Light emitting device

Abstract

This light emitting device includes: a substrate on which a first wiring layer and a second wiring layer insulated from the first wiring layer are disposed on the surface thereof; at least one light emitting element having a first terminal electrically connected to the first wiring layer, a second terminal electrically connected to the second wiring layer, and a light emitting unit 120 that emits light when a prescribed threshold voltage is applied across the first terminal and the second terminal; a first protective layer covering the first wiring layer and the second wiring layer so as to surround the at least one light emitting element; a second protective layer separated from the first protective layer and covering at least one among the first wiring layer and the second wiring layer; and a reflective member that is disposed so as to surround the at least one light emitting element and cover the first protective layer, and that reflects light emitted from the light emitting unit, wherein an outer edge of an end of the reflective member facing the second protective layer coincides with an outer edge of an end of the first protective layer facing the second protective layer.

Description

Light-emitting device

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

[0002] Various techniques for improving the luminous efficiency of light-emitting devices that use LED elements as light-emitting elements are known. For example, Japanese Patent Laid-Open Publication No. 2012-54383 (hereinafter referred to as Patent Document 1) describes a light-emitting device that includes a light-emitting element mounted on a circuit board, a dam material surrounding the light-emitting element, a reflective material fluidly applied to the bottom of the area surrounded by the dam material, and a sealing resin disposed in the area surrounded by the dam material and sealing the light-emitting element. The light-emitting device described in Patent Document 1 has a reflective material fluidly applied to the bottom of the area surrounded by the dam material, which improves the luminous efficiency and makes it easy to form a reflective material by applying a fluid reflective material to the area surrounded by the dam material.

[0003] Japanese Patent Laid-Open No. 2015-201665 (hereinafter referred to as Patent Document 2) describes a light emitting device having a printing frame surrounding a light emitting element and a white material filled in the area surrounded by the printing frame. Furthermore, Japanese Patent Laid-Open No. 2021-141274 (hereinafter referred to as Patent Document 3) describes a light emitting device having a mounting substrate with a groove formed on its upper surface and a light emitting element arranged in the area surrounded by the groove.

[0004] The light-emitting device described in Patent Document 1 has a dam material placed to prevent the outflow of the fluid reflective material before solidification, but in order to reduce the manufacturing costs of light-emitting devices, there is a demand for a light-emitting device that has a structure that omits the dam material that prevents the outflow of the reflective material.

[0005] Furthermore, in the light-emitting device described in Patent Document 2, the height of the printing frame is much lower than the height of the light-emitting element, so in order to prevent the white material from leaking and spreading from the printing frame, the white material is filled in small amounts at a time, which increases the filling time and may reduce manufacturing efficiency. Also, in the light-emitting device described in Patent Document 3, grooves are formed on the top surface of the mounting substrate, so a wiring pattern is not placed on the top surface of the mounting substrate, and the light-emitting element is connected to the wiring pattern placed on the back surface of the mounting substrate via a via, which requires a via formation process and may increase manufacturing costs.

[0006] The present disclosure is intended to solve such problems, and aims to provide a light emitting device having a structure that does not require a dam material that prevents the reflective member from leaking out.

[0007] The light-emitting device according to the present disclosure comprises a substrate having a first wiring layer and a second wiring layer insulated from the first wiring layer disposed on its surface, at least one light-emitting element having a first terminal electrically connected to the first wiring layer, a second terminal electrically connected to the second wiring layer, and a light-emitting portion that emits light when a predetermined threshold voltage is applied between the first terminal and the second terminal, a first protective layer that covers the first wiring layer and the second wiring layer so as to surround the at least one light-emitting element, a second protective layer that is spaced apart from the first protective layer and covers at least one of the first wiring layer and the second wiring layer, and a reflective material that is disposed so as to surround the at least one light-emitting element and cover the first protective layer and that reflects light emitted from the light-emitting portion, and the outer edge of the reflective material at the end facing the second protective layer coincides with the outer edge of the end of the first protective layer facing the second protective layer.

[0008] Furthermore, the light emitting device according to the present disclosure further comprises a phosphor sheet that is arranged to cover the light emitting section and contains a phosphor that absorbs light emitted from the light emitting section and converts the wavelength of the light into light having a different wavelength from the wavelength of the light emitted from the light emitting section, and a transparent resin that is arranged along the side of the light emitting section and has a fillet shape that becomes thicker as it approaches the phosphor sheet, and it is preferable that the reflective material is arranged so as to contact the outer edge of the upper surface of the phosphor sheet.

[0009] Furthermore, in the light emitting device according to the present disclosure, the first protective layer preferably has a protrusion that protrudes toward the space formed between the first terminal and the second terminal.

[0010] Furthermore, in the light-emitting device according to the present disclosure, it is preferable that the at least one light-emitting element is a plurality of light-emitting elements, and the protrusion protrudes from between adjacently arranged light-emitting elements toward the space formed between the first terminal and second terminal of each of the light-emitting elements.

[0011] Furthermore, in the light emitting device according to the present disclosure, the second protective layer is preferably disposed so as to surround the first protective layer.

[0012] Furthermore, the light emitting device according to the present disclosure preferably further includes a third protective layer arranged at a distance from the first protective layer, the substrate having a rectangular planar shape with a pair of short sides and a pair of long sides, the second protective layer being arranged so as to be in contact with one of the pair of short sides and cover the first wiring layer, the third protective layer being arranged so as to be in contact with the other of the pair of short sides and cover the second wiring layer, and the outer edge of the reflective material preferably coinciding with the outer edge of the end of the first protective layer facing the second protective layer and the third protective layer and coinciding with the pair of long sides.

[0013] Furthermore, the light-emitting device according to the present disclosure further has a third protective layer, a fourth protective layer, and a fifth protective layer arranged at a distance from the first protective layer, the substrate has a rectangular planar shape having four sides, the second protective layer, the third protective layer, the fourth protective layer, and the fifth protective layer are arranged at the four corners of the substrate, and it is preferable that the outer edge of the reflective material coincides with the outer edge of the end of the first protective layer facing the second protective layer, the third protective layer, the fourth protective layer, and the fifth protective layer, and also coincides with the four sides.

[0014] Furthermore, the light emitting device according to the present disclosure preferably further has a third protective layer spaced apart from the first protective layer, wherein the at least one light emitting element is arranged in a ring shape, the first protective layer and the reflective material have a ring-shaped planar shape and are arranged so as to surround the at least one light emitting element, the second protective layer has a circular planar shape and is arranged inside the first protective layer, the third protective layer is arranged outside the first protective layer, and the inner edge of the reflective material preferably coincides with the inner edge of the first protective layer and the outer edge of the reflective material preferably coincides with the outer edge of the first protective layer.

[0015] The light emitting device according to the present disclosure can have a structure that does not require a dam material that prevents the reflective member from leaking out.

[0016] 1. A perspective view of a light emitting device according to a first embodiment. A cross-sectional view taken along line A-A in FIG. 1. A plan view of a circuit board shown in FIG. 1. A plan view of a first protective layer and a second protective layer disposed on the surface of the circuit board shown in FIG. 1. A plan view of the first protective layer shown in FIG. 4. A flowchart showing a manufacturing method of the light emitting device shown in FIG. 1. A diagram showing a light emitting element mounting step shown in FIG. 6, where (a) is a perspective view and (b) is a cross-sectional view corresponding to the cross-sectional view taken along line A-A in FIG. 1. A diagram showing a phosphor sheet mounting step shown in FIG. 6, where (a) is a perspective view and (b) is a cross-sectional view corresponding to the cross-sectional view taken along line A-A in FIG. 1. (a) is a perspective view of a light emitting device according to a second embodiment, (b) is a plan view of a light emitting device shown in FIG. 9(a), and (c) is a cross-sectional view taken along line B-B in FIG. 9(a). A perspective view of a light emitting device according to a third embodiment. A perspective view of a light emitting device according to a fourth embodiment. A perspective view of a light emitting device according to a fifth embodiment. A perspective view of a light emitting device according to a sixth embodiment. A perspective view of a light emitting device according to a seventh embodiment. A perspective view of a light emitting device according to a first modified example of the seventh embodiment. 15. An exploded perspective view of the light-emitting device shown in FIG. 15. A perspective view of a light-emitting device according to a second modified example of the seventh embodiment. A perspective view of a light-emitting device according to the eighth embodiment. A cross-sectional view taken along line B-B in FIG. 18. A plan view of the upper surface of the reflector shown in FIG. 18. A diagram showing an example of the arrangement of the chromaticity modification unit shown in FIG. 18. A flowchart showing a method for manufacturing the light-emitting device shown in FIG. 18. (a) is a diagram (part 1) showing a comparison between the chromaticity adjustment range in the light-emitting device shown in FIG. 18 and the chromaticity adjustment range in a light-emitting device according to a comparative example, and (b) is a diagram (part 2) showing a comparison between the chromaticity adjustment range in the light-emitting device shown in FIG. 18 and the chromaticity adjustment range in a light-emitting device according to the comparative example. A plan view of the upper surface of the reflector of a light-emitting device according to a first modified example of the eighth embodiment. (a) is a diagram (part 1) showing a comparison between the chromaticity adjustment range in the light-emitting device shown in FIG. 24 and the chromaticity adjustment range in a light-emitting device according to the comparative example, and (b) is a diagram (part 2) showing a comparison between the chromaticity adjustment range in the light-emitting device shown in FIG. 24 and the chromaticity adjustment range in a light-emitting device according to the comparative example. A plan view of the upper surface of the reflector of a light-emitting device according to a second modified example of the eighth embodiment. FIG. 23 is a plan view of the upper surface of the reflector of the light emitting device according to the third modified example of the eighth embodiment.29 is a flowchart showing a manufacturing method of the light-emitting device shown in FIG. 27. It is a perspective view of a light-emitting device according to a fourth modified example of the eighth embodiment. (a) shows a first example of the arrangement of the chromaticity changer shown in FIG. 29, (b) shows a second example of the arrangement of the chromaticity changer shown in FIG. 29, (c) shows a third example of the arrangement of the chromaticity changer shown in FIG. 29, and (d) shows a fourth example of the arrangement of the chromaticity changer shown in FIG. 29. (a) shows a first modified example of the arrangement of the chromaticity changer in the light-emitting device shown in FIG. 18, (b) shows a second modified example of the arrangement of the chromaticity changer in the light-emitting device shown in FIG. 18, (c) shows a third modified example of the arrangement of the chromaticity changer in the light-emitting device shown in FIG. 18, (d) shows the first modified example of the arrangement of the chromaticity changer in the light-emitting device shown in FIG. 29, (e) shows the second modified example of the arrangement of the chromaticity changer in the light-emitting device shown in FIG. 29, and (f) shows the third modified example of the arrangement of the chromaticity changer in the light-emitting device shown in FIG. 29.

[0017] Hereinafter, a light emitting device according to the present disclosure will be described with reference to the drawings. However, it should be noted that the technical scope of the present disclosure is not limited to the embodiments, but extends to the inventions set forth in the claims and their equivalents.

[0018] (Configuration and Function of Light-Emitting Device According to First Embodiment) FIG. 1 is a perspective view of a light-emitting device according to a first embodiment, and FIG. 2 is a cross-sectional view taken along line AA shown in FIG.

[0019] The light emitting device 1 has a mounting substrate 10, a circuit board 11, four light emitting elements 12a to 12d, a first protective layer 13, a second protective layer 14, a transparent resin 15, a phosphor sheet 16, and a reflector 17. The light emitting device 1 emits white light in response to a voltage being applied to an anode electrode 21 and a cathode electrode 22 formed on the circuit board 11. The light emitting elements 12a to 12d are collectively referred to as light emitting elements 12.

[0020] The mounting substrate 10 is a substrate made of a metal with high thermal conductivity, such as aluminum, and has a substantially rectangular planar shape. The mounting substrate 10 has a pair of notches 11a and 11b formed at opposing corners. The circuit board 11 is formed of an insulating material, such as an epoxy material, and is bonded to the mounting substrate 10. The circuit board 11 has the same planar shape as the mounting substrate 10. An anode electrode 21, also referred to as a first electrode, and a cathode electrode 22, also referred to as a second electrode, are disposed on the circuit board 11 near a pair of corners where the notches 11a and 11b are not formed. The circuit board 11 is also simply referred to as a substrate. Fastening members, such as screws, are engaged with the pair of notches 11a and 11b.

