Light source module for sterilization and irradiation device using the same

Abstract

To provide a sterilizing light source module capable of uniformly irradiating UV ray to a planar region and an irradiation device using the same.SOLUTION: According to the present invention, a sterilizing light source module characterized by comprising a light emitting diode for emitting ultraviolet rays, a curved portion arranged on a light emitting side of the light emitting diode, and a cylindrical lens having a flat portion for emitting ultraviolet light emitted from the light emitting diode, in which, in the curved surface portion, a groove portion for receiving ultraviolet rays emitted from the light emitting portion is formed, and, in a bottom portion of the groove portion, in a cross-sectional view of the cylindrical lens, a convex portion curved so as to swell toward the light-emitting portion is formed and an irradiation device using the same are provided.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a sterilization light source module and an irradiation device using the same, and particularly to connecting a light-emitting diode (hereinafter also referred to as "LED") to the curved surface side of a cylindrical lens with a special shape, and making the range of ultraviolet rays radiated in a conical shape into a flat fan shape, so as to be suitable for irradiating a flat area such as an operation panel. The present invention relates to a sterilization light source module and an irradiation device using the same.

Background Art

[0002] Operation panels such as cash dispensers in banks and ticket vending machines in stations, elevator buttons, etc., tables, floors, display boards, etc. are touched by an unspecified number of people. Therefore, there is a risk that viruses and bacteria attached to the operation panel will spread to other users through the operation panel. In particular, due to the increasing public health awareness caused by the spread of the coronavirus infection in recent years, sterilization treatment of the above-mentioned operation panels and tables is strongly desired.

[0003] As a technology for sterilizing an operation panel, for example, as described in JP-A-2006-204824 (Patent Document 1) and JP-A-2011-245305 (Patent Document 2), a sterilization means for an operation panel using ultraviolet rays is known.

[0004] The sterilization means for the operation panel described in Patent Document 1 is to arrange a plurality of ultraviolet lamps using LEDs or the like around the operation panel and irradiate the operation panel with ultraviolet rays radiated from the ultraviolet lamps to sterilize the operation panel.

[0005] However, in the sterilization means of the operation panel described in Patent Document 1, since it is necessary to keep the height (thickness) of the ultraviolet lamp low so as not to interfere with the operation of the operation panel, for example, extremely small-diameter LEDs must be used. In addition, since the ultraviolet rays emitted from the LEDs are diffused in a conical shape, there is a problem that a large number of LEDs must be arranged and used in order to irradiate a flat operation panel, table, etc. uniformly. Furthermore, in the sterilization means described in Patent Document 1, there are also problems such as heat generation problems due to the use of a large number of LEDs and the inability to irradiate the entire surface of the operation panel, table, etc. with ultraviolet rays even when a large number are used (Figure 3 of Patent Document 1).

[0006] The sterilization means of the operation panel described in Patent Document 2 is such that when a user's finger touches the surface of the light guide body that also serves as the operation panel, the evanescent wave of the ultraviolet beam is irradiated onto the finger to sterilize the finger by diffusing (total reflection) the ultraviolet beam emitted from the ultraviolet lamp within the light guide body that also serves as the operation panel.

[0007] However, the sterilization means of the operation panel described in Patent Document 2 has a problem that it cannot be substantially applied (retrofitted) to the operation panels and tables of existing equipment, etc., because an ultraviolet lamp must be installed inside the operation panel and a light guide body that totally reflects the incident ultraviolet beam must be used as the operation panel.

[0008] On the other hand, as a technique for condensing the conically diffused ultraviolet rays emitted from LEDs onto a flat area such as an operation panel or a table, in addition to the method of arranging a large number of LEDs (Patent Document 1) and the method of diffusing ultraviolet rays in a light guide body that also serves as an operation panel by utilizing evanescent waves (Patent Document 2) as described above, for example, as described in Japanese Patent Application Laid-Open No. 2020-3252 (Patent Document 3) and Japanese Patent Application Laid-Open No. 2011-70010 (Patent Document 4), means for condensing ultraviolet rays in a fan shape using a cylindrical lens is known.

