Air sterilization device

Abstract

To provide an air sterilizer reduced in weight and size while securing sterilization performance by improving utilization efficiency of light to a range of irradiation target.SOLUTION: An air sterilizer 1 includes: a reflecting mirror 30 that is disposed in a housing 10 with its opening facing the front of the housing 10; a light emitting element 21 disposed at a focal point f of the reflecting mirror 30 and emitting light including ultraviolet rays; and a light-shielding plate 23 which is disposed below the reflecting mirror 30 and blocks at least downwardly directing light of the above-mentioned light. The light of the light-emitting element 21 is reflected by the reflecting mirror 30, and the light is radiated from an irradiation window 1A in front of the housing 10. The light shielding plate 23 is arranged with a predetermined offset amount α on an irradiation part 35 side with respect to the light emitting element 21 and protrudes with a predetermined protrusion amount β with respect to the light emitting element 21, so as to block and absorb the light directly incident from the light-emitting element 21 and the light from the light emitting element 21 incident from the reflecting mirror 30.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an air sterilization device.

Background Art

[0002] Conventionally, in public facilities such as hospital waiting rooms, schools, government offices, libraries, and spaces such as offices, the need to sterilize (inactivate) mold and viruses as a measure against infectious diseases has been increasing. As a means of sterilizing a space, a sterilization device that uses an ultraviolet lamp and is installed in the upper layer of a room has been developed (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when a configuration using an ultraviolet lamp is adopted, there are problems that it is difficult to miniaturize the device and the utilization efficiency (irradiation efficiency) of light (ultraviolet rays) from the lamp is low. For example, in Patent Document 1, since the light of the ultraviolet lamp passes between plate-shaped diaphragm members that extend in the front direction of the device, the utilization efficiency of the light becomes low. Therefore, the present disclosure has been made in view of the above circumstances, and aims to improve the utilization efficiency of light in the irradiation target range, ensure sterilization performance, and reduce weight and size.

Means for Solving the Problems

[0005] One embodiment for solving the above problem is an air sterilization device comprising: a reflector positioned in a housing with an opening facing the front of the housing; a light-emitting element positioned at the focal point of the aspherical reflective surface of the reflector and emitting light including ultraviolet light; and a light-shielding plate positioned below the reflector and blocking at least the downward-facing light of the light, wherein the light of the light-emitting element is reflected by the reflector and the light is irradiated from an irradiation window in front of the housing, and the light-shielding plate is positioned with a predetermined offset amount relative to the light-emitting element on the irradiation part side corresponding to the opening of the reflector, and protrudes with a predetermined amount relative to the light-emitting element, blocking and absorbing the light that directly incident from the light-emitting element and the light of the light-emitting element that incident from the reflector.

[0006] In another embodiment, the air sterilization device described above comprises a reflector having an aspherical reflective surface that defines the upper position of the opening and a pair of side plates that define the left and right positions of the opening, the pair of side plates being mounted on a base, the light-shielding plate being mounted on the upper surface of the base, and the irradiation portion of the reflector corresponding to the opening being formed in a substantially rectangular shape.

[0007] In another embodiment, the light distribution of the light is controlled by the offset amount and the protrusion amount to a target angle θB that is at least an angle θA upward with respect to the horizontal direction, with respect to the housing.

[0008] In another embodiment, the air sterilization device is configured such that the housing is made of metal, and the substrate of the light-emitting element is mounted to the bottom plate of the housing in a manner that allows heat to be conducted.

[0009] In another embodiment, the thickness of the bottom plate of the housing of the air sterilization device is 5 mm or more and 10 mm or less.

[0010] In another embodiment, the air sterilization device has a plurality of light-emitting elements, which are arranged at equal intervals in a horizontal row parallel to the opening of the reflector.

[0011] In another embodiment, the peak wavelength of the light-emitting element in the air sterilization device is in the range of 260 to 280 nm.

