Light-emitting devices, light-emitting modules, and vehicles

Abstract

The present invention provides a light-emitting device, a light-emitting module, and a vehicle, each having multiple light-emitting units with different peak wavelengths. [Solution] A light-emitting device for a vehicle's rear lamp, comprising a substrate, a plurality of light-emitting elements constituting a first light-emitting section, a second light-emitting section, and a third light-emitting section, and a light-shielding member separating the plurality of light-emitting sections, wherein the first light-emitting section is JIS In the XYZ color system defined in Z8781-3:2016, the chromaticity coordinate x has a range of 0.310≦x≦0.500, and the chromaticity coordinate y has a range of y≦0.150+0.640x, y≧0.050+0.750x, and 0.382≦y≦0.440, and emits light with a brightness of 250lm or more at a driving voltage of 13.5V. The second light-emitting unit has a chromaticity of 0.398≦y≦0.429 and z≦0.007, and emits light with a brightness of 150lm or more. The third light-emitting unit has y≦0.335 and z≦0.008, and emits light with a brightness of 180lm or more.

Description

[Technical Field]

[0001] This disclosure relates to light-emitting devices, light-emitting modules, and vehicles. [Background technology]

[0002] Patent Document 1 discloses an optoelectronic semiconductor chip comprising a semiconductor layer array having a plurality of segments arranged adjacent to each other in the horizontal direction, a first conversion member and a second conversion member each mounted on the main radiating surface of the plurality of segments, and a seal provided between the first conversion member and the second conversion member. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Special Publication No. 2015-512559 [Overview of the project] [Problems that the invention aims to solve]

[0004] This disclosure aims to provide a light-emitting device, a light-emitting module, and a vehicle having multiple light-emitting units, each with a different emission peak wavelength. [Means for solving the problem]

[0005] A light-emitting device according to one embodiment of the present disclosure is a light-emitting device for a vehicle's rear lamp, comprising a substrate, a plurality of light-emitting elements disposed on the substrate which constitute a first light-emitting section, a second light-emitting section, and a third light-emitting section, and a light-shielding member that, in a top view, separates the first light-emitting section, the second light-emitting section, and the third light-emitting section, wherein the first light-emitting section has a chromaticity such that, in the XYZ color system defined in JIS Z8781-3:2016, the range of the chromaticity coordinate x is 0.310≦x≦0.500, the range of the chromaticity coordinate y is y≦0.150+0.640x, y≧0.050+0.750x, and 0.382≦y≦0.440, and emits light having a brightness of 250lm or more at a driving voltage of 13.5V, and the second light-emitting section is JIS In the XYZ color system defined in Z8781-3:2016, the third light-emitting unit emits light having a chromaticity where the range of the chromaticity coordinate y is 0.398 ≤ y ≤ 0.429 and the range of the chromaticity coordinate z is z ≤ 0.007, and has a brightness of 150 lm or more at a driving voltage of 13.5 V. The third light-emitting unit emits light having a chromaticity where the range of the chromaticity coordinate y is y ≤ 0.335 and the range of the chromaticity coordinate z is z ≤ 0.008 in the XYZ color system defined in JIS Z8781-3:2016, and has a brightness of 180 lm or more at a driving voltage of 13.5 V.

[0006] A light-emitting module according to one embodiment of the present disclosure comprises a light-emitting device and a lens disposed above the light-emitting device, wherein the position in the height direction of the upper surface of the first light-emitting portion differs from the position in the height direction of the upper surface of the third light-emitting portion, and the position in the height direction of the focal point of light emitted from the light-emitting element constituting the first light-emitting portion and passing through the lens is different from the position in the height direction of the focal point of light emitted from the light-emitting element constituting the third light-emitting portion and passing through the lens.

[0007] A vehicle according to one embodiment of the present disclosure is a vehicle equipped with the light-emitting device, wherein when the vehicle is moving backward, the first light-emitting unit irradiates light onto the road surface, and at least one of the second light-emitting unit and the third light-emitting unit irradiates the road surface with a first light pattern having the same width as the width of the vehicle.

[0008] A vehicle according to one embodiment of the present disclosure is a vehicle equipped with the light-emitting device, wherein when the vehicle is moving backward, the first light-emitting unit irradiates light onto the road surface, and at least one of the second light-emitting unit and the third light-emitting unit irradiates a second light pattern on the road surface to indicate the presence of an obstacle, in response to a control signal from a control unit that has detected an obstacle on the road surface. [Effects of the Invention]

[0009] According to one embodiment of the present disclosure, it is possible to provide a light-emitting device, a light-emitting module, and a vehicle having a plurality of light-emitting units, each with a different emission peak wavelength. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic rear view showing the rear of a vehicle equipped with a light-emitting device according to the embodiment. [Figure 2] This is a schematic perspective view showing the light-emitting device according to the embodiment. [Figure 3] This is a schematic top view showing a light-emitting device according to an embodiment. [Figure 4] Figure 3 is a schematic cross-sectional view showing the cross-section of the light-emitting device cut along the line IV-IV. [Figure 5] Figure 3 is a schematic cross-sectional view showing the cross-section of the light-emitting device cut along the VV line. [Figure 6] This is a schematic top view showing a light-emitting device according to a modified example of the embodiment 1. [Figure 7] Figure 6 shows a schematic cross-sectional view of the light-emitting device cut along the line VII-VII. [Figure 8] Figure 6 shows a schematic cross-sectional view of the light-emitting device cut along the line VIII-VIII. [Figure 9] This is a schematic cross-sectional view showing a cross-section of the light-emitting device according to modified example 2. [Figure 10] This is a schematic cross-sectional view showing a cross-section of the light-emitting module according to the embodiment. [Figure 11] This is a block diagram showing an example of the configuration of the control unit of a vehicle according to the embodiment. [Figure 12] It is a schematic diagram showing a first example of a vehicle according to an embodiment. [Figure 13] It is a schematic diagram showing a second example of a vehicle according to an embodiment. [Figure 14] It is a schematic diagram showing a third example of a vehicle according to an embodiment.

Mode for Carrying Out the Invention

[0011] Hereinafter, referring to the drawings, a light-emitting device, a light-emitting module, and a vehicle according to embodiments of the present disclosure will be described in detail. However, the embodiments shown below are examples of a light-emitting device, a light-emitting module, and a vehicle for embodying the technical idea of the embodiment, and are not limited thereto. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present disclosure only thereto without specific description, but are merely illustrative examples. Note that the sizes, positional relationships, etc. of the members shown in each drawing may be exaggerated for clarity of explanation. Also, in the following description, the same names and reference numerals indicate the same or similar members, and detailed descriptions will be omitted as appropriate. In some cases, an end view showing only the cut surface is used as a cross-sectional view.

[0012] In the following diagrams, directions may be indicated by the X, Y, and Z axes. The X, Y, and Z axes are mutually orthogonal. In this specification, the X-axis direction is referred to as the "first direction X". The Y-axis direction is referred to as the "second direction Y". The Z-axis direction corresponds to the "height direction" of the light-emitting device 10. In the first direction X, the direction the arrow is pointing is referred to as the +X direction or +X side, and the opposite direction of the +X direction is referred to as the -X direction or -X side. In the second direction Y, the direction the arrow is pointing is referred to as the +Y direction or +Y side, and the opposite direction of the +Y direction is referred to as the -Y direction or -Y side. In the Z-axis direction, the direction the arrow is pointing is referred to as the +Z direction or +Z side, and the opposite direction of the +Z direction is referred to as the -Z direction or -Z side. In the terminology of the embodiments, "top view" means viewing the object from the +Z direction or +Z side. In this specification, in addition to parts that can be directly seen from above, parts that cannot be directly seen from above may also be described as being visible through the light source using the term "top view." However, these do not restrict the orientation of the light source when it is used, and the orientation of the light source is arbitrary. In the embodiments, the surface of the object viewed from above, in the +Z direction, or from the +Z side is defined as the "top surface," and the surface of the object viewed from below, in the -Z direction, or from the -Z side is defined as the "bottom surface." In the embodiments described below, being along the X, Y, and Z axes includes the object having an inclination within ±10° of these axes. In the embodiments, orthogonality may include an error of ±10° or less of 90°.

[0013] Furthermore, unless otherwise specified in this disclosure, the term "polygon" may refer to shapes that have been processed, such as rectangles, with rounded corners, chamfers, or other modifications applied to their edges. Similarly, shapes with processing applied not only to the corners (ends of the sides) but also to the middle parts of the sides may also be referred to as polygons. In other words, shapes that retain a polygonal base but have undergone partial processing are included in the interpretation of "polygon" as described in this disclosure.