[0009] However, the ultraviolet light condensing means described in Patent Document 3 uses a convex lens covering the LED to condense the conically diffused ultraviolet light emitted from the LED into a cylindrical shape, and then further uses a cylindrical lens arranged on the emission side of the LED to spread it in a fan shape. Therefore, there is a problem that the irradiation efficiency is reduced, and the physical space and the structure of the ultraviolet light condensing means in the planar direction become complicated.

[0010] The ultraviolet light condensing means described in Patent Document 4 is to mount an LED on the flat surface side of a cylindrical lens having a curved surface portion and a flat surface portion. However, since the ultraviolet light condensing means described in Patent Document 4 allows the conically radiated ultraviolet light to enter from the flat surface portion of the cylindrical lens, there is a problem that the ultraviolet light that does not intersect the flat surface portion and enters at an angle smaller than 90° is reflected on the surface of the cylindrical lens, reducing the irradiation efficiency.

[0011] Furthermore, since the ultraviolet light condensing means described in Patent Document 4 condenses the conically diffused ultraviolet light into a fan shape through a cylindrical lens, a tapered wing-shaped lens must be provided on the side surface of the cylindrical lens, and there is also a problem that the shape of the lens becomes extremely complicated and large.

Prior Art Documents

Patent Documents

[0012]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0013] Therefore, an object of the present invention is to provide a sterilizing light source module that can irradiate ultraviolet rays uniformly with a minimum number of light-emitting diodes over a flat area such as an operation panel, a table, a floor, a display board, etc. of a cash dispenser of a bank or the like, a ticket vending machine at a station, an elevator button, etc. that can be touched by an unspecified number of people, and an irradiation device using the same, at least achieving a sterilizing effect.

Means for Solving the Problems

[0014] The inventors of the present invention have intensively studied the shape of a lens that can irradiate ultraviolet rays emitted from a light-emitting diode in a conical shape uniformly over a flat area such as an operation panel or a table, at least achieving a sterilizing effect, and the arrangement of a light source module using the lens. As a result, in a cylindrical lens having a curved surface portion and a flat surface portion, a groove portion having a convex lens at the bottom is formed in the curved surface portion, and by connecting the light-emitting diode to the groove portion, it has been found that ultraviolet rays can be irradiated so as to form a fan shape that is wide-angled in the horizontal direction and narrow-angled and flattened in the vertical direction. Furthermore, it has been found that if the above-described light source module is arranged so as to face each other with a flat area such as an operation panel or a table interposed therebetween, ultraviolet rays can be irradiated more uniformly over the flat area, at least achieving a sterilizing effect, and the present invention has been completed.

[0015] That is, according to the present invention, there is provided a sterilizing light source module comprising a light-emitting diode that emits ultraviolet rays, a cylindrical lens having a curved surface portion disposed on the light-emitting portion side of the light-emitting diode, and a flat surface portion that emits ultraviolet rays emitted from the light-emitting diode, wherein a groove portion for receiving ultraviolet rays emitted from the light-emitting portion is formed in the curved surface portion, and a convex portion that curves so as to bulge toward the light-emitting portion is formed at the bottom of the groove portion in a cross-sectional view of the cylindrical lens.

[0016] Generally, in order to condense the ultraviolet rays radiated conically from a light-emitting diode into a flattened fan shape using a cylindrical lens having a curved surface portion and a flat surface portion, as shown in Patent Documents 3 and 4, the ultraviolet rays are made to enter the flat surface portion of the cylindrical lens. This is because when the ultraviolet rays are made to enter the curved surface portion of the cylindrical lens, more ultraviolet rays enter at an angle smaller than 90° and not perpendicular to the incident surface compared to when they enter the flat surface portion. As a result, more ultraviolet rays are reflected on the surface of the cylindrical lens and the irradiation efficiency decreases.

