Light-emitting module and 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 technology]

[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 documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2010-524170 Summary of the Invention [Problem to be solved by the invention]

[0004] In a light-emitting module, it is desirable for the light distribution to spread in the long axis direction of an optical member such as a lens, and for the light distribution to be wider in the long axis direction. The present invention aims to provide a light-emitting module in which the light distribution spreads in the long axis direction of an optical member, and has a wider light distribution in the long axis direction. [Means for solving the problem]

[0005] An embodiment of the present invention provides an optical module having a light source that emits ultraviolet light and an optical element that controls the distribution of light emitted from the light source, the optical element including an entrance surface into which the light emitted from the light source is incident and an exit surface from which the light incident on the entrance surface is emitted, and in a planar view, the optical element has a shape having a long axis and a short axis perpendicular to the long axis, the central axis of the optical element passes through the light source, the entrance surface, and the exit surface, and is perpendicular to a long axis direction parallel to the long axis and a short axis direction parallel to the short axis, and in a short axis cross section of the optical element in a plane including the short axis and the central axis, the shape of the entrance surface is concave, and the entrance surface has a planar portion that intersects with the central axis and is parallel to the short axis direction, and in a planar view, the light source is provided within a region in which the entrance surface is located, and the length of the planar portion is between two and three times the length of the light source in the short axis direction, and the air conditioner is irradiated. Effect of the Invention

[0006] According to the light-emitting module of one embodiment of the present invention, it is possible to provide a light-emitting module in which the light distribution spreads in the major axis direction of the optical member, thereby obtaining a wider light distribution in the major axis direction. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic perspective view showing a light-emitting module according to one embodiment of the present invention; [Diagram 2] 2 is a schematic perspective view for explaining the arrangement of a light source and optical members of a light emitting module according to one embodiment of the present invention; FIG. [Figure 3A] 1 is a schematic top view of a light-emitting module according to one embodiment of the present invention; [Figure 3B] FIG. 3B is a schematic cross-sectional view taken along line IIIB-IIIB in FIG. 3A. [Figure 3C] FIG. 3B is a schematic cross-sectional view taken along line IIIC-IIIC in FIG. 3A. [Figure 4] FIG. 2 is a schematic diagram illustrating a ray path according to an embodiment of the present invention. [Diagram 5]FIG. 2 is a schematic diagram illustrating a ray path according to an embodiment of the present invention. [Figure 6] FIG. 13 is a schematic top view of a light-emitting module according to a modified example of the present invention. [Figure 7] 1 is a schematic top view for explaining an application example using a light-emitting module according to an embodiment of the present invention. FIG. [Figure 8] 1 is a schematic top view for explaining an application example using a light-emitting module according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the light emitting module according to the present invention will be described. The drawings referred to in the following description are schematic illustrations of the present invention, and therefore the scale, interval, and positional relationship of each component may be exaggerated, or some components may not be shown. In addition, the scale and interval of each component may not match between the top view and the cross-sectional view. In the following description, the same names and symbols generally indicate the same or similar components, and detailed descriptions will be omitted as appropriate.

[0009] 1 is a schematic perspective view of a light emitting module 100 according to one embodiment of the present invention. The light emitting module 100 includes a light source 10 and an optical member 20 that controls the distribution of light emitted from the light source 10. A 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] The light source 10 may be a light emitting element such as a light emitting diode, a light emitting device in which a light emitting element is mounted in a package, or the like. The material of the package used in the light emitting device may be ceramics or resin. The light 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 light, it may be used as a light emitting module 100 for sterilization or sterilization. The light source 10 that emits ultraviolet light has an emission peak wavelength of, for example, 310 nm or less. In a plan view, the shape of the light source 10 is, for example, approximately rectangular. In this embodiment, the shape of the light source 10 is approximately square in a plan view. In a plan view, the light source 10 may be, for example, a square with one side 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 a plan view.

[0011] Fig. 2 is a schematic perspective view for explaining the arrangement of a light source 10 and an optical member 20 according to one embodiment of the present invention. Fig. 3A is a schematic top view of a light emitting module 100 according to one 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 long-axis cross-section of the optical member 20 in a plane including the long axis and 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 short-axis cross-section of the optical member 20 in a plane including the short axis and central axis of the optical member 20.

[0012] As shown in FIG. 2, the optical member 20 is provided to cover the light source 10. As shown in FIG. 3A, the optical member 20 has a shape having a long axis and a short axis perpendicular to the long axis in a 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 perpendicular to the long axis and the short axis. The direction parallel to the long axis of the optical member 20 is the long axis direction X. The direction parallel to the short axis of the optical member 20 is the short axis direction Y. In addition, the direction perpendicular to the long axis direction X and the short axis direction Y is the central axis direction Z. The central axis of the optical member 20 is parallel to the central axis direction Z.