[0021] Fig. 3 is a plan view of the circuit board 11. In Fig. 3, each of the four light emitting elements 12a to 12d is indicated by a broken line, and the anode electrode 21 and the cathode electrode 22 are indicated by a dashed line.

[0022] The circuit board 11 has a first wiring layer 31, a second wiring layer 32, a third wiring layer 33, a fourth wiring layer 34, and a fifth wiring layer 35 arranged on the surface opposite to the surface bonded to the mounting substrate 10. The first wiring layer 31, the second wiring layer 32, the third wiring layer 33, the fourth wiring layer 34, and the fifth wiring layer 35 are thin films formed on a conductive material such as copper. An anode electrode 21 is arranged on the first wiring layer 31, and a cathode electrode 22 is arranged on the second wiring layer 32. The third wiring layer 33 is electrically connected to the first wiring layer 31 via the light emitting element 12a and to the fourth wiring layer 34 via the light emitting element 12b. The fourth wiring layer 34 is electrically connected to the fifth wiring layer 35 via the light emitting element 12c, and the fifth wiring layer 35 is electrically connected to the second wiring layer 32 via the light emitting element 12d.

[0023] Each of the four light-emitting elements 12a to 12d has a light-emitting portion 120, an anode 121 (also referred to as a first terminal), and a cathode 122 (also referred to as a second terminal), and is arranged in a two-row, two-column array. Each of the four light-emitting elements 12a to 12d emits blue light with a dominant wavelength ranging from 445 nm to 495 nm, e.g., 450 nm. Each of the four light-emitting elements 12a to 12d is a surface-mounted (SMD) LED element. The light-emitting portion 120 has a rectangular planar shape and is formed, for example, by an LED made of an InGaN-based compound semiconductor and a sealing material that seals the LED. The anode 121 and cathode 122 are formed of a conductive material such as copper or aluminum and are arranged on the back surface of the light-emitting portion 120. The surface area of ​​each of the four light-emitting elements 12a-12d is narrower than the surface area of ​​the phosphor sheet 16. For example, the length of one side of each of the four light-emitting elements 12a-12d is 1.0 mm, for example. The anode 121 and the cathode 122 are flip-chip connected to the first wiring layer 31, the second wiring layer 32, the third wiring layer 33, the fourth wiring layer 34, and the fifth wiring layer 35 via a conductive adhesive material (not shown), such as solder. Each of the light-emitting elements 12a-12d is not limited to a blue LED element, but may also be a purple LED or near-ultraviolet LED, and the dominant wavelength of the light emitted from the light-emitting element may be in the range of approximately 200 to 440 nm, including the ultraviolet range. Furthermore, each of the light-emitting elements 12a-12d may be an LED die rather than an SMD-type LED element.

[0024] Fig. 4 is a plan view of the first protective layer 13 and the second protective layer 14 arranged on the surface of the circuit board 11, and Fig. 5 is a plan view of the first protective layer 13. In Fig. 5, the light emitting elements 12a to 12d are indicated by dashed lines.

[0025] The first protective layer 13 and the second protective layer 14 are insulating protective films also referred to as solder resist, and are disposed on the surface of the circuit board 11 opposite the surface that is bonded to the mounting substrate 10. The first protective layer 13 is disposed so as to cover portions of the first wiring layer 31, the second wiring layer 32, the third wiring layer 33, the fourth wiring layer 34, and the fifth wiring layer 35, and the second protective layer 14 is disposed so as to cover portions of the first wiring layer 31, the second wiring layer 32, and the fourth wiring layer 34. Four light-emitting elements 12 are disposed in portions of the first wiring layer 31, the second wiring layer 32, the third wiring layer 33, the fourth wiring layer 34, and the fifth wiring layer 35 that are not covered by the first protective layer 13. An anode electrode 21 is formed in a portion of the first wiring layer 31 that is not covered by the second protective layer 14, and a cathode electrode 22 is formed in a portion of the second wiring layer 32 that is not covered by the first protective layer 13.

[0026] The first protective layer 13 has a substantially rectangular planar shape with curved corners. The second protective layer 14 has a frame-like planar shape whose outer edges coincide with the outer edges of the mounting substrate 10 and the circuit board 11, and is disposed so as to surround the first protective layer 13. The outer edge of the first protective layer 13 is spaced a predetermined distance from the inner edge of the second protective layer 14. The space between the outer edge of the first protective layer 13 and the inner edge of the second protective layer 14 forms a recess between the outer edge of the first protective layer 13 and the inner edge of the second protective layer 14. The bottom of the recess formed between the outer edge of the first protective layer 13 and the inner edge of the second protective layer 14 is the surfaces of the first wiring layer 31, the second wiring layer 32, the fourth wiring layer 34, and the circuit board 11.

[0027] The first protective layer 13 has a first opening 41, a second opening 42, a third opening 43, and a fourth opening 44. The light-emitting element 12a is disposed in the first opening 41, the light-emitting element 12b is disposed in the second opening 42, the light-emitting element 12c is disposed in the third opening 43, and the light-emitting element 12d is disposed in the fourth opening 44. The light-emitting element 12a is disposed inside the first opening 41 and is connected to the first wiring layer 31 and the third wiring layer 33, while the light-emitting element 12b is disposed inside the second opening 42 and is connected to the third wiring layer 33 and the fourth wiring layer 34. The light-emitting element 12c is disposed inside the third opening 43 and is connected to the fourth wiring layer 34 and the fifth wiring layer 35, while the light-emitting element 12d is disposed inside the fourth opening 44 and is connected to the fifth wiring layer 35 and the second wiring layer 32.

[0028] The first protective layer 13 has a first protrusion 46, a second protrusion 47, a third protrusion 48, and a fourth protrusion 49. The first protrusion 46 protrudes toward the space formed between the anode 121 and cathode 122 of the light-emitting element 12a at the first opening 41. The second protrusion 47 protrudes toward the space formed between the anode 121 and cathode 122 of the light-emitting element 12b at the second opening 42. The third protrusion 48 protrudes toward the space formed between the anode 121 and cathode 122 of the light-emitting element 12c at the third opening 43. The fourth protrusion 49 protrudes toward the space formed between the anode 121 and cathode 122 of the light-emitting element 12d at the fourth opening 44.

[0029] The light-emitting element 12a is disposed so that its outer edge contacts the tip of the first protrusion 46 in a planar view, and the light-emitting element 12b is disposed so that its outer edge contacts the tip of the second protrusion 47 in a planar view. The light-emitting element 12c is disposed so that its outer edge contacts the tip of the third protrusion 48 in a planar view, and the light-emitting element 12d is disposed so that its outer edge contacts the tip of the fourth protrusion 49 in a planar view.

[0030] The first protrusion 46 and the fourth protrusion 49 protrude from between the adjacent light emitting elements 12a and 12d toward the space formed between the respective anodes 121 and cathodes 122. The second protrusion 47 and the third protrusion 48 protrude from between the adjacent light emitting elements 12b and 12c toward the space formed between the respective anodes 121 and cathodes 122.

[0031] The light-emitting element 12a is arranged close to a pair of sides of the first opening 41 facing the second opening 42 and the fourth opening 44, and is shifted from the center of the first opening 41 toward the center of the first protective layer 13. The light-emitting element 12b is arranged close to a pair of sides of the second opening 42 facing the first opening 41 and the third opening 43, and is shifted from the center of the second opening 42 toward the center of the first protective layer 13. The light-emitting element 12c is arranged close to a pair of sides of the third opening 43 facing the second opening 42 and the fourth opening 44, and is shifted from the center of the third opening 43 toward the center of the first protective layer 13. The light-emitting element 12d is arranged close to a pair of sides of the fourth opening 44 facing the first opening 41 and the third opening 43, and is shifted from the center of the fourth opening 44 toward the center of the first protective layer 13.

[0032] The transparent resin 15 is a solidified adhesive member made of a transparent material such as silicone resin, and bonds the light-emitting element 12 and the phosphor sheet 16 together. The transparent resin 15 is disposed over the entire side surface of the light-emitting section 120 and has a fillet shape that becomes thicker as it approaches the phosphor sheet 16. The transparent resin 15 also has a substantially circular planar shape whose diameter is equal to the length of one side of the phosphor sheet 16. The transparent resin 15 only needs to have a planar shape that contains the light-emitting element 12 and is contained within the phosphor sheet 16. The transparent resin 15 may also have a substantially circular planar shape whose diameter is equal to or greater than the length of the diagonal of the top surface of the light-emitting element 12 and equal to or less than the length of one side of the phosphor sheet 16.

[0033] The phosphor sheet 16 is formed of a translucent resin such as epoxy resin or silicone resin, and contains a yellow phosphor. The phosphor sheet 16 has a rectangular planar shape, and is arranged so that its diagonal line coincides with each of the light-emitting elements 12a to 12d. The length of one side of the phosphor sheet 16 is, for example, 1.7 mm. The yellow phosphor contained in the phosphor sheet 16 is, for example, YAG (Yttrium Aluminum Garnet). The light-emitting device 1 emits white light obtained by mixing blue light from the light-emitting element 12, which is a blue LED, with yellow light obtained by exciting the yellow phosphor with the blue light.

[0034] The phosphor sheet 16 may contain a phosphor other than the yellow phosphor. For example, the phosphor sheet 16 may contain two types of phosphors, a green phosphor and a red phosphor. When the phosphor sheet 16 contains two types of phosphors, a green phosphor and a red phosphor, the light emitting device 1 emits white light obtained by mixing the blue light emitted from the light emitting element 12 with the green light and red light obtained by exciting the green phosphor and the red phosphor with the blue light. The green phosphor is (BaSr) ２ SiO ４ :Eu ２＋ The red phosphor is a particulate phosphor material such as CaAlSiN ３ :Eu ２＋ The phosphor material is a particulate material such as ZnO, which absorbs the blue light emitted by the light emitting element 12 and converts the wavelength of the light into red light.

[0035] The reflector 17 is made of titanium oxide (TiO ２ The reflector 17 is formed from a silicone resin containing a white filler such as acrylic resin, and is arranged so that the outer edge of the end of the first protective layer 13 facing the second protective layer 14 coincides with the outer edge of the end of the first protective layer 13 facing the second protective layer 14. The reflector 17 has an inclined surface extending from the end of the first protective layer 13 facing the second protective layer 14 toward the center at an angle of approximately 15°. The reflector 17 is arranged so as to contact the outer edge of the upper surface of the phosphor sheet 16, and the upper surface of the reflector 17 is flush with the upper surface of the phosphor sheet 16. The reflector 17 is also arranged so as to contact the four light-emitting elements 12a to 12d and the transparent resin 15. The raw material of the reflector 17 before solidification can easily enter the spaces formed between the anodes 121 and cathodes 122 of each of the four light-emitting elements 12a to 12d because the first protective layer 13 has the first protrusions 46, second protrusions 47, third protrusions 48, and fourth protrusions 49.

[0036] (Method of manufacturing light emitting device according to first embodiment) Fig. 6 is a flowchart showing a method of manufacturing the light emitting device 1, Fig. 7 is a diagram showing the light emitting element mounting step shown in Fig. 6, and Fig. 8 is a diagram showing the phosphor sheet mounting step shown in Fig. 6. Figs. 7(a) and 8(a) are perspective views, and Figs. 7(b) and 8(b) are cross-sectional views corresponding to the cross-sectional view taken along line A-A in Fig. 1.

[0037] First, in a substrate preparation step, a substrate is prepared in which the mounting substrate 10, the circuit board 11, the first protective layer 13, and the second protective layer 14 are integrated (S101). Next, in a light emitting element mounting step, four light emitting elements 12a to 12d are mounted on the substrate prepared in the substrate preparation step (S102). Each of the four light emitting elements 12a to 12d is connected to a first wiring layer 31, a second wiring layer 32, a third wiring layer 33, a fourth wiring layer 34, and a fifth wiring layer 35, respectively, by a conductive bonding material such as solder.

[0038] Next, in a phosphor sheet mounting step, phosphor sheet 16 is mounted on the upper surfaces of four light-emitting elements 12a to 12d (S103). In the phosphor sheet mounting step, first, raw material of transparent resin 15 before solidification is applied to the upper surfaces of four light-emitting elements 12a to 12d. Next, phosphor sheet 16 is placed on the upper surfaces of four light-emitting elements 12a to 12d to which the raw material of transparent resin 15 before solidification has been applied. Then, as mounting substrate 10 is heated, the raw material of transparent resin 15 solidifies, and phosphor sheet 16 is mounted on the upper surfaces of four light-emitting elements 12a to 12d via transparent resin 15.

