Light-emitting device, 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 Art

[0002] Patent Document 1 discloses an LD module having a plurality of laser diodes and a plurality of mirrors arranged on the upper surface of a substrate. In this LD module, after the light emitted from each laser diode is collimated by a collimating lens into parallel light, it is reflected twice by a mirror and advanced in a direction parallel to the upper surface of the substrate and incident on an optical fiber.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the LD module of Patent Document 1, the mirrors are arranged with a shift 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 enables miniaturization. Another object is to provide a light-emitting module including this light-emitting device.

Means for Solving the Problems

[0006] A light-emitting device according to an embodiment of the present disclosure includes a base portion, 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, a plurality of light-emitting elements each disposed on the upper surface of the base portion, and one or more reflecting members disposed on the upper surface of the base portion and reflecting the first light and the second light upward. The one or more reflecting members have 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. The first light emitted from the first emission surface and traveling to the first reflecting surface includes light traveling in a first direction parallel to the upper surface of the base portion. The first light reflected by the first reflecting surface and traveling to the second reflecting surface includes the above-mentioned light traveling in a second direction parallel to the upper surface of the base portion and perpendicular to the first direction , in a top view, the first reflecting surface is arranged at a position through which a first straight line, which is a virtual line passing through the first emission surface and perpendicular to the first emission surface, passes; the second reflecting surface is not arranged at the position through which the first straight line passes in the top view; and the second reflecting surface is arranged between the first straight line and a second straight line, which is a virtual line passing through the second emission surface and perpendicular to the second emission surface, in the top view .

[0007] A light-emitting module according to an embodiment of the present disclosure includes the light-emitting device according to an embodiment of the present disclosure and a light guide plate disposed above the light-emitting device. The light emitted from the light-emitting device is emitted to the light guide plate.

Advantages of the Invention

[0008] According to an embodiment of the present disclosure, a light-emitting device capable of miniaturization can be provided. Further, a light-emitting module including this light-emitting device can be provided.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

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Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the following description, terms indicating a specific direction or position (for example, "up", "down", and other terms including those terms) are used as necessary. However, the use of those terms is for facilitating the understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meanings of those terms. Also, parts denoted by the same reference numerals appearing in a plurality of drawings indicate the same or equivalent parts or members.

[0011] In addition, in the present disclosure, with regard to polygons such as triangles and quadrilaterals, shapes obtained by performing processing such as rounding, chamfering, corner rounding, and filleting at the corners of the polygon are also included and are referred to as polygons. Also, not limited to the corners (ends of the sides), shapes obtained by performing processing on the middle part of the sides are similarly referred to as polygons. That is, shapes obtained by performing partial processing while leaving the polygon as a base are included in the interpretation of "polygon" described in the present disclosure.

[0012] Moreover, not only for polygons, but also for words representing specific shapes such as trapezoids, circles, concavities and convexities, etc., the same applies. The same also applies when dealing with each side forming the shape. That is, even if a side has been processed at a corner or an intermediate part, the processed part is also included in the interpretation of "side". When distinguishing a "polygon" or "side" without partial processing from the processed shape, "strict" shall be added, for example, described as "strict quadrilateral", etc.

[0013] Furthermore, the following embodiments exemplify a light-emitting device or the like for embodying the technical idea of the present invention, and do not limit the present invention as follows. Also, the dimensions, materials, shapes, relative arrangements, etc. of the constituent parts described below are not intended to limit the scope of the present invention only thereto, but are intended to be exemplified unless specifically described. Also, the content described in one embodiment is applicable to other embodiments and modifications. Also, the sizes and positional relationships of the members shown in the drawings may be exaggerated for clarity of explanation. Furthermore, in order to avoid excessive complexity of the drawings, a schematic diagram omitting the illustration of some elements or an end view showing only the cut surface as a cross-sectional view may be used.

[0014] [Light-emitting device] The light-emitting device according to the present embodiment includes at least a base, a plurality of light-emitting elements arranged on the upper surface of the base, and one or more reflecting members arranged on the upper surface of the base. The plurality of light-emitting elements includes at least a first light-emitting element and a second light-emitting element. Also, the one or more reflecting members have a first reflecting surface that reflects the 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 the second light emitted by the second light-emitting element.

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

[0016] The illustrated light-emitting device 200 is an example of the light-emitting device according to the present embodiment. The light-emitting device 200 includes a package 210 including a base 211, a frame portion 212, and a lid member 213, a plurality of light-emitting elements 220, one or more submounts 230 that support the plurality of light-emitting elements, one or more reflection members 240, a protection 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 in a top view.

[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 in a top view. One or more inner surfaces 212c of the frame portion 212 have inner surfaces 212c that intersect the upper surface 211a of the base 211. One or more inner surfaces 212c of the frame portion 212 surround at least a part of the upper surface 211a of the base 211 and reach above the upper surface 211a. The lower surface 212b of the frame portion 212 is located, for example, on the same plane as the lower surface 211b of the base 211.

[0020] In FIGS. 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 or perpendicular to any of the inner surfaces 212c of the frame portion 212 in a top view. The same applies to the subsequent figures.