[0014] Furthermore, the same applies to terms describing specific shapes, not just polygons, but also trapezoids, circles, and other shapes with concave or convex forms. The same also applies to terms relating to each side that forms such a shape. In other words, even if a side has been modified at a corner or in the middle, the interpretation of "side" includes the modified portion.

[0015] Furthermore, "to cover" or "to enclose" is not limited to direct contact, but also includes indirect covering, for example, through other components. Similarly, "to arrange" is not limited to direct contact, but also includes indirect arrangement, for example, through other components.

[0016] [Embodiment] <Light-emitting device 10> An example of the configuration of the light-emitting device 10 according to the embodiment will be described with reference to Figures 1 to 5. Figure 1 is a schematic rear view showing the rear of a vehicle 1 equipped with the light-emitting device 10 according to the embodiment. Figure 2 is a schematic perspective view showing the light-emitting device 10 according to the embodiment. Figure 3 is a schematic top view showing the light-emitting device 10 according to the embodiment. Figure 4 is a schematic cross-sectional view showing the cross-section of the light-emitting device 10 cut along the line IV-IV shown in Figure 3. Figure 5 is a schematic cross-sectional view showing the cross-section of the light-emitting device 10 cut along the line VV shown in Figure 3. Note that in Figure 2, a part of the covering member 70 of the light-emitting device 10 is omitted. Also, in Figures 3 to 5, all of the covering member 70 and wires 80 etc. of the light-emitting device 10 are omitted.

[0017] As shown in Figure 1, the light-emitting device 10 is a light-emitting device for the rear lamps of vehicle 1. The light-emitting device 10 functions as multiple types of lamps, such as backup lamps, rear turn signals, taillights, and brake lights. However, the light-emitting device 10 may also function as other types of lamps. In the example shown in Figure 1, vehicle 1 is equipped with one light-emitting device 10 on each of the left and right ends located on the rear of vehicle 1. Each light-emitting device 10 has a rectangular outer shape that extends in the width direction of vehicle 1 (in the direction along the first direction X). However, the outer shape of the light-emitting device 10 may be other shapes such as a square.

[0018] As shown in Figures 1 and 2, the light-emitting device 10 includes a substrate 20, a plurality of light-emitting elements 30, and a light-shielding member 40. The light-emitting device 10 may also further include other components such as a first light-transmitting member 51, a second light-transmitting member 52, a third light-transmitting member 53, a package substrate 60, and a covering member 70.

[0019] As shown in Figure 3, the multiple light-emitting elements 30 include multiple first light-emitting elements 31, multiple second light-emitting elements 32, and multiple third light-emitting elements 33. The first light-emitting elements 31, the second light-emitting elements 32, and the third light-emitting elements 33 are semiconductor light-emitting elements such as LEDs (Light Emitting Diodes) and LDs (Laser Diodes). The emission peak wavelengths of the light emitted from the first light-emitting element 31, the second light-emitting elements 32, and the third light-emitting elements 33 may be the same or different. When describing the first light-emitting elements 31, the second light-emitting elements 32, and the third light-emitting elements 33 without distinction, they are collectively referred to as "light-emitting elements 30".

[0020] The first light-transmitting member 51 may contain a first phosphor. The first phosphor is excited by light emitted from the first light-emitting element 31 and converts some of the wavelengths of the light emitted from multiple first light-emitting elements 31. The second light-transmitting member 52 may contain a second phosphor. The second phosphor is excited by light emitted from the second light-emitting element 32 and converts some of the wavelengths of the light emitted from multiple second light-emitting elements 32. The third light-transmitting member 53 may contain a third phosphor. The third phosphor is excited by light emitted from the third light-emitting element 33 and converts some of the wavelengths of the light emitted from multiple third light-emitting elements 33. However, the first light-transmitting member 51, the second light-transmitting member 52, and the third light-transmitting member 53 may not contain phosphors in some of their components, or not all of their components may contain phosphors.

[0021] The package substrate 60 supports the substrate 20. In the example shown in Figure 2, the top wiring 61 of the package substrate 60 is electrically connected to the top wiring 22 of the substrate 20 via a conductive wire 80. The top wiring 22 of the substrate 20 is electrically connected to the light-emitting element 30. The covering member 70 covers the wire 80. The package substrate 60 may have bottom wiring on its bottom side. The bottom wiring of the package substrate 60 is electrically connected to an external power supply.

[0022] The light-emitting device 10 has a first light-emitting section 11, a second light-emitting section 12, and a third light-emitting section 13. In the example shown in Figures 1 to 5, the first light-emitting section 11 comprises a plurality of first light-emitting elements 31 and a first light-transmitting member 51. The second light-emitting section 12 comprises a plurality of second light-emitting elements 32 and a second light-transmitting member 52. The third light-emitting section 13 comprises a plurality of third light-emitting elements 33 and a third light-transmitting member 53.

[0023] The first light-emitting unit 11 functions, for example, as a taillight for vehicle 1. The first light-emitting unit 11 irradiates, for example, mixed light of light emitted from the first light-emitting element 31 and light emitted from the first phosphor excited by the light from the first light-emitting element 31. The first light-emitting unit 11 irradiates light having a chromaticity such that, in the XYZ color system specified in Japanese Industrial Standard (hereinafter referred to as "JIS") Z8781-3:2016, the range of the chromaticity coordinate x is 0.310 ≤ x ≤ 0.500, and the range of the chromaticity coordinate y is y ≤ 0.150 + 0.640x, y ≥ 0.050 + 0.750x, and 0.382 ≤ y ≤ 0.440. The first light-emitting unit 11 irradiates, for example, white light, as light that satisfies these conditions regarding chromaticity. Furthermore, the first light-emitting unit 11 emits light having a brightness of 250 lm or more at a driving voltage of 13.5 V supplied to the first light-emitting element 31 from an external power source. However, the first light-emitting unit 11 does not necessarily have to include the first light-transmitting member 51, as long as it is configured to emit light that satisfies the above-mentioned chromaticity and brightness conditions.

[0024] The second light-emitting unit 12 functions, for example, as a rear turn signal lamp for vehicle 1. The second light-emitting unit 12 emits, for example, mixed light of light emitted from the second light-emitting element 32 and light emitted from the second phosphor excited by the light from the second light-emitting element 32. The second light-emitting unit 12 emits light having a chromaticity such that, in the XYZ color system specified in JIS Z8781-3:2016, the range of the chromaticity coordinate y is 0.398 ≤ y ≤ 0.429 and the range of the chromaticity coordinate z is z ≤ 0.007. The second light-emitting unit 12 emits, for example, orange light (amber light) as light that satisfies these chromaticity conditions. The second light-emitting unit 12 also emits light having a brightness of 150 lm or more at a driving voltage of 13.5 V supplied to the second light-emitting element 32 from an external power supply. However, the second light-emitting unit 12 does not necessarily have to include the second light-transmitting member 52, as long as it is configured to emit light that satisfies the above-mentioned chromaticity and brightness conditions.

[0025] When the light-emitting device 10 is attached to the vehicle 1, it is preferable that the second light-emitting section 12 extends in the first direction X, which is the width direction of the vehicle 1. By extending the second light-emitting section 12 in the width direction (first direction X) of the vehicle 1, the illumination range of the light from the second light-emitting section 12 becomes longer along the first direction X. As a result, the illumination of the second light-emitting section 12 makes it clear that the vehicle 1 is turning right or left.

[0026] The third light-emitting unit 13 functions, for example, as a tail lamp and brake lamp of vehicle 1. The third light-emitting unit 13 irradiates, for example, mixed light of light emitted from the third light-emitting element 33 and light emitted from the third phosphor excited by the light from the third light-emitting element 33. The third light-emitting unit 13 irradiates light having a chromaticity such that, in the XYZ color system specified in JIS Z8781-3:2016, the range of the chromaticity coordinate y is y ≤ 0.335 and the range of the chromaticity coordinate z is z ≤ 0.008. The third light-emitting unit 13 irradiates, for example, red light as light that satisfies these chromaticity conditions. The third light-emitting unit 13 also irradiates light having a brightness of 180 lm or more at a driving voltage of 13.5 V supplied to the third light-emitting element 33 from an external power supply. However, the third light-emitting unit 13 does not necessarily have to include the third light-transmitting member 53, as long as it is configured to emit light that satisfies the above-mentioned chromaticity and brightness conditions.

