Light emitting device and light emitting module

Abstract

To provide a light emitting device which can be miniaturized.SOLUTION: The present light emitting device contains: a base part; a first light emitting element that emits a first light from a first light emission surface; and a second light emitting element that emits a second light from a second light emission surface. Each of them comprises: a plurality of light emitting elements arranged onto an upper surface of the base part; and one or a plurality of reflection members that is arranged onto the upper surface of the base part, and reflects the first light and the second light in an upper direction. One or the plurality of reflection members includes: a first reflection surface reflecting the first light; a second reflection surface reflecting the upper direction of the first light reflected by the first reflection surface; and a third reflection surface reflecting the second light. The first light emitted from the first light emission surface, and progressing to the first reflection surface contains a light progressed in a first direction which is parallel to an upper surface of the base part, and the light is reflected by the first reflection surface. The first light progressed to the second reflection surface contains a light which is parallel to the upper surface of the base part, and is progressed in a second direction which is vertical to the first direction.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a light emitting device and a light emitting module. [Background technology]

[0002] Patent Document 1 discloses an LD module having multiple laser diodes and multiple mirrors arranged on the upper surface of a substrate. In this LD module, the light emitted from each laser diode is collimated by a collimating lens, and then reflected twice by mirrors to travel in a direction parallel to the upper surface of the substrate and enter an optical fiber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-031739 Summary of the Invention [Problem to be solved by the invention]

[0004] In the LD module of Patent Document 1, the mirrors are arranged offset so that the laser light does not interfere with the mirrors.

[0005] An object of the present disclosure is to provide a light emitting device that can be miniaturized, and also to provide a light emitting module that includes this light emitting device. [Means for solving the problem]

[0006] A light emitting device according to one embodiment of the present disclosure includes a base, a first light emitting element that emits first light from a first emission surface, and a second light emitting element that emits second light from a second emission surface, each of the light emitting elements being arranged on an upper surface of the base, and one or more reflecting members that are arranged on the upper surface of the base and reflect the first light and the second light upward, the one or more reflecting members having a first reflecting surface that reflects the first light, a second reflecting surface that reflects the first light reflected by the first reflecting surface upward, and a third reflecting surface that reflects the second light, wherein the first light that is emitted from the first emission surface and travels toward the first reflecting surface includes light traveling in a first direction that is parallel to the upper surface of the base, and the first light that is reflected by the first reflecting surface and travels toward the second reflecting surface includes light traveling in a second direction that is parallel to the upper surface of the base and perpendicular to the first direction.

[0007] Furthermore, an optical module according to an embodiment of the present disclosure comprises an optical device according to an embodiment of the present disclosure and a light guide plate arranged above the optical device, and light emitted from the optical device is emitted to the light guide plate. [Effects of the Invention]

[0008] According to an embodiment of the present disclosure, it is possible to provide a light emitting device that can be miniaturized, and also to provide a light emitting module including the light emitting device. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view illustrating a light emitting device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the light emitting device according to the embodiment with the cover removed. [Figure 3] FIG. 2 is a top view of the light emitting device according to the embodiment with the cover removed. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 3, illustrating the light-emitting device according to the embodiment. [Figure 5] 4A and 4B are diagrams illustrating the positional relationship between the reflecting surfaces of the reflecting member. [Figure 6] FIG. 1 is a diagram (part 1) for explaining how light emitted from each light-emitting element travels. [Figure 7] FIG. 2 is a diagram (part 2) for explaining how light emitted from each light-emitting element travels. [Figure 8] 10 is a diagram schematically illustrating light emitted to the outside from the top surface of the lid member. FIG. [Figure 9] FIG. 1 is a perspective view (part 1) illustrating a light-emitting module including a light-emitting device. [Figure 10] FIG. 1 is a side view (part 1) illustrating a light-emitting module including a light-emitting device. [Figure 11] FIG. 2 is a perspective view (part 2) illustrating a light-emitting module including a light-emitting device. [Figure 12] FIG. 2 is a side view (part 2) illustrating a light-emitting module including a light-emitting device. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the invention will be described with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "upper," "lower," and other terms including these terms) will be used as necessary. However, the use of these terms is intended to facilitate understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Furthermore, parts that appear with the same reference numerals in multiple drawings indicate the same or equivalent parts or components.

[0011] Furthermore, in this disclosure, polygons such as triangles and quadrilaterals are referred to as polygons, including shapes in which the corners of the polygons have been processed, such as by rounding, chamfering, corner removal, or rounding. Shapes in which processing has been applied not only to the corners (edges of the sides) but also to the middle portions of the sides are also referred to as polygons. In other words, shapes in which partial processing has been applied while retaining the polygon as a base are included in the interpretation of "polygon" described in this disclosure.

[0012] The same applies to words that represent specific shapes, such as trapezoids, circles, and irregularities, not just polygons. The same also applies when dealing with the sides that form the shape. In other words, even if the corners or middle part of a side have been processed, the interpretation of "side" includes the processed part. Note that when distinguishing a "polygon" or "side" that has no processing from a processed shape, the word "strict" is added, for example, "strict quadrangle."

[0013] Furthermore, the embodiments shown below are intended to exemplify light-emitting devices and the like embodying the technical concepts of the present invention, and are not intended to limit the present invention thereto. Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described below are intended for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, the content described in one embodiment may also be applicable to other embodiments and modified examples. Furthermore, the size and positional relationships of components shown in the drawings may be exaggerated for clarity. Furthermore, to avoid overly complex drawings, schematic diagrams may be used in which some elements are omitted, or end views may be used as cross-sectional views showing only the cut surface.

[0014] [Light-emitting device] The light emitting device according to this embodiment includes at least a base, a plurality of light emitting elements disposed on an upper surface of the base, and one or more reflecting members disposed on the upper surface of the base. The plurality of light emitting elements include at least a first light emitting element and a second light emitting element. The one or more reflecting members each have a first reflecting surface that reflects first light emitted by the first light emitting element, a second reflecting surface that reflects the first light reflected by the first reflecting surface upward, and a third reflecting surface that reflects second light emitted by the second light emitting element.

[0015] An example of a light emitting device according to this embodiment will be described below with reference to FIGS. 1 to 4. FIG. 1 is a perspective view illustrating the light emitting device according to this embodiment. FIG. 2 is a perspective view illustrating the light emitting device according to this embodiment with a lid member removed. FIG. 3 is a top view illustrating the light emitting device according to this embodiment with the lid member removed. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, illustrating the light emitting device according to this embodiment. Note that the wiring 270 shown in FIG. 3 is omitted in FIGS. 2 and 4.

[0016] The illustrated light emitting device 200 is an example of a light emitting device according to this embodiment. The light emitting device 200 includes a package 210 including a base 211, a frame 212, and a cover member 213, a plurality of light emitting elements 220, one or more submounts 230 supporting the plurality of light emitting elements, one or more reflecting members 240, a protective element 250, and wiring 270.

[0017] Each component of the light emitting device 200 will be described.

[0018] (Package 210) The base 211 has an upper surface 211a and a lower surface 211b. The base 211 has, for example, a rectangular outer shape when viewed from above.

[0019] The frame portion 212 has an upper surface 212a, a lower surface 212b, one or more inner surfaces 212c, and one or more outer surfaces 212d. The frame portion 212 has, for example, a rectangular frame shape when viewed from above. The one or more inner surfaces 212c of the frame portion 212 have inner surfaces 212c that intersect with the upper surface 211a of the base portion 211. The one or more inner surfaces 212c of the frame portion 212 surround at least a portion of the upper surface 211a of the base portion 211 and reach above the upper surface 211a. The lower surface 212b of the frame portion 212 is, for example, located on the same plane as the lower surface 211b of the base 211.

[0020] 1 to 4, the direction indicated by arrow X is the first direction, the direction indicated by arrow Y is the second direction, and the direction indicated by arrow Z is the third direction. The second direction Y is perpendicular to the first direction X. The third direction Z is perpendicular to the first direction X and the second direction Y. 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. The first direction X and the second direction Y are parallel to or perpendicular to, for example, one of the inner surfaces 212c of the frame 212 in a top view. This also applies to the subsequent figures.