[0012] In another embodiment, the air sterilization device is equipped with a motion sensor that detects people in the area in front of the housing, and when a person is detected by the motion sensor, the illumination of the light-emitting element is prohibited. [Effects of the Invention]

[0013] According to this disclosure, it is possible to provide a lightweight and compact air sterilization device that improves the efficiency of light utilization in the irradiation target area and ensures sterilization performance. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of an air sterilization device according to an embodiment of the present invention. [Figure 2] This is a disassembled perspective view of an air sterilization device. [Figure 3] This is a top view of the circuit board. [Figure 4] This figure shows the relationship between the thickness D of the base plate and the cooling effect of the light-emitting element. [Figure 5] This diagram shows the reflecting mirror along with its surrounding components from the side. [Figure 6] Figure 6A shows the reflector along with its surrounding components from above, and Figure 6B shows the reflector along with its surrounding components from the front. [Figure 7] Figure 7A shows the air sterilization device supported by a wall-mount bracket, and Figure 7B shows the air sterilization device supported by a ceiling-mount bracket. [Figure 8] This is a diagram illustrating the AR (Armor Relief) target area. [Figure 9] Figure 9A shows an example of the placement of an air sterilization device in a large room, and Figure 9B shows an example of the placement of an air sterilization device in a room with a narrow width relative to its depth. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0016] [Embodiment] FIG. 1 is a perspective view of an air sterilization device 1 according to an embodiment of the present invention. The air sterilization device 1 includes a box-shaped housing 10. A front frame 11 is provided in front of the housing 10. An irradiation window 1A, an indicator lamp 1B, and two human presence sensors 1C are provided on the front frame 11. The irradiation window 1A is a window for irradiating ultraviolet rays. This irradiation window 1A is covered with a front glass 12 to prevent dust from entering the interior.

[0017] The indicator lamp 1B is an information display unit that indicates the operating state of the air sterilization device 1. In the present embodiment, under the control of a control board 17 described later, the indicator lamp 1B lights up when ultraviolet rays are being irradiated, and goes out when ultraviolet rays are not being irradiated. The human presence sensors 1C are arranged on the left and right of the irradiation window 1A and detect people around the front of the housing 10. Thereby, the human presence sensors 1C can detect whether or not there are people around the front of the air sterilization device 1. When a person is detected by the human presence sensors 1C, the irradiation of ultraviolet rays is prohibited under the control of the control board 17. By this control, the situation where ultraviolet rays are irradiated when there are people in the irradiation range of the ultraviolet rays is avoided.

[0018] FIG. 2 is an exploded perspective view of the air sterilization device 1. As shown in FIG. 2, the housing 10 is formed by vertically overlapping an upper housing 13 having a substantially inverted U-shaped cross section and a lower housing 14 having a substantially U-shaped cross section, attaching a back plate 15 to the back, and attaching a front frame 11 to the front. A front glass 12, an indicator lamp 1B, and human presence sensors 1C are attached to the front frame 11. Reference numeral 16 in FIG. 2 is a connecting plate that connects the back plate 15 and the front frame 11. Only the connecting plate 16 on one side (left or right) is shown in FIG. 2, and the illustration of the connecting plate 16 on the other side is omitted. Inside the housing 10, in addition to optical system components, a control board 17, a power supply 18, a terminal block 19, a substrate 20, etc. are arranged. The housing 10 and the front frame 11 of the present embodiment are made of metal and have high thermal conductivity compared to resin materials and the like.

[0019] A circuit board 20 is mounted on the upper surface of the bottom plate 14A of the lower housing 14. A light-emitting element 21, which constitutes the light source of the air sterilization device 1, is placed on the circuit board 20. A concave notch 22K is formed in the metal plate base 22. The base 22 is positioned and placed by abutting the notch 22K against the circuit board 20. A metal reflector 30 and a light-shielding plate 23 are mounted on the upper surface 22A of the base 22. The base 22 is also called a base plate and is a highly thermally conductive material.

[0020] The reflector 30 reflects the light from the light-emitting element 21 toward the front of the air sterilization device 1 and emits it toward the irradiation window 1A. The light-shielding plate 23 is a metal plate-like member attached to the upper surface 22A of the base 22, below the reflector 30, and extending forward of the housing 10. The surfaces of the light-shielding plate 23 and the base 22 are treated with a surface treatment (for example, black paint) that absorbs light from the light-emitting element 21.

