, a resin layer arranged on the substrate and the light sources, and a phosphor layer arranged on the resin layer. The phosphor layer includes a flat region that overlaps with a part of the N light sources in a direction perpendicular to the substrate, and a curved surface region adjacent to the flat region. Also, the lighting device according to the present disclosure includes a substrate, N light sources arranged at a predetermined interval on the substrate, a resin layer arranged on the substrate and the light sources, and a phosphor layer arranged on the resin layer. The phosphor layer includes a flat region that overlaps with a part of the N light sources in a direction perpendicular to the substrate, and a curved surface region adjacent to the flat region. Including, the phosphor layer has a seventh point where the phosphor layer and the substrate are in contact or facing each other, the fluorescent The optical layer includes a fourth point where the curved region and the flat region are in contact with or opposite each other, The substrate includes a fifth point on the substrate which is the shortest distance from the fourth point to the upper surface of the substrate, The fifth point on the substrate is the first light source that is closest to the seventh point. The distance is greater than the distance to the curved surface region, and smaller than the radius of curvature of the curved surface region, or it is located within the same region. It is also used for placement.

[0012] The fourth point is located on the outer surface of the phosphor layer, and the seventh point is located on the phosphor layer and The resin layer may be placed on the inner surface of the phosphor layer that is in contact with or facing it. The thickness of the flat region of the layer may correspond to the thickness of the curved region.

[0013] Furthermore, the lighting device relating to this disclosure comprises a substrate and a luminaire arranged on the substrate at predetermined intervals. Multiple light sources, a resin layer disposed on the substrate and the light sources, and disposed on the resin layer The resin layer includes a phosphor layer, and the resin layer has a first side surface, a second side surface and the first side surface and the second side Including the corner region that contacts the surface, the resin layer is on the first side in the region facing the upper surface of the substrate. The eighth point where the surface and the corner region are in contact, and the region facing the upper surface of the substrate, and the front of the second side surface. The resin includes a 9th point where the angle region makes contact and a 10th point which is the outer surface of the angle region. The distance from the center of the first light source closest to the corner region of the layer to the tenth point on the outer surface of the corner region. It is formed to be the same as the distance from the center of the first light source to the eighth and ninth points. That's fine.

[0014] The region where the first side surface and the upper surface of the substrate are in contact may include straight lines. The outer surface of the region is the 11th point, which is the shortest distance from the center of the first light source in a direction perpendicular to the substrate. The straight-line distance from the center of the first light source to the 11th point is the same as the center of the first light source. The phosphor layer may be formed to be larger than the distance from the 10th point. It can include a 'k'. [Effects of the Invention]

[0015] This disclosure relates to forming the side surface of the phosphor layer so that it has a curved surface, and the upper surface of the phosphor layer This prevents the occurrence of dark lines at the interface between the sides.

[0016] Furthermore, this disclosure shows how to change the distance between the side surface of the phosphor layer and the center of the light source, This has the effect of improving the uniformity of brightness.

[0017] Furthermore, this disclosure further forms a plane having a straight line on the side surface of the phosphor layer This has the effect of further improving the brightness of the light emitted from the side. [Brief explanation of the drawing]

[0018] [Figure 1] Figure 1 is a perspective view showing a lighting device according to the first embodiment. [Figure 2] Figure 2 is a perspective view illustrating the arrangement structure of light sources mounted on a substrate in the lighting device shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view taken along line A-A in Figure 1. [Figure 4] Figure 4 is a magnified view of a portion of Figure 3. [Figure 5] Figure 5 is a perspective view showing the lighting device in Figure 1 with the phosphor layer removed. [Figure 6] Figure 6 is a plan view illustrating the relationship between the light source and the resin layer in the lighting device shown in Figure 5, depending on the distance between them. [Figure 7] Figure 7 is a cross-sectional view taken along line B-B of the lighting device shown in Figure 6. [Figure 8] Figure 8 is a cross-sectional view showing a lighting device according to the second embodiment. [Modes for carrying out the invention]

[0019] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The technical concept is not limited to the specific embodiments described, but can be expressed in a variety of mutually different forms. It can be realized, and within the scope of the technical concept of the present invention, among the components of each embodiment It can be used by selectively combining or substituting one or more of them. Unless explicitly stated otherwise, the terms used (including technical and scientific terms) refer to the present invention. It can be interpreted as meaning that is generally understandable to someone with ordinary knowledge in that technical field. Terms that are commonly used, like dictionary definitions, have meaning in the context of their relevance. It will be possible to interpret its meaning by taking it into consideration. Also, the use used in the embodiments of the present invention The terms used are for illustrative purposes only and are not intended to limit the invention.

[0020] In this specification, the singular form may also include the plural form unless otherwise specified, and "A and If it says "(and) at least one of B and C (or one or more)", then A, B, and C are paired together. It may include one or more of all possible combinations. In describing the components of the embodiment, terms such as 1st, 2nd, A, B, (a), (b) are used. It is possible to do so, but such terminology is used to distinguish one component from another. There is no such thing as a term that limits the nature, order, or sequence of the constituent elements in question. And when one component is "connected," "joined," or "linked" to another component... If described, that component is not directly connected, joined, or linked to any other component. Not only in the case of being, but also in the case of other components between that component and other components This can also include cases where the elements are "linked," "joined," or "connected" by each element. When it is stated that an element is formed or positioned "above or below", above or below means two This applies not only when the components are in direct contact, but also when one or more other components are in contact with the two components. This also includes cases where elements are formed or positioned between other elements. Furthermore, when expressed as "above or below," Based on a single component, it can include meanings not only in the upward direction but also in the downward direction. .

