Light source for lighting and lighting equipment

Abstract

To improve the efficiency of light collection while suppressing the degradation of a light-emitting element.SOLUTION: A light source for lighting includes a plurality of light emitting sections and a substrate on which the plurality of light emitting sections are placed, and each light emitting section has a first heat conduction section placed on the substrate, a light emitting element placed on the first heat conduction section, and a second heat conduction section having a thermal conductivity lower than that of the first heat conduction section and placed on the first heat conduction section and around the light emitting element when viewed in the stacking direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an illumination light source and an illumination device. [Background technology]

[0002] In the light emitting device described in Patent Document 1, the intervals between the aligned light emitting elements are set small in order to approximate a state in which light is emitted from a point light source. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-153134 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the spacing between multiple light-emitting elements arranged is small, heat generated from each light-emitting element is concentrated locally, causing deterioration of the light-emitting element and even causing the light-emitting element to break down. For this reason, a technology that can suppress deterioration of the light-emitting element while improving the light-collection efficiency has been desired. [Means for solving the problem]

[0005] (1) According to one aspect of the present disclosure, there is provided an illumination light source including a plurality of light-emitting units and a substrate on which the plurality of light-emitting units are disposed, and each of the light-emitting units includes a first thermally conductive unit disposed on the substrate, a light-emitting element disposed on the first thermally conductive unit, and a second thermally conductive unit having a thermal conductivity lower than that of the first thermally conductive unit, the second thermally conductive unit being disposed on the first thermally conductive unit around the light-emitting element when viewed in the stacking direction. According to the above embodiment, since the second thermal conductive section is disposed around each light-emitting element, even when the light-emitting sections are close to each other, the distance between the light-emitting elements is ensured to some extent. Also, since the light-emitting element is disposed on the first thermal conductive section, which has a higher thermal conductivity than the second thermal conductive section, the heat generated from the light-emitting element is more easily transferred to the first thermal conductive section than to the second thermal conductive section. Therefore, it is possible to prevent the heat generated from the light-emitting element from reaching the light-emitting element included in another light-emitting section disposed near the light-emitting section. Therefore, it is possible to prevent localized concentration of the heat generated by the light-emitting element.

[0006] (2) In the illumination light source of the above form, the first thermal conduction portion of each of the plurality of light-emitting portions is formed as a separate body, the first thermal conduction portions of adjacent light-emitting portions among the plurality of light-emitting portions in a direction intersecting the stacking direction are in contact with each other, and on the side where the first thermal conduction portions of the adjacent light-emitting portions are in contact with each other, the light-emitting elements of the adjacent light-emitting portions may not be in contact with each other. According to the above embodiment, even if the first thermal conductive parts of adjacent light-emitting parts are in contact with each other, the second thermal conductive parts are disposed around the light-emitting elements of the adjacent light-emitting parts. Therefore, the light-emitting elements of the adjacent light-emitting parts are not in contact with each other. This makes it possible to suppress concentration of heat generated from the light-emitting elements.

[0007] (3) In the illumination light source of the above form, the second thermal conductive portion of each of the plurality of light-emitting portions may be formed separately, and the second thermal conductive portions of the adjacent light-emitting portions may be in contact with each other in the intersecting direction.

[0008] (4) In the illumination light source of the above aspect, the light emitting element may be an LED, and the light emitting portion may be configured as a surface mount type LED package.

[0009] (5) In the illumination light source of the above aspect, the interval between the adjacent light-emitting portions may be 0.3 millimeters or less, and no object may be disposed between the adjacent light-emitting portions. According to the above embodiment, since the intervals between the light emitting portions are small, the light emitting efficiency of the entire illumination light source is improved.

[0010] (6) In the illumination light source of the above form, the light emission color of the light-emitting element included in one of the plurality of light-emitting units may be different from the light emission color of the light-emitting element included in at least one of the other light-emitting units adjacent to the one light-emitting unit. According to the above aspect, since the light emitting portions are arranged close to each other, it is possible to reduce color variation due to color mixing.

[0011] (7) In the illumination light source of the above aspect, the light emitting elements included in each of the plurality of light emitting sections may have the same emission color.

[0012] (8) According to another aspect of the present disclosure, there is provided an illumination device including the illumination light source of the above aspect and a light guide component that guides light generated by the illumination light source. According to the above aspect, it is possible to provide a lighting device with high luminous efficiency.

