Light-emitting device

Abstract

To provide a light-emitting device in which complication of a substrate shape is avoided and safety is ensured.SOLUTION: A light-emitting device includes: a package including a base part, a frame part including a plurality of inner side surfaces, and a lid part; a light-emitting element disposed on an upper surface of the base part and emitting light; and a light incidence body to which light is incident. The lid part includes a lower surface. In a top view, the plurality of inner side surfaces include a first inner side surface and a second inner side surface facing each other in a direction perpendicular to an optical axis direction of light. The light-emitting element is disposed in a first arrangement region. In the direction perpendicular to the optical axis direction of light, a length of the light incidence body is longer than a length between the first inner side surface and the second inner side surface. About a height from the upper surface of the base part in a direction perpendicular to the upper surface of the base part, the upper surface of the light incidence body is higher than the upper surface of the light-emitting element, and a lower surface of the light incidence body is lower than a lower surface of the light-emitting element. The length of the light incidence body is longer than a length from the upper surface of the light-emitting element to the lower surface of the lid part. The light incidence body includes a first side surface and a second side surface, and a first counter surface facing the second side surface and having a space from the second side surface.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] This disclosure relates to a light-emitting device.

Background Art

[0002] In a light-emitting device including laser light, safety may be required in view of using the laser light. Patent Document 1 discloses a light-emitting device having a laser diode as a light-emitting element, in which light emitted from the laser diode is incident on a wavelength converter, and the light incident on the wavelength converter is converted into light of a different wavelength and emitted to the outside. In the light-emitting device disclosed in Patent Document 1, a concave fitting portion for fixing the wavelength converter is provided on the substrate, and the wavelength converter is fixed by fitting it into the fitting portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since Patent Document 1 provides a fitting portion adapted to the wavelength converter, the shape of the substrate becomes complicated, and it is required to form the wavelength converter and the substrate with high manufacturing accuracy. Therefore, an object is to avoid such complication of the substrate shape adapted to the shape of the wavelength converter and to realize a light-emitting device that also takes safety into consideration.

Means for Solving the Problems

[0005] A light-emitting device according to one embodiment of the present disclosure comprises a package having a base, a frame having a plurality of inner surfaces, and a lid; a light-emitting element disposed on the upper surface of the base, surrounded by the frame, and emitting directional light that travels laterally; and a light-inciting body disposed on the upper surface of the base, surrounded by the frame, and positioned to the side of the light-emitting element, into which the light is incident, wherein at least a portion of the lid has a lower surface located above the light-inciting body and the light-emitting element, and in a top view, in a second direction perpendicular to a first direction which is the optical axis direction of the light, the plurality of inner surfaces include opposing first inner surfaces and second inner surfaces, and the light-emitting element is disposed in a first arrangement region located between the first inner surface and the second inner surface. Furthermore, in the second direction, the length of the light incident body is longer than the length between the first inner surface and the second inner surface; in the third direction perpendicular to the upper surface of the base, the height of the upper surface of the light incident body from the upper surface of the base is higher than the height of the upper surface of the light-emitting element from the upper surface of the base, and the height of the light incident body from the upper surface of the base is lower than the height of the lower surface of the light-emitting element from the upper surface of the base; the length of the light incident body is longer than the length from the upper surface of the light-emitting element to the lower surface of the lid; the light incident body has a first surface facing the light-emitting element and a second surface located on the opposite side of the first surface, and a first opposing surface facing the second surface and having a space between it and the second surface. [Effects of the Invention]

[0006] According to one embodiment of this disclosure, a light-emitting device that takes safety into consideration can be realized. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view illustrating the light-emitting device according to the first and second embodiments. [Figure 2] This is a perspective view illustrating the internal structure of the light-emitting device according to the first embodiment. [Figure 3] This is a top view illustrating the internal structure of the light-emitting device according to the first embodiment. [Figure 4]This is a cross-sectional view taken along line IV-IV in Figure 3, illustrating a light-emitting device according to the first embodiment. [Figure 5] This is a top view illustrating the base and frame. [Figure 6] This is a cross-sectional view taken along the line VI-VI in Figure 5, illustrating the base and frame. [Figure 7] Figure 3 is a top view of the light incident object. [Figure 8] Figure 7 is a cross-sectional view of the light incident object along line VIII-VIII. [Figure 9] This is a perspective view showing an example of a light-injecting section. [Figure 10] This is a top view corresponding to Figure 3, which further describes the light incident element and light-emitting element of the light-emitting device according to the first embodiment. [Figure 11] This is a cross-sectional view corresponding to Figure 4, which provides a more detailed explanation of the light incident element and light-emitting element of the light-emitting device according to the first embodiment. [Figure 12] This is a top view illustrating the internal structure of the light-emitting device according to the second embodiment. [Figure 13] This is a cross-sectional view taken along line XIII-XIII in Figure 12, illustrating a light-emitting device according to the second embodiment. [Figure 14] This is a top view illustrating the internal structure of another example of a light-emitting device according to the second embodiment. [Modes for carrying out the invention]

[0008] The embodiments for carrying out the invention will be described below with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "up," "down," and other terms including these terms) will be used as needed. However, the terms indicating directions or positions such as "up" and "down" used in this specification are used to clarify the relative directions and positional relationships of each component and member, and do not necessarily correspond to the relationships in actual use. Also, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or members.

[0009] Furthermore, in this disclosure, the term "polygon" refers to polygons such as triangles and quadrilaterals, including shapes where the corners of the polygon have been rounded, chamfered, or otherwise modified. Similarly, shapes where modifications have been made not only to the corners (ends of the sides) but also to the middle parts of the sides will also be referred to as polygons. In other words, shapes that retain the shape of a polygon but have been partially modified are included in the interpretation of "polygon" as described in this disclosure.

[0010] Furthermore, the same applies not only to polygons, but also to words describing specific shapes such as trapezoids, circles, and concave shapes. The same also applies when dealing with each side that forms such a shape. In other words, even if a side has been processed at a corner or in the middle, the interpretation of "side" includes the processed part. When distinguishing a "polygon" or "side" without partial processing from a processed shape, the term "strictly" should be added, for example, "strictly quadrilateral."

[0011] Furthermore, the embodiments described below are illustrative examples of light-emitting devices and the like that embody the technical concept of the present invention, and do not limit the present invention to the following. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are intended to be illustrative, and not to limit the scope of the present invention unless otherwise specified. In addition, the content described in one embodiment is applicable to other embodiments and modifications. Furthermore, the size and positional relationships of the members shown in the drawings may be exaggerated to clarify the explanation. In addition, in order to avoid the drawings becoming excessively complex, schematic diagrams that omit the illustration of some elements may be used, or end view diagrams that show only the cross-section may be used as cross-sectional views.

[0012] [First Embodiment] Referring to FIGS. 1 to 11, the light-emitting device 200 according to the first embodiment will be described. FIG. 1 is a perspective view illustrating the light-emitting device 200. FIG. 2 is a perspective view for explaining the internal structure of the light-emitting device 200. For convenience of explanation, the wiring 270 shown in FIG. 3 is omitted in FIG. 2. FIG. 3 is a top view for explaining the internal structure of the light-emitting device 200. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1, illustrating the light-emitting device 200. FIG. 5 is a top view for explaining the base 211 and the frame portion 212. FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, for explaining the base 211 and the frame portion 212. FIG. 7 is a top view of the light-incident body 240 shown in FIG. 3. FIG. 8 is a cross-sectional view of the light-incident body 240 taken along line VIII-VIII of FIG. 7. FIG. 9 is a perspective view showing an example of the light-incident portion 241. FIG. 10 is a top view corresponding to FIG. 3 for explaining the light-incident body 240 and the light-emitting element 220 of the light-emitting device 200 in more detail. FIG. 11 is a cross-sectional view corresponding to FIG. 4 for explaining the light-incident body 240 and the light-emitting element 220 of the light-emitting device 200 in more detail.

[0013] The light-emitting device 200 includes a package 210, a light-emitting element 220, and a light-incident body 240. In the illustrated example, it further includes submounts 230 and 235, a protective element 250, and wiring 270. Note that these components are not essential.

[0014] Each component of the light-emitting device 200 will be described.

[0015] In FIGS. 1 to 8, FIG. 10, and FIG. 11, for reference, X-axis, Y-axis, and Z-axis orthogonal to each other are shown. The directions parallel to the X-axis, Y-axis, and Z-axis are defined as the first direction X, the second direction Y, and the third direction Z, respectively. The first direction X and the second direction Y are parallel to the upper surface 211a of the base 211, and the third direction Z is perpendicular to the upper surface 211a of the base 211.

[0016] (Package 210) Package 210 comprises a base portion 211, a frame portion 212, and a lid portion 213. The base portion 211 has an upper surface 211a and a lower surface 211b. The base portion 211 has a rectangular shape when viewed from above. This rectangle may have a long side and a short side. However, the shape of the base portion 211 when viewed from above does not have to be rectangular. Unless otherwise specified, a square may be included in the definition of a rectangle.

[0017] The frame portion 212 connects to the upper surface 211a of the base portion 211 and extends upward above the upper surface 211a. The frame portion 212 has one or more upper surfaces, a first lower surface 212b, multiple inner surfaces, and one or more outer surfaces 212i. One or more upper surfaces of the frame portion 212 have a first upper surface 212a that intersects with one or more outer surfaces 212i. The outer edge shape of the first upper surface 212a is, for example, rectangular. The inner edge shape of the first upper surface 212a is, for example, rectangular. The multiple inner surfaces of the frame portion 212 intersect with the upper surface 211a of the base portion 211.