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

[0022] The frame portion 212 may have one or more stepped portions 214 that connect along two opposite sides in a top view. In the illustrated example, in a top view, the stepped portion 214 is provided along one of the two opposite sides among the four sides where the upper surface 212a and the inner surface 212c of the frame portion 212 are connected, and along one side connecting these two sides. The stepped portion 214 is not provided along the other side connecting the two sides. However, the stepped portion 214 may be provided along all four sides where the upper surface 212a and the inner surface 212c of the frame portion 212 are connected in a top view, or may be provided only along a set of two opposite sides. The stepped portion 214 is composed of, for example, only the upper surface 214a and the side surface that intersects the upper surface 214a and extends downward.

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

[0024] In a top view, the stepped portion 214 may extend in the first direction X and have a wiring region 216 on the upper surface 214a along each of two opposite sides sandwiching a plurality of light-emitting elements. In the illustrated example, further, the stepped portion 214 has a wiring region 216 on the upper surface 214a along one side extending in the second direction Y. For example, one or more metal films are provided in each wiring region 216. Also, one or more metal films may be provided on the upper surface 212a and the lower surface 212b of the frame portion 212. Also, the one or more metal films provided on the upper surface 214a of the stepped portion 214 may include a metal film that is electrically connected to the 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 include a metal film that is electrically connected to the metal film provided on the upper surface 212a. As the metal film, for example, Ni / Au (a metal film laminated in the order of Ni and Au) or Ti / Pt / Au (a metal film laminated in the order of Ti, Pt, and Au) can be used.

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

[0026] Note that the lid member 213 is not limited to a rectangular parallelepiped or a cube. That is, the lid member 213 is not limited to a rectangle in a top view and can have any shape such as a circle, an ellipse, or a polygon.

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

[0028] The base portion 211 can be formed, for example, using metal, and the frame portion 212 can be formed, for example, using ceramics as the main material. Examples of the metal for forming the base portion 211 include copper. Further, as the ceramics for forming the frame portion 212, aluminum nitride, silicon nitride, aluminum oxide, or silicon carbide can be used. Note that the main materials for forming the base portion 211 and the frame portion 212 are not limited to these, and the base portion 211 may be formed of ceramics and the frame portion 212 may be formed of metal. Both the base portion 211 and the frame portion 212 may be formed from ceramics, or both may be formed from metal. The base portion 211 and the frame portion 212 are not limited to metal and ceramics, and may be formed using other insulating materials as the main material.

[0029] The lid member 213 has a light transmission portion through which light of a predetermined wavelength passes at least in part. The lid member 213 can be formed, for example, using a light-transmissive material such as sapphire, quartz, silicon carbide, or glass as the main material. Also, in the illustrated example, the lid member 213 is provided with a metal film on the joint surface with the upper surface 212a of the frame portion 212. Further, the lid member 213 may be provided with a metal film so as to have a light transmission portion only in part.

[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 in plan view. Also, one of the two short sides of the rectangle, the side surface that intersects it, serves as the light-emitting surface of the light emitted from the light-emitting element 220. Also, the upper and lower surfaces of the light-emitting element 220 have a larger area than the light-emitting surface.

[0032] Here, the case where the light-emitting element 220 is a semiconductor laser element will be described. 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, the FFP indicates the shape and light intensity distribution of the emitted light at a position away from the emission surface.

[0033] 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 a plurality of semiconductor layers including the active layer of the light-emitting element 220 are stacked.

[0034] Also, based on the light intensity distribution of the FFP of the light-emitting element 220, the light having an intensity of 1 / e 2 or more with respect to the peak intensity value is defined as the light of the main part. Also, in this light intensity distribution, the angle corresponding to the intensity of 1 / e 2 is defined as 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] Also, the light passing through the center of the ellipse of the FFP, in other words, the light having the peak intensity in the light intensity distribution of the FFP, is defined 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 defined as the optical axis of that light.

[0036] As the light-emitting element 220, 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 adopted. Also, a semiconductor laser element that emits light other than these may be adopted.

[0037] Here, blue light refers to light whose emission peak wavelength is within the range of 420 nm to 494 nm. Green light refers to light whose emission peak wavelength is within the range of 495 nm to 570 nm. Red light refers to light whose emission peak wavelength is within the range of 605 nm to 750 nm.

[0038] Examples of the semiconductor laser element that emits blue light or the semiconductor laser element that emits green light include a semiconductor laser element containing a nitride semiconductor. As the nitride semiconductor, for example, GaN, InGaN, and AlGaN can be used. Examples of the semiconductor laser element that emits red light include those containing a semiconductor of InAlGaP system, GaInP system, GaAs system, or AlGaAs system.

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

[0040] (Reflection member 240) The reflection member 240 has one or more reflection surfaces. A plurality of reflection surfaces are provided by one or more reflection members 240. In the example shown in FIGS. 1 to 4, the light emitting device 200 has a plurality of reflection members 240. The plurality of reflection members 240 include a first reflection member 240A, a second reflection member 240B, a third reflection member 240C, and a fourth reflection member 240D.

[0041] The following describes the first to fourth reflecting members 240A to 240D. Note that a single reflecting member 240 formed integrally with a plurality or all of the first to fourth reflecting members 240A to 240D can also be used. Therefore, the description of each of the reflecting members 240 from the first reflecting member 240A to the fourth reflecting member 240D given below is also a description of one or more reflecting members 240. That is, for example, the features of the first reflecting member 240A can also be said to be the features of one or more reflecting members 240.

