Light-emitting device

Abstract

Provided is a light-emitting device in which a plurality of light-emitting elements arranged in a row are divided into two or more groups that can be driven independently and are electrically connected. The device comprises: a substrate having a mounting surface including a configuration area, a plurality of first wirings and a second wiring; a plurality of light-emitting elements including one or more first light-emitting elements, a second light-emitting element, and a third light-emitting element, and arranged in two rows and N columns (N≥2) in the configuration area; one or more relay components including one or more first relay components arranged in the configuration area in the inter-row area of ​​the plurality of light-emitting elements arranged in two rows and N columns; a plurality of wirings for the first light-emitting elements, which connect the one or more first light-emitting elements in series and include wirings joined to the first relay components; a plurality of wirings for the second light-emitting elements, which connect the one or more second light-emitting elements in series; and a plurality of wirings for the third light-emitting elements, which connect the one or more third light-emitting elements in series.

Description

Technical Field

[0001] The present invention relates to a light emitting device. Background Art

[0002] Patent document 1 discloses a light emitting device, in which a relay component is arranged between a laser element and a lead terminal, and an electric wire for electrically connecting the laser element and the lead terminal is connected to the relay component, so that electrical connection is achieved via the relay component. Patent document 1 also discloses an embodiment in which a plurality of laser elements are arranged in a matrix, a plurality of laser elements arranged in a row are connected in series, and a plurality of laser elements can be driven independently in units of rows.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: (Japan) Patent Publication No. 2018-190750 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] Provided is a light emitting device in which a plurality of light emitting elements arranged in a row are divided into two or more groups that can be driven independently and electrically connected.

[0008] Technical solutions for solving technical problems

[0009] The light-emitting device disclosed in the embodiment comprises: a substrate having a mounting surface including a configuration area, a plurality of first wirings arranged at positions away from the configuration area in a first direction, and a plurality of second wirings arranged at positions away from the configuration area in a direction opposite to the first direction; a plurality of light-emitting elements, including one or more first light-emitting elements, one or more second light-emitting elements, and one or more third light-emitting elements, which are arranged in two rows and N columns (N≥2) within the configuration area and each have a light exit point above the mounting surface; one or more relay components, including one or more first relay components, which are arranged in the configuration area in the area between the rows of the plurality of light-emitting elements arranged in two rows and N columns; a plurality of wirings for the first light-emitting elements, which connect the one or more first light-emitting elements in series to two wirings among the plurality of first wirings and the plurality of second wirings; a plurality of wirings for the second light-emitting elements Wiring, which connects the one or more second light-emitting elements in series to two of the multiple first wirings and the multiple second wirings; multiple third light-emitting element wiring, which connects the one or more third light-emitting elements in series to two of the multiple first wirings and the multiple second wirings; at least one of the two wirings connecting the one or more first light-emitting elements in series is not connected to the second light-emitting element wiring and the third light-emitting element wiring, at least one of the two wirings connecting the one or more second light-emitting elements in series is not connected to the first light-emitting element wiring and the third light-emitting element wiring, at least one of the two wirings connecting the one or more second light-emitting elements in series is not connected to the first light-emitting element wiring and the third light-emitting element wiring, and the multiple first light-emitting element wirings include wirings connected to the first relay component.

[0010] Effects of the Invention

[0011] According to the present invention, it is possible to provide a light emitting device in which a plurality of light emitting elements arranged in a row are divided into two or more groups that can be driven independently and electrically connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view of a light emitting device according to each embodiment.

[0013] Figure 2 It is a top view of the light emitting device according to each embodiment.

[0014] Figure 3 Some components are omitted. Figure 2 A cross-sectional view of the light emitting device taken along line III-III.

[0015] Figure 4It is a plan view for explaining the wiring state of the light emitting device according to the first embodiment.

[0016] Figure 5 This is a plan view for explaining an example of definition of an inter-row region, an in-row region, and an out-of-row region in a light emitting device according to each embodiment.

[0017] Figure 6 It is a plan view for explaining the wiring state of the light emitting device according to the first modification example of the first embodiment.

[0018] Figure 7 It is a plan view for explaining the wiring state of the light emitting device according to the second modification example of the first embodiment.

[0019] Figure 8 This is a plan view for explaining a wiring state of a light emitting device according to a third modification example of the first embodiment.

[0020] Fig. 9 This is a plan view for explaining the wiring state of the light emitting device according to the fourth modification example of the first embodiment.

[0021] Fig.10 It is a plan view for explaining the wiring state of the light emitting device according to the second embodiment.

[0022] Fig.11 It is a plan view for explaining the wiring state of the light emitting device according to the first modified example of the second embodiment.

[0023] Fig.12 It is a plan view for explaining the wiring state of the light emitting device according to the second modification example of the second embodiment.

[0024] Fig.13 This is a schematic diagram of a light emitting element according to a third embodiment.

[0025] Fig.14A This is a plan view for explaining an example of conventional wiring for the light emitting element of the third embodiment.

[0026] Fig. 14B It is a plan view for explaining another example of conventional wiring with respect to the light emitting element of the third embodiment.

[0027] Fig.15A This is a plan view for explaining an example of wiring with respect to the light emitting element in the light emitting device according to the third embodiment.

[0028] Fig. 15BThis is a plan view for explaining another example of wiring of the light emitting element in the light emitting device according to the third embodiment.

[0029] Fig. 15C This is a plan view for explaining another example of wiring of the light emitting element in the light emitting device according to the third embodiment.

[0030] Fig.15D This is a plan view for explaining another example of wiring of the light emitting element in the light emitting device according to the third embodiment.

[0031] Fig.15E This is a plan view for explaining another example of wiring of the light emitting element in the light emitting device according to the third embodiment.

[0032] Fig.15F This is a plan view for explaining another example of wiring of the light emitting element in the light emitting device according to the third embodiment.

[0033] Fig.16A Yes Fig.14A , Fig. 14B , Fig.15A and Fig. 15B A diagram comparing the temperature characteristics of light output in an example of wiring.

[0034] Fig. 16B Yes Fig.14A , Fig. 14B , Fig.15A and Fig. 15B This is a diagram comparing the temperature characteristics of the forward voltage in an example of wiring.

[0035] Fig. 16C Yes Fig. 15B , Fig. 15C and Fig.15D This is a diagram comparing the temperature characteristics of the forward voltage in an example of wiring.

[0036] Fig.16D Yes Fig.15A , Fig.15E and Fig.15F This is a diagram comparing the temperature characteristics of the forward voltage in an example of wiring.

[0037] Description of Reference Numerals

[0038] 1, 2, 3 light-emitting device; 10 substrate; 12 base; 12a convex portion; 14 side wall portion; 16 wiring; 161 first wiring; 162 second wiring; 20 light-emitting element; 20A first light-emitting element; 20B second light-emitting element; 20C third light-emitting element; 21 light emission point; 21A first light emission point; 21B second light emission point; 22 waveguide; 22A first waveguide; 22B second waveguide; 30 base; 40 relay component; 40A first relay component; 40B second relay component; 40C third relay component; 40D fourth relay component; 50 reflecting component; 60 wiring; 60A wiring for the first light-emitting element; 60B wiring for the second light-emitting element; 60C wiring for the third light-emitting element; 70 sealing component; 80 lens component; A1 inter-row area; A2 in-row area; A3 out-of-row area. DETAILED DESCRIPTION

[0039] In this specification or claims, polygons such as triangles and quadrilaterals are also called polygons when the corners of the polygons are processed by rounding, chamfering, chamfering, rounding, etc. Also, not limited to corners (one end of the side), shapes processed in the middle of the side are also called polygons. In other words, shapes that retain the polygon as a basis and perform partial processing are included in the interpretation of "polygon" recorded in this specification and claims.

[0040] Furthermore, it is not limited to polygons. The same applies to words that represent specific shapes, such as trapezoids, circles, and concave-convex shapes. Furthermore, the same applies to the processing of the sides that form the shape. In other words, even if processing is performed on a corner or the middle part of a certain side, the processed part is included in the interpretation of "side". It should be noted that in the case of distinguishing a "polygon" or "side" that has not been partially processed from a processed shape, "strict" is attached, for example, it is recorded as "strict quadrilateral" etc.

[0041] Furthermore, in the present specification or claims, references to up and down, left and right, front and back, front and back, near the front, and back merely describe relative positions, orientations, directions, and the like, which may not be consistent with the relationships during use.

[0042] In addition, in the drawings, arrows are sometimes used to indicate directions such as the X direction, the Y direction, and the Z direction. The directions of the arrows correspond to each other in a plurality of drawings of the same embodiment.

[0043] Furthermore, in this specification, when describing a constituent element, for example, a "component" or "portion" may be used. A "component" refers to an object that is physically treated as a single entity. An object that is physically treated as a single entity refers to an object that can be treated as a component in a manufacturing process. On the other hand, a "portion" may refer to an object that is not physically treated as a single entity. For example, "portion" is used when partially referring to a part of a component.

[0044] It should be noted that the distinction between "components" and "parts" mentioned above is not intended to limit the claims intentionally based on the principle of equivalents. In other words, even if there is a component described as a "component" in the claims, the applicant does not believe that treating the component as a single body physically is an indispensable condition for the application of the present invention based on the description alone.

[0045] Furthermore, in this specification or claims, when there are multiple constituent elements and they are distinguished and expressed separately, there are cases where "first" or "second" is added before the constituent element to distinguish them. In addition, there are cases where the objects distinguished in this specification and the claims are different. Therefore, even if the claims record constituent elements with the same annotations as in this specification, there are cases where the objects specified by the constituent elements are inconsistent between this specification and the claims.

[0046] For example, in this specification, there are constituent elements that are distinguished by being marked as "first", "second" and "third". When the constituent elements annotated as "first" and "third" in this specification are recorded in the claims, from the perspective of easy identification, there is a case where the constituent elements are distinguished by being annotated as "first" and "second" in the claims. In this case, the constituent elements annotated as "first" and "second" in the claims refer to the constituent elements annotated as "first" and "third" in this specification, respectively. It should be noted that the application of this rule is not limited to constituent elements, and it can also be used reasonably and flexibly for other objects.

[0047] The specific implementation method is described below. In addition, the specific scheme for implementing the present invention is described while referring to the accompanying drawings. It should be noted that the scheme for implementing the present invention is not limited to the specific scheme. In other words, the illustrated implementation method is not the only scheme for implementing the present invention. It should be noted that the size or positional relationship of the components shown in the various drawings is exaggerated for ease of understanding.

[0048] <First embodiment>

[0049] A light emitting device 1 according to the first embodiment will be described. Figures 1 to 5 The drawings are for explaining an exemplary embodiment of the light emitting device 1 . Figure 1 It is a perspective view of the light emitting device 1 . Figure 2 is a top view of the light emitting device 1 . Figure 3 yes Figure 2 It should be noted that in Figure 3 In order to avoid complicating the figure, the components arranged on the base 12 are omitted. Figure 4 It is a plan view for explaining a wiring state for electrically connecting a plurality of light emitting elements included in the light emitting device 1 . Figure 5 It is a plan view showing an example of definition of an inter-row region, an intra-row region, and an extra-row region, which will be described later, in the light emitting device 1 .

[0050] The light emitting device 1 includes a plurality of components, including a base 10 , a plurality of light emitting elements 20 , a plurality of bases 30 , one or more relay members 40 , a plurality of reflecting members 50 , a plurality of wirings 60 , a sealing member 70 , and a lens member 80 .