[0013] The optical member 20 has a shape in which the length in the long axis direction X is longer than the length in the short axis direction Y. The length L1 of the optical member 20 in the long axis direction X can be 150% or more and 200% or less of the length L2 of the optical member 20 in the short axis direction Y. By making the length L1 of the optical member 20 150% 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 achieve a wide light distribution in the long axis direction X. By making the length L1 of the optical member 20 200% or less of the length L2 of the optical member 20, it is easy to arrange the flat portion 24 described later more widely while maintaining the strength of the optical member 20. The length of the optical member 20 in the long 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 short 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 long axis direction X is the longest length of the exit surface 22 described later along the long axis direction X in a plan view. Moreover, the length of the optical member 20 in the minor axis direction Y is the longest length of an exit surface 22 (described later) along the minor axis direction Y in a plan view.

[0014] 2 and 3A, the optical member 20 has an outer peripheral portion 23 on the outer periphery of the region where the exit surface 22 is disposed. The outer peripheral portion 23 is a portion through which the light emitted from the light source 10 does not easily pass, and has almost no effect on the light distribution control of the light from the light source 10. The length of the outer peripheral portion 23 in the major axis direction X is longer than the length of the minor axis direction Y. A recessed portion recessed from the outer edge of the optical member 20 toward the exit surface 22 is provided at a position adjacent to the end of the outer peripheral portion 23 in the major axis direction X. The surface of the outer peripheral portion 23 does not include the entrance surface 21 and the exit surface 22.

[0015] 3A to 3C, optical member 20 includes an incident surface 21 into which light emitted from light source 10 is incident, and an exit surface 22 from which the light incident on incident surface 21 is emitted. The light emitted from light source 10 passes through incident surface 21 and exit surface 22 and is extracted to the outside.

[0016] As shown in FIG. 3A, in a plan view, the length D1 along the long axis direction X of the region where the incident surface 21 is arranged is shorter than the length D2 along the short axis direction Y of the region where the incident surface 21 is arranged. The length D1 along the long axis direction X of the region where the incident surface 21 is arranged can be 50% to 70% of the length D2 along the short axis direction Y of the region where the incident surface 21 is arranged. This makes it possible to efficiently collect light from the light source 10 at the first incident surface 21A described later, while refracting the light toward the central axis of the light source 10 by widely arranging the flat portion 24 on the second incident surface 21B described later. The length D1 along the long axis direction X of the region where the incident surface 21 is arranged can be, for example, 3 mm to 7 mm. The length D2 along the short axis direction Y of the region where the incident surface 21 is arranged can be, for example, 7 mm to 15 mm. Here, the length along the long axis direction X or the short axis direction Y of the region where the incident surface 21 is arranged is the longest length among the lengths along the long axis direction X or the short axis direction Y. In a plan view, the region in which the incident surface 21 is disposed has a rectangular shape having a long side along the short axis direction Y. In a plan view, the light source 10 is provided in the region in which 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 in which the incident surface 21 is located.

[0017] As shown in FIG. 3B, the shape of the incident surface 21 in the long-axis cross section of the optical member 20 is concave. Hereinafter, the incident surface 21 in the long-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 with 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 prevent light in the vicinity of the central axis of the light source 10 from being narrowed in the long-axis direction X and being emitted. From the viewpoint of making it easier to emit light from the light source 10 in a narrow manner in the long-axis direction X, it is preferable that the first incident surface 21A is only a curved surface.

