Light-emitting module

Abstract

To provide a light-emitting module capable of emitting irradiation light with desired characteristics.SOLUTION: A light-emitting module comprises a first light source and a second light source arranged horizontally apart from the first light source, the first light source comprises a plurality of light emission parts including a first light emission part and a plurality of second light emission parts arranged around the first light emission part, and a light shield member which is arranged between the plurality of light emission parts and exposes respective light emission surfaces of the plurality of light emission parts, and the second light source includes a third light emission part connecting with the first light emission part in parallel, light of the first light emission part and light of the third light emission part overlapping each other at least in part.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a light-emitting module.

Background Art

[0002] Conventionally, light-emitting modules having semiconductor elements such as LEDs (Light Emitting Diodes) have been widely used. For example, Patent Document 1 discloses a light-emitting device that emits light by combining light from a plurality of light sources arranged separately.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An embodiment according to the present disclosure aims to provide a light-emitting module capable of irradiating light with desired characteristics.

Means for Solving the Problems

[0005] A light-emitting module according to an embodiment of the present disclosure includes a first light source and a second light source arranged horizontally spaced apart from the first light source. The first light source includes a plurality of light-emitting portions including a first light-emitting portion and a plurality of second light-emitting portions arranged around the first light-emitting portion, and a light-shielding member arranged between the plurality of light-emitting portions and exposing the light-emitting surfaces of the plurality of light-emitting portions. The second light source includes a third light-emitting portion connected in parallel with the first light-emitting portion. On the irradiation surface, at least a part of the light from the first light-emitting portion and the light from the third light-emitting portion overlap.

[0006] A light-emitting module according to an embodiment of the present disclosure includes a first light source including a first light-emitting portion and a plurality of second light-emitting portions arranged around the first light-emitting portion, and a second light source arranged horizontally spaced apart from the first light source and including a third light-emitting portion. On an irradiation surface, at least a part of the light from the first light-emitting portion and the light from the third light-emitting portion overlap. A first irradiation mode in which only the first light-emitting portion and the third light-emitting portion emit light, and a second irradiation mode in which each of the first light-emitting portion, the second light-emitting portion, and the third light-emitting portion emits light are switchable, and a light distribution angle in the first irradiation mode is smaller than a light distribution angle in the second irradiation mode.

Effects of the Invention

[0007] According to an embodiment of the present disclosure, a light-emitting module capable of irradiating light with desired characteristics can be provided.

Brief Description of the Drawings

[0008]

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Mode for Carrying Out the Invention

[0009] The light-emitting module according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, the forms shown below are examples of the light-emitting module for embodying the technical idea of the present embodiment, and are not limited thereto. In addition, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present disclosure only thereto without specific description, but are merely illustrative examples. Note that the sizes, positional relationships, etc. of the members shown in each drawing may be exaggerated for clarity of explanation. In the following description, the same names and reference numerals indicate the same or equivalent members, and detailed descriptions thereof will be omitted as appropriate. As a cross-sectional view, an end view showing only the cut surface may be used.

[0010] In the following figures, the directions may be indicated by the X-axis, Y-axis, and Z-axis. The X-axis, Y-axis, and Z-axis are mutually orthogonal. The X-direction along the X-axis and the Y-direction along the Y-axis shall indicate the directions along the light-emitting surface of the light-emitting unit included in the light-emitting module according to the embodiment. The Z-direction along the Z-axis shall indicate the direction orthogonal to the light-emitting surface. That is, the light-emitting surface of the light-emitting unit is parallel to the XY plane, and the Z-axis is orthogonal to the XY plane.

[0011] The direction in which the arrow points in the X-direction is denoted as the +X side, and the opposite side of the +X side is denoted as the -X side. The direction in which the arrow points in the Y-direction is denoted as the +Y side, and the opposite side of the +Y side is denoted as the -Y side. The direction in which the arrow points in the Z-direction is denoted as the +Z side, and the opposite side of the +Z side is denoted as the -Z side. In the embodiment, each of the first light source and the second light source included in the light-emitting module is assumed to emit light toward the +Z side as an example. The top view in the terms of the embodiment means looking at the object from above. As an example, the top view in the terms of the embodiment means looking at the object from the upper surface side of the first lens included in the light-emitting module according to the embodiment. However, these do not limit the orientation of the light-emitting module according to the embodiment during use, and the orientation of the light-emitting module according to the embodiment is arbitrary. In this specification, in addition to the parts that can be directly visually recognized from above, for the parts that cannot be directly visually recognized from above, the term top view may be used to describe as if they can be seen through.

[0012] In addition, in this specification, the surface of the object when viewed from the +Z side is defined as the "upper surface", and the surface of the object when viewed from the -Z side is defined as the "lower surface". In the embodiments described below, along the X-axis, Y-axis, and Z-axis includes that the object has an inclination within a range of ±10° with respect to these axes. Also, in this embodiment, parallel may include an error within ±10° with respect to 0°. Further, in this embodiment, orthogonal may include an error within ±10° with respect to 90°.

[0013] [Embodiment] <Configuration example of the light-emitting module according to the embodiment> (Overall configuration) With reference to FIGS. 1 to 4, the overall configuration of the light-emitting module according to the embodiment will be described. FIG. 1 is a schematic top view showing an example of the light-emitting module 100 according to the embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a schematic top view showing the first light source 1 and the second light source 2 included in the light-emitting module 100. Note that FIG. 3 shows a state in which the first lens 3, the second lens 4, and the light-transmissive member 5 are removed from the light-emitting module 100. FIG. 4 is a schematic diagram showing the light L1 irradiated from the first light-emitting portion 10-1 of the light-emitting module 100 to the irradiation surface S, and the light L2 irradiated from the third light-emitting portion 20 to the irradiation surface S.

[0014] As shown in FIGS. 1 to 4, the light-emitting module 100 includes a first light source 1 and a second light source 2 disposed horizontally spaced apart from the first light source 1. Note that the horizontal direction is a direction along the light-emitting surface 11 of the light-emitting portion 10 included in the first light source 1, and in the example shown in FIGS. 1 to 4, it is a direction along the XY plane. The first light source 1 includes a plurality of light-emitting portions 10 including a first light-emitting portion 10-1 and a plurality of second light-emitting portions 10-2 to 10-9 disposed around the first light-emitting portion 10-1, and a light-shielding member 15 disposed between the plurality of light-emitting portions 10 and exposing the light-emitting surfaces 11 of the plurality of light-emitting portions 10. The second light source 2 includes a third light-emitting portion 20 connected in parallel with the first light-emitting portion 10-1. On the irradiation surface S, at least a part of the light L1 from the first light-emitting portion 10-1 and the light L2 from the third light-emitting portion 20 overlap.

[0015] In the example shown in FIG. 4, the first irradiation region Ar1 represents a region on the irradiation surface S irradiated with the light L1 from the first light-emitting unit 10-1. The second irradiation region Ar2 represents a region on the irradiation surface S irradiated with the light L2 from the third light-emitting unit 20. The third irradiation region Ar3 represents a region on the irradiation surface S where the light L1 and the light L2 overlap. In the third irradiation region Ar3, the amount of light increases because the light L1 and the light L2 overlap. As a result, bright irradiation light can be obtained in the third irradiation region Ar3.

[0016] As an example, the light-emitting module 100 is mounted on a smartphone and is a light-emitting module for a flash in an imaging device provided in the smartphone. The imaging device includes a camera for taking still images, a video camera for taking moving images, and the like.

[0017] In the example shown in FIGS. 1 to 4, the first light source 1 includes nine light-emitting units 10 arranged in a 3×3 matrix. The first light-emitting unit 10-1 is arranged in the center. The second light-emitting units 10-2 to 10-9 are arranged around the first light-emitting unit 10-1. In the light-emitting module 100, depending on the shooting mode such as telephoto shooting or wide-angle shooting by an imaging device mounted on a smartphone, among the nine light-emitting units 10 included in the first light source 1, the light-emitting unit 10 to be made to emit light can be selected. In the light-emitting module 100, by selecting the light-emitting unit 10 to be made to emit light and causing the selected light-emitting unit 10 to irradiate light through a lens, irradiation light corresponding to each irradiation mode can be irradiated.

[0018] For example, in telephoto shooting, the light-emitting module 100 can set the irradiation mode to telephoto irradiation by causing only the first light-emitting unit 10-1 to emit light and not causing the second light-emitting units 10-2 to 10-9 to emit light. By telephoto irradiation, the light distribution angle of the irradiation light becomes narrow, and the light can reach far away. The imaging device can perform telephoto shooting using the irradiation light of telephoto irradiation.

[0019] In addition, in wide-angle shooting, among the nine light-emitting units 10 of the light-emitting module 100, the second light-emitting units 10-3, 10-8, 10-5, and 10-6 that are adjacent to the first light-emitting unit 10-1 in the vertical and horizontal directions respectively emit light with a first light amount. And the second light-emitting units 10-2, 10-4, 10-7, and 10-9 that are adjacent to the first light-emitting unit 10-1 in the diagonal direction emit light with a second light amount that is more than the first light amount. And the first light-emitting unit 10-1 emits light with a third light amount that is less than the first light amount. Thereby, the light-emitting module 100 can set the irradiation mode to wide-angle irradiation. With wide-angle irradiation, the light distribution angle of the irradiation light becomes wider than that of telephoto shooting, and light can be irradiated over a wide range. The imaging device can perform wide-angle shooting using the irradiation light of wide-angle irradiation.