[0021] The base 211 and the frame 212 have a concave shape recessed from the upper surface 212a of the frame 212 toward the upper surface 211a of the base 211. The concave shape is formed inside the outer shape of the frame 212 when viewed from above. When viewed from above, the upper surface 211a of the base 211 is surrounded by a frame formed by one or more inner surfaces 212c of the frame 212. The base 211 and the frame 212 can be formed integrally. Alternatively, the base 211 and the frame 212 may be formed separately and then joined together. Note that a top view refers to viewing an object from the normal direction of the upper surface 211a of the base 211.

[0022] The frame portion 212 may have one or more step portions 214 connected along two opposing sides in a top view. In the example shown, the step portions 214 are provided along two opposing sides of the four sides connecting the top surface 212a and the inner side surface 212c of the frame portion 212 in a top view, and along one side connecting these two sides. No step portion 214 is provided along the other side connecting the two opposing sides. However, the step portions 214 may be provided along all four sides connecting the top surface 212a and the inner side surface 212c of the frame portion 212 in a top view, or may be provided along only one set of two opposing sides. The step portion 214 is, for example, composed only of the top surface 214a and a side surface that intersects with the top surface 214a and extends downward.

[0023] An upper surface 214a of the step portion 214 is located above an upper surface 211a of the base portion 211 and below an upper surface 212a of the frame portion 212. The one or more inner surfaces 212c of the frame portion 212 include a side surface intersecting with the upper surface 212a of the frame portion 212 and a side surface of the step portion 214.

[0024] The stepped portion 214 may have wiring regions 216 on its upper surface 214a along two opposing sides extending in the first direction X with the plurality of light-emitting elements sandwiched therebetween. In the illustrated example, the stepped portion 214 further has a wiring region 216 on its upper surface 214a along one side extending in the second direction Y. Each wiring region 216 is provided with, for example, one or more metal films. One or more metal films may also be provided on the upper surface 212a and the lower surface 212b of the frame portion 212. The one or more metal films provided on the upper surface 214a of the stepped portion 214 may include a metal film electrically connected to a metal film provided on the lower surface 212b. However, the one or more metal films provided on the upper surface 214a of the stepped portion 214 may also include a metal film electrically connected to a metal film provided on the upper surface 212a. The metal film may be, for example, Ni / Au (a metal film in which Ni and Au are laminated in this order) or Ti / Pt / Au (a metal film in which Ti, Pt, and Au are laminated in this order).

[0025] The lid member 213 has an upper surface 213a, a lower surface, and one or more side surfaces that intersect with the upper surface 213a and the lower surface. The one or more side surfaces connect the outer edge of the upper surface 213a to the outer edge of the lower surface. The lid member 213 is, for example, a rectangular parallelepiped or a cube.

[0026] The shape of the cover member 213 is not limited to a rectangular parallelepiped or a cube. That is, the cover member 213 is not limited to a rectangular shape when viewed from above, but can be any shape such as a circle, an ellipse, or a polygon.

[0027] Lid member 213 is supported by frame portion 212 and is disposed above upper surface 211a of base portion 211. The outer periphery of the lower surface of lid member 213 is joined to, for example, upper surface 212a of frame portion 212. By joining lid member 213 to frame portion 212, a closed space is formed inside package 210.

[0028] The base 211 can be formed, for example, from a metal, and the frame 212 can be formed, for example, from a ceramic as a main material. An example of a metal that forms the base 211 is copper. Furthermore, aluminum nitride, silicon nitride, aluminum oxide, or silicon carbide can be used as a ceramic that forms the frame 212. The main materials that form the base 211 and the frame 212 are not limited to these, and the base 211 may be formed from a ceramic, and the frame 212 from a metal. Both the base 211 and the frame 212 may be formed from a ceramic, or both may be formed from a metal. The base 211 and the frame 212 may be formed from other insulating materials as a main material, not limited to metal or ceramic.

[0029] Lid member 213 has a light-transmitting portion in at least a portion thereof through which light of a predetermined wavelength passes. Lid member 213 can be formed primarily from a light-transmitting material such as sapphire, quartz, silicon carbide, or glass. In the example shown, lid member 213 has a metal film provided on the bonding surface with upper surface 212a of frame 212. Lid member 213 may also have a metal film provided so as to have only a portion thereof that is light-transmitting.

[0030] (light-emitting element 220) The light emitting element 220 is, for example, a semiconductor laser element. The light emitting element 220 is not limited to a semiconductor laser element, and may be, for example, a light emitting diode (LED) or an organic light emitting diode (OLED).

[0031] The light emitting element 220 has, for example, a rectangular outer shape when viewed from above. A side surface intersecting one of the two short sides of the rectangle serves as an emission surface for light emitted from the light emitting element 220. The upper and lower surfaces of the light emitting element 220 have areas larger than the emission surface.

[0032] Here, a case where the light emitting element 220 is a semiconductor laser element will be described. Note that the light (laser light) emitted from the light emitting element 220 has a spread and forms an elliptical far-field pattern (hereinafter referred to as "FFP") on a plane parallel to the emission surface. Here, FFP refers to the shape and light intensity distribution of the emitted light at a position away from the emission surface.

[0033] 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, based on the elliptical light emitted from the light emitting element 220. The fast axis direction of the FFP in the light emitting element 220 can coincide with the stacking direction in which multiple semiconductor layers including the active layer of the light emitting element 220 are stacked.

[0034] Furthermore, based on the light intensity distribution of the FFP of the light emitting element 220, 1 / e 2 The light having an intensity of 1 / e or more is called the main part of the light. 2 The angle corresponding to the intensity of the FFP is called the divergence angle. The divergence angle in the fast axis direction of the FFP is larger than the divergence angle in the slow axis direction of the FFP.

[0035] Furthermore, the light passing through the center of the elliptical shape of the FFP, in other words, the light with the peak intensity in the light intensity distribution of the FFP, is referred to as the light traveling along the optical axis or the light passing through the optical axis. Also, the optical path of the light traveling along the optical axis is referred to as the optical axis of that light.

[0036] For example, a semiconductor laser element that emits blue light, a semiconductor laser element that emits green light, or a semiconductor laser element that emits red light can be used as the light emitting element 220. Also, a semiconductor laser element that emits light other than these may be used.

[0037] Here, blue light refers to light whose peak emission wavelength is in the range of 420 nm to 494 nm, green light refers to light whose peak emission wavelength is in the range of 495 nm to 570 nm, and red light refers to light whose peak emission wavelength is in the range of 605 nm to 750 nm.

[0038] Examples of semiconductor laser elements that emit blue light or green light include semiconductor laser elements that contain nitride semiconductors. Examples of nitride semiconductors that can be used include GaN, InGaN, and AlGaN. Examples of semiconductor laser elements that emit red light include those that contain InAlGaP-based, GaInP-based, GaAs-based, and AlGaAs-based semiconductors.

[0039] (Submount 230) The submount 230 is, for example, shaped like a rectangular parallelepiped and has a bottom surface, a top surface, and one or more side surfaces. The width of the submount 230 in the up-down direction (third direction Z) is smaller than the width in the front-rear direction (first direction X) and the width in the left-right direction (second direction Y). The shape of the submount 230 is not limited to a rectangular parallelepiped. The submount 230 is formed using, for example, aluminum nitride or silicon carbide, but other materials may also be used. A metal film, for example, is provided on the top surface of the submount 230.

[0040] (Reflective member 240) The reflecting member 240 has one or more reflecting surfaces. The one or more reflecting members 240 provide multiple reflecting surfaces. In the example shown in FIGS. 1 to 4, the light emitting device 200 has multiple reflecting members 240. The multiple reflecting members 240 include a first reflecting member 240A, a second reflecting member 240B, a third reflecting member 240C, and a fourth reflecting member 240D.

[0041] The following describes first reflecting member 240A to fourth reflecting member 240D. Note that it is also possible to realize a single reflecting member 240 in which a plurality or all of first reflecting member 240A to fourth reflecting member 240D are integrally formed. Therefore, the following description of each reflecting member 240 from first reflecting member 240A to fourth reflecting member 240D also describes one or more reflecting members 240. In other words, for example, the characteristics of first reflecting member 240A can also be said to be the characteristics of one or more reflecting members 240.

