Facility management system

Abstract

To enable secure inactivation of a pathogen while taking safety to the human body into consideration by appropriate irradiation of light of an irradiation level sufficient for inactivating the pathogen according to the situation of the pathogen in a target region.SOLUTION: A facility management system includes: an ultraviolet irradiating source 12 for irradiating ultraviolet rays; an observation section 25 for observing an irradiated level of ultraviolet rays received by an irradiation object; and a control section 26 for irradiating ultraviolet rays from the ultraviolet irradiating source 12 when an irradiation start condition is established, and controlling an irradiation level and / or an irradiation period based on the irradiated level observed by the observation section 25 during the irradiation of ultraviolet rays. The control section 26 controls an irradiation level and / or an irradiation period so that an integrated irradiated level received by the irradiation object becomes a target level by irradiating ultraviolet rays from the ultraviolet irradiating source 12 every time when a predetermined time elapses when the irradiation start condition is not established, and performs control of stopping irradiation when an irradiation stop timing arrives during irradiation of ultraviolet rays.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a facility management system that inactivates pathogens present in a facility, such as an office building, and prevents infection by irradiating the facility with light of a predetermined wavelength according to the facility's usage status. [Background technology]

[0002] In recent years, in order to prevent infection with various infectious diseases caused by pathogens such as pathogenic bacteria, it has been recommended to wear masks, maintain social distance between people, hygienic hand washing, and disinfect and sterilize objects that are touched by hands. Examples of disinfectants that are used include ethyl alcohol, hypochlorous acid water, and sodium hypochlorite.

[0003] Meanwhile, there are known methods for inactivating pathogens such as viruses and bacteria by irradiating them with ultraviolet light. For example, there are methods that use ultraviolet light in the wavelength range including 254 nm or 265 nm, which are the peak absorption wavelengths of viral DNA (deoxyribonucleic acid) and are said to be the most efficient way to inactivate pathogens by irradiation. A low-pressure mercury lamp is used as the light source for the wavelength range including 254 nm, and an ultraviolet LED is used as the light source for the wavelength range including 264 nm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-027325 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-153456 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-133182 [Patent Document 4] Japanese Patent Application Publication No. 2018-191019 [Patent Document 5] Japanese Patent Application Publication No. 2020-009471 [Patent Document 6] Japanese Patent Application Laid-Open No. 2017-124220 Summary of the Invention [Problem to be solved by the invention]

[0005] However, ultraviolet light in the wavelength range including 254 nm or 265 nm, which is used to inactivate pathogens such as viruses and bacteria, is highly harmful to the human body, causing skin cancer and cataracts, making it unsuitable for use in places where people are present.

[0006] On the other hand, in recent years, attention has been drawn to ultraviolet rays with a wavelength of 200 to 230 nm, which have a small penetration depth (depth to which ultraviolet rays reach the skin after entering the skin) in the human body, and it has been reported that even repeated exposure to ultraviolet rays with a central wavelength of 222 nm does not induce skin cancer and is safe for human skin and eyes. An excimer lamp is used as the ultraviolet light source.

[0007] Therefore, by irradiating target areas such as rooms in office buildings with ultraviolet light in a wavelength range that includes 222 nm, which is safe for the human body, and inactivating pathogens, it is expected that infection with various infectious diseases can be suppressed.

[0008] When inactivating pathogens by irradiating them with ultraviolet light, it is necessary to control the ultraviolet light source so that the amount of ultraviolet light (amount of energy) received by the target surface, such as the wall or floor within the target area, is the amount of irradiation required to kill 99.9% of viruses, as determined through experiments, etc.

[0009] On the other hand, even if ultraviolet light in the wavelength range including 222 nm is safe for humans, continuous irradiation of ultraviolet light to the required irradiation amount in places where people are present is desirable in that it can completely inactivate pathogens, but the amount of ultraviolet light irradiation may be excessive, posing a safety risk to the human body.In addition, the increased power consumption required to irradiate ultraviolet light will increase operating costs, and further, items such as equipment and fixtures placed within the target area, as well as interior materials such as walls and floors, will deteriorate due to continued exposure to ultraviolet light, resulting in a shortened service life.

[0010] Furthermore, the degree of pathogen adhesion in target areas such as rooms in an office building varies from location to location depending on the usage situation, including the number of people entering and exiting, and the purpose of use. Therefore, if the amount of ultraviolet light irradiation is made uniform, it will not be appropriate for each location, and this is inefficient.

[0011] Furthermore, the amount of UV radiation emitted by light sources tends to gradually decrease over time due to deterioration, etc., which may result in an insufficient amount of UV radiation being received by the target, reducing the effectiveness of inactivating pathogens.

[0012] The present invention aims to provide a facility management system that appropriately controls the amount of ultraviolet radiation (amount of energy) received by the target, thereby reliably inactivating pathogens and preventing infection with infectious diseases, while taking into consideration safety for the human body, reduction in power consumption, deterioration of items and interior materials within the target area, and deterioration of the light source. [Means for solving the problem]

[0013] (Facility Management System 1) The present invention provides a facility management system that irradiates a target area with light in a wavelength band that inactivates a predetermined pathogen, The device is characterized by having a control unit that controls the light irradiation level and / or irradiation period so that the integrated irradiation level, which is the time-integrated level of light received by the irradiation target within the target area when light is irradiated, reaches a predetermined target level that inactivates the pathogens to a predetermined inactivation target.

[0014] Here, "inactivation" includes killing, reducing the number of, shortening the life span of, inhibiting proliferation of, weakening, or reducing the infectiousness of pathogens such as viruses and bacteria to the human body. Furthermore, "light irradiation level" is a concept that encompasses various expressions and indices, such as the amount of light irradiation, irradiation intensity, irradiation energy, and irradiation energy density per area or per time. Furthermore, "light exposure level" refers to the level of light received by an irradiated object within a target area as a result of light irradiation. That is, it is a concept that encompasses various expressions and indices, such as the amount of light received by the irradiated object (or observed or calculated as such), light intensity, light energy, and light energy density per area or per time. Furthermore, "accumulated exposure level" refers to the level of exposure received by an irradiated object accumulated over time. Furthermore, "inactivation target" refers to the targeted degree of inactivation. Therefore, "inactivating to the inactivation target" means, for example, inactivating a specific pathogen to a targeted proportion (inactivation target). A more specific example would be killing 99.9% of bacteria.

[0015] (Facility Management System 2) In another aspect of the present invention, a method for treating a pathogen includes: irradiating a target area with light in a wavelength range that inactivates a predetermined pathogen; an observation unit that observes the level of light irradiation received by an irradiation target within a target area by irradiating light from a light irradiation source; a control unit that irradiates light from the light irradiation source when a predetermined irradiation start condition is met, and controls the light irradiation level and / or irradiation period based on the irradiation level observed by the observation unit during light irradiation so that the integrated irradiation level obtained by integrating the irradiation level over time reaches a predetermined target level that is (sufficient to) inactivate pathogens to a predetermined inactivation target; The present invention is characterized in that:

[0016] (Controller 1: Fixes the light irradiation level and controls the irradiation period) The control unit starts irradiating light fixed at a predetermined irradiation level from the light irradiation source when a predetermined irradiation start condition is met, determines the irradiation stop timing to stop the light irradiation based on the irradiated level and the target level observed by the observation unit during the light irradiation, and controls the light irradiation to be stopped when the irradiation stop timing arrives.

[0017] (Irradiation stop control at fixed irradiation level 1) When the integrated irradiation level obtained by accumulating the irradiation level observed by the observation unit over time during light irradiation reaches a target level, the control unit determines that the time to stop irradiation has arrived and stops the light irradiation.

