Search

EP-4737401-A1 - LIGHT SOURCE MODULE AND ULTRAVIOLET LIGHT FLUID PROCESSING DEVICE

EP4737401A1EP 4737401 A1EP4737401 A1EP 4737401A1EP-4737401-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 arranged between the substrate and the optical member.

Inventors

  • SANO, HIROKI

Assignees

  • NICHIA CORPORATION

Dates

Publication Date
20260506
Application Date
20251027

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 a respective one 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 the first light emitting part; 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, in any cross section 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, both sides of the first emission surface with respect to the first axis have a same curvature, and wherein, in at least one of the plurality of first stacked bodies, an optical axis of the 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, the first axis is separate from a center of a light emitting surface of a corresponding one of the plurality of first light emitting parts in the top view.
  3. The light source module according to claim 2, wherein, in at least one of the plurality of first stacked bodies, the first axis is located closer to the center region than the center of the light emitting surface of the corresponding first light emitting part is to the center region in the top view.
  4. The light source module according to claim 3, wherein, in each of the plurality of first stacked bodies: the optical axis of the first light control part is non-parallel to the first axis; and the first axis is located closer to the center region than is the center of the light emitting surface of the corresponding first light emitting part to the center region in the top view.
  5. The light source module according to claim 4, wherein, in each one of the plurality of first stacked bodies: first axes of all of the plurality of first stacked bodies are positioned on a circumference of a first virtual circle in the top view; and in the top view, the first axis and the center of the light emitting surface of the corresponding first light emitting part are positioned on a first virtual line that passes through a center of the first virtual circle.
  6. The light source module according to claim 5, wherein, in each of the plurality of first stacked bodies, both sides of the first emission surface with respect to the first axis have a same curvature in a cross section including the first virtual line.
  7. The light source module according to one of claim 1 to claim 6, wherein the light sources further comprises 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, 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 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, and wherein, in each of the second stacked bodies, in any cross section along a second axis that passes through a center of the second emission surface in the top view and that is perpendicular to the second incident surface, both sides of the second emission surface with respect to the second axis have a same curvature.
  8. The light source module according to claim 7, 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 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 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, in any cross section taken along 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, both sides of the third emission surface with respect to the third axis have a same curvature, 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.
  9. The light source module according to claim 8, wherein, in at least one of the plurality of third stacked bodies, the third axis is separate from a center of the light emitting surface of the third light emitting part in the top view.
  10. The light source module according to claim 9, wherein, in at least one of the plurality of third stacked bodies, the third axis is located closer to the center region than the center of the light emitting surface of the third light emitting part is to the center region in the top view.
  11. The light source module of claim 10, wherein, in each one of the plurality of third stacked bodies: the optical axis of the third light control part is non-parallel to the third axis; and the third axis is located closer to the center region than the center of the light emitting surface of the corresponding third light emitting part is to the center region in the top view.
  12. The light source module of claim 11, wherein, in each of the plurality of third stacked bodies: third axes of all of the plurality of third stacked bodies are positioned on a circumference of a second virtual circle in the top view; and the third axis and the center of the light emitting surface of the corresponding third light emitting part are positioned, in the top view, on a second virtual line that passes through a center of the second virtual circle.
  13. The light source module according to claim 12, wherein, in each one of the plurality of third stacked bodies, both sides of the third emission surface with respect to the third axis have a same curvature, in a cross section including the second virtual line.
  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 emitted 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 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 including 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 including light control parts that include 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 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 includes: a first incident surface that is planar in shape and that faces the first light emitting part; 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, in any cross section 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, both sides of the first emission surface with respect to the first axis have a same curvature. In at least one of the plurality of first stacked bodies, an optical axis of the first light control part is non-parallel to the first axis. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view showing an example of a light source module according to a first embodiment of the present disclosure;FIG. 1B is a diagram showing a cross section taken along the line IB-IB in FIG. 1A;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 cross-sectional view (1) showing examples of second stacked bodies;FIG. 8 is a cross-sectional view (2) showing examples of second stacked bodies;FIG. 9 is a partial top view (3) showing an example of the light source module of the first embodiment;FIG. 10 is a schematic diagram for explaining the direction in which light is emitted from the light source module of the first embodiment;FIG. 11 is a partial top view (1) showing an example of a light source module according to a first modified example of the first embodiment;FIG. 12 is a schematic diagram showing an enlarged view of the part labeled "A2" in FIG. 11;FIG. 13 is a schematic diagram showing a cross section of a third stacked body S3, taken along the line XIII-XIII in FIG. 12;FIG. 14 is a partial top view (2) showing an example of a light source module according to a first modified example of the first embodiment;FIG. 15 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. 16 is a partial top view showing an example of a light source module according to a second modified example of the first embodiment;FIG. 17 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. 18 is a partial top view showing an example of a light source module according to a third modified example of the first embodiment;FIG. 19 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. 20 is a perspective view showing an example of an optical member for use in a light source module according to a fourth modified example of t