Light-emitting device and method for manufacturing the same

Abstract

This light-emitting device comprises: a first light-emitting element that emits first light having a first peak wavelength; a second light-emitting element that emits second light having a second peak wavelength whichdiffers from the first peak wavelength; and an optical control unit that receives first light and second light which have optical axes that are not parallel, and emits first light and second light which have parallel optical axes. The optical control unit comprises: one or two first optical members that form a first region that reflects the first light in a first optical path length, a second region that reflects the first light in a second optical path length longer than the first optical path length, and a third region that transmits the first light and reflects the second light; and a second optical member that has a reflective surface that reflects the second light.

Description

[Technical Field]

[0001] This disclosure relates to a light-emitting device and a method for manufacturing the same. [Background technology]

[0002] Patent Document 1 discloses a laser light source comprising a parallel plate prism that combines laser beams emitted from multiple semiconductor laser elements. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2002-204038 [Overview of the project] [Problems that the invention aims to solve]

[0004] There is a need to miniaturize light-emitting devices that emit light from multiple light-emitting elements with their optical axes parallel to each other. [Means for solving the problem]

[0005] In one embodiment, the light-emitting device of the present disclosure includes a first light-emitting element that emits first light having a first peak wavelength, a second light-emitting element that emits second light having a second peak wavelength different from the first peak wavelength, and an optical control unit that receives the first and second light whose optical axes are not parallel to each other and emits the first and second light whose optical axes are parallel to each other. The optical control unit includes one or two first optical members that form a first region that reflects the first light at a first optical path length, a second region that reflects the first light at a second optical path length which is longer than the first optical path length, and a third region that transmits the first light and reflects the second light, and a second optical member that has a reflective surface that reflects the second light.

[0006] In one embodiment, a method for manufacturing a light-emitting device of the present disclosure includes arranging a first light-emitting element that emits first light having a first peak wavelength and a second light-emitting element that emits second light having a second peak wavelength different from the first peak wavelength, and arranging an optical control unit into which the first and second lights, whose optical axes are not parallel to each other, are incident and which emits the first and second lights, whose optical axes are parallel to each other, wherein the arrangement of the optical control unit includes arranging one or two first optical members that form a first region that reflects the first light at a first optical path length, a second region that reflects the first light at a second optical path length which is longer than the first optical path length, and a third region that transmits the first light and reflects the second light, and arranging a second optical member having a reflective surface that reflects the second light after arranging the first optical members. [Effects of the Invention]

[0007] The light-emitting device described herein makes it possible to miniaturize a light-emitting device that emits light with the optical axes of multiple light-emitting elements parallel to each other. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the light-emitting device according to the first embodiment. [Figure 2] Figure 2 is a perspective view of the light-emitting device according to the first embodiment, with the package cap removed. [Figure 3] Figure 3 is a top view of the light-emitting device according to the first embodiment, with the package cap removed. [Figure 4] Figure 4 is a cross-sectional view of the light-emitting device along the line IV-IV in Figure 1. [Figure 5] Figure 5 is an enlarged top view of the inside of the package according to the first embodiment. [Figure 6A] Figure 6A is a graph showing an example of the reflectance characteristics of the first region of the optical control unit according to the first embodiment. [Figure 6B]FIG. 6B is a graph showing an example of the reflectance characteristics of the second region of the light control unit according to the first embodiment. [Figure 6C] FIG. 6C is a graph showing an example of the reflectance characteristics of the third region of the light control unit according to the first embodiment. [Figure 6D] FIG. 6D is a graph showing an example of the reflectance characteristics of the fourth region of the light control unit according to the first embodiment. [Figure 7] FIG. 7 is a diagram schematically showing the transmission and reflection of light by the reflecting surface formed by the optical member in the light control unit according to the first embodiment. [Figure 8] FIG. 8 is a diagram showing examples of the transmission and reflection of first light and second light having different peak wavelengths in a modified example of the light control unit according to the first embodiment. [Figure 9] FIG. 9 is a diagram showing other examples of the transmission and reflection of first light and second light having different peak wavelengths in a modified example of the light control unit according to the first embodiment. [Figure 10] FIG. 10 is a perspective view of the light-emitting device according to the second embodiment. [Figure 11] FIG. 11 is a perspective view of the light-emitting device according to the second embodiment excluding the package cap. [Figure 12] FIG. 12 is a top view of the light-emitting device according to the second embodiment excluding the package cap. [Figure 13] FIG. 13 is a cross-sectional view of the light-emitting device taken along the XIII-XIII cross-sectional line of FIG. 10. [Figure 14] FIG. 14 is a diagram schematically showing the transmission and reflection of light by the reflecting surface formed by the optical member in the light control unit according to the second embodiment. [Figure 15] FIG. 15 is a diagram showing examples of the transmission and reflection of first light and second light having different peak wavelengths in a modified example of the light control unit according to the second embodiment. [Figure 16] FIG. 16 is a diagram showing other examples of the transmission and reflection of first light and second light having different peak wavelengths in a modified example of the light control unit according to the second embodiment. [Figure 17]FIG. 17 is a top view of a modified example of the light-emitting device according to the first embodiment, excluding the cap of the package. [Figure 18] FIG. 18 is a top view of a modified example of the light-emitting device according to the second embodiment, excluding the cap of the package. [Figure 19A] FIG. 19A is a diagram schematically showing the positions of the optical axes of the respective lights incident on the light-incident surface of the light control unit 50. [Figure 19B] FIG. 19B is a diagram schematically showing the positions of the optical axes of the respective lights emitted from the light-emitting surface of the light control unit 50. [Figure 20] FIG. 20 is a schematic side view of a head-mounted display including the light-emitting device according to the embodiment of the present disclosure.

MODE FOR CARRYING OUT THE INVENTION

[0009] In this specification or the claims, polygons such as triangles and quadrilaterals are not limited to polygons with a mathematically strict meaning, and also include shapes obtained by processing such as rounding, chamfering, angling, and rounding at the corners of the polygon. Also, not limited to the corners (ends of the sides) of the polygon, shapes obtained by processing the middle part of the side are also called polygons. That is, shapes obtained by partially processing while leaving the polygon as a base are included in the "polygon" described in this specification and the claims.

[0010] The same applies not only to polygons but also to words representing specific shapes such as trapezoids, circles, and concavities and convexities. The same also applies when handling each side forming the shape. That is, even if a side has been processed at the corner or the middle part, the "side" includes the processed part. When distinguishing a "polygon" or "side" without partial processing from the processed shape, "strict" is added, for example, it is described as "strict quadrilateral" and the like.

[0011] In this specification or in the claims, if there are multiple elements identified by a certain name, and to distinguish each element, an ordinal number such as "first" or "second" may be added to the beginning of each element's name. For example, if the claim states that "a light-emitting element is arranged on a substrate," the specification may state that "a first light-emitting element and a second light-emitting element are arranged on a substrate." The ordinal numbers "first" and "second" are simply used to distinguish the two light-emitting elements. The order of these ordinal numbers has no special meaning. Element names with the same ordinal number may not refer to the same element in the specification and in the claims. For example, if elements identified by the terms "first light-emitting element," "second light-emitting element," and "third light-emitting element" are described in the specification, the "first light-emitting element" and "second light-emitting element" in the claims may correspond to the "first light-emitting element" and "third light-emitting element" in the specification. Furthermore, if the term "first light-emitting element" is used in claim 1 as described in the patent claims, and the term "second light-emitting element" is not used, the invention according to claim 1 only needs to have one light-emitting element, and that light-emitting element is not limited to the "first light-emitting element" in the specification, but may be a "second light-emitting element" or a "third light-emitting element".

[0012] In this specification or in the claims, terms indicating specific directions or positions (e.g., “up,” “down,” “right,” “left,” “front,” “back,” and other terms including these) may be used. These terms are used merely for clarity to indicate the relative directions or positions in the referenced drawings. As long as the relative directions or positions expressed by terms such as “up,” “down,” etc., in the referenced drawings are the same, the arrangement in drawings other than those disclosed, actual products, manufacturing equipment, etc., does not have to be identical to that in the referenced drawings.

[0013] The dimensions, dimensional ratios, shapes, and spacing of elements or components shown in the drawings may be exaggerated for clarity. Furthermore, some elements may be omitted from the drawings to avoid excessive complexity.

[0014] Embodiments of the present invention will be described below with reference to the drawings. While these embodiments embody the technical concept of the present invention, they do not limit it. The numerical values, shapes, materials, steps, and the order of those steps shown in the description of the embodiments are merely examples, and various modifications are possible as long as they do not create a technical inconsistency. In the following description, elements identified by the same name and reference numerals are identical or of the same type, and redundant explanations of these elements may be omitted.

[0015] <First Embodiment> A light-emitting device 100 according to the first embodiment will be described. Figures 1 to 9 are drawings illustrating an exemplary form of the light-emitting device 100. Figure 1 is a perspective view of the light-emitting device 100 according to this embodiment. Figure 2 is a perspective view of the light-emitting device 100 with the cap 16 of the package 10 removed. Figure 3 is a top view in the same state as Figure 2. Figure 4 is a cross-sectional view along the IV-IV section line in Figure 1. Figure 5 is an enlarged top view of the inside of the package 10. Figures 6A to 6D are graphs showing examples of reflectance characteristics of the first to fourth regions of the optical control unit 50, respectively. Figure 7 is a schematic diagram showing the transmission and reflection of light by the reflective surface formed by the optical member in the optical control unit 50. Figure 8 is a diagram showing examples of transmission and reflection of first and second light with different peak wavelengths. Figure 9 is a diagram showing other examples of transmission and reflection of first and second light with different peak wavelengths.

