Patent Publication Number: US-2022239060-A1

Title: Light emitting device and method of manufacturing light emitting device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 16/744,004, filed on Jan. 15, 2020, which is based upon and claims priority to Japanese Patent Application No. 2019-005520, filed on Jan. 16, 2019. The disclosures of these applications are hereby incorporated by reference in their entireties. 
    
    
     BACKGROUND 
     The present disclosure relates to light emitting devices and methods of manufacturing light emitting devices. 
     It is known to employ a light emitting device in which a light emitting element such as a LED element or a semiconductor laser element as a light source. In such a light emitting device, a light emitting element, a base portion on which the light emitting element is disposed, a lens member, and the like are packaged. (See, Japanese Patent Publication No. 2003-224323) 
     A light emitting device can include a light reflecting member used to extract light emitted from a light emitting element. There are several reasons for using a light reflecting member. For example, when the light emitting element is a semiconductor laser element, the light reflecting member may be used for the purpose of increasing the optical path length and improving the heat dissipation property. 
     SUMMARY 
     However, when a light reflecting member is disposed inside the package as described above, the size of the light emitting device is accordingly increased. Further, when the shape of the light reflecting member is complicated, productivity is affected. Size reduction and improvement of productivity can enhance usefulness and industrial availability of the light emitting device. Thus, there is a room for improvement in the arrangement or the shape of the light reflecting member. 
     According to one embodiment, a light emitting device includes: a semiconductor laser element, a base portion, and a light reflecting member. The base portion includes a bottom portion on which the semiconductor laser element is arranged. The substrate also includes a frame portion including a step and surrounding the semiconductor laser element. The light reflecting member is provided to reflect light from the semiconductor laser element. The light reflecting member is leaned against the step. 
     The present disclosure also provides a method of manufacturing a light emitting device. According to one embodiment, the manufacturing method includes: providing a base portion having a frame portion and bottom portion on which a semiconductor laser element is disposed, the frame portion including a step and surrounding the semiconductor laser element, providing a light reflecting member for the semiconductor laser element; and disposing the light reflecting member on the bottom portion of the base portion so as to leaning against the step of the frame portion. 
     Certain embodiments of the present disclosure can achieve size reduction of a light emitting device in which a light reflecting member is employed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective diagram of a light emitting device according to certain embodiment of the present disclosure. 
         FIG. 2  is a top plan view for illustrating the internal structure of the light emitting device in  FIG. 1 . 
         FIG. 3  is a cross-sectional diagram of the light emitting device taken along line in  FIG. 1 . 
         FIG. 4  is a schematic perspective diagram showing the internal structure of the light emitting device according to the embodiment of the present disclosure. 
         FIG. 5  is a schematic perspective diagram for illustrating the light emitting device of the present disclosure. 
         FIG. 6  is a schematic cross-sectional diagram for illustrating the features of the light emitting device of the present disclosure. 
         FIG. 7  is a schematic cross-sectional diagram for illustrating the features of a bonding agent disposed on a bottom portion of a base portion. 
         FIG. 8  is a schematic cross-sectional diagram for illustrating the features of a bonding agent disposed on a frame portion of the base portion. 
         FIG. 9  is a schematic cross-sectional diagram for illustrating the features of a light reflecting member prevented from being directly contacting a bottom portion due to the interposition of the bonding agent. 
         FIG. 10  is a schematic perspective diagram for illustrating the features of a light emitting device in which light reflecting members respectively correspond to semiconductor laser elements. 
         FIGS. 11A to 11C  are schematic cross-sectional diagrams for illustrating the features of a manufacturing method of the present disclosure. 
         FIGS. 12A to 12C  are schematic cross-sectional diagrams for illustrating the features of leaning a light reflecting member while maintaining a state in which the light reflecting member is separated upward from a bottom portion by disposing a bonding agent on the bottom portion. 
         FIGS. 13A to 13C  are schematic cross-sectional diagrams for illustrating the features of leaning a light reflecting member while maintaining a state in which the light reflecting member is separated upward from the bottom portion by disposing the bonding agent on a frame portion as well. 
         FIG. 14  is a schematic cross-sectional diagram for illustrating a modification with regard to the shape of the light reflecting member. 
         FIG. 15  is a schematic cross-sectional diagram for illustrating an aspect of a light reflecting member to be used as a target for comparison. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be illustrated with reference to the accompanying drawings. It is to be noted that the embodiments shown below are intended to demonstrate the technical ideas of the present invention, but are not intended to limit the scope of the present invention. In the descriptions below, the same term or reference numeral generally represents the same member or a similar member, and its detailed description will be omitted as appropriate. The sizes, positional relations and the like of members shown in the drawings may be exaggerated for clarified explanation of the present disclosure unless specifically stated otherwise. 
     The term “vertical direction” as used directly or indirectly herein corresponds to the vertical direction in  FIG. 3 . The “vertical direction” is defined by an upper side to a lower side assuming that the lens member  140  is positioned at the upper and the substrate  100  positioned a lower side. 
     The term “cross-sectional view” (or “cross-sectional diagram”) herein is based on an imaginary cross-section taken along the thickness of a semiconductor laser element or a light emitting device. From another point of view, a cross-section taken along a direction orthogonal to a package surface main surface on which the semiconductor laser element is arranged (specifically a main surface of a bottom portion of a package) corresponds to the “cross-sectional view” (or “cross-sectional diagram”). Further, the term “plan view” (or “top view”) corresponds to an illustration of an object seen from the top along the thickness of the light emitting device. 
     Light Emitting Device 
     First, the general configuration of a light emitting device of certain embodiment will be described with reference to  FIGS. 1 to 4 .  FIG. 1  is a schematic perspective diagram showing the appearance of a light emitting device  1  according to the embodiment.  FIG. 2  is a top plan for illustrating the internal structure of the light emitting device  1 .  FIG. 3  is an arrow-direction cross-sectional diagram taken along line in  FIG. 1 .  FIG. 4  is a perspective diagram showing the inner part of the light emitting device where upper portions such as a lens member  140  and a lid portion  120  are omitted. In  FIG. 2 , a lid portion  120 , an adhesion portion  130  and a lens member  140  are shown by dashed lines to show the internal structure, and portions that would be visible as seeing through the above-mentioned members are shown by solid lines. Further, for avoiding complication of the drawings, a wire  180  shown in  FIGS. 2 and 3  is omitted in  FIG. 4 . 
