Light-emitting module

Abstract

We provide a light-emitting module that allows for color adjustment. [Solution] The light-emitting module includes a light source including a first light-emitting section that emits light of a first chromaticity and a second light-emitting section that emits light of a second chromaticity different from the first chromaticity, and a lens having a light-incident surface and a light-emitting surface, the light-incident surface having an annular first convex portion including a first light-reflecting surface, wherein the light-incident surface of the lens faces the light source, and the first light-emitting section and the second light-emitting section are located inside the first light-reflecting surface of the first convex portion in a top view.

Description

[Technical Field]

[0001] This disclosure relates to a light-emitting module. [Background technology]

[0002] Conventionally, light-emitting modules having semiconductor elements such as LEDs (Light Emitting Diodes) and optical elements such as lenses have been widely used. As such a light-emitting module, for example, Patent Document 1 discloses an illumination device comprising a light source having a plurality of light-emitting regions and capable of controlling the plurality of light-emitting regions to different light-emitting states from one another, and an optical element having a plurality of light-emitting parts facing each of the light-emitting regions of the light source and emitting the output light from each light-emitting region in different directions from one another. In this illumination device, a plurality of light-emitting elements with different color temperatures for each of the plurality of light-emitting regions are arranged two-dimensionally in each of the plurality of light-emitting regions. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2013-134898 [Overview of the project] [Problems that the invention aims to solve]

[0004] The embodiments relating to this disclosure aim to provide a light-emitting module capable of color adjustment. [Means for solving the problem]

[0005] A light-emitting module according to one embodiment of the present disclosure includes a light source including a first light-emitting unit that emits light of a first chromaticity and a second light-emitting unit that emits light of a second chromaticity different from the first chromaticity, and a lens having a light-incident surface and a light-emitting surface, the light-incident surface having an annular first convex portion including a first light-reflecting surface, wherein the light-incident surface of the lens faces the light source, and the first light-emitting unit and the second light-emitting unit are located inside the first light-reflecting surface of the first convex portion in a top view. [Effects of the Invention]

[0006] According to embodiments of this disclosure, a color-tunable light-emitting module can be provided. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic top view of a light-emitting module according to the first embodiment. [Figure 2] This is a schematic cross-sectional view along line II-II in Figure 1. [Figure 3] This is a schematic top view showing a first example of a light source in a light-emitting module according to the first embodiment. [Figure 4] This is a schematic cross-sectional view along the line IV-IV in Figure 3. [Figure 5] This is a schematic top view showing a second example of a light source in the light-emitting module according to the first embodiment. [Figure 6] This is a schematic cross-sectional view along the line VI-VI in Figure 5. [Figure 7] This figure shows the behavior of light emitted from the first light-emitting section and the second light-emitting section of the light-emitting module according to the first embodiment. [Figure 8] This figure shows the behavior of light emitted from the third light-emitting section of the light source in the light-emitting module according to the first embodiment. [Figure 9] This figure shows the illuminance on the illuminated surface when only the first and second light-emitting parts of the light source of the light-emitting module according to the first embodiment are illuminated. [Figure 10]FIG. 1 is a diagram illustrating illuminance on an irradiation surface when all light-emitting portions of a light source included in a light-emitting module according to a first embodiment emit light. [Figure 11] FIG. 2 is a diagram explaining the distance from an optical axis to an annular first convex portion in a lens included in the light-emitting module according to the first embodiment. [Figure 12] FIG. 3 is a diagram showing an example of the relationship between the distance from the optical axis to the annular first convex portion and optical characteristics in the lens included in the light-emitting module according to the first embodiment. [Figure 13] FIG. 4 is a diagram showing an example of the relationship between the shapes of the annular first convex portion and an inner region, and optical characteristics in the lens included in the light-emitting module according to the first embodiment. [Figure 14] FIG. 5 is a diagram explaining the irradiation angle of light emitted from a light source. [Figure 15] FIG. 6 is a schematic top view of a light-emitting module according to a modification of the first embodiment. [Figure 16] FIG. 7 is a schematic cross-sectional view taken along line XVI-XVI of FIG. 15. [Figure 17] FIG. 8 is a diagram showing an example of color unevenness when the light-emission pattern of a light source included in the light-emitting module according to the modification of the first embodiment is changed. [Figure 18] FIG. 9 is a schematic top view of a light-emitting module according to a second embodiment. [Figure 19] FIG. 10 is a schematic cross-sectional view taken along line XIX-XIX of FIG. 18. DESCRIPTION OF EMBODIMENTS

[0008] A light-emitting module according to the embodiments of this disclosure will be described in detail with reference to the drawings. However, the embodiments shown below are illustrative of light-emitting modules that embody the technical concept of this embodiment and are not limited thereto. Furthermore, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of this disclosure to only those specific embodiments, unless otherwise stated, but are merely illustrative examples. Note that the size, positional relationships, etc. of the members shown in each drawing may be exaggerated for clarity of explanation. Also, in the following description, the same name and reference numerals indicate the same or identical members, and detailed explanations will be omitted as appropriate. In some cases, end view diagrams showing only the cut surface will be used as cross-sectional views.

[0009] In the diagrams shown below, directions may be indicated by the X, Y, and Z axes, but the X, Y, and Z axes are mutually orthogonal. The X direction along the X axis and the Y direction along the Y axis indicate directions along the light-emitting surface of the light-emitting part of the light-emitting module provided in the embodiment. The Z direction along the Z axis indicates a direction perpendicular to the light-emitting surface. That is, the light-emitting surface of the light-emitting part is parallel to the XY plane, and the Z axis is perpendicular to the XY plane.

[0010] In the X direction, the direction the arrow is pointing is denoted as the +X side, and the opposite side of the +X side is denoted as the -X side. In the Y direction, the direction the arrow is pointing is denoted as the +Y side, and the opposite side of the +Y side is denoted as the -Y side. In the Z direction, the direction the arrow is pointing is denoted as the +Z side, and the opposite side of the +Z side is denoted as the -Z side. In this embodiment, the light-emitting part of the light-emitting module is assumed to emit light towards the +Z side as an example. However, these do not restrict the orientation of the light-emitting module when using the embodiment, and the orientation of the light-emitting module according to this embodiment is arbitrary.

[0011] In this specification, the surface of an object viewed from the +Z side is referred to as the "top surface," and the surface of an object viewed from the -Z side is referred to as the "bottom surface." In some cases, the +Z side viewed from the object is referred to as "upper," and the -Z side viewed from the object is referred to as "lower." In the embodiments shown below, "along the X, Y, and Z axes" includes the object having an inclination within ±10° of these axes. In this specification, orthogonality may include an error of ±10° from 90°. In this specification, "along" may include an error of ±10° from 0°. Furthermore, "positioned" is not limited to cases where two objects are in contact with each other, but also includes cases where one object is positioned relative to another object, for example, via another member. "Thickness" refers to the length of the object in the Z direction unless otherwise specified.

[0012] In this specification or in the claims, when there are multiple components and each is to be expressed separately, the components may be distinguished by adding "1st," "2nd," etc., to their names. Furthermore, the objects being distinguished may differ between this specification and the claims.

[0013] [First Embodiment] <Configuration of the light-emitting module according to the first embodiment> The configuration of the light-emitting module according to the first embodiment will be described with reference to Figures 1 to 6. Figure 1 is a schematic top view of the light-emitting module 100 according to the first embodiment. Figure 2 is a schematic cross-sectional view taken along line II-II in Figure 1. Figure 3 is a schematic top view showing a first example of the configuration of the light source 1 of the light-emitting module 100. Figure 4 is a schematic cross-sectional view taken along line IV-IV in Figure 3. Figure 5 is a schematic top view showing a second example of the configuration of the light source 1 of the light-emitting module 100. Figure 6 is a schematic cross-sectional view taken along line VI-VI in Figure 5.

[0014] The light-emitting module 100 is, for example, a light source for the flash of an imaging device mounted on a smartphone, or a light source used in the flashlight function of a smartphone. The imaging device includes cameras for taking still images and video cameras for taking videos.

[0015] As shown in Figures 1 and 2, the light-emitting module 100 includes a light source 1 which includes a first light-emitting section 1A-1 that emits light of a first chromaticity and a second light-emitting section 1A-2 that emits light of a second chromaticity different from the first chromaticity. The light-emitting module 100 also includes a lens 2 which has a light incident surface 21 and a light outgoing surface 22, and the light incident surface 21 has an annular first convex portion 23 which includes a first light reflecting surface 230.

[0016] In the example shown in Figures 1 and 2, the light-emitting module 100 further comprises a substrate 3 on which the light source 1 and lens 2 are arranged, and a first adhesive member 4. The lens 2 is bonded to the upper surface 31 of the substrate 3 by the first adhesive member 4. The light source 1 further comprises a plurality of third light-emitting units 1A-3, each emitting light of a third chromaticity different from that of a first chromaticity and a second chromaticity. In the example shown in Figures 1 and 2, the color temperature of the light of the first chromaticity is higher than that of the light of the second chromaticity, and the color temperature of the light of the third chromaticity is in the range between the color temperature of the light of the first chromaticity and the color temperature of the light of the second chromaticity. The color temperatures of the light of the first chromaticity and the color temperatures of the light of the second chromaticity are between 2500K and 6500K. In this embodiment, the color temperatures of the light of the first chromaticity, the color temperatures of the light of the second chromaticity, and the color temperatures of the light of the third chromaticity are between duv+0.0010 and duv+0.015. Because the color temperature of the light with the first chromaticity, the color temperature of the light with the second chromaticity, and the color temperature of the light with the third chromaticity are above the blackbody radiation locus (towards the Duv+ side), they approach green on the chromaticity diagram, and therefore the light emitted by the light-emitting module 100 is more easily perceived as brighter in photopic vision.

[0017] In the example shown in Figure 1, the light-emitting module 100 is approximately circular when viewed from above. In a top view, the outer shape of the lens 2 is the same as the outer shape of the light-emitting module 100. In the example shown in Figure 1, the lens 2 is approximately circular when viewed from above. However, the light-emitting module 100 and the lens 2 are not limited to being approximately circular when viewed from above, and may have other shapes such as approximately elliptical, approximately rectangular, or approximately polygonal.

[0018] The light source 1 is mounted on the upper surface 31 of the substrate 3. In the example shown in Figure 1, the outer shape of the light source 1 in a top view is approximately rectangular. The light source 1 comprises a plurality of light-emitting units. In the example shown in Figure 1, the light source 1 comprises 26 light-emitting units 1A, each having an approximately rectangular light-emitting surface 10. The 26 light-emitting units 1A include a first light-emitting unit 1A-1, a second light-emitting unit 1A-2, and a third light-emitting unit 1A-3.