[0018] The base portion 211 and the frame portion 212 form a concave shape that extends from the first upper surface 212a of the frame portion 212 toward the upper surface 211a of the base portion 211. The concave shape is formed on the inside of the outer shape of the frame portion 212 when viewed from above. When viewed from above, the upper surface 211a of the base portion 211 is surrounded by a frame formed by the multiple inner surfaces of the frame portion 212. The outer shape of this frame is a rectangle with long and short sides. The base portion 211 and the frame portion 212 are formed separately and then joined together. However, the base portion 211 and the frame portion 212 may be formed integrally.

[0019] In package 210, a stepped shape is formed on the inside of the frame portion 212. Specifically, the frame portion 212 has a first stepped shape 214 and / or a second stepped shape 215 when viewed from above. In the examples of Figures 3, 5, and 6, the frame portion 212 has a second upper surface 214a and a third upper surface 215a along the two sides of the inner edge shape of the first upper surface 212a that extend in the first direction X. When viewed from above, the second upper surface 214a is provided along one side of the first upper surface 212a that extends in the X direction. When viewed from above, the third upper surface 215a is provided along the other side of the first upper surface 212a that extends in the X direction. In the frame portion 212, the second upper surface 214a and the third upper surface 215a are not provided along the entire length of the side that extends in the first direction X. The second upper surface 214a and the third upper surface 215a are provided along only a portion of each of the two sides extending in the first direction X, and in the illustrated example, both are provided on the negative side in the first direction X.

[0020] The frame portion 212 further has one or more inner surfaces that intersect with the second upper surface 214a and extend downward. One or more inner surfaces include a first inner surface 212c that intersects with the second upper surface 214a. The first inner surface 212c intersects with the upper surface 211a of the base portion 211. In the illustrated example, the multiple edges where the first inner surface 212c and the second upper surface 214a intersect include, in a top view, edges extending in a first direction X and edges extending in a second direction Y. There are further curves between the edges extending in the first direction X and the edges extending in the second direction Y. Similarly, the edges where the first inner surface 212c and the upper surface 211a of the base portion 211 intersect include, in a top view, edges extending in a first direction X and edges extending in a second direction Y. A curve is further present between the edge extending in the first direction X and the edge extending in the second direction Y. Also, the first inner surface 212c does not intersect the first upper surface 212a.

[0021] The frame portion 212 has one or more inner surfaces that intersect with the third upper surface 215a and extend downward. The one or more inner surfaces include a second inner surface 212d that intersects with the third upper surface 215a. The second inner surface 212d intersects with the upper surface 211a of the base portion 211. In the illustrated example, the multiple edges where the second inner surface 212d and the third upper surface 215a intersect include, in a top view, edges extending in a first direction X and edges extending in a second direction Y. There are further curves between the edges extending in the first direction X and the edges extending in the second direction Y. Similarly, the edges where the second inner surface 212d and the upper surface 211a of the base portion 211 intersect include, in a top view, edges extending in a first direction X and edges extending in a second direction Y. A curve is further present between the edge extending in the first direction X and the edge extending in the second direction Y. Also, the second inner surface 212d does not intersect with the first upper surface 212a. Note that if the frame portion 212 has only the first stepped shape 214 and not the second stepped shape 215, the second inner surface 212d connects the first upper surface 212a and the upper surface 211a of the base portion 211. In that case, the frame portion 212 does not have the fourth inner surface 212f, which will be described later.

[0022] The second upper surface 214a and the third upper surface 215a are located inward from the inner edge of the first upper surface 212a when viewed from above. In the illustrated example, the second upper surface 214a and the third upper surface 215a are located above the upper surface 211a of the base portion 211 and below the first upper surface 212a of the frame portion 212. Also, the second upper surface 214a and the third upper surface 215a are parallel to the upper surface 211a of the base portion 211, for example. The second upper surface 214a and the third upper surface 215a may be at the same height as the first upper surface 212a. The first inner surface 212c and the second inner surface 212d each have portions that face each other in the second direction Y. The opposing portions of the first inner surface 212c and the second inner surface 212d intersect with the edge of the second upper surface 214a extending in the first direction X and the edge of the third upper surface 215a extending in the first direction X, respectively.

[0023] Furthermore, Figures 3, 5, and 6 will be used to describe the multiple inner surfaces of the frame portion 212. The multiple inner surfaces of the frame portion 212 may further include a third inner surface 212e and a fourth inner surface 212f that are opposite each other in the second direction Y. The third inner surface 212e is a surface that intersects with one side of the first upper surface 212a extending in the first direction X and extends downward. The third inner surface 212e intersects with the upper surface 211a of the base portion 211. Furthermore, it intersects with the second upper surface 214a. Similarly, the fourth inner surface 212f is a surface that intersects with the other side of the first upper surface 212a extending in the first direction X and extends downward. The fourth inner surface 212f intersects with the upper surface 211a of the base portion. Furthermore, it intersects with the third upper surface 215a. Furthermore, if the second upper surface 214a and the third upper surface 215a are at the same height as the first upper surface 212a, the third inner surface 212e intersects the second upper surface 214a and the first upper surface 212a at a point on one of the edges extending in the X direction. Similarly, the fourth inner surface 212f intersects the third upper surface 215a and the other edge extending in the X direction on the first upper surface 212a at a point.

[0024] The third inner surface 212e and the fourth inner surface 212f face each other in the second direction Y. For two sides extending in the first direction X, the first inner surface 212c and the third inner surface 212e are located on one side of the side. The second inner surface 212d and the fourth inner surface 212f are located on the other side of the side.

[0025] The multiple inner surfaces of the frame portion 212 further include a fifth inner surface 212g connecting the third inner surface 212e and the fourth inner surface 212f, and a sixth inner surface 212h facing the fifth inner surface 212g in the first direction X. The fifth inner surface 212g is a surface that intersects with the first upper surface 212a and extends downward. The fifth inner surface 212g intersects with the upper surface 211a of the base portion 211. The fifth inner surface 212g does not intersect with the first inner surface 212c and the second inner surface 212d. The sixth inner surface 212h is a surface that intersects with the first upper surface 212a and extends downward. The sixth inner surface 212h intersects with the upper surface 211a of the base portion 211. The sixth inner surface 212h intersects with the first inner surface 212c and the second inner surface 212d. The third inner surface 212e and the fourth inner surface 212f are, for example, perpendicular to the second direction Y. The fifth inner surface 212g and the sixth inner surface 212h are, for example, perpendicular to the first direction X. The first inner surface 212c has a portion that faces the fifth inner surface 212g in the first direction X. The second inner surface 212d also has a portion that faces the fifth inner surface 212g in the first direction X. These portions intersect with the edges of the second upper surface 214a extending in the second direction Y and the edges of the third upper surface 215a extending in the second direction Y, respectively.

[0026] The upper surface 211a of the base 211 has a portion that is exposed inside the frame 212. The upper surface 211a of the base 211 has a first arrangement region 211r and a second arrangement region 211s. In a top view, the first arrangement region 211r is the region located between the edge where the first inner surface 212c and the upper surface 211a intersect and extend in the first direction X, and the edge where the second inner surface 212d and the upper surface 211a intersect and extend in the first direction X. In a top view, the second arrangement region 211s is the region located between the edge where the third inner surface 212e and the upper surface 211a intersect and the edge where the fourth inner surface 212f and the upper surface 211a intersect.

[0027] More specifically, the first arrangement region 211r is located in the first direction X on the side of the sixth inner surface 212h beyond the edge where the first inner surface 212c and the third inner surface 212e intersect. The first arrangement region 211r is not located on the side of the fifth inner surface 212g beyond the edge where the first inner surface 212c and the third inner surface 212e intersect. The second arrangement region 211s is located in the first direction X on the side of the fifth inner surface 212g beyond the edge where the first inner surface 212c and the third inner surface 212e intersect. The second arrangement region 211s is not located on the side of the sixth inner surface 212h beyond the edge where the first inner surface 212c and the third inner surface 212e intersect.

[0028] A virtual plane YA is defined that includes the edge where the first inner surface 212c and the third inner surface 212e intersect, and a line that intersects this edge and is parallel to the second direction Y. In the illustrated example, the virtual plane YA includes the edge where the second inner surface 212d and the fourth inner surface 212f intersect. The first arrangement region 211r is the region on the upper surface 211a of the base 211 that is defined in a top view by the virtual plane YA, the first inner surface 212c, the second inner surface 212d, and the sixth inner surface 212h. The second arrangement region 211s is the region on the upper surface 211a of the base 211 that is defined in a top view by the virtual plane YA, the third inner surface 212e, the fourth inner surface 212f, and the fifth inner surface 212g.

[0029] In a top view, the length of the second top surface 214a in the first direction X is, for example, less than half the length of the third inner surface 212e in the first direction X. In a top view, the length of the third top surface 215a in the first direction X is, for example, less than half the length of the fourth inner surface 212f in the first direction X.

[0030] Here, the first stepped shape 214 and the second stepped shape 215 will be described. The first stepped shape 214 refers to a stepped shape formed by a portion of the edge where the first upper surface 212a and the third inner surface 212e intersect, and by multiple edges where the second upper surface 214a and the first inner surface 212c intersect, in a top view. The portion of the edge where the first upper surface 212a and the third inner surface 212e intersect refers to the portion located on the positive side of the first direction X relative to the virtual surface YA. Similarly, the second stepped shape 215 refers to a stepped shape formed by a portion of the edge where the first upper surface 212a and the fourth inner surface 212f intersect, and by multiple edges where the third upper surface 215a and the second inner surface 212d intersect, in a top view. The portion of the edge where the first upper surface 212a and the fourth inner surface 212f intersect refers to the portion located on the positive side of the first direction X relative to the virtual surface YA.