[0021] Figure 1 is a perspective view showing the lighting device according to the first embodiment, and Figure 2 shows the device mounted on a substrate. Figure 3 is a perspective view illustrating the arrangement structure of the light source, and Figure 1 is a cross-sectional view along the line A-A. Figure 4 is a magnified view of a portion of Figure 3.

[0022] As shown in Figure 1, the lighting device 100 according to the first embodiment includes a hexahedral shape. Yes, it is possible. The shape of the lighting device 100 is not limited to this. The lighting device 100 is It may be formed with a structure that allows for multi-faceted light emission. For example, the top surface and four sides of the lighting device 100 Light is emitted from the surface. Although the diagram above illustrates light emitting from five surfaces, it is not limited to this. It is not done in this way, and light may be emitted through the bottom surface.

[0023] Referring to Figures 1 to 3, the lighting device 100 is a substrate (PCB (Printed Circuit Board)) 110, a plurality of light sources 120 arranged on the substrate 110, and on the light sources 120 The arrangement includes a resin layer 130 and a phosphor layer 140 placed on top of the resin layer 130. It is possible.

[0024] The substrate 110 may include an insulating or conductive material. The substrate 110 can be made of a rigid or flexible material. It can be made of a transparent or opaque material. The substrate 110 has a conductive pattern on top. An electrode is formed.

[0025] The light source 120 is placed on the substrate 110. N units are arranged in the first direction or long axis direction of 10, and M units are arranged in the second direction or short axis direction. It may be done. The spacing between the N light sources 120 arranged along the long axis of the substrate 110 is the same. Or they may be different. The first direction is the column direction, and the second direction is the row direction, and the front The first and second directions may be mutually orthogonal. N is an integer of 3 or more. The aforementioned M may be an integer of 2 or more or 3 or more. The substrate 110 is arranged in the direction of the short axis. The spacing between the M light sources 120 may be the same or different. The separation distance is appropriately set to effectively realize the area light source.

[0026] The light source 120 may include a light-emitting element. The light source 120 may emit blue, green, and red light. It can emit colored, white, infrared, or ultraviolet light. The light source 120 is, for example, It can emit blue light in the range of 420nm to 470nm. The light source 120 is It may be provided from a compound semiconductor. The light source 120 includes a semiconductor, for example, a group II-VI semiconductor. Alternatively, it may include a group III-V compound semiconductor. For example, the light source 120 may be aluminum The elements selected are nium (Al), gallium (Ga), indium (In), phosphorus (P), arsenic (As), and nitrogen (N). It must contain at least two or more elements.

[0027] The light source 120 may include a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer. The first and second conductivity type semiconductor layers are compound semiconductors of group II-group VI or group III-group V. It can be realized by at least one of the following. The first and second conductivity type semiconductor layers are, for example, For example, In x Al y Ga 1‐x‐y Semiconductor having composition formula N(0≦x≦1, 0≦y≦1, 0≦x+y≦1) It can be made of a body material. For example, the first and second conductivity type semiconductor layers may be GaN, AlN, A group including AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, AlGaInP, etc. It may include at least one selected from the first conductive semiconductor layer. The first conductive semiconductor layer may be Si, Ge, The n-type semiconductor layer may be doped with n-type dopants such as Sn, Se, or Te. The dual-conductivity semiconductor layer is a p-type semiconductor dopant doped with p-type dopants such as Mg, Zn, Ca, Sr, and Ba. The active layer may be a conductive layer. The active layer can be embodied in a compound semiconductor. The layer is embodied by at least one of the group II-group VI or group III-group V compound semiconductors, for example. This is possible. When the active layer is implemented in a multi-well structure, the active layer is arranged alternately. It can include multiple well layers and multiple barrier layers, In x Al y Ga 1‐x‐y N(0≦x≦1 It may be arranged in a semiconductor material having the composition formula (0≦y≦1, 0≦x+y≦1). For example For example, the active layer may include InGaN / GaN, GaN / AlGaN, AlGaN / AlGaN, InGaN / AlGaN, InGaN / InGaN, A Selected from the group including lGaAs / GaAs, InGaAs / GaAs, InGaP / GaP, AlInGaP / InGaP, and InP / GaAs. It can contain at least one of the following.

[0028] A reflective layer (not shown) may be further formed on the upper part of the substrate 110. The layer serves to guide the light generated from the light source 120 upwards. The reflective layer is white The material may include. The reflective layer may include a resin material. The concrete or epoxy may contain a reflective material, such as TiO2. The reflective layer may be placed between the substrate 110 and the resin layer 130. It is positioned to be smaller than the thickness of 120 and reflects the light emitted to the side of the light source 120. It is possible.

[0029] The resin layer 130 may be placed on the substrate 110 and the light source 120. The resin layer 130 can cover the top and side surfaces of the light source 120. The upper surface of the resin layer 130 is formed flat, and each side surface of the resin layer 130 includes a curved surface. The resin layer 130 can have a polygonal shape in its top view. , may include at least four sides. The resin layer 130 has a top view shape They can have a circular or elliptical shape and may include curved sides.

