JP7375367B2 - Sterilizers and indoor sterilization systems - Google Patents

Description

The present invention relates to a sterilization device and an indoor sterilization system that sterilize spaces, surfaces of articles, etc. using ultraviolet rays.

BACKGROUND ART Conventionally, as an indoor sterilization device equipped with an ultraviolet light source, there is a technique described in Patent Document 1, for example. This technology involves attaching an indoor sterilizer to the wall of the room, which has a horizontal irradiation unit that emits ultraviolet rays in the horizontal direction and a downward irradiation unit that emits ultraviolet rays diagonally downward. This technology uses emitted ultraviolet light to sterilize the entire indoor area. Here, the horizontal irradiation unit and the downward irradiation unit irradiate ultraviolet rays with a wavelength of 254 nm. Since ultraviolet rays with a wavelength of 254 nm are harmful to the human body, the technology described in Patent Document 1 is designed to prevent the effects of ultraviolet irradiation on the human body by turning off the downward irradiation unit when there are people in the room. I have to.

Japanese Patent Application Publication No. 2018-130131

However, sterilizers used for air purification purposes are often installed indoors where people are present. In the technique described in Patent Document 1, the downward illumination unit needs to be turned off frequently, and indoor air cannot be efficiently sterilized.
Therefore, the present invention provides a sterilization device and an indoor sterilization system that can effectively sterilize indoor air without affecting the human body due to ultraviolet rays even when there are people in the room. The challenge is to do so.

In order to solve the above problems, one aspect of the sterilization device according to the present invention includes a casing, a first light source that is disposed within the casing and emits ultraviolet rays with a peak wavelength of 222 nm, and a a first light source section having an optical filter that transmits ultraviolet rays having a wavelength of 222 nm among the emitted ultraviolet rays, and a light attenuating section that attenuates the ultraviolet rays emitted from the first light source; and disposed within the housing. and a second light source section having a second light source that emits ultraviolet rays within a wavelength range of 190 nm to 300 nm, and the first light source section is located at least in the lower part of the vertically divided space. The space is irradiated with ultraviolet rays emitted from the first light source and passed through the optical filter and the light attenuation section, and the second light source section illuminates only the upper space of the vertically divided space. The ultraviolet rays emitted from the second light source are irradiated.

In this way, sterilization can be performed by irradiating different ultraviolet rays to the vertically divided spaces. Here, at least the lower space can be irradiated with attenuated ultraviolet rays having a wavelength of 222 nm. Therefore, a space where people may be present can be sterilized by irradiating ultraviolet rays that do not affect the human body. Further, the upper space where no one is present is irradiated with ultraviolet rays that include a wavelength range of 190 nm to 300 nm that may affect the human body. Therefore, the second light source section does not require a mechanism for removing ultraviolet rays in a wavelength range that may affect the human body, and can have an inexpensive and simple configuration.

Moreover, in the above-mentioned sterilizer, the first light source may be lit all the time. The ultraviolet rays emitted from the first light source section to the lower space are ultraviolet rays that do not affect the human body. Therefore, even if there is a person in the lower space, there is no need to turn off the first light source, and the first light source can be kept on at all times. Therefore, it is not necessary to control the lighting of the first light source depending on the presence or absence of a human body in the lower space.
Furthermore, in the above-mentioned sterilization device, the light attenuation section may be constituted by a plate-like member having a plurality of openings. In this case, the ultraviolet rays emitted from the first light source can be reduced with a simple configuration. In addition, the amount of ultraviolet rays passing through the light attenuation part can be adjusted depending on the number and size of the openings, so the amount of ultraviolet rays irradiated to the lower space can be adjusted, and the amount of radiation to the human body can be adjusted appropriately. I can do it.