[0031] One or more metal films may be provided on the second upper surface 214a and the third upper surface 215a. Also, one or more metal films may be provided on the first upper surface 212a. The one or more metal films provided on the second upper surface 214a and / or the third upper surface 215a may include metal films electrically connected to the metal film provided on the first upper surface 212a. Examples of metal films that can be used include Ni / Au (metal films stacked in the order of Ni, Au) and Ti / Pt / Au (metal films stacked in the order of Ti, Pt, Au).

[0032] As shown in Figure 6, the frame portion 212 may further have a second lower surface 216b located opposite the second upper surface 214a and the third upper surface 215a. The second lower surface 216b is joined to the upper surface 211a of the base portion 211, for example, via a metal adhesive. In the illustrated example, in a top view, the second lower surface 216b overlaps with a portion of the first upper surface 212a. The frame portion 212 may further have one or more side surfaces 216c that intersect the second lower surface 216b and extend downward. The side surfaces 216c further intersect the second lower surface 216b. The second lower surface 216b is, for example, parallel to the upper surface 211a of the base portion 211. In the illustrated example, the side surfaces 216c are spaced apart from the side surfaces of the base portion 211.

[0033] As shown in Figures 1 to 4, the lid 213 has an upper surface 213a, a lower surface 213b, and one or more side surfaces 213c that intersect the upper surface 213a and the lower surface 213b. The one or more side surfaces 213c connect the outer edge of the upper surface 213a and the outer edge of the lower surface 213b. The lid 213 is, for example, a rectangular parallelepiped or a cube. In this case, both the upper surface 213a and the lower surface 213b of the lid 213 are rectangular, and the lid 213 has four rectangular side surfaces 213c.

[0034] However, the lid 213 is not limited to a rectangular prism or a cube. In other words, the lid 213 is not limited to a rectangle when viewed from above, and can be any shape such as a circle, ellipse, or polygon.

[0035] The lid portion 213 is supported by the frame portion 212 and is positioned on the upper surface 211a of the base portion 211. The outer periphery of the lower surface 213b of the lid portion 213 is joined, for example, to the first upper surface 212a of the frame portion 212. By joining the lid portion 213 to the frame portion 212, a sealed space is formed surrounded by the base portion 211, the frame portion 212, and the lid portion 213. The lower surface 213b faces the upper surface 211a of the base portion 211 via the sealed space. In addition, at least a portion of the lower surface 213b defines the sealed space.

[0036] The base portion 211 can be formed using, for example, a metal as the main material. For example, copper, copper alloys, etc., can be used as the metal. The frame portion 212 can be formed using, for example, a ceramic as the main material. For example, aluminum nitride, silicon nitride, aluminum oxide, or silicon carbide can be used as the ceramic. The base portion 211 and the frame portion 212 may be formed using, for example, ceramics as the main material, or other insulating materials as the main material.

[0037] The lid portion 213 may have a light-transmitting region that transmits light of a predetermined wavelength. The light-transmitting region constitutes part of the upper surface 213a and the lower surface 213b of the lid portion 213. The light-transmitting region of the lid portion 213 can be formed using, for example, sapphire as the main material. Sapphire is a material with relatively high transmittance and relatively high strength. In addition to sapphire, other translucent materials such as quartz, silicon carbide, or glass may be used as the main material for the light-transmitting region of the lid portion 213. The parts of the lid portion 213 other than the light-transmitting region may be formed integrally with the light-transmitting region using the same material.

[0038] (Light-emitting element 220) In the illustrated example of the light-emitting device 200, one light-emitting element 220 is mounted. The light-emitting device 200 may be equipped with multiple light-emitting elements. The light-emitting element 220 emits directional light. The light-emitting element 220 is, for example, a semiconductor laser element. In the light-emitting device 200 illustrated exemplarily in Figures 1 to 5, a semiconductor laser element is used as the light-emitting element 220.

[0039] The light-emitting element 220 has, for example, a rectangular shape when viewed from above. The side where it intersects with one of the two shorter sides of the rectangle becomes the light-emitting end face from which light is emitted. The top and bottom surfaces of the light-emitting element 220 have a larger area than the light-emitting end face.

[0040] Here, we will explain the case where the light-emitting element 220 is a semiconductor laser element. The light (laser light) emitted from the light-emitting element 220 has a broadened shape and forms an elliptical far-field pattern (hereinafter referred to as "FFP") on a plane parallel to the exit end face. Here, FFP refers to the shape and light intensity distribution of the emitted light at a position away from the exit end face.

[0041] Based on the elliptical light emitted from the light-emitting element 220, the direction passing through the major axis of the ellipse is defined as the fast axis direction of the FFP, and the direction passing through the minor axis of the ellipse is defined as the slow axis direction of the FFP. The fast axis direction of the FFP in the light-emitting element 220 may coincide with the stacking direction in which the multiple semiconductor layers, including the active layer of the light-emitting element 220, are stacked.

[0042] Furthermore, based on the light intensity distribution of the FFP of the light-emitting element 220, 1 / e of the peak intensity value 2 Light with the above intensity will be called the main portion of light. Also, in this light intensity distribution, 1 / e 2 The angle corresponding to the intensity of the FFP is called the spreading angle. The spreading angle of the FFP in the fast axis direction is greater than the spreading angle of the FFP in the slow axis direction.

[0043] Furthermore, the light passing through the center of the elliptical shape of the FFP, in other words, the light with peak intensity in the light intensity distribution of the FFP, will be referred to as light traveling along the optical axis, or light passing through the optical axis. Also, the optical path of light traveling through the center of the elliptical shape of the FFP will be referred to as the optical axis of that light.

[0044] As the light-emitting element 220, a light-emitting element that emits blue light, green light, or red light can be used. In this disclosure, the blue light emitted by the light-emitting element 220 refers to light whose emission peak wavelength is in the range of 420 nm to 494 nm. The green light refers to light whose emission peak wavelength is in the range of 495 nm to 570 nm. The red light refers to light whose emission peak wavelength is in the range of 605 nm to 750 nm. Examples of light-emitting elements 220 that emit blue light and green light include semiconductor laser elements containing nitride semiconductors. Examples of nitride semiconductors that can be used include GaN, InGaN, or AlGaN. Examples of light-emitting elements 220 that emit red light include semiconductor laser elements containing any of the following semiconductor materials: InAlGaP, GaInP, GaAs, and AlGaAs.

[0045] The color of the light emitted from the light-emitting element 220 is not limited to this range. Furthermore, the light-emitting element 220 may emit light with wavelengths outside the wavelength range specified herein.

[0046] (Submount 230) The submount 230 is, for example, configured in the shape of a rectangular parallelepiped and has a bottom surface, a top surface, and one or more sides. The submount 230 has the smallest width in the vertical direction. Note that the shape is not limited to a rectangular parallelepiped. The submount 230 is formed using, for example, aluminum nitride or silicon carbide, but other materials may be used. In addition, a metal film is provided on the top surface of the submount 230.

[0047] (Submount 235) The submount 235 can be made from the same material as the submount 230, for example. Alternatively, it may be made from a different material than the submount 230.

[0048] (light incident body 240) The light incident element 240 has a first side surface 240c and a second side surface 240d located on the opposite side. The first side surface 240c and the second side surface 240d are, for example, parallel to the second direction Y.

[0049] Furthermore, as shown in Figures 7 and 8, the light injector 240 may have an upper surface 240a and a lower surface 240b located opposite the upper surface 240a. The upper surface 240a and the lower surface 240b are, for example, planes perpendicular to the third direction Z. As in the illustrated example, the light injector 240 may further include a third surface 240e and a fourth surface 240f that intersect the second surface 240d and extend in the first direction X, respectively. The third surface 240e and the fourth surface 240f may further intersect the first surface 240c.

[0050] In the examples shown in Figures 7 and 8, the light incident body 240 has a light incident portion 241 and a surrounding portion 242. The light incident portion 241 has a light incident surface into which light is incident. The surrounding portion 242 has surfaces that surround multiple sides of the light incident portion 241. The surrounding portion 242 does not surround the entire surface of the light incident portion 241. At least the light incident surface and the light emission surface of the light incident portion 241 are exposed and not surrounded by the surrounding portion. Note that the light incident body 240 does not have to consist of a light incident portion 241 and a surrounding portion 242; for example, it may consist only of a light incident portion 241, or it may have a light incident portion 241 and other components.

[0051] An example of the structure of the light incident section 241 will be described with reference to Figures 7 to 9. Note that the structure or shape of the light incident section 241 is not limited thereto. The light incident section 241 has, for example, an upper surface 241a, a lower surface 241b which is the opposite surface to the upper surface 241a, and one or more side surfaces. In the illustrated example, the light incident section 241 has one or more side surfaces, namely the incident side surface 241i, the first side surface 241c, the second side surface 241d, the third side surface 241e, and the fourth side surface 241f. In the example shown in Figure 8, the incident side surface 241i constitutes at least a part of the first side surface 240c of the light incident body 240.

[0052] The first side surface 241c, the second side surface 241d, the third side surface 241e, and the fourth side surface 241f connect to the outer edge of the upper surface 241a and the outer edge of the lower surface 241b. The third side surface 241e connects the first side surface 241c and the fourth side surface 241f. The fourth side surface 241f connects the second side surface 241d and the third side surface 241e.

[0053] The first side surface 241c and the second side surface 241d are connected to each other on the upper side, and each is connected to the incident side surface 241i on the lower side. The lower side of the incident side surface 241i is connected to the outer edge of the lower surface 241b. The lower side of the incident side surface 241i is recessed inward from the connection point between the first side surface 241c and the second side surface 241d. In the example shown in Figure 4, the recess is in the positive direction of the first direction X.