[0051] It should be noted that the light emitting device 1 may include other components. For example, the light emitting device 1 may include a light emitting element in addition to the plurality of light emitting elements 20. Furthermore, the light emitting device 1 may not include some of the components listed here.

[0052] First, each component of the light emitting device 1 will be described.

[0053] (Substrate 10)

[0054] The base 10 has a base 12 and a side wall 14. The base 12 has a mounting surface on which other components are mounted. The side wall 14 surrounds the mounting surface. The mounting surface is the upper surface of the base 12, and the side wall 14 constitutes a side wall extending upward from the mounting surface.

[0055] The base 12 has a convex portion 12a. That is, the base 12 has a first surface and a second surface located above the first surface, and one or more side surfaces connecting the first surface and the second surface. The second surface can be a mounting surface. The side wall can be formed laterally compared to the second surface. That is, the side wall portion 14 can be formed in a manner that surrounds the entire second surface.

[0056] The shape of the area surrounded by the side wall portion 14 in the base 12 is rectangular. The length of the long side of the rectangle can be in the range of 15 mm to 35 mm, and the length of the short side can be in the range of 10 mm to 25 mm. The long side can be 1.4 times or more and 2.5 times or less of the short side. In the example of the base 10 shown in the figure, the long side is parallel to the X direction, and the short side is parallel to the Y direction.

[0057] In a top view, the mounting surface is rectangular. The long side of the rectangle is parallel to the long side of the area surrounded by the side wall portion 14, and the short side of the rectangle is parallel to the short side of the area surrounded by the side wall portion 14. The long side of the rectangle can be 0.75 times or more and less than 1 times the long side of the area surrounded by the side wall portion 14. The short side of the rectangle can be 0.7 times or more and less than 1 times the short side of the area surrounded by the side wall portion 14.

[0058] The base 12 and the side wall 14 may be formed by different parts. For example, the side wall 14 may be formed by a base part mainly made of copper, copper tungsten, copper molybdenum, steel, or iron, and the side wall 14 may be formed by a wall part mainly made of steel or iron. As a specific example, the base 10 formed by joining a base part mainly made of oxygen-free copper and a wall part mainly made of mild steel having a carbon content in the range of 0.12% or more and 0.30% or less may be cited.

[0059] The main material refers to the material that accounts for the largest proportion by weight or volume in the object. It should be noted that when the object is formed by one material, the material is the main material. In other words, a certain material is the main material and the proportion of the material is 100%.

[0060] It should be noted that, when the base 12 and the side wall 14 are made of different materials as described above, the base 12 has a shape of a convex portion 12a, so that the warping of the mounting surface can be suppressed. It should be noted that the shape of the base 10 is not limited to this, and can be, for example, a flat plate. If the base 10 is a flat plate, it does not have the side wall 14.

[0061] The base 10 further has a plurality of wirings 16. The plurality of wirings 16 include a first wiring 161 and a second wiring 162 facing each other across the mounting surface. The plurality of wirings 16 include a plurality of first wirings 161. The plurality of wirings 16 include a plurality of second wirings 162. The plurality of wirings 16 include a plurality of first wirings 161 and the same number of second wirings 162.

[0062] Each wiring 16 has an inner wiring region provided inside the side wall and an outer wiring region provided outside the side wall. The inner wiring region and the outer wiring region of the wiring 16 are electrically connected. For example, the wiring 16 is provided through the side wall portion 14.

[0063] The wiring 16 may be, for example, a pin penetrating the side wall portion 14. Also, for example, the wiring 16 may be a metal film provided on the upper surface of the base 10. The wiring 16 may be formed using, for example, a metal such as kovar, copper, or iron as a main material.

[0064] (Light emitting element 20)

[0065] The light emitting element 20 emits light. The light emitting element 20 has an upper surface, a lower surface, and one or more side surfaces, one or more of which become light exit surfaces from which light is emitted. The light emitting element 20 emits light from one or more exit points of the light exit surface. This point is called a light exit point. As a specific example of the light emitting element 20, a semiconductor laser element can be cited.

[0066] For example, a light emitting element emitting blue light, a light emitting element emitting green light, or a light emitting element emitting red light can be used as the light emitting element 20. It should be noted that a light emitting element emitting light of other colors can be used as the light emitting element 20.

[0067] Here, blue light refers to light whose emission peak wavelength is within the range of 420nm to 494nm. Green light refers to light whose emission peak wavelength is within the range of 495nm to 570nm. Red light refers to light whose emission peak wavelength is within the range of 605nm to 750nm.

[0068] Here, the semiconductor laser element is described. In a top view, the semiconductor laser element has a rectangular shape with one opposite side as the long side and the other opposite side as the short side. The semiconductor laser element is formed by stacking a plurality of semiconductor layers including an active layer from the lower surface to the upper surface. The side surface including one of the two short sides of the rectangle is the exit end face from which the light is emitted. It should be noted that the exit end face of the semiconductor laser element can also be called the light exit surface of the light emitting element 20. The upper surface and the lower surface of the semiconductor laser element are larger in area than the exit end face.

[0069] The light (laser) emitted from a semiconductor laser element has divergence. Divergent light is emitted from the emission end face of the semiconductor laser element. The light emitted from the semiconductor laser element forms an elliptical far-field pattern (hereinafter referred to as "FFP") in a plane parallel to the emission end face of the semiconductor laser element. FFP refers to the shape and light intensity distribution of the emitted light at a position away from the emission end face.

[0070] Here, light passing through the center of the elliptical shape of the FFP, in other words, light with peak intensity in the light intensity distribution of the FFP, is referred to as light traveling along the optical axis or light passing through the optical axis. Also, in the light intensity distribution of the FFP, the light with a 1 / e value relative to the peak intensity value is referred to as 2 Light of the above intensity is called the main part of light.

[0071] The shape of the FFP of the light emitted from the semiconductor laser element is an elliptical shape in which the stacking direction is longer than the direction perpendicular to the stacking direction. The stacking direction refers to the direction in which multiple semiconductor layers including an active layer in the semiconductor laser element are stacked. The direction perpendicular to the stacking direction can also be called the surface direction of the semiconductor layer. In addition, the long-diameter direction of the elliptical shape of the FFP can be called the fast-axis direction of the semiconductor laser element, and the short-diameter direction can be called the slow-axis direction of the semiconductor laser element.

[0072] The light emitted from the semiconductor laser element is divergent light. Here, 1 / e of the peak light intensity based on the light intensity distribution of FFP is 2 The angle at which light with the same intensity is dispersed is called the light divergence angle of the semiconductor laser element. The light divergence angle is 1 / e of the peak light intensity. 2 In addition to the light intensity of the peak light intensity, there are cases where the light intensity can be obtained from the half value of the peak light intensity. In the description of this specification, when simply referred to as "light divergence angle", it means 1 / e of the peak light intensity. 2 It should be noted that the divergence angle in the fast axis direction is greater than the divergence angle in the slow axis direction.

[0073] As a semiconductor laser element emitting blue light or a semiconductor laser element emitting green light, a semiconductor laser element including a nitride semiconductor can be cited. As a nitride semiconductor, for example, GaN, InGaN, and AlGaN can be used. As a semiconductor laser element emitting red light, a semiconductor including an InAlGaP system, a GaInP system, a GaAs system, or an AlGaAs system can be cited.

[0074] (Abutment 30)

[0075] The base 30 has a lower surface, an upper surface and one or more side surfaces. The width of the base 30 in the vertical direction is the smallest. The base 30 is formed in a rectangular parallelepiped shape. It should be noted that the shape is not limited to a rectangular parallelepiped. The base 30 can be formed of aluminum nitride, silicon nitride or silicon carbide as the main material, for example.

[0076] (Relay component 40)

[0077] The relay component 40 has a lower surface, an upper surface and one or more side surfaces. The width of the relay component 40 in the vertical direction is the smallest. The relay component 40 is formed in a rectangular parallelepiped shape. It should be noted that the shape is not limited to a rectangular parallelepiped. The relay component 40 can be formed of silicon nitride, aluminum nitride or silicon carbide, aluminum oxide as the main material.

[0078] (Reflection member 50)

[0079] The reflecting component 50 has a light reflecting surface for reflecting light. The reflecting component 50 has a lower surface and an upper surface, and the light reflecting surface is inclined relative to the lower surface of the reflecting component 50. In other words, the light reflecting surface is neither perpendicular nor parallel to the lower surface of the reflecting component 50. The light reflecting surface is a plane, and is inclined at an angle of 45 degrees relative to the lower surface of the reflecting component 50. It should be noted that the light reflecting surface may not be a plane, and its inclination angle may not be 45 degrees.

[0080] The reflective component 50 can be formed with glass or metal as the main material. The main material can be a heat-resistant material, for example, glass such as quartz or BK7 (borosilicate glass), or metal such as aluminum. In addition, the reflective component 50 can be formed with Si as the main material. If the main material is a reflective material, a light reflecting surface can be formed from the main material. In the case of forming a light reflecting surface different from the main material, for example, a metal film such as Ag, Al, or a dielectric multilayer film such as Ta2O5 / SiO2, TiO2 / SiO2, or Nb2O5 / SiO2 can be formed to form the light reflecting surface.

[0081] The reflectivity of the light reflecting surface relative to the peak wavelength of the light irradiated on the light reflecting surface is 90% or more. Furthermore, the reflectivity may be 95% or more. It should be noted that the reflectivity here is 100% or less.

[0082] (Wiring 60)

[0083] The wiring 60 is composed of a conductor having a linear shape with two ends forming a joint portion. In other words, the wiring 60 has a joint portion joined to other components at both ends of the linear portion. The wiring 60 is used for electrical connection between two components. As the wiring 60, for example, an electric wire mainly made of metal can be used. Examples of metals include gold, aluminum, silver, copper, etc.

[0084] (Sealing member 70)

[0085] The sealing member 70 has an upper surface and a lower surface. The sealing member 70 has a light-transmitting portion with high light transmittance from the upper surface to the lower surface. It should be noted that having high light transmittance means that the transmittance to light is 80% or more. It should be noted that the transmittance to light of all wavelengths may not be 80% or more.

[0086] The sealing member 70 may be composed of a frame member having one or more openings and one or more light-transmitting members covering the one or more openings. In this case, the frame member may not have high light transmittance. The light-transmitting member includes a light-transmitting portion.

[0087] The light-transmitting portion of the sealing member 70 can be formed using a light-transmitting material such as glass, sapphire, or quartz as a main material. The main material of the frame member can be, for example, metal.

[0088] (Lens component 80)

[0089] The lens component 80 has an upper surface, a lower surface, a side surface and a plurality of lens surfaces. The plurality of lens surfaces are arranged on the upper surface side. The plurality of lens surfaces are arranged in a matrix of two rows and N columns (N is a natural number greater than 2). It should be noted that the lens surfaces may also be arranged on the lower surface side.

[0090] The upper surface and the lower surface are planes. A plurality of lens surfaces intersect the upper surface. In a top view, the plurality of lens surfaces are surrounded by the upper surface. In a top view, the lens component 80 has a rectangular shape. The lower surface of the lens component 80 is rectangular.

