Light source modules and lighting fixtures

Abstract

This invention provides a light source module that can reduce color shifts in the composite light. [Solution] The light source module 20 comprises a plurality of light source packages, including a first light source package 21W and a second light source package 21B. The first light source package 21W has a first light-emitting element 211, a first frame 212, and a first encapsulant 213. The first encapsulant 213 is filled inside the first frame 212 so as to cover the first light-emitting element 211. The first encapsulant 213 contains a phosphor 215. The second light source package 21B has a second light-emitting element 221 and a second encapsulant 223. The second encapsulant 223 covers the second light-emitting element 221. The first length W1 is a length greater than or equal to the second length W2. The first length W1 is the length from the first surface 212d to the second surface 212c of the first frame 212. The second length W2 is the length from the third surface 222d to the fourth surface 222c of the second light source package 21B.

Description

Technical Field

[0001] The present disclosure relates to a light source module and a lighting fixture, and more particularly to a light source module including a plurality of types of light source packages including a light source package containing a phosphor, and a lighting fixture including the above light source module.

Background Art

[0002] The lighting device described in Patent Document 1 includes a substrate and a white LED package (first light source package). The white LED package is disposed on the substrate. The white LED package includes a blue light-emitting diode (first light-emitting element) and a yellow fluorescent layer (phosphor). The blue light-emitting diode is disposed on the substrate. The yellow fluorescent layer is provided so as to cover the blue light-emitting diode, and emits yellow light (second light) by being excited by blue light (first light) from the blue light-emitting diode. This lighting device irradiates white light, which is a combined light of the blue light emitted by the blue light-emitting diode and the yellow light emitted by the yellow fluorescent layer, as irradiation light.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Consider a lighting device described in Patent Document 1, further comprising a blue LED package (second light source package), a green LED package, and a red LED package, enabling the emission of colored light in addition to white light. In this case, the blue LED package has a blue light-emitting diode (second light-emitting element). The green LED package has a green light-emitting diode. The red LED package has a red light-emitting diode. The blue LED package, green LED package, and red LED package are arranged around the white LED package. In such a lighting device, when emitting white light, the light emitted from each of the white LED package, blue LED package, green LED package, and red LED package (i.e., LED packages of all light colors) is combined to form white light.

[0005] However, in this case, of the blue light (first light with first color) emitted by the blue LED package (second light source package), most of the blue light is emitted forward, but some of the blue light is emitted laterally, and this laterally emitted blue light is absorbed by the yellow fluorescent layer (phosphor) on the surface of the adjacent white LED package and converted into yellow light (converted light with second color). Consequently, the blue light component (first color) of the illumination light is reduced and the yellow light component (second color) is increased. As a result, the color of the illumination light (i.e., the combined light) is shifted towards the yellow side overall, resulting in a problem where the light color does not match the design (i.e., the color of the combined light is color-shifted).

[0006] This disclosure aims to provide a light source module and lighting fixture that can reduce color shift in the light color of the synthesized light. [Means for solving the problem]

[0007] A light source module according to one aspect of the present disclosure comprises a substrate and a plurality of types of light source packages. The substrate has a main surface. The plurality of types of light source packages are arranged on the main surface of the substrate. The plurality of types of light source packages include a first light source package and a second light source package. The first light source package comprises a first light-emitting element, a first frame, and a first encapsulant. The first light-emitting element emits first light having a first light color. The first frame surrounds the first light-emitting element and is light-shielding. The first encapsulant is filled inside the first frame so as to cover the first light-emitting element. The first encapsulant includes a phosphor. The phosphor converts a portion of the first light emitted from the first light-emitting element into converted light having a second light color different from the first light color, and emits the converted light. The second light source package comprises a second light-emitting element and a second encapsulant. The second light-emitting element emits second light having the first light color. The second encapsulant covers the second light-emitting element. The first frame has a first surface and a second surface. The first surface faces the substrate. The second surface is the surface opposite to the substrate. The second light source package has a third surface and a fourth surface. The third surface faces the substrate. The fourth surface is the surface opposite to the substrate. The first length is greater than or equal to the second length. The first length is the length from the first surface to the second surface in the first frame. The second length is the length from the third surface to the fourth surface in the second light source package.

[0008] A lighting fixture according to one aspect of the present disclosure comprises a light source module, a fixture body, and a light distribution control member. The fixture body has an opening. The fixture body houses the light source module. The light distribution control member is housed in the fixture body and is positioned between the light source module and the opening and is positioned to close the opening. [Effects of the Invention]

[0009] The light source module and lighting fixture related to this disclosure have the effect of reducing color shift in the composite light. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view of a lighting fixture according to an embodiment of this disclosure. [Figure 2] Figure 2 is an exploded perspective view of the same lighting fixture. [Figure 3] Figure 3 is a cross-sectional view of the same lighting fixture. [Figure 4] Figure 4 is a longitudinal cross-sectional view of the same lighting fixture. [Figure 5] Figure 5 is a plan view of the light source module of the same lighting fixture. [Figure 6] Figure 6 is a partial cross-sectional view showing a portion of the X1-X1 section in Figure 5. [Figure 7] Figure 7 is a partial cross-sectional view of the light source module of Modified Example 1. [Figure 8] Figure 8 is a partial cross-sectional view of the light source module of Modified Example 2. [Figure 9] Figure 9 is a partial cross-sectional view of the light source module of the modified example 3. [Figure 10] Figure 10 is a partial cross-sectional view of the light source module of Modification 4. [Modes for carrying out the invention]

[0011] (Embodiment) Hereinafter, the light source module and lighting fixture according to the embodiments of this disclosure will be described in detail with reference to the drawings. However, the figures described in the following embodiments are schematic diagrams, and the ratios of the size and thickness of each component do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of this disclosure. This disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of this disclosure can be achieved.