[0027] It is preferable that the number of third light-emitting elements 33 in the third light-emitting unit 13 is greater than the number of first light-emitting elements 31 in the first light-emitting unit 11 and the number of second light-emitting elements 32 in the second light-emitting unit 12. The red light emitted by the third light-emitting unit 13 is a color with low luminous efficiency (standard relative luminous efficiency). Therefore, having more third light-emitting elements 33 than the number of first light-emitting elements 31 and second light-emitting elements 32 increases the illuminance of the light emitted by the third light-emitting unit 13. This improves the visibility of the red light emitted by the third light-emitting unit 13. As a result, it becomes possible to clearly recognize that the taillights and brake lights of the vehicle 1 are illuminated.

[0028] The light-emitting device 10 has a first light-emitting section 11, a second light-emitting section 12, and a third light-emitting section 13, allowing it to have multiple light-emitting sections that emit light with different peak emission wavelengths. Furthermore, as shown in Figures 2 to 5, the first light-emitting element 31 and first light-transmitting member 51 included in the first light-emitting section 11, the second light-emitting element 32 and second light-transmitting member 52 included in the second light-emitting section 12, and the third light-emitting element 33 and third light-transmitting member 53 included in the third light-emitting section 13 are all arranged on a single substrate 20. In other words, multiple types of lamps corresponding to the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 are integrated into a single light-emitting device 10 (one package). This reduces the number of components compared to a configuration in which multiple light-emitting devices each function as different types of lamps, and allows for miniaturization of the rear lamp in the vehicle 1. In addition, the configuration of the control circuit that controls the light-emitting operation of the light-emitting device 10 can be simplified. The details of each component of the light-emitting device 10 will be described below.

[0029] (Circuit board 20) The substrate 20 comprises a base material 21 and wiring sections such as top surface wiring 22. The substrate 20 may also include an integrated circuit for controlling the light-emitting operation of each of the multiple light-emitting elements 30. An example of an integrated circuit is an electronic circuit such as an ASIC (Application Specific Integrated Circuit). The substrate 20 has a substantially rectangular external shape when viewed from above. However, the substrate 20 may have other external shapes when viewed from above, such as a substantially circular, substantially elliptical, or substantially polygonal shape.

[0030] The base material 21 is the base material of the substrate 20. In the examples shown in Figures 2 to 5, the upper surface of the base material 21 defines the upper surface of the substrate 20. The lower surface of the base material 21 defines the lower surface of the substrate 20. The side surface of the base material 21 defines the side surface of the substrate 20. The base material 21 is made of, for example, an insulating material or a semiconductor material. Examples of the substrate 20 include semiconductor substrates such as silicon, ceramic substrates such as aluminum nitride, and resin substrates such as glass epoxy.

[0031] Multiple top surface wirings 22 are arranged on the upper surface of the substrate 20. These multiple top surface wirings 22 are joined to one end of the wire 80. Other portions of the multiple top surface wirings 22 are joined to the positive and negative pairs of electrodes that each of the multiple light-emitting elements 30 has. Of the multiple top surface wirings 22, the top surface wirings 22 joined to one end of the wire 80 and the top surface wirings 22 joined to the positive and negative pairs of electrodes of the light-emitting elements 30 are electrically connected, for example, via inner layer wiring arranged inside the base material 21. As a result, power (drive current and drive voltage) from an external power source is supplied to each of the multiple light-emitting elements 30 via the top surface wirings 61 of the package substrate 60, the wire 80, and the top surface wirings 22 of the substrate 20.

[0032] Examples of materials constituting the top wiring 22 include metals such as gold, silver, copper, aluminum, nickel, rhodium, titanium, platinum, palladium, molybdenum, chromium, and tungsten, as well as alloys containing these metals. The top wiring 22 may have a single-layer structure composed of these metals or alloys, or it may have a laminated structure in which multiple layers composed of these metals or alloys are stacked.

[0033] (light-emitting element 30) Multiple light-emitting elements 30 are arranged on a substrate 20. In the example shown in Figure 3, the multiple light-emitting elements 30 are arranged along a first direction X and a second direction Y. However, the multiple light-emitting elements 30 may be arranged in directions different from the first direction X and the second direction Y.

[0034] Each of the multiple light-emitting elements 30 has a semiconductor structure and a positive and negative pair of electrodes. The semiconductor structure comprises a first semiconductor layer having a first conductivity type, an active layer, and a second semiconductor layer having a second conductivity type different from the first conductivity type. The first semiconductor layer, the active layer, and the second semiconductor layer are stacked in this order along the Z-axis. One of the first and second semiconductor layers is an n-type semiconductor layer. The other of the first and second semiconductor layers is a p-type semiconductor layer. The active layer may have a single quantum well (SQW) structure or a multiple quantum well (MQW) structure including multiple well layers.

[0035] A positive and negative pair of electrodes are arranged, for example, at positions spaced apart from each other on the lower surface of the semiconductor structure. One of the positive and negative electrodes is electrically connected to the first semiconductor layer. The other of the positive and negative electrodes is electrically connected to the second semiconductor layer. Each of the positive and negative electrodes may be made of a metal or alloy similar to the upper surface wiring 22 of the substrate 20, for example.

[0036] Examples of light-emitting elements 30 include light-emitting elements that emit blue light, green light, and red light. Examples of light-emitting elements 30 that emit blue light and green light include nitride semiconductor In x Al y Ga 1-x-y Examples include semiconductor structures composed of N(0≦x, 0≦y, x+y≦1). Furthermore, examples of light-emitting elements 30 that emit red light include those having a semiconductor structure composed of GaAlAs or AlInGaP. The composition and emission color of the light-emitting element 30 can be appropriately selected according to the purpose.

[0037] The multiple light-emitting elements 30 include multiple first light-emitting elements 31, multiple second light-emitting elements 32, and multiple third light-emitting elements 33. As shown in Figure 3, the multiple first light-emitting elements 31, the multiple second light-emitting elements 32, and the multiple third light-emitting elements 33 are separated from each other by a light-shielding member 40. In the example shown in Figure 3, the multiple first light-emitting elements 31 are separated from the multiple second light-emitting elements 32 and the multiple third light-emitting elements 33 in a first direction X when viewed from above. That is, the first light-emitting element 11 is separated from the second light-emitting elements 12 and the third light-emitting elements 13 in a first direction X when viewed from above. Also, the multiple second light-emitting elements 32 are separated from the multiple third light-emitting elements 33 in a second direction Y when viewed from above. That is, the second light-emitting element 12 is separated from the third light-emitting element 13 in a second direction Y when viewed from above. However, the relative positions of the multiple first light-emitting elements 31 (first light-emitting section 11), the multiple second light-emitting elements 32 (second light-emitting section 12), and the multiple third light-emitting elements 33 (third light-emitting section 13) are not limited to the example shown in Figure 3.

[0038] Each of the multiple first light-emitting elements 31 emits, for example, blue light. In this case, each of the multiple first light-emitting elements 31 has a semiconductor structure made of a nitride semiconductor. The emission peak wavelength of the light emitted by each of the multiple first light-emitting elements 31 is, for example, 400 nm to 530 nm. However, the emission peak wavelength of the light emitted by each of the multiple first light-emitting elements 31 is not limited to this.

[0039] Each of the multiple second light-emitting elements 32 emits, for example, blue light. In this case, each of the multiple second light-emitting elements 32 has a semiconductor structure made of a nitride semiconductor. The emission peak wavelength of the light emitted by each of the multiple second light-emitting elements 32 is, for example, 400 nm to 530 nm. However, the emission peak wavelength of the light emitted by each of the multiple second light-emitting elements 32 is not limited to this.

[0040] Each of the multiple third light-emitting elements 33 emits, for example, blue light. In this case, each of the multiple third light-emitting elements 33 has a semiconductor structure made of a nitride semiconductor. The emission peak wavelength of the light emitted by each of the multiple third light-emitting elements 33 is, for example, 400 nm to 530 nm. However, the emission peak wavelength of the light emitted by each of the multiple third light-emitting elements 33 is not limited to this.

