Indoor sterilization device

Abstract

To provide a room sterilizer capable of more surely achieving convergence of an irradiation range while reducing attenuation of light volume.SOLUTION: A room sterilizer of the invention includes a housing, a light source for radiating ultraviolet light disposed on a rear side of the interior of the housing, a main reflector disposed on a back surface of the light source, a plurality of sub-reflectors disposed in front of the light source in the interior of the housing, and an opening disposed in front of the housing. The opening allows output ultraviolet light to be outputted forward. The output ultraviolet light includes at least direct light that is direct ultraviolet light radiated from the light source, first optical axis control light radiated from the light source and then reflected from the main reflector, and second optical axis control light radiated from the light source and then reflected from either one of the plurality of sub-reflectors and further reflected from the main reflector.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an indoor sterilization device installed indoors that can sterilize bacteria and viruses contained in indoor air.

Background Art

[0002] In recent years, the prevalence of various infectious diseases has become a problem. Infectious diseases that spread from a certain region, such as SARS and MERS, and infectious diseases such as the novel coronavirus that hit the world in 2020 have often become problems. In an era of globalization and the great movement of people and goods around the world, such infectious diseases have the problem of spreading around the world without staying in one region.

[0003] Even if an infectious disease based on a certain virus or bacterium converges, there is a problem that an epidemic caused by another virus or bacterium starts. Alternatively, the same virus may mutate, extending the epidemic period or causing a new epidemic. When such an epidemic or spread of an infectious disease occurs, it affects the lifestyles of many people.

[0004] For example, the need to wear masks and disinfect fingers in daily life arises. In addition to these, it is also required to enhance the sense of hygiene.

[0005] The above is an infectious disease related to humans, but even outside of humans, problems with infectious diseases that spread among livestock such as avian influenza and swine influenza often occur. When an infectious disease caused by a virus or bacterium occurs in livestock, it has a great impact on livestock farmers and affects economic activities and people's diets. In addition, when an infectious disease spreads among livestock, there is also a concern that infection from livestock to humans may start due to virus mutation or the like.

[0006] Thus, various infectious disease problems are spreading along with globalization, logistics supply chains, population growth, and improvements in people's living standards. This is true for humans and animals such as livestock, and also for humans and livestock.

[0007] As mentioned above, even with lifestyle changes and hygiene measures such as wearing masks and disinfecting hands, viruses and bacteria exist in various forms in our daily lives and activities. Viruses and bacteria released from the human body can float in the air, as can viruses and bacteria attached to the human body or objects. Viruses and bacteria are also released into the air when a person coughs or sneezes. This leads to the problem of an increase in viruses and bacteria in indoor air.

[0008] Various facilities such as residences, offices, buildings, public facilities, hospitals, nursing homes, and accommodations contain various rooms, and disinfection of viruses and bacteria is necessary within these rooms. These facilities are frequented by multiple people and unspecified visitors. As a result, bacteria and viruses are often brought in from outside through this movement of multiple people. In addition, these facilities are divided into multiple rooms. These rooms are partitioned to a certain size, making it easy for bacteria and viruses that have entered to remain. These residual bacteria and viruses can potentially affect the health of people in the rooms.

[0009] In particular, hospitalized and outpatient patients have weakened immune systems, making them more susceptible to the effects of airborne viruses and bacteria. Furthermore, recent emphasis on hygiene has led many people to develop reduced resistance to bacteria and viruses. In this situation, reducing bacteria and viruses is becoming increasingly necessary in various facilities.

[0010] To kill viruses and bacteria that are attached to or floating in indoor spaces, ultraviolet light is sometimes used to sterilize items and walls in the room. However, irradiating various parts of a room with ultraviolet light is undesirable because it directly exposes people inside the room to it. This is because some types of ultraviolet light can have harmful effects on the human body.

[0011] Furthermore, irradiating an entire room with ultraviolet light raises concerns about creating an imbalance between sterilization and potential harm to the human body. To achieve sterilization beyond this point, the intensity and range of the ultraviolet light would need to be increased, raising concerns about the negative effects of ultraviolet irradiation on the human body.

[0012] As a result, techniques have been proposed to sterilize by narrowing the area irradiated with ultraviolet light (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Japanese Patent Publication No. 2019-205916 [Overview of the project] [Problems that the invention aims to solve]

[0014] Patent Document 1 discloses an indoor sterilization device comprising a housing 2, a mounting part for attaching the housing 2 to an indoor wall, a light source 3 for irradiating ultraviolet light, and a diaphragm member 4 for narrowing the irradiation range of the ultraviolet light emitted by the light source 3.

[0015] Patent Document 1 discloses an indoor sterilization device that narrows the range to which ultraviolet light is irradiated using a diaphragm made of multiple plate materials.

[0016] However, indoor sterilization devices like the one described in Patent Document 1 have the following problems.

[0017] (Problem 1) Ultraviolet light emitted from a light source is emitted in a focused state, after repeatedly colliding with and reflecting off multiple plate materials. As a result, there is a problem that the amount of ultraviolet light emitted decreases as it is absorbed each time it hits a plate material. In other words, there is a problem that a portion of the energy supplied to the light source is wasted. Of course, there is also the problem that the sterilization capacity relative to the energy consumed decreases.

[0018] (Problem 2) Before the light from the light source is finally emitted, it is reflected by each of the plate materials. This repeated reflection results in diffuse reflection, causing the ultraviolet light emitted from the final outlet to spread out. As a result, even when installed high up in a room, ultraviolet light can hit people in the room, leading to problems such as that.

[0019] In other words, conventional technologies such as those described in Patent Document 1 have problems such as low sterilization capacity relative to energy consumption and potential impact on people in the room.