[0016] The light-emitting device 100 according to this embodiment comprises a package 10, a plurality of light-emitting elements 20, one or more submounts 30, a lens member 40, a light control unit 50, one or more protective elements 60A, a temperature measuring element 60B, a plurality of wirings 70, and a substrate 90, among other components.

[0017] In the illustrated example of the light-emitting device 100, three light-emitting elements 20, a submount 30, three protective elements 60A, a temperature measuring element 60B, and multiple wires 70 are arranged in the space inside the package 10. The light emitted from the three light-emitting elements 20 is then exited from the package 10 and collimated by the lens member 40. The light emitted from the lens member 40 enters the optical control unit 50 with its optical axis not parallel to that of the other light. The optical control unit 50 emits light with its optical axis parallel to that of the other light.

[0018] First, let's explain each component.

[0019] (Package 10) The package 10 has a base portion 11 that includes a mounting surface 11M, and side wall portions 12. In a top view, the outer shape of the package 10 is rectangular. The outer shape of the package 10 does not have to be rectangular; for example, it may be a polygon other than a quadrilateral or a circle.

[0020] The mounting surface 11M is a flat surface, and one or more components of the light-emitting device 100 are arranged on the mounting surface 11M. The side wall portion 12 surrounds the mounting surface 11M and extends above the mounting surface 11M. One or more components placed on the mounting surface 11M are surrounded by the side wall portion 12. The package 10 also has a top surface portion. The top surface portion is above the mounting surface 11M and connects with the side wall portion 12. The top surface portion is positioned directly above one or more components placed on the mounting surface 11M.

[0021] Package 10 has multiple wiring areas 14 for electrical connections. The multiple wiring areas 14 are provided on the mounting surface 11M. In Figure 5, instead of labeling all wiring areas 14 with reference numerals, all wiring areas 14 are given the same hatching. The multiple wiring areas 14 can be electrically connected to wiring areas provided on the lower surface of the base 11 (the surface opposite to the mounting surface 11M) via via holes passing through the interior of the base 11. The wiring areas electrically connected to the wiring areas 14 are not limited to the lower surface of the base 11, but may also be provided on other outer surfaces (top surface or outer side surface) of the package 10.

[0022] The package 10 has a light extraction surface 10A. The light extraction surface 10A can be one of one or more outer surfaces that make up the side wall portion 12. The light extraction surface 10A is perpendicular to a plane parallel to the mounting surface 11M. Here, perpendicularity includes a difference of ±5 degrees. The light extraction surface 10A may be inclined with respect to a plane parallel to the mounting surface 11M.

[0023] At least a portion of the light extraction surface 10A is translucent. This translucent region will be called the translucent region 13 (see Figure 4 for reference numeral 13). Here, "translucent" means that the transmittance of the main light incident thereon is 80% or more. The translucent region 13 may span multiple outer surfaces of the package 10.

[0024] Furthermore, the light-transmitting regions in package 10 are not limited to the light-transmitting region 13. For example, a light-transmitting region may be provided on a surface different from the light-extracting surface 10A, separated from the light-transmitting region 13. Package 10 may also have non-light-transmitting regions (regions that do not transmit light).

[0025] In the illustrated example of package 10, only one of the multiple outer surfaces of the side wall portion 12 is the light extraction surface 10A. Package 10 has four outer surfaces corresponding to a rectangular shape, and all four surfaces are light-transmitting.

[0026] Package 10 can consist of a substrate 15 and a cap 16 fixed to the substrate 15. It may also include other components. The substrate 15 has a base portion 11, and the cap 16 has a side wall portion 12 and a top surface portion. The substrate 15 is flat. The cap 16 has a concave shape with a recess. The outer shape of the cap 16 is rectangular when viewed from above. The outer shape of the cap 16 does not have to be rectangular; for example, it may be a polygon other than a quadrilateral or a circle.

[0027] The cap 16 is bonded to the substrate 15, forming the internal space of the package 10. A peripheral region 11P is provided on the mounting surface 11M of the substrate 15. The peripheral region 11P is provided around the area on the mounting surface 11M where other components are arranged. The peripheral region 11P is provided around multiple wiring regions 14. The cap 16 is bonded to the peripheral region 11P of the substrate 15. A metal film for bonding may be provided in the peripheral region 11P. The internal space of the package 10 becomes a sealed space. The internal space of the package 10 is in an airtight state.

[0028] The cap 16 can be formed from, for example, a translucent material. Only the side walls 12 of the cap 16 may be formed from a translucent material. For example, the top surface may be formed from an opaque material.

[0029] The substrate 15 can be formed using ceramic as the main material. Examples of ceramics that can be used as the main material for the substrate 15 include aluminum nitride, silicon nitride, aluminum oxide, and silicon carbide. The substrate 15 can be formed from a ceramic substrate having a plurality of metal vias inside. The plurality of wiring regions 14 can be formed from a conductor such as a metal and can be a patterned metal film.

[0030] The cap 16 can be manufactured from a translucent material such as glass, plastic, or quartz, using processing techniques such as molding or etching. The cap 16 may also be formed by joining together a top surface and side wall 12 made from different materials as the main material. For example, the top surface may be made primarily from single-crystal or polycrystalline silicon, and the side wall may be made primarily from glass.

[0031] The internal space of the package 10 is not limited to being formed by a flat plate-shaped member having a mounting surface 11M and a concave-shaped member, such as a substrate 15 and a cap 16. For example, the internal space of the package 10 may be formed by a concave-shaped member having a mounting surface 11M and a flat plate-shaped member. Alternatively, the internal space of the package 10 may be formed by two concave-shaped members, one of which has a mounting surface 11M.

[0032] Hereafter, in order to distinguish between substrate 15 and substrate 90, they may be referred to as the first substrate 15 and the second substrate 90, respectively.

[0033] (Light-emitting element 20) An example of the light-emitting element 20 is a semiconductor laser element. The light-emitting element 20 may have a rectangular shape when viewed from above. If the light-emitting element 20 is an end-face emission type semiconductor laser element, the side that intersects with one of the two short sides of this rectangle is the light-emitting end face (light-emitting surface 21). In this example, the top and bottom surfaces of the light-emitting element 20 have a larger area than the light-emitting surface 21. The light-emitting element 20 is not limited to an end-face emission type semiconductor laser element, but may also be a surface-emitting type semiconductor laser element or a light-emitting diode (LED). In the illustrated example of the light-emitting device 100, an end-face emission type semiconductor laser element is used as the light-emitting element 20.

[0034] The light-emitting element 20 is, for example, a single emitter having one emitter. However, the light-emitting element 20 may also be a multi-emitter having two or more emitters. If the light-emitting element 20 is a semiconductor laser element having multiple emitters, a common electrode can be provided on either the upper or lower surface of the light-emitting element 20, and electrodes corresponding to each emitter can be provided on the other surface.

[0035] The light emitted from the light-emitting surface 21 of the light-emitting element 20 is divergent light with a broad spread. However, it does not have to be divergent light. If the light-emitting element 20 is a semiconductor laser element, the divergent light (laser light) emitted from the semiconductor laser element forms an elliptical far-field pattern (hereinafter referred to as "FFP") on a plane parallel to the light-emitting surface. FFP is the shape and light intensity distribution of the emitted light at a position away from the light-emitting surface.

[0036] Light passing through the center of the elliptical shape of the FFP, in other words, light with peak intensity in the FFP's light intensity distribution, will be called light traveling along the optical axis. The optical path of light traveling along the optical axis will be called the optical axis of that light. Furthermore, in the FFP's light intensity distribution, 1 / e of the peak intensity value. 2 Light with the above intensity will be referred to as "main portion" light.

[0037] In the elliptical shape of the FFP of light emitted from the light-emitting element 20, which is a semiconductor laser element, the direction of the minor axis of the ellipse is called the "slow axis direction," and the direction of the major axis is called the "fast axis direction." Multiple layers, including the active layer, that constitute the semiconductor laser element are stacked in the direction of the fast axis direction.

[0038] Based on the light intensity distribution of the FFP, 1 / e of the peak intensity value of the light intensity distribution 2 The angle corresponding to the intensity is defined as the beam angle of the light emitted by the semiconductor laser element. The beam angle in the fast axis direction is sometimes called the vertical beam angle, and the beam angle in the slow axis direction is sometimes called the parallel beam angle.

[0039] As the light-emitting element 20, for example, a semiconductor laser element that emits blue light, a semiconductor laser element that emits green light, or a semiconductor laser element that emits red light can be used. Alternatively, a semiconductor laser element that emits other types of light may be used.

[0040] Here, blue light is defined as light whose emission peak wavelength is in the range of 420 nm to 494 nm. Green light is defined as light whose emission peak wavelength is in the range of 495 nm to 570 nm. Red light is defined as light whose emission peak wavelength is in the range of 605 nm to 750 nm.

[0041] Examples of semiconductor laser elements that emit blue light or green light include semiconductor laser elements containing nitride semiconductors. Examples of nitride semiconductors that can be used include GaN, InGaN, and AlGaN. Examples of semiconductor laser elements that emit red light include those containing InAlGaP, GaInP, GaAs, and AlGaAs semiconductors.

[0042] (Submount 30) The submount 30 has two joining surfaces and is constructed in the shape of a rectangular parallelepiped. The other joining surface is located opposite the first joining surface. The distance between the two joining surfaces is smaller than the distance between any other opposing surfaces. The shape of the submount 30 is not limited to a rectangular parallelepiped. The submount 30 can be formed using, for example, aluminum nitride or silicon carbide. A metal film for joining is provided on the joining surfaces.