[0042] In the following description of the first reflecting member 240A, the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D, parallel and perpendicular shall include a difference of ±5 degrees. Also, when describing specific angles such as the tilt angle, a difference of ±5 degrees from the specific angle shall be included in consideration of the manufacturing accuracy.

[0043] The first reflecting member 240A includes an upper surface 247, a lower surface, and a plurality of side surfaces that intersect the upper surface 247 and the lower surface. In the illustrated light-emitting device 200, the upper surface 247, the lower surface, and the plurality of side surfaces are each planar. The upper surface 247 and the lower surface are parallel to each other. Also, the lower surface has the same area as the upper surface 247. However, the positional relationship and the size of the areas of the upper surface 247 and the lower surface are not limited to this.

[0044] The plurality of side surfaces include a first reflecting surface 241 that reflects incident light. The plurality of side surfaces may include non-parallel side surfaces. In the illustrated light-emitting device 200, the upper surface 247 is a substantially right-angled triangle, and the first reflecting surface 241 is a rectangle. The upper surface 247 may be an isosceles right-angled triangle. The first reflecting surface 241 is perpendicular to the lower surface and intersects the long side of the upper surface 247.

[0045] Note that the upper surface 247, the lower surface, and the plurality of side surfaces may each be a curved surface, or a combination of a flat surface and a curved surface may be used. Also, the upper surface 247 does not have to be a triangle, and may be, for example, a polygon with four or more sides, a semi-circular shape, or the like. Further, the first reflecting surface 241 does not have to be a rectangle as long as it can reflect incident light in a desired direction.

[0046] The second reflecting member 240B includes an upper surface 248, a lower surface, and a plurality of side surfaces that intersect 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 each planar. The upper surface 248 and the lower surface are parallel to each other. Also, 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 plurality of side surfaces include a second reflecting surface 242 that reflects incident light and a third reflecting surface 243 that reflects incident light. Also, the plurality of side surfaces include two side surfaces that face each other with the second reflecting surface 242 therebetween in a top view. The two side surfaces that face each other with the second reflecting surface 242 therebetween have different areas from each other.

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

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

[0050] Note that the upper surface 248, the lower surface, and the plurality of side surfaces may each be a curved surface, or a combination of a flat surface and a curved surface. Also, the second reflecting surface 242 and the third reflecting surface 243 do not have to be rectangular as long as they can reflect the incident light in a desired direction. Further, in the second reflecting member 240B, the portion including the second reflecting surface 242 and the portion including the third reflecting surface 243 may be integral or separate.

[0051] The third reflecting member 240C includes an upper surface 249, a lower surface, and a plurality of side surfaces that intersect 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 each flat. 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 248 and the lower surface and the size of the areas are not limited to this.

[0052] The plurality of side surfaces include a fourth reflecting surface 244 that reflects the incident light and a fifth reflecting surface 245 that reflects the incident light. Also, the plurality of side surfaces include two side surfaces that face each other with the fourth reflecting surface 244 interposed therebetween in a top view. The two side surfaces that face each other with the fourth reflecting surface 244 interposed therebetween have different areas from each other.

[0053] In the illustrated light-emitting device 200, the upper surface 249 is a right triangle, and the fourth reflecting surface 244 and the fifth reflecting surface 245 are rectangles. The upper surface 249 may be a right isosceles triangle. In a top view, one of the two sides of the upper surface 249 other than the long side intersects one side of the fourth reflecting surface 244 and has the same length. The side where the upper surface 249 and the fourth reflecting surface 244 intersect serves as the boundary between the upper surface 249 and the fourth reflecting surface 244. In a top view, the boundary between the upper surface 249 and the fourth reflecting surface 244 is within the region surrounded by the outer periphery of the lower surface and is between one side of the lower surface that intersects the fourth reflecting surface 244 and the fifth reflecting surface 245.

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

[0055] Note that the upper surface 249, the lower surface, and the plurality of side surfaces may each be a curved surface, or a plane and a curved surface may be mixed. Also, the fourth reflecting surface 244 and the fifth reflecting surface 245 do not have to be rectangular as long as they can reflect the incident light in a desired direction. The third reflecting member 240C may have exactly the same shape as the second reflecting member 240B. Also, in the third reflecting member 240C, the portion including the fourth reflecting surface 244 and the portion including the fifth reflecting surface 245 may be integral or separate.

[0056] The fourth reflecting member 240D includes a lower surface, a sixth reflecting surface 246 that reflects incident light, and a plurality of side surfaces that intersect the sixth reflecting surface 246 and the lower surface. In the illustrated light-emitting device 200, the lower surface, the sixth reflecting surface 246, and the plurality of side surfaces are each a plane.

[0057] The plurality of side surfaces include, in a top view, two side surfaces that face each other with the sixth reflecting surface 246 therebetween. The plurality of side surfaces also include, in a top view, one side surface that intersects the two side surfaces that face each other with the sixth reflecting surface 246 therebetween. The two side surfaces that face each other with the sixth reflecting surface 246 therebetween 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] Note that the bottom surface and the sixth reflecting surface 246 may each be a curved surface, or a plane and a curved surface may coexist. Further, the sixth reflecting surface 246 does not have to be rectangular as long as it can reflect incident light in a desired direction.