[0041] Each of the multiple third light-emitting elements 33 may emit, for example, red light. In this case, each of the multiple third light-emitting elements 33 has a semiconductor structure made of a semiconductor such as GaAlAs or AlInGaP. The emission peak wavelength of the light emitted by each of the multiple third light-emitting elements 33 is, for example, 600 nm to 780 nm. However, the emission peak wavelength of the light emitted by each of the multiple third light-emitting elements 33 is not limited to this.

[0042] When the third light-emitting element 33 emits red light, the chromaticity of the light emitted from the third light-emitting element 33 may satisfy the aforementioned conditions for the chromaticity of the light irradiated by the third light-emitting unit 13. In this case, the third light-emitting unit 13 does not need to include the third light-transmitting member 53. Also, if the third light-emitting unit 13 includes the third light-transmitting member 53, the third light-transmitting member 53 does not need to have a third phosphor. That is, the third light-transmitting member 53 may be a clear layer that transmits light emitted from the third light-emitting element 33 without wavelength conversion.

[0043] (First translucent member 51, second translucent member 52, third translucent member 53) Each of the first translucent member 51, the second translucent member 52, and the third translucent member 53 further includes a substrate containing a translucent material. The first phosphor is disposed within the substrate of the first translucent member 51. The second phosphor is disposed within the substrate of the second translucent member 52. The third phosphor is disposed within the substrate of the third translucent member 53. The first phosphor and the others may be disposed on one side of the substrate. The translucent material contained in the substrate of each translucent member is translucent. Hereinafter, "translucency" refers to the property of having a transmittance of at least 60%, preferably 80%, or more for light emitted from the light-emitting element 30. Examples of translucent materials include resin materials, ceramics, and glass. Examples of resin materials include silicone resin, silicone-modified resin, epoxy resin, epoxy-modified resin, and phenolic resin.

[0044] The first light-transmitting member 51 covers multiple first light-emitting elements 31 collectively. That is, in a top view, the first light-transmitting member 51 encloses multiple first light-emitting elements 31. The second light-transmitting member 52 covers multiple second light-emitting elements 32 collectively. That is, in a top view, the second light-transmitting member 52 encloses multiple second light-emitting elements 32. The third light-transmitting member covers multiple third light-emitting elements 33 collectively. That is, in a top view, the third light-transmitting member 53 encloses multiple third light-emitting elements 33.

[0045] In the examples shown in Figures 4 and 5, the upper surface of the first translucent member 51 defines the upper surface 11U of the first light-emitting part 11. The upper surface of the second translucent member 52 defines the upper surface 12U of the second light-emitting part 12. The upper surface of the third translucent member 53 defines the upper surface 13U of the third light-emitting part 13. The thicknesses of the first translucent member 51, the second translucent member 52, and the third translucent member 53 may be the same or different from each other.

[0046] For example, the first, second, and third phosphors are yttrium aluminum garnet-based phosphors (e.g., (Y,Gd)3(Al,Ga)5O 12:Ce, hereinafter referred to as "YAG phosphor"), lutetium aluminum garnet-based phosphor (e.g., Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet-based phosphor (e.g., Tb3(Al,Ga)5O 12 :Ce), CCA-based phosphor (e.g., Ca 10 (PO4)6Cl2:Eu), SAE-based phosphor (e.g., Sr4Al 14 O 25 :Eu), chlorosilicate-based phosphor (e.g., Ca8MgSi4O 16 Cl2:Eu), silicate-based phosphor (e.g., (Ba,Sr,Ca,Mg)2SiO4:Eu), β-sialon-based phosphor (e.g., (Si,Al)3(O,N)4:Eu) or α-sialon-based phosphor (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu) and other oxynitride-based phosphors, LSN-based phosphor (e.g., (La,Y)3Si6N 11 :Ce), BSESN-based phosphor (e.g., (Ba,Sr)2Si5N8:Eu), SLA-based phosphor (e.g., SrLiAl3N4:Eu), CASN-based phosphor (e.g., CaAlSiN3:Eu) or SCASN-based phosphor (e.g., (Sr,Ca)AlSiN3:Eu) and other nitride-based phosphors, KSF-based phosphor (e.g., K2SiF6:Mn), KSAF-based phosphor (e.g., K2(Si 1-x Al x )F 6-x :Mn Here, x satisfies 0 < x < 1.) or MGF-based phosphor (e.g., 3.5MgO·0.5MgF2·GeO2:Mn) and other fluoride-based phosphors, quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I)3 Here, FA and MA represent formamidinium and methylammonium, respectively.), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se)2) etc. can be used.

[0047] It is preferable that the first, second, and third phosphors are of different types. For example, a phosphor that emits yellow light can be used as the first phosphor. An example of a phosphor that emits yellow light is a YAG phosphor. For example, a phosphor that emits orange light can be used as the second phosphor. Examples of phosphors that emit orange light include BSESN phosphors and YAG phosphors containing Gd. For example, a phosphor that emits red light can be used as the third phosphor. Examples of phosphors that emit red light include CASN phosphors, SCASN phosphors, KSF phosphors, and KSAF phosphors.

[0048] (Light-shielding member 40) The light-shielding member 40 has light-shielding properties. Here, "light-shielding properties" in this specification refer to the property of being difficult to transmit light through. The property of being difficult to transmit light through includes the property of blocking light, the property of absorbing light (light absorption), and the property of reflecting light (light reflection). For example, if the light-shielding member 40 contains a filler that has light absorption properties, the light absorption rate of the light-shielding member 40 is 50% or more, 60% or more, and 70% or more with respect to light with an emission peak wavelength of 450 nm. For example, if the light-shielding member 40 contains a filler that has light reflection properties, the reflectance of the light-shielding member 40 is 70% or more, 80% or more, and 90% or more with respect to light with an emission peak wavelength of 450 nm. The reflectance and light absorption rate can be measured, for example, using a spectrophotometer.

[0049] The light-shielding member 40 separates the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 when viewed from above. As shown in Figures 4 and 5, the upper end 40U (the +Z side end) of the light-shielding member 40 is located above the upper surface 11U of the first light-emitting section 11, the upper surface 12U of the second light-emitting section 12, and the upper surface 13U of the third light-emitting section 13. This reduces the possibility that light emitted by the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 may reach above the other light-emitting sections. For example, even when at least two of the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 are lit simultaneously, the mixing of light emitted by two or more different light-emitting sections can be reduced. As a result, it is possible to clearly distinguish which of the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 is lit. In other words, it is possible to clearly distinguish which of the lamps corresponding to each light-emitting part is lit.

[0050] The light-shielding member 40 includes, for example, a base material made of a resin material such as a thermosetting resin, and at least one of a light-reflective filler, a light-diffusing filler, and a light-absorbing filler. Preferably, the light-shielding member 40 includes a black-colored filler that absorbs light. By including a black-colored filler in the light-shielding member 40, the distinction between the first light-emitting part 11, the second light-emitting part 12, and the third light-emitting part 13 and the light-shielding member 40 can be improved. That is, the outer edges of the first light-emitting part 11, the second light-emitting part 12, and the third light-emitting part 13 can be clearly distinguished. In this specification, "black" means a property that absorbs 70% or more of visible light. In other words, "black" in this specification includes not only black but also colors that approximate black, such as dark gray and dark brown.

[0051] The light-shielding member 40 preferably contains a carbon-based material such as activated carbon, graphite, carbon black, or graphene as a black filler. As shown in Figures 2 and 3, the light-shielding member 40 is adjacent to each of the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13. By including a carbon-based material with excellent heat dissipation properties in the light-shielding member 40, the heat generated when the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 irradiates light can be efficiently dissipated to the outside. As a result, the degradation of the multiple light-emitting elements 30 constituting the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 can be reduced.

[0052] Here, it is preferable that the third light-emitting section 13 is in contact with the light-shielding member 40 in both the first direction X and the second direction Y. When approximately the same driving current flows through each light-emitting element 30, the amount of heat generated by the third light-emitting section 13, which has a relatively large number of light-emitting elements 30 (third light-emitting elements 33), is greater than the amount of heat generated by the first light-emitting section 11 and the second light-emitting section 12. Therefore, by having the third light-emitting section 13 in contact with the light-shielding member 40 containing a carbon-based material in both the first direction X and the second direction Y, the heat generated by the third light-emitting section 13, which has a relatively large amount of heat, can be efficiently dissipated to the outside. As a result, the deterioration of the multiple third light-emitting elements 33 provided by the third light-emitting section 13 can be reduced.