Further, in the above sterilization device, the first light source section irradiates the upper space with ultraviolet rays emitted from the first light source and not passing through at least one of the optical filter and the light attenuation section. Good too. In this way, the upper space may be irradiated with light that is not properly converted into ultraviolet light that does not affect the human body in the first light source section. In this case, the irradiation dose of ultraviolet rays in the upper space can be increased, and the sterilization effect can be enhanced.
Furthermore, in the above sterilizer, the first light source is attached to the lower surface of the upper wall of the housing within the housing and emits ultraviolet rays downward, and the second light source is inside the housing. is attached to a side surface of the housing, emits ultraviolet rays in a horizontal direction, and the optical filter and the light attenuation section are arranged on a surface of the housing that faces the surface on which the first light source is attached, An opening may be formed in a surface of the casing that faces the surface to which the second light source is attached. In this case, the upper space and the lower space can be appropriately divided and irradiated with separate ultraviolet rays.

Further, in the above sterilizer, the first light source may be a Kr-Cl excimer lamp. In this case, the spectrum can have a peak at a wavelength of 222 nm, which does not reach the nucleus of human cells but reaches the nucleus of bacterial cells.
Furthermore, in the above sterilizer, the second light source may be a low pressure mercury lamp. In this case, the second light source section can be constructed at low cost.
Further, in the above sterilizer, the second light source may be a Kr-Cl excimer lamp. In this case, the second light source section can emit ultraviolet rays that have little effect on the human body.

Furthermore, one aspect of the indoor sterilization system according to the present invention includes any of the above-mentioned sterilization devices installed above the room. In this way, by installing the above-mentioned sterilizer above the room, the room is divided into an upper space where people are not present and a lower space where people can be present, and sterilization is carried out by irradiating different types of ultraviolet rays. be able to. The lower space can be irradiated with ultraviolet rays with a wavelength of attenuated 222 nm, so even if there are people in the room, the air in the room can be irradiated without any effect of ultraviolet rays on the human body. Can be effectively sterilized.
Moreover, in the indoor sterilization system described above, the sterilizer may be attached to at least one of a ceiling and a wall in the room. In this case, the room can be appropriately sterilized without affecting the human bodies present in the room.

Furthermore, in the indoor sterilization system described above, at least a portion of the walls and floor of the room may be provided with an ultraviolet reflector that reflects ultraviolet rays. In this case, since the ultraviolet rays emitted from the light source can be reflected by the ultraviolet reflector, the areas that are not directly irradiated with ultraviolet rays from the light source can be indirectly irradiated with ultraviolet rays, resulting in more effective sterilization. can do.
Furthermore, in the indoor sterilization system described above, the ultraviolet reflector may be made of fluororesin. In this case, ultraviolet rays can be appropriately reflected.

According to one aspect of the present invention, even if there are people in the room, the indoor air can be effectively sterilized without any effect of ultraviolet rays on the human body.

It is a schematic diagram showing an indoor sterilization system in this embodiment. FIG. 3 is a diagram showing the absorption level of ultraviolet rays into DNA. FIG. 3 is a diagram showing a spectrum of a Kr-Cl excimer lamp. 4 is an enlarged view of a part of FIG. 3. FIG. This is an example of a light reduction section. This is an example of a light reduction section. It is a perspective view showing an example of composition of a sterilization device. FIG. 2 is a cross-sectional view showing a configuration example of a sterilizer. FIG. 2 is a perspective view showing a configuration example of an excimer lamp. FIG. 2 is an exploded perspective view showing a configuration example of an excimer lamp. It is a sectional view showing another example of composition of a sterilization device. It is a sectional view showing another example of composition of a sterilization device. It is a side view showing an example of installation of a sterilizer. It is a top view showing an example of installation of a sterilizer. It is a top view which shows another example of installation of a sterilizer. It is a top view which shows another example of installation of a sterilizer. It is a schematic diagram which shows another example of an indoor sterilization system. It is a schematic diagram which shows another example of an indoor sterilization system.

Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a schematic diagram showing an indoor sterilization system 1000 in this embodiment.
This indoor sterilization system 1000 is a system that uses ultraviolet light to sterilize bacteria, viruses, etc. present in the indoor air and on the surfaces of articles. The room can be, for example, a hospital or a toilet.
As shown in FIG. 1, an indoor sterilization system 1000 includes a sterilization device 100. The sterilizer 100 is installed above the room 200 (for example, at a location higher than a person's height), and irradiates separate ultraviolet light into a space divided into upper and lower sections where no people are present and a space where people can be present. , sterilize spaces and surfaces. Specifically, the sterilizer 100 sterilizes a first space 201 where no people are present by irradiating ultraviolet light that includes a wavelength range that may affect the human body, and sterilizes the first space 201 where no people are present. The space is sterilized by irradiating it with ultraviolet light that does not affect the human body.

The sterilization device 100 includes a first light source 101, a second light source 102, an optical filter 103, and a light attenuation unit 104.
The first light source 101 emits ultraviolet light UV1 having a sterilizing effect downward. Specifically, the ultraviolet light UV1 is ultraviolet light having a peak wavelength of 222 nm. For example, the first light source 101 can be a Kr-Cl (krypton-chlorine) excimer lamp.
The second light source 102 emits UV2, which has a germicidal effect, in the horizontal direction. Specifically, the ultraviolet light UV2 is ultraviolet light in the wavelength range of 190 nm to 300 nm. For example, the second light source 102 is a low-pressure mercury lamp and can emit ultraviolet light with a wavelength of 254 nm.

FIG. 2 is a diagram showing the absorption level of ultraviolet rays into DNA. FIG. 2 shows the absorption level of thymine, which is one of the bases that make up DNA. In FIG. 2, the horizontal axis is the wavelength of ultraviolet rays, and the vertical axis is the absorption coefficient.
As shown in FIG. 2, the absorption coefficient of DNA is the same at a wavelength of 222 nm and a wavelength of 254 nm. In other words, when irradiating ultraviolet rays with a wavelength of 222 nm and when irradiating ultraviolet rays with a wavelength of 254 nm, the level of action on DNA in bacterial cells is the same, and the bactericidal effect (sterilization speed) is also at the same level. Recognize.

On the other hand, it is known that ultraviolet rays with a wavelength of 254 nm can penetrate the epidermis of human skin and damage living cells. On the other hand, ultraviolet rays with a wavelength of 222 nm have a higher absorption coefficient for proteins than ultraviolet rays with a wavelength of 254 nm, and are absorbed by the outermost surface of the skin and eyes of the human body. Therefore, even if the human body is irradiated with ultraviolet rays with a wavelength of 222 nm, there is no risk of adverse effects such as skin cancer or cataracts.
In other words, ultraviolet rays with a wavelength of 222 nm are light that can provide a sterilizing effect without affecting the human body (skin, eyes, etc.).

Therefore, in this embodiment, among the vertically divided spaces, at least the second space 202, which is the lower space where the person 301 can exist, is irradiated with ultraviolet rays having a wavelength of 222 nm. On the other hand, the first space 201, which is the upper space where no person 301 is present, may be irradiated with ultraviolet rays that can have a sterilizing effect regardless of the effect on the human body. Therefore, in this embodiment, the first space 201 is irradiated with ultraviolet rays of 190 nm to 300 nm.

As shown in FIG. 2, the absorption coefficient of DNA for ultraviolet light with a wavelength exceeding 300 nm is zero. In other words, ultraviolet light with a wavelength exceeding 300 nm has no bactericidal effect. Therefore, as described above, the upper limit of the wavelength range of the ultraviolet light emitted by the second light source 102 is set to 300 nm. On the other hand, it is known that ultraviolet light (vacuum ultraviolet light) with a wavelength of less than 190 nm generates ozone. Therefore, as described above, the lower limit of the wavelength range of the ultraviolet rays emitted by the second light source 102 is set to 190 nm.

Returning to FIG. 1, the optical filter 103 is an optical filter that cuts unnecessary wavelengths of the ultraviolet rays UV1 emitted from the first light source 101. Specifically, the optical filter 103 cuts ultraviolet rays with a wavelength other than 222 nm, and transmits ultraviolet rays with a wavelength of 222 nm.
As shown in Figure 3, the spectrum of the Kr-Cl excimer lamp has a peak at a wavelength of 222 nm, which does not affect the human body. It also contains a small amount of light other than 222 nm. In other words, the Kr--Cl excimer lamp emits a small amount of light in a wavelength range that can affect the human body.
Of the ultraviolet rays UV1 emitted from the first light source 101, the optical filter 103 transmits and emits only the ultraviolet rays UV1' having a wavelength of 222 nm.