[0060] For the first reflecting member 240A, the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D, glass, metal, or the like can be used as the main material forming their outer shapes. The main material is preferably a heat-resistant material. For example, glass such as quartz or BK7 (borosilicate glass), metal such as aluminum, or Si can be used. Further, 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 using, 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 for preventing a specific element such as a semiconductor laser element from being destroyed by an excessive current flowing therethrough. As the protective element 250, for example, a Zener diode formed of Si can be used. Further, for example, the protective element 250 may be a component for measuring the temperature so that a specific element does not malfunction due to the temperature environment. As such a temperature measuring element, a thermistor can be used. The temperature measuring element is preferably disposed near the emission surface of the light emitting element 220.

[0062] (Wiring 270) The wiring 270 is composed of a conductor having a linear shape with both ends being joining portions. In other words, the wiring 270 has joining portions for joining to other components at both ends of the linear portion. 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 the metal 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 illustrated example, 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, in the light-emitting device 200, two light-emitting elements 220 may be arranged, or four or more light-emitting elements 220 may be arranged.

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

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

[0067] At the base 211, a plurality of submounts 230 are arranged on the upper surface 211a. In the illustrated example, a plurality of light-emitting elements 220 are respectively arranged 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 arranged on the upper surface 211a. In the illustrated light-emitting device 200, three submounts 230 are arranged. However, a plurality of light-emitting elements 220 may be arranged on one submount 230. The lower surface of the submount 230 is joined, 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 the present embodiment does not necessarily have a form with a submount. For example, a plurality of light-emitting elements 220 may be directly arranged on the upper surface 211a of the base 211, or a convex portion may be provided at a position where the plurality of light-emitting elements 220 are arranged, and the plurality of light-emitting elements 220 may be provided on the upper surface of the convex portion.

[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 in the longitudinal direction along the first direction X and are 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.

[0069] The plurality of light-emitting elements 220 are respectively arranged on the upper surface 211a via the submounts 230. The plurality of light-emitting elements 220 are arranged such that their respective emission surfaces face one side surface of the submount 230 on which each is arranged. The plurality of light-emitting elements 220 are arranged with their respective emission surfaces facing the same side. In the illustrated example, the first emission surface 221, the second emission surface 222, and the third emission surface 223 respectively included in the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C are all arranged to face the first direction X side. The first emission surface 221, the second emission surface 222, and the third emission surface 223 may be on the same plane. Here, being on the same plane means allowing a deviation of ±50 μm in the first direction X.

[0070] Of the plurality of light-emitting elements 220, one of the side surfaces intersecting the emission surface of one light-emitting element faces one of the side surfaces intersecting the emission surface of the other light-emitting element. In the illustrated example, one of the side surfaces intersecting the first emission surface 221 of the first light-emitting element 220A faces one of the side surfaces intersecting the second emission surface 222 of the second light-emitting element 220B. Also, the other of the side surfaces intersecting the second emission surface 222 of the second light-emitting element 220B faces one of the side surfaces intersecting the third emission surface 223 of the third light-emitting element 220C. The two side surfaces intersecting the first emission surface 221 of the first light-emitting element 220A, the two side surfaces intersecting the second emission surface 222 of the second light-emitting element 220B, and the two side surfaces intersecting 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] Here, 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 upper surface 214a along one side extending in the second direction Y is called the third wiring region 216C.

[0072] A plurality of wirings 270 connected to the plurality of light-emitting elements 220 are joined to the plurality of metal films provided in the wiring region 216 of the frame portion 212.

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

[0074] Also, among the two sides extending in the second direction Y, a wiring region 216 is not provided on the side where the light emitted by 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 by the light-emitting element 220.

[0075] The illustrated wiring pattern is merely an example, and the wiring region 216 may be provided only along the two sides extending in the first direction X. In that case, the wiring 270 connected to one light-emitting element 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, regarding the plurality of metal films provided in the wiring region 216, they are the first metal film, the second metal film, the third metal film, the fourth metal film, the fifth metal film, and the sixth metal film in the order in which they are provided in the first wiring region 216A, the third wiring region 216C, and the second wiring region 216B.

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

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

[0079] In this way, by disposing the second protection element 250B so as to cross the boundary extending in the direction parallel to the extending direction of the step portion, the short side direction of the second protection element 250B can be aligned with the extending direction of the step portion, enabling more efficient wiring.

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

[0081] In the illustrated example of the light-emitting device 200, the first reflecting member 240A, the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D, which are independent of each other, are arranged on the upper surface 211a of the base 211. The first reflecting member 240A, the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D are arranged side by side in the second direction Y. 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 are arranged, for example, at positions through which a straight line S0, which is a virtual line parallel to the second direction Y in a top view as shown in FIG. 5, passes.