     The light emitting device  1  is a device in which light emitted from a semiconductor laser element  170  is reflected at a light reflecting surface of a light reflecting member  150 , and passes through the lens member  140  to exit to the outside of the light emitting device  1 . The number of semiconductor laser elements  170  is not limited to one, or can be two or more. In the light emitting device  1 , light emitted from a plurality of semiconductor laser elements  170  is reflected by the light reflecting member  150 , and extracted to the outside through the lens member  140 . The semiconductor laser elements  170  are provided on one or more sub-mounts  160 . As shown in  FIG. 2 , a plurality of sub-mounts  160  is arranged in such a manner that the respective semiconductor laser elements  170  emits light in the same direction. The light reflecting member  150  is disposed so as to correspond to the plurality of semiconductor laser elements  170 . 
     The light emitting device  1  can include not only a package for emitting light, but also a mounting substrate on which the package is mounted. The light emitting device  1  can be configured to include a mounting substrate, but the present disclosure is not limited thereto, and for example, the package alone can be configured as the light emitting device  1 . 
     The configuration of the light emitting device  1  will be described in more detail. The light emitting device  1  includes, for example, a substrate  100  as the mounting substrate, and constituent elements such as a base portion  110 , the lid portion  120 , the adhesion portion  130 , the lens member  140 , the light reflecting member  150 , the sub-mount  160 , the semiconductor laser element  170  and the wire  180  to form the package. In a closed space formed by bonding the base portion  110  and the lid portion  120  to each other, the light reflecting member  150 , and the sub-mount  160  on which the semiconductor laser element  170  is arranged are disposed. Further, the wire  180  is provided to electrically connect the semiconductor laser element  170  disposed on the base portion  110 . 
     Further, as shown in  FIG. 3 , the base portion  110  has the frame portion  111  and the bottom portion  118 . As can be seen from the shown configuration, the semiconductor laser elements  170  are provided on the bottom portion  118  of the base portion  110 , and the semiconductor laser elements  170  are surrounded by the frame portion  111  to form the package. 
     The semiconductor laser elements  170  are provided on the bottom portion  118  of the substrate  110 , and the wire  180  extends from the semiconductor laser element  170  to the frame portion  111  of the base portion  110 . As can be seen from  FIG. 3 , the frame portion  111  has a step  111 A. That is, the frame portion  111  of the substrate  110  is defined with a surface  111 A 1  on which the wire  180  is connected for electrical connection, and the surface  111 A 1  is involved in formation of the step  111 A. 
     The substrate  100  is bonded to at least one of the frame portion  111  and the bottom portion  118 . Further, the frame portion  111  is bonded to the lid portion  120  on a side opposite to a surface bonded to the substrate  100 . The step  111 A is formed above the lower surface bonded to the substrate  100  and below the upper surface bonded to the lid portion  120 . That is, the step  111 A is formed between the uppermost surface and the lowermost surface of the base portion  110 . Further, the lid portion  120  and the lens member  140  are bonded to each other with the adhesion portion  130  interposed therebetween. 
     The light emitting device will be described in detail below. The light emitting device has a base portion including a bottom portion on which one or more semiconductor laser elements are arranged, and a frame portion provided so as to surround the semiconductor laser element. The frame portion has the step  111 A formed by a lateral surface crossing the bottom portion and extending upward, and an upper surface crossing this lateral surface. As shown in  FIGS. 3 and 4 , the light reflecting member  150  is leaned against the step  111 A. 
     The step upper surface  111 A 1  of the step  111 A, against which the light reflecting member  150  is leaned, is a surface to which the semiconductor laser element  170  can be electrically connected (see  FIGS. 2 and 3 ). That is, in the step upper surface  111 A 1 , a region on which the light reflecting member  150  is leaned is different from a region to which wire  180  is bonded for electrically connection. In the light emitting device  1 , the step  111 A provided for electrical connection is directly extended and utilized for installation of the light reflecting member  150  as described above. By using the step  111 A for installation of the light reflecting member  150  in this way, the light reflecting member  150  can be positioned close to the frame portion  111 , so that the light emitting device can be made compact. 
     According to the aspect of “leaning against object”, the leaning angle of the light reflecting member can be flexibly determined. For example, in the case of a light reflecting member  300  as shown in  FIG. 15 , it is necessary to manufacture several light reflecting members  300  each having different inclination angle to achieve the light reflection surfaces each having different inclination angles. On the other hand, in the case of the light reflecting member  150  of the embodiment, the same light reflecting member  150  can be used by adjusting the position at which the light reflecting member is leaned. 
     In an aspect, the light reflecting member has a flat plate shape. That is, as shown in  FIGS. 5 and 6 , the light reflecting member  150  has a plate-like flat shape as a whole. The light reflecting member  150  having a flat plate shape can be suitably leaned against the step of the frame portion  111 . 
     A flat plate-shaped light reflecting member has a relatively simple shape, and is therefore easier to manufacture. The light reflecting member can be relatively easily obtained by cutting a large flat plate mirror. As compared to the light reflecting member  300  that is not leaned (see  FIG. 15 ), the flat plate-shaped light reflecting member  150  has a smaller thickness and volume, so that material costs for the light reflecting member can be reduced. This is particularly desirable for mass production of light emitting devices, and contributes to production of light emitting devices at low costs. Therefore, productivity of light emitting devices can be improved. Further, a thin flat plate-shaped light reflecting member can contribute to weight reduction of the light emitting device. Therefore, use of a flat plate-shaped light reflecting member is advantageous in achieving size and weight reduction of the light emitting device. 
     The term “flat plate shape” herein means a flat shape in terms of an overall appearance in a broad sense, and means a shape in which the width dimension (one of mutually orthogonal width dimensions and/or the other width dimension) is larger than the thickness dimension by a significant degree in a narrow sense. The significant degree means, for example, satisfying the requirement that one of mutually orthogonal width dimensions and/or the other width dimension on a main surface of the light reflecting member be not less than 5 times the thickness dimension of the light reflecting member. Further, the significant degree means, for example, satisfying the requirement that the area of a plane formed by two width dimensions be not less than 5 times the area of a plane formed by one of the width dimensions and the thickness dimension. Further, the flat plate shape includes a realistic shape that can be considered to be a plate shape by those skilled in the art. The term “flat plate” as used in the flat plate shape here is flexibly interpreted, and the flat plate concept includes shapes obtained by subjecting corners of a flat plate to processing such as angle rounding, chamfering, angle cutting or round cutting. Further, the planar shape of the “flat plate” in a transverse direction is not limited to a rectangular shape as shown in the drawings, and may be a polygonal shape, and similarly, the “flat plate” concept includes shapes obtained by subjecting certain corners of a polygon to processing such as angle rounding. 
