Patent Application
20240207470
The present invention relates to an ultraviolet irradiation device, a method for using the ultraviolet irradiation device, and an ultraviolet irradiation method.
It is known that pathogens such as bacteria, fungi, and viruses has an absorption maximum around a wavelength of 260 nm. Therefore, there has been conventionally known a technique of inactivating a pathogen by emitting an object surface or a space where the pathogen is present with ultraviolet light having a high emission spectrum around a wavelength of 254 nm using a low-pressure mercury lamp.
For example, Patent Document 1 describes that a sterilization lamp that emits ultraviolet light is attached to a kitchen or the like to sterilize the kitchen. Further, Patent Document 2 describes an action of sterilization by emitting ultraviolet light to bacteria and viruses floating in a room.
Still further, ultraviolet irradiation devices described in Patent Documents 1 and 2 use ultraviolet light in a wavelength band harmful to a human body. Therefore, measures are taken such as giving directivity to the emitted ultraviolet light so that the ultraviolet light is not directed to the human body.
Patent Document 2: JP-A-2017-018442
However, pathogens such as bacteria, fungi and viruses are present in every part of the space. Pathogens are often contained in airborne droplets released from the mouths or noses of humans and spread through expired air or saliva or by coughing or sneezing, or contained in aerosol. The airborne droplets containing the pathogens adhere to a human body surface (for example, skin and hair) or an object surface with which a person comes into contact (for example, furniture and office equipment). The aerosol containing the pathogens floats and diffuses in the space.
Due to the risk of emitting the harmful ultraviolet light to the human body, the conventional ultraviolet irradiation device emits ultraviolet light only in a direction where people are not present. Therefore, the conventional ultraviolet irradiation device has a limit in inactivation of the pathogens.
The present invention provides an ultraviolet irradiation device that can effectively inactivate pathogens while ensuring safety, a method for using the ultraviolet irradiation device, and an ultraviolet irradiation method.
An ultraviolet irradiation device according to the present invention includes:
By enlarging the light distribution angle of the ultraviolet light by the diverging optical system, the ultraviolet light can be emitted over a wide range. Therefore, the ultraviolet light can be emitted to every corner of the space where the floating pathogens possibly exist. In addition, the cost effect is excellent from the viewpoint that a region where microorganisms are desired to be inactivated can be covered by a small number of ultraviolet irradiation devices.
The ultraviolet light does not present harmfulness to the human body in all wavelength bands. It has been reported that ultraviolet light having a wavelength of 240 nm or more is harmful to human cells and animal cells, but ultraviolet light having a wavelength band shorter than the wavelength band of the above ultraviolet light has a small penetrating force to human cells and animal cells, and therefore has extremely low harmfulness to humans and animals.
The present inventor has made it possible to emit the ultraviolet light in a direction where humans and animal are present by using ultraviolet light having a wavelength of 190 nm or more and less than 240 nm having extremely low harmfulness. This enables inactivation of the pathogens while the safety is ensured. Herein, “inactivation” refers to a concept that includes killing bacteria or viruses or making infectivity or toxicity of bacteria or viruses lost.
A target product covered by the present invention can provide sterilization and virus inactivation performance intrinsic to the ultraviolet light without causing erythema or keratitis on the skin or eyes of humans or animals. In particular, the target product of the present invention has a characteristic that it can be used in a manned environment unlike the conventional ultraviolet light source. By utilizing this feature and installing the target product of the present invention in the indoor or outdoor manned environment, the entire environment can be emitted by the ultraviolet light, and the viruses or bacteria present in the air or on the surface of the member installed in the environment can be suppressed.
This accords with Goal 3 “Ensure healthy lives and promote well-being for all at all ages” included in the Sustainable Development Goals (SDGs) led by the United Nations, and will greatly contribute to the goal target 3.3 “By 2030, end the epidemics of AIDS, tuberculosis, malaria and neglected tropical diseases and combat hepatitis, water-borne diseases and other communicable diseases”.
In a case where the pathogens present on an object surface or in a space are inactivated using the ultraviolet light having a wavelength of 190 nm or more and less than 240 nm, irradiance (light intensity) and an irradiation dose (integrated light quantity) of ultraviolet light to be emitted to the object surface or the space to be a target become factors that determine an effect of inactivation.
