Light-emitting module, air conditioner

Abstract

To provide a light-emitting module in which distribution of light is widened in the long-axis direction of an optical member to include a wide distribution of light in the long-axis direction.SOLUTION: A light-emitting module includes a light source emitting ultraviolet light and an optical member for controlling distribution of light, in which: the optical member has an incident face on which light emitted from the light source is made incident, and a light emission face from which light incident from the incident face is emitted; in a plan view, the optical member has a shape having a long axis and a short axis orthogonal to the long axis; a central axis of the optical member passes through the light source, the incident face and the light emission face, and is orthogonal to a long-axis direction in parallel to the long axis, and a short-axis direction in parallel to the short axis; in a short-axis cross section of the optical member in the surface including the short axis and the central axis, the shape of the incident face is a recessed shape; the incident face has a plane part crossing the central axis and in parallel to the short-axis direction; and in a plan view, the light source is disposed in a region where the incident face is positioned to irradiate the inside of an air conditioner.SELECTED DRAWING: Figure 3C

Description

Technical Field

[0001] The present invention relates to a light-emitting module and an air conditioner.

Background Art

[0002] Patent Document 1 discloses a light-emitting module including a light-emitting diode chip and a lens that disperses the luminous flux of light emitted from the light-emitting diode chip.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a light-emitting module, it is desired that the light distribution of light spreads in the major axis direction of an optical member such as a lens and has a characteristic of having a wider light distribution in the major axis direction. An object of the present invention is to provide a light-emitting module in which the light distribution of light spreads in the major axis direction of an optical member and has a wider light distribution in the major axis direction.

Means for Solving the Problems

[0005] A light-emitting module according to an embodiment of the present invention is a light-emitting module having a light source that emits ultraviolet light and an optical member that controls the light distribution of the light emitted from the light source. The optical member includes an incident surface on which the light emitted from the light source is incident and an exit surface from which the light incident on the incident surface exits. In a plan view, the optical member has a shape having a major axis and a minor axis orthogonal to the major axis. The central axis of the optical member passes through the light source, the incident surface, and the exit surface, and is orthogonal to the major axis direction parallel to the major axis and the minor axis direction parallel to the minor axis. In a minor-axis cross-section of the optical member in a plane including the minor axis and the central axis, the shape of the incident surface is concave, and the incident surface has a flat portion that intersects the central axis and is parallel to the minor axis direction. In a plan view, the light source is provided within a region where the incident surface is located, and the length of the flat portion is 2 times or more and 3 times or less the length of the light source in the minor axis direction, and irradiates the inside of the air conditioner.

Effects of the Invention

[0006] According to the light-emitting module according to an embodiment of the present invention, it is possible to provide a light-emitting module in which the light distribution of light spreads in the major axis direction of the optical member, and a wider light distribution is obtained in the major axis direction.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the light-emitting module according to the present invention will be described. Note that the drawings referred to in the following description schematically show the present invention, so the scale, interval, positional relationship, etc. of each member may be exaggerated, or a part of the member may be omitted. Also, the scale and interval of each member may not match between the top view and the cross-sectional view. In the following description, the same names and reference numerals generally indicate the same or homogeneous members, and detailed descriptions will be omitted as appropriate.

[0009] FIG. 1 is a schematic perspective view of a light-emitting module 100 according to an embodiment of the present invention. The light-emitting module 100 includes a light source 10 and an optical member 20 that controls the light distribution of the light emitted from the light source 10. The housing 50 has a recess, and the light source 10 and the optical member 20 are disposed in the recess of the housing 50.

[0010] As the light source 10, a light emitting element such as a light emitting diode, a light emitting device in which the light emitting element is mounted on a package or the like can be used. As the material of the package used for the light emitting device, ceramics or resin can be used. The emission peak wavelength of the light from the light source 10 is, for example, 250 nm or more and 600 nm or less. For example, by using the light source 10 that emits ultraviolet rays, it can be used as the light emitting module 100 for sterilization or disinfection. The emission peak wavelength of the light source 10 that emits ultraviolet rays is, for example, 310 nm or less. In plan view, the shape of the light source 10 is, for example, substantially rectangular. In the present embodiment, in plan view, the shape of the light source 10 is substantially square. In plan view, the light source 10 can be, for example, a square with a side length of 0.5 mm or more and 4 mm or less. The center of the light source 10 is located at the center of the shape of the light source 10 in plan view.