[0021] Figure 3 is a top view of the substrate 20. As shown in Figure 3, multiple (three in this configuration) light-emitting elements 21 are mounted on the substrate 20 at intervals in the left-right direction of the housing 10. Each light-emitting element 21 is arranged in a horizontal row at equal intervals and emits light upward from the top surface 20A of the substrate 20. The surface of the substrate 20 is treated with a light-absorbing surface treatment (for example, black paint).

[0022] Each light-emitting element 21 is an LED that emits light including ultraviolet light, with a peak wavelength in the range of 260 nm to 280 nm. In this configuration, the LED has a peak wavelength of 265 nm. The number of each light-emitting element 21 can be appropriately changed according to the specifications of the air sterilization device 1. In addition, a lens may be provided to control the light distribution of each light-emitting element 21.

[0023] A pair of terminals 20T are supplied with drive power to drive each light-emitting element 21. The drive power is supplied to each light-emitting element 21 via the terminals 20T. The lower surface 20B of the substrate 20 is in surface contact with the bottom plate 14A of the lower housing 14 via thermal conductive grease. The thermal conductive grease promotes heat conduction from the substrate 20 to the lower housing 14.

[0024] In this embodiment, the upper housing 13 and the lower housing 14 are made of aluminum alloy or pure aluminum, and the thickness D of the bottom plate 14A to which the circuit board 20 is attached (corresponding to the thickness of the lower housing 14) is set to 5 mm or more. Figure 4 shows the relationship between the thickness D of the bottom plate 14A and the cooling effect of the light-emitting element 21. Table 1 shows the values ​​corresponding to Figure 4. These are the results of a simulation performed with the ambient temperature set to 35°C. Figure 4 and Table 1 also show the surface temperatures of each housing 13 and 14. Note that the thickness of the upper housing 13 (corresponding to the thickness of the top plate of housing 10) is the same as the thickness D of the bottom plate 14A.

[0025] [Table 1]

[0026] The junction temperature of the light-emitting element 21 is ideally 80°C or lower according to the design specifications. As shown in Figure 4 and Table 1, by making the upper housing 13 and the lower housing 14 from aluminum alloy or pure aluminum, and setting the thickness D of the bottom plate 14A to 5 mm or more, the temperature of the light-emitting element 21 can be kept below 80°C. In other words, sufficient cooling effect for the light-emitting element 21 can be obtained. Bottom plate 14 A The thickness D should preferably be 10 mm or less. By making the thickness D 10 mm or less, the height of the air sterilization device 1 can be reduced, the air sterilization device 1 can be made lighter, and the base plate 14 can be made from a metal plate. A This offers advantages such as making the processing of the material easier.

[0027] Figure 5 shows the reflector 30 along with its surrounding components from the side. Figure 6A shows the reflector 30 along with its surrounding components from above, and Figure 6B shows the reflector 30 along with its surrounding components from the front. For ease of explanation, the housing 10 is schematically shown in Figure 5 with a dashed line. The reflector 30 comprises an aspherical reflective surface 32M and a pair of side plate portions 31 integrally provided on the aspherical reflective surface 32M. The aspherical reflective surface 32M is the reflective surface facing the light-emitting element 21 and defines the upper position of the opening of the reflector 30. The pair of side plate portions 31 are located to the left and right of the aspherical reflective surface 32M and define the left and right positions of the opening of the reflector 30. The aspherical reflective surface 32M extends between the pair of side plate portions 31 from the back portion 31A to the upper portion 31B of the side plate portion 31. The pair of side plate portions 31 are attached to the base 22, and a light-shielding plate 23 is attached to the upper surface 22A of the base 22 between the pair of side plate portions 31. The illumination section 35, which corresponds to the opening of the reflector 30, is formed in a substantially rectangular shape by the light-shielding plate 23 and the reflector 30. The illumination section 35 is an opening connected to the illumination window 1A of the front frame 11, and the illumination section 35 and the illumination window 1A are identical in shape.