[0018] (Irradiation stop control with fixed irradiation level 2) The control unit calculates the target irradiation period by dividing the target level by the irradiation level observed by the observation unit at a predetermined timing immediately after the start of light irradiation, and when the elapsed period since the start of light irradiation reaches the target irradiation period, it determines that the time to stop irradiation has arrived and stops the light irradiation.

[0019] (Controller 2: Fixes the light irradiation period and controls the irradiation level) The control unit starts irradiating light from the light irradiation source when a predetermined irradiation start condition is met, calculates a target irradiation level to be received by the irradiated object based on a predetermined irradiation period and target level, controls the irradiation level of the light irradiation source so that the irradiation level observed by the observation unit during light irradiation becomes the target irradiation level, and determines that the timing to stop irradiation has arrived when the elapsed period since the start of light irradiation reaches the predetermined irradiation period, and controls to stop the light irradiation.

[0020] (Control when irradiation start conditions are not met) If a predetermined irradiation start condition is not met, the control unit irradiates light from the light irradiation source every time a predetermined time elapses, and controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiation target becomes a target level.

[0021] (Setting and controlling target levels according to purpose of use or infection risk) The control unit controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiation target reaches a predetermined target level set according to the purpose of use or the infection risk of pathogens within the target area.

[0022] (Setting and controlling target levels in small areas) The control unit divides the target area to be irradiated into multiple small areas according to the intended use, and controls the light irradiation level and / or irradiation period using a light irradiation source provided for each small area so that the cumulative irradiation level received by the small area reaches a predetermined target level set according to the intended use of the small area and / or the infection risk of the pathogen.

[0023] (Control by multi-point observation of irradiation level) The observation unit observes the irradiation level received by the irradiation target at multiple points within the target area, The control unit controls the light irradiation level and / or irradiation period so that the integrated irradiation level received by the irradiation target becomes a target level based on the minimum or average value of the irradiation levels at multiple points observed by the observation unit.

[0024] (Light irradiation control according to the usage status of the target area) The observation unit further observes the usage status of the target area, When the usage status of the target area observed by the observation unit satisfies a specified irradiation start condition, the control unit starts irradiating light from the light irradiation source and controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiated target reaches a target level.

[0025] (Light illumination control according to people entering and exiting) The observation unit observes the entry and exit of people into the target area as the usage status of the target area, The control unit irradiates light from the light irradiation source when a person enters the target area and / or when a person leaves the target area, and controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiation target reaches a target level.

[0026] (Light illumination control according to the level of crowding) The observation unit observes the degree of congestion of people in the target area as the utilization status of the target area, The control unit controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiation target reaches a predetermined target level set according to the degree of crowding of people observed by the observation unit.

[0027] (Observation of usage status using access control) The observation unit observes the usage status of the target area based on control information of an electric lock on a door provided at the entrance / exit of the target area.

[0028] (Observation of usage status using human sensors) The observation unit observes the usage status of the target area based on detection information from a human presence sensor installed in the target area.

[0029] (Observation of usage status using mobile device information) The observation unit observes the usage status of the target area based on location information or a predetermined communication signal of a mobile device carried by a person who enters the target area.

[0030] (Observation of usage status using OA equipment operation information) The observation unit observes the usage status of the target area based on the operation information of the devices installed in the target area.

[0031] (illuminance sensor) The observation unit includes an illuminance sensor that observes the illuminance of light, The illuminance sensor is A battery power source; a light receiving element that receives light from a light irradiation source and converts the light into an electrical signal; a processing unit that processes the electrical signal output from the light receiving element and outputs a signal including illuminance; a communication unit that transmits a signal including the illuminance output from the processing unit to the control unit; Equipped with.

[0032] (Monitoring light irradiation conditions) The facility management system further: Equipped with a monitor that notifies the light irradiation status within the target area, The monitor unit notifies the light irradiation status within the target area based on the level of light irradiation received by the irradiation target within the target area observed by the observation unit.

[0033] (Monitoring irradiation conditions divided into small areas) The monitor unit divides the target area into small areas according to the purpose of use and notifies the user of the light irradiation status.

[0034] (Notification of lighting conditions using map information) The monitor unit notifies the lighting conditions using map information showing the target area.

[0035] (Notification of guidance information according to light irradiation conditions) The monitor unit notifies guidance information for the target area based on the illumination state of light observed within the target area.

[0036] (Contents of the information) The monitor unit notifies, as the guidance information, information indicating at least one of the safety of the target area, excessive or insufficient light irradiation in the target area, prohibition of use of the target area, and restriction on use of the target area.

[0037] (UV irradiation with a wavelength of 222 nm) The light irradiated from the light irradiation source to the target area is ultraviolet light in a predetermined wavelength band that includes a wavelength of 222 nm and excludes 254 nm and 264 nm. [Effects of the Invention]

[0038] (Effects of facility management systems) According to the facility management system of the present invention, when light of a wavelength band that inactivates pathogens such as specified viruses or bacteria is irradiated into a target area, the light irradiation level and / or irradiation period are controlled so that the integrated irradiation level (e.g., the integrated amount of light energy) obtained by integrating the light irradiation level received by the irradiated object over time reaches a target level that inactivates (or is sufficient to inactivate) the pathogens to a specified inactivation target, for example, a target level that kills and inactivates up to 99.9% of the pathogens.This ensures that the light necessary and sufficient to inactivate pathogens attached to the irradiated object within the monitored area is irradiated, and pathogens are reliably inactivated while taking into consideration safety for the human body, reduced power consumption, suppression of deterioration of items and interior materials in the target area, deterioration of the light source, etc., making it possible to prevent infection with infectious diseases caused by various pathogens.

[0039] (Controller 1: Fixes the light irradiation level and controls the irradiation period) Furthermore, the control unit starts irradiating light from the light irradiation source at a fixed predetermined irradiation level when a predetermined irradiation start condition is met, determines the irradiation stop timing for terminating the light irradiation based on the irradiation level observed by the observation unit during light irradiation and the target level, and controls the light irradiation to stop when the irradiation stop timing arrives, thereby controlling the light irradiation period so that the cumulative irradiation level received by the irradiation target reaches the predetermined target level, thereby enabling reliable inactivation of pathogens.Furthermore, since the irradiation level from the light irradiation source is fixed at a predetermined level, there is an advantage that the light irradiation source can be controlled by simple on / off control.

[0040] (Effect of irradiation stop control 1 at fixed irradiation level) In addition, as irradiation stop control when the irradiation level is fixed, the control unit determines that the timing to stop irradiation has arrived when the accumulated irradiation level, which is the time to accumulate the irradiation level observed by the observation unit over time during light irradiation, reaches a target level, and stops the light irradiation, thereby controlling the accumulated irradiation level received by the irradiated object to reach a predetermined target level.

[0041] (Effect of irradiation stop control 2 at fixed irradiation level) In addition, as irradiation stop control when the irradiation level is fixed, the control unit calculates the target irradiation period by dividing the target level by the irradiation level observed by the observation unit at a predetermined timing immediately after the start of light irradiation, and when the elapsed period since the start of light irradiation reaches the target irradiation period, it determines that the timing to stop irradiation has arrived and stops the light irradiation, thereby controlling the accumulated irradiation level received by the irradiated object to become the predetermined target level.

