Light-emitting device

Abstract

Provided is a light-emitting device which has a plurality of light-emitting elements and for which heat dissipation properties have been taken into consideration. The light-emitting device comprises: a first member which includes a mounting surface and in which the width of the mounting surface in a first direction is larger than the width of the mounting surface in a second direction orthogonal to the first direction; a plurality of second members which are arranged on the mounting surface so as to sit side-by-side in the first direction; and a plurality of light-emitting elements which are respectively arranged on the plurality of second members so as to side side-by-side in the second direction. Each among the plurality of second members is configured such that the width in the first direction is smaller than the width in the second direction, and, in the smallest rectangle containing all of the plurality of second members in a top view, the width in the first direction is larger than the width in the second direction.

Description

Light-emitting device

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

[0002] For example, Patent Document 1 discloses a light emitting device having two sub-substrates on each of which two LEDs (Light Emitting Diodes) are mounted.

[0003] Japanese Patent Application Laid-Open No. 2015-133455

[0004] An object of an embodiment of the present disclosure is to provide a light emitting device that has a plurality of light emitting elements and is designed with heat dissipation in mind.

[0005] A light emitting device according to one embodiment of the present disclosure includes a first member including a mounting surface, the width of the mounting surface in a first direction being greater than the width of the mounting surface in a second direction perpendicular to the first direction; a plurality of second members arranged in a row in the first direction on the mounting surface; and a plurality of light emitting elements arranged in a row in the second direction on each of the plurality of second members, wherein each of the plurality of second members has a width in the first direction that is smaller than its width in the second direction, and in the smallest rectangle that encompasses all of the plurality of second members when viewed from above, the width in the first direction is greater than the width in the second direction.

[0006] A light emitting device according to one embodiment of the present disclosure includes a first member including a mounting surface, the width of the mounting surface in a first direction being greater than the width of the mounting surface in a second direction perpendicular to the first direction, a plurality of second members arranged side by side in the first direction on the mounting surface, and a plurality of light emitting elements arranged side by side in the second direction on each of the plurality of second members, wherein the number of the second members arranged in the first direction is greater than the number of the light emitting elements arranged in the second direction on the second members.

[0007] According to the embodiments of the present disclosure, it is possible to provide a light emitting device that has a plurality of light emitting elements and is designed with heat dissipation in mind.

[0008] Fig. 1 is a schematic top view showing the overall configuration of the light emitting device according to the first embodiment. Fig. 2 is a schematic cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a schematic perspective view showing a second member and a light emitting element provided in the light emitting device according to the first embodiment. Fig. 4 is a schematic perspective view showing a first example of a light emitting module according to a second embodiment. Fig. 5 is a schematic perspective view showing a second example of a light emitting module according to the second embodiment.

[0009] Light-emitting devices according to embodiments of the present disclosure will be described in detail with reference to the drawings. However, the embodiments shown below are merely illustrative of light-emitting devices that embody the technical concepts of the present embodiments and are not limited thereto. Furthermore, unless otherwise specified, the dimensions, materials, shapes, and relative arrangements of components described in the embodiments are not intended to limit the scope of the present disclosure to those specific embodiments, and are merely illustrative examples. The size, positional relationship, etc. of components shown in each drawing may be exaggerated for clarity. In the following description, identical names and symbols indicate identical or similar components, and detailed descriptions will be omitted as appropriate. An end view showing only the cut surface may be used as a cross-sectional view.

[0010] In the drawings shown below, directions may be indicated by the X-axis, Y-axis, and Z-axis. The X-axis, Y-axis, and Z-axis are mutually perpendicular directions. The X-direction along the X-axis and the Y-direction along the Y-axis indicate directions along the main light-emitting surface (hereinafter also referred to as the light-emitting surface) of the light-emitting element provided in the light-emitting device according to the embodiment. The Z-direction along the Z-axis indicates a direction perpendicular to the light-emitting surface. In other words, the light-emitting surface of the light-emitting element is parallel to the XY plane, and the Z-axis is perpendicular to the XY plane. The X-direction corresponds to the second direction. The Y-direction corresponds to the first direction. In this specification, the X-direction is referred to as the second direction X, and the Y-direction is referred to as the first direction Y.