[0028] The aspherical reflective surface 32M faces the multiple light-emitting elements 21 and functions as a first reflective surface that reflects light from each light-emitting element 21 toward the front of the housing 10. The aspherical reflective surface 32M has an aspherical cross-section in the vertical cross-sectional view of the housing 10 (corresponding to the vertical cross-sectional view extending in the front-to-back direction of the housing 10), and has the same cross-sectional shape in the left-to-right direction of the housing 10. This aspherical reflective surface 32M allows control of the light distribution of the housing 10, mainly in the vertical direction.

[0029] Multiple light-emitting elements 21 are arranged horizontally parallel to the irradiation section 35. column They are arranged at equal intervals and are located at the focal point f of the aspherical reflective surface 32M. Since the light-emitting element 21 is located at the focal point f of the aspherical reflective surface 32M, light from the light-emitting element 21 can be reflected effectively. Moreover, compared to the case where the light-emitting element 21 is located at the focal point of the spherical reflective surface, it becomes easier to appropriately control the light distribution.

[0030] The aspherical reflective surface 32M of this embodiment has a long-focus elliptical shape. More specifically, this long-focus elliptical shape is an ellipse having a major axis extending in the front-rear direction of the housing 10, and the secondary focal point where the reflected light is focused is set at a position away from the front of the housing 10. By setting the secondary focal point to match the pre-set irradiation target area AR, it becomes easier to illuminate the irradiation target area AR.

[0031] This document describes the structure related to the installation of the air sterilization device 1 and an example of the irradiation target range (AR). Figure 7A shows the air sterilization device 1 supported by a wall-mounted bracket 2, and Figure 7B shows the air sterilization device 1 supported by a ceiling-mounted bracket 5. The wall-mounted bracket 2 comprises a support part 3 on which the air sterilization device 1 is placed, and a mounting part 4 for attachment to the upper wall of the room to be sterilized. The ceiling-mounted bracket 5 is a rectangular, annular frame member and comprises a support part 6 on which the air sterilization device 1 is placed, and a mounting part 7 for attachment to the ceiling of the room to be sterilized. In either support configuration, the air sterilization device 1 is installed in the upper part of the room, maintaining a nearly horizontal position. The room to be sterilized is not particularly limited, but could include hospital waiting rooms, schools, government offices, public facilities such as libraries, and offices.

[0032] Figure 8 is a diagram illustrating the irradiation target area AR, showing the air sterilization device 1 from above the room (hereinafter referred to as reference numeral 100). As shown in Figure 8, the air sterilization device 1 is positioned on the upper level and in a corner of the room 100, and irradiates ultraviolet light toward the opposite corner. The irradiation target area AR shown in Figure 8 is 3.0 μW / cm², which is the desired bactericidal power. 2 The above indicates the range of light intensity. In this embodiment, the irradiation target area AR is a range with a depth L1 of approximately 6 m and a width L2 of approximately 6 m, relative to the housing 10. By obtaining such an irradiation target area AR, the inside of the room 100 can be properly sterilized. Note that the above light intensity values ​​and the irradiation target area AR may be changed as appropriate.

[0033] In the vertical direction of the chamber 100, as shown in Figure 5, the range above the horizontal direction at an angle of θA or more, with respect to the housing 10, is defined as the target angle θB corresponding to the irradiation target area AR. By controlling the light distribution to this target angle θB, ultraviolet light is not irradiated into the space at the same height as the housing 10, or into the space below the housing 10.

[0034] The aspherical reflective surface 32M is not limited to a long-focus elliptical shape; for example, it may be a parabolic surface. In the case of a parabolic surface, light from the light-emitting element 21 located at focal point f can be reflected parallel to the optical axis K of the reflective surface 32M. In this case as well, the reflected light can be directed toward the front of the housing 10, and variations in light intensity can be easily suppressed. Furthermore, by making the aspherical reflective surface 32M a diffusing surface that diffuses the light emitted from the light-emitting element 21, it becomes easier to suppress variations in the light intensity (ultraviolet intensity) irradiated in front of the housing 10 and to expand the irradiation range.