[0019] The first light-emitting section 1A-1 and the second light-emitting section 1A-2 are located in the central section 1B of the light source 1 when viewed from above. The first light-emitting section 1A-1 and the second light-emitting section 1A-2 are symmetrical with respect to the Y-axis when viewed from above, and are also point-symmetrical with respect to the center 1BC of the central section 1B of the light source 1. The central section 1B is the part that overlaps with the center 1CC of the light-emitting region 1C when viewed from above. The light-emitting region 1C corresponds to the region that includes the light-emitting surface 10. If the light source 1 includes multiple light-emitting surfaces 10, the light-emitting region 1C is the region that connects the outer edges of the light-emitting surfaces 10 located on the outside when viewed from above. In the example shown in Figure 1, one first light-emitting section 1A-1 and one second light-emitting section 1A-2 are arranged side by side in the X direction in the central section 1B. However, if the light source 1 has at least one first light-emitting part 1A-1 and at least one second light-emitting part 1A-2 in the central part 1B, it may further have at least one of multiple first light-emitting parts 1A-1 and multiple second light-emitting parts 1A-2. Also, at least one of multiple first light-emitting parts 1A-1 and multiple second light-emitting parts 1A-2 may be arranged in a matrix.

[0020] The multiple third light-emitting units 1A-3 are located around the central part 1B of the light source 1 when viewed from above. The first light-emitting unit 1A-1, the second light-emitting unit 1A-2, and the third light-emitting unit 1A-3 are formed integrally. "Integrated" means that they are one and cannot be separated. In the example shown in Figure 1, the 26 light-emitting units 1A include 24 third light-emitting units 1A-3 arranged in the outer peripheral region so as to surround the entire circumference of the central part 1B. The 24 third light-emitting units 1A-3 are arranged in a matrix around the central part 1B. In other words, the multiple third light-emitting units 1A-3 are located around the central part 1B of the light source 1.

[0021] From another perspective, m and n are distinct positive integers, and the light source 1 has multiple light-emitting units 1A that are (m rows × m columns) or (m rows × n columns) as a whole. In a top view, the multiple light-emitting units 1A include one or more first light-emitting units 1A-1 and one or more second light-emitting units 1A-2 in the central part 1B of the light source 1. In the example shown in Figure 1, m=5, and the light source 1 has 5 × 5 + 1 = 26 light-emitting units 1A. In a top view, the 26 light-emitting units 1A include one first light-emitting unit 1A-1 and one second light-emitting unit 1A-2 in the central part 1B of the light source 1.

[0022] The light-emitting surface 10 refers to the main light extraction surface of the light-emitting unit 1A. Therefore, the light-emitting surface 10 of the light-emitting unit 1A is also the light-emitting surface of the light source 1. In the first example of the light source 1 shown in Figure 3, the light-emitting region 1C is composed of 26 light-emitting surfaces 10. The shape of the outer edge of the light-emitting region 1C is approximately rectangular when viewed from above. The light-emitting region 1C includes four corners 1K. However, the number of light-emitting units 1A included in the light source 1 is not limited to 26. As a second example of light-emitting units 1A included in the light source 1, as shown in Figure 5, the light source 1D may include at least a first light-emitting unit 1A-1 and a second light-emitting unit 1A-2 located in the central part 1B, and eight third light-emitting units 1A-3 located around the central part 1B. The light source 1 is not limited to a rectangle when viewed from above, and may have other shapes such as approximately circular, approximately elliptical, or approximately polygonal.

[0023] In this embodiment, the light incident surface 21 of the lens 2 faces the light source 1, and the first light-emitting portion 1A-1 and the second light-emitting portion 1A-2 are located inside the first light-reflecting surface 230 of the first convex portion 23 in a top view. In the example shown in Figure 2, the lens 2 has a light-transmitting portion 20 including the light incident surface 21 and the light-emitting surface 22, and a first support portion 25 that supports the light-transmitting portion 20. The first support portion 25 is bonded to the upper surface 31 of the substrate 3 by placing a first adhesive member 4 between the lower surface 25a of the first support portion 25 and the upper surface 31 of the substrate 3. In the example shown in Figure 1, in a top view, the center 1CC of the light-emitting region 1C coincides with the optical axis 2C of the lens 2. The light source 1 emits light from the light-emitting surfaces 10 included in each of the plurality of light-emitting portions 1A in the direction in which the light incident surface 21 of the lens 2 is located.

[0024] In the example shown in Figure 2, lens 2 is a biconvex lens. The light incident surface 21 includes a convex surface that is convex on the side where the light source 1 is located, and the light emission surface 22 includes a convex surface that is convex on the side opposite to where the light source 1 is located. The inner region 24 surrounded by the first convex portion 23 on the light incident surface 21 is a concave surface that is concave in the direction opposite to the direction in which the light source 1 is located. The annular first convex portion 23 and the first light reflecting surface 230 of lens 2 each have a circular annular shape centered on the optical axis 2C of lens 2 when viewed from above.

[0025] In the example shown in Figure 1, the optical axis 2C of lens 2, the center 24C of the inner region 24 surrounded by the first convex portion 23, and the center 1CC of the light-emitting region 1C of light source 1 overlap with each other in a top view. The center 24C of the inner region 24 surrounded by the first convex portion 23 is, in other words, the central axis 23C of the first convex portion 23. Also, the center 24C of the inner region 24 surrounded by the first convex portion 23 overlaps with the center 1BC of the central part 1B of light source 1 in a top view. The optical axis 2C, the central axis 23C, the center 1CC of the light-emitting region 1C, the center 24C of the inner region 24, and the center 1BC of the central part 1B all overlap with each other. For this reason, in Figure 1, the symbols for the optical axis 2C, the central axis 23C, the center 1CC of the light-emitting region 1C, the center 24C of the inner region 24, and the center 1BC of the central part 1B are shown together. In subsequent figures, symbols may also be shown together for the same purpose.

[0026] The first light-emitting unit 1A-1, the second light-emitting unit 1A-2, and the 24 third light-emitting units 1A-3 are individually drivable. In other words, the light source 1 may be driven individually in the first light-emitting unit 1A-1, the second light-emitting unit 1A-2, and the 24 third light-emitting units 1A-3, or in groups. If the light source 1 includes multiple first light-emitting units 1A-1, each of the multiple first light-emitting units 1A-1 may be driven individually, or in groups. Similarly, if the light source 1 includes multiple second light-emitting units 1A-2, each of the multiple second light-emitting units 1A-2 may be driven individually, or in groups. Each of the first light-emitting unit 1A-1, the second light-emitting unit 1A-2, and the 24 third light-emitting units 1A-3 emits light toward a lens 2 located above the light source 1.

[0027] In the light-emitting module 100, the distribution of the current supplied to each of the first light-emitting section 1A-1, the second light-emitting section 1A-2, and the 24 third light-emitting sections 1A-3 can be controlled to control the light distribution of the light emitted from the light-emitting module 100.

[0028] The light-emitting module 100 can individually or in groups illuminate each of its first light-emitting section 1A-1, second light-emitting section 1A-2, and 24 third light-emitting sections 1A-3 at a desired brightness. This makes it possible to increase the contrast of the illuminated light on the illuminated surface illuminated by light from the light source 1. Furthermore, by individually or in groups illuminating each of the first light-emitting section 1A-1, second light-emitting section 1A-2, and 24 third light-emitting sections 1A-3, the light-emitting module 100 can partially illuminate the illuminated surface. Here, partial illumination means illuminating a part of the illuminated surface with light.

[0029] When the light-emitting module 100 is used as a light source for the flash of an imaging device, for example, the light emitted from the light-emitting module 100 can be switched between a wide-angle mode and a narrow-angle mode. The wide-angle mode is a mode in which only a part of the third light-emitting section 1A-3 is emitted, a mode in which all of the third light-emitting section 1A-3 is emitted and the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are not emitted, or a mode in which all of the third light-emitting section 1A-3, the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are emitted. In wide-angle mode, the light emitted from the light-emitting module 100 has a wide-angle light distribution. Furthermore, by adjusting the intensity of the light from the first light-emitting section 1A-1, the second light-emitting section 1A-2 and the 24 third light-emitting sections 1A-3, the light-emitting module 100 can emit a wide-angle light distribution and an ultra-wide-angle light distribution that is wider than the wide-angle light distribution. In the following explanation, wide-angle and ultra-wide-angle light distribution may be collectively referred to as wide-angle light distribution or wide-angle mode. Narrow-angle mode is a mode in which a portion of the third light-emitting section 1A-3 and the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are illuminated, or a mode in which the third light-emitting section 1A-3 is not illuminated, and only the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are illuminated. The light emitted from the light-emitting module 100 in narrow-angle mode has a narrow-angle light distribution. In other words, the beam angle in narrow-angle mode is narrower than in wide-angle mode.

[0030] Because the light-emitting module 100 can switch between wide-angle and narrow-angle modes, for example, the light emitted from the light-emitting module 100 can be used by an imaging device to take pictures according to shooting modes such as macro or telephoto. Furthermore, when the light-emitting module 100 is used as a light source for a smartphone flashlight, setting the light emitted from the light-emitting module 100 to narrow-angle mode allows the light to reach further, improving the performance of the flashlight.

[0031] The light-emitting module 100 shown in Figures 1 and 2 can change the light-emitting output of the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 based on the output of the ambient temperature sensor. Therefore, if the light-emitting output of the first light-emitting unit 1A-1 is greater than the light-emitting output of the second light-emitting unit 1A-2, the ambient temperature sensors for the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 may be located within the light-emitting module 100, or they may be located in equipment or devices provided outside the light-emitting module 100.

[0032] In this embodiment, the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 are located inside the first light-reflecting surface 230 of the first protrusion 23 when viewed from above. The light of first chromaticity emitted from the first light-emitting unit 1A-1 and reflected by the first light-reflecting surface 230 of the first protrusion 23, and the light of second chromaticity emitted from the second light-emitting unit 1A-2 and reflected by the first light-reflecting surface 230 of the first protrusion 23, overlap and mix on the illuminated surface. Specifically, using the color of the mixed light when the light output of the first light-emitting unit 1A-1 and the light output of the second light-emitting unit 1A-2 are the same as a reference, when the light output of the first light-emitting unit 1A-1 is greater than the light output of the second light-emitting unit 1A-2, the color of the mixed light is bluish, and when the light output of the first light-emitting unit 1A-1 is less than the light output of the second light-emitting unit 1A-2, the color of the mixed light is reddish. Thus, this embodiment provides a light-emitting module 100 that can be color-tuned. Furthermore, the color temperature of the light emitted by the light-emitting module 100 can be adjusted according to the ambient temperature. For example, the light-emitting module 100 can emit reddish mixed-color light when the ambient temperature is low, and bluish mixed-color light when the ambient temperature is high. In addition, the light-emitting module 100 may change the light output of the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 based on the color temperature of the ambient light or light source. For example, the light-emitting module 100 can emit bluish-white light when the color temperature of the ambient light or light source is 5000K or higher, such as the color temperature of sunlight in the daytime, and emit reddish-yellow (amber) light when the color temperature of the ambient light or light source is 3300K or lower, such as the color temperature of sunlight in the evening. Furthermore, even when the color temperature of ambient light is approximately 3500K, such as the color temperature of sunlight before sunrise, the color temperature of the light emitted from the light-emitting module 100 can be adjusted by changing the light output of the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2. In this specification, ambient light includes light incident on the interior of the light-emitting module 100.