[0091] Here, in the lens component 80, the portion overlapping with the plurality of lens surfaces in the top view is the lens portion. In the lens component 80, the portion overlapping with the upper surface in the top view is the non-lens portion. The lens portion is a lens-shaped portion when the lens surface side is divided into two parts by an imaginary plane including the upper surface, and a flat-plate-shaped portion is used as the lower surface side. The lower surface of the lens portion is a part of the lower surface of the lens component 80.

[0092] The lens component 80 has high light transmittance. The lens portion is formed to have high light transmittance as a whole. The lens component 80 can be formed using a light-transmitting material such as glass or synthetic quartz as a main material.

[0093] (Light-emitting device 1)

[0094] Next, the light emitting device 1 including the above-mentioned components will be described.

[0095] In the light emitting device 1, a plurality of light emitting elements 20 are arranged on a substrate 10. The plurality of light emitting elements 20 are arranged on the mounting surface of the substrate 10. The light emission points of the plurality of light emitting elements 20 are all located above the mounting surface. The plurality of light emitting elements 20 are arranged within the arrangement area of ​​the mounting surface. In other words, the area within the mounting surface that can surround the plurality of light emitting elements 20 arranged on the mounting surface is regarded as the arrangement area.

[0096] The plurality of light emitting elements 20 are arranged in a matrix. The plurality of light emitting elements 20 are arranged in two rows and N columns (N is a natural number greater than 2). The light emission points of the N light emitting elements 20 arranged in the same row can be arranged at equal intervals in the row direction. It should be noted that the light emitting device 1 can further arrange the plurality of light emitting elements in a matrix of more than three rows as a whole. Similarly, the light emitting elements can be further arranged in a manner that the number of columns is greater than N.

[0097] The interval between adjacent light emitting elements 20 in the row direction is 1.2 mm or more and 4 mm or less. The interval between adjacent light emitting elements 20 in the row direction is smaller than the interval between adjacent light emitting elements 20 in the column direction. The interval between adjacent light emitting elements 20 in the column direction is 4 mm or more and 8 mm or less.

[0098] In the example of the light emitting device 1 shown in the figure, the row direction in the matrix is ​​parallel to the X direction, and the column direction is parallel to the Y direction. In addition, a semiconductor laser element is used as the light emitting element 20. In addition, the plurality of light emitting elements 20 are arranged in two rows and seven columns. It should be noted that the plurality of light emitting elements 20 can be arranged in three or more columns. Thus, the length direction of the configuration area can correspond to the length direction of the mounting surface, and the plurality of light emitting elements can be arranged in an efficient arrangement manner.

[0099] The first wiring 161 and the second wiring 162 are arranged at positions away from the configuration area in the opposite direction, based on the configuration area. The plurality of first wirings 161 are arranged at positions away from the configuration area in the first direction, and the plurality of second wirings 162 are arranged at positions away from the configuration area in the direction opposite to the first direction.

[0100] In the example of the light emitting device 1 shown in the figure, the first direction and the direction opposite to the first direction are parallel to the X direction. The first wirings 161 and the second wirings 162 are provided in the same number as the number of rows of the plurality of light emitting elements 20 arranged in a matrix. That is, the first wirings 161 and the second wirings 162 are each composed of two wirings 16.

[0101] The plurality of light emitting elements 20 include one or more first light emitting elements 20A, one or more second light emitting elements 20B, and one or more third light emitting elements 20C. The first light emitting element 20A, the second light emitting element 20B, and the third light emitting element 20C are electrically connected so as to be independently drivable. The details of the connection will be described later.

[0102] The first light emitting element 20A, the second light emitting element 20B, and the third light emitting element 20C emit lights of different colors from each other. The first light emitting element 20A, the second light emitting element 20B, and the third light emitting element 20C can emit lights of different colors selected from red light, green light, and blue light.

[0103] It should be noted that the plurality of first light emitting elements 20A emit light of the same color, and the difference in peak wavelength of the emitted light within the plurality of first light emitting elements 20A is within 30 nm. The same is true for the second light emitting element 20B and the third light emitting element 20C.

[0104] The plurality of first light emitting elements 20A may include two or more first light emitting elements 20A each of which emits light with a peak wavelength that is different in the range of 3 nm to 10 nm. Preferably, the difference in peak wavelength is 3 nm to 5 nm. For example, when the laser light emitted from the light emitting device 1 is used for image display, speckle noise can be alleviated by emitting light with different peak wavelengths in the same color. The second light emitting element 20B and the third light emitting element 20C may also be configured to emit a plurality of lights with different peak wavelengths.

[0105] In the example of the light emitting device 1 shown in the figure, the first to seventh columns of the second row are first light emitting elements 20A, the first, second, sixth and seventh columns of the first row are second light emitting elements 20B, and the third to fifth columns of the first row are third light emitting elements 20C. The first light emitting element 20A emits red light, the second light emitting element 20B emits green light, and the third light emitting element 20C emits blue light.

[0106] In the example of the light emitting device 1 shown in the figure, the plurality of first light emitting elements 20A include a first light emitting element 20A whose peak wavelength of emitted light is a first wavelength, and a first light emitting element 20A whose peak wavelength of emitted light is a second wavelength greater than the first wavelength. The second wavelength is larger than the first wavelength in the range of 3 nm to 10 nm. In addition, the plurality of first light emitting elements 20A include a first light emitting element 20A whose peak wavelength of emitted light is a third wavelength greater than the second wavelength. The third wavelength is larger than the second wavelength in the range of 3 nm to 10 nm.

[0107] Preferably, the third wavelength is larger than the first wavelength in a range of 3 nm to 10 nm. In addition, the second wavelength is larger than the first wavelength in a range of 3 nm to 5 nm, and the third wavelength is larger than the second wavelength in a range of 3 nm to 5 nm. In a plurality of light-emitting elements emitting light of the same color, by suppressing the maximum and minimum difference between the peak wavelengths of the light to less than 10 nm, light having no significant color variation range can be emitted.

[0108] The plurality of light emitting elements 20 are arranged in such a manner that their light emitting surfaces face the side. The plurality of light emitting elements 20 are arranged in such a manner that their respective light emitting surfaces face the same direction. It should be noted that the same direction here refers to the situation where each light emitting surface converges within a range of ±5 degrees in a top view. In the example of the light emitting device 1 shown in the figure, the light emitting surface of the light emitting element 20 is parallel to the X direction and perpendicular to the Y direction. Furthermore, the optical axis of the light emitted from the plurality of light emitting elements 20 is parallel to the Y direction.

[0109] The light emitting elements 20 are respectively arranged on the bases 30. The light emitting elements 20 are arranged on the mounting surface via the bases 30. A plurality of light emitting elements 20 are arranged on a plurality of bases 30. The bases 30 are provided one to one with respect to the light emitting elements 20.

[0110] The plurality of bases 30 include two or more bases 30 of different sizes in a plan view. In the example of the light emitting device 1 shown in the figure, the first light emitting element 20A is bonded to the base 30 of a relatively larger area among the two bases 30 of different sizes. Thus, the heat dissipation performance relative to the first light emitting element 20A can be improved.

[0111] The plurality of reflective components 50 are arranged on the base 10. The plurality of reflective components 50 are arranged on the mounting surface of the base 10. The plurality of reflective components 50 are arranged in the arrangement region of the mounting surface. In other words, the area within the mounting surface surrounded by the plurality of reflective components 50 arranged on the mounting surface and the light emitting element 20 can be regarded as the arrangement region.

[0112] The plurality of reflective components 50 reflect the light emitted from the plurality of light emitting elements 20. The light reflected by the reflective component 50 advances upward. The light reflecting surface of the reflective component 50 is inclined at an angle of 45 degrees relative to the advancing direction of the light passing through the optical axis. The light passing through the optical axis is reflected by the reflective component 50 and advances in a direction perpendicular to the mounting surface. This direction is parallel to the Z direction.

[0113] The plurality of reflective members 50 reflects a major portion of the light emitted from the plurality of light emitting elements 20. Hereinafter, the reflective member 50 that reflects a major portion of the light emitted from the light emitting element 20 will be referred to as the reflective member 50 corresponding to the light emitting element 20.

[0114] The multiple reflective components 50 include one or more reflective components 50 corresponding to one or more first light-emitting elements 20A, one or more reflective components 50 corresponding to one or more second light-emitting elements 20B, and one or more reflective components 50 corresponding to one or more third light-emitting elements 20C.

[0115] The reflective components 50 are arranged one-to-one with respect to the light emitting elements 20. The multiple reflective components 50 are arranged in a matrix. The multiple reflective components 50 are arranged in two rows and N columns (N is a natural number greater than 2). The N reflective components 50 arranged in the same row are arranged at equal intervals. It should be noted that the multiple reflective components 50 may include reflective components 50 corresponding to the multiple light emitting elements 20 arranged in succession.

[0116] For example, the plurality of reflective components 50 may include reflective components 50 corresponding to the plurality of first light emitting elements 20A arranged in series, reflective components 50 corresponding to the plurality of second light emitting elements 20B arranged in series, and reflective components 50 corresponding to the plurality of third light emitting elements 20C arranged in series.

[0117] The light reflecting surface of the reflective member 50 reflects more than 90% of the main part of the irradiated light. It should be noted that the light emitting device 1 may not include the reflective member 50. In this case, for example, the emission end surface of the light emitting element 20 faces upward.

[0118] One or more relay members 40 are arranged on the base 10. One or more relay members 40 are arranged on the mounting surface of the base 10. One or more relay members 40 include one or more first relay members 40A arranged in the inter-row region of the plurality of light emitting elements 20 arranged in two rows and N columns.

[0119] The inter-row region refers to the region between the rows of the plurality of components arranged in two rows and N columns, and is the region between the components in the first row and the components in the second row. Therefore, the inter-row region of the plurality of light-emitting elements 20 arranged in two rows, the inter-row region of the plurality of reflective components 50 arranged in two rows, the inter-row region of the plurality of light-emitting elements 20 arranged in the first row and the plurality of reflective components 50 arranged in the second row, and the inter-row region of the plurality of reflective components 50 arranged in the first row and the plurality of light-emitting elements 20 arranged in the second row can be separately defined. Hereinafter, they are referred to as the first inter-row region, the second inter-row region, the third inter-row region, and the fourth inter-row region, respectively.

[0120] The inter-row area is an area sandwiched between two imaginary lines parallel to the row direction in a top view. The two imaginary lines are an imaginary line passing through the first row closest to the second row of components arranged in multiple columns, and an imaginary line passing through the second row closest to the first row of components arranged in multiple columns. Figure 5 In FIG. 1 , as an example of the inter-line area, the first inter-line area A1 is indicated by hatching.

[0121] One or more first relay components 40A are arranged in the area overlapping the first inter-row area, the second inter-row area, the third inter-row area, and the fourth inter-row area. One or more first relay components 40A are arranged in the inter-row area of ​​the third inter-row area and the fourth inter-row area that does not include the plurality of light emitting elements 20 and the plurality of reflective components 50 in the area.

[0122] The one or more relay components 40 include one or more second relay components 40B arranged in the out-of-row region of the plurality of light emitting elements 20 arranged in two rows and N columns. The out-of-row region refers to a region of one of the two rows that does not include the constituent elements, with the imaginary line parallel to the row direction passing through the farthest position from the other row among the constituent elements arranged in multiple columns in one of the two rows as the boundary.