For example, American Conference of Governmental Industrial Hygienists (ACGIH) or JIS Z 8812 (Measuring methods of eye-hazardous ultraviolet radiation) specifies that the irradiation dose of ultraviolet light to a human body per day (8 hours) should be equal to or less than a threshold limit value (TLV) dependent on wavelength. As described above, the harmfulness of ultraviolet light having a wavelength of 190 nm or more and less than 240 nm is extremely low, but in order to perform safe operation, it is desirable to limit the irradiance and the irradiation dose of the ultraviolet light emitted per predetermined time so as not to exceed the threshold limit value.
According to intensive research by the present inventors, it has been found that the irradiance of ultraviolet light emitted from the ultraviolet irradiation device is not uniform but exhibits a biased alignment distribution (includes unevenness). Therefore, in setting the operation of the ultraviolet irradiation device in consideration of the TLV, it is necessary to set the upper limit of the irradiation dose (integrated light quantity) of the ultraviolet light in accordance with the region locally receiving a strong light. This causes the irradiation dose of the ultraviolet light in the region locally receiving a weak light to be restricted more than necessary.
According to the present invention, by using the diverging optical system, it is possible to diverge the locally strong light beam to make the alignment distribution of the light intensity uniform. As a result, in setting the operation of the ultraviolet irradiation device in consideration of the TLV, the upper limit of the ultraviolet light irradiation dose is less likely to be restricted. Therefore, by using the diverging optical system, it is possible to ensure safety at a higher level and to be less likely to be restricted by the upper limit of the ultraviolet light irradiation dose.
In order to ensure safety at a higher level, the local maximum irradiance of ultraviolet light (irradiance in a local region to which the most intense light is emitted) may be suppressed by the diverging optical system. For example, the local maximum irradiance of ultraviolet light on a light-emitting surface of the diverging optical system may be suppressed to 3 mW/cm2 or less, and further, 1 mW/cm2 or less.
The diverging optical system has characteristics that attenuation of light is small and emission efficiency is improved. In addition, the diverging optical system can have an optical design aiming at a desired light distribution angle.
An optical filter that transmits the ultraviolet light having the main emission wavelength belonging to the wavelength band from 190 nm to 240 nm and does not substantially transmit the ultraviolet light having the wavelength band from 240 nm to 280 nm may be provided on the incident side of the diverging optical system. This reliably suppresses the ultraviolet light in the wavelength band that possibly affect the human body from leaking to the outside of the housing, and the safety of the irradiation device with respect to the human body is further improved. Furthermore, even in a case where the light distribution angle is reduced using the optical filter, a large light distribution angle can be obtained by disposing the diverging optical system on the emission side of the optical filter.
A separation distance between the optical filter and the diverging optical system may be 0 mm or more and 3 mm or less. The emission light of the optical filter can be effectively incident on the diverging optical system, and the emission efficiency can be enhanced.
The diverging optical system may include a lens array.
The light source may include at least one excimer lamp,
A method for using the ultraviolet irradiation device according to the present invention includes disposing the ultraviolet irradiation device such that at least a part of the emitted ultraviolet light is emitted toward a space, and causing the ultraviolet irradiation device to emit the ultraviolet light.
An ultraviolet irradiation device according to the present invention includes:
An ultraviolet irradiation method according to the present invention includes:
With this configuration, it possible to provide the ultraviolet irradiation device that can effectively inactivate the pathogens while the safety is ensured, the method of using the ultraviolet irradiation device, and the ultraviolet irradiation method.
An ultraviolet irradiation device according to an embodiment is described with reference to the drawings. Note that the following drawings are schematically illustrated, the dimensional ratio in the drawings do not necessarily coincide with the actual dimension ratio, and the dimensional ratios do not necessarily coincide between the drawings.
Hereinafter, each of the drawings is described with reference to an XYZ coordinate system as appropriate. In the XYZ coordinate system, a traveling direction of a light beam of emitted ultraviolet light on an optical axis is defined as the +X direction, and a plane orthogonal to the X direction is defined as a YZ plane. In describing directions in the present description, in a case of distinguishing whether the direction is positive or negative, the positive or negative symbol is added, such as the “+X direction” or the “−X direction”. In a case where there is no need to distinguish between the positive and negative directions, the direction is simply described as the “X direction”. Namely, in the present description, in the case where the direction is simply described as the “X direction”, both “+X direction” and “−X direction” are included. The same applies to the Y direction and the Z direction.