The light attenuation unit 104 attenuates the ultraviolet light UV1 emitted from the first light source 101. In this embodiment, the light attenuation unit 104 attenuates the ultraviolet light UV1' emitted from the first light source 101 via the optical filter 103. The light attenuation portion 104 can be formed, for example, by depositing a transparent multilayer film on quartz glass.
For example, as shown in FIG. 5, this light reduction section 104 can be a plate-like member having a plurality of openings 104a. Here, the cross-sectional shape of the opening 104a may be circular as shown in FIG. 5, or rectangular as shown in FIG. Further, the aperture degree (the ratio of the area of the opening 104a to the total area of the plate-like member) in the light attenuation part 104 is such that the irradiation dose of the ultraviolet rays UV" after being attenuated by the light attenuation part 104 is below a predetermined value, for example. , so that the amount of radiation exposure for the human body is below the maximum allowable value of 25 mJ/ ^cm2 .

In this way, the sterilizer 100 includes a first light source 101 that emits ultraviolet rays UV1 with a peak wavelength of 222 nm, and an optical filter 103 that transmits ultraviolet rays UV1' with a wavelength of 222 nm out of the ultraviolet rays UV1 emitted from the first light source 101. and a light attenuation unit 104 that attenuates the ultraviolet light UV1 emitted from the first light source 101, and a second light source unit that emits ultraviolet light UV2 within the wavelength range of 190 nm to 300 nm. a second light source section having a light source 102.
The first light source section emits light from the first light source 101 into a second space 202, which is a lower space among the spaces divided above and below the room 200, and filters the optical filter 103 and the light attenuation section 104. The second light source unit irradiates the ultraviolet rays emitted from the second light source 102 only to the first space 201, which is the upper space of the space divided into the upper and lower parts of the room 200. Irradiate with UV2.

In addition, when the optical filter 103 is arranged apart from the first light source 101 as shown in FIG. Ultraviolet light UV1 can be irradiated. Furthermore, when the optical filter 103 and the light attenuation section 104 are arranged apart from each other, the first light source section provides ultraviolet light emitted from the first light source 101 and transmitted through the optical filter 103 into the first space 201. UV1' can be irradiated.
That is, in this embodiment, the first space 201 where no one is present is irradiated with ultraviolet rays with a wavelength of 222 nm and ultraviolet rays with a wavelength of 254 nm, and sterilization is performed with ultraviolet rays that include a wavelength range that may affect the human body. . On the other hand, in the second space 202, only the attenuated ultraviolet rays having a wavelength of 222 nm are irradiated, and sterilization is performed using ultraviolet rays having a wavelength that does not affect the human body. This second space 202 is irradiated with 222 nm ultraviolet rays that have been reduced to a dose that does not affect the human body, so it is necessary to stop the irradiation of ultraviolet rays even while a person is present in the second space 202. Instead, the first light source 101 can be turned on all the time.

FIG. 7 is an example of a specific configuration of the sterilizer 100.
As shown in FIG. 7, the sterilizer 100 includes a casing 105 having an opening 105a, and a first light source 101 is attached to the lower surface of the upper wall of the casing 105 within the casing 105. The second light source 102 may be attached to the side surface of the housing 105 inside the housing 105 . In this case, as shown in FIG. 8, the first light source 101 emits ultraviolet light in a downward direction, and the second light source 102 emits ultraviolet light in a horizontal direction.

An optical filter 103 and a light attenuation unit 104 can be arranged at a position facing the surface of the housing 105 on which the first light source 101 is attached. For example, the optical filter 103 can be attached to the light output side of the first light source 101. Furthermore, the light reduction section 104 can have a configuration in which a plurality of openings are formed in the lower surface of the housing 105.
Furthermore, the opening 105a can be formed on a surface of the housing 105 that faces the surface on which the second light source 102 is attached.