[0011] The direction in which the arrow points in the X direction is denoted as the +X side, and the side opposite the +X side is denoted as the -X side. The direction in which the arrow points in the Y direction is denoted as the +Y side, and the side opposite the +Y side is denoted as the -Y side. The direction in which the arrow points in the Z direction is denoted as the +Z side, and the side opposite the +Z side is denoted as the -Z side. As an example, the light-emitting element provided in the light-emitting device according to the embodiment emits light mainly in the +Z side. Furthermore, the term "top view" in the embodiments refers to viewing an object from the light-emitting surface side of the light-emitting device according to the embodiment. Note that in this specification, in addition to portions that can be directly viewed from above, portions that cannot be directly viewed from above may also be described as being seen through the light. However, these do not limit the orientation of the light-emitting device according to the embodiment during use, and the orientation of the light-emitting device according to the embodiment is arbitrary.

[0012] In this specification, the surface of an object when viewed from the +Z side is referred to as the "top surface," and the surface of an object when viewed from the -Z side is referred to as the "bottom surface." Viewing an object from the +Z side is referred to as a top view. In the following embodiments, "along the X-axis, Y-axis, and Z-axis" includes the object having a tilt within a range of ±10 degrees relative to these axes. Furthermore, in this embodiment, "orthogonal" may include an error within ±10 degrees from 90 degrees. "Placing" is not limited to direct contact, but also includes indirect placement, for example via another member.

[0013] [First Embodiment] <Configuration of Light-Emitting Device According to First Embodiment> The configuration of the light-emitting device according to the first embodiment will be described with reference to Figures 1 to 3. Figure 1 is a schematic top view showing an example of the overall configuration of a light-emitting device 100 according to the first embodiment. Figure 2 is a schematic cross-sectional view taken along line II-II in Figure 1. Figure 3 is a schematic perspective view showing an example of a second member 2 and a light-emitting element 3 included in the light-emitting device 100 according to the first embodiment. Note that Figure 3 shows one second member 2 out of the multiple second members 2 included in the light-emitting device 100, and two light-emitting elements 3 disposed on the one second member 2.

[0014] 1 and 2 , the light emitting device 100 has a first member 1 that includes a mounting surface 11, and the width W1y of the mounting surface 11 in a first direction Y is greater than the width W1x of the mounting surface 11 in a second direction X that is perpendicular to the first direction Y. The light emitting device 100 also has a plurality of second members 2 that are arranged side by side in the first direction Y on the mounting surface 11, and a plurality of light emitting elements 3 that are arranged side by side in the second direction X on each of the plurality of second members 2.

[0015] In the example shown in Figures 1 and 2, the plurality of second members 2 include four second members 2. The plurality of light-emitting elements 3 include two light-emitting elements on each of the four second members 2. Therefore, the plurality of light-emitting elements 3 includes eight light-emitting elements 3. The light-emitting device 100 shown in Figures 1 and 2 includes a frame 4 that is joined to the first member 1 and surrounds the plurality of second members 2 in a top view, a light-transmitting member 5 that is placed on the plurality of light-emitting elements 3, and a joining member 6 that joins the first member 1 and the second member 2. The first member 1 and the frame 4 are arranged on the upper surface of a support substrate 7. The light-emitting device 100 uses the light-emitting surface 31 of each of the plurality of light-emitting elements 3 as a main light-emitting surface and emits light upward.

[0016] In this embodiment, the width W2y of each of the multiple second members 2 in the first direction Y is smaller than the width W2x in the second direction X. Furthermore, in the smallest rectangle 20 that encompasses all of the multiple second members 2 in a top view, the width W4y in the first direction Y is larger than the width W4x in the second direction X. In the example shown in FIG. 1 , the smallest rectangle 20 is represented by a dashed line. However, for ease of understanding, the dashed line is depicted slightly larger than the smallest rectangle 20. Furthermore, because the width W2x of the second member 2 and the width W4x of the smallest rectangle 20 in the second direction X are approximately equal, the widths W2x and W4x are both indicated by symbols.

[0017] In this embodiment, instead of placing one component having the size of the smallest rectangle 20 on the mounting surface 11, multiple second components 2 are placed within the area of ​​the smallest rectangle 20. This makes it possible to reduce the width of one component placed within the area of ​​the smallest rectangle 20. By placing multiple second components 2 on the mounting surface 11 so that the multiple second components 2 are aligned in the first direction Y, it is possible to reduce the width of each component in the first direction Y.