[0033] The light source 1 has 24 third light-emitting units 1A-3, each emitting light of a third chromaticity different from that of a first chromaticity and a second chromaticity. In a top view, the first light-emitting units 1A-1 and the second light-emitting units 1A-2 are located in the central part 1B, and the 24 third light-emitting units 1A-3 are located around the central part 1B. The first light-emitting units 1A-1, the second light-emitting units 1A-2, and the third light-emitting units 1A-3 are integrally formed. With this configuration, the light-emitting module 100 can emit mixed light of light of the first chromaticity and light of the second chromaticity, as well as light of the third chromaticity.

[0034] Preferably, the color temperature of the light with the third chromaticity is within the range between the color temperature of the light with the first chromaticity and the color temperature of the light with the second chromaticity. This makes it possible to make the color temperature of the mixed light of the light with the first chromaticity and the light with the color temperature of the light with the third chromaticity the same. Furthermore, lens 2 is a biconvex lens. This allows the light with the first chromaticity and the light with the second chromaticity, reflected by the first light reflection surface 230 of the first convex portion 23, to be focused and controlled to travel toward the optical axis 2C of lens 2 when viewed from above.

[0035] In this embodiment, the inner region 24 surrounded by the first convex portion 23 on the light incident surface 21 is a concave surface that is recessed in the direction opposite to the direction in which the light source 1 is located. Because the inner region 24 is a concave surface, the light of the first chromaticity and the light of the second chromaticity that enter the inside of the lens 2 through the inner region 24 diverge due to the negative refractive power of the lens 2, so that the light of the first chromaticity and the light of the second chromaticity overlap and mix. This makes it possible to reduce color unevenness in the light emitted by the light-emitting module 100. Note that the inner region 24 may also be a convex surface that is convex in the direction in which the light source 1 is located.

[0036] Preferably, the optical axis 2C of lens 2 coincides with the center 24C of the inner region 24 surrounded by the first convex portion 23 when viewed from above. This allows the light emitted from the light source 1 and incident on the inner region 24 to be controlled with reference to the optical axis 2C of lens 2, thus facilitating the control of the light. Furthermore, preferably, the center 24C of the inner region 24 coincides with the center 1BC of the central portion 1B of the light source 1 when viewed from above. This allows the light of the first chromaticity and the light of the second chromaticity emitted from the light source 1 to be controlled with reference to the optical axis 2C of lens 2, thus facilitating the control of the light of the first chromaticity and the light of the second chromaticity. As a result, color toning control by mixing the first chromaticity and the second chromaticity becomes easier.

[0037] The light source 1 has multiple light-emitting parts that are (m rows × m columns) as a whole, or (m rows × n columns) as a whole, and it is preferable that the multiple light-emitting parts 1A include one or more first light-emitting parts 1A-1 and one or more second light-emitting parts 1A-2 in the central part 1B of the light source 1 when viewed from above. By including the first light-emitting parts 1A-1 and the second light-emitting parts 1A-2 in the central part 1B, the light of the first chromaticity from the first light-emitting part 1A-1 and the light of the second chromaticity from the second light-emitting part 1A-2 are more likely to overlap. This makes it possible to reduce color unevenness in the color matching between the first and second chromaticities.

[0038] The following describes in detail each component of the light-emitting module 100.

[0039] (First example of light source 1) Referring to Figures 3 and 4, a first example of the light source 1 will be described in detail. The light source 1 according to this embodiment includes a light-emitting section 1A including a first light-emitting section 1A-1 and a second light-emitting section 1A-2, and a base body 18. The base body 18 has a first wiring member 17 on its upper surface and a second wiring member 19 on its lower surface. The light source 1 has one first light-emitting section 1A-1, one second light-emitting section 1A-2, and 24 third light-emitting sections 1A-3. The first light-emitting section 1A-1 and the second light-emitting section 1A-2 are arranged side by side in the X direction in the central part 1B of the light source 1 when viewed from above. The third light-emitting sections 1A-3 are arranged vertically, horizontally, or in a matrix when viewed from above. To facilitate understanding, if we consider the area occupied by one first light-emitting unit 1A-1 and one second light-emitting unit 1A-2 to be equivalent to the area occupied by one third light-emitting unit 1A-3 in a top view, the example shown in Figure 3 can be considered as a 5x5 matrix overall. In this case, five third light-emitting units 1A-3 are aligned in the 1st, 2nd, 4th, and 5th rows in the X direction, respectively. Also, five third light-emitting units 1A-3 are aligned in the 1st, 2nd, 4th, and 5th columns in the Y direction, respectively. The central unit 1B is located at the position corresponding to the 3rd row and 3rd column of the 5x5 matrix. In the following explanation, the example of the arrangement of light-emitting units 1A shown in Figure 3 may be considered as a 5x5 matrix overall.

[0040] Width Wx1 is the width of the first light-emitting section 1A-1 in the X direction. Width Wx2 is the width of the second light-emitting section 1A-2 in the X direction. Width Wx3 is the width of the third light-emitting section 1A-3 in the X direction. Width Wy1 is the width of the first light-emitting section 1A-1 in the Y direction. Width Wy2 is the width of the second light-emitting section 1A-2 in the Y direction. Width Wy3 is the width of the third light-emitting section 1A-3 in the Y direction. In the example shown in Figure 3, widths Wx1 and Wx2 are approximately equal. Width Wx3 is twice width Wx1. Widths Wy1, Wy2, and Wy3 are equal to each other.

[0041] In Figure 3, to distinguish between the first light-emitting section 1A-1, the second light-emitting section 1A-2, and the third light-emitting section 1A-3, the third light-emitting section 1A-3 is represented in white, while the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are represented by different dot patterns. Also, in Figure 3, to avoid complexity, only the third light-emitting section 1A-3 located in the third row and second column out of the 24 third light-emitting sections 1A-3 is labeled.

[0042] The light source 1 includes the light-emitting surface 10 of the light-emitting unit 1A on its upper surface, and the side opposite to the light-emitting surface 10 is used as the mounting surface, and it is positioned on the upper surface 31 of the substrate 3, for example, on the +Z side of the substrate 3. The first light-emitting unit 1A-1, the second light-emitting unit 1A-2, and the 24 third light-emitting units 1A-3 all have almost the same configuration except for the dimensions when viewed from above. Therefore, in the following description, the configuration of the third light-emitting unit 1A-3 located in the 3rd row and 1st column may be described as representative.

[0043] In the example shown in Figure 4, the third light-emitting unit 1A-3 includes a light-emitting element 14, a wavelength conversion member 13 positioned above the light-emitting element 14, a light-diffusing member 12 positioned above the wavelength conversion member 13, and a first covering member 11 positioned above the light-diffusing member 12. The third light-emitting unit 1A-3 also includes a second covering member 15 that covers the sides of the first covering member 11, the light-diffusing member 12, the wavelength conversion member 13, and the light-emitting element 14.

[0044] The light-emitting element 14 has at least one pair of positive and negative electrodes 16 on the side opposite to the side facing the wavelength conversion member 13, i.e., the bottom surface. The light-emitting element 14 is placed on the substrate 18 via the electrodes 16 and the first wiring member 17. The sides of the electrodes 16 and the first wiring member 17, as well as the sides and bottom surface of the light-emitting element 14, are covered with a resin member 150. The resin member 150 absorbs external forces applied to the light-emitting element 14 from the outside during the manufacturing process, thereby reducing the external forces applied to the light-emitting element 14.

[0045] The substrate 18 has wiring on its surface, or both on its surface and inside. The first wiring member 17 and the second wiring member 19 are the wiring of the substrate 18. The light source 1 and the substrate 3 are electrically connected by conductive materials such as bumps and solder connecting the electrodes 16 of the light-emitting element 14 and the wiring of the substrate 3 via the first wiring member 17, the substrate 18, and the second wiring member 19. The configuration and size of the wiring of the substrate 3 are set according to the configuration and size of the electrodes 16 of the light-emitting element 14.

[0046] The second covering member 15 integrally holds a plurality of first covering members 11, a plurality of light diffusion members 12, and a plurality of wavelength conversion members 13. In the example shown in Figure 4, the second covering member 15 is positioned on the sides of the first covering members 11, light diffusion members 12, and wavelength conversion members 13. The second covering member 15 is positioned between adjacent first covering members 11, between adjacent light diffusion members 12, and between adjacent wavelength conversion members 13. The second covering member 15 integrally holds the first covering members 11, light diffusion members 12, and wavelength conversion members 13 provided by the first light-emitting unit 1A-1, the second light-emitting unit 1A-2, and the 24 third light-emitting units 1A-3. The upper surface of the second covering member 15 constitutes a part of the upper surface of the light source 1. The second covering member 15 also includes two long sides and two short sides, and these four sides constitute the substantially rectangular outer shape of the light source 1 when viewed from above. The second covering member 15 integrally holds multiple first covering members 11, multiple light diffusing members 12, and multiple wavelength conversion members 13, thereby facilitating the implementation of the light source 1.

[0047] By having a light source 1 comprising one first light-emitting unit 1A-1, one second light-emitting unit 1A-2, and 24 third light-emitting units 1A-3, the degree of freedom in the light patterns that can be emitted from the light source 1 is increased. The second covering member 15 may be arranged on the sides of the multiple light-emitting units 14. The second covering member 15 integrally holds the multiple light-emitting units 14 and the multiple wavelength conversion members 13, making it easier to mount the light source 1.

[0048] The light-emitting element 14 has various semiconductors such as III-V compound semiconductors and II-VI compound semiconductors. X AlY Ga 1-X-Y It is preferable to use nitride semiconductors such as N(0≦X, 0≦Y, X+Y≦1), and InN, AlN, GaN, InGaN, AlGaN, InGaAlN, etc. can also be used. The light-emitting element 14 is, for example, an LED or an LD (Laser Diode). The nitride semiconductor of the light-emitting element 14 is provided on a growth substrate such as sapphire. The light-emitting element 14 may also be obtained by forming a nitride semiconductor on a growth substrate and then removing the growth substrate. The emission peak wavelength of the light-emitting element 14 is preferably 400 nm to 530 nm, more preferably 420 nm to 490 nm, and even more preferably 450 nm to 475 nm, from the viewpoint of luminous efficiency and excitation of the wavelength conversion material described later.