[0018] As shown in FIG. 3B, the exit surface 22 in the longitudinal 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 a convex portion 27 located on both outer sides of the concave portion 28 and continuous with the concave portion 28. Hereinafter, the exit surface 22 in the longitudinal cross section of the optical member 20 may be referred to as a first exit surface 22A. The first exit 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 longitudinal cross section. The concave portion 28 located directly above the light source 10 can refract light in the vicinity of the central axis of the light source 10 in a direction spreading in the longitudinal axis direction X. In addition, 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 longitudinal axis direction X. In other words, by giving first exit surface 22A the above-mentioned shape, the light from light source 10 that is incident on first exit surface 22A can be spread in the long-axis direction X, and the light distribution of light-emitting module 100 can be made to have a batwing-like light distribution that is wide 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 in height between the concave portion 28 and the convex portion 27 may be, for example, 0.7 mm or more and 1 mm or less. The maximum height of the convex portion 27 may be, for example, 5 mm or more and 7 mm or less. The height of the concave portion 28 may 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 short-axis cross section of the optical member 20 is concave. Hereinafter, the incident surface 21 in the short-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 planar portion 24 that intersects with the central axis of the light source 10 and is parallel to the short-axis direction Y. By disposing the planar portion 24 on the second incident surface 21B, the light incident from the light source 10 to the planar portion 24 can be refracted toward the central axis of the light source 10, and the light distribution in the short-axis direction Y can be narrowed. The length of the planar portion 24 is preferably two or more and three times or less than the length of the light source 10 in the short-axis direction Y. By making the length of the planar portion 24 two or more and three times or less than the length of the light source 10 in the short-axis direction Y, the light from the light source 10 can be easily incident on the planar portion 24, and the light distribution in the short-axis direction Y can be narrowed further. The length of the planar portion 24 can be, for example, 5 mm or more and 10 mm or less. The flat portion 24 is located above the upper surface of the outer circumferential portion 23 .

[0021] The second entrance surface 21B has a linear side portion 25 that is continuous with the flat portion 24 and inclined with respect to the central axis. The side portion 25 is inclined with respect to the central axis at an angle of, for example, 60 degrees or more and 95 degrees or less. The flat portion 24 and the side portion 25 are connected by a curved surface.

[0022] The shape of the exit surface 22 in the short-axis cross section of the optical member 20 is a convex shape. Hereinafter, the exit surface 22 in the short-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 with 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 entrance surface 21B can be condensed and prevented from being emitted in a wide range in the short-axis direction Y. From the viewpoint of making it easier to emit the light from the light source 10 narrowly in the short-axis direction Y, it is preferable that the second exit surface 22B is only a curved surface.

[0023] As shown in FIG. 3B and FIG. 3C, the shortest distance D3 between the light source 10 and the incident surface 21 along the long axis direction X is shorter than the shortest distance D4 between the light source 10 and the incident surface 21 along the short axis direction Y. This makes it easier to make the light from the light source 10 enter the first incident surface 21A in the long axis direction X, and makes it easier to ensure an area for arranging the planar portion 24 in the short axis direction Y. In the long axis cross section, the shortest distance D3 between the light source 10 and the incident surface 21 along the long axis direction X is, for example, 0.3 mm or more and 1 mm or less. In the short axis direction Y, the shortest distance D4 between the light source 10 and the incident surface 21 along the short 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 set to, for example, 1.5 mm or more and 3 mm or less.

[0025] The optical member 20 is made of a material that is translucent to the light from the light source 10. The material of the optical member 20 may be, for example, an acrylic, cycloolefin, cycloolefin copolymer, epoxy, or silicone resin.

[0026] 4 and 5 are schematic diagrams showing the path of light emitted from the center of the light source 10 when the optical member 20 of this embodiment is used, when the light is incident on the optical member 20. FIG. 4 shows the path of light in the long axis cross section, and FIG. 5 shows the path of light in the short axis cross section. As shown in FIG. 4, it can be seen that the light emitted from the light source 10 is extracted to the outside through the first entrance surface 21A and the first exit surface 22A, so that the light distribution is widened. As shown in FIG. 5, it can be seen that the light emitted from the light source 10 is extracted to the outside through the second entrance surface 21B and the second exit surface 22B, so that the light distribution is narrowed. For example, the light passing through the flat portion 24 of the second entrance surface 21B is refracted toward the central axis of the light source 10, so that the light distribution is narrowed.

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

[0028] In the light-emitting module 100 shown in FIG. 3A, one side of the light source 10 is arranged parallel to the long axis direction X or the short axis direction Y, whereas in the modified example of this embodiment, as shown in FIG. 6, one side of the light source 10 is arranged at an inclination of about 45 degrees with respect to the long axis direction X or the short axis direction Y. By arranging one side of the light-emitting surface of the light source 10 at an inclination of about 45 degrees with respect to the long axis direction X or the short axis direction Y in such an arrangement, the distance from the light source center to one side of the light source 10 in the direction inclined at about 45 degrees with respect to the long axis direction X or the short axis direction Y can be made shorter than that of the light-emitting module 100 shown in FIG. 3A. Therefore, the optical design required to obtain a wide light distribution in the long axis direction X is easier than the case where one side of the light source 10 is arranged parallel to the long axis direction X or the short axis direction Y. Note that, 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 long axis direction X or the short axis direction Y, while one side of the light-emitting surface of the light-emitting element may be arranged at an inclination of about 45 degrees with respect to the long axis direction X or the short axis direction Y.