[0018] In this embodiment, the plurality of light-emitting elements 3 are arranged side by side in the second direction X on each of the plurality of second members 2. By arranging the plurality of second members 2, each having the plurality of light-emitting elements 3 arranged in the second direction X, side by side in the first direction Y, the plurality of light-emitting elements 3 can be arranged side by side on the mounting surface 11 in two axial directions, the first direction Y and the second direction X.

[0019] In the light-emitting device 100, the frame 4 is primarily made of a material different from the primary material of the first member 1. For example, the frame 4 may be primarily made of a ceramic material, and the first member 1 may be primarily made of a metal material such as copper. Because ceramic materials have a smaller linear expansion coefficient than metal materials, the difference in linear expansion coefficient between the frame 4 and the first member 1 is likely to cause warping in the first member 1. When mounting the second member 2 on the mounting surface 11 of the first member 1, the wider the second member 2, the greater the impact of warping of the first member 1 on mounting the second member 2 to the first member 1. For example, the difference in height caused by warping may cause differences in the thickness of the bonding member 6 between the first member 1 and the second member 2. Furthermore, for example, bonding to a warped second member 2 may also cause warping in the first member 1. By providing multiple second members 2 and reducing the width of each second member 2, it is possible to reduce the effect of warping of the first member 1 on the second member 2. For example, it is thought that the thicker the joining member 6, the lower the heat dissipation from the second member 2 to the first member 1, but this reduction in heat dissipation can be reduced. This allows for a light emitting device 100 that takes heat dissipation into consideration.

[0020] The main material of the frame body 4 is not limited to a ceramic material. Furthermore, the main material of the first member 1 is not limited to a metal material such as copper. The first member 1 has a higher thermal conductivity than the frame body 4. By using a material with excellent heat dissipation properties for the first member 1 having the mounting surface 11, heat generated from the light-emitting element 3 can be easily dissipated from the first member 1 to the outside of the light-emitting device 100. This allows the light-emitting device 100 to be designed with heat dissipation properties in mind.

[0021] The first member 1 has a higher thermal conductivity than the second member 2. For example, if the first member 1 is primarily made of a metal material such as copper and the second member 2 is primarily made of a ceramic material, the first member 1 will have a higher thermal conductivity than the second member 2. This makes it easier for heat generated by the light emission of the light-emitting element 3 disposed on the second member 2 to be discharged to the outside of the light-emitting device 100 through the first member 1, compared to when the thermal conductivity of the first member 1 is the same as or lower than that of the second member 2. This improves the heat dissipation properties of the light-emitting device 100, resulting in a light-emitting device 100 that takes heat dissipation properties into consideration.

[0022] The light-emitting element 3 is a light-emitting diode (LED). In the light-emitting device 100, when a plurality of light-emitting diodes are used as the plurality of light-emitting elements 3, heat dissipation can be improved, and the light-emitting device 100 can be designed with heat dissipation in mind.

[0023] The light-emitting diodes constituting the light-emitting elements 3 emit ultraviolet light. Light-emitting diodes that emit ultraviolet light are prone to temperature rise. In the light-emitting device 100, in a configuration in which a plurality of light-emitting diodes that each emit ultraviolet light are used as a plurality of light-emitting elements 3, heat dissipation can be improved, and the light-emitting device 100 can be designed with heat dissipation in mind.

[0024] In the light emitting device 100, the number of second members 2 arranged in the first direction Y is greater than the number of light emitting elements 3 arranged in the second direction X of the second members 2. Because the width W2y of the second member 2 in the first direction Y is smaller than the width W2x in the second direction X, it is possible to reduce the difference in thickness of the bonding member 6 between the first member 1 and the second member 2 caused by warping of the first member 1. This makes it possible to increase the number of light emitting elements 3 to be mounted while reducing the deterioration in heat dissipation performance caused by an increase in the thickness of the bonding member 6.

[0025] In the light-emitting device 100, the two light-emitting elements 3 are arranged in an arrangement region 24 located at the center of the second member 2 in the second direction X. This allows the light-emitting device 100 to secure ample space in both end regions 28 on the second member 2 in the second direction X. By securing ample space in the both end regions 28, the space can be used, for example, as an area for arranging wiring for supplying current to the light-emitting elements 3. If the warp of the first member 1 is convex, with the center being higher than the edges, arranging the light-emitting elements 3 in the center of the second member 2 may be more advantageous in terms of heat dissipation than arranging the light-emitting elements 3 at the edges of the second member 2. While securing space at both ends of the second member 2 in the first direction Y increases the spacing between the light-emitting elements 3 aligned in the first direction Y, securing space in the both end regions 28 in the second direction X reduces the spacing between the light-emitting elements 3 aligned in the first direction Y, allowing the multiple light-emitting elements 3 to be arranged closer together.