[0049] The wavelength conversion member 13 is, for example, a substantially rectangular member when viewed from above. The wavelength conversion member 13 is provided so as to cover the upper surface of the light-emitting element 14. The wavelength conversion member 13 contains a wavelength conversion material that converts the wavelength of at least a portion of the light from the light-emitting element 14. The wavelength conversion member 13 can be made of a light-transmitting resin material or an inorganic material such as ceramics or glass. As the resin material, thermosetting resins such as silicone resin, silicone-modified resin, epoxy resin, epoxy-modified resin, and phenolic resin can be used. In particular, silicone resin or a modified resin thereof, which has excellent light resistance and heat resistance, is preferred. Here, light transmittance means that it is preferable to transmit 60% or more of the light from the light-emitting element 14. Furthermore, the wavelength conversion member 13 can be made of thermoplastic resins such as polycarbonate resin, acrylic resin, methylpentene resin, and polynorbornene resin. For example, the wavelength conversion member 13 may be a resin material, ceramics, glass, etc. containing a wavelength conversion material, or a sintered body of the wavelength conversion material. Furthermore, the wavelength conversion member 13 may contain a light-diffusing material described later in addition to the resin. Alternatively, the wavelength conversion member 13 may be a multilayer in which a resin layer containing the wavelength conversion material or light-diffusing material is arranged on the ±Z side of a molded body made of resin, ceramics, glass, etc.

[0050] As the wavelength conversion substance contained in the wavelength conversion member 13, for example, yttrium aluminum garnet-based phosphors (for example, (Y,Gd)₃(Al,Ga)₅O 12 :Ce), lutetium aluminum garnet-based phosphors (for example, Lu₃(Al,Ga)₅O 12 :Ce), terbium aluminum garnet-based phosphors (for example, Tb₃(Al,Ga)₅O 12 :Ce), CCA-based phosphors (for example, Ca 10 (PO₄)₆Cl₂:Eu), SAE-based phosphors (for example, Sr₄Al 14 O 25 :Eu), chlorosilicate-based phosphors (for example, Ca₈MgSi₄O 16 Cl₂:Eu), silicate-based phosphors (for example, (Ba,Sr,Ca,Mg)₂SiO₄:Eu), β-sialon-based phosphors (for example, (Si,Al)₃(O,N)₄:Eu) or α-sialon-based phosphors (for example, Ca(Si,Al) 12 (O,N) 16 :Eu) and other oxynitride-based phosphors, LSN-based phosphors (for example, (La,Y)₃Si₆N 11 :Ce), BSESN-based phosphors (for example, (Ba,Sr)₂Si₅N₈:Eu), SLA-based phosphors (for example, SrLiAl₃N₄:Eu), CASN-based phosphors (for example, CaAlSiN₃:Eu) or SCASN-based phosphors (for example, (Sr,Ca)AlSiN₃:Eu) and other nitride-based phosphors, KSF-based phosphors (for example, K₂SiF₆:Mn), KSAF-based phosphors (for example, K₂(Si 1-x Al x )F 6-x:Mn, where x satisfies 0<x<1) or MGF-based phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), or other fluoride-based phosphors, quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I)3, wherein FA and MA each represent formamidinium and methylammonium, respectively), group II-VI quantum dots (e.g., CdSe), group III-V quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se)2) may be used. The aforementioned wavelength conversion substances are particles. One of these wavelength conversion substances may be used alone, or two or more of these wavelength conversion substances may be used in combination.

[0051] The light-emitting portion 1A includes a light-emitting element 14 and a wavelength conversion member 13, and can emit mixed color light of the color of light emitted from the light-emitting element 14 and the color of light emitted from the wavelength conversion member 13. In the light-emitting portion 1A, the combination of the light-emitting element 14 and the wavelength conversion member 13 increases the degree of freedom in the color of light emitted from the light-emitting portion 1A.

[0052] In the present embodiment, the light source 1 uses a blue LED as the light-emitting element 14, and the wavelength conversion member 13 contains a wavelength conversion substance that converts the wavelength of light emitted from the light-emitting element 14 into yellow light. Thereby, the light source 1 emits white light. The wavelength or chromaticity of the light emitted from the light source 1 may be appropriately selected according to the application of the light-emitting module 100.

[0053] The light-diffusing member 12 is a member that diffuses light from the light-emitting element 14 and the wavelength conversion member 13, and is, for example, a substantially rectangular member when viewed from above. The light-diffusing member 12 can be made of a resin material containing a light-diffusing substance, for example. Examples of light-diffusing substances included in the light-diffusing member 12 include titanium dioxide, barium titanate, aluminum oxide, silicon dioxide, etc., and one of these can be used alone or two or more of these can be used in combination. Furthermore, it is preferable that the resin material be a resin material mainly composed of thermosetting resins such as epoxy resin, epoxy-modified resin, silicone resin, silicone-modified resin, and phenolic resin.

[0054] The second coating member 15 is a member that covers the sides of the first coating member 11, the light diffusion member 12, the wavelength conversion member 13, and the light-emitting element 14. The second coating member 15 directly or indirectly covers the sides of the first coating member 11, the light diffusion member 12, the wavelength conversion member 13, and the light-emitting element 14. Preferably, the second coating member 15 is made of a material with high light reflectivity. By covering the first coating member 11, the light diffusion member 12, the wavelength conversion member 13, and the light-emitting element 14 with the second coating member 15, light leakage from these members is reduced, and light can be efficiently extracted from the light-emitting surface 10. This increases the light extraction efficiency of the light-emitting section 1A. For example, the second coating member 15 can be made of a resin material containing a light-reflective substance such as a white pigment. Alternatively, the second coating member 15 may be a light-reflective member made of an inorganic material containing, for example, boron nitride or alkali metal silicate. In this case, it may further contain titanium oxide or zirconium oxide.

[0055] Examples of light-reflecting substances included in the second coating member 15 include titanium dioxide, zinc oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, aluminum oxide, zirconium oxide, silicon oxide, etc. It is preferable to use one of these alone or two or more of these in combination. Furthermore, it is preferable to use a resin material mainly composed of thermosetting resins such as epoxy resin, epoxy-modified resin, silicone resin, silicone-modified resin, and phenolic resin as the base material. The second coating member 15 may also be composed of a material that is transparent to or absorbs visible light as needed. A material that absorbs light includes, for example, carbon black.

[0056] The first covering member 11 is a member that covers at least a portion of the upper surface of the light diffusing member 12, and is, for example, a substantially rectangular member when viewed from above. By arranging the first covering member 11, the upper surface of the light diffusing member 12 can be protected from external forces, etc. In the example shown in Figure 5, the upper surface of the first covering member 11 is exposed from the second covering member 15 and is the light-emitting surface 10. The first covering member 11 can be made of the same material as the material exemplified for the second covering member 15.

[0057] The base body 18 is a component made primarily of ceramics. Examples of ceramics include aluminum nitride, silicon nitride, aluminum oxide, and silicon carbide. In this embodiment, the light source 1 is mounted on the substrate 3 via the base body 18, thereby improving the heat dissipation of the light-emitting module 100.

[0058] In the first example of the light source 1, the thickness of the first coating member 11 is 1 μm or more and 100 μm or less, the thickness of the light diffusion member 12 is 10 μm or more and 200 μm or less, the thickness of the wavelength conversion member 13 is 20 μm or more and 200 μm or less, the thickness of the light-emitting element 14 is 5 μm or more and 50 μm or less, and the thickness of the substrate 18 is 150 μm or more and 1000 μm or less. In addition, the spacing Gp between adjacent light-emitting elements 14 is 5 μm or more and 100 μm or less.

[0059] In this embodiment, the light-emitting element 14 is manufactured by a laser lift-off (LLO) processing method. Here, the LLO processing method is a processing method in which a high-power laser is irradiated onto a workpiece, heating and decomposing the processed surface of the workpiece, thereby separating one or more components into two or more components with the processed surface as the boundary. For example, the manufacturing process of the light-emitting element 14 includes a step of separating the growth substrate of the light-emitting element from the nitride-based semiconductor by the LLO processing method. By manufacturing a light-emitting element 14 from which the growth substrate such as sapphire has been removed by the LLO processing method, the thickness of the light-emitting element 14 is reduced, and the light generated by the nitride-based semiconductor of the light-emitting element 14 and mainly absorbed by the growth substrate can be effectively utilized. In other words, the amount of light absorbed within the light-emitting element 14 is reduced, and the light extraction efficiency is improved. As a result, the light emission output from the light-emitting element 14 is increased. Note that the light-emitting module 100 may use a light source 1 that does not have a substrate 18. In this case, the LLO processing method may be omitted, and a light-emitting element 14 equipped with a growth substrate may be used. In the light source 1, which does not have a base 18, the electrodes 16 of the light-emitting element 14 and the wiring of the substrate 3 are electrically connected via conductive materials such as bumps and solder.

[0060] Next, a second example of the light source 1 will be described in detail with reference to Figures 5 and 6. Note that names and reference numerals identical to those used in the previously described embodiments indicate the same or identical components or configurations, and detailed explanations will be omitted as appropriate. This also applies to the following modifications, embodiments, and examples.

[0061] (Second example of light source 1) As shown in Figures 5 and 6, the light source 1 includes a light-emitting section 1A, which includes a first light-emitting section 1A-1 and a second light-emitting section 1A-2. The light source 1 has one first light-emitting section 1A-1, one second light-emitting section 1A-2, and eight third light-emitting sections 1A-3. The first light-emitting section 1A-1 and the second light-emitting sections 1A-2 are arranged in the X direction in the central part 1B of the light source 1 when viewed from above. For ease of understanding, if the area occupied by one first light-emitting section 1A-1 and one second light-emitting section 1A-2 is equivalent to the area occupied by one third light-emitting section 1A-3 when viewed from above, the example shown in Figure 5 can be considered as a 3x3 matrix as a whole. In the following description, the example of the arrangement of light-emitting sections 1A shown in Figure 5 may be considered as a 3x3 matrix as a whole. The third light-emitting sections 1A-3 are arranged vertically or horizontally when viewed from above. In the example shown in Figure 5, three third light-emitting units 1A-3 are aligned in the first and third rows in the X direction of a 3x3 matrix. Three third light-emitting units 1A-3 are also aligned in the first and third columns in the Y direction. The central unit 1B is located at the position corresponding to the second row and second column of the 3x3 matrix. Note that in Figure 5, to avoid complexity, only the third light-emitting unit 1A-3 located in the second row and first column is labeled with a numeral.

[0062] In the example shown in Figure 6, the third light-emitting section 1A-3 includes a light-emitting element 14 and a wavelength conversion member 13 positioned above the light-emitting element 14. The third light-emitting section 1A-3 also includes a light-diffusing member 12 positioned above the wavelength conversion member 13 and a second covering member 15 that covers the sides of the light-diffusing member 12, the wavelength conversion member 13, and the light-emitting element 14, respectively.

[0063] The light-emitting element 14 has at least one pair of positive and negative electrodes 16 on the side opposite to the side facing the wavelength conversion member 13, i.e., the bottom surface. The light-emitting element 14 is positioned on the upper surface 31 of the substrate 3 via the electrodes 16. The sides of the electrodes 16 and the bottom surface of the light-emitting element 14 are covered by the second covering member 15.

[0064] The light source 1 and the substrate 3 are electrically connected by connecting the electrodes 16 of the light-emitting element 14 to the wiring of the substrate 3 using conductive materials such as bumps and solder. The configuration and size of the wiring on the substrate 3 are set according to the configuration and size of the electrodes 16 of the light-emitting element 14.