[0039] Next, in a reflective material raw material placement step, the raw material of the reflective material 17 before solidification is applied (S104). The raw material of the reflective material 17 before solidification is placed so as to cover the surface of the first protective layer 13.

[0040] Next, in the reflective material solidification step, the unsolidified raw material of the reflective material 17 applied in the reflective material raw material placement step is solidified in response to heating of the mounting substrate 10 (S105). As the mounting substrate 10 is heated, the temperature of the unsolidified raw material of the reflective material 17 increases. As the temperature increases, the unsolidified raw material of the reflective material 17 penetrates into the spaces formed between the anodes 121 and cathodes 122 of the light-emitting elements 12a to 12d via the first protrusion 46, the second protrusion 47, the third protrusion 48, and the fourth protrusion 49. The unsolidified raw material of the reflective material 17 that has penetrated around the light-emitting elements 12a to 12d solidifies to form a surface flush with the phosphor sheet 16 due to surface tension generated between the raw material and the outer edge of the phosphor sheet 16. Furthermore, the unsolidified raw material of the reflective material 17 solidifies to coincide with the outer edge of the first protective layer 13 due to surface tension generated between the raw material and the outer edge of the first protective layer 13.

[0041] (Actions and Effects of the Light-Emitting Device According to the First Embodiment) The light-emitting device 1 has a first protective layer 13 arranged to surround the periphery of the light-emitting elements 12a to 12d, and a second protective layer 14 arranged to surround the first protective layer 13, and the reflective material 17 is arranged so that its outer edge coincides with that of the first protective layer 13. The raw material of the reflective material 17 before solidification is arranged so that its outer edge coincides with that of the first protective layer 13 due to surface tension, so that the reflective material 17 can be arranged without placing a dam material around the area where the raw material of the reflective material 17 before solidification is applied. Because the light-emitting device 1 does not require a dam material, the manufacturing costs can be reduced compared to conventional light-emitting devices that require a dam material.

[0042] Furthermore, in light emitting device 1, fillet-shaped transparent resin 15 is arranged along the side surfaces of light emitting sections 120 of light emitting elements 12a to 12d, so that light emitted from light emitting sections 120 is incident over a wide range on phosphor sheet 16. Light emitting device 1 can emit light having a light-emitting area wider than the surface of light emitting elements 12a to 12d by allowing light emitted from light emitting sections 120 to be incident over a wide range on phosphor sheet 16.

[0043] Furthermore, since the light emitting device 1 has the first to fourth protrusions 46 to 49, the raw material of the reflective material 17 before solidification penetrates into the space formed between the anode 121 and cathode 122 of the light emitting elements 12a to 12d via the first to fourth protrusions 46 to 49. The light emitting device 1 can fill the space formed between the anode 121 and cathode 122 with the reflective material 17 by penetrating into the space formed between the anode 121 and cathode 122 of the light emitting elements 12a to 12d via the first to fourth protrusions 46 to 49.

[0044] (Configuration and function of the light-emitting device according to the second embodiment) Figure 9(a) is a perspective view of the light-emitting device according to the second embodiment, Figure 9(b) is a plan view of the light-emitting device shown in Figure 9(a), and Figure 9(c) is a cross-sectional view along line B-B shown in Figure 9(a).

[0045] The light emitting device 2 differs from the light emitting device 1 in that it has a circuit board 50 and a single light emitting element 12 instead of the circuit board 11 and four light emitting elements 12a to 12d. The light emitting device 2 also differs from the light emitting device 1 in that it has a first protective layer 13a, a second protective layer 14a, and a reflector 17a instead of the first protective layer 13, the second protective layer 14, and the reflector 17. The configurations and functions of the components of the light emitting device 2 other than the circuit board 50, the light emitting element 12, the first protective layer 13a, the second protective layer 14a, and the reflector 17a are the same as the configurations and functions of the components of the light emitting device 1 that are assigned the same reference numerals, and therefore will not be described in detail here.

[0046] The circuit board 50 differs from the circuit board 11 in that it has a first wiring layer 36 and a second wiring layer 37 instead of the first wiring layer 31 to the fifth wiring layer 35. The configuration and functions of the circuit board 50 other than the first wiring layer 36 and the second wiring layer 37 are the same as those of the circuit board 11, and therefore detailed description thereof will be omitted here.

[0047] The first wiring layer 36 is connected to the anode 121 of the light-emitting element 12, and the second wiring layer 37 is connected to the cathode 122 of the light-emitting element 12. The light-emitting element 12 emits blue light in response to a forward voltage being applied between the anode electrode 21 and the cathode electrode 22.

[0048] The first protective layer 13a and the second protective layer 14a are insulating protective films, similar to the first protective layer 13 and the second protective layer 14. The first protective layer 13a has a substantially rectangular planar shape with curved corners, similar to the first protective layer 13. The first protective layer 13a has an opening in which the light-emitting element 12 is disposed. The first protective layer 13a has a protrusion that protrudes into the space formed between the anode 121 and cathode 122 of the light-emitting element 12 disposed in the opening.

[0049] The second protective layer 14a is disposed so as to cover the first wiring layer 36 electrically connected to the anode 121 of the light-emitting element 12 and the second wiring layer 37 electrically connected to the cathode 122 of the light-emitting element 12. Similar to the second protective layer 14, the second protective layer 14a has a frame-like planar shape whose outer edges coincide with the outer edges of the mounting substrate 10 and the circuit board 50, and is disposed so as to surround the first protective layer 13a. The outer edge of the first protective layer 13a is spaced a predetermined distance from the inner edge of the second protective layer 14a. The reflective material 17a is formed from the same material as the reflective material 17, and is disposed so that its outer edge coincides with the outer edge of the end of the first protective layer 13a facing the second protective layer 14a.

[0050] The method for manufacturing the light emitting device 2 is the same as the method for manufacturing the light emitting device 1 described with reference to FIGS. 6 to 8, and therefore a detailed description thereof will be omitted here.

[0051] (Configuration and Function of Light Emitting Device According to Third Embodiment) Fig. 10 is a perspective view of a light emitting device according to a third embodiment. The light emitting device 3 according to the third embodiment is a light emitting device capable of adjusting color.

[0052] The light emitting device 3 differs from the light emitting device 1 in that it has a circuit board 51, a pair of first phosphor sheets 52, and a pair of second phosphor sheets 53 instead of the circuit board 11 and four phosphor sheets 16. The configurations and functions of the components of the light emitting device 3 other than the circuit board 51, the pair of first phosphor sheets 52, and the pair of second phosphor sheets 53 are the same as the configurations and functions of the components of the light emitting device 1 with the same reference numerals, and therefore detailed description thereof will be omitted here. The pair of first phosphor sheets 52 and the pair of second phosphor sheets 53 are collectively referred to as phosphor sheets.

[0053] The circuit board 51 differs from the circuit board 11 in that it has a first anode electrode 21a, a first cathode electrode 22a, a second anode electrode 21b, and a second cathode electrode 22b instead of the anode electrode 21 and the cathode electrode 22. The first anode electrode 21a and the first cathode electrode 22a are electrically connected, via a wiring layer (not shown), to a pair of light-emitting elements 12a and 12c to which a first phosphor sheet 52 is adhered. The second anode electrode 21b and the second cathode electrode 22b are electrically connected, via a wiring layer (not shown), to a pair of light-emitting elements 12b and 12d to which a second phosphor sheet 53 is adhered.

[0054] The pair of first phosphor sheets 52 contains two types of phosphors, green and red, and emits warm light obtained by mixing the blue light from the pair of light-emitting elements 12 a and 12 c with light obtained by exciting the green and red phosphors with the blue light. The color temperature of the warm light emitted from the pair of first phosphor sheets 52 is, for example, 2700 K.

[0055] The pair of second phosphor sheets 53 contains a yellow phosphor and emits cool light obtained by mixing the blue light from the pair of light-emitting elements 12 b and 12 d with light obtained by exciting the yellow phosphor with the blue light. The color temperature of the cool light emitted from the pair of second phosphor sheets 53 is, for example, 6500 K.

[0056] The light emitting device 3 can adjust the ratio between the current supplied to the light emitting elements 12a and 12c via the first anode electrode 21a and the first cathode electrode 22a and the current supplied to the light emitting elements 12b and 12d via the second anode electrode 21b and the second cathode electrode 22b. The light emitting device 3 can perform dimming processing to emit light having a desired color temperature by adjusting the ratio between the current supplied to the light emitting elements 12a and 12c and the current supplied to the light emitting elements 12b and 12d.

[0057] The method for manufacturing the light emitting device 3 is the same as the method for manufacturing the light emitting device 1 described with reference to FIGS. 6 to 8, and therefore a detailed description thereof will be omitted here.

[0058] (Configuration and Function of Light Emitting Device According to Fourth Embodiment) Fig. 11 is a perspective view of a light emitting device according to a fourth embodiment. The light emitting device 4 according to the fourth embodiment is a linear light emitting device.

[0059] Light emitting device 4 differs from light emitting device 1 in that it has a mounting substrate 54, a circuit board 55, and eight light emitting elements 12 instead of mounting substrate 10, circuit board 11, and four light emitting elements 12a to 12d. Light emitting device 4 also differs from light emitting device 1 in that it has a first protective layer 56, a second protective layer 57, a third protective layer 58, and a reflector 59 instead of first protective layer 13, second protective layer 14, and reflector 17. The configurations and functions of the components of light emitting device 4 other than mounting substrate 54 to reflector 59 and eight light emitting elements 12 are the same as the configurations and functions of the components of light emitting device 1 with the same reference numerals, and therefore will not be described in detail here.

[0060] The mounting substrate 54 and the circuit board 55 have a rectangular planar shape having a pair of short sides and a pair of long sides, and are made of the same material as the mounting substrate 10 and the circuit board 11, respectively. The circuit board 55 has, on its surface, a first wiring layer electrically connected to the anodes of the light-emitting elements 12, a second wiring layer electrically connected to the cathodes of the light-emitting elements 12, and a plurality of wiring layers connecting the eight light-emitting elements 12 in series. The anode electrode 23 is formed on the first wiring layer, and the cathode electrode 24 is formed on the second wiring layer. The eight light-emitting elements 12 are connected in series between the anode electrode 23 and the cathode electrode 24 via the first wiring layer, the second wiring layer, and a plurality of wiring layers arranged on the surface of the circuit board 55.

[0061] The first protective layer 56 to the third protective layer 58 are insulating protective films, similar to the first protective layer 13 and the second protective layer 14. The first protective layer 56 has a rectangular planar shape and is disposed so as to surround the eight light-emitting elements and cover the first wiring layer, the second wiring layer, and the multiple wiring layers disposed on the surface of the circuit board 55. The longitudinal ends of the first protective layer 56 coincide with the longitudinal ends of the circuit board 55, one lateral end of the first protective layer 56 faces the second protective layer 57, and the other lateral end of the first protective layer 56 faces the third protective layer 58. The first protective layer 56 has eight openings formed therein, in which the eight light-emitting elements 12 are disposed. The first protective layer 56 has eight protrusions protruding toward the spaces formed between the anodes 121 and cathodes 122 of the light-emitting elements 12 disposed in the eight openings.

[0062] The second protective layer 57 is disposed in contact with one of the pair of short sides of the circuit board 55 and covers the first wiring layer electrically connected to the anode of the light-emitting element 12. The third protective layer 58 is disposed in contact with the other of the pair of short sides of the circuit board 55 and covers the second wiring layer electrically connected to the cathode of the light-emitting element 12.

[0063] The reflective material 59 is made of the same material as the reflective material 17 and is arranged to cover the central portion of the circuit board 55, the first protective layer 56, and the eight light-emitting elements 12. The outer edge of the reflective material 59 coincides with the outer edge of the end of the first protective layer 56 that faces the second protective layer 57 and the third protective layer 58, and also coincides with a pair of long sides of the circuit board 55. One end of the reflective material 59 in the longitudinal direction coincides with the end of the first protective layer 56 that faces the second protective layer 57, and the other end of the reflective material 59 in the longitudinal direction coincides with the end of the first protective layer 56 that faces the third protective layer 58. The ends of the reflective material 59 extending in the longitudinal direction coincide with the pair of long sides of the circuit board 55.