[0042] (Controller 2: Fixes the light irradiation period and controls the irradiation level) Furthermore, the control unit starts irradiating light from the light irradiation source when a predetermined irradiation start condition is met, calculates the target irradiation level to be received by the irradiated object based on a predetermined irradiation period and target level, controls the irradiation level of the light irradiation source so that the irradiation level observed by the observation unit during light irradiation becomes the target irradiation level, and determines that the timing to stop irradiation has arrived when the elapsed period since the start of light irradiation reaches the predetermined irradiation period, and controls to stop the light irradiation, thereby controlling the light irradiation level so that the cumulative irradiation level received by the irradiated object becomes the target level, thereby making it possible to reliably inactivate pathogens.

[0043] (Effect of control when irradiation start conditions are not met) Furthermore, even if the specified irradiation start condition is not met, for example, when the target area of ​​the facility is not in use at night or on a holiday, the control unit periodically irradiates light from the light irradiation source every time a specified time elapses, and controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiated object reaches the target level, thereby making it possible to more reliably inactivate pathogens.

[0044] (Setting target levels according to purpose of use or infection risk and the effect of control) In addition, the control unit controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiated object becomes a predetermined target level set according to the purpose of use or the risk of infection of pathogens in the target area, thereby enabling appropriate control of the light irradiation level and / or irradiation period received by the target area in accordance with the purpose of use or the risk of infection of pathogens in the target area.

[0045] (Effects of setting and controlling target levels in small areas) In addition, the control unit divides the target area into multiple small areas according to the purpose of use, and controls the light irradiation level using a light irradiation source provided for each small area so that the cumulative irradiation level received by the small area reaches a predetermined target level set according to the purpose of use and / or the infection risk of the pathogen.This makes it possible to appropriately and precisely control the light irradiation level for irradiating small areas divided into, for example, the entrance / exit area, office area, reception area, conference area, etc. of the target area, according to the purpose of use and the infection risk.

[0046] (Effect of control through multi-point observation of irradiation levels) Furthermore, the control unit controls the light irradiation level and / or irradiation period based on the average value of the irradiation levels at the multiple observation points, thereby controlling the light irradiation level and / or irradiation period so as to suppress variations in the light illuminance level at each observation point, thereby enabling inactivation of pathogens over substantially the entire area. Furthermore, the control unit controls the light irradiation level and / or irradiation period based on the minimum value of the irradiation levels at the multiple observation points, thereby enabling reliable inactivation of pathogens over substantially the entire area, even if the observation points other than the minimum value are irradiated with light at a level exceeding the target level and there is variation in the light irradiation level at each observation point.

[0047] (Effect of controlling light irradiation according to the usage status of the target area) In addition, the control unit starts irradiating light from the light irradiation source when the usage status of the target area observed by the observation unit satisfies specified irradiation start conditions, thereby making it possible to inactivate pathogens according to the usage status of the target area.

[0048] (Effect of controlling light irradiation according to people entering and exiting) Furthermore, since pathogens are brought in from outside when a person enters the target area and remain when the person leaves the target area, by irradiating light from the light irradiation source when a person enters the target area and / or when a person leaves the target area, it becomes possible to control the irradiation level and / or irradiation period of light to reliably inactivate newly entered pathogens and pathogens remaining in the target area.

[0049] (Effect of controlling lighting according to the level of crowding) Furthermore, since the risk of pathogen infection increases the more crowded the target area is, the light irradiation level and / or irradiation period can be controlled to reach a target level set according to the degree of human congestion observed by the observation unit, making it possible to irradiate light that inactivates pathogens according to the degree of human congestion.

[0050] (Effect of access control on usage) In addition, the observation unit observes the usage status of the target area based on the control information of the electric lock on the door installed at the entrance and exit of the target area through entry and exit management, thereby easily and simply observing, for example, the presence or absence of people in the target area and the degree of congestion, and making it possible to control the irradiation level and / or irradiation period of light that inactivates pathogens based on the observation results.

[0051] (Effect of using human sensors) In addition, by observing the usage status of the target area based on detection information from a human presence sensor installed within the target area, it is possible to simply and easily observe, for example, the presence or absence of people within the target area and the degree of congestion, and control the irradiation level and / or irradiation period of light that inactivates pathogens based on the observation results.

[0052] (Effect of usage status using mobile device information) Furthermore, by observing the usage status of the target area based on location information or predetermined communication signals from mobile devices such as smartphones held by people within the target area, it is possible to simply and easily observe, for example, the presence or absence of people in the target area and the degree of congestion, and control the irradiation level and / or irradiation period of light that inactivates pathogens based on the observation results. Furthermore, since the location information of the mobile devices can be obtained from the servers of external communication companies that provide communication services for mobile devices such as smartphones without the need for dedicated equipment or facilities, the system functions and configuration are simplified and costs can be reduced.

[0053] (Effect of usage status based on the operation status of office automation equipment) In addition, office automation equipment (OA equipment) such as personal computers, copiers, facsimiles, and printers are installed within a target area of ​​a facility such as an office building and connected to a server via a local area network (LAN). By observing the usage status of the target area based on the operation information of the OA equipment obtained via the network, it is possible to easily and simply observe, for example, the presence or absence of people in the target area and the degree of congestion, and control the appropriate light illumination level and / or illumination period based on the observation results. Furthermore, the operation information of the OA equipment can be obtained without the need for dedicated devices or facilities such as sensors, simplifying the system's functions and configuration and reducing costs. Operation information of equipment other than OA equipment, such as lighting equipment, can also be similarly applied.

[0054] (Effect of illuminance sensor) The observation unit is equipped with an illuminance sensor that observes the light irradiation received by the irradiation object, and the illuminance sensor is composed of a battery power source, a light receiving element, a processing unit, and a communication unit, and is placed on the irradiation object such as a wall, floor, or desk within the target area to observe the irradiation level received by the irradiation object, making it possible to simply and easily observe the light irradiation status within the target area. In particular, if the communication unit performs wireless communication, it is possible to more simply and easily place it at any position within the target area and observe the irradiation level without the need for wiring work.

[0055] (Effect of monitoring light irradiation conditions) In addition, the facility management system is further equipped with a monitor unit that notifies the light irradiation status within the target area based on the level of light irradiation received by the irradiated object within the target area observed by the observation unit.This means that even if light in an invisible wavelength band is being irradiated, the distribution and values ​​of the illuminance and irradiation amount of light within the target area can be viewed, for example, on a monitor screen, making it possible to simply and easily grasp the light irradiation status and carry out appropriate operational management.

[0056] (Effect of monitoring irradiation conditions divided into small areas) In addition, the monitor unit notifies the light illumination status in small areas divided within the target area according to the purpose of use, etc., so that, for example, the light illumination status at that time can be checked by looking at a monitor screen for each small area into which the target room is divided, such as an entrance / exit area, office area, reception area, conference area, etc., and this makes it possible to simply and easily grasp the light illumination status when the target area is divided into small areas, enabling appropriate operational management.

[0057] (Effect of notifying lighting conditions using map information) Furthermore, the monitor unit uses map information such as a floor map showing the target area to easily and simply grasp the light illumination status within the target area, enabling appropriate operational management.

[0058] (Effect of providing guidance information according to lighting conditions) In addition, the monitor unit provides guidance information for the target area based on the light irradiation status within the target area, such as information on the safety of the target area, whether light irradiation in the target area is excessive or insufficient, whether use of the target area is prohibited, or whether use of the target area is restricted, thereby enabling quick and appropriate action to be taken in response to the light irradiation status.