[0017] However, if all the ultraviolet rays emitted from the light-emitting diode can be made to enter the cylindrical lens from the curved surface portion side, the ultraviolet rays that enter the cylindrical lens are rather internally reflected at the curved surface portion and efficiently condensed onto the flat surface portion which is the exit surface. Therefore, it is considered that the irradiation efficiency of the ultraviolet rays emitted from the flat surface portion is improved, and it can be condensed into a flattened fan shape. For this reason, in the present invention, a groove portion having a convex lens (a convex portion curved so as to bulge toward the light-emitting diode) at the bottom is provided in the curved surface portion of the cylindrical lens, and a lens having a shape in which the cylindrical lens and a total reflection mirror are combined is used, so that the distance between the light-emitting diode and the lens is reduced, and substantially all the ultraviolet rays radiated conically from the light-emitting diode can be guided into the cylindrical lens.

[0018] As a result, the sterilization light source module of the present invention can irradiate the ultraviolet rays so as to form a flattened fan shape with a horizontal spread angle of 90° or more and 150° or less and a vertical spread angle of 5° or more and 20° or less at a high irradiation efficiency. Therefore, the sterilization light source module of the present invention can be tilted downward so that the incident angle of the optical axis at its center is preferably 0° or more and 15° or less, more preferably 2.5° or more and 10° or less, with respect to a flat area such as an operation panel or a table, so that the flat area can be uniformly irradiated in terms of achieving a sterilization effect evenly.

[0019] In the present invention, the convex portion provided at the bottom of the groove portion allows the horizontal component of the ultraviolet rays radiated conically from the light-emitting diode to travel straight inside the cylindrical lens while maintaining substantially its radiation angle (horizontal spread angle), and for the vertical component of the ultraviolet rays, it is refracted in a direction substantially orthogonal to the flat portion of the cylindrical lens and travels straight inside the cylindrical lens. Further, the ultraviolet rays that do not reach the convex portion are taken into the cylindrical lens from the upper and lower side surfaces of the groove portion while maintaining substantially their radiation angle (spread angle) for both the horizontal component and the vertical component, and only the vertical component is refracted in a direction substantially orthogonal to the flat portion by being reflected by the curved surface portion of the cylindrical lens and travels straight inside the cylindrical lens.

[0020] Thus, the groove portion and the convex portion also function to prevent unnecessary refraction and reflection of the ultraviolet rays and improve the incident efficiency of the ultraviolet rays radiated from the light-emitting diode to the cylindrical lens. Therefore, it is preferable that the convex portion in the groove portion is composed of a curved surface having a single curvature or curved surfaces having a plurality of different curvatures in a cross-sectional view of the cylindrical lens. Further, the shape of the convex portion can be determined based on the thickness and material (refractive index) of the cylindrical lens, the distance between the light-emitting surface of the light-emitting diode and the convex portion, and the like.

[0021] Furthermore, it is preferable that the groove portion and the convex portion are configured such that the cross sections of the groove portion and the convex portion have the same shape over the entire longitudinal length of the cylindrical lens. By forming the cross sections of the groove portion and the convex portion to have the same shape over the entire longitudinal length of the cylindrical lens, in any cross section of the cylindrical lens, the horizontal spread of the ultraviolet rays radiated conically from the light-emitting diode can be maintained or expanded, and only the vertical spread can be uniformly suppressed. As a result, the ultraviolet rays radiated from the light-emitting diode are irradiated so as to form a flattened fan shape with extremely uniform illuminance from the viewpoint of achieving a sterilization effect when passing through the cylindrical lens. Note that when the component of the ultraviolet rays radiated from the light-emitting diode that spreads in the horizontal direction (the longitudinal direction of the cylindrical lens) is extremely small, it is not necessary to provide the groove portion and the convex portion over the entire longitudinal length of the cylindrical lens.