[0064] The method for manufacturing the light emitting device 4 is the same as the method for manufacturing the light emitting device 1 described with reference to FIGS. 6 to 8, and therefore a detailed description thereof will be omitted here.

[0065] 12 is a perspective view of a light emitting device according to a fifth embodiment. The light emitting device 5 according to the fifth embodiment is a surface light emitting device, and multiple lenses corresponding to the light emitting elements 12 can be arranged.

[0066] Light emitting device 5 differs from light emitting device 1 in that it has a circuit board 60 and 21 light emitting elements 12 instead of circuit board 11 and four light emitting elements 12a to 12d. Light emitting device 5 also differs from light emitting device 1 in that it has a first protective layer 61, a second protective layer 62, a third protective layer 63, a fourth protective layer 64, a fifth protective layer 65, and a reflector 66 instead of first protective layer 13, second protective layer 14, and reflector 17. The configurations and functions of the components of light emitting device 5 other than circuit board 60 to reflector 66 and 21 light emitting elements 12 are the same as the configurations and functions of the components of light emitting device 1 with the same reference numerals, and therefore detailed description thereof will be omitted here.

[0067] The circuit board 60 has a substantially rectangular planar shape with a pair of notches 61a and 61b formed at a pair of opposing corners. The circuit board 60 has, on its surface, a first wiring layer electrically connected to the anodes of the light-emitting elements 12, a second wiring layer electrically connected to the cathodes of the light-emitting elements 12, and multiple wiring layers that connect the 21 light-emitting elements 12 in series and parallel. The anode electrode 25 and the cathode electrode 26 are electrically connected to the 21 light-emitting elements 12 via the first wiring layer, the second wiring layer, and multiple wiring layers arranged on the surface of the circuit board 60. The 21 light-emitting elements 12 are arranged in an array and connected in series and parallel between the anode electrode 25 and the cathode electrode 26. For example, the 21 light-emitting elements 12 form three light-emitting element rows, each with seven light-emitting elements 12 connected in series.

[0068] The first protective layer 61 to the fifth protective layer 65 are insulating protective films, similar to the first protective layer 13 and the second protective layer 14. The first protective layer 61 is arranged to cover the surface of the circuit board 60 except for the four corners. The first protective layer 61 is arranged to surround the 21 light-emitting elements and to cover the first wiring layer, the second wiring layer, and multiple wiring layers arranged on the surface of the circuit board 60. The outer edges of the first protective layer 61 coincide with the four sides of the circuit board 60 and are arranged to face each of the second protective layers 62 to the fifth protective layer 65. The first protective layer 61 has 21 openings in which the 21 light-emitting elements 12 are arranged. The first protective layer 61 has 21 protrusions that protrude toward the space formed between the anode 121 and cathode 122 of the light-emitting elements 12 arranged in the 21 openings. The 21 protrusions protrude from between adjacent light-emitting elements 12 toward the space formed between the anode 121 and cathode 122 of each light-emitting element 12.

[0069] The second protective layer 62 to the fifth protective layer 65 are disposed at a distance from the first protective layer so as to contact the four corners of the circuit board 60. The anode electrode 25 is disposed on the second protective layer 62, and the cathode electrode 26 is disposed on the third protective layer 63. The fourth protective layer 64 is disposed at the corner where the notch 61a is formed, and the fifth protective layer 65 is disposed at the corner where the notch 61b is formed.

[0070] The reflective material 66 is made of the same material as the reflective material 17, and is arranged so as to cover the surface of the circuit board 60 excluding the four corners, the first protective layer 61, and the 21 light-emitting elements 12. The outer edge of the reflective material 66 coincides with the outer edge of the end of the first protective layer 61 facing the second protective layer 62 to the fifth protective layer 65, and also coincides with the four sides of the circuit board 67. Each of the four corners of the reflective material 66 coincides with the end of the first protective layer 61 facing the second protective layer 62 to the fifth protective layer 65, and the four sides of the reflective material 66 coincide with the four sides of the circuit board 60.

[0071] The method for manufacturing the light emitting device 5 is the same as the method for manufacturing the light emitting device 1 described with reference to FIGS. 6 to 8, and therefore a detailed description thereof will be omitted here.

[0072] (Configuration and Function of Light-Emitting Device According to Sixth Embodiment) Fig. 13 is a perspective view of a light-emitting device according to a sixth embodiment. The light-emitting device 6 according to the sixth embodiment is a light-emitting device for use in an illumination device having an arc-shaped planar shape.

[0073] The light emitting device 6 differs from the light emitting device 1 in that it has a mounting substrate 70, a circuit board 71, and twelve light emitting elements 12 instead of the mounting substrate 10, the circuit board 11, and four light emitting elements 12a to 12d. The light emitting device 6 also differs from the light emitting device 1 in that it has a first protective layer 72, a second protective layer 73, a third protective layer 74, and a reflector 75 instead of the first protective layer 13, the second protective layer 14, and the reflector 17. The light emitting device 6 also differs from the light emitting device 1 in that it has a connector 76. The configurations and functions of the components of the light emitting device 6 other than the mounting substrate 70 to the connector 76 and the twelve light emitting elements 12 are the same as the configurations and functions of the components of the light emitting device 1 with the same reference numerals, and therefore detailed description thereof will be omitted here.

[0074] The mounting substrate 70 and the circuit board 71 have a substantially circular planar shape with notches 71a, 71b, and 71c that are offset from each other by 120°, and are made of the same material as the mounting substrate 10 and the circuit board 11, respectively. The circuit board 71 has, on its surface, a first wiring layer electrically connected to the anodes of the light-emitting elements 12, a second wiring layer electrically connected to the cathodes of the light-emitting elements 12, and multiple wiring layers that connect the 12 light-emitting elements 12 in series and parallel. The anode electrode 27 and the cathode electrode 28 are electrically connected to the 12 light-emitting elements 12 via the first wiring layer, the second wiring layer, and multiple wiring layers arranged on the surface of the circuit board 71. The 12 light-emitting elements 12 are connected in series and parallel between the anode electrode 27 and the cathode electrode 28. For example, the 12 light-emitting elements 12 form two light-emitting element rows, each with six light-emitting elements 12 connected in series.

[0075] The first to third protective layers 72 to 74 are insulating protective films, similar to the first protective layer 13 and the second protective layer 14. The first protective layer 72 has a ring-shaped planar shape and is disposed so as to surround the twelve light-emitting elements and cover the first wiring layer, the second wiring layer, and multiple wiring layers disposed on the surface of the circuit board 71. The first protective layer 72 has twelve openings formed therein, in which the twelve light-emitting elements 12 are disposed. The first protective layer 72 has twelve protrusions that protrude into the spaces formed between the anodes 121 and cathodes 122 of the light-emitting elements 12 disposed in the twelve openings.

[0076] The second protective layer 73 has a circular planar shape and is disposed inside the first protective layer 72. The third protective layer 74 has a substantially ring-shaped planar shape and is disposed outside the first protective layer 72. The second protective layer 73 and the third protective layer 74 are disposed spaced apart from the first protective layer 72.

[0077] The reflective material 75 is made of the same material as the reflective material 17 and is arranged to cover the surface of the circuit board 71, the first protective layer 72, and the twelve light-emitting elements 12. The inner edge of the reflective material 75 coincides with the inner edge of the first protective layer 72 and faces the outer edge of the second protective layer 73. The outer edge of the reflective material 75 coincides with the outer edge of the first protective layer 72 and faces the inner edge of the third protective layer 74.

[0078] The connector 76 is electrically connected to each of the anode electrode 27 and the cathode electrode 28, and can also be electrically connected to an external power supply (not shown). When electrically connected to the external power supply (not shown), the connector 76 supplies current from the external power supply (not shown) to the twelve light-emitting elements 12 via the anode electrode 27 and the cathode electrode 28.

[0079] The method for manufacturing the light emitting device 6 is the same as the method for manufacturing the light emitting device 1 described with reference to FIGS. 6 to 8, and therefore a detailed description thereof will be omitted here.

[0080] (Configuration and Function of Light-Emitting Device According to Seventh Embodiment) Fig. 14 is a perspective view of a light-emitting device according to a seventh embodiment. The light-emitting device 7 according to the seventh embodiment is a light-emitting device in which a light guide layer is disposed on a reflector.

[0081] The light emitting device 7 differs from the light emitting device 3 in that it includes a second reflecting material 77, a light guiding layer 78, and electronic components 79. The configurations and functions of the components of the light emitting device 7 other than the second reflecting material 77, the light guiding layer 78, and the electronic components 79 are the same as the configurations and functions of the components of the light emitting device 3 that are assigned the same reference numerals, and therefore detailed description thereof will be omitted here.

[0082] The second reflector 77, like the reflector 17, is formed of a silicone resin containing a white filler such as titanium oxide and is arranged to surround the reflector 17. The light-guiding layer 78 is formed of a transparent synthetic resin such as a silicone resin and is arranged to cover the reflector 17. The thickness T between the surface of the LED die of the light-emitting element 12a and the surface of the light-guiding layer 78 is preferably 1 mm or more and 1.5 mm or less. The electronic component 79 is a pair of jumper resistors. One of the electronic components 79 electrically connects the first anode electrode 21a, the first cathode electrode 22a, and the light-emitting elements 12a and 12c, and the other of the electronic components 79 electrically connects the second anode electrode 21b, the second cathode electrode 22b, and the light-emitting elements 12b and 12d. Note that the electronic component 79 may be an electronic component other than a jumper resistor, such as a Zener diode.

[0083] The manufacturing method of the light emitting device 7 other than the second reflective material 77, the light guide layer 78, and the electronic components 79 is the same as the manufacturing method of the light emitting device 1 described with reference to Figures 6 to 8, and therefore a detailed description thereof will be omitted here. The second reflective material 77 is formed by arranging the material of the second reflective material 77 before solidification around the reflective material 17, and then heating the mounting substrate 10. The light guide layer 78 is formed by filling the area surrounded by the reflective material 17 with the material of the light guide layer 78 before solidification, and then heating the mounting substrate 10.

[0084] FIG. 15 is a perspective view of a light emitting device according to a first modified example of the seventh embodiment, and FIG. 16 is an exploded perspective view of the light emitting device shown in FIG.

[0085] The light emitting device 7a differs from the light emitting device 7 in that it has a light guide layer 80 instead of the second reflector 77 and the light guide layer 78. The configurations and functions of the components of the light emitting device 7a other than the light guide layer 80 are the same as the configurations and functions of the components of the light emitting device 3 with the same reference numerals, and therefore detailed description thereof will be omitted here.

[0086] The light-guiding layer 80 is a transparent sheet material formed from a transparent synthetic resin such as silicone resin, and it is preferable that the thickness T between the surface of the LED die of the light-emitting element 12a and the surface of the light-guiding layer 80 is 1 mm or more and 1.5 mm or less.

[0087] The manufacturing method of the light emitting device 7a other than the light guide layer 80 is the same as the manufacturing method of the light emitting device 1 described with reference to Figures 6 to 8, so a detailed description will be omitted here. The light emitting device 7a is formed by attaching the light guide layer 80 to the surface of the reflector 17. The light guide layer 80 may be attached by applying a light-transmitting adhesive to the surface of the reflector 17.

[0088] FIG. 17 is a perspective view of a light emitting device according to a second modification of the seventh embodiment.

[0089] Light-emitting device 7b differs from light-emitting device 7 in that it has a light-guiding layer 81 instead of second reflector 77 and light-guiding layer 78. The configurations and functions of the components of light-emitting device 7b other than light-guiding layer 81 are the same as the configurations and functions of the components of light-emitting device 3 with the same reference numerals, and therefore detailed description thereof will be omitted here.

[0090] Like the light guide layer 80, the light guide layer 81 is a transparent sheet material made of a transparent synthetic resin such as silicone resin, and is arranged to cover the top of the reflector 17. The light guide layer 81 preferably has a thickness T between the surface of the LED die of the light emitting element 12a and the surface of the light guide layer 81 of 1 mm or more and 1.5 mm or less.

[0091] The manufacturing method of the light emitting device 7b other than the light guide layer 81 is the same as the manufacturing method of the light emitting device 1 described with reference to Figures 6 to 8, so a detailed description will be omitted here. The light guiding layer 81, like the light guiding layer 81, is attached to the surface of the reflector 17 to form the light emitting device 7b. The light guiding layer 81 may be attached by applying a light-transmitting adhesive to the surface of the reflector 17.