[0020] The present invention aims to solve these problems and provide an indoor sterilization device that can more reliably converge the irradiation range while suppressing light intensity attenuation. [Means for solving the problem]

[0021] In view of the above issues, the indoor sterilization device of the present invention comprises a housing and A light source that emits ultraviolet light is located at the back of the interior of the aforementioned housing, A main reflector is provided on the back of the aforementioned light source, A plurality of sub-reflectors are provided inside the housing and in front of the light source, The housing comprises an opening located at the front, The aforementioned aperture emits output ultraviolet light forward. The output ultraviolet light is at least, Direct light, which is direct ultraviolet light emitted from the aforementioned light source, The first optical axis control light irradiated from the light source and reflected by the main reflector, It includes the second optical axis control light that is irradiated from the light source, reflected by any one of the plurality of sub-reflectors, and then further reflected by the main reflector.

Advantages of the Invention

[0022] The indoor sterilization device of the present invention can irradiate and sterilize bacteria and viruses floating in the room without irradiating ultraviolet rays to people in the room. In particular, in order to prevent irradiation to the human body, by irradiating ultraviolet rays to the upper space in the room above the human body, bacteria and viruses rising by convection are sterilized. By repeatedly sterilizing bacteria and viruses floating near the ceiling due to indoor convection, the bacteria and viruses in the room can be extremely reduced.

[0023] In addition, by using two reflecting parts to converge the irradiation direction, different from the prior art that repeatedly reflects and converges with a slit-shaped plate material, the attenuation of the light amount of ultraviolet rays in the process of convergence can be suppressed. As a result, the balance of the sterilization effect with respect to the energy used can be enhanced.

[0024] In addition, the diffusion of the finally emitted ultraviolet rays due to the diffuse reflection by the plate material of the prior art can be prevented. Thereby, the safety of people in the room can be further enhanced.

Brief Description of the Drawings

[0025] [Figure 1] It is a schematic diagram showing the state of the room where the indoor sterilization device is installed. [Figure 2] It is a side view of the indoor sterilization device in Embodiment 1 of the present invention. [Figure 3] It is a side view of the indoor sterilization device in Embodiment 1 of the present invention. [[ID=3l]] [Figure 4] It is a schematic diagram showing the output state of the output ultraviolet rays by the indoor sterilization device in Embodiment 1 of the present invention. [Figure 5] It is an explanatory diagram showing the irradiation state of the output ultraviolet rays in the room where the indoor sterilization device in Embodiment 1 of the present invention is provided. [Figure 6]This is an explanatory diagram illustrating the problems with conventional techniques that attempt to focus the direction of output ultraviolet light using louvers or slit plates. [Figure 7] This is an explanatory diagram showing that direct light in Embodiment 1 of the present invention constitutes a portion of the output ultraviolet light. [Figure 8] This is an explanatory diagram showing that the first optical axis adjustment light in Embodiment 1 of the present invention constitutes a part of the output ultraviolet light. [Figure 9] This is an explanatory diagram showing that the second optical axis adjustment light in Embodiment 1 of the present invention constitutes a part of the output ultraviolet light. [Figure 10] This is a perspective view of an indoor sterilization device according to Embodiment 1 of the present invention. [Figure 11] This is a perspective view of an indoor sterilization device according to Embodiment 1 of the present invention. [Figure 12] This is an explanatory diagram illustrating the problems with sterilization devices that use slit plates, etc. [Figure 13] This is an explanatory diagram illustrating the problems with sterilization devices that lack slit plates or similar components. [Figure 14] This is a schematic diagram showing a room equipped with an indoor sterilization device according to Embodiment 1 of the present invention. [Figure 15] This is a side view of an indoor sterilization device according to Embodiment 2 of the present invention. [Figure 16] This is an explanatory diagram showing the procedure for measuring ultraviolet intensity. [Modes for carrying out the invention]

[0026] The indoor sterilization device according to the first invention of the present invention comprises a housing and A light source that emits ultraviolet light is located at the back of the interior of the aforementioned housing, A main reflector is provided on the back of the aforementioned light source, A plurality of sub-reflectors are provided inside the housing and in front of the light source, The housing comprises an opening located at the front, The aforementioned aperture emits output ultraviolet light forward. The output ultraviolet light is at least, Direct light, which is direct ultraviolet light emitted from the aforementioned light source, The first optical axis control light irradiated from the light source and reflected by the main reflector, This includes a second optical axis control light that is irradiated from the light source, reflected by one of the plurality of sub-reflectors, and then further reflected by the main reflector.

[0027] This configuration prevents the indoor sterilization device from irradiating the area below where the human body is located with output ultraviolet light, and also reduces diffuse reflection necessary for aligning the optical axis, thereby preventing attenuation of ultraviolet light intensity.

[0028] In the indoor sterilization device according to the second invention of the present invention, in addition to the first invention, the housing is installed in a room at a position higher than the average height of a human being.

[0029] This configuration prevents adverse effects on the human body, even when installed indoors.

[0030] In the indoor sterilization device according to the third invention of the present invention, in addition to the first or second invention, the output ultraviolet light is aligned substantially parallel to and upward along the connecting axis connecting the center of the light source and the center of the opening.

[0031] This configuration prevents the indoor sterilization device from irradiating the area below where a person is located with output ultraviolet light.

[0032] In the indoor sterilization device according to the fourth invention of the present invention, in addition to the third invention, the opening is provided in front of the housing and on the side opposite to the light source, The opening emits the output ultraviolet light forward within the room in which the housing is installed.

[0033] This configuration allows for sterilization by irradiating the room with ultraviolet light.

[0034] In the indoor sterilization device according to the fifth invention of the present invention, in addition to any of the first to fourth inventions, the direct light is ultraviolet light from the light source that directly reaches the opening and is emitted from the opening.

[0035] This configuration allows the output ultraviolet light to include ultraviolet light with virtually no attenuation and in an appropriate optical axis.