[0012] (1) Overview As shown in Figure 6, the light source module 20 according to the embodiment comprises a substrate 22 and a plurality of types of light source packages 21. The substrate 22 has a first main surface 22a. The plurality of types of light source packages 21 are arranged on the first main surface 22a of the substrate 22. The plurality of types of light source packages 21 include a first light source package 21W and a second light source package 21B. The first light source package 21W includes a first light-emitting element 211, a first frame 212, and a first encapsulant 213. The first light-emitting element 211 emits first light having a first light color. The first frame 212 surrounds the first light-emitting element 211 and has light-shielding properties. The first encapsulant 213 is filled inside the first frame 212 so as to cover the first light-emitting element 211. The first encapsulant 213 includes a phosphor 215. The phosphor 215 converts a portion of the first light emitted from the first light-emitting element 211 into converted light having a second light color different from the first light color, and emits the converted light. The second light source package 21B includes a second light-emitting element 221 and a second encapsulant 223. The second light-emitting element 221 emits second light C2 having a first light color. The second encapsulant 223 covers the second light-emitting element 221. The first frame 212 has a rear surface 212d (first surface) and a front surface 212c (second surface). The rear surface 212d faces the substrate 22. The front surface 212c is the surface opposite to the substrate 22. The second light source package 21B has a rear surface 222d (third surface) and a front surface 222c (fourth surface). The rear surface 222d faces the substrate 22. The front surface 222c is the surface opposite to the substrate 22. The first length W1 from the rear surface 212d to the front surface 212c in the first frame 212 is greater than or equal to the second length W2 from the rear surface 222d to the front surface 222c in the second light source package 21B.

[0013] According to this configuration, the first length W1 is equal to or greater than the second length W2. Therefore, the first frame body 212 can reduce the incidence of the second light C2 emitted from the second light source package 21B onto the phosphor 215 of the first light source package 21W. As a result, it is possible to reduce the deviation of the light color of the combined light of the light emitted from the first light source package 21W (the combined light of the first light and the converted light) and the second light emitted from the second light source package 21B from the designed light color. That is, it is possible to reduce the color shift of the combined light emitted from the light source module 20.

[0014] (2) Details Hereinafter, the light source module 20 and the lighting fixture 5 according to the embodiment will be described with reference to the drawings.

[0015] (2-1) Configuration of the lighting fixture 5 As shown in FIGS. 1 to 4, the lighting fixture 5 according to the embodiment includes a light emitting device 1 and a fixture body 50. In the following description, unless otherwise specified, the directions indicated by the arrows in the front-rear, up-down, and left-right directions in FIG. 1 are defined as the front-rear, up-down, and left-right directions of the light emitting device 1 and the lighting fixture 5, respectively.

[0016] The fixture body 50 is formed in a long rectangular parallelepiped shape with the left-right direction as the longitudinal direction (see FIGS. 1 and 2). The fixture body 50 includes a rectangular rear wall 51 and a front wall 52, an upper side wall 53 that is, for example, rectangular and connects the upper ends of the rear wall 51 and the front wall 52, and a lower side wall 54 that is, for example, rectangular and connects the lower ends of the rear wall 51 and the front wall 52. The fixture body 50 further includes a left side wall 55 that is, for example, square and is connected to the left ends of each of the rear wall 51, the front wall 52, the upper side wall 53, and the lower side wall 54, and a right side wall 56 that is, for example, square and is connected to the right ends of each of the rear wall 51, the front wall 52, the upper side wall 53, and the lower side wall 54. However, a rectangular opening 520 is provided in the front wall 52. The fixture body 50 is preferably composed of a metal plate.

[0017] The light-emitting device 1 is, for example, a light-emitting device capable of irradiating illumination light of a full-color light color. The light-emitting device 1 includes a light source module 20 and a light distribution control member 3 (see FIGS. 3-4). The light-emitting device 1 further includes a power supply unit 4 for lighting the light source module 20, a housing 23 that houses the light source module 20 and the power supply unit 4 inside, and a cover 24 that closes a window 2330 provided in the housing 23. However, in the following description, the unit composed of the light source module 20, the power supply unit 4, the housing 23, and the cover 24 is described as the light source unit 2. That is, the light-emitting device 1 includes the light source unit 2 and the light distribution control member 3 (see FIG. 2).

[0018] The light source module 20 has a plurality of types (four types in the example of FIG. 5) of light source packages 21 with different light colors from each other, and a substrate 22 on which the plurality of types of light source packages are mounted (arranged) on the main surface (front surface) 22a (see FIG. 5). The plurality of types of light source packages 21 include, for example, a first light source package 21W, a second light source package 21B, a third light source package 21R, and a fourth light source package 21G.

[0019] The first light source package 21W is a white light source package that emits white light having a white color. The second light source package 21B is a blue light source package that emits blue light (second light) having a blue color (first light color). The third light source package 21R is a red light source package that emits red light (third light) having a red color (third light color). The fourth light source package 21G is a green light source package that emits green light (fourth light) having a green color (fourth light color). The light source module 20 has multiple sets (four sets in the example in Figure 5) of the above multiple types of light source packages 21 as one set. In other words, the light source module 20 has the same number of first light source packages (4) as the number of sets (4) mentioned above, the same number of second light source packages (4) as the number of sets (4) mentioned above, the same number of third light source packages (4) as the number of sets (4) mentioned above, and the same number of fourth light source packages (4) as the number of sets (4) mentioned above. The light emitted from the light source module 20 (composite light) is the composite light of the light emitted from each of the sets of light source packages 21. In this embodiment, the combination of the first light color, third light color, and fourth light color is red, blue, and green.

[0020] The substrate 22 is formed, for example, in the shape of a long rectangle (see Figures 3-4). The substrate 22 has a first main surface 22a (main surface) and a second main surface 22b that face each other in the thickness direction of the substrate 22. The first main surface 22a is the front surface, and the second main surface 22b is the rear surface. The first main surface 22a and the second main surface 22b are, for example, rectangular in shape.

[0021] Multiple sets of light source packages 21 (i.e., multiple sets (5 sets x 4 types) of light source packages 21 included in the multiple sets) are mounted (arranged) in a line in the longitudinal direction (left-right direction) of the first main surface 22a of the substrate 22, for example, in the center in the width direction (vertical direction) of the first main surface 22a.

[0022] The power supply unit 4 has a printed circuit board 40 on which multiple electronic components 41 are mounted (see Figure 3). The printed circuit board has multiple lighting circuits that correspond one-to-one with multiple types of light source packages 21, and a control circuit that controls the multiple lighting circuits.