[0022] In the present invention, the curved surface portion of the cylindrical lens is configured to efficiently reflect the ultraviolet rays incident from the groove portion into the cylindrical lens to the flat surface portion by internal reflection and then emit them fan-shaped with a desired spread. Therefore, in a cross-sectional view of the cylindrical lens, it can be configured to have a single curvature or a plurality of different curvatures excluding the groove portion. Further, the shape of the curved surface portion can be determined based on the thickness and material (refractive index) of the cylindrical lens, the optical path of the ultraviolet rays incident from the groove portion, and the like.

[0023] The material of the cylindrical lens is not particularly limited as long as it is an ultraviolet-transmitting material indicating a refractive index, and an inorganic material such as glass or an organic material such as resin can be used. More specifically, the material of the cylindrical lens is selected from glass, borosilicate glass, fused quartz, synthetic quartz, sapphire, and ultraviolet-transmitting resins such as acrylic resin and fluororesin.

[0024] According to the present invention, there are provided a plurality of sterilizing light source modules for irradiating ultraviolet rays onto the above-described planar region, and at least one pair of the sterilizing light source modules are arranged to face each other across the planar region in a plan view, and the optical axis of the sterilizing light source module is arranged downward within a range of 0° or more and 15° or less with respect to the surface of the planar region. Here, the planar region means a planar area of a tangible object that can be touched by the hands of an unspecified number of people, such as the surface of an operation panel, a table, a floor, or a display board for performing an input operation.

[0025] The sterilizing light source module of the present invention can irradiate ultraviolet rays so as to form a flattened fan shape with a horizontal spread angle of 90° or more and 150° or less and a vertical spread angle of 5° or more and 20° or less. Therefore, in the ultraviolet irradiation device of the present invention, the sterilizing light source module is preferably tilted downward so that the incident angle of the optical axis at its center is 0° or more and 15° or less, more preferably 2.5° or more and 10° or less, with respect to a planar region such as an operation panel or a table, and further, at least one pair of sterilizing light source modules are arranged to face each other across the planar region, so that the planar region can be uniformly irradiated in terms of achieving a sterilization effect evenly.

[0026] The ultraviolet irradiation device of the present invention has a feature that it can be retrofitted to a planar region such as an operation panel or a table of existing equipment. Therefore, the ultraviolet irradiation device of the present invention preferably includes a frame body arranged at the peripheral edge of the planar region to which ultraviolet rays are irradiated, and a plurality of sterilizing light source modules used in the ultraviolet irradiation device are attached to the frame body.

[0027] By integrally attaching a plurality of sterilizing light source modules to a single frame, not only is it extremely easy to attach them to a flat area such as an operation panel or table of existing equipment, but also the aesthetics of the ultraviolet irradiation device are improved, which is also useful for protecting the sterilizing light source modules. Further, by providing a reflector on the frame for reflecting the ultraviolet rays emitted from the sterilizing light source module toward the flat area, the ultraviolet rays emitted from the sterilizing light source module can be reflected to the flat area without waste, improving the irradiation efficiency of the ultraviolet irradiation device and also improving the sterilizing power by ultraviolet rays.

[0028] Note that the frame is not particularly limited in its shape or material as long as it can be arranged at the peripheral edge of the flat area to be irradiated with ultraviolet rays. Generally, an angle or channel made of resin, metal, etc. is preferably used.

Advantages of the Invention

[0029] According to the sterilizing light source module of the present invention, by providing a groove portion having a convex lens at the bottom on the curved surface portion of the cylindrical lens, substantially all of the ultraviolet rays radiated conically from the light-emitting diode can be guided into the cylindrical lens. As a result, at a high irradiation efficiency, the ultraviolet rays can be irradiated so as to form a flattened fan shape with a horizontal spread angle of 90° or more and 150° or less and a vertical spread angle of 5° or more and 20° or less.