     The material and the configuration of the light reflecting member will be described in detail. The light reflecting member receives light emitted from the semiconductor laser element. Thus it is desirable that a material having high resistance to heat be used as a main material, and a material having a high reflectivity be used for the light reflecting surface. As the main material, glass such as quarts or BK  7  (i.e., borosilicate glass), a metal such as aluminum, Si or the like can be employed. A metal and/or a dielectric multilayer film or the like can be employed as the light reflecting surface. 
     In the light emitting device  1 , a main surface of the light reflecting member  150  leaned serves as a bonded surface  155  with the base portion  110  as shown in  FIG. 5 . Specifically, in a flat plate-shaped light reflecting member, one of two opposed surfaces serves as the bonding surface  155  with the frame portion  111  and the bottom portion  118  of the base portion  110 . In the light emitting device  1 , an end portion  157  of the bonding surface  155  of the light reflecting member  150  is disposed at a side close to the bottom portion  118 , and the light reflecting member  150  is leaned against an end portion (i.e., edge portion) of the step  111 A at a position other than the end portion  157  of the bonding surface  155 . 
     In certain aspect of the light emitting device, a region of the frame portion, which contacts the light reflecting member, is only an edge portion of the step. The term “contact” here indicates that the frame portion substantially contacts the light reflecting member. The term “substantially contact” can include a state that the frame portion and the light reflecting member are bonded so as to be adjacent to each other with a bonding agent or the like interposed therebetween. For example, when in bonding of two members, a force such as a gravity force is applied from one member to the other, the members substantially contact each other even when a bonding agent is interposed therebetween. On the other hand, for example, when one of two members is intentionally separated upward from the other member, so that a force such as a gravity force is not applied from one to the other, the two members do not substantially contact each other even when the two members are bonded with a bonding agent interposed therebetween. As can be seen from  FIGS. 3 to 5 , the light reflecting member  150  may be leaned against the step  111 A of the frame portion  111  in such a manner that only an angulated edge portion (particularly, an edge portion angulated toward the inside of the light emitting device) contacts the light reflecting member  150  at the step  111 A of the frame portion  111 . In other words, the light emitting device has a structure in which the light reflecting member  150  is leaned at an end portion of the step upper surface  111 A 1  of the frame portion  111 . The edge portion of the frame portion  111  that contacts the light reflecting member  150  has an angulated shape from the standpoint of appearance, and may be rounded due to the accuracy limit in manufacturing, or chamfered due to polishing for stability of shape and strength, or the like. 
     In certain aspect in which in the frame portion, only the edge portion of the step contacts the light reflecting member, it is easy to lean the light reflecting member at a desired leaning angle. That is, at the time of disposing the light reflecting member, influences of the shape of the frame portion, and the like are small (without excessively depending on the shape of the frame portion), and adjustment can be made so as to obtain a desired leaning angle. Thus, desired reflection of light (direction of reflected light) by the light reflecting member can be more easily achieved. 
     In certain embodiment, the edge portion of the step  111 A is formed such that in cross-sectional view of the frame portion  111 , the contour of the step  111 A forms a right angle. More specifically, in cross-sectional view, the lateral surface and the upper surface of the frame portion  111 , which form the edge portion, cross each other at right angle. The term “right angle” here is not limited to the exact right angle (90°), and allows for the range of 90°±1°. 
     In a “leaning” structure as in the light emitting device  1 , the angle of the edge formed by the upper surface and the lateral surface of the step is smaller than the angle formed by the upper surface and the bonding surface of the light reflecting member. Describing with reference to the cross-sectional diagram of  FIG. 6 , where the angle of the edge formed by the step upper surface  111 A 1  and a step lateral surface  111 A 2  is an “angle A”, and the angle formed by the step upper surface  111 A 1  and the bonding surface  155  of the light reflecting member  150  is an “angle α”, the angle A and the angle α satisfy the relationship of A&lt;α. 
     As can be seen from the above description and  FIG. 6 , the “angle of the edge formed by the upper surface and the lateral surface of the step herein means an angle of the edge formed by the upper surface and the lateral surface of the step, the angle being at the frame portion side. That is, when the angle of the edge portion formed by the upper surface and the lateral surface of the step can be broadly interpreted as that the angle may be not only the angle “A” but also the angle “360-A”, but herein, the angle refers to the angle A. The phrase “angle formed by the upper surface (i.e., the upper surface forming the edge portion of the step) and the bonding surface of the light reflecting member” means an angle formed by a region of the bonding surface of the light reflecting member, which is positioned below (i.e., bottom side from) the contact point between the light reflecting member and the frame portion, and the upper surface forming the edge portion of the step. As a simple description, the angle is an “angle formed by the upper surface and the bonding surface of the light reflecting member” as viewed in a direction extending along the same direction as the angle A toward the lateral surface with reference to the upper surface. 
     The features of the “leaning” structure will be described from another point of view. In the embodiment, the angle formed by the bottom portion  118  and the frame portion  111  is preferably larger than the angle formed by the bottom portion  118  and the bonding surface  155  of the light reflecting member  150 . As can be seen from  FIG. 6 , the angle formed by the bottom portion  118  and the frame portion  111  is preferably larger than 45° when the angle formed by the bottom portion  118  and the bonding surface  155  of the light reflecting member  150  is 45°. 
     In the light emitting device, the light reflecting member is bonded with a bonding agent in a state of being leaned. In certain aspect, the bottom portion  118  of the base portion  110  and the light reflecting member  150  are bonded with a bonding agent  190 A as shown in  FIG. 7 . Using the bonding agent can allow the light reflecting member to be more stably held or fixed in a desired leaning state. In another aspect, the frame portion  111  of the base portion  110  and the light reflecting member  150  are bonded with a bonding agent  190 B as shown in  FIG. 8 . Disposing the bonding agent also on the frame portion  111  can allow the light reflecting member to be further stably held and fixed. The bonding agent is not required to be provided along the entire length of the portion of the light reflecting member that is leaned on the edge portion of the step, but may be locally provided along the length of the light reflecting member. 
