Light Emitting Module

Abstract

To provide a light emitting module that can change the chromaticity of light to be emitted.SOLUTION: A light emitting element 100 comprises: a first light source 110 comprising a first light emitting element 111 for emitting first light L1, and a first wavelength conversion member 112 for converting the wavelength of a portion of the first light L1 to emit second light L2, and for emitting light La including the first light L1 and the second light L2; a first lens 120 on which the light emitted from the first light source is incident; a drive part 150 capable of changing the chromaticity of light Lc to be emitted from the first lens by changing a distance between the first lens and the first light source; a second light source 130 for emitting light Ld whose chromaticity is different from the chromaticity of the light emitted from the first light source; and a second lens 140 on which the light emitted from the second light source is incident.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The embodiment relates to a light emitting module. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a light emitting module is known that includes a light source having a light emitting element and a wavelength conversion member, and a lens onto which the light emitted from the light source is incident. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-4477 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the embodiments is to provide a light-emitting module capable of changing the chromaticity of emitted light. [Means for solving the problem]

[0005] The light-emitting module according to the embodiment has a first light-emitting element that emits a first light, and a first wavelength conversion member that converts the wavelength of a portion of the first light to emit a second light, and is equipped with a first light source that emits light including the first light and the second light, a first lens into which the light emitted from the first light source is incident, a drive unit that changes the distance between the first lens and the first light source, a second light source that emits light having a chromaticity different from the chromaticity of the light emitted from the first light source, and a second lens into which the light emitted from the second light source is incident, and by changing the distance between the first lens and the first light source, the amount of the second light emitted from the first lens is changed. Effect of the Invention

[0006] According to the embodiment, it is possible to realize a light emitting module capable of changing the chromaticity of emitted light. [Brief description of the drawings]

[0007] [Figure 1] 1 is a cross-sectional view illustrating a schematic configuration of a light-emitting module according to a first embodiment. [Figure 2A] 3 is a cross-sectional view illustrating a schematic configuration of a first light source in the light-emitting module according to the first embodiment. FIG. [Figure 2B] 4 is a cross-sectional view illustrating a second light source in the light-emitting module according to the first embodiment. FIG. [Diagram 3] 3 is a cross-sectional view illustrating a schematic view of a first lens and a second lens in the light-emitting module according to the first embodiment. FIG. [Figure 4A] FIG. 2 is a top view illustrating an example of a first lens and a second lens. [Figure 4B] FIG. 2 is a top view illustrating an example of a first lens and a second lens. [Diagram 5] 4 is a schematic diagram showing a trajectory of light when a first lens and a second lens are disposed at a first position. FIG. [Figure 6] 4 is a schematic diagram showing a trajectory of light when the first lens and the second lens are disposed at a second position. FIG. [Figure 7] 2 is a CIE1931 chromaticity diagram plotting the color gamut of light emitted from the light emitting module according to the first embodiment. [Figure 8] 1 is a CIE 1931 chromaticity diagram plotting the color gamut of light emitted from a light-emitting module according to a reference example. [Figure 9A] FIG. 1 is an image diagram of a photograph taken without using a flash light source. [Figure 9B] FIG. 1 is an image diagram of a photograph taken using a flash light source with a different color temperature from the ambient light. [Figure 9C] FIG. 1 is an image diagram of a photograph taken using a flash light source with a color temperature close to that of the ambient light. [Figure 10] FIG. 11 is a cross-sectional view illustrating a light-emitting module according to a second embodiment. [Figure 11A] FIG. 2 is a top view illustrating an example of a first lens and a second lens. [Figure 11B] FIG. 2 is a top view illustrating an example of a first lens and a second lens. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] For convenience of explanation, the present specification employs an XYZ Cartesian coordinate system. For example, as shown in FIG. 1, the direction from the first light source 110 to the first lens 120 is referred to as the "Z direction". The Z direction is also referred to as the "upward direction". The opposite direction to the Z direction is referred to as the "downward direction". Moreover, a direction perpendicular to the Z direction is referred to as the "X direction". A direction perpendicular to the Z direction and the X direction is referred to as the "Y direction". In the present specification, an end view showing only a cut surface may be used as a cross-sectional view.

[0009] <First embodiment> First, the first embodiment will be described. FIG. 1 is an end view showing a light emitting module according to the present embodiment. FIG. 2A is an end view showing a first light source included in the light emitting module according to this embodiment. FIG. 2B is an end view showing a second light source included in the light emitting module according to the present embodiment. FIG. 3 is an end view showing a first lens and a second lens in the light emitting module according to the present embodiment. 1, the light emitting module 100 according to this embodiment includes a first light source 110, a first lens 120, a second light source 130, a second lens 140, and a driving unit 150. As shown in Fig. 3, the first lens 120 and the second lens 140 are, for example, integral with each other and made of a single light-transmitting member T. Note that the first lens 120 and the second lens 140 may be separate bodies.

[0010] 1, the first light source 110 includes a first light emitting element 111 that emits a first light L1, and a first wavelength conversion member 112 that converts the wavelength of a part of the first light L1 and emits a second light L2. The first light source 110 emits light La including the first light L1 and the second light L2. The light La emitted from the first light source 110 is incident on the first lens 120.

[0011] The second light source 130 emits light Lb with a chromaticity different from that of the light La emitted from the first light source 110. "The chromaticity of the light Lb is different from that of the light La" means that the chromaticities measured are different when the first light source 110 and the second light source 130 are turned on individually. For example, in this embodiment, the chromaticity of the light La measured on an axis C1 that passes through the center of the first light source 110 in a top view and is parallel to the Z direction is different from the chromaticity of the light Lb measured on an axis C2 that passes through the center of the second light source 130 in a top view and is parallel to the Z direction. The light Lb emitted from the second light source 130 is incident on the second lens 140.

[0012] The driving unit 150 changes the distance between the first lens 120 and the first light source 110. This allows the light emitting module 100 to change the amount of the second light L2 emitted from the first lens 120. The amount of the second light L2 emitted from the first lens 120 is changed, and thus the light emitting module 100 can change the chromaticity of the light Lc emitted from the first lens 120. That is, the light emitting module 100 can change the chromaticity of the light Lc emitted from the first lens 120 by changing the distance between the first lens 120 and the first light source 110. Here, the "distance between the first lens 120 and the first light source 110" means the shortest distance between the surfaces of the first lens 120 and the first light source 110 facing each other in the Z direction, and means, for example, the shortest distance between the surfaces of the first lens 120 and the first light source 110 facing each other on the axis C1.