[0036] In the indoor sterilization device according to the sixth invention of the present invention, in addition to any of the first to fifth inventions, the first optical axis control light is ultraviolet light from the light source that is reflected toward the opening by the main reflector located on the back of the light source and output from the opening.

[0037] This configuration allows for the inclusion of ultraviolet light with an appropriately aligned optical axis, while significantly reducing attenuation, in the output ultraviolet light.

[0038] In the indoor sterilization device according to the seventh invention of the present invention, in addition to any of the first to sixth inventions, the second optical axis control light is ultraviolet light emitted from the light source that is reflected backward by one of the plurality of sub-reflectors located in front of the light source, and then reflected forward again by the main reflector and output from the aperture.

[0039] This configuration allows for the inclusion of ultraviolet light with an appropriately aligned optical axis, while significantly reducing attenuation, in the output ultraviolet light.

[0040] In the indoor sterilization device according to the eighth invention of the present invention, in addition to any of the first to seventh inventions, the output ultraviolet light is The system further includes a third optical axis control light, which is ultraviolet light emitted from the light source that is reflected forward by the main reflector, reflected backward by one of the plurality of sub-reflectors, and further reflected forward by the main reflector and output from the aperture.

[0041] This configuration allows a larger amount of ultraviolet light emitted from the light source to be converted into output ultraviolet light without being wasted.

[0042] In the indoor sterilization device according to the ninth invention of the present invention, in addition to the third invention, the plurality of sub-reflectors include an opening sub-reflector provided below the opening, The aforementioned aperture sub-reflector has a height that reaches the connecting shaft.

[0043] This configuration reliably prevents the output of ultraviolet rays in the downward vector direction, thus preventing any adverse effects on the human body.

[0044] In the indoor sterilization device according to the tenth invention of the present invention, in addition to the ninth invention, the auxiliary reflector at the opening prevents ultraviolet rays from leaking downward from the connecting shaft.

[0045] This configuration prevents adverse effects on the human body.

[0046] In the indoor sterilization device according to the 11th invention of the present invention, in addition to any of the first to tenth inventions, the plurality of sub-reflectors are arranged in a row inside the housing.

[0047] This configuration ensures that ultraviolet light from various directions emitted from the light source is evenly reflected towards the main reflector at an appropriate angle. In addition, after reflection by the main reflector, the light is controlled to be approximately parallel or upward along the optical axis. The reflection angles of each of the sub-reflectors may differ among the multiple sub-reflectors. This difference ensures that ultraviolet light from different angles of the light source is reliably reflected towards the main reflector. Furthermore, the combination of the position and angle at which the light strikes the main reflector adjusts the second optical axis adjustment light to be approximately parallel or upward along the connecting axis.

[0048] In the indoor sterilization device according to the twelfth invention of the present invention, in addition to any of the first to eleventh inventions, the main reflector has at least one of a planar shape, a bent shape, and a concave shape.

[0049] This configuration allows for the creation of first and second optical axis aligning beams that are approximately parallel or upward-facing as output ultraviolet light.

[0050] In the indoor sterilization device according to the 13th invention of the present invention, in addition to any of the first to 12th inventions, the second optical axis control light is The reflection angle at which the light from the light source is reflected by the sub-reflector, The reflection angle at which the light reflected by the sub-reflector is reflected by the main reflector, The combination of these elements ensures that the opening is contained within the opening range of the aforementioned opening.

[0051] With this configuration, the second optical axis adjustment light is not output downwards.

[0052] In the indoor sterilization device according to the 14th invention of the present invention, in addition to any of the first to 13th inventions, the output ultraviolet light is capable of sterilizing the air in its irradiated area.

[0053] This configuration helps maintain cleanliness in the room.

[0054] In addition to the 14th invention, the indoor sterilization device according to the 15th invention of the present invention further comprises a stirrer for agitating the air between the irradiation area and the other areas in the room where the housing is installed.

[0055] This configuration makes it easier to disinfect the entire room.

[0056] Embodiments of the present invention will be described below with reference to the drawings.

[0057] (Embodiment)

[0058] (Analysis by the inventor) Figure 1 is a schematic diagram showing the state of a room with an indoor sterilization device installed. Figure 1 shows a side view of room 100, showing the interior of room 100 as visible. There are 300 people inside room 100. If room 100 is an office, then 300 people are employees or visitors. Alternatively, if room 100 is a public facility, then 300 people are visitors or staff.

[0059] Inside room 100, there are 30 bacteria and viruses (hereinafter referred to as "bacteria, etc."). These bacteria, etc. 30 are suspended in the air by the air currents generated inside room 100. Through this suspension, the bacteria, etc. 30 fill various places inside room 100.

[0060] The indoor sterilization device 1 is installed on the wall 110 of room 100. The indoor sterilization device 1 emits ultraviolet light, as described later. This ultraviolet light irradiates bacteria, etc. 30, thereby sterilizing them. In this case, when the indoor sterilization device 1 is installed on the wall 110 as shown in Figure 1, the indoor sterilization device 1 emits ultraviolet light in the opposite direction from the wall 110. Bacteria, etc. 30 can be sterilized within this irradiation range.

[0061] (1) Avoiding irradiation of the human body Room 100 often contains 300 people. As described above, depending on the characteristics of Room 100, various types of people 300 may be present, such as employees, visitors, staff, and inpatients. The indoor sterilization device 1 sterilizes bacteria 30 by irradiating them with ultraviolet light. However, prolonged exposure of people 300 to this ultraviolet light can be undesirable, causing skin problems and other issues. Therefore, when the indoor sterilization device 1 is installed indoors and irradiates with ultraviolet light, it is necessary to avoid irradiating people 300 inside Room 100 with ultraviolet light.

[0062] (2) Suppression of the attenuation of ultraviolet light intensity In room 100, bacteria 30 can be sterilized by ultraviolet irradiation from the indoor sterilization device 1. It is important that the attenuation of the ultraviolet intensity ultimately emitted from the light source is minimal.