[0123] Therefore, it is possible to separately define an out-of-row area based on a plurality of light emitting elements 20 arranged in the first row, an out-of-row area based on a plurality of reflective components 50 arranged in the first row, an out-of-row area based on a plurality of light emitting elements 20 arranged in the second row, and an out-of-row area based on a plurality of reflective components 50 arranged in the second row. Hereinafter, they are referred to as the first out-of-row area, the second out-of-row area, the third out-of-row area, and the fourth out-of-row area, respectively. Figure 5 In FIG. 1 , as an example of the out-of-row area, the first out-of-row area A3 is indicated by hatching.

[0124] The one or more relay components 40 include one or more third relay components 40C, which are joined to the other end of the wiring 60 whose one end is joined to the wiring 16. The third relay component 40C is arranged at a position away from the light emitting element 20 located at one end of the plurality of light emitting elements 20 arranged in the row direction in the direction opposite to the direction in which the adjacent light emitting element 20 is arranged. In contrast to the third relay component 40C, the first relay component 40A and the second relay component 40B may also be relay components 40 whose both ends are joined to the wiring 60 not joined to the wiring 16.

[0125] It should be noted that the in-row area other than the inter-row area and the out-row area can be specified. The in-row area refers to the area sandwiched between the inter-row area and the out-row area determined based on the components arranged in multiple columns in the same row. Figure 5 In FIG. 1 , as an example of the inter-row region, the in-row region A2 based on the light emitting elements 20 arranged in the first row is indicated by hatching. The in-row region A2 is a region sandwiched between the first inter-row region A1 and the first out-of-row region A3.

[0126] exist Figure 4 In the example of the light emitting device 1 shown, the relay member 40 is arranged in the row region based on the light emitting elements 20 arranged in the first row. Also, the relay member 40 is arranged in the row region based on the reflective members 50 arranged in the first row.

[0127] The plurality of wirings 60 are provided to electrically connect the plurality of light emitting elements 20 and the plurality of wirings 16. The plurality of wirings 60 include a plurality of first light emitting element wirings 60A that connect one or more first light emitting elements 20A and two wirings 16 of the plurality of first wirings 161 and the plurality of second wirings 162 in series.

[0128] The plurality of wirings 60 include a plurality of second light emitting element wirings 60B that connect one or more second light emitting elements 20B in series with two wirings 16 among the plurality of first wirings 161 and the plurality of second wirings 162 .

[0129] The plurality of wirings 60 include a plurality of third light emitting element wirings 60C that connect one or more third light emitting elements 20C in series with two wirings 16 among the plurality of first wirings 161 and the plurality of second wirings 162 .

[0130] The first light emitting element wiring 60A is connected to each of the two wirings 16 that connect one or more first light emitting elements 20A in series. The second light emitting element wiring 60B and the third light emitting element wiring 60C are not connected to at least one of the two wirings 16 .

[0131] The second light emitting element wiring 60B is connected to each of the two wirings 16 that connect one or more second light emitting elements 20B in series. The first light emitting element wiring 60A and the third light emitting element wiring 60C are not connected to at least one of the two wirings 16 .

[0132] The third light emitting element wiring 60C is connected to each of the two wirings 16 that connect one or more third light emitting elements 20C in series. The first light emitting element wiring 60A and the second light emitting element wiring 60B are not connected to at least one of the two wirings 16 .

[0133] The plurality of wirings 16 include a wiring 16 connected to the first light emitting element wiring 60A, the second light emitting element wiring 60B, and the third light emitting element wiring 60C. The wiring 16 is one wiring 16 among the plurality of first wirings 161 and the plurality of second wirings 162.

[0134] The plurality of first light-emitting element wirings 60A include wirings 60 joined to the first relay component 40A. It should be noted that the first relay component 40A may be a first relay component 40A based on any one of the first to fourth inter-row regions. The plurality of first light-emitting element wirings 60A include a plurality of wirings 60 joined to one or more first relay components 40A and a plurality of wirings 60 joined to one or more first light-emitting elements 20A or one or more bases 30 on which the one or more first light-emitting elements 20A are placed.

[0135] One or more first light emitting elements 20A are electrically connected to two first wirings 161. A plurality of first light emitting element wirings 60A are joined to one or more first relay components 40A, which are located on the opposite side of the one or more first light emitting elements 20A via one or more reflective components 50 corresponding to the one or more first light emitting elements 20A.

[0136] Furthermore, the plurality of first light emitting element wirings 60A are joined to the one or more first light emitting elements 20A and the one or more first relay members 40A so as to surround the one or more reflecting members 50 corresponding to the one or more first light emitting elements 20A.

[0137] In the example of the light emitting device 1 shown in the figure, the plurality of first light emitting element wirings 60A are joined in such a manner that the plurality of first light emitting elements 20A arranged in the row direction, the plurality of relay components 40, and the other first wiring 161 are sequentially connected starting from the first wiring 161 closer to the first light emitting element 20A among the two first wirings 161. Furthermore, there is no first light emitting element wiring 60A that passes between adjacent reflecting components 50 of the plurality of reflecting components 50 arranged in the row direction corresponding to the plurality of first light emitting elements 20A.

[0138] The plurality of second light-emitting element wirings 60B include wirings 60 joined to the second relay components 40B. It should be noted that the second relay components 40B are second relay components 40B arranged in the row-out region based on the second light-emitting element 20B or second relay components 40B arranged in the row-out region based on the reflective component 50 corresponding to the second light-emitting element 20B. The plurality of second light-emitting element wirings 60B include a plurality of wirings 60 joined to one or more second relay components 40B and a plurality of wirings 60 joined to one or more second light-emitting elements 20B or one or more bases 30 on which one or more second light-emitting elements 20B are placed.

[0139] One or more second light-emitting elements 20B are electrically connected to one first wiring 161 and one second wiring 162. Multiple second light-emitting element wirings 60B are joined to one or more second relay components 40B, which are located on the opposite side of one or more third light-emitting elements 20C across one or more reflective components 50 corresponding to one or more third light-emitting elements 20C. Multiple second light-emitting element wirings 60B include second light-emitting element wirings 60B, which are joined to relay components 40 arranged between two reflective components 50 respectively corresponding to the second light-emitting elements 20B and the third light-emitting elements 20C arranged adjacent to each other in the row direction. The relay component 40 is a second relay component 40B arranged in an area outside the row based on the second light-emitting element 20B. As a result, the electrical connection of the second light-emitting element 20B can be achieved by avoiding the third light-emitting element 20C.

[0140] In the example of the light emitting device 1 shown in the figure, one or more second light emitting elements 20B arranged in one direction from the third light emitting element 20C and one or more second light emitting elements 20B arranged in the direction opposite to the one direction from the third light emitting element 20C are arranged in the same row. These are respectively referred to as the second light emitting element 20B on one side and the second light emitting element 20B on the other side, and the plurality of second light emitting elements are connected by wiring 60B in a manner that the second light emitting element 20B on one side, the plurality of relay components 40, the second light emitting element 20B on the other side, and the second wiring 162 are sequentially connected starting from the first wiring 161.

[0141] The plurality of third light-emitting element wirings 60C include wirings 60 joined to the first relay component 40A. It should be noted that the first relay component 40A may be a first relay component 40A based on any one of the first to fourth inter-row regions. The plurality of third light-emitting element wirings 60C include wirings 60 joined to one or more first relay components 40A arranged in a position further forward in the direction in which the first wiring 161 is provided than the third light-emitting element 20C closest to the first wiring 161 in the row direction. Furthermore, the plurality of third light-emitting element wirings 60C include wirings 60 joined to one or more first relay components 40A arranged in a position further forward in the direction in which the second wiring 162 is provided than the third light-emitting element 20C closest to the second wiring 162 in the row direction.

[0142] One or more third light emitting elements 20C are electrically connected to one first wiring 161 and one second wiring 162. The plurality of third light emitting element wirings 60C are connected to one or more first relay components 40A in the inter-row region that are closer to the third light emitting element 20C in the column direction than the first relay component 40A connected to the first light emitting element wiring 60A. The plurality of third light emitting element wirings 60C include the third light emitting element wiring 60C connected to the relay component 40 arranged between the second light emitting element 20B and the third light emitting element 20C arranged adjacent to each other in the row direction. The one or more first relay components 40A include the first relay component 40A connected to the other end of the wiring 60 connected to the third light emitting element 20C or the base 30 on which the third light emitting element 20C is placed, and connected to the other end of the wiring 60 connected to the first relay component 40A connected to the first light emitting element wiring 60A.

[0143] In the example of the light-emitting device 1 shown in the figure, a plurality of third light-emitting elements are joined by wiring 60C in a manner that starts from the first wiring 161 and sequentially connects one or more first relay components 40A, a plurality of third light-emitting elements 20C arranged in a row direction, one or more first relay components 40A, and the second wiring 162.

[0144] One or more relays 40 include relays 40 connected to the first light emitting device wiring 60A and the second light emitting device wiring 60B. The plurality of wirings 60 include wirings 60 that are both the first light emitting device wiring 60A and the first light emitting device wiring 60B. This simplifies wiring.

[0145] The one or more relay components 40 include a relay component 40 connected to the first light emitting element wiring 60A and the third light emitting element wiring 60C. In addition, the relay component 40 may be the first relay component 40A. The plurality of wirings 60 include wirings 60 that are both the first light emitting element wiring 60A and the third light emitting element wiring 60C. Thus, the two current paths can be merged at a desired position in the inter-row region.

[0146] The relay 40 to which the first light emitting device wiring 60A and the second light emitting device wiring 60B are connected can be different from the relay 40 to which the first light emitting device wiring 60A and the third light emitting device wiring 60C are connected.

[0147] In this way, if the current paths are combined, the plurality of wirings 60 include wirings 60 that function only as the first light emitting element wiring 60A, wirings 60 that function only as the second light emitting element wiring 60B, wirings 60 that function only as the third light emitting element wiring 60C, and wirings 60 that function at least as the first light emitting element wiring 60A and the second light emitting element wiring 60B. Furthermore, the plurality of wirings 60 may further include wirings 60 that function at least as the first light emitting element wiring 60A and the third light emitting element wiring 60C. Furthermore, the plurality of wirings 60 include wirings 60 that function as the first light emitting element wiring 60A, the second light emitting element wiring 60B, and the third light emitting element wiring 60C.

[0148] The plurality of relay components 40 include a relay component 40 at which the current paths of the first light emitting element 20A, the second light emitting element 20B, and the third light emitting element 20C merge. The relay component 40 may be the third relay component 40C. The wiring 60 joined to the first relay component 40A does not include a wiring 60 that functions as the first light emitting element wiring 60A, functions as the second light emitting element wiring 60B, and further functions as the third light emitting element wiring 60C.

[0149] In the example of the light-emitting device 1 shown in the figure, the current path electrically connecting the plurality of first light-emitting elements 20A to the two wirings 16 includes a first path electrically connecting only the first light-emitting element 20A, a second path electrically connecting only the first light-emitting element 20A and the third light-emitting element 20C, and a third path electrically connecting the first light-emitting element 20A, the second light-emitting element 20B, and the third light-emitting element 20C. In addition, the physical length of each path becomes shorter in the order of the first path, the second path, and the third path. The path length of the first path is more than twice the sum of the path length of the second path and the path length of the third path.