[0043] (Lens component 40) The lens member 40 is formed having one or more lens surfaces. The lens member 40 also collimates incident light. For example, one or more lens surfaces are designed to receive light diverging from the focal point, convert the diverging light into collimated light through refraction, and emit it from the lens member 40. The lens surfaces are spherical or aspherical. Lens surfaces are formed on the surface of the lens member 40 on the light incident side and / or the light exit side. Optical films such as anti-reflective films or protective films may be provided on the surface of the lens member 40 on the light incident side and / or the light exit side. In the illustrated example of the lens member 40, a concave lens surface is formed on the light incident side and a convex lens surface is formed on the light exit side. Note that multiple lens surfaces may be formed on the surface on the light incident side, and the lens member 40 may have one or more lens surfaces on the light incident side. Also, multiple lens surfaces may be formed on the surface on the light exit side, and the lens member 40 may have one or more lens surfaces on the light exit side.

[0044] The lens member 40 may be formed from a light-transmitting material, such as glass or plastic. The shape of the portion of the lens member 40 that does not transmit light is arbitrary, but it is preferable that it has a shape that can be fixed to other components. In the illustrated example of the lens member 40, the lens member 40 has a flat bottom surface when the optical axis extends in a direction parallel to the bottom surface, and this bottom surface can function as a bonding surface.

[0045] (Optical control unit 50) The optical control unit 50 controls multiple beams of light whose optical axes are not parallel to each other so that they become multiple beams of light whose optical axes are parallel to each other. The optical control unit 50 comprises multiple optical elements. The optical control unit 50 uses multiple optical elements to perform optical control by combining selective reflection and selective transmission to align the optical axes of the beams of light parallel to each other. Furthermore, it emits the multiple beams of light as coaxial light.

[0046] Each of the multiple optical members has a flat plate shape. However, they do not have to be flat plates. The multiple optical members include one or two first optical members. The first optical members have the property of transmitting light in a predetermined wavelength range. The multiple optical members include a second optical member 56 or a third optical member 57. The second optical member 56 or the third optical member 57 has the property of reflecting light in a predetermined wavelength range.

[0047] In the illustrated example of a light-emitting device, the light control unit 50 comprises two first optical elements 55a and 55b, a second optical element 56, and a third optical element 57. Note that the number of first optical elements does not necessarily have to be two; it may be implemented using one "first optical element." Therefore, one or two "first optical elements" may be collectively referred to as the first optical element 55.

[0048] Multiple light sources incident on the optical control unit 50 are light sources with different peak wavelengths. Alternatively, multiple light sources incident on the optical control unit 50 are light sources of different colors. Multiple optical components form multiple regions (optical control regions) that selectively perform optical control on multiple light sources.

[0049] The first optical member 55 forms multiple optical control regions for performing optical control. The optical control by the first optical member 55 is performed selectively on multiple lights. For example, optical control can be performed such as reflecting one of the multiple lights and transmitting another.

[0050] The second optical member 56 forms one or more light control regions for performing optical control. The optical control by the second optical member 56 is performed selectively on at least one light. The third optical member 57 forms one or more light control regions for performing optical control. The optical control by the third optical member 57 is performed selectively on at least one light.

[0051] The light control region can be formed on the surface of the optical component, preferably a flat and smooth surface. For example, it can be formed by depositing a dielectric multilayer film on the surface (main surface) of the transparent body of the optical component, which is made of a transparent material such as glass or plastic that transmits visible light, by thin-film deposition techniques such as sputtering. The optical component 55 can be composed of, for example, a dichroic mirror.

[0052] (Protection element 60A) The protection element 60A is a circuit element designed to prevent excessive current from flowing through a specific element (e.g., the light-emitting element 20) and causing it to be damaged. A typical example of the protection element 60A is a constant voltage diode such as a Zener diode. A Si diode can be used as the Zener diode.

[0053] (Temperature measuring element 60B) The temperature measuring element 60B is an element used as a temperature sensor to measure the ambient temperature. For example, a thermistor can be used as the temperature measuring element 60B.

[0054] (Wiring 70) The wiring 70 is composed of a conductor having a linear shape with joints at both ends. In other words, the wiring 70 has joints at both ends of the linear portion for joining with other components. The wiring 70 is, for example, a metal wire. Examples of metals include gold, aluminum, silver, and copper.

[0055] (Second board 90) The second substrate 90 has multiple wiring regions. The wiring regions of the second substrate pass through the interior of the second substrate 90 and are electrically connected to wiring regions provided on the lower surface of the second substrate 90. The wiring regions electrically connected to the wiring regions located on the upper surface of the second substrate 90 are not limited to the lower surface of the second substrate 90, but can also be provided on other outer surfaces (top surface and outer side surfaces) of the second substrate 90.

[0056] The second substrate 90 can be formed using ceramic as the main material. Examples of ceramics used in the second substrate 90 include aluminum nitride, silicon nitride, aluminum oxide, and silicon carbide.

[0057] The second substrate 90 preferably includes a portion formed from a material with better heat dissipation properties than ceramic (a material with high thermal conductivity). In the example of the second substrate 90, the second substrate 90 may have a heat conductive member embedded inside. This heat conductive member fills an opening that penetrates from the top surface to the bottom surface of the second substrate 90. The heat conductive member is provided in a region facing the bottom surface of the first substrate 15. The heat conductive member can be formed from the aforementioned material with high thermal conductivity. The shape of the heat conductive member is arbitrary.

[0058] The second substrate 90 has a structure that supports the components of the light-emitting device 100 and can be electrically connected to the electronic components included in these components. The second substrate 90 may also support elements other than the components of the light-emitting device 100, such as electronic components or optical components.

[0059] (Light-emitting device 100) Next, the light-emitting device 100 will be described.

[0060] In the light-emitting device 100, multiple light-emitting elements 20 are arranged in the internal space of the package 10. For example, if the internal space of the package 10 is hermetically sealed, quality degradation due to dust collection of the light-emitting elements 20 can be suppressed. Such a sealing structure is preferable, for example, when the light-emitting elements 20 are semiconductor laser elements. However, the light-emitting elements 20 do not necessarily have to be arranged in a sealed internal space.

[0061] Multiple light-emitting elements 20 are arranged on the mounting surface 11M. The multiple light-emitting elements 20 emit light toward the side wall portion 12. The multiple light-emitting elements 20 emit light with different peak wavelengths from each other. The multiple light-emitting elements 20 emit light of different colors from each other. The light emitted from the light-emitting surface 21 of each of the multiple light-emitting elements 20 is emitted from the translucent region 13 of the light-extracting surface 10A.

[0062] Multiple light-emitting elements 20 are arranged side by side so that their light-emitting surfaces 21 face the light-extracting surface 10A. The multiple light-emitting elements 20 are arranged side by side so that their respective light-emitting surfaces 21 are parallel. The direction in which the multiple light-emitting elements 20 are arranged is referred to as the first direction.

[0063] Light traveling along the optical axis emitted from multiple light-emitting elements 20 travels in a direction parallel to the mounting surface 11M from the light-emitting surface 21. Light traveling along the optical axis emitted from multiple light-emitting elements 20 travels in a direction parallel to the mounting surface 11M from the light-extraction surface 10A. Here, parallelism includes a difference of ±3 degrees. The direction in which the light traveling along the optical axis emitted from the light-emitting elements 20 travels from the light-extraction surface 10A shall be called the second direction.

[0064] The light extraction surface 10A is perpendicular to the second direction of light traveling along the optical axis emitted from at least one light-emitting element 20. However, the light extraction surface 10A does not necessarily have to be perpendicular to the optical axis.

[0065] In the illustrated example of the light-emitting device 100, the first direction coincides with the direction of the 1D arrow indicated in the figure (hereinafter referred to as the 1D direction). The second direction of each of the multiple light-emitting elements 20 coincides with the direction of the 2D arrow indicated in the figure (hereinafter referred to as the 2D direction). In a top view, the light extraction surface 10A is parallel to the 1D direction.

[0066] In the illustrated example of the light-emitting device 100, the multiple light-emitting elements 20 are composed of three semiconductor laser elements. Here, the light emitted from the three light-emitting elements 20 are referred to as the first light, the second light, and the third light, respectively. The peak wavelengths of the first light, the second light, and the third light are referred to as the first peak wavelength, the second peak wavelength, and the third peak wavelength, respectively. The first light, the second light, and the third light are light of different colors selected from red light, green light, and blue light, respectively. In the arrangement of three light-emitting elements 20 in a first direction, the centrally located light-emitting element 20 emits green first light, and the two light-emitting elements 20 located on either side of this element emit red second light and blue third light, respectively. This configuration, in which the three light-emitting elements 20 are composed of RGB light, can be used, for example, for color image display applications. Note that the color of the light emitted by each light-emitting element 20 is not limited to these, nor is it limited to visible light. In the diagram, the optical path of the first light traveling along the optical axis is shown as a solid line, the optical path of the second light traveling along the optical axis is shown as a dashed line, and the optical path of the third light traveling along the optical axis is shown as a dotted line. Additionally, the first light is labeled "G", the second light as "R", and the third light as "B".

[0067] In the light-emitting device 100, one or more submounts 30 arrange multiple light-emitting elements 20. The submount 30 is bonded to the light-emitting elements 20 on one bonding surface and to the mounting surface 11M on the other bonding surface. In the illustrated example of the light-emitting device 100, multiple light-emitting elements 20 are arranged on one submount 30. Alternatively, the multiple light-emitting elements 20 may be arranged directly on the mounting surface 11M without going through the submount 30.