[0063] Minimizing the attenuation of ultraviolet (UV) intensity has the advantage of reducing the energy consumed by the light source. Alternatively, minimizing the attenuation of UV intensity ultimately emitted from the light source is necessary to ensure germicidal capabilities.

[0064] As explained in the section on conventional technology, in sterilization devices that restrict the direction of ultraviolet light or irradiation downwards where people are located using louvers or slit plates, ultraviolet light is absorbed by the louvers or slit plates. As a result, the intensity of ultraviolet light ultimately emitted from the light source is attenuated, leading to a problem of reduced sterilization capacity. Alternatively, in order to ensure sterilization capacity, the energy consumption of the light source must be increased. This is undesirable from the standpoint of energy conservation and environmental impact.

[0065] This invention is based on such analysis.

[0066] (Overview) Figures 2 and 3 are side views of an indoor sterilization device according to Embodiment 1 of the present invention. Figures 2 and 3 are shown in a transparent view to show the internal structure of the indoor sterilization device 1. The indoor sterilization device 1 comprises a housing 2, a light source 3, a main reflector 4, a secondary reflector 5, and an opening 6.

[0067] The housing 2 forms the outer shape of the indoor sterilization device 1 and is the main body that houses the necessary elements. The housing 2 may be made of metal, resin, alloy, or other material. It may also be provided with mounting parts so that the housing 2 can be attached to the wall 110. Furthermore, as shown in Figure 2, the housing 2 is attached to the wall 110 and irradiates ultraviolet light, so it is preferable that it has an outer shape that matches this.

[0068] The light source 3 is located inside the housing 2. As shown in Figure 2, the light source 3 is located at the rear 21 of the housing 2. The rear 21 is the side facing the wall 110 to which it is mounted. The light source 3 emits ultraviolet light. In other words, the light source 3 is the element that emits actual ultraviolet light. The ultraviolet light emitted from the light source 3 is ultimately output from the opening 6 as output ultraviolet light 200.

[0069] The main reflector 4 is located on the back of the light source 3. Figures 2 and 3 show the main reflector 4 located on the back of the light source 3. The main reflector has a reflective function and can reflect ultraviolet light that reaches it. This reflection is based on the reflection angle of the main reflector 4 at the point where the ultraviolet light reaches.

[0070] Multiple sub-reflectors 5 are located inside the housing 2. They are also located in front of the light source 3. That is, the positional relationship inside the housing 2, from the rear 21, is the main reflector 4, the light source 3, and the sub-reflectors 5. Since there are multiple sub-reflectors 5, they are arranged inside the housing 2 as shown in Figures 2 and 3. Furthermore, the sub-reflectors 5 are located both above and below the housing 2.

[0071] Each of the multiple sub-reflectors 5 can also reflect the incoming ultraviolet light. At the position where the ultraviolet light arrives, the reflection is performed at a reflection angle corresponding to the angle of the sub-reflector 5 and the angle of the ultraviolet light.

[0072] The opening 6 is located at the front 22 of the housing 2 and actually emits ultraviolet light to the outside. Here, the ultraviolet light emitted by the opening 6 is the output ultraviolet light. Figure 3 shows the output ultraviolet light 200. In other words, the indoor sterilization device 1 emits this output ultraviolet light 200 from the opening 6 as the actual ultraviolet light that sterilizes the room. This output ultraviolet light 200 sterilizes bacteria and other organisms present in the area irradiated with ultraviolet light.

[0073] The opening 6 is located at the front of the housing 2, on the side opposite the light source 3. The opening 6 emits output ultraviolet 200 when placed in the room in which the housing 2 is installed, and directed forward.

[0074] Here, output ultraviolet 200 includes at least the following ultraviolet rays (1) to (3).

[0075] (1) Direct light, which is ultraviolet light directly emitted from light source 3. Direct light is the ultraviolet light emitted from light source 3 that directly reaches aperture 6 and is then emitted from aperture 6.

[0076] (2) First optical axis control light irradiated from light source 3 and reflected by main reflector 4. The first optical axis control light is ultraviolet light emitted from the light source 3 that is directed towards the back of the light source 3, reflected by the main reflector 4 located on the back towards the aperture 6, and output from the aperture 6.

[0077] (3) Second optical axis control light that is irradiated from the light source 3, reflected by one of the multiple sub-reflectors 5, and then reflected again by the main reflector. The second optical axis control light is ultraviolet light emitted from the light source 3 that is reflected backward by one of the multiple sub-reflectors 5 located in front of the light source 3, and then reflected forward by the main reflector 4 and output directly from the aperture 6.

[0078] The output ultraviolet light 200 ultimately emitted from the aperture 6 includes at least this direct light, the first optical axis controlled light, and the second optical axis controlled light. With this structure, the output ultraviolet light 200 emitted from the aperture 6 toward the room is as shown in Figure 4. That is, the output ultraviolet light 200 is approximately parallel to and along the connecting axis connecting the center of the light source 3 and the center of the aperture 6.

[0079] Figure 4 is a schematic diagram showing the output state of ultraviolet light from the indoor sterilization device in Embodiment 1 of the present invention. Figure 4 shows the indoor sterilization device 1 viewed from the side, with the output ultraviolet light 200, including the ultraviolet light described in (1) to (3) above, being emitted from the internal light source 3. As shown in Figure 4, the output ultraviolet light 200 is emitted bidirectionally in the direction of the connection axis and upward when viewed from the opening 6. In other words, when installed in a room 100 as shown in Figure 1, the output ultraviolet light 200 does not hit a person 300 below. This ensures safety.

[0080] Furthermore, the housing 2 is placed in a room and installed at a position higher than the average human height, as shown in Figure 1. It is similar to an air conditioner installed in a room. As a result, as shown in Figure 4, the indoor sterilization device 1 can irradiate output ultraviolet light 200 in a way that does not hit the people 300 in the room 100. Consequently, in a room where the indoor sterilization device 1 is installed, an appropriate irradiation area can be achieved while avoiding irradiation of people 300, as shown in Figure 5.