FIG. 9 is a conceptual diagram of the first light source 101 to which the optical filter 103 is attached. FIG. 10 is an exploded perspective view of the first light source 101 with the optical filter 103 shown in FIG. 9.
As shown in FIG. 10, the first light source 101 includes a housing 111 and a lid 112. Inside the housing 111, an electrode block 121 and two excimer lamps 122, which are arranged apart from each other, are housed. The excimer lamp 122 is placed in a groove provided in the electrode block 121, and is tightly attached and fixed to the electrode block 121 by a fixing member 123. Note that the method of fixing the excimer lamp 122 is not limited to the above.
Further, an optical filter 103 is attached to the center portion of the lid portion 112. For example, an opening may be provided in the center of the lid 112 and the opening may be closed with the optical filter 103.

The excimer lamp 122 has an arc tube made of a material such as quartz that transmits ultraviolet rays. One end of the arc tube is sealed, and after the inside of the tube is evacuated, a discharge space is filled with luminescent gas, and the other end is sealed. The luminescent gas can be Kr-Cl. In this case, the excimer lamp 122 emits ultraviolet light with a peak wavelength of 222 nm.
When a high frequency AC high voltage of approximately 50 kHz to 5 MHz is applied to the electrode block 121 from a lighting power source, this high voltage is applied via the arc tube. At this time, plasma is generated in the discharge space in which the luminescent gas is sealed, and the atoms of the luminescent gas are excited to become an excimer state, and when these atoms shift to the ground state, excimer light emission occurs.

A sterilizer 100 shown in FIG. 7 has a first light source 101 with an optical filter 103 shown in FIG. 9 attached to the lower surface of the upper wall of a housing 105 with the lid 112 facing downward.
With such a configuration, as shown in FIG. 8, the ultraviolet ray UV1' with a wavelength of 222 nm emitted from the first light source 101 and emitted via the optical filter 103 passes through the light attenuation section 104, thereby reducing its irradiation dose. The ultraviolet rays UV1'' with a wavelength of 222 nm are reduced and irradiated downward from the housing 105 as attenuated ultraviolet rays UV1'' with a wavelength of 222 nm. The light is irradiated horizontally from 105a.

In addition, in the sterilization apparatus 100 shown in FIG. 8, the second light source 102 is a low-pressure mercury lamp that emits ultraviolet rays UV2 with a wavelength of 254 nm. Any light source that emits ultraviolet rays in the wavelength range of 300 nm may be used, and a Kr--Cl excimer lamp that emits ultraviolet rays with a peak wavelength of 222 nm may be used. That is, as shown in FIG. 11, the second light source 102, which is a Kr--Cl excimer lamp, may be attached to the side surface of the housing 105, and the ultraviolet ray UV2' having a peak wavelength of 222 nm may be emitted in the horizontal direction. In this way, the second light source 102 may have the same configuration as the first light source 101. However, since a low-pressure mercury lamp is cheaper than a Kr--Cl excimer lamp, the sterilizer 100 can be constructed at a lower cost by using a low-pressure mercury lamp as the second light source 102.

Furthermore, in the sterilizer 100 shown in FIG. 8, the case has been described in which the optical filter 103 is attached to the first light source 101, but as shown in FIG. It may also be arranged near the light reduction section 104.
Furthermore, in the sterilizer 100 shown in FIGS. 8, 11, and 12, a case has been described in which the lower surface of the housing 105 constitutes the light attenuation part 104, but the light attenuation part 104 may be provided separately from the housing 105. good. For example, an opening may be formed in the surface of the casing 105 to which the first light source 101 is attached, and the light reduction portion 104 may be placed at a position facing the surface of the casing 105 to which the first light source 101 is attached. You can also do this.