[0059] (Effect of ultraviolet light irradiation at a wavelength of 222 nm) Furthermore, the light irradiated from the light irradiation source to the target area is ultraviolet light in a specific wavelength band that includes the 222 nm wavelength, which is safe for the human body, within the 200 to 280 nm wavelength band classified as ultraviolet C rays (UV-C), but excludes the 254 nm and 264 nm wavelengths, which are unsafe for the human body. This makes it safe for humans to be exposed to the light and ensures that pathogens are inactivated. [Brief explanation of the drawings]

[0060] [Figure 1] FIG. 1 is an explanatory diagram showing an outline of a facility management system. [Figure 2] FIG. 2 is an explanatory diagram showing an embodiment of an ultraviolet irradiation source. [Figure 3] FIG. 1 is an explanatory diagram showing the structure of an excimer lamp. [Figure 4] FIG. 1 is an explanatory diagram showing the structure of a lamp unit equipped with an excimer lamp. [Figure 5] 2 is a block diagram showing an embodiment of the illuminance sensor and relay device of FIG. 1. FIG. [Figure 6] 2 is an explanatory diagram showing a first embodiment of a control unit provided in the facilities management device of FIG. 1. FIG. [Figure 7] 1. FIG. 4 is an explanatory diagram showing a second embodiment of a control unit provided in the facilities management device of FIG. [Figure 8] 1. FIG. 4 is an explanatory diagram showing a third embodiment of a control unit provided in the facilities management device of FIG. [Figure 9] FIG. 2 is an explanatory diagram of an ultraviolet irradiation map screen displayed on the facility management device of FIG. 1. [Figure 10] 10 is an explanatory diagram showing the arrangement of an ultraviolet irradiation source and an illuminance sensor in a target area corresponding to FIG. 9. FIG. [Figure 11] FIG. 10 is an explanatory diagram of a control table in which infection risk levels and target levels corresponding to target areas are set, taking the second embodiment of the control unit as an example. [Figure 12] 10 is a time chart showing the timing of irradiation control corresponding to the entrance and exit of people, divided into modes. [Figure 13] 10 is a flowchart showing an outline of ultraviolet radiation control. [Figure 14] 14 is a flowchart showing details of ultraviolet radiation control in step S4 of FIG. 13, corresponding to the first embodiment of FIG. 6. [Figure 15] 14 is a flowchart showing details of ultraviolet radiation control in step S4 of FIG. 13, corresponding to the second embodiment of FIG. 7; [Figure 16] 14 is a flowchart showing details of ultraviolet radiation control in step S4 of FIG. 13, which corresponds to the third embodiment of FIG. 8. [Figure 17] 10 is a flowchart showing a monitor control process performed by a monitor unit. [Figure 18] FIG. 1 is an explanatory diagram showing an outline of a facility management system that monitors the usage status of a target area using a human presence sensor. [Figure 19] FIG. 1 is an explanatory diagram showing an overview of a facility management system that monitors the usage status of a target area using location information from a mobile device. [Figure 20] FIG. 1 is an explanatory diagram showing an overview of a facility management system that monitors the usage status of a target area using short-range wireless signals from mobile terminals. [Figure 21] FIG. 1 is an explanatory diagram showing an overview of a facility management system that observes the usage status of a target area based on the operation information of office automation equipment. DETAILED DESCRIPTION OF THE INVENTION

[0061] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a facility management system according to the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0062] [Basic concept of the embodiment] The embodiments generally relate to a facility management system, which refers to a system that appropriately operates and manages facilities used by people. Here, the term "facility" refers to a structure such as a building to be managed, and is a concept that includes, for example, office buildings, commercial facilities such as department stores and supermarkets, and public facilities such as schools and libraries.

[0063] The facility management system of this embodiment is comprised of a light irradiation source, an observation unit, and a control unit.

[0064] A "light irradiation source" refers to a device that irradiates a target area of ​​a facility with light in a wavelength band that inactivates a specific pathogen. Here, the "target area" refers to an area to which light inactivates a specific pathogen, including, for example, rooms, hallways, and staircases within a building. "Irradiating light into a target area" refers to irradiating light onto at least a portion of a specific area within the target area, such as a room, or onto a specific target within the target area, such as an object that is susceptible to pathogens. "Light in a wavelength band that inactivates a specific pathogen" refers to ultraviolet light in a specific wavelength band of 100-280 nm belonging to the ultraviolet-C (UV-C) spectrum, with a wavelength of 222 nm, which is highly effective in inactivating pathogens that are safe for the human body, but excludes wavelengths of 254 nm and 264 nm, which are dangerous to the human body.

[0065] Here is a brief explanation of ultraviolet rays. Ultraviolet rays are classified by wavelength into ultraviolet A rays (UV-A) at 315-400 nm, ultraviolet B rays (UV-B) at 280-315 nm, and ultraviolet C rays (UV-C) at 100-280 nm. Ultraviolet C rays (UV-C) have very strong sterilizing properties and can inactivate pathogens, but are also known to be harmful to the human body. Note that ultraviolet C rays (UV-C) contained in sunlight are absorbed by the ozone layer and do not reach the earth's surface.

[0066] Such ultraviolet C rays (UV-C) are emitted using, for example, low-pressure mercury lamps or ultraviolet LEDs as light sources, with low-pressure mercury lamps emitting ultraviolet rays in a wavelength band that includes 254 nm, and ultraviolet LEDs emitting ultraviolet rays in a wavelength band that includes 265 nm. The 254 nm wavelength emitted by low-pressure mercury lamps and the 265 nm wavelength emitted by ultraviolet LEDs match the peak absorption wavelength of viral DNA (deoxyribonucleic acid), making them highly effective at inactivating viruses. However, they are harmful to the human body and cannot be emitted in places where people are present.

[0067] In contrast, the ultraviolet light emitted in this embodiment in a wavelength band including 222 nm, for example, a wavelength band of 200 to 230 nm, is emitted using an excimer lamp as the light irradiation source. It has been demonstrated that repeated irradiation of 222 nm does not induce skin cancer because the wavelength has a small penetration depth (depth of penetration of ultraviolet light incident on the skin) in the human body. It is also safe for human skin and eyes, and its inactivating effect on pathogens has been reported to be equivalent to that of ultraviolet light in a wavelength band including 254 nm or 265 nm. For example, the light irradiation source irradiates ultraviolet light in a predetermined wavelength band including 222 nm, excluding the wavelengths of 254 nm and 264 nm, which are dangerous to the human body. In the following description, the term "ultraviolet light in the 222 nm band" may be used. Furthermore, ultraviolet light including wavelengths of 254 nm and 265 nm may also be referred to as "ultraviolet light in the 254 (265) nm band."

[0068] Furthermore, pathogens that can be inactivated by irradiation with light from a light irradiation source are viruses and bacteria, and although any virus can be used, examples include coronavirus, rotavirus, adenovirus, poliovirus, influenza virus, etc., and bacteria include Shigella, Vibrio cholerae, Legionella pneumoniae, Pseudomonas aeruginosa, Salmonella typhi, Salmonella paratyphi, Salmonella typhimurium, etc. In addition to these, viruses and bacteria that can be inactivated by irradiation with light are also targets.

[0069] The "observation unit" is a unit that observes the level of light received by an object within a target area by irradiating it with light from a light irradiation source. The observation of the level of light received is optional, but for example, an illuminance sensor that detects illuminance may be used.

[0070] Here, "irradiation level" refers to, for example, the illuminance of light received by an irradiated object within a target area, and "illuminance" refers to the light intensity per unit area at a specified irradiation surface of light irradiated from a light irradiation source into the target area, for example, ultraviolet light in the 222 nm band, and is a concept that includes ultraviolet light illuminance (UV illuminance). Furthermore, although the unit of illuminance is [mW / cm2], the unit of illuminance is [μW / cm2] because only a small intensity of ultraviolet light is required to inactivate pathogens.