[0013] The light emitting module 100 may further include a substrate 160, a diffusion plate 170, and a control unit 180. The first light source 110 and the second light source 130 are placed on the substrate 160. The diffusion plate 170 diffuses the light Lc emitted from the first lens 120 and the light Ld emitted from the second lens 140 and emits them to the outside. The control unit 180 controls the operations of the first light source 110, the second light source 130, and the drive unit 150. Each unit of the light emitting module 100 will be described in detail below.

[0014] <Substrate> The substrate 160 is, for example, a wiring substrate in which wiring connected to the first light source 110 and the second light source 130 is provided on an insulating base such as a resin.

[0015] The surface of the substrate 160 includes an upper surface 161 and a lower surface 162 located on the opposite side of the upper surface 161. The upper surface 161 and the lower surface 162 are, for example, flat surfaces and are approximately parallel to the X direction and the Y direction. The first light source 110 and the second light source 130 are placed on the upper surface 161. The first light source 110 and the second light source 130 are arranged in the X direction. The light emitting module 100 according to this embodiment includes two light sources, the first light source 110 and the second light source 130. However, the light emitting module 100 may include three or more light sources that emit light of different chromaticities. Also, the light emitting module 100 may include a plurality of the first light source 110 and / or the second light source 130.

[0016] <1st light source> 2A, the first light source 110 includes a first light emitting element 111, a first wavelength conversion member 112, a light reflecting member 113, a light guiding member 114, and a light transmissive member 115. The first light source 110 emits light including a first light L1 emitted from the first light emitting element 111 and a second light L2 obtained by wavelength conversion of a part of the first light L1 by the first wavelength conversion member 112.

[0017] The first light emitting element 111 has, for example, a semiconductor laminate 111a including a light emitting layer, and positive and negative electrodes 111b and 111c. The first light emitting element 111 is, for example, a light emitting diode, and emits a first light L1. The first light emitting element 111 has, for example, In x Al y Ga 1-x-y N (0≦x, 0≦y, x+y≦1) and can emit visible light or ultraviolet light.

[0018] The first light L1 is, for example, blue light. The chromaticity of the first light L1 is, for example, 0.11≦x≦0.15 and 0.04≦y≦0.11 in the xy chromaticity coordinate system of the CIE 1931 chromaticity diagram, and is within the range surrounded by the spectrum locus. Hereinafter, the xy chromaticity coordinate system of the CIE 1931 chromaticity diagram will be simply referred to as the "chromaticity coordinate system."

[0019] The first wavelength conversion member 112 is disposed on the upper surface, which is the main light emitting surface, of the first light emitting element 111. The first wavelength conversion member 112 can absorb the first light L1 emitted from the first light emitting element and emit the second light L2 having a wavelength different from the wavelength of the first light. The first wavelength conversion member 112 can transmit a part of the first light L1 without wavelength conversion. For example, in the emission spectrum of the first light source, the emission peak intensity of the second light L2 is 1 / 3 or more and 1 / 1 or less of the emission peak intensity of the first light. The second light L2 is, for example, yellow light. The chromaticity of the second light L2 is, for example, 0.35≦x≦0.50 and 0.50≦y≦0.65 in the chromaticity coordinate system, and is within a range surrounded by the spectrum locus.

[0020] The first wavelength conversion member 112 includes, for example, a translucent material as a base material and a particulate phosphor as a wavelength conversion substance. As the translucent material, inorganic materials such as glass and ceramics, and resins such as silicone resin, modified silicone resin, epoxy resin, and modified epoxy resin can be used. As the phosphor, an yttrium-aluminum-garnet phosphor (for example, Y3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet phosphors (e.g., Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet phosphors (e.g., Tb3(Al,Ga)5O 12 :Ce), CCA phosphors (e.g., Ca 10 (PO4)6Cl2:Eu), SAE phosphors (e.g., Sr4Al 14 O 25 :Eu), chlorosilicate phosphors (e.g., Ca8MgSi4O 16Cl2:Eu), β-sialon phosphors (e.g., (Si,Al)3(O,N)4:Eu), α-sialon phosphors (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu), SLA phosphor (e.g., SrLiAl3N4:Eu), CASN phosphor (e.g., CaAlSiN3:Eu) or SCASN phosphor (e.g., (Sr,Ca)AlSiN3:Eu), nitride phosphors such as KSF phosphor (e.g., K2SiF6:Mn), KSAF phosphor (e.g., K2(Si,Al)F6:Mn) or MGF phosphor (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), fluoride phosphors such as KSF phosphor (e.g., K2SiF6:Mn), KSAF phosphor (e.g., K2(Si,Al)F6:Mn) or MGF phosphor (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), phosphors having a perovskite structure (e.g., CsPb(F,Cl,Br,I)3), or quantum dot phosphors (e.g., CdSe, InP, AgInS2 or AgInSe2), etc. can be used. For example, a phosphor that absorbs blue light and emits yellow light is a YAG phosphor.

[0021] In top view, the first wavelength conversion member 112 covers the first light emitting element 111 and extends to an area outside the side surfaces of the first light emitting element 111. The first wavelength conversion member 112 is, for example, plate-shaped. The surface of the first wavelength conversion member 112 includes, for example, a lower surface 112a, an upper surface 112b, and a side surface 112c.

[0022] The first wavelength conversion member 112 is disposed such that the lower surface 112a faces the main light emitting surface of the first light emitting element 111 (i.e., the upper surface of the first light emitting element 111). The upper surface 112b of the first wavelength conversion member 112 is located on the opposite side to the lower surface 112a. The lower surface 112a and the upper surface 112b are, for example, flat surfaces and are approximately parallel to each other. The side surface 112c is located between the lower surface 112a and the upper surface 112b. The lower surface 112a of the first wavelength conversion member 112 covers the main light emitting surface of the first light emitting element 111 and extends to an area outside the side surface of the first light emitting element 111 in a top view.