     The type of the bonding agent is not particularly limited. For example, the material of the bonding agent may be a resin-based material or a metal-based material. The resin-based bonding agent contains a resin as a main component, and similarly, the metal-based bonding agent contains a metal as a main component. 
     For the resin-based bonding agent, for example, an acryl-based bonding agent such as an acrylic ester copolymer, a silicone-based bonding agent such as silicone rubber, an epoxy resin-based bonding agent, or the like can be used. One bonding agent can be used solely, or two or more bonding agents can be used in combination. 
     The metal-based bonding agent contains metal particles. The material of the metal-based bonding agent can be, for example, a sintered material of metal. Such a sintered material of metal can be obtained by sintering or firing a metal paste containing metal particles, a binder resin and/or an organic solvent, and the like. The “metal” in the metal-based bonding agent refers to one that is normally recognized as a metal to those skilled in the art, and may be, for example, at least one selected from the group consisting of copper, aluminum, gold, silver, tungsten, iron, nickel and the like, or an alloy thereof. As a mere example, the metal particles in the sintered material of metal may be metal nanoparticles such as Au nanoparticles. Such a metal-based bonding agent has favorable heat resistance. Thus, even when the light reflecting member is subjected to temperature elevation by light from the semiconductor laser element (i.e. laser light), so that heat is propagated to the bonding agent, the bonding agent is less likely to degrade. In use of light of high power such as laser light, the metal-based bonding agent is preferable because it is less likely to cause dust collection. Specifically, it is possible to exhibit an effect of suppressing a phenomenon in which high-energy laser light emitted from the semiconductor laser element and organic substances present in space react with each other to form compounds at a light emitting end surface. 
     The binder resin that can be contained in a metal paste to be used as a raw material for the metal-based bonding agent can be any thermoplastic resin and/or any thermosetting resin as long as it contributes to more sufficient contact between metal particles and shape retention. The organic solvent that can be contained in a metal paste to be used as a raw material for the metal-based bonding agent can be any organic solvent as long as it is volatilized in sintering or firing of the paste. As a mere example, as the organic solvent, methanol, ethanol, isopropanol or the like can be used. One organic solvent may be used solely, or a mixture of two or more of these solvents may be used. 
     In certain aspect of the light emitting device  1 , the bottom portion  118  of the base portion  110  and the light reflecting member  150  do not contact each other, and are bonded with the bonding material  190 A interposed therebetween (see  FIG. 9 ). More specifically, the light reflecting member  150  contacts the frame portion  111  of the base portion  110 , and is in a state of being separated upward from the bottom portion  118  of the base portion  110 , and the gap between the bottom portion  118  and the light reflecting member  150  is filled with the bonding agent  190 . Such an aspect is associated with a “process of leaning a light reflecting member,” described below, and related to leaning with higher accuracy. 
     The leaning angle is determined in such a manner that a light reflecting surface configured to reflect light from the semiconductor laser element  170  has a desired angle. In the example of the light emitting device  1 , the angle is, for example, 45°. That is, it is preferable to lean the light reflecting member in such a manner that the angle formed by the light reflecting surface of the light reflecting member and the bottom portion is 45°. This can ensure that light from the semiconductor laser element can be reflected in a desired direction, and extracted. For example, by the light reflecting member leaned in such a manner that the angle formed by the light reflecting surface of the light reflecting member and the bottom portion is 45°, light from the semiconductor laser element is reflected toward the lens member, and collimated by the lens member, and the light is emitted to the outside of the light emitting device. The extracted light is not limited to collimated light, and can be collected light or diffused light. 
     The “angle formed by the light reflecting surface of the light reflecting member and the bottom portion” herein refers to an angle formed by the light reflecting member and the bottom portion, and specifically, the angle means an angle β that is an acute angle, of the angles formed by the light reflecting surface  156  of the leaned light reflecting member  150  and the bottom portion  118  (refer to  FIG. 9 ). As a simple description, the angle β means an angle as viewed in a direction extending upward from the bottom portion  118 , of the angles formed by the light reflecting surface  156  of the leaned light reflecting member  150  and the bottom portion  118 . In the embodiment, the angle β formed by the light reflecting surface of the light reflecting member and the bottom portion is 45°, but does not excessively restrict to this value, and it is only necessary for light from the semiconductor laser element to travel toward the lens member as is desired. Therefore, the angle β is substantially 45° allowing for a mounting tolerance. The range of the mounting tolerance depends on component size tolerance, mounting accuracy and the like, and therefore cannot be defined without any exception, the mounting tolerance is, for example, within 5°. 
     Regarding the light reflecting member  150  according to the aspect shown in  FIG. 9 , the distance between the light reflecting member  150  and the bottom portion  118  is larger than the distance between the light reflecting member  150  and the frame portion  111 , and the gap between the bottom portion  118  and the light reflecting member  150  is filled with the bonding agent  190 . Specifically, where the shortest separation distance between the light reflecting member  150  and the frame portion  111  is L 1 , and the shortest separation distance between the light reflecting member  150  and the bottom portion  118  is L 2 , L 1  and L 2  satisfy the relationship of L 1 &lt;L 2 . In particular, because the light reflecting member  150  and the frame portion  111  contact each other, the shortest separation distance L 1  between the light reflecting member  150  and the frame portion  111  is “0”. The shortest separation distance L 2  between the light reflecting member  150  and the bottom portion  118  is not particularly limited, and is, for example, in the range of 5 μm to 100 μm. Alternatively, the shortest separation distance L 2  can be in the range of 10 μm to 80 μm, or in the range of 20 μm to 70 μm. Such a range of values indicates the degree of variation in value with a manufacturing method below. In other words, the light reflecting member  150  can be disposed in a state of being separated upward from the bottom portion  118  by about 5 μm to 100 μm (e.g. 10 μm to 80 μm or 20 μm to 70 μm). 
     In certain aspect, at least two semiconductor laser elements are provided, and one light reflecting member reflects light from the at least two semiconductor laser elements. In a specific aspect, as shown in  FIG. 4 , three semiconductor laser elements  170  are provided, and a single light reflecting member  150  is provided for three semiconductor laser elements  170 . In such a case, the colors of light emitted from three semiconductor laser elements  170  can respectively be three colors (e.g., RGB), or light from respective three semiconductor laser elements  170  can be blue or one or more colors other than blue. Four or more semiconductor laser elements can be arranged. 