[0092] (Configuration and Function of Light-Emitting Device According to Eighth Embodiment) FIG. 18 is a perspective view of a light-emitting device according to an eighth embodiment, and FIG. 19 is a cross-sectional view taken along line BB shown in FIG.

[0093] Light emitting device 8 differs from light emitting device 1 in that it has four chromaticity change units 18a to 18d. Light emitting device 8 emits white light in response to a voltage being applied to an anode electrode 21 and a cathode electrode 22 formed on circuit board 11. Light emitting elements 12a to 12d are collectively referred to as light emitting element 12, and chromaticity change units 18a to 18d are collectively referred to as chromaticity change unit 18. The configurations and functions of the components of light emitting device 8 other than chromaticity change unit 18 are the same as the configurations and functions of the components of light emitting device 1 that are assigned the same reference numerals, and therefore detailed description thereof will be omitted here.

[0094] FIG. 20 is a plan view of the upper surface of the reflector 17 shown in FIG.

[0095] Each of the four chromaticity changing units 18a to 18d has a synthetic resin such as silicone resin and a diffusing material such as titanium oxide contained in the synthetic resin, and is arranged on the surface of each of the four phosphor sheets 16. Each of the chromaticity changing units 18a to 18d has an area smaller than that of the phosphor sheet 16, and has, for example, a substantially circular planar shape with a diameter of 300 μm to 500 μm, and each of the chromaticity changing units 18a to 18d has a thickness of 50 μm or less. Each of the chromaticity changing units 18a to 18d is arranged along a diagonal line 16a of the phosphor sheet 16.

[0096] Each of the four chromaticity change units 18a to 18d scatters the blue light emitted from each of the four light emitting elements 12a to 12d and a portion of the yellow light emitted from the phosphors contained in the phosphor sheet 16 on the surface of the phosphor sheet 16. By changing the positions of each of the chromaticity change units 18a to 18d that scatter a portion of the blue light and yellow light on the surface of the phosphor sheet 16, the chromaticity of the white light emitted from the surface of the phosphor sheet 16 is adjusted.

[0097] Fig. 21(a) shows a first example of the arrangement of the chromaticity modification unit 18, Fig. 21(b) shows a second example of the arrangement of the chromaticity modification unit 18, Fig. 21(c) shows a third example of the arrangement of the chromaticity modification unit 18, Fig. 21(d) shows a fourth example of the arrangement of the chromaticity modification unit 18, Fig. 21(e) shows a fifth example of the arrangement of the chromaticity modification unit 18, and Fig. 21(f) shows a sixth example of the arrangement of the chromaticity modification unit 18.

[0098] 21( a), the chromaticity change unit 18 is disposed at the center of the light emitting element 12 and the phosphor sheet 16. In the first arrangement example, the chromaticity change unit 18 is disposed directly above the light emitting element 12, which emits the blue light with the highest luminous intensity, and therefore the luminance of the blue light emitted from the surface of the phosphor sheet 16 is significantly reduced. In the first arrangement example, the chromaticity change unit 18 is disposed at the center of the light emitting element 12 and the phosphor sheet 16, thereby reducing the luminance of the blue light emitted from the surface of the phosphor sheet 16 and shifting the chromaticity of the white light emitted from the surface of the phosphor sheet 16 toward yellow.

[0099] 21(b), the chromaticity change unit 18 is disposed midway between the center of the light-emitting element 12 and the phosphor sheet 16 and the corner of the light-emitting element 12. In the second arrangement example, the chromaticity change unit 18 is disposed offset from directly above the light-emitting element 12, which has the highest luminous intensity of blue light, and therefore the amount of reduction in the luminance of blue light is smaller than in the first arrangement example. In the second arrangement example, the amount of reduction in the luminance of blue light is smaller than in the first arrangement example, and therefore the amount of shift in the chromaticity of white light emitted from the surface of the phosphor sheet 16 toward yellow is smaller than the amount of shift in the chromaticity of white light toward yellow in the first arrangement example.

[0100] In a third arrangement example shown in FIG. 21( c), the chromaticity changer 18 is arranged to cover the corners of the light-emitting element 12. In the third arrangement example, in a plan view, a portion of the chromaticity changer 18 overlaps the light-emitting element 12, and another portion of the chromaticity changer 18 overlaps the transparent resin 15. In the third arrangement example, the chromaticity changer 18 is arranged further away from directly above the light-emitting element 12, which has the highest luminous intensity of blue light, than in the second arrangement example. Therefore, the reduction in the luminance of blue light is smaller in the third arrangement example than in the second arrangement example. Because the reduction in the luminance of blue light is smaller in the third arrangement example than in the second arrangement example, the amount of shift in the chromaticity of white light emitted from the surface of the phosphor sheet 16 toward yellow is smaller than the amount of shift in the chromaticity of white light toward yellow in the second arrangement example.

[0101] In the fourth arrangement example shown in FIG. 21( d ), the chromaticity change unit 18 is shifted toward the adjacent corner of the phosphor sheet 16 more than in the third arrangement example and is positioned to cover the corner of the light-emitting element 12. In the fourth arrangement example, in a plan view, a portion of the chromaticity change unit 18 overlaps the light-emitting element 12, another portion of the chromaticity change unit 18 overlaps the transparent resin 15, and yet another portion of the chromaticity change unit 18 overlaps the reflector 17. In the fourth arrangement example, the chromaticity change unit 18 is positioned further away from directly above the light-emitting element 12, which has the highest blue light intensity, than in the third arrangement example, so the reduction in the luminance of blue light is smaller than in the third arrangement example. In the fourth arrangement example, the reduction in the luminance of blue light is smaller than in the third arrangement example, so the shift in the chromaticity of white light emitted from the surface of the phosphor sheet 16 toward yellow is smaller than the shift in the chromaticity of white light toward yellow in the third arrangement example.

[0102] In the fifth arrangement example shown in FIG. 21( e), the chromaticity change unit 18 is disposed between the adjacent corners of the light-emitting element 12 and the phosphor sheet 16. In the fifth arrangement example, in a plan view, the chromaticity change unit 18 does not overlap the light-emitting element 12, but rather a portion of the chromaticity change unit 18 overlaps the transparent resin 15, and another portion of the chromaticity change unit 18 overlaps the reflector 17. In the fifth arrangement example, the chromaticity change unit 18 is disposed further away from directly above the light-emitting element 12, which has the highest blue light intensity, than in the fourth arrangement example. Therefore, the reduction in the luminance of blue light is smaller in the fifth arrangement example than in the fourth arrangement example. Because the reduction in the luminance of blue light is smaller in the fifth arrangement example than in the fourth arrangement example, the amount of shift in the chromaticity of white light emitted from the surface of the phosphor sheet 16 toward yellow is smaller than the amount of shift in the chromaticity of white light toward yellow in the fourth arrangement example.

[0103] In the sixth arrangement example shown in FIG. 21( f), the chromaticity change unit 18 is arranged to cover the corners of the phosphor sheet 16. In the sixth arrangement example, in a planar view, the chromaticity change unit 18 does not overlap the light-emitting element 12, but rather a portion of the chromaticity change unit 18 overlaps the phosphor sheet 16, while the other portion of the chromaticity change unit 18 does not overlap the phosphor sheet 16. In the sixth arrangement example, the chromaticity change unit 18 is arranged further away from directly above the light-emitting element 12 that has the highest blue light intensity than in the fifth arrangement example, so the reduction in the luminance of the blue light is smaller than in the fifth arrangement example, and is approximately zero. In the sixth arrangement example, the reduction in the luminance of the blue light is approximately zero, so the shift in the chromaticity of the white light emitted from the surface of the phosphor sheet 16 toward yellow is approximately zero.

[0104] 22 is a flowchart showing a method for manufacturing the light emitting device 8. The processes of S201 to S205 are the same as the processes of S101 to S105, and therefore detailed description thereof will be omitted here.

[0105] Following the reflective material solidification step S205, in a mixed light measurement step, a threshold voltage is applied between the first wiring layer 31 and the second wiring layer 32 via the anode electrode 21 and the cathode electrode 22, and the chromaticity of the mixed light, which is a mixture of blue light and yellow light emitted from the phosphor sheet 16, is measured (S206). The chromaticity of the mixed light emitted from the phosphor sheet 16 is measured by a spectroscope.

[0106] Next, in a chromaticity modification unit position determination step, the positions at which each of the chromaticity modification units 18a-18d is to be disposed on the surface of the phosphor sheet 16 are determined based on the chromaticity difference between the chromaticity of the mixed light measured in the process of S206 and the target chromaticity of the mixed light (S207). The positions at which each of the chromaticity modification units 18a-18d is to be disposed are determined, for example, by referring to a position table that indicates the correspondence between the chromaticity difference between the measured chromaticity of the mixed light and the target chromaticity of the mixed light and the positions at which each of the chromaticity modification units 18a-18d is to be disposed. The position table describes the correspondence between the chromaticity difference between the measured chromaticity of the mixed light and the target chromaticity of the mixed light and the distance from the center of the light-emitting element 12.

[0107] Then, in a chromaticity change unit arrangement step, each of the chromaticity change units 18a to 18d is arranged at the position determined in the process of S207 (S208), thereby completing the manufacturing process of the light emitting device 8. First, the raw material of the chromaticity change units 18a to 18d before solidification is applied to the surface of the phosphor sheet 16 at the position determined in the process of S207. Then, as the mounting substrate 10 is heated, the raw material of the chromaticity change units 18a to 18d solidifies, and the chromaticity change units 18a to 18d are arranged on the surface of the phosphor sheet 16.

[0108] (Effects of the Light-Emitting Device According to the Eighth Embodiment) In the light-emitting device 8, the chromaticity changers 18a to 18d are arranged along the diagonals of the phosphor sheet 16, which allows for a wider range of chromaticity adjustment than when the chromaticity changers are arranged along a direction parallel to the sides from the center of the phosphor sheet 16. In the light-emitting device 8, the chromaticity changers 18a to 18d are arranged so as not to overlap the light-emitting elements 12a to 12d in a planar view, which allows for an even wider range of chromaticity adjustment. Furthermore, in the light-emitting device 8, the chromaticity changers 18a to 18d are arranged so as not to overlap the phosphor sheet 16 in a planar view, which allows for a wider range of chromaticity adjustment, up to the amount of chromaticity adjustment reaching approximately zero.

[0109] FIG. 23( a) is a diagram (part 1) showing a comparison of the chromaticity adjustment range of the light-emitting device 8 with that of a light-emitting device according to a comparative example, and FIG. 23( b) is a diagram (part 2) showing a comparison of the chromaticity adjustment range of the light-emitting device 8 with that of a light-emitting device according to a comparative example. FIG. 23( a) shows a case where the color temperature is 2700 K and the general color rendering index (Ra) is 90, and FIG. 23( b) shows a case where the color temperature is 6500 K and the general color rendering index (Ra) is 90. In the light-emitting device according to the comparative example, the chromaticity change unit 18 is disposed in a direction parallel to the side from the center of the phosphor sheet 16. In FIGS. 23( a) and 23(b), the horizontal axis represents the distance from the center of the light-emitting element 12, and the vertical axis represents the chromaticity difference Δx between the chromaticity coordinate x on the CIE chromaticity diagram and the chromaticity coordinate x when the chromaticity change unit 18 is not disposed. In addition, in Figure 23(a), W101 indicates the chromaticity difference of light-emitting device 8, and W102 indicates the chromaticity difference of the light-emitting device according to the comparative example. In Figure 23(b), W201 indicates the chromaticity difference of light-emitting device 8, and W202 indicates the chromaticity difference of the light-emitting device according to the comparative example.

[0110] When the temperature is 2700 K, which is a warm color, the chromaticity difference Δx adjustable by the light-emitting device according to the comparative example is in the range of 0.006 to 0.012, while the chromaticity difference Δx adjustable by the light-emitting device 1 is in the range of 0.002 to 0.012. When the temperature is 6500 K, which is a warm color, the chromaticity difference Δx adjustable by the light-emitting device according to the comparative example is in the range of 0.006 to 0.013, while the chromaticity difference Δx adjustable by the light-emitting device 8 is in the range of 0.002 to 0.013. The light-emitting device 8 can adjust the chromaticity over a wider range than the light-emitting device according to the comparative example. Note that, as in the sixth arrangement example shown in FIG. 21( f ), by arranging the chromaticity change unit 18 so as to cover the corners of the phosphor sheet 16, the chromaticity difference Δx adjustable by the light-emitting device 8 is expanded to the range of 0.000 to 0.013.