[0150] In the light emitting device 1, the plurality of relay components 40 include relay components 40 whose area as viewed in a plan view is smaller than that of the base 30. The area as viewed in a plan view of all the plurality of relay components 40 can be smaller than that of the base 30. Thus, it is possible to provide convenience in selecting the number and positions of the plurality of relay components 40 arranged in the inter-row area.

[0151] The number of relays 40 arranged in the light emitting device 1 may be greater than 2×N. The number of relays 40 arranged in the light emitting device 1 may be greater than the number of light emitting elements 20. The number of relays 40 arranged in the light emitting device 1 may be greater than the number of bases 30.

[0152] The relay component 40 is formed of the same material as the base 30, that is, the same main material. It should be noted that the relay component 40 may be formed using a main material different from that of the base 30. In this case, it is preferred that the thermal conductivity of the base 30 is higher than that of the relay component 40. In the base 30, it is preferred to consider the heat dissipation with respect to the heat generated from the light emitting element 20. On the other hand, since the light emitting element 20 is not mounted on the relay component 40, it is also conceivable that the thermal conductivity may be lower than that of the base 30.

[0153] The sealing member 70 seals the space where the plurality of light emitting elements 20 are arranged. The light emitting elements 20 can be arranged in the airtightly sealed space. This can suppress the deterioration of light quality due to the influence of dust on the light emitting elements 20.

[0154] The sealing member 70 is arranged on the side wall of the base 10. The upper surface of the side wall and the lower surface of the sealing member 70 are bonded. The frame member of the sealing member 70 is bonded to the side wall. The light reflected by the reflecting member 50 passes through the sealing member 70. The main part of the light passes through the light-transmitting portion of the sealing member 70 and is emitted from the sealing member 70. More than 90% of the main part of the light emitted from the light-emitting element 20 is emitted from the sealing member 70.

[0155] The lens component 80 is located above the plurality of light emitting elements 20. The lens component 80 is disposed above the sealing component 70. The lens component 80 is bonded to the sealing component 70. The lens component 80 is bonded using, for example, a UV curable adhesive. If a UV curable adhesive is used, the mounting position of the lens component 80 can be adjusted, so that it can be bonded at a desired position.

[0156] The lens member 80 is arranged so that the light emitted from each light emitting element 20 passes through each lens surface and is emitted.

[0157] <Modification of the first embodiment>

[0158] Next, a light emitting device according to a modification of the first embodiment is described. A plurality of modifications are provided below, and the configuration of the plurality of light emitting elements 20 of the light emitting device according to each modification is different from that of the light emitting device 1 according to the first embodiment. Therefore, the connection method of the wiring 60 or the configuration of the relay component 40 is different due to the different configuration of the plurality of light emitting elements 20.

[0159] In the light emitting devices of the modifications, the base 10, the reflective member 50, the sealing member 70 and the lens member 80 are the same as those of the light emitting device 1 of the first embodiment. Therefore, these components can be considered to be the same as those described in the light emitting device 1 of the first embodiment.

[0160] In the light emitting devices of the respective modified examples, the description of the respective components of the light emitting element 20 , the base 30 , the relay 40 , and the wiring 60 can be considered to be the same as the description of the respective components in the first embodiment.

[0161] Figure 1 is a perspective view of a light emitting device according to each modified example, Figure 2 1 and 10 are plan views of light emitting devices according to various modifications. In various modifications, the inter-row region, the intra-row region, and the extra-row region have the same definitions as those described in the light emitting device 1 according to the first embodiment.

[0162] and, Figures 6 to 9 The light emitting devices of the respective modifications are those already described in the light emitting device 1 of the first embodiment, and if there is no discrepancy between the light emitting devices of the respective modifications and the drawings, it can be considered that the light emitting devices of the respective modifications are also the same.

[0163] <First Modification>

[0164] Figure 6This is a top view for explaining the state of wiring that electrically connects a plurality of light-emitting elements included in the light-emitting device 1A of the first modification. In the example of the light-emitting device 1A shown in the figure, the first to seventh columns of the second row are first light-emitting elements 20A, the first to third columns, the sixth column, and the seventh column of the first row are second light-emitting elements 20B, and the fourth and fifth columns of the first row are third light-emitting elements 20C. Furthermore, the first light-emitting element 20A emits blue light, the second light-emitting element 20B emits red light, and the third light-emitting element 20C emits green light.

[0165] In the light emitting device 1A, the second light emitting element 20B is arranged on both sides of the third light emitting element 20C so as to sandwich the third light emitting element 20C. Regarding the second light emitting elements 20B arranged on both sides, the peak wavelength of light emitted from the second light emitting element 20B arranged on one side is larger than the peak wavelength of light emitted from the second light emitting element 20B arranged on the other side in the range of 3 nm to 10 nm.

[0166] A plurality of second light emitting elements 20B are arranged on one side, and a plurality of second light emitting elements 20B are arranged on the other side. The peak wavelengths of light emitted from the second light emitting elements 20B arranged on one side are all within a range of less than 3 nm. The peak wavelengths of light emitted from the second light emitting elements 20B arranged on the other side are all within a range of less than 3 nm.

[0167] The plurality of second light emitting elements 20B disposed on one side are disposed in greater number than the plurality of second light emitting elements 20B disposed on the other side, and the peak wavelength of the emitted light is shorter. For example, in the case of using red light emitting elements, since the light emitting elements with a relatively shorter peak wavelength have better relative visibility, by increasing the number of light emitting elements with a relatively shorter peak wavelength, it is possible to make people feel brighter.

[0168] In the state of being mounted on the base 30, the electrode on the upper surface of the first light-emitting element 20A in the light-emitting device 1 is different from the electrode on the upper surface of the first light-emitting element 20A in the light-emitting device 1A. In the light-emitting device 1, the wiring 60 is bonded to the base 30 on which the first light-emitting element 20A located at the end among the plurality of first light-emitting elements 20A arranged in the row direction is placed and the first relay component 40A. In the light-emitting device 1A, the wiring 60 is bonded to the upper surface of the first light-emitting element 20A located at the end among the plurality of first light-emitting elements 20A arranged in the row direction and the relay component 40 (hereinafter referred to as the fourth relay component 40D) arranged outside the inter-row area. In the light-emitting device 1A shown in the figure, the fourth relay component 40D is arranged in the fourth out-of-row area. By arranging the fourth relay component 40D in this way, the wiring 60 can be bonded in a manner that is not located on the optical path of the light reflected by the reflective component 50.

[0169] <Second Modification>

[0170] Figure 7 The light emitting device 1B is a plan view for explaining the state of wiring electrically connecting a plurality of light emitting elements provided in the second modification. The arrangement of the first light emitting element 20A, the second light emitting element 20B, and the third light emitting element 20C and the color of the emitted light are the same as those of the light emitting device 1.

[0171] In the light emitting device 1B, the plurality of first light emitting elements 20A include a first light emitting element 20A having a peak wavelength of emitted light of a first wavelength, a first light emitting element 20A having a peak wavelength of emitted light of a second wavelength, and a first light emitting element 20A having a peak wavelength of emitted light of a third wavelength. Hereinafter, they are referred to as the first light emitting element 20A having a first wavelength, the first light emitting element 20A having a second wavelength, and the first light emitting element 20A having a third wavelength, respectively.

[0172] In the light emitting device 1B, the number of first light emitting elements 20A for the first wavelength is greater than the number of first light emitting elements 20A for the second wavelength. The number of first light emitting elements 20A for the first wavelength is greater than the number of first light emitting elements 20A for the third wavelength.

[0173] The plurality of first light emitting elements 20A of the first wavelength include a first light emitting element 20A disposed between the first light emitting element 20A of the second wavelength and the first light emitting element 20A of the third wavelength. The plurality of first light emitting elements 20A include a first light emitting element 20A of the second wavelength disposed between two first light emitting elements 20A of the first wavelength. The plurality of first light emitting elements 20A include a first light emitting element 20A of the third wavelength disposed between two first light emitting elements 20A of the first wavelength.

[0174] The peak wavelengths of the emitted light of adjacent first light emitting elements 20A are different from each other in the range of 3 nm to 10 nm. The first light emitting elements 20A are arranged so that the same wavelength is not arranged adjacently from the first wavelength, the second wavelength, and the third wavelength.

[0175] In the illustrated light emitting device 1B, the peak wavelength of the emitted light of the first light emitting element 20A of the first wavelength is less than 640 nm. The peak wavelength of the emitted light of the first light emitting element 20A of the third wavelength is greater than 645 nm. Among the plurality of first light emitting elements 20A, the difference in peak wavelength between the first light emitting element 20A with the smallest peak wavelength of emitted light and the first light emitting element 20A with the largest peak wavelength is less than 10 nm. The first light emitting elements 20A of the first wavelength are arranged at both ends and between the two ends of the plurality of first light emitting elements 20A arranged in the row direction. The first light emitting element 20A of the second wavelength and the first light emitting element 20A of the third wavelength are arranged symmetrically with the first light emitting element 20A of the first wavelength arranged between the two ends as a base point.

[0176] The current flow direction of the light emitting device 1B is opposite to that of the light emitting device 1. In the light emitting device 1, the wiring 60 is bonded to the base 30 on which the first light emitting element 20A located at the end is placed among the plurality of first light emitting elements 20A arranged in the row direction and the first relay component 40A. In the light emitting device 1B, the wiring 60 is bonded to the upper surface of the first light emitting element 20A located at the end among the plurality of first light emitting elements 20A arranged in the row direction and the first relay component 40A. The first relay component 40A is arranged between two reflective components 50. The first relay component 40A is arranged in the row region based on the reflective component 50 corresponding to the first light emitting element 20A. In the light emitting device 1B, there is a first light emitting element wiring 60A corresponding to the plurality of first light emitting elements 20A and passing between the adjacent reflective components 50 of the plurality of reflective components 50 arranged in the row direction. By arranging the first relay component 40A in this way, the number of relay components 40 can be suppressed.

[0177] <Third Modification>

[0178] Figure 8 This is a top view for explaining the state of wiring that electrically connects a plurality of light-emitting elements included in a light-emitting device 1C of a third modified example. In the example of the light-emitting device 1C shown in the figure, the first, fourth, and seventh columns of the second row are first light-emitting elements 20A, the first to seventh columns of the first row are second light-emitting elements 20B, and the second, third, fifth, and sixth columns of the second row are third light-emitting elements 20C. Furthermore, the first light-emitting element 20A emits blue light, the second light-emitting element 20B emits red light, and the third light-emitting element 20C emits green light.

[0179] In the light emitting device 1C, one or more second relay components 40B are arranged in the row-out regions on both sides of the column direction with the row-interval region interposed therebetween. The light emitting device 1C has one or more second relay components 40B arranged in the first row-out region or the second row-out region, and one or more second relay components 40B arranged in the third row-out region or the fourth row-out region. The illustrated light emitting device 1C has one or more second relay components 40B arranged in the second row-out region and a plurality of second relay components 40B arranged in the third row-out region.

[0180] The light emitting device 1C includes a plurality of first light emitting elements 20A disposed at both ends in the row direction and disposed between the two ends, and a plurality of third light emitting elements 20C disposed so as to sandwich the first light emitting elements 20A disposed between the two ends. The plurality of third light emitting elements 20C and the other plurality of first light emitting elements 20A are disposed symmetrically with respect to the first light emitting element 20A disposed between the two ends as a base point.