[0054] In a top view, the first side 241c and the fourth side 241f may be parallel. Also, in a top view, the second side 241d and the third side 241e may be parallel. Furthermore, in a top view, the first side 241c and the second side 241d, the first side 241c and the third side 241e, the third side 241e and the fourth side 241f, and the fourth side 241f and the second side 241d may each be perpendicular.

[0055] Next, the surrounding portion 242 will be described. The surrounding portion 242 has an upper surface, one or more lower surfaces which are opposite to the upper surface, a plurality of inner surfaces which intersect with the inner edge of the upper surface and contact the first to fourth sides 241c to 241f of the light incident portion 241, and a plurality of outer surfaces which intersect with the outer edge of the upper surface and / or the outer edge of the lower surface. The reflectance of the surrounding portion 242 with respect to light incident on one or more inner surfaces may be 80% or more and 100% or less.

[0056] The surrounding portion 242 covers the first side surface 241c to the fourth side surface 241f of the light incident portion 241. The incident side surface 241i of the light incident portion 241 is not covered by the surrounding portion 242 and is exposed from the surrounding portion 242. As a result, light incident from, for example, the incident side surface 241i and emitted from the side surface of the light incident portion 241 is reflected back to the light incident portion 241. Light incident on the light incident portion 241 is emitted from the upper surface 241a.

[0057] In a top view, the edges connecting one or more outer surfaces of the surrounding portion 242 to the top surface are all spaced apart from the first surface 241c, second surface 241d, third surface 241e, and fourth surface 241f of the light incident portion 241. In the illustrated example, the multiple outer surfaces of the surrounding portion 242 are included in the second surface 240d, third surface 240e, and fourth surface 240f of the light incident body 240. Alternatively, one outer surface of the surrounding portion 242 may form a single plane continuous with the incident surface 241i of the light incident portion 241, constituting the first surface 240c of the light incident body 240. In a top view, one or more outer surfaces of the surrounding portion 242 may all be parallel or perpendicular to one of the two diagonals of the light incident portion 241. In a top view, one or more outer surfaces of the surrounding portion 242 may be parallel or perpendicular to the incident surface 241i of the light incident portion 241.

[0058] The upper surface 241a of the light incident portion 241 and the upper surface of the surrounding portion 242 may form a single continuous plane. Alternatively, the lower surface of the light incident portion 241 and one of the lower surfaces of the surrounding portion 242 may form a single continuous plane.

[0059] In the illustrated example, the enclosing portion 242 further comprises a projection 242t. The projection 242t is located above the incident side 241i and protrudes from the incident side 241i toward the opposite side of the second side 240d in a direction perpendicular to the incident side 241i.

[0060] The protrusion 242t includes a part of the upper surface of the surrounding portion 242, one outer surface, and one lower surface. The lower surface constituting the protrusion 242t is a different lower surface from the lower surface of the surrounding portion 242 that constitutes the lower surface 240b of the light incident body 240. Also, when the light incident body 240 has the protrusion 242t, the outer surface that intersects with the upper surface of the surrounding portion 242 is not included in the first surface 240c.

[0061] Up to this point, the shape of the light injector 240 has been described, but the shape of the light injector 240 is not limited to this. For example, it may be a rectangular parallelepiped, or it may have a shape that includes a circular arc in part.

[0062] The light incident element 240 is, for example, a wavelength conversion member. In this case, the light incident part 241 is a wavelength conversion part having a phosphor. Below, an example of the structure when the light incident element is a wavelength conversion member will be described.

[0063] If the light incident section 241 is a wavelength conversion section, the light incident section 241 converts light incident from, for example, the incident side surface 241i, which is the light incident surface, into light of a different wavelength, and emits the converted light from, for example, the upper surface 241a. The light incident section 241 may convert a portion of the incident light into light of a different wavelength, or it may convert all of the incident light into light of a different wavelength. Alternatively, an optical film such as a DBR (Distributed Bragg Reflector) film that transmits the wavelength-converted light and reflects the incident light may be provided on the upper surface of the wavelength conversion member or wavelength conversion section, either selectively or in combination with the above. In this way, it is possible to configure the light incident section 241 so that a portion of the light incident into the light incident section 241 is not emitted from the upper surface 241a of the light incident section 241.

[0064] The base material of the light incident section 241 is preferably formed using an inorganic material that is not easily decomposed by light irradiation as the main material. The main material is, for example, ceramics. Examples of main materials other than ceramics include sapphire and quartz. When the main material of the light incident section 241 is ceramics, examples of ceramics include aluminum oxide, aluminum nitride, silicon oxide, yttrium oxide, zirconium oxide, or magnesium oxide. The main material is the material that accounts for the largest proportion by weight or volume among its constituent elements. Furthermore, the constituent elements may be formed using only the main material.

[0065] The light-incident portion 241 can be formed, for example, by sintering a phosphor with a translucent material such as aluminum oxide. The phosphor content can be 0.05% to 50% by volume relative to the total volume of the ceramics. Alternatively, ceramics consisting substantially only of phosphor, obtained by sintering phosphor powder, may be used. Furthermore, the light-incident portion 241 may be formed from a single crystal of phosphor.

[0066] Examples of phosphors include cerium-activated yttrium aluminum garnet (YAG), cerium-activated lutetium aluminum garnet (LAG), europium-activated silicate ((Sr,Ba)2SiO4), α-sialon phosphors, and β-sialon phosphors. Among these, YAG phosphors exhibit good heat resistance.

[0067] The surrounding portion 242 is, for example, a sintered body formed primarily from ceramics. Examples of ceramics that can be used as the main material include aluminum oxide, aluminum nitride, silicon oxide, yttrium oxide, zirconium oxide, and magnesium oxide. However, the surrounding portion 242 does not necessarily have to be made primarily from ceramics. The surrounding portion 242 may be formed using, for example, metal, a composite of ceramics and metal, or resin.

[0068] The light incident element 240 can be constructed by integrally forming a light incident portion 241 and a surrounding portion 242. Alternatively, the light incident portion 241 and the surrounding portion 242 may be formed separately and then joined together to form the light incident element 240. The light incident portion 241 and the surrounding portion 242 can be integrally formed, for example, by a sintered body. For example, an integral sintered body can be formed by first forming a sintered body of the light incident portion 241, and then integrally forming a sintered body of the surrounding portion 242 together with the light incident portion 241.

[0069] Up to this point, we have described the case where the light injector 240 is a wavelength conversion member, but the light injector 240 does not have to be a wavelength conversion member. The light injector 240 is, for example, an object having a configuration in which light is incident on a predetermined region and light is emitted from another region. More specifically, the light injector 240 is an object having a configuration in which directional light is incident on it and light having a weaker directionality than the directionality of the incident light, or light that does not have directionality, is emitted. As an example, in addition to a wavelength conversion member, a light scatterer can be given. For example, the light incident portion 241 can be formed as a light scattering portion. Also, it does not have to have a surrounding portion 242. Alternatively, it may be a diffracting member that diffracts the incident light and emits it.

[0070] The light incident element 240 may have, for example, an anti-reflective coating on its upper surface 240a. The anti-reflective coating can be provided on the upper surface 241a of the light incident section 241, or on the upper surface 241a of the light incident section 241 and the upper surface of the surrounding section 242. The light incident element 240 may also have a metal film on the lower surface 241b of the light incident section 241 and the lower surface of the surrounding section 242. Furthermore, the light incident element 240 may have a reflective coating on the incident side surface 241i of the light incident section 241 that reflects light emitted to the outside from the incident side surface 241i.

[0071] (Protection element 250) The protective element 250 is a component for protecting a specific element, such as a semiconductor laser element. For example, the protective element 250 is a component for preventing excessive current from flowing through and damaging a specific element, such as a semiconductor laser element. As the protective element 250, for example, a Zener diode made of Si can be used. Alternatively, for example, the protective element 250 may be a component for measuring temperature to prevent the specific element from failing due to the temperature environment. A thermistor can be used as such a temperature measuring element. The temperature measuring element is preferably placed near the emission end face of the light-emitting element 220.

[0072] (Wiring 270) The wiring 270 is composed of a conductor having a linear shape with joints at both ends. In other words, the wiring 270 has joints at both ends of the linear portion for joining with other components. The wiring 270 is used for electrical connection between two components. As the wiring 270, for example, a metal wire can be used. Examples of metals include gold, aluminum, silver, copper, and tungsten.

[0073] (Light-emitting device 200) Next, the light-emitting device 200 will be described with reference to Figures 1 to 11.

[0074] In the light-emitting device 200, a light-emitting element 220 and a light-incident element 240 are arranged on the upper surface 211a of the base 211. In the illustrated example, the light-emitting element 220 is arranged on the upper surface 211a via a submount 230. The light-incident element 240 is arranged on the upper surface 211a via a submount 235. As will be described later, since the light-incident element 240 is longer than the length between the first inner surface 212c and the second inner surface 212d, in the second direction Y, the submount 235 is longer than the submount 230. In the third direction Z, the height of the submount 230 is greater than the height of the submount 235. This allows light that travels downward from the light-emitting element 220 to be efficiently incident on the light-incident section 241. The submounts 230 and 235 are joined to the upper surface 211a, for example, via a metal adhesive.

[0075] The light-emitting element 220 and the light injector 240 are surrounded by the frame portion 212 on the upper surface 211a of the base portion 211. More specifically, the light-emitting element 220 is positioned in the first arrangement region 211r. As shown in the illustrated example, the light-emitting element 220 may be positioned across the first arrangement region 211r and the second arrangement region 211s. The light injector 240 is positioned in the second arrangement region 211s. The light injector 240 is not positioned in the first arrangement region 211r. The light-emitting element 220 emits light that is directional toward the side. The light traveling toward the side is emitted toward the first side surface 240c of the light injector 240.