[0023] The multiple lighting circuits include first to fourth lighting circuits. The first lighting circuit supplies DC current to multiple first light source packages 21W to light them up. The second lighting circuit supplies DC current to multiple second light source packages 21B to light them up. The third lighting circuit supplies DC current to multiple third light source packages 21R to light them up. The fourth lighting circuit supplies DC current to multiple fourth light source packages 21G to light them up. The control circuit is configured to dim and color-tune the light emitted from the light source module 20 by individually adjusting the output current (DC current) of each of the first to fourth lighting circuits in response to a control signal given from outside the lighting fixture 5. In this embodiment, the light emitted from the light source module 20 can be adjusted by the control circuit to dim and color-tune it to, for example, light having any color of light within the full color range.

[0024] The housing 23 has, for example, a cylindrical main body 230 and side parts (first side part 2310 and second side part 2320) attached to both ends of the main body 230 in the longitudinal direction (left-right direction, axial direction).

[0025] The main body 230 is formed in a hollow cylindrical shape from, for example, an extruded aluminum or aluminum alloy (see Figure 3). A rectangular window 2330 is opened on the front of the main body 230. In addition, a groove 234 is provided on each front end of the inner surface of the main body 230 (see Figure 3). The light source module 20 is supported by the main body 230 by fitting both ends (upper and lower ends) of the substrate 22 along the longitudinal direction into these pair of grooves 234. The light source module 20 is supported by the main body 230 so that the front of the substrate 22 faces the window 2330 of the main body 230. The power supply unit 4 is housed at the rear end inside the main body 230.

[0026] The first side portion 2310 and the second side portion 2320 are each formed in a flat plate shape from aluminum or an aluminum alloy (see Figure 2). The first side portion 2310 is screwed to one end (left end) in the longitudinal direction of the main body portion 230. The second side portion 2320 is screwed to the other end (right end) in the longitudinal direction of the main body portion 230. In other words, both ends in the longitudinal direction of the main body portion 230 are closed by the first side portion 2310 and the second side portion 2320.

[0027] The cover 24 is made of a material that is transparent to visible light (for example, inorganic glass such as quartz glass, organic glass such as acrylic resin, or polycarbonate resin), and is formed in a shape in which a part of the cylinder is cut along the axial direction of the cylinder (see Figures 2-3). The cover 24 is attached to the housing 23 so as to block the window 2330. The light emitted from the light source module 20 passes through the cover 24 and is emitted out of the housing 23.

[0028] The light source unit 2 is housed inside the fixture body 50 with its cover 24 facing the opening 520 in the front wall 52 (see Figure 3). Here, recesses 235 are provided on the front and rear surfaces of the housing 23 of the light source unit 2. On the other hand, a pair of protrusions 57 are provided on the right side of the left wall 55 and the left side of the right wall 56 of the fixture body 50. The pair of protrusions 57 provided on the left wall 55 and the right wall 56 fit into the recesses 235 on the front and rear surfaces of the housing 23, thereby positioning the housing 23 relative to the fixture body 50 (see Figures 2-3).

[0029] The light distribution control member 3 includes a base plate 30 and a diffuser 32 (see Figure 3). The base plate 30 is formed in the shape of a rectangular flat plate and is transparent to light emitted from the light source module 20. The base plate 30 is made of a transparent material, for example (for example, inorganic glass such as quartz glass, or organic glass such as acrylic resin, or polycarbonate resin).

[0030] The diffusion portion 32 is formed on the second surface (front surface) 302 of the base plate 30. The diffusion portion 32 is composed of, for example, fine irregularities (texture) formed on the second surface 302 of the base plate 30. However, the diffusion portion 32 is formed only on a part of the second surface 302. For example, as shown in Figure 2, the diffusion portion 32 is formed in the central band-shaped portion of the second surface 302, excluding both ends in the short direction (up and down direction) (hereinafter referred to as the first region S1). On the other hand, the diffusion portion 32 is not formed in the part of the second surface 302 other than the first region S1 (hereinafter referred to as the second region S2).

[0031] The light distribution control member 3 is housed inside the fixture body 50. The light distribution control member 3 is positioned between the opening 520 of the fixture body 50 and the light source unit 2 (and therefore between the opening 520 and the light source module 20). The light distribution control member 3 is attached to the rear surface of the front wall 52 with its first surface 301 facing the light source unit 2 and the opening 520 closed by the base plate 30 (see Figure 3).

[0032] A lens may be provided on the first surface (rear surface) 301 of the base plate 30. The lens is, for example, a condensing lens, specifically a linear Fresnel lens. However, the lens may include lenses other than a condensing lens (linear Fresnel lens). The optical axis of the lens passes through the center of the base plate 30 in the short direction (vertical direction) and is perpendicular to the first surface 301 of the base plate 30.

[0033] In the light-emitting device 1, the first region S1 of the second surface 302 on which the diffusion portion 32 is formed overlaps with the projection region S3 on which multiple sets of light source packages 21 are projected onto the second surface 302 along the front-to-back direction (see Figure 3).

[0034] In this case, the light-emitting device 1 has a region (second region S2) on the second surface 302 of the base plate 30 of the light distribution control member 3 where the diffusion portion 32 is not formed. Therefore, the spread of the light distribution angle can be suppressed compared to the case where the diffusion portion 32 is formed over the entire second surface 302.

[0035] (2-2) Array of light source packages Refer to Figure 4 to illustrate the arrangement of multiple sets of light source packages 21.

[0036] As described above, the multiple sets of light source packages 21 (i.e., multiple sets (5 sets x 4 types) of light source packages 21 included in the multiple sets) are mounted (arranged) in a line along the longitudinal direction of the first main surface (front) 22a of the substrate 22, for example, in the center in the width direction of the first main surface 22a.

[0037] More specifically, the multiple types (four types) of light source packages 21 (i.e., the first light source package 21W, the second light source package 21B, the third light source package 21R, and the fourth light source package 21G) are arranged in a predetermined sequence (in the example in Figure 5, the sequence is third light source package 21R, second light source package 21B, first light source package 21W, and fourth light source package 21G) from one end of the row (the left end in Figure 5) to the other end (the right end in Figure 5). In other words, the multiple sets of light source packages 21 are arranged in a sequence that repeats the above sequence as an example. Note that the above sequence is just an example and is not limited to this sequence. Note that the first light source package 21W and the second light source package 21B may or may not be adjacent. In the example in Figure 5, the case where the first light source package 21W and the second light source package 21B are adjacent is illustrated. Furthermore, in multiple sets of light source packages 21, the first light source package 21W and the second light source package 21B do not need to be adjacent in all sets; it is sufficient if the first light source package 21W and the second light source package 21B are adjacent in at least some sets. Note that two light source packages 21 are considered adjacent if there are no other light source packages 21 between them. Therefore, there are no other light source packages (i.e., the third light source package 21R and the fourth light source package 21G) between adjacent first light source packages 21W and second light source packages 21B.

