Patent Publication Number: US-2022231484-A1

Title: Light emitting device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2021-007966 filed on Jan. 21, 2021, Japanese Patent Application No. 2021-146580 filed on Sep. 9, 2021, and Japanese Patent Application No. 2021-211725 filed on Dec. 24, 2021, the disclosures of which are hereby incorporated by reference in their entireties. 
     BACKGROUND 
     The present invention relates to a light emitting device. 
     Japanese Patent Publication No. 2018-190750 discloses a light emitting device in which a relay member is disposed between a laser element and a lead terminal, and wirings for electrically connecting the laser element to the lead terminal are connected to the relay member to achieve the electrical connection via the relay member. Furthermore, the patent publication discloses an embodiment having a plurality of laser elements disposed in a matrix, in which multiple laser elements in each row are electrically connected in series such that multiple laser elements in units of rows can be independently driven. 
     SUMMARY 
     One object of the present disclosure is to provide a light emitting device in which light emitting elements disposed and electrically connected in a row are divided into two or more independently drivable groups. 
     The light emitting device disclosed by one embodiment includes: a base having a mounting face including a disposition region, the base including: a plurality of first wirings disposed apart from the disposition region in a first direction; and a plurality of second wirings disposed apart from the disposition region in the direction opposite 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, the light emitting elements disposed in two rows and N columns (N≥2) in the disposition region, each having a light emitting point above the mounting face; one or more relay members, including one or more first relay members disposed in a region between the two rows of the light emitting elements in the disposition region; a plurality of first light emitting element wirings for electrically serially connecting the one or more first light emitting elements to two of the plurality of first wirings and the plurality of second wirings; a plurality of second light emitting element wirings for electrically serially connecting the one or more second light emitting elements to two of the plurality of first wirings and the plurality of second wirings; and a plurality of third light emitting element wirings for electrically serially connecting the one or more third light emitting elements to two of the plurality of first wirings and the plurality of second wirings. At least one of the two wirings that electrically serially connect the one or more first light emitting elements is not joined with any of the second light emitting element wirings or the third light emitting element wirings. At least one of the two wirings that electrically serially connect the one or more second light emitting elements is not joined with any of the first light emitting element wirings or the third light emitting element wirings. At least one of the two wirings that electrically serially connect the one or more third light emitting elements is not joined with any of the first light emitting element wirings or the second light emitting element wirings. The plurality of first light emitting element wirings include wirings that are connected to the one or more first relay members. 
     According to the present invention, a light emitting device in which the light emitting elements disposed and electrically connected in a row are divided into two or more independently drivable groups can be provided. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a light emitting device according to several embodiments. 
         FIG. 2  is a top view of the light emitting device according to several embodiments. 
         FIG. 3  is a cross-sectional view of the light emitting device taken along line in  FIG. 2 , in which certain constituent elements are omitted. 
         FIG. 4  is a top view illustrating wirings of the light emitting device according to a First Embodiment. 
         FIG. 5  is a top view illustrating examples of the configurations of inter-row regions, intra-row regions, and outside-of-row regions in the light emitting device according to several embodiments. 
         FIG. 6  is a top view illustrating wirings of a light emitting device according to a First Variation of the First Embodiment. 
         FIG. 7  is a top view illustrating wirings of a light emitting device according to a Second Variation of the First Embodiment. 
         FIG. 8  is a top view illustrating wirings of a light emitting device according to a Third Variation of the First Embodiment. 
         FIG. 9  is a top view illustrating wirings of a light emitting device according to a Fourth Variation of the First Embodiment. 
         FIG. 10  is a top view illustrating wirings of a light emitting device according to a Second Embodiment. 
         FIG. 11  is a top view illustrating wirings of a light emitting device according to a First Variation of the Second Embodiment. 
         FIG. 12  is a top view illustrating wirings of a light emitting device according to a Second Variation of the Second Embodiment. 
         FIG. 13  is a schematic view of a light emitting device according to a Third Embodiment. 
         FIG. 14A  is a top view illustrating an example of conventional wirings with respect to a light emitting element according to the Third Embodiment. 
         FIG. 14B  is a top view illustrating another example of the conventional wirings with respect to the light emitting element according to the Third Embodiment. 
         FIG. 15A  is a top view illustrating example wirings with respect to a light emitting element of a light emitting device according to the Third Embodiment. 
         FIG. 15B  is a top view illustrating other example wirings with respect to a light emitting element of a light emitting device according to the Third Embodiment. 
         FIG. 15C  is a top view illustrating other example wirings with respect to a light emitting element of a light emitting device according to the Third Embodiment. 
         FIG. 15D  is a top view illustrating other example wirings with respect to a light emitting element of a light emitting device according to the Third Embodiment. 
         FIG. 15E  is a top view illustrating other example wirings with respect to a light emitting element of a light emitting device according to the Third Embodiment. 
         FIG. 15F  is a top view illustrating other example wirings with respect to a light emitting element of a light emitting device according to the Third Embodiment. 
         FIG. 16A  is a graph showing a comparison of temperature characteristics of the optical outputs between the example wirings in  FIG. 14A ,  FIG. 14B ,  FIG. 15A , and  FIG. 15B . 
         FIG. 16B  is a graph showing a comparison of temperature characteristics of the forward voltages between the example wirings in  FIG. 14A ,  FIG. 14B ,  FIG. 15A , and  FIG. 15B . 
         FIG. 16C  is a graph showing a comparison of the temperature characteristics of the forward voltages between the example wirings in  FIG. 15B ,  FIG. 15C , and FIG,  15 D. 
         FIG. 16D  is a graph showing a comparison of the temperature characteristics of the forward voltages between the example wirings in  FIG. 15A ,  FIG. 15E , and  FIG. 15F . 
     
    
    
     DETAILED DESCRIPTION 
     In the description and the accompanying claims, a polygon, such as a triangle, rectangle, or the like, including a shape subjected to processing of a corner of the polygon, such as cutting angles, beveling, chamfering, rounding, or the like, will be referred to as a “polygon.” Moreover, the location of such processing is not limited to a corner (an end of a side). Rather, a shape subjected to processing in the intermediate portion of a side will similarly be referred to as a polygon. In other words, any polygon-based shape subjected to processing should be understood to be included in the interpretation of a “polygon” in the description and accompanying claims. 
     This similarly applies to any word describing a specific shape, such as a trapezoidal, circular, recessed, or projected shape, without being limited to a polygon. This also similarly applies to the sides defining such shapes. In other words, even if a corner or intermediate portion of a side is subjected to processing, the term “side” should be interpreted to include the processed portion. To distinguish a “polygon” or “side” that is intentionally not processed from a shape subjected to processing, the shape will be described by adding the phrase “exact,” such as “an exact rectangle.” 
     In the description or the accompanying claims, expressions such as up/down, left/right, front/back, forward/rearward, forepart/rear part, or the like merely describe the relative positions, orientations, or directions, and do not have to be matched by those in use. 
     In the accompanying drawings, directions, such as X, Y, and Z directions, might be indicated by using arrows. The directions indicated by the arrows are consistent among the drawings that are related to the same embodiment. 
     In the present specification, moreover, when explaining a constituent element, for example, the term such as “member” or “part/portion” may be used. A “member” refers to a subject physically handled by itself. A subject physically handled by itself is also considered as a component in a manufacturing process. On the other hand, a “part/portion” refers to a subject that does not have to be physically handled by itself. For example, the word “part/portion” is used to describe a portion of a member. 
     Describing something while making a distinction between the “member” and the “part/portion” described above is not meant to show the intent of consciously limiting the scope of the right under the doctrine of equivalents. In other words, even if there is a constituent element described as a “member” in the scope of claims, this alone does not constitute the recognition of the applicant that physically handling the constituent element by itself is essential in applying the present invention. 
     In the description or the accompanying claims, moreover, when there are multiple units of a certain element and a distinction must be made, a word such as “first,” “second,” or the like might occasionally be added. The subject to be distinguished can differ between the description and the scope of claims. Accordingly, even if a constituent element accompanied by the same word as that in the description is present in the claims, the subject identified by the constituent element might not match between the description and the claims. 
     For example, in the case in which there are a plurality of elements denoted and distinguished by “first,” “second,” and “third” in the description, and a certain claim recites only those that are referred to as the “first” and “third” in the description, the elements might be distinguished by adding the “first” and “second” in the claim for comprehensible purpose. In this case, the elements accompanied by the words “first” and “second” in the claim refer to the elements accompanied by the words “first” and “third” in the description. This rule applies not only to constituent elements, but also other subjects in a reasonable and flexible manner. 
     Certain embodiments of the present invention will be explained below. Moreover, specific embodiments implementing the present invention will be explained with reference to the drawings. The present invention is not limited to the specific embodiments. In other words, the embodiments illustrated are not the only embodiments in which the present invention can be realized. The sizes and relative positions of the members shown in the drawings might be exaggerated for clarity of explanation. 
     First Embodiment 
     A light emitting device  1  according to a First Embodiment will be explained.  FIG. 1  to  FIG. 5  are drawings illustrating one embodiment of the light emitting device  1  provided for exemplification purposes.  FIG. 1  is a perspective view of the light emitting device  1 .  FIG. 2  is a top view of the light emitting device  1 .  FIG. 3  is a cross-sectional view taken along line in  FIG. 2 . In  FIG. 3 , the constituent elements disposed on the base part  12  are omitted so as not to make the drawing excessively complex.  FIG. 4  is a top view illustrating the wiring for electrically connecting the light emitting elements in the light emitting device  1 .  FIG. 5  is a top view showing examples of the definitions of the inter-row regions, the intra-row regions, and the outside-of-row regions discussed later for the light emitting device  1 . 
     The light emitting device  1  includes a plurality of constituent elements. The constituent elements include a base  10 , a plurality of light emitting elements  20 , a plurality of submounts  30 , one or more relay members  40 , a plurality of reflective members  50 , a plurality of wirings  60 , a sealing member  70 , and a lens member  80 . 
     The light emitting device  1  may include other elements besides those described above. For example, the light emitting device  1  may include additional light emitting elements besides the light emitting elements  20 . Furthermore, the light emitting device  1  does not have to include a certain element among those listed here. 
     Each constituent element of the light emitting device  1  will be explained. 
     Base  10   
     A base  10  has a base part  12  and a wall part  14 . The base part  12  has a mounting face on which other constituent elements are mounted. The wall part  14  surrounds the mounting face. The mounting face is the upper face of the base part  12 , and the wall part  14  constitutes a lateral wall extending higher above the mounting face. 