[0065] The second covering member 15 integrally holds a plurality of light-diffusing members 12, a plurality of wavelength-converting members 13, and a plurality of light-emitting elements 14. In the example shown in Figure 6, the second covering member 15 is positioned on the sides of the light-diffusing members 12, wavelength-converting members 13, and light-emitting elements 14. The second covering member 15 is positioned between adjacent first covering members 11, between adjacent light-diffusing members 12, between adjacent wavelength-converting members 13, and between adjacent light-emitting elements 14. The second covering member 15 integrally holds the light-diffusing members 12, wavelength-converting members 13, and light-emitting elements 14 provided by the first light-emitting section 1A-1, the second light-emitting section 1A-2, and the 24 third light-emitting sections 1A-3. The upper surface of the second covering member 15 constitutes a part of the upper surface of the light source 1. The second covering member 15 also includes two long sides and two short sides, and these four sides constitute the substantially rectangular outer shape of the light source 1 when viewed from above.

[0066] In the second example of light source 1, the thickness of the light diffusing member 12 is 110 μm, the thickness of the wavelength conversion member 13 is 60 μm, and the thickness of the light-emitting element 14 is 250 μm. The distance Gp between adjacent light-emitting elements 14 is 20 μm.

[0067] (Lens 2) Lens 2 is composed of at least one resin material such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, or glass material that is light-transmitting to light emitted from light source 1. The light-transmitting portion 20 and the first support portion 25 are connected to each other as a single unit. However, the light-transmitting portion 20 and the first support portion 25 may be separate units. Also, the first support portion 25 may be omitted, and the light-transmitting portion 20 may also perform the function of the first support portion 25. Note that light transmittance in lens 2 refers to the property of being able to transmit 60% or more of the light from light source 1.

[0068] In the example shown in Figure 1, the light-transmitting portion 20 is approximately circular when viewed from above. However, the light-transmitting portion 20 is not limited to being approximately circular when viewed from above, and may be approximately rectangular, approximately elliptical, or approximately polygonal, etc. Also, the light-transmitting portion 20 may be rotationally symmetric when viewed from above. Considering that the imaging range of a typical imaging device is approximately rectangular, it is preferable that the light-transmitting portion 20 is 4-fold rotationally symmetric or 2-fold rotationally symmetric when viewed from above.

[0069] In the example shown in Figure 2, the light incident surface 21 is a convex surface that is convex toward the side where the light source 1 is located. The light emission surface 22 is a convex surface that is convex toward the opposite side from where the light source 1 is located. The light-transmitting portion 20 is a biconvex single lens. The light emission surface 22 is spherical. However, the light-transmitting portion 20 may be a meniscus single lens. The light emission surface 22 is not limited to a spherical surface and may be aspherical.

[0070] In the example shown in Figure 1, the first support portion 25 is a cylindrical portion that supports the translucent portion 20 from the outside when viewed from above. Furthermore, the first support portion 25 is a continuous circular ring when viewed from above. However, the first support portion 25 is not limited to a circular ring when viewed from above, but may be a rectangular ring or a polygonal ring. In addition, the first support portion 25 may consist of multiple first support portions 25, and the multiple first support portions 25 may be arranged in a ring when viewed from above.

[0071] (Circuit board 3) The substrate 3 is a substrate equipped with wiring on which the light source 1 can be mounted. In the examples shown in Figures 1 and 2, the substrate 3 is a plate-shaped member that is approximately circular when viewed from above. The substrate 3 may be approximately rectangular, approximately elliptical, or approximately polygonal when viewed from above. In addition, other electronic components besides the light source 1 may be placed on the substrate 3. These electronic components may be Zener diodes, thermistors, capacitors, light receiving sensors, etc.

[0072] The substrate 3 preferably uses an insulating material as its base material, and it is preferable to use a material that does not easily transmit light emitted from the light source 1 or light incident on the inside of the light-emitting module 100 from the outside. Furthermore, it is preferable to use a material that has a certain strength for the substrate 3. Specifically, the substrate 3 can be constructed using ceramics such as alumina, aluminum nitride, mullite, and silicon nitride, or resins such as phenolic resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), polyphthalamide, and polyester resin as base materials.

[0073] The wiring on substrate 3 can be made of at least one of the following materials: copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, or alloys thereof. In addition, a layer of silver, platinum, aluminum, rhodium, gold, or alloys thereof may be provided on the surface of the wiring on substrate 3, from the viewpoint of at least one of the wettability of the conductive material and the light reflectivity of the wiring.

[0074] <Behavior of light emitted from light-emitting module 100, and illuminance of the irradiated light> Next, the behavior of the light emitted from the light-emitting module 100 and the illuminance of the irradiated light will be explained with reference to Figures 7 to 10. Figure 7 is a diagram showing the behavior of the light emitted from the first light-emitting section 1A-1 and the second light-emitting section 1A-2 of the light source 1 of the light-emitting module 100. Figure 8 is a diagram showing the behavior of the light emitted from the third light-emitting section 1A-3 of the light source 1. Figure 9 is a diagram showing the illuminance on the irradiated surface when only the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are illuminated. Figure 10 is a diagram showing the illuminance on the irradiated surface when all light-emitting sections 1A of the light source 1 are illuminated.

[0075] In Figure 7, the solid arrows indicating light L11 and light L12 represent a portion of the light emitted from the first light-emitting section 1A-1 of the light source 1. Light L11 is emitted from the first light-emitting section 1A-1 and enters the interior of the lens 2 through the inner region 24 of the first convex portion 23 on the light incident surface 21. The light L11 that enters the interior of the lens 2 exits the lens 2 through the light-emitting surface 22 and irradiates the illumination surface S. In the example shown in Figure 7, the illumination surface S is a plane perpendicular to the optical axis 2C of the lens 2. Light L12 is emitted from the first light-emitting section 1A-1 and enters the interior of the lens 2 through the first convex portion 23 on the light incident surface 21. The light L12 that enters the interior of the lens 2 is reflected by the first light-reflecting surface 230 of the first convex portion 23, then exits the lens 2 through the light-emitting surface 22 and irradiates the illumination surface S.

[0076] On the other hand, the light L21 and light L22 indicated by the dashed arrows represent a portion of the light emitted from the second light-emitting section 1A-2 of the light source 1. Light L21 is emitted from the second light-emitting section 1A-2 and enters the interior of the lens 2 through the inner region 24 of the first convex portion 23 on the light incident surface 21. The light L21 that enters the interior of the lens 2 exits the lens 2 through the light-emitting surface 22 and irradiates the illumination surface S. Light L22 is emitted from the second light-emitting section 1A-2 and enters the interior of the lens 2 through the first convex portion 23 on the light incident surface 21. The light L22 that enters the interior of the lens 2 is reflected by the first light-reflecting surface 230 of the first convex portion 23, then exits the lens 2 through the light-emitting surface 22 and irradiates the illumination surface S.

[0077] Light L12 of the first chromaticity and light L22 of the second chromaticity are reflected by the first light reflection surface 230, causing them to travel toward the center of the lens 2 when viewed from above and to exit from the light emission surface 22. Light L11 and light L21 travel almost in a straight line near the optical axis 2C of the lens 2, along the optical axis 2C. In the space between the light emission surface 22 and the illumination surface S, the light L11 and light L12 of the first chromaticity and the light L21 and light L22 of the second chromaticity overlap and mix. As a result, color-tuned light is obtained on the illumination surface S. In addition, light L11 and light L21 travel almost in a straight line, while light L12 and light L22 travel toward the center of the lens 2 when viewed from above. If only light, such as light L11 and light L21, travels almost in a straight line toward the illumination surface S along the optical axis 2C of lens 2, the amount of overlapping light on the illumination surface S is small, resulting in a small degree of color mixing and large color unevenness. In contrast, by including light, such as light L12 and light L22, which travel toward the center of lens 2 when viewed from above and intersect with each other before reaching the illumination surface S, the amount of overlapping light on the illumination surface S increases, resulting in a large degree of color mixing and small color unevenness. Furthermore, in the light-emitting module 100, when only the first light-emitting part 1A-1 and the second light-emitting part 1A-2 of the 26 light-emitting parts 1A of the light source 1 are emitted, light L11, light L21, light L12, and light L22 travel along the optical axis 2C of lens 2 (without the light distribution of each light spreading), so a narrow-angle light distribution illumination is obtained.

[0078] In Figure 8, the dashed arrows indicating light L31 and light L32 represent a portion of the light emitted from the third light-emitting section 1A-3 of the light source 1. Light L31 is emitted from the third light-emitting section 1A-3 and enters the interior of the lens 2 through the first convex section 23 on the light incident surface 21. After being reflected by the first light-reflecting surface 230 of the first convex section 23, light L31 exits the lens 2 through the light-emitting surface 22 and irradiates the illumination surface S. Light L32 is emitted from the third light-emitting section 1A-3 and enters the interior of the lens 2 through the area of ​​the light incident surface 21 other than the first convex section 23 and the inner region 24. Light L32 exits the lens 2 through the light-emitting surface 22 and irradiates the illumination surface S.

[0079] Light L31 is reflected by the first light reflection surface 230, causing it to travel toward the center of the lens 2 in a top view and exit from the light emission surface 22. On the other hand, light L32 passes through the area of ​​the light incident surface 21 other than the first convex portion 23 and the inner region 24, so it spreads out in a direction away from the optical axis 2C of the lens 2 and exits from the light emission surface 22. As light L32 spreads, when the light-emitting portion 1A, which includes at least the third light-emitting portion 1A-3 of the light source 1, is illuminated, a wide-angle light distribution illumination is obtained.

[0080] Figure 9 shows the simulation results of the illuminance on the illuminated surface S of the light emitted from the light-emitting module 100 when only the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 of the 26 light-emitting units 1A of the light source 1 are illuminated. Figure 10 shows the simulation results of the illuminance on the illuminated surface S of the light emitted from the light-emitting module 100 when all 26 light-emitting units 1A of the light source 1 are illuminated.

[0081] As shown in Figures 9 and 10, when only the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are illuminated, a narrow-angle beam of illumination is obtained compared to when all 26 light-emitting sections 1A of the light source 1 are illuminated. Furthermore, this illumination is color-tuned light, achieved by mixing light of the first chromaticity and light of the second chromaticity.

[0082] In this embodiment, the beam angle of light from at least one third light-emitting unit 1A-3 reflected by the first light-reflecting surface 230 is wider than the beam angle of light from the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 reflected by the first light-reflecting surface 230. This makes it possible to control the beam angle of light emitted from the light-emitting module 100 by individually controlling the light emission from the multiple light-emitting units 1A of the light source 1.

[0083] In this embodiment, the light of the first chromaticity and the light of the second chromaticity reflected by the first light-reflecting surface 230 travel toward the center of the lens 2 when viewed from above. This makes it easier for the light of the first chromaticity and the light of the second chromaticity to mix on the illuminated surface. As a result, color-matched light with reduced color unevenness is obtained.