[0023] It is preferable that the first wavelength conversion member 112 has a constant thickness (i.e., dimension in the Z direction). In other words, it is preferable that the thickness of the first wavelength conversion member 112 is approximately the same at each position in the X direction and the Y direction. However, the thickness of the first wavelength conversion member 112 does not necessarily have to be constant, and the first wavelength conversion member 112 may have a thickness that differs partially. Note that in this specification, "constant thickness" or "same thickness" does not mean only that the thickness is strictly constant or the same, but also includes variations in the manufacturing process, and it is sufficient that the thickness is substantially constant or the same.

[0024] The light guiding member 114 covers the side surface of the first light emitting element 111. The light guiding member 114 extends from the side surface of the first light emitting element 111 and covers the lower surface 112a of the first wavelength conversion member. The light guiding member 114 is translucent. The light guiding member 114 may be disposed between the first wavelength conversion member 112 and the first light emitting element 111 as an adhesive for bonding the first wavelength conversion member 112 and the first light emitting element 111. The material of the light guiding member 114 can be a translucent resin such as a silicone resin.

[0025] The light reflecting member 113 surrounds the side surface of the first light emitting element 111. Specifically, the light reflecting member 113 covers the light guiding member 114 that covers the side surface of the light emitting element 111. The inner side surface of the light reflecting member 113 surrounding the first light emitting element 111 is inclined with respect to the Z direction so as to move away from the first light emitting element 111 toward the Z direction. The first wavelength conversion member 112 covers the upper surfaces of the first light emitting element 111 and the light reflecting member 113. The light reflecting member may cover the side surface of the first wavelength conversion member 112 and the side surface of the translucent member 115. In this case, the light reflecting member 113 constitutes a part of the upper surface of the first light source 110.

[0026] The light reflecting member 113 is, for example, a resin containing a light reflecting substance. Examples of the resin include those exemplified as the resin used for the first wavelength conversion member 112. Among them, it is preferable to use a silicone resin having excellent heat resistance and light resistance.

[0027] As the light-reflecting material, it is preferable to use a material that does not easily absorb light from the light-emitting element and has a large refractive index difference with respect to the resin material. Examples of such light-reflecting materials include titanium oxide, zinc oxide, silicon oxide, zirconium oxide, yttrium oxide, yttria-stabilized zirconia, potassium titanate, aluminum oxide, aluminum nitride, boron nitride, and mullite. These light-reflecting materials can be contained in the resin in the range of 5% by weight to 90% by weight.

[0028] The light-transmitting member 115 covers the upper surface of the first wavelength conversion member. The light-transmitting member 115 transmits 60% or more of the first light L1 and the second light L2, and preferably transmits 90% or more. The material of the light-transmitting member 115 may be a light-transmitting resin. Examples of the light-transmitting resin include the resins exemplified for use in the first wavelength conversion member 112.

[0029] The first wavelength conversion member 112, the light guide member 114, and the light transmitting member 115 may contain a light diffusing material. Examples of the light diffusing material include fine particles of silicon oxide, titanium oxide, aluminum oxide, zinc oxide, or the like.

[0030] The light La emitted from the first light source 110 includes, for example, a front light La1 emitted upward from the first light source 110 and a side light La2 emitted so as to spread laterally from the first light source 110. For example, the front light La1 is light emitted from the vicinity of the center of the upper surface 110a of the first light source 110, and the side light La2 is light emitted from the vicinity of the periphery and / or the side of the upper surface 110a of the first light source 110. In the first light source 110, the front light La1 and the side light La2 have different chromaticities, so that the chromaticity detected for the emitted light La of the first light source 110 differs depending on the measurement angle. For example, the front light La1 and the side light La2 are white lights having different correlated color temperatures.

[0031] The front light La1 is a mixed light of a first light L1 that is transmitted through the first wavelength converting member 112 and the light-transmitting member 115 and emitted from the upper surface 110a without being wavelength-converted, and a second light L2 that is wavelength-converted by the first wavelength converting member 112, transmitted through the light-transmitting member 115, and emitted from the upper surface 110a. The color of the front light La1 is, for example, daylight white light with a correlated color temperature of 5700 K or more and 7100 K or less. The chromaticity of the front light La1 is, for example, within the range expressed by 0.29≦x≦0.34 and 0.29≦y≦0.40 in the chromaticity coordinate system.

[0032] The longer the distance the first light L1 passes through the first wavelength conversion member 112, the more likely it is to be wavelength-converted. For example, the side light La2 that passes through the first wavelength conversion member 112 in an oblique direction and is emitted from the vicinity of the periphery of the first wavelength conversion member 112 has a lower ratio of the amount of the first light L1 to the amount of the second light L2 than the front light La1. Therefore, the chromaticity of the side light La2 is closer to the second light L2 than the front light La1. The color of the side light La2 is, for example, white light with a correlated color temperature of 3800K or more and 4500K or less. The chromaticity of the side light La2 is, for example, within a range expressed by 0.335≦x≦0.41 and 0.32≦y≦0.44 in a chromaticity coordinate system.

[0033] The configuration of the first light source 110 is not limited to the above, and the first light source 110 is composed of a mixed light of a first light L1 emitted from the light-emitting element 111 and a second light L2 obtained by wavelength-converting the first light by the first wavelength conversion member 112, and it is sufficient that the first light source 110 is capable of emitting light having different chromaticities as a front light La1 and a side light La2.

[0034] <Second light source> 2B, the second light source 130 has a second light emitting element 131, a second wavelength conversion member 132, a light reflecting member 133, a light guiding member 134, and a light transmissive member 135. The second light source 130 mainly emits fourth light L4 obtained by converting the wavelength of the third light L3 emitted from the second light emitting element 131 by the second wavelength conversion member 132.

[0035] The second light emitting element 131 is, for example, a light emitting diode, and has a semiconductor laminate 131a including a light emitting layer, and positive and negative electrodes 131b and 131c, similar to the first light emitting element 111. The second light emitting element 131 emits a third light L3. The third light L3 is, for example, blue light. The chromaticity of the third light L3 may be in the same range as that of the first light L1 described above, for example, in a chromaticity coordinate system.