[0068] In the light-emitting device 100, one or more protective elements 60A are arranged inside the package 10. Each protective element 60A is located on the mounting surface 11M. Each protective element 60A is located in a different wiring area 14. The light-emitting elements 20 are protected by the protective elements 60A. In the illustrated example of the light-emitting device 100, multiple protective elements 60A are provided in a one-to-one relationship for multiple light-emitting elements 20.

[0069] In the light-emitting device 100, the temperature measuring element 60B is located inside the package 10. The temperature measuring element 60B is located on the mounting surface 11M. The temperature measuring element 60B is located in the wiring area 14 where the protective element 60A is not located. The temperature measuring element 60B is provided in the light-emitting device 100 for the purpose of measuring the temperature of the light-emitting element 20.

[0070] In the light-emitting device 100, the wiring 70 connects to the wiring area 14 of the package 10 on the side of the light-emitting element 20 (the side including the side opposite to the light-emitting element 21 of the light-emitting element 20), with a straight line parallel to the light-emitting surface 21 of the light-emitting element 20 as the boundary when viewed from above. This makes it easier to avoid the wiring 70 interfering with the optical path of the light.

[0071] In the light-emitting device 100, the package 10 is placed on the second substrate 90. The bottom surface of the package 10 is mounted on the mounting surface of the second substrate 90, and the package 10 is supported by the second substrate 90. The bottom surface of the package 10 may also be the bottom surface of the first substrate 15.

[0072] Each of the light-emitting element 20, the protective element 60A, and the temperature measuring element 60B is electrically connected to the second substrate 90 via the wiring region 14. Furthermore, the second substrate 90 can be electrically connected to external circuits of the light-emitting device 100 via multiple wiring regions.

[0073] In the light-emitting device 100, the length of the second substrate 90 in the second direction is greater than the length in the first direction. Also, the length of the short side or the length in the first direction of the second substrate 90 is 1 / 2 or less of the length of the long side or the length in the second direction. As will be described in detail later, when the light-emitting device 100 is mounted on the head-mounted display 300 as shown in Figure 20, it is preferable that the length in the first direction is shorter.

[0074] Hereafter, in order to distinguish between the mounting surface 11M of the first substrate 15 and the mounting surface of the second substrate 90, they may be referred to as the first mounting surface 11M and the second mounting surface, respectively.

[0075] In the light-emitting device 100, the lens member 40 is placed on the second substrate 90. The lens member 40 is mounted on the second mounting surface and is supported by the second substrate 90. The lens member 40 may also be mounted on the first substrate 15. Referring to the illustrated light-emitting device 100, for example, if the first substrate 15 is made the same size as the second substrate 90 and extended to the position where the lens member 40 is placed, the lens member 40 can be mounted on the first substrate 15.

[0076] The lens component 40 is positioned on the outside of the package 10. Therefore, the lens component 40 is not surrounded by the side wall portion 12. By not positioning the lens component 40 in the internal space of the package 10, the size of the package 10 in the height direction (direction perpendicular to the mounting surface 11M) can be reduced, which can contribute to miniaturization of the light-emitting device 100.

[0077] Light emitted from the multiple light-emitting elements 20 and emitted from the light extraction surface 10A to the outside of the package 10 is incident on the lens member 40. The main portion of the light emitted from the multiple light-emitting elements 20 is incident on the lens member 40. Furthermore, portions of the light emitted from the multiple light-emitting elements 20 other than the main portion may also be incident on the lens member 40.

[0078] Light emitted from multiple light-emitting elements 20 and exiting the package 10 from the translucent region 13 is incident on the lens member 40 and exits from a single lens surface. The light from the multiple light-emitting elements 20 incident on the incident surface of the lens member 40 becomes collimated light and exits from the exit surface of the lens member 40. By collimating the light from multiple light-emitting elements 20 with a single lens surface, the spacing between each light-emitting element 20 can be narrowed, which can contribute to miniaturization of the light-emitting device 100. Alternatively, the light from multiple light-emitting elements 20 may be incident on a lens member having multiple lens surfaces.

[0079] The lower surface of the lens member 40 is below the plane including the first mounting surface 11M. A portion of the main light emitted from the light extraction surface 10A passes below the plane including the first mounting surface 11M at a position closer to the light extraction surface 10A than the incident surface of the lens member. By bonding the package 10 and the lens member 40 to the second substrate 90, the lower surface of the lens member 40 can be positioned lower than the mounting surface 11M, and light traveling at a position lower than the plane including the mounting surface 11M can be incident on the lens member 40.

[0080] In the lens member 40, the optical axis of the lens surface from which light is emitted and the optical axis of the light extracted from the light extraction surface 10A are at the same height from the mounting surface 11M of the base 11. In the lens member 40, the optical axis of the lens surface from which light is emitted is parallel to the second direction.

[0081] In the illustrated example of the light-emitting device 100, the light emitted from the multiple light-emitting elements 20 is emitted from the lens member 40 as collimated light, with the direction in the speed axis direction (perpendicular to the mounting surface 11M) being collimated. The lens member 40 has a single lens surface that collimates the first light G, the second light R, and the third light B. The optical axis of the first light G passes through the optical axis of the lens member 40.

[0082] In the light-emitting device 100, the light control unit 50 is arranged on the second substrate 90. The light control unit 50 is mounted on the second mounting surface and is supported on the second mounting surface. Alternatively, the light control unit 50 may be mounted on the first substrate 15.

[0083] Light emitted from multiple light-emitting elements 20 is incident on the light control unit 50. Multiple beams of light whose optical axes are not parallel to each other are incident on the light control unit 50. Light that has passed through the lens member 40 and been collimated is incident on the light control unit 50.

[0084] The optical control unit 50 converts multiple beams of light that are not parallel to each other's optical axes, which are incident on the optical control unit 50, into multiple beams of light whose optical axes are parallel to each other and emits them. Here, parallelism includes a difference of ±3 degrees. The optical control unit 50 emits the multiple beams of light that were incident on it, with their optical axes coaxial. The optical control unit 50 emits the light from the main portion emitted from the multiple light-emitting elements 20.

[0085] The optical control unit 50 emits multiple optical axes parallel to the second direction. Here, parallelism includes a difference of ±3 degrees. Note that the optical axes of the multiple light beams emitted from the optical control unit 50 do not necessarily have to be parallel to the second direction. The multiple light beams emitted from the optical control unit 50 travel away from the package 10.

[0086] The multiple light control regions of the light control unit 50 are inclined with respect to a straight line parallel to the second direction when viewed from above. Here, as illustrated in Figure 7, this inclination angle is represented by θ. Note that in Figure 7, for simplicity, only the inclination angle θ of the reflective surface 56M is shown as a representative example. The inclination angle θ of the multiple light control regions can be set, for example, in the range of 35° to 70°.

[0087] The multiple optical elements of the optical control unit 50 are arranged in a diagonal direction with respect to the second direction when viewed from above. Two adjacent optical elements satisfy the following relationship when viewed from above: one optical element is not positioned on a virtual straight line passing through the optical control region of the other optical element, and the other optical element is not positioned on a virtual straight line passing through the optical control region of the other optical element. This relationship is satisfied for all optical elements that form an optical control region. Arranging multiple optical elements of similar shapes side by side makes implementation easier.

[0088] In the illustrated example of the light-emitting device 100, the first light G, the second light R, and the third light B, having passed through one lens surface of the lens member 40, are incident on the light control unit 50. The light control unit 50 comprises four optical members, and the first light G, the second light R, and the third light B, whose optical axes are parallel to each other, are emitted from the light control unit 50. The inclination angle θ of all light control regions is in the range of 50° to 75°. By making the inclination angle θ greater than 45°, the size of the light control unit 50 in the second direction or 2D direction can be reduced.

[0089] In the example shown in Figure 3, the first optical member 55 is composed of two first optical members 55a and 55b, which are arranged facing each other with a gap in between. However, the configuration of the optical control unit 50 is not limited to this example. A transparent member may be present between the two first optical members 55a and 55b. For example, a transparent resin layer may be present. The two first optical members 55a and 55b may be joined by a transparent member to form a single continuous component.

[0090] Here, based on the illustrated example of the light-emitting device 100, the mechanism by which the light control unit 50 controls the first light G, the second light R, and the third light B will be explained.

[0091] The optical control unit 50, which controls the three lights, comprises two first optical members 55a and 55b, a second optical member 56, and a third optical member 57. The first optical member 55 forms at least four optical control regions. Here, the four optical control regions will be distinguished and referred to as the first region 51, the second region 52, the third region 53, and the fourth region 54.

[0092] Each of the two first optical members 55a and 55b has a first surface facing the lens member 40 and a second surface on the opposite side. Four light control regions are provided on the first and second surfaces of the two first optical members 55a and 55b.

[0093] The first region 51 and the second region 52 are provided on different first optical members 55a and 55b, respectively. The third region 53 and the fourth region 54 are provided on different first optical members 55a and 55b, respectively.

[0094] The first region 51 and the third region 53 are provided on different surfaces of the same first optical member 55a. The third region 53 is formed on the first surface of the first optical member 55a, and the first region 51 is formed on the second surface. The second region 52 and the fourth region 54 are provided on different surfaces of the same first optical member 55b. The second region 52 is formed on the first surface of the first optical member 55b, and the fourth region 54 is formed on the second surface.

[0095] The second optical member 56 has a reflective surface 56M. The third optical member 57 has a reflective surface 57M. The reflective surfaces 56M and 57M are positioned opposite each other with the first optical member 55 in between. The first optical member 55 is positioned between the plane containing the reflective surface 56M of the second optical member 56 and the plane containing the reflective surface 57M of the third optical member 57.