[0084] <Relationship between the distance from the optical axis 2C to the annular first protrusion 23 and the characteristics of the irradiated light> Next, with reference to Figures 11 and 12, the relationship between the distance from the optical axis 2C to the annular first protrusion 23 in the lens 2 of the light-emitting module 100 and the illumination light characteristics will be explained. Figure 11 is a diagram illustrating the distance from the optical axis 2C to the annular first protrusion 23 in the lens 2. Figure 12 is a diagram showing an example of the relationship between the distance from the optical axis 2C to the annular first protrusion 23 in the lens 2 and the optical characteristics.

[0085] As shown in Figure 11, distance A is the shortest distance between the lowest part 23L of the annular first protrusion 23 and the optical axis 2C in a cross-section including the optical axis 2C. On the other hand, distance B is the shortest distance between the outer edge 23E of the annular first protrusion 23 and the optical axis 2C in a cross-section including the optical axis 2C. Figure 12 shows the simulation results of the color unevenness Δu'v' of the light emitted from the light-emitting module 100, the illuminance obtained on the illuminated surface, and the light distribution when only the first light-emitting part 1A-1 and the second light-emitting part 1A-2 of the light-emitting module 100 are illuminated and distances A and B are varied. In the example shown in Figure 12, 0.36 mm was used as the reference for distance A and 0.47 mm was used as the reference for distance B. Also, in the examples shown in Figures 12 and 13, the distance from the light-emitting surface 10 of the light source 1 to the illuminated surface was set to 150 mm.

[0086] Δu'v' is a value calculated to evaluate the color unevenness of the light emitted from the light-emitting module 100, and a smaller value of Δu'v' means less color unevenness. The following steps (1) to (5) were performed in order to calculate Δu'v'. (1) The values ​​of u' and v' were determined for 21,209 measurement points within a rectangular irradiation area on the irradiation surface. The 21,209 measurement points were taken as the center of each cell in a total of 21,209 cells, where the irradiation area was divided into 167 cells vertically and 127 cells horizontally, with each cell being a 2.5 mm × 2.5 mm square. (2) The average value of all measurement points.<u'> and<v'> (3) For each measurement point, Δu n =|u' n -<u'> | and Δv n =|v'n -<v'> Find |, (Δu' n ,Δv' n (4) Based on the following equation (I), the distance between Δu' and Δv' (Δu'v') n We sought (5)(Δu'v'). n Let Δu'v' be the maximum value among the possible values.

[0087]

number

[0088] The light distribution shown in Figure 12 is a graph representing the peak luminous intensity value in the 0° direction, where the direction passing through the center of the illumination area and parallel to the X-axis is defined as the 0° direction on the illumination surface illuminated by the light-emitting module 100. A narrower peak width indicates a narrow-angle light distribution, while a wider peak value indicates a wide-angle light distribution.

[0089] As shown in Figure 12, the color unevenness Δu'v' remained almost unchanged or decreased even when distances A and B were longer than the standard. Furthermore, the color unevenness Δu'v' increased as distances A and B became shorter than the standard. Also, as distances A and B increased beyond the standard, the light distribution became wider and the illuminance decreased. From the above, it was found that the most preferable condition for adjusting the color of the illuminated light and achieving a narrow light distribution when only the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 are emitted is when distance A is 0.36 mm and distance B is 0.47 mm. If only the suitability of adjusting the color of the illuminated light is considered, it is preferable that distance A is longer than 0.36 mm and distance B is longer than 0.47 mm, and it is more preferable that distance A is 0.51 mm or more and distance B is 0.62 mm or more.

[0090] <Relationship between the shape of the annular first protrusion 23 and the inner region 24 and the characteristics of the irradiated light> Next, with reference to Figures 13 and 14, the relationship between the shape of the annular first convex portion 23 and the inner region 24 of the lens 2 of the light-emitting module 100 and the illumination light characteristics will be explained. Figure 13 is a diagram showing an example of the relationship between the shape of the annular first convex portion 23 and the inner region 24 of the lens 2 of the light-emitting module 100 and the optical characteristics in samples No. 1 to 9. Figure 14 is a diagram showing the illuminance on the illumination surface of the light emitted by the light source. In samples No. 1 to 9, only the first light-emitting portion 1A-1 and the second light-emitting portion 1A-2 of the light-emitting module 100 were illuminated.

[0091] In Figure 13, "Cross-sectional shape of the annular first convex portion and inner region" schematically represents the cross-sectional shape of the annular first convex portion 23 and inner region 24 in a single cross-section including the optical axis 2C of lens 2. "Radius of curvature of inner region" represents the radius of curvature of the inner region 24, where the radius of curvature is a negative value when the inner region 24 is a concave surface that is recessed on the side opposite to where the light source 1 is located, and a positive value when the radius of curvature is a convex surface that is convex on the side where the light source 1 is located. "Color unevenness (Δu'v')" is the simulation result of color unevenness Δu'v'. "FOV" is Field of View. Reference Example 1 shows the relationship between the lens shape of the light-emitting module and the illumination light characteristics when a light-emitting module with the same configuration as light-emitting module 100 is used, except that the lens does not have an annular first convex portion and inner region. In Reference Example 1, as with Samples No. 1 to 9, only the first and second light-emitting parts of the light-emitting module were illuminated.

[0092] Here, with reference to Figure 14, the FOV evaluation item will be explained. The irradiation angle is the angle at which the illuminance on the irradiation area SP (in other words, on the XY plane of the irradiation area SP) becomes 10% relative to the maximum illuminance of 100%. For example, as shown in Figure 14, when light is shone onto the irradiation area SP from a light source PL located at a distance h in the vertical direction (Z-axis direction) from the center position O of the irradiation area SP, the maximum illuminance is obtained at the center position O of the irradiation area. When the illuminance at the center position O is taken as 100%, the position on the irradiation area SP where the illuminance becomes 10% is defined as the outer edge position t. In this embodiment, items (2) to (4) were evaluated by calculating the irradiation angle θ determined from the positional relationship between the two outer edge positions t and the light source PL, and a smaller irradiation angle θ was considered preferable.

[0093] For FOV(0°), in the illumination area SP, the position where the illuminance is 10% in the direction parallel to the X-axis (0° direction) passing through the center position O is defined as outer edge position t1, and the distance T between two outer edge positions t1 is defined as T1. For FOV(45°), in the illumination area SP, the position where the illuminance is 10% in the direction inclined at 45° with respect to the X-axis (45° direction) passing through the center position O is defined as outer edge position t2, and the distance T between two outer edge positions t2 is defined as T2. For FOV(90°), in the illumination area SP, the position where the illuminance is 10% in the direction perpendicular to the X-axis (90° direction or direction parallel to the Y-axis) passing through the center position O is defined as outer edge position t3, and the distance T between two outer edge positions t3 is defined as T3. In this embodiment, for FOV(0 degrees) and FOV(90 degrees), the distance h = 150 mm was used as an example, and the distances T(T1 and T3) were substituted into the following equation (II) to calculate the irradiation angle θ of the narrow-angle beam.

[0094]

number

[0095] As shown in Figure 13, in all samples No. 1 to 9, an effect of reducing color unevenness was obtained compared to Reference Example 1. This is because, in samples No. 1 to 9, the light of the first chromaticity emitted by the first light-emitting part 1A-1 and the light of the second chromaticity emitted by the second light-emitting part 1A-2 were reflected and focused by the first light-reflecting surface 230 of the annular first convex part 23, and as viewed from above, they propagated toward the optical axis 2C of the lens 2, resulting in a greater absolute amount of light overlapping on the illuminated surface than in Reference Example 1. Furthermore, in samples No. 1 to 9, the cross-sectional shape and radius of curvature of the inner region 24 did not have much effect on color unevenness. In other words, it was found that the effect of the annular first convex part 23 had a greater influence on the effect of reducing color unevenness than the radius of curvature of the inner region 24 and whether the inner region 24 is concave or convex. Therefore, as long as the lens 2 has at least the annular first convex part 23, the cross-sectional shape and radius of curvature of the inner region 24 are not particularly limited. Furthermore, in all samples No. 1 to 9, the illumination angle of the narrow-angle beam was maintained at the same level as in Reference Example 1.

[0096] <Variation> Next, a modified light-emitting module according to the first embodiment will be described with reference to Figures 15 to 17. Figure 15 is a schematic top view of a modified light-emitting module 100a according to the first embodiment. Figure 16 is a schematic cross-sectional view taken along the line XVI-XVI in Figure 15. Figure 17 is a diagram showing an example of color unevenness Δu'v' when the light emission pattern of the light source 1 of the light-emitting module 100a is changed.

[0097] In the light-emitting module 100a according to this modified example, the light-emitting region 1C of the light source 1 is rectangular when viewed from above. The lens 2 further includes an annular second protrusion 26 outside the annular first protrusion 23. The annular second protrusion 26 overlaps with at least one of the four corners 1K of the light-emitting region 1C. These points differ from the light-emitting module 100 according to the first embodiment.

[0098] In the example shown in Figures 15 and 16, the lens 2 further includes an annular third protrusion 27 between the annular first protrusion 23 and the annular second protrusion 26 when viewed from above. The annular second protrusion 26 includes a second light-reflecting surface 260. The annular third protrusion 27 includes a third light-reflecting surface 270. The annular second protrusion 26 also overlaps each of the four corners 1K of the light-emitting region 1C when viewed from above. The annular third protrusion 27 overlaps each of the four light-emitting parts 1A located between the central part 1B of the light source 1 and the four corners 1K, among the eight light-emitting parts 1A located around the central part 1B of the light source 1 when viewed from above.

[0099] The light emitted from the light-emitting part 1A becomes more difficult to control as the light-emitting part 1A moves away from the optical axis 2C of the lens 2. The four corners 1K of the light-emitting region 1C are further away from the optical axis 2C of the lens 2 than the center 1CC of the light-emitting region 1C. Therefore, much of the light emitted from the four corners 1K of the light-emitting region 1C is difficult to control by the lens 2 and tends to become stray light. In this modified example, in a top view, an annular second protrusion 26 is placed outside the annular first protrusion 23, and the light emitted from the four corners 1K of the light-emitting region 1C is controlled by the annular second protrusion 26. This reduces stray light. In addition, the annular third protrusion 27 focuses the light emitted from the eight light-emitting parts 1A located around the central part 1B of the light source 1 (in other words, light-emitting parts 1A adjacent to at least one of the first light-emitting part 1A-1 and the second light-emitting part 1A-2 located in the central part 1B) toward the optical axis 2C of the lens 2.

[0100] Here, the color unevenness Δu'v' was evaluated for samples No. 10 to 15, in which the light emission pattern of the light source 1 of the light-emitting module 100a was changed. Figure 17 shows the color unevenness Δu'v' for each of the various light emission patterns of the light source 1. In the light emission patterns of No. 10 to 15 of the embodiment shown in Figure 17, the first light-emitting part 1A-1 is shown as a dark dot pattern, the second light-emitting part 1A-2 is shown as a light dot pattern, and the third light-emitting part 1A-3 is shown as white. Also, in Figure 17, the first light-emitting part 1A-1 and the second light-emitting part 1A-2 are illuminated, while the third light-emitting part 1A-3 is not illuminated. Note that in Figure 17, in order to avoid making the figure complicated, the reference numerals for the first light-emitting part 1A-1, the second light-emitting part 1A-2, and the third light-emitting part 1A-3 are only attached to the light source 1 related to sample No. 10.