[0181] The relationship between the wavelengths and the arrangement of the plurality of second light emitting elements 20B arranged in the row direction in the illustrated light emitting device 1C is the same as that of the plurality of first light emitting elements 20A in the light emitting device 1 or the plurality of first light emitting elements 20A in the light emitting device 1B. In the light emitting device 1C, the second light emitting elements 20B of the first wavelength, the second light emitting elements 20B of the second wavelength, and the second light emitting elements 20B of the third wavelength are arranged in the same manner as the plurality of first light emitting elements 20A in the light emitting device 1B.

[0182] In the light-emitting device 1C, one or more first light-emitting elements 20A are electrically connected to a first wiring 161 and a second wiring 162, one or more second light-emitting elements 20B are electrically connected to two second wirings 162, and one or more third light-emitting elements 20C are electrically connected to a first wiring 161 and a second wiring 162.

[0183] <Fourth Modification>

[0184] Fig. 9 1 is a top view for explaining the state of wiring that electrically connects a plurality of light-emitting elements included in a light-emitting device 1D according to a fourth variation. In the light-emitting device 1D, a first light-emitting element 20A, a second light-emitting element 20B, and a third light-emitting element 20C are arranged in a row. Furthermore, the first light-emitting element 20A, the second light-emitting element 20B, and the third light-emitting element 20C are arranged in one of two rows. Furthermore, in the first row and the second row, the light-emitting elements 20 that emit light of the same color are arranged in the same column.

[0185] In the example of the light emitting device 1A shown in the figure, the fifth to seventh columns of the first row and the fifth to seventh columns of the second row are first light emitting elements 20A, the third and fourth columns of the first row and the third and fourth columns of the second row are second light emitting elements 20B, and the first and second columns of the first row and the first and second columns of the second row are third light emitting elements 20C. Furthermore, the first light emitting element 20A emits red light, the second light emitting element 20B emits blue light, and the third light emitting element 20C emits green light.

[0186] In the light emitting device 1D, the second relay components 40B are arranged in two rows in the row-outside region. One or more second relay components 40B are arranged in each of the two rows. The light emitting elements 20 that emit light of different colors are electrically connected through the current path of the one or more second relay components 40B arranged in the first row and the current path of the one or more second relay components 40B arranged in the second row.

[0187] In the light emitting device 1D, one or more first relay components 40A are arranged in the inter-row region to electrically connect the first light emitting elements 20A in the first row and the second row. One or more first relay components 40A are arranged in the inter-row region to electrically connect the second light emitting elements 20B in the first row and the second row. One or more first relay components 40A are arranged in the inter-row region to electrically connect the third light emitting elements 20C in the first row and the second row.

[0188] In the light emitting device 1D, the relay component 40 connected to the wiring 60 that is both the first light emitting element wiring 60A and the second light emitting element wiring 60B is not arranged in the first inter-row region. The relay component 40 connected to the wiring 60 that is both the first light emitting element wiring 60A and the third light emitting element wiring 60C is not arranged in the first inter-row region. The relay component 40 connected to the wiring 60 that is both the second light emitting element wiring 60B and the third light emitting element wiring 60C is not arranged in the first inter-row region.

[0189] <Second embodiment>

[0190] Next, a light emitting device 2 according to a second embodiment will be described. Figures 1 to 3 as well as Fig.10 It is a diagram for explaining an exemplary embodiment of the light emitting device 2. Figure 1 It is a perspective view of the light emitting device 2 . Figure 2 is a top view of the light emitting device 2. Figure 3 yes Figure 2 Cross-sectional view at section line III-III. Fig.10It is a plan view for explaining the state of wiring electrically connecting a plurality of light emitting elements included in the light emitting device 2. In the second embodiment, the inter-row area, the intra-row area, and the extra-row area have the same definitions as those explained in the light emitting device 1 of the first embodiment.

[0191] The light emitting device 2 has a plurality of components. The plurality of components include a substrate 10, a plurality of light emitting elements 20, a plurality of bases 30, one or more relay components 40, a plurality of reflective members 50, a plurality of wirings 60, a sealing component 70, and a lens component 80. It should be noted that the light emitting device 2 may also have other components. Furthermore, the light emitting device 2 may not have some of the components listed here.

[0192] In the description of the light emitting device 1 and each component of the first embodiment, Figures 1 to 3 as well as Fig.10 If there is no inconsistency in the comparison of the figures, it can be said that the same is true for the light emitting device 2.

[0193] In the light emitting device 2, the plurality of light emitting elements 20 include one or more first light emitting elements 20A and one or more second light emitting elements 20B. The first light emitting elements 20A and the second light emitting elements 20B are electrically connected so as to be independently drivable.

[0194] The first light emitting element 20A and the second light emitting element 20B emit light of the same color as each other. The first light emitting element 20A and the second light emitting element 20B emit light of a color selected from red light, green light, and blue light. For example, the first light emitting element 20A and the second light emitting element 20B emit blue light.

[0195] For example, by connecting all the light emitting elements 20 arranged in the row direction in series, the total size of the light emitted by each drive can be made to fit within a region closer to a square than when the light emitting elements 20 in different rows are driven individually. There are cases where such a region is preferable when performing optical control.

[0196] Alternatively, the first light emitting element 20A and the second light emitting element 20B may emit light of different colors from each other. The first light emitting element 20A and the second light emitting element 20B emit light of different colors selected from red light, green light, and blue light. For example, the first light emitting element 20A emits blue light, and the second light emitting element 20B emits green light.

[0197] In the example of the light emitting device 2 shown in the figure, the first to fifth columns of the first row and the first to fifth columns of the second row are first light emitting elements 20A, and the sixth and seventh columns of the first row and the sixth and seventh columns of the second row are second light emitting elements 20B. Furthermore, the first light emitting elements 20A emit blue light, and the second light emitting elements 20B emit green light.

[0198] In the plurality of light emitting elements 20 arranged in a matrix, both the first light emitting elements 20A and the second light emitting elements 20B are arranged in the same row of two adjacent rows. In addition, in each of the two adjacent rows, the plurality of first light emitting elements 20A and the plurality of second light emitting elements 20B are arranged in the same row.

[0199] exist Fig.10 In the example of the light emitting device 2 shown, the relays 40 are arranged in the row region based on the reflective members 50 arranged in the first row. Also, the relays 40 are arranged in the row region based on the reflective members 50 arranged in the second row.

[0200] In the light emitting device 2, two first wirings 161 among the plurality of wirings 16 are joined to the first light emitting element wiring 60A, and two second wirings 162 among the plurality of wirings 16 are joined to the second light emitting element wiring 60B. The first light emitting element wiring 60A is not joined to any of the plurality of second wirings 162, and the second light emitting element wiring 60B is not joined to any of the plurality of first wirings 161.

[0201] In a plan view, the first light emitting element 20A and the second light emitting element 20B adjacent to each other in the row direction (in Fig.10 A relay component 40 joined to the first light emitting element wiring 60A and a relay component 40 joined to the second light emitting element wiring 60B are arranged between two imaginary lines parallel to the column direction (the first light emitting element 20A in the fifth column and the second light emitting element 20B in the sixth column).

[0202] Between these two imaginary lines, the relay component 40 joined to the first light emitting element wiring 60A is arranged in the inter-row area, and the relay component 40 joined to the second light emitting element wiring 60B is arranged in the out-row area. In the example of the light emitting device 2 shown in the figure, the relay component 40 joined to the first light emitting element wiring 60A is arranged in the first inter-row area A1, and the relay component 40 joined to the second light emitting element wiring 60B is arranged in the first out-row area and the third out-row area, respectively.

[0203] Except for the third relay component 40C, none of the relay components 40 joined to the first light emitting element wiring 60 is arranged in the area where the first and second row-out regions overlap, and in the area where the third and fourth row-out regions overlap. In the area where the first and second row-out regions overlap, and in the area where the third and fourth row-out regions overlap, one or more relay components 40 joined to the second light emitting element wiring 60, that is, relay components 40 other than the third relay component 40C, are arranged.

[0204] In the first light-emitting element 20A and the second light-emitting element 20B adjacent to each other in the row direction, when the configuration area is divided into two parts using an imaginary line passing through the first light-emitting element 20A and parallel to the column direction, the second light-emitting element wiring 60B and the relay component 40 connected to the second light-emitting element wiring 60B are not configured in the area that does not include the second light-emitting element 20B.

[0205] In the first light-emitting element 20A and the second light-emitting element 20B that are adjacent in the row direction, when the configuration area is divided into two parts using an imaginary line passing through the second light-emitting element 20B and parallel to the column direction, the first light-emitting element wiring 60A and the relay component 40 connected to the first light-emitting element wiring 60A are not arranged in the area that does not include the first light-emitting element 20A.

[0206] <Variations of the Second Embodiment>

[0207] Next, a light emitting device according to a modification of the second embodiment is described. A plurality of modifications are provided below, and the light emitting device according to each modification differs from the arrangement of the plurality of light emitting elements 20 of the light emitting device 2 according to the second embodiment. Therefore, there are cases where the connection method of the wiring 60 and the arrangement of the relay component 40 are different due to the different arrangement of the plurality of light emitting elements 20.

[0208] In the light emitting devices of the modified examples, the base 10, the reflecting member 50, the sealing member 70 and the lens member 80 are the same as those of the light emitting device 2 of the second embodiment. Therefore, these components are the same as those described in the light emitting device 1 of the first embodiment.

[0209] In the light emitting devices of the respective modified examples, the description of the respective components of the light emitting element 20 , the base 30 , the relay 40 , and the wiring 60 can be said to be the same as the description of the respective components in the first embodiment.

[0210] Figure 1 is a perspective view of a light emitting device according to each modified example, Figure 11 and 10 are plan views of light emitting devices according to various modifications. In various modifications, the inter-row region, the intra-row region, and the extra-row region have the same definitions as those described in the light emitting device 1 according to the first embodiment.

[0211] and, Fig.11 and Fig.12 The light emitting devices of the modified examples are the same as those described in the light emitting device 2 of the second embodiment, and the same contents as those of the modified examples are also applicable to the light emitting devices of the modified examples.

[0212] <First Modification>

[0213] Fig.11 This is a top view for explaining the state of wiring electrically connecting a plurality of light emitting elements included in the light emitting device 2A of the first modification. In the example of the light emitting device 2A shown in the figure, the first to fourth columns of the first row and the first to fourth columns of the second row are first light emitting elements 20A, and the fifth to seventh columns of the first row and the fifth to seventh columns of the second row are second light emitting elements 20B.

[0214] As shown in the second embodiment and the first modification, the first light emitting element 20A is arranged on one side and the second light emitting element 20B is arranged on the other side with two adjacent specific columns as the boundary in a plurality of rows. In this case, the specific two columns can be appropriately selected.

[0215] <Second Modification>

[0216] Fig.12 This is a top view for explaining the state of wiring electrically connecting a plurality of light emitting elements included in the light emitting device 2B of the second modification. In the example of the light emitting device 2B shown in the figure, the first to third columns of the first row and the first to fourth columns of the second row are the first light emitting elements 20A, and the fourth to seventh columns of the first row and the fifth to seventh columns of the second row are the second light emitting elements 20B.

[0217] In the light emitting device 2B, only the same number of first light emitting elements 20A and second light emitting elements 20B are respectively provided in two rows and M columns (M is a natural number greater than or equal to 3 and an odd number). In addition, only in the central column (a column of a number obtained by dividing M+1 by 2) among the M columns, the first light emitting element 20A is arranged in one of the two rows, and the second light emitting element 20B is arranged in the other row. In the other columns, either the first light emitting element 20A is arranged in both rows or the second light emitting element 20B is arranged in both rows.