[0081] This irradiation can kill bacteria and other microorganisms present in the irradiated area. In a room, air circulates and convects, causing bacteria and other microorganisms to rise upwards. This allows them to enter the irradiated area. By irradiating this area with UV 200 output, bacteria and other microorganisms in the room are killed, keeping the room clean and hygienic.

[0082] In particular, it is suitable for preventing infectious diseases such as the coronavirus, which has become a problem in recent years.

[0083] (Summary of advantages over conventional technology) Furthermore, as shown in Figures 3 and 4, within the housing 2, ultraviolet light reflected by the main reflector 4 and the sub-reflector 5 constitutes part of the output ultraviolet light 200. Therefore, unlike conventional technologies where light is diffusely reflected by louvers or slit plates, when outputting ultraviolet light, leakage downwards due to diffuse reflection is prevented. With louvers or slit plates, the light is reflected repeatedly by the louvers or slit plates before being output from the light source and converged, but some of the reflected ultraviolet light leaks downwards. This is as shown in Figure 6.

[0084] Figure 6 is an explanatory diagram illustrating the problems with conventional techniques that attempt to focus the output direction of ultraviolet light using louvers or slit plates.

[0085] As shown in Figure 6, ultraviolet light from the light source repeatedly collides with and reflects off each of the louvers and slit plates, ultimately being emitted as output ultraviolet light. At this time, the ultraviolet light irradiated from the light source is repeatedly reflected off multiple louvers and slit plates, and eventually the direction of the output converges.

[0086] However, as shown in Figure 6, there are two problems.

[0087] Problem 1) Repeated reflection causes diffuse reflection, and some of the reflected ultraviolet light is emitted downwards. When emitted downwards, it can lead to the problem of ultraviolet light irradiating people in the room. Also, if it is emitted too high, the ultraviolet light may be directed towards the ceiling. In this case, the germicidal effect will also be reduced.

[0088] In other words, conventional techniques, as shown in Figure 6, have the problem of not being able to achieve an appropriate irradiation direction.

[0089] Problem 2) Each time the UV light hits a louver or slit plate, it is absorbed, and the UV light is attenuated. As a result, the intensity of the output UV light ultimately decreases, leading to a decrease in germicidal capacity or an increase in energy consumption by the light source.

[0090] In contrast, as shown in Figures 3 and 4, the indoor sterilization device of the present invention controls the output direction by appropriate control (and combination) of the reflection angles of the main reflector 4 and the sub-reflector 5. Therefore, reflection in the direction of movement in the output direction (as in the conventional technology shown in Figure 6) does not occur. Therefore, diffuse reflection does not occur. Since it is composed of direct light, first optical axis adjustment light, and second optical axis firing light, the output direction of the output ultraviolet light 200 output from the aperture 6 is not downward and does not hit the human body. Nor is it prevented from being abnormally upward and resulting in insufficient irradiation for sterilization.

[0091] These are adjusted by the position, angle, and shape of the main reflector 4 and the secondary reflector 5, including their relative relationship to the light source 3.

[0092] In addition, the direct light remains unchanged, the first optical axis adjustment light undergoes only one reflection, and the second optical axis adjustment light undergoes only two reflections, resulting in extremely little attenuation due to absorption. Therefore, the decrease in sterilization capacity or the increase in energy consumption of the light source, which occur in conventional technologies, are prevented.

[0093] Thus, the indoor sterilization device 1 of the present invention solves problems 1 and 2 of the conventional technology, which attempts to focus the output direction using louvers or slit plates. As will be described in detail later, the inventor's experiments confirmed that, with the same light source energy, the intensity of the output ultraviolet light at a distance of 1m from the main unit is improved by 27% compared to the conventional technology. Of course, it was also confirmed that no human exposure occurs.

[0094] (Details on the elements that make up the output ultraviolet light) The output UV 200 includes at least direct light, first-axis tuner light, and second-axis tuner light. Details of each are described below.

[0095] (1) Direct light Figure 7 is an explanatory diagram showing that direct light in Embodiment 1 of the present invention constitutes part of the output ultraviolet light. The inside of the housing 2 is shown as visible. The light source 3 emits ultraviolet light. For example, if the light source 3 is cylindrical, it emits ultraviolet light radially around the outer circumference of the cylinder.

[0096] Of the emitted ultraviolet light, some reaches the aperture 6 directly from the light source 3. This ultraviolet light does not hit the main reflector 4 or the sub-reflector 5, but is emitted from the light source 3 and directly output from the aperture 6. This is the direct light 210.

[0097] The direct light 210 thus constitutes part of the output ultraviolet light 200.

[0098] Furthermore, the aperture 6 is positioned, angled, and sized to be approximately parallel to or above the connection axis. Therefore, direct light 210 does not emit downwards or abnormally upwards. Consequently, the direct light 210 is contained within the output range of the irradiation area shown in Figure 5, which is approximately parallel to or above the connection axis.

[0099] (2) First optical axis adjustment light Figure 8 is an explanatory diagram showing that the first optical axis adjustment light in Embodiment 1 of the present invention constitutes a part of the output ultraviolet light. The light source 3 emits ultraviolet light radially. A portion of this emitted ultraviolet light is directed toward the back of the light source 3, as shown in Figure 8. A main reflector 4 is provided on the back. Therefore, the ultraviolet light emitted toward the back is reflected by the main reflector 4.

[0100] The main reflector has a reflection angle that reflects ultraviolet light irradiated on its back surface so that it is forward and aligns with the position of the aperture 6. This means that it has an appropriate reflection angle corresponding to the position where the ultraviolet light is irradiated. As a result, the ultraviolet light irradiated on the back surface and reaching the main reflector 4 is reflected to a position aligned with the aperture 6.