[0038] (2-3) Configuration of the light source package The configuration of each light source package 21 will be explained with reference to Figure 6.

[0039] The first light source package 21W includes a first light-emitting element 211, a first frame 212, and a first encapsulating material 213.

[0040] The first light-emitting element 211 emits first light (blue light) having a first light color (e.g., blue). The first light-emitting element 211 is, for example, an LED (Light Emitting Diode), an organic electroluminescent element, or a semiconductor laser diode.

[0041] The first frame 212 is a frame-shaped member that surrounds the first light-emitting element 211. The first frame 212 surrounds the first light-emitting element 211 in a plan view from the normal direction (front-to-back direction) of the first main surface 22a of the substrate 22. The first frame 212 is frame-shaped (for example, rectangular frame-shaped) in a plan view from the normal direction (front-to-back direction) of the first main surface 22a of the substrate 22. The first frame 212 is formed of a light-shielding material (for example, resin). The first frame 212 has an outer circumferential surface 212a, an inner circumferential surface 212b, a front surface 212c (second surface), and a rear surface 212d (first surface). The outer circumferential surface 212a is cylindrical (for example, square cylindrical). The inner circumferential surface 212b is conical cylindrical (for example, square pyramidal cylindrical). The inner circumferential surface 212b is inclined outward from the rear surface 212d towards the front surface 212c. The rear surface 212d faces the substrate 22. The front surface 212c is the surface opposite to the substrate 22. The front surface 212c and the rear surface 212d are both planar. The front surface 212c and the rear surface 212d of the first frame 212 constitute the front and rear surfaces of the first light source package 21W, respectively.

[0042] The first encapsulant 213 is filled inside the first frame 212 so as to cover the first light-emitting element 211. The first encapsulant 213 is a translucent (in other words, transparent) resin that allows the first light emitted by the first light-emitting element 211 to pass through. The first encapsulant 213 has a front surface 213a (fifth main surface). The front surface 213a is the surface exposed from the front surface 212c side of the first frame 212. The front surface 213a of the first encapsulant 213 is, for example, a flat surface. The height of the front surface of the first encapsulant 213 (i.e., the height of the front surface 213a from the first main surface 22a of the substrate 22) is less than or equal to the height of the front surface 212c of the first frame 212 (i.e., the height of the front surface 212c from the first main surface 22a of the substrate 22). In other words, the height of the front surface 213a of the first encapsulant 213 is the same as or lower than the height of the front surface 212c of the first frame 212. That is, the front surface 213a of the first encapsulant 213 is formed so as not to exceed the front surface 212c of the first frame 212. In this way, by making the height of the front surface 213a of the first encapsulant 213 less than or equal to the height of the front surface 212c of the first frame 212, the incidence of the second light C2 emitted from the adjacent second light source package 21B into the first encapsulant 213 through the opening in the front surface 212c of the first frame 212 is reduced.

[0043] The "height" mentioned above refers to the height in the direction normal to the main surface 22a of the substrate 22. Furthermore, the front surface 213a may be a curved surface that curves upward or downward in a dome shape. In this case, if the front surface 213a is a curved surface, the height refers to the height at the highest point of the curved surface.

[0044] The first encapsulant 213 includes a phosphor 215. The phosphor 215 absorbs a portion of the first light (i.e., light having a first color (e.g., blue)) emitted from the first light-emitting element 211, and converts the absorbed portion of the light into light having a different color from the first color (e.g., yellow) (converted light) and emits it.

[0045] When the first light (blue light) emitted from the first light-emitting element 211 and the converted light (yellow light) emitted from the phosphor 215 are combined, light having a white color (i.e., white light) is formed. In other words, the first light source package 21W emits combined light (white light) which is the result of combining the first light (blue light) emitted from the first light-emitting element 211 and the converted light (yellow light) emitted from the phosphor 215.

[0046] The second light source package 21B includes a second light-emitting element 221, a second frame 222, and a second sealing material 223.

[0047] The second light-emitting element 221 emits a second light (blue light) having a first light color (e.g., blue). The second light-emitting element 221 is, for example, an LED (Light Emitting Diode), an organic electroluminescent element, or a semiconductor laser diode.

[0048] The second frame 222 is a frame-shaped member that surrounds the second light-emitting element 221. The second frame 222 surrounds the second light-emitting element 221 in a plan view from the normal direction (front-to-back direction) of the first main surface 22a of the substrate 22. The second frame 222 is frame-shaped (e.g., rectangular frame shape) in a plan view from the normal direction of the first main surface 22a of the substrate 22. The second frame 222 is formed of a light-shielding material (e.g., resin). The second frame 222 has an outer circumferential surface 222a, an inner circumferential surface 222b, a front surface 222c, and a rear surface 222d. The rear surface 222d faces the substrate 22. The front surface 222c is the surface opposite to the substrate 22. The outer circumferential surface 222a is cylindrical (e.g., square cylinder shape). The inner circumferential surface 222b is conical cylinder (e.g., square pyramidal cylinder shape). The inner circumferential surface 222b is inclined outward from the rear surface 222d towards the front surface 222c. The front surface 222c and the rear surface 222d are both planar. The front surface 222c and the rear surface 222d of the second frame 222 constitute the front (fourth surface) and rear (third surface) of the second light source package 21B, respectively. Hereafter, these may be referred to as the front surface 222c and the rear surface 222d of the second light source package 21B.

[0049] The second encapsulant 223 is filled inside the second frame 222 so as to cover the second light-emitting element 221. The second encapsulant 223 is a translucent (in other words, transparent) resin that allows the second light emitted by the second light-emitting element 221 to pass through. The front surface 223a of the second encapsulant 223 is, for example, flat. The height of the front surface 213a of the second encapsulant 223 is not particularly limited. Therefore, the height of the second encapsulant 223 is the same height as the front surface 222c of the second frame 222, lower than the front surface 222c, or higher than the front surface 222c. In the example in Figure 6, the height of the second encapsulant 223 is shown to be the same height as the front surface 222c of the second frame 222. The front surface 223a may be a curved surface that curves upward or downward in a dome shape. In this case, the height when the front surface 223a is a curved surface is the height at the highest point of the curved surface.