[0011] FIG. 2 is a schematic perspective view for explaining the arrangement of the light source 10 and the optical member 20 according to an embodiment of the present invention. FIG. 3A is a schematic top view of the light emitting module 100 according to an embodiment of the present invention. FIG. 3B is a schematic cross-sectional view taken along line IIIB-IIIB in FIG. 3A. FIG. 3B is a longitudinal cross-section of the optical member 20 in a plane including the major axis and the central axis of the optical member 20. FIG. 3C is a schematic cross-sectional view taken along line IIIC-IIIC in FIG. 3A. FIG. 3C is a minor axis cross-section of the optical member 20 in a plane including the minor axis and the central axis of the optical member 20.

[0012] As shown in FIG. 2, the optical member 20 is provided so as to cover the light source 10. As shown in FIG. 3A, the optical member 20 has a shape having a major axis and a minor axis orthogonal to the major axis in plan view. The central axis of the optical member 20 passes through the center of the light source 10, the incident surface 21, and the exit surface 22, and is orthogonal to the major axis and the minor axis. The direction parallel to the major axis of the optical member 20 is defined as the major axis direction X. The direction parallel to the minor axis of the optical member 20 is defined as the minor axis direction Y. Further, the direction orthogonal to the major axis direction X and the minor axis direction Y is defined as the central axis direction Z. The central axis of the optical member 20 is a direction parallel to the central axis direction Z.

[0013] The optical member 20 has a shape in which the length in the major axis direction X is longer than the length in the minor axis direction Y. The length L1 of the optical member 20 in the major axis direction X can be 150% or more and 200% or less of the length L2 of the optical member 20 in the minor axis direction Y. By setting the length L1 of the optical member 20 to be 150% or more of the length L2 of the optical member 20, the convex portion 27 described later can be arranged more widely, and it is easy to obtain a wide light distribution in the major axis direction X. By setting the length L1 of the optical member 20 to be 200% or less of the length L2 of the optical member 20, while maintaining the strength of the optical member 20, it is easy to arrange the flat portion 24 described later more widely. The length of the optical member 20 in the major axis direction X can be, for example, 15 mm or more and 20 mm or less. The length of the optical member 20 in the minor axis direction Y can be, for example, 5 mm or more and 10 mm or less. Here, the length of the optical member 20 in the major axis direction X is the longest length of the emission surface 22 described later along the major axis direction X in a plan view. Also, the length of the optical member 20 in the minor axis direction Y described above is the longest length of the emission surface 22 described later along the minor axis direction Y in a plan view.

[0014] As shown in FIGS. 2 and 3A, the optical member 20 has an outer peripheral portion 23 on the outer periphery of the region where the emission surface 22 is arranged. The outer peripheral portion 23 is a portion where the light emitted from the light source 10 hardly passes and has little influence on the light distribution control of the light from the light source 10. The outer peripheral portion 23 has a longer length in the major axis direction X than in the minor axis direction Y. At a position adjacent to the end portion of the outer peripheral portion 23 in the major axis direction X, there is a recessed portion having a shape recessed from the outer edge of the optical member 20 toward the emission surface 22 side. The surface of the outer peripheral portion 23 does not include the incident surface 21 and the emission surface 22.

[0015] As shown in FIGS. 3A to 3C, the optical member 20 includes an incident surface 21 on which the light emitted from the light source 10 is incident, and an emission surface 22 from which the light incident on the incident surface 21 is emitted. The light emitted from the light source 10 passes through the incident surface 21 and the emission surface 22 and is taken out to the outside.

[0016] As shown in FIG. 3A, in a plan view, the length D1 along the major axis direction X of the region where the incident surface 21 is disposed is shorter than the length D2 along the minor axis direction Y of the region where the incident surface 21 is disposed. The length D1 along the major axis direction X of the region where the incident surface 21 is disposed can be 50% or more and 70% or less of the length D2 along the minor axis direction Y of the region where the incident surface 21 is disposed. Thereby, while efficiently condensing the light from the light source 10 on the first incident surface 21A described later, the flat portion 24 can be widely disposed on the second incident surface 21B described later to easily refract the light toward the central axis side of the light source 10. The length D1 along the major axis direction X of the region where the incident surface 21 is disposed can be, for example, 3 mm or more and 7 mm or less. The length D2 along the minor axis direction Y of the region where the incident surface 21 is disposed can be, for example, 7 mm or more and 15 mm or less. Here, the length along the major axis direction X or the minor axis direction Y of the region where the incident surface 21 is disposed is the longest length among the lengths along the major axis direction X or the minor axis direction Y. In a plan view, the region where the incident surface 21 is disposed has a rectangular shape with a long side along the minor axis direction Y. In a plan view, the light source 10 is provided within the region where the incident surface 21 is located. In a plan view, the size of the light source 10 is smaller than the size of the region where the incident surface 21 is located.