[0111] (Configuration and Function of Light-Emitting Device According to First Modification of Eighth Embodiment) FIG. 24 is a plan view of the upper surface of the reflector of a light-emitting device according to a first modification of the eighth embodiment.

[0112] A light-emitting device 8a according to a first modification of the eighth embodiment differs from the light-emitting device 8 in that it has first chromaticity modification units 181a-181d and second chromaticity modification units 191a-191d instead of the chromaticity modification units 18a-18d. The first chromaticity modification units 181a-181d are collectively referred to as the first chromaticity modification unit 181, and the second chromaticity modification units 191a-191d are collectively referred to as the second chromaticity modification unit 191. The configurations and functions of the components of the light-emitting device 8a other than the first chromaticity modification unit 181 and the second chromaticity modification unit 191 are the same as the configurations and functions of the components of the light-emitting device 8 that are assigned the same reference numerals, and therefore detailed descriptions thereof will be omitted here. Furthermore, the manufacturing method of the light-emitting device 8a is the same as the manufacturing method of the light-emitting device 8, and therefore detailed descriptions thereof will be omitted here.

[0113] The first chromaticity changer 181 differs from the chromaticity changer 18 in that a yellow phosphor is contained in a synthetic resin instead of a diffusing material, and the second chromaticity changer 191 differs from the chromaticity changer 18 in that a red phosphor is contained in a synthetic resin instead of a diffusing material. The yellow phosphor contained in the first chromaticity changer 181 is a phosphor such as YAG that emits yellow light having a dominant wavelength in the range between 570 nm and 590 nm, for example, 580 nm, in response to incident blue light. The red phosphor contained in the second chromaticity changer 191 is CaAlSiN that emits red light having a dominant wavelength in the range between 600 nm and 680 nm, for example, 660 nm, in response to incident blue light. ３ :Eu ２＋ and other phosphors.

[0114] The first chromaticity changers 181 and the second chromaticity changers 191 are arranged on a single diagonal line 16a of the phosphor sheet 16. Each of the first chromaticity changers 181 is arranged between the center of the phosphor sheet 16 and a corner at one end of the diagonal line 16a, and each of the second chromaticity changers 191 is arranged between the center of the phosphor sheet 16 and a corner at the other end of the diagonal line 16a.

[0115] The first chromaticity changer 181a is disposed between the center of the phosphor sheet 16 and one corner of the diagonal line 16a, and the second chromaticity changer 191a is disposed between the center of the phosphor sheet 16 and the other corner of the diagonal line 16a. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 181a is equal to the distance between the center of the phosphor sheet 16 and the second chromaticity changer 191a.

[0116] The first chromaticity changer 181b is disposed between the center of the phosphor sheet 16 and one corner of the diagonal line 16a, and the second chromaticity changer 191b is disposed between the center of the phosphor sheet 16 and the other corner of the diagonal line 16a. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 181b is shorter than the distance between the center of the phosphor sheet 16 and the second chromaticity changer 191b.

[0117] The first chromaticity changer 181c is disposed so as to cover the corner of the light emitting element 12c on one end side of the diagonal line 16a, and the second chromaticity changer 191b is disposed between the center of the phosphor sheet 16 and the corner on the other end side of the diagonal line 16a. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 181c is longer than the distance between the center of the phosphor sheet 16 and the second chromaticity changer 191c.

[0118] The first chromaticity changer 181d is disposed so as to cover one corner of the phosphor sheet 16, and the second chromaticity changer 191a is disposed so as to cover the other corner of the phosphor sheet 16. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 181d is equal to the distance between the center of the phosphor sheet 16 and the second chromaticity changer 191d.

[0119] Note that the phosphors contained in the first chromaticity change units 181a to 181d and the second chromaticity change units 191a to 191d and the arrangement of the first chromaticity change units 181a to 181d and the second chromaticity change units 191a to 191d described with reference to Figure 24 are merely examples and are not limited to these.

[0120] (Action and effect of the light-emitting device according to the first variant of the eighth embodiment) The light-emitting device 8a has a first chromaticity change unit 181 and a second chromaticity change unit 191 instead of the chromaticity change unit 18, making it possible to adjust the chromaticity over an even wider range than the light-emitting device 8.

[0121] FIG. 25(a) is a diagram (part 1) showing a comparison between the chromaticity adjustment range of the light-emitting device 8a and the chromaticity adjustment range of the light-emitting device 8, and FIG. 25(b) is a diagram (part 2) showing a comparison between the chromaticity adjustment range of the light-emitting device 8a and the chromaticity adjustment range of the light-emitting device 8. FIG. 25(a) shows a case where the color temperature is 2700K and the general color rendering index (Ra) is 90, and FIG. 25(b) shows a case where the color temperature is 6500K and the general color rendering index (Ra) is 90. In FIGS. 25(a) and 25(b), the horizontal axis represents the chromaticity difference Δx between the chromaticity coordinate x on the CIE chromaticity diagram when the chromaticity modification unit 18 is not provided. In FIGS. 25(a) and 25(b), the vertical axis represents the chromaticity difference Δy between the chromaticity coordinate y on the CIE chromaticity diagram when the chromaticity modification unit 18 is not provided. 25(a), W301 indicates the chromaticity difference of light-emitting device 8, W302 indicates the transition of the chromaticity difference when first chromaticity changer 181 of light-emitting device 8a is placed alone on phosphor sheet 16, and W303 indicates the transition of the chromaticity difference when second chromaticity changer 191 of light-emitting device 8a is placed alone on phosphor sheet 16. In FIG. 25(b), W401 indicates the transition of the chromaticity difference when light-emitting device 8 is placed alone on phosphor sheet 16, W402 indicates the chromaticity difference when first chromaticity changer 181 of light-emitting device 8a is placed alone on phosphor sheet 16, and W403 indicates the transition of the chromaticity difference when second chromaticity changer 191 of light-emitting device 8a is placed alone on phosphor sheet 16. In FIGS. 25(a) and 25(b), C1 indicates a 2-step MacAdam ellipse, and C2 indicates a 5-step MacAdam ellipse.

[0122] In the light-emitting device 8, the chromaticity difference can be changed one-dimensionally by changing the position of the chromaticity modification unit 18. On the other hand, in the light-emitting device 8a, the chromaticity difference can be changed two-dimensionally by changing the positions of the first chromaticity modification unit 181 and the second chromaticity modification unit 191, as shown by the dashed lines in Figures 25(a) and 25(b).

[0123] (Configuration and Function of Light Emitting Device According to Second Modification of Eighth Embodiment) FIG. 26 is a plan view of the upper surface of the reflector of a light emitting device according to a second modification of the eighth embodiment.

[0124] A light emitting device 8b according to a second modification of the eighth embodiment differs from the light emitting device 8 in that it has first chromaticity modification units 182a to 182d, second chromaticity modification units 183a to 183d, third chromaticity modification units 192a to 192d, and fourth chromaticity modification units 193a to 193d instead of the chromaticity modification units 18a to 18d. The first chromaticity modification units 182a to 182d are collectively referred to as first chromaticity modification units 182, and the second chromaticity modification units 183a to 183d are collectively referred to as second chromaticity modification unit 183. The third chromaticity modification units 192a to 192d are collectively referred to as third chromaticity modification unit 192, and the fourth chromaticity modification units 193a to 193d are collectively referred to as fourth chromaticity modification unit 193. The configurations and functions of the components of light-emitting device 8b other than first chromaticity change unit 182, second chromaticity change unit 183, third chromaticity change unit 192, and fourth chromaticity change unit 193 are the same as the configurations and functions of the components of light-emitting device 8 that are assigned the same reference numerals, and therefore detailed descriptions thereof will be omitted here. Furthermore, the manufacturing method of light-emitting device 8b is the same as the manufacturing method of light-emitting device 8, and therefore detailed descriptions thereof will be omitted here.

[0125] The first chromaticity change unit 182 and the third chromaticity change unit 192 differ from the chromaticity change unit 18 in that a yellow phosphor is contained in a synthetic resin instead of a diffusing material. The second chromaticity change unit 183 and the fourth chromaticity change unit 193 differ from the chromaticity change unit 18 in that a red phosphor is contained in a synthetic resin instead of a diffusing material. The yellow phosphor contained in the first chromaticity change unit 182 and the third chromaticity change unit 192 is a phosphor such as YAG that emits yellow light with a dominant wavelength between 570 nm and 590 nm, for example, 580 nm, in response to incident blue light. The red phosphor contained in the second chromaticity change unit 183 and the fourth chromaticity change unit 193 is CaAlSiN that emits red light with a dominant wavelength between 600 nm and 680 nm, for example, 660 nm, in response to incident blue light. ３ :Eu ２＋ and other phosphors.

[0126] The first chromaticity change units 182 and the third chromaticity change units 192 are arranged on one diagonal line 16a of the phosphor sheet 16. Each of the first chromaticity change units 182 is arranged between the center of the phosphor sheet 16 and a corner at one end of the diagonal line 16a, and each of the third chromaticity change units 192 is arranged between the center of the phosphor sheet 16 and a corner at the other end of the diagonal line 16a.

[0127] The second chromaticity change units 183 and the fourth chromaticity change units 193 are arranged on the other diagonal line 16b of the phosphor sheet 16. Each of the second chromaticity change units 183 is arranged between the center of the phosphor sheet 16 and a corner at one end of the diagonal line 16b, and each of the fourth chromaticity change units 193 is arranged between the center of the phosphor sheet 16 and a corner at the other end of the diagonal line 16b.

[0128] The first chromaticity changer 182a is disposed between the center of the phosphor sheet 16 and one corner of the diagonal line 16a, and the third chromaticity changer 192a is disposed between the center of the phosphor sheet 16 and the other corner of the diagonal line 16a. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 182a is equal to the distance between the center of the phosphor sheet 16 and the third chromaticity changer 192a. The second chromaticity changer 183a is disposed between the center of the phosphor sheet 16 and one corner of the diagonal line 16b, and the fourth chromaticity changer 193a is disposed between the center of the phosphor sheet 16 and the other corner of the diagonal line 16b. The distance between the center of the phosphor sheet 16 and the second chromaticity changer 183a is longer than the distance between the center of the phosphor sheet 16 and the fourth chromaticity changer 193a.

[0129] The first chromaticity changer 182b is disposed so as to cover one corner of the diagonal line 16a of the phosphor sheet 16, and the third chromaticity changer 192b is disposed so as to cover the other corner of the diagonal line 16a of the phosphor sheet 16. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 182b is equal to the distance between the center of the phosphor sheet 16 and the third chromaticity changer 192b. The second chromaticity changer 183b is disposed between the center of the phosphor sheet 16 and one corner of the diagonal line 16b, and the fourth chromaticity changer 193b is disposed between the center of the phosphor sheet 16 and the other corner of the diagonal line 16b. The distance between the center of the phosphor sheet 16 and the second chromaticity changer 183b is equal to the distance between the center of the phosphor sheet 16 and the fourth chromaticity changer 193b.

[0130] The first chromaticity changer 182c is disposed so as to cover the corner of the light-emitting element 12c on one end side of the diagonal line 16a of the phosphor sheet 16, and the third chromaticity changer 192c is disposed between the center of the phosphor sheet 16 and the corner at the other end of the diagonal line 16a. The distance between the center of the phosphor sheet 16 and the first chromaticity changer 182c is longer than the distance between the center of the phosphor sheet 16 and the third chromaticity changer 192c. The second chromaticity changer 183c is disposed between the center of the phosphor sheet 16 and the corner at one end of the diagonal line 16b, and the fourth chromaticity changer 193c is disposed between the center of the phosphor sheet 16 and the corner at the other end of the diagonal line 16b. The distance between the center of the phosphor sheet 16 and the second chromaticity changer 183c is shorter than the distance between the center of the phosphor sheet 16 and the fourth chromaticity changer 193c.

[0131] The first chromaticity change unit 182d, the second chromaticity change unit 183d, the third chromaticity change unit 192d, and the fourth chromaticity change unit 193d are arranged near the center of the phosphor sheet 16. The distances between the first chromaticity change unit 182d, the second chromaticity change unit 183d, the third chromaticity change unit 192d, and the fourth chromaticity change unit 193d and the center of the phosphor sheet 16 are equal to each other.