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

[0083] The first reflecting surface 241 faces the direction of the first emission surface 221 of the first light-emitting element 220A. That is, as shown in FIG. 5, the first reflecting surface 241 is arranged at a position through which a first straight line S1, which is a virtual line passing through the first emission surface 221 of the first light-emitting element 220A and perpendicular to the first emission surface 221, passes in a top view. When the light emitted from the first light-emitting element 220A is light having a spread like a semiconductor laser element, by arranging the first reflecting surface 241 as described above, even when the first reflecting surface 241 is sized to be able to reflect all of the first light L1, which is the main part of the light, an over-sizing of the first reflecting surface 241 beyond necessity can be suppressed. In a top view, the first reflecting surface 241 is non-parallel to the first direction X and the second direction Y. That is, in a top view, the first reflecting surface 241 is non-parallel to the first emission surface 221 of the first light-emitting element 220A. In a top view, the first reflecting surface 241 is inclined, 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 emission surface 222 of the second light-emitting element 220B. That is, as shown in FIG. 5, the third reflecting surface 243 is arranged at a position through which a second straight line S2, which is a virtual line passing through the second emission surface 222 of the second light-emitting element 220B and perpendicular to the second emission surface 222, passes in a top view. When the light emitted from the second light-emitting element 220B is light having a spread like a semiconductor laser element, by arranging the third reflecting surface 243 as described above, even when the third reflecting surface 243 is sized to be able to reflect all of the second light L2, which is the main part of the light, an over-sizing of the third reflecting surface 243 beyond necessity can be suppressed. In a top view, the third reflecting surface 243 is non-parallel to the first direction X and the second direction Y. That is, in a top view, the third reflecting surface 243 is non-parallel to the second emission surface 222 of the second light-emitting element 220B. In a top view, the third reflecting surface 243 is inclined, 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 emission surface 223 of the third light-emitting element 220C. That is, as shown in FIG. 5, the fifth reflecting surface 245 is arranged at a position through which a third straight line S3, which is a virtual line passing through the third emission surface 223 of the third light-emitting element 220C and perpendicular to the third emission surface 223, passes in a top view. When the light emitted from the third light-emitting element 220C is light having a spread such as that of a semiconductor laser element, by arranging the fifth reflecting surface 245 as described above, even when the fifth reflecting surface 245 is sized to be able to reflect all of the third light L3, which is the main part of the light, an excessive enlargement of the fifth reflecting surface 245 can be suppressed. In a top view, the fifth reflecting surface 245 is non-parallel to the first direction X and the second direction Y. That is, in a top view, the fifth reflecting surface 245 is non-parallel to the third emission surface 223 of the third light-emitting element 220C. In a top view, the fifth reflecting surface 245 is inclined, for example, 45 degrees with respect to the third emission surface 223 of the third light-emitting element 220C.

[0086] In a top view, the second reflecting surface 242 is arranged 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 arranged at a position through which the first straight line S1 and the second straight line S2 pass in a top view. By arranging the second reflecting surface 242 in such a manner, it is possible to suppress 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. Further, the second reflecting surface 242 is arranged between the first straight line S1 and the second straight line S2 in a top view. Thereby, the first light L1 reflected upward by the second reflecting surface 242 can be brought closer to the second light L2 reflected upward by the fourth reflecting surface 244 on the upper surface of the lid member 213.

[0087] In a 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 through which the second straight line S2 and the third straight line S3 pass in a top view. Thereby, it is possible to suppress 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 straight line S2 and the third straight line S3 in a top view. Thereby, it is possible to suppress 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 a 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 at a position through which the third straight line S3 passes in a top view. Thereby, it is possible to suppress 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. The sixth reflecting surface 246 is disposed on the opposite side of the fourth reflecting surface 244 across the third straight line S3 in a top view. Thereby, it is possible to suppress 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 be parallel to each other 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 be parallel to each other or may not be parallel to each other. The reflecting surface arbitrarily selected from the first reflecting surface 241, the third reflecting surface 243, and the fifth reflecting surface 245 and the reflecting surface arbitrarily selected from the second reflecting surface 242, the fourth reflecting surface 244, and the sixth reflecting surface 246 are neither parallel nor perpendicular to each other. Here, the parallel and perpendicular include a difference of ±5 degrees.

[0090] The lid member 213 is disposed on the upper surface 212a of the frame portion 212. Specifically, the lid member 213 is supported by the upper surface 212a of the frame portion 212 and is disposed above the first light-emitting element 220A, the second light-emitting element 220B, the third light-emitting element 220C, and the first reflecting member 240A, the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D surrounded by the frame portion 212. For example, a metal film provided on the outer peripheral portion of the lower surface of the lid member 213 and a metal film provided on the upper surface 212a of the frame portion 212 are joined 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 in which the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C are arranged is formed. Further, this closed space is formed in a hermetically sealed state. By being hermetically sealed, it is possible to suppress dust collection of organic substances or the like on the respective emission surfaces of the first light-emitting element 220A, the second light-emitting element 220B, and the third light-emitting element 220C.