[0042] In the following description of first reflecting member 240A, second reflecting member 240B, third reflecting member 240C, and fourth reflecting member 240D, parallel and perpendicular include a difference of ±5 degrees. Furthermore, when a specific angle such as an inclination angle is mentioned, a difference of ±5 degrees from the specific angle is included in consideration of manufacturing precision.

[0043] First reflecting member 240A has an upper surface 247, a lower surface, and a plurality of side surfaces intersecting with upper surface 247 and the lower surface. In the illustrated light emitting device 200, upper surface 247, the lower surface, and the plurality of side surfaces are all flat surfaces. Upper surface 247 and the lower surface are parallel to each other. Furthermore, the lower surface has the same area as upper surface 247. However, the positional relationship between upper surface 247 and the lower surface and the size of the areas are not limited to this.

[0044] The multiple side surfaces include first reflecting surfaces 241 that reflect incident light. The multiple side surfaces may include side surfaces that are non-parallel to one another. In the illustrated light emitting device 200, the top surface 247 is a substantially right-angled triangle, and the first reflecting surfaces 241 are rectangular. The top surface 247 may also be a right-angled isosceles triangle. The first reflecting surfaces 241 are perpendicular to the bottom surface and intersect with the long side of the top surface 247.

[0045] Note that the top surface 247, the bottom surface, and the multiple side surfaces may each be curved, or may be a mixture of flat and curved surfaces. Furthermore, the top surface 247 does not have to be triangular, and may be, for example, a polygon with four or more sides, a semicircle, or the like. Furthermore, the first reflecting surface 241 does not have to be rectangular as long as it can reflect incident light in a desired direction.

[0046] The second reflecting member 240B has an upper surface 248, a lower surface, and a plurality of side surfaces intersecting the upper surface 248 and the lower surface. In the illustrated light emitting device 200, the upper surface 248, the lower surface, and the plurality of side surfaces are all flat surfaces. The upper surface 248 and the lower surface are parallel to each other. The lower surface has a larger area than the upper surface 248. However, the positional relationship between the upper surface 248 and the lower surface and the size of the areas are not limited to this.

[0047] The multiple side surfaces include a second reflecting surface 242 that reflects incident light and a third reflecting surface 243 that reflects incident light. The multiple side surfaces also include two side surfaces that face each other across the second reflecting surface 242 in top view. The two side surfaces that face each other across the second reflecting surface 242 have different areas.

[0048] In the illustrated light emitting device 200, the top surface 248 is a right triangle, and the second reflecting surface 242 and the third reflecting surface 243 are rectangular. The top surface 248 may be a right isosceles triangle. In top view, one of the two sides other than the long side of the top surface 248, which is a right triangle, intersects with a side of the second reflecting surface 242 and has the same length. The side where the top surface 248 and the second reflecting surface 242 intersect is the boundary between the top surface 248 and the second reflecting surface 242. In top view, the boundary between the top surface 248 and the second reflecting surface 242 is within an area surrounded by the outer periphery of the bottom surface, and is between the side of the bottom surface that intersects with the second reflecting surface 242 and the third reflecting surface 243.

[0049] Second reflecting surface 242 is inclined with respect to the lower surface. The inclination angle of second reflecting surface 242 with respect to the lower surface is, for example, 45 degrees. Third reflecting surface 243 is perpendicular to the lower surface and intersects with the long side of upper surface 248. That is, in a top view, third reflecting surface 243 is inclined with respect to a plane that passes through the boundary between upper surface 248 and second reflecting surface 242 and is perpendicular to the lower surface. The inclination angle of third reflecting surface 243 with respect to a plane that passes through the boundary between upper surface 248 and second reflecting surface 242 and is perpendicular to the lower surface is, for example, 45 degrees.

[0050] Note that top surface 248, bottom surface, and multiple side surfaces may each be curved, or may be a mixture of flat and curved surfaces. Second reflecting surface 242 and third reflecting surface 243 do not have to be rectangular as long as they can reflect incident light in a desired direction. In second reflecting member 240B, the portion including second reflecting surface 242 and the portion including third reflecting surface 243 may be integral with or separate from each other.

[0051] The third reflecting member 240C has an upper surface 249, a lower surface, and a plurality of side surfaces intersecting with the upper surface 249 and the lower surface. In the illustrated light emitting device 200, the upper surface 249, the lower surface, and the plurality of side surfaces are all flat surfaces. The upper surface 249 and the lower surface are parallel to each other. The lower surface has a larger area than the upper surface 249. However, the positional relationship between the upper surface 249 and the lower surface and the size of the areas are not limited to this.

[0052] The multiple side surfaces include a fourth reflecting surface 244 that reflects incident light and a fifth reflecting surface 245 that reflects incident light. The multiple side surfaces also include two side surfaces that face each other across the fourth reflecting surface 244 in top view. The two side surfaces that face each other across the fourth reflecting surface 244 have different areas.

[0053] In the illustrated light emitting device 200, the top surface 249 is a right triangle, and the fourth reflecting surface 244 and the fifth reflecting surface 245 are rectangular. The top surface 249 may be a right isosceles triangle. In top view, one of the two sides other than the long side of the top surface 249 intersects with a side of the fourth reflecting surface 244 and has the same length. The side where the top surface 249 intersects with the fourth reflecting surface 244 forms the boundary between the top surface 249 and the fourth reflecting surface 244. In top view, the boundary between the top surface 249 and the fourth reflecting surface 244 is within an area surrounded by the outer periphery of the bottom surface, and is between the side of the bottom surface that intersects with the fourth reflecting surface 244 and the fifth reflecting surface 245.

[0054] Fourth reflecting surface 244 is inclined with respect to the lower surface. The inclination angle of fourth reflecting surface 244 with respect to the lower surface is, for example, 45 degrees. Fifth reflecting surface 245 is perpendicular to the lower surface and intersects with the long side of upper surface 249. That is, in a top view, fifth reflecting surface 245 is inclined with respect to a plane that passes through the boundary between upper surface 249 and fourth reflecting surface 244 and is perpendicular to the lower surface. The inclination angle of fifth reflecting surface 245 with respect to a plane that passes through the boundary between upper surface 249 and fourth reflecting surface 244 and is perpendicular to the lower surface is, for example, 45 degrees.

[0055] Note that top surface 249, bottom surface, and multiple side surfaces may each be curved, or may be a mixture of flat and curved surfaces. Furthermore, fourth reflecting surface 244 and fifth reflecting surface 245 do not have to be rectangular as long as they can reflect incident light in the desired direction. Third reflecting member 240C may have exactly the same shape as second reflecting member 240B. Furthermore, in third reflecting member 240C, the portion including fourth reflecting surface 244 and the portion including fifth reflecting surface 245 may be integral or separate.

[0056] Fourth reflecting member 240D has a lower surface, a sixth reflecting surface 246 that reflects incident light, and a plurality of side surfaces that intersect with sixth reflecting surface 246 and the lower surface. In the illustrated light emitting device 200, the lower surface, sixth reflecting surface 246, and the plurality of side surfaces are all flat surfaces.

[0057] The plurality of side surfaces includes two side surfaces that face each other across the sixth reflecting surface 246 in top view. The plurality of side surfaces also includes one side surface that intersects with the two side surfaces that face each other across the sixth reflecting surface 246 in top view. The two side surfaces that face each other across the sixth reflecting surface 246 may have the same area.

[0058] In the illustrated light emitting device 200, the sixth reflecting surface 246 is rectangular. The sixth reflecting surface 246 is inclined with respect to the lower surface. The inclination angle of the sixth reflecting surface 246 with respect to the lower surface is, for example, 45 degrees.

[0059] The lower surface and the sixth reflecting surface 246 may each be a curved surface, or may be a mixture of flat and curved surfaces. Furthermore, the sixth reflecting surface 246 does not have to be rectangular as long as it can reflect incident light in a desired direction.