[0030] The upper surface of the resin layer 130 faces the lower surface of the phosphor layer 140, and the side surface of the resin layer 130 This can face the side surface of the phosphor layer 140. The resin layer 130 is a transparent resin. Resin materials, such as UV (Ultra Violet) resin, silicone, or epoxy resins. The material may also be urethane acrylate. The UV resin may, for example, use urethane acrylate as the main material. A resin (oligomer type) with gomer as the main ingredient can be used. For example, synthetic o A urethane acrylate oligomer, which is a ligand, can be used. IBOA (isobornyl acrylate) and HBA (Hydroxybutyl acrylate) are low-boiling point dilutable reactive monomers. It may further contain monomers mixed with ate, HEMA (Hydroxy Metaethyl Acrylate), etc. In addition, photoinitiators (e.g., 1-hydroxycyclohexyl phenyl-ketone, diphenyl) are used as additives. Mix with Diphwnyl (2,4,6-trimethylbenzoyl phosphine oxide), or antioxidants, etc. This is possible. The UV resin consists of 10-21% oligomer, 30-63% monomer, and additives. The composition may consist of 1.5 to 6% of the additive. In this case, the mono IBOA (isobornyl acrylate) 10~21%, HBA (Hydroxybutyl acrylate) 10~2 It may consist of a mixture of 1% and 10-21% HEMA (Hydroxy Metaethyl Acrylate). The additive should be designed to initiate photoreactivity by adding 1-5% of a photoinitiator. It can be made from a mixture in which the yellowing phenomenon can be improved by adding 0.5-1% antioxidant. Yes, it is possible. The formation of the resin layer 130 using the above-described composition is possible by using a UV resin instead of a light guide plate. By forming a layer with a resin such as oil, the refractive index and thickness can be adjusted, and the above-mentioned composition can be used This allows us to satisfy all requirements regarding adhesive properties, reliability, and mass production speed. The lipid layer 130 may further contain a dispersing agent (beads or dispersing agent) inside. The diffusing agent may have a spherical shape, and its size may be in the range of 4 μm to 6 μm. This is possible. The shape and size of the diffusing agent are not limited thereto.

[0031] The resin layer 130 was formed as a single layer, but it may also be formed as multiple layers. For example, before the multiple layers The resin layer 130 comprises a first resin layer free of impurities on the substrate 110, and the first resin layer A second resin layer containing a diffusion agent may be included on top of it. Conversely, the multilayer resin layer 130 may be The substrate 110 includes a first resin layer containing a diffusing agent and a second resin layer that does not contain impurities. It is possible.

[0032] The phosphor layer 140 may be formed on the resin layer 130. It may also contain a light-transmitting material. The phosphor layer 140 contains a transparent insulating material and wavelengths inside It may include a conversion means. The phosphor layer 140 may be made of silicon material, for example. For example, the silicon material may have different chemical bonds with each other. The silicon is inorganic As a polymer formed by the bonding of silicon, a material, and carbon, an organic substance, it contributes to the thermal stability and chemical properties of inorganic materials. Physical stability, abrasion resistance, gloss, etc., and the properties of organic materials such as reactivity, solubility, elasticity, processability, etc. It has the following physical properties. The silicon is general silicon, fluorinated silicon with a higher fluorine ratio. It can contain phosphorus. Increasing the fluorine ratio of the fluorosilicon can improve the moisture resistance. It has the effect of being able to improve.

[0033] The phosphor layer 140 can include wavelength conversion means for the light emitted from the light source 120 to be incident and wavelength-converted light. For example, the phosphor layer 140 can include at least one of phosphors or quantum dots. The phosphor or quantum dot can emit blue, green, and red light. The phosphor is uniformly arranged inside the phosphor layer 140. The phosphor can include a fluoride compound phosphor, for example, at least one of MGF-based phosphor, KSF-based phosphor, or KTF-based phosphor. The phosphor can emit light with different peak wavelengths, and the light emitted from the light source 120 can be emitted with different yellow and red or different red peak wavelengths. When the phosphor is a red phosphor, the red phosphor can have a wavelength range from 610 nm to 650 nm, and the wavelength can have a width of less than 10 nm. The red phosphor can include a fluoride-based phosphor. The fluoride-based phosphor can include at least one of KSF-based red K2SiF6:Mn 、K2TiF6 :Mn 、NaYF4:Mn 、NaGdF4:Mn 、K3SiF7:Mn 4+ 、K2TiF6 :Mn 4+ 、NaYF4:Mn 4+ 、NaGdF4:Mn 4+ 、K3SiF7:Mn 4+ a Si 1‐c F b :Mn 4+ cIt can have the following compositional formula, where a is 1 ≤ a ≤ 2.5 and b is 5 ≤ b ≤ 6.5, and c satisfies 0.001 ≤ c ≤ 0.1.