[0053] As shown in Figure 3, the light-shielding member 40 has, for example, a first portion 41 extending in a second direction Y and a second portion 42 extending in a first direction X. One end of the second portion 42 is continuous with the first portion 41. However, the light-shielding member 40 is not limited to having the configuration shown in Figures 2 and 3, as long as it has a configuration that allows the first light-emitting portion 11, the second light-emitting portion 12, and the third light-emitting portion 13 to be distinguished when viewed from above.

[0054] The first portion 41 of the light-shielding member 40 is located between the first light-emitting part 11 and the second light-emitting part 12, and between the first light-emitting part 11 and the third light-emitting part 13. The second portion 42 of the light-shielding member 40 is located between the second light-emitting part 12 and the third light-emitting part 13. Preferably, the width 40W1 of the first portion 41 along the first direction X is wider than the width 40W2 of the second portion 42 along the second direction Y. That is, preferably, the width 40W1 of the light-shielding member 40 located between the first light-emitting part 11 and the second light-emitting part 12 along the first direction X, and the width 40W1 of the light-shielding member 40 located between the first light-emitting part 11 and the third light-emitting part 13 along the first direction X is wider than the width 40W2 of the light-shielding member 40 located between the second light-emitting part 12 and the third light-emitting part 13 along the second direction Y.

[0055] If the light emitted by the first light-emitting unit 11 mixes with the light emitted by the second light-emitting unit 12 and / or the third light-emitting unit 13 above the first light-emitting unit 11, the color temperature of the light emitted by the first light-emitting unit 11 may decrease. In this case, the visibility of the light emitted by the first light-emitting unit 11 may decrease. According to the embodiment, since the width 40W1 of the first portion 41 along the first direction X is wider than the width 40W2 of the second portion 42 along the second direction Y, the possibility of the light emitted by the second light-emitting unit 12 and / or the light emitted by the third light-emitting unit 13 reaching above the first light-emitting unit 11 can be reduced. That is, the mixing of the light emitted by the first light-emitting unit 11 with the light emitted by the second light-emitting unit 12 and / or the light emitted by the third light-emitting unit 13 can be reduced, and the decrease in the color temperature of the light emitted by the first light-emitting unit 11 can be reduced. As a result, the visibility of the light emitted by the first light-emitting unit 11 can be improved. Accordingly, the illumination of the first light-emitting unit 11 can be clearly recognized.

[0056] <Example 1> Next, an example of the configuration of the light-emitting device 10A according to Modification 1 of the Embodiment will be described with reference to Figures 6 to 8. Figure 6 is a schematic top view showing the light-emitting device 10A according to Modification 1. Figure 7 is a schematic cross-sectional view showing the cross-section of the light-emitting device 10A cut along the line VII-VII shown in Figure 6. Figure 8 is a schematic cross-sectional view showing the cross-section of the light-emitting device 10A cut along the line VIII-VIII shown in Figure 6. Note that in Figures 6 to 8, all of the covering member 70 of the light-emitting device 10A is omitted. In Modification 1, components similar to those in the Embodiment are denoted by the same reference numerals, and their descriptions are omitted as appropriate.

[0057] In the light-emitting device 10A according to Modification 1, the configurations of the first light-emitting unit 11A and the third light-emitting unit 13A differ mainly from those of the first light-emitting unit 11 and the third light-emitting unit 13 in the embodiment. First, an example of the configuration of the first light-emitting unit 11A will be described.

[0058] As shown in Figure 6, the first light-emitting unit 11A has a first region 11A1 capable of emitting light of a first color temperature and a second region 11A2 capable of emitting light of a second color temperature different from the first color temperature. The first light-emitting unit 11A is configured to be able to adjust the color of the light from the first region 11A1 and the light from the second region 11A2. The second color temperature may be lower or higher than the first color temperature. In the example shown in Figure 6, the first region 11A1 is arranged to surround the second region 11A2 when viewed from above. However, the relative positions of the first region 11A1 and the second region 11A2 are not limited to this.

[0059] As shown in Figure 7, among the multiple first light-emitting elements 31 of the first light-emitting unit 11A, the first light-emitting element 31 located in the first region 11A1 and the first light-emitting element 31 located in the second region 11A2 may have the same configuration. The first light-emitting element 31 located in the first region 11A1 and the first light-emitting element 31 located in the second region 11A2 emit, for example, blue light. For the sake of explanation, the first light-emitting element 31 located in the first region 11A1 will be referred to as "first light-emitting element 31a1," and the first light-emitting element 31 located in the second region 11A2 will be referred to as "first light-emitting element 31a2."

[0060] The first light-transmitting member 51A located in the first region 11A1 has a first wavelength conversion layer 51A1. That is, the first region 11A1 has a plurality of first light-emitting elements 31a1 and the first wavelength conversion layer 51A1. The first wavelength conversion layer 51A1 is placed on the first light-emitting elements 31a1. The first wavelength conversion layer 51A1 may include a phosphor that is excited by light emitted from the first light-emitting elements 31a1. The first wavelength conversion layer 51A1 may include, for example, a phosphor that emits yellow light.

[0061] The first light-transmitting member 51A located in the second region 11A2 has a second wavelength conversion layer 51A2 and a third wavelength conversion layer 51A3 stacked in the Z-axis direction. That is, the second region 11A2 has a plurality of first light-emitting elements 31a2, a second wavelength conversion layer 51A2, and a third wavelength conversion layer 51A3. The second wavelength conversion layer 51A2 is placed on the first light-emitting elements 31a2. The third wavelength conversion layer 51A3 is placed on the second wavelength conversion layer 51A2. As shown in Figure 7, the upper surface of the third wavelength conversion layer 51A3 may be continuous with the upper surface of the first wavelength conversion layer 51A1.

[0062] The second wavelength conversion layer 51A2 may include a phosphor that is excited by light emitted from the first light-emitting element 31a2. The second wavelength conversion layer 51A2 may include, for example, a phosphor that emits orange light. The third wavelength conversion layer 51A3 may include a phosphor that is excited by light emitted from the first light-emitting element 31a2 and / or light emitted from the second wavelength conversion layer 51A2. The third wavelength conversion layer 51A3 may include, for example, a phosphor that emits yellow light.

[0063] From the first region 11A1, light is irradiated that is a mixture of light emitted from the first light-emitting element 31a1 and light emitted from the first wavelength conversion layer 51A1. The light irradiated from the first region 11A1 has a first color temperature. From the second region 11A2, light is irradiated that is a mixture of light emitted from the first light-emitting element 31a2, light emitted from the second wavelength conversion layer 51A2, and light emitted from the third wavelength conversion layer 51A3. The light irradiated from the second region 11A2 has a second color temperature. The first color temperature is, for example, 4500K or more and 7500K or less. The second color temperature is, for example, a color temperature of 1500K or more and less than 4500K.

[0064] By turning on the first light-emitting element 31a1 and turning off the first light-emitting element 31a2, light is emitted only from the first region 11A1. That is, light having a first color temperature is emitted from the first light-emitting unit 11A. Furthermore, by turning off the first light-emitting element 31a1 and turning on the first light-emitting element 31a2, light is emitted only from the second region 11A2. That is, light having a second color temperature is emitted from the first light-emitting unit 11A. In addition, by turning on both the first light-emitting element 31a1 and the first light-emitting element 31a2, light is emitted from both the first region 11A1 and the second region 11A2. That is, light having a third color temperature, which is a mixture of light having a first color temperature from the first region A1 and light having a second color temperature from the second region, is emitted from the first light-emitting unit 11A. The third color temperature is different from the first and second color temperatures.

[0065] By switching the first light-emitting element 31a1 on and off, and the first light-emitting element 31a2 on and off, the color temperature of the light emitted from the first light-emitting unit 11A can be changed. This allows the light emitted from the first light-emitting unit 11A to be color-adjusted. However, the color temperature of the light that is easily visible may differ depending on the time of day and external environment such as the weather when the vehicle 1 is traveling. According to modified example 1A, since the light emitted from the first light-emitting unit 11A can be color-adjusted according to the external environment, the visibility of the light emitted from the first light-emitting unit 11A can be improved regardless of the external environment.

[0066] Next, an example of the configuration of the third light-emitting unit 13A will be described. As shown in Figure 6, the third light-emitting unit 13A has a tail lamp unit 13A1 and a brake lamp unit 13A2. The tail lamp unit 13A1 lights up when the headlights of the vehicle 1 are turned on. The brake lamp unit 13A2 lights up when the driver presses the brake pedal of the vehicle 1. In other words, the brake lamp unit 13A2 lights up when the vehicle 1 is braked.