[0030] According to the ultraviolet irradiation device of the present invention, by arranging the sterilizing light source modules so as to face each other with a flat area such as an operation panel or table in between, and arranging them downward so that the optical axis of the sterilizing light source module forms a predetermined incident angle with respect to the surface of the flat area, the flat area can be uniformly irradiated with ultraviolet rays in a sense of achieving a sterilization effect evenly with a very small number of light-emitting diodes.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0032] Hereinafter, a sterilization light source module according to an embodiment of the present invention and an irradiation device using the same will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of the present invention.

Examples

[0033] Fig. 1 shows a perspective view of the light source module 1 according to the present embodiment, Fig. 2 shows a plan view of the light source module 1 of the present embodiment, and Fig. 3 shows a cross-sectional view obtained by cutting the light source module 1 shown in Fig. 2 along the A-A section. In Figs. 1 to 3, for better understanding of the structure of the light source module 1, the cover 11, heat dissipation fins 12, etc. covering the light source module 1 are shown omitted by dotted lines.

[0034] As can be well understood with reference to FIGS. 1 to 3, the light source module 1 of the present embodiment includes a light-emitting diode 2 that emits ultraviolet light 3, and a cylindrical lens 4 for spreading and emitting the ultraviolet light 3 emitted from the light-emitting diode 2 in a flat fan shape. The cylindrical lens 4 has a shape like a fishing float obtained by cutting a cylinder or an elliptical cylinder in the axial direction, and is a lens composed of a curved surface with curvature on one side and a flat surface without curvature on the other side.

[0035] The cylindrical lens 4 used in the present embodiment includes a curved surface portion 40 into which the ultraviolet light 3 emitted from the light-emitting diode 2 is incident, and a flat surface portion 41 from which the ultraviolet light 3 incident on the curved surface portion 40 is emitted. The curved surface portion 40 is arranged to abut against the light-emitting portion 20 of the light-emitting diode 2. Further, a groove portion 42 for receiving the ultraviolet light 3 emitted from the light-emitting diode 2 is formed in the curved surface portion 40 of the cylindrical lens 4, and a convex portion 43 that curves so as to bulge toward the light-emitting portion 20 is formed at the bottom of the groove portion 42 in a cross-sectional view of the cylindrical lens 4 (FIG. 3).

[0036] Therefore, in the present embodiment, the ultraviolet light 3 radiated in a conical shape from the light-emitting diode 2 is guided entirely into the cylindrical lens 4 without leaking to the outside. Further, the ultraviolet light 3 guided into the cylindrical lens 4 is internally reflected at the curved surface portion 40 and efficiently reflected to the flat surface portion 41, so that the irradiation efficiency of the ultraviolet light 3 emitted from the flat surface portion 41 is improved.

[0037] In the present embodiment, the convex portion 43 provided at the bottom of the groove portion 42 allows the horizontal component of the ultraviolet light 3 radiated in a conical shape from the light-emitting diode 2 to travel straight inside the cylindrical lens 4 while maintaining substantially its radiation angle (horizontal spread angle) (FIG. 2). For the vertical component of the ultraviolet light 3, it is refracted in a direction substantially perpendicular to the flat surface portion 41 of the cylindrical lens 4 and travels straight inside the cylindrical lens (FIG. 3).

[0038] In addition, the ultraviolet rays 3 that do not reach the convex portion 43 are taken into the cylindrical lens 4 from the upper and lower side surfaces 44 of the groove portion 42 so as to maintain substantially the radiation angle (spread angle) both in the horizontal component and in the vertical component, and only the vertical component is reflected by the curved surface portion 40 of the cylindrical lens 4 and refracted in a direction substantially orthogonal to the flat surface portion 41 and travels straight through the cylindrical lens 4 (FIG. 3).

[0039] As a result, the sterilizing light source module 1 of the present embodiment can irradiate the ultraviolet rays 3 so as to form a flattened fan shape with a horizontal spread angle α of 90° or more and 150° or less (FIG. 2) and a vertical spread angle β of 5° or more and 20° or less (FIG. 3) with high irradiation efficiency. In this way, the groove portion 42 and the convex portion 43 also function to prevent useless refraction and reflection of the ultraviolet rays 3 on the surface of the cylindrical lens 4 and improve the incident efficiency of the ultraviolet rays 3 radiated from the light-emitting diode 2 to the cylindrical lens 4.