An outline of an embodiment of an ultraviolet irradiation device is described with reference to
An ultraviolet irradiation device 10 of the present embodiment includes excimer lamps 3 that emit ultraviolet light (see
In the present embodiment, the housing 2 includes a first frame 2a having an opening that functions as the extraction part 4 in the center and a second frame 2b having no opening. The second frame 2b and the first frame 2a are fitted to each other to form an internal space surrounded by the housing 2. In this internal space, the excimer lamps 3 and two electrode blocks (9a, 9b) that supplies power to the excimer lamps 3 are disposed. The frame constituting the housing 2 may include three or more frames.
The two electrode blocks (9a, 9b) are fixed to the inner surface of the second frame 2b (see
One embodiment of the light source is described with reference to
In the present embodiment, the excimer lamp 3 that is used is a KrCl excimer lamp having a light-emitting tube filled with a light-emitting gas containing KrCl. Therefore, the excimer lamp 3 emits ultraviolet light having a wavelength of 190 nm to 240 nm. In particular, the KrCl excimer lamp emits ultraviolet light having a main peak wavelength of around 222 nm.
The excimer lamp 3 is not limited to the KrCl excimer lamp. For example, a KrBr excimer lamp may be used which has a light-emitting tube filled with a light-emitting gas containing KrBr. The KrBr excimer lamp emits ultraviolet light having a main peak wavelength of around 207 nm.
In this description, the “main emission wavelength” indicates, in a case where a wavelength range Z(λ) of +10 nm with respect to a certain wavelength λ is defined on an emission spectrum, a wavelength λi in a wavelength range (λi) showing integrated intensity of 40% or more with respect to the total integrated intensity in the emission spectrum. For example, in a light source having an extremely narrow half-value width and showing light intensity only at a specific wavelength such as an excimer lamp in which a light-emitting gas containing KrCl, KrBr, and ArF is sealed, a wavelength having the highest relative irradiance (main peak wavelength) may be usually regarded as the main emission wavelength.
Regarding the size of the light-emitting tube of the excimer lamp 3, a length in the tube axis direction (Y direction) is preferably 15 mm or more and 200 mm or less, and an outer diameter is preferably 2 mm or more and 16 mm or less. The number of excimer lamps 3 may be one, two, or four or more.
The diverging optical system 5 has a function of increasing the light distribution angle of the ultraviolet light passing through the extraction part 4. As can be seen from a light beam flux F1 illustrated in
The enlargement of the light distribution angle of the emitted light is described with reference to
By enlarging the light distribution angle of the ultraviolet light by the diverging optical system 5, the ultraviolet irradiation device 10 can emit the ultraviolet light over a wide range. Further, a locally strong light beam is diverged by the diverging optical system 5 to cause the alignment distribution of the light intensity to be uniform.
Returning to
In the present embodiment, the optical lens constituting the diverging optical system 5 is constituted by a lens array in which a plurality of small lenses (5a, 5b, 5c) is arranged in the Z direction. Each of the small lenses (5a, 5b, 5c) is constituted of a biconcave lens having a cylindrical surface (surface curved in a columnar shape). The longitudinal direction of each of the small lenses (5a, 5b, 5c) (direction in which the cylinder extends) is along the longitudinal direction of the excimer lamp (3a, 3b, 3c). The number of small lenses (5a, 5b, 5c) constituting the lens array is the same as the number of excimer lamps (3a, 3b, 3c). The excimer lamp 3a and the small lens 5a are arranged side by side in the X direction. Similarly, the excimer lamps (3b, 3c) and the small lenses (5b, 5c) are arranged side by side in the X direction. This causes each of the small lenses (5a, 5b, 5c) to effectively diverge the light emitted from each of the excimer lamps (3a, 3b, 3c).
The lens array may be a lens having a configuration in which a plurality of small lenses are arranged in each of the Z direction and the Y direction. In addition, other lens shapes such as a plano-concave lens and a concave meniscus lens may be used as long as the lens has a diverging function. The small lenses constituting the lens array are arranged at an optional pitch. The arrangement pitch of the small lenses is more preferably set to be equal to the arrangement pitch of the excimer lamp.