[0101] The ultraviolet light reflected by the main reflector 4 and output from the aperture 6 is the first optical axis adjustment light 220. This first optical axis adjustment light 220 constitutes a part of the output ultraviolet light 200. The first optical axis adjustment light 220 has an angle in the main reflector 4 that is approximately parallel to or above the connecting axis. As a result, as shown in Figure 5, the output ultraviolet light 200 is output at an angle that is approximately parallel to or above the connecting axis. Figure 5 is an explanatory diagram showing the irradiation state of output ultraviolet light in a room equipped with the indoor sterilization device according to Embodiment 1 of the present invention.

[0102] (3)Second optical axis adjustment light Figure 9 is an explanatory diagram showing that the second optical axis adjustment light in Embodiment 1 of the present invention constitutes a portion of the output ultraviolet light. The light source 3 irradiates ultraviolet light radially. A portion of this irradiated ultraviolet light is directed downward and upward in front of the light source.

[0103] Without the sub-reflectors 5, the ultraviolet light irradiated in the forward, downward, and upward directions would ultimately be emitted in various directions. However, the indoor sterilization device 1 of the present invention has multiple sub-reflectors 5 inside its housing 2. In other words, each of the ultraviolet rays irradiated in the forward, downward, and upward directions strikes one of the multiple sub-reflectors 5 and is reflected.

[0104] The sub-reflectors 5 have a reflective surface facing backward, as shown in Figure 9. As a result, each of the sub-reflectors 5 reflects ultraviolet light backward (towards the rear side 21). The ultraviolet light reflected backward reaches the main reflector 4. The main reflector 4 reflects this received ultraviolet light forward.

[0105] Here, the main reflector 4 has an angle such that it reflects ultraviolet light that reaches it approximately parallel to or upward along the connecting axis. Therefore, the ultraviolet light reflected by the main reflector 4 is reflected forward and output from the aperture 6. This is the second optical axis adjustment light 230.

[0106] Thus, even ultraviolet light irradiated forward from the light source 3 but not directly reaching the aperture 6 can be output from the aperture 6 through reflection by the sub-reflector 5 and the main reflector 4. At this time, the output is in a direction approximately parallel to or above the connection axis. As a result, the second optical axis adjustment light 230 is also output in a direction approximately parallel to or above the connection axis, as shown in Figure 4. This constitutes the output ultraviolet light 200.

[0107] In this way, the direct light 210, the first optical axis adjustment light 220, and the second optical axis adjustment light 230 constitute the output ultraviolet light 200. As a result, the ultraviolet light irradiated from the light source 3 is output from the aperture 6 without being wasted. Furthermore, since it only passes through reflection by the main reflector 4 and the sub-reflector 5, there is little attenuation due to absorption. Consequently, the attenuation of the ultraviolet intensity of the output ultraviolet light 200 can be greatly suppressed relative to the energy consumed by the light source 3.

[0108] As a result, improved sterilization capabilities and reduced energy consumption can be achieved.

[0109] Furthermore, the first optical axis adjustment light 220 and the second optical axis adjustment light 230, which involve reflection, also fall within the aperture range of the aperture 6, depending on the reflection angle of the main reflector 4 and the reflection angle of the sub-reflector 5, or a combination thereof. In addition, they are aligned in a direction that is approximately parallel to or above the connecting axis. In particular, each of the multiple sub-reflectors 5 is arranged in a row inside the housing 2. As a result, each of the ultraviolet rays from the light source 3 is reflected by one of the sub-reflectors 5. These reflected ultraviolet rays are finally reflected by the main reflector 4 to become the second optical axis adjustment light 230.

[0110] As a result, the output ultraviolet light 200 emitted from the aperture 6 is approximately parallel to or above the connection axis. This makes it possible to achieve an irradiation range that does not hit the human body, as shown in Figure 4. Sterilization and other processes can be performed within this irradiation range.

[0111] (Explanation with detailed diagrams) The indoor sterilization device 1 will be explained with more detailed drawings. Figure 10 is a perspective view of the indoor sterilization device in Embodiment 1 of the present invention. Figure 10 shows the internal configuration.

[0112] This is a more detailed drawing that more closely reflects the actual form, building upon the explanations given using Figure 2 and other diagrams.

[0113] As shown in Figure 10, the indoor sterilization device 1 comprises a housing 2. The housing 2 can be mounted on a wall by a mounting part 25. This allows it to be mounted at a position higher than the human body.

[0114] The housing 2 contains a light source 3, a main reflector 4, and multiple sub-reflectors 5. An opening 6 is also provided at the front. Output ultraviolet light 200 is emitted from this opening 6. As described above, the output ultraviolet light 200 includes direct light, first optical axis adjustment light, and second optical axis adjustment light.

[0115] These are created by reflection from the main reflector 4 and sub-reflector 5 shown in Figure 10, and are output from the aperture 6.

[0116] Here, as shown in Figure 10, the main reflector may have a planar shape. Alternatively, it may have a shape that includes at least one of a bent shape and a concave shape. In other words, it is also preferable that the main reflector 4 has at least one of a planar shape, a bent shape and a concave shape.

[0117] The secondary reflector 5 may be a plate member with an angled surface, as shown in Figure 10, with a reflective surface on its surface. The main reflector 4 is similar. The reflective surface can be achieved by plating (sputtering) or paint. With a structure like that shown in Figure 10, the indoor sterilization device 1 can be mounted on a wall while having all the necessary elements. Of course, the actual housing 2 covers the inside except for the opening 6.

[0118] Furthermore, multiple sub-reflectors 5 are arranged in a row inside the housing 2. Because each has a different angle and size, each of the ultraviolet rays emitted forward from the light source 3 can be reflected backward (towards the main reflector 4) at the appropriate angle without any leakage. This allows the second optical axis adjustment light to be generated at the appropriate angle. It also reduces the waste of ultraviolet rays from the light source 3 that would otherwise be lost.