[0013] (9) According to yet another aspect of the present disclosure, there is provided an illumination device including the illumination light source of the above aspect and a lens that collects light generated by the illumination light source. According to the above aspect, it is possible to provide a lighting device with high luminous efficiency. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a top view of an illumination light source according to the embodiment. [Diagram 2] 2 is a cross-sectional view showing the II-II cross section of the illumination light source in FIG. 1. [Diagram 3] FIG. 2 is a perspective view of a light-emitting portion included in the illumination light source. [Figure 4]FIG. 2 is an explanatory diagram for explaining a configuration of a light-emitting unit. [Diagram 5] FIG. 4 is an explanatory diagram regarding the range in which light from a light-emitting portion spreads. [Figure 6] FIG. 11 is an explanatory diagram regarding the range in which light spreads when three light-emitting units are arranged. [Figure 7] FIG. 11 is a diagram showing an example of an arrangement of light-emitting parts in another embodiment 2. [Figure 8] 13A and 13B are diagrams illustrating other examples of the arrangement of the light-emitting units. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A. Embodiment: Fig. 1 is a top view of an illumination light source 10 according to this embodiment. Fig. 2 is a cross-sectional view showing a cross section taken along line II-II of the illumination light source in Fig. 1. Fig. 3 is a perspective view of a light-emitting unit 100 included in the illumination light source 10. Fig. 4 is an explanatory diagram for explaining the configuration of the light-emitting unit 100. Fig. 4 is a perspective view of the light-emitting unit 100 with the second thermally conductive unit 120 not shown.

[0016] The illumination light source 10 is used as functional lighting and ambient lighting of a vehicle, and is used for attention lighting, roof lighting, foot lighting, door lighting, and the like provided in the interior of a vehicle (not shown). The illumination light source 10 is attached to an instrument panel, an interior roof, a handle, an inside handle bezel, a door trim, a door pocket, and the like. As shown in Figs. 1 and 2, the illumination light source 10 has two light-emitting units 100 and a substrate 200 on which the two light-emitting units 100 are arranged. In Figs. 1 to 4, an orthogonal coordinate system is set. The direction along the longitudinal direction of the substrate 200 is the X-axis. The direction along the lateral direction of the substrate 200 is the Y-axis. The direction along the vertical direction is the Z-axis.

[0017] The light emitting unit 100 is an LED (Light Emitting Diode) package. An LED package is an electronic component in which an LED, which is a semiconductor element, is packaged. By packaging the semiconductor element, the semiconductor element is protected and it becomes easy to mount the semiconductor element on a circuit. In the embodiment, the light emitting unit 100 is configured as a surface mount type LED package.

[0018] As shown in FIGS. 1 to 3, the light emitting section 100 includes a first heat conducting section 110, a second heat conducting section 120, an LED 160, and wiring 170. The first heat conducting section 110 is a first heat conducting section.

[0019] The first thermally conductive unit 110 is a substrate of the LED package. The light emitting unit 100 is disposed on the substrate 200, and thus the first thermally conductive unit 110 is disposed on the substrate 200. The first thermally conductive unit 110 has electrical insulation properties. The first thermally conductive unit 110 has a higher thermal conductivity than the second thermally conductive unit 120. For example, aluminum nitride (AlN) is used as a material for forming the first thermally conductive unit 110. The thermal conductivity of aluminum nitride is, for example, 150 watts per meter Kelvin (W / m·K). Alternatively, alumina (AI203) may be used, and the thermal conductivity is 30 watts per meter Kelvin (W / m·K).

[0020] An electrode 141 connected to an anode (not shown) of the LED 160 and an electrode 142 connected to a cathode (not shown) of the LED 160 are formed on an upper surface (surface on the +Z side) of the first thermally conductive section 110. An electrode 143 and an electrode 144 for connecting the light emitting section 100 to the substrate 200 are formed on a lower surface (surface on the -Z side) of the first thermally conductive section 110. The electrodes 141 to 144 are formed of a material containing, for example, copper (Cu).

[0021] The second thermally conductive section 120 encapsulates the LED 160 arranged on the first thermally conductive section 110. The second thermally conductive section 120 is formed of a transparent resin to transmit light emitted from the LED 160. For example, a silicone resin is used as a material for forming the second thermally conductive section 120. The thermal conductivity of the silicone resin is 0.2 watts per meter per Kelvin (W / m·K). The second thermally conductive section 120 is layered on the first thermally conductive section 110 so as to cover the first thermally conductive section 110 and the LED 160. The second thermally conductive section 120 is arranged around and above the LED 160 when viewed in the layering direction.