[0096] Figures 6A to 6D are schematic graphs illustrating the reflectance-transmittance characteristics of the first optical element 55 in multiple optical control regions. The vertical axis represents reflectance, and the horizontal axis represents wavelength. The labels "B," "G," and "R" on the horizontal axis schematically indicate the central wavelengths of the wavelength ranges containing blue, green, and red light, respectively. For example, in a dichroic mirror having the reflectance-transmittance characteristics shown in Figure 6A, the first light G and the second light R are reflected with a reflectance close to 100%, while the third light B is reflected with a reflectance close to 0%. Since losses such as absorption are negligible, the sum of transmittance and reflectance is approximately 100%. Therefore, a dichroic mirror having these reflectance-transmittance characteristics can transmit the third light B with a transmittance close to 100%.

[0097] In this disclosure, "reflecting light" means that the reflectance at the peak wavelength of the light is 50% or more. "Transmitting light" means that the reflectance at the peak wavelength of the light is less than 50%.

[0098] Figure 6A shows an example of reflectance-transmittance characteristics that transmit the third light B and reflect the first light G and the second light R, and the first region 51 can be formed by a dichroic mirror having such reflectance-transmittance characteristics. The reflectance of the first region 51 is preferably 80% or more, and more preferably 90% or more, at the peak wavelength of the first light G. The reflectance of the first region 51 is preferably less than 20%, and more preferably less than 10%, at the peak wavelength of the third light B.

[0099] Figure 6B shows an example of reflectance-transmittance characteristics that transmit the second light R and reflect the first light G and the third light B, and a second region 52 can be formed by a dichroic mirror having such reflectance-transmittance characteristics. The reflectance of the second region 52 is preferably 80% or more, and more preferably 90% or more, at the peak wavelength of the first light G. The reflectance of the second region 52 is preferably less than 20%, and more preferably less than 10%, at the peak wavelength of the second light R.

[0100] Figure 6C shows an example of reflectance-transmittance characteristics that transmit the first light G and the third light B and reflect the second light R, and a third region 53 can be formed by a dichroic mirror having such reflectance-transmittance characteristics. The reflectance of the third region 53 is preferably 80% or more, and more preferably 90% or more, at the peak wavelength of the second light R. The reflectance of the third region 53 is preferably less than 20%, and more preferably less than 10%, at the peak wavelength of the first light G. The reflectance of the third region 53 is preferably less than 20%, and more preferably less than 10%, at the peak wavelength of the third light B.

[0101] Figure 6D shows an example of reflectance-transmittance characteristics that transmit the first light G and the second light R and reflect the third light B, and a fourth region 54 can be formed by a dichroic mirror having such reflectance-transmittance characteristics. The reflectance of the fourth region 54 is preferably 80% or more, and more preferably 90% or more, at the peak wavelength of the third light B. The reflectance of the fourth region 54 is preferably less than 20%, and more preferably less than 10%, at the peak wavelength of the first light G. The reflectance of the fourth region 54 is preferably less than 20%, and more preferably less than 10%, at the peak wavelength of the second light R.

[0102] Figure 7 schematically shows how the first region 51, the second region 52, the third region 53, the fourth region 54, the reflective surface 56M, and the reflective surface 57M transmit or reflect the first light G, the second light R, and the third light B.

[0103] The optical paths of the first light G, the second light R, and the third light B are as follows:

[0104] The first light G enters the third region 53 of the optical control unit 50. The first light G passes through the third region 53 and is reflected by the first region 51. The first light G reflected by the first region 51 is then reflected by the second region 52. Between the time it is reflected by the first region 51 and the time it is reflected by the second region 52, the first light G passes through the third region 53. Between the time it is reflected by the first region 51 and the time it is reflected by the second region 52, the first light G passes through the fourth region 54. The first light G reflected by the second region 52 passes through the fourth region 54 and is emitted from the optical control unit 50.

[0105] The second light R is incident on the third region 53 of the optical control unit 50. The second light R is reflected by the third region 53. The second light R reflected by the third region 53 is reflected by the reflective surface 56M. Between the time it is reflected by the third region 53 and reflected by the reflective surface 56M, the second light R passes through the fourth region 54. Between the time it is reflected by the third region 53 and reflected by the reflective surface 56M, the second light R passes through the second region 52. The second light R reflected by the reflective surface 56M passes through the fourth region 54 and is emitted from the optical control unit 50. Between the time it is reflected by the reflective surface 56M and passed through the fourth region 54, the second light R passes through the second region 52.

[0106] The third light B enters the third region 53 of the optical control unit 50. The third light B passes through the third region 53 and is reflected by the reflective surface 57M. Between the time it passes through the third region 53 and is reflected by the reflective surface 57M, the third light B passes through the first region 51. The third light B reflected by the reflective surface 57M is reflected by the fourth region 54 and emitted from the optical control unit 50. Between the time it is reflected by the reflective surface 57M and is reflected by the fourth region 54, the third light B passes through the first region 51. Between the time it is reflected by the reflective surface 57M and is reflected by the fourth region 54, the third light B passes through the third region 53.

[0107] In the optical control unit 50, the first light G passes through the third region 53 twice. The first light G passes through the fourth region 54 twice. The second light R passes through the second region 52 twice. The second light R passes through the fourth region 54 twice. The third light B passes through the first region 51 twice. The third light B passes through the third region 53 twice.

[0108] The optical control in the first region 51, the second region 52, the third region 53, the fourth region 54, the reflective surface 56M, and the reflective surface 57M is as follows.

[0109] The first region 51 reflects the first light G. Here, the optical path length of the first light G at the position where the first light G is reflected by the first region 51 is defined as the first optical path length. The first region 51 transmits the third light B. Since the second light R does not substantially enter the first region 51, specific conditions for the reflectance and transmittance characteristics of the second light R in the first region 51 do not need to be specified.

[0110] The second region 52 reflects the first light G. Here, the optical path length of the first light G at the position where it is reflected by the second region 52 is defined as the second optical path length. The second region 52 reflects the first light G at a second optical path length which is longer than the first optical path length. The second region 52 transmits the second light R. Since the third light B does not substantially enter the second region 52, specific conditions for the reflectance and transmittance characteristics of the third light R in the second region 52 do not need to be specified.

[0111] The third region 53 reflects the second light R. The third region 53 transmits the first light G. The third region 53 transmits the first light G when the optical path length is shorter than the first optical path length. The third region 53 transmits the first light G when the optical path length is longer than the first optical path length. The third region 53 transmits the third light B.

[0112] The fourth region 54 reflects the third light B. The fourth region 54 transmits the first light G. The fourth region 54 transmits the first light G when the optical path length is longer than the first optical path length. The fourth region 54 transmits the first light G when the optical path length is shorter than the second optical path length. The fourth region 54 transmits the first light G when the optical path length is longer than the second optical path length. The fourth region 54 transmits the second light R.

[0113] The reflective surface 56M reflects the second light. Preferably, the reflectance of the reflective surface 56M is 80% or more, and more preferably 90% or more, at the peak wavelength of the second light R. The reflective surface 56M reflects the second light R reflected by the first optical member 55a. The reflective surface 56M reflects the second light R that has passed through the first optical member 55b. Since the first light G and the third light B do not substantially enter the reflective surface 56M, specific conditions for the reflectance and transmittance characteristics of the reflective surface 56M with respect to the first light G and the third light B do not need to be specified.

[0114] The reflective surface 57M reflects the third light. The reflectance of the reflective surface 57M is preferably 80% or more, and more preferably 90% or more, at the peak wavelength of the third light B. The reflective surface 57M reflects the third light B that has passed through the first optical member 55a. Since the first light G and the second light R are not substantially incident, specific conditions for the reflectance and transmittance characteristics of the reflective surface 57M with respect to the first light G and the second light R do not need to be specified.

[0115] According to the optical control unit 50 in the illustrated example of the light-emitting device 100, the first optical member 55a separates the optical paths of the first light G, the second light R, and the third light B. The light is separated into light reflected by the first surface of the first optical member 55a, light reflected by the second surface, and light transmitted through the first and second surfaces.

[0116] The separated first light G, second light R, and third light B are aligned coaxially when they are emitted from the first optical member 55b. The light reflected by the first surface of the first optical member 55b, the light reflected by the second surface, and the light transmitted through the first and second surfaces are aligned coaxially.

[0117] In the optical control unit 50, the optical control of the first light G is achieved by the first optical member 55. The second optical member 56 and the third optical member 57 do not need to be used for the optical control of the first light G. The optical control of the second light R is achieved by the first optical member 55 and the second optical member 56. The third optical member 57 does not need to be used for the optical control of the second light R. The optical control of the third light B is achieved by the first optical member 55 and the third optical member 57. The second optical member 56 does not need to be used for the optical control of the third light B.

[0118] An optical control unit 50 having such a configuration is implemented by adjusting and arranging the first optical member 55, the second optical member 56, and the third optical member 57 to appropriate positions. The arrangement of the first optical member 55, the second optical member 56, and the third optical member 57 can be achieved by first arranging the first optical members 55a and 55b, and then arranging the second optical member 56 and the third optical member 57.

[0119] As described above, the optical control of the first light G is achieved by the first optical member 55. First, the direction of emission of the first light G can be determined by adjusting the position and orientation of the first optical members 55a and 55b. Subsequently, the direction of emission of the second light R is determined by adjusting the position and orientation of the second optical member 56. Furthermore, the direction of emission of the third light B is determined by adjusting the position and orientation of the reflective surface 57M of the third optical member 57.