[0040] In the present embodiment, the convex portion 43 in the groove portion 42 is composed of a curved surface having a single curvature in a cross-sectional view of the cylindrical lens 4, but it can also be composed of curved surfaces having a plurality of different curvatures. The shape of the convex portion 43 is determined based on the thickness and material (refractive index) of the cylindrical lens 4, the distance between the light-emitting portion 20 of the light-emitting diode 2 and the convex portion 43, and the like.

[0041] In addition, the groove portion 42 and the convex portion 43 are configured such that the cross-sections of the groove portion 42 and the convex portion 43 are the same shape over the entire length of the cylindrical lens 4 in the longitudinal direction. However, when the component that spreads in the horizontal direction (the longitudinal direction of the cylindrical lens 4) among the ultraviolet rays 3 radiated from the light-emitting diode 2 is extremely small, it is not necessary to provide them over the entire length of the cylindrical lens 4 in the longitudinal direction.

[0042] In this embodiment, by forming the cross-sections of the groove portion 42 and the convex portion 43 to have the same shape over the entire length of the cylindrical lens 4 in the longitudinal direction, the vertical component of the ultraviolet rays 3 radiated conically from the light-emitting diode 2 can be taken into the cylindrical lens 4 at the same incident angle at any cross-section of the cylindrical lens 4. As a result, while maintaining or expanding the horizontal spread of the ultraviolet rays 3 (FIG. 2), only the vertical spread can be uniformly suppressed (FIG. 3). As a result, the ultraviolet rays 3 radiated from the light-emitting diode 2 are irradiated so as to form a flattened fan shape at a very uniform illuminance from the viewpoint of achieving a sterilization effect by passing through the cylindrical lens 4.

[0043] In this embodiment, the curved surface portion 40 of the cylindrical lens 4 is configured to efficiently reflect the ultraviolet rays 3 incident from the groove portion 42 into the cylindrical lens 4 to the flat surface portion 41 by internal reflection, and then emit them fan-shaped with a desired spread from the flat surface portion 41. Therefore, in a cross-sectional view of the cylindrical lens 4, it is configured to have a single curvature except for the groove portion 42, but it can also be configured to have a plurality of different curvatures. Further, the shape of the curved surface portion 40 can be determined based on the thickness and material (refractive index) of the cylindrical lens 4, the optical path of the ultraviolet rays 3 incident from the groove portion 42, and the like.

[0044] The material of the cylindrical lens 4 is not particularly limited as long as it is an ultraviolet ray transmitting material indicating a refractive index, and an inorganic material such as glass or an organic material such as resin can be used. More specifically, the material of the cylindrical lens 4 is selected from glass, borosilicate glass, fused quartz, synthetic quartz, sapphire, and ultraviolet ray transmitting resins such as acrylic resin and fluororesin.

[0045] FIG. 4 shows a perspective view of the ultraviolet ray irradiation device 5 according to this embodiment in which the light source module 1 is disposed in the planar region 6 for irradiating the ultraviolet rays 3.

[0046] As can be understood with reference to FIG. 4, the ultraviolet irradiation device 5 of the present embodiment includes four sterilizing light source modules 1 of the present invention suitable for irradiating ultraviolet rays 3 onto a planar region 6, and two pairs of the light source modules 1 among them are arranged to face each other across the planar region 6 in a plan view. Although not shown, in the present embodiment, it is sufficient that at least one pair of the light source modules 1 among two or more light source modules 1 are arranged to face each other across the planar region 6. Therefore, the total number of the light source modules 1 may be an even number such as 2, 4, 6,... or an odd number such as 3, 5, 7,....