[0035] The pair of side plates 31 are reflective members that reflect direct light from each light-emitting element 21 and reflected light from the aspherical reflective surface 32M, and function as second reflective surfaces that control the light distribution of the housing 10 mainly in the left-right direction. The pair of side plates 31 are arranged in parallel. When the pair of side plates 31 are arranged in parallel, the light from each light-emitting element 21 can be distributed at a wide angle. In this embodiment, the pair of side plates 31 are arranged in parallel, and by adjusting parameters such as the distance LD between the side plates 31, the length LS of the side plates 31 (corresponding to the depth of the reflector 30), and the spacing LP between the light-emitting elements 21, a wide-angle light distribution that achieves the above-mentioned illumination target range AR is obtained.

[0036] Furthermore, when distributing light from each light-emitting element 21 at a narrow angle, the pair of side plates 31 can be arranged so that the space between them widens towards the irradiation unit 35, as shown by the dashed line in Figure 6A. In this case, the desired narrow-angle light distribution can be obtained by adjusting the inclination angle θS of the side plates 31 in a top view (see Figure 6A). The surface of the side plates 31 may be a diffusing surface or a reflective surface that is not a diffusing surface.

[0037] The light-shielding plate 23 is a light-shielding member that blocks light outside the range of the target angle θB, as shown in the side view of the air sterilization device 1 in Figure 5. The light-shielding plate 23 is formed in the shape of a rectangular flat plate of a certain thickness, is positioned on the irradiation section 35 side relative to the light-emitting element 21, and protrudes upward from the light-emitting element 21. In Figure 5, the offset amount of the light-shielding plate 23 from the end face 23T relative to the light-emitting element 21 (the light-emitting center of the light-emitting element 21) is indicated by the symbol α, and the protrusion amount of the light-shielding plate 23 relative to the light-emitting element 21 (the height from the light-emitting surface of the light-emitting element 21 to the upper surface 23A of the light-shielding plate 23) is indicated by the symbol β.

[0038] As described above, the end face 23T of the light-shielding plate 23 on the side of the light-emitting element 21, and the upper surface 23A of the light-shielding plate 23 are treated with a light-absorbing surface treatment. With these configurations, direct light incident from the light-emitting element 21 to the end face 23T of the light-shielding plate 23 is blocked, and reflected light that is reflected by the aspherical reflective surface 32M and the pair of side plate portions 31 and incident on the end face 23T and upper surface 23A of the light-shielding plate 23 is absorbed. Although some of the light reflected by the aspherical reflective surface 32M and the pair of side plate portions 31 is incident on the end face 23T of the light-shielding plate 23, it has little effect on the direct light from the light-emitting element 21.

[0039] In this case, the end face 23T of the light-shielding plate 23 blocks light in the range of angle θA shown in Figure 5. Furthermore, the upper surface 23A of the light-shielding plate 23 absorbs light incident on the upper surface 23A from the aspherical reflective surface 32M and the pair of side plate portions 31, thereby controlling the light emitted below the range of angle θA. As a result, light in the range of the target angle θB is emitted from the aperture of the reflector 30. Furthermore, since the surface of the substrate 20 is also treated with a light-absorbing surface treatment, unwanted light is absorbed.

[0040] Figure 9A shows an example of arranging the air sterilizer 1 in a large room 100, and Figure 9B shows an example of arranging the air sterilizer 1 in a room 100 where the width is narrower than the depth. In Figure 9A, the large room 100 is properly sterilized by arranging the air sterilizer 1 in each corner of the room 100. In Figure 9B, the room 100 is properly sterilized by arranging the air sterilizer 1 opposite each other on both sides in the longitudinal direction (depth direction). In this way, by setting the arrangement of the air sterilizer 1 according to the size and shape of the room 100, it is possible to properly sterilize various rooms 100.