[0071] The "control unit" irradiates light from the light irradiation source when a predetermined irradiation start condition is met, and controls the irradiation level and / or irradiation period of light from the light irradiation source based on the irradiation level observed by the observation unit during light irradiation so that the integrated irradiation level, which is the irradiation level integrated over time, reaches a predetermined target level that inactivates (or is sufficient to inactivate) pathogens to a predetermined inactivation target.

[0072] Here, "a specified irradiation start condition is met" means that any start condition that requires light irradiation to inactivate pathogens within the target area is met, for example, when a specified start condition based on the usage status of the target area is met, specifically when a person enters the target area and / or when a person leaves the target area.

[0073] The term "target level" refers to the cumulative exposure level required to inactivate the target pathogens to a predetermined inactivation target. For example, it refers to the cumulative exposure level required to inactivate a specific pathogen to a predetermined percentage (target inactivation), or more specifically, the cumulative exposure level required to kill 99.9% of the pathogens. For example, the target level is the cumulative light dose obtained by multiplying the illuminance (μW / cm²) required for the exposure time (sec), expressed in units of μW·sec / cm², and includes the concept of integrating the illuminance. Furthermore, since illuminance (μW / cm²) is expressed in units of joules (J), the cumulative light dose required for the target level is μJ / cm², a value obtained through UV irradiation experiments on various pathogens. For example, the target level required to kill 99.9% of influenza viruses is 6,600 μW·sec / cm².

[0074] The target level in the control unit is set, for example, according to the purpose of use within the target area, and also set for each small area divided within the target area according to the purpose of use, and further set according to the risk of viral or bacterial infection within the target area.

[0075] Furthermore, the inactivation target used to determine the target level is arbitrary and is not limited to an inactivation target that kills 99.9% of pathogens. Using 99.9% as the standard, a target level corresponding to a higher or lower inactivation target can be set.

[0076] In addition, even if the specified irradiation start condition is not met, the control unit irradiates light from the light irradiation source every time a specified time elapses, and controls the light irradiation level and / or irradiation period so that the cumulative irradiation level received by the irradiation target becomes the target level.

[0077] In addition, the control unit observes the irradiation level received by the irradiation object at multiple points within the target area using the observation unit, and controls the light irradiation level and / or irradiation period based on the minimum or average value of the irradiation levels at the multiple points so that the accumulated irradiation level received by the irradiation object becomes the target level.

[0078] In addition, the control unit controls the light irradiation level and / or irradiation period so that the light irradiation level and / or irradiation period reaches a predetermined target level set according to the degree of congestion observed by the observation unit.For example, when the degree of congestion is high, the target level is set to a high value, and when the degree of congestion is low, the target level is set to a low value.

[0079] The control by the control unit can be divided into, for example, a method of fixing the irradiation level of light irradiated from the light irradiation source at a constant level, and a method of varying the irradiation level. In the method of fixing the light irradiation level, the control unit starts irradiating light at a predetermined irradiation level from the light irradiation source when a predetermined irradiation start condition is met, determines the irradiation stop timing for stopping the light irradiation based on the irradiated level observed during the light irradiation and the target level, and stops the light irradiation when the irradiation stop timing arrives, thereby controlling the light irradiation period so that the integrated irradiated level obtained by integrating the irradiated level over time becomes the target level.

[0080] In this case, there are first and second irradiation stop controls for stopping light irradiation. The first irradiation stop control determines that the irradiation stop time has arrived when the integrated irradiation level, which is obtained by integrating the irradiation level observed by the observation unit over time during irradiation, reaches a target level, and stops light irradiation. The second irradiation stop control calculates the target irradiation period by dividing the target level by the irradiation level observed immediately after the start of irradiation, and determines that the irradiation stop time has arrived when the elapsed time from the start of irradiation reaches the target irradiation period, and stops light irradiation.

[0081] Furthermore, when the control unit is configured to vary the light irradiation level, it determines the target irradiation level to be received by the irradiation object based on a predetermined irradiation period and a target level, for example, by setting the irradiation period to a fixed irradiation period and dividing the target level by the fixed irradiation period, and controls the light irradiation level during light irradiation so that the irradiation level observed by the observation unit matches the target irradiation level, and when the elapsed period from the start of irradiation reaches the fixed irradiation period, it determines that the time to stop irradiation has arrived and stops the light irradiation.

[0082] The observation unit observes the usage status within the target area, and the control unit starts irradiation from the light irradiation source when the usage status of the target area observed by the observation unit satisfies a predetermined irradiation start condition. Here, the observation of the usage status within the target area by the observation unit is optional, but the observation unit may observe the usage status of the target area using, for example, control information from entrance and exit management, detection information from a human presence sensor, location information and communication information from mobile devices, or operation information from office automation equipment, and control the light irradiation level and / or irradiation period so that the light irradiation level and / or irradiation period reaches a target level according to the presence or absence of people and the degree of congestion within the target area.

[0083] Furthermore, the facility management system of this embodiment includes a monitor unit. Here, the "monitor unit" notifies the light illumination status within the target area by sound or display based on the light illumination level, e.g., illumination status, etc., within the target area observed by the observation unit. The monitor unit also notifies the light illumination status observed within the target area by dividing the target area into small areas according to the intended use, and preferably notifies the light illumination status observed within the target area using map information indicating the target area. Based on the light illumination status observed within the target area, the monitor unit also notifies guidance information for the target area, such as information indicating the safety of the target area, excessive or insufficient light illumination within the target area, prohibition of use of the target area, or use restrictions on the target area.

[0084] Specific embodiments will be described below. In the following embodiments, the "target area" is a "room," the "light irradiation source" is an "ultraviolet irradiation source using an excimer lamp," and the "light irradiated by the light irradiation source" is "ultraviolet rays in the 222 nm band (ultraviolet rays safe for the human body)."

[0085] [Specific details of the embodiment] The specific contents of the embodiment will be described separately as follows. a. Overview of the facility management system b. Immigration Control Department c. UV radiation source c1. UV irradiation source using an excimer lamp c2. Structure and operation of excimer lamps c3. Lamp unit structure c4. Lamp driver circuit section c5. Excimer lamp dimming control d. Light sensor and relay device e. Control unit e1. First embodiment of the control unit e2. Second embodiment of the control unit e3. Third embodiment of the control unit f. Examples of UV radiation control g. Control of ultraviolet irradiation g1. Overview of control operation g2. Control operation of ultraviolet irradiation according to the first embodiment g3. Control operation of ultraviolet irradiation according to the second embodiment g4. Control operation of ultraviolet irradiation according to the third embodiment h. Monitor section i. Facility management system that monitors usage status using human presence sensors j. Facility management system that monitors usage status using mobile device location information j1. Generation of observation results based on GPS location information j2. Generation of observation results using other location detection methods k. Facility management systems that monitor usage status via short-range wireless communication on mobile devices l. Facility management system that monitors usage status based on the operation information of office automation equipment m. Modifications of the present invention

[0086] [a. Overview of facility management system] FIG. 1 is an explanatory diagram showing an outline of a facility management system installed in a building, in which an office building is taken as an example of the target facility, and rooms A1, A2, . . . An on a certain floor are shown as the target area.

[0087] The facility management system of this embodiment is composed of an ultraviolet irradiation source 12 that functions as a light irradiation source, and a facility management device 24. The ultraviolet irradiation source 12 is connected to the facility management device 24 via a transmission line 36 and irradiates rooms A1 to An with light in a predetermined wavelength band that inactivates predetermined pathogens. While the ultraviolet irradiation source 12 may have any function or configuration, as an example, it irradiates ultraviolet light in the 222 nm band, such as ultraviolet light in the 200 to 230 nm range, which is safe for the human body. The facility management device 24 is a computer circuit equipped with a CPU, memory, various input / output functions, a display, etc., and is provided with an observation unit 25, a control unit 26, and a monitor unit 28 as functions realized by executing a program.