[0101] The light source 1 for sample No. 10 has one first light-emitting unit 1A-1 and one second light-emitting unit 1A-2, and each of the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 emits light. The light source 1 for sample No. 11 has five first light-emitting units 1A-1 and five second light-emitting units 1A-2, and each of the five first light-emitting units 1A-1 and the five second light-emitting units 1A-2 emits light. The light source 1 for sample No. 12 has thirteen first light-emitting units 1A-1 and thirteen second light-emitting units 1A-2, and each of the thirteen first light-emitting units 1A-1 and the thirteen second light-emitting units 1A-2 emit light. The light source 1 of sample No. 13 has two first light-emitting sections 1A-1 positioned diagonally at two of the four corners when viewed from above, and two second light-emitting sections 1A-2 positioned diagonally at the other two corners, and each of the two first light-emitting sections 1A-1 and the two second light-emitting sections 1A-2 emits light.

[0102] In the light source 1 of Sample No. 14, a first light-emitting unit 1A-1 and a second light-emitting unit 1A-2 are arranged at each of the four corners of the light-emitting region 1C. In the example shown in Figure 17, two first light-emitting units 1A-1 are arranged diagonally at each of the four corners of the light-emitting region 1C. Also, two second light-emitting units 1A-2 are arranged diagonally at each of the four corners of the light-emitting region 1C. Therefore, the light source 1 of Sample No. 14 has eight first light-emitting units 1A-1 and eight second light-emitting units 1A-2, and emits light from eight first light-emitting units 1A-1 and eight second light-emitting units 1A-2, respectively.

[0103] The light source 1 for sample No. 15 has 17 first light-emitting units 1A-1 and 15 second light-emitting units 1A-2, and each of the 17 first light-emitting units 1A-1 and 15 second light-emitting units 1A-2 emits light.

[0104] As shown in Figure 17, it was found that the color unevenness Δu'v' could be reduced and the color could be toned in each of the samples from No. 10 to No. 15. In sample No. 11, the annular third protrusion 27 allowed the light of different chromaticities emitted from the five first light-emitting units 1A-1 and the five second light-emitting units 1A-2 to be toned while reducing the color unevenness Δu'v'. In particular, the color unevenness Δu'v' was reduced the most in sample No. 14. From this, it was found that the color unevenness Δu'v' could be further reduced and the color could be toned by including the first light-emitting units 1A-1 and the second light-emitting units 1A-2, which have different chromaticities from each other, in the four corners of the light-emitting region 1C, and having the annular second protrusion 26 overlap the four corners 1K of the light-emitting region 1C (in other words, the first light-emitting units 1A-1 and the second light-emitting units 1A-2 are arranged in each of the four corners of the light-emitting region 1C). In Sample No. 14, the first light-emitting section 1A-1 and the second light-emitting section 1A-2 are arranged at each of the four corners of the light-emitting region 1C. However, the first light-emitting section 1A-1 and the second light-emitting section 1A-2 may be arranged at at least one of the four corners of the light-emitting region 1C.

[0105] [Second Embodiment] Next, a light-emitting module according to the second embodiment will be described with reference to Figures 18 and 19. Figure 18 is a schematic top view of the light-emitting module 100b according to the second embodiment. Figure 19 is a schematic cross-sectional view taken along the line XIX-XIX in Figure 18.

[0106] As shown in Figures 18 and 19, the light-emitting module 100b according to this embodiment further comprises a light-transmitting member 5 having a cover portion 51 including a light-diffusing portion 511, and differs from the light-emitting module 100 according to the first embodiment in that the light-diffusing portion 511 is arranged to cover the light-emitting surface 22 of the lens 2.

[0107] In the example shown in Figure 18, the light-emitting module 100b is approximately circular in top view. In top view, the outer shape of the translucent member 5 is the same as the outer shape of the light-emitting module 100b. However, the light-emitting module 100b and the translucent member 5 are not limited to being approximately circular in top view, but may have other shapes such as approximately elliptical, approximately rectangular, or approximately polygonal.

[0108] In the example shown in Figure 19, the light-transmitting member 5 further has a second support portion 52 that supports the cover portion 51. The light-emitting module 100b further has a second adhesive member 6 that is positioned between the outer surface 32 of the substrate 3 and the inner surface 520 of the second support portion 52 of the light-transmitting member 5. The cover portion 51 faces the light-emitting surface 22 of the lens 2.

[0109] Because the light-emitting module 100b has a light-transmitting member 5, the light distribution can be controlled using the light-transmitting portion 20 of the lens 2 and the cover portion 51 of the light-transmitting member 5, thus increasing the degree of freedom in light distribution control.

[0110] (Translucent member 5) The light-transmitting member 5 is positioned to cover the lens 2. The cover portion 51 transmits light that has been emitted from the light source 1 and passed through the lens 2. The light-transmitting member 5 is composed of at least one resin material such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, or glass material that is light-transmitting to light emitted from the light source 1. Preferably, the light-transmitting properties of the cover portion 51 are such that it can transmit 60% or more of the light from the light source 1.

[0111] In the example shown in Figure 19, the cover portion 51 and the second support portion 52 are a single integrated component without the use of adhesive. From another perspective, the cover portion 51 is connected to the second support portion 52. However, the cover portion 51 and the second support portion 52 may be separate components joined together by adhesive.

[0112] In the examples shown in Figures 18 and 19, the lens 2 has a light incident surface 21 (hereinafter sometimes referred to as the first light incident surface 21 in this embodiment) and a light emission surface 22 (hereinafter sometimes referred to as the first light emission surface 22 in this embodiment), and the cover portion 51 of the light-transmitting member 5 has a second light incident surface 510 facing the first light emission surface 22 of the lens 2, and a second light emission surface 530 on the side of the second light incident surface 510 opposite to the side where the light source 1 is located. The second light incident surface 510 is provided with a light diffusion portion 511. The light diffusion portion 511 includes a plurality of concentric protrusions centered on the central axis 51C of the cover portion 51. The central axis 51C of the cover portion 51 coincides with the optical axis 2C of the lens 2, the central axis 23C of the annular first convex portion 23, the center 1CC of the light-emitting region 1C of the light source 1, the center 24C of the inner region, and the center 1BC of the central portion 1B of the light source 1 when viewed from above. The light-diffusing portion 511 may be a Fresnel lens having a Fresnel shape.

[0113] The second support portion 52 supports the cover portion 51 so that the cover portion 51 is positioned above the light-transmitting portion 20. The second support portion 52 is a circular, annular portion of the light-transmitting member 5 when viewed from above. The second support portion 52 is a cylindrical portion that extends downward on the outside of the substrate 3 and the outside of the lens 2. The second support portion 52 is positioned such that a part of its inner surface 520 faces the outer surface 32 of the substrate 3. The substrate 3 and the light-transmitting member 5 are fixed together by placing the second adhesive member 6 between the outer surface 32 of the substrate 3 and the inner surface 520 of the second support portion 52 of the light-transmitting member 5.

[0114] [Examples and Reference Examples] Examples and reference examples are described below. However, this disclosure is not limited in any way by these examples.

[0115] In the examples and reference examples, the following items (1) and (2) were evaluated for the light-emitting modules related to Example 1, Example 2, and Reference Example 2, respectively. (1) Central illuminance (lux) on a diffuser plate 1 m away from the second light-emitting surface of the light-emitting module. (2) Color unevenness Δu'v'

[0116] For item (1) above, the central illuminance (lux) of narrow-angle, wide-angle, and ultra-wide-angle light distribution was evaluated. In the light-emitting modules of each of Example 1, Example 2, and Reference Example 2, the narrow-angle mode for emitting narrow-angle light distribution was specified as either mode (A), in which some of the 24 third light-emitting units 1A-3 and the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 are emitted, or mode (B), in which the 24 third light-emitting units 1A-3 are not emitted, and only the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 are emitted. Furthermore, in the light-emitting modules for each of Example 1, Example 2, and Reference Example 2, the wide-angle mode for emitting wide-angle or ultra-wide-angle light distribution was set to one of the following specifications: (a) a mode in which only some of the 24 third light-emitting units 1A-3 are illuminated, (b) a mode in which all 24 third light-emitting units 1A-3 are illuminated but the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 are not illuminated, or (c) a mode in which all 24 third light-emitting units 1A-3 and the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 are illuminated. The specifications of the light-emitting modules for each of Example 1, Example 2, and Reference Example 2 are shown in Table 1. In Example 2, the current values ​​applied to the 24 third light-emitting units 1A-3 were different for wide-angle and ultra-wide-angle light distribution.

[0117] For item (2) above, the color unevenness of the narrow-angle light emitted from the light-emitting module was evaluated by Δu'v' when the light-emitting module for each of Example 1, Example 2, and Reference Example 2 was used as a light source device for a flashlight. In the light-emitting modules for each of Example 1, Example 2, and Reference Example 2, the narrow-angle mode for emitting narrow-angle light was specified as mode (B) in which the 24 third light-emitting units 1A-3 were not illuminated, and the first light-emitting unit 1A-1 and the second light-emitting unit 1A-2 were illuminated.

[0118] [Table 1]

[0119] <Evaluation Results> Table 2 shows the evaluation results for the light-emitting modules for Example 1, Example 2, and Reference Example 2. The meanings of "◎", "〇", and "△" in Table 1 are as follows. Furthermore, the target value in item (1) refers to the illuminance that can provide sufficient light to the illuminated area in wide-angle mode or narrow-angle mode. The target value in item (2) refers to a value that minimizes color unevenness of the illuminated light when the light-emitting module is used as a light source device for a flashlight. "◎": Fully satisfies the target value. "〇": Meets the target value. "△": The target value is not met.

[0120] [Table 2]

[0121] (Example 1) In Example 1, the optical properties of the light-emitting module 100b according to the second embodiment were evaluated. The materials of the lens 2 and the light-transmitting member 5 of the light-emitting module 100b were polycarbonate resin. In Example 1, the illuminance for narrow-angle light distribution, wide-angle light distribution, and ultra-wide-angle light distribution were all "〇". The color unevenness Δu'v' was "◎". Therefore, in Example 1, all items satisfied the target values.

[0122] (Example 2) In Example 2, the optical characteristics of a light-emitting module with different light distribution characteristics were evaluated by changing the radius of curvature of the inner region 24 of lens 2 compared to Example 1 (in other words, changing the shape of the annular first convex portion 23 and the inner region 24 of lens 2). In Example 2, the illuminance for narrow-angle light distribution, wide-angle light distribution, and ultra-wide-angle light distribution were all "◎". The color unevenness Δu'v' was "〇". Therefore, in Example 2, all items satisfied the target values.