[0034] Furthermore, the fluoride-based red phosphor is designed to improve reliability at high temperatures and high humidity. Each is coated with a fluoride that does not contain Mn, or the phosphor surface or contains Mn. The fluoride coating surface, which does not have a fluoride coating, may further include an organic coating. Unlike other phosphors, fluoride-based red phosphors like the one described have a width of 10 nm or less. Because it can be expressed, it can be used in high-resolution devices. The phosphor composition in the example is basically It must conform to stoichiometry, and each element must be within its respective group on the periodic table. It can be substituted with other elements. For example, Sr can be substituted with alkaline earth elements (II) such as Ba, Ca, and Mg. Y can be substituted with lanthanide compounds such as Tb, Lu, Sc, and Gd. Additionally, activators such as Eu can be substituted. It can be substituted with Ce, Tb, Pr, Er, Yb, etc., depending on the desired energy level, and the activator is single Inertants or the like may be further applied for deactivation or to modify the properties.

[0035] The quantum dot may contain a II-VI compound or a III-V compound semiconductor, and is red. It can emit light. The quantum dots are, for example, ZnS, ZnSe, ZnTe, CdS, CdSe, Cd Te, GaN, GaP, GaAs, GaSb, InP, InAs, In, Sb, AlS, AlP, AlAs, PbS, PbSe, Ge, Si, It can consist of things like CuInS2, CuInSe2, and combinations thereof.

[0036] The phosphor layer 140 may contain a phosphor and a colored ink. It can contain red ink internally. The red ink is released when the light source 120 is lit. In this case, the outer surface of the lighting device 140 appears red. That is, the lighting device 100 is red when the light is turned on. In both cases, when the light is not on, it appears red, thus preventing a sense of incongruity due to color differences. This is possible. The red ink may contain red powder or red ink particles.

[0037] The phosphor layer 140 comprises a first region 141 placed on the resin layer 130 and the resin The phosphor layer 140 may include a second region 143 located on the side surface of the lipid layer 130. The first region 141 is located perpendicular to the substrate 110 and overlaps with a portion of the N light sources 120. - It can be wrapped. The first region 141 of the phosphor layer 140 is the substrate 110 Part of at least one light source 120 positioned on the outermost edge at the top overlaps vertically You don't have to do it.

[0038] The first region 141 of the phosphor layer 140 is arranged parallel to the upper surface of the substrate 110. The width of the first region 141 of the phosphor layer 140 is smaller than the width of the substrate 110. It may be cut. The edge of the first region 141 of the phosphor layer 140 is the side surface of the substrate 110. It may be positioned further inside. The upper or lower surface of the first region 141 of the phosphor layer 140 is It can include flat surfaces.

[0039] The second region 143 of the phosphor layer 140 is the edge of the first region 141 of the phosphor layer 140. It extends in the direction of the substrate 110. The second region 143 of the phosphor layer 140 includes a curved surface. This can be done. The second region 143 extends from the edge of the first region 141 to the phosphor layer 14 It may be positioned outside the imaginary straight line that connects to the lower end of 0. The phosphor layer 140 Region 2 143 is a curved surface having a shape that bulges outward from the inside to the outside of the resin layer 130. It may include. The second region 143 of the phosphor layer 140 is one of the upper parts of the substrate 110. The light source 120 and the substrate 110 are positioned on the outermost side and overlap vertically. It may be formed. In the embodiment, the thickness of the first region 141 of the phosphor layer 140 and the phosphor layer 14 The thickness of the second region 143 of 0 may be the same. As another example, the first region 141 The thickness may be greater than the thickness of the second region 143.

[0040] The side surface of the phosphor layer 140 is formed to have a curved surface, The distance between the 40 corner region and the light source 120 located on the outermost edge of the substrate 100 decreases, The occurrence of dark lines at the interface between the first region 141 and the second region 143 of the phosphor layer 140 This can be prevented. In a comparative example, the polygonal phosphor layer had corners between the top and side surfaces. Dark lines may occur. An embodiment of the invention is a phosphor layer having curved side and top surfaces. Dark lines on the upper edge are removed.

[0041] The above explanation has focused on the arrangement structure of the light source, resin layer, and phosphor layer, but the removal of dark lines and light To improve the uniformity, the distance between the light source and the phosphor layer, and the second of the phosphor layer The relationship between the radius of curvature of the region and the thickness of the resin layer and the phosphor layer is important. We will now explain each component of the lighting device in detail.

[0042] As shown in Figure 4, the light source 120 is perpendicular to the first region 141 of the phosphor layer 140. The first light source 1 overlaps perpendicularly with the second region 143 of the phosphor layer 140. 21 may be included. The first light source 121 overlaps the first region 141 in a vertical direction. It can be positioned outside the light source or adjacent to it by the curved surface of the resin layer 130. Here, the first light source 121 is the plurality of light sources 120 arranged on the substrate 100. Among these, the light source was positioned so as to be closest to the side or outer curved surface of the resin layer 130. That's fine.

[0043] Each side surface of the resin layer 130 may be curved. Each side surface of the resin layer 130 is The resin layer 130 bulges outward from a hypothetical straight line connecting the upper and lower edges. This can be done. Each side surface of the resin layer 130 may be a curved surface with a bulge. The surfaces may be arranged along the periphery of the resin layer 130. Between the sides of the resin layer 130 The boundary or corner portion may be a curved surface.