[0026] In the illustrated example of the light-emitting device 100, the number of second members 2 aligned in the first direction Y is four, and the number of light-emitting elements 3 aligned in the second direction X is two. Therefore, the number of second members 2 aligned in the first direction Y is two more than the number of light-emitting elements 3 aligned in the second direction X. In the light-emitting device 100, heat dissipation can be reduced and the multiple light-emitting elements 3 can be arranged closer to each other. Note that in the light-emitting device 100, the above-described effects can be obtained even when the number of second members 2 aligned in the first direction Y is one or more more than the number of light-emitting elements 3 aligned in the second direction X.

[0027] Each component of the light emitting device 100 will be described in detail below.

[0028] (First member 1) The first member 1 has a mounting surface 11, a bottom surface 12, and multiple side surfaces 13. As shown in FIGS. 1 and 2, the side surfaces 13 of the first member 1 are surrounded by the frame body 4, and the first member 1 is a member disposed below the frame body 4. The first member 1 is bonded to the frame body 4. In the example shown in FIG. 2, the mounting surface 11 of the first member 1 is bonded to the frame body 4. The mounting surface 11 is located below the top surface 41 of the frame body 4 and above the bottom surface 42 of the frame body 4. The mounting surface 11 is the top surface of the first member 1. In a top view, the mounting surface 11 has a rectangular shape having short sides and long sides. The short sides of the mounting surface 11 are sides of the mounting surface 11 extending in the first direction Y. The long sides of the mounting surface 11 are sides of the mounting surface 11 extending in the second direction X.

[0029] The first member 1 is formed using a metal or a composite containing a metal as the main material. The first member 1 shown in FIGS. 1 and 2 is formed using copper as the main material. Here, the main material refers to the material that accounts for the largest proportion by mass or volume of the target structure. Note that when the target structure is formed from a single material, that material is the main material. In other words, when a material is the main material, it is possible that the proportion of that material could be 100%.

[0030] (Second Member 2) As shown in FIG. 2 , the second member 2 is disposed on the mounting surface 11 of the first member 1. The light-emitting element 3 and the first member 1 are electrically insulated by the second member 2. In the light-emitting device 100, the bonding area between the lower surface 22 of the second member 2 and the mounting surface 11 of the first member 1 is 50% or more of the area of ​​the lower surface 22 of the second member 2. In the light-emitting device 100, the distance dy between adjacent second members 2 in the first direction Y in FIG. 1 is preferably 50 μm or more and 500 μm or less. In addition, the distance dy between adjacent second members 2 in the first direction Y is preferably 3.3% or more and 50% of the width W2y of the second member 2 in the first direction Y, which allows multiple light-emitting elements 3 to be mounted at high density in the first direction Y.

[0031] The second member 2 has an upper surface 21, a lower surface 22, and a plurality of side surfaces 23. As shown in FIG. 1 , the upper surface 21 has a rectangular shape when viewed from above. The upper surface 21 has short sides and long sides. The short sides of the upper surface 21 are sides of the upper surface 21 that extend in the first direction Y. The long sides of the upper surface 21 are sides of the upper surface 21 that extend in the second direction X.

[0032] The second member 2 is configured in the shape of a rectangular parallelepiped. The distance between the upper surface 21 and the lower surface 22 of the second member 2 is smaller than the distance between the other two opposing surfaces. This distance between the upper surface 21 and the lower surface 22 is called the thickness of the second member 2. However, the shape of the second member 2 is not limited to a rectangular parallelepiped.

[0033] An arrangement region 24 is provided on the upper surface 21. Other components are arranged in the arrangement region 24. The arrangement region 24 ensures space for arranging the other components. The shape of the arrangement region 24 corresponds to the shape of the component to be arranged therein. In the example shown in FIG. 1 , the arrangement region 24 corresponds to the shape of the light-emitting element 3.