[0050] The third light source package 21R includes a third light-emitting element 231, a third frame 232, and a third sealing material 233.

[0051] The third light source package 21R is configured similarly to the second light source package 21B, except that the second light-emitting element 221 is replaced with a third light-emitting element 231. The third light-emitting element 231 emits a third light (red light) having a third color (e.g., red). The third light-emitting element 231 is, for example, an LED (Light Emitting Diode), an organic electroluminescent element, or a semiconductor laser diode. The third frame 232 is a frame-shaped member that surrounds the third light-emitting element 231. The third frame 232 is configured similarly to the second frame 222 of the second light source package 21B. Therefore, a detailed description of the third frame 232 is omitted. The third encapsulant 233 is filled inside the third frame 232 to cover the third light-emitting element 231. The third encapsulant 233 is configured similarly to the second encapsulant 223 of the second light source package 21B. Therefore, a detailed description of the third encapsulant 233 is omitted.

[0052] The fourth light source package 21G includes a fourth light-emitting element 241, a fourth frame 242, and a fourth sealing material 243.

[0053] The fourth light source package 21G is configured similarly to the second light source package 21B, except that the second light-emitting element 221 is replaced with a fourth light-emitting element 241. The fourth light-emitting element 241 emits a fourth light (green light) having a fourth color (e.g., green). The fourth light-emitting element 241 is, for example, an LED (Light Emitting Diode), an organic electroluminescent element, or a semiconductor laser diode. The fourth frame 242 is a frame-shaped member that surrounds the fourth light-emitting element 241. The fourth frame 242 is configured similarly to the second frame 222 of the second light source package 21B. Therefore, a detailed description of the fourth frame 242 is omitted. The fourth encapsulant 243 is filled inside the fourth frame 242 to cover the fourth light-emitting element 241. The fourth encapsulant 243 is configured similarly to the second encapsulant 223 of the second light source package 21B. Therefore, a detailed description of the fourth encapsulant 243 is omitted.

[0054] In the light source module 20, the first length W1 of the first frame 212 of the first light source package 21W, from the rear surface 212d to the front surface 212c, is greater than or equal to the second length W2 of the second light source package 21B, from the rear surface 222d to the front surface 222c. That is, the first length W1 is equal to or longer than the second length W2. Note that the first length W1 is the length in the direction of the centerline (front-to-back direction) of the first frame 212. The second length W2 is the length in the direction of the centerline (front-to-back direction) of the second frame 222 of the second light source package 21B.

[0055] Since the first main surface 22a of the substrate 22 is flat, "the first length W1 is greater than or equal to the second length W2" means that the height of the front surface 212c of the first frame 212 is greater than or equal to the height of the front surface 222c of the second light source package 21B.

[0056] As described above, because the first length W1 is greater than or equal to the second length W2, the second light C2 (i.e., light having the first light color (e.g., blue)) emitted laterally from the second light source package 21B is reflected by the outer surface 212a of the first frame 212 of the adjacent first light source package 21W. As a result, the second light C2 cannot enter the first encapsulating material 213 through the front opening of the first frame 212 (i.e., the second light C2 cannot enter the phosphor 215 contained in the first encapsulating material 213). Therefore, the chance of the second light C2 entering the phosphor 215 of the first light source package 21W and being converted into converted light of a different light color is reduced. Consequently, the reduction of the second light (i.e., light having the first light color) emitted from the second light source package 21B due to a portion of the second light being converted into converted light by the phosphor 215 is suppressed. Furthermore, the increase in converted light emitted from the phosphor 215 of the first light source package 21W due to the conversion of the second light C2 from the second light source package 21B into converted light is suppressed. As a result, the deviation of the light color of the composite light emitted from the light source module 20 from the designed light color (i.e., the color shift of the composite light) can be reduced.

[0057] In this embodiment, as described above, the height of the front surface 213a of the first encapsulant 213 is less than or equal to the height of the front surface 212c of the first frame 212. Therefore, the incidence of the second light C2 from the second light source package 21B onto the phosphor 215 in the first encapsulant 213 through the front opening of the first frame 212 is further reduced. This further reduces the color shift of the composite light emitted from the light source module 20.

[0058] (3) Effects The light source module 20 according to the embodiment comprises a substrate 22 and a plurality of types of light source packages 21. The substrate 22 has a main surface 22a. The plurality of types of light source packages 21 are arranged on the main surface 22a of the substrate 22. The plurality of types of light source packages 21 include a first light source package 21W and a second light source package 21B. The first light source package 21W includes a first light-emitting element 211, a first frame 212, and a first encapsulant 213. The first light-emitting element 211 emits first light having a first light color. The first frame 212 surrounds the first light-emitting element 211 and has light-shielding properties. The first encapsulant 213 is filled inside the first frame 212 so as to cover the first light-emitting element 211. The first encapsulant 213 includes a phosphor 215. The phosphor 215 converts a portion of the first light emitted from the first light-emitting element 211 into converted light having a second light color different from the first light color, and emits the converted light. The second light source package 21B includes a second light-emitting element 221 and a second encapsulant 223. The second light-emitting element 221 emits second light having a first light color. The second encapsulant 223 covers the second light-emitting element 221. The first frame 212 has a rear surface 212d (first surface) and a front surface 212c (second surface). The rear surface 212d faces the substrate 22. The front surface 212c is the surface opposite to the substrate 22. The second light source package 21B has a rear surface 222d (third surface) and a front surface 222c (fourth surface). The rear surface 222d faces the substrate 22. The front surface 222c is the surface opposite to the substrate 22. The first length W1 is greater than or equal to the second length W2. The first length W1 is the length from the rear surface 212d to the front surface 212c of the first frame 212. The second length W2 is the length from the rear surface 222d to the front surface 222c of the second light source package 21B.

[0059] In this configuration, the first length W1 from the rear surface 212d to the front surface 212c of the first frame 212 is greater than or equal to the second length W2 from the rear surface 222d to the front surface 222c of the second light source package 21B. Therefore, the first frame 212 can reduce the incidence of the second light C2 emitted from the second light source package 21B onto the phosphor 215 of the first light source package 21W. As a result, the deviation of the light color of the composite light of the light emitted from the first light source package 21W (i.e., the composite light of the first light and the converted light) and the second light emitted from the second light source package 21B from the designed light color can be reduced. In other words, the color shift of the composite light emitted from the light source module 20 can be reduced.