[0044] The second region 143 of the phosphor layer 140 may include a curved surface. The second region 143 may include the first point P1, the second point P2, and the third point P3. The first location P1, the second location P2, and the third location P3 are in the second region 143 of the phosphor layer 140. It may be a point on the outer surface. The outer surface of the second region 143 is the first point P1, the It may include two locations P2 and a third location P3. The first location P1 is the phosphor layer 1 40 may be positioned adjacent to the substrate 110 on its surface and outside the first light source 121. The first point P1 may be positioned lower than a horizontal line on the upper surface of the first light source 121. i. The second point P2 is located at a position higher than the upper surface of the light source 120, and the first point The third point P3 may be located inside a vertical, imaginary line passing through P1. A virtual perpendicular line passing through the second point P2 is adjacent to the first region 141 from point P2. It may be placed on the inside.

[0045] The first point P1 emits fluorescence horizontally from the center C1 of the first light source 121 to the substrate 110. The third may be a position that contacts or intersects with the outer surface of the second region 143 of the body layer 140. Point P3 is located on a straight line perpendicular to the substrate 110 from the center C1 of the first light source 121 and the phosphor layer. The second point may be a position that contacts or intersects with the outer surface of the second region 143 of 140. P2 is any of the locations between the first point P1 and the third point P3 in the second region 143 of the phosphor layer 140. It may be a single region. The first point P1 and the third point P3 are the first light source 12 The points may be those that intersect horizontal and vertical lines with respect to the center C1 of point 1.

[0046] The first distance L1 between the center C1 of the first light source 121 and the first point P1, and the first light source The second distance L2 from the center C1 of 121 to the second point P2, and the middle of the first light source 121 The third distance L3 from the heart C1 to the third point P3 may be different from each other. The third distance L3 from the center C1 of 121 to the third point P3 is within the first light source 121. The first distance L1 between the center C1 and the first point P1, and the distance from the center C1 of the first light source 121 It may be formed to be larger than the second distance L2 to the second point P2. The second distance L2 between the center C1 and the second point P2 is the distance from the center C1 of the first light source 121 to the first It may be formed to be greater than the first distance L1 to point P1.

[0047] To explain the conventional problem, if the side surface of the resin layer 140 is not curved, one of the light sources The second distance L2 between the center C1 of the first light source 121, which is positioned on the outermost edge, and the second point P2 is: The third distance L3 between the center C1 of the first light source 121 and the third point P3, and the center of the first light source 121. It is formed at a significantly greater distance than the first distance L2 between C1 and the first point P1. As the distance between the second point P2 and the first light source 121 increases relatively, the second point There is a problem where dark lines appear at point P2 and its surrounding area.

[0048] In this embodiment, the second distance L2 between the center C1 of the first light source 121 and the second point P2 is reduced. The second region 143 of the phosphor layer 140 is formed to have a curved surface, thereby generating dark lines. It has the effect of preventing this from happening. Furthermore, the embodiment is the first distance L1, the second distance L2 and the third By forming a curved surface such that the difference in the value of distance L3 is almost negligible, the side surface of the phosphor layer 140 This improves light uniformity and also improves light uniformity between the top and side surfaces of the phosphor layer 140. It is possible. In practice, there is a difference in the distance values ​​of the first distance L1, the second distance L2, and the third distance L3, but Firefly The difference in the aforementioned distance values ​​becomes very small as you move towards the top and sides of the photon layer 140, so from the outside it is visible At that time, it is difficult to perceive the difference in brightness.

[0049] The first distance L1 between the center C1 of the first light source 121 and the first point P1 is the first light source 12 The distance between the first light source 121 and the adjacent light source may be determined by the distance between them. The distance L4 is such that the first light source 121 is positioned to be 5.5 mm to 6.5 mm. Yes, it is possible. If the distance L4 between the first light source 121 and the adjacent light source exceeds 6.5 mm, When viewed from the outside, a hotspot may occur in the area where the first light source 121 is located. .

[0050] The first distance L1 between the center C1 of the first light source 121 and the first point P1 is the distance between two adjacent points. Position the first light source 121 such that the fourth distance L4 between the light sources is 44% to 55%. This is possible. For example, the first distance L1 between the center C1 of the first light source 121 and the first point P1 is 3 The distance between the center C1 of the first light source 121 and the first point P1 is If distance 1 L1 is less than 44% or greater than 55% of distance 4 L4, then the phosphor layer 140 Light emitted through region 143 may appear excessively bright or dim, resulting in uniform light distribution. A problem may occur where the intensity decreases.

[0051] The radius of curvature R1 of the second region 143 of the phosphor layer 140 is the same as the phosphor layer 140 and the The thickness of the resin layer 130 may be determined by the second region 143 of the phosphor layer 140. The radius of curvature R1 is the thickness t1 of the resin layer 130 perpendicular to the substrate 110 and the number of the phosphor layer 140. The thickness t2 of each region 141 may be greater than or equal to the sum of the thicknesses t2. For example, the firefly The radius of curvature R1 of the second region 143 of the photomaterial layer 140 is perpendicular to the resin layer 1 of the substrate 110. 100% to 11% of the sum of the thickness t1 of 30 and the thickness t2 of the first region 141 of the phosphor layer 140 It may be formed to be 0%. The thickness t1 of the resin layer 130 in the vertical direction is maximum It can be thick.