[0076] Furthermore, a cover portion 213 is positioned above the light-emitting element 220 and the light-incident element 240. The light-emitting element 220 and the light-incident element 240 are positioned in the sealing space formed by the base portion 211, the frame portion 212, and the cover portion 213.

[0077] In this specification, the direction in which light propagates along the optical axis OA of light emitted from the light-emitting element 220 is sometimes referred to as the "optical propagation direction." Furthermore, when two components are positioned such that one is in the positive direction of the optical propagation direction relative to the other, the other is said to be positioned on the "optical propagation direction side" relative to the other. In the illustrated example, the "optical propagation direction" coincides with the positive direction of the first direction X, and one component being positioned on the "optical propagation direction side" relative to the other is equivalent to being positioned further towards the positive direction of the first direction X. The optical axis OA of light emitted from the light-emitting element 220 is, for example, parallel to the first inner surface 212c and the second inner surface 212d. The optical axis OA is also, for example, perpendicular to the fifth inner surface 212g and the sixth inner surface 212h.

[0078] The light-emitting element 220 is positioned such that its emission end face 220a faces the same direction as one side of the submount 230. Furthermore, the emission end face 220a of the light-emitting element 220 is perpendicular to, for example, the first inner surface 212c of the frame portion 212.

[0079] One of the two sides of the light-emitting element 220 that intersects with the exit end face 220a faces the first inner surface 212c of the frame portion 212. The other side of the light-emitting element 220 that intersects with the exit end face is, for example, parallel to the first inner surface 212c. The other side of the light-emitting element 220 that intersects with the exit end face faces the second inner surface 212d of the frame portion 212. The other side of the light-emitting element 220 that intersects with the exit end face is, for example, parallel to the second inner surface 212d.

[0080] The light indicator 240 is positioned such that its first side surface 240c faces the light-emitting element 220. More specifically, the first side surface 240c is positioned so as to face the emission end surface 220a of the light-emitting element 220. In the illustrated example, the outer surface included in the protrusion 242t does not face the light-emitting element. In the illustrated example, the protrusion 242t is positioned so as to overlap with the light-emitting element 220 when viewed from above. This allows the protrusion 242t to reflect light even if the submount 230 on which the light-emitting element 220 is mounted falls off and emits light upwards.

[0081] Furthermore, the incident side surface 241i of the light incident section 241, which constitutes a part of the first side surface 240c, faces the exit end surface 220a of the light-emitting element 220. Light emitted from the exit end surface 220a and traveling laterally is incident on the incident side surface 241i. At least a part of the incident side surface 241i is located below the optical axis OA. Light incident on the incident side surface 241i is emitted, for example, from the upper surface 241a. Light emitted from the upper surface 241a includes light that was incident on the light incident section 241, reflected by the surrounding section 242, and then incident on the light incident section 241 again. In the examples of Figures 1 to 11, the upper surface 241a of the light incident section 241 is the exit surface of the light incident body 240. If the light incident section 241 is a wavelength conversion section having a phosphor, the light incident on the incident side surface 241i and wavelength-converted light is emitted upward.

[0082] The light injector 240 has a second side surface 240d located opposite the first side surface 240c. The second side surface 240d faces another component. The surface of the other component that faces the second side surface 240d is called the first opposing surface. In other words, the light-emitting device 200 has a first opposing surface that faces the second side surface 240d of the light injector 240. In the example in Figure 10, the fifth inner surface 212g of the frame 212 is the first opposing surface.

[0083] Note that the first opposing surface is not limited to the fifth inner surface 212g of the frame portion 212. Although not shown, if other components such as a lens are arranged on the opposite side of the light-emitting element 220 from the light-incident element 240 in the first direction X, the surface of the component such as the lens that faces the second surface 240d of the light-incident element 240 becomes the first opposing surface.

[0084] The light-emitting device 200 may further have a second opposing surface facing the third side surface 240e of the light incident element 240, and a third opposing surface facing the fourth side surface 240f. In the example of Figure 10, the second opposing surface is the third inner surface 212e of the frame portion 212, and the third opposing surface is the fourth inner surface 212f of the frame portion 212.

[0085] As shown in Figure 10, in the second direction Y, the length L1 of the light incident element 240 is longer than the length L2 between the first inner surface 212c and the second inner surface 212d of the frame portion 212. Due to this dimensional relationship, even if the light incident element 240 detaches from the base portion 211, the movement of the light incident element 240 in the first direction X is restricted. Specifically, the movement of the light incident element 240, which is positioned in the second positioning region 211s, to the first positioning region 211r can be suppressed. Also, in the second direction Y, the distance L3 between the third inner surface 212e and the fourth inner surface 212f is longer than the length L2 between the first inner surface 212c and the second inner surface 212d.

[0086] Furthermore, as shown in Figure 11, in the third direction Z, the length H1 of the light injector 240 is longer than the length H2 from the top surface of the light-emitting element 220 to the bottom surface 213b of the cover 213. Due to this dimensional relationship, even if the light injector 240 detaches from the base 211, it is possible to restrict the movement of the light injector 240 in the first direction X and its movement above the light-emitting element 220. In the third direction Z, the height H3 of the top surface 240a of the light injector 240 from the top surface 211a of the base 211 is higher than the height H4 of the top surface of the light-emitting element 220 from the top surface 211a of the base 211. Also, in the third direction Z, the distance H6 between the top surface 240a of the light injector 240 and the bottom surface 213b of the cover 213 is smaller than the difference between the thickness of the submount 230 and the thickness of the submount 235. This restricts the movement of the light injector 240 in the first direction X. More specifically, it is possible to restrict the movement of the light indicator 240 toward the light-emitting element 220.

[0087] Thus, the light-emitting device 200 has a structure that restricts the movement of the light-incident element 240 in the first direction X and the third direction Z, even if the light-incident element 240 detaches from the base 211. Therefore, even if the light-incident element 240 detaches from the base 211, the light-incident element 240 remains in the position where light from the light-emitting element 220 is incident. As a result, the light emitted from the light-emitting element 220 is less likely to directly escape to the outside of the light-emitting device 200, thus realizing a light-emitting device 200 with superior safety.

[0088] Furthermore, in the first direction X, the length L4 of the light indicator 240 is longer than the length L5 of the light-emitting element 220. In addition, in a side view, it is preferable that the length L6 of the diagonal of the light indicator 240 is longer than the length in the third direction Z from the lower surface 240b of the light indicator 240 to the lower surface 213b of the lid 213. Here, the length of the diagonal of the light indicator 240 refers to the line segment connecting the point on the upper surface 240a closest to the light-emitting element 220 and the point on the lower surface 240b closest to the first opposing surface (the fifth inner surface 212g in the illustrated example). This makes it possible to suppress rotational movement of the light indicator 240 in a side view.

[0089] Preferably, the light injector 240 is fixed directly or indirectly to the base 211 only at its lower surface 240b. In the illustrated example, the lower surface 240b of the light injector 240 is in contact with the upper surface of the submount 235. The upper surface and one or more sides of the light injector 240 are arranged at a distance from other members. That is, the second side 240d of the light injector 240 has a space between it and the first opposing surface. The third side 240e has a space between it and the second opposing surface. The fourth side 240f has a space between it and the third opposing surface. The upper surface 240a has a space between it and the lower surface 213b of the lid 213.

[0090] Thus, by having a space between the side surface of the light injector 240 and the opposing surface facing that side surface, the position of the light injector 240 can be easily adjusted when it is mounted in the light-emitting device 200. Furthermore, this arrangement improves the degree of freedom in the layout within the light-emitting device 200.

[0091] In the illustrated example, the lower surface 240b of the light injector 240 is joined to the upper surface of the submount 235 using a joining member. The upper surface of the submount 235 is not located above the lower surface of the light-emitting element 220. In the illustrated example, the upper surface of the submount 235 is located below the lower surface of the light-emitting element 220. This allows light emitted from the light-emitting element 220 that travels below the optical axis to be efficiently captured by the light injector 241i from the injector side 241i.

[0092] In the illustrated example, in a side view, the endpoint on the lower surface 240b of the light incident element 240, located furthest in the direction of light propagation, is located further in the direction of light propagation than the endpoint on the upper surface of the submount 235, located furthest in the direction of light propagation. This arrangement allows the distance between the light incident element 240 and the first opposing surface (fifth inner surface 212g) to be reduced. Furthermore, the endpoint on the upper surface of the submount 235, located furthest in the direction of light propagation, is located on the opposite side of the direction of light propagation than the endpoint on the lower surface 240b of the light incident element 240. This arrangement allows the entire lower surface of the light incident portion 241 into which light enters the light-emitting element 220 to be directed is in contact with the upper surface of the submount 235, thus enabling efficient heat dissipation.

[0093] Next, specific examples of dimensional relationships in the light-emitting device 200 will be described. In the first direction X, the length L7 of the space between the first opposing surface (in the illustrated example, the fifth inner surface 212g of the frame portion 212) and the second surface 240d is 50 μm or more and 400 μm or less. Setting it to 50 μm or more improves ease of mounting and the degree of freedom of layout. Setting it to 400 μm or less makes it possible to restrict the movement of the light incident element 240 in the first direction X.