[0060] Furthermore, even when the first light source package 21W containing the phosphor 215 and the second light source package 21B not containing the phosphor 215 are placed next to each other, the color shift of the combined light can be reduced as described above, allowing the first light source package 21W and the second light source package 21B to be placed closer to each other. This makes it possible to emit light with good color mixing properties (i.e., less color unevenness) from the light source module 20.

[0061] Furthermore, as described above, the incidence of second light from the adjacent second light source package 21B onto the phosphor 215 of the first light source package 21W can be reduced. Therefore, the first light source package 21W containing the phosphor 215 and the second light source package 21B that emits second light that can be converted into converted light to the phosphor 215 can be arranged adjacent to each other, improving the degree of freedom in arranging multiple types of light source packages 21.

[0062] Furthermore, in the light source module 20 according to the embodiment, the first encapsulant 213 has a front surface 213a (fifth surface). The front surface 213a is exposed from the side of the front surface 212c (second surface) of the first frame 212. The height of the front surface 213a of the first encapsulant 213 from the first main surface 22a (main surface) of the substrate 22 is less than or equal to the height of the front surface 212c of the first frame 212 from the first main surface 22a of the substrate 22. With this configuration, the incidence of the second light C2 emitted from the second light source package 21B onto the phosphor 215 contained in the first encapsulant 213 filled inside the first frame 212 from the front surface 212c of the first frame 212 of the first light source package 21W can be further reduced.

[0063] Furthermore, in the light source module 20 according to this embodiment, the second light source package 21B is adjacent to the first light source package 21W. With this configuration, the second light emitted from the second light source package 21B, which is not adjacent to the first light source package 21W, hardly reaches the first light source package 21W. Therefore, by reflecting the second light emitted from the second light source package 21B, which is adjacent to the first light source package 21W, with the first frame 212, the second light emitted from the second light source package 21B can be effectively reflected by the first frame 212.

[0064] Furthermore, in the light source module 20 according to the embodiment, the multiple types of light source packages 21 further include a third light source package 21R and a fourth light source package 21G. The third light source package 21R emits a third light having a third color. The fourth light source package 21G emits a fourth light having a fourth color. The combination of the first, third, and fourth colors is red, blue, and green. The second light source package 21B emits white light. The white light is a composite light obtained by combining the first light emitted from the first light-emitting element 211 and the converted light emitted from the phosphor 215. With this configuration, the color shift of the emitted composite light can be reduced in a light source module 20 capable of emitting full-color composite light.

[0065] Furthermore, the lighting fixture 5 according to the embodiment is a lighting fixture equipped with a light source module 20. The lighting fixture 5 comprises the light source module 20, a fixture body 50, and a light distribution control member 3. The fixture body 50 has an opening 520 and houses the light source module 20. The light distribution control member 3 is housed in the fixture body 50 and is positioned between the light source module 20 and the opening 520, and is positioned to close the opening 520. With this configuration, it is possible to provide a lighting fixture 5 that can reduce color shift of the illuminating light.

[0066] (4) Variations The following describes modifications of the above embodiment. The modifications described below can be implemented in combination. In the modifications described below, the same reference numerals are used for components that are the same as in the above embodiment, and their descriptions may be omitted.

[0067] (4-1) Experimental variation 1 In the above embodiment, the second light source package 21B is shown as being mounted (placed) parallel to the first main surface 22a of the substrate 22 (see Figure 4). However, as shown in Figure 7, the second light source package 21B may be mounted (placed) on the first main surface 22a of the substrate 22 at an angle to the first main surface 22a of the substrate 22 due to mounting errors when soldering h1 to the first main surface 22a of the substrate 22. In the example in Figure 7, the second light source package 21B is tilted such that the front surface 223a of the second encapsulant 223 is tilted toward the first light source package 21W.

[0068] In Modification 1, as in the above embodiment, in the light source module 20, the first length W1 from the rear surface 212d (first surface) to the front surface 212c (second surface) of the first frame 212 of the first light source package 21W is greater than or equal to the second length W2 from the rear surface 222d (third surface) to the front surface 222c (fourth surface) of the second light source package 21B. As a result, even when the second light source package 21B is tilted with respect to the first main surface 22a of the substrate 22, as in Modification 1, the second light C2 emitted from the second light source package 21B is reduced from being reflected by the outer peripheral surface 212a of the first frame 212 of the first light source package 21W and incident on the phosphor 215 of the first light source package 21W, as in the above embodiment. As a result, in Modification 1, as in the above embodiment, the color shift of the composite light emitted from the light source module 20 can be reduced.

[0069] (4-2) Modification 2 In the above embodiment, the case is illustrated in which the outer peripheral surface 212a of the first frame 212 of the first light source package 21W is cylindrical (i.e., the outer peripheral surface 212a is perpendicular to the first main surface 22a of the substrate 22). However, as shown in Figure 8, at least the edge M2 of the outer peripheral surface 212a of the first frame 212 approaches the central axis L1 of the first frame 212 as it moves away from the rear surface 212d of the first frame 212.

[0070] The edge portion M2 is the edge portion on the front surface 212c side of the outer peripheral surface 212a of the first frame 212. In the example shown in Figure 8, as an example, the case is illustrated in which the entire outer peripheral surface 212a approaches the central axis L1 of the first frame 212 as it moves away from the rear surface 212d of the first frame 212.

[0071] According to Modification 2, of the outer peripheral surface 212a of the first frame 212, at least the edge M2 on the front surface 212c side of the first frame 212 approaches the central axis L1 of the first frame 212 as it moves away from the rear surface 212d of the first frame 212. Therefore, at least the edge M2 of the outer peripheral surface 212a of the first frame 212 can effectively reflect the second light C2 incident on the edge M2 of the first frame 212 from the second light source package 21B toward the front of the first light source package 21W. This improves the light extraction efficiency of the light source module 20.