[0052] Here, the thickness t1 of the resin layer 130 is 5.0 mm to 5.5 mm, and the phosphor layer 1 The thickness t2 of the first region 141 of 40 can be 0.5 mm. The radius of curvature R1 of the second region 143 of the phosphor layer 140 shall be 5.5 mm to 6.0 mm. This can be done. Here, the thickness t2 of the first region 141 of the phosphor layer 140 is made less than 0.5 mm. When formed, the light efficiency can be increased. The thickness of the first region 141 of the phosphor layer 140 Since the process of forming a thickness of t2 to less than 0.5 mm is practically difficult, the first region of the phosphor layer 140 It is effective to minimize the thickness t2 of region 141.

[0053] Furthermore, the phosphor layer 140 includes a fourth point P4 between the first region 141 and the second region 143. This is possible. The fourth point P4 may be located in a region on the outer surface of the phosphor layer 140. Furthermore, the fifth point P5 can be included on the substrate 110 that is the closest to the fourth point P4.

[0054] The distance L5 between the fourth point P4 of the phosphor layer 140 and the fifth point P5 of the substrate 110 is The distance L1 from the first point P1 in the second region 143 of layer 140 to the first light source 120 is greater than It is also fine to listen to it. Also, between the fourth point P4 of the phosphor layer 140 and the fifth point P5 of the substrate 110 The distance L5 is smaller than or equal to the radius of curvature R1 of the second region 143 of the phosphor layer 140. It may be done.

[0055] The phosphor layer 140 is in contact with the substrate 110 in the second region 143 of the phosphor layer 140. It may include a seventh location P7. The seventh location P7 is the second region 14 of the phosphor layer 140. 3 may be the inner surface of the phosphor layer 140 that is in contact with or facing the resin layer 130.

[0056] The distance L between the seventh point P7 in the second region 143 of the phosphor layer 140 and the side surface of the light source 120 7 may be formed to be smaller than the distance L4 between the light sources 120. The resulting fifth point P5 is greater than the distance from the seventh point P7 to the first light source 120. Furthermore, they may be placed within a region smaller than or equal to the radius of curvature R1.

[0057] As described above, the curvature of the second region 143 of the phosphor layer 140 is affected by the conditions of the lighting device 100. The radius of extension R1 is determined.

[0058] Figure 5 is a perspective view showing the lighting device in Figure 1 with the phosphor layer removed. Figure 6 illustrates the relationship between the light source and the resin layer in the lighting device shown in Figure 5, depending on the distance between them. This is a plan view, and Figure 7 is a cross-sectional view taken along line B-B in Figure 5.

[0059] As shown in Figure 5, the resin layer 130 has a flat upper surface 131 and the upper surface 131 The first side surface 133 is formed by bending toward the substrate 110, and the first side surface 13 The second side surface 135 is positioned adjacent to 3, and the first side surface 133 and the second side surface 135 It may include a corner region 137 positioned between the first side surface 133 and the second side surface. Regions 135 and 137 may include curved surfaces.

[0060] The upper surface 131 of the resin layer 130 can come into contact with the lower part of the first region of the phosphor layer. The sides 133, 135 and corner region 137 of the lipid layer 130 are in contact with the second region of the phosphor layer. This is possible. That is, the upper surface 131, side surfaces 133, 135 and corner regions 137 of the resin layer 130 are They may be formed in a shape corresponding to the inner surface of the phosphor layer.

[0061] The resin layer 130 is in a region that is in contact with or facing the upper surface of the substrate 110. The first side surface 133 of 0 and the corner region 137 may include an eighth point P8 where they contact or face each other. The resin layer 130 has a second side in the region that is in contact with or facing the upper surface of the substrate 110. The 9th point P9 may include contact between 135 and the corner region 137. 30 is the outer surface of the corner region 137 in the region that is in contact with or facing the upper surface of the substrate 110. The tenth point P10 may be included. Here, the resin layer 130 and the upper surface of the substrate 110 The areas in contact or facing each other may include the straight line 133a.

[0062] As shown in Figure 6, the center of the first light source 120 adjacent to the corner region 137 in the resin layer 130 The distance L10 from C1 to the 10th point P10 in the angular region 137 is within the first light source 120. The distance L8 from the core C1 to the eighth point P8 of the resin layer 130 may be the same as the distance L8.

[0063] From the center C1 of the first light source 120 adjacent to the corner region 137 of the resin layer 130 to the corner region 13 The distance L10 from point 7, 10th point P10, is from the center C1 of the first light source 120 to the resin layer 130. The distance L9 to the 9th point P9 may be formed to be the same as that distance.

[0064] As a result, the light emitted from the corner region 137 of the resin layer 130 is directed to the first side of the resin layer 130. It can have the same brightness as the light emitted from surface 133 and the second side surface 135.

[0065] As shown in Figure 7, the outer surface of the corner region 137 of the resin layer 130 is the center of the first light source 120. It can include the 11th point P11, which is the shortest perpendicular distance from C1 to the substrate 110. Therefore, the direct distance L11 from the center C1 of the first light source 120 to the 11th point P11 is the distance from the first light source The formation may be larger than the distance L10 from the center C1 of 120 to the 10th point P10. That is, the corner region 137 of the resin layer 130 is the same as the side surface of the resin layer 130, and is the upper part of the resin layer 130. The distance from the first light source 120 can increase as you move toward the surface. Here, the substrate 1 When a reflective layer is placed between 10 and the resin layer 130, it is placed on the substrate 110. Each of the points P5 and P7 is located on or in contact with the reflective layer, It may also be the point closest to the substrate 110. The substrate 110 and the phosphor layer 140 If a reflective layer is placed between the lower ends, the lower end of the phosphor layer 140 is in contact with the reflective layer or The reflective layer may be located at the point closest to the substrate 110. It may also be a sub-layer.