In the present embodiment, the optical filter 6 is disposed on the incident side of the diverging optical system 5. The optical filter 6 functions as a wavelength selection filter (band pass filter) that transmits ultraviolet light in a specific wavelength band and does not substantially transmit ultraviolet light in a specific wavelength band. The optical filter 6 of the present embodiment transmits the ultraviolet light in a wavelength band of 190 nm or more and less than 240 nm and does not substantially transmit the ultraviolet light in a wavelength band of 240 nm or more and 280 nm or less.
As shown in
From a viewpoint of improvements in the safety to humans or animals, it is preferable that the ultraviolet light emitted from a light source unit be within a wavelength range of 190 nm or more and 237 nm or less, more preferably within a wavelength range of 190 nm or more and 235 nm or less, and particularly preferably within a wavelength range of 190 nm or more and 230 nm or less.
Furthermore, the ultraviolet light having a wavelength of less than 190 nm is absorbed into oxygen in the air, and this results in generation of ozone. In order to more effectively suppress the generation of ozone, it is desirable to use the ultraviolet light having a peak wavelength of 190 nm or more, more preferably 200 nm or more. For example, it is preferable that a peak wavelength of the ultraviolet light emitted from the light source unit be within a wavelength range of 200 nm or more and 237 nm or less, more preferably within a wavelength range of 200 nm or more and 235 nm and less, and further preferably within a wavelength range of 200 nm or more and 230 nm or less.
In the present description, the phrase “does not substantially transmit ultraviolet light” means that the ultraviolet light in a main light beam direction is suppressed to an ultraviolet light intensity of at least 5% or less with respect to an ultraviolet light intensity of a peak wavelength in a specific wavelength band. In the present invention, by using the optical filter 6, the intensity of the ultraviolet light of 240 nm or more and 300 nm or less is shielded to 5% or less with respect to the intensity of the peak wavelength. Note that, regarding the light in a wavelength band desired to be shielded by the optical filter 6, the intensity of the ultraviolet light transmitted through the optical filter 6 is preferably suppressed to 2% or less of the intensity of the peak wavelength. It is more preferable that the intensity of the ultraviolet light transmitted through the optical filter 6 be suppressed to 1% or less with respect to the intensity of the peak wavelength.
The optical filter 6 may have any form as long as the optical filter functions as a band pass filter that does not transmit the ultraviolet light in a specific wavelength band, and the arrangement place and form are not limited. As shown in
The optical filter 6 is formed by, for example, forming a dielectric multilayer film in which dielectric films having different refractive indexes are alternately laminated. Examples of the dielectric multilayer film include a dielectric multilayer film in which hafnium oxide (HfO2) layers and silicon dioxide (SiO2) layers are alternately laminated, and a dielectric multilayer film in which SiO2 layers and aluminum oxide (Al2O3) layers are alternately laminated. The dielectric multilayer film in which the HfO2 layers and the SiO2 layers are alternately laminated can reduce the number of layers for obtaining the same wavelength-selective characteristics as compared to the dielectric multilayer film in which the SiO2 layers and the Al2O3 layers are alternately laminated, and thus can increase the transmittance of the selected ultraviolet light.
As described above, the optical filter 6 is constituted of the plurality of dielectric multilayer films having different refractive indices. However, the optical filter 6 constituted of the dielectric multilayer film has the transmittance inevitably changed depending on the incident angle of the ultraviolet light.
From the graph in
Under such circumstances, the above-described diverging optical system 5 can obtain a particularly remarkable effect in a case where the optical filter 6 that reduces the light distribution angle is used. Furthermore, even in a case where the light distribution angle is reduced by using the optical filter 6, the ultraviolet irradiation device 10 can obtain a large light distribution angle by disposing the diverging optical system 5 on the emission side of the optical filter 6.
A separation distance between the optical filter 6 and the diverging optical system 5 may be 0 mm or more and 3 mm or less. By setting the separation distance within the above range, the emission light of the optical filter 6 can be effectively incident on the diverging optical system 5, and the emission efficiency can be enhanced. The separation distance is represented by the shortest distance between the optical filter 6 and the diverging optical system 5. In the ultraviolet irradiation device 10 illustrated in
A surface 9r (see
The surface 9r may be a curved surface. In particular, by making the surface 9r a parabolic curved surface, the divergence angle from the excimer lamp 3 can be further directed, and the emission efficiency can be enhanced.