[0072] (4-3) Modification 3 Modification 2 illustrates a case where the entire outer peripheral surface 212a of the first frame 212 approaches the central axis L1 of the first frame 212 as it moves away from the rear surface 212d of the first frame 212. Modification 3 illustrates a case where, as shown in Figure 9, a portion M3 of the outer peripheral surface 212a of the first frame 212 on the rear surface 212d side of the first frame 212 is cylindrical (i.e., a portion M3 is perpendicular to the first main surface 22a of the substrate 22), and the remaining portion M4 approaches the central axis L1 of the first frame 212 as it moves away from the rear surface 212d of the first frame 212. In this case, a portion M3 of the outer peripheral surface 212a of the first frame 212 functions, for example, as a gripping portion for gripping the first light source package 21W in the mounting process of mounting the first light source package 21W onto the substrate 22. This has the advantage of allowing the first light source package 21W to be stably gripped when, for example, the first light source package 21W is mounted on the first main surface 22a of the substrate 22.

[0073] (4-4) Modification 4 In the above embodiment, the case is illustrated in which the outer peripheral surface 212a of the first frame 212 of the first light source package 21W is cylindrical (i.e., the outer peripheral surface 212a is perpendicular to the first main surface 22a of the substrate 22). However, as shown in Figure 10, the outer peripheral surface 212a of the first frame 212 may move away from the central axis L1 of the first frame 212 as it moves away from the rear surface 212d of the first frame 212. In this case as well, the same effects as in the above embodiment can be achieved (i.e., the effect of reducing color shift in the light color of the composite light emitted from the light source module 20 by the same action as in the above embodiment).

[0074] (4-5) Modification 5 In the above embodiment, the reflectivity of the outer peripheral surface 212a of the first frame 212 is formed to be high in the visible light range (400 nm to 650 nm). More specifically, for example, at least the outer peripheral surface 212a of the first frame 212 may be formed of a material with high reflectivity (for example, polycarbonate resin, fluororesin, ceramic, or metal, or a material (resin) in which a white pigment such as titanium oxide powder is dispersed). Alternatively, a paint containing a material with high reflectivity may be applied to the outer peripheral surface 212a. The outer peripheral surface 212a may also be formed in a mirror-like manner. Furthermore, the reflectivity of the outer peripheral surface 212a may be the same as or higher than the reflectivity of the insulating layer of the substrate 22. Additionally, the reflectivity of the outer peripheral surface 212a may be 93% or higher in the visible light range.

[0075] According to Modification 5, the reflectivity of the outer surface 212a of the first frame 212 is formed to be high in the visible light range, so that the second light from the second light source package 21B incident on the outer surface 212a of the first frame 212 can be effectively reflected. As a result, the color shift of the composite light emitted from the light source module 20 can be effectively reduced.

[0076] (4-6) Modification 6 In the above embodiment, it is assumed that the second light source package 21B, the third light source package 21R, and the fourth light source package 21G each include a frame (second frame 222, third frame 232, and fourth frame 242). However, the second light source package 21B, the third light source package 21R, and the fourth light source package 21G do not need to have a frame. That is, of the multiple types of light source packages 21, at least the first light source package 21W needs to include the first frame 212, and the second light source package 21B, the third light source package 21R, and the fourth light source package 21G do not need to have a frame. In this case, the front and rear surfaces of the second light source package 21B, the third light source package 21R, and the fourth light source package 21G are formed by the front and rear surfaces of the sealing material. In this case as well, the same effects as in the above embodiment are achieved.

[0077] (4-7) Modification 7 In Modification 7, in the above embodiment, in the multiple sets of light source packages 21, the first length W1 of the first frame 212 of the first light source package 21W varies depending on the distance (e.g., center-to-center distance) between the first light source package 21W and the adjacent second light source package 21B. More specifically, the first length W1 is longer the closer the distance between the first light source package 21W and the adjacent second light source package 21B. This allows the first length W1 of the first frame 212 to be set to a length that is more optimal for reflecting the second light emitted from the second light source package 21B, depending on the distance between the first light source package 21W and the second light source package 21B.

[0078] (summary) From the embodiments and modifications described above, the following embodiments are disclosed.

[0079] A light source module (20) of the first embodiment comprises a substrate (22) and a plurality of types of light source packages (21). The substrate (22) has a main surface (22a). The plurality of types of light source packages (21) are arranged on the main surface (22a) of the substrate (22). The plurality of types of light source packages (21) include a first light source package (21W) and a second light source package (21B). The first light source package (21W) comprises a first light-emitting element (211), a first frame (212), and a first encapsulant (213). The first light-emitting element (211) emits first light having a first light color. The first frame (212) surrounds the first light-emitting element (211) and has light-shielding properties. The first encapsulant (213) is filled inside the first frame (212) so as to cover the first light-emitting element (211). The first encapsulant (213) includes a phosphor (215). The phosphor (215) converts a portion of the first light emitted from the first light-emitting element (211) into converted light having a second light color different from the first light color, and emits the converted light. The second light source package (21B) includes a second light-emitting element (221) and a second encapsulant (223). The second light-emitting element (221) emits second light having a first light color. The second encapsulant (223) covers the second light-emitting element (221). The first frame (212) has a first surface (212d) and a second surface (212c). The first surface (212d) faces the substrate (22). The second surface (212c) is the surface opposite to the substrate (22). The second light source package (21B) has a third surface (222d) and a fourth surface (222c). The third surface (222d) faces the substrate (22). The fourth surface (222c) is the surface opposite to the substrate (22). The first length (W1) is greater than or equal to the second length (W2). The first length (W1) is the length from the first surface (212d) to the second surface (212c) in the first frame (212). The second length (W2) is the length from the third surface (222d) to the fourth surface (222c) in the second light source package (21B).

[0080] In this configuration, the first length (W1) from the first surface (212d) to the second surface (212c) of the first frame (212) is greater than or equal to the second length (W2) from the third surface (222d) to the fourth surface (222c) of the second light source package (21B). Therefore, the first frame (212) can reduce the incidence of the second light (C2) emitted from the second light source package (21B) onto the phosphor (215) of the first light source package (21W). As a result, the deviation of the light color of the composite light of the light emitted from the first light source package (21W) (composite light of the first light and converted light) and the second light emitted from the second light source package (21B) from the designed light color can be reduced. In other words, the color shift of the composite light emitted from the light source module (20) can be reduced.