[0066] Comparing the lighting device according to the embodiment with a conventional lighting device, the conventional lighting device is formed in a polyhedron shape. In this case, it can be seen that dark lines occur in the boundary region between surfaces. On the other hand, the illumination in the embodiment The device prevents the generation of dark lines by forming a curved surface in the boundary region between surfaces. It can be seen that this is possible. Also, by forming the side surface of the lighting device to have a curved surface, the lighting device It can be seen that the light intensity of the area is uniform throughout.

[0067] Figure 8 is a cross-sectional view showing a lighting device according to the second embodiment. The second embodiment may include the same configuration and description as the first embodiment, and redundant explanations will be omitted. I've decided to do it.

[0068] Referring to Figure 8, the lighting device 100 according to the second embodiment includes a substrate 110 and the substrate 11 Multiple light sources 120 arranged on 0, and a resin layer 130 arranged on the light sources 120 The material may also include a phosphor layer 140 disposed on top of the resin layer 130.

[0069] The substrate 110 may include an insulating or conductive material. The substrate 110 may be made of a rigid or flexible material. It can be made of an opaque material. The substrate 110 has electrodes with a conductive pattern on top. A substrate 110 is formed. The substrate 110 can be designed in various ways depending on the intended use.

[0070] The light source 120 may be placed on the substrate 110. The light source 120 emits light. It may include elements. The light source 120 has N light sources 1 in the direction of the long axis (row) of the substrate 110. 20 may be arranged, and M light sources 120 may be arranged in the short axis (row) direction of the substrate 110. The resin layer 130 may be placed on the substrate 110 and the light source 120. 130 may be formed to cover the top and side surfaces of multiple light sources 120. The layer 140 may be placed on top of the resin layer 130.

[0071] The phosphor layer 140 comprises a first region 141 formed on the resin layer 130 and the resin layer 13 A second region 143 is located on the side of 0, and a second region 143 is located between the substrate 110. It can include the third region 145.

[0072] The first region 141 of the phosphor layer 140 has N light sources 12 perpendicular to the substrate 110. It can overlap with a portion of 0. The first region 141 of the phosphor layer 140 The phosphor layer 140 may be arranged parallel to the upper surface of the substrate 110. Region 141 may include flat surfaces.

[0073] The second region 143 of the phosphor layer 140 is located from the side of the first region 141 of the phosphor layer 140. It extends in the direction of the substrate 110. The second region 143 of the phosphor layer 140 may include a curved surface. The second region 143 of the phosphor layer 140 may include a curved surface that bulges outward. The third region 145 of the phosphor layer 140 is connected to the second region 143 of the phosphor layer 140 and the substrate. They may be arranged vertically between 110. One side of the third region 145 of the phosphor layer 140 is The second region 143 of the phosphor layer 140 is in contact with the other side of the third region 145 of the phosphor layer 140. The upper surface of the substrate 110 can be in contact with or facing the upper surface of the phosphor layer 140. The height h1 of region 345 is smaller than the height h2 of the light source 120 or the first light source 121. It may be formed.

[0074] In the example, the thickness of the first region 141 of the phosphor layer 140 and the second region 14 of the phosphor layer 143 The thickness of 3 and the thickness of the third region 145 of the phosphor layer 140 can be formed to correspond. The second region 143 of the phosphor layer 140 is located at the first point P1, the second point P2 and the third point It may include P3. The first location P1, the second location P2, and the third location P3 are phosphors. It may also be the outer surface of the second region 143 of layer 140.

[0075] The first point P1 is the first light source 1 which is positioned closest to the side surface of the resin layer 130. From the center C1 of 21 to the substrate 110 in a horizontal direction, the outer surface of the second region 143 of the phosphor layer 140 It may be an area that is in contact with or facing the first point P1 of the phosphor layer 140 The second region 143 and the third region 145 may be areas that are in contact or facing each other. Point P2 is one of the outer surfaces of the second region 143 of the phosphor layer 140. The third point P3 is perpendicular to the substrate 110 from the center C1 of the first light source 121. A straight line and a region that is in contact with or facing the outer surface of the second region 143 of the phosphor layer 140. That's fine.

[0076] The first distance L1 between the center C1 of the first light source 121 and the first point P1, and the first light source The second distance L2 from the center C1 of 121 to the second point P2, and the middle of the first light source 121 The third distance L3 from heart C1 to the third point P3 may be formed to be different from each other. .

[0077] The third distance L3 from the center C1 of the first light source 121 to the third point P3 is the distance from the first light source The first distance L1 between the center C1 of 121 and the first point P1, and the center C of the first light source 121 The first light source may be formed to be larger than the second distance L2 from point 1 to the second point P2. The second distance L2 between the center C1 of 121 and the second point P2 is the same as the center C1 of the first light source 121. The area may be formed to be larger than the first distance L1 to the first point P1.