[0036] The second wavelength conversion member 132 absorbs the third light L3 emitted from the second light emitting element and emits a fourth light L4 having a wavelength different from that of the third light L3. The second wavelength conversion member 132 adjusts the thickness and density of the second wavelength conversion member 132 so that most of the third light incident on the second wavelength conversion member 132 is wavelength-converted to the fourth light L4. For example, in the emission spectrum of the second light source 130, the emission peak intensity of the third light L3 is 1 / 2 or less of the emission peak intensity of the fourth light. The fourth light L4 is, for example, an amber color ranging from yellowish to reddish. For example, the chromaticity of the fourth light L4 is 0.55≦x≦0.65 and 0.35≦y≦0.45 in the chromaticity coordinate system, and is within a range surrounded by the spectrum locus.

[0037] The second wavelength conversion member 132, like the first wavelength conversion member 112, has a translucent material as a base material and a particulate phosphor as a wavelength conversion substance. The translucent material and phosphor used in the second wavelength conversion member 132 include those exemplified as the materials used in the first wavelength conversion member 112. As the phosphor contained in the second wavelength conversion member 132, for example, a combination of multiple types of phosphors that absorb blue light and emit yellow and / or red light can be used. Specifically, a YAG phosphor can be used as a yellow phosphor, and a nitride phosphor can be used as a red phosphor. The content of the wavelength conversion substance in the second wavelength conversion member 132 is preferably greater than the content of the wavelength conversion substance in the first wavelength conversion member 112, for example.

[0038] The second wavelength conversion member 132 is, for example, plate-shaped, similar to the first wavelength conversion member 112. The surface of the second wavelength conversion member 132 includes, for example, a lower surface 132a, an upper surface 132b, and a side surface 132c.

[0039] The second wavelength conversion member 132 is disposed such that the lower surface 132a faces the main light emitting surface of the second light emitting element 131. The upper surface 132b of the second wavelength conversion member 132 is located on the opposite side of the lower surface 132a in the Z direction. The lower surface 132a and the upper surface 132b are, for example, flat surfaces and are approximately parallel to the upper surface 161 of the substrate 160. The side surface 132c is located between the lower surface 132a and the upper surface 132b. The lower surface 132a of the second wavelength conversion member 132 covers the main light emitting surface of the second light emitting element 131 and extends to an area outside the side surface of the second light emitting element 131 in a top view.

[0040] The second wavelength conversion member 132 preferably has a constant thickness (dimension in the Z direction) like the first wavelength conversion member 112. However, the thickness of the second wavelength conversion member 132 does not necessarily have to be constant, and may have a thickness that varies partially.

[0041] The light reflecting member 133, the light guiding member 134, and the light transmitting member 135 may have the same configuration as the light reflecting member 133, the light guiding member 114, and the light transmitting member 115 in the first light source. In the second light source 130, the thickness of the second wavelength conversion member 132 is preferably made thicker than, for example, the thickness of the first wavelength conversion member in the first light source 110. This makes it possible to convert the wavelength of more of the light passing through the second wavelength conversion member 132. In addition, by adjusting the thickness of the translucent member 135 in the second light source 130 to be thinner than the thickness of the translucent member 115 in the first light source 110, the heights of the light emitting surfaces of the first light source 110 and the second light source 130 from the upper surface 161 of the substrate 160 in the light emitting module 100 can be made equal.

[0042] The light Lb emitted from the second light source 130 includes, for example, front light Lb1 emitted from near the center of the upper surface 130a and side light Lb2 emitted from near the periphery of the upper surface 130a among the light emitted from the second light source 130. Since the proportion of the fourth light L4 is high in the light emitted from the second light source 130, the difference in chromaticity between the light Lb1 and the light Lb2 is small, and the difference in chromaticity of the emitted light La of the second light source 130 depending on the measurement angle is difficult to visually recognize.

[0043] The light Lb emitted from the second light source 130 is a mixed light of the third light L3 that passes through the second wavelength conversion member 132 and the translucent member 135 and is emitted from the upper surface 130a of the second light source 130, and the fourth light L4 that passes through the translucent member 135 and is emitted from the upper surface 130a. As described above, in the second light source 130, the proportion of the third light that passes through the second wavelength conversion member without being wavelength converted is small among the light Lb emitted from the second light source 130. Therefore, the front light Lb1 and the side light Lb2 are unlikely to have a difference in chromaticity. The front light Lb1 and the side light Lb2 are, for example, white light of an incandescent light obtained by mixing the blue third light L3 and the amber fourth light L4. The chromaticity of the front light Lb1 and the side light Lb2 is within the range expressed by 0.38≦x≦0.55 and 0.35≦y≦0.45 in the chromaticity coordinate system, for example.

[0044] The front light Lb1 and the side light Lb2 of the second light source 130 may be configured to have different correlated color temperatures, similar to the first light source 110. The light Lb emitted from the second light source 130 may be substantially composed of only the fourth light L4, and may not include the third light L3. In this way, the configuration of the second light source 130 is not limited to the above, and it is sufficient if the second light source 130 can emit light Lb whose chromaticity is different from the chromaticity of the light La emitted from the first light source 110.

[0045] The form of the first light source and the second light source is not limited to the above form. For example, the first light source and the second light source may not be provided with at least one of the light guide member, the light reflecting member, and the light transmitting member. When the first light source and the second light source are not provided with a light guide member covering the side surface of the light emitting element, the wavelength conversion member may cover not only the upper surface of the light emitting element but also the side surface. Also, when the first light source and the second light source are not provided with a light guide member covering the side surface of the light emitting element, the light reflecting member may cover the side surface of the light emitting element.

[0046] <First lens and second lens> As shown in FIG. 3, the surface of the first lens 120 includes a first surface 121, a second surface 122, and a third surface 123. The first surface 121 is an incident surface on which the light La emitted from the first light source 110 is incident. The first surface 121 includes, for example, a first region 121a facing the upper surface 110a of the first light source 110, and a second region 121b provided around the first region 121a and surrounding the first region 121a. Specifically, the first lens 120 includes an annular convex portion 120a surrounding the first region 121a, and the second region 121b is provided on the convex portion 120a. The first region 121a is, for example, a curved surface convex downward. The second region 121b is, for example, inclined so as to move away from the axis C1 as it moves downward (i.e., toward the first light source).

[0047] The second surface 122 is a reflective surface that reflects at least a part of the light La incident on the first surface 121. The second surface 122 is provided around the periphery of the first surface 121. The second surface 122 is inclined so as to approach the axis C1, for example, in the downward direction.