[0067] In the example shown in Figure 6, the taillight section 13A1 is positioned to the +Y side of the brake light section 13A2. However, the relative positions of the taillight section 13A1 and the brake light section 13A2 are not limited to this. For example, the brake light section 13A2 may be positioned to the +Y side of the taillight section 13A1. Also, one of the taillight section 13A1 and the brake light section 13A2 may be positioned in a frame-like manner outside the other taillight section 13A1 and the brake light section 13A2.

[0068] As shown in Figure 8, among the multiple third light-emitting elements 33 of the third light-emitting unit 13A, the third light-emitting element 33 of the tail lamp unit 13A1 and the third light-emitting element 33 of the brake lamp unit 13A2 may have the same configuration. The third light-emitting element 33 of the tail lamp unit 13A1 and the third light-emitting element 33 of the brake lamp unit 13A2 emit, for example, blue light. For the sake of explanation, the third light-emitting element 33 of the tail lamp unit 13A1 will be referred to as "third light-emitting element 33a1," and the third light-emitting element 33 of the brake lamp unit 13A2 will be referred to as "third light-emitting element 33a2."

[0069] The third light-emitting section 13A has a third translucent member 53A which has a low-concentration region 53A1 in which the concentration of the third phosphor is low, and a high-concentration region 53A2 in which the concentration of the third phosphor is higher than that of the low-concentration region 53A1. The third phosphor is a red phosphor. The tail lamp section 13A1 includes the low-concentration region 53A1 in the third translucent member 53A. The low-concentration region 53A1 is arranged on the third light-emitting element 33a1. The brake lamp section 13A2 includes the high-concentration region 53A2 in the third translucent member 53A. The high-concentration region 53A2 is arranged on the third light-emitting element 33a2.

[0070] Since the concentration of the third phosphor in the brake lamp section 13A2 is higher than that of the third phosphor in the tail lamp section 13A1, the intensity of the light emitted by the brake lamp section 13A2 can be made higher than the intensity of the light emitted by the tail lamp section 13A1. As a result, even if the vehicle 1 is braked while the tail lamp section 13A1 is illuminated, it is possible to clearly recognize that the brake lamp section 13A2 is illuminated.

[0071] <Modification 2> Next, with reference to Figure 9, an example of the configuration of the light-emitting device 10B according to the modified embodiment 2 will be described. Figure 9 is a schematic cross-sectional view showing a cross-section of the light-emitting device 10B according to the modified embodiment 2. Note that in Figure 9, all of the covering members 70 of the light-emitting device 10B are omitted. In the modified embodiment 2, the same reference numerals are used for components that are the same as those in the embodiment and modified embodiment 1, and their descriptions are omitted as appropriate.

[0072] In the light-emitting device 10B according to Modification 2, the configuration of the light-shielding member 40B differs mainly from that of the light-shielding member 40 in the embodiment and the modification. As shown in Figure 9, the light-shielding member 40B includes a light-absorbing member 40B1 and a light-reflecting member 40B2. The light-absorbing member 40B1 is placed on the substrate 20. The light-reflecting member 40B2 is placed on the light-absorbing member 40B1.

[0073] The light-absorbing member 40B1 contains a light-absorbing filler. Examples of light-absorbing fillers include carbon-based materials such as activated carbon, graphite, carbon black, and graphene. The light absorption rate of the light-absorbing member 40B1 is higher than that of the light-reflecting member 40B2. For example, the light absorption rate of the light-absorbing member 40B1 is 50% or more, 60% or more, and 70% or more for light with an emission peak wavelength of 450 nm.

[0074] The light-reflective member 40B2 contains a light-reflective filler. Examples of light-reflective fillers include inorganic particles such as titanium dioxide, zirconium oxide, aluminum oxide, and boron nitride. The light reflectance of the light-reflective member 40B2 is higher than that of the light-absorbing member 40B1. For example, the light reflectance of the light-reflective member 40B2 is 70% or more, 80% or more, and 90% or more for light with an emission peak wavelength of 450 nm.

[0075] By placing the light-reflective member 40B2 on the light-absorbing member 40B1, it is possible to prevent the light-absorbing member 40B1 from being directly illuminated by ambient light. This prevents deterioration such as scorching or deformation of the light-absorbing member 40B1. Furthermore, by placing the light-reflective member 40B2 on the light-absorbing member 40B1, it is possible to reduce the possibility that the light emitted by each light-emitting part (first light-emitting part 11, second light-emitting part 12, third light-emitting part 13) reaches above the adjacent light-emitting part.

[0076] As shown in Figure 9, the thickness of the light-absorbing member 40B1 may be greater than or equal to the thickness of the first light-emitting section 11 and the second light-emitting section 12. Furthermore, the thickness of the light-absorbing member 40B1 may be greater than or equal to the thickness of the third light-emitting section 13. This allows for maintaining a clear distinction between the first light-emitting section 11, the second light-emitting section 12, and the third light-emitting section 13 and the light-shielding member 40B.

[0077] <Light-emitting module 2> Next, an example of the configuration of the light-emitting module 2 according to the embodiment will be described with reference to Figure 10. Figure 10 is a schematic cross-sectional view showing a cross-section of the light-emitting module 2 according to the embodiment (a cross-sectional view that includes the first light-emitting section 11 and the third light-emitting section 13 of the light-emitting device 10C provided by the light-emitting module 2, and is cut along the XZ plane). For convenience, one first light-emitting element 31 is shown in Figure 10. However, the first light-emitting section 11 has a plurality of first light-emitting elements 31. Also, for convenience, one third light-emitting element 33 is shown in Figure 10. However, the third light-emitting section 13 has a plurality of third light-emitting elements 33.

[0078] The light-emitting module 2 comprises a light-emitting device 10C and a lens 3. In the light-emitting device 10C, the position of the upper surface 11U of the first light-emitting section 11 in the height direction (Z-axis direction) is different from the position of the upper surface 13U of the third light-emitting section 13 in the height direction. Other configurations of the light-emitting device 10C may be the same as those of the light-emitting device 10 shown in Figures 1 to 5. In the example shown in Figure 10, the position of the upper surface 11U of the first light-emitting section 11 in the height direction is at a distance D0 above the position of the upper surface 13U of the third light-emitting section 13 in the height direction.

[0079] Lens 3 is positioned above the light-emitting device 10C. In the example shown in Figure 10, lens 3 is a concave meniscus lens. However, lens 3 may be of other types.

[0080] Because the upper surface 11U of the first light-emitting section 11 and the upper surface 13U of the third light-emitting section 13 are at different heights, the height of the focal point F1 of the light emitted from the light-emitting element (first light-emitting element 31) constituting the first light-emitting section 11 and passing through the lens 3 is different from the height of the focal point F2 of the light emitted from the light-emitting element (third light-emitting element 33) constituting the third light-emitting section 13 and passing through the lens 3. In the example shown in Figure 10, the height distance between the focal point F1 and the focal point F2 is, for example, distance D1.

[0081] Assuming that the distance from the light-emitting device 10C to the road surface coincides with the focusing point F2 of the light emitted from the third light-emitting element 33, the light emitted from the first light-emitting element 31 will spread out on the road surface by, for example, a width W. In other words, the difference in the height position between the upper surface 11U of the first light-emitting element 11 and the upper surface 13U of the third light-emitting element 13 allows the illumination range of the light emitted by the first light-emitting element 11 to be widened. Here, the first light-emitting element 11 is a light-emitting element that functions as a backup lamp. Therefore, by widening the illumination range of the light emitted by the first light-emitting element 11, it becomes clearer that the vehicle 1 is reversing.

[0082] <Vehicle 1> Next, an example of the configuration of the vehicle 1 according to the embodiment will be described with reference to Figures 11 to 14. Figure 11 is a block diagram showing an example of the configuration of the control unit 1C of the vehicle 1 according to the embodiment. Figure 12 is a schematic diagram showing a first example of the vehicle 1 according to the embodiment. Figure 13 is a schematic diagram showing a second example of the vehicle 1 according to the embodiment. Figure 14 is a schematic diagram showing a third example of the vehicle 1 according to the embodiment.

[0083] (Control Unit 1C) As shown in Figure 11, the vehicle 1 comprises a light-emitting device 10 and a control unit 1C that controls the light-emitting operation of the light-emitting device 10. A light-emitting device 10A or a light-emitting device 10B may be used instead of the light-emitting device 10. Alternatively, the vehicle 1 may also comprise a light-emitting module 2 equipped with the light-emitting device 10C and a control unit 1C.

