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EP-4739043-A1 - LIGHT SOURCE MODULE AND ULTRAVIOLET LIGHT FLUID PROCESSING DEVICE

EP4739043A1EP 4739043 A1EP4739043 A1EP 4739043A1EP-4739043-A1

Abstract

A light source module includes a substrate, light sources positioned on an upper surface of the substrate, and an optical member including light control parts and positioned above the substrate such that the light sources are located between the substrate and the optical member.

Inventors

  • SANO, HIROKI

Assignees

  • NICHIA CORPORATION

Dates

Publication Date
20260506
Application Date
20251029

Claims (15)

  1. A light source module comprising: a substrate having a center region and an outer region located outward of the center region; light sources positioned on an upper surface of the substrate and comprising a plurality of first light emitting parts; and an optical member positioned above the substrate such that the light sources are located between the substrate and the optical member, the optical member comprising light control parts that comprise a plurality of first light control parts, wherein each of the plurality of first light control parts overlaps with a respective one of the plurality of first light emitting parts in a top view so as to constitute each of a plurality of first stacked bodies positioned in the outer region, wherein, in each of the plurality of first stacked bodies, the first light control part comprises: a first incident surface that is planar in shape and that faces a corresponding first light emitting part of the plurality of first light emitting parts; and a first emission surface that is curved to be convex in a direction away from the first incident surface, wherein, in each of the plurality of first stacked bodies, cross sections along a first axis that passes through a center of the first emission surface in the top view and that is perpendicular to the first incident surface include a first cross section in which curvatures of both sides of the first emission surface with respect to the first axis are different from each other, and wherein, in at least one of the plurality of first stacked bodies, an optical axis of the corresponding first light control part is non-parallel to the first axis.
  2. The light source module according to claim 1, wherein, in at least one of the plurality of first stacked bodies, in the top view, a center of a light emitting surface of the corresponding first light emitting part is included in the first cross section.
  3. The light source module according to claim 1, wherein, in each one of the plurality of first stacked bodies, the cross sections along the first axis include a second cross section in which both sides of the first emission surface with respect to the first axis have a same curvature, the second cross section being perpendicular to the first cross section, and wherein, in at least one of the plurality of first stacked bodies, in the top view: an extending line of the first cross section passes through the center region of the substrate; and in the first cross section, a side of the first emission surface located closer to the center region relative to the first axis has a smaller curvature than a side of the first emission surface located farther from the center region relative to the first axis.
  4. The light source module according to claim 3, wherein, in each of the plurality of first stacked bodies, an optical axis of the first light control part is non-parallel to the first axis, wherein, in each of the plurality of first stacked bodies, the cross sections including the first axis include the second cross section, and wherein, in each of the plurality of first stacked bodies, in top view: the extending line of the first cross section passes through the center region of the substrate; and in the first cross section, a side of the first emission surface located closer to the center region relative to the first axis has a smaller curvature than a side of the first emission surface located farther from the center region relative to the first axis.
  5. The light source module according to claim 1, wherein, in each of the plurality of first stacked bodies, an optical axis of the first light control part is non-parallel to the first axis, wherein, in each of the plurality of first stacked bodies, the cross sections including the first axis include a second cross section in which both sides of the first emission surface with respect to the first axis have a same curvature, the second cross section being perpendicular to the first cross section, wherein, a plurality of said first cross sections, each included in a respective one of the plurality of first stacked bodies, are parallel to each other in top view, and wherein, a positional relationship between a side of the first emission surface having a larger curvature and a side of the first emission surface having a smaller curvature with respect to the first axis is the same across the plurality of said first cross sections.
  6. The light source module according to claim 1, wherein the light sources further include one or more second light emitting parts, wherein the light control parts further include one or more second light control parts, wherein the one or more second light control parts overlap with the one or more second light emitting parts in the top view so as to constitute one or more second stacked bodies, a number of the one or more second stacked bodies being the same as the number of the one or more second light control parts, wherein the second stacked bodies are positioned in the center region, and wherein, in each of the second stacked bodies, a corresponding second light control part among the one or more second light control parts includes: a second incident surface that is planar in shape and that faces a corresponding second light emitting part of the one or more second light emitting parts; and a second emission surface that is curved to be convex in a direction away from the second incident surface.