[0034] It is preferable that the angle formed between the long sides of the upper surfaces 21 of the plurality of second members 2 arranged side by side in the first direction Y is 0 degrees, i.e., the long sides of the upper surfaces 21 are parallel to each other. Here, the "parallel" allows a difference of ±3 degrees. By arranging the plurality of second members 2 so that the long sides of the upper surfaces 21 are parallel to each other, it is possible to arrange the plurality of second members 2 at high density. This makes it possible to reduce the distance between the light-emitting elements 3 arranged side by side in the first direction Y, and to arrange the plurality of light-emitting elements 3 closer to each other.

[0035] The width W2y of the second member 2 in the first direction Y is preferably 500 μm or more and 1500 μm or less. The width W2x of the second member 2 in the second direction X is preferably 1000 μm or more and 3000 μm or less. The width W2x is preferably 150% or more and 300% or less of the width W2y. The thickness of the second member 2 is preferably 150 μm or more and 1000 μm or less.

[0036] As shown in FIGS. 1 and 3 , wiring layers 27 are disposed in both end regions 28 of the second member 2 in the second direction X. The wiring layers 27 of multiple second members 2 arranged in the first direction Y are connected in series using wiring 25, thereby connecting multiple light-emitting elements 3 disposed on each of the multiple second members 2 in series. In the light-emitting device 100, connecting the second members 2 with wiring 25 can ensure a large bonding area between the second member 2 and the first member 1. The wiring 25 is, for example, a wire. However, the wiring 25 may be a material other than a wire, such as a ribbon. Note that marks 26 provided on the wiring layer 27 in the both end regions 28 are alignment marks used when positioning the second member 2 and the light-emitting element 3 relative to the first member 1.

[0037] The second member 2 can be formed using, for example, silicon nitride, aluminum nitride, or silicon carbide. The placement region 24 is also provided with a joining member 6 for joining to other components.

[0038] (Light-emitting element 3) The light-emitting element 3 is disposed on the upper surface 21 of the second member 2. The light-emitting element 3 has each of its upper surfaces as a main light-emitting surface 31, and emits light upward. The light-emitting element 3 may be, for example, a light-emitting diode. The light-emitting element 3 may also be, for example, a vertical-cavity surface-emitting laser (VCSEL). The light-emitting element 3 may also emit ultraviolet light. The peak wavelength of the ultraviolet light emitted by the light-emitting element 3 is, for example, not less than 200 nm and not more than 410 nm.

[0039] The number of light-emitting elements 3 included in the light-emitting device 100 is not limited to eight, and can be changed as appropriate depending on the intended use of the light-emitting device 100, etc. The number of light-emitting elements 3 arranged on one second member 2 can also be changed as appropriate. However, in the light-emitting device 100, only one light-emitting element 3 is arranged on one second member 2 in the first direction Y. Furthermore, if too many light-emitting elements 3 are arranged on one second member 2, warping of the second member 2 may occur. Therefore, it is preferable that the number of light-emitting elements 3 arranged on one second member 2 be four or less.

[0040] 1 and 3, width W3y is the width of the light-emitting element 3 in the first direction Y. Width W3x is the width of the light-emitting element 3 in the second direction x. In a light-emitting device 100 in which n light-emitting elements 3 are arranged on one second member 2, width W2x of the second member 2 is preferably equal to or less than a value obtained by multiplying width W3x of the light-emitting element 3 by n and adding 1.0 mm to the value.

[0041] In the example shown in FIG. 3 , the multiple light-emitting elements 3 arranged on the second member 2 include a first light-emitting element 3-1 and a second light-emitting element 3-2. The first light-emitting element 3-1 includes a first light-emitting surface 31-1 and a first electrode 321-1 and a second electrode 322-1 located on the side of the first light-emitting element 3-1 facing the second member 2. The first electrode 321-1 is electrically connected to a first wiring layer 27-1 arranged in one of the end regions 28 of the second member 2. The second electrode 322-1 is electrically connected to a third wiring layer 27-3 arranged in the arrangement region 24 of the second member 2. The second light-emitting element 3-2 includes a second light-emitting surface 31-2 and a first electrode 321-2 and a second electrode 322-2 located on the side of the second light-emitting element 3-2 facing the second member 2. The first electrode 321-2 is electrically connected to the third wiring layer 27-3 arranged in the placement region 24 of the second member 2. The second electrode 322-2 is electrically connected to the second wiring layer 27-2 arranged in the other of the end regions 28 of the second member 2.