[0119] Figure 11 is a perspective view of an indoor sterilization device according to Embodiment 1 of the present invention. Figure 11 shows the internal configuration. Reference numerals are omitted for elements that overlap with those in Figure 10.

[0120] In the indoor sterilization device 1 shown in Figure 11, the main reflector 4 has a concave shape. The concave shape makes it more reliable to reflect ultraviolet light in a direction that is approximately parallel to or above the connecting axis.

[0121] The indoor sterilization device 1 shown in Figure 11 also includes a light source 3, a main reflector 4, multiple sub-reflectors 5, and an opening 6. It also includes a control unit and power supply for controlling the light source 3 and other components (these are the same in other drawings).

[0122] With this configuration, the indoor sterilization device 1 can irradiate with an appropriate output of ultraviolet light 200 by reducing the attenuation of ultraviolet light intensity and preventing downward irradiation to avoid hitting the human body. As a result, bacteria and other microorganisms in the irradiated area can be sterilized, and a hygienic indoor environment can be maintained.

[0123] (Comparison of irradiation range with conventional technology) As explained in Figures 4 and 5 above, the indoor sterilization device 1 of the present invention can prevent downward leakage of ultraviolet output towards the human body while suppressing the attenuation of ultraviolet intensity.

[0124] In contrast, conventional technology has problems such as attenuation of ultraviolet intensity and leakage of ultraviolet light downwards (towards the human body), as shown in Figures 12 and 13. Figure 12 is an explanatory diagram illustrating the problems of a sterilization device that uses slit plates, etc. Figure 13 is an explanatory diagram illustrating the problems of a sterilization device that does not use slit plates, etc.

[0125] When louvers or slit plates are provided as shown in Figure 12, the intensity of ultraviolet light is attenuated due to absorption by the slit plates, etc., and leakage downward occurs. In the configuration without any such features as shown in Figure 13, attenuation is suppressed, but the light is emitted downward, causing adverse effects on the human body.

[0126] The indoor sterilization device 1 of the present invention solves these problems of the conventional technology all at once and can achieve sufficient sterilization capacity.

[0127] In this case, ultraviolet light of a wavelength suitable for the type of bacteria or virus should be used, such as UV-A, UV-B, or UV-C. Of course, other ultraviolet light wavelengths suitable for sterilization may also be used.

[0128] (Embodiment 2)

[0129] Next, Embodiment 2 will be described. Various improvements will be described in Embodiment 2.

[0130] (3rd optical axis adjustment light) The output ultraviolet light may also preferably further include a third optical axis adjustment light, as follows:

[0131] Of the ultraviolet light emitted from the light source 3, the light directed towards the back is reflected forward by the main reflector 4. Next, this forward-reflected ultraviolet light is reflected backward by one of the sub-reflectors 5. Furthermore, it is reflected forward by the main reflector 4 and reaches the aperture 6. It is oriented approximately parallel to or upward with respect to the connecting axis.

[0132] This is the third optical axis adjustment light.

[0133] Depending on the shape, size, position, angle, and relative relationship with the light source 3 of the main reflector 4 and the sub-reflector 5, the process may not end with the first optical axis adjustment light. In this case, such a third optical axis adjustment light is generated. It is also preferable that the output ultraviolet light 200 further includes this third optical axis adjustment light.

[0134] In this way, the waste of ultraviolet light emitted from light source 3 can be further reduced. This allows for reduced energy consumption and improved sterilization capabilities.

[0135] (Agitator)

[0136] Figure 14 is a schematic diagram showing a room equipped with the indoor sterilization device according to Embodiment 1 of the present invention. The room in which the housing 2 is installed is further equipped with a stirrer 8 for agitating the air in the irradiation area and the surrounding areas.

[0137] A stirrer is placed in a room to create convection in the air.

[0138] This convection makes it easier for bacteria and other particles in the room to move to the irradiated area. Furthermore, because it's a circulating convection, the particles are constantly being replaced as they move. This allows for more reliable and effective sterilization of bacteria and other particles in the room.

[0139] The agitator 8 widely circulates the air in the room. This moves bacteria from various locations in the room to the irradiated area. The moved bacteria are then sterilized by the ultraviolet light output of 200. The sterilized air then moves downward again due to convection. This circulation maintains the hygienic condition of the room.

[0140] (Aperture sub-reflector)

[0141] Figure 15 is a side view of an indoor sterilization device in Embodiment 2 of the present invention. The plurality of sub-reflectors 5 include an opening sub-reflector 51 located below the opening 6. The opening sub-reflector 51 has a height that reaches the connecting axis. Figure 15 shows a configuration in which the opening sub-reflector 51 reaches the connecting axis.

[0142] This configuration allows the aperture sub-reflector 51 to prevent the output (leakage) of ultraviolet 200 downward from the connecting axis.

[0143] As described above, the reflection angles of the main reflector 4 and the sub-reflector 5, and their combination, cause the first and second optical axis adjustment beams to be approximately parallel to or above the connection axis. However, some direct light and some other ultraviolet light may be directed downward from the connection axis. The aperture sub-reflector 51 can reliably prevent the output (leakage) of such downward-directed ultraviolet light from the aperture 6.

[0144] As a result, reliable output that does not go below the output ultraviolet 200, as shown in Figures 4 and 5, can be achieved. Of course, the aperture sub-reflector 51 also has reflective capabilities, so a second optical axis control light is generated through it, and this also becomes part of the output ultraviolet 200.

[0145] In this way, the aperture sub-reflector 51 can further enhance safety.

[0146] (Embodiment 3)

[0147] In Embodiment 3, experimental results demonstrating that the ultraviolet intensity output of the indoor sterilization device of the present invention is higher than that of the prior art will be explained.