[0020] Here, for example, in telephoto irradiation, as described above, since it is necessary to irradiate light with a predetermined light amount only by the first light-emitting unit 10-1, the input current to the first light-emitting unit 10-1 tends to increase. On the other hand, if the input current to the first light-emitting unit 10-1 is increased to increase the light amount, the junction temperature Tj of the light-emitting element included in the first light-emitting unit 10-1 may exceed the allowable value. Specifically, in a light-emitting module in which a predetermined current E (for example, a current of 2.5 A) is input to the first light-emitting unit 10-1, when a current greater than the predetermined current E (for example, a current of 3.0 A) is input to increase the light amount, the junction temperature Tj of the light-emitting element becomes high and may exceed the allowable value of the junction temperature Tj. Also, in order to lower the junction temperature Tj of the light-emitting element included in the first light-emitting unit 10-1, for example, if the input current is shunted to the second light-emitting units 10-2 to 10-9 located around the first light-emitting unit 10-1, the light from the second light-emitting units 10-2 to 10-9 cannot reach far because the light distribution angle is wider than that of the light from the first light-emitting unit 10-1. As a result, the light amount of telephoto irradiation decreases, and the quality of telephoto shooting by the imaging device may deteriorate.

[0021] In the light-emitting module 100, by connecting the first light-emitting portion 10-1 of the first light source 1 and the third light-emitting portion 20 of the second light source 2 in parallel, the current input to the light-emitting module 100 when light is emitted is shunted to the first light-emitting portion 10-1 and the third light-emitting portion 20. By shunting the input current, the first light-emitting portion 10-1 and the third light-emitting portion 20 can emit light in parallel. The light L1 from the first light-emitting portion 10-1 and the light L2 from the third light-emitting portion 20 at least partially overlap on the irradiation surface S. By overlapping the light L1 and the light L2 on the irradiation surface S, the light amount of the light L1 can be assisted by the light amount of the light L2, and the light amount of the telephoto irradiation on the irradiation surface S can be increased to make it brighter. Thus, in the present embodiment, it is possible to irradiate light with a desired light amount characteristic on the irradiation surface S, and to provide the light-emitting module 100 capable of irradiating light with a desired characteristic.

[0022] Also, in the light-emitting module 100, by shunting the current input to the light-emitting module 100 to the first light-emitting portion 10-1 and the third light-emitting portion 20, it is possible to reduce the temperature rise of the first light-emitting portion 10-1 due to current concentration in the first light-emitting portion 10-1. Further, in the light-emitting module 100, the second light source 2 including the third light-emitting portion 20 is arranged separately from the first light source 1 including the first light-emitting portion 10-1. Thereby, since the heat dissipation property is higher compared with the case where the third light-emitting portion 20 and the first light-emitting portion 10-1 are arranged close to each other, the temperature rise of the first light-emitting portion 10-1 can be reduced. By reducing the temperature rise of the first light-emitting portion 10-1, it is possible to reduce the temperature of the light-emitting element included in the first light-emitting portion 10-1 exceeding the allowable value of the junction temperature Tj when light is emitted, and to reduce failures or damages of the light-emitting module 100. As a result, in the present embodiment, it is possible to provide a highly reliable light-emitting module 100.

[0023] In another form of the light-emitting module 100, on the irradiation surface S, if at least a part of the light L1 from the first light-emitting unit 10-1 and the light L2 from the third light-emitting unit 20 overlap, the first light-emitting unit 10-1 of the first light source 1 and the third light-emitting unit 20 of the second light source 2 do not necessarily have to be connected in parallel. For example, the light-emitting module 100 includes a first light source 1 including the first light-emitting unit 10-1 and the second light-emitting units 10-2 to 10-9 arranged around the first light-emitting unit 10-1, and a second light source 2 arranged horizontally spaced apart from the first light source 1 and including the third light-emitting unit 20. On the irradiation surface S, at least a part of the light L1 from the first light-emitting unit 10-1 and the light L2 from the third light-emitting unit 20 overlap. The light-emitting module 100 can switch between a first irradiation mode in which only the first light-emitting unit 10-1 and the third light-emitting unit 20 emit light, and a second irradiation mode in which each of the first light-emitting unit 10-1, the second light-emitting units 10-2 to 10-9, and the third light-emitting unit 20 emits light. The light distribution angle in the first irradiation mode is smaller than the light distribution angle in the second irradiation mode. The first irradiation mode is, for example, an irradiation mode corresponding to telephoto irradiation. The second irradiation mode is, for example, an irradiation mode corresponding to wide-angle irradiation. As described above, in the first irradiation mode (for example, the telephoto irradiation mode), both the first light-emitting unit 10-1 and the third light-emitting unit 20 irradiate light. Therefore, compared with a light-emitting module that irradiates light only with the first light-emitting unit 10-1 in the first irradiation mode, in this embodiment, the amount of light on the irradiation surface S can be increased, and a light-emitting module 100 that can irradiate light with desired characteristics can be provided.

[0024] In the examples shown in FIGS. 1 to 3, the light-emitting module 100 further includes a first lens 3 disposed above the first light source 1. The first lens 3 shown in FIG. 2 includes a first incident surface 35 on which light from the first light source 1 is incident and which is convex in a direction approaching the first light source 1, and a first exit surface 31 from which light from the first light source exits. The first exit surface 31 is located on the opposite side of the first incident surface 35. Each of the first incident surface 35 and the first exit surface 31 preferably overlaps the first light source 1 and does not overlap the second light source 2 in a top view. Further, the light transmissivity of the first lens 3 preferably has a property of having a transmittance of 60% or more with respect to the emission peak wavelength of the light emitted from the first light source 1. With this configuration, in the light-emitting module 100, it is possible to reduce the incidence of the light emitted from the second light source 2 onto the first incident surface 35 of the first lens 3. Then, it is possible to reduce stray light generated by the incidence of the light from the second light source 2 onto the first incident surface 35, and improve the quality of the irradiation light by the light-emitting module 100. Note that high quality of the irradiation light means, for example, that the light distribution pattern in the irradiation light has symmetry, or that the irradiation of light to an unintended area on the irradiation surface S is reduced.

[0025] In the examples shown in FIGS. 1 to 3, the light-emitting module 100 is disposed above the third light-emitting unit 20, faces the third light-emitting surface 21 of the third light-emitting unit 20, and further includes a second lens 4 having a second incident surface 41 that is spaced apart from the first incident surface 35 in a top view. As shown in FIGS. 1 and 2, as the second lens 4, a rod-shaped light-transmissive member having a substantially rectangular shape in a top view and extending in the Z direction can be used. The light transmissivity of the second lens 4 preferably has a property of having a transmittance of 60% or more with respect to the emission peak wavelength of the light L2 emitted from the third light-emitting unit 20.

[0026] The light L2 emitted from the third light-emitting unit 20 is incident into the second lens 4 through the second incident surface 41 of the second lens 4. The second lens 4 can guide the light L2 incident into the interior through the second incident surface 41 in the +Z direction and emit it from the second exit surface 42. Also, in a top view, it is preferable that the shape of the second incident surface 41 of the second lens 4 and the shape of the third light-emitting surface 21 of the third light-emitting unit 20 are substantially the same as each other. For example, the shape of the second incident surface 41 of the second lens 4 and the shape of the third light-emitting surface 21 of the third light-emitting unit 20 are substantially rectangular. Also, the shape of the second incident surface 41 of the second lens 4 and the shape of the third light-emitting surface 21 of the third light-emitting unit 20 may be similar to each other or congruent. In a top view, since the shape of the second incident surface 41 of the second lens 4 and the shape of the third light-emitting surface 21 of the third light-emitting unit 20 are substantially the same, in a top view, compared with the case where the shape of the second incident surface 41 of the second lens 4 and the shape of the third light-emitting surface 21 of the third light-emitting unit 20 are different, it becomes easier to reduce the light loss due to the light L2 from the third light-emitting unit 20 not being incident on the second lens 4. Thereby, the light extraction efficiency of the light-emitting module 100 can be increased. Note that in a top view, the shape of the second incident surface 41 of the second lens 4 and the shape of the third light-emitting surface 21 of the third light-emitting unit 20 may be different from each other.

[0027] By including the second lens 4 that guides the light L2 emitted from the third light-emitting unit 20, the light-emitting module 100 can reduce the incidence of the light L2 emitted from the third light-emitting unit 20 on the first incident surface 35 of the first lens 3. And it is possible to reduce the stray light generated by the light L2 from the third light-emitting unit 20 being incident on the first incident surface 35. Also, by including the second lens 4, the light-emitting module 100 can increase the light extraction efficiency of the light L2 emitted from the third light-emitting unit 20 and increase the amount of light on the irradiation surface S.