[0120] When light traveling along the optical axis of the first light G is emitted through the optical axis of the lens member 40 and incident on the optical control unit 50, the first optical members 55a and 55b can be arranged in parallel to determine the emission direction of the first light G. The position and orientation of the second optical member 56 are then adjusted so that the emission direction of the second light R aligns with the emission direction of the first light G, and the position and orientation of the third optical member 57 are then adjusted so that the emission direction of the third light B aligns with the emission direction of the first light G. In this way, the alignment of the three optical axes can be easily adjusted.

[0121] By providing a light-emitting unit that emits three beams of light whose optical axes are not parallel to each other, and then arranging an optical control unit 50 for the optical control described above, a light-emitting device that emits three beams of light whose optical axes are parallel to each other can be realized. Furthermore, by arranging multiple optical components as described above, an optical control unit 50 that emits three beams of light whose optical axes are parallel to each other can be realized.

[0122] The light-emitting unit can be prepared, for example, by going through the steps of arranging a package 10 equipped with a light-emitting element 20 and arranging a lens member 40. However, regarding the emission of three beams of light whose optical axes are not parallel to each other, the lens member 40 is not essential; for example, the light-emitting unit can also be prepared by arranging three light-emitting elements 20.

[0123] Specifically, the light-emitting device 100 is manufactured by a method that includes arranging a first light-emitting element 20 that emits a first light G, a second light-emitting element 20 that emits a second light R, and a third light-emitting element 20 that emits a third light B, and arranging a light control unit 50. At this time, the optical control unit 50 is arranged by first arranging a first optical member 55 which forms a first region 51 that reflects the first light G at a first optical path length and transmits the third light B, a second region 52 that reflects the first light G at a second optical path length which is longer than the first optical path length and transmits the second light R, a third region 53 that transmits the first light G and reflects the second light R, and a fourth region 54 that transmits the first light G and reflects the third light B. After arranging the first optical member 55, a second optical member 56 having a reflective surface 56M that reflects the second light R, and a third optical member 57 having a reflective surface 57M that reflects the third light B are arranged.

[0124] The distance and angle between the first region 51 and the third region 53 can be adjusted by the thickness and shape of the first optical member 55a. The distance and angle between the second region 52 and the fourth region 54 can be adjusted by the thickness and shape of the first optical member 55b. In this example, the first region 51 and the third region 53 are parallel, and the second region 52 and the fourth region 54 are parallel, but the configuration of the present invention is not limited to this example. Also, for simplicity, the refraction that occurs in the light transmitted through the first optical members 55a and 55b is not shown in Figure 3. When aligning the optical axes of the first light G, the second light R, and the third light B parallel and, if necessary, coaxial, it is desirable to take the effect of refraction into consideration.

[0125] Next, based on the illustrated example of the light-emitting device 100, the mechanism by which the two lights emitted from the two light-emitting elements 20 are controlled will be explained with reference to Figures 8 and 9. Figure 8 shows the mechanism for optical control of the first light G and the second light R, and Figure 9 shows the mechanism for optical control of the first light G and the third light B.

[0126] In Figure 8, for convenience, the first light G is referred to as the first light 5A, the second light R as the second light 5B, the first region 51 as the first region 1, the second region 52 as the second region 2, the third region 53 as the third region 3, and the reflective surface 56M of the second optical member 56 as the reflective surface M of the second optical member.

[0127] In Figure 9, for convenience, the first light G is referred to as the first light 5A, the third light B as the second light 5B, the first region 51 as the first region 1, the second region 52 as the second region 2, the fourth region 54 as the third region 3, and the reflective surface 57M of the third optical member 57 as the reflective surface M of the second optical member.

[0128] Regarding Figures 8 and 9, the optical paths of the first light 5A and the second light 5B, and the optical control in each optical control region can be understood from the previously explained "mechanism by which the first light G, the second light R, and the third light B are controlled," so redundant descriptions will be omitted here as appropriate. In other words, for the optical control mechanism based on Figure 8, the explanations regarding the third light B, the fourth region 54, and the reflective surface 57M of the third optical member 57 should be omitted from the above explanation. For the optical control mechanism based on Figure 9, the explanations regarding the second light R, the third region 53, and the reflective surface 56M of the second optical member 56 should be omitted from the above explanation. It is clear that this can be easily understood by a person with ordinary skill in the art relating to this specification.

[0129] Regardless of which optical control is shown in Figure 8 or Figure 9, the following can be said in common:

[0130] First light beams 5A and second light beams 5B, whose optical axes are not parallel to each other, enter the optical control unit 50 and become first light beams 5A and second light beams 5B whose optical axes are parallel to each other, and are emitted from the optical control unit 50. The optical control unit 50 includes a first optical member 55 that forms three optical control regions. It also includes a second optical member having a reflective surface M. The optical control unit 50 includes one or two first optical members that form a first region 1 that reflects the first light beam 5A at a first optical path length, a second region 2 that reflects the first light beam 5A at a second optical path length which is longer than the first optical path length, and a third region 3 that transmits the first light beam 5A and reflects the second light beam 5B.

[0131] Furthermore, in the method for manufacturing the light-emitting device 100, the light-emitting device 100 is manufactured by a method comprising arranging a first light-emitting element 20 that emits a first light 5A and a second light-emitting element 20 that emits a second light 5B, and arranging a light control unit 50. In this case, the arrangement of the light control unit 50 is such that a first optical member 55 is arranged which forms a first region 1 that reflects the first light 5A at a first optical path length, a second region 2 that reflects the first light 5A at a second optical path length which is longer than the first optical path length, and a third region 3 that transmits the first light 5A and reflects the second light 5B, and after arranging the first optical member 55, a second optical member having a reflective surface that reflects the second light 5B is arranged.

[0132] In this way, by arranging at least three regions and a reflective surface and giving each region different reflection and transmission characteristics, it becomes possible to coaxially align the optical axes of light with different orientations and wavelengths using a small unit.

[0133] <Second Embodiment> Next, a light-emitting device 200 according to the second embodiment will be described. Figures 10 to 13 are drawings illustrating an exemplary form of the light-emitting device 200. Figure 10 is a perspective view of the light-emitting device 200 according to this embodiment. Figure 11 is a perspective view of the light-emitting device 200 with the cap 16 of the package 10 removed. Figure 12 is a top view in the same state as Figure 11. Figure 13 is a cross-sectional view taken along the line XIII-XIII in Figure 10. Figure 14 is a schematic diagram showing the transmission and reflection of light by the reflective surface formed by the optical member in the light control unit 50.

[0134] The main difference between the light-emitting device 200 according to this embodiment and the light-emitting device 100 in the first embodiment lies in the configuration of the light control unit 50. Therefore, common components of both embodiments will not be described again here. Below, an example of the configuration of the light control unit 50 in the light-emitting device 200 will be described.

[0135] The manner of optical control by the optical control unit 50 in the light-emitting device 200 is the same as that of the optical control unit 50 in the light-emitting device 100. The optical control unit 50 can convert the first light G, the second light R, and the third light B, whose optical axes are not parallel to each other, into the first light G, the second light R, and the third light B, whose optical axes are parallel to each other, and emit them. In Figure 12, the optical axis of the first light G is shown with a solid line, the optical axis of the second light R is shown with a dashed line, and the optical axis of the third light B is shown with a dotted line.

[0136] The light control unit 50 of the light-emitting device 200 differs from the two first optical members 55a and 55b of the light-emitting device 100 mainly in the shape and arrangement of the two first optical members 55a and 55b.

[0137] The first optical members 55a and 55b of the light-emitting device 200 are hexahedrons having a parallelogram shape with a vertex angle that is not 90 degrees when viewed from above. The two first optical members 55a and 55b are arranged so that one of their four sides faces opposite each other. None of the first region 51, second region 52, third region 53, and fourth region 54 are formed on these two opposing sides.

[0138] In the illustrated example of the light-emitting device 200, the two first optical elements 55a and 55b are arranged so that their opposing sides are in contact with each other. This allows for a reduction in the size of the optical control unit 50. Furthermore, it is possible to further reduce the size of the light-emitting device 200 in the first direction or the 1D direction.

[0139] To prevent a refractive index difference from occurring at the interface formed by the surfaces that are in contact with each other, it is desirable that the refractive index of the first optical member 55a and the refractive index of the other first optical member 55b be equal or close in value. For example, it is preferable that the refractive index difference is less than 0.5. This makes optical control easier even when light passes through this interface.

[0140] Furthermore, the first optical member 55 does not necessarily have to be composed of two first optical members 55a and 55b. The first optical member 55 may be composed of a single hexahedron. Also, an optical member formed by joining two first optical members 55a and 55b can be considered as a single first optical member.

[0141] In a top view, the second region 52 and the fourth region 54 are not formed on a hypothetical straight line connecting the endpoint of the first region 51 that is closer to the fourth region 54 and the endpoint of the third region 53 that is closer to the second region 52. In the light-emitting device 100, the second region 52 and the fourth region 54 are formed on this hypothetical straight line.

[0142] In a top view, the first region 51 and the third region 53 are not formed on a hypothetical straight line connecting the endpoint of the second region 52 that is closer to the third region 53 and the endpoint of the fourth region 54 that is closer to the first region 51. In the light-emitting device 100, the first region 51 and the third region 53 are formed on this hypothetical straight line.

[0143] In a top view, a hypothetical straight line connecting any point in the third region 53 and any point in the fourth region 54 passes through the two first optical members 55a and 55b. In the light-emitting device 100, this hypothetical straight line does not pass through the two first optical members 55a and 55b.