[0060] The first reflecting member 240A, the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D can be primarily formed of glass, metal, or the like. The primary material is preferably a heat-resistant material, such as glass, such as quartz or BK7 (borosilicate glass), a metal, such as aluminum, or Si. The first reflecting surface 241, the second reflecting surface 242, the third reflecting surface 243, the fourth reflecting surface 244, the fifth reflecting surface 245, and the sixth reflecting surface 246 can be formed of, for example, a metal, such as Ag or Al, or a dielectric multilayer film, such as Ta2O5 / SiO2, TiO2 / SiO2, or Nb2O5 / SiO2.

[0061] (protective element 250) The protective element 250 is intended to prevent damage caused by excessive current flowing through a specific element, such as a semiconductor laser element. A Zener diode made of Si can be used as the protective element 250. Alternatively, the protective element 250 can 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 disposed near the light-emitting surface of the light-emitting element 220.

[0062] (Wiring 270) The wiring 270 is made 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 that are joined to other components. The wiring 270 is used for electrical connection between two components. For example, a metal wire can be used as the wiring 270. Examples of metals include gold, aluminum, silver, and copper.

[0063] (Light emitting device 200) Next, the light emitting device 200 will be described.

[0064] In the example of the light emitting device 200 described below, each of the plurality of light emitting elements 220 is a semiconductor laser element. In the example shown, the plurality of light emitting elements 220 includes a first light emitting element 220A, a second light emitting element 220B, and a third light emitting element 220C. However, the light emitting device 200 may be provided with two light emitting elements 220, or with four or more light emitting elements 220.

[0065] The first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C emit, for example, a first light L1 of red, a second light L2 of blue, and a third light L3 of green, respectively. A light-emitting device 200 including three light-emitting elements that respectively emit red light, blue light, and green light may be suitable for applications such as laser TVs and head-mounted displays. However, the color of light emitted by the multiple light-emitting elements 220 is not limited thereto and may be, for example, red, blue, green, or other colors, and each light-emitting element may be a light-emitting element that emits light of any color. Furthermore, depending on the application, the device may include multiple light-emitting elements that emit light of the same color.

[0066] Here, the first light L1, the second light L2, and the third light L3 refer to the "main part of light" when the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C are each a semiconductor laser element.

[0067] In the base 211, multiple submounts 230 are disposed on the upper surface 211a. In the illustrated example, multiple light-emitting elements 220 are disposed on the upper surface of each submount 230. That is, at least the same number of submounts 230 as the number of light-emitting elements provided in the light-emitting device 200 are disposed on the upper surface 211a. In the illustrated light-emitting device 200, three submounts 230 are disposed. However, multiple light-emitting elements 220 may be disposed on one submount 230. The lower surface of the submount 230 is bonded, for example, to the upper surface of a metal film formed on the upper surface 211a of the base 211. Note that the light-emitting device 200 according to this embodiment does not necessarily have submounts. For example, multiple light-emitting elements 220 may be disposed directly on the upper surface 211a of the base 211, or a protrusion may be provided at a position where the multiple light-emitting elements 220 are to be disposed, and the multiple light-emitting elements 220 may be disposed on the upper surface of the protrusion.

[0068] In the light emitting device 200, a plurality of light emitting elements 220 are arranged on the upper surface 211a of the base 211. In the illustrated example of the light emitting device 200, the first light emitting element 220A, the second light emitting element 220B, and the third light emitting element 220C are arranged spaced apart from each other in the second direction Y in the order of the first light emitting element 220A, the second light emitting element 220B, and the third light emitting element 220C, with their longitudinal directions facing the first direction X.

[0069] The plurality of light-emitting elements 220 are each disposed on the upper surface 211a via a submount 230. The plurality of light-emitting elements 220 are disposed such that their emission surfaces face one side of the submount 230 on which they are disposed. The plurality of light-emitting elements 220 are disposed such that their emission surfaces face the same side. In the illustrated example, the first emission surface 221, the second emission surface 222, and the third emission surface 223 of the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C, respectively, are all disposed such that they face the first direction X. The first emission surface 221, the second emission surface 222, and the third emission surface 223 may be on the same plane. Here, "on the same plane" allows for a deviation of ±50 μm in the first direction X.

[0070] One of the side surfaces intersecting with the emission surface of one of the plurality of light-emitting elements 220 faces one of the side surfaces intersecting with the emission surface of the other light-emitting element. In the illustrated example, one of the side surfaces intersecting with the first emission surface 221 of the first light-emitting element 220A faces one of the side surfaces intersecting with the second emission surface 222 of the second light-emitting element 220B. Furthermore, the other of the side surfaces intersecting with the second emission surface 222 of the second light-emitting element 220B faces one of the side surfaces intersecting with the third emission surface 223 of the third light-emitting element 220C. The two side surfaces intersecting with the first emission surface 221 of the first light-emitting element 220A, the two side surfaces intersecting with the second emission surface 222 of the second light-emitting element 220B, and the two side surfaces intersecting with the third emission surface 223 of the third light-emitting element 220C are, for example, parallel to the first direction X in a top view.

[0071] In the illustrated example, for the wiring regions 216 along the two sides extending in the first direction X, the wiring region closer to the first light-emitting element 220A is called the first wiring region 216A, and the wiring region closer to the third light-emitting element 220C is called the second wiring region 216B. Also, the wiring region located on the top surface 214a along one side extending in the second direction Y is called the third wiring region 216C.

[0072] A plurality of wires 270 that connect to the plurality of light emitting elements 220 are bonded to a plurality of metal films provided in the wiring region 216 of the frame portion 212 .

[0073] 3, a plurality of wirings 270 connected to the first light-emitting element 220A are bonded to the metal film provided in the first wiring region 216A. A plurality of wirings 270 connected to the third light-emitting element 220C are bonded to the metal film provided in the second wiring region 216B. A wiring 270 connected to the second light-emitting element 220B is bonded to the metal film provided in the third wiring region 216C. Similarly, a wiring 270 connected to the third light-emitting element 220C is bonded to the metal film provided in the third wiring region 216C. In the illustrated example, the wiring 270 connected to the third light-emitting element 220C is bonded to the second wiring region 216B and the third wiring region 216C, but it may be bonded only to the second wiring region 216B.

[0074] Furthermore, of the two sides extending in the second direction Y, the wiring region 216 is not provided on the side along which light emitted from the plurality of light emitting elements 220 travels. The wiring region 216 is preferably arranged so that the wiring 270 does not interfere with the light emitted from the light emitting elements 220.

[0075] The illustrated wiring pattern is merely an example, and the wiring region 216 may be provided only along two sides extending in the first direction X. In that case, the wiring 270 connected to one of the light-emitting elements 220 is joined to the metal film provided in the first wiring region 216A, and the wiring 270 connected to the other light-emitting element 220 is joined to the metal film provided in the second wiring region 216B.

[0076] Furthermore, in the illustrated example, the multiple metal films provided in the wiring region 216 are provided in the order of the first wiring region 216A, the third wiring region 216C, and the second wiring region 216B as a first metal film, a second metal film, a third metal film, a fourth metal film, a fifth metal film, and a sixth metal film.

[0077] One or more protective elements 250 are further arranged on the upper surface 214a of the step portion 214. A plurality of protective elements 250 corresponding to the plurality of light-emitting elements 220 are arranged across the two metal films on the upper surface 214a along two sides extending in the first direction X and one side connected to the two sides and extending in the second direction Y.

[0078] In the illustrated example, the first protective element 250A corresponding to the first light-emitting element 220A is disposed across the first and second metal films. The second protective element 250B corresponding to the second light-emitting element 220B is disposed across the third and fourth metal films. The third protective element 250C corresponding to the third light-emitting element 220C is disposed across the fifth and sixth metal films. The boundaries between the first and second metal films and the boundary between the fifth and sixth metal films extend in a direction (second direction) perpendicular to the direction in which the step portion extends (first direction X), while the boundary between the third and fourth metal films extends in a direction (second direction Y) parallel to the direction in which the step portion extends (second direction Y). The first, second, and third protective elements 250A, 250B, and 250C are disposed across their respective boundaries.