     The base part  12  has a projected portion  12   a . In other words, the base part  12  has a first face, a second face located at a higher level than the first face, and one or more lateral faces that link the first face and the second face. The second face can serve as the mounting face. The lateral wall can be formed outward of the second face. In other words, the wall part  14  can be formed to surround the entire second face. 
     In the base part  12 , the shape of the region surrounded by the wall part  14  is rectangular. The long sides of the rectangular shape can be set to fall within the 15 mm to 35 mm range, and the short sides to fall within the 10 mm to 25 mm range. The long sides can be 1.4 to 2.5 times the short sides. In the example of the base  10  illustrated in the drawings, the long sides are in parallel with the X direction, and the short sides are in parallel with the Y direction. 
     In a top view, the mounting face is rectangular. The long sides of the rectangular shape are in parallel with the long sides of the region surrounded by the wall part  14 , and the short sides of the rectangular shape are in parallel with the short sides of the region surrounded by the wall part  14 . The long sides of the rectangular shape can be 0.75 to 1 times the long sides of the region surrounded by the wall part  14 , and the short sides of the rectangular shape can be 0.7 to 1 times the short sides of the region surrounded by the wall part  14 . 
     The base part  12  and the wall part  14  can be formed of different materials. For example, the base part  12  can be formed of a base material formed by using any of copper, copper tungstate, copper molybdenum, steel, and iron as a primary material, and the wall part  14  can be formed of a wall material formed by using steel or iron as a primary material. Specific examples include a base  10  formed by bonding a base material formed of oxygen-free copper as a primary material, and a wall material formed of mild steel having a carbon content in the 0.12% to 0.30% range as a primary material. 
     A primary material is one having the largest percentage by mass or volume in a formed object. If a formed object is formed of one material, that material is the primary material. In other words, a certain material being a primary material can include the instance in which the percentage of the material in an object is 100%. 
     In the case in which the base part  12  and the wall part  14  are formed of different materials as described above, the shape of the base part  12  that includes a projected portion  12   a  can suppress the mounting face from warping. The shape of the base  10  is not limited to this, and it may have, for example, a sheet shape. A sheet shaped base  10  does not have a wall part  14 . 
     The base  10  further includes a plurality of wirings  16 . The wirings  16  include a first wiring  161  and a second wiring  162  that oppose one another across the mounting face. The wirings  16  include a plurality of first wirings  161 . The wirings  16  include a plurality of second wirings  162 . The wirings  16  include as many second wirings  162  as the first wirings  161 . 
     Each wiring  16  has an inner wiring portion located inward of the lateral wall, and an external wiring portion located outward of the lateral wall. The inner wiring portion and the outer wiring portion of a wiring  16  are electrically continuous. For example, the wirings  16  pass through the wall part  14 . 
     The wirings  16  can be lead pins that pass through the wall part  14 . The wirings  16  can alternatively be formed of, for example, a metal film disposed on the upper face of the base  10 . The wirings  16  can be formed by using a metal, such as, kovar, copper, or iron as a primary material. 
     Light Emitting Element  20   
     A light emitting element  20  emits light. The light emitting element  20  has an upper face, a lower face, and one or more lateral faces among which one or more faces are the light emitting face(s) through which light exits. The light emitting element  20  emits light from one or more points of the light emitting face(s). The points will be referred to as light emitting points. A specific example of a light emitting element  20  is a semiconductor laser element. 
     For the light emitting element  20 , for example, a blue light emitting element, a green light emitting element, or a red light emitting element can be employed. A light emitting element emitting light of another color besides these can be employed for the light emitting element  20 . 
     Here, blue light refers to the light having a peak emission wavelength falling within the 420 nm to 494 nm range. Green light refers to the light having a peak emission wavelength falling within the 495 nm to 570 nm range. Red light refers to the light having a peak emission wavelength falling within the 605 nm to 750 nm range. 
     A semiconductor laser element will now be explained. A semiconductor laser element has a rectangular outline having opposite long sides and opposite short sides in the top view. A semiconductor laser element is formed by stacking multiple semiconductor layers including an active layer in the direction from the lower face to the upper face. A lateral face including one of the two short sides of the rectangle is the emission end face through which light exits. The emission end face of a semiconductor laser element can be said as the light emitting face of a light emitting element  20 . The upper face and the lower face of a semiconductor laser element have larger areas than the emission end face. 
     The light (laser beam) emitted from a semiconductor laser element spreads. The divergent light exits the emission end face of the semiconductor laser element. The light emitted from a semiconductor laser element forms an elliptical far field pattern (hereinafter referred to as “FFP”) in a plane parallel with the emission end face. Here, FFP refers to the shape and light intensity distribution of the emitted light at a location distant from the emission end face. 
     Here, the light passing the center of the elliptical FFP, in other words, the light having the peak intensity in the light intensity distribution of the FFP will be referred to as the light advancing or passing along the optical axis. Moreover, the light having an intensity of at least 1/e 2  relative to the peak intensity value based on the light intensity distribution of an FFP will be referred to as the main portion of the emitted light. 
     The shape of the FFP of the emitted light from a semiconductor laser element is an ellipse that is longer in the stacking direction than in the direction perpendicular to the stacking direction. The stacking direction refers to the direction in which a plurality of semiconductor layers including an active layer are stacked in a semiconductor laser element. The direction perpendicular to the stacking direction can also be referred to as the direction along a semiconductor layer plane. The long diameter direction of the elliptical shape of the FFP can also be referred to as the fast axis direction of the semiconductor laser element, and the short diameter direction the slow axis of the semiconductor laser element. 
     The light emitted from a semiconductor laser element is divergent light. Here, the angle at which the light having an intensity of 1/e 2  of the peak intensity based on the light intensity distribution of the FFP spreads will be referred to as the beam spread angle of the semiconductor laser element. Besides the 1/e 2  intensity of the peak light intensity, the beam spread angle is occasionally obtained from the light intensity that is one half of the peak light intensity, for example. In the present specification, when simply referred to as a “beam spread angle,” it refers to the beam spread angle at the 1/e 2  intensity of the peak light intensity. It can be said that the spread angle in the fast axis direction is larger than the spread angle in the slow axis direction. 
     Examples of a blue or green light emitting semiconductor laser element include a semiconductor laser element that includes a nitride semiconductor. For the nitride semiconductors, for example, GaN, InGaN, or AlGaN can be used. Examples of a red light emitting laser element include those that include an InAlGaP-based, GaInP-based, GaAs-based, or AlGaAs-based semiconductor. 
     Submount  30   
     A submount  30  has a lower face, an upper face, and one or more lateral faces. The width of the submount  30  is smallest in the up/side direction. The submount  30  has a rectangular cuboid shape. The shape is not limited to a rectangular cuboid. The submount  30  can be formed by using, for example, aluminum nitride, silicon nitride, or silicon carbide as a primary material. 
     Relay Member  40   
     A relay member  40  has a lower face, an upper face, and one or more lateral faces. The width of the relay member  40  is smallest in the up/down direction. The relay member  40  has a rectangular cuboid shape. The shape is not limited to a rectangular cuboid. The relay member  40  can be formed by using, for example, silicon nitride, aluminum nitride, silicon carbide, or aluminum oxide as a primary material. 
     Reflective Member  50   
     A reflective member  50  has a light reflecting face that reflects light. The reflective member  50  has a lower face and an upper face, and the light reflecting face is oblique to the lower face of the reflective member  50 . In other words, the light reflecting face is not orthogonal to or in parallel with the lower face of the reflective member  50 . The light reflecting face is a flat face, and forms an oblique angle of 45 degrees with the lower face of the reflective member  50 . The light reflecting face does not have to be a flat face or have a 45 degree oblique angle. 
     The reflective member  50  can be formed by using glass or a metal as a primary material. A heat resistant material is suited for the primary material, and for example, glass such as quartz or BK7 (borosilicate glass), a metal such as aluminum can be used. The reflective member  50  can alternatively be formed by using Si as a primary material. In the case in which the primary material is a reflective material, the light reflecting face can be formed of the primary material. In the case of forming a light reflecting face by using a material different from the primary material, the light reflecting face can be formed by forming, for example, a metal film such as Ag or Al, or a multilayer dielectric film, such as Ta 2 O 5 /SiO 2 , TiO 2 /SiO 2 , Nb 2 O 5 /SiO 2 , or the like. 
     The light reflecting face has a reflectance of at least 90% with respect to the peak wavelength of the light irradiated on the light reflecting face. The reflectance may be at least 95%. The reflectance here is 100% at most or lower than 100%. 
     Wiring  60   
     A wiring  60  is a linear conductor having joint portions at both ends. In other words, a wiring  60  has joint portions to be joined with other constituent elements at both ends of the linear portion. A wiring  60  is used for electrically connecting two elements. For the wiring  60 , for example, a wire formed of a metal as a primary material can be used. Examples of metals include gold, aluminum, silver, and copper. 
     Sealing Member  70   
     A sealing member  70  has an upper face and a lower face. The sealing member  70  has a light transmitting portion having high transmissivity through the member from the upper face to the lower face. Having high transmissivity means that the light transmittance is at least 80%. It does not have to have a light transmittance of at least 80% with respect to light of all wavelengths. 
     The sealing member  70  may be formed of a frame member with one or more openings, and one or more light transmitting members that plug the one or more openings. In this case, the frame member does not have to have high transmissivity. The light transmitting member(s) include a light transmitting portion. 
     The light transmitting portion in the sealing member  70  can be formed by using a light transmissive material, such as glass, sapphire, or quartz as a primary material. As a primary material for the frame member, for example, a metal can be used. 
     Lens Member  80   
     A lens member  80  has an upper face, a lower face, lateral faces, and a plurality of lens faces. The lens faces are provided on the upper face side. The lens faces are disposed in a matrix, 2 rows×N columns (N is 2 or higher natural number). The lens faces may be disposed on the lower face side. 
     The upper face and the lower face are flat faces. The lens faces meet the upper face. The lens faces are surrounded by the upper face in the top view. In the top view, the outline of the lens member  80  is rectangular. The lower face of the lens member  80  is rectangular. 
     Here, in the lens member  80 , the portion that overlaps the lens faces in the top view will be referred to as the lens portion. In the lens member  80 , the portion that overlaps the upper face in the top view will be referred to as the non-lens portion. When the lens portion is halved by an imaginary plane that includes the upper face, the lens face side will be referred to as the lens shaped portion, and the lower face side will be referred to as the sheet shaped portion. The lower face of the lens portion is a part of the lower face of the lens member  80 . 