[0088] The observation unit 25 observes the irradiation level of an irradiation object exposed to ultraviolet rays irradiated into the rooms A1 to An from the ultraviolet irradiation source 12, and while its function and configuration are arbitrary, as an example, it is disposed at an arbitrary irradiation position in the rooms A1 to An, receives an illuminance detection signal transmitted by an illuminance sensor 20 connected to the facility management device 24 by a transmission path 34 via a relay device 22, and determines the irradiation level (illuminance) of the irradiation object in the rooms A1 to An. In this embodiment, one ultraviolet irradiation source 12 is provided in each of the rooms A1 to An, and multiple illuminance sensors 20 are provided corresponding to this.

[0089] The control unit 26 starts irradiating ultraviolet rays from the ultraviolet irradiation source 12 when a predetermined irradiation start condition is met in the rooms A1 to An, for example, when a person enters the room and / or when a person leaves the room, and controls the irradiation level of ultraviolet rays so that the integrated irradiation level, obtained by integrating the irradiation level observed by the observation unit 25 over time, reaches a predetermined inactivation target level of pathogens, for example, a target level that kills 99.9% of the pathogens. The control by the control unit 26 can be divided into control for fixing the irradiation level of ultraviolet rays from the ultraviolet irradiation source 12 (first and second embodiments of the control unit 26) and control for varying the irradiation level (third embodiment of the control unit 26), the details of which will be described later.

[0090] Here, the control unit 26 irradiates ultraviolet rays from the ultraviolet irradiation source 12 when a predetermined irradiation start condition is met in the rooms A1 to An, and whether this irradiation start condition is met is determined based on the usage status of the target areas, i.e., the rooms A1 to An, and therefore the observation unit 25 observes the usage status in addition to the irradiation level received by the irradiation targets of the rooms A1 to An. The function and configuration of the observation unit 25 that observes the usage status of the rooms A1 to An are arbitrary, but as an example, it utilizes the function of an entrance / exit management unit provided in the facility.

[0091] The monitor unit 28 notifies the irradiation status by sound or display based on the level of ultraviolet light received by the irradiation target in the rooms A1 to An, which are the target areas observed by the observation unit 25.

[0092] [b. Immigration Control Department] The functions and configuration of the entrance / exit management unit used by the observation unit 25 that observes the usage status of the target area in the facility are arbitrary, but as an example, it is composed of an electric lock 14, a card reader 16, an open / close detector 18, an entrance / exit management device 30, a center device 31, and a client device 32. Although not shown in the figure, an exit card reader is provided on the interior side of the door 10 of rooms A1 to An. Also, in the rooms A1 to An shown in Figure 1, the left side of the room shows the outside of the room where the door 10 is installed, and the right side of the door 10 is cut away to show the interior of the room.

[0093] The electric lock 14, card reader 16, and open / close detector 18 are connected to the access control device 30 via transmission lines 42, 38, and 40. The access control device 30 is located, for example, on each floor of a building. The center device 31 and client devices 32 are located in the building's disaster prevention center or the like, and are connected to each other, for example, via a LAN line 35, and also to the access control device 30 on each floor.

[0094] The entry / exit management control by the entry / exit management unit is as follows: A card reader 16 installed on the outside of the door 10 reads the magnetic card or contactless IC card carried by the subject and compares it with the subject ID registered in advance, and if the comparison matches and authentication is determined to be successful, an authentication signal is sent to the entry / exit management device 30.

[0095] When the entrance / exit management device 30 receives an authentication signal from the card reader 16, it outputs a control signal to the electric lock 14 of the door 10 installed in the corresponding room to unlock it and allow entry. When the person leaves the room, a card reader (not shown) installed on the inside of the room near the door 10 reads the magnetic card or contactless IC card carried by the person and compares it with the pre-registered person ID, and if the match determines that the authentication is successful, it sends an authentication signal to the entrance / exit management device 30, which then outputs a control signal to the electric lock 14 of the door 10 installed in the corresponding room to unlock it and allow the person to leave the room.

[0096] The center device 31 is, for example, a personal computer with a liquid crystal display, and displays management information such as a floor map of the building. The client device 32 is, for example, a personal computer with a liquid crystal display, and is connected to the entrance / exit management device 30 via a LAN line 35, which serves as a transmission path, and performs various setting processes such as registration, deletion, and history search of target IDs corresponding to magnetic cards or contactless IC cards between the entrance / exit management device 30 and the card reader 16.

[0097] The client device 32 controls the electric lock 14 of the door 10 to manage the entry and exit of people, thereby generating target person information as control information indicating people in the rooms A1 to An. The observation unit 25 of the facility management device 24 obtains observation results of the usage status of the rooms A1 to An, such as the presence or absence of people and the degree of crowding, based on the target person information generated by the client device 32. Here, the degree of crowding is, for example, a value obtained by dividing the number of people present in each room A1, A2, ..., An by the capacity (maximum number of people present) of each room A1, A2, ..., An, and is a concept that includes overcrowding.

[0098] The control unit 26 of the facility management device 24 determines whether the irradiation start condition corresponding to the usage status of rooms A1 to An is met based on the subject information obtained from the client device 32, and determines that the irradiation start condition corresponding to the usage status is met, for example, when a person enters room 1 to An and / or when a person leaves room A1 to An, and controls the irradiation of ultraviolet rays so that the cumulative exposure level received by the subject to be irradiated reaches the target level for inactivating pathogens.

[0099] The monitor unit 28 of the facility management device 24 displays on a display the ultraviolet irradiation conditions in the rooms A1 to An obtained as observation results by the observation unit 26, for example, by displaying map information such as a floor map of the rooms A1 to An in a color-coded manner corresponding to a preset target level or the observed irradiation level. Furthermore, since a plurality of illuminance sensors 20 are arranged in the rooms A1 to An, the monitor unit 28 displays areas in a color-coded manner corresponding to the irradiation conditions in each divided area determined by the arrangement of the illuminance sensors 20.

[0100] The monitor unit 28 also displays or sounds guidance information corresponding to the ultraviolet irradiation status based on the irradiation status in the rooms A1 to An, for example, the irradiation level. For example, if control is being performed to obtain a target level in the rooms A1 to An, the monitor unit 28 outputs guidance information to the effect that safety against pathogens is ensured in the rooms A1 to An, and if the ultraviolet irradiation level is insufficient or excessive for some reason, the monitor unit 28 outputs guidance information indicating the excess or deficiency, or guidance information indicating a prohibition or restriction on use.

[0101] [c. Ultraviolet irradiation source] Next, an embodiment of the ultraviolet irradiation source will be described in more detail with reference to Figures 2 to 4. The ultraviolet irradiation source 12 irradiates ultraviolet light in a predetermined wavelength band that inactivates pathogens, and although its function and configuration are arbitrary, it irradiates ultraviolet light in a predetermined wavelength band that belongs to ultraviolet C rays (UV-C) with a wavelength of 100 to 280 nm, for example, ultraviolet light in the 222 nm band (ultraviolet light of 200 to 230 nm including the 222 nm wavelength band).

[0102] (c1. UV irradiation source using an excimer lamp) FIG. 2 shows an embodiment of an ultraviolet irradiation source 12 using an excimer lamp, which irradiates ultraviolet light in the 222 nm wavelength band. The function and configuration of the source are arbitrary, but for example, the source is composed of a drive circuit section 46 and a lamp unit 48. The drive circuit section 46 is provided with a dimming control section 50, a commercial AC source 52, an AC / DC converter 54, and a high-frequency oscillator 56, and the lamp unit 48 is provided with, for example, four excimer lamps 60.