[0094] Furthermore, in the second direction Y, the length L8 of the space between the third inner surface 212e (second opposing surface) of the frame portion 212 and the third side surface 240e of the light incident element 240, and the length L9 of the space between the fourth inner surface 212f (third opposing surface) of the frame portion 212 and the fourth side surface 240f of the light incident element 240 are preferably 50 μm or more and 400 μm or less. By setting lengths L8 and L9 to 50 μm or more, the ease of mounting and the degree of freedom of layout can be improved. By setting them to 400 μm or less, it is possible to restrict the movement of the light incident element 240 in the second direction Y. Furthermore, in the second direction Y, the length L1 of the light incident element 240 is preferably 0.6 times or more and 0.95 times the distance L3 between the third inner surface 212e and the fourth inner surface 212f of the frame portion 212.

[0095] In the third direction Z, the length H6 of the space between the upper surface 240a of the light injector 240 and the lower surface 213b of the lid 213 is preferably 50 μm or more and 400 μm or less. Setting it to 50 μm or more improves ease of mounting and freedom of layout. Setting it to 400 μm or less allows for restriction of the movement of the light injector 240 in the third direction Z. Furthermore, in the third direction Z, the length H1 of the light injector 240 and the distance H5 from the upper surface 240a of the light injector 240 to the lower surface 213b of the lid 213 are preferably 0.05 times or more and 0.99 times or less, and more preferably 0.2 times or more and 0.95 times or less.

[0096] In the first direction X, the length L4 of the light incident element 240 is preferably 0.5 to 1.1 times the length from the exit end face 220a of the light-emitting element 220 to the fifth inner surface 212g of the frame portion 212. Also, in the first direction X, the length L10 from the incident surface 241i to the exit end face 220a of the light-emitting element 220 is preferably 5 μm to 1000 μm. More preferably, it is 400 μm or less.

[0097] Here, the light incident body 240 can have, for example, a length of the upper surface 240a in the first direction X of 20 μm or more and 3000 μm or less. Also, the length of the upper surface 240a in the second direction Y of 20 μm or more and 3000 μm or less can be set. Furthermore, in the third direction Z, the height between the upper surface 240a and the lower surface 240b can be set to 20 μm or more and 3000 μm or less.

[0098] Furthermore, in a side view, it is preferable that the cross-sectional area of ​​the upper surface 240a of the light indicator 240 cut by the XZ plane passing through the midpoint of the side of the side extending in the second direction Y is larger than the cross-sectional area of ​​the upper surface 220 of the light-emitting element 220 cut by the XZ plane passing through the midpoint of the side of the side extending in the second direction Y is larger. Moreover, it is preferable that the volume of the light indicator 240 is larger than the volume of the light-emitting element 220. In addition, the volume of the sealing space in which the base 211, frame 212, and lid 213 of the package 210 are determined does not exceed 20 times the volume of the light indicator 240. Preferably, it does not exceed 10 times.

[0099] In a top view, the length of the diagonal of the upper surface 240a of the light incident element 240 is longer than the length L3. This length restricts the rotational movement of the light incident element 240 in the XY plane. More specifically, in a top view, the light incident element 240 can only rotate by 30 degrees or less in the rotational direction of the XY plane, with respect to the diagonal of its upper surface 240a as the axis.

[0100] When the light incidence section 241 is a wavelength conversion section, the light emitted from the light-emitting element 220 (first light) is incident on the incident side surface 241i of the wavelength conversion section and converted by the wavelength conversion section into light of a different wavelength (second light). The first light incident from the incident side surface 241i is emitted from the upper surface 241a. The converted second light is also emitted from the upper surface 241a. The first light and the second light are emitted upward from the upper surface 241a of the light incidence section 241. In this way, by arranging a wavelength conversion member with a light incidence surface on the side and a light emission surface on the upper surface, it is possible to achieve optical path conversion and wavelength conversion from the side to the top.

[0101] In a top view, the upper surface 241a of the light incident portion 241 may be symmetric with respect to the optical axis OA. Similarly, in a top view, the upper surface of the surrounding portion 242 may be symmetric with respect to the optical axis OA. The direction of the optical axis OA is parallel to the first direction X.

[0102] In the illustrated example, the protrusion 242t protrudes toward the light-emitting element 220 beyond the end of the lower surface 240b of the light-incident element 240 that is on the side of the light-emitting element 220. It is preferable that the protrusion 242t is positioned so as to overlap the emission end face 220a of the light-emitting element 220 when viewed from above. It is even more preferable that the protrusion 242t is positioned so as to overlap the entire emission end face 220a of the light-emitting element 220 when viewed from above.

[0103] The second upper surface 214a and / or the third upper surface 215a are higher than the height of the upper surface of the light-emitting element 220, for example, with respect to the upper surface 211a of the base 211. In the illustrated example, the second upper surface 214a and / or the third upper surface 215a are lower than the height of the upper surface 240a of the light-incident element 240, for example, with respect to the upper surface 211a of the base 211. Similarly, the second upper surface 214a and / or the third upper surface 215a are lower than the upper surface 241a of the light-incident portion 241, with respect to the upper surface 211a. The second upper surface 214a and / or the third upper surface 215a are higher than the lower surface included in the protrusion 242t of the light-incident element 240, with respect to the upper surface 211a. By having the upper surface 240a of the light indicator 240 positioned higher than the second upper surface 214a and / or the third upper surface 215a, the length of H6 can be suppressed from increasing. Furthermore, by having the lower surface included in the protrusion 242t of the light indicator 240 positioned lower than the second upper surface 214a and / or the third upper surface 215a, the protrusion and the first inner surface 212c and / or the second inner surface 212d come into contact when the light indicator 240 moves toward the light-emitting element 220. This improves the effect of restricting the movement of the light indicator 240 in the first direction X.

[0104] In the first direction X, the length L12 from the end of the protrusion 242t of the light incident body 240 to the end of the first inner surface 212c of the frame portion 212 that is closer to the exit end surface 220a is preferably smaller than the length L10. By setting the length in this way, when the light incident body 240 falls off, the protrusion 242t contacts the first inner surface 212c before the incident surface 241i contacts the exit end surface 220a. This makes it possible to create a light-emitting device that can further restrict the movement of the light incident body 240. The length L12 is, for example, 30 μm or more and 500 μm or less. 30 μm is the minimum length that allows the end of the protrusion 242t and the end of the first inner surface 212c to be brought closer together in the first direction X. Furthermore, if the length between the end of the protrusion 242t and the end of the first inner surface 212c in the first direction X is 500 μm or less, the rotational displacement of the light incident body 240 in a top view can be suppressed.

[0105] In the light-emitting device 200, the light-emitting element 220 and the protection element 250 are electrically connected to the base 211 by wiring 270. The wiring 270 in the illustrated light-emitting device 200 is an example where the protection element 250 is a Zener diode, but if the protection element 250 is a temperature measuring element, the wiring connection may differ from that shown in the figure.

[0106] The light-emitting element 220 is electrically connected via wiring 270 to a metal film provided on the second upper surface 214a and / or the third upper surface 215a. The illustrated light-emitting device 200 has a plurality of wirings 270. The plurality of wirings 270 include wiring 270 in which one end of the connection is joined to the second upper surface 214a and the other end of the connection is joined to the upper surface of the light-emitting element 220. Furthermore, it includes wiring 270 in which one end of the connection is joined to the third upper surface 215a and the other end of the connection is joined to the submount 230.

[0107] For the electrical connection between the light-emitting element 220 and the external power supply, for example, a metal film provided on the lower surface 211b of the base 211 and / or the first lower surface 212b of the frame 212 can be used. This allows the light-emitting element 220 and the external power supply to be electrically connected via the metal film on the lower surface 211b and / or the first lower surface 212b, which is electrically connected to the metal film provided on the second upper surface 214a and / or the third upper surface 215a via a metal material provided in the via hole.

[0108] The lid portion 213 has a light-transmitting region that transmits light emitted from the upper surface 240a of the light incident element 240 to the outside. The entire lower surface 213b of the lid portion 213 may be the light incident surface, and the entire lid portion 213 may be a light-transmitting region. Preferably, the light-transmitting region of the lid portion 213 transmits 50% or more, and more than 70% or more, of the light emitted from the light-emitting element 220 and the light emitted from the light incident element 240. The lid portion 213 may have a light-transmitting region in only a part of it.

[0109] Furthermore, the lid portion 213 may have a light-shielding portion. The light-shielding portion prevents light from entering the lower surface 213b or from emitting light from the upper surface 213a. The light-shielding portion constitutes a part of the upper surface 213a or the lower surface 213b of the lid portion 213. The light-shielding portion may be partially provided, for example, on the upper surface 213a and / or the lower surface 213b of the lid portion 213. Alternatively, for example, the light-shielding portion may be formed by constructing the portion of the lid portion 213 other than the light-transmitting region with a light-shielding material including metal or the like.

[0110] [Second Embodiment] The light-emitting device 200A according to the second embodiment will be described with reference to Figures 1 and 12 to 14. Figure 1 is a perspective view of the light-emitting device 200A according to the second embodiment. Figure 12 is a top view illustrating the internal structure of the light-emitting device 200A according to the second embodiment. Figure 13 is a cross-sectional view taken along line XIII-XIII in Figure 12, illustrating the light-emitting device 200A according to the second embodiment. Figure 14 is a top view illustrating another internal structure of the light-emitting device 200A according to the second embodiment. For reference, Figures 1 and 12 to 14 show mutually orthogonal X, Y, and Z axes. The directions parallel to the X, Y, and Z axes are referred to as the first direction X, second direction Y, and third direction Z, respectively. The first direction X and the second direction Y are parallel to the upper surface 211a of the base 211, and the third direction Z is perpendicular to the upper surface 211a of the base 211.