[0028] Also, in the examples shown in FIGS. 1 to 3, the first optical axis 3C of the first lens 3 passing through the center of the first incident surface 35 intersects the first light emitting portion 10-1, and the second optical axis 4C of the second lens 4 passing through the center of the second incident surface 41 intersects the third light emitting portion 20. The second optical axis 4C is parallel to the first optical axis 3C. With this configuration, since the light from the first light emitting portion 10-1 and the light from the third light emitting portion 20 are irradiated in the same direction, on the irradiation surface S, the light from the first light emitting portion 10-1 and the light from the third light emitting portion 20 are likely to overlap, and it becomes easier to assist the light quantity of the light from the first light emitting portion 10-1 with the light quantity of the light from the third light emitting portion 20. Thereby, the light quantity of the first irradiation mode (for example, telephoto irradiation) by the light emitting module 100 can be increased.

[0029] Also, in the examples shown in FIGS. 1 to 3, the second lens 4 includes a second exit surface 42 from which the light L2 from the third light emitting portion 20 incident on the second incident surface 41 is emitted. The second incident surface 41 and the second exit surface 42 are preferably flat surfaces parallel to each other. Since the second incident surface 41 and the second exit surface 42 are flat surfaces parallel to each other, after the light L2 from the third light emitting portion 20 passes through the second lens 4, the deviation of the illuminance distribution of the light L2 from the third light emitting portion 20 can be reduced, and the control accuracy of the light L2 from the third light emitting portion 20 by the second lens 4 can be increased. Note that the second exit surface 42 may include any one of a plurality of irregularities, a convex surface, or a concave surface. The plurality of irregularities includes any one of a plurality of concave portions, a plurality of convex portions, or both a plurality of concave portions and a plurality of convex portions. The plurality of irregularities may be a Fresnel shape formed in a concentric circle. By including any one of a plurality of irregularities, a convex surface, or a concave surface in the second exit surface 42, the control accuracy of the light L2 from the third light emitting portion 20 by the second lens 4 can be increased.

[0030] Also, in the examples shown in FIGS. 1 to 3, the second incident surface 41 is located below the first incident surface 35, and the second exit surface 42 is located above the first incident surface 35. With this configuration, it is possible to reduce the incidence of the light L2 emitted from the third light emitting unit 20 onto the first incident surface 35 of the first lens 3. Specifically, the light L2 emitted from the third light emitting unit 20 is mainly incident on the second incident surface 41 of the second lens 4, and then is irradiated onto the irradiation surface S through the second exit surface 42. Thereby, it is possible to reduce stray light generated by the light L2 from the third light emitting unit 20 being incident on the first incident surface 35.

[0031] Also, in the light emitting module 100, it is preferable that the current value input to the third light emitting unit 20 is equal to or less than the current value input to the first light emitting unit 10-1. In other words, in the light emitting module 100, it is preferable that the current value input to the first light emitting unit 10-1 is equal to or greater than the current value input to the third light emitting unit 20. The first light emitting unit 10-1 and the plurality of second light emitting units 10-2 to 10-9 in the first light source 1 can partially irradiate light onto corresponding regions among the plurality of divided regions within the irradiatable range on the irradiation surface S. On the other hand, the second light source 2 including the third light emitting unit 20 is arranged horizontally separated from the first light source 1. Therefore, although the light emitted from the second light source 2 at least partially overlaps the irradiation region of the first light emitting unit 10-1 on the irradiation surface S, it may be difficult to accurately irradiate light onto the divided regions within the irradiatable range. Therefore, by setting the current value input to the first light emitting unit 10-1 to be equal to or greater than the current value input to the third light emitting unit 20, the first light source 1 functions as the main light source in the light emitting module 100, and the second light source 2 functions as an auxiliary light source, thereby improving the irradiation accuracy in partial irradiation of the light emitting module 100. Thereby, for example, within the above-mentioned irradiatable range, while accurately irradiating the partial irradiation for each matrix-shaped region by the first light source 1, the second light source 2 can perform auxiliary irradiation on the central region. Note that in the light emitting module 100, the current value input to the third light emitting unit 20 may be higher than the current value input to the first light emitting unit 10-1.

[0032] In addition, in the light-emitting module 100, it is possible to switch between a first irradiation mode in which only the first light-emitting unit 10-1 and the third light-emitting unit 20 emit light, and a second irradiation mode in which each of the first light-emitting unit 10-1, the second light-emitting units 10-2 to 10-9, and the third light-emitting unit 20 emits light. The light distribution angle of the light-emitting module 100 in the first irradiation mode is smaller than the light distribution angle of the light-emitting module 100 in the second irradiation mode. By reducing the light distribution angle of the first irradiation mode, the light emitted from the light-emitting module 100 can reach farther than in a light-emitting module with a large light distribution angle in the first irradiation mode. As a result, for example, in an imaging device that performs imaging using the light emitted from the light-emitting module 100, it becomes easier to supply sufficient light during telephoto shooting.

[0033] In addition, as described above, the light-emitting module 100 can be used as a light source for a flash. When the light-emitting module 100 is used as a light source for a flash, particularly in the first irradiation mode, it is possible to reduce the temperature of the first light-emitting unit 10-1 exceeding the allowable value of the junction temperature Tj when light is emitted. As a result, in this embodiment, it is possible to provide a highly reliable light-emitting module 100 for a flash that reduces failures or damages caused by the temperature of the light-emitting unit 10 exceeding the allowable value of the junction temperature Tj in a specific irradiation mode.

[0034] In addition, in the light-emitting module 100, the planar size of the light-emitting element included in the third light-emitting unit 20 may be larger than the planar size of the light-emitting element included in the first light-emitting unit 10-1. By making the light-emitting element included in the third light-emitting unit 20 larger than the light-emitting element included in the first light-emitting unit 10-1, the resistance value of the third light-emitting unit 20 against heat or electricity decreases. As a result, it is possible to reduce the heat accumulation in the third light-emitting unit 20 and reduce the occurrence of failures or damages in the third light-emitting unit 20. Furthermore, by increasing the planar size of the light-emitting element included in the third light-emitting unit 20, the electrodes of the third light-emitting unit 20 or the wiring on the substrate side corresponding thereto also tend to become larger, so that the heat generated in the third light-emitting unit 20 can be efficiently dissipated.

[0035] In the light-emitting module 100, the planar size of the light-emitting element included in the third light-emitting unit 20 may be smaller than the planar size of the light-emitting element included in the first light-emitting unit 10-1. By making the light-emitting element included in the third light-emitting unit 20 smaller than the light-emitting element included in the first light-emitting unit 10-1, the third light-emitting unit 20 can be made closer to a point light source, and the light distribution control of the third light-emitting unit 20 can be facilitated.

[0036] In the light-emitting module 100, the separation distance between the first light-emitting unit 10-1 and the third light-emitting unit 20 is, for example, 500 μm or more and 2500 μm or less, preferably 1000 μm or more and 2000 μm or less. The separation distance between the first light-emitting unit 10-1 and the third light-emitting unit 20 is, for example, the shortest distance in a top view between the light-emitting element included in the first light-emitting unit 10-1 and the light-emitting element included in the third light-emitting unit 20. Also, the separation distance between the first light-emitting unit 10-1 and the third light-emitting unit 20 with respect to the separation distances of the first light-emitting unit 10-1 and the second light-emitting units 10-3, 10-5, 10-6, 10-8 adjacent to the first light-emitting unit 10-1 in the X direction or the Y direction is, for example, 5 times or more and 30 times or less, preferably 10 times or more and 20 times or less. For example, the separation distance between the first light-emitting unit 10-1 and the second light-emitting unit 10-3 is the shortest distance in a top view between the light-emitting element included in the first light-emitting unit 10-1 and the light-emitting element included in the second light-emitting unit 10-3. Also, the distances from the light-emitting surface 11 of the first light-emitting unit 10-1 and the third light-emitting surface 21 of the third light-emitting unit 20 to the irradiation surface S are, for example, 0.01 m or more and 10 m or less, preferably 0.10 m or more and 5 m or less. The illuminance in the third irradiation region Ar3 on the irradiation surface S is, for example, 100 lux or more, preferably 1000 lux or more, when the distance from the third light-emitting surface 21 of the third light-emitting unit 20 to the irradiation surface S is 0.3 mm.

[0037] (Detailed Configuration) Hereinafter, the details of each configuration in the light-emitting module 100 will be described.

[0038] (Light-transmissive member 5) As shown in FIGS. 1 to 3, the light-emitting module 100 can include a translucent member 5. The translucent member 5 includes an upper portion 51 facing the first emission surface 31 of the first lens 3, a cylindrical portion 52 supporting the end of the upper portion 51, and a leg portion 53 disposed in contact with the lower portion of the cylindrical portion 52. In the translucent member 5 shown in FIG. 2, the upper portion 51, the cylindrical portion 52, and the leg portion 53 are an integral member. However, the upper portion 51, the cylindrical portion 52, and the leg portion 53 may be separate members that are not connected to each other. The translucent member 5 is disposed so as to cover the first light source 1, the second light source 2, the first lens 3, and the second lens 4. The translucent member 5 is joined to the first lens 3 by a first joining member 54 annularly disposed at the outer edge portion of the first lens 3 in a top view. In the example shown in FIG. 1, the translucent member 5 has a substantially circular shape in a top view. However, the shape of the translucent member 5 in a top view may be a substantially elliptical shape, a substantially rectangular shape, a substantially polygonal shape, or the like.