[0042] (Frame 4) As shown in Fig. 1, the frame 4 is a frame member formed primarily of ceramics and having a wiring pattern 46. Examples of ceramics include aluminum nitride, silicon nitride, aluminum oxide, and silicon carbide. Examples of metals include copper, aluminum, and iron. Alternatively, composites containing metals such as copper molybdenum, copper-diamond composites, and copper tungsten can be used.

[0043] The frame 4 has an upper surface 41, a lower surface 42, and a plurality of outer surfaces 43. When viewed from above, the outer edge of the frame 4 is rectangular. This rectangle may have long and short sides. In the frame 4, the long side of the rectangle is oriented in the same direction as the first direction Y, and the short side is oriented in the same direction as the second direction X.

[0044] As shown in FIG. 2 , a through hole 40 is formed in the frame body 4. The through hole 40 is a hole that penetrates downward from an upper surface 41 to a lower surface 42. A recess is defined by the inner wall of the through hole 40 in the frame body 4 and the mounting surface 11 of the first member 1. This recess is surrounded by the upper surface 41 in a top view. The frame body 4 is not limited to having the through hole 40, and may have a recessed shape that is recessed from the upper surface 41 downward below the upper surface 41. In this case, the first member 1 is disposed on the bottom surface of the recessed shape.

[0045] The inner edge of the upper surface 41 defines the outer edge of the recess. When viewed from above, the outer edge of the recess has a rectangular shape. This rectangle can have long and short sides. In the frame 4, the long side of this rectangle is in the same direction as the first direction Y, and the short side is in the same direction as the second direction X. Note that the outer edge of this recess does not have to be rectangular.

[0046] The frame body 4 has at least one inner side surface 44. The at least one inner side surface 44 is located above the mounting surface 11. The at least one inner side surface 44 intersects with the upper surface 41. The at least one inner side surface 44 is included in the multiple surfaces that define the through hole 40 of the frame body 4. The at least one inner side surface 44 is arranged perpendicular to the mounting surface 11. Here, the perpendicularity allows for a difference of ±3 degrees. Note that the inner side surface 44 does not have to be perpendicular to the mounting surface 11.

[0047] The frame 4 has at least one step portion 45. The step portion 45 has an upper surface 451 and an inner surface 454 that intersects with the upper surface 451 and extends downward from the upper surface 451. The upper surface 451 of the step portion 45 intersects with the inner surface 44. The step portion 45 is formed along part or all of the inner surface 44 in a top view. At least one step portion 45 is formed inside the upper surface 41 in a top view. At least one step portion 45 is formed inside at least one inner surface 44 in a top view.

[0048] The frame 4 may have a plurality of step portions 45. The plurality of step portions 45 includes a step portion 45 formed along the inner surface 44 in a top view. The plurality of step portions 45 includes a step portion 45 formed along the entire inner surface 44 in a top view.

[0049] 1 , at least one wiring pattern 46 is provided on the upper surface of the step portion 45. The wiring pattern 46 is electrically connected to other wiring patterns via wiring passing through the interior of at least one of the first member 1 and the frame body 4. The other wiring patterns are provided on the lower surface of at least one of the first member 1 and the frame body 4. The wiring pattern 46 may be electrically connected to wiring patterns provided on the upper surface 41 or the outer surface 43.

[0050] In the frame body 4, the location where the wiring pattern 46 is provided is not limited to the step portion 45. It can be said that the frame body 4 has a wiring layer provided for electrical connection, and in the frame body 4 shown in Figures 1 and 2, the step portion 45 is also a wiring layer.

[0051] (Light-transmitting member 5) The light-transmitting member 5 has a lower surface and an upper surface, and is configured in the shape of a rectangular parallelepiped flat plate. However, it does not have to be a rectangular parallelepiped. The light-transmitting member 5 has light-transmitting properties that allow light to pass through. Here, light-transmitting means that the transmittance for light is 80% or more. However, it is not necessary for the transmittance for light of all wavelengths to be 80% or more. Since the light-emitting device 100 emits ultraviolet light, the transmittance for at least ultraviolet light is 80% or more. The light-transmitting member 5 may have a non-light-transmitting region (a region that does not have light-transmitting properties) in part.

[0052] The light-transmitting member 5 is formed using glass as a main material. The main material forming the light-transmitting member 5 is a material having high light transmittance. The light-transmitting member 5 is not limited to glass, and may be formed using sapphire as a main material, for example.