[0048] The third surface 123 is an emission surface that emits at least a portion of the light La that is incident on the first surface 121. The third surface 123 is located on the opposite side to the first surface 121. The third surface 123 is, for example, a flat surface and is approximately parallel to the upper surface 161 of the substrate 160.

[0049] Second lens 140 is formed integrally with first lens 120. The surfaces of second lens 140 include, for example, first surface 141, second surface 142, and third surface 143. The first surface 141, second surface 142, and third surface 143 of second lens 140 can have the same configuration as the first surface 121, second surface 122, and third surface 123 of first lens 120. The third surface 123 of first lens 120 and the third surface 143 of second lens 140 are continuous and located on the same plane.

[0050] FIG. 4A is a top view showing an example of a light-transmissive member T including a first lens and a second lens. FIG. 4B is a top view showing another example of the light-transmissive member T including the first lens and the second lens. As shown in Figures 4A and 4B, the shape of the outer circumferential edges 122a, 142a of the second surfaces 122, 142 is a substantially rectangular shape with rounded corners in top view. The axis C1 is located at the intersection of the diagonals of the outer circumferential edge 122a. Similarly, the axis C2 is located at the intersection of the diagonals of the outer circumferential edge 142a. In top view, the shape of the light-transmitting member T may be a circle as shown in Figure 4A, or a substantially ellipse as shown in Figure 4B.

[0051] <Drive unit> 1, the driving unit 150 can move, for example, the first lens 120 and the second lens 140 in the up-down direction. The driving unit 150 has, for example, a holding unit 151 that holds the first lens 120 and the second lens 140, and a guide unit 152 that guides the up-down movement of the holding unit 151. The guide unit 152 extends in the up-down direction, and a lower end of the guide unit 152 is attached to, for example, a substrate 160. The holding unit 151 moves in the up-down direction along the guide unit 152 by a motor (not shown).

[0052] The configuration of the drive unit 150 may be, for example, such that the drive unit 150 moves the holder 151 by magnetic force rather than by the power of a motor. Furthermore, the drive unit 150 may change the distance between the first lens 120 and the first light source 110 by moving the first light source 110 rather than by moving the first lens 120. In this case, the holder may hold the substrate 160 on which the first light source 110 is placed.

[0053] FIG. 5 is a schematic diagram showing a trajectory of light when the first lens and the second lens are disposed at a first position. FIG. 6 is a schematic diagram showing a trajectory of light when the first lens and the second lens are disposed at the second position. In order to make the explanation easier to understand, in FIGS. 5 and 6, the front lights La1 and Lb1 are represented by solid lines, and the side lights La2 and Lb2 are represented by dashed lines.

[0054] The driving unit 150 can move the first lens 120 between a first position P1 (see FIG. 5) and a second position P2 (see FIG. 6) where the distance between the first lens 120 and the first light source 110 is greater than that at the first position P1.

[0055] 5, at the first position P1, a part of the first surface 121, which is the incident surface of the first lens 120, is located to the side of the first wavelength conversion member 112 and surrounds the first wavelength conversion member 112. Also, a part of the first surface 141, which is the incident surface of the second lens 140, is located to the side of the second wavelength conversion member 132 and surrounds the second wavelength conversion member 132. In this case, the position of the lower end 121c of the first surface 121 may be located, for example, below the position of the lower surface 112a of the first wavelength conversion member 112. Also, in this case, the position of the lower end 141c of the first surface 141 in the Z direction may be located, for example, below the position of the lower surface 132a of the second wavelength conversion member 132.

[0056] When the first light source 110 is turned on at the first position P1, both the front light La1 and the side light La2 are incident on the first surface 121 of the first lens. Therefore, the light Lc emitted from the first lens 120 is a mixture of the front light La1, which is a daylight white light, and the side light La2, which is a white light that is more yellowish than the front light La1, and is, for example, a daylight white light with a correlated color temperature of 5500K. Also, when the second light source 130 is turned on, both the front light Lb1 and the side light Lb2 are incident on the first surface 141 of the second lens. Therefore, the light Ld emitted from the second lens 140 is a mixture of the front light Lb1 and the side light Lb2, and is, for example, a white light with a bulb color.

[0057] 6, at the second position P2, the position of the lower end 121c of the first surface 121 of the first lens 120 is located, for example, above the position of the upper surface 112b of the first wavelength conversion member 112. Also, the position of the lower end 141c of the first surface 141 of the second lens 140 is located above the position of the upper surface 132b of the second wavelength conversion member 132.

[0058] When the first light source 110 is turned on at the second position P2, the amount of side light La2 incident on the first surface 121 of the first lens 120 is reduced compared to the first position P1, or the side light La2 is not incident on the first surface 121 of the first lens 120. Therefore, the color of the light Lc emitted from the first lens 120 is generally the same as the color of the front light La1, and becomes, for example, daylight white light with a correlated color temperature of 6500K.

[0059] In this way, the driving unit 150 moves the first lens 120 and the second lens 140 to change the distance between the first lens 120 and the first light source 110 and the distance between the second lens 140 and the second light source 130. This makes it possible to change the chromaticity of the light Lc emitted from the first lens 120.

[0060] <Diffusion plate> The diffusion plate 170 covers the third surface 123 of the first lens 120 and the third surface 143 of the second lens 140. The diffusion plate 170 diffuses and transmits incident light. The diffusion plate 170 diffuses light by providing fine irregularities on the surface or dispersing materials with different refractive indices in the diffusion plate 170. The diffusion plate 170 can reduce color unevenness in the light Le emitted from the light-emitting module 100. The diffusion plate 170 is attached to the upper end of the guide portion 152 of the drive portion 150, for example.

[0061] <Control Unit> The control unit 180 controls the operations of the first light source 110, the second light source 130, and the driving unit 150. The control unit 180 includes, for example, a CPU (Central Processing Unit) and a memory.

[0062] The control unit 180 can independently control the output of the first light-emitting element 111 in the first light source 110 and the output of the second light-emitting element 131 in the second light source 130. "Controlling the output" includes turning on and off each of the light-emitting elements 111, 131, and adjusting the output of each of the light-emitting elements 111, 131 when turned on. In addition, the control unit 180 controls the drive unit 150 to move the first lens 120 and the second lens 140 in the vertical direction.