[0047] Further, in the ultraviolet irradiation device 5 of the present embodiment, the optical axis 10 of each light source module 1 is arranged downward within a range of 0° or more and 15° or less with respect to the surface of the planar region 6 irradiated by the optical axis 10.

[0048] As described above, the sterilizing light source module 1 of the present invention can irradiate the ultraviolet rays 3 so as to form a flattened fan shape in which the horizontal spread angle α is 90° or more and 150° or less and the vertical spread angle β is 5° or more and 20° or less. For this reason, in the ultraviolet irradiation device 5 of the present embodiment, two pairs of the light source modules 1 are arranged to face each other across the planar region 6, and further, the central optical axis 10 of the light source module 1 is preferably inclined downward so as to have an incident angle of 0° or more and 15° or less, more preferably 2.5° or more and 10° or less, with respect to the planar region 6 such as an operation panel or a table. As a result, substantially all of the horizontal components of the ultraviolet rays 3 spreading particularly in a fan shape can be directed to the planar region 6 without loss, and it becomes possible to irradiate the planar region 6 uniformly in terms of achieving a sterilization effect.

[0049] Further, since the sterilizing light source module 1 and the ultraviolet irradiation device 5 of the present embodiment are extremely thin and compact, they can be retrofitted even in a planar region 6 such as an operation panel or a table of existing equipment. For this reason, the ultraviolet irradiation device 5 of the present embodiment includes a frame body 7 arranged at the peripheral portion of the planar region 6 irradiated with the ultraviolet rays 3, and each light source module 1 is attached to the frame body 7 (FIG. 4).

[0050] By integrally attaching each light source module 1 to a single frame body 7, the attachment to a flat area 6 such as an operation panel or a table of existing equipment can be completed with just one attachment operation, which not only becomes extremely easy, but also improves the aesthetics of the ultraviolet irradiation device 5 and helps protect the light source module 1. Also, although not shown, the frame body 7 may be provided with a reflector for reflecting the ultraviolet rays 3 emitted from each light source module 1 toward the flat area 6 between the light source modules 1. In this case, the ultraviolet rays 3 emitted from the light source module 1 can be reflected toward the flat area 6 without waste, improving the irradiation efficiency of the ultraviolet irradiation device 5 and further enhancing the sterilizing power of the ultraviolet rays 3.

[0051] Note that the frame body 7 is not particularly limited in terms of its shape or material as long as it can be arranged at the peripheral edge of the flat area 6 to be irradiated with the ultraviolet rays 3, but generally, an angle or channel made of resin, metal, etc. is preferably used.

[0052] Fig. 5 shows an overview of the simulation conditions (such as the arrangement of the light source modules 1) when irradiating the flat area 6 with the ultraviolet rays 3 using the ultraviolet irradiation device 5 according to this embodiment, and Fig. 6 shows the simulated illuminance distribution in the flat area 6 when irradiating with the ultraviolet rays 3 using the ultraviolet irradiation device 5 of this embodiment, as well as the illuminance distribution in the horizontal direction W and the vertical direction L of the flat area 6.

[0053] [Simulation Conditions] 1. Specifications of the light source module 1: DeepUV-LED (265 nm) (1) Horizontal spread angle α: 90° (2) Vertical spread angle β: 15° 2. Arrangement of the light source module 1 (1) Horizontally: Four (2 pairs) light source modules 1 are arranged at the four corners of the flat area 6 such that the central optical axis 10 is aligned on the diagonal line of the flat area 6. (2) Vertically: Each light source module 1 is arranged such that the central optical axis 10 has an incident angle of 3° downward with respect to the flat area 6. 3. Size of the planar region 6: 12.1 inches (250 mm in width × 190 mm in length) 4. Irradiation conditions of the light source module 1: The irradiation intensity of each light source module 1 was adjusted evenly so that the illuminance at the center P of the planar region 6 was 46 μW / cm 2 5. Simulation software: Zemax Optic studio