     The lens member  80  has high transmissivity. The lens portion is formed to have high transmissivity in whole. The lens member  80  can be formed by using a light transmissive material, such as glass or synthetic quartz, as a primary material. 
     Light Emitting Device  1   
     A light emitting device  1  that includes the constituent elements described above will be explained next. 
     In a light emitting device  1 , a plurality of light emitting elements  20  are disposed on the base  10 . The light emitting elements  20  are disposed on the mounting face of the base  10 . The light emitting points of the light emitting elements  20  are all positioned above the mounting face. The light emitting elements  20  are disposed in the disposition region of the mounting face. It can be considered that the disposition region is a region within the mounting face that can surround the light emitting elements  20  disposed on the mounting face. 
     The light emitting elements  20  are disposed in a matrix. The light emitting elements  20  are disposed in two rows and N columns (N is 2 or higher natural number). The light emitting points of the N light emitting elements  20  in the same row can be disposed at equal intervals in the row direction. The light emitting device  1  may have more light emitting elements such that they are disposed in a matrix having three or more rows as a whole. Similarly, more light emitting elements may be disposed such that the number of columns is greater than N. 
     The spacing between adjacent light emitting elements  20  in the row direction is 1.2 mm to 4 mm. The spacing between adjacent light emitting elements  20  in the row direction is smaller than the spacing between adjacent light emitting elements  20  in the column direction. The spacing between adjacent light emitting elements  20  in the column direction is 4 mm to 8 mm. 
     In the case of the light emitting device  1  illustrated in the drawings, the row direction in the matrix is in parallel with the X direction and the column direction is in parallel with the Y direction. For the light emitting elements  20 , semiconductor laser elements are employed. Furthermore, the light emitting elements  20  are disposed in two rows and seven columns. The light emitting elements  20  are preferably disposed in 3 or more columns. This allows the long/short orientation of the disposition region to correspond to the long/short orientation of the mounting face, thereby facilitating the disposition of the light emitting elements in an efficient manner. 
     Using the disposition region as a reference point, the first wirings  161  and the second wirings  162  are disposed apart from the disposition region in the opposite directions. The first wirings  161  are positioned distant from the disposition region in a first direction, and the second wirings  162  are positioned distant from the disposition region in the direction opposite the first direction. 
     In the case of the light emitting device  1  illustrated in the drawings, the first direction and the direction opposite the first direction parallel the X direction. As many first and second wirings  161  and  162  as the number of rows of the light emitting elements  20  disposed in a matrix are provided. In other words, the first wirings  161  and the second wirings  162  are formed of two wirings  16  each. 
     The light emitting elements  20  include one or more first light emitting elements  20 A, one or more second light emitting elements  20 B, and one or more third light emitting elements  20 C. The first light emitting element(s)  20 A, the second light emitting element(s)  20 B, and the third light emitting element(s)  20 C are electrically connected so as to be independently driven. How they are connected will be described in detail later. 
     The first light emitting element(s)  20 A, the second light emitting element(s)  20 B, and the third light emitting element(s)  20 C emit light of different colors. The first light emitting element(s)  20 A, the second light emitting element(s)  20 B, and the third light emitting element(s)  20 C emit light of different colors from one another selected from red light, green light, and blue light. 
     A plurality of first light emitting elements  20 A emit light of the same color. The differences among the peak wavelengths of the light emitted by the first light emitting elements  20 A are 30 nm at most. The same is true for the second light emitting elements  20 B and the third light emitting elements  20 C. 
     The first light emitting elements  20 A can include two or more first light emitting elements  20 A among which the peak wavelengths of the light emitted differ from 3 nm to 10 nm from one another. Such a peak wavelength difference is preferably 3 nm to 5 nm. For example, in the case of using laser light emitted from a light emitting device  1  in displaying an image, allowing the elements to emit light of the same color but different wavelengths can reduce the speckle noise. The second light emitting elements  20 B and the third light emitting elements  20 C can similarly be constructed to emit light of different peak wavelengths. 
     In the case of the light emitting device  1  illustrated in the drawings, the light emitting elements disposed in the second row from the first to the seventh columns are the first light emitting elements  20 A, those disposed in the first row in the first, the second, the sixth, and the seventh columns are the second light emitting elements  20 B, and those disposed in the first row from the third to the fifth columns are the third light emitting elements  20 C. The first light emitting elements  20 A emit red light, the second light emitting elements  20 B emit green light, and the third light emitting elements  20 C emit blue light. 
     In the case of the light emitting device  1  illustrated in the drawings, the first light emitting elements  20 A include a first light emitting element  20 A emitting light of a peak wavelength that is a first wavelength, and a first light emitting element  20 A emitting light of a peak wavelength that is a second wavelength higher than the first wavelength. The second wavelength is higher than the first wavelength by 3 nm to 10 nm. The first light emitting elements  20 A further include a first light emitting element  20 A emitting light of a peak wavelength that is a third wavelength higher than the second wavelength. The third wavelength is higher than the second wavelength by 3 nm to 10 nm. 
     Preferably, the third wavelength is higher than the first wavelength by 3 nm to 10 nm. Furthermore, the second wavelength is higher than the first wavelength by 3 nm to 5 nm, and the third wavelength is higher than the second wavelength by 3 nm to 5 nm. By controlling the difference between the maximum and the minimum peak wavelengths of the light emitted by the light emitting elements that emit the same color light to 10 nm at most, light without a considerable variation in hue can be output. 
     The light emitting elements  20  are disposed such that their light emitting faces all face in a lateral direction. The light emitting elements  20  are disposed such that the light emitting faces face in the same direction. Here, the same direction in the top view includes a tolerance of ±5 degrees formed by the light emitting faces with the direction. In the case of the light emitting device  1  illustrated in the drawings, the light emitting faces of the light emitting elements  20  are in parallel with the X direction and orthogonal to the Y direction. The optical axis of the light emitted by each of the light emitting elements  20  is in parallel with the Y direction. 
     Each light emitting element  20  is disposed on a submount  30 . Each light emitting element  20  is disposed on the mounting face via a submount  30 . A plurality of light emitting elements  20  are disposed on a plurality of submounts  30 . The submounts  30  are provided for the light emitting elements  20  on a one-to-one basis. 
     The submounts  30  include the submounts  30  of two or more different sizes in the top view. In the case of the light emitting device  1  illustrated in the drawings, among the two differently sized submounts  30 , the first light emitting elements  20  are bonded to the submounts  30  having a larger area. This can increase the heat dissipation performance with respect to the first light emitting elements  20 A. 
     A plurality of reflective members  50  are disposed on the substrate  10 . The reflective members  50  are disposed on the mounting face of the base  10 . The reflective members  50  are disposed in the disposition region of the mounting face. It can be considered that the disposition region is a region within the mounting face which can surround the reflective members  50  and the light emitting elements  20  disposed on the mounting face. 
     The reflective members  50  reflect the light emitted by the light emitting elements  20 . The light reflected by each reflective member  50  advances upwards. The light reflecting face of each reflective member  50  is oblique at a 45 degree angle to the direction of the light advancing along the optical axis. The light advancing along the optical axis is reflected by a light reflective member  50  to advance in the direction orthogonal to the mounting face. This direction is in parallel with the Z direction. 
     The main portions of the light from the light emitting elements  20  are reflected by the reflective members  50 . Hereinafter, the reflective member  50  that reflects the main portion of the light from a light emitting element  20  might occasionally be referred to as the reflective member  50  corresponding to the light emitting element  20 . 
     The reflective members  50  include one or more reflective members  50  corresponding to one or more first light emitting elements  20 A, one or more reflective members  50  corresponding to one or more second light emitting elements  20 B, and one or more reflective members  50  corresponding to one or more third light emitting elements  20 C. 
     The reflective members  50  are provided for the light emitting elements  20  on a one-to-one basis. The reflective members  50  are disposed in a matrix. The light reflective members  50  are disposed in two rows and N columns (N is 2 or higher natural number). The N reflective members  50  disposed in a row can be positioned at equal intervals. The reflective members  50  may include a reflective member  50  that corresponds to multiple light emitting elements  20  consecutively disposed. 
     For example, the reflective members  50  may include a reflective member  50  that corresponds to multiple consecutively disposed first light emitting elements  20 A, a reflective member  50  that corresponds to multiple consecutively disposed second light emitting elements  20 B, and a reflective member  50  that corresponds to multiple consecutively disposed third light emitting elements  20 C. 
     The light reflecting face of each reflective member  50  reflects at least 90% of the main portion of the irradiated light. The light emitting device  1  does not have to have the light reflective members  50 . In this case, for example, the emission end faces of the light emitting elements  20  face up. 
     One or more relay members  40  are disposed on the base  10 . The one or more relay members  40  are disposed on the mounting face. The one or more relay members  40  include one or more first relay members  40 A disposed in the inter-row region between the light emitting elements  20  that are disposed in two rows and N columns. 
     An inter-row region is a region between the rows of constituent elements disposed in two rows and N columns, i.e., the region between the elements in the first row and the elements in the second row. Accordingly, an inter-row region between the light emitting elements  20  disposed in two rows, an inter-row region between the reflective members  50  disposed in two rows, an inter-row region between the light emitting elements in the first row and the reflective members  50  in the second row, and an inter-row region between the reflective members  50  in the first row and the light emitting elements  20  in the second row can be defined, which hereinafter will be 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. 
     An inter-row region is a region interposed between two imaginary lines parallel with the row direction in the top view. One of the two imaginary lines is the imaginary line passing through the elements in the first row at the closest positions to the elements in the second row, and the other is the imaginary line passing through the elements in the second row at the closest positions to the elements in the first row. In  FIG. 5 , the first inter-row region A 1  as an example of the inter-row regions is marked with hatching. 
     One or more first relay members  40 A are disposed in the region in which the first inter-row region, the second inter-row region, the third inter-row region, and the fourth inter-row region overlap. The one or more first relay members  40 A can be disposed in either the third inter-row region or the fourth inter-row region, whichever one in which the light emitting elements  20  and reflective members  50  are absent. 
     The one or more relay members  40  include one or more second relay members  40 B that are disposed in the outside-of-row region of the light emitting elements  20  disposed in two rows and N columns. An outside-of-row region is a region defined by an imaginary line used as a border parallel with the row direction and passing through positions of certain constituent elements disposed in multiple columns in one of the two rows, the positions farthest from the other row, where the outside-of-row region is the region that does not include the constituent elements. 