[0039] The translucent member 5 is configured to include at least one of resin materials such as polycarbonate resin, acrylic resin, silicone resin, and epoxy resin or glass materials that are translucent to the light emitted from each of the first light source 1 and the second light source 2. Note that the translucency of the translucent member 5 preferably has a light transmittance of 60% or more with respect to the emission peak wavelength of the light emitted from each of the first light source 1 and the second light source 2.

[0040] In the example shown in FIGS. 1 to 3, the upper portion 51 is disposed above the first light source 1, the second light source 2, the first lens 3, and the second lens 4. On the lower surface 510 of the upper portion 51 facing the first lens 3, a shape having light diffusibility such as an uneven shape or a Fresnel shape or a shape that refracts light may be formed. By forming a shape having light diffusibility or the like on the lower surface 510, it becomes difficult to visually recognize the inside of the light-emitting module 100 from the outside of the light-emitting module 100. Thereby, the aesthetic appearance of the light-emitting module 100 can be improved. From the viewpoint of facilitating the light distribution control of the light emitted from the light-emitting module 100, the shape formed on the lower surface 510 preferably has only a function of diffusing or scattering light and does not have a light control function by refraction or diffraction.

[0041] The cylindrical portion 52 is a cylindrical part that supports the upper portion 51. The leg portion 53 is a portion disposed outside the cylindrical portion 52 in a top view. The leg portion 53 can be used to fix the light-transmissive member 5 to a housing of a smartphone or the like.

[0042] (Wiring board 6) As shown in FIGS. 1 to 4, the light-emitting module 100 can include a wiring board 6. The first light source 1 and the second light source 2 are disposed on the +Z side surface of the wiring board 6. In the example shown in FIG. 1, the wiring board 6 is a substantially circular plate-shaped member in a top view. In the example shown in FIG. 2, the wiring board 6 is joined to the first lens 3 by a second joining member 61 annularly disposed at a position where the upper surface of the wiring board 6 and the bottom surface 32 located at the outer edge of the first lens 3 face each other. The wiring board 6 includes wirings on which the first light source 1, the second light source 2, etc. can be mounted. Note that the shape of the wiring board 6 in a top view may be substantially rectangular, substantially elliptical, substantially polygonal, or the like.

[0043] It is preferable to use an insulating material as the base material for the wiring board 6, and it is preferable to use a material that is difficult to transmit light emitted from the first light source 1 and the second light source 2, external light, etc. Also, it is preferable to use a material having a certain strength for the wiring board 6. Specifically, the wiring board 6 can be configured with ceramics such as alumina, aluminum nitride, mullite, silicon nitride, or resins such as phenolic resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), polyphthalamide, polyester resin as the base material.

[0044] The wiring board 6 has, for example, wirings disposed on the surface of the base material. The wirings are composed of, for example, metals such as Cu, Ag, Au, Al, Pt, Ti, W, Pd, Fe, Ni and / or alloys containing at least those metals.

[0045] The light-emitting module 100 is not limited to one wiring board 6, and may include, for example, a plurality of wiring boards including a first wiring board and a second wiring board. The first light source 1 and the second light source 2 may be arranged on each wiring board. For example, the first light source 1 may be arranged on the first wiring board, and the second light source 2 may be arranged on the second wiring board, respectively.

[0046] (The first light source 1 and the second light source 2) Next, with reference to FIGS. 3 and 5 to 7, the configurations of the first light source 1 and the second light source 2 will be described in detail.

[0047] As shown in FIG. 3, the first light source 1 has nine light-emitting portions 10, and the light-shielding member 15 can integrally hold a plurality of light-emitting elements 12 and a plurality of wavelength conversion members 14. In the example shown in FIG. 3, the light-shielding member 15 integrally holds the nine light-emitting elements 12 and the nine wavelength conversion members 14 provided in the nine light-emitting portions 10.

[0048] In the example shown in FIG. 3, the first light source 1 has nine light-emitting portions 10 including a first light-emitting portion 10-1 and second light-emitting portions 10-2 to 10-9. The nine light-emitting portions 10 are arranged, for example, longitudinally, horizontally, or in a matrix in a top view. From another perspective, the nine light-emitting portions 10 are arranged along the X direction, or along the X direction and the Y direction orthogonal to the X direction. In the example shown in FIG. 3, the nine light-emitting portions 10 are arranged along each of the X direction and the Y direction. Note that the first light source 1 is not limited to having nine light-emitting portions 10, and may include any number of first light-emitting portions and second light-emitting portions as long as it includes a first light-emitting portion and a plurality of second light-emitting portions arranged around the first light-emitting portion.

[0049] Each of the first light-emitting unit 10-1 and the second light-emitting units 10-2 to 10-9 includes a light-emitting surface 11. The light-emitting surface 11 of each of the first light-emitting unit 10-1 and the second light-emitting units 10-2 to 10-9 is preferably arranged inside the first lens 3 (inside the outer shape of the first lens 3) shown in FIG. 2 in a top view, and more preferably arranged inside the first incident surface 35 of the first lens 3. Thereby, the light from the first light source 1 is more likely to be incident on the first lens 3. In the top view, since the first light-emitting unit 10-1 and the second light-emitting units 10-2 to 10-9 overlap the light-emitting surface 11 included in each of them, in the example shown in FIG. 3, the reference numerals of the first light-emitting unit 10-1 and the second light-emitting units 10-2 to 10-9 and the reference numeral of the light-emitting surface 11 are shown together. Also in the following, when two or more substantially coincide or overlap, the reference numerals may be shown together.

[0050] The width along the X direction and the width along the Y direction of the light-emitting surface 11 are, for example, 30 μm or more and 2000 μm or less, and preferably 100 μm or more and 1000 μm or less. The width along the X direction and the width along the Y direction of the light-emitting surface 11 may be substantially equal or different. In the example shown in FIG. 3, the light-emitting surfaces 11 of adjacent light-emitting units 10 are arranged with a predetermined interval in a top view. From the viewpoint of the light-emitting characteristics of the first light source 1, the smaller this predetermined interval is, the more preferable it is. However, there is a limit to the interval at which a plurality of light-emitting units 10 can be mounted. In order to achieve both good light-emitting characteristics and an interval at which a plurality of light-emitting units 10 can be mounted, the predetermined interval is preferably 10 μm or more and 50 μm or less in each case. In the example shown in FIG. 3, the shape of the light-emitting surface 11 in a top view is substantially rectangular. However, the shape of the light-emitting surface 11 in a top view may be substantially circular or substantially elliptical, or may be a polygon such as a substantially triangular or substantially hexagonal shape.

[0051] FIG. 5 is a schematic cross-sectional view showing an example of the V-V line in FIG. 3. Note that the main configurations of the first light-emitting unit 10-1, the second light-emitting units 10-2 to 10-9, and the third light-emitting unit 20 are all the same. Therefore, the description of the configuration of the second light-emitting unit 10-2 using FIG. 5 can be applied to each of the first light-emitting unit 10-1, the second light-emitting units 10-3 to 10-9, and the third light-emitting unit 20 by appropriately changing the name, reference numeral, etc. of the second light-emitting unit 10-2.

[0052] In the example shown in FIG. 5, the second light-emitting unit 10-2 includes a light-emitting element 12, a wavelength conversion member 14 disposed on the light-emitting element 12, and a light-shielding member 15 that covers each of the side surfaces of the light-emitting element 12 and the wavelength conversion member 14. The second light-emitting unit 10-2 emits light upward from the first light source 1 from the light-emitting surface 11. The light-emitting surface 11 refers to the main light extraction surface in the second light-emitting unit 10-2. The light emitted from the second light-emitting unit 10-2 may be white light or light having a specific wavelength such as blue. The wavelength and chromaticity of the light emitted from the second light-emitting unit 10-2 may be appropriately selected according to the intended use of the light-emitting module 100.

[0053] By including the light-emitting element 12 and the wavelength conversion member 14, the light-emitting unit 10 and the third light-emitting unit 20 can emit a mixed-color light of the color of the light emitted from the light-emitting element 12 and the color of the light emitted from the wavelength conversion member 14. In the light-emitting unit 10 and the like, the combination of the light-emitting element 12 and the wavelength conversion member 14 can increase the degree of freedom of the color of the light emitted from the first light source 1. Further, by including the light-shielding member 15, the light-emitting unit 10 can shield the light emitted from the light-emitting element 12 with the light-shielding member 15, and can control the spread of the light emitted from the light-emitting unit 10 and the like.