[0078] The phosphor layer 140 includes a fourth point P4 between the first region 141 and the second region 143. This is possible. The fourth point P4 may be located on the outer surface of the phosphor layer 140. A fifth point P5 can be included on the substrate 110 that is the closest to point P4. The distance L5 between the fourth point P4 of layer 140 and the fifth point P5 of the substrate 110 is the distance between the phosphor Even if the distance from the first point P1 in the second region 143 of layer 140 to the first light source 121 is greater than the distance from the first point P1 in the second region 143 of layer 140 Good. The distance L between the fourth point P4 of the phosphor layer 140 and the fifth point P5 of the substrate 110. 5 is smaller than or the same as the radius of curvature R1 of the second region 143 of the phosphor layer 140. That's fine.

[0079] The third region 145 of the phosphor layer 140 may include the sixth location P6. At point P6, the outer surface of the third region 145 of the phosphor layer 140 and the upper surface of the substrate 110 are in contact. It may be a region of contact or opposing region. From the center C1 of the first light source 121 to the sixth point P6 The distance L6 to is greater than the distance L1 from the center C1 of the first light source 121 to the first point P1. It is not necessary. Here, if a reflective layer is placed between the substrate 110 and the resin layer 130 Each point P5, P7, which is placed on the substrate 110, is located on the reflective layer or the reflection layer. This may be a point in contact with the emission layer, or it may be the point closest to the substrate 110. When a reflective layer is placed between the substrate 110 and the lower end of the phosphor layer 140, the phosphor The lower end of the body layer 140 may be in contact with the reflective layer or be the point closest to the substrate 110. i. The reflective layer may be the upper layer of the substrate 110.

[0080] The lighting device according to the second embodiment has a straight line perpendicular to the upper surface of the substrate 110 on the side surface of the resin layer 130. By including the phosphor layer 140, the brightness of the light emitted from the side can be formed more uniformly. It is effective.

Claims

1. circuit board and Multiple light sources arranged on the substrate, A resin layer placed on the substrate and covering the plurality of light sources, The resin layer includes a phosphor layer disposed on top of the resin layer, Three or more of the aforementioned multiple light sources are arranged in a row direction. Three or more of the aforementioned multiple light sources are arranged in the row direction. The surface of the resin layer has an upper surface and a plurality of side surfaces on the outside of the upper surface. Each of the multiple sides of the resin layer has a bulging curved surface, The phosphor layer has a first region disposed on the upper surface of the resin layer and a second region disposed on multiple sides of the resin layer. The second region extends from the edge of the first region to the substrate with a curved surface, The plurality of light sources include a first light source arranged on the outermost side, The curved surface of the resin layer and the second region of the phosphor layer overlap perpendicularly with the first light source. Light generated from the multiple light sources is emitted through the upper surface of the resin layer and the curved surface. The corner between two adjacent sides of the resin layer has a bulging curved surface. The corner of the resin layer overlaps the first light source in a direction perpendicular to it, in this lighting device.

2. The lighting device according to claim 1, wherein the phosphor layer is arranged on the corner of the resin layer.

3. The lighting device according to claim 1, wherein the upper surface of the resin layer and the first region of the phosphor layer are extended parallel to each other.

4. The lighting device according to claim 1, wherein the second region of the phosphor layer has a bulging curved surface.

5. The aforementioned multiple light sources emit blue light, The lighting device according to any one of claims 1 to 4, wherein the phosphor layer has a red phosphor.

6. The lighting device according to any one of claims 1 to 5, wherein the phosphor layer has a curved region that bulges outward from the corner of the resin layer.

7. The second region includes a first point that is horizontally tangent to the substrate from the center of the first light source that is closest to the side surface of the resin layer, a second point on the curved surface of the resin layer, and a third point through which a straight line perpendicular to the substrate passes from the center of the first light source. The lighting device according to claim 6, wherein the second distance from the center of the first light source to the second point is greater than the first distance from the center of the first light source to the first point, and less than the third distance from the center of the first light source to the third point.

8. The lighting device according to claim 7, wherein the first distance is 44% to 55% of the distance between the light sources.

9. The lighting device according to claim 8, wherein the distance between the light sources is 5.5 mm to 6.5 mm.

10. The lighting device according to any one of claims 1 to 9, wherein the radius of curvature of the curved surface of the second region is greater than or equal to the sum of the thickness of the resin layer and the thickness of the first region of the phosphor layer in a direction perpendicular to the upper surface of the substrate.

11. The lighting device according to claim 10, wherein the sum of the thickness of the resin layer and the thickness of the first region of the phosphor layer is 5.5 mm to 6.0 mm in the vertical direction.

12. The phosphor layer includes a fourth point located between the first region and the second region, and a seventh point where the outer surface of the substrate and the outer surface of the second region face each other. The substrate includes a fifth point on the substrate which is the shortest distance from the fourth point to the upper surface of the substrate, The lighting device according to any one of claims 7 to 9, wherein the fifth point on the substrate is greater than the distance from the seventh point to the first light source that is closest to the first point.

13. The phosphor layer includes a third region perpendicular to the substrate between the second region of the phosphor layer and the substrate, The third region includes a sixth point facing the substrate, The lighting device according to any one of claims 7 to 9, wherein the distance from the center of the first light source to the sixth point is greater than the first distance.

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