[0017] As shown in FIG. 3B, the shape of the incident surface 21 in the major axis cross section of the optical member 20 is a concave shape. Hereinafter, the incident surface 21 in the major axis cross section of the optical member 20 may be referred to as the first incident surface 21A. The first incident surface 21A has a curved surface portion 26 that intersects the central axis of the light source 10. By disposing the curved surface portion 26 directly above the light source 10, it is possible to suppress the light in the vicinity of the central axis of the light source 10 from being emitted narrowly in the major axis direction X. From the viewpoint of easily emitting the light from the light source 10 narrowly in the major axis direction X, the first incident surface 21A is preferably only a curved surface.

[0018] As shown in FIG. 3B, the emission surface 22 in the long-axis cross section of the optical member 20 has a concave portion 28 located in a region including the central axis of the light source 10, and convex portions 27 located on both outer sides of the concave portion 28 and continuous with the concave portion 28. Hereinafter, the emission surface 22 in the long-axis cross section of the optical member 20 may be referred to as a first emission surface 22A. The first emission surface 22A is a continuous curved surface in which the convex portion 27 and the concave portion 28 are connected by a curved surface in the long-axis cross section. The concave portion 28 located directly above the light source 10 can refract the light near the central axis of the light source 10 in a direction spreading in the long-axis direction X. Further, the convex portions 27 located on both outer sides of the concave portion 28 can spread the light from the light source 10 in the long-axis direction X. That is, by making the first emission surface 22A have the above-described shape, the light from the light source 10 incident on the first emission surface 22A can be spread in the long-axis direction X, and the light distribution of the light-emitting module 100 can be made into a wide batwing-shaped light distribution in the long-axis direction X.

[0019] In the central axis direction Z, the height of the concave portion 28 is lower than the height of the convex portion 27. The difference between the height of the concave portion 28 and the height of the convex portion 27 can be, for example, 0.7 mm or more and 1 mm or less. The maximum height of the convex portion 27 can be, for example, 5 mm or more and 7 mm or less. The height of the concave portion 28 can be, for example, 4 mm or more and 6 mm or less.

[0020] As shown in FIG. 3C, the shape of the incident surface 21 in the minor-axis cross section of the optical member 20 is a concave shape. Hereinafter, the incident surface 21 in the minor-axis cross section of the optical member 20 may be referred to as the second incident surface 21B. The second incident surface 21B has a flat portion 24 that intersects the central axis of the light source 10 and is parallel to the minor-axis direction Y. By disposing the flat portion 24 on the second incident surface 21B, the light incident from the light source 10 onto the flat portion 24 can be refracted toward the central axis side of the light source 10, and the light distribution in the minor-axis direction Y can be narrowed. The length of the flat portion 24 is preferably not less than twice and not more than three times the length of the light source 10 in the minor-axis direction Y. By setting the length of the flat portion 24 to be not less than twice and not more than three times the length of the light source 10 in the minor-axis direction Y, the light from the light source 10 can be easily incident on the flat portion 24, and the light distribution in the minor-axis direction Y can be made narrower. The length of the flat portion 24 can be, for example, not less than 5 mm and not more than 10 mm. The flat portion 24 is located above the upper surface of the outer peripheral portion 23.

[0021] The second incident surface 21B has a linear side surface portion 25 that is continuous with the flat portion 24 and inclined with respect to the central axis. The side surface portion 25 is inclined at, for example, not less than 60 degrees and not more than 95 degrees with respect to the central axis. The flat portion 24 and the side surface portion 25 are connected by a curved surface.

[0022] The shape of the exit surface 22 in the minor-axis cross section of the optical member 20 is a convex shape. Hereinafter, the exit surface 22 in the minor-axis cross section of the optical member 20 may be referred to as the second exit surface 22B. The second exit surface 22B has a curved surface portion 29 that intersects the central axis of the light source 10. By disposing the curved surface portion 29 directly above the light source 10, the light passing through the second incident surface 21B can be condensed, and it is possible to suppress the light from spreading and exiting in the minor-axis direction Y. From the viewpoint of facilitating the light from the light source 10 to be emitted narrowly in the minor-axis direction Y, the second exit surface 22B preferably consists only of a curved surface.