     In another aspect, at least two semiconductor laser elements are provided, and a plurality of light reflecting members respectively reflects light from the at least two semiconductor laser elements. For example, as shown in  FIG. 10 , three semiconductor laser elements  170  are provided, and the light reflecting members  150  are individually provided for each of those three semiconductor laser elements  170 . In such a case, light from each of the at least two semiconductor laser elements can be individually reflected in a desired direction. In the shown configuration, all of the light reflecting members  150  have the same flat plate shape (i.e., flat mirror shape), but the present disclosure is not limited thereto. For example, a plurality of light reflecting members can include flat mirrors and curved mirrors. 
     As described above, in the light emitting device of the embodiment, the position on which the light reflecting member  150  is leaned is the step  111 A of the frame portion  111  of the base portion  110 , and the upper surface of the step can also be used for electrical connection of the semiconductor laser element. Thus, at least a part of the surface forming the step includes a metal layer for electrical connection between the semiconductor laser element and the substrate (e.g., a mounting substrate such as a wiring substrate). 
     It is not preferable that the wire  180  extending from the semiconductor laser element runs across the light reflecting member  150  because path of light reflected at the light reflecting member may be obstructed by the wire  180 . That is, it is not preferable that the wire  180  extending from the semiconductor laser element  170  runs across the light reflecting member  150  to be contributed to electrical connection to a region of the frame portion on the back side of the light reflecting member  150 . Therefore, such the region of the frame portion on the back side of the light reflecting member  150  is not required to be provided with a metal layer for electrical connection between the semiconductor laser element and the substrate (e.g., a mounting substrate such as a wiring substrate). In other words, the metal layer for electrical connection to the semiconductor laser element is provide on a region of the upper surface of the step of the frame portion, which crosses a lateral surface different from a lateral surface forming an edge portion against which the light reflecting member is leaned. 
     The light emitting device according to the present disclosure can be implemented in various aspects. These aspects will be described in detail below. 
     Aspect of Base Member Installation 
     This aspect is an aspect in which the light emitting device includes a substrate. In particular, the light emitting device of such an aspect additionally includes a substrate as a mounting substrate (e.g. a wiring substrate), and is bonded to a package. 
     The substrate  100  may include, for example, a heat dissipation portion  101 , an insulating portion  102  and a metal film  103  as shown in  FIG. 3 . The heat dissipation portion  101  is formed of a metal such as Cu. The insulating portion  102  is formed of an insulating material. The metal film  103  is formed of a metal such as Cu like the heat dissipation portion  101 . The metal film  103  may be formed of a metal different from that of the heat dissipation portion  101 . 
     The substrate  100  is bonded to the frame portion  111  and the bottom portion  118 . The frame portion  111  is bonded to the substrate  100  in such a manner that the metal film  103  of the substrate  100  and a metal layer on the back surface (hereinafter, also referred to as a “back surface metal layer”) of the frame portion  111  contact each other. For a bonding agent for bonding these members, solder can be used. 
     In the frame portion, such a back surface metal layer is preferably electrical connected to a metal layer on the upper surface (hereinafter, also referred to as a “upper surface metal layer”). For example, the back surface metal layer and the upper surface metal layer of the frame portion  111  are electrically connected to each other by an electrically conductive material extending through the inside of the frame portion (e.g. a via hole) or an electrically conductive material extending at a lateral surface of the frame portion. The upper surface metal layer is a portion where the wire  180  extending from the semiconductor laser element  170  is electrically connected, and therefore the surface metal layer can be electrically connected to the semiconductor laser element  170  and the substrate  100 . The metal layer provided on the step upper surface  111 A 1  of the light emitting device  1  corresponds to the “upper surface metal layer”. 
     Aspect Relating to Bottom Portion and Frame Portion 
     This aspect is an aspect relating to a configuration of the bottom portion and the frame portion of the base portion. In the light emitting device according to the present disclosure, the bottom portion and the frame portion may be formed of the same or similar materials, and may be integrated with each other. Alternatively, the bottom portion and the frame portion may be formed of materials different from each other, and may be provided as different members, and bonded together. 
     When the bottom portion  118  and the frame portion  111  are different members, description is made as an aspect in which the bottom portion  118  is formed of a metallic material, and the frame portion  111  is made of a ceramic material. For example, a metal such as Cu or Al can be used for the bottom portion  118 , and a ceramic such as alumina (Al 2 O 3 ) or AlN can be used for the frame portion  111 . In such a case, while strength and/or shape stability can be secured in the frame portion  111 , the bottom portion  118  can have a thermal conductivity higher than that of the frame portion  111 , so that the bottom portion  118  can dissipate heat well. That is, the semiconductor laser element  170  is installed on the bottom portion  118 , and therefore heat can be more effectively dissipated through the bottom portion  118  from the semiconductor laser element  170 . 
     The bottom portion  118  can have a rectangular or polygonal shape at a joined surface on which the substrate  100  is joined, and at a mounting surface on which the light reflecting member  150 , the sub-mount  160  and the semiconductor laser element  170  are arranged. Further, the thickness from the joined surface and the mounting surface can be uniform. The “rectangle” here is flexibly interpreted in the present disclosure, and includes shapes obtained by subjecting corners of a rectangle plate to processing such as angle rounding, chamfering, angle cutting or round cutting. Similarly, the “polygon” here is flexibly interpreted, and includes shapes obtained by subjecting one or more of corners of a polygon to processing such as angle rounding. Further, when the corners of a rectangle or a polygon are subjected to processing, the sides of the rectangle or the polygon are considered as sides including the processed parts. The joined surface to be of the bottom portion  118  joined to the substrate  100  can be considered as a bottom surface. 
     The frame portion  111  can have a back surface electrode layer at a bottom surface of a surface to be bonded to the substrate  100 . The back surface electrode layer includes, for example, a metal layer, and can be bonded to the metal film  103  of the substrate  100 . The frame portion  111  can have an upper surface electrode layer at a surface on a side opposite to the bottom surface. That is, a upper surface electrode layer  114  electrically connected to the semiconductor laser element  170  can be provided on the upper surface of the step portion. The upper surface electrode layer and the back surface electrode layer are electrically connected to each other through, for example, a via hole. Thus, electric power can be supplied to the semiconductor laser element  170  through the upper surface electrode layer, the back surface electrode layer and the metal film  103  of the substrate  100 . The frame portion  111  has a depression portion inside the back surface of the frame portion  111 , and the bottom portion  118  can be accommodated in the depression portion. 