Al, an Al alloy, or stainless steel may be used for the electrode blocks (9a, 9b). These materials are conductive and have high reflectance of ultraviolet light.
In the present embodiment, it has been described that a part of the surface constituting the electrode blocks (9a, 9b) having a power feeding function functions as a reflection surface. However, a material having a reflection function different from that of the electrode blocks (9a, 9b) may be disposed on the surface of the electrode blocks (9a, 9b).
A first modification of the ultraviolet irradiation device is described with reference to
A second modification of the ultraviolet irradiation device is described with reference to
As a mode of using the ultraviolet irradiation device according to the present invention, the ultraviolet irradiation device can be disposed so that the emitted ultraviolet light is emitted toward a manned space to allow the ultraviolet irradiation device to emit the ultraviolet light. The manned space means a space that a person can enter regardless of whether or not a person is actually present. The manned space includes, for example, a space in a building such as a house, an office, a school, a hospital, or a theater, or a space in a vehicle such as an automobile, a bus, a train, or an airplane. The ultraviolet irradiation device 10 is disposed on a ceiling, a wall, a column, a floor, or the like facing the manned space so that the extraction part 4 faces the manned space. Then, the ultraviolet irradiation device 10 is turned on to emit the ultraviolet light to the manned space.
In this method for using, as in the related art, it is not necessary to emit the ultraviolet light while avoiding the human body, and it is possible to emit the ultraviolet light without unevenness (with small unevenness) to the entire manned space including the surface (skin or the like) of the human body, the surface of an object with which a human frequently comes in contact, or a space near the human body, which is the essential place where microorganisms should be most inactivated. Therefore, inactivation of microorganisms can be effectively performed.
The ultraviolet irradiation device may be incorporated in a lighting facility such as a fluorescent lamp or a light-emitting diode (LED). In the case where the ultraviolet irradiation device is incorporated in the lighting facility, the diverging optical system 5 used in the ultraviolet irradiation device may be shared with the diverging optical system for visible light used in the lighting facility.
An outline of a second embodiment of an ultraviolet irradiation device is described with reference to
The ultraviolet irradiation device 60 of the present embodiment does not include a diverging optical system 5. Instead, the housing 2 has attachment parts 51 for attaching the diverging optical system 5 so that the diverging optical system 5 can be retrofitted to the ultraviolet irradiation device 60. In the present embodiment, each of the attachment parts 51 is a screw hole. By fitting a screw 52 into the screw hole in a state where a holding frame 53 of the diverging optical system 5 is sandwiched, the diverging optical system 5 is attached to the ultraviolet irradiation device 60. The mode of the attachment part 51 of the diverging optical system 5 is an example, and various modes such as a hook and a hook-and-loop fastener can be applied. By retrofitting the diverging optical system 5 in this manner, the diverging optical system can be replaced with a desired one.
Although the embodiments of the ultraviolet irradiation device and the method for using the ultraviolet irradiation device have been described above, the present invention is not limited to the above-described embodiments at all, and various modifications or improvements can be made to the above-described embodiments without departing from the gist of the present invention.
For example, an example in which the excimer lamp 3 is used as the light source has been described, but a solid-state light source including a laser diode (LD) or an LED may be used as the light source.
For example, as the optical filter, an optical filter that transmits ultraviolet light in a wavelength band of 200 nm to 230 nm and does not substantially transmit a wavelength band of less than 200 nm and 230 nm to 280 nm may be used. By adding a wavelength band of less than 200 nm to the ultraviolet light that is not substantially transmitted, generation of ozone is suppressed, and the safety for the human body is further enhanced.
For an example of the ultraviolet irradiation device illustrated in the above embodiments, the effect of increasing the light distribution angle by using the diverging optical system 5 has been confirmed.