[0132] It should be noted that the phosphors contained in the first chromaticity change units 182a to 182d, the second chromaticity change units 183a to 183d, the third chromaticity change units 192a to 192d, and the fourth chromaticity change units 193a to 193d described with reference to Figure 26, as well as the arrangement of the first chromaticity change units 182a to 182d, the second chromaticity change units 183a to 183d, the third chromaticity change units 192a to 192d, and the fourth chromaticity change units 193a to 193d, are merely examples and are not limited to these.

[0133] (Action and effect of the light-emitting device according to the second variant of the eighth embodiment) The light-emitting device 8b has a first chromaticity modification unit 182, a second chromaticity modification unit 183, a third chromaticity modification unit 192 and a fourth chromaticity modification unit 193 instead of the chromaticity modification unit 18, and therefore, like the light-emitting device 8a, it is possible to adjust the chromaticity over an even wider range than the light-emitting device 8.

[0134] (Configuration and Function of Light-Emitting Device According to Third Modification of Eighth Embodiment) FIG. 27 is a plan view of the upper surface of the reflector of a light-emitting device according to a third modification of the eighth embodiment.

[0135] Light-emitting device 8c according to a third modified example of the eighth embodiment differs from light-emitting device 8 in that it has transparent resins 20a to 20d instead of transparent resin 15. Transparent resins 20a to 20d are collectively referred to as transparent resin 20. The configurations and functions of the components of light-emitting device 8c other than transparent resin 20 are the same as the configurations and functions of the components of light-emitting device 8 that are assigned the same reference numerals, and therefore detailed description thereof will be omitted here.

[0136] Like transparent resin 15, transparent resin 20 is a solidified adhesive member made of a transparent material such as silicone resin, and functions as an adhesive member that bonds light-emitting element 12 and phosphor sheet 16. Transparent resin 20 also functions as an emission amount change portion that changes the emission amount of blue light emitted from light-emitting element 12.

[0137] Transparent resin 20a is arranged so that its outer edge is in contact with the outer edge of phosphor sheet 16. Transparent resin 20b and transparent resin 20d are arranged so that their outer edges are located outside the outer edge of light-emitting element 12 and inside the outer edge of phosphor sheet 16. Transparent resin 20c is arranged so that its outer edge is in contact with the outer edge of light-emitting element 12.

[0138] 27 is merely an example and is not limited to these arrangements and diameters. The diameter of transparent resin 20b is the same as the diameter of transparent resin 20d, but the diameter of transparent resin 20b may be different from the diameter of transparent resin 20d.

[0139] The transparent resin 20 is arranged so that its outer edge is located outside the outer edge of the light-emitting element 12 and inside the outer edge of the phosphor sheet 16. The transparent resin 20 may be arranged so that part of its outer edge is in contact with the outer edge of the light-emitting element 12, such as a corner, or so that part of its outer edge is in contact with the outer edge of the phosphor sheet 16.

[0140] 28 is a flowchart showing a method for manufacturing a light emitting device 8c according to a third modification of the eighth embodiment. The processes of S301 and S302 are the same as those of S201 and S202, and therefore detailed description thereof will be omitted here.

[0141] Following the light-emitting element mounting step shown in S302, in a blue light measurement step, a threshold voltage is applied between the first wiring layer 31 and the second wiring layer 32 via the anode electrode 21 and the cathode electrode 22, and the peak wavelengths of the blue light emitted from the four light-emitting elements 12a to 12d are measured (S303). The peak wavelengths of the blue light emitted from the four light-emitting elements 12a to 12d are measured by a spectroscope.

[0142] Next, in a transparent resin amount determination step, the amount of raw material for transparent resin 20 to be disposed around light emitting elements 12a-12d and phosphor sheet 16 is determined based on the wavelength difference between the peak wavelength of blue light measured in the process of S303 and the target wavelength of blue light (S304). The amount of raw material for transparent resin 20 is determined, for example, by referring to a raw material amount table that shows the correspondence between the wavelength difference between the measured peak wavelength of blue light and the target wavelength of blue light and the amount of raw material for transparent resin 20. The raw material amount table describes the correspondence between the chromaticity difference between the measured peak wavelength of blue light and the target wavelength of blue light and the amount of raw material for transparent resin 20.

[0143] Next, in the phosphor sheet mounting process, the phosphor sheet 16 is fixed to the light emitting elements 12a-12d by the transparent resin 20 (S305). First, the raw material of the transparent resin 20 before solidification, in an amount determined in the process of S304, is placed around each of the light emitting elements 12a-12d. Next, the phosphor sheet 16 is placed above each of the light emitting elements 12a-12d. Then, as the mounting substrate 10 is heated, the raw material of the transparent resin 20 solidifies, and the phosphor sheet 16 is placed on the surface of each of the light emitting elements 12a-12d via the transparent resin 20. The processes of S306-S310 are similar to the processes of S204-S208, and therefore will not be described in detail here.

[0144] Furthermore, while the light emitting devices 8, 8a, 8b, and 8c have the first protective layer 13 and the second protective layer 14, the light emitting devices according to the embodiments may have a phosphor sheet with a flat upper surface, and may not have the first protective layer 13 and the second protective layer 14. For example, the light emitting devices according to the embodiments may have protrusions arranged to surround the reflector instead of the first protective layer 13 and the second protective layer 14. Furthermore, in the light emitting devices according to the embodiments, it is preferable that the reflector form a substantially flat surface around the phosphor sheet.

[0145] Furthermore, in the light emitting devices 8, 8a, 8b and 8c, each of the light emitting elements 12a to 12d is an SMD type LED element, but in the light emitting device according to the embodiment, the light emitting element may be an LED package such as an LED die or a CSP type LED element in which an SMD type LED element and a phosphor sheet are packaged in separate processes.

[0146] FIG. 29 is a perspective view of a light emitting device according to a fourth modification of the eighth embodiment.

[0147] The light emitting device 8d includes a substrate 90, four LED light emitting elements 91a to 91d, a protective layer 92, and four chromaticity changers 93a to 93d. In the light emitting device 8d, the LED light emitting elements 91a and 91c emit cool light with a color temperature of 6500 K in response to a voltage being applied to a first anode electrode 90a and a first cathode electrode 90b formed on the substrate 90. The LED light emitting elements 91b and 91d emit warm light with a color temperature of 2700 K in response to a voltage being applied to a second anode electrode 90c and a second cathode electrode 90d formed on the substrate 90. The LED light emitting elements 91a to 91d are collectively referred to as LED light emitting element 91, and the chromaticity changers 93a to 93d are collectively referred to as chromaticity changer 93.

[0148] The substrate 90 is a substrate in which a mounting substrate and a circuit board are integrated. Four LED light-emitting elements 91a-91d are mounted on the surface, and a first anode electrode 90a through a second cathode electrode 90d are formed on the surface. Each of the four LED light-emitting elements 91a-91d is an SMD-type LED element having an LED element 94a-94d (also referred to as a light-emitting element) and a phosphor sheet 95a-95d having a rectangular planar shape and disposed on the surface of the LED element 94a-94d. The protective layer 92 is a resist disposed to cover the surface of the substrate 90 except for the areas where the four LED light-emitting elements 91a-91d are disposed and the areas where the first anode electrode 90a through the second cathode electrode 90d are formed on the surface. The LED elements 94a-94d are collectively referred to as LED elements 94, and the phosphor sheets 95a-95d are collectively referred to as phosphor sheet 95. Like the chromaticity changing sections 18a to 18d, the chromaticity changing sections 93a to 93d have a synthetic resin such as silicone resin and a diffusing material such as titanium oxide contained in the synthetic resin, and are arranged on the surfaces of the four phosphor sheets 95a to 95d, respectively.

[0149] Figure 30(a) shows a first example of the arrangement of the chromaticity modification unit 93, Figure 30(b) shows a second example of the arrangement of the chromaticity modification unit 93, Figure 30(c) shows a third example of the arrangement of the chromaticity modification unit 93, and Figure 30(d) shows a fourth example of the arrangement of the chromaticity modification unit 93.

[0150] The first, second and third arrangement examples of the chromaticity modification unit 93 are similar to the first, second and fifth arrangement examples of the chromaticity modification unit 18 described with reference to Figures 21(a), 21(b) and 21(e), and therefore detailed description thereof will be omitted here.

[0151] In a fourth arrangement example of the chromaticity changer 93, the chromaticity changer 93 is arranged so as to cover the corners of the LED elements 94 and the phosphor sheet 95. In the fourth arrangement example, the chromaticity changer 93 has a fan-shaped planar shape and is arranged along the outer edge of the LED light-emitting element 91. In the fourth arrangement example, the chromaticity changer 93 is arranged offset from directly above the LED light-emitting element 91, which has the highest luminous intensity of blue light, so that the amount of reduction in luminance of blue light is small, and is approximately zero. In the fourth arrangement example, the amount of reduction in luminance of blue light is approximately zero, so that the amount of shift in the chromaticity of white light emitted from the surface of the phosphor sheet 95 toward yellow is approximately zero.

[0152] Although the light emitting devices 8, 8a, 8b, 8c, and 8d each have four light emitting elements 12 or LED light emitting elements 91, the light emitting devices according to the embodiments may have at least one light emitting element. Furthermore, the light emitting element 12 has a blue LED, but in the light emitting devices according to the embodiments, the light emitting element may have an LED that outputs ultraviolet light, or may have an element other than an LED, such as a laser diode.

[0153] Furthermore, although the light-emitting devices 8, 8a, 8b, 8c and 8d have phosphor sheets 16 or 95, the phosphor layers of the light-emitting devices according to the embodiments are not limited to sheet materials and may be formed by solidifying synthetic resin containing phosphors.

[0154] In the light emitting devices 8, 8a, 8b, 8c, and 8d, the chromaticity changer includes a synthetic resin and a diffusing material or a phosphor contained in the synthetic resin, but in the light emitting devices according to the embodiments, the chromaticity changer may be formed by incorporating both a diffusing material and a phosphor into the synthetic resin. In the light emitting devices according to the embodiments, the chromaticity changer may be an irregularity formed on the surface of the phosphor sheet 16 or 95.

[0155] Furthermore, in the light emitting devices 8, 8a, 8b, 8c, and 8d, the chromaticity change units are arranged along the diagonals of the phosphor sheet 16 or 95, but in the light emitting devices according to the embodiments, the chromaticity change units may be arranged in portions other than the pair of diagonals of the phosphor sheet 16 or 95. For example, the chromaticity change units may be arranged so as to move along the extension direction of a pair of opposing sides of the phosphor sheet 16 or 95.

[0156] Figure 31(a) shows a first modified example of the arrangement of the chromaticity change unit 18 in the light-emitting device 8, Figure 31(b) shows a second modified example of the arrangement of the chromaticity change unit 18 in the light-emitting device 8, and Figure 31(c) shows a third modified example of the arrangement of the chromaticity change unit 18 in the light-emitting device 8. Figure 31(d) shows a first modified example of the arrangement of the chromaticity change unit 93 in the light-emitting device 8d, Figure 31(e) shows a second modified example of the arrangement of the chromaticity change unit 93 in the light-emitting device 8d, and Figure 31(f) shows a third modified example of the arrangement of the chromaticity change unit 93 in the light-emitting device 8d.

[0157] In a first modified example of the arrangement of the chromaticity changer 18 in the light-emitting device 8 and the chromaticity changer 93 in the light-emitting device 8d, the chromaticity changer 18 and 93 are arranged at the center of the phosphor sheets 16 and 95. In a second modified example of the arrangement of the chromaticity changer 18 in the light-emitting device 8 and the chromaticity changer 93 in the light-emitting device 8d, the chromaticity changer 18 and 93 are arranged between the center and the end of the phosphor sheets 16 and 95.

[0158] In a third modified arrangement example of the chromaticity changer 18 in light-emitting device 8 and the chromaticity changer 93 in light-emitting device 8d, the chromaticity changers 18 and 93 are arranged at the ends of the phosphor sheets 16 and 95. The chromaticity changer 18 in light-emitting device 8 has a circular planar shape, and the chromaticity changer 93 in light-emitting device 8d has a semicircular planar shape.