[0022] The LED 160 has a configuration in which a P-type semiconductor layer and an N-type semiconductor layer are laminated with a light-emitting layer interposed between them. The LED 160 is disposed on the electrodes 141 and 142 formed on the first thermally conductive portion 110. Thus, an anode (not shown) disposed on the lower surface (-Z side surface) of the LED 160 is connected to the electrode 141 by solder. A cathode (not shown) disposed on the lower surface (-Z side surface) of the LED 160 is connected to the electrode 142 by solder. The LED 160 is a blue LED that emits blue light when energized. The LED 160 is also called a "light-emitting element."

[0023] As shown in Figs. 1 and 3, two light-emitting units 100 are disposed on the upper surface (surface on the +Z side) of the substrate 200. On the upper surface (surface on the +Z side) of the substrate 200, a plurality of terminals (not shown) corresponding to the electrodes 143 and 144 of each light-emitting unit 100, i.e., , are provided. The substrate 200 is electrically connected to a battery provided in the vehicle. The electrodes 143 and 144 are connected by solder to corresponding terminals among the plurality of terminals provided on the substrate 200. By being electrically connected, a current flows through the light-emitting unit 100. This causes the light-emitting unit 100 to emit light.

[0024] In the embodiment, the interval between two adjacent light-emitting units 100 is set to be equal to or less than a predetermined value. The predetermined value is, for example, equal to or less than 0.3 millimeters. The interval between the two light-emitting units 100 is the distance between the ends closest to each other when viewed in the stacking direction. Note that no other object is placed between the ends closest to each other. In the example shown in FIG. 1, the interval between the two light-emitting units 100 refers to the distance between the end on the +X side of the light-emitting unit 100 arranged on the -X side and the end on the -X side of the light-emitting unit arranged on the +X side when viewed in the stacking direction. The two light-emitting units 100 are placed at desired positions on the upper surface of the substrate 200 by using self-alignment. Self-alignment refers to the action of automatically aligning electronic components due to the surface tension of molten solder. Even if there is some positional misalignment when electronic components are mounted on the substrate, the positional misalignment is canceled.

[0025] In the embodiment, the LED 160 is disposed on the first heat conducting section 110. The thermal conductivity of the first heat conducting section 110 is higher than that of the second heat conducting section 120. Therefore, the heat generated by the LED 160 is more easily transferred to the first heat conducting section 110 than to the second heat conducting section 120. As a result, the heat generated by the LED 160 is transferred to the first heat conducting section 110, not to the second heat conducting section 120, and dissipated. In addition, the LED 160 is surrounded by the second heat conducting section 120, and even when the light emitting sections 100 are close to each other, a certain amount of space between the LEDs 160 is ensured. Therefore, localized concentration of the heat generated by the LED 160 can be suppressed. Therefore, the heat generated by the LED 160 can be suppressed from reaching the LED 160 of another light emitting section 100 disposed in the vicinity of the light emitting section 100.

[0026] In the conventional case where the intervals between multiple light emitting elements are small, heat generated from a light emitting element is transferred to other adjacent light emitting elements, and the light emitting elements are easily deteriorated. However, in the embodiment, it is possible to suppress deterioration of the LED 160 caused by heat generated by the LED 160 provided in the adjacent light emitting unit 100.

[0027] Furthermore, the multiple light-emitting units 100 can be placed close to each other while suppressing localized concentration of heat generated by the LEDs 160. FIG. 5 is an explanatory diagram of the range over which light from the light-emitting unit 100 spreads. The upper part of FIG. 5 shows the range over which light spreads in the arrangement of the light-emitting units 100 according to the embodiment. For convenience, the two light-emitting units 100 are referred to as light-emitting unit 100A and light-emitting unit 100B, respectively. The lower part of FIG. 5 shows the range over which light spreads in the arrangement of the conventional light-emitting units 100. For convenience, the two light-emitting units 100 are referred to as light-emitting unit 100E and light-emitting unit 100F, respectively.

[0028] The range in which the light emitted from light-emitting unit 100A spreads is referred to as range RA, and the range in which the light emitted from light-emitting unit 100B spreads is referred to as range RB. The shaded range indicates the overlapping range of the ranges in which the light emitted from light-emitting unit 100A and light-emitting unit 100B spread. The range in which the light emitted from light-emitting unit 100E spreads is referred to as range RE, and the range in which the light emitted from light-emitting unit 100F spreads is referred to as range RF. The shaded range indicates the overlapping range of the ranges in which the light emitted from light-emitting unit 100E and light-emitting unit 100F spread.