  7. The light source module according to claim 6, wherein the light sources further include a plurality of third light emitting parts, wherein the light control parts further include a plurality of third light control parts, wherein each of the plurality of third light control parts overlaps with a respective one of the plurality of third light emitting parts in the top view so as to constitute each of a plurality of third stacked bodies, wherein the substrate has a middle region between the center region and the outer region, wherein the plurality of third stacked bodies are positioned in the middle region, wherein, in each of the plurality of third stacked bodies, the third light control part comprises: a third incident surface that is planar in shape and that faces a corresponding third light emitting part of the plurality of third light emitting parts; and a third emission surface that is curved to be convex in a direction away from the third incident surface, wherein, in each of the plurality of third stacked bodies, cross sections including a third axis that passes through a center of the third emission surface in the top view and that is perpendicular to the third incident surface include a fourth cross section in which curvatures of both sides of the third emission surface with respect to the third axis are different from each other, and wherein, in at least one of the plurality of third stacked bodies, an optical axis of the third light control part is non-parallel to the third axis.
  8. The light source module according to claim 7, wherein, in at least one of the plurality of third stacked bodies, a center of a light emitting surface of the third light emitting part is included in the fourth cross section in top view.
  9. The light source module according to claim 8, wherein, in each of the plurality of third stacked bodies, the cross sections including the third axis include a fifth cross section in which both sides of the third emission surface with respect to the third axis have a same curvature, the fifth cross section being perpendicular to the fourth cross section, and wherein, in the at least one of the plurality of third stacked bodies, in top view: an extending line of the fourth cross section passes through the center region of the substrate; and in the fourth cross section, a side of the third emission surface located nearer to the center region relative to the third axis has a smaller curvature than a side of the third emission surface located farther from the center region relative to the third axis.
  10. The light source module of claim 9, wherein, in each of the plurality of third stacked bodies, an optical axis of the third light control part is non-parallel to the third axis, wherein, in each of the plurality of third stacked bodies, the cross sections each taken along the third axis include the fifth cross section, and wherein, in each of the plurality of third stacked bodies, in the top view: the extending line of the fourth cross section passes through the center region of the substrate; and in the fourth cross section, the side of the third emission surface located closer to the center region relative to the third axis has a smaller curvature than the side of the third emission surface located farther from the center region relative to the third axis.
  11. The light source module according to claim 10, wherein the light sources further include one or more second light emitting parts, wherein the light control parts further include one or more second light control parts, wherein the one or more second light control parts and the one or more second light emitting parts overlap with each other in top view so as to constitute one or more second stacked bodies a number of the second stacked bodies being the same as the number of the one or more second light control parts, wherein the second stacked bodies are positioned in the center region, wherein, in each of the second stacked bodies, the second light control part comprises: a second incident surface that is planar in shape and that faced a corresponding second light emitting part among the one or more second light emitting parts; and a second emission surface that is curved to be convex in a direction away from the second incident surface.
  12. The light source module according to claim 11, wherein the light sources further include a plurality of third light emitting parts, wherein the light control parts further include a plurality of third light control parts, wherein each of the plurality of third light control parts overlap with a respective one of the plurality of third light emitting parts in the top view so as to constitute a respective one of a plurality of third stacked bodies, wherein the substrate has a middle region between the center region and the outer region, wherein the plurality of third stacked bodies are positioned in the middle region, wherein, in each of the plurality of third stacked bodies, the third light control part comprises: a third incident surface that is planar in shape and oriented to face a corresponding third light emitting part among the plurality of third light emitting parts; and a third emission surface that is curved to be convex in a direction away from the third incident surface, wherein, in each of the plurality of third stacked bodies, cross sections each taken along a third axis that passes through a center of the third emission surface in top view and that is perpendicular to the third incident surface include a fourth cross section in which curvatures of both sides of the third emission surface with respect to the third axis are different from each other, and wherein, in at least one of the plurality of third stacked bodies, an optical axis of the third light control part is non-parallel to the third axis.
  13. The light source module of claim 12, wherein, in each of the plurality of third stacked bodies, an optical axis of the corresponding third light control part is non-parallel to the third axis, wherein, in each of the plurality of third stacked bodies, the cross sections including the third axis include a fifth cross section in which both sides of the third emission surface with respect to the third axis have a same curvature, the fifth cross section being perpendicular to the fourth cross section, wherein, a plurality of said fourth cross sections, each included in a respective one of the plurality of third stacked bodies, are parallel to the first cross section in top view, and wherein the positional relationship between a side of the third emission surface having a larger curvature and a side of the third emission surface having a smaller curvature, with respect to the third axis, is the same across the plurality of the fourth cross sections.
  14. The light source module according to one of claim 1 to claim 13, wherein ultraviolet light exits the optical member.
  15. An ultraviolet light fluid processing device comprising: a flow pipe in which a fluid flows; and the light source module of claim 14, configured to irradiate the ultraviolet light exited from the optical member onto inside of the flow pipe.