[0023] As shown in FIGS. 3B and 3C, the shortest distance D3 between the light source 10 and the incident surface 21 along the major axis direction X is shorter than the shortest distance D4 between the light source 10 and the incident surface 21 along the minor axis direction Y in the minor axis direction Y. Thereby, in the major axis direction X, it is easy to make the light from the light source 10 incident on the first incident surface 21A, and in the minor axis direction Y, it is easy to secure the area for arranging the flat portion 24. In the major axis cross section, the shortest distance D3 between the light source 10 and the incident surface 21 along the major axis direction X is, for example, 0.3 mm or more and 1 mm or less. In the minor axis direction Y, the shortest distance D4 between the light source 10 and the incident surface 21 along the minor axis direction Y is, for example, 2 mm or more and 4 mm or less.

[0024] In the central axis direction Z, the distance between the light source 10 and the incident surface 21 can be, for example, 1.5 mm or more and 3 mm or less.

[0025] For the optical member 20, a material having translucency with respect to the light from the light source 10 is used. As the material of the optical member 20, for example, resins such as acrylic, cycloolefin, cycloolefin copolymer, epoxy, and silicone can be used.

[0026] FIGS. 4 and 5 are schematic diagrams showing the light path when the light emitted from the center of the light source 10 enters the optical member 20 when the optical member 20 of the present embodiment is used. FIG. 4 shows the light path in the major axis cross section, and FIG. 5 shows the light path in the minor axis cross section. As shown in FIG. 4, it can be seen that the light distribution spreads when the light emitted from the light source 10 is taken out to the outside through the first incident surface 21A and the first emission surface 22A. As shown in FIG. 5, it can be seen that the light distribution becomes narrow when the light emitted from the light source 10 is taken out to the outside through the second incident surface 21B and the second emission surface 22B. For example, the light distribution becomes narrow because the light rays passing through the flat portion 24 of the second incident surface 21B are refracted toward the central axis side of the light source 10.

[0027] FIG. 6 is a schematic top view showing a modification of the present embodiment. The modification of the present embodiment is substantially the same as the configuration of the light emitting module 100 except that the arrangement of the light source 10 is different as shown in FIG. 6.

[0028] In the light emitting module 100 shown in FIG. 3A, one side of the light source 10 is arranged parallel to the major axis direction X or the minor axis direction Y, whereas in the modification of the present embodiment, as shown in FIG. 6, one side of the light source 10 is arranged at an angle of about 45 degrees with respect to the major axis direction X or the minor axis direction Y. By arranging one side of the light emitting surface of the light source 10 at an angle of about 45 degrees with respect to the major axis direction X or the minor axis direction Y in such an arrangement, the distance from the center of the light source to one side of the light source 10 in the direction inclined at about 45 degrees with respect to the major axis direction X or the minor axis direction Y can be made shorter than that of the light emitting module 100 shown in FIG. 3A. Therefore, the optical design necessary to obtain a wide light distribution in the major axis direction X becomes easier than when one side of the light source 10 is arranged parallel to the major axis direction X or the minor axis direction Y. When a light emitting device is used as the light source 10, one side of the package on which the light emitting element is mounted may be arranged parallel to the major axis direction X or the minor axis direction Y, while one side of the light emitting surface of the light emitting element is arranged at an angle of about 45 degrees with respect to the major axis direction X or the minor axis direction Y.

[0029] Figs. 7 and 8 are diagrams showing application examples using the light-emitting module 100 of the present embodiment. In this application example, two light-emitting modules 100 are arranged on the support substrate 30, and the two light-emitting modules 100 are electrically connected by the conductive member 40. The shape of the support substrate 30 in plan view can be, for example, rectangular. In top view, the straight line connecting the centers of the light sources 10 of the two light-emitting modules 100 is preferably parallel to the long side of the support substrate 30. The distance between the two light-emitting modules 100 can be, for example, 150 mm or more and 250 mm or less. Here, the distance between the two light-emitting modules is the distance between the centers of the light sources 10 included in the light-emitting module 100. By arranging the light-emitting modules 100 on the rectangular support substrate 30, a light distribution spreading in the longitudinal direction of the support substrate 30 can be obtained. For example, when irradiating an elongated region using the light-emitting module 100, this application example can be used to efficiently irradiate a rectangular region. As shown in Fig. 8, the support substrate 30 is joined to the support 60, and the surface of the substrate 70 to be irradiated and the light-emitting module 100 are arranged to face each other. By arranging in this way, the light from the light-emitting module 100 indicated by the dotted line in Fig. 8 spreads in the longitudinal direction of the support substrate 30, and the surface of the substrate 70 along the longitudinal direction of the support substrate 30 can be irradiated.