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

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

[0095] The second light L2 irradiated on 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 on the fourth reflecting surface 244 is reflected above the upper 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 perpendicular to the upper surface 211a of the base 211, for example. Note that 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] Also, in the third light-emitting element 220C, the third light L3 emitted from the third emission surface 223 travels toward the fifth reflecting surface 245. The optical axis of the third light L3 emitted from the third emission surface 223 is parallel to the upper surface 211a of the base 211, for example. 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 in a top view, for example. The third emission surface 223 is perpendicular to the first direction X, for example. The third light L3 emitted from the third emission surface 223 and traveling toward the fifth reflecting 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 above the upper 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 perpendicular to the upper surface 211a of the base 211, for example. Note that 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, the light traveling along the optical axis of the first light L1 from the first emission surface 221 until it enters the first reflecting surface 241, the light traveling along the optical axis of the second light L2 from the second emission surface 222 until it enters the third reflecting surface 243, and the light traveling along the optical axis of the third light L3 from the third emission surface 223 until it enters the fifth reflecting surface 245 are, for example, parallel. In a top view, the light traveling along the optical axis of the first light L1 reflected by the first reflecting surface 241 until it enters the second reflecting surface 242, the light traveling along the optical axis of the second light L2 reflected by the third reflecting surface 243 until it enters the fourth reflecting surface 244, and the light traveling along the optical axis of the third light L3 reflected by the fifth reflecting surface 245 until it enters the sixth reflecting surface 246 are, for example, parallel. Also, in the illustrated example, the light traveling along the optical axis of the first light L1 reflected by the first reflecting surface 241 until it enters the second reflecting surface 242, the light traveling along the optical axis of the second light L2 reflected by the third reflecting surface 243 until it enters the fourth reflecting surface 244, and the light traveling along the optical axis of the third light L3 reflected by the fifth reflecting surface 245 until it enters the sixth reflecting surface 246 travel on one straight line parallel to the second direction Y in a top view.

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

[0100] FIG. 8 is a diagram schematically showing light emitted to the outside from the upper surface 213a of the lid member 213. FIG. 8 shows the shapes of the passing regions of the first light L1, the second light L2, and the third light L3 passing through the upper surface 213a of the lid member 213 on the upper surface 213a of the lid member 213. In this specification, the upper surface 213a of the lid member 213 is defined as a light transmission surface through which the first light L1, the second light L2, and the third light L3 reflected upward by the second reflecting member 240B, the third reflecting member 240C, and the fourth reflecting member 240D pass.

[0101] As shown in FIG. 8, for the first light L1 on the upper surface 213a of the lid member 213, the length in the first direction X is shorter than the length in the second direction Y. As such an example, the case where the first light L1 has an elliptical shape can be cited.

[0102] The first light L1 emitted from the first emission surface 221 of the first light-emitting element 220A and traveling toward the first reflection surface 241 has the major axis direction (fast axis direction) of the elliptical shape facing the third direction Z and the minor 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 reflection surface 241 has a shorter length in the second direction Y than in the third direction Z. On the other hand, when the first light L1 is reflected by approximately 90 degrees at the first reflection surface 241, the elliptical shape of the first light L1 rotates by approximately 90 degrees about the third direction Z. Therefore, the first light L1 reflected by the first reflection surface 241 and traveling toward the second reflection surface 242 has the minor axis direction (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. Further, when the first light L1 is reflected by approximately 90 degrees at the second reflection surface 242, the elliptical shape of the first light L1 rotates by approximately 90 degrees about the first direction X. At this time, for the first light L1 on the upper surface 213a of the lid member 213, the major axis direction (fast axis direction) of the elliptical shape faces the second direction Y, and the length in the first direction X is shorter than the length in the second direction Y.

[0103] As shown in FIG. 8, for the second light L2 on the upper surface 213a of the lid member 213, the length in the first direction X is shorter than the length in the second direction Y. As an example of this, a case where the second light L2 has an elliptical shape can be cited.

[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 major axis direction (fast axis direction) passing through the major axis of the elliptical shape facing the third direction Z and a minor axis direction (slow axis direction) passing through the minor axis 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 shorter length in the second direction Y than in the third direction Z. On the other hand, when the second light L2 is reflected by approximately 90 degrees at the third reflection surface 243, the elliptical shape of the second light L2 rotates by approximately 90 degrees about the third direction Z as the axis. Therefore, the second light L2 reflected by the third reflection surface 243 and traveling toward the fourth reflection surface 244 has a minor axis direction (slow axis direction) facing the first direction X, and the length in the first direction X becomes shorter than the length in the third direction Z. Further, when the second light L2 is reflected by approximately 90 degrees at the fourth reflection surface 244, the elliptical shape of the second light L2 rotates by approximately 90 degrees about the first direction X as the axis. At this time, for the second light L2 on the upper surface 213a of the lid member 213, the major axis direction (fast axis direction) passing through the major axis of the elliptical shape faces the second direction Y, and the length in the first direction X is shorter than the length in the second direction Y.

[0105] As shown in FIG. 8, for the third light L3 on the upper surface 213a of the lid member 213, the length in the first direction X is shorter than the length in the second direction Y. As such an example, a case where the third light L3 has an elliptical shape can be cited.

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

[0107] On the upper surface 213a of the lid member 213, the light emitted from the plurality of light-emitting elements 220 is arranged in series, for example, in the second direction Y. In other words, the first light L1, the second light L2, and the third light L3 are arranged in a straight line with the major axis direction (fast axis direction) of each elliptical shape facing the second direction Y. Thereby, for example, when the light emitted from the light-emitting device 200 is made to enter another member, the length in the first direction X of the incident region of that member can be shortened. Examples of other members include a light guide plate.

[0108] At this time, "aligned 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 plurality of 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 the respective light-emitting elements 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, for example, in the second direction Y. In other words, the first light L1, the second light L2, and the third light L3 are aligned in a straight line with the direction (fast axis direction) passing through the major axis of each elliptical shape facing the second direction Y.