[0029] As shown in the upper part of Fig. 5, the overlapping range (shaded portion) of the range RA and the range RB in the embodiment is larger than the overlapping range (shaded portion) of the range RE and the range RF in the conventional example as shown in the lower part of Fig. 5. As a result, for example, when light emitted from the light-emitting unit 100A and the light-emitting unit 100B is made incident on the light-guiding component, the light can be collected more efficiently than when light emitted from the light-emitting unit 100E and the light-emitting unit 100F is made incident on the light-guiding component.

[0030] B. Other embodiments: B1. Alternative embodiment 1: In the embodiment, an example has been described in which the illumination light source 10 includes two light-emitting units 100. However, the number of light-emitting units 100 may be three or more. In this case as well, it is possible to place the multiple light-emitting units 100 close to each other while suppressing localized concentration of heat generated by the LEDs 160.

[0031] Fig. 6 is an explanatory diagram of the range of light spread when three light-emitting units 100 are arranged. The upper part of Fig. 6 shows the range of light spread in the arrangement of the light-emitting units 100 according to another embodiment 1. For convenience, the three light-emitting units 100 are referred to as light-emitting unit 100A, light-emitting unit 100B, and light-emitting unit 100C. The lower part of Fig. 6 shows the range of light spread in the conventional arrangement of the light-emitting units 100. For convenience, the three light-emitting units 100 are referred to as light-emitting unit 100E, light-emitting unit 100F, and light-emitting unit 100G.

[0032] The range into which the light radiated from light-emitting unit 100A spreads is defined as range RA, the range into which the light radiated from light-emitting unit 100B spreads as range RB, and the range into which the light radiated from light-emitting unit 100C spreads as range RC. The shaded ranges indicate the overlapping ranges into which the light radiated from light-emitting units 100A to 100C spread. The range into which the light radiated from light-emitting unit 100E spreads is defined as range RE, the range into which the light radiated from light-emitting unit 100F spreads as range RF, and the range into which the light radiated from light-emitting unit 100G spreads as range RG. The shaded ranges indicate the overlapping ranges into which the light radiated from light-emitting units 100E to 100G spread.

[0033] As shown in the upper part of Fig. 6, the overlapping portion of the range RA, the range RB, and the range RC in this embodiment is smaller than the overlapping portion of the range RE, the range RF, and the range RG in the conventional example as shown in the lower part of Fig. 6. As a result, for example, when light emitted from the light-emitting unit 100A, the light-emitting unit 100B, and the light-emitting unit 100C is made incident on the light-guiding component, the light can be collected more efficiently than when light emitted from the light-emitting unit 100E, the light-emitting unit 100F, and the light-emitting unit 100G is made incident on the light-guiding component.

[0034] B2. Alternative embodiment 2: Fig. 7 is a diagram showing an example of the arrangement of the light-emitting unit 100 in Alternative Embodiment 2. In Fig. 7, the substrate 200 is omitted. In Fig. 7, the LED 160 included in the light-emitting unit 100 is arranged close to one end in the longitudinal direction of the first thermally conductive unit 110. In the embodiment, the LED 160 is arranged in the central portion in the longitudinal direction of the light-emitting unit 100. In Alternative Embodiment 2, the LED 160 is arranged not in the central portion in the longitudinal direction of the light-emitting unit 100, but in a position closer to one end in the longitudinal direction than the central portion.

[0035] In the example shown in FIG. 7, the two light-emitting units 100 are denoted as light-emitting unit 100-1 and light-emitting unit 100-2 for convenience. The light-emitting unit 100-1 and the light-emitting unit 100-2 are arranged so that their longitudinal directions are along the X-axis direction. The light-emitting unit 100-1 is arranged in an orientation such that the electrode 141 is located on the -X side and the electrode 142 is located on the +X side. The light-emitting unit 100-2 is arranged in an orientation such that the electrode 141 is located on the +X side and the electrode 142 is located on the -X side. Therefore, the LED 160 of the light-emitting unit 100-1 and the LED 160 of the light-emitting unit 100-2 are arranged so as to be close to each other. This allows for more efficient light collection than a configuration in which the LED 160 is arranged in the center part of the first heat-conducting unit 110, which is the substrate of the LED package (see FIG. 1).