[0054] In the example shown in FIG. 5, the second light-emitting unit 10-2 has the light-emitting surface 11 as the upper surface and the surface opposite to the light-emitting surface 11 as the mounting surface, and is disposed on the +Z side surface of the wiring board 6. The wavelength conversion member 14 is provided on the +Z side surface of the light-emitting element 12. The light-shielding member 15 covers the side surfaces of the light-emitting element 12 and the wavelength conversion member 14 except for the upper surface of the wavelength conversion member 14.

[0055] The light-emitting element 12 has at least a pair of positive and negative electrodes 13 on the surface (i.e., the lower surface) opposite to the light-emitting surface 11 side.

[0056] The light-emitting element 12 is preferably made of various semiconductors such as III-V group compound semiconductors and II-VI group compound semiconductors. As the semiconductor, it is preferable to use nitride semiconductors such as In X Al Y Ga 1-X-Y N (0 ≦ X, 0 ≦ Y, X + Y ≦ 1), etc. InN, AlN, GaN, InGaN, AlGaN, InGaAlN, etc. can also be used. The light-emitting element 12 is, for example, an LED or an LD. From the viewpoints of luminous efficiency and excitation of the wavelength conversion material, etc., the emission peak wavelength of the light-emitting element 12 is preferably 400 nm or more and 530 nm or less, more preferably 420 nm or more and 490 nm or less, and even more preferably 450 nm or more and 475 nm or less.

[0057] The wavelength conversion member 14 is, for example, a substantially rectangular member in a top view. The wavelength conversion member 14 is provided so as to cover the upper surface of the light emitting element 12. The wavelength conversion member 14 contains a wavelength conversion material that wavelength-converts at least a part of the light from the light emitting element 12. The wavelength conversion member 14 can be configured using a translucent resin material, an inorganic material such as ceramics or glass. As the resin material, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, an epoxy-modified resin, or a phenolic resin can be used. In particular, a silicone resin or a modified resin thereof having excellent light resistance and heat resistance is preferable. Here, the translucency preferably means a property of transmitting 60% or more of the light emission peak wavelength of the light from the light emitting element 12. Further, the wavelength conversion member 14 can use a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a methylpentene resin, or a polynorbornene resin. For example, the wavelength conversion member 14 may be a material in which a wavelength conversion material is contained in a resin material, ceramics, glass, etc., a sintered body of a wavelength conversion material, or the like. The wavelength conversion member 14 may further contain a light diffusion material in a resin material, ceramics, glass, etc. Further, the wavelength conversion member 14 may be composed of a plurality of layers including a layer containing a wavelength conversion material and a layer not containing a wavelength conversion material. For example, the wavelength conversion member 14 may include a wavelength conversion layer containing a wavelength conversion material and a light diffusion layer located on the upper surface of the wavelength conversion layer and containing a light diffusion material. The wavelength conversion member may be provided with a translucent layer that does not contain a wavelength conversion material and a light diffusion material, instead of or in addition to the light diffusion layer.

[0058] Examples of the wavelength conversion material contained in the wavelength conversion member 14 include yttrium aluminum garnet-based phosphors (e.g., (Y,Gd) 3 (Al,Ga) 5 O 12 :Ce), lutetium aluminum garnet-based phosphors (e.g., Lu 3 (Al,Ga) 5 O 12 :Ce), terbium aluminum garnet-based phosphors (e.g., Tb 3 (Al,Ga) 5 O 12:Ce), CCA-based phosphors (e.g., Ca 10 (PO 4 ) 6 Cl 2 :Eu), SAE-based phosphors (e.g., Sr 4 Al 14 O 25 :Eu), chlorosilicate-based phosphors (e.g., Ca 8 MgSi 4 O 16 Cl 2 :Eu), silicate-based phosphors (e.g., (Ba,Sr,Ca,Mg) 2 SiO 4 :Eu), β-sialon-based phosphors (e.g., (Si,Al) 3 (O,N) 4 :Eu) or α-sialon-based phosphors (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu), etc., oxynitride-based phosphors, LSN-based phosphors (e.g., (La,Y) 3 Si 6 N 11 :Ce), BSESN-based phosphors (e.g., (Ba,Sr) 2 Si 5 N 8 :Eu), SLA-based phosphors (e.g., SrLiAl 3 N 4 :Eu), CASN-based phosphors (e.g., CaAlSiN 3 :Eu) or SCASN-based phosphors (e.g., (Sr,Ca)AlSiN 3 :Eu), etc., nitride-based phosphors, KSF-based phosphors (e.g., K 2 SiF 6 :Mn), KSAF-based phosphors (e.g., K 2 (Si 1-x Al x )F 6-x :Mn Here, x satisfies 0 < x < 1.) or MGF-based phosphors (e.g., 3.5MgO·0.5MgF 2 ·GeO 2 :Mn), etc., fluoride-based phosphors, quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I) 3Here, FA and MA represent formamidinium and methylammonium, respectively. ), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se) 2 ) etc. can be used. The above wavelength conversion material is a particle. Also, one of these wavelength conversion materials can be used alone, or two or more of these wavelength conversion materials can be used in combination.

[0059] The light emitting part 10 and the third light emitting part 20 have, for example, a blue light emitting element as the light emitting element 12, and emit white light by including a wavelength conversion material that wavelength-converts the light emitted from the light emitting element 12 into yellow. As the light diffusing material contained in the wavelength conversion member 14, for example, titanium oxide, barium titanate, aluminum oxide, silicon oxide, etc. can be used.

[0060] The light shielding member 15 is a member that covers the side surfaces of the light emitting element 12 and the wavelength conversion member 14. The light shielding member 15 directly or indirectly covers the side surfaces of the light emitting element 12 and the wavelength conversion member 14. The upper surface of the wavelength conversion member 14 is exposed from the light shielding member 15 and functions as the light emitting surface 11 of the light emitting part 10 or the third light emitting part 20. The light shielding member 15 is preferably composed of a member having a high light reflectance in order to improve the light extraction efficiency. The light shielding member 15 can use, for example, a resin material containing a light reflective substance such as a white pigment.

[0061] Examples of the light-reflective material include titanium oxide, 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 in combination of two or more of these. Further, as the resin material, it is preferable to use, as a base material, a resin material mainly composed of a thermosetting resin such as an epoxy resin, an epoxy-modified resin, a silicone resin, a silicone-modified resin, or a phenol resin. Note that the light-shielding member 15 may be composed of a member having light absorptivity with respect to visible light. When the light-shielding member 15 is composed of a member having light absorptivity, the light-shielding member 15 may contain, for example, a light-absorbing substance such as carbon black.

[0062] The first light source 1 is electrically connected to a wiring 62 provided in the wiring board 6. The wiring board 6 preferably includes a wiring 62 disposed on the surface. The wiring board 6 may include a wiring 62 inside. Each light-emitting unit 10 included in the first light source 1 and the wiring board 6 are electrically connected by connecting the wiring 62 of the wiring board 6 and a pair of positive and negative electrodes 13 of each light-emitting unit 10 via a conductive member 63. Note that the configuration, size, etc. of the wiring 62 of the wiring board 6 are set according to the configuration and size of the electrodes 13 of each light-emitting unit 10. In addition to the first light source 1, a second light source 2 may be disposed on the wiring board 6. In this case, the second light source 2 is disposed horizontally spaced apart from the first light source 1 on the upper surface of the wiring board 6. Note that the first light source 1 and the second light source 2 may be disposed on different wiring boards.

[0063] FIG. 6 is a schematic cross-sectional view showing a first example of the configuration of the first light source 1. FIG. 7 is a schematic cross-sectional view showing a second example of the configuration of the first light source 1. FIGS. 6 and 7 schematically show a cross-section of the first light source 1 including the first light-emitting unit 10-1, the second light-emitting unit 10-5, and the second light-emitting unit 10-6.

[0064] In the first example shown in FIG. 6, the first light source 1 individually includes a wavelength conversion member 14 for each of the first light emitting unit 10-1, the second light emitting unit 10-5, and the second light emitting unit 10-6. The light emitting elements 12 included in each of the first light emitting unit 10-1, the second light emitting unit 10-5, and the second light emitting unit 10-6 are arranged separately from each other via a light shielding member 15. Further, the wavelength conversion members 14 included in each of the first light emitting unit 10-1, the second light emitting unit 10-5, and the second light emitting unit 10-6 are arranged separately from each other via a light shielding member 15.

[0065] On the other hand, in the second example shown in FIG. 7, the first light source 1 includes a common wavelength conversion member 14 for each of the first light emitting unit 10-1, the second light emitting unit 10-5, and the second light emitting unit 10-6. The light emitting elements 12 included in each of the first light emitting unit 10-1, the second light emitting unit 10-5, and the second light emitting unit 10-6 are arranged separately from each other via a light shielding member 15. On the other hand, in the second example, one wavelength conversion member 14 is arranged so as to cover the entire light emitting elements 12 included in each of the first light emitting unit 10-1, the second light emitting unit 10-5, and the second light emitting unit 10-6.

[0066] (First lens 3 and second lens 4) Next, with reference to FIGS. 8 to 10, the configurations of the first lens 3 and the second lens 4 will be described in detail. FIG. 8 is a schematic top view showing an example of the configuration of the first lens 3. FIG. 9 is a schematic bottom view showing an example of the configuration of the first lens 3. FIG. 10 is a schematic cross-sectional view showing an example of the X-X line in FIG. 8. Note that in FIG. 9, some lines are omitted.