[0109] On the upper surface 213a of the lid member 213, the first light L1, the second light L2, and the third light L3 do not overlap each other. 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. Also, 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 emission surface of the plurality of light-emitting elements is reflected upward by one or more reflection members. Thereby, miniaturization of the light-emitting device 200 becomes possible.

[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 reflection plate 510, a diffusion sheet 530, a prism sheet 540, and a polarizing plate 550 as necessary. Hereinafter, a case where the light-emitting module 500 includes all of the reflection plate 510, the diffusion sheet 530, the prism sheet 540, and the polarizing plate 550 in addition to the light-emitting device 200 and the light guide plate 520 will be described.

[0112] The polarizing plate 550, the prism sheet 540, the diffusion sheet 530, the light guide plate 520, and the reflector 510 are laminated in this order in the first direction X. The 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 lid member 213 of the light emitting device 200 are incident. The light guide plate 520 is a member for causing the first light L1, the second light L2, and the third light L3 emitted from the light emitting device 200 to be surface-emitted.

[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, the side surface facing the light emitting device 200 becomes the 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 part of the light emitted from the light emitting device 200 and incident on the light guide plate 520 travels toward the light reflection surface 522 of the light guide plate 520. The light reflection surface 522 of the light guide plate 520 can have irregularities. Thereby, the light traveling toward the light reflection surface 522 of the light guide plate 520 can be reflected to the light extraction surface 521 and extracted. In FIG. 10, the arrows shown by solid lines indicate the directions of the light emitted from the light emitting module 500.

[0115] It is preferable that the optical axes of the first light L1, the second light L2, and the third light L3 emitted from the light emitting device 200 and the light reflection surface 522 of the light guide plate 520 are not parallel. As in the examples shown in FIGS. 9 and 10, it is preferable to mount the light guide plate 520 so that the upper surface 213a of the lid member 213 of the light emitting device 200 and the light reflection 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 a light-emitting device 200. FIG. 12 is a side view (part 2) illustrating a light-emitting module including a light-emitting device 200. As shown in the examples of FIGS. 11 and 12, the upper surface 213a of the lid member 213 of the light-emitting device 200 and the light incident surface 523a of the light guide plate 520 are perpendicular to each other, and the light reflecting surface 522 may be inclined so that the angle formed by the light reflecting surface 522 and the light incident surface 523a is an acute angle.

[0117] The angle formed by 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 or more and 30 degrees or less, and more preferably in the range of 10 degrees or more and 15 degrees or less. By doing so, it is possible to easily irradiate the entire light reflecting surface 522 of the light guide plate 520 with each light emitted from the light-emitting device 200.

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

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

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

[0121] As shown in FIG. 8, on the upper surface 213a of the lid member 213 of the light-emitting device 200, the first light L1, the second light L2, and the third light L3 are arranged in a straight line with the direction (fast axis direction) passing through the major axis of each elliptical shape facing the second direction Y. As a result, since the length in the first direction X of the first light L1, the second light L2, and the third light L3 becomes shorter, the thickness of the light guide plate 520 can be reduced. That is, the thickness of the light guide plate 520 may be set to be slightly thicker than the length in the slow axis direction of each light, so that the thickness of the light guide plate 520 can be reduced. As a result, the light-emitting module 500 can be made thinner and smaller.

[0122] The light-emitting module 500 can be used, for example, as a backlight light source. In addition to being a backlight light source, the light-emitting module 500 can be used in all devices such as optical disks, optical communication systems, projectors, displays, printing machines, or 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 described in the claims.

Explanation of Reference Numerals

[0124] 200 Light-emitting device 210 Package 211 Base 211a, 212a, 213a, 214a, 247, 248, 249 Upper surface 211b, 212b Lower surface 212 Frame portion 212c Inner surface 212d Outer surface 213 Lid member 214 Step portion 216 Wiring area 216A First wiring area 216B Second wiring area 216C Third wiring area 220 Light-emitting element 220A First light-emitting element 220B Second light-emitting element 220C Third light-emitting element 221 First emission surface 222 Second emission surface 223 Third emission surface 230 Submount 240 Reflective member 240A First reflective member 240B Second reflective member 240C Third reflective member 240D Fourth reflective member 241 First reflective surface 242 Second reflective surface 243 Third reflective surface 244 Fourth reflective surface 245 Fifth reflective surface 246 Sixth reflective surface 250 Protective element 250A First protective element 250B Second protective element 250C Third protective element 270 Wiring 500 Light-emitting module 510 Reflector 520 Light guide plate 521 Light extraction surface 522 Light reflecting surface 523 Side surface 523a Light incident surface 530 Diffusion sheet 540 Prism sheet 550 Polarizer

Claims

1. a base, a plurality of light-emitting elements including 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 which is disposed on the upper surface of the base, one or more reflecting members disposed on the upper surface of the base for reflecting the first light and the second light upward, the one or more reflecting members having a first reflecting surface for reflecting the first light, a second reflecting surface for reflecting the first light reflected by the first reflecting surface upward, and a third reflecting surface for reflecting the second light, the first light emitted from the first emission surface and traveling toward the first reflecting surface includes light traveling in a first direction parallel to the upper surface of the base, the first light reflected by the first reflecting surface and traveling toward the second reflecting surface includes light traveling in a second direction parallel to the upper surface of the base and perpendicular to the first direction, the first reflecting surface is disposed at a position where a first straight line, which is a virtual line passing through the first emission surface and perpendicular to the first emission surface, passes in a top view, the second reflecting surface is not disposed at the position where the first straight line passes in a top view, and the second reflecting surface is disposed between the first straight line and a second straight line, which is a virtual line passing through the second emission surface and perpendicular to the second emission surface, in the top view. A light-emitting device characterized by this.