[0148] (Experiment to measure output ultraviolet light) The inventors measured the irradiation intensity of the output ultraviolet light actually emitted using an indoor sterilization device having a slit plate as shown in Figure 12 and the indoor sterilization device of the present invention.

[0149] (Measurement method) In a conventional indoor sterilization device (a slit plate installed in a room under the same conditions) and the indoor sterilization device 1 of the present invention (the indoor sterilization device of the present invention), the intensity of horizontally irradiated ultraviolet light was measured at a distance of 1 m from the device.

[0150] At this time, the ultraviolet irradiation energy from the light source was kept the same.

[0151] (Measurement standards)

[0152] The ultraviolet intensity was measured 1 meter in front of the sterilization device using a Delta Ohm ultraviolet intensity meter (illuminance, luminance, and radiation irradiance meter and LP471UVC probe). The specifications of this ultraviolet intensity meter are irradiance of 220-280 nm (peak 260 nm).

[0153] Figure 16 shows the measurement configuration. Figure 16 is an explanatory diagram illustrating the ultraviolet intensity measurement experiment.

[0154] (Measurement results) The measurement results are as follows: The ultraviolet intensity values ​​at a distance of 1 meter are shown for both a conventional indoor sterilization device and the indoor sterilization device of the present invention.

[0155] Conventional indoor sterilization device: 33.0 μW / cm2 Indoor sterilization device of the present invention: 41.9 μW / cm2 Improved performance of the present invention: 27.0% improvement

[0156] This resulted in a 27% improvement. In other words, this improvement corresponds to an improvement in sterilization capacity. Conversely, for the same sterilization capacity, the energy consumption required by the light source can be reduced by 27%. In other words, energy savings can be achieved.

[0157] Thus, experiments have confirmed that the attenuation due to light absorption by the slit member, as in conventional technology, has been resolved, resulting in improved sterilization capacity and energy savings. Furthermore, the inventors have confirmed that the downward leakage of ultraviolet light from the indoor sterilization device of the present invention is 0.0 μW / cm². 2 It was also confirmed that this is the case. This is the safety standard of 0.2 μW / cm². 2 This is the result of clearing that condition.

[0158] The indoor sterilization devices described in Embodiments 1 to 3 are examples illustrating the spirit of the present invention and may include modifications and alterations that do not depart from the spirit of the present invention. [Explanation of Symbols]

[0159] 1 Indoor sterilizer 2 cabinets 21 Back side 22 forward 3 light source 4 Main reflector 5 Secondary reflector 51 Aperture sub-reflector 6 openings 8. Agitator 100 rooms 110 Wall 200 Output UV 210 direct light 220 1st optical axis adjustment light 230 2nd optical axis adjustment light 300 people

Claims

1. The housing and a light source provided at the back of the housing for irradiating ultraviolet light; a main reflector provided on the back surface of the light source; A plurality of sub-reflectors provided inside the housing and in front of the light source; an opening provided in the front of the housing, The opening outputs ultraviolet light forward, The output ultraviolet light includes at least direct light, which is ultraviolet light emitted directly from the light source; a first optical axis control light emitted from the light source and reflected by the main reflecting mirror; An indoor sterilization device including a second optical axis control light that is irradiated from the light source, reflected by any one of the plurality of sub-reflectors, and then further reflected by the main reflector.

2. The room sterilizer according to claim 1 , wherein the housing is mounted at a position higher than the average height of a person in the room.

3. 3. The room sterilization device according to claim 1, wherein the output ultraviolet light is directed upward and substantially parallel to a connecting axis connecting the center of the light source and the center of the opening.

4. the opening is provided at the front of the housing and on the opposite side to the light source, The indoor sterilization device according to claim 3 , wherein the opening emits the output ultraviolet light forward in the room in which the housing is installed.

5. The room sterilization device according to any one of claims 1 to 4, wherein the direct light is ultraviolet light emitted from the light source that directly reaches the opening from the light source and is output from the opening.

6. 6. The indoor sterilization device according to claim 1, wherein the first optical axis control light is ultraviolet light emitted from the light source, reflected by the main reflecting mirror on the back surface of the light source toward the opening, and output from the opening.

7. 7. The indoor sterilization device according to claim 1, wherein the second optical axis control light is ultraviolet light irradiated from the light source, reflected backward by one of the plurality of secondary reflectors in front of the light source, and then reflected forward again by the main reflector, and output from the opening.

8. The output ultraviolet light is 8. The indoor sterilization device according to claim 1, further comprising a third optical axis control light, which is ultraviolet light emitted from the light source, reflected forward by the main reflecting mirror, reflected backward by any of the plurality of sub-reflecting mirrors, and further reflected forward by the main reflecting mirror and output from the opening.

9. The plurality of sub-reflectors includes an opening sub-reflector provided below the opening, The room sterilizer according to claim 3 , wherein the opening sub-reflector has a height that reaches the connecting shaft.

10. The indoor sterilizer according to claim 9, wherein the opening sub-reflector prevents ultraviolet light from leaking below the connecting shaft.

11. The room sterilizer according to claim 1 , wherein the plurality of secondary reflecting mirrors are arranged in a row inside the housing.

12. 12. The indoor sterilizer according to claim 1, wherein the main reflecting mirror has at least one of a flat shape, a curved shape, and a concave shape.

13. The second optical axis control light is the reflection angle at which light from the light source is reflected by the subreflector; The reflection angle at which the light reflected by the sub-reflector is reflected by the main reflector; The indoor sterilization device according to any one of claims 1 to 12, wherein the combination of the above fits within the opening range of the opening.

14. 14. The room sterilization device according to claim 1, wherein the output ultraviolet light is capable of sterilizing air in its irradiation area.

15. The indoor sterilization device according to claim 14, further comprising an agitator that agitates air between the irradiation area and other areas in the room in which the housing is installed.

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