[0063] Next, the operation of the light emitting module 100 according to this embodiment will be described. FIG. 7 is a CIE 1931 chromaticity diagram plotting the color gamut of light emitted from the light emitting module according to this embodiment. Hereinafter, a state in which the first light source 110 is turned on and the second light source 130 is turned off at the first position P1 will be referred to as a "first state." Moreover, a state in which the first light source 110 is turned on and the second light source 130 is turned off at the second position P2 will be referred to as a "second state." Moreover, a state in which the first light source 110 is turned off and the second light source 130 is turned on at the first position P1 will be referred to as a "third state."

[0064] The first state is a state in which the first light source 110 is turned on and the second light source 130 is turned off in FIG. 5. In this state, the color of the light Lc emitted from the third surface 123 of the first lens 120 is a mixture of the front light La1 and the side light La2 of the first light source 110, and is, for example, a neutral white color close to sunlight in the daytime. Since the second light source 130 is turned off, the light Le emitted from the light emitting module 100 is composed only of the light Lc. Therefore, the light Le is, for example, a neutral white color. As shown in FIG. 7, the chromaticity S1 of the light Le is, for example, within a range surrounded by a rectangle connecting four points, namely, point p1 (x=0.335, y=0.32), point p2 (x=0.34, y=0.4), point p3 (x=0.41, y=0.44), and point p4 (x=0.38, y=0.35) in the chromaticity coordinate system. The correlated color temperature of the light Le is, for example, 4500K.

[0065] The second state is a state in which the first light source 110 is turned on and the second light source 130 is turned off in FIG. 6. In this state, the color of the light Lc emitted from the third surface 123 of the first lens 120 is approximately the same as the color of the front light La1 of the first light source 110, and is, for example, a bluish daylight white light. Since the second light source 130 is turned off, the light Le emitted from the light emitting module 100 is composed only of the light Lc. Therefore, the light Le is a daylight white light. As shown in FIG. 7, the chromaticity S2 of the light Le is within a range surrounded by a rectangle connecting four points, namely, point p5 (x=0.31, y=0.29), point p6 (x=0.29, y=0.36), point p2 (x=0.34, y=0.4), and point p1 (x=0.335, y=0.32) in the chromaticity coordinate system. The correlated color temperature of the light Le emitted from the light emitting module 100 is, for example, 6500K.

[0066] Therefore, when the first lens 120 is moved from the first position P1 to the second position P2, or from the second position P2 to the first position P1, with the first light source 110 turned on and the second light source 130 turned off, the chromaticity of the light Le changes on the straight line f1 connecting the chromaticity S1 and chromaticity S2 in the chromaticity coordinate system.

[0067] The third state is a state in which the first light source 110 is turned off in FIG. 5. In this state, the color of the light Ld emitted from the third surface 143 of the second lens 140 is, for example, an incandescent color. Since the first light source 110 is turned off, the light Le emitted from the light emitting module 100 is composed only of the light Ld. Therefore, the light Le is, for example, an incandescent white light. As shown in FIG. 7, the chromaticity S3 of the light Le is, for example, within a range surrounded by a rectangle connecting four points p4 (x=0.38, y=0.35), p3 (x=0.41, y=0.44), p7 (x=0.55, y=0.45), and p8 (x=0.53, y=0.38) in the chromaticity coordinate system. The correlated color temperature of the light Le is, for example, 2300K.

[0068] Furthermore, both the first light source 110 and the second light source 130 may be turned on to mix the light Lc emitted from the first lens 120 and the light Ld emitted from the second lens 140. For example, when the ratio between the output of the first light source 110 and the output of the second light source 130 is changed at the first position P1, the chromaticity of the light Le changes on a straight line f3 connecting the chromaticity S1 and the chromaticity S3 of the chromaticity coordinate system. Specifically, the larger the ratio of the output of the first light source 110 to the output of the second light source 130 is, the closer the chromaticity is to the chromaticity S1 on the straight line f3, and the larger the ratio of the output of the second light source 130 to the output of the first light source 110 is, the closer the chromaticity is to the chromaticity S3 on the straight line f3. Also, for example, when the ratio between the output of the first light source 110 and the output of the second light source 130 is changed at the second position P2, the chromaticity of the light Le changes on a straight line f2 connecting the chromaticity S2 and the chromaticity S3 of the chromaticity coordinate system. Specifically, the larger the ratio of the output of the first light source 110 to the output of the second light source 130, the closer to chromaticity S2 on the line f2, and the larger the ratio of the output of the second light source 130 to the output of the first light source 110, the closer to chromaticity S3 on the line f2.

[0069] In this way, by adjusting the distance between the first light source 110 and the first lens 120, the distance between the second light source 130 and the second lens 140, and the ratio between the output of the first light source 110 and the output of the second light source 130, the chromaticity of the light Le can be changed within the range surrounded by the straight lines f1 to f3.

[0070] FIG. 8 is a CIE 1931 chromaticity diagram plotting the color gamut of light emitted from the light emitting module according to the reference example. The light emitting module according to the reference example does not include the driving unit 150, and the positions of the first lens 120 and the second lens 140 are fixed at the second position P2. When the second light source 130 is turned on in a state in which the second lens 140 is located at the second position P2, the color of the light Ld emitted from the third surface 143 of the second lens 140 is approximately the same as the color of the light Ld in the third state, and is, for example, white light with an incandescent color. Therefore, in the light emitting module according to the reference example, the chromaticity of the light emitted from the light emitting module can be changed only on the straight line f2 connecting the chromaticity S2 and the chromaticity S3 by adjusting the ratio between the output of the first light source 110 and the output of the second light source 130. In contrast, the light emitting module 100 according to the present embodiment can change the color gamut of the light emitted within the range surrounded by the straight lines f1 to f3.

[0071] Furthermore, as shown in FIG. 7, in this embodiment, the emission color of the light-emitting module can be changed at a position close to the blackbody radiation locus, as shown by the line segment connecting chromaticities S1 and S2 and the line segment connecting chromaticity S1 and S3 in the chromaticity coordinate system.