     The step provided in the frame portion can be formed over all four sides inside the frame in a plan view (particularly in top view), but the present disclosure is not limited thereto. The step provided in the frame portion can be formed over only two sides or three sides inside the frame in a plan view (particularly in top view). That is, the step is not required to be provided over the entire periphery of the frame, and regions to be provided with the step can be appropriately adjusted according to the number of semiconductor laser elements  170  arranged in the light emitting device  1 , a combination in arrangement of a plurality of semiconductor laser elements  170 , the number and positions of light reflecting members  150 , and the like. For example, there are cases where it suffices that the step is provided along one side or two sides of the frame, and where the step is required to be provided over the entire periphery of the frame. The combination in arrangement of a plurality of semiconductor laser elements  170  as mentioned here refers to, for example, arrangement of a plurality of semiconductor laser elements having the same color and the same performance, or arrangement of semiconductor laser elements having different colors. 
     Bonding of the frame portion  111  and the bottom portion  118  can be performed, for example, by using silver brazing materials containing Ag as a main component and also containing Cu, but other metal brazing material can be used. The frame portion  111  is brought into a state in which the bottom surface to be bonded to the substrate  100  faces upward, silver brazing material is applied to the bonding surface, and the silver brazing material is melted by heating. In this state, the bottom portion  118  is set in the frame of the frame portion  111 . Then, the silver solder is cooled to bond the frame portion  111  and the bottom portion  118 . In this way, the base portion  110  having the frame portion  111  and the bottom portion  118  can be formed. 
     Aspect Relating to Semiconductor Laser Element and Peripheral Members Thereof 
     This aspect relates to the semiconductor laser element and peripheral members thereof. 
     In the light emitting device, the semiconductor laser element  170  is bonded to the sub-mount  160  provided on the bottom portion, and emits light from a lateral surface closer to the light reflecting member  150 . As the material of the sub-mount  160 , aluminum nitride or silicon carbide can be used. The sub-mount  160  can be provided with a metal film, and the semiconductor laser element  170  can be fixed to the sub-mount  160  with an electrically conductive layer of Au—Sn or the like. The semiconductor laser element  170  can be provided directly on the bottom portion  118  without providing the sub-mount  160 . 
     The laser light emitted from the semiconductor laser element  170  has a far field pattern (hereinafter, referred to as “FFP”) in which the length in a stacking direction of a plurality of semiconductor layers including an active layer is larger than the length in a direction perpendicular to the stacking direction on a surface parallel to the light emitting end surface. The FFP here is a shape of emitted light and or light intensity distribution of measured at a position some distance away from the light emitting end surface of the semiconductor laser element. 
     The light emitting device has one or more semiconductor laser elements  170 . As shown in  FIG. 10 , for example, three semiconductor laser elements  170  can be arranged. The number of semiconductor laser elements  170  arranged is not limited thereto, and may be 1 or more. The colors of light emitted by these semiconductor laser elements  170  can be the same, or different. For example, three semiconductor laser elements  170  of the light emitting device  1  can respectively be configured as a first semiconductor laser element that emits red light, a second semiconductor laser element that emits green light, and a third semiconductor laser element that emits blue light. 
     The peak emission wavelength of the red light is, for example, within the range of 605 nm to 750 nm. Examples of the semiconductor laser element that emits red light include semiconductor laser elements containing an InAlGaP-based semiconductor, a GaInP-based semiconductor, a GaAs-based semiconductor or an AlGaAs-based semiconductor. The peak emission wavelength of the green light is, for example, within the range of 495 nm to 570 nm. Examples of the semiconductor laser element that emits green laser light include semiconductor laser elements containing a nitride semiconductor. The peak emission wavelength of the blue light is, for example, within the range of 420 nm to 494 nm. Examples of the semiconductor laser element that emits blue laser light include semiconductor laser elements containing a nitride semiconductor. As the nitride semiconductor, for example, GaN, InGaN and AlGaN can be used. 
     A wire is connected to the semiconductor laser element  170 . For example, the wire is bonded to the upper surface electrode layer  114  of the frame portion  111  and the semiconductor laser element  170  to electrically connect the upper surface electrode layer  114  and the semiconductor laser element  170 . The upper surface electrode layer  114  can be electrically connected to the semiconductor laser element  170 , for example, by bonding one end of an Au wire to the semiconductor laser element  170  and bonding the other end of the Au wire to the upper surface electrode layer  114  using a wire bonding apparatus. A protective element  175  such as a Zener diode can be disposed on the sub-mount  160  (see  FIG. 4 ), and in this case, the protective element  175  can also be electrically connected by the wire. 
     Light emitted from the semiconductor laser element  170  is reflected at the light reflecting surface of the light reflecting member  150 , and passes through the lens member  140  to be extracted to the outside. The lens member  140  can have a lens shape in which a plurality of lens portions is connected as shown in  FIG. 1 . The lens member  140  can be designed in such a manner that one lens portion corresponds to one semiconductor laser element, and the lens portions transmit main parts of light emitted from respective semiconductor laser elements. As material of the lens member  140 , for example, glass such as BK7 or B270, or the like can be used. No lens member  140  may be present. 
     The lens member  140  can be bonded to the lid portion  120  using an adhesive. After the bonding, the adhesion portion  130  can be formed between the lid portion  120  and the lens member  140  (see  FIG. 3 ). Preferably, the adhesion portion  130  is not formed over the entire upper surface of the lid portion  120  or the entire lower surface of the lens member  140 , but provided at a position where the adhesion portion  130  does not obstruct the path of light emitted from the semiconductor laser element  170 . Specifically, in the light emitting device  1 , a main part of light emitted by the semiconductor laser element  170  enters into and exits from a region having a lens shape of the lens member  140 . Therefore, preferably, the adhesion portion  130  is not formed in a region of the lower surface of the lens member  140 , which directly under the region having a lens shape, but formed on an outer peripheral region of the lens member  140 . It is preferable to use an ultraviolet ray-curable resin is as an adhesive for forming the adhesion portion  130 . The ultraviolet ray-curable resin can be cured in a relatively short time without being heated, so that the lens member  140  is easily fixed at a desired position. 
     Method of Manufacturing Light Emitting Device 
     A method of manufacturing a light emitting device according to an embodiment will now be described with reference to  FIGS. 11 to 13 . 