[0041] As described above, the air sterilization device 1 includes, within the housing 10, a reflector 30 positioned with its opening facing the front of the housing 10, a light-emitting element 21 positioned at the focal point f of the reflector 30 and emitting light including ultraviolet light, and a light-shielding plate 23 positioned below the reflector 30 and blocking at least the downward-facing light of the above light. The reflector 30 reflects the light from the light-emitting element 21, and the above light is irradiated from the irradiation window 1A at the front of the housing 10. With this configuration, when the light from the light-emitting element 21 is irradiated toward the front of the housing 10, the light incident on the end face 23T and the upper surface 23A of the light-shielding plate 23 can be blocked and absorbed. The light incident on the end face 23T and the upper surface 23A of the light-shielding plate 23 includes a portion of the direct light from the light-emitting element 21 and light reflected downward from the reflector 30. This allows direct light from the light-emitting element 21 and reflected light from the reflector 30 to be emitted towards the front of the housing 10.

[0042] Therefore, compared to configurations using ultraviolet lamps, the light-shielding structure is simpler, the efficiency of light utilization in the irradiated area (AR) is improved, and the device can be made lighter and more compact while ensuring sterilization performance. Furthermore, the light-shielding plate 23 is positioned relative to the light-emitting element 21 with a predetermined offset amount α on the irradiation side 35, and protrudes relative to the light-emitting element 21 with a predetermined protrusion amount β, thereby shielding and absorbing light that directly incident from the light-emitting element 21 and light that incident from the reflector 30. As a result, the range of light shielding and absorption can be adjusted by adjusting the offset amount α and the upward protrusion amount β of the light-shielding plate 23.

[0043] In this configuration, the light distribution of the light-emitting element 21 is controlled by the offset amount α and the protrusion amount β to a target angle θB, which is an angle θA or greater upward in the horizontal direction relative to the housing 10. This prevents light from being emitted into the area within angle θA and the space below that angle.

[0044] Furthermore, the reflector 30 includes an aspherical reflective surface 32M that defines the upper position of the aperture of the reflector 30, and a pair of side plate portions 31 that define the left and right positions of the aperture. The pair of side plate portions 31 are attached to the base 22, and a light-shielding plate 23 is attached to the upper surface 22A of the base 22, so that the illumination portion 35 corresponding to the aperture of the reflector 30 is formed in a substantially rectangular shape. With these configurations, the aspherical reflective surface 32M and the pair of side plate portions 31 control the light distribution of the light-emitting element 21, and a portion of that light is shielded and absorbed by the light-shielding plate 23, allowing light to be efficiently emitted from the substantially rectangular illumination portion 35.

[0045] Furthermore, the housing 10 is made of metal, and the substrate 20 of the light-emitting element 21 is mounted to the bottom plate 14A of the housing 10 in a way that allows heat to be conducted. With this configuration, the light-emitting element 21 to the bottom plate 14 This promotes heat conduction to A, allowing the heat from the light-emitting element 21 to be dissipated using the housing 10. In this case, the bottom plate of the housing 10 14 By setting the thickness of A to 5 mm or more and 10 mm or less, sufficient cooling effect for the light-emitting element 21 can be obtained.

[0046] Furthermore, the pair of side plates 31 are arranged parallel to each other so that light from the light-emitting element 21 can be distributed at a wide angle. Therefore, wide-angle light distribution is possible with a simple configuration. On the other hand, by arranging the pair of side plates 31 so that the space between them widens towards the irradiation unit 35, enabling narrow-angle light distribution from the light-emitting element 21, a simple configuration can be used to achieve narrow-angle light distribution.

[0047] Furthermore, there are multiple light-emitting elements 21, which are arranged at equal intervals in a horizontal row parallel to the opening of the reflector 30. By arranging multiple light-emitting elements 21, it becomes easier to obtain sufficient light intensity, and by arranging the light-emitting elements 21 as described above, the left-right balance of illumination in the horizontal plane can be achieved. In addition, by adjusting the spacing of the number of light-emitting elements 21, it becomes easier to sterilize rooms 100 of different sizes and shapes. Depending on the size and shape of the room 100 to be sterilized, the air sterilization devices 1 may be arranged in a staggered pattern to uniformly irradiate the upper space of the room 100 with ultraviolet light.