[0084] The control unit 1C is, for example, a microcomputer such as an in-vehicle ECU (Electronic Control Unit). However, the control unit IC may be a control circuit located inside the light-emitting device 10. The vehicle 1 may also be further equipped with a sensor 1D that outputs an electrical signal indicating information about the surroundings of the vehicle 1 to the control unit 1C. Examples of the sensor 1D include an image sensor such as a camera, an infrared sensor, and an ultrasonic sensor.

[0085] The control unit 1C includes a processor 1C1 such as a CPU (Central Processing Unit), a memory 1C2 such as a ROM (Read Only Memory) and flash memory, and an input / output interface 1C3 for inputting and outputting various signals. The processor 1C1 controls the operation of the control unit 1C according to the program stored in the memory 1C2. The processor 1C1 outputs control signals for controlling the light emission operation of the light emission device 10 via the input / output interface 1C3. The memory 1C2 is an example of a storage medium for storing programs. The memory 1C2 can further store information regarding the light pattern that the light emission device 10 irradiates onto the road surface.

[0086] (First example of Vehicle 1) Referring to Figure 12, a first example of vehicle 1 will be described. As shown in Figure 12, vehicle 1 is equipped with two light-emitting devices 10 as rear lamps. The two light-emitting devices 10 are located at the left and right ends of the rear of vehicle 1, respectively. For the sake of explanation, the light-emitting device 10 located at the left end of the rear of vehicle 1 will be called "light-emitting device 10L", and the light-emitting device 10 located at the right end of the rear of vehicle 1 will be called "light-emitting device 10R".

[0087] In the first example, the control unit 1C can control the light-emitting devices 10L and 10R respectively in response to its determination that the vehicle 1 has started to reverse. Specifically, the control unit 1C controls the first light-emitting unit 11 to emit light, and controls at least one of the second light-emitting unit 12 and the third light-emitting unit 13 to emit light. At this time, the control signal output from the control unit 1C includes information for controlling at least one of the second light-emitting unit 12 and the third light-emitting unit 13 to emit the first light pattern 10P1 (see Figure 12) onto the road surface. The control unit 1C can also determine the start of the vehicle 1's reverse movement based on a signal from an ECU different from the control unit 1C.

[0088] In each of the light-emitting devices 10L and 10R, which receive control signals from the control unit 1C, when the vehicle is reversing, the first light-emitting unit 11 illuminates the road surface with light, while at least one of the second light-emitting unit 12 and the third light-emitting unit 13 illuminates the road surface with the first light pattern 10P1. The first light pattern 10P1 illuminated from at least one of the second light-emitting unit 12 and the third light-emitting unit 13 may be constantly lit or may blink during the illumination period. In the example shown in Figure 12, the second light-emitting unit 12 illuminates the road surface with the first light pattern 10P1.

[0089] In the example shown in Figure 12, the first light pattern 10P1 is composed of a strip-shaped light pattern 10P1a irradiated from the second light-emitting section 12 of the light-emitting device 10L and a strip-shaped light pattern 10P1b irradiated from the second light-emitting section 12 of the light-emitting device 10R. The width of the first light pattern 10P1 is the same as the width of the vehicle 1. In this specification, "same width" means that the width of the first light pattern 10P1 matches the width of the vehicle 1, and that the difference between the width of the first light pattern 10P1 and the width of the vehicle 1 is within +5% of the width of the vehicle 1.

[0090] With light from the first light-emitting unit 11 shining onto the road surface, at least one of the second light-emitting unit 12 and the third light-emitting unit 13 shines a first light pattern 10P1 with the same width as the vehicle 1 onto the road surface. This enhances the visibility of the first light pattern 10P1 while clearly allowing the vehicle 1 to pass through the area.

[0091] (Second example of Vehicle 1) Referring to Figure 13, a second example of vehicle 1 will be described. In the second example, the control unit 1C can detect an obstacle 5 located behind vehicle 1 based on an electrical signal output from sensor 1D. In the second example, upon detecting the obstacle 5, the control unit 1C can control the light-emitting device 10 so that the first light-emitting unit 11 emits light, and so that at least one of the second light-emitting unit 12 and the third light-emitting unit 13 emits the second light pattern 10P2.

[0092] As shown in Figure 13, the second light pattern 10P2 is a light pattern for indicating the presence of an obstacle 5 behind the vehicle 1. In the example shown in Figure 13, the third light-emitting unit 13 illuminates the road surface with the second light pattern 10P2. Preferably, the second light pattern 10P2 is illuminated on or near the obstacle 5. However, the illumination position of the second light pattern 10P2 is not limited to these. Also, the second light pattern 10P2 may be constantly lit during the illumination period or may flash. Note that the form of the second light pattern 10P2 is not limited to that shown in Figure 13.

[0093] With light from the first light-emitting unit 11 shining onto the road surface, at least one of the second light-emitting unit 12 and the third light-emitting unit 13 shines the second light pattern 10P2 onto the road surface. This increases the visibility of the second light pattern 10P2, making the presence of the obstacle 5 more clearly recognizable.

[0094] (Third example of Vehicle 1) Referring to Figure 14, a third example of vehicle 1 will be described. In this third example, the control unit 1C can control the light-emitting device 10 to change the mode of the second light pattern 10P2 when the distance between vehicle 1 and obstacle 5 falls below a predetermined threshold, based on an electrical signal from sensor 1D. At this time, the control unit 1C selects the changed second light pattern 10P2 by referring to memory 1C2. The predetermined threshold for the distance between vehicle 1 and obstacle 5 can be adjusted as appropriate.

[0095] At least one of the second light-emitting unit 12 and the third light-emitting unit 13 changes the pattern of the second light pattern 10P2 in response to a control signal from the control unit 1C when the distance between the vehicle 1 and the obstacle 5 falls below a predetermined threshold. As shown in Figure 14, it is preferable that the changed second light pattern 10P2 is a pattern that more strongly alerts the driver of the vehicle 1 than the second light pattern 10P2 before the change. However, the pattern of the changed second light pattern 10P2 is not limited to the example shown in Figure 14.

[0096] When the distance between vehicle 1 and obstacle 5 falls below a predetermined threshold (i.e., when the distance between vehicle 1 and obstacle 5 decreases), the mode of the second light pattern 10P2 can be changed to make the presence of obstacle 5 more clearly recognizable.