[0103] (c2. Structure and operation of excimer lamps) The excimer lamp 60 is a quartz glass tube with a double structure consisting of an outer tube 62 and an inner tube 64 which are integrated with both ends closed, as shown in the cross-sectional view of Figure 3(A) showing the AA cross section of Figure 3(B) and the cross-sectional view of Figure 3(B) showing the BB cross section of Figure 3(A), in which a metal electrode 68 is arranged inside the inner tube 64 and a metal mesh electrode 66 is arranged outside the outer tube 62, and the quartz glass tube is filled with a predetermined discharge gas.

[0104] When a high-frequency voltage is applied between the metal mesh electrode 66 and the metal electrode 68 from the drive circuit unit 46, the excimer lamp 60 generates a large number of thin, wire-like discharge plasmas (called "dielectric barrier discharges") between the two electrodes sandwiching the dielectric, consisting of the outer tube 62 and the inner tube 64 (between the metal mesh electrode 66 and the metal electrode 68). This plasma discharge contains high-energy electrons and is characterized by its instantaneous extinction. This plasma discharge excites the atoms of the discharge gas, momentarily transforming them into an excimer state (a state in which atomic molecules in an electronically excited state become excited dimers, which are molecules formed with other atomic molecules). When the atoms return from this excimer state to their original state (ground state), they emit light (excimer emission) with a wavelength specific to the excimer.

[0105] The emission wavelength of the excimer lamp 60 can be set by the discharge gas filled in the lamp. When a rare gas or a mixture of a rare gas and a halogen gas is used as the discharge gas, excimer light of different wavelengths can be emitted. For example, when argon (Ar), krypton (Kr), or xenon (Xe) is used as the discharge gas as the rare gas, the excimer lamp 60 has wavelengths of 126 nm, 146 nm, and 172 nm, respectively. Furthermore, when KrCl or XeCl, which is a mixture of these rare gases and a halogen (chlorine), is used as the discharge gas, the excimer lamp 60 has wavelengths of 222 nm and 308 nm, respectively.

[0106] Of these, an excimer lamp 60 with a wavelength of 222 nm and using KrCl as a discharge gas is used in the lamp unit 48 of the ultraviolet irradiation source 12 of this embodiment. The length, tube diameter, number, etc. of the excimer lamps 60 provided in the lamp unit 48 are optional.

[0107] (c3. Lamp unit structure) 4(A) and the plan view from below in FIG. 4(B), the lamp unit 48 of this embodiment irradiates ultraviolet light in the 222 nm band by the light emitted by four excimer lamps 60, and although the structure and type are arbitrary, for example, the four excimer lamps 60 are arranged with their upper halves tightly fixed below a cooling block 76 arranged inside a box-shaped lamp cover 74, and the cooling block 76 has multiple cooling fins facing upward, and the excimer lamps 60 are cooled by air. Note that a liquid cooling system in which a cooling medium is circulated through the cooling block 76 may also be used.

[0108] A quartz window 80 is disposed on the underside of the lamp cover 74, and ultraviolet light in the 222 nm band is emitted to the outside as excimer light from the quartz window 80. Mirrors 78 are disposed between and at both ends of the four lined-up excimer lamps 60 in a mountain-shaped configuration to efficiently extract light from the excimer lamps 60 and to homogenize the radiation intensity distribution on the window surface of the quartz window 80. Nitrogen gas is filled inside the lamp cover 74, which houses the cooling block 76, excimer lamps 60, and mirrors 78. Nitrogen gas does not absorb ultraviolet light with a wavelength of 222 nm, reduces the residual oxygen concentration inside the lamp cover 74, and prevents oxidation of the lamp electrodes and mirror 78. The quartz window 80 is also provided with a wavelength band filter (not shown), which irradiates ultraviolet light in the 222 nm band, for example, with a wavelength band of 200 to 230 nm.

[0109] (c4. Lamp drive circuit section) As shown in FIG. 2, four excimer lamps 60 provided in the lamp unit 48 are connected in parallel and irradiate ultraviolet light in the 222 nm band.

[0110] The drive circuit section 46 of the lamp unit 48 is composed of a commercial AC power supply 52, an AC / DC converter 54, a high-frequency oscillator 56, and a dimming control section 50. The AC / DC converter 54 receives AC power from the commercial AC power supply 52, for example, a commercial AC 100V, converts it into DC power of a predetermined DC voltage, and outputs it, and for example uses a switching regulator capable of constant voltage control and constant power control.

[0111] The high-frequency oscillator 56 receives DC power from the AC / DC converter 54 and oscillates at a predetermined frequency, applying a high-frequency voltage to four excimer lamps 60 in parallel to irradiate them with ultraviolet light in the 222 nm band by excimer emission.

[0112] (c5. Excimer lamp dimming control) The dimming control unit 50 can adjust and vary the on / off and light irradiation level (light emission level) of the excimer lamp 60 as needed. The irradiation level of the excimer lamp 60 can be adjusted arbitrarily, for example, by changing the amount of DC power supplied from the AC / DC converter 54 to the high-frequency oscillator 56, or by changing the oscillation frequency of the high-frequency oscillator 56.

[0113] To stabilize circuit operation, the oscillation frequency of high-frequency oscillator 56 is kept constant, and the amount of DC power supplied from AC / DC converter 54 to high-frequency oscillator 56 is changed to adjust the irradiation level of excimer lamp 60. Specifically, the amount of DC power supplied to high-frequency oscillator 56 is changed by changing the on-duty of PWM control (pulse width control) in a switching regulator that constitutes AC / DC converter 54 under control of dimming control unit 50, thereby adjusting the irradiation level of excimer lamp 60. Note that the irradiation level may also be changed by switching the number of excimer lamps 60 that emit light.

[0114] [d. Illuminance sensor and relay device] Next, an embodiment of the illuminance sensor and relay device provided in Fig. 1 will be described in more detail. Fig. 5 is an explanatory diagram showing the functional configuration of the illuminance sensor 20 and relay device 22. The illuminance sensor 20 is placed at any position in a room that is a target area, for example, on an object such as equipment or fixtures installed in the room, on the floor, or on a wall, and detects the illuminance of ultraviolet light irradiated from the ultraviolet irradiation source 12 as an irradiation level. The function, configuration, type, etc. of the illuminance sensor 20 are arbitrary, but as an example, it is composed of an ultraviolet light receiving unit 82, a sensor control unit 84, and a communication unit 86 connected to an antenna 88.

[0115] The ultraviolet light receiving unit 82 receives ultraviolet light in the 222 nm band and converts it into an electrical signal, and for example, a photodiode or phototransistor having sensitivity to ultraviolet-C waves with wavelengths of 100 to 280 nm is used. The sensor control unit 84 processes the light receiving signal output from the ultraviolet light receiving unit 82 to detect the irradiation level of the received ultraviolet light and outputs it to the communication unit 86.

[0116] The communication unit 86 generates a detection signal including the detected illumination level and the sensor ID, and transmits it to the relay device 22 using short-range wireless communication in the 920 MHz band, for example. The illuminance sensor 20 is powered by a battery (not shown), and the battery life is guaranteed to be, for example, more than 10 years.

[0117] The relay device 22 receives the detection signal sent from the illuminance sensor 20 and transmits the detection signal including the detected irradiation level and the sensor ID to the facility management device 24 shown in Figure 1. Its functions and configuration are arbitrary, but it may be composed of, for example, a communication unit 92 connected to an antenna 90, a relay control unit 94, and a transmission unit 96.