[0218] The relay component 40 connected to the first light emitting element wiring 60A and the relay component 40 connected to the second light emitting element wiring 60B are arranged between the imaginary lines parallel to the column direction passing through the light emitting elements 20 arranged in the columns adjacent to both sides of the central column. The relay component 40 connected to the first light emitting element wiring 60A is arranged in the area between the two imaginary lines in the inter-row area.

[0219] <Third embodiment>

[0220] A light emitting device 3 according to a third embodiment will be described. Figures 13 to 16D It is a diagram for explaining an exemplary embodiment of the light emitting device 3 . Fig.13 It is a schematic diagram of the light emitting element 20 in the light emitting device 3 . Fig.14A and Fig. 14B The diagrams are plan views each showing an example of conventional wiring with respect to the light emitting element 20 . FIG. 15A to FIG. 15F FIG. 2 is a top view showing an example of wiring with respect to the light emitting element 20 in the light emitting device 3. Figures 13 to 15F In FIG. 2 , the waveguide 22 is marked with a dotted line. Fig.16A Yes Fig.14A , Fig. 14B , Fig.15A and Fig. 15B A diagram comparing the temperature characteristics of light output in an example of wiring. Fig. 16B Yes Fig.14A , Fig. 14B , Fig.15A and Fig. 15B This is a diagram comparing the temperature characteristics of the forward voltage in an example of wiring. Fig. 16C Yes Fig. 15B , Fig. 15C and Fig.15D This is a diagram comparing the temperature characteristics of the forward voltage in an example of wiring. Fig.16D Yes Fig.15A , Fig.15E and Fig.15F This is a diagram comparing the temperature characteristics of the forward voltage in an example of wiring.

[0221] It should be noted that Figures 1 to 9 3 is also a diagram for explaining the light emitting device 3. Furthermore, the description of the light emitting device of the first embodiment and each modified example is also considered as the description of the light emitting device 3. However, in the description of the light emitting device of the first embodiment and each modified example, Figures 13 to 16D Any content that conflicts with the drawing of the light-emitting device 3 in the figure and the following description of the light-emitting device 3 does not apply to the description of the light-emitting device 3.

[0222] The light emitting device 3 includes a plurality of components including a base 10 , one or more light emitting elements 20 , one or more bases 30 , one or more relay components 40 , one or more reflecting members 50 , a plurality of wirings 60 , a sealing member 70 , and a lens member 80 .

[0223] It should be noted that the light emitting device 3 may have other components. Furthermore, the light emitting device 3 may not have the same structure as the light emitting device of the first embodiment or each modified example. Furthermore, the invention disclosed by the light emitting device 3 of the second embodiment may not be limited to the application of a light emitting device in which a plurality of light emitting elements arranged in a row are divided into two or more groups that can be driven independently and electrically connected.

[0224] The one or more light-emitting elements 20 provided in the light-emitting device 3 include a light-emitting element 20 having two or more light exit points 21 in the light exit surface. For example, the light-emitting element 20 is a semiconductor laser element. Furthermore, in the light-emitting device 3, the first light-emitting element 20A can be such a light-emitting element 20 having two or more light exit points 21. Hereinafter, for the sake of convenience, the light-emitting device 3 is described with the first light-emitting element 20A as the light-emitting element 20. It should be noted that the second light-emitting element 20B or the third light-emitting element 20C can have two or more light exit points 21 in the light exit surface instead of the first light-emitting element 20A or the same as the first light-emitting element 20A.

[0225] The first light emitting element 20A has two or more waveguides 22 corresponding to different light exit points 21. In the top view, the two or more waveguides 22 extend in directions perpendicular to the light exit surface. It should be noted that the perpendicularity here includes a difference of ±5 degrees. In addition, the waveguide 22 may be arranged in a manner not extending perpendicularly to the light exit surface.

[0226] Fig.13 The light emitting element 20 is shown to have two light emitting points 21 (first light emitting point 21A and second light emitting point 21B). Also shown is the light emitting element 20 having a first waveguide 22A corresponding to the first light emitting point 21A and a second waveguide 22B corresponding to the second light emitting point.

[0227] Fig.14A and Fig. 14B The example shows a conventional scheme in which the wiring 60 is joined to the first light emitting element 20A having two light emitting points 21 and two waveguides 22. As shown in these drawings, the wiring 60 is joined to the upper surface of the first light emitting element 20A intersecting the light emitting surface so that the joining position is directly above each waveguide 22. Furthermore, the wiring 60 is joined to the upper surface of each waveguide 22 in an equal number.

[0228] Such a joining scheme can be considered to be based on the technical idea of ​​joining the wiring 60 as evenly or symmetrically as possible with respect to each waveguide 22 so that the current flows evenly, ensuring that the light output and the electrical load of each waveguide 22 are not biased, thereby allowing the light-emitting element to operate stably.

[0229] On the other hand, depending on the degree of current applied to the first light emitting element 20, it is preferable that the number of wirings 60 connected to the first light emitting element 20A is not one but a plurality of wirings. Fig.14A or Fig. 14B That is, according to such a technical idea, the number of the wirings 60 connected to the first light emitting element 20A is configured to be an integral multiple of the number of the waveguides 22. For example, it is desirable to have two wirings 60 due to the relationship with the applied current, and considering the electrical load on each waveguide 22, it is possible to prepare two wirings 60 for each waveguide 22.

[0230] FIG. 15A to FIG. 15F The example is a scheme for joining the wiring 60 that is not based on such a conventional scheme and its technical concept. The joining state illustrated here can be applied to a light-emitting device 3 in which two or more and five or less wirings 60 are joined to the upper surface of one first light-emitting element 20A. Moreover, it is not limited to this, and it can also be applied to a light-emitting device 3 in which six or more wirings 60 are joined to the upper surface of one first light-emitting element 20A.

[0231] A plurality of wirings 60 are bonded to the upper surface of the first light-emitting element 20A in the light-emitting device 3. The first light-emitting element wiring 60A includes a plurality of wirings 60 bonded to the upper surface of the first light-emitting element 20A. It should be noted that the plurality of wirings 60 bonded to the upper surface of a first light-emitting element 20A described here may refer to wirings 60 bonded to the upper surface of the first light-emitting element 20A at one end and bonded to a common component other than the light-emitting element 20A at the other end. In other words, the plurality of wirings 60 may not include wirings 60 having different components bonded at the other end. For example, among the plurality of wirings 60 bonded to the upper surface of the first light-emitting element 20A, in the case where there are a plurality of wirings 60 bonded to the base 30 at the other end and a wiring 60 bonded to the Zener diode at the other end, the latter may be excluded from the object.

[0232] like FIG. 15A to FIG. 15F As shown in FIG. 1 , the number of wirings 60 bonded to the upper surface of one first light emitting element 20A is two or more. FIG. 15B to FIG. 15DAs shown in FIG. 1 , the number of wirings 60 bonded to the upper surface of one first light emitting element 20A is three or more. Thus, the number of wirings 60 bonded to the upper surface of one first light emitting element 20A may be an even number or an odd number. In other words, a configuration in which an odd number of wirings 60 are bonded to a light emitting element 20 having two waveguides 22 may be adopted.

[0233] In the top view, in the light-emitting device 3, the number of wirings 60 existing in the area overlapping with the first waveguide 22A at the bonding position in the upper surface of the first light-emitting element 20A and the number of wirings 60 existing in the area overlapping with the second waveguide 22B are both 0, or, when at least either side is more than one, their numbers are not the same. Fig.15A , Fig. 15B , Fig.15E and Fig.15F represents an example of the former (all zero), Fig. 15C and Fig.15D The latter example is shown (one or more and not the same number on either side). Note that the joining position refers to the center point of the joining shape of the wiring 60 joined to the upper surface.

[0234] For the plurality of wirings 60 bonded to the upper surface of the first light-emitting element 20A, the positions bonded to the upper surface of the first light-emitting element 20A of the plurality of wirings 60 are located in the region between an imaginary line (hereinafter referred to as the first imaginary line) passing through the point of the first waveguide 22A closest to the second waveguide 22B and perpendicular to the light exit surface and an imaginary line (hereinafter referred to as the second imaginary line) passing through the point of the second waveguide 22B closest to the first waveguide 22A and perpendicular to the light exit surface. It should be noted that the region between the first imaginary line and the second imaginary line does not include the first imaginary line and the second imaginary line. Fig.15A , Fig. 15B , Fig.15E and Fig.15F By setting the bonding position of the wiring 60 in this region, the wiring 60 can be bonded more stably than, for example, bonding the wiring 60 to one end of the upper surface of the first light emitting element 20A.

[0235] For the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A, the bonding positions of the plurality of wirings 60 to the upper surface of the first light emitting element 20A exist only in the region containing the second waveguide 22B in a top view with the first imaginary line as the boundary, or exist only in the region containing the first waveguide 22A in a top view with the second imaginary line as the boundary. It should be noted that even if these regions are determined, the first imaginary line and the second imaginary line are not included. Fig.15D This is an example of the former. Fig. 15C An example of the latter is shown.

[0236] For the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A, when the upper surface of the first light emitting element 20A is divided into two parts with the first imaginary line as the boundary, the number of wirings 60 having bonding positions in a region that does not include the second waveguide 22B in a plan view is zero, and when the upper surface of the first light emitting element 20A is divided into two parts with the second imaginary line as the boundary, the number of wirings 60 having bonding positions in a region that does not include the first waveguide 22A in a plan view is zero. It should be noted that even if these regions are determined, they do not include the first imaginary line and the second imaginary line. Fig.15A , Fig. 15B , Fig.15E and Fig.15F This example is shown.

[0237] For the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A, when the upper surface of the first light emitting element 20A is divided into two parts with the imaginary line (hereinafter referred to as the third imaginary line) as the boundary, the number of wirings 60 having a bonding position in the area on the first waveguide 22A side and the number of wirings 60 having a bonding position in the area on the second waveguide 22B side are not the same when both are 0 or at least one of them exists. It should be noted that even if these areas are determined, the third imaginary line is not included.

[0238] On the upper surface of the first light-emitting element 20A, in a direction perpendicular to the light-emitting surface, the distance between the wiring 60 located closest to the light-emitting surface and the wiring 60 located farthest from the light-emitting surface is greater than the absolute value of the difference between the distance between the light-emitting surface and the wiring 60 located closest to the light-emitting surface and the distance between the surface on the opposite side of the light-emitting surface and the wiring 60 located farthest from the light-emitting surface. FIG. 15A to FIG. 15F In addition to Fig.15E All other numbers are examples.

[0239] In the direction perpendicular to the light emitting surface, the distance between the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A is greater than or equal to 200 μm and less than or equal to 500 μm. The number of the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A is greater than or equal to the length in the direction perpendicular to the light emitting surface of the first light emitting element 20A divided by 500 μm (decimal parts are discarded) and less than or equal to the length in the direction perpendicular to the light emitting surface of the first light emitting element 20A divided by 200 μm (decimal parts are discarded).