[0053] The light-transmitting member 5 is disposed on the upper surface 41 of the frame body 4 and is joined to the frame body 4. In the light-emitting device 100, by joining the light-transmitting member 5 and the frame body 4, a closed space is formed that is defined by the light-transmitting member 5, the frame body 4, and the first member 1. This closed space can be a hermetically sealed space.

[0054] 2, the bonding member 6 is disposed between the second member 2 and the first member 1. The bonding member 6 is a member that bonds the second member 2 and the first member 1. The bonding member 6 can be made of Au paste or the like.

[0055] (Supporting Substrate 7) The supporting substrate 7 is a plate-shaped member that supports the light emitting device 100. The supporting substrate 7 may be configured as a single layer in the Z direction, or may be configured as multiple layers. The supporting substrate 7 is configured, for example, with copper as its main material.

[0056] [Second embodiment] A light-emitting module according to a second embodiment will be described with reference to Figures 4 and 5. Note that the same names and symbols as those in the embodiments of the present disclosure already described indicate the same or similar members or configurations, and detailed descriptions thereof will be omitted as appropriate.

[0057] Fig. 4 is a schematic perspective view showing a first example of a light emitting module 200 according to the second embodiment. Fig. 5 is a schematic perspective view showing a second example of a light emitting module 200 according to the second embodiment.

[0058] The light emitting module 200 includes a plurality of light emitting devices 100 and a support substrate 7 that supports each of the plurality of light emitting devices 100. The light emitting module 200 emits light emitted from each of the plurality of light emitting devices 100 upward.

[0059] In a first example shown in Fig. 4, the light-emitting module 200 has six light-emitting devices 100. The six light-emitting devices 100 are arranged in a matrix, with two light-emitting devices 100 aligned in the first direction Y and three light-emitting devices 100 aligned in the second direction X. In a second example shown in Fig. 5, the light-emitting module 200 has twelve light-emitting devices 100. The twelve light-emitting devices 100 are arranged in a matrix, with three light-emitting devices 100 aligned in the first direction Y and four light-emitting devices 100 aligned in the second direction X.

[0060] The light emitting module 200 can emit light from a plurality of light emitting devices 100 in combination. The number of light emitting devices 100 included in the light emitting module 200 is not limited to six or twelve, and can be changed as appropriate depending on the intended use of the light emitting module 200. In addition, the number of the plurality of light emitting devices 100 arranged in each of the first direction Y and the second direction X in the light emitting module 200 can also be changed as appropriate depending on the intended use of the light emitting module 200. Furthermore, the arrangement of the plurality of light emitting devices 100 is not limited to a matrix arrangement, and may be arranged in other patterns such as concentric circles, radially, or in a triangular lattice pattern.

[0061] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0062] All ordinal numbers, quantitative numbers, and other figures used in the description of the embodiments are provided as examples to specifically explain the technology of the present disclosure, and the present disclosure is not limited to the illustrated figures. Furthermore, the connection relationships between components are provided as examples to specifically explain the technology of the present disclosure, and do not limit the connection relationships that realize the functions of the present disclosure.

[0063] The light-emitting device of the present disclosure has a plurality of light-emitting elements and can be a light-emitting device with consideration given to heat dissipation, and therefore can be suitably used in applications such as printing and exposure in which ultraviolet light is irradiated onto an object to harden the object, although the light-emitting device of the present disclosure is not limited to these applications.

[0064] For example, aspects of the present disclosure are as follows: <Item 1> A light emitting device including a first member that includes a mounting surface, the width of the mounting surface in a first direction being larger than the width of the mounting surface in a second direction orthogonal to the first direction, a plurality of second members that are arranged side by side in the first direction on the mounting surface, and a plurality of light emitting elements that are arranged side by side in the second direction on each of the plurality of second members, wherein each of the plurality of second members has a width in the first direction that is smaller than its width in the second direction, and the width in the first direction is larger than the width in the second direction of the smallest rectangle that encompasses all of the plurality of second members in a top view. <Item 2> A light emitting device including a first member including a mounting surface, the width of the mounting surface in a first direction being greater than the width of the mounting surface in a second direction perpendicular to the first direction; a plurality of second members arranged side by side in the first direction on the mounting surface; and a plurality of light emitting elements arranged side by side in the second direction on each of the plurality of second members, wherein the number of the second members arranged in the first direction is greater than the number of light emitting elements arranged on the second member in the second direction. <Item 3> The light emitting device according to <Item 1> or <Item 2>, further including a frame body joined to the first member and surrounding the plurality of second members in a top view. <Item 4> The light emitting device according to <Item 3>, wherein the frame body is made primarily of a material different from the primary material of the first member. <Item 5> The light emitting device according to <Item 4>, wherein the frame body has a linear expansion coefficient smaller than that of the first member. <Item 6> The light emitting device according to any one of <Item 1> to <Item 5>, wherein the first member has a higher thermal conductivity than the second member. <Item 7> The light emitting device according to any one of <Item 1> to <Item 6>, wherein the light emitting element is a light emitting diode. <Item 8> The light emitting device according to <Item 7>, wherein the light emitting diode emits ultraviolet light. <Item 9> The light emitting device according to any one of <Item 1> to <Item 8>, wherein the number of the second members arranged in the first direction is one or more greater than the number of the light emitting elements arranged in the second direction.<Item 10> The light emitting device according to any one of <Item 1> to <Item 9>, wherein the number of the second members arranged in the first direction is two or more than the number of the light emitting elements arranged in the second direction.