     Accordingly, an outside-of-row region based on the light emitting elements  20  disposed in the first row, an outside-of-row region based on the reflective members  50  disposed in the first row, an outside-of-row region based on the light emitting elements  20  disposed in the second row, and an outside-of-row region based on the reflective members  50  disposed in the second row can be defined, which hereinafter will be referred to as the first outside-of-row region, the second outside-of-row region, the third outside-of-row region, and the fourth outside-of-row region, respectively. In  FIG. 5 , as an example of the outside-of-row regions, the first outside-of-row region A 3  is marked with hatching. 
     The one or more relay members  40  include one or more third relay members  40 C each being joined with one end of a wiring  60  that is connected to a wiring  16  at the other end. A third relay member  40 C is disposed at a position distant from the light emitting element  20  positioned at one end of a row of light emitting elements  20  in the direction opposite the direction in which the adjacent light emitting element  20  is disposed. In contrast to the third relay member  40 C, the first relay member  40 A and the second relay member  40 B can be relay members to which the wirings  60  not connected to the wiring  16  at either end are respectively connected. 
     In addition to the inter-row regions and the outside-of-row regions, an intra-row region can be defined. An intra-row region is a region interposed between the inter-row region and the outside-of-row region specified based on certain constituent elements disposed in the same row and multiple columns. In  FIG. 5 , as an example of such an intra-row region, the intra-row region A 2  based on the light emitting elements  20  disposed in the first row is marked with hatching. This intra-row region A 2  is the region interposed between the first inter-row region A 1  and the first outside-of-row region A 3 . 
     In the case of the light emitting device  1  illustrated in  FIG. 4 , the form in which a relay member  40  is disposed in the intra-row region based on the light emitting elements  20  disposed in the first row is shown. It also shows the form in which relay members  40  are disposed in the intra-row region based on the reflective members  50  disposed in the first row. 
     The wirings  60  are disposed to electrically connect the light emitting elements  20  to the wirings  16 . The wirings  60  include a plurality of first light emitting element wirings  60 A that electrically serially connect the one or more first light emitting elements  20 A to two wirings  16  among the first wirings  161  and the second wirings  162 . 
     The wirings  60  include a plurality of second light emitting element wirings  60 B that electrically serially connect the one or more second light emitting elements  20 B to two wirings  16  among the first wirings  161  and the second wirings  162 . 
     The wirings  60  include a plurality of third light emitting element wirings  60 C that electrically serially connect the one or more third light emitting elements  20 C to two wirings  16  among the first wirings  161  and the second wirings  162 . 
     A first light emitting element wiring  60 A is joined with each of the two wirings  16  that electrically serially connect the one or more first light emitting elements  20 A. Neither a second light emitting element wiring  60 B nor a third light emitting element wiring  60 C is joined with at least one of these two wirings  16 . 
     A second light emitting element wiring  60 B is joined with each of the two wirings  16  that electrically serially connect the one or more second light emitting elements  20 B. Neither a first light emitting element wiring  60 A nor a third light emitting element wiring  60 C is joined with at least one of these two wirings  16 . 
     A third light emitting element wiring  60 C is joined with each of the two wirings  16  that electrically serially connect the one or more third light emitting elements  20 C. Neither a first light emitting element wiring  60 A nor a second light emitting element wiring  60 B is joined with at least one of these two wirings  16 . 
     The wirings  16  include a wiring  16  with which a first light emitting element wiring  60 A, a second light emitting element wiring  60 B, and a third light emitting element wiring  60 C are joined. This wiring  16  is one of the first wirings  161  and the second wirings  162 . 
     The first light emitting element wirings  60 A include a wiring  60  that is joined with a first relay member  40 A. This first relay member  40 A may be a first relay member  40 A based on any of the first to fourth inter-row regions. The first light emitting element wirings  60 A include wirings  60  joined with one or more first relay members  40 A, and wirings  60  joined with one or more first light emitting elements  20  or one or more submounts  30  on which the one or more first light emitting elements  20 A are mounted. 
     The one or more first light emitting elements  20 A are electrically connected to the two first wirings  161 . The first light emitting element wirings  60 A are joined with the one or more first relay members  40 A positioned on the opposite side of the one or more first light emitting elements  20 A relative to the one or more reflective members  50  that correspond to the one or more first light emitting elements  20 A. 
     The first light emitting element wirings  60 A are joined with the one or more first light emitting elements  20 A and the one or more first relay members  40 A so as to surround the one or more reflective members  50  that correspond to the one or more first light emitting elements  20 A. 
     In the case of the light emitting device  1  illustrated in the drawings, the first light emitting element wirings  60 A are joined so as to successively link the one of the two first wirings  161  that is closer to the first light emitting elements  20 A, the first light emitting elements  20 A disposed in the row direction, the relay members  40 , and the other first wiring  161 . There is no first light emitting element wiring  60 A that passes between any two adjacent reflective members  50  disposed in a row direction that correspond to the first light emitting elements  20 A. 
     The second light emitting element wirings  60 B include a wiring  60  that is joined with a second relay member  40 B. This second relay member  40 B is either the second relay member  40 B disposed in the outside-of-row region based on the second light emitting elements  20 B or the second relay member  40 B disposed in the outside-of-row region based on the reflective members  50  corresponding to the second light emitting elements  20 B. The second light emitting element wirings  60 B include wirings  60  joined with one or more second relay members  40 B, and wirings  60  joined with the one or more second light emitting elements  20 B or the one or more submounts  30  on which the one or more second light emitting elements  20 B are mounted. 
     The one or more second light emitting elements  20 B are electrically connected to one of the first wirings  161  and one of the second wirings  162 . The second light emitting element wirings  60 B are joined with the one or more second relay members  40 B positioned on the opposite side of the one or more third light emitting elements  20 C relative to the one or more reflective members  50  corresponding to the one or more third light emitting elements  20 C. The second light emitting element wirings  60 B include the second light emitting element wirings  60 B that are joined with a relay member  40  disposed between two reflecting members  50  that correspond to a second light emitting element  20 B and a third light emitting element  20 C adjacently disposed in the row direction. This relay member  40  is a second relay member  40 B disposed in the outside-of-row region based on the second light emitting elements  20 B. This can achieve the electrical connection of the second light emitting elements  20 B while bypassing the third light emitting elements  20 C. 
     In the case of the light emitting device  1  illustrated in the drawings, in the same row, one or more second light emitting elements  20 B are disposed in one direction from the third light emitting elements  20 C, and one or more second light emitting elements  20 B are disposed in the opposite direction of the one direction from the third light emitting elements  20 C. Referring to these as the second light emitting elements  20 B on one side and the second light emitting elements  20 B on the other side, the second light emitting element wirings  60 B are joined so as to successively link the first wiring  161  in the first row, the second light emitting elements  20 B on one side, multiple relay members  40 , the second light emitting elements  20 B on the other side, and the second wiring  162  in the first row. 
     The third light emitting element wirings  60 C include a wiring  60  that is joined with a first relay member  40 A. This first relay member  40 A may be a first relay member  40 A that is based on any of the first to fourth inter-row regions. The third light emitting element wirings  60 C include wirings  60  connected to the one or more first relay members  40 A that are positioned closer to the first wirings  161  in the row direction than the third light emitting element  20 C that is closest to the first wirings  161 . The third light emitting element wirings  60 C further include wirings  60  connected to the one or more first relay members  40 A disposed closer to the second wirings  162  in the row direction than the third light emitting element  20 C that is closest to the second wirings  162 . 
     The one or more third light emitting elements  20 C are electrically connected to one of the first wirings  161  and one of the second wirings  162 . The third light emitting element wirings  60 C are joined with the one or more first relay members  40 A positioned closer in the column direction to the third light emitting elements  20 C than the first relay member(s)  40 A to which the first light emitting element wirings  60 A are connected in the inter-row region. The third light emitting element wirings  60 C include a third light emitting element wiring  60 C that is joined with a relay member  40  that is positioned between a second light emitting element  20 B and a third light emitting element  20 C adjacently disposed in the row direction. The one or more first relay members  40 A include a first relay member  40 A that is joined with the wiring  60  whose other end is joined with a third light emitting element  20 C or the submount  30  equipped with the third light emitting element  20 C and the wiring  60  whose other end is joined with the first relay member  40 A with which a first light emitting element wiring  60 A is joined. 
     In the case of the light emitting device  1  illustrated in the drawings, the third light emitting element wirings  60 C are joined so as to successively link the first wiring  161  in the first row, one or more first relay members  40 A, the third light emitting elements  20 C disposed in the row direction, one or more first relay members  40 A, and the second wiring  162  in the second row. 
     The one or more relay members  40  include a relay member  40  with which a first light emitting element wiring  60 A and a second light emitting element wiring  60 B are joined. The wirings  60  include a wiring  60  that serves as both a first light emitting element wiring  60 A and a second light emitting element wiring  60 B. This can simplify the wiring. 
     The one or more relay members  40  include a relay member  40  with which a first light emitting element wiring  60 A and a third light emitting element wiring  60 C are joined. A first relay member  40 A is applicable to this relay member  40 . The wirings  60  include a wiring  60  that serves as both a first light emitting element wiring  60 A and a third light emitting element wiring  60 C. This can allow two current paths to converge at a desired position. 
     A relay member  40  with which a first light emitting element wiring  60 A and a second light emitting element wiring  60 B are joined may differ from a relay member  40  with which a first light emitting element wiring  60 A and a third light emitting element wiring  60 C are joined. This can adjust the number of wirings joined with a relay member  40 . 
     In the configuration that allows for current path convergence in this manner, the wirings  60  would include those that function only as the first light emitting element wirings  60 A, those that function only as the second light emitting element wirings  60 B, those that function only as the third light emitting element wirings  60 C, and those that function at least as the first light emitting element wirings  60 A and the second light emitting element wirings  60 B. The wirings  60  can include those that function at least as the first light emitting element wirings  60 A and the third light emitting element wirings  60 C. The wirings  60  can further include those that function as the first light emitting element wirings  60 A, the second light emitting element wirings  60 B, and the third light emitting element wirings  60 C. 
     The relay members  40  include a relay member  40  at which current paths related to the first light emitting element(s)  20 A, the second light emitting element(s)  20 B, and the third light emitting element(s)  20 C converge. A third relay member  40 C is applicable to this relay member. The wirings  60  joined with the first relay member(s)  40 A do not include the wirings  60  that function as the first light emitting element wirings  60 A, function as the second light emitting element wirings  60 B, and further function as the third light emitting element wirings  60 C. 