[0067] In the example shown in FIG. 8, the shape of the outer edge of the first lens 3 in a top view is substantially circular. However, the shape of the outer edge of the first lens 3 in a top view may be substantially rectangular, substantially elliptical, or substantially polygonal, etc. Also, the shape of the outer edge of the first lens 3 in a top view may be a rotationally symmetric shape. Considering that the shooting range of a general imaging device is substantially rectangular, the shape of the outer edge of the first lens 3 in a top view is preferably a four-fold rotationally symmetric shape or a two-fold rotationally symmetric shape.

[0068] In the examples shown in FIGS. 9 and 10, the first lens 3 includes a first exit surface 31 that is convex on the side opposite to the first incident surface 35, that is, on the side where the light from the first light source 1 exits the first lens 3, and on the side opposite to the side where the first light source 1 is located. Note that, for the first lens 3, the size of the first lens 3 in a top view, the size of the radius of curvature of the first incident surface 35, the size of the radius of curvature of the convex surface of the first exit surface 31, the thickness of the lens, the shape of the convex surfaces of the first incident surface 35 and the first exit surface 31, etc. can be appropriately changed.

[0069] The first lens 3 can be configured to include at least one of resin materials such as polycarbonate resin, acrylic resin, silicone resin, and epoxy resin or glass materials that are translucent to the light L emitted from the first light source 1. When the first lens 3 and the second lens 4 are an integral member, the second lens 4 can be made of the same material as the first lens 3.

[0070] In the examples shown in FIGS. 8 to 10, the first lens 3 and the second lens 4 are an integral member. For example, the first lens 3 and the second lens 4 are configured to include a translucent resin material and are integrally manufactured by injection molding or the like. Note that the translucency of the first lens 3 and the second lens 4 preferably has a transmittance of 60% or more with respect to the emission peak wavelengths of the light L1 from the first light emitting unit 10-1 and the light L2 from the third light emitting unit 20. The fact that the first lens 3 and the second lens 4 are an integral member can facilitate the assembly of the light emitting module 100. When the first lens 3 and the second lens 4 are separate members, for example, the first lens 3 and the second lens 4 may be manufactured in separate molding processes. Further, when the first lens 3 and the second lens 4 are separate members, the first lens 3 and the second lens 4 may be arranged separately in the horizontal direction.

[0071] (Modification example of the second lens 4) Hereinafter, various modification examples of the second lens 4 will be described.

[0072] (First modification example of the second lens 4) FIG. 11 is a schematic cross-sectional view showing a first modification of the second lens 4. FIG. 11 shows a cross-section including the second optical axis 4C of the second lens 4 in the vicinity of the second incident surface 41 of the second lens 4.

[0073] The second lens 4 according to the first modification is located between the second incident surface 41 and the second exit surface 42 shown in FIG. 10, and includes a total reflection portion 43 that totally reflects the light from the third light emitting portion 20 incident on the second incident surface 41, which is different from the second lens 4 in the above-described first embodiment. The total reflection portion 43 is located below the lowest portion of the first incident surface 35 of the first lens 3. The total reflection portion 43 is inclined so as to totally reflect the light from the third light emitting portion 20 incident on the second incident surface 41. In the example shown in FIG. 11, the total reflection portion 43 includes a curved surface. As a result, in the second lens 4 according to the first modification, the cross-sectional area orthogonal to the second optical axis 4C becomes non-linearly smaller as it approaches the third light emitting portion 20.

[0074] Since the second lens 4 according to the first modification includes the total reflection portion 43, the light from the third light emitting portion 20 incident on the second incident surface 41 is less likely to leak from the side surface of the second lens 4. As a result, it is possible to reduce the light from the third light emitting portion 20 incident on the second incident surface 41 from leaking from the side surface of the second lens 4 and entering the first incident surface 35 of the first lens 3. As a result, it is possible to reduce stray light caused by the light from the third light emitting portion 20 entering the first lens 3.

[0075] Also, by adjusting the inclination angle of the total reflection portion 43, as shown in FIG. 4, in the irradiation surface S irradiated with the light emitted from the light emitting module 100, the position of the second irradiation region Ar2 of the light L2 from the third light emitting portion 20 can be made closer to the first irradiation region Ar1 of the light L1 from the first light emitting portion 10-1. As a result, the light amount of the light L1 from the first light emitting portion 10-1 can be assisted by the light amount of the light L2 from the third light emitting portion 20, and the light amount of the telescopic irradiation by the light emitting module 100 can be increased.

[0076] (Second Modification of the Second Lens 4) FIG. 12 is a schematic cross-sectional view showing a second modification of the second lens 4. FIG. 12 shows a cross-section including the second optical axis 4C of the second lens 4 in the vicinity of the second exit surface 42 of the second lens 4.

[0077] As shown in FIG. 12, the second lens 4 according to the second modification is different from the second lens 4 in the above-described first embodiment in that the second exit surface 42 includes a plurality of irregularities 44. The plurality of irregularities 44 includes any one of a plurality of concave portions, a plurality of convex portions, or both a plurality of concave portions and a plurality of convex portions. The plurality of irregularities 44 can include a Fresnel shape or the like.

[0078] Since the second exit surface 42 includes the plurality of irregularities 44, the light emitted from the second lens 4 is diffused by the plurality of irregularities 44. Thereby, the unevenness of the illuminance of the light emitted from the second lens 4 can be reduced. Further, since the second exit surface 42 includes the plurality of irregularities 44, it becomes difficult to visually recognize the inside of the light-emitting module 100 through the second exit surface 42, so that the appearance beauty of the light-emitting module 100 can be improved.

[0079] (Third Modification of the Second Lens 4) FIG. 13 is a schematic cross-sectional view showing a third modification of the second lens 4. FIG. 13 shows a cross-section including the second optical axis 4C of the second lens 4 in the vicinity of the second exit surface 42 of the second lens 4.

[0080] As shown in FIG. 13, the second lens 4 according to the second modification is different from the second lens 4 in the above-described first embodiment in that the second exit surface 42 includes a convex surface 45. The convex surface 45 is a curved surface that protrudes on the side opposite to the side where the third light-emitting portion 20 is located.

[0081] Since the second exit surface 42 includes the convex surface 45, the light distribution of the light emitted from the second lens 4 can be controlled using the radius of curvature of the convex surface 45. Thereby, the degree of freedom in controlling the light distribution of the light emitted from the second lens 4 can be increased. The convex surface 45 may be, for example, a plano-convex lens surface or a cylindrical lens surface. In the second lens 4 shown in FIG. 13, for example, among the light L2 emitted from the third light-emitting unit 20, the light passing through the second optical axis 4C has the highest emission intensity.

[0082] (Fourth modification example of the second lens 4) FIG. 14 is a schematic cross-sectional view showing a fourth modification example of the second lens 4. FIG. 14 shows a cross-section including the second optical axis 4C of the second lens 4 in the vicinity of the second exit surface 42 of the second lens 4.

[0083] As shown in FIG. 14, the second lens 4 according to the second modification example is different from the second lens 4 in the above-described first embodiment in that the second exit surface 42 includes a concave surface 46. The concave surface 46 is a curved surface that is recessed toward the side where the third light-emitting unit 20 is located. The concave surface 46 is, for example, a plano-concave lens surface.

[0084] Since the second exit surface 42 includes the concave surface 46, the light distribution of the light emitted from the second lens 4 can be controlled using the radius of curvature of the concave surface 46. Thereby, the degree of freedom in controlling the light distribution of the light emitted from the second lens 4 can be increased.

[0085] [Modification example] Next, various modification examples of the light-emitting module according to the embodiment will be described. Note that the same names and reference numerals as those in the embodiment already described indicate the same or similar members or configurations, and detailed descriptions will be omitted as appropriate.

[0086] <Light-emitting module according to the first modification example> FIG. 15 is a schematic cross-sectional view showing an example of a light-emitting module 100a according to the first modification example. The top view of the light-emitting module 100a is the same as that of the light-emitting module 100 shown in FIG. 1. FIG. 15 shows a cross-section corresponding to the line II-II in FIG. 1.

[0087] In the light-emitting module 100a, the first light-emitting part 10-1 includes a first phosphor layer, each of the second light-emitting parts 10-2 to 10-9 includes a second phosphor layer, and the third light-emitting part 20 includes a third phosphor layer. The phosphor contained in the third phosphor layer is different from the phosphor contained in the first phosphor layer. The first light-emitting part 10-1 and the third light-emitting part 20 can be driven individually. In the light-emitting module 100a, the above points are different from the light-emitting module 100 according to the above-described embodiment.