[0240] Below, consider FIG. 16A to FIG. 16D It should be noted that FIG. 16A to FIG. 16DIn the experiment, a semiconductor laser element emitting laser light with a peak wavelength of 643 nm was used as the first light emitting element 20A. FIG. 15A to FIG. 15F For each connection state of the wiring 60, five first light emitting elements 20A are prepared for each state, and the average of the five measured values ​​is calculated. FIG. 16A to FIG. 16D The measurement results are plotted in FIG. 1 . The temperature characteristics are measured at 25° C., 45° C., and 60° C. It should be noted that the temperature is obtained by driving the semiconductor laser element in a sealed package and measuring the temperature of the package.

[0241] like Fig.16A As shown in the figure, even if the number of the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A is changed, no significant difference is observed in the temperature characteristics of the light output [W]. Also, no significant difference is found compared to the conventional bonding scheme of the wirings corresponding to the respective waveguides 22. In other words, even if it is not the conventional bonding state, there is no significant influence on the temperature characteristics of the light output Po [W].

[0242] like Fig. 16B As shown in FIG. 1 , there is a tendency that the forward voltage Vf[V] increases as the number of the plurality of wirings 60 bonded to the upper surface of the first light emitting element 20A decreases. On the other hand, the rate of change of Vf with respect to temperature change ( Fig. 16B No significant difference was found in terms of the inclination angle of each line in. By reducing the number of wirings 60, not only can the manufacturing cost be reduced, but also the manufacturing time can be shortened, and productivity can be improved. From the perspective of achieving a balance with the increase in Vf, the number of wirings 60 bonded to the upper surface of the first light-emitting element 20A is preferably three or more and five or less.

[0243] like Fig. 16C As shown, in the top view, when the direction perpendicular to the light emitting surface is the up-down direction, even if the same number of wirings 60 are arranged close to the center, close to the right, or close to the left, no significant difference is found in the comparison of the various arrangements. FIG. 15B to FIG. 15D In the above, the faulty transmitter was checked for deviation by increasing the applied current, and no different tendency or regularity was found between those near the center, those near the right, and those near the left. That is, even if the wiring 60 is arranged closer to either side from the center, it can be considered that there is no large deviation in the current applied to the waveguide 22 near the wiring 60 and the waveguide 22 away.

[0244] like Fig.16D As shown, the same number of wiring lines 60 as shown Fig.15E Compared with that, Fig.15A or Fig.15F That way the Vf is lower. Fig.15E The point where a plurality of wirings 60 are joined at a narrow interval near the light emitting surface is Fig.15A and Fig.15F Different. Multiple wirings 60 are joined at wide intervals near the light emitting surface. Fig.15A and a plurality of wirings 60 are joined at narrow intervals at a position away from the light emitting surface. Fig.15F In comparison, it is conceivable that the relationship of the distance from the light emitting surface, the interval or distance between the plurality of wirings 60 , the distance from the surface on the opposite side to the light emitting surface, and the like can affect the temperature characteristics of Vf.

[0245] It should be noted that, in the illustrated light emitting device 3, a light emitting element 20 having two waveguides 22 is exemplified, but even in a light emitting element 20 having three or more waveguides 22, the connection scheme of the wiring 60 described in the second embodiment can be applied.

[0246] For example, in a top view, on the upper surface of a light-emitting element 20 having two or more waveguides 22, the number of wirings 60 in the area where the joining position overlaps with the waveguide 22 is zero relative to each waveguide 22, or at least one of them is more than one, and their numbers are not the same.

[0247] Furthermore, for example, in a top view, the bonding positions of the plurality of wirings 60 bonded to the upper surface of the light emitting element 20 having two or more waveguides 22 are located in the middle of the region where the upper surface of the light emitting element 20 is divided into three equal parts by an imaginary line parallel to the direction in which the waveguides 22 extend. In addition, when the number of wirings 60 bonded to the regions at both ends is zero or at least one of them is one or more, the numbers are not the same.

[0248] Furthermore, without relying on the conventional bonding scheme, the number of wirings 60 bonded to the upper surface of the light-emitting element 20 having two or more waveguides 22 can be made smaller than the number of waveguides 22 multiplied by 2. It should be noted that the wire diameter (Φ diameter) of the wiring 60 at this time can be greater than 50 μm and less than 100 μm. The larger the wire diameter, the more stable it is and the higher the current that can be applied, so it is greater than 50 μm. Furthermore, in order to prevent the bonding shape of the wiring on the upper surface of the light-emitting element 20 from becoming too large, it is preferably less than 100 μm.

[0249] Furthermore, in the light-emitting element 20 having two or more waveguides 22, the thickness of the electrode joined to the wiring 60 can be greater than 0.1 μm and less than 10 μm. Furthermore, it is preferred that the thickness of the electrode is greater than 0.3 μm and less than 0.5 μm. By sufficiently ensuring the thickness of the electrode, current propagation is facilitated. For example, from the strength relationship of the substrate, it is found that the thickness of the electrode of a semiconductor laser element including a GaAs-based semiconductor is greater than that of a semiconductor laser element including a GaN-based semiconductor. In the case where the light-emitting element 20 having two or more waveguides 22 is a GaAs-based semiconductor laser element, it can be considered that the wiring joining scheme of the present embodiment is suitable.

[0250] The embodiments of the present invention have been described above, and the light-emitting device of the present invention is not strictly limited to the light-emitting devices of the embodiments and various modified examples. That is to say, the present invention is not necessarily limited to the appearance and structure of the light-emitting device disclosed in the embodiments or various modified examples. Moreover, it is not necessary to fully possess all the constituent elements but can be flexibly applied. For example, in the case where the claims do not record a part of the constituent elements of the light-emitting device disclosed in the embodiments, the constituent elements of this part are allowed to be replaced, omitted, deformed in shape, changed in material, etc., and the design freedom of those skilled in the art is determined on this basis to determine the constituent elements applicable to the invention recorded in the claims.

[0251] Industrial Applicability

[0252] The light emitting device described in each embodiment can be used in a projector, a vehicle headlight, a head mounted display, lighting, a display, and the like.

Claims

1. A light emitting device, characterized in that: have: A base body having a mounting surface including a configuration area, a plurality of first wirings arranged at positions away from the configuration area in a first direction, and a plurality of second wirings arranged at positions away from the configuration area in a direction opposite to the first direction; A plurality of light-emitting elements, comprising one or more first light-emitting elements, one or more second light-emitting elements, and one or more third light-emitting elements, arranged in two rows and N columns in the arrangement area, wherein N ≥ 2, and each having a light exit point above the mounting surface, and the first light-emitting element, the second light-emitting element, and the third light-emitting element can be driven independently; One or more relay components, including one or more first relay components, wherein the one or more first relay components are arranged in the arrangement area in an area between rows of the plurality of light emitting elements arranged in two rows and N columns; a plurality of first light emitting element wirings for connecting the one or more first light emitting elements in series to two wirings among the plurality of first wirings and the plurality of second wirings; a plurality of second light emitting element wirings for connecting the one or more second light emitting elements in series to two wirings among the plurality of first wirings and the plurality of second wirings; a plurality of third light emitting element wirings for connecting the one or more third light emitting elements in series to two wirings among the plurality of first wirings and the plurality of second wirings; At least one of the two wirings connecting the one or more first light emitting elements in series is not joined to the second light emitting element wiring and the third light emitting element wiring, At least one of the two wirings connecting the one or more second light emitting elements in series is not joined to the first light emitting element wiring and the third light emitting element wiring, At least one of the two wirings connecting the one or more third light emitting elements in series is not joined to the first light emitting element wiring and the second light emitting element wiring, The plurality of first light emitting element wirings include wirings joined to the first relay member.

2. The light emitting device according to claim 1, wherein: The plurality of first wirings and the plurality of second wirings are respectively constituted by two wirings.

3. The light emitting device according to claim 1, wherein: The first light emitting element, the second light emitting element, and the third light emitting element emit lights of different colors from each other.

4. The light emitting device according to claim 3, wherein: The first light emitting element, the second light emitting element, and the third light emitting element emit light of different colors selected from red light, green light, and blue light.

5. The light emitting device according to claim 1, wherein: One of the plurality of first wirings and the plurality of second wirings is joined to the first light emitting element wiring, the second light emitting element wiring, and the third light emitting element wiring.

6. The light emitting device according to claim 5, wherein: The one or more relay components include a relay component joined to the first light emitting element wiring and the second light emitting element wiring, The plurality of first light emitting element wirings include wirings that also serve as the second light emitting element wirings.

7. The light emitting device according to claim 5, wherein: The one or more first relay components include a relay component joined to the first light emitting element wiring and the third light emitting element wiring, The plurality of first light emitting element wirings include wirings that also serve as the third light emitting element wirings.

8. The light emitting device according to claim 5, wherein: The current path electrically connecting the multiple first light-emitting elements to the two wirings includes a first path electrically connecting only the first light-emitting elements among the first light-emitting elements, the second light-emitting elements, and the third light-emitting elements, a second path electrically connecting only the first light-emitting elements and the third light-emitting elements, and a third path electrically connecting the first light-emitting element, the second light-emitting element, and the third light-emitting element.

9. The light emitting device according to claim 1, wherein: The first light emitting element, the second light emitting element, and the third light emitting element are arranged in a row.

10. The light emitting device according to any one of claims 1 to 9, characterized in that: The first light emitting element is a semiconductor laser element having the following structure, namely: upper surface; a light exit surface having at least two light exit points including a first light exit point and a second light exit point; a first waveguide corresponding to the first light exit point; a second waveguide corresponding to the second light exit point; The plurality of first light emitting element wirings include three or more wirings bonded to the upper surface of the first light emitting element, In the top view, the number of wirings located in the overlapping area with the first waveguide and the number of wirings located in the overlapping area with the second waveguide at the bonding position on the upper surface of the first light-emitting element are both zero or are not the same when at least either one is one or more.

11. The light emitting device according to claim 10, wherein: For the more than three wirings, the bonding position of the first light-emitting element with the upper surface is located in the area between a first imaginary line passing through the point of the first waveguide closest to the second waveguide and perpendicular to the light emitting surface, and a second imaginary line passing through the point of the second waveguide closest to the first waveguide and perpendicular to the light emitting surface.

12. The light emitting device according to claim 10, wherein: The number of the first light emitting element wirings bonded to the upper surface of the first light emitting element is three or more and five or less.

13. A light emitting device, characterized in that: have: A base body having a mounting surface including a configuration area, a plurality of first wirings arranged at positions away from the configuration area in a first direction, and a plurality of second wirings arranged at positions away from the configuration area in a direction opposite to the first direction; A plurality of light-emitting elements, comprising one or more first light-emitting elements and one or more second light-emitting elements, arranged in two rows and N columns in the arrangement area, wherein N ≥ 2, and each having a light emission point above the mounting surface, wherein the first light-emitting element, the second light-emitting element and the third light-emitting element can be driven independently; One or more relay components, including one or more first relay components, wherein the one or more first relay components are arranged in the arrangement area in an area between rows of the plurality of light emitting elements arranged in two rows and N columns; a plurality of first light emitting element wirings for connecting the one or more first light emitting elements in series to two of the first wirings; a plurality of second light emitting element wirings for connecting the one or more second light emitting elements in series to two of the second wirings; Neither of the two first wirings connecting the one or more first light emitting elements in series is joined to the wiring for the second light emitting element. Neither of the two second wirings connecting the one or more second light emitting elements in series is bonded to the wiring for the first light emitting element, The plurality of first light emitting element wirings include wirings joined to the first relay member.

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