     In the case of the light emitting device  1  illustrated in the drawings, the current path for electrically connecting the first light emitting elements  20 A to two wirings  16  are configured to have a first section for electrically connecting only the first light emitting elements  20 A, a second section for electrically connecting the first light emitting elements  20 A and the third light emitting elements  20 C, and a third section for electrically connecting the first light emitting elements  20 A, the second light emitting elements  20 B, and the third light emitting elements  20 C. The physical lengths of the sections from longest to shortest are the first section, the second section, and the third section. The section length of the first section is at least twice the sum of the second section length and the third section length. 
     In the light emitting device  1 , the relay members  40  include a relay member  40  that is smaller in area than that of a submount  30  in the top view. The relay members  40  can each have a smaller area than that of a submount  30 . This can provide convenience in selecting the number or the positions of the relay members  40  that are disposed in the inter-row regions. 
     The number of relay members  40  disposed in the light emitting device  1  can be greater than 2×N. The number of relay members  40  disposed in the light emitting device  1  can be greater than the number of the light emitting elements  20 . The number of relay members  40  disposed in the light emitting device  1  can be greater than the number of submounts  30 . 
     The relay members  40  are formed by using the same material or the same primary material as that for the submounts  30 . The relay members  40  may be formed by using a different primary material from that for the submounts  30 . In this case, the submounts  30  preferably have a higher thermal conductivity than the relay members  40 . It is preferable to consider the heat dissipation properties of the submounts  30  with respect to the heat generated by the light emitting elements  20 . On the other hand, the relay members  40  are not equipped with any light emitting element  20 , and thus there might be a case in which the thermal conductivity of the relay members can be lower than that of the submounts  30 . 
     The sealing member  70  seals the space in which the light emitting elements  20  are disposed. The light emitting elements  20  can be disposed in a hermetically sealed space. This can suppress the dust from collecting on the light emitting elements  20  to thereby reduce light quality degradation. 
     The sealing member  70  is disposed on the lateral wall of the base  10 . The upper face of the lateral wall and the lower face of the sealing member  70  are bonded together. The frame portion of the sealing member  70  is bonded to the lateral wall. The light reflected by the reflective members  50  transmits through the sealing member  70 . The main portion of the light passes through the light transmitting part of the sealing member  70  to exit the sealing member  70 . At least 90% of the main portion of the light from the light emitting elements  20  is output from the sealing member  70 . 
     The lens member  80  is positioned above the light emitting elements  20 . The lens member  80  is disposed above the sealing member  70 . The lens member  80  is bonded to the sealing member  70 . The lens member  80  is bonded by using, for example, a UV-curable adhesive. Using a UV-curable adhesive can allow the lens member  80  to be adjusted to a desired mounting position before being bonded. 
     The lens member  80  is disposed so as to allow the light emitted by the individual light emitting elements  20  to pass through the individual lens faces before exiting the lens member. 
     Variations of First Embodiment 
     A light emitting device according to Variations of the First Embodiment will be explained next. In each of the several Variations presented below, the layout of the light emitting elements  20  differs from that of the light emitting device  1  according to the First Embodiment discussed above. Accordingly, there are differences in the way the wirings  60  are connected and the layout of the relay members  40  attributable to the differences in the layout of the light emitting elements  20 . 
     In each Variation of the light emitting device, the base  10 , the reflective members  50 , the sealing member  70 , and the lens member  80  are the same as those in the light emitting device  1  of the First Embodiment. Accordingly, for these constituent elements, the description explained with reference to the light emitting device  1  of the First Embodiment applies. 
     In each Variation of the light emitting device, the same explanation of each of the constituent elements, such as the light emitting elements  20 , the submounts  30 , the relay members  40 , and the wirings  60 , as those provided with reference to the First Embodiment applies. 
       FIG. 1  is a perspective view of a light emitting device related to each Variation,  FIG. 2  is a top view of the light emitting device according to each Variation. In each Variation, the same definitions of inter-row, intra-row, outside-of-row regions as those described with reference to the light emitting device  1  according to the First Embodiment apply. 
       FIG. 6  to  FIG. 9  are drawings related to Variations described below. For each Variation of the light emitting device, the same is true with respect to the description that has been given in reference to the light emitting device  1  of the First Embodiment to the extent that there is no inconsistency in the comparison with the drawings for the Variations. 
     First Variation 
       FIG. 6  is a top view illustrating the wiring for electrically connecting the light emitting elements in a light emitting device  1 A of a First Variation. In the case of the light emitting device  1 A illustrated in the drawing, the first to seventh columns in the second row are the first light emitting elements  20 A, the first to third, sixth, and seventh columns in the first row are the second light emitting elements  20 B, and the fourth and fifth columns in the first row are the third light emitting elements  20 C. The first light emitting element  20 A emit blue light, second light emitting elements  20 B emit red light, and third light emitting elements  20 C emit green light. 
     In the light emitting device  1 A, the second light emitting elements  20 B are disposed on both sides of the third light emitting elements  20 C so as to interpose the third light emitting elements  20 C. With respect to the second light emitting elements  20 B disposed on both sides, the peak wavelengths of the light emitted by the second light emitting elements  20 B disposed on one side are higher by 3 nm to 10 nm than the peak wavelengths of the light emitted by the second light emitting elements  20 B disposed on the other side. 
     Multiple second light emitting elements  20 B are disposed on one side, and multiple second light emitting elements  20 B are disposed on the other side. The peak wavelengths of the light emitted by the second light emitting elements  20 B disposed on one side are set to be close to each other with a difference of less than 3 nm among them. The peak wavelengths of the light emitted by the second light emitting elements  20 B disposed on the other side are set to be close to each other with a difference of less than 3 nm among them. 
     The second light emitting elements  20 B disposed on one side is greater in number, and emit light of a shorter peak wavelength, than the second light emitting elements  20 B disposed on the other side. In the case of using red light emitting elements, for example, because the light of a shorter peak wavelength has a higher relative luminous efficiency, providing a larger number of light emitting elements that emit light of a shorter peak wavelength can achieve brighter visual perception. 
     In the state of being mounted on the submounts  30 , the electrodes on the upper faces of the first light emitting elements  20 A in the light emitting device  1  and the electrodes on the upper faces of the first light emitting elements  20 A in the light emitting device  1 A are different. In the light emitting device  1 , a wiring  60  is joined with the submount  30  on which, among the first light emitting elements  20 A disposed in the row direction, the first light emitting element  20 A positioned at one end is mounted, and a first relay member  40 A. In the light emitting device  1 A, a wiring  60  is joined with the upper face of the first light emitting element  20 A positioned at one end among the first light emitting elements  20 A disposed in the row direction, and a relay member  40  disposed on the outside of the inter-row region (hereinafter referred to as the fourth relay member  40 D). In the light emitting device  1 A illustrated in the drawing, the fourth relay member  40 D is disposed in the fourth outside-of-row region. By providing a fourth relay member  40 D in this manner, the wirings  60  can be joined without being positioned in the optical paths of the light reflected by the reflective members  50 . 
     Second Variation 
       FIG. 7  is a top view illustrating the wiring for electrically connecting the light emitting elements in a light emitting device  1 B of a Second Variation. The layout and the emission colors of the first light emitting elements  20 A, the second light emitting elements  20 B, and the third light emitting elements  20 C of the light emitting device  1 B are similar to those in the light emitting device  1 . 
     In the light emitting device  1 B, the first light emitting elements  20 A include first light emitting element(s)  20 A emitting light of a peak wavelength that is a first wavelength, first light emitting element(s)  20 A emitting light of a peak wavelength that is a second wavelength, and first light emitting element(s)  20 A emitting light of a peak wavelength that is a third wavelength, which will hereinafter simply be referred to as a first light emitting element  20 A of the first wavelength, a first light emitting element  20 A of the second wavelength, and a first light emitting element  20 A of the third wavelength, respectively. 
     In the light emitting device  1 B, the number of the first light emitting elements  20 A of the first wavelength is greater than the number of the first light emitting element(s)  20 A of the second wavelength. The number of the first light emitting elements  20 A of the first wavelength is greater than the number of the first light emitting element(s)  20 A of the third wavelength. 
     The first light emitting elements  20 A of the first wavelength include a first light emitting element  20 A positioned between a first light emitting element  20 A of the second wavelength and a first light emitting element  20 A of the third wavelength. The first light emitting elements  20 A include a first light emitting element  20 A of the second wavelength positioned between two first light emitting elements  20 A of the first wavelength. The first light emitting elements  20 A include a first light emitting element  20 A of the third wavelength positioned between two first light emitting elements  20 A of the first wavelength. 
     In the first light emitting elements  20 A disposed in a row, there is a difference in the 3 nm to 10 nm range between the peak wavelengths of the light emitted by two adjacent first light emitting elements  20 A. The first light emitting elements  20 A are disposed such that no two elements of the same wavelength among the first, second, and third wavelengths, are adjacent with one another. 
     In the light emitting device  1 B illustrated in the drawing, the peak wavelength of the light emitted by a first light emitting element  20 A of the first wavelength is  640  nm at most. The peak wavelength of the light emitted by a first light emitting element  20 A of the third wavelength is at least 645 nm. The peak wavelength difference between a first light emitting element  20 A of the minimum peak wavelength and a first light emitting element  20 A of the maximum peak wavelength among the first light emitting elements  20 A is 10 nm at most. First light emitting elements  20 A of the first wavelength are positioned at both ends and first light emitting elements  20 A of the first wavelength are positioned between these both ends of the row. Using the first light emitting element  20 A of the first wavelength positioned between these both ends as a reference point, the first light emitting elements  20 A of the second wavelength and the first light emitting elements  20 A of the third wavelength are symmetrically disposed. 
     In the light emitting device  1 B, the current flows in a reverse direction as compared to the light emitting device  1 . In the light emitting device  1 , a wiring  60  was joined with the submount  30  on which, among the first light emitting elements  20 A disposed in the row direction, the first light emitting element  20 A positioned at one end and a first relay member  40 A. In the light emitting device  1 B, a wiring  60  is joined with the upper face of the first light emitting element  20 A at one end among the first light emitting elements  20 A disposed in the row direction and a first relay member  40 A. This first relay member  40 A is positioned between two reflective members  50 . This first relay member  40 A is disposed in the intra-row region based on the reflective members  50  corresponding to the first light emitting elements  20 A. In the light emitting device  1 B, the first light emitting element wirings  60 A that pass between the two adjacent reflective members  50  among the reflective members  50  corresponding to the first light emitting elements  20 A and disposed in the row direction are present. Disposing the first relay member  40 A in this manner can reduce the number of relay members  40 . 