[0079] In this way, by arranging the second protection element 250B so that it straddles a boundary that extends in a direction parallel to the extension direction of the step portion, the short side direction of the second protection element 250B can be aligned with the extension direction of the step portion, enabling more efficient wiring.

[0080] In the light emitting device 200, one or more reflective members 240 are disposed on the upper surface 211a of the base 211. The one or more reflective members 240 have a first reflective surface 241, a second reflective surface 242, and a third reflective surface 243. In the example shown, the one or more reflective members 240 further have a fourth reflective surface 244, a fifth reflective surface 245, and a sixth reflective surface 246. In the light emitting device 200, one reflective member may include the first reflective surface 241, the second reflective surface 242, and the third reflective surface 243, or the first reflective surface 241, the second reflective surface 242, and the third reflective surface 243 may be configured by a plurality of reflective members. In addition, one reflecting member may further include a fourth reflecting surface 244, a fifth reflecting surface 245, and a sixth reflecting surface 246, or the fourth reflecting surface 244, the fifth reflecting surface 245, and the sixth reflecting surface 246 may be formed by multiple reflecting members 240.

[0081] In the illustrated example of light emitting device 200, first reflecting member 240A, second reflecting member 240B, third reflecting member 240C, and fourth reflecting member 240D, which are independent of one another, are arranged on upper surface 211a of base 211. First reflecting member 240A, second reflecting member 240B, third reflecting member 240C, and fourth reflecting member 240D are arranged side by side in second direction Y. First reflecting surface 241, second reflecting surface 242, third reflecting surface 243, fourth reflecting surface 244, fifth reflecting surface 245, and sixth reflecting surface 246 are arranged at positions where a straight line S0, which is a virtual line parallel to second direction Y, passes when viewed from above, as shown in FIG.

[0082] In the illustrated example of light emitting device 200, a first reflecting member 240A including a first reflecting surface 241, a second reflecting member 240B including a second reflecting surface 242 and a third reflecting surface 243, a third reflecting member 240C including a fourth reflecting surface 244 and a fifth reflecting surface 245, and a fourth reflecting member 240D including a sixth reflecting surface 246 are arranged on the upper surface 211a of base 211. Since second reflecting member 240B includes second reflecting surface 242 and third reflecting surface 243, second reflecting surface 242 and third reflecting surface 243 can be arranged close to each other, thereby reducing the size of light emitting device 200 in the second direction Y. Furthermore, since third reflecting member 240C includes fourth reflecting surface 244 and fifth reflecting surface 245, fourth reflecting surface 244 and fifth reflecting surface 245 can be arranged close to each other, thereby reducing the size of light emitting device 200 in the second direction Y. However, the light emitting device 200 in this embodiment is not limited to this, and may be, for example, a light emitting device having six reflective members, each having one reflective surface, individually arranged on the upper surface 211a of the base 211.

[0083] The first reflecting surface 241 faces the direction of the first exit surface 221 of the first light-emitting element 220A. That is, as shown in FIG. 5 , the first reflecting surface 241 is disposed at a position where a first straight line S1, which is a virtual line that passes through the first exit surface 221 of the first light-emitting element 220A and is perpendicular to the first exit surface 221, passes through in a top view. When the light emitted by the first light-emitting element 220A has a divergence like that of a semiconductor laser element, by disposing the first reflecting surface 241 as described above, it is possible to prevent the first reflecting surface 241 from becoming unnecessarily large even when the first reflecting surface 241 is sized to reflect all of the first light L1, which is a major portion of the light. In a top view, the first reflecting surface 241 is non-parallel to the first direction X and the second direction Y. That is, the first reflecting surface 241 is non-parallel to the first exit surface 221 of the first light-emitting element 220A in a top view. In top view, the first reflecting surface 241 is inclined at, for example, 45 degrees with respect to the first emission surface 221 of the first light emitting element 220A.

[0084] The third reflecting surface 243 faces the direction of the second exit surface 222 of the second light-emitting element 220B. That is, as shown in FIG. 5 , the third reflecting surface 243 is disposed at a position where a second straight line S2, which is a virtual line that passes through the second exit surface 222 of the second light-emitting element 220B and is perpendicular to the second exit surface 222, passes through in a top view. When the light emitted by the second light-emitting element 220B has a divergence like that of a semiconductor laser element, by disposing the third reflecting surface 243 as described above, it is possible to prevent the third reflecting surface 243 from becoming unnecessarily large even when the third reflecting surface 243 is sized to reflect all of the second light L2, which is a major portion of the light. In a top view, the third reflecting surface 243 is non-parallel to the first direction X and the second direction Y. That is, the third reflecting surface 243 is non-parallel to the second exit surface 222 of the second light-emitting element 220B in a top view. In top view, the third reflecting surface 243 is inclined at, for example, 45 degrees with respect to the second emission surface 222 of the second light emitting element 220B.

[0085] The fifth reflecting surface 245 faces the direction of the third exit surface 223 of the third light-emitting element 220C. That is, as shown in FIG. 5 , the fifth reflecting surface 245 is disposed at a position where a third straight line S3, which is a virtual line that passes through the third exit surface 223 of the third light-emitting element 220C and is perpendicular to the third exit surface 223, passes through in a top view. When the light emitted by the third light-emitting element 220C has a divergence like that of a semiconductor laser element, by disposing the fifth reflecting surface 245 as described above, it is possible to prevent the fifth reflecting surface 245 from becoming unnecessarily large even when the fifth reflecting surface 245 is sized to reflect all of the third light L3, which is the main portion of the light. In a top view, the fifth reflecting surface 245 is non-parallel to the first direction X and the second direction Y. That is, the fifth reflecting surface 245 is non-parallel to the third exit surface 223 of the third light-emitting element 220C in a top view. In a top view, the fifth reflecting surface 245 is inclined at, for example, 45 degrees with respect to the third emission surface 223 of the third light emitting element 220C.

[0086] In top view, the second reflecting surface 242 is disposed between the first reflecting surface 241 and the third reflecting surface 243 in the second direction Y. That is, as shown in FIG. 5 , the second reflecting surface 242 is not disposed at a position where the first line S1 and the second line S2 pass in top view. By disposing the second reflecting surface 242 in this manner, it is possible to prevent the second reflecting surface 242 from overlapping with the first light L1 emitted from the first light-emitting element 220A and incident on the first reflecting surface 241, and the second light L2 emitted from the second light-emitting element 220B and incident on the third reflecting surface 243. Furthermore, the second reflecting surface 242 is disposed between the first line S1 and the second line S2 in top view. This allows the first light L1 reflected upward by the second reflecting surface 242 to be brought closer to the second light L2 reflected upward by the fourth reflecting surface 244 on the upper surface of the cover member 213.

[0087] In top view, the fourth reflecting surface 244 is disposed between the third reflecting surface 243 and the fifth reflecting surface 245 in the second direction Y. That is, as shown in FIG. 5 , the fourth reflecting surface 244 is not disposed at a position where the second line S2 and the third line S3 pass in top view. This prevents the fourth reflecting surface 244 from overlapping with the second light L2 emitted from the second light-emitting element 220B and incident on the third reflecting surface 243, and the third light L3 emitted from the third light-emitting element 220C and incident on the fifth reflecting surface 245. The fourth reflecting surface 244 is disposed between the second line S2 and the third line S3 in top view. This prevents the second light L2 reflected by the third reflecting surface 243 and incident on the fourth reflecting surface 244 from overlapping with the third light L3 emitted from the third light-emitting element 220C and incident on the fifth reflecting surface 245.

[0088] In top view, the sixth reflecting surface 246 is disposed on the opposite side of the fourth reflecting surface 244 across the fifth reflecting surface 245 in the second direction Y. That is, as shown in FIG. 5 , the sixth reflecting surface 246 is not disposed in a position where the third line S3 passes in top view. This prevents the sixth reflecting surface 246 from overlapping with the third light L3 emitted from the third light-emitting element 220C and incident on the fifth reflecting surface 245. In top view, the sixth reflecting surface 246 is disposed on the opposite side of the fourth reflecting surface 244 across the third line S3. This prevents the third light L3 reflected upward by the sixth reflecting surface 246 from overlapping with the second light L2 reflected upward by the fourth reflecting surface 244.