Description

BACKGROUND 1. Field of the Invention The present disclosure relates to a light source module and an ultraviolet light fluid processing device. 2. Description of the Related Art There are known lighting devices with multiple light emitting parts. For example, Unexamined Japanese Patent Application Publication No. 2016-170912 discloses a lighting device that includes first light emitting parts composed of multiple first light emitting elements connected in series, and second light emitting parts composed of multiple second light emitting elements connected in series and emitting light in a different color from that of the first light emitting parts, and, in this lighting device, the light distribution angle of emitted light changes according to switching of the color of emitted light by turning on the first light emitting parts and the second light emitting parts selectively. SUMMARY According to an embodiment of the present disclosure, a light source module includes: a substrate having a center region and an outer region located outward of the center region; light sources positioned on an upper surface of the substrate and comprising a plurality of first light emitting parts; and an optical member positioned above the substrate such that the light sources are located between the substrate and the optical member, the optical member comprising light control parts that comprise a plurality of first light control parts. Each of the plurality of first light control parts overlaps with a respective one of the plurality of first light emitting parts in a top view so as to constitute each of a plurality of first stacked bodies positioned in the outer region. In each of the plurality of first stacked bodies, the first light control part comprises: a first incident surface that is planar in shape and that faces a corresponding one of the plurality of first light emitting parts; and a first emission surface that is curved to be convex in a direction away from the first incident surface. In each of the plurality of first stacked bodies, cross sections along a first axis that passes through a center of the first emission surface in the top view and that is perpendicular to the first incident surface include a first cross section in which curvatures of both sides of the first emission surface with respect to the first axis are different from each other. In at least one of the plurality of first stacked bodies, an optical axis of a corresponding one of the plurality of first light control parts is non-parallel to the first axis. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a light source module according to a first embodiment of the present disclosure;FIG. 2 is a partial top view (1) showing an example of the light source module of the first embodiment;FIG. 3 is a partial top view of the light source module shown in FIG. 2 without the optical member;FIG. 4 is a partial top view (2) showing an example of the light source module of the first embodiment;FIG. 5 is a schematic diagram showing an enlarged view of the part labeled "A1" in FIG. 4;FIG. 6 is a schematic diagram showing a cross section of a first stacked body S1, taken along the line VI-VI in FIG. 5;FIG. 7 is a schematic diagram showing a cross section of the first stacked body S1, taken along the line VII-VII in FIG. 5;FIG. 8 is a perspective view showing an example of a first light control part;FIG. 9 is a cross-sectional view (1) showing an example of a second stacked body;FIG. 10 is a cross-sectional view (2) showing examples of second stacked bodies;FIG. 11 is a schematic diagram for explaining the direction in which light is emitted from the light source module of the first embodiment;FIG. 12 is a partial top view showing an example of a light source module according to a first modified example of the first embodiment;FIG. 13 is a schematic diagram showing an enlarged view of the part labeled "A2" in FIG. 12;FIG. 14 is a schematic diagram showing a cross section of a third stacked body S3, taken along the line XIV-XIV in FIG. 13;FIG. 15 is a schematic diagram showing a cross section of the third stacked body S3, taken along the line XV-XV in FIG. 13;FIG. 16 is a schematic diagram for explaining the direction in which light is emitted from the light source module of the first modified example of the first embodiment;FIG. 17 is a partial top view showing an example of a light source module according to a second modified example of the first embodiment;FIG. 18 is a schematic diagram for explaining the direction in which light is emitted from the light source module of the second modified example of the first embodiment;FIG. 19 is a partial top view showing an example of a light source module according to a third modified example of the first embodiment;FIG. 20 is a schematic diagram for explaining the direction in which light is emitted from the light source module of the third modified example of the first embodiment;FIG. 2