[0029] 7 and 8 are diagrams showing an application example using the light emitting module 100 of the present embodiment. In this application example, two light emitting modules 100 are arranged on a support substrate 30, and the two light emitting modules 100 are electrically connected by a conductive member 40. The shape of the support substrate 30 in a plan view can be, for example, rectangular. In a top view, a 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 of the light emitting modules 100. By arranging the light emitting modules 100 on the rectangular support substrate 30, a light distribution that spreads in the longitudinal direction of the support substrate 30 can be obtained. For example, when a long and narrow area is irradiated using the light emitting module 100, the rectangular area can be efficiently irradiated by using this application example. 8, the support substrate 30 is joined to the support body 60, and the light-emitting module 100 is disposed so as to face the surface of the base 70 to be irradiated. By disposing in this manner, 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 base 70 along the longitudinal direction of the support substrate 30 can be irradiated.

[0030] The housing 50 may be made of, for example, polycarbonate, epoxy, silicone resin, or fluororesin. As shown in FIG. 1 and FIG. 7, the housing 50 has a circular hole 51 on the outside of 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 the hole 51. A base material made of aluminum or the like is bonded to the recess of the housing 50 via a bonding member. The base material may be a glass epoxy substrate or a glass composite substrate. The light source 10 is disposed on the base material and electrically connected to the base material. A part of the base material is exposed in the region where the recess of the outer periphery 23 is disposed, and the conductive member 40 is electrically connected to the exposed part of the base material. In addition, after electrically connecting the base material and the conductive member 40, the connection part can be covered with a resin or the like to provide a waterproof structure.

[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 growth of mold in the drain pan. It is also believed that the effect of suppressing the growth of mold can be obtained by using the light-emitting module 100 of the present invention in humidifiers, air purifiers, and other products in which moisture is likely to remain inside. [Explanation of symbols]

[0032] 10 light source 20 Optical Components 21 Entrance plane 21A 1st entrance plane 21B 2nd entrance plane 22 Exit surface 22A 1st exit surface 22B 2nd exit surface 23 Outer periphery 24 Plane section 25 Side part 26 Curved part 27 Convex part 28 Concave part 29 Curved part 30 Support substrate 40 Conductive materials 50 Case 51 Hole 60 Support 70 Substrate 100 Light Emitting Module X Long axis direction Y short axis direction Z center axis direction

Claims

1. A light emitting module having a light source that emits ultraviolet light and an optical member that controls a light distribution of the light emitted from the light source, the optical member includes an incident surface onto which the light emitted from the light source is incident, and an exit surface from which the light incident on the incident surface is exited, In a plan view, the optical member has a shape having a long axis and a short axis perpendicular to the long axis, and a central axis of the optical member passes through the light source, the incident surface, and the exit surface, and is perpendicular to a long axis direction parallel to the long axis and a short axis direction parallel to the short axis, In a minor axis cross section of the optical member taken along a plane including the minor axis and the central axis, the incidence surface has a concave shape, and the incidence surface has a flat portion that intersects with the central axis and is parallel to the minor axis direction, In a plan view, the light source is provided within a region in which the incident surface is located, The length of the planar portion is two to three times the length of the light source in the short axis direction, An illuminating module that illuminates the inside of the air conditioner.

2. A light emitting module having a light source that emits ultraviolet light and an optical member that controls a light distribution of the light emitted from the light source, the optical member includes an incident surface onto which the light emitted from the light source is incident, and an exit surface from which the light incident on the incident surface is exited, In a plan view, the optical member has a shape having a long axis and a short axis perpendicular to the long axis, and a central axis of the optical member passes through the light source, the incident surface, and the exit surface, and is perpendicular to a long axis direction parallel to the long axis and a short axis direction parallel to the short axis, In a minor axis cross section of the optical member taken along a plane including the minor axis and the central axis, the incidence surface has a concave shape, and the incidence surface has a flat portion that intersects with the central axis and is parallel to the minor axis direction, In a plan view, the light source is provided within a region in which the incident surface is located, In the short-axis cross section, the entrance surface has a linear side portion that is continuous with the flat portion and inclined with respect to the central axis, An illuminating module that illuminates the inside of the air conditioner.

3. In a longitudinal cross section of the optical member taken along a plane including the longitudinal axis and the central axis, The light emitting module according to claim 1 , wherein the entrance surface has a concave shape, and the entrance surface has a curved portion that intersects with the central axis.

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

5. It has a drain pan inside, The air conditioner according to claim 4 , wherein the light emitting module illuminates the drain pan.

6. It has 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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