[0065] This application claims priority based on Japanese Patent Application No. 2024-058045 filed with the Japan Patent Office on March 29, 2024, and includes the entire contents of this Japanese patent application.

[0066] 1 First member 11 Mounting surface 2 Second member 20 Minimum rectangle 21 Upper surface 22 Lower surface 23 Side surface 24 Placement area 25 Wiring 26 Mark 27 Wiring layer 27-1 First wiring layer 27-2 Second wiring layer 27-3 Third wiring layer 28 End areas 3 Light-emitting element 3-1 First light-emitting element 3-2 Second light-emitting element 31 Light-emitting surface 31-1 First light-emitting surface 31-2 Second light-emitting surface 321-1 First electrode 322-1 Second electrode 321-2 First electrode 322-2 Second electrode 4 Frame 41 Upper surface 42 Lower surface 43 Outer surface 44 Inner surface 45 Step portion 451 Upper surface 454 Inner surface 46 Wiring pattern 5 Light-transmitting member 6 Bonding member 7 Support substrate 100 Light emitting device 200 Light emitting module dy Distance between adjacent second members in the first direction X Second direction Y First direction W1x Width of mounting surface in the second direction W1y Width of mounting surface in the first direction W2x Width of second member in the second direction W2y Width of second member in the first direction W3x Width of light emitting element in the second direction W3y Width of light emitting element in the first direction W4y Width of smallest rectangle in the first direction W4x Width of smallest rectangle in the second direction

Claims

1. A light emitting device comprising: a first member including a mounting surface, the width of the mounting surface in a first direction being greater than the width of the mounting surface in a second direction perpendicular to the first direction; a plurality of second members arranged side by side in the first direction on the mounting surface; and a plurality of light emitting elements arranged side by side in the second direction on each of the plurality of second members, wherein each of the plurality of second members has a width in the first direction that is smaller than its width in the second direction, and the width in the first direction is greater than the width in the second direction of the smallest rectangle that encompasses all of the plurality of second members in a top view.

2. A light emitting device comprising: a first member including a mounting surface, the width of the mounting surface in a first direction being greater than the width of the mounting surface in a second direction perpendicular to the first direction; a plurality of second members arranged side by side in the first direction on the mounting surface; and a plurality of light emitting elements arranged side by side in the second direction on each of the plurality of second members, wherein the number of the second members arranged in the first direction is greater than the number of the light emitting elements arranged in the second direction on the second members.

3. The light emitting device according to claim 1 or 2, further comprising a frame body joined to the first member and surrounding the plurality of second members in a top view.

4. The light emitting device according to claim 3, wherein the frame body is made mainly of a material different from the main material of the first member.

5. The light emitting device according to claim 4, wherein the frame has a linear expansion coefficient smaller than that of the first member.

6. The light emitting device according to any one of claims 1 to 5, wherein the first member has a higher thermal conductivity than the second member.

7. The light emitting device according to any one of claims 1 to 6, wherein the light emitting element is a light emitting diode.

8. The light emitting device according to claim 7, wherein the light emitting diode emits ultraviolet light.

9. A light emitting device according to any one of claims 1 to 8, wherein the number of said second members arranged in said first direction is one or more greater than the number of said light emitting elements arranged in said second direction.

10. A light-emitting device according to any one of claims 1 to 9, wherein the number of second members arranged in the first direction is two or more than the number of light-emitting elements arranged in the second direction.

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