[0088] In the example shown in FIG. 15, the first phosphor layer is included in the wavelength conversion member 14 provided in the first light-emitting part 10-1 shown in FIG. 5. The second phosphor layer is included in the wavelength conversion member 14 provided in each of the second light-emitting parts 10-2 to 10-9. The third phosphor layer is included in the wavelength conversion member 14 provided in the third light-emitting part 20. In the first light-emitting part 10-1 and the second light-emitting parts 10-2 to 10-9, for example, white light can be irradiated by mixing the light emitted from each of the first phosphor layer and the second phosphor layer and the light emitted from the light-emitting element 12. In the third light-emitting part 20, for example, amber light can be irradiated by mixing the light emitted from the third phosphor layer and the light emitted from the light-emitting element 12.

[0089] For example, when performing imaging by focusing on a person with an imaging device using the first irradiation mode of the light-emitting module, it is preferable to make the color temperature of the light irradiated to the person as the subject close to the color temperature of the ambient light. In the light-emitting module 100a, by adjusting the balance of the current values input to each of the first light-emitting part 10-1 and the third light-emitting part 20 and color-adjusting the light from the first light-emitting part 10-1 and the light from the third light-emitting part 20, light with a desired color temperature can be irradiated. Since light obtained by color-adjusting the light from the first light-emitting part 10-1 and the light from the third light-emitting part 20 can be irradiated, the color temperature of the light irradiated from the light-emitting module 100a to the person can be made close to the color temperature of the ambient light. Thereby, the imaging device can perform imaging using irradiation light of natural colors.

[0090] <Light-Emitting Module According to the Second Modified Example> Referring to FIGS. 16 to 18, the light-emitting module according to the second modification will be described. FIG. 16 is a schematic cross-sectional view showing an example of the light-emitting module 100b according to the second modification. The top view of the light-emitting module 100b is the same as that of the light-emitting module 100 shown in FIG. 1, except that the third light-emitting unit 20-2 and the second lens 4-2 are included. FIG. 16 shows a cross-section corresponding to the line II-II in FIG. 1. FIG. 17 is a schematic top view showing a first example of the second light source 2 included in the light-emitting module 100b. FIG. 18 is a schematic top view showing a second example of the second light source 2 included in the light-emitting module 100b. Note that FIGS. 17 and 18 show a state in which the first lens 3, the second lens 4, and the light-transmissive member 5 are removed in the light-emitting module 100b.

[0091] In the light-emitting module 100b, the second light source 2 includes a plurality of third light-emitting units 20 that are symmetrically arranged around the first light source 1 in a top view. The light-emitting module 100b includes at least one second lens disposed corresponding to the plurality of third light-emitting units 20 above the plurality of third light-emitting units 20. In the light-emitting module 100b, the above points are different from those of the light-emitting module 100 according to the above-described embodiment.

[0092] In the example shown in FIGS. 16 and 17, the second light source 2 includes two third light emitting portions 20 that are arranged around the first light source 1 in a top view. The two third light emitting portions 20 include a third light emitting portion 20-1 and a third light emitting portion 20-2. The light emitting module 100b includes a second lens 4-1 that is arranged corresponding to the third light emitting portion 20-1 above the third light emitting portion 20-1, and a second lens 4-2 that is arranged corresponding to the third light emitting portion 20-2 above the third light emitting portion 20-2. In the example shown in FIG. 17, in order to indicate that the third light emitting portion 20-1 and the third light emitting portion 20-2 are included in the two third light emitting portions 20, the reference numerals of the third light emitting portion 20-1 and the third light emitting portion 20 are written together, and the reference numerals of the third light emitting portion 20-2 and the third light emitting portion 20 are written together. The second lens 4-1 and the second lens 4-2 may have the same shape or different shapes. When the second lens 4-1 and the second lens 4-2 have different shapes, for example, the second lens 4-1 has a shape corresponding to the third light emitting portion 20-1, and the second lens 4-2 has a shape corresponding to the third light emitting portion 20-2.

[0093] In the example shown in FIG. 18, the second light source 2 includes four third light emitting portions 20 that are arranged around the first light source 1 in a top view. The four third light emitting portions 20 include a third light emitting portion 20-1, a third light emitting portion 20-2, a third light emitting portion 20-3, and a third light emitting portion 20-4. The light emitting module 100b can include at least one second lens 4 that is arranged corresponding to the four third light emitting portions 20 above the four third light emitting portions 20. In the example shown in FIG. 18, in order to indicate that the third light emitting portions 20-1 to 20-4 are included in the four third light emitting portions 20, the reference numerals of the third light emitting portion 20-1 and the third light emitting portion 20 are written together, the reference numerals of the third light emitting portion 20-2 and the third light emitting portion 20 are written together, the reference numerals of the third light emitting portion 20-3 and the third light emitting portion 20 are written together, and the reference numerals of the third light emitting portion 20-4 and the third light emitting portion 20 are written together. Each second lens 4 may have the same shape or different shapes.

[0094] The plurality of second lenses 4 do not necessarily have to be arranged in a one-to-one correspondence with the plurality of third light-emitting units 20. For example, the second lens 4 may be a single annular lens disposed above each of the plurality of third light-emitting units 20 in a top view.

[0095] In the light-emitting module 100b, by providing a plurality of third light-emitting units 20 arranged symmetrically about the first light source 1, the unevenness in the illuminance distribution of the light emitted from the third light-emitting units 20 can be reduced on the irradiation surface S irradiated with the light emitted from the light-emitting module 100b. Also, on the irradiation surface S, it becomes easier to reduce the variation in the stray light distribution in the light from the first light source 1. Furthermore, since the arrangement of the plurality of third light-emitting units 20 viewed through the first lens 3 is symmetric about the first light source 1, the aesthetic appearance of the light-emitting module 100b can be improved.

[0096] <Light-emitting module according to the third modification> FIG. 19 is a schematic cross-sectional view showing an example of a light-emitting module 100c according to the third modification. The top view of the light-emitting module 100c is the same as that of the light-emitting module 100 shown in FIG. 1. FIG. 19 shows a cross-section corresponding to the line II-II in FIG. 1.

[0097] In the light-emitting module 100c, it is different from the light-emitting module 100 according to the above-described embodiment in that a reflective film 16 is provided on the side surface of the second lens 4. A metal film or the like can be used for the reflective film 16.

[0098] In the light-emitting module 100c, the light emitted from the third light-emitting unit 20 and guided inside the second lens 4 is reflected by the reflection film 16, thereby reducing the leakage of the light guided inside the second lens 4 to the first lens 3 side. As a result, it is possible to reduce stray light generated when the light guided inside the second lens 4 leaks out of the second lens 4 and is incident on the first incident surface 35 of the first lens 3. Further, by reflecting the light emitted from the first light source 1 that has not been incident on the first incident surface 35 of the first lens 3 with the reflection film 16, it becomes easier to increase the amount of light of the irradiation light of the first light source 1 on the irradiation surface S. Note that the reflection film 16 may be provided on the entire side surface of the second lens 4, or may be provided only on the side surface on the first lens 3 side of the entire side surface of the second lens 4.

[0099] As described above, the preferred embodiments have been described in detail. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope described in the claims.

[0100] The ordinal numbers, quantities, and other numbers used in the description of the embodiments are all examples for specifically explaining the technology of the present disclosure, and the present disclosure is not limited to the exemplified numbers. Further, the connection relationship between the components is an example for specifically explaining the technology of the present disclosure, and the present disclosure is not limited to this connection relationship for realizing the functions of the present disclosure.

[0101] The light-emitting module of the present disclosure can reduce the temperature of the light-emitting unit exceeding the allowable value of the junction temperature when emitting light, and can increase the amount of light on the irradiation surface. Therefore, it can be suitably used as lighting, a camera flash, an in-vehicle headlight, etc. However, the light-emitting module of the present disclosure is not limited to the applications shown above.