[0089] The first reflecting surface 241, the third reflecting surface 243, and the fifth reflecting surface 245 may or may not be parallel to each other. The second reflecting surface 242, the fourth reflecting surface 244, and the sixth reflecting surface 246 may or may not be parallel to each other. A reflecting surface arbitrarily selected from the first reflecting surface 241, the third reflecting surface 243, and the fifth reflecting surface 245 is neither parallel nor perpendicular to a reflecting surface arbitrarily selected from the second reflecting surface 242, the fourth reflecting surface 244, and the sixth reflecting surface 246. Here, "parallel" and "perpendicular" include a difference of ±5 degrees.

[0090] Lid member 213 is disposed on upper surface 212a of frame portion 212. Specifically, lid member 213 is supported by upper surface 212a of frame portion 212, and is disposed above first light-emitting element 220A, second light-emitting element 220B, and third light-emitting element 220C, as well as first reflecting member 240A, second reflecting member 240B, third reflecting member 240C, and fourth reflecting member 240D, which are surrounded by frame portion 212. For example, a metal film provided on the outer periphery of the lower surface of lid member 213 and a metal film provided on upper surface 212a of frame portion 212 are bonded and fixed via Au—Sn or the like.

[0091] By joining the lid member 213 to the upper surface 212a of the frame portion 212, a closed space is formed in which the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C are arranged. This closed space is also formed in an airtight sealed state. By being airtight sealed, it is possible to prevent organic matter and the like from collecting on the emission surfaces of the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C.

[0092] 6 and 7, in first light-emitting element 220A, first light L1 emitted from first emission surface 221 travels toward first reflection surface 241. The optical axis of first light L1 emitted from first emission surface 221 is, for example, parallel to upper surface 211a of base 211. The optical axis of first light L1 emitted from first emission surface 221 coincides with first line S1 shown in FIG. 5 in top view, for example. First direction X is perpendicular to first emission surface 221. First light L1 emitted from first emission surface 221 and traveling toward first reflection surface 241 includes light traveling in first direction X.

[0093] The first light L1 irradiated onto the first reflecting surface 241 is reflected by the first reflecting surface 241. The first light L1 reflected by the first reflecting surface 241 travels toward the second reflecting surface 242. The first light L1 reflected by the first reflecting surface 241 and traveling toward the second reflecting surface 242 includes light traveling in the second direction Y. The first light L1 irradiated onto the second reflecting surface 242 is reflected upward from the top surface 211a of the base 211 and travels toward the lid member 213. The first light L1 reflected by the second reflecting surface 242 and traveling toward the lid member 213 includes light traveling in the third direction Z. The optical axis of the first light L1 reflected by the second reflecting surface 242 and traveling toward the lid member 213 can be, for example, perpendicular to the top surface 211a of the base 211. The inclination of the second reflecting surface 242 with respect to the upper surface 211a of the base 211 may be adjusted so that the angle of the optical axis of the first light L1 is inclined with respect to the upper surface 211a of the base 211.

[0094] Furthermore, in second light-emitting element 220B, second light L2 emitted from second emission surface 222 travels toward third reflecting surface 243. The optical axis of second light L2 emitted from second emission surface 222 is, for example, parallel to upper surface 211a of base 211. The optical axis of second light L2 emitted from second emission surface 222 coincides with second straight line S2 shown in FIG. 5, for example, in top view. Second emission surface 222 is, for example, perpendicular to first direction X. Second light L2 emitted from second emission surface 222 and traveling toward third reflecting surface 243 includes light traveling in first direction X.

[0095] The second light L2 irradiated onto the third reflecting surface 243 is reflected by the third reflecting surface 243. The second light L2 reflected by the third reflecting surface 243 travels toward the fourth reflecting surface 244. The second light L2 reflected by the third reflecting surface 243 and traveling toward the fourth reflecting surface 244 includes light traveling in the second direction Y. The second light L2 irradiated onto the fourth reflecting surface 244 is reflected upward from the top surface 211a of the base 211 and travels toward the lid member 213. The second light L2 reflected by the fourth reflecting surface 244 and traveling toward the lid member 213 includes light traveling in the third direction Z. The optical axis of the second light L2 reflected by the fourth reflecting surface 244 and traveling toward the lid member 213 can be, for example, perpendicular to the top surface 211a of the base 211. The inclination of the fourth reflecting surface 244 with respect to the upper surface 211a of the base 211 may be adjusted so that the optical axis of the second light L2 is inclined with respect to the upper surface 211a of the base 211.

[0096] Furthermore, in the third light emitting element 220C, the third light L3 emitted from the third emission surface 223 travels toward the fifth reflection surface 245. The optical axis of the third light L3 emitted from the third emission surface 223 is, for example, parallel to the upper surface 211a of the base 211. The optical axis of the third light L3 emitted from the third emission surface 223 coincides with the third straight line S3 shown in FIG. 5, for example, when viewed from above. The third emission surface 223 is, for example, perpendicular to the first direction X. The third light L3 emitted from the third emission surface 223 and traveling toward the fifth reflection surface 245 includes light traveling in the first direction X.

[0097] The third light L3 irradiated onto the fifth reflecting surface 245 is reflected by the fifth reflecting surface 245. The third light L3 reflected by the fifth reflecting surface 245 travels toward the sixth reflecting surface 246. The third light L3 reflected by the fifth reflecting surface 245 and traveling toward the sixth reflecting surface 246 includes light traveling in the second direction Y. The third light L3 irradiated onto the sixth reflecting surface 246 is reflected upward from the top surface 211a of the base 211 and travels toward the lid member 213. The third light L3 reflected by the sixth reflecting surface 246 and traveling toward the lid member 213 includes light traveling in the third direction Z. The optical axis of the third light L3 reflected by the sixth reflecting surface 246 and traveling toward the lid member 213 can be, for example, perpendicular to the top surface 211a of the base 211. The inclination of the sixth reflecting surface 246 with respect to the upper surface 211a of the base 211 may be adjusted so that the optical axis of the third light L3 is inclined with respect to the upper surface 211a of the base 211.

[0098] In a top view, for example, the light traveling along the optical axis of the first light L1 from the first exit surface 221 to the first reflecting surface 241, the light traveling along the optical axis of the second light L2 from the second exit surface 222 to the third reflecting surface 243, and the light traveling along the optical axis of the third light L3 from the third exit surface 223 to the fifth reflecting surface 245 are parallel. In a top view, for example, the light traveling along the optical axis of the first light L1 from the first reflecting surface 241 to the second reflecting surface 242, the light traveling along the optical axis of the second light L2 from the third reflecting surface 243 to the fourth reflecting surface 244, and the light traveling along the optical axis of the third light L3 from the fifth reflecting surface 245 to the sixth reflecting surface 246 are parallel. In addition, in the illustrated example, light traveling along the optical axis of the first light L1 after being reflected by the first reflecting surface 241 and entering the second reflecting surface 242, light traveling along the optical axis of the second light L2 after being reflected by the third reflecting surface 243 and entering the fourth reflecting surface 244, and light traveling along the optical axis of the third light L3 after being reflected by the fifth reflecting surface 245 and entering the sixth reflecting surface 246 travel along a single straight line parallel to the second direction Y when viewed from above.

[0099] The optical path length of the light traveling along the optical axis of the first light L1 emitted from the first exit surface 221 to the second reflecting surface 242, the optical path length of the light traveling along the optical axis of the second light L2 emitted from the second exit surface 222 to the fourth reflecting surface 244, and the optical path length of the light traveling along the optical axis of the third light L3 emitted from the third exit surface 223 to the sixth reflecting surface 246 are, for example, equal.

[0100] Figure 8 is a diagram schematically showing light emitted to the outside from top surface 213a of cover member 213. Figure 8 shows the shape of the passage area on top surface 213a of cover member 213 through which first light L1, second light L2, and third light L3 pass. In this specification, top surface 213a of cover member 213 is defined as a light-transmitting surface through which first light L1, second light L2, and third light L3 reflected upward by second reflecting member 240B, third reflecting member 240C, and fourth reflecting member 240D pass.