     Specifically, the method of manufacturing a light emitting device according to the embodiment includes: providing a base portion  118  having a frame portion  111  having a step, the frame portion  111  being surrounding a semiconductor laser element  170 ; providing a light reflecting member  150  for reflecting light from the semiconductor laser element  170  disposed on or above the base portion  110 ; providing a light reflecting member  150  on a bottom portion  118  of the base portion  110  on which the semiconductor laser element  170  is disposed so as to leaning against the step of the frame portion  111 . 
     In the method of manufacturing a light emitting device, the base portion  110  is provided as shown in the drawings. The base portion  110  used in this step is provided on which the semiconductor laser element  170  is mounted. The base portion  110  used in this step does not have to be provided on which no semiconductor laser element  170  is mounted. That is, the semiconductor laser element  170  may be mounted after the light reflecting member  150  is bonded. Subsequently, a bonding agent  190  is provided in a predetermined region of the bottom portion  118  of the base portion  110 . The light reflecting member  150  is disposed so as to be leaned against the step  111 A of the frame portion  111  of the base portion  110 , and the light reflecting member  150  is fixed with the bonding agent  190  to bond the light reflecting member  150  to the base portion  110 . 
     The light reflecting member  150  to be leaned can have a flat plate shape. That is, the light reflecting member  150  can be a light reflecting member having a plate-like flat shape as a whole as described above. Such a light reflecting member is thin, and has a relatively small volume, so that it is easy to achieve reduction in size and weight of the light emitting device as described above. Such a relatively simple shape can easily be handled, can be moved in a state of being picked up, for example, by an adsorption unit such as a collet, and can contribute to suitable leaning. 
     In an aspect, the light reflecting member  150  is leaned in such a manner that only an edge portion of the step  111 A contacts the light reflecting member  150  at the time of bringing the light reflecting member  150  and the frame portion  111  into contact with each other (see  FIGS. 11 to 13 ). That is, the light reflecting member  150  may be leaned against the step  111 A of the frame portion  111  in such a manner that in the frame portion  111 , only an angulated edge portion (particularly, an edge portion angulated toward the inside of the light emitting device) contacts the light reflecting member  150 . In such an aspect, the leaning angle can be adjusted with respect to an edge portion of the step  111 A, which is a contact portion between the step  111 A and the light reflecting member  150 , so that it is easy to dispose the light reflecting member  150  at a desired leaning angle. The operation of leaning the light reflecting member  150  can be performed, for example, from above the frame portion  111  as shown in  FIGS. 11A to 11C . That is, the light reflecting member  150  is transferred downward from above the frame portion  111 , and brought into contact with the edge portion of the step  111 A of the frame portion  111  and the bottom portion  118 , so that the light reflecting member  150  is disposed in a state of being leaned. 
     The bonding agent  190  ( 190 A or  190 B) is used for leaning the light reflecting member  150  as shown in  FIGS. 11 to 13 . The light reflecting member  150  can be more stably maintained in a desired state by using the bonding agent  190 . For example, the light reflecting member  150  can be leaned with the bonding agent  190 A disposed on the bottom portion  118  of the base portion  110  and with no bonding agent on the step  111 A of the frame portion  111  as shown in  FIGS. 11A to 11C  and  FIGS. 12A to 12C . Preferably, the bonding agent  190 A provided on the bottom portion  118  is disposed on the main surface of the bottom portion  118 , specifically in a region between the sub-mount and the frame portion. The light reflecting member  150  can be leaned against the step  111 A of the frame portion  111  with the bonding agent  190 B disposed on the frame portion  111  of the base portion  110  instead of or in addition to disposing the bonding agent  190 A on the bottom portion  118  of the base portion  110  (see  FIGS. 13A to 13C ). The bonding agent  190 B provided on the frame portion  111  is disposed specifically on the step upper surface  111 A 1  of the frame portion  111 , preferably on or vicinity of the edge. For example, it is preferable that, between a side forming the edge and a side opposed to the side on the step upper surface  111 A 1 , the bonding agent  190 B is disposed on the edge side from the midpoint of the shortest distance between these two sides. Further, it is preferable that the bonding agent  190 B is not disposed in a region extending in a direction away from the edge through the midpoint. When the bonding area with the bonding agent  190 B is too large, stress from the frame portion  111  may increase, leading to deformation and delamination of the light reflecting member  150 . At the time of leaning the light reflecting member  150 , an absorption unit such as a collet  200  can be used as shown in the drawings. That is, a transfer tool utilizing vacuum action or decompression action can be used for the operation of leaning the light reflecting member. Although examples of specific types of the bonding agent have been described above, a bonding agent to be used for bonding the frame portion  111  and the lid portion  120  can be conveniently used. 
     Besides a method in which the light reflecting member is transferred downward from above, and brought into contact with the frame portion and the bottom portion as in  FIG. 11 , the light reflecting member  150  can be leaned in a state of being separated from the bottom portion  118  as shown in  FIGS. 12 and 13 . By separating the light reflecting member  150  from the bottom portion  118 , the light reflecting member  150  is disposed on the upper side as compared to the case where the light reflecting member  150  is brought into contact with the bottom portion  118 , but an angle in leaning can easily be maintained. For example, when the light reflecting member  150  is transferred downward to a predetermined position and brought into contact with the bottom portion  118  in such a manner that a constant distance is maintained between the light reflecting member  150  and the semiconductor laser element  170 , the angle of the light reflecting member  150  varies under the influence of component size tolerance and mounting tolerance in the bottom portion  118  and the frame portion  111 . Thus, with the influence of tolerance taken into account, the light reflecting member is leaned against the frame portion while the angle of the light reflecting surface is preliminarily maintained with a distance provided so that the light reflecting member  150  is not brought into contact with the bottom portion  118 . This can improve accuracy of angle of the light reflecting member  150 . The light reflecting member  150  and the bottom portion  118  can be bonded by filling the gap between the light reflecting member  150  and the bottom portion  118  with the bonding agent  190 A. 