[0048] Furthermore, since the peak wavelength of the light-emitting element 21 is in the range of 260 to 280 nm, it can emit light suitable for sterilization. In addition, a human presence sensor 1C is installed to detect people in the front surroundings of the housing 10, and under the control of the control board 17, the lighting of the light-emitting element 21 is prohibited when a person is detected by the human presence sensor 1C. This prevents the light-emitting element 21 from lighting up when a person is present in the front surroundings of the air sterilization device 1, thereby preventing ultraviolet light from being irradiated to people. The control board 17 may also perform illuminance correction (also called UV output correction) to correct the illuminance of the light-emitting element 21 that changes over time. The control contents of the control board 17 may be changed as appropriate.

[0049] The above embodiments are merely illustrative examples of one aspect of the present invention, and can be modified and applied at will without departing from the spirit of the invention. In the above embodiment, the application of the present invention to the air sterilization device 1 shown in Figure 1 and the like is illustrated, but the invention is not limited thereto. For example, the shape of the housing 10 and the like may be changed as appropriate. The light shielding plate 23 may also be changed as appropriate within the range that allows for light shielding so that the desired light distribution can be obtained. Furthermore, the reflector 30 may also be changed as appropriate within the range that it is positioned with an opening facing the front of the housing 10 and has an aspherical reflective surface. In addition, the example given is that the air sterilization device 1 is installed in a room 100 separated by walls, ceilings, etc., but the invention is not limited thereto, and it may be installed in an appropriate space and sterilized within that space. [Explanation of Symbols]

[0050] 1. Air sterilization device 1A Irradiation window 1B Indicator light 1C Motion Sensor 2 Wall mounting brackets 5. Ceiling mounting bracket 10 cabinets 11 Front frame 13 Upper enclosure 14 Lower enclosure 14A Bottom plate of the lower enclosure 17 Control board 20 circuit boards 21 Light-emitting element 22 base 23 Light-blocking board 30 Reflector 31 Side plate part 32M Aspheric reflective surface 35 Irradiation area 100 rooms (space) D. Thickness of base plate 14A f focus AR illumination range α offset amount β Protrusion amount

Claims

1. Inside the enclosure, A reflector is positioned in front of the housing with the opening facing it, A light-emitting element, which emits light including ultraviolet light, is positioned at the focal point of the aspherical reflective surface of the aforementioned reflector. The system includes a light-shielding plate positioned below the reflecting mirror, which blocks at least the light directed downwards. The light from the light-emitting element is reflected by the reflector, and the light is irradiated from the illumination window at the front of the housing. The light-shielding plate is positioned with respect to the light-emitting element on the irradiation side corresponding to the aperture of the reflector, with a predetermined offset amount, and protrudes from the light-emitting element by a predetermined amount, thereby shielding and absorbing light that is incident directly from the light-emitting element and light that is incident from the reflector. Air sterilization device.

2. The reflecting mirror comprises an aspherical reflective surface that defines the upper position of the opening, and a pair of side plate portions that define the left and right positions of the opening. The pair of side plates are attached to the base, the light-shielding plate is attached to the upper surface of the base, and the illumination portion corresponding to the opening of the reflector is formed in a substantially rectangular shape. The air sterilization device according to claim 1.

3. The aforementioned casing is made of metal, The substrate of the light-emitting element is mounted to the bottom plate of the housing in a manner that allows heat to be conducted. The air sterilization device according to claim 1 or 2.

4. The thickness of the bottom plate of the aforementioned enclosure is 5 mm or more and 10 mm or less. The air sterilization device according to claim 3.

5. There are multiple such light-emitting elements. The light-emitting elements are arranged in a horizontal row parallel to the aperture of the reflector at equal intervals. The air sterilization device according to claim 1 or 2.

6. The peak wavelength of the light-emitting element is in the range of 260 to 280 nm. The air sterilization device according to claim 1 or 2.

7. A motion sensor is installed in the front of the housing to detect people in the surrounding area, and when a person is detected by the motion sensor, the illumination of the light-emitting element is prohibited. The air sterilization device according to claim 1 or 2.

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