[0101] 8, the length of the first light L1 on the upper surface 213a of the cover member 213 in the first direction X is shorter than the length in the second direction Y. An example of such a case is when the first light L1 has an elliptical shape.

[0102] The first light L1 emitted from the first emission surface 221 of the first light emitting element 220A and traveling toward the first reflecting surface 241 has a direction passing through the major axis of the ellipse (fast axis direction) facing the third direction Z, and a direction passing through the minor axis (slow axis direction) facing the second direction Y. That is, the first light L1 emitted from the first emission surface 221 of the first light emitting element 220A and traveling toward the first reflecting surface 241 has a length in the second direction Y that is shorter than the length in the third direction Z. On the other hand, when the first light L1 is reflected by the first reflecting surface 241 by approximately 90 degrees, the elliptical shape of the first light L1 rotates by approximately 90 degrees around the axis of the third direction Z. Therefore, the first light L1 reflected by the first reflecting surface 241 and traveling toward the second reflecting surface 242 has a direction passing through the minor axis (slow axis direction) facing the first direction X, and the length in the first direction X is shorter than the length in the third direction Z. Furthermore, when the first light L1 is reflected by the second reflecting surface 242 by approximately 90 degrees, the elliptical shape of the first light L1 rotates by approximately 90 degrees around the first direction X. At this time, the direction passing through the major axis of the elliptical shape of the first light L1 on the upper surface 213a of the cover member 213 (fast axis direction) faces the second direction Y, and the length in the first direction X becomes shorter than the length in the second direction Y.

[0103] 8, the length of the second light L2 on the upper surface 213a of the cover member 213 in the first direction X is shorter than the length in the second direction Y. An example of such a case is when the second light L2 has an elliptical shape.

[0104] The second light L2 emitted from the second emission surface 222 of the second light emitting element 220B and traveling toward the third reflection surface 243 has a direction passing through the major axis of the ellipse (fast axis direction) facing the third direction Z, and a direction passing through the minor axis (slow axis direction) facing the second direction Y. That is, the second light L2 emitted from the second emission surface 222 of the second light emitting element 220B and traveling toward the third reflection surface 243 has a length in the second direction Y that is shorter than the length in the third direction Z. On the other hand, when the second light L2 is reflected by the third reflection surface 243 by approximately 90 degrees, the elliptical shape of the second light L2 rotates by approximately 90 degrees around the third direction Z as an axis. Therefore, the second light L2 reflected by the third reflection surface 243 and traveling toward the fourth reflection surface 244 has a direction passing through the minor axis (slow axis direction) facing the first direction X, and the length in the first direction X is shorter than the length in the third direction Z. Furthermore, when the second light L2 is reflected by the fourth reflecting surface 244 by approximately 90 degrees, the elliptical shape of the second light L2 rotates by approximately 90 degrees around the axis of the first direction X. At this time, the direction passing through the major axis of the elliptical shape of the second light L2 on the upper surface 213a of the cover member 213 (fast axis direction) faces the second direction Y, and the length in the first direction X becomes shorter than the length in the second direction Y.

[0105] 8, the length of the third light L3 on the upper surface 213a of the cover member 213 in the first direction X is shorter than the length in the second direction Y. An example of such a case is when the third light L3 has an elliptical shape.

[0106] The third light L3 emitted from the third exit surface 223 of the third light-emitting element 220C and traveling toward the fifth reflecting surface 245 has a direction passing through the major axis of the ellipse (fast axis direction) facing the third direction Z, and a direction passing through the minor axis (slow axis direction) facing the second direction Y. That is, the third light L3 emitted from the third exit surface 223 of the third light-emitting element 220C and traveling toward the fifth reflecting surface 245 has a length in the second direction Y that is shorter than the length in the third direction Z. On the other hand, when the third light L3 is reflected by the fifth reflecting surface 245 by approximately 90 degrees, the elliptical shape of the third light L3 rotates by approximately 90 degrees around the third direction Z as an axis. Therefore, the third light L3 reflected by the fifth reflecting surface 245 and traveling toward the sixth reflecting surface 246 has a direction passing through the minor axis (slow axis direction) facing the first direction X, and the length in the first direction X is shorter than the length in the third direction Z. Furthermore, when the third light L3 is reflected by the sixth reflecting surface 246 by approximately 90 degrees, the elliptical shape of the third light L3 rotates by approximately 90 degrees around the axis of the first direction X. At this time, the direction passing through the major axis of the elliptical shape of the third light L3 on the upper surface 213a of the cover member 213 (fast axis direction) faces the second direction Y, and the length in the first direction X becomes shorter than the length in the second direction Y.

[0107] On the upper surface 213a of the cover member 213, the light emitted from the multiple light emitting elements 220 is aligned in series in the second direction Y, for example. In other words, the first light L1, the second light L2, and the third light L3 are aligned on a straight line in the second direction Y, with the direction passing through the major axis of each ellipse (fast axis direction) facing the second direction Y. This allows, for example, when the light emitted from the light emitting device 200 is made incident on another member, the length of the incident region of that member in the first direction X can be shortened. An example of the other member is a light guide plate.

[0108] In this case, "arranged in a straight line" means that, in a side view seen from the second direction Y, the distance from one end to the other end of the light of the multiple light emitting elements 220 in the first direction X does not exceed the sum of the lengths of the minor axes (slow axes) of the elliptical shapes of the light of each light emitting element 220. In the example shown in Fig. 8, the first light L1, the second light L2, and the third light L3 are arranged in series in the second direction Y, for example. In other words, the first light L1, the second light L2, and the third light L3 are arranged in a straight line, for example, with the direction passing through the major axes of the respective elliptical shapes (fast axis direction) facing the second direction Y.

[0109] The first light L1, the second light L2, and the third light L3 do not overlap with each other on the upper surface 213a of the lid member 213. On the upper surface 213a of the lid member 213, the length of each light in the first direction X (slow axis direction) can be, for example, 0.4 mm or more and 1 mm or less. Furthermore, the length of each light in the second direction Y (fast axis direction) can be, for example, about 2 to 3 times the length of the first direction X (slow axis direction).

[0110] In this way, in the light emitting device 200, the light emitted from each of the light emitting surfaces of the plurality of light emitting elements is reflected upward by one or more reflecting members, thereby enabling the light emitting device 200 to be made smaller.

[0111] [Light-emitting module] FIG. 9 is a perspective view (part 1) illustrating a light-emitting module including the light-emitting device 200. FIG. 10 is a side view (part 1) illustrating a light-emitting module including the light-emitting device 200. As shown in FIGS. 9 and 10 , the light-emitting module 500 includes the light-emitting device 200 and a light guide plate 520 disposed above the light-emitting device 200. The light-emitting module 500 may further include one or more of a reflector 510, a diffusion sheet 530, a prism sheet 540, and a polarizer 550, as necessary. Below, a case will be described in which the light-emitting module 500 includes all of the reflector 510, the diffusion sheet 530, the prism sheet 540, and the polarizer 550 in addition to the light-emitting device 200 and the light guide plate 520.

[0112] The polarizing plate 550, the prism sheet 540, the diffusion sheet 530, the light guide plate 520, and the reflector 510 are layered in this order in the first direction X. Light emitted from the light emitting device 200 is emitted to the light guide plate 520. In other words, the light guide plate 520 is disposed at a position where the first light L1, the second light L2, and the third light L3 emitted from the cover member 213 of the light emitting device 200 are incident. The light guide plate 520 is a member for surface-emitting the first light L1, the second light L2, and the third light L3 emitted from the light emitting device 200.

[0113] The light guide plate 520 has at least a light extraction surface 521, a light reflection surface 522, and a plurality of side surfaces 523 connecting them. Among the plurality of side surfaces 523, a side surface facing the light emitting device 200 serves as a light incident surface 523a. That is, the first light L1, the second light L2, and the third light L3 emitted from the light emitting device 200 enter the light guide plate 520 from the light incident surface 523a.