[0030] For the housing 50, for example, resins such as polycarbonate, epoxy, silicone, and fluororesin can be used. As shown in Figs. 1 and 7, a circular hole 51 is provided in the housing 50 outside the optical member 20 in the long-axis direction X, and the light-emitting module 100 can be fixed to the support substrate 30 by inserting a screw or the like into this hole 51. A base material made of aluminum or the like is joined in the recess of the housing 50 via a joining member. A glass epoxy substrate or a glass composite substrate may be used for the base material. The light source 10 is arranged on the base material and is electrically connected to the base material. A part of the base material is exposed in the region where the recess of the outer peripheral portion 23 described above is arranged, and the conductive member 40 is electrically connected to the exposed portion of the base material. Further, after electrically connecting the base material and the conductive member 40, a waterproof structure can be formed by covering the connection portion with resin or the like.

[0031] The light-emitting module 100 of the present invention can be used, for example, to irradiate the drain pan and heat exchanger inside an air conditioner to suppress the generation of mold occurring in the drain pan. Also, it is considered that by using the light-emitting module 100 of the present invention in a humidifier, an air purifier, etc. where moisture easily remains inside the product, an effect of suppressing the generation of mold can be obtained.

Explanation of Reference Numerals

[0032] 10 Light source 20 Optical member 21 Incident surface 21A First incident surface 21B Second incident surface 22 Exit surface 22A First exit surface 22B Second exit surface 23 Outer peripheral portion 24 Flat portion 25 Side surface portion 26 Curved surface portion 27 Convex portion 28 Concave portion 29 Curved surface portion 30 Support substrate 40 Conductive member 50 Housing 51 Hole portion 60 Support 70 Substrate 100 Light-emitting module X Long-axis direction Y Short-axis direction Z Central-axis direction

Claims

1. A light-emitting module having a light source that emits ultraviolet light and an optical member that controls the light distribution of the light emitted from the light source, wherein the optical member includes an incident surface on which the light emitted from the light source is incident and an exit surface from which the light incident on the incident surface exits, in a plan view, the optical member has a shape having a major axis and a minor axis orthogonal to the major axis, and a central axis of the optical member passes through the light source, the incident surface, and the exit surface and is orthogonal to a major axis direction parallel to the major axis and a minor axis direction parallel to the minor axis, in a minor-axis cross section of the optical member in a plane including the minor axis and the central axis, the shape of the incident surface is concave, and the incident surface has a flat portion that intersects the central axis and is parallel to the minor axis direction, in a plan view, the light source is provided within a region where the incident surface is located, the length of the flat portion is not less than twice and not more than three times the length of the light source in the minor axis direction, A light-emitting module for irradiating the interior of an air conditioner.

2. A light-emitting module having a light source that emits ultraviolet light and an optical member that controls the light distribution of the light emitted from the light source, wherein the optical member includes an incident surface on which the light emitted from the light source is incident and an exit surface from which the light incident on the incident surface exits, in a plan view, the optical member has a shape having a major axis and a minor axis orthogonal to the major axis, and a central axis of the optical member passes through the light source, the incident surface, and the exit surface and is orthogonal to a major axis direction parallel to the major axis and a minor axis direction parallel to the minor axis, in a minor-axis cross section of the optical member in a plane including the minor axis and the central axis, the shape of the incident surface is concave, and the incident surface has a flat portion that intersects the central axis and is parallel to the minor axis direction, in a plan view, the light source is provided within a region where the incident surface is located, in the minor-axis cross section, the incident surface has a linear side portion that is continuous with the flat portion and is inclined with respect to the central axis, A light-emitting module for irradiating the interior of an air conditioner.

3. In a major-axis cross section of the optical member in a plane including the major axis and the central axis, the shape of the incident surface is concave, and the incident surface has a curved surface portion that intersects the central axis, the light-emitting module according to claim 1 or 2.

4. An air conditioner having the light-emitting module according to any one of claims 1 to 3.

5. having a drain pan inside, The air conditioner according to claim 4, wherein the light emitting module irradiates the drain pan.

6. having a heat exchanger inside, The air conditioner according to claim 4 or 5, wherein the light emitting module irradiates the heat exchanger.

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