[0144] In a top view, a hypothetical straight line connecting any point in the first region 51 and any point in the second region 52 does not pass through the third region 53 and the fourth region 54. In the light-emitting device 100, this hypothetical straight line passes through at least one of the third region 53 or the fourth region 54.

[0145] The optical paths of the first light G, the second light R, and the third light B differ from those of the light-emitting device 100 in the following respects.

[0146] Between the time the first light G is reflected from the first region 51 to the second region 52, it does not pass through the third region 53. Between the time the first light G is reflected from the first region 51 to the second region 52, it does not pass through the fourth region 54.

[0147] Between the time the second light R is reflected by the third region 53 and the time it is reflected by the reflective surface 56M, it does not pass through the fourth region 54. Between the time the second light R is reflected by the third region 53 and the time it is reflected by the reflective surface 56M, it does not pass through the second region 52.

[0148] Between the time the third light B is reflected by the reflective surface 57M and the time it is reflected by the fourth region 54, the third light B does not pass through the first region 51. Between the time the third light B is reflected by the reflective surface 57M and the time it is reflected by the fourth region 54, the third light B does not pass through the third region 53.

[0149] The first light G passes through the third region 53 once. The first light G passes through the fourth region 54 once. The second light R passes through the second region 52 once. The second light R passes through the fourth region 54 once. The third light B passes through the first region 51 once. The third light B passes through the third region 53 once.

[0150] Thus, compared to the light-emitting device 100, the number of times each light passes through the light control region is reduced. This makes it possible to reduce light loss in the light control unit 50.

[0151] The optical control in the first region 51, the second region 52, the third region 53, the fourth region 54, the reflective surface 56M, and the reflective surface 57M differs from that of the light-emitting device 100 in the following respects.

[0152] In the third region 53, the first light G is not transmitted when the optical path length is longer than the first optical path length. In the fourth region 54, the first light G is not transmitted when the optical path length is shorter than the second optical path length.

[0153] Figures 15 and 16 are similar to Figures 8 and 9 in the light-emitting device 100. Figure 15 shows the mechanism for optical control of the first light G and the second light R, and Figure 16 shows the mechanism for optical control of the first light G and the third light B.

[0154] In Figure 15, for convenience, the first light G is referred to as the first light 5A, the second light R as the second light 5B, the first region 51 as the first region 1, the second region 52 as the second region 2, the third region 53 as the third region 3, and the reflective surface 56M of the second optical member 56 as the reflective surface M of the second optical member.

[0155] In Figure 15, a surface 5X corresponding to the fourth region 54 in the illustrated example of the light-emitting device 200 is shown, and the first light 5A and the second light 5B emitted from surface 5X are parallel. However, the optical axes of the first light 5A and the second light 5B can also be made parallel when they are emitted from the second region 2 before reaching surface 5X, so surface 5X is not essential.

[0156] In Figure 16, for convenience, the first light G is referred to as the first light 5A, the third light B as the second light 5B, the first region 51 as the first region 1, the second region 52 as the second region 2, the fourth region 54 as the third region 3, and the reflective surface 57M of the third optical member 57 as the reflective surface M of the second optical member.

[0157] In Figure 16, the surface 5X corresponding to the third region 53 in the illustrated example of the light-emitting device 200 is shown, but since this is before the first light 5A and the second light 5B separate, surface 5X is not essential.

[0158] Regarding Figures 15 and 16, the optical paths of the first light 5A and the second light 5B, and the optical control in each optical control region can be understood from the previously explained "mechanism by which the first light G, the second light R, and the third light B are controlled," so redundant descriptions will be omitted here as appropriate.

[0159] The same points that were common to both the optical control methods in Figures 8 and 9 also apply to Figures 15 and 16.

[0160] <Modified examples of embodiments> Figure 17 is a top view of a modified example of the light-emitting device 100 according to the first embodiment, with the package cap removed.

[0161] The differences between the light-emitting device 100 shown in Figure 17 and the light-emitting device 100 according to the first embodiment shown in Figure 3 lie in the arrangement of the light-emitting elements 20 inside the package 10 and the configuration of the light control unit 50.

[0162] In the example shown in Figure 17, the first light G, the second light R, and the third light B are each transmitted through the lens member 40, collimated, and then incident on the fourth region 54 of the first optical member 55a in the optical control unit 50. As described in the first embodiment, the fourth region 54 transmits the first light G and the second light R and reflects the third light B. In the first embodiment, the fourth region 54 is the region into which the first light G is incident with an optical path length longer than the second optical path length, and the first light G, the second light R, and the third light B are emitted from this fourth region 54. In contrast, in the example shown in Figure 17, the fourth region 54 is the region into which the first light G is incident with an optical path length shorter than the first optical path length, and the first light G, the second light R, and the third light B are incident on this fourth region 54.

[0163] On the other hand, in the example shown in Figure 17, the third region 53 transmits the first light G and the third light B, and reflects the second light R. The third region 53 is the region into which the first light G is incident with a path length longer than the second optical path length, and the first light G, the second light R, and the third light B are emitted from this third region 53.

[0164] Thus, the third region 53 and the fourth region 54 can be arranged to function as one of the light incident surface and the light exit surface of the optical control unit 50, respectively. In the example of Figure 17, the positions of the second optical member 56 and the third optical member 57 are reversed compared to the first embodiment. The reflective surface 56M of the second optical member 56 and the reflective surface 57M of the third optical member 57 do not need to have wavelength selectivity, so it is not necessarily required to reverse their positions according to the wavelength of the incident light.

[0165] Thus, the configuration shown in Figure 17 can achieve the same effects as the light-emitting device 100 according to the first embodiment.

[0166] Figure 18 is a top view of a modified example of the light-emitting device according to the second embodiment, with the package cap removed.

[0167] The differences between the light-emitting device 200 shown in Figure 18 and the light-emitting device 200 according to the second embodiment shown in Figure 12 lie in the arrangement of the light-emitting elements 20 inside the package 10 and the configuration of the light control unit 50.

[0168] In the example shown in Figure 18, the first light G, the second light R, and the third light B are each transmitted through the lens member 40, collimated, and then incident on the fourth region 54 of the first optical member 55a in the optical control unit 50. The fourth region 54 transmits the first light G and the second light R, and reflects the third light B.

[0169] On the other hand, the third region 53 transmits the first light G and the third light B, and reflects the second light R. The third region 53 is the region into which the first light G is incident with a path length longer than the second optical path length, and the first light G, the second light R, and the third light B are emitted from the third region 53.

[0170] Thus, the configuration example shown in Figure 18 can achieve the same effects as the light-emitting device 200 according to the second embodiment.

[0171] According to the above embodiments and their modifications, it becomes possible to emit light that is incident on the optical control unit 50 with its optical axis not parallel to the optical incident surface (for example, one of the third region 53 and the fourth region 54) from the optical output surface (for example, the other of the third region 53 and the fourth region 54) with its optical axis parallel to the other. Furthermore, the spacing between the optical axes of the light incident on the optical incident surface can be reduced when the light is emitted from the optical output surface.

[0172] FIG. 19A is a diagram schematically showing the positions of the optical axes of the respective lights incident on the light incident surface of the optical control unit 50. More specifically, FIG. 19A shows a region (one of the third region 53 and the fourth region 54) where the first light G is incident with an optical path length shorter than the first optical path length, and the lights passing through the optical axes of the first light G, the second light R, and the third light B respectively. It is a diagram schematically showing the points projected onto a virtual plane V1 perpendicular to the second direction (2D). Here, the distance between the two farthest points on this virtual plane V1 is taken as the first distance (d IN ).

[0173] FIG. 19B is a diagram schematically showing the positions of the optical axes of the respective lights emitted from the light emission surface of the optical control unit 50. More specifically, FIG. 19B shows a region (the other of the third region 53 and the fourth region 54) where the first light G is incident with an optical path length longer than the second optical path length, and the lights passing through the optical axes of the first light G, the second light R, and the third light B respectively. It is a diagram schematically showing the points projected onto another virtual plane V2 perpendicular to the second direction (2D). Here, the distance between the two farthest points on this virtual plane V2 is taken as the second distance (d OUT ).

[0174] According to the embodiments and modifications of the present disclosure, the second distance (d IN ) can be made smaller than the first distance (d OUT ). When the first distance (d IN ) is, for example, in the range of 50 μm or more and 1000 μm or less, the second distance (d OUT ) can be in the range of 0 μm or more and 100 μm or less. The second distance (d OUTWhen the distance between the first, second, and third rays is within the range of 100 μm or less, the first, second, and third rays can be said to be "coaxial". The "main part" of the first, second, and third rays collimated by the lens member 40 may have roughly the shape of an ellipse or a circle on the virtual plane V1 or V2. If the shape of the main part of the first, second, and third rays on the virtual plane V1 or V2 is an ellipse, the major axis of each ellipse may be in the range of 500 μm to 5000 μm, for example, and the minor axis may be in the range of 200 μm to 2000 μm. The degree of overlap of the main parts of the first, second, and third rays on the virtual plane V2 is greater than the degree of overlap of the main parts of the first, second, and third rays on the virtual plane V1.

[0175] Figure 20 is a schematic side view showing an example configuration of a head-mounted display 300 equipped with a light-emitting device 100 (200) according to an embodiment of the present disclosure. This head-mounted display 300 includes temples 250 and a waveguide 260 connected to the temples 250. The waveguide 260 has a light-emitting region, such as a diffraction grating. Laser light incident on the waveguide 260 can be emitted from the light-emitting region of the waveguide 260 toward the retina of the user's eye.