[0159] Furthermore, in the light emitting devices 8a and 8b, the first chromaticity changers 181 and 182 and the third chromaticity changer 192 contain a yellow phosphor, but in the light emitting devices according to the embodiments, the first chromaticity changer and the third chromaticity changer may contain a green phosphor instead of the yellow phosphor. In the light emitting devices according to the embodiments, the first chromaticity changer and the third chromaticity changer contain a green phosphor instead of the yellow phosphor, thereby further widening the changeable chromaticity range.

[0160] The light emitting device according to the present disclosure may be of the following aspects: [Aspect 1] A light emitting device comprising: a substrate; at least one light emitting element mounted on the substrate and emitting first light having a first wavelength; at least one phosphor layer having a rectangular planar shape, containing a phosphor that absorbs the first light and emits second light having a second wavelength different from the first wavelength, and arranged to cover each of the at least one light emitting element; a reflective material arranged to surround the at least one light emitting element and the at least one phosphor layer and reflecting the first light; and a chromaticity changer arranged along each diagonal of the at least one phosphor layer and changing the chromaticity of mixed light of the first light and the second light. [Aspect 2] The light emitting device according to Aspect 1, wherein the chromaticity changer includes a synthetic resin and a diffusing material contained in the synthetic resin. [Aspect 3] The light emitting device according to Aspect 1, wherein the chromaticity changer includes a synthetic resin and a phosphor contained in the synthetic resin. [Aspect 4] The light emitting device according to Aspect 3, wherein the chromaticity changer includes: a first chromaticity changer containing a first phosphor that emits first converted light having a first converted wavelength; and a second chromaticity changer containing a second phosphor that emits second converted light having a second converted wavelength different from the first converted wavelength, and the first chromaticity changer and the second chromaticity changer are arranged along a single diagonal line. [Aspect 5] The light emitting device according to Aspect 3, wherein the chromaticity change unit includes: a first chromaticity change unit containing a first phosphor that emits first converted light having a first conversion wavelength; a second chromaticity change unit containing a second phosphor that emits second converted light having a second conversion wavelength different from the first conversion wavelength; a third chromaticity change unit containing the first phosphor; and a fourth chromaticity change unit containing the second phosphor, wherein the first chromaticity change unit and the third chromaticity change unit are arranged along one diagonal line, and the second chromaticity change unit and the fourth chromaticity change unit are arranged along the other diagonal line.[Aspect 6] The light emitting device according to any one of Aspects 1 to 5, wherein each of the at least one light emitting elements has a surface area smaller than that of the at least one phosphor layer and has a rectangular planar shape, the at least one light emitting element and the at least one phosphor layer are arranged so that their diagonals coincide, and the chromaticity changer is arranged so that at least a portion of the chromaticity changer does not overlap the at least one light emitting element in a planar view. [Aspect 7] The light emitting device according to Aspect 6, wherein the chromaticity changer is arranged so that at least a portion of the chromaticity changer does not overlap the at least one phosphor layer in a planar view. [Aspect 8] The light emitting device according to Aspect 7, wherein the chromaticity changer is arranged along an outer edge. [Aspect 9] The light emitting device according to Aspect 7, further comprising a transparent resin arranged between the at least one light emitting element and the reflective material, wherein the transparent resin is arranged so that an outer edge of the transparent resin is located outside an outer edge of the at least one light emitting element and inside an outer edge of the at least one phosphor layer. [Aspect 10] A method for manufacturing a light emitting device, comprising the steps of: mounting at least one light emitting element that emits first light having a first wavelength on a substrate; arranging at least one phosphor layer having a rectangular planar shape and containing a phosphor that absorbs the first light and emits second light having a second wavelength different from the first wavelength so as to cover each of the at least one light emitting element; arranging a reflective material that reflects the first light so as to surround the at least one light emitting element and the at least one phosphor layer; measuring the chromaticity of mixed light of the first light and the second light emitted from a surface of the at least one phosphor layer; determining positions on the surface of each of the at least one phosphor layer to place chromaticity modification units that modify the chromaticity of the mixed light based on a chromaticity difference between the measured chromaticity of the mixed light and a target chromaticity of the mixed light; and arranging the chromaticity modification units at the determined positions.[Aspect 11] A light emitting device comprising: a substrate; at least one light emitting element mounted on the substrate and emitting a first light having a first wavelength; at least one phosphor layer having a rectangular planar shape, containing a phosphor that absorbs the first light and emits a second light having a second wavelength different from the first wavelength, and arranged to cover each of the at least one light emitting element; a reflective material arranged to surround the at least one light emitting element and the at least one phosphor layer, and reflecting the first light; and a chromaticity changer arranged on a surface of the at least one phosphor layer, and changing the chromaticity of mixed light of the first light and the second light, wherein the chromaticity changer is arranged so that at least a portion of the chromaticity changer does not overlap the at least one phosphor layer when viewed in a plane. [Aspect 12] A light emitting device comprising: a substrate; at least one light emitting element mounted on the substrate and emitting a first light having a first wavelength; at least one phosphor layer having a rectangular planar shape, containing a phosphor that absorbs the first light and emits a second light having a second wavelength different from the first wavelength, and arranged to cover each of the at least one light emitting element; a reflective material arranged to surround the at least one light emitting element and the at least one phosphor layer, and reflecting the first light; and a chromaticity changer arranged on a surface of the at least one phosphor layer, and changing the chromaticity of mixed light of the first light and the second light, wherein the chromaticity changer is arranged along an outer edge.

Claims

1. a substrate having a first wiring layer and a second wiring layer insulated from the first wiring layer disposed on a surface thereof; at least one light emitting element having a first terminal electrically connected to the first wiring layer, a second terminal electrically connected to the second wiring layer, and a light emitting portion that emits light when a predetermined threshold voltage is applied between the first terminal and the second terminal; a first protective layer covering the first wiring layer and the second wiring layer so as to surround the at least one light emitting element; a second protective layer that is spaced apart from the first protective layer and covers at least one of the first wiring layer and the second wiring layer; a reflector that is arranged to surround the at least one light-emitting element and cover the first protective layer, and that reflects light emitted from the light-emitting portion; a light emitting device, wherein an outer edge of the end of the reflector facing the second protective layer coincides with an outer edge of the end of the first protective layer facing the second protective layer;

2. a phosphor sheet that contains a phosphor that absorbs light emitted from the light-emitting unit and converts the wavelength of the light into light having a wavelength different from the wavelength of the light emitted from the light-emitting unit, and is arranged to cover the light-emitting unit; a transparent resin having a fillet shape that is arranged along a side surface of the light-emitting portion and that increases in thickness as it approaches the phosphor sheet; The light emitting device according to claim 1 , wherein the reflector is disposed so as to contact an outer edge of the upper surface of the phosphor sheet.

3. The light emitting device according to claim 1 , wherein the first protective layer has a protrusion that protrudes toward a space formed between the first terminal and the second terminal.

4. the at least one light-emitting element is a plurality of the light-emitting elements, The light emitting device according to claim 3 , wherein the protrusion protrudes from between adjacently arranged light emitting elements toward a space formed between the first terminal and the second terminal of each of the light emitting elements.

5. 5. The light emitting device according to claim 1, wherein the second protective layer is disposed so as to surround the first protective layer.

6. a third protective layer disposed apart from the first protective layer; the substrate has a rectangular planar shape having a pair of short sides and a pair of long sides, the second protective layer is disposed so as to be in contact with one of the pair of short sides and cover the first wiring layer, and the third protective layer is disposed so as to be in contact with the other of the pair of short sides and cover the second wiring layer, The light-emitting device according to any one of claims 1 to 4, wherein the outer edge of the reflective material coincides with the outer edge of the end of the first protective layer facing the second protective layer and the third protective layer, and also coincides with the pair of long sides.

7. a third protective layer, a fourth protective layer, and a fifth protective layer spaced apart from the first protective layer; the substrate has a rectangular planar shape with four sides, the second protective layer, the third protective layer, the fourth protective layer, and the fifth protective layer are disposed at four corners of the substrate, 5. The light-emitting device according to claim 1, wherein the outer edge of the reflective material coincides with the outer edge of the end of the first protective layer facing the second protective layer, the third protective layer, the fourth protective layer, and the fifth protective layer, and coincides with the four sides.

8. a third protective layer disposed apart from the first protective layer; the at least one light emitting element is arranged in a ring shape; the first protective layer and the reflector have a ring-like planar shape and are arranged to surround the at least one light-emitting element, the second protective layer has a circular planar shape and is disposed inside the first protective layer, the third protective layer is disposed on the outside of the first protective layer, an inner edge of the reflector coincides with an inner edge of the first protective layer; 5. The light emitting device according to claim 1, wherein an outer edge of the reflector coincides with an outer edge of the first protective layer.

9. at least one phosphor layer having a rectangular planar shape, containing a phosphor that absorbs first light that is emitted from the at least one light-emitting element and has a first wavelength, and emits second light that has a second wavelength different from the first wavelength, and is arranged to cover each of the at least one light-emitting elements; a reflector that is arranged to surround the at least one light-emitting element and the at least one phosphor layer and that reflects the first light; a chromaticity changer disposed along each diagonal line of the at least one phosphor layer and changing the chromaticity of the mixed light of the first light and the second light; 10. The light emitting device of claim 1, wherein:

10. The light emitting device according to claim 9 , wherein the chromaticity changing portion has a synthetic resin and a diffusing material contained in the synthetic resin.

11. The light emitting device according to claim 9 , wherein the chromaticity changing portion has a synthetic resin and a phosphor contained in the synthetic resin.

12. The chromaticity change unit a first chromaticity changer including a first phosphor that emits first converted light having a first converted wavelength; a second chromaticity changer including a second phosphor that emits second converted light having a second converted wavelength different from the first converted wavelength, The light emitting device according to claim 11 , wherein the first chromaticity modifier and the second chromaticity modifier are arranged along a single diagonal line.

13. The chromaticity change unit a first chromaticity changer including a first phosphor that emits first converted light having a first converted wavelength; a second chromaticity changer including a second phosphor that emits second converted light having a second converted wavelength different from the first converted wavelength; a third chromaticity changer containing the first phosphor; a fourth chromaticity changer containing the second phosphor, the first chromaticity changer and the third chromaticity changer are arranged along one diagonal line, The light emitting device according to claim 11 , wherein the second chromaticity modifier and the fourth chromaticity modifier are arranged along the other diagonal line.

14. each of the at least one light-emitting element has a surface area smaller than a surface area of the at least one phosphor layer and has a rectangular planar shape; the at least one light-emitting element and the at least one phosphor layer are arranged so that their diagonals coincide with each other; 14. The light emitting device according to claim 9, wherein the chromaticity changer is disposed so that at least a portion of the chromaticity changer does not overlap the at least one light emitting element in a plan view.

15. The light emitting device according to claim 14 , wherein the chromaticity changing portion is disposed so that at least a portion of the chromaticity changing portion does not overlap the at least one phosphor layer in a plan view.

16. The light emitting device according to claim 15 , wherein the color-modifying portion is disposed along an outer edge.

17. The light-emitting element further includes a transparent resin disposed between the at least one light-emitting element and the reflector, The light emitting device according to claim 15 , wherein the transparent resin is arranged such that an outer edge thereof is located outside an outer edge of the at least one light emitting element and inside an outer edge of the at least one phosphor layer.

18. at least one phosphor layer having a rectangular planar shape, containing a phosphor that absorbs first light that is emitted from the at least one light-emitting element and has a first wavelength, and emits second light that has a second wavelength different from the first wavelength, and is arranged to cover each of the at least one light-emitting elements; a reflector that is arranged to surround the at least one light-emitting element and the at least one phosphor layer and that reflects the first light; a chromaticity changer disposed on a surface of the at least one phosphor layer and changing the chromaticity of the mixed light of the first light and the second light, The light emitting device according to claim 1 , wherein the chromaticity changing portion is disposed so that at least a portion of the chromaticity changing portion does not overlap the at least one phosphor layer in a plan view.

19. at least one phosphor layer having a rectangular planar shape, containing a phosphor that absorbs first light that is emitted from the at least one light-emitting element and has a first wavelength, and emits second light that has a second wavelength different from the first wavelength, and is arranged to cover each of the at least one light-emitting elements; a reflector that is arranged to surround the at least one light-emitting element and the at least one phosphor layer and that reflects the first light; a chromaticity changer disposed on a surface of the at least one phosphor layer and changing the chromaticity of the mixed light of the first light and the second light, The light emitting device according to claim 1 , wherein the chromaticity-modifying portion is disposed along an outer edge.