[0111] As shown in Figure 12, the light-emitting device 200A differs from the light-emitting device 200 according to the first embodiment in that the frame portion 212A does not have a stepped shape on its inner edge when viewed from above, but has a stepped portion provided on the entire length of one or two sides extending in the first direction X of the first upper surface 212a. The following description will focus on the differences between the light-emitting device 200A and the light-emitting device 200 according to the first embodiment, and parts common to the first embodiment will be omitted as appropriate.

[0112] (Frame part 212A) The frame portion 212A has an upper surface 212a. One or more stepped portions are provided along the entire length of one or two sides of the inner edge shape of the upper surface 212a that extend in the first direction X. In the illustrated example, multiple stepped portions are provided, with the first stepped portion 214A and the second stepped portion 215A being located inside the frame portion 212A. The first stepped portion 214A has an upper surface 214a. The second stepped portion 215A has an upper surface 215a. The upper surfaces 214a and 215a are higher than the upper surface 211a of the base portion 211 and lower than the upper surface 212a of the frame portion 212A.

[0113] The frame portion 212A has a first inner surface 212c and a second inner surface 212d that intersect with the upper surface 212a and extend downward. The first inner surface 212c intersects with the upper surface 214a of the first stepped portion 214A. The second inner surface 212d intersects with the upper surface 215a of the second stepped portion 215A. The first inner surface 212c and the second inner surface 212d do not intersect with the upper surface 211a of the base portion 211. The first stepped portion 214A has a side surface 214c that intersects with the upper surface 214a and extends downward. The side surface 214c intersects with the upper surface 211a of the base portion 211. The second stepped portion 215A has a side surface 215c that intersects with the upper surface 215a and extends downward. The side surface 215c intersects with the upper surface 211a of the base portion 211. The upper surface 211a of the base 211 has an area exposed between the side surfaces 214c and 215c. It is not necessary to provide a stepped portion on the inside of the frame 212A. In that case, the first inner surface 212c and the second inner surface 212d intersect the upper surface 211a of the base 211. The metal film electrically connected to the light-emitting element 220 is provided on the upper surface 211a of the base 211. However, having a stepped portion and providing the metal film on its upper surface to connect to the wiring makes it easier to restrict the movement of the light indicator 240 and the light-emitting element 220 than connecting the metal film on the upper surface 211a of the base 211 to the wiring. The frame 212A further has two inner surfaces connecting the first inner surface 212c and the second inner surface 212d, and side surfaces 214c and 215c.

[0114] (Light-emitting device 200A) Next, the light-emitting device 200A will be described with reference to Figures 1 and 12-14.

[0115] The light-emitting element 220 and the light-incident element 240 are located between the edges where the side surface 214c and the top surface 211a intersect, and between the edges where the side surface 215c and the top surface 211a intersect. As shown in the example in Figure 12, in the second direction Y, the difference between the length L1 of the light-incident element and the length L11 between the side surfaces 214c and 215c of the frame portion 212A can be made 1000 μm or less. By making the size of the light-incident element 240 such a size, the overall size of the light-emitting device 200A can be reduced.

[0116] In the example shown in Figure 13, the light-emitting element 220 and the light injector 240 are arranged on a single submount 230 in the light-emitting device 200A. The lower surface 240b of the light injector 240 is joined to the upper surface of the submount 230 via a bonding member. By arranging the light-emitting element 220 and the light injector 240 on the same submount 230 in this way, the light-emitting element 220 and the light injector 240 can be brought closer together. As a result, even if the submount 230 falls off, light from the light-emitting element 220 can still be incident on the light injector 240. Furthermore, the light-emitting device 200A can be miniaturized. In the illustrated example, in the third direction Z, the length of the light injector 240 is shorter than the length from the upper surface of the light-emitting element 220 to the lower surface 213b of the cover portion 213. As shown in Figure 13, in a side view, the end point of the submount 230 that is furthest to the light propagation side in the second direction Y is located furthest to the light propagation side of the end point of the light injector 240 in the second direction Y. This arrangement improves heat dissipation from the lower surface of the light incident element 240 to the submount 230. Alternatively, as in the first embodiment, the endpoint of the submount 230 located furthest towards the light propagation side in the second direction Y may be positioned on the opposite side of the light propagation direction from the endpoint of the light incident element 240 located furthest towards the light propagation side in the second direction Y.

[0117] Thus, the light-emitting device 200A can achieve miniaturization of the light incident element 240 and the entire light-emitting device 200A. On the other hand, compared to the light-emitting device 200 according to the first embodiment, there is a risk that the restriction on the movement of the light incident element 240 in the first direction X will be reduced. Therefore, by devising a way to connect the wiring 270, the movement of the light incident element 240 in the first direction X can be restricted. One or more wirings 270 are connected to the upper surface 214a of the first stepped portion 214A and / or the upper surface 215a of the second stepped portion 215A.

[0118] In the third direction Z, the length H7 from the top surface 240a of the light indicator 240 to the top surface of the light-emitting element 220 is longer than the length H8 from the top surface 240a of the light indicator 240 to the top point of the wiring 270. Also, with respect to the top surface 211a of the base 211, the height of the top point of the wiring 270 is higher than the bottom surface of the protrusion 242t of the light indicator 240. By joining the top point of the wiring 270 to this height, the movement of the light indicator 240 in the first direction X when it falls off can be restricted. Furthermore, in the illustrated example, the top point of the wiring 270 is located higher than the top surface 214a and / or the top surface 215a.

[0119] In the third direction Z, the length from the upper surface 211a of the base 211 to the uppermost point of the wiring 270 is preferably longer than half the length H5 from the upper surface 211a to the lower surface 213b of the cover 213. In the illustrated example, the length H8 is, for example, 0.1 to 0.8 times the length H7. More preferably, the length H8 is 0.5 times or less the length H7. By joining the wiring 270 in this way, the movement of the light incident body 240 in the first direction X can be restricted. The length H8 is, for example, -200 μm to 500 μm. Here, a negative value indicates that the uppermost point of the wiring 270 is higher than the upper surface 240a of the light incident body 240, and a positive value indicates that the uppermost point of the wiring 270 is lower than the upper surface 240a of the light incident body 240. In other words, the highest point of the wiring 270 is, for example, located at a position of 200 μm or less above the upper surface 240a of the light incident element 240, and at a position of 500 μm or less below it.

[0120] Furthermore, in a top view, of the one or more wirings 270 that connect to the top surface of the light-emitting element 220, the wiring 270 closest to the light-incident element 240 in the first direction X connects to the top surface 214a and / or the top surface 215a with respect to the first direction X, on the side of the optical propagation direction from the midpoint of the light-emitting element 220. By connecting the wirings 270 in this way, the range of movement of the light-incident element 240 in the first direction X can be narrowed. In the illustrated example, of the multiple wirings 270 that connect to the top surface 214a, at least one wiring 270 connects to the top surface 214a on the side of the optical propagation direction from the midpoint of the light-emitting element 220. Of the multiple wirings 270 that connect to the top surface 215a, at least one wiring 270 connects to the top surface 215a on the side of the optical propagation direction from the midpoint of the light-emitting element 220. The protective element 250 is positioned on the top surface of the submount 230 on the side of the optical propagation direction from the center of the light-emitting element 220.

[0121] Furthermore, in a top view, the length L13 from the end of the protrusion 242t of the light injector 240 to the end of the wiring 270 in the first direction X is preferably 50 μm or more and 1200 μm or less. Due to this dimensional relationship, even if the light injector 240 detaches from the submount 230, the end of the protrusion 242t of the light injector 240 is blocked by the wiring 270, thus restricting the movement of the light injector 240 in the first direction X. For example, even if the light injector 240 detaches from the submount 230, the light injector 240 can be easily kept in the position where light from the light-emitting element 220 is incident. As a result, it is possible to suppress the direct exit of the light-emitting device 200A from the light-emitting element 220, thereby realizing a light-emitting device 200A with superior safety.

[0122] As shown in the example in Figure 14, the other end of the wiring 270, one end of which is joined to the light-emitting element 220 at a position close to the protrusion 242t, may be joined to the upper surface of the stepped portion on the side of the light propagation direction from the protrusion 242t. In the illustrated example, the light-emitting device 200A has two wirings 270 that are joined to the upper surface 214a of the first stepped portion 214A and the upper surface 215a of the second stepped portion 215A, respectively, on the side of the light propagation direction from the protrusion 242t. The two wirings 270 are joined to the upper surfaces 214a and 215a of the light incident element 240 so as to pass through the upper surface 240a of the light incident element 240 when viewed from above. By joining the wirings 270 to the upper surfaces 214a and 215a in this way, the movement of the light incident element 240 in the third direction Z can be restricted.

[0123] Furthermore, in the third direction Z, it is preferable that the optical axis OA of the light emitted from the light-emitting element 220 is located at a position lower than half the height H5 between the upper surface 211a and the lower surface 213b of the base 211, with reference to the upper surface 211a of the base 211.

[0124] Light-emitting devices 200 and 200A can be used, for example, in automotive headlights. However, the light-emitting devices 200 and 200A are not limited to this and can be used as light sources for lighting, projectors, head-mounted displays, and backlights for other displays.