[0036] FIG. 8 is a diagram showing an example of the arrangement of three light-emitting units 100. In FIG. 8, the substrate 200 is not shown. In the example shown in FIG. 8, the three light-emitting units 100 are denoted as light-emitting unit 100-1, light-emitting unit 100-2, and light-emitting unit 100-3 for the sake of convenience. In FIG. 8 as well, the light-emitting units 100-1 to 100-3 are arranged such that the LEDs 160 are close to each other. This allows efficient light collection.

[0037] B3. Alternative embodiment 3: In the embodiment, an example in which the LED 160 is a blue LED has been described. However, the LED 160 may be a red LED that emits light in red. Alternatively, the LED 160 may be a green LED that emits light in green when energized. LED emission colors include red, blue, green, blue-green, orange, and the like.

[0038] B4. Alternative embodiment 4: In the embodiment, an example in which the two LEDs 160 emit the same light is described. However, the light emitted by each of the LEDs 160 may be different. For example, by making one LED 160 a red LED and the other LED 160 a blue LED, a magenta light emission color can be obtained. By making one LED 160 a red LED and the other LED 160 a green LED, a yellow light emission color can be obtained. By making one LED 160 a blue LED and the other LED 160 a green LED, a cyan light emission color can be obtained. Since the light emitting units 100 are arranged close to each other, the color variation due to color mixing can be reduced.

[0039] 8, when three light-emitting units 100 are arranged close to each other, the light emission color of the LED 160 of one of the three light-emitting units 100 may be different from the light emission colors of the LEDs 160 of the other two light-emitting units 100. Alternatively, the light emission colors of the LEDs 160 of the three light-emitting units 100 may be different from each other.

[0040] B5. Alternative embodiment 5: The light emitted by the light emitting unit 100 can also be white. For example, a yellow phosphor can be contained in the resin constituting the second thermally conductive unit 120. The yellow phosphor is, for example, YAG (yttrium aluminum garnet) doped with cerium. A blue LED is used as the LED 160. When excited by the blue light emitted from the LED 160, the yellow phosphor emits yellow light. White light can be obtained by mixing the yellow light and the blue light.

[0041] Alternatively, the light-emitting unit 100 is configured to include three LEDs 160. The LEDs 160 emit different colors, red, blue, and green. When the three light-emitting units 100 emit light simultaneously, the red light, blue light, and green light are mixed to obtain white light.

[0042] B6. Alternative Embodiment 6: In the embodiment, an example has been described in which two light-emitting units 100 are not in contact with each other. However, two adjacent light-emitting units 100 in a direction intersecting the stacking direction may be in contact with each other. In the example shown in FIG. 2, the direction intersecting the stacking direction includes the X-axis direction and the Y-axis direction. As shown in the first embodiment, the light-emitting units 100 are LED packages, so that the first thermally conductive units 110 included in each of the two adjacent light-emitting units 100 are separate bodies, and the second thermally conductive units 120 included in each of the two adjacent light-emitting units 100 are separate bodies.

[0043] The two adjacent light-emitting sections 100 being in contact with each other includes the following three modes: A mode in which the first thermally conductive section 110 and the second thermally conductive section 120 of each of the two adjacent light-emitting sections 100 are in contact with each other; A mode in which the second thermally conductive sections 120 of each of the two adjacent light-emitting sections 100 are in contact with each other, and the first thermally conductive sections 110 of each of the two adjacent light-emitting sections 100 are not in contact with each other; A mode in which the first thermally conductive sections 110 of each of the two adjacent light-emitting sections 100 are in contact with each other, and the second thermally conductive sections 120 of each of the two adjacent light-emitting sections 100 are not in contact with each other.

[0044] Even if two adjacent light-emitting units 100 are in contact with each other, the second heat-conducting units 120 are disposed around each LED 160, so that the LEDs 160 of the two adjacent light-emitting units 100 do not come into contact with each other. Also, the LEDs 160 are disposed on the first heat-conducting unit 110. It is possible to prevent heat generated from the LEDs 160 from reaching the LEDs 160 of other light-emitting units 100 disposed near the light-emitting unit 100 in question.

[0045] B7. Alternative Embodiment 7: The illumination light source 10 described in the above-mentioned embodiment and other embodiments can be adopted in a lighting device. This lighting device can include a light guide component that guides the light generated by the illumination light source 10. For example, when the lighting device is used as ambient lighting provided in the interior of a vehicle (not shown), a light guide rod or optical fiber can be used as the light guide component. The light guide rod is formed of a resin with high transparency, such as PC (Poly Carbonate). As described above, since the multiple light emitting units 100 are arranged close to each other, the light emitting efficiency of the lighting device can be increased. In addition, a lens may be provided between the multiple light emitting units 100 and the conductive part.