2. a base, a plurality of light-emitting elements including 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 which is disposed on the upper surface of the base, one or more reflecting members disposed on the upper surface of the base for reflecting the first light and the second light upward, the one or more reflecting members having a first reflecting surface for reflecting the first light, a second reflecting surface for reflecting the first light reflected by the first reflecting surface upward, and a third reflecting surface for reflecting the second light, the first light emitted from the first emission surface and traveling toward the first reflecting surface includes light traveling in a first direction parallel to the upper surface of the base, the first light reflected by the first reflecting surface and traveling toward the second reflecting surface includes light traveling in a second direction parallel to the upper surface of the base and perpendicular to the first direction, the one or more reflecting members have one reflecting member including the second reflecting surface and the third reflecting surface. A light-emitting device characterized by this.

3. a base, a plurality of light-emitting elements including 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 which is disposed on the upper surface of the base; one or more reflecting members disposed on the upper surface of the base and reflecting the first light and the second light upward; a frame portion surrounding at least a part of the upper surface of the base and having an inner surface reaching above the upper surface; the one or more reflecting members have 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; the first light emitted from the first emission surface and traveling to the first reflecting surface includes light traveling in a first direction parallel to the upper surface of the base; the first light reflected by the first reflecting surface and traveling to the second reflecting surface includes light traveling in a second direction parallel to the upper surface of the base and perpendicular to the first direction; the light-emitting device, wherein the frame portion has a wiring region to which a plurality of wirings connected to the plurality of light-emitting elements are joined along each of two sides extending in the first direction.

4. the frame portion further has one or more stepped portions connected along the two sides; the light-emitting device according to claim 3, wherein the wiring regions are respectively provided on upper surfaces of the one or more stepped portions.

5. a base, a plurality of light-emitting elements including 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 which is disposed on the upper surface of the base; one or more reflecting members disposed on the upper surface of the base and reflecting the first light and the second light upward; the one or more reflecting members have 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, a third reflecting surface that reflects the second light, and a fourth reflecting surface that reflects the light reflected by the third reflecting surface upward; the first light emitted from the first emission surface and traveling to the first reflecting surface includes light traveling in a first direction parallel to the upper surface of the base; the first light reflected by the first reflecting surface and traveling to the second reflecting surface includes light traveling in a second direction parallel to the upper surface of the base and perpendicular to the first direction; The second light that is emitted from the second emission surface and travels toward the third reflection surface includes light traveling in the first direction. A light-emitting device, wherein the second light that is reflected by the third reflection surface and travels toward the fourth reflection surface includes light traveling in the second direction. **Claim 6** Further comprising a lid member disposed above the plurality of light-emitting elements and the one or more reflecting members. The lid member has a light-transmitting surface through which the first light and the second light reflected upward by the one or more reflecting members pass. The light-emitting device according to claim 5, wherein the length of the first light in the first direction on the light-transmitting surface is shorter than the length of the first light in the second direction on the light-transmitting surface. **Claim 7** The light-emitting device according to claim 6, wherein the first light that is emitted from the first emission surface and travels toward the first reflection surface has a length in the second direction that is shorter than the length in the direction perpendicular to the upper surface of the base. **Claim 8** The length of the second light in the first direction on the light-transmitting surface is shorter than the length of the second light in the second direction on the light-transmitting surface. The light-emitting device according to claim 6 or 7, wherein on the light-transmitting surface, the first light and the second light are arranged in series in the second direction. **Claim 9** The light-emitting device according to any one of claims 1 to 8, wherein the first direction is perpendicular to the first emission surface. **Claim 10** The light-emitting device according to any one of claims 1 to 9, wherein the plurality of light-emitting elements further includes a third light-emitting element that emits third light from a third emission surface. **Claim 11** The light-emitting device according to claim 10, wherein the first light-emitting element, the second light-emitting element, and the third light-emitting element emit red light, blue light, and green light, respectively. **Claim 12** The light-emitting device according to any one of claims 1 to 11, wherein the plurality of light-emitting elements are semiconductor laser elements. **Claim 13** A base, A plurality of light-emitting elements including 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 being disposed on the upper surface of the base. And one or more reflecting members disposed on the upper surface of the base and reflecting the first light and the second light upward. The one or more reflecting members have 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. The first light emitted from the first emission surface and traveling toward the first reflecting surface includes light traveling in a first direction parallel to the upper surface of the base. The light of the first light reflected by the first reflecting surface and traveling toward the second reflecting surface includes light traveling in a second direction parallel to the upper surface of the base and perpendicular to the first direction. A light emitting device characterized by this, or the light emitting device according to any one of claims 1 to 12, A light guide plate disposed above the light emitting device, and A light emitting module in which the light emitted from the light emitting device is emitted to the light guide plate.

Images