[0072] Next, application examples of the light emitting module 100 will be described. FIG. 9A is an image diagram of a photograph taken without using a flash light source. FIG. 9B is an image diagram of a photograph taken using a flash light source with a color temperature different from that of the ambient light. FIG. 9C is an image diagram of a photograph taken using a flash light source with a color temperature close to that of the ambient light. The light emitting module 100 can be used as a flash light source for a camera mounted on a smartphone, for example.

[0073] As shown in FIG. 9A, when a photograph is taken with a camera in a backlit state without using a flash, a subject a1 in a photograph A1 appears darker than a background a2.

[0074] As shown in Figure 9B, when taking a picture with a camera using a flash light source with a different color temperature from the ambient light, a picture A2 is taken in which the correlated color temperature of the flash irradiating the subject a1 is different from the color temperature of the ambient light. In such a case, a picture A2 in which the subject a1 and the background a2 have different colors can be obtained. Note that Figure 9B shows an example in which the color temperature of the ambient light is 3000K and the correlated color temperature of the flash is 5000K.

[0075] As shown in FIG. 9C, when a camera is used to take a picture using a flash light source with a color temperature close to that of the ambient light, a picture A3 is taken in which the correlated color temperature of the flash irradiated on the subject a1 is approximately the same as the color temperature of the ambient light. This makes it possible to obtain a picture A3 in which the subject a1 and the background a2 have roughly the same color tone. In particular, when the ambient light is natural light such as sunlight, the chromaticity of the ambient light is located on the locus K of blackbody radiation. Therefore, by having the light-emitting module 100 emit light on the locus K of blackbody radiation or light with a chromaticity close to that of the locus K of blackbody radiation, the correlated color temperature of the flash irradiated on the subject a1 can be made roughly the same as the color temperature of the ambient light. This makes it possible to obtain a picture A3 that looks even more natural.

[0076] In this way, by using a flash light source to which the light emitting module 100 according to this embodiment is applied, the color temperature of the flash light source irradiating the subject a1 can be changed to a desired color temperature.

[0077] As shown in FIG. 9A, even if a photo is taken without using a flash light source, the brightness, chromaticity, and color temperature can be adjusted by performing correction such as image processing. However, such correction requires more power and processing time as the image quality becomes higher. In contrast, according to a flash light source to which the light emitting module 100 according to the present embodiment is applied, the light emitted from the flash light source can be changed according to the photo to be taken, so that the power and time spent on image processing can be reduced. Such a light source is particularly suitable for taking high-quality images. The application of the light emitting module 100 is not particularly limited to a flash light source.

[0078] Next, the effects of this embodiment will be described. The light emitting module 100 according to this embodiment includes a first light source 110, a first lens 120, a second light source 130, a second lens 140, and a driving unit 150. The first light source 110 includes a first light emitting element 111 that emits a first light L1, and a first wavelength conversion member 112 that converts the wavelength of a part of the first light L1 and emits a second light L2. The first light source 110 emits light La including the first light L1 and the second light L2. The light La emitted from the first light source 110 is incident on the first lens 120. The second light source 130 emits light Lb whose chromaticity is different from the chromaticity of the light La emitted from the first light source 110. The light Lb emitted from the second light source 130 is incident on the second lens 140. The driving unit 150 changes the distance between the first lens 120 and the first light source 110, thereby changing the amount of second light L2 emitted from the first lens 120.

[0079] In this way, by changing the distance between the first lens 120 and the first light source 110, it is possible to widen the color gamut of the light Lc emitted from the first lens 120. Furthermore, by mixing the light Lc emitted from the first lens 120 and the light Ld emitted from the second lens 140, it is possible to further widen the color gamut of the light Le emitted from the light emitting module 100. From the above, it is possible to realize a light emitting module 100 that can change the chromaticity of the emitted light Le.

[0080] In this embodiment, the driving unit 150 can further change the distance between the second lens 140 and the second light source 130. The first lens 120 and the second lens 140 are integrated together. Therefore, the first lens 120 and the second lens 140 can be moved with a simple structure.

[0081] Moreover, the driving unit 150 can move the first lens 120 between a first position P1 and a second position P2 where the distance between the first lens 120 and the first light source 110 is greater than that at the first position P1. At the first position P1, a part of the first surface 121, which is an incident surface of the first lens 120 on which the light La emitted from the first light source 110 is incident, is located to the side of the first wavelength conversion member 112. Therefore, at the first position P1, the side light La2 can be sufficiently incident on the first surface 121 of the first lens 120. At the second position P2, the amount of the side light La2 incident on the first surface 121 can be reduced more than at the first position P1.

[0082] Moreover, the first lens 120 and the second lens 140 are total reflection lenses. The lenses 120 and 140, which are total reflection lenses, are provided with convex portions 120a and 140b. Therefore, the lenses 120 and 140 can easily capture both the front light La1 and Lb1 and the side light La2 and Lb2 at the first position P1.

[0083] Moreover, in top view, the first wavelength conversion member 112 covers the first light emitting element 111 and extends to an area outside the side surface of the first light emitting element 111. For this reason, the light La emitted from the first light source 110 includes front light La1 and side light La2, and the difference in chromaticity between the front light La1 and the side light La2 can be increased.

[0084] Moreover, the light emitting module 100 further includes a diffusion plate that diffuses the light La emitted from the first lens 120 and the light Lb emitted from the second lens 140. Therefore, color unevenness in the light Le emitted from the light emitting module 100 can be suppressed.

[0085] In addition, the output of the first light source 110 and the output of the second light source 130 can be controlled independently. Therefore, by independently controlling the output of the first light source 110 and the output of the second light source 130, the color gamut of the light Le emitted from the light emitting module 100 can be further expanded.

[0086] <Second embodiment> Next, a second embodiment will be described. FIG. 10 is an end view showing the light emitting module according to the present embodiment. FIG. 11A is a top view showing an example of the first lens and the second lens. FIG. 11B is a top view showing an example of the first lens and the second lens. The light emitting module 200 according to this embodiment differs from the light emitting module 100 according to the first embodiment in the configurations of the first lens 220 and the second lens 240. In the following description, in principle, only the differences from the first embodiment will be described, and the matters other than those described below are the same as the first embodiment.

[0087] The first lens 220 and the second lens 240 are, for example, Fresnel lenses. The first lens 220 and the second lens 240 are, for example, integral and made of one light-transmitting member T2.