     Third Variation 
       FIG. 8  is a top view illustrating the wiring for electrically connecting the light emitting elements in a light emitting device  1 C of a Third Variation. In the case of the light emitting device  1 C illustrated in the drawing, the first, fourth, and seventh columns in the second row are the first light emitting elements  20 A, the first to seventh columns in the first row are the second light emitting elements  20 B, and the second, third, fifth, and sixth columns in the second row are the third light emitting elements  20 C. The first light emitting elements  20 A emit blue light, second light emitting elements  20 B emit red light, and third light emitting elements  20 C emit green light. 
     In the light emitting device  1 C, one or more second relay members  40 B are disposed in the outside-of-row regions on both sides in the column direction so as to interpose the inter-row regions. The light emitting device  1 C has one or more second relay members  40 B disposed in the first or second outside-of-row region, and one or more second relay members  40 B disposed in the third or fourth outside-of-row region. The light emitting device  1 C illustrated in the drawing has multiple second relay members  40 B disposed in the second outside-of-row region, and multiple second relay members  40 B disposed in the third outside-of-row region. 
     The light emitting device  1 C has first light emitting elements  20 A positioned at both ends in the row direction and first light emitting element  20 A positioned between these both ends, and the third light emitting elements  20 C that interpose the first light emitting element  20 A positioned between these both ends. Using the first light emitting element  20 A positioned between these both ends as a reference point, the third light emitting elements  20 C and the other first light emitting elements  20 A are symmetrically disposed. 
     The wavelength setting and the layout of the second light emitting elements  20 B disposed in the row direction in the light emitting device  1 C illustrated in the drawing are similar to those of the first light emitting elements  20 A in the light emitting device  1  or  1 B. In the light emitting device  1 C, the second light emitting elements  20 B of the first wavelength, the second light emitting elements  20 B of the second wavelength, and the second light emitting elements  20 B of the third wavelength are disposed in a similar manner to that of the first light emitting elements  20 A in the light emitting deice  1 B. 
     In a light emitting device  1 C, one or more first light emitting elements  20 A are electrically connected to one of the first wirings  161  and one of the second wirings  162 , one or more second light emitting elements  20 B are electrically connected to both of the second wirings  162 , and one or more third light emitting elements  20 C are electrically connected to one of the first wirings  161  and one of the second wirings  162 . 
     Fourth Variation 
       FIG. 9  is a top view illustrating the wiring for electrically connecting the light emitting elements in a light emitting device  1 D of a Fourth Variation. In the light emitting device  1 D, the first light emitting elements  20 A, the second light emitting elements  20 B, and the third light emitting elements  20 C are disposed in a row. The first light emitting elements  20 A, the second light emitting elements  20 B, and the third light emitting elements  20 C are disposed in both two rows. The light emitting elements  20  are disposed in the first and second rows such that those emitting the same color light are disposed in the same columns. 
     In the case of the light emitting device  1 D illustrated in the drawing, the fifth to the seventh columns in the first and the second rows are the first light emitting elements  20 A, the third and the fourth columns in the first and the second rows are the second light emitting elements  20 B, and the first and the second columns in the first and the second rows are the third light emitting elements  20 C. The first light emitting elements  20 A emit red light second light emitting elements  20 B emit blue light, and third light emitting elements  20 C emit green light. 
     In the light emitting device  1 D, the second relay members  40 B are disposed in two rows in the outside-of-row regions. In each of the two rows, one or more second relay members  40 B are disposed. Each of the current path through the one or more second relay members  40 B disposed in the first row and the current path through the one or more second relay members  40 B disposed in the second row electrically connects the light emitting elements  20  that emit different colors from one another. 
     In the light emitting device  1 D, in order to electrically connect the first light emitting elements  20 A in the first row and the second row, one or more first relay members  40 A are disposed in the inter-row region. In order to electrically connect the second light emitting elements  20 B in the first row and the second row, one or more first relay members  40 A are disposed in the inter-row region. In order to electrically connect the third light emitting elements  20 C in the first row and the second row, one or more first relay members  40 A are disposed in the inter-row region. 
     In the light emitting device  1 D, no relay member  40  with which a wiring  60  serving as both the first light emitting element wiring  60 A and the second light emitting element wiring  60 B is joined is disposed in the first inter-row region. No relay member  40  with which a wiring  60  serving as both the first light emitting element wiring  60 A and the third light emitting element wiring  60 C is joined is disposed in the first inter-row region. No relay member  40  with which a wiring  60  serving as both the second light emitting element wiring  60 B and the third light emitting element wiring  60 C is joined is disposed in the first inter-row region. 
     Second Embodiment 
     Subsequently, a light emitting device  2  according to a Second Embodiment is described.  FIG. 1  to  FIG. 3  and  FIG. 10  illustrate exemplary aspects according to the Second Embodiment.  FIG. 1  is a perspective view of the light emitting element  2 .  FIG. 2  is a top view of the second light emitting element  2 .  FIG. 3  is a cross-sectional view taken along a line in  FIG. 2 .  FIG. 10  is a top view illustrating the wirings for electrically connecting a plurality of light emitting element in the light emitting device  2 . Also in the Second Embodiment, definitions of the inter-row regions, the intra-row regions, and the outside-of-row regions are the same as those defined for the light emitting device  1 . 
     The light emitting device  2  includes a plurality of constituent elements. The constituent elements include a base  10 , a plurality of light emitting elements  20 , a plurality of submounts  30 , one or more relay members  40 , a plurality of reflective members  50 , a plurality of wirings  60 , a sealing member  70 , and a lens member  80 . The light emitting device  2  may include other elements besides those described above. Furthermore, the light emitting device  2  does not have to include a certain element among those listed here. 
     The descriptions for the light emitting device  1  and constituent elements of the First Embodiment given above that has no inconsistency to  FIG. 1  to  FIG. 3  and  FIG. 10  according to the Second Embodiment are similarly applied as the descriptions for the light emitting device  2 . 
     The light emitting device  2  includes a plurality of light emitting elements  20 , one or more first light emitting elements  20 A, and one or more second light emitting elements  20 B. The first light emitting elements  20 A and the second light emitting elements  20 B are electrically connected so as to be capable of independent driving. 
     The first light emitting elements  20 A and the second light emitting elements  20 B emit light of the same color. Each of the first light emitting elements  20 A and the second light emitting elements  20 B emit light of a color selected from the group consisting of red, green and blue. For example, the first light emitting elements  20 A and the second light emitting elements  20 B emit light of blue color. 
     As compared to the case in which all the light emitting elements  20  disposed in a row direction are serially connected, and the light emitting elements  20  disposed in different row(s) are independently driven, for example, a degree of entire light emitted by each driving can be within a region approximate to a square. Such a region may be preferable for an optical control in some cases. 
     Alternatively, the first light emitting elements  20 A and the second light emitting elements  20 B can emit light of colors different from each other. Each of the first light emitting elements  20 A and the second light emitting elements  20 B emit light of a color selected from the group consisting of red, green and blue. For example, the first light emitting elements  20 A emit blue light, and the second light emitting elements  20 B emit green light. 
     In the example of the light emitting device  2  shown in the drawings, the first light emitting elements  20 A are positioned from the first column to the fifth column in the first row, and from the first column to the fifth column in the second row. Also, the second light emitting elements  20 B are positioned from the sixth column and the seventh column in the first row, and from the sixth column and the seventh column in the second row. The first light emitting elements  20 A emit blue light and the second light emitting elements  20 B emit green light. 
     With respect to the light emitting elements  20  disposed in rows and columns, both of the first light emitting element(s)  20 A and the second light emitting element(s)  20 B are disposed in each of adjacent two rows. In each adjacent two rows, the plurality of first light emitting elements  20 A and the plurality of second light emitting elements  20 B are disposed in the same row. 
     As the example of the light emitting device  2  shown in  FIG. 10 , an aspect in which relay members  40  are disposed in intra-row region based on the reflective members  50  disposed in the first row. Also, an aspect in which relay members  40  are disposed in intra-row region based on the reflective members  50  disposed in the second row. 
     In the light emitting device  2 , the first light emitting element wirings  60 A are connected to two first wirings  161  among the plurality of wirings  16 , and the second light emitting element wirings  162  are connected to the second wirings  162  among the plurality of wirings  16 . The first light emitting element wirings  60 A are not connected to any one of the second wirings  162 , and the second light emitting element wirings  60 B are connected to any one of the first wirings  161 . 
     In a top view, a relay member  40  connected to the first light emitting element wiring  60 A and the relay member  40  connected to the second light emitting element  60 B are disposed in a region between two virtual lines that are parallel to each other in the column direction and respectively passing through the first light emitting element  20 A and the second light emitting element  20 B (the first light emitting element  20 A in the fifth row and the second light emitting element  20 B in the sixth row in  FIG. 10 ) 
     In between these two virtual lines, the relay member  40  connected to the first light emitting element wiring  60 A is disposed in the intra-row region, and the relay member  40  connected to the second light emitting element wiring  60 B is disposed in the outside-of-row region. In the example of the light emitting device  2  shown in the drawing, the relay member  40  connected to the first light emitting element wiring  60 A is disposed in the first intra-row region, and the relay members  40  connected to the second light emitting element wiring  60 B are respectively disposed in the first outside-of-row region and the third outside-of-row region. 
     Except for the third relay member  40 C, the relay members  40  connected to the first light emitting element  60 A are not disposed in neither a region in which the first outside-of-row region and the second outside-of-row region overlap, nor a region in which the third outside-of-row region and the fourth outside-of-row region overlap. The one or more relay member  40  connected to the second light emitting element wiring  60 B but not the third relay member  40 C are disposed in the region in which the first outside-of-row region and the second outside-of-row region overlap, and the region in which the third outside-of-row region and the fourth outside-of-row region overlap. 
     Among the first light emitting element  20 A and the second light emitting element  20 B adjacent to each other in the row direction, the second light emitting element wiring  60 B and the relay member  40  connected to the second light emitting element wiring  60 B are not disposed in a region, in which no second light emitting element(s)  20 B is disposed, provided by dividing the disposition region into two regions by a virtual line that is parallel to the column direction and passes through the first light emitting elements  20 A. 
     Among the first light emitting element  20 A and the second light emitting element  20 B adjacent to each other in the row direction, the first light emitting element wiring  60 A and the relay member  40  connected to the first light emitting element wiring  60 A are not disposed in a region, in which no first light emitting element(s)  20 A is disposed, provided by dividing the disposition region into two regions by a virtual line that is parallel to the column direction and passes through the second light emitting elements  20 B. 