[0081] In the light source module (20) of the second embodiment, the first encapsulant (213) has a fifth surface (213a). The fifth surface (213a) is exposed from the side of the second surface (212c) of the first frame (212). The height of the fifth surface (213a) of the first encapsulant (213) from the main surface (22a) of the substrate (22) is less than or equal to the height of the second surface (212c) of the first frame (212) from the main surface (22a) of the substrate (22).

[0082] This configuration further reduces the incidence of the second light (C2) emitted from the second light source package (21B) onto the phosphor (215) contained in the first encapsulating material (213) filled inside the first frame (212) of the first light source package (21W) from the front surface (212c) of the first frame (212).

[0083] In the third embodiment of the light source module (20), in the first or second embodiment, at least the edge (M2) of the outer peripheral surface (212a) of the first frame (212) on the side of the second surface (212c) of the first frame (212) approaches the central axis (L1) of the first frame (212) as it moves away from the first surface (212d) of the first frame (212).

[0084] With this configuration, at least the edge (M2) of the outer surface (212a) of the first frame (212) can effectively reflect the second light incident from the second light source package (21B) to the edge (M2) of the first frame (212) to the front side of the first light source package (21W). This improves the light extraction efficiency of the light source module (20).

[0085] In the light source module (20) of the fourth embodiment, in any one of the first to third embodiments, the second light source package (21B) is adjacent to the first light source package (21W).

[0086] In this configuration, the second light emitted from the second light source package (21B), which is not adjacent to the first light source package (21W), hardly reaches the first light source package (21W). Therefore, by reflecting the second light emitted from the second light source package (21B), which is adjacent to the first light source package (21W), by the first frame (212), the second light emitted from the second light source package (21B) can be effectively reflected by the first frame (212).

[0087] In the fifth embodiment of the light source module (20), in any one of the first to fourth embodiments, multiple sets of light source packages (21) are provided, with multiple types of light source packages (21) forming one set. In the multiple sets of light source packages (21), the first length (W1) of the first frame (212) becomes longer as the distance between the first light source package (21W) and the second light source package (21B) decreases.

[0088] With this configuration, the first length (W1) of the first frame (212) can be set to a length that is more optimal for reflecting the second light emitted from the second light source package (21B), depending on the distance between the first light source package (21W) and the second light source package (21B).

[0089] In the sixth embodiment of the light source module (20), in any one of the first to fifth embodiments, the multiple types of light source packages (21) further include a third light source package (21R) and a fourth light source package (21G). The third light source package (21R) emits a third light having a third color. The fourth light source package (21G) emits a fourth light having a fourth color. The combinations of the first, third, and fourth colors are red, blue, and green. The second light source package (21B) emits white light. The white light is a composite light obtained by combining the first light emitted from the first light-emitting element (211) and the converted light emitted from the phosphor (215).

[0090] This configuration allows for the reduction of color shift in the emitted composite light in a light source module (20) capable of emitting full-color composite light.

[0091] The seventh embodiment of the lighting fixture (5) comprises, in any one of the first to sixth embodiments, a light source module (20), a fixture body (50), and a light distribution control member (3). The fixture body (50) has an opening (520). The fixture body (50) houses the light source module (20). The light distribution control member (3) is housed in the fixture body (50) and is positioned between the light source module (20) and the opening (520) and is positioned to close the opening (520).

[0092] This configuration makes it possible to provide a lighting fixture (5) that can reduce color shift in the light color of the illumination. [Explanation of Symbols]

[0093] 3. Light distribution control member 5 Lighting fixtures 20 Light Source Modules 21W First Light Source Package 21B Second Light Source Package 21R Third Light Source Package 21G 4th Light Source Package 22 circuit boards 22a Main surface 50 Main body of the device 211 First light-emitting element 212 Frame 1 212a Outer surface 212c Front (2nd side) 222c Front (4th side) 212d Rear side (first side) 222d Rear side (3rd side) 213 First sealing material 213a Front (5th side) 215 Phosphors 221 Second light-emitting element 223 Second sealing material 520 opening M2 edge W1 First length W2 Second length L1 center axis

Claims

1. A substrate having a main surface, The substrate comprises a plurality of light source packages, including a first light source package and a second light source package, arranged on the main surface of the substrate, The first light source package is, A first light-emitting element that emits first light having a first color, A first frame body surrounds the first light-emitting element and has light-shielding properties, The first light-emitting element is covered by a first sealing material which is filled inside the first frame, The first encapsulating material includes a phosphor that converts a portion of the first light emitted from the first light-emitting element into converted light having a second light color different from the first light color, and emits the converted light. The second light source package is, A second light-emitting element that emits a second light having the first light color, The device comprises a second sealing material that covers the second light-emitting element, The first frame is The first surface facing the substrate, It has a second surface opposite to the aforementioned substrate, The second light source package is, A third surface facing the aforementioned substrate, It has a fourth surface opposite to the substrate, The first length from the first surface to the second surface in the first frame is greater than or equal to the second length from the third surface to the fourth surface in the second light source package. Light source module.

2. The first sealing material has a fifth surface that is exposed from the side of the second surface of the first frame, The height of the fifth surface from the main surface of the substrate in the first sealing material is less than or equal to the height of the second surface from the main surface of the substrate in the first frame. The light source module according to claim 1.

3. Of the outer circumferential surfaces of the first frame, at least the edge on the side of the second surface of the first frame approaches the central axis of the first frame as it moves away from the first surface of the first frame. The light source module according to claim 1 or 2.

4. The second light source package is adjacent to the first light source package, The light source module according to claim 1 or 2.

5. The aforementioned multiple types of light source packages constitute one set, and the system comprises multiple sets of light source packages. In the aforementioned set of multiple light source packages, the first length of the first frame is longer as the distance between the first light source package and the second light source package decreases. The light source module according to claim 1 or 2.

6. The aforementioned multiple types of light source packages are: A third light source package that emits a third light having a third color, A fourth light source package that emits a fourth light having a fourth color, further comprising The combination of the first, third, and fourth light colors is red, blue, and green. The second light source package emits white light, The white light is a composite light obtained by combining the first light emitted from the first light-emitting element and the converted light emitted from the phosphor. The light source module according to claim 1 or 2.

7. A light source module according to claim 1 or 2, A fixture body having an opening and housing the light source module, The device comprises a light distribution control member housed in the main body of the device, positioned between the light source module and the opening, and positioned to close the opening, Lighting fixtures.

Images