     It is preferable to dispose the bonding agent on the base portion  110  prior to disposing the leaning light reflecting member  150  separated from the bottom portion  118  as described above. This can facilitate stable placement of the light reflecting member at a desired leaning angle. For example, placement of the leaning light reflecting member  150  can be performed by pressing the light reflecting member  150  against the bonding agent  190 A disposed on the bottom portion  118  while maintaining a state in which the light reflecting member  150  is separated from the bottom portion  118  as shown in  FIGS. 12A to 12C . The bonding agent  190 B can preliminarily be disposed on the frame portion  111 . In such a case, the light reflecting member  150  can be disposed by pressing the light reflecting member  150  against the bonding agent  190 B disposed on the frame portion  111  while maintaining a state in which the light reflecting member  150  is separated from the bottom portion  118  (see  FIGS. 13A to 13C ). The collet  200  can be used for maintaining a state in which the light reflecting member  150  is separated from the bottom portion  118  as shown in  FIGS. 12 and 13 . As can be seen from the drawing, use of the collet  200  can facilitate the light reflecting member  150  to preliminarily be inclined at a leaning-on angle or an angle close to the leaning-on angle, and the light reflecting member  150  can be proceeded to a bonding step in this state. 
     When the bonding agent is preliminarily disposed, the light reflecting member is pressed against the bonding agent while moving, and therefore the bonding agent tends to finally have a shape, for example, an extended shape or squashed shape in a predetermined direction. When the light reflecting member is moved in a horizontal direction for placement as shown in  FIGS. 12 and 13 , the bonding agents  190 A and  190 B tend to respectively have a shape in which the end portion is stretched or squashed outward (i.e., toward the frame portion). Such a shape can lead to an increase in area of the bonding surface between the light reflecting member and the bonding agent, so that it is possible to contribute to stable fixation of the leaned light reflecting member. 
     It is preferable to lean the light reflecting member in such a manner that the angle formed by the light reflecting surface of the light reflecting member and the bottom portion is 45° as described above. This means that the angle formed by the light reflecting surface of the light reflecting member and the bottom portion is preferably 45° in the finally-obtained light emitting device. In this connection, the light reflecting member can be leaned, for example, with consideration of a time-dependent change of the bonding agent. When for example, a sintering agent is used as the bonding agent, the amount of volumetric shrinkage of the bonding agent, which is associated with the sintering treatment of the bonding agent, can preliminarily be taken into account. In this case, for example, the leaning light reflecting member is disposed by pressing the light reflecting member against a metal paste containing a metal particles and a binder resin and/or an organic solvent or the like. Such a metal paste is subjected to sintering after placement of the light reflecting member, but in the sintering treatment of the metal paste, the leaning angle of the light reflecting member may be changed due to a change such as volumetric shrinkage of the metal paste. Thus, the light reflecting member can preliminarily be leaned against the bonding agent before sintering with the amount of the volumetric shrinkage taken into account. 
     In the manufacturing method of the embodiment, the light reflecting member  150  is leaned, and the object against which the light reflecting member is leaned is preferably a step of the “frame portion of the base portion”, which contributed to electrical connection of the semiconductor laser element. The step  111 A (particularly the step upper surface) of the frame portion  111  has an upper surface metal layer  114  for electrical connection to the semiconductor laser element  170 , and the light reflecting member  150  can be leaned against the step  111 A of the frame portion  111  including such an upper surface metal layer  114  (see  FIG. 4 ). 
     It is not required to dispose a metal layer in a region of the frame portion against which the light reflecting member  150  is leaned. This is because when a metal layer is provided in such a region, and a wire  180  extending from the semiconductor laser element is connected to the metal layer, light reflected at the light reflecting member may be obstructed by the wire  180 . When a metal paste is used as the bonding agent, it is preferable to use a metal material such as a metal layer for the frame portion from the viewpoint of contact between the bonding agent and the frame portion. Therefore, the “metal layer that is not required to be provided in a region of the frame portion against which the light reflecting member is leaned” refers to a metal layer that contributes to electrical connection between the semiconductor laser element and the substrate (particularly, a metal layer associated directly with an extending structure in which a wire for such connection runs across the light reflecting member). 
     For this reason, a part of step upper surface of the frame portion  111 , which forms an edge portion, is provided with the metal layer  114  for electrical connection of the semiconductor laser element  170 . Also in the manufacturing method of the embodiment, it is preferable to lean the light reflecting member  150  against the step  111 A having an upper surface region  111 A 1a  different from the region of the step upper surface provided with the metal layer  114  (see  FIGS. 4 and 10 ). The edge portion against which the light reflecting member  150  is leaned, in other words, the contact region with the light reflecting member  150  is an insulating region. 
     More detailed descriptions or other descriptions such as further specific aspects of the manufacturing method of the embodiment are not described because they have been described in the section “Light emitting device” above. 
     Light emitting devices according to embodiments have been described above, but they are merely shown as typical examples. Therefore, the light emitting devices for implementing the technical ideas of the embodiments are not limited to these examples, and various aspects are conceivable. 
     For example, in the aspects described above, all the edges of the flat-plate light reflecting member are angulated, but the embodiments are not limited thereto. For example, the edge  158  of the bonding surface of the light reflecting member  150  can be chamfered as shown in  FIG. 14 . In such a case, the light reflecting member  150  can be leaned in such a manner that the planar region after chamfering the edge contacts the bottom portion  118  of the base portion  110 . Chamfering the edges  158  at both ends can facilitate mounting the light reflecting member because the mounting can be performed regardless of which chamfered region is positioned on a side close to the bottom portion  118 . 
     Further, in the drawings referred to in the above description, the end portion of the leaned light reflecting member on the lower side is separated from the sub-mount, but the embodiments are not limited thereto. The light reflecting member can be leaned against the step of the frame portion in such a manner that the end portion of the leaned light reflecting member on the lower side contacts the sub-mount. 
     Finally, it should be noted, additionally, that the light emitting device and the manufacturing method having the technical features disclosed in the present disclosure are not limited to the above-described structures and manufacturing steps. For example, the present disclosure is applicable even to a light emitting device having a constituent element that is not present in the above-described light emitting device, and it cannot be said that the present disclosure is not applicable to a light emitting device because there is a difference between the light emitting device and the disclosed light emitting device. On the other hand, a light emitting device to which the present disclosure is applicable is not absolutely required to necessarily and sufficiently include all the constituent elements of the above-described light emitting device. For example, if some of the constituent elements of the above-described light emitting device are not described in claims, it is recognized that those constituent elements are not limited to those disclosed above, and are based on the degree of freedom of design by those skilled in the art, such as substitution, omission, shape modification and change of materials, and it is then claimed that inventions described in claims are applied. 
     The light emitting device according to the present disclosure can be used for projectors, vehicle headlights, illuminations, displays and the like.