     Variations of Second Embodiment 
     Subsequently, light emitting devices according to Variations of the Second Embodiment will be described. Several Variations will be described below. The light emitting devices in the several Variations are different from the light emitting device  2  according to the Second Embodiment in the arrangement of the plurality of light emitting elements  20 . Accordingly, there are some differences in the connection manner of the wirings  60  or the arrangement of the relay members  40  due to the difference of the arrangement of the light emitting elements  20 . 
     The base  10 , the reflective members  50 , the sealing member  70 , and the lens member  80  in the light emitting device in each Variation are the same as those of the light emitting device  2  according to the Second Embodiment. Accordingly, the same descriptions for these constituent elements of the light emitting device  1  according to the First Embodiment are applied as those for Variation. 
     The descriptions for the constituent elements of the light emitting elements  20 , the submounts  30 , the relay members  40 , and the wirings  60  in the light emitting devices in Variations are the same as or similar to those in the constituent elements in the First Embodiment. 
       FIG. 1  is a perspective view of the light emitting device in Variations.  FIG. 2  is a top view of the light emitting device in Variations. The same definitions of inter-row, intra-row, outside-of-row regions for the light emitting device  1  according to First Embodiment are applied as the definitions for those in Variations. 
       FIG. 11  and  FIG. 12  relate to illustrations of Variations described below. The descriptions for the light emitting device  2  according to the Second Embodiment given above that has no inconsistency to the drawings of Variations is similarly applied as the descriptions for the light emitting devices in Variations. 
     First Variation 
       FIG. 11  is a top view illustrating the wirings for electrically connecting the plurality of light emitting elements in the light emitting device  2 A according to a First Variation. In the example of the light emitting device  2 A shown in the drawings, the first light emitting elements  20 A are positioned from the first column to the fourth column in the first row, and from the first column to the fourth column in the second row. Also, the second light emitting elements  20 B are positioned from the fifth column to the seventh column in the first row, and from the fifth column to the seventh column in the second row. 
     As shown in the Second Embodiment and the First Variation, the first light emitting elements  20 A can be disposed in one region and the second light emitting elements  20 B can be disposed in the other region demarcated from the one region using certain adjacent two columns in plurality of rows as a border. In such a case, the certain two columns can be appropriately selected. 
     Second Variation 
       FIG. 12  is a top view illustrating the wirings for electrically connecting the plurality of light emitting elements in the light emitting device  2 B according to a Second Variation. In the example of the light emitting device  2 B shown in the drawings, the first light emitting elements  20 A are positioned from the first column to the third column in the first row, and from the first column to the fourth column in the second row. Also, the second light emitting elements  20 B are positioned from the fourth column to the seventh column in the first row, and from the fifth column to the seventh column in the second row. 
     In the light emitting device  2 B, an equal number of the first light emitting elements  20 A and the second light emitting elements  20 B is disposed in two rows and M columns (M is a natural number not less than 3 and is an odd number). Only in the middle column (the ordinal number as the number of columns obtained by dividing M+1 by 2) in M columns, the first light emitting element  20 A is positioned in one row of the two rows and the second light emitting element  20 B is positioned in the other row. Either case in which the first light emitting elements  20 A are positioned in both of the two columns, or the second light emitting elements  20 B are positioned in both of the two columns, is applied to other columns. 
     The relay member  40  connected to the first light emitting element wiring  60 A and the relay member  40  connected to the second light emitting element wiring  60 B are positioned between two virtual lines that are parallel to each other and respectively pass through the first light emitting elements  20 A positioned in both sides of the middle column. The relay member  40  connected to the first light emitting element wiring  60 A is positioned in a region between these two virtual lines in the inter-row region. 
     Third Embodiment 
     A light emitting device  3  according to a Third Embodiment is described.  FIG. 13  to  FIG. 16D  are schematic views illustrating exemplary aspects of the light emitting device  3 .  FIG. 13  is a schematic view of a light emitting element  20  of the light emitting device  3 .  FIG. 14A  and  FIG. 14B  are top views each illustrating a conventional wiring aspect for the light emitting element  20 .  FIG. 15A  to  FIG. 15F  are top views each illustrating an example wiring aspect for the light emitting element  20  of the light emitting device  3 .  FIG. 16A  is a graph showing a comparison of temperature characteristics of the optical outputs between the example wirings in  FIG. 14A ,  FIG. 14B ,  FIG. 15A , and  FIG. 15B .  FIG. 16B  is a graph showing a comparison of temperature characteristics of the forward voltages between the example wirings in  FIG. 14A ,  FIG. 14B ,  FIG. 15A , and  FIG. 15B .  FIG. 16C  is a graph showing a comparison of the temperature characteristics of the forward voltages between the example wirings in  FIG. 15B ,  FIG. 15C , and FIG,  15 D.  FIG. 16D  is a graph showing a comparison of the temperature characteristics of the forward voltages between the example wirings in  FIG. 15A ,  FIG. 15E , and  FIG. 15F . 
       FIG. 1  to  FIG. 9  are applicable as drawings illustrating the light emitting device  3 . The description of the light emitting device according to the First Embodiment and Variations also applicable as a description of the light emitting device  3 . However, among the illustrations and description for the light emitting devices of the First Embodiment and Variations above, those inconsistent to the illustrations among  FIG. 13  to  FIG. 16D  and description below according to the light emitting device  3  are not applicable as the illustrations and description for the light emitting device  3 . 
     The light emitting device  3  includes a plurality of constituent elements. The constituent elements include a base  10 , one or more light emitting elements  20 , one or more submounts  30 , one or more relay members  40 , one or more reflective members  50 , a plurality of wirings  60 , a sealing member  70 , and a lens member  80 . 
     The light emitting device  3  can include other elements besides those described above. The light emitting device  3  does not have to have the same structure as the light emitting device according to the First Embodiment or the Variations. Disclosures of the light emitting device  3  according to the Third Embodiment is applicable without limiting to the light emitting device in which the light emitting elements disposed in a row are electrically connected in separate two groups each independently drivable. 
     The one or more light emitting elements  20  in the light emitting device  3  include a light emitting element having two or more light-emitting points  21  on the light emitting face. The light emitting elements  20  are, for example, semiconductor laser elements. A first light emitting element  20 A in the light emitting device  3  may be such a light emitting element  20  having two or more light-emitting points  21 . The light emitting device  3  is described as that the first light emitting element  20 A is this light emitting element  20 , as a matter of convenience. In place of the first light emitting element  20 A, or as the first light emitting element  20 A, a second light emitting element  20 B or a third light emitting element  20 C can have two or more light-emitting points  21  on its light emitting face. 
     The first light emitting element  20 A has two or more waveguides  22  respectively corresponding to the light-emitting points  21 . Two or more waveguides  22  extend along a direction perpendicular to the light-emitting face in a top view. Here, the “perpendicular” include a tolerance of ±5°. The waveguides  22  do not have to be extend in the direction perpendicular to the light-emitting face. 
       FIG. 13  shows the light emitting element  20  having two light-emitting points  21  (i.e., a first light-emitting point  21 A and a second light-emitting point  21 B).  FIG. 13  also shows the light emitting element  20  having a first waveguide  22 A corresponding to the first-light emitting point  21 A, and a second waveguide  22 B corresponding to the second light-emitting point  21 B. 
       FIG. 14A  and  FIG. 14B  show conventional aspects each in which the wirings  60  are connected to the light emitting element  20 A having the two light-emitting points  21  and the two waveguides  22 . As shown in these figures, the wirings  60  are connected such that the connection positions thereof are located directly above the waveguides  22  on the upper face of the first light emitting element  20 A meeting its light-emitting face. The wirings  60  are connected such that number thereof is equivalent directly above each waveguide  22 . 
     It is considered that such a connection aspect is applied to reflect a technical idea that the connection of the wirings  60  symmetrically or equivalent to each waveguides  22  as much as possible may bring an equivalent electric current flow, and therefore unevenness of the optical output and/or unevenness of the electrical load applied to the waveguides  22  would not occur to stably operate the light emitting element. 
     However, depending on the volume of the current input to the first light emitting element  20 , the number of the wirings  60  connected to the first light emitting element  20 A is preferably plural, but not one. Such a case corresponds to the aspect in which the wirings  60  are connected in a manner as shown in  FIG. 14A  or  FIG. 14B . According to the technical idea, the number of the wirings  60  connected to the first light emitting element  20 A is the integer multiple of the number of the waveguides  22 . For example, the number of the wirings  60  is intended to be 2 in relation to the input current, it can be considered that two wirings  60  are provided for each waveguide  22  in consideration of the electrical load to the waveguides  22 . 
       FIG. 15A  to  FIG. 15F  show example connection aspects of the wirings  60  that are not based on such a conventional aspect or technical idea. The connection aspects exemplary shown here can be applied to the light emitting device  3  in which two to five wirings  60  are connected to the upper face of one first light emitting element  20 A. Without limiting thereto, these aspects can be applicable to the light emitting device  3  in which six or more wirings  60  are connected to the upper face of one first light emitting element  20 A. 
     A plurality of the wirings  60  are connected to the upper face of the first light emitting element  20 A in the light emitting device  3 . First light emitting element wirings  60 A include a plurality of wirings  60  connected to the upper face of the first light emitting element  20 A. The wirings  60  connected to the upper face of one first light emitting element  20 A described here can be limited to applicable wirings  60  of which one end is connected to the upper face of the first light emitting element  20 A and the other end is connected to the common constituent elements except for the first light emitting element  20 A. In other words, among the wirings  60 , one(s) connected to constituent element(s) different from the common constituent element at the other end can be excluded. For example, in the case in which the wirings  60  connected to the upper face of the first light emitting element  20 A include the wirings  60  connected to the submount  30  at the other end, and include the wiring(s)  60  connected to Zener diode at the other end, the latter can be excluded from the applicable wirings  60 . 
     As shown in  FIG. 15A  to  FIG. 15F , the number of the wirings  60  connected to the upper face of the first light emitting element  20 A is two or more. As shown in  FIG. 15B to 15D , the number of the wirings  60  connected to the upper face of the first light emitting element  20 A is three or more. Accordingly, the number of the wirings  60  connected to the upper face of the first light emitting element  20 A can be even number or odd number. In other words, odd number of the wirings  60  can be connected to the light emitting element  20  having two waveguides  22 . 