[0097] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0098] The aspects of this disclosure are, for example, as follows: <Item 1> A light-emitting device for the rear lamp of a vehicle, circuit board and A plurality of light-emitting elements constituting a first light-emitting section, a second light-emitting section, and a third light-emitting section are arranged on the substrate, In a top view, it has a light-shielding member that separates the first light-emitting part, the second light-emitting part, and the third light-emitting part, The first light-emitting unit has a chromaticity such that, in the XYZ color system defined in JIS Z8781-3:2016, the range of the chromaticity coordinate x is 0.310 ≤ x ≤ 0.500, and the range of the chromaticity coordinate y is y ≤ 0.150 + 0.640x, y ≥ 0.050 + 0.750x, and 0.382 ≤ y ≤ 0.440, and emits light having a brightness of 250 lm or more at a driving voltage of 13.5 V. The second light-emitting unit emits light having a chromaticity such that, in the XYZ color system specified in JIS Z8781-3:2016, the range of the chromaticity coordinate y is 0.398 ≤ y ≤ 0.429 and the range of the chromaticity coordinate z is z ≤ 0.007, and has a brightness of 150 lm or more at a driving voltage of 13.5 V. The third light-emitting unit is a light-emitting device that emits light having a chromaticity such that, in the XYZ color system specified in JIS Z8781-3:2016, the range of the chromaticity coordinate y is y ≤ 0.335 and the range of the chromaticity coordinate z is z ≤ 0.008, and has a brightness of 180 lm or more at a driving voltage of 13.5 V. <Item 2> The upper end of the light-shielding member is located above the upper surface of the first light-emitting part, the upper surface of the second light-emitting part, and the upper surface of the third light-emitting part. The light-emitting device described in item 1 above. <Item 3> When the light-emitting device is attached to the vehicle, the second light-emitting section extends in the width direction of the vehicle. The light-emitting device described in item 1 or item 2 above. <Item 4> The first light-emitting unit has a first region capable of irradiating light of a first color temperature, and a second region capable of irradiating light of a second color temperature which is a different color temperature from the first color temperature. The light from the first region and the light from the second region can be toned to color. A light-emitting device according to any one of the above items <1> to <3>. <Item 5> The first light-emitting part is spaced apart from the second light-emitting part and the third light-emitting part in a first direction when viewed from above. The second light-emitting portion is separated from the third light-emitting portion in a second direction perpendicular to the first direction when viewed from above. The width of the light-shielding member located between the first light-emitting portion and the second light-emitting portion along the first direction, and the width of the light-shielding member located between the first light-emitting portion and the third light-emitting portion along the first direction, are wider than the width of the light-shielding member located between the second light-emitting portion and the third light-emitting portion along the second direction. A light-emitting device according to any one of the above items <1> to <4>. <Item 6> The light-shielding member includes a carbon-based material, The light-emitting device described in item 5 above. <Clause 7> The plurality of light-emitting elements include a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of third light-emitting elements. The first light-emitting unit comprises a plurality of the first light-emitting elements, The second light-emitting section comprises a plurality of the second light-emitting elements, The third light-emitting section comprises a plurality of the third light-emitting elements, The number of third light-emitting elements provided by the third light-emitting unit is greater than the number of first light-emitting elements provided by the first light-emitting unit and the number of second light-emitting elements provided by the second light-emitting unit. The third light-emitting portion is in contact with the light-shielding member in both the first and second directions. The light-emitting device described in item 6 above. <Item 8> The light-shielding member comprises a light-absorbing member disposed on the substrate and a light-reflecting member disposed on the light-absorbing member. A light-emitting device according to any one of the above items <1> to <7>. <Clause 9> A light-emitting device according to any one of <Clause 1> to <Clause 8> above, A lens positioned above the light-emitting device, Equipped with, The position of the upper surface of the first light-emitting part in the height direction is different from the position of the upper surface of the third light-emitting part in the height direction. A light-emitting module in which the position in the height direction of the focal point of light emitted from the light-emitting element constituting the first light-emitting section and passing through the lens is different from the position in the height direction of the focal point of light emitted from the light-emitting element constituting the third light-emitting section and passing through the lens. <Item 10> A vehicle equipped with a light-emitting device as described in any one of <Item 1> to <Item 8> above, A vehicle in which, when the vehicle is reversing, the first light-emitting unit irradiates light onto the road surface, while at least one of the second light-emitting unit and the third light-emitting unit irradiates a first light pattern with the same width as the width of the vehicle onto the road surface. <Item 11> A vehicle equipped with a light-emitting device as described in any one of <Item 1> to <Item 8> above, A vehicle in which, when the vehicle is reversing, the first light-emitting unit irradiates light onto the road surface, and at least one of the second light-emitting unit and the third light-emitting unit irradiates a second light pattern on the road surface to indicate the presence of an obstacle in response to a control signal from a control unit that has detected an obstacle on the road surface. <Item 12> At least one of the second light-emitting unit and the third light-emitting unit changes the mode of the second light pattern when the distance between the vehicle and the obstacle falls below a predetermined threshold. The vehicle described in item 11 above. [Explanation of Symbols]

[0099] 1 vehicle 2 Light-emitting modules 3 lenses 10, 10A, 10B, 10C Light-emitting device 11,11A First light-emitting section 12 Second light-emitting section 13,13A Third light-emitting section 20 circuit boards 30 light-emitting elements 31 First light-emitting element 32. Second light-emitting element 33 Third light-emitting element 40,40B Light-shielding material 40B1 Light-absorbing material 40B2 Light-reflective material 51,51A 1st translucent member 52 Second translucent member 53,53A Third translucent member 60 Package Substrates 70 Covering member 80 wires

Claims

1. A light-emitting device for the rear lamp of a vehicle, circuit board and A plurality of light-emitting elements constituting a first light-emitting section, a second light-emitting section, and a third light-emitting section are arranged on the substrate, In a top view, it has a light-shielding member that separates the first light-emitting part, the second light-emitting part, and the third light-emitting part, The first light-emitting unit has a chromaticity in the XYZ color system defined in JIS Z8781-3:2016, where the range of the chromaticity coordinate x is 0.310 ≤ x ≤ 0.500, and the range of the chromaticity coordinate y is y ≤ 0.150 + 0.640x, y ≥ 0.050 + 0.750x, and 0.382 ≤ y ≤ 0.440, and emits light having a brightness of 250 lm or more at a driving voltage of 13.5 V. The second light-emitting unit emits light having a chromaticity such that, in the XYZ color system defined in JIS Z8781-3:2016, the range of the chromaticity coordinate y is 0.398 ≤ y ≤ 0.429 and the range of the chromaticity coordinate z is z ≤ 0.007, and has a brightness of 150 lm or more at a driving voltage of 13.5 V. The third light-emitting unit is a light-emitting device that emits light having a chromaticity such that, in the XYZ color system defined in JIS Z8781-3:2016, the range of the chromaticity coordinate y is y ≤ 0.335 and the range of the chromaticity coordinate z is z ≤ 0.008, and has a brightness of 180 lm or more at a driving voltage of 13.5 V.

2. The upper end of the light-shielding member is located above the upper surface of the first light-emitting part, the upper surface of the second light-emitting part, and the upper surface of the third light-emitting part, The light-emitting device according to claim 1.

3. When the light-emitting device is attached to the vehicle, the second light-emitting section extends in the width direction of the vehicle. The light-emitting device according to claim 1 or claim 2.

4. The first light-emitting unit has a first region capable of irradiating light of a first color temperature, and a second region capable of irradiating light of a second color temperature which is a different color temperature from the first color temperature. The light from the first region and the light from the second region can be toned to color. The light-emitting device according to claim 1 or claim 2.

5. The first light-emitting section, when viewed from above, is separated from the second light-emitting section and the third light-emitting section in a first direction. The second light-emitting portion is separated from the third light-emitting portion in a second direction perpendicular to the first direction when viewed from above. The width of the light-shielding member located between the first light-emitting portion and the second light-emitting portion along the first direction, and the width of the light-shielding member located between the first light-emitting portion and the third light-emitting portion along the first direction, are wider than the width of the light-shielding member located between the second light-emitting portion and the third light-emitting portion along the second direction. The light-emitting device according to claim 1 or claim 2.

6. The light-shielding member includes a carbon-based material, The light-emitting device according to claim 5.

7. The plurality of light-emitting elements include a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of third light-emitting elements. The first light-emitting unit comprises a plurality of the first light-emitting elements, The second light-emitting unit comprises a plurality of the second light-emitting elements, The third light-emitting section comprises a plurality of the third light-emitting elements, The number of third light-emitting elements in the third light-emitting unit is greater than the number of first light-emitting elements in the first light-emitting unit and the number of second light-emitting elements in the second light-emitting unit. The third light-emitting portion is in contact with the light-shielding member in both the first and second directions. The light-emitting device according to claim 6.

8. The light-shielding member comprises a light-absorbing member disposed on the substrate and a light-reflecting member disposed on the light-absorbing member. The light-emitting device according to claim 1 or claim 2.

9. A light-emitting device according to claim 1 or claim 2, A lens positioned above the light-emitting device, Equipped with, The position of the upper surface of the first light-emitting part in the height direction is different from the position of the upper surface of the third light-emitting part in the height direction. A light-emitting module in which the position in the height direction of the focal point of light emitted from the light-emitting element constituting the first light-emitting section and passing through the lens is different from the position in the height direction of the focal point of light emitted from the light-emitting element constituting the third light-emitting section and passing through the lens.

10. A vehicle equipped with a light-emitting device according to claim 1 or claim 2, A vehicle in which, when the vehicle is reversing, the first light-emitting unit irradiates light onto the road surface, while at least one of the second light-emitting unit and the third light-emitting unit irradiates the road surface with a first light pattern having the same width as the width of the vehicle.

11. A vehicle equipped with a light-emitting device according to claim 1 or claim 2, A vehicle in which, when the vehicle is reversing, the first light-emitting unit irradiates light onto the road surface, and at least one of the second light-emitting unit and the third light-emitting unit irradiates a second light pattern on the road surface to indicate the presence of an obstacle in response to a control signal from a control unit that has detected an obstacle on the road surface.

12. At least one of the second light-emitting unit and the third light-emitting unit changes the mode of the second light pattern when the distance between the vehicle and the obstacle falls below a predetermined threshold. The vehicle according to claim 11.

Images