The sterilizer 100 can be installed above the wall of the indoor room 200, as shown in a side view of the indoor room 200 in FIG. At this time, the sterilizer 100 can be installed in the center of the wall of the room 200, as shown in a top view of the room 200 in FIG.
In this case, as shown in FIGS. 13 and 14, the sterilizer 100 irradiates ultraviolet rays UV2 in the horizontal direction toward the wall opposite to the wall on which the sterilizer 100 is installed. That is, the sterilization device 100 irradiates the first space 201 where no people are present with ultraviolet light UV2 having a wavelength of 254 nm. Furthermore, as shown in FIG. 13, the sterilizer 100 irradiates the ultraviolet rays UV1'' downward.In other words, the sterilizer 100 irradiates the second space 202 where people exist with ultraviolet rays UV1'' at a reduced wavelength of 222 nm. irradiate with ultraviolet rays of UV1”.
As shown in FIG. 13, when the sterilizer 100 has the configuration shown in FIG. 8, the room 200 is divided into a first space 201 and a second space 202 by the light attenuation part 104 (the lower surface of the housing 105). Ru.

Note that the number of installed sterilizers 100 and the installed positions are not limited to the number of installed sterilizers 100 and the installed positions shown in FIG. For example, the sterilizer 100 may be suspended from the ceiling of the room 200. In this case, for example, as shown in FIG. 15, four sterilizers 100 may be installed in the center of the ceiling and the four walls may be irradiated with ultraviolet rays UV2. Alternatively, as shown in FIG. 16, four sterilizers 100 may be installed in the center of the ceiling, and the ultraviolet rays UV2 may be irradiated toward each corner. However, when the sterilizer 100 is installed in the center of the ceiling, it is installed in a position that does not interfere with the lighting installed on the ceiling.

As explained above, the indoor sterilization system 1000 in this embodiment includes the sterilization device 100 installed above the room 200. The sterilization device 100 includes a housing 105 and a first light source section and a second light source section disposed within the housing 105.
The first light source section includes a first light source 101 that emits ultraviolet rays with a peak wavelength of 222 nm, an optical filter 103 that transmits ultraviolet rays with a wavelength of 222 nm out of the ultraviolet rays emitted from the first light source 101, and a first light source. A light attenuation unit 104 that attenuates the ultraviolet light emitted from the light source 101 is provided. Further, the second light source section includes a second light source 102 that emits ultraviolet light within a wavelength range of 190 nm to 300 nm. The first light source section transmits ultraviolet rays UV1'' emitted from the first light source 101 and passed through the optical filter 103 and the light attenuation section 104 into a second space 202 which is a lower space of the vertically divided space. The second light source unit irradiates ultraviolet light UV2 emitted from the second light source 102 only to the first space 201, which is the upper space of the vertically divided space.

Here, the first light source 101 is attached to the lower surface of the upper wall of the housing 105 within the housing 105, and emits ultraviolet light UV1 downward. Further, the second light source 102 is attached to the side surface of the housing 105 within the housing 105, and emits ultraviolet light UV2 in the horizontal direction. An optical filter 103 and a light reduction unit 104 are arranged at a position facing the surface of the casing 105 to which the first light source 101 is attached, and an optical filter 103 and a light attenuation unit 104 are arranged opposite to the surface of the casing 105 to which the second light source 102 is attached. An opening 105a is formed on the surface.

Thereby, the sterilizer 100 can perform sterilization by irradiating different ultraviolet rays to the vertically divided spaces. Specifically, the first space 201 where no people exist is irradiated with ultraviolet rays that include a wavelength range of 190 nm to 300 nm that may affect the human body, and the first space 201 where there are no people is The second space 202 can be irradiated with ultraviolet rays with a wavelength of 222 nm adjusted to a dose that does not affect the human body. Therefore, even if there are people in the room 200, the air in the room 200 can be effectively sterilized without any effect of ultraviolet rays on the human body.

Further, as shown in FIG. 8, when the optical filter 103 is attached to the light output side of the first light source 101 and the light attenuation section 104 is configured on the lower surface of the housing 105, the first light source section The space 201 can be irradiated with ultraviolet light UV1' that is emitted from the first light source 101 and has not passed through the light attenuation unit 104. In this case, the first space 201 is irradiated with the ultraviolet rays UV1' from the first light source and the ultraviolet rays UV2 from the second light source, compared to the case where only the ultraviolet rays UV2 are irradiated. Therefore, the irradiation dose to the first space 201 can be increased, and the sterilization effect can be enhanced.