[0088] The surface of the first lens 220 includes a first surface 221 and a second surface 222. The first surface 221 is an incident surface on which the light La emitted from the first light source 110 is incident. The first surface 221 faces the upper surface 110a of the first light source 110. On the first surface 221, for example, a plurality of annular convex portions 221a are provided concentrically around the axis C1. The second surface 222 is located on the opposite side to the first surface 221. The second surface 222 is, for example, a flat surface, and is, for example, approximately parallel to the upper surface 161 of the substrate 160.

[0089] The surface of the second lens 240 includes a first surface 241 and a second surface 242. The first surface 241 is an incident surface on which the light Lb emitted from the second light source 130 is incident. The first surface 241 faces the upper surface 130a of the second light source 130. On the first surface 241, for example, a plurality of annular convex portions 241a are provided concentrically around the axis C2. The second surface 242 is located on the opposite side of the first surface 241. The second surface 242 is, for example, a flat surface, and is, for example, approximately parallel to the upper surface 161 of the substrate 160.

[0090] As shown in FIGS. 11A and 11B, the shape of the light-transmitting member T2 in top view may be circular as shown in FIG. 11A, or may be substantially elliptical as shown in FIG. 11B.

[0091] Next, the effects of this embodiment will be described. In this embodiment, the first lens 220 and the second lens 240 are Fresnel lenses. Therefore, the lenses 220 and 240 are provided with convex portions 221a and 241a. Therefore, the lenses 220 and 240 can sufficiently capture both the front light La1 and Lb1 and the side light La2 and Lb2 at the first position P1.

[0092] In the first and second embodiments, the driver moves both the first lens and the second lens. However, the driver may move only the first lens. The first lens and the second lens may be replaced with reflectors. [Industrial Applicability]

[0093] The present invention can be used, for example, in a light source for a flash. [Explanation of symbols]

[0094] 100, 200: Light emitting module 110: 1st light source 110a:Top surface 111: First light-emitting element 111a: Semiconductor laminate 111b, 111c: Electrode 112: First wavelength conversion member 112a: Bottom surface 112b:Top surface 112c: Side 113: Light reflecting member 114: Light guide member 115: Light-transmitting material 120, 220: 1st lens 121, 221: Front page 121a:First area 121b:Second area 121c: Bottom edge 122, 222: 2nd side 122a: Outer rim 123:Side 3 130:Second light source 130a:Top surface 131: second light-emitting element 131a: Semiconductor laminate 131b, 131c: Electrode 132: second wavelength conversion member 132a: Bottom surface 132b:Top surface 132c: Side 133: Light reflecting material 134: Light guide member 135: Translucent material 140, 240: 2nd lens 141, 241: Front page 141a: First area 141b:Second area 141c: Bottom end 142, 242: 2nd side 142a: Outer edge 143:Side 3 150: Drive unit 151: Holding part 152: Guide section 160: Circuit board 161:Top surface 162: Bottom surface 170: Diffuser 180: Control unit 221a, 241a: convex part A1~A3: Photos a1: Subject a2:Background C1: Axis C2: Axis K: Blackbody radiation locus L1: 1st light L2: Second light L3: Third Light L4: 4th light La: Light emitted from the first light source La1: Front light La2: Side light Lb: Light emitted from the second light source Lb1: Front light Lb2: Side light Lc: Light emitted from the first lens Ld: Light emitted from the second lens Le: Light emitted from the light-emitting module P1: 1st position P2: 2nd position p1~p6: points S1~S4: Chromaticity T, T2: Lens

Claims

1. a first light source including a first light emitting element that emits a first light and a first wavelength conversion member that converts a wavelength of a part of the first light and emits a second light, the first light source emitting light including the first light and the second light; a first lens onto which light emitted from the first light source is incident; A drive unit that changes a distance between the first lens and the first light source; a second light source that emits light having a chromaticity different from the chromaticity of the light emitted from the first light source; a second lens onto which the light emitted from the second light source is incident; Equipped with A light emitting module in which the amount of the second light emitted from the first lens is changed by changing the distance between the first lens and the first light source.

2. The light emitting module according to claim 1 , wherein the driving section is further capable of changing a distance between the second lens and the second light source.

3. The light emitting module according to claim 2 , wherein the first lens and the second lens are integral.

4. The light-emitting module according to any one of claims 1 to 3, wherein the second light source has a second light-emitting element that emits a third light, and a second wavelength conversion member that converts the wavelength of a portion of the third light and emits a fourth light.

5. the light emitted from the second light source includes the third light and the fourth light, The light emitting module according to claim 4 , wherein the drive section is capable of changing the chromaticity of the light emitted from the second lens by changing the distance between the second lens and the second light source.

6. the driving unit is capable of moving the first lens to a first position and a second position where the distance between the first lens and the first wavelength conversion member is greater than the first position, An optical emission module as described in any one of claims 1 to 5, wherein, in the first position, a portion of the incident surface of the first lens onto which light emitted from the first light source is incident is located to the side of the first wavelength conversion member.

7. the chromaticity of the light emitted from the first lens at the first position is within a range surrounded by a rectangle connecting four points, (x=0.335, y=0.32), (x=0.34, y=0.4), (x=0.41, y=0.44), and (x=0.38, y=0.35), in an xy chromaticity coordinate system of a CIE 1931 chromaticity diagram; 7. The light-emitting module according to claim 6, wherein the color temperature of the light emitted from the first lens at the second position is within a range surrounded by a rectangle connecting four points: (x=0.31, y=0.29), (x=0.29, y=0.36), (x=0.34, y=0.4), and (x=0.335, y=0.32) in the xy chromaticity coordinate system of the CIE 1931 chromaticity diagram.

8. 8. The light emitting module according to claim 1, wherein the first lens and the second lens are total reflection lenses.

9. 8. The light emitting module according to claim 1, wherein the first lens and the second lens are Fresnel lenses.

10. The light-emitting module according to any one of claims 1 to 9, wherein the first wavelength conversion member covers the first light-emitting element when viewed from above and extends to an area outside the side surface of the first light-emitting element.

11. 11. The light emitting module according to claim 1, further comprising a diffusion plate that diffuses the light emitted from the first lens and the light emitted from the second lens.

12. 12. The light emitting module according to claim 1, wherein an output of the first light source and an output of the second light source are independently controllable.

Images