[0046] The lighting device may also include a lens that collects the light generated by the multiple light-emitting units 100. This lighting device can be used, for example, as a footlight for illuminating the feet of people getting on and off a vehicle. Since the multiple light-emitting units 100 are arranged close to each other, the light-emitting efficiency of the entire lighting device can be increased.

[0047] B8. Alternative Embodiment 8: In the embodiment, an example in which the second thermally conductive section 120 is disposed around and above the LED 160 when viewed in the stacking direction has been described (see FIG. 1 and FIG. 3). However, the second thermally conductive section 120 may be disposed only around the LED 160 when viewed in the stacking direction. In this case, the second thermally conductive section 120 is not laminated on the upper part of the LED 160 when viewed in the stacking direction. In this case, a layer made of an inorganic material different from the organic material of the second thermally conductive section and having a size similar to that of the LED 160 in the X-axis and Y-axis directions is provided on the LED 160, and the second thermally conductive section is disposed around the layer when viewed in the stacking direction. In addition, the inorganic material may contain a phosphor that converts the color of light from the light emitting element into a desired color of light.

[0048] B9. Alternative Embodiment 9: The light emitting unit 100 may have a case surrounding the LED 160 on the first thermally conductive unit 110 when viewed in the stacking direction. In this case, the second thermally conductive unit 120 is filled inside the case arranged on the first thermally conductive unit 110 to encapsulate the LED 160. The case is made of, for example, epoxy resin. The thermal conductivity of epoxy resin is 0.3 watts per meter per Kelvin (W / m·K), which is lower than the thermal conductivity of the first thermally conductive unit 110.

[0049] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0050] Reference Signs List 10... Illumination light source, 100... Light emitting section, 100-1 to 100-3... Light emitting section, 100A to 100C... Light emitting section, 100E to 100G... Light emitting section, 110... First heat conducting section, 120... Second heat conducting section, 141 to 144... Electrodes, 160... LED, 170... Wiring, 200... Board

Claims

1. 1. A light source for illumination, comprising: A plurality of light emitting units; A substrate on which the plurality of light emitting units are arranged; Including, Each of the light emitting units is A first thermal conductive portion disposed on the substrate; a light emitting element disposed on the first thermal conductive portion; a second thermal conductive portion having a thermal conductivity lower than that of the first thermal conductive portion, the second thermal conductive portion being disposed on the first thermal conductive portion and around the light emitting element when viewed in a stacking direction; Equipped with Light source for lighting.

2. 2. The illumination light source according to claim 1, The first thermal conductive portion of each of the plurality of light emitting portions is formed as a separate body, Among the plurality of light-emitting units, the first thermal conductive units of adjacent light-emitting units in a direction intersecting the stacking direction are in contact with each other, the light emitting elements of the adjacent light emitting units are not in contact with each other on a side where the first thermal conductive parts of the adjacent light emitting units are in contact with each other; Light source for lighting.

3. 3. The illumination light source according to claim 2, The second thermal conductive portion of each of the plurality of light emitting portions is formed as a separate body, The second thermal conductive portions of the adjacent light emitting portions are in contact with each other in the intersecting direction. Light source for lighting.

4. 3. The illumination light source according to claim 2, The light emitting element is an LED, The light emitting unit is configured as a surface mount type LED package. Light source for lighting.

5. 5. The illumination light source according to claim 4, The distance between adjacent light emitting portions is 0.3 millimeters or less, No object is disposed between the adjacent light emitting units. Light source for lighting.

6. 5. The illumination light source according to claim 4, The light emitting color of the light emitting element included in one of the plurality of light emitting units is different from the light emitting color of the light emitting element included in at least one of the other light emitting units adjacent to the one light emitting unit. Light source for lighting.

7. 5. The illumination light source according to claim 4, The light-emitting elements included in each of the plurality of light-emitting units have the same light emission color. Light source for lighting.

8. 1. A lighting device, comprising: An illumination light source according to any one of claims 1 to 7; A light guide component that guides light generated by the illumination light source; Equipped with Lighting equipment.

9. 1. A lighting device, comprising: An illumination light source according to any one of claims 1 to 7; a lens for collecting light generated by the illumination light source; Equipped with Lighting equipment.

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