[0114] At least a portion of the light emitted from the light emitting device 200 and incident on the light guide plate 520 is directed toward the light reflecting surface 522 of the light guide plate 520. The light reflecting surface 522 of the light guide plate 520 may have irregularities. This allows the light directed toward the light reflecting surface 522 of the light guide plate 520 to be reflected toward the light extraction surface 521 and extracted. Note that in FIG. 10 , the arrow indicated by a solid line indicates the direction of light emitted from the light emitting module 500.

[0115] It is preferable that the optical axes of the first light L1, second light L2, and third light L3 emitted from the light emitting device 200 are not parallel to the light reflecting surface 522 of the light guide plate 520. As in the example shown in Figures 9 and 10, it is preferable that the light guide plate 520 is mounted at an incline so that the upper surface 213a of the cover member 213 of the light emitting device 200 and the light reflecting surface 522 of the light guide plate 520 are inclined.

[0116] Fig. 11 is a perspective view (part 2) illustrating a light-emitting module including the light-emitting device 200. Fig. 12 is a side view (part 2) illustrating a light-emitting module including the light-emitting device 200. As in the example shown in Figs. 11 and 12, the upper surface 213a of the cover member 213 of the light-emitting device 200 and the light incident surface 523a of the light guide plate 520 may be perpendicular to each other, and the light reflecting surface 522 may be inclined so that the angle between the light reflecting surface 522 and the light incident surface 523a is an acute angle.

[0117] The angle formed between the optical axis of each light emitted from the light emitting device 200 and the light reflecting surface 522 of the light guide plate 520 is preferably in the range of 5 degrees to 30 degrees, and more preferably in the range of 10 degrees to 15 degrees. This makes it easier for each light emitted from the light emitting device 200 to irradiate the entire light reflecting surface 522 of the light guide plate 520.

[0118] The reflecting plate 510 is disposed on the light reflecting surface 522 side of the light guide plate 520, and is a member that reflects light (leaked light) emitted laterally from the light reflecting surface 522 of the light guide plate 520 back to the light guide plate 520. In this manner, light can be efficiently extracted from the light extraction surface 521.

[0119] The diffusion sheet 530 is disposed on the light extraction surface 521 side of the light guide plate 520, and is a member that diffuses the light emitted from the light guide plate 520. Even when the light from the light emitting device 200 has a strong directivity, the provision of the diffusion sheet 530 makes it possible to more uniformly emit the light guided by the light guide plate 520 from the light extraction surface 521.

[0120] Furthermore, a prism sheet 540 that focuses light from the diffusion sheet 530 toward the side, or a polarizing plate 550 that selectively transmits only the desired polarized light component, can be provided on the side of the diffusion sheet 530 opposite the light guide plate 520.

[0121] As shown in FIG. 8 , on the upper surface 213a of the cover member 213 of the light-emitting device 200, the first light L1, the second light L2, and the third light L3 are aligned on a straight line in the second direction Y, with the direction (fast axis direction) passing through the major axis of each ellipse. This shortens the lengths of the first light L1, the second light L2, and the third light L3 in the first direction X, allowing the thickness of the light guide plate 520 to be thin. In other words, the thickness of the light guide plate 520 only needs to be slightly thicker than the length of each light in the slow axis direction, allowing the thickness of the light guide plate 520 to be thin. As a result, the light-emitting module 500 can be made thinner and more compact.

[0122] The light emitting module 500 can be used, for example, as a backlight source. In addition to being used as a backlight source, the light emitting module 500 can also be used in all kinds of devices, such as optical discs, optical communication systems, projectors, displays, printers, and measuring instruments.

[0123] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims. [Explanation of symbols]

[0124] 200 Light-emitting device 210 packages 211 Base 211a, 212a, 213a, 214a, 247, 248, 249 Top 211b, 212b bottom surface 212 Frame 212c inner surface 212d External surface 213 Cover member 214 Step 216 Wiring area 216A 1st wiring area 216B 2nd wiring area 216C 3rd wiring area 220 Light-emitting element 220A First light-emitting element 220B second light-emitting element 220C Third light-emitting element 221 First exit surface 222 second exit surface 223 Third exit surface 230 Submount 240 Reflective material 240A First reflecting member 240B Second reflecting member 240C Third reflecting member 240D Fourth reflecting member 241 1st reflective surface 242 Second reflective surface 243 Third reflective surface 244 4th reflective surface 245 5th reflective surface 246 6th reflective surface 250 Protection element 250A First Protection Element 250B Second protection element 250C Third protection element 270 Wiring 500 Light Emitting Module 510 Reflector 520 Light guide plate 521 Light extraction surface 522 Light reflective surface 523 Side 523a Light entrance surface 530 Diffusion Sheet 540 Prism Sheet 550 Polarizing Plate

Claims

1. A base and a first light-emitting element disposed on an upper surface of the base; a frame portion that surrounds at least a portion of an upper surface of the base portion and has an inner surface that extends above the upper surface, the frame portion has one or more step portions that are connected along the inner side surface extending in a first direction and have a predetermined width in a second direction perpendicular to the first direction in a top view, a first wiring region to which wiring connected to the first light-emitting element is bonded is provided on an upper surface of the one or more step portions, and a first metal film and a second metal film are provided in the first wiring region; a first boundary between the first metal film and the second metal film has a portion extending in a direction parallel to the first direction of the step portion; a first protection element disposed across a portion of the first boundary extending in a direction parallel to the first direction in the second direction;

2. The light emitting device according to claim 1 , wherein the first protection element has a width in the second direction greater than a width in the first direction in a top view.

3. The light emitting device according to claim 1 , wherein the width in the first direction of the step portion extending in the first direction is wider than the predetermined width.

4. Further, a second light emitting element is disposed on the upper surface of the base, the one or more step portions are connected along the inner side surface extending in a third direction and have a predetermined width in a fourth direction perpendicular to the third direction in a top view; 2. The light-emitting device of claim 1, wherein a second wiring region is provided on the upper surface of one or more of the step portions, to which wiring connected to the second light-emitting element is joined, and a third metal film and a fourth metal film are provided in the second wiring region.

5. a second boundary between the third metal film and the fourth metal film has a portion extending in a direction parallel to the fourth direction of the step portion; The light emitting device according to claim 4 , further comprising a second protective element disposed across a portion of the second boundary extending in a direction parallel to the fourth direction in the third direction.

6. The light emitting device of claim 5 , wherein the first direction is not parallel to the third direction.

7. Further, a third light-emitting element is provided and is disposed on an upper surface of the base, The light-emitting device of claim 5, wherein a third wiring region is provided on the upper surface of the one or more step portions, to which wiring connected to the third light-emitting element is joined, and a fifth metal film and a sixth metal film are provided in the third wiring region.

8. Among the first light-emitting element, the second light-emitting element, and the third light-emitting element, at least one of which emits blue light; at least one emits green light; 8. The light emitting device of claim 7, wherein at least one emits red light.

9. A base and a frame portion that surrounds at least a portion of an upper surface of the base portion and has an inner surface that extends above the upper surface, the frame portion has one or more step portions connected along the inner side surface extending in a first direction and having a predetermined width in a second direction perpendicular to the first direction in a top view, a first wiring region is provided on an upper surface of the one or more step portions, and a first metal film and a second metal film are provided in the first wiring region; the first metal film and the second metal film are separated by a first boundary; a first boundary between the first metal film and the second metal film has a first portion extending in a direction parallel to the first direction of the step portion and a second portion extending in a direction perpendicular to the first direction of the step portion; The first portion and the second portion of the package are in contact.

10. The package according to claim 9 , wherein the width of the step portion extending in the first direction is greater than the predetermined width.

11. a second wiring region is provided on an upper surface of the one or more step portions, and a third metal film and a fourth metal film are provided in the second wiring region; The package of claim 9, wherein the one or more step portions are connected along the inner surface extending in a third direction, have a predetermined width in a fourth direction perpendicular to the third direction in a top view, and the third metal film and the fourth metal film are separated by a second boundary.

12. The package according to claim 11 , wherein a second boundary between the third metal film and the fourth metal film has a portion extending in a direction parallel to the fourth direction of the step portion.

13. The package of claim 12 , wherein the first direction is not parallel to the third direction.

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