[0054] From the illuminance distribution shown in Fig. 6, it was found that according to the sterilization light source module 1 of the present embodiment and the ultraviolet irradiation device 5 using the same, the ultraviolet rays 3 controlled in a fan shape by the cylindrical lens 4 uniformly irradiate the planar region 6 without omission and achieve a sterilization effect. Further, from the illuminance distribution in the horizontal direction W and the vertical direction L of the planar region 6, it was found that the ultraviolet irradiation device 5 of the present embodiment can also suppress the illuminance difference between the illuminance near the edge of the planar region 6 close to the light source module 1 and the illuminance at the center of the planar region 6 far from the light source module 1 to within about 20%.

Explanation of symbols

[0055] 1 ··· Light source module 10 ··· Optical axis 11 ··· Cover 12 ··· Heat dissipation fins 2 ··· Light emitting diode 20 ··· Light emitting part 3 ··· Ultraviolet rays 4 ··· Cylindrical lens 40 ··· Curved surface part 41 ··· Planar part 42 ··· Groove part 43 ··· Convex part 44 ··· Side surface part 5 ··· Irradiation device 6 ··· Planar region 7 ··· Frame body α ··· Horizontal spread angle of ultraviolet rays β ··· Vertical spread angle of ultraviolet rays W ··· Horizontal simulated cross section of the planar region ​Vertical simulated cross-section of the L···· planar region

Claims

1. A light-emitting diode that emits ultraviolet light, a cylindrical lens having a curved surface portion disposed on the light-emitting portion side of the light-emitting diode, a flat surface portion that emits the ultraviolet light emitted from the light-emitting diode, and extending linearly in the longitudinal direction, and a groove portion for receiving the ultraviolet light emitted from the light-emitting portion is formed in the curved surface portion so as to extend linearly in the longitudinal direction, a convex portion that curves so as to bulge toward the light-emitting portion and extends linearly in the longitudinal direction is formed at the bottom of the groove portion in a cross-sectional view of the cylindrical lens, and A sterilizing light source module characterized in that the horizontal spread angle of ultraviolet light is 90° or more and 150° or less, and the vertical spread angle of ultraviolet light is 5° or more and 20° or less.

2. The sterilizing light source module according to claim 1, wherein the convex portion is composed of a curved surface having a single curvature or curved surfaces having a plurality of different curvatures in a cross-sectional view of the cylindrical lens.

3. The sterilizing light source module according to claim 1 or 2, wherein the groove portion and the convex portion are formed such that the cross-sections of the groove portion and the convex portion are the same shape over the entire length of the cylindrical lens in the longitudinal direction.

4. The sterilizing light source module according to any one of claims 1 to 3, wherein the curved surface portion has a single curvature or a plurality of different curvatures excluding the groove portion in a cross-sectional view of the cylindrical lens.

5. The sterilizing light source module according to any one of claims 1 to 4, wherein the cylindrical lens is made of at least one material selected from the group consisting of glass, borosilicate glass, fused quartz, synthetic quartz, sapphire, acrylic resin, and fluororesin.

6. Comprising a plurality of sterilizing light source modules according to any one of claims 1 to 5 for irradiating ultraviolet light onto a flat surface area, and An ultraviolet irradiation device, wherein at least one pair of the plurality of sterilizing light source modules are arranged to face each other across the flat surface area in a plan view, and the optical axis of the sterilizing light source module is arranged downward within a range of 0° or more and 15° or less with respect to the surface of the flat surface area.

7. The ultraviolet irradiation device according to claim 6, wherein the flat surface area is the surface of an operation panel, a table, a floor, or a display board for performing an input operation.

8. It includes a frame disposed at the peripheral edge of the flat area, and The ultraviolet irradiation device according to claim 6 or 7, wherein the sterilization light source modules are respectively attached to the frame.

9. The ultraviolet irradiation device according to claim 8, wherein the frame includes a reflector that reflects the ultraviolet rays emitted from the sterilization light source module toward the flat area.

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