The measurement facility 40 includes the rotary stage 35, the ultraviolet irradiation device 50 placed on the rotary stage 35, and the irradiance meter 31 disposed at a position separated from the ultraviolet irradiation device 50 by a distance d1: 300 (mm). The position of the rotary stage 35 when the ultraviolet irradiation device 10 is arranged to face the irradiance meter 31 so that the irradiance meter 31 is positioned on the optical axis L1 of the ultraviolet irradiation device 50 is defined as an initial position P0. The rotary stage 35 is rotated from the initial position P0 in a rotation direction R illustrated in
An angle θ4 formed between the optical axis L1 of the ultraviolet irradiation device 50 and the light beam L3 incident on the irradiance meter 31 from the ultraviolet irradiation device 50 represents a rotation angle. The irradiance was measured with the irradiance meter 31 while the ultraviolet irradiation device was emitted from the ultraviolet irradiation device 50, and meanwhile, the rotation angle θ4 was increased from the initial position P0 at which the rotation angle θ4 was 0 degrees (deg) (the rotary stage 35 was rotated) until the rotation angle θ4 reached 80 degrees (deg).
The ultraviolet irradiation device 50 has the same structure as the ultraviolet irradiation device 10 illustrated in
As illustrated in
As illustrated in
The optical lens of the lens array used in the diverging optical system 5 of the ultraviolet irradiation device S2 has a larger radius of curvature than the optical lens used in the diverging optical system 5 of the ultraviolet irradiation device S1. That is, a refractive power of the optical lens of the ultraviolet irradiation device S1 is larger than a refractive power of the optical lens of the ultraviolet irradiation device S2.
The ultraviolet irradiation device S3 is an ultraviolet irradiation device without the diverging optical system 5 and is illustrated as a comparative example.
For each of the ultraviolet irradiation devices (S1, S2, S3), the relative irradiance was obtained based on the measured irradiance results. The relative irradiance is obtained by dividing an irradiance measurement value at an arbitrary rotation angle by the irradiance measurement value at a rotation angle of 0 degrees (deg). That is, the relative irradiance is a relative value of the irradiance of the light beam traveling at an arbitrary angle in a case where the irradiance of the light beam traveling in the optical axis direction is 1.
The ultraviolet irradiation devices (S1, S2) included in the diverging optical system 5 exhibit a higher relative irradiance with respect to a wide angle range than the ultraviolet irradiation device S3 without the diverging optical system 5. Regarding the rotation angle at which the relative irradiance is 0.50 (measured irradiance that is half the irradiance at the rotation angle of 0 degrees (on the optical axis)), the ultraviolet irradiation device S1 has an angle of about 44 degrees (deg), the ultraviolet irradiation device S2 has an angle of about 42 degrees, and the ultraviolet irradiation device S3 has an angle of only about 26 degrees. Considering that the light distribution angle is obtained at twice the rotation angle at which the relative irradiance is 0.50, it can be said that the light distribution angle is enlarged by about 36 degrees by providing the diverging optical system in the ultraviolet irradiation device S1, and the light distribution angle is enlarged by about 32 degrees by providing the diverging optical system in the ultraviolet irradiation device S2.
In the above, the example in the presence or absence of the diverging optical system of the lens array has been described, but it is presumed that the same tendency is exhibited also in the ultraviolet irradiation device not including the optical filter or the ultraviolet irradiation device including the diverging optical system including the single lens.
Next, the ultraviolet irradiation device S1 is compared with the ultraviolet irradiation device S2. In the case of the ultraviolet irradiation device S1 including the optical lens having a large refractive power, the relative irradiance of the light beam at an angle of about 15 degrees from the optical axis exceeds the relative irradiance of the light beam on the optical axis by about 0.2 points. On the other hand, in the case of the ultraviolet irradiation device S2 including the optical lens having a small refractive power, there is no light beam in which the relative irradiance of the light beam exceeds 1.1. That is, the ultraviolet irradiation device S2 has a more uniform orientation distribution than the ultraviolet irradiation device S1. Therefore, as described at the beginning, the ultraviolet irradiation device S2 having a more uniform alignment distribution can ensure the safety at a higher level than the ultraviolet irradiation device S1, and is less likely to be restricted by the upper limit of the ultraviolet light emission amount.
By setting the optical lens to have the refractive power within a certain numerical range, the ultraviolet irradiation device can be efficiently used. In the case of the lens array, the radius of curvature is preferably 10 mm or more, and more preferably 13 mm or more from the above-described experimental results. In addition, in order to obtain a sufficient divergence effect, the radius of curvature is more preferably equal to or less than the pitch at which the light sources are arranged.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-077022 | Apr 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/009419 | 3/4/2022 | WO |