[0125] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0126] In addition to the embodiments described above, the following further notes are disclosed. (Note 1) A package having a base, a frame having multiple inner surfaces, and a lid, On the upper surface of the base, surrounded by the frame, is a light-emitting element that emits light having directionality that travels laterally, The upper surface of the base is provided with a light injector, which is surrounded by the frame and positioned to the side of the light-emitting element, and into which the light is incident. The lid portion has at least a portion of a lower surface located above the light incident element and the light-emitting element, In a top view, in a second direction perpendicular to the first direction which is the optical axis direction of the light, the plurality of inner surfaces include the opposing first inner surface and the second inner surface, The light-emitting element is positioned in a first arrangement region located between the first inner surface and the second inner surface. In the second direction, the length of the light incident body is longer than the length between the first inner surface and the second inner surface. In a third direction perpendicular to the upper surface of the base, The height from the upper surface of the base to the upper surface of the light incident element is greater than the height from the upper surface of the base to the upper surface of the light-emitting element. The height from the upper surface of the base to the lower surface of the light incident element is lower than the height from the upper surface of the base to the lower surface of the light-emitting element. The length of the light incident element is longer than the length from the upper surface of the light-emitting element to the lower surface of the cover. The light incident body has a first side surface facing the light-emitting element and a second side surface located on the opposite side of the first side surface. A light-emitting device having a first opposing surface that faces the second side surface and has a space between it and the second side surface. (Note 2) The plurality of inner surfaces include a third inner surface and a fourth inner surface that are opposite to each other in the second direction, The light incident element is positioned in a second arrangement region located between the third inner surface and the fourth inner surface. The light incident body further includes a third side surface and a fourth side surface that intersect with the second side surface and extend in the first direction, The light-emitting device according to Appendix 1, having a second opposing surface facing the third side surface and having a space between it and the third side surface, and a third opposing surface facing the fourth side surface and having a space between it and the fourth side surface. (Note 3) The light-emitting device according to Appendix 2, wherein, in the second direction, the distance between the third inner surface and the fourth inner surface is longer than the distance between the first inner surface and the second inner surface. (Note 4) The light-emitting device according to Appendix 2 or 3, wherein the second opposing surface is the third inner surface, and the third opposing surface is the fourth inner surface. (Note 5) The light-emitting device according to any one of appendices 2 to 4, wherein in the second direction, the length of the space between the second opposing surface and the third side surface, and the length of the space between the third opposing surface and the fourth side surface are 50 μm or more and 400 μm or less. (Note 6) The plurality of inner surfaces further include a fifth inner surface that connects the third inner surface and the fourth inner surface and is located on the opposite side from the light-emitting element, with the light incident element in between. The light-emitting device according to any one of appendices 2 to 5, wherein the fifth inner surface is the first opposing surface. (Note 7) The light-emitting device according to any one of appendices 1 to 6, wherein in the first direction, the length of the space between the first opposing surface and the second side surface is 50 μm or more and 400 μm or less. (Note 8) There is a space between the upper surface and the lower surface of the light incident body. The light-emitting device according to any one of the appendices 1 to 7, wherein in the third direction, the length of the space between the upper surface and the lower surface is 50 μm or more and 400 μm or less. (Note 9) The light-emitting device according to any one of appendices 1 to 8, wherein the light incident element is joined to other members only on its lower surface. (Note 10) The light-emitting device according to any one of appendices 1 to 9, wherein in the first direction, the length of the light incident element is longer than the length of the light-emitting element. (Note 11) A submount is positioned on the upper surface of the base, The light-emitting device according to any one of appendices 1 to 10, wherein the lower surface of the light incident body is joined to the upper surface of the submount via a joining member. (Note 12) The light-emitting device according to Appendix 11, wherein the upper surface of the submount is not located above the lower surface of the light-emitting element. (Note 13) The light incident body further comprises an incident side surface into which the light emitted from the exit end surface of the light-emitting element is incident, and an exit surface from which the light incident on the incident side surface is emitted. The incident surface is located in at least a portion of the first surface, The light incident body further comprises a protrusion extending toward the light-emitting element, The aforementioned protrusion is located above the incident surface and protrudes toward the light-emitting element. The light-emitting device according to any one of appendices 1 to 12, wherein the protruding portion is arranged to overlap with the emission end surface when viewed from above. (Note 14) The light-emitting device according to Appendix 13, wherein in the first direction, the length from the incident side surface to the exit end surface is 400 μm or less. (Note 15) The light-emitting device according to Appendix 13 or 14, wherein the emission surface is provided on the upper surface of the light incident body and emits the incident light upward. (Note 16) The light-emitting device according to any one of appendices 13 to 15, wherein at least a portion of the incident side surface of the light incident body is located below the optical axis of the light emitted from the light-emitting element. [Explanation of Symbols]

[0127] 200, 200A Light-emitting device 210 packages 211 Base 211a Top side 211b Bottom side 211r 1st placement area 211s 2nd placement area 212 Frame section 212a 1st top surface, top surface 212b 1st bottom surface 212c 1st inner surface 212d 2nd inner surface 212e 3rd inner surface 212f 4th inner surface 212g 5th inner surface 212h 6th inner surface 212i outer surface 213 Cover part 213a Upper surface 213b Lower surface 213c Side surface 214 First step shape 214A First step difference part 215 Second step shape 215A Second step difference part 214a Second upper surface, upper surface 214c Side surface 215a Third upper surface, upper surface 215c Side surface 216b Second lower surface 216c Side surface 220 Light-emitting element 220a Emission end face 230, 235 Submount 240 Light incident body 240a Upper surface 240b Lower surface 240c First side surface 240d Second side surface 240e Third side surface 240f Fourth side surface 241 Light incident part 241a Upper surface 241b Lower surface 241c First side surface 241d Second side surface 241e Third side surface 241f Fourth side surface 241i Incident side surface 242 Surrounding part 242t Protruding part<偶000偶551>250 Protection element[[ID=奇0]]<偶000偶552>270 Wiring

Claims

1. A package having a base, a frame having multiple inner surfaces, and a lid, On the upper surface of the base, surrounded by the frame, is a light-emitting element that emits light having directionality that travels laterally, The upper surface of the base is provided with a light injector, which is surrounded by the frame and positioned to the side of the light-emitting element, and into which the light is incident. The lid portion has at least a portion of a lower surface located above the light incident element and the light-emitting element, In a top view, in a second direction perpendicular to the first direction which is the optical axis direction of the light, the plurality of inner surfaces include the opposing first inner surface and the second inner surface, The light-emitting element is positioned in a first arrangement region located between the first inner surface and the second inner surface. In the second direction, the length of the light incident body is longer than the length between the first inner surface and the second inner surface. In a third direction perpendicular to the upper surface of the base, The height from the upper surface of the base to the upper surface of the light incident element is greater than the height from the upper surface of the base to the upper surface of the light-emitting element. The height from the upper surface of the base to the lower surface of the light incident element is lower than the height from the upper surface of the base to the lower surface of the light-emitting element. The length of the light incident element is longer than the length from the upper surface of the light-emitting element to the lower surface of the cover. The light incident body has a first side surface facing the light-emitting element and a second side surface located on the opposite side of the first side surface. A light-emitting device having a first opposing surface that faces the second side surface and has a space between it and the second side surface.

2. The plurality of inner surfaces include a third inner surface and a fourth inner surface that are opposite to each other in the second direction, The light incident element is positioned in a second arrangement region located between the third inner surface and the fourth inner surface. The light incident body further includes a third side surface and a fourth side surface that intersect with the second side surface and extend in the first direction, The light-emitting device according to claim 1, further comprising a second opposing surface facing the third side surface and having a space between it and the third side surface, and a third opposing surface facing the fourth side surface and having a space between it and the fourth side surface.

3. The light-emitting device according to claim 2, wherein in the second direction, the distance between the third inner surface and the fourth inner surface is longer than the distance between the first inner surface and the second inner surface.

4. The light-emitting device according to claim 2, wherein the second opposing surface is the third inner surface, and the third opposing surface is the fourth inner surface.

5. The light-emitting device according to claim 2, wherein in the second direction, the length of the space between the second opposing surface and the third side surface, and the length of the space between the third opposing surface and the fourth side surface are 50 μm or more and 400 μm or less.

6. The plurality of inner surfaces further include a fifth inner surface that connects the third inner surface and the fourth inner surface and is located on the opposite side from the light-emitting element, with the light incident element in between. The light-emitting device according to claim 2, wherein the fifth inner surface is the first opposing surface.

7. The light-emitting device according to claim 1, wherein in the first direction, the length of the space between the first opposing surface and the second side surface is 50 μm or more and 400 μm or less.

8. There is a space between the upper surface of the light incident body and the lower surface of the lid, The light-emitting device according to claim 1, wherein in the third direction, the length of the space between the upper surface and the lower surface of the lid is 50 μm or more and 400 μm or less.

9. The light-emitting device according to claim 1, wherein the light incident element is joined to other members only on its lower surface.

10. The light-emitting device according to claim 1, wherein in the first direction, the length of the light incident element is longer than the length of the light-emitting element.

11. A submount is positioned on the upper surface of the base, The light-emitting device according to claim 1, wherein the lower surface of the light incident body is joined to the upper surface of the submount via a joining member.

12. The light-emitting device according to claim 11, wherein the upper surface of the submount is not located above the lower surface of the light-emitting element.

13. The light incident body further comprises an incident side surface into which the light emitted from the exit end surface of the light-emitting element is incident, and an exit surface from which the light incident on the incident side surface is emitted. The incident surface is located in at least a portion of the first surface, The light incident body further comprises a protrusion extending toward the light-emitting element, The aforementioned protrusion is located above the incident surface and protrudes toward the light-emitting element. The light-emitting device according to any one of claims 1 to 12, wherein the protruding portion is arranged to overlap with the emission end surface when viewed from above.

14. The light-emitting device according to claim 13, wherein in the first direction, the length from the incident side surface to the exit end surface is 400 μm or less.

15. The light-emitting device according to claim 13, wherein the emission surface is provided on the upper surface of the light incident body and emits the incident light upward.

16. The light-emitting device according to claim 13, wherein at least a portion of the incident side surface of the light incident body is located below the optical axis of the light emitted from the light-emitting element.

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