[0176] One end of the temple 250 is located on the waveguide 260 side, in other words, on the user's face side, and the other end of the temple 250 is located on the opposite side of the waveguide 260, in other words, on the user's ear side. In Figure 20, the direction of both ends of the temple 250 is referred to as the 2D direction, and the direction perpendicular to it is referred to as the 1D direction. Based on a user wearing the head-mounted display 300, the 1D direction is the direction from the user's chin to their head (or vice versa), and the 2D direction is the direction from the user's ear to their eye (or vice versa).

[0177] In the example of the head-mounted display 300 shown in Figure 20, the light-emitting device 100(200) is supported inside the temple 250. In Figure 20, the light-emitting device 100(200) is depicted as being visible from the side, but in reality, the appearance of the light-emitting device 100(200) is not visible from the outside. The size of the light-emitting device 100(200) in the first direction or 1D direction is, for example, between 3 mm and 15 mm, which is smaller than the size of the temple 250 in the 1D direction.

[0178] It is preferable that the light-emitting device 100(200) is mounted on the head-mounted display 300 such that the first direction or 1D direction of the light-emitting device 100(200) is the same as the 1D direction of the head-mounted display 300, and the second direction or 2D direction of the light-emitting device 100(200) is the same as the 2D direction of the head-mounted display 300. By miniaturizing the light-emitting device 100(200) in the 1D direction, the size of the temple 250 in the 1D direction can be reduced. Furthermore, as shown in the figure, the length of the temple 250 in the 2D direction is such that it is necessary to ensure the distance from the user's eyes to their ears, so it is presumed that if the size of the light-emitting device 100(200) in the 2D direction is small enough, any further reduction will not contribute to miniaturization of the head-mounted display 300 in the 2D direction.

[0179] In this embodiment, the light-emitting device 100(200) emits collimated beams of a first light, a second light, and a third light coaxially in the second direction (2D). The first light, the second light, and the third light are laser beams of one of the following colors: red, green, and blue, respectively. Each colored laser beam is scanned by a MEMS element, such as a micromirror, travels through the waveguide 260, and eventually forms an image on the user's retina. The display of the color image may be performed in a field sequential manner. In that case, the first light, the second light, and the third light are emitted sequentially. To monitor the intensity of the first light, the second light, and the third light, a photodetector such as a photodiode may be used for each light. The photodetector may be located outside or inside the light-emitting device 100(200). Alternatively, the photodetector may be located inside the package 10 of the light-emitting device 100(200).

[0180] Furthermore, in the case of a method that forms an image on the retina, it is preferable to make the focal spot of the beam on the retina as small as possible in order to achieve high resolution. From this viewpoint, a longer focal length is preferable. On the other hand, if the focal length is increased, the amount of light that does not enter the lens surface of the lens member 40 may increase, which can lead to increased light loss. In particular, with laser light, the spread of light is greater in the fast axis direction than in the slow axis direction, so the fast axis direction is more susceptible to the effects of loss.

[0181] Furthermore, in near-field patterns, the shape of the laser beam is larger in the slow axis direction of the FFP than in the fast axis direction. Therefore, when collimating with lenses that have the same focal length in both the slow and fast axes, the focused spot on the retina becomes larger in the slow axis direction.

[0182] Therefore, it is preferable to design the lens surface of the lens member 40 such that the focal length in the slow axis direction is longer than the focal length in the fast axis direction. This makes it possible to reduce the size of the focused spot in the slow axis direction without increasing the loss of laser light.

[0183] While embodiments of the present invention have been described above, the light-emitting device according to the present invention is not strictly limited to the light-emitting devices of the embodiments. In other words, the present invention is not limited to the external form and structure of the light-emitting device disclosed in the embodiments. For example, it may be a light-emitting device without protective elements. Furthermore, it can be applied without requiring all components to be provided in sufficient quantities. For example, if some of the components of the light-emitting device disclosed in the embodiments are not described in the claims, a degree of design freedom for those skilled in the art is permitted for those components, such as substitution, omission, modification of shape, or change of material, and the invention described in the claims is then specified to be applicable. [Industrial applicability]

[0184] Each embodiment of the light-emitting device can be used in head-mounted displays, projectors, lighting, displays, and the like. [Explanation of Symbols]

[0185] 1 1st area 2 Second area 3 Third area 10 packages 10A light extraction surface 11 Base 11M mounting surface 11P Peripheral area 12 Side wall section 13 Translucent area 14 Wiring area 15. Circuit board (first circuit board) 16 caps 17 Metal layer 20 Light-emitting elements 30 Submount 40 Lens components 50 Light control units 51 First area 52 Second area 53 Third area 54 4th area 55 First Optical Component 55a First optical component 55b First optical component 56 Second Optical Component 57 Third Optical Component 60A protection element 60B Temperature measuring element 70 Wiring 90 board (second board) 100 Light-emitting device (first embodiment) 200 Light-emitting device (second embodiment) 300 head-mounted displays

Claims

1. A first light-emitting element that emits first light having a first peak wavelength, A second light-emitting element that emits a second light having a second peak wavelength different from the first peak wavelength, A light control unit into which the first and second beams, whose optical axes are not parallel to each other, are incident, and which emits the first and second beams, whose optical axes are parallel to each other, Equipped with, The aforementioned optical control unit is One or two first optical members that form a first region that reflects the first light at a first optical path length, a second region that reflects the first light at a second optical path length which is longer than the first optical path length, and a third region that transmits the first light and reflects the second light. A second optical member having a reflective surface that reflects the second light, A light-emitting device equipped with the following features.

2. The light-emitting device according to claim 1, wherein the reflective surface of the second optical member reflects the second light that has been transmitted through the first optical member 1 or 2, or that has been reflected by the first optical member 1 or 2.

3. The third region transmits the first light in an optical path length shorter than the first optical path length. The light-emitting device according to claim 1 or 2, wherein the second region reflects the first light and transmits the second light.

4. The reflective surface of the second optical member reflects the second light reflected in the third region, The light-emitting device according to claim 3, wherein the second light passes through the second region twice.

5. The reflective surface of the second optical member reflects the second light reflected in the third region, The light-emitting device according to claim 3, wherein the second light passes through the second region once.

6. The third region transmits the first light in an optical path length longer than the second optical path length. The light-emitting device according to claim 1 or 2, wherein the first region reflects the first light and transmits the second light.

7. The third region reflects the second light reflected at the reflective surface of the second optical member, The light-emitting device according to claim 6, wherein the second light passes through the first region twice.

8. The third region reflects the second light reflected at the reflective surface of the second optical member, The light-emitting device according to claim 6, wherein the second light passes through the first region once.

9. The third light-emitting element further comprises a third light-emitting element having a third peak wavelength different from the first and second peak wavelengths, The aforementioned optical control unit is The third optical member further comprises a reflective surface that reflects the third light, The first optical member 1 or 2 further forms a fourth region that transmits the first and second light and reflects the third light. A light-emitting device according to any one of claims 1 to 8, wherein the first light, the second light, and the third light, whose optical axes are not parallel to each other, are incident upon the device, and the first light, the second light, and the third light, whose optical axes are parallel to each other, are emitted.

10. Having two of the first optical members, The first region and the second region are provided in two different first optical members. The light-emitting device according to claim 9, wherein the third and fourth regions are provided on different first optical members in the two first optical members.

11. The light-emitting device according to claim 9 or 10, wherein the first optical member 1 or 2 is arranged between a plane including the reflective surface of the second optical member and a plane including the reflective surface of the third optical member.

12. The light-emitting device according to any one of claims 9 to 11, wherein the number of times the third light passes through the first region is the same as the number of times the second light passes through the second region.

13. The light-emitting device according to any one of claims 9 to 12, wherein the first light, the second light, and the third light are each different colors of light selected from red light, green light, and blue light.

14. The light-emitting device according to any one of claims 9 to 13, wherein the first light-emitting element, the second light-emitting element, and the third light-emitting element are semiconductor laser elements.

15. The first light, the second light, and the third light are incident on the third or fourth region, in which the first light is incident with an optical path length shorter than the first optical path length. The first light, the second light, and the third light are emitted from the third or fourth region, from the region in which the first light is incident with an optical path length longer than the second optical path length. The light-emitting device according to any one of claims 9 to 14, wherein, with respect to the points where light passing through the respective optical axes of the first, second, and third light is incident on a region in which the first light is incident with an optical path length shorter than the first optical path length, the distance between the two furthest points is defined as the first distance, and with respect to the points where light passing through the respective optical axes of the first, second, and third light is incident on a region in which the first light is incident with an optical path length longer than the second optical path length, the distance between the two furthest points is defined as the second distance is shorter than the first distance.

16. The invention further comprises a lens member having a single lens surface that collimates a first light emitted from the first light-emitting element, a second light emitted from the second light-emitting element, and a third light emitted from the third light-emitting element. The light-emitting device according to any one of claims 9 to 15, wherein the first light, the second light, and the third light that have passed through one lens surface of the lens member are incident on the light control unit.

17. A method for manufacturing a light-emitting device, The arrangement includes a first light-emitting element that emits first light having a first peak wavelength, and a second light-emitting element that emits second light having a second peak wavelength different from the first peak wavelength. An optical control unit is arranged to receive the first and second beams of light whose optical axes are not parallel to each other, and to emit the first and second beams of light whose optical axes are parallel to each other. It has, The arrangement of the aforementioned optical control unit is as follows: One or two first optical members are arranged to form a first region that reflects the first light at a first optical path length, a second region that reflects the first light at a second optical path length which is longer than the first optical path length, and a third region that transmits the first light and reflects the second light. After arranging the first optical member, a second optical member having a reflective surface that reflects the second light is arranged. A manufacturing method having the following characteristics.

Images