     In the light emitting device  3 , in the upper face of the first light emitting element  20 A, (i) the number of the wirings  60  whose connection position(s) is located in a region overlapping the first waveguide  22 A, and (ii) the number of the wirings  60  whose connection position(s) is located in a region overlapping the second waveguide  22 B, are both zero. Alternatively, in the case in which at least one of (i) and (ii) is one or more, (i) and (ii) are not the same number.  FIG. 15A ,  FIG. 15B ,  FIG. 15E , and  FIG. 15F  show examples of the former (i.e., both (i) and (ii) are zero), and  FIG. 15C  and  FIG. 15D  show examples of the latter (i.e., at least one of (i) and (ii) is one or more and is not the same number). The connection position refers to the center point of the connection shape of the wiring  60  connected to the upper face. 
     In regard to the wirings  60  connected to the upper face of the first light emitting element  20 A, the connection position(s) of the wirings  60  and the upper face of the first light emitting element  20 A is located between (iii) a virtual line passing through the point on the first waveguide  22 A closest to the second waveguide  22 B and being perpendicular to the light-emitting face (hereinafter also referred to as first virtual line) and (iv) a virtual line passing through the point on the second waveguide  22 B closest to the first waveguide  22 A and being perpendicular to the light-emitting face (hereinafter also referred to as second virtual line). “A region between the first virtual line and the second virtual line” does not include a line on the first virtual line and a line on the second virtual line.  FIG. 15A ,  FIG. 15B ,  FIG. 15E , and  FIG. 15F  show the examples of these. Setting the connection position(s) of the wirings  60  in this region can make the connection more stable than in the case in which the wirings  60  is connected on the edge(s) of the upper face of the first light emitting element  20 A. 
     In regard to the wirings  60  connected to the upper face of the first light emitting element  20 A, the connection position(s) of the wirings  60  and the upper face of the first light emitting element  20 A is located in a region including the second waveguide  22 B using the first virtual line as a boarder in a top view, or a region including the first waveguide  22 A using the second virtual line as a boarder in a top view. As the identification of these regions, the line in the first virtual line and the line in the second virtual line are not included in these regions.  FIG. 15D  shows the former example, and  FIG. 15C  shows the latter example. 
     In regard to the wirings  60  connected to the upper face of the first light emitting element  20 A, in the upper face of the first light emitting element  20 A connected to the wirings  60 , no wiring  60  is provided whose connection position is located in a region that does not include the second waveguide  22 B in a top view assuming that the upper face of the first light emitting element  20 A is divided into two regions using the first virtual line as the boarder, and no wiring  60  is provided whose connection position is located in a region that does not include the first waveguide  22 A in a top view assuming that the upper face of the first light emitting element  20 A is divided into two regions using the second virtual line as the boarder. As the identification of these regions, the line on the first virtual line and the line on the second virtual line are not included in these regions.  FIG. 15A ,  FIG. 15B ,  FIG. 15E , and  FIG. 15F  show example of these. 
     In regard to the wirings  60  connected to the upper face of the first light emitting element  20 A, a region including the first waveguide  22 A and a region including the second waveguide  22 B are defined assuming that the upper face of the first light emitting element  20 A is divided into two regions using a virtual line that is a median line of the first virtual line and the second virtual line (hereinafter also referred to as third virtual line). The number (v) of the wirings whose connection position(s) is located in a region including the first waveguide  22 A and the number (vi) of the wirings whose connection position(s) is located in a region including the second waveguide  22 B are both zero. Alternatively, in the case in which at least one of (v) and (vi) is one or more, (v) and (vi) are not the same number. As the identification of these regions, the line on the third virtual line is not included in these regions. 
     On the upper face of the first light emitting element  20 A and in a direction perpendicular to the light-emitting face, a distance between a wiring  60  closest to the light-emitting face and a wiring  60  farthest from the light-emitting face is greater than an absolute value of a distance difference between a distance from the light-emitting face to the wiring  60  closest to the light-emitting face and a distance from a face positioned opposite to the light-emitting face to the wiring  60  farthest from the light-emitting face. This example is shown in all figures among  FIG. 15A  to  FIG. 15F  except for  FIG. 15E . 
     In the direction perpendicular to the light-emitting face, the distance between and the plurality of wirings  60  connected to the upper face of the first light emitting element  20 A is 200 μm to 500 μm. The number of the wirings  60  connected to the upper face of the first light emitting element  20 A is a value obtained by dividing a length in the direction perpendicular to the light-emitting face of the first light emitting element  20 A by 500 μm (figures below a decimal point is omitted) or more, and a value obtained by dividing the length in the direction perpendicular to the light-emitting face of the first light emitting element  20 A by 200 μm (figures below a decimal point is omitted) or less. 
     Consideration of test results shown in  FIG. 16A  to  FIG. 16D  are given below. In the tests of  FIG. 16A  to  FIG. 16D , a semiconductor laser element emitting laser light having a peak wavelength of 643 nm as the first light emitting element  20 A. For connection aspects of the wirings  60  shown in  FIG. 15A  to  FIG. 15F , five first light emitting element  20 A are provided, and averages of measured values of these five elements are plotted as the measurement results in  FIG. 16A  to  FIG. 16D . Temperature characteristics are measured at 25° C., 45° C., and 60° C. The temperatures are obtained by operating the semiconductor laser elements sealed in the packages and measuring the temperatures of the packages. 
     As show in  FIG. 16A , even when the number of the wirings  60  connected to the upper face of the first light emitting element  20 A is changed, there is no significant difference in the temperature characteristics of optical output [W]. Also, there is no significant difference as compared to the conventional connection aspect such that the number of the wrings for each waveguide  22  corresponds to each other. In other words, it can be said that there is no significant on the temperature characteristics of optical output Po[W] even when employing a connection aspect other than the conventional connection aspect. 
     As shown in  FIG. 16B , the forward voltage Vf[V] tends to be high as less number of the wiring  60  connected to the upper face of the first light emitting element  20 A. However, there is no significant difference in the change rate of Vf to the temperature change (inclination of each line in  FIG. 16B ). Reducing the number of the wirings  60  can achieve not only lowering the manufacturing cost but also shortening the manufacturing time, to thereby improving the productivity. The number of the wirings  60  connected to the upper face of the first light emitting element  20 A is preferably three to five from a viewpoint of taking a balance of relationship with Vf elevation. 
     As shown in  FIG. 16C , assuming the direction perpendicular to the light-emitting face in a top view, even when the same number of wirings  60  are disposed in the center region, right side or left side from the center region of the upper face, there is no significant difference between these arrangements. Whether any bias is found in broken emitters in  FIG. 15B  to  FIG. 15D  or not was confirmed by increasing input temperature, any bias or regularity was not found between the arrangements in the center region, right side or left side of from the center region of the upper face. In other words, even when the wirings  60  are disposed in either side from the center region of the upper face, there is no significant difference between input current flowing through the waveguide  22  closer to these wirings  60  and input current flowing through the waveguide  22  farther from these wirings  60 . 
     As shown in  FIG. 16D , Vf value is low when the wirings  60  are connected as shown in  FIG. 15A  or  FIG. 15F  as compared to the case shown in  FIG. 15E , even when the same number of wirings  60  are connected.  FIG. 15E  is different from  FIG. 15A  and  FIG. 15F  in that the wirings  60  are connected at the position closer to the light-emitting face with narrower intervals. In comparison between  FIG. 15A  in which the wirings  60  are connected at the position closer to the light-emitting face with wider interval and  FIG. 15F  in which the wirings  60  are connected at a position farther from the light-emitting face with the narrower intervals, a relation such as a distance from the light-emitting face, a distance between the plurality of wirings  60 , and a distance between the light-emitting face and the face opposite thereto is considered to effect on the temperature characteristics for Vf. 
     The light emitting device  3  shown in the drawings are illustrated as light emitting devices  20  each having two waveguides  22 , however, connection aspects of the wirings  60  described in the Second Embodiment can also be applied to a light emitting device  20  having three or more waveguides  22 . 
     In the upper face of the first light emitting element  20 A having two or more waveguides  22 , in a top view, the number of the wirings  60  whose connection position(s) is located in a region overlapping the waveguide  22  is zero in each waveguide  22 . Alternatively, in the case in which the number of the wirings  60  whose connection position is located in a region overlapping the waveguide  22  is one or more in at least one of the waveguide  22 , the number of the wirings is not the same. 
     For example, the connection position(s) of the wirings  60  connected on the upper face of the light emitting element  20  having two or more waveguides  22  is positioned in a middle region of trisection of the upper face divided by virtual lines parallel to a direction extending along the waveguides  22  in a top view. In addition, the number of the wirings  60  whose connection position(s) is positioned at both sides of the trisection of the upper face is zero. Alternatively, the number of the wirings  60  whose connection position(s) is positioned in at least one of both sides of the middle region in the trisection of the upper face is not the same. 
     In a viewpoint of not based on the conventional connection aspects, the number of the wirings  60  connected on the upper face of the light emitting element  20  having two or more waveguides  22  can be less than twice of the number of the waveguides  22 . In this case, a diameter (Φ diameter) of the wirings  60  can be 50 μm or more and 100 μm or less. The greater the diameter of the wiring  60  is, the more the input current to flow therethrough stably, therefore, the diameter is 50 μm or more. The diameter of the wiring  60  is preferably less than 100 μm or less to suppress that the connection shape of the wiring  60  on the upper face of the light emitting element  20  become excessively large. 
     In the light emitting element  20  having two or more waveguides  22 , a thickness of the electrode connected to the wiring  60  is 0.1 μm or more and 10 μm or less. The thickness of the electrode is preferably 0.3 μm or more and 0.5 μm or less. Ensuring sufficient electrode thickness can make the current to easily expand. For example, in a relation with the strength of the substrate, a semiconductor laser element containing GaAs-based semiconductor may have a thickness greater than a thickness of a semiconductor laser element containing GaN-based semiconductor. In the case in which the light emitting element  20  having two or more waveguides  22  is the GaAs-based semiconductor laser element, it can be said that the wiring connection aspects such as the present embodiment suite for it. 
     In the foregoing, certain embodiments of the present invention have been explained. The present invention, however, is not strictly limited to the embodiments and Variations disclosed. In other words, the present invention is implementable without limiting the outer shape or the structure of a light emitting device to any of those disclosed by the embodiments and Variations. Furthermore, it is not essential for the applicability of the present invention to include all of the constituent elements necessarily and fully. For example, in the event that a certain constituent element of a light emitting device disclosed by any of the embodiments is not disclosed in the claim scope, we claim the applicability of the invention disclosed in the claim scope by recognizing the design flexibility for a person of ordinary skill in the art for such a constituent element through the use of an alternative, an omission, a shape change, a change in the materials employed, or the like. 
     The light emitting device disclosed in any of the embodiments can be used in projectors, automotive headlights, head-mounted displays, lighting fixtures, displays, and the like.