Further, for example, as shown in FIG. 12, when the optical filter 103 is placed at a position facing the first light source 101 and separated from the first light attenuation 101, the first light source section is located in the first space. 201 can be irradiated with ultraviolet light UV1 emitted from the first light source 101. Also in this case, similarly to the configuration shown in FIG. 8 described above, the dose of ultraviolet rays irradiated to the first space 201 can be increased, and the sterilization effect can be enhanced.

Furthermore, since the ultraviolet rays UV1'' emitted from the first light source section to the second space 202 are ultraviolet rays that do not affect the human body, the first light source 101 is Therefore, it is not necessary to control whether the first light source 101 is turned on or off, and the configuration can be simplified.

Furthermore, the light attenuation section 104 can be configured by a plate-like member having a plurality of openings 104a, as shown in FIGS. 5 and 6. In this way, the ultraviolet rays emitted from the first light source 101 can be attenuated with a simple configuration. In addition, since the dose of ultraviolet rays passing through the light attenuation part 104 can be adjusted by the number and size of the openings 104a, the dose of ultraviolet rays UV1'' irradiated to the second space 202, which is the lower space, can be adjusted to the human body. The amount of radiation exposure can be appropriately adjusted to the permissible amount.

In addition, when the light attenuation section 104 is constituted by a plate-like member having a plurality of openings 104a as shown in FIGS. Only the light that is detected can pass through.
The optical filter 103 has a characteristic that its transmittance varies depending on the incident angle of light rays. Specifically, when ultraviolet light with a wavelength of 220 nm is incident on the optical filter 103 at an incident angle of 0°, 80% is transmitted, but at an incident angle of 40° or more, the transmittance becomes almost 0. Conversely, at an incident angle of 40° or more, ultraviolet light with a wavelength of 230 nm or more, which may affect the human body, is transmitted.
Therefore, if the light attenuation unit 104 is configured to pass the ultraviolet rays incident perpendicularly to the optical filter 103, only the ultraviolet rays with a wavelength of 222 nm can be irradiated to the second space 202, and there is no need to affect the human body. UV rays can be appropriately prevented from reaching the second space 202.

As described above, in the indoor sterilization system 1000 according to the present embodiment, a high dose of ultraviolet rays including a wavelength range that may affect the human body is irradiated to a space where no people are present, and It is possible to irradiate a low dose of ultraviolet rays excluding the wavelength range that could potentially affect the human body to a space with a high possibility of harm. Therefore, even if there are people in the room, the indoor air can be effectively sterilized without any effect of ultraviolet rays on the human body.

(Modified example)
As shown in FIG. 17, the indoor sterilization system 1000 in the above embodiment may include an ultraviolet reflector 210 that reflects ultraviolet rays on at least a portion of the wall of the indoor room 200. The ultraviolet reflector 210 can be made of fluororesin. For example, the ultraviolet reflector 210 can be formed by spraying a fluororesin onto a wall surface.
It is preferable that the ultraviolet reflector 210 is provided on a wall in the first space 201 that is irradiated with the ultraviolet light UV2 emitted horizontally from the sterilizer 100. Further, the ultraviolet reflector 210 is preferably provided on the wall and floor of the second space 202. As a result, the ultraviolet light UV1'' emitted downward from the sterilizer 100 is reflected by the ultraviolet reflector 210 in the second space 202, and the ultraviolet light UV1'' is also reflected in the area that would be in the shadow if it were irradiated from directly above. Ultraviolet light UV1'' can be irradiated. Therefore, for example, bacteria etc. attached to the back of the top plate of the desk 302 can be sterilized.