[0123] (Reference example 2) In Reference Example 2, the optical characteristics of a light-emitting module differed from the light-emitting module 100b according to the second embodiment only in that the lens 2 lacked an annular first protrusion 23 and an inner region 24. In Reference Example 2, the illuminance for narrow-angle distribution was "◎", the illuminance for wide-angle distribution was "〇", and the illuminance for ultra-wide-angle distribution was "△". The color unevenness Δu'v' was "△". Therefore, in Reference Example 2, the illuminance for ultra-wide-angle distribution and the color unevenness Δu'v' did not satisfy the target values.

[0124] The results in Table 2 show that Examples 1 and 2 are superior to Reference Example 2. Furthermore, Example 1 had a slight advantage over Example 2 in terms of color unevenness Δu'v', while Example 2 had a slight advantage over Example 1 in terms of illuminance for narrow-angle, wide-angle, and ultra-wide-angle light distribution.

[0125] 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.

[0126] The ordinal numbers, quantities, and other figures used in the description of the embodiments are all illustrative to specifically illustrate the technology of this disclosure, and this disclosure is not limited to the illustrative figures. Furthermore, the connection relationships between the components are illustrative to specifically illustrate the technology of this disclosure, and are not limited to the connection relationships that realize the functions of this disclosure.

[0127] The lenses and light-emitting modules of this disclosure are suitable for use in lighting, camera flashes, automotive headlights, and the like, as they allow for light distribution control. However, the lenses and light-emitting modules of this disclosure are not limited to these applications.

[0128] The aspects of this disclosure are, for example, as follows: <Item 1> A light-emitting module comprising a light source including a first light-emitting section that emits light of a first chromaticity and a second light-emitting section that emits light of a second chromaticity different from the first chromaticity, and a lens having a light-incident surface and a light-emitting surface, the light-incident surface having an annular first convex portion including a first light-reflecting surface, wherein the light-incident surface of the lens faces the light source, and the first light-emitting section and the second light-emitting section are located inside the first light-reflecting surface of the first convex portion in a top view. <Item 2> The light source further comprises a plurality of third light-emitting units, each emitting light of a third chromaticity different from the first chromaticity and the second chromaticity, and in a top view, the first light-emitting unit and the second light-emitting unit are located in the center of the light source, and the plurality of third light-emitting units are located around the center of the light source, and the first light-emitting unit, the second light-emitting unit and the third light-emitting unit are integrally formed, thus forming the light-emitting module described in <Item 1>. <Item 3> The light source further comprises a plurality of third light-emitting units, each emitting light of a third chromaticity different from the first chromaticity and the second chromaticity, the color temperature of the light of the third chromaticity being in the range between the color temperature of the light of the first chromaticity and the color temperature of the light of the second chromaticity, and in a top view, the first light-emitting unit and the second light-emitting unit are located in the center of the light source, and the plurality of third light-emitting units are located around the center of the light source, the light-emitting module according to <Item 1> or <Item 2>. <Clause 4> The light-emitting module according to <Clause 2> or <Clause 3> wherein the beam angle of light from at least one of the third light-emitting units reflected by the first light-reflecting surface is wider than the beam angle of light from the first light-emitting unit and the light from the second light-emitting unit reflected by the first light-reflecting surface. <Item 5> The light of the first chromaticity and the light of the second chromaticity reflected by the first light reflecting surface are, in a top view, traveling toward the center of the lens, and are light-emitting modules according to any one of <Item 1> to <Item 4>. <Item 6> The lens is a biconvex lens, and is a light-emitting module as described in any one of <Item 1> to <Item 5> above. <Item 7> The light-emitting module according to any one of <Item 1> to <Item 6>, wherein the inner region surrounded by the first convex portion on the light incident surface is a concave surface that is recessed in the direction opposite to the direction in which the light source is located. <Item 8> The optical axis of the lens is the light-emitting module described in any one of <Item 1> to <Item 7>, which, when viewed from above, coincides with the center of the inner region surrounded by the first protrusion. <Clause 9> The inner region surrounded by the first protrusion is the light-emitting module described in <Clause 8>, which, in a top view, coincides with the center of the central part of the light source. <Item 10> A light-emitting module according to any one of <Item 1> to <Item 9>, wherein the light-emitting output of the first light-emitting unit and the second light-emitting unit can be changed based on the output of the outside air temperature sensor. <Item 11> m and n are mutually distinct positive integers, the light source has a plurality of light-emitting units that are (m rows × m columns) as a whole, or (m rows × n columns) as a whole, and the plurality of light-emitting units, in a top view, include one or more first light-emitting units and one or more second light-emitting units in the center of the light source, the light-emitting module is as described in any one of <Item 1> to <Item 10>. <Item 12> In a top view, the light-emitting region of the light source is rectangular, and the first light-emitting unit and the second light-emitting unit are arranged at at least one of the four corners of the light-emitting region, wherein this is the light-emitting module according to any one of <Item 1> to <Item 11>. <Clause 13> In a top view, the lens further includes an annular second protrusion outside the first protrusion, the second protrusion overlapping at least one of the four corners of the light-emitting region, the light-emitting module as described in <Clause 12>. <Clause 14> The light source further comprises a plurality of third light-emitting units, each emitting light of a third chromaticity different from the first chromaticity and the second chromaticity, the color temperature of the light of the third chromaticity is in the range between the color temperature of the light of the first chromaticity and the color temperature of the light of the second chromaticity, and the color temperatures of the light of the first chromaticity, the color temperature of the light of the second chromaticity and the color temperature of the light of the third chromaticity are between Duv+0.0010 and Duv+0.015, the light-emitting module according to any one of <Clause 1> to <Clause 13>. <Item 15> The light-emitting module according to any one of <Item 1> to <Item 14> further comprises a light-transmitting member having a cover portion including a light-diffusing portion, wherein the light-diffusing portion is arranged to cover the light-emitting surface of the lens. [Explanation of symbols]

[0129] 1, 1D light source 1A Light-emitting part 1A-1 First light-emitting section 1A-2 Second light-emitting section 1A-3 Third light-emitting section 1B Central part 1BC center 1C emission region 1CC center 1K Corner 2 lenses 2C optical axis 3 circuit boards 4. First adhesive member 5 Translucent material 6. Second adhesive member 10 Light-emitting surface 11 First covering member 12 Light Diffusing Member 13 Wavelength conversion component 14 Light-emitting elements 15. Second covering member 16 electrodes 17. First wiring component 18 Base 19. Second wiring component 20 Translucent part 21 Light entrance surface 22 Light exit surface 23 First protrusion 23C center axis 24 Inner area 24C center 25 1st support part 25a Bottom side 26 Second protrusion 27 Third protrusion 31 Top side 32 External surface 51 Cover section 51C center axis 52 Second support part 100, 100a, 100b light-emitting modules 150 Resin components 230 1st light reflecting surface 260 Second light reflecting surface 270 Third light reflecting surface 510 Second light incident surface 511 Light Diffusion Section 520 Inner surface 530 Second light exit surface Distance between A and B d distance G Outer edge position Gp interval h distance L11, L12, L21, L22, L31, L32 light m distance O center position P point PL light source S Irradiation surface Wx1, Wx2, Wx3, Wy1, Wy2, Wy3 width θ Irradiation angle

Claims

1. A light source including a first light-emitting unit that emits light of a first chromaticity and a second light-emitting unit that emits light of a second chromaticity different from the first chromaticity, A lens having a light incident surface and a light exit surface, wherein the light incident surface has an annular first convex portion including a first light reflecting surface, The light incident surface of the lens faces the light source, The first light-emitting portion and the second light-emitting portion are located inside the first light-reflecting surface of the first protrusion in a top view, in a light-emitting module.

2. The light source further comprises a plurality of third light-emitting units, each emitting light of a third chromaticity different from the first chromaticity and the second chromaticity, In a top view, The first light-emitting part and the second light-emitting part are located in the central part of the light source, The plurality of third light-emitting parts are located around the central part of the light source, The light-emitting module according to claim 1, wherein the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are integrally formed.

3. The light source further comprises a plurality of third light-emitting units, each emitting light of a third chromaticity different from the first chromaticity and the second chromaticity, The color temperature of the light with the third chromaticity lies in the range between the color temperature of the light with the first chromaticity and the color temperature of the light with the second chromaticity. In a top view, The first light-emitting part and the second light-emitting part are located in the central part of the light source, The light-emitting module according to claim 1, wherein the plurality of third light-emitting units are located around the central part of the light source.

4. The light-emitting module according to claim 2 or 3, wherein the beam angle of light from at least one of the third light-emitting units reflected by the first light-reflecting surface is wider than the beam angle of light from the first light-emitting unit and the light from the second light-emitting unit reflected by the first light-reflecting surface.

5. The light-emitting module according to any one of claims 1 to 3, wherein the light of the first chromaticity and the light of the second chromaticity reflected by the first light-reflecting surface travel toward the center of the lens when viewed from above.

6. The light-emitting module according to any one of claims 1 to 3, wherein the lens is a biconvex lens.

7. The light-emitting module according to any one of claims 1 to 3, wherein the inner region surrounded by the first convex portion on the light incident surface is a concave surface that is recessed in the direction opposite to the direction in which the light source is located.

8. The light-emitting module according to any one of claims 1 to 3, wherein the optical axis of the lens coincides with the center of the inner region surrounded by the first protrusion when viewed from above.

9. The light-emitting module according to claim 8, wherein the inner region surrounded by the first protrusions coincides with the center of the central part of the light source when viewed from above.

10. The light-emitting module according to any one of claims 1 to 3, wherein the light-emitting output of the first light-emitting unit and the second light-emitting unit can be changed based on the output of an ambient temperature sensor.

11. m and n are distinct positive integers, The light source has multiple light-emitting sections, which together form an area of ​​(m rows × m columns) or an area of ​​(m rows × n columns). The light-emitting module according to any one of claims 1 to 3, wherein the plurality of light-emitting units include, in a top view, one or more first light-emitting units and one or more second light-emitting units in the central part of the light source.

12. In a top view, The light-emitting area of ​​the aforementioned light source is rectangular. The light-emitting module according to any one of claims 1 to 3, wherein the first light-emitting portion and the second light-emitting portion are arranged at at least one of the four corners of the light-emitting region.

13. In a top view, The lens further includes an annular second protrusion on the outside of the first protrusion, The light-emitting module according to claim 12, wherein the second protrusion overlaps with at least one of the four corners of the light-emitting region.

14. The light source further comprises a plurality of third light-emitting units, each emitting light of a third chromaticity different from the first chromaticity and the second chromaticity, The color temperature of the light with the third chromaticity lies in the range between the color temperature of the light with the first chromaticity and the color temperature of the light with the second chromaticity. The light-emitting module according to any one of claims 1 to 3, wherein the color temperature of the light with the first chromaticity, the color temperature of the light with the second chromaticity, and the color temperature of the light with the third chromaticity are between duv + 0.0010 and duv + 0.

015.

15. The light-transmitting member further comprises a cover portion including a light-diffusing portion, The light-diffusing portion is arranged to cover the light-emitting surface of the lens, as described in any one of claims 1 to 3.

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