[0102] Aspects of the present disclosure are, for example, as follows. <Item 1> A light-emitting module includes a first light source and a second light source arranged horizontally spaced apart from the first light source. The first light source includes a plurality of light-emitting parts including a first light-emitting part and a plurality of second light-emitting parts arranged around the first light-emitting part, and a light-shielding member arranged between the plurality of light-emitting parts and exposing the light-emitting surfaces of the plurality of light-emitting parts respectively. The second light source includes a third light-emitting part connected in parallel with the first light-emitting part. On an irradiation surface, at least a part of the light from the first light-emitting part and the light from the third light-emitting part overlap with each other. <Item 2> The light-emitting module according to <Item 1> further includes a first lens arranged above the first light source. The first lens includes a first incident surface on which the light from the first light source is incident and which is convex in a direction approaching the first light source, and a first exit surface from which the light from the first light source exits. In a top view, the first incident surface overlaps with the first light source and does not overlap with the second light source. <Item 3> The light-emitting module according to <Item 2> further includes a second lens arranged above the third light-emitting part, facing the light-emitting surface of the third light-emitting part, and having a second incident surface spaced apart from the first incident surface in a top view. <Item 4> A first optical axis of the first lens passing through the center of the first incident surface intersects the first light-emitting part. A second optical axis of the second lens passing through the center of the second incident surface intersects the third light-emitting part. The second optical axis is parallel to the first optical axis. The light-emitting module according to <Item 3>. <Item 5> The second lens includes a second exit surface from which the light from the third light-emitting part incident on the second incident surface exits. The second incident surface and the second exit surface are flat surfaces parallel to each other. The light-emitting module according to <Item 3> or <Item 4>. <Item 6> The second incident surface is located below the first incident surface, and the second exit surface is located above the first incident surface. The light-emitting module according to <Item 5>. <Item 7> The second lens is located between the second incident surface and the second exit surface, and includes a total reflection portion that totally reflects the light from the third light emitting portion incident on the second incident surface, and is the light emitting module according to <Item 6>. <Item 8> The first lens and the second lens are an integral member, and are the light emitting module according to any one of <Items 3> to <Item 7>. <Item 9> The second light source includes a plurality of the third light emitting portions arranged symmetrically about the first light source in a top view, and at least one of the second lenses arranged corresponding to the plurality of the third light emitting portions above the plurality of the third light emitting portions, and is the light emitting module according to any one of <Items 3> to <Item 8>. <Item 10> The current value input to the third light emitting portion is equal to or less than the current value input to the first light emitting portion, and is the light emitting module according to any one of <Items 1> to <Item 9>. <Item 11> A first irradiation mode in which only the first light emitting portion and the third light emitting portion emit light, and a second irradiation mode in which each of the first light emitting portion, the second light emitting portion, and the third light emitting portion emits light are switchable, and the light distribution angle of the light emitting module in the first irradiation mode is smaller than the light distribution angle of the light emitting module in the second irradiation mode, and is the light emitting module according to any one of <Items 1> to <Item 10>. <Item 12> It is for flash, and is the light emitting module according to any one of <Items 1> to <Item 11>. <Item 13> A first light source including a first light emitting portion and a plurality of second light emitting portions arranged around the first light emitting portion, and a second light source arranged horizontally spaced apart from the first light source and including a third light emitting portion, on the irradiation surface, at least a part of the light from the first light emitting portion and the light from the third light emitting portion overlap, a first irradiation mode in which only the first light emitting portion and the third light emitting portion emit light, and a second irradiation mode in which each of the first light emitting portion, the second light emitting portion, and the third light emitting portion emits light are switchable, and the light distribution angle in the first irradiation mode is smaller than the light distribution angle in the second irradiation mode, and is a light emitting module. <Item 14> The light emitting module according to <Item 13>, further comprising a first lens disposed above the first light source, wherein the first lens has a first incident surface on which light from the first light source is incident and which is convex in a direction approaching the first light source, and a first emission surface from which the light from the first light source is emitted, and the first incident surface overlaps with the first light source and does not overlap with the second light source in a top view. <Item 15> The light emitting module according to <Item 14>, further comprising a second lens disposed above the third light emitting portion, facing the light emitting surface of the third light emitting portion, and having a second incident surface spaced apart from the first incident surface in a top view. <Item 16> The light emitting module according to <Item 15>, wherein a first optical axis of the first lens passing through the center of the first incident surface intersects the first light emitting portion, a second optical axis of the second lens passing through the center of the second incident surface intersects the third light emitting portion, and the second optical axis is parallel to the first optical axis. <Item 17> The light emitting module according to <Item 15> or <Item 16>, wherein the first lens and the second lens are an integral member. <Item 18> The first light emitting portion includes a first phosphor layer, the second light emitting portion includes a second phosphor layer, the third light emitting portion includes a third phosphor layer, the phosphor contained in the third phosphor layer is different from the phosphor contained in the first phosphor layer, and the first light emitting portion and the third light emitting portion can be individually driven. The light emitting module according to any one of <Item 13> to <Item 17>.

Description of Reference Numerals

[0103] 1 First light source 10-1 First light emitting portion 10-2 to 10-9 Second light emitting portions 11 Light emitting surface 12 Light emitting element 13 Electrode 14 Wavelength conversion member 15 Light shielding member 16 Reflective film 2 Second light source 20, 20-1 to 20-4 Third light emitting portions 21 Third light-emitting surface 3 First lens 3C First optical axis 31 First exit surface 32 Bottom surface 35 First incident surface 4 Second lens 4C Second optical axis 41 Second incident surface 42 Second exit surface 43 Total reflection part 44 Concavo-convex 45 Convex surface 46 Concave surface 5 Translucent member 51 Upper part 510 Lower surface 52 Cylindrical part 53 Leg part 54 First joining member 6 Wiring board 61 Second joining member 62 Wiring 63 Conductive member 100, 100a, 100b, 100c Light-emitting module Ar1 First irradiation region Ar2 Second irradiation region Ar3 Third irradiation region L1 Light from the first light-emitting part L2 Light from the third light-emitting part S Irradiation surface

Claims

1. A first light source; A second light source is disposed horizontally apart from the first light source, The first light source is A plurality of light emitting units including a first light emitting unit and a plurality of second light emitting units arranged around the first light emitting unit; a light-shielding member disposed between the plurality of light-emitting units and exposing a light-emitting surface of each of the plurality of light-emitting units; The second light source includes a third light emitting unit connected in parallel to the first light emitting unit, A light emitting module, wherein the light from the first light emitting unit and the light from the third light emitting unit at least partially overlap on an irradiation surface.

2. Further comprising a first lens disposed above the first light source; the first lens includes a first entrance surface into which light from the first light source is incident and which is convex in a direction approaching the first light source, and a first exit surface from which the light from the first light source is exited, The light emitting module according to claim 1 , wherein the first incident surface overlaps with the first light source but does not overlap with the second light source in a top view.

3. The light emitting module according to claim 2 , further comprising a second lens arranged above the third light emitting section, facing the light emitting surface of the third light emitting section, and having a second incident surface separated from the first incident surface in a top view.

4. a first optical axis of the first lens passing through a center of the first entrance surface intersects with the first light emitting portion; a second optical axis of the second lens passing through a center of the second entrance surface intersects with the third light-emitting portion, The light emitting module according to claim 3 , wherein the second optical axis is parallel to the first optical axis.

5. the second lens includes a second exit surface through which light from the third light-emitting unit that is incident on the second entrance surface is emitted, The light emitting module according to claim 3 , wherein the second entrance surface and the second exit surface are flat surfaces parallel to each other.

6. The light emitting module according to claim 5 , wherein the second entrance surface is located below the first entrance surface, and the second exit surface is located above the first entrance surface.

7. The light-emitting module according to claim 6 , wherein the second lens is located between the second incident surface and the second exit surface and includes a total reflection portion that totally reflects light from the third light-emitting portion that is incident on the second incident surface.

8. The light emitting module according to claim 3 , wherein the first lens and the second lens are an integral member.

9. The second light source includes a plurality of the third light-emitting units that are arranged symmetrically around the first light source when viewed from above, The light emitting module according to claim 3 , further comprising at least one of the second lenses arranged above a plurality of the third light emitting sections in correspondence with the plurality of the third light emitting sections.

10. The light emitting module according to claim 1 , wherein a value of a current supplied to the third light emitting unit is equal to or less than a value of a current supplied to the first light emitting unit.

11. a first irradiation mode in which only the first light-emitting unit and the third light-emitting unit are caused to emit light; a second illumination mode in which each of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is caused to emit light; The light emitting module according to claim 1 , wherein a light distribution angle of the light emitting module in the first irradiation mode is smaller than a light distribution angle of the light emitting module in the second irradiation mode.

12. The light emitting module according to claim 1 , which is for use as a flash.

13. A first light source including a first light emitting unit and a plurality of second light emitting units arranged around the first light emitting unit; a second light source disposed horizontally apart from the first light source and including a third light emitting portion; Equipped with On an irradiated surface, the light from the first light-emitting unit and the light from the third light-emitting unit at least partially overlap each other, a first irradiation mode in which only the first light-emitting unit and the third light-emitting unit are caused to emit light; a second illumination mode in which each of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is caused to emit light; A light-emitting module, wherein a light distribution angle in the first irradiation mode is smaller than a light distribution angle in the second irradiation mode.

14. Further comprising a first lens disposed above the first light source; the first lens includes a first entrance surface into which light from the first light source is incident and which is convex in a direction approaching the first light source, and a first exit surface from which the light from the first light source is exited, The light emitting module according to claim 13 , wherein the first incident surface overlaps with the first light source but does not overlap with the second light source in a top view.

15. The light emitting module according to claim 14 , further comprising a second lens arranged above the third light emitting section, facing the light emitting surface of the third light emitting section, and having a second incident surface separated from the first incident surface in a top view.

16. a first optical axis of the first lens passing through a center of the first entrance surface intersects with the first light emitting portion; a second optical axis of the second lens passing through a center of the second entrance surface intersects with the third light-emitting portion, The light emitting module according to claim 15 , wherein the second optical axis is parallel to the first optical axis.

17. The light emitting module according to claim 15 , wherein the first lens and the second lens are an integral member.

18. The first light-emitting portion includes a first phosphor layer, The second light-emitting portion includes a second phosphor layer, the third light-emitting section includes a third phosphor layer, The phosphor contained in the third phosphor layer is different from the phosphor contained in the first phosphor layer, The first light-emitting unit and the third light-emitting unit can be driven individually. The light emitting module according to claim 13.

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