Further, in the sterilizing device 100 in the above embodiment, the light attenuation unit 104 may be arranged immediately before the first light source 101, as shown in FIG. In this case, the ultraviolet rays UV1 emitted from the first light source 101 are attenuated by the light attenuation unit 104, and then transmitted through the optical filter 103 and emitted as the attenuated ultraviolet rays UV1'' with a wavelength of 222 nm. The second space 202 is irradiated with ultraviolet light UV1'' from the first light source. In the first space 201, ultraviolet rays UV1 emitted from the first light source 101, ultraviolet rays emitted from the first light source 101 and passed through the dimming section 104, and ultraviolet rays emitted from the second light source 102 are present. Ultraviolet light UV2 is irradiated.

In this way, the first light source unit may irradiate the first space 201 with ultraviolet rays that are emitted from the first light source 101 and have not passed through the optical filter 103. Also in this case, the same effects as the sterilizer 100 shown in FIG. 1 described above can be obtained.
Further, in this case, the light attenuation unit 104 can cause the ultraviolet rays UV1 emitted from the first light source 101 to enter the optical filter 103 perpendicularly (at an incident angle of 0°). Therefore, it is possible to appropriately irradiate the second space 202 with ultraviolet rays having a wavelength of 222 nm, and prevent the second space 202 from being irradiated with unnecessary ultraviolet rays that would affect the human body.

Furthermore, in the embodiment described above, a case has been described in which the first light source 101 is always turned on, but the first light source 101 may be turned off as necessary. For example, a human sensor or the like may be provided in the room 200, and when the presence of a person in the second space 202 is detected, the first light source 101 may be turned off.

DESCRIPTION OF SYMBOLS 100... Sterilizer, 101... First light source, 102... Second light source, 103... Optical filter, 104... Light attenuation part, 104a... Opening part, 105... Housing, 105a... Opening part, 111... Housing, DESCRIPTION OF SYMBOLS 112... Lid part, 121... Electrode block, 122... Excimer lamp, 123... Fixing member, 200... Indoor, 1000... Indoor sterilization system

Claims (11)

A casing and
a first light source that is disposed within the housing and emits ultraviolet rays with a peak wavelength of 222 nm; an optical filter that transmits ultraviolet rays with a wavelength of 222 nm among the ultraviolet rays emitted from the first light source; a first light source section having a light attenuation section that attenuates the emitted ultraviolet rays;
a second light source section disposed within the housing and having a second light source that emits ultraviolet light within a wavelength range of 190 nm to 300 nm,
The first light source unit irradiates a lower space of the vertically divided space with ultraviolet rays emitted from the first light source and passed through the optical filter and the light attenuation unit,
The first light source section further irradiates an upper space of the vertically divided space with ultraviolet rays emitted from the first light source and not passing through at least one of the optical filter and the light attenuation section. ,
The sterilizer is characterized in that the second light source unit irradiates only the upper space with ultraviolet rays emitted from the second light source. The sterilizer according to claim 1, wherein the first light source is always on. The sterilizer according to claim 1 or 2, wherein the light attenuation section is constituted by a plate-like member having a plurality of openings. The first light source is attached to the lower surface of the upper wall of the housing within the housing, and emits ultraviolet rays downward;
The second light source is attached to a side surface of the housing within the housing and emits ultraviolet light in a horizontal direction,
The optical filter and the light attenuation section are arranged at a position facing the surface of the housing to which the first light source is attached,
The sterilizer according to any one of claims 1 to 3 , wherein an opening is formed in a surface of the casing that faces a surface to which the second light source is attached. The sterilizer according to any one of claims 1 to 4 , wherein the first light source is a Kr-Cl excimer lamp. The sterilizer according to claim 1 , wherein the second light source is a low-pressure mercury lamp. The sterilizer according to any one of claims 1 to 5 , wherein the second light source is a Kr-Cl excimer lamp. An indoor sterilization system comprising the sterilization device according to any one of claims 1 to 7 installed above the room. The indoor sterilization system according to claim 8 , wherein the sterilizer is attached to at least one of a ceiling and an upper wall of the room. The indoor sterilization system according to claim 8 or 9 , further comprising an ultraviolet reflector that reflects ultraviolet rays on at least a portion of the wall and floor of the room. The indoor sterilization system according to claim 10 , wherein the ultraviolet reflector is made of fluororesin.

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