[0118] The communication unit 92 receives a detection signal transmitted from the illuminance sensor 20 using the 920 MHz band and outputs it to the relay control unit 94. The relay control unit 94 validates the received detection signal when the sensor ID of the received detection signal matches a pre-registered sensor ID, and outputs the exposure level and sensor ID acquired from the validated detection signal to the transmission unit 96. The transmission unit 96 generates a detection signal including the exposure level and sensor ID output from the relay control unit 94, and transmits it to the facility management device 24 of Fig. 1 by a known transmission method.

[0119] The connection between the ultraviolet sensor 20 and the relay device 22 may be via a signal line instead of a wireless line, or the ultraviolet sensor 20 may be directly connected to the facility management device 24 via a signal line without using a relay device.

[0120] [e. Control unit] Next, an embodiment of the control unit provided in the facility management device of Fig. 1 will be described in more detail. The configuration and function of the control unit 26 are arbitrary, but in this embodiment, First embodiment: The ultraviolet irradiation source 12 is fixed, and the ultraviolet irradiation period is controlled by calculating the integrated irradiation level. Second embodiment: The ultraviolet irradiation source 12 is fixed, and the ultraviolet irradiation period is controlled by determining a target irradiation period. Third embodiment: The ultraviolet irradiation source 12 is variable, and the ultraviolet irradiation level is controlled by determining the target irradiation level. It shall be one of the following.

[0121] (e1. First embodiment of control unit) FIG. 6 shows a first embodiment of a control unit 26 provided in a facilities management device 24, together with an observation unit 25, an ultraviolet irradiation source 12, an illuminance sensor 20, and a relay device 22.

[0122] The control unit 26 of this embodiment keeps the irradiation level of the ultraviolet irradiation source 12 constant, and when a predetermined irradiation start condition is met in the room that is the target area, starts irradiating ultraviolet rays from the ultraviolet irradiation source 12, and controls the integrated irradiation level σp, which is the time-integrated irradiation level p observed by the observation unit, to become a predetermined target level Pt that will inactivate pathogens to a predetermined target, for example, 99.9%.The function and configuration of the control unit 26 are arbitrary, but as an example, it is composed of an irradiation start condition judgment unit 100, a target level setting unit 104, an irradiation level integration unit 105, and a comparison unit 108, as shown in Figure 6.

[0123] The irradiation start condition determination unit 100 determines whether a predetermined irradiation start condition is met, and the irradiation start condition can be any, but as an example, based on the usage status of the room that is the target area, for example, information indicating the presence or absence of a person, for example, when a person enters the room and / or when a person leaves the room, it determines that the irradiation start condition is met for each of these times, as these are likely to be times when pathogens are carried into the room and / or when pathogens remain in the room, and outputs an irradiation start signal E1 to the ultraviolet irradiation source 12, and the drive circuit unit 46 shown in Figure 2 turns on the excimer lamp 60 of the lamp unit 48 to start ultraviolet irradiation. In addition, the establishment of the irradiation start condition is determined appropriately depending on various usage statuses related to pathogen infection in the target area.

[0124] Furthermore, ultraviolet irradiation may be performed based on the settings of a timetable other than when the irradiation start condition is satisfied by the irradiation start condition determination unit 100. The function and configuration of the timetable are arbitrary, but for example, an irradiation start time and an irradiation end time may be set for each day divided into weekdays, holidays, special days, etc., and ultraviolet irradiation may be performed at predetermined intervals, such as every hour, during the period from the irradiation start time to the irradiation end time, when it is determined that the irradiation start condition is satisfied.

[0125] The target level setting unit 104 presets a target level Pt for inactivating a predetermined pathogen to a predetermined inactivation target, for example, a target level Pt for killing 99.9% of the pathogens. The target level is a predetermined value determined according to the pathogen, such as a virus or bacterium, to be inactivated, and since the value differs depending on the pathogen, if there is one pathogen to be irradiated, a target level corresponding to that pathogen is set, and if multiple types of pathogens are to be irradiated, the target level with the highest value is set.

[0126] Furthermore, the target level is based on the target level that kills 99.9% of the target pathogens, and the target level for inactivation can be set at a specified percentage higher or lower than that. For example, if priority is placed on pathogen inactivation, the specified target level should be more than 1 times the target level for killing 99.9% of the pathogens. On the other hand, if priority is placed on safety for the human body or if it is expected that there will be little pathogen adhesion, the specified target level should be less than 1 times the target level for killing 99.9% of the pathogens.

[0127] The irradiation level integrating unit 105 integrates the irradiation level p output from the observing unit 25 over time during irradiation with ultraviolet light, and outputs the integrated irradiation level σp to the comparing unit 108 .

[0128] Here, a plurality of illuminance sensors 20 are arranged in a room that is the target area, and the observation unit 25 obtains the irradiation levels at a plurality of observation points as observation results via the relay device 22. The observation unit 25 is provided with an irradiation level processing unit 98, which calculates the average or minimum value of the irradiation levels at the plurality of observation points obtained as observation results, and outputs this to the irradiation level accumulating unit 105 as the detected irradiation level p.

[0129] When the average value of the irradiation levels at multiple observation points is used, the irradiation levels at multiple observation points are averaged, thereby reducing the variation (error) in the irradiation levels at each observation point. Also, when the minimum value of the irradiation levels at multiple observation points is used, the accumulated irradiation levels at observation points other than the minimum value will exceed the target level, enabling more reliable inactivation of pathogens overall. Note that when there is only one illuminance sensor 20, the irradiation level detected by that illuminance sensor 20 is used directly for accumulation.

[0130] The comparison unit 108 compares the accumulated irradiation level σp output by the irradiation level accumulation unit 106 with the target level Pt output from the target level setting unit 104, and when the accumulated irradiation level σp matches the target level Pt, it determines that the time to stop irradiation has arrived and outputs an irradiation stop signal E2 to the ultraviolet irradiation source 12 to stop the irradiation of ultraviolet rays.As a result, the object to be irradiated is exposed to ultraviolet rays at the target level.

[0131] (e2. Second embodiment of control unit) 7 shows a second embodiment of the control unit 26, which keeps the irradiation level from the ultraviolet irradiation source 12 constant, and starts irradiating ultraviolet rays from the ultraviolet irradiation source 12 when a predetermined irradiation start condition is met in a room that is the target area, and when a target irradiation period Tt has elapsed that is set based on the irradiation level p observed immediately after the start of irradiation and the target level Pt, it determines that the timing to stop irradiation has arrived and stops the irradiation, controlling so that the integrated irradiation level received by the irradiation target becomes the predetermined target level Pt. The functions and configuration are arbitrary, but as an example, as shown in FIG. 7, it is composed of an irradiation start condition judgment unit 100, a timer 102, a target level setting unit 104, a target irradiation period calculation unit 106, and a comparison unit 108.

[0132] The irradiation start condition determination unit 100 is the same as that shown in FIG. 6, and when a predetermined irradiation start condition is met, it outputs an irradiation start signal E1 to the ultraviolet irradiation source 12, and causes the drive circuit unit 46 shown in FIG. 2 to turn on the excimer lamp 60 of the lamp unit 48, thereby starting ultraviolet irradiation.

[0133] The timer 102 counts the ultraviolet irradiation period T in units of seconds, for example, and starts when the irradiation start condition determination unit 100 determines that the irradiation start condition is met and outputs an irradiation start signal E1, and outputs the irradiation period T being counted to the comparison unit 108. The target level setting unit 104 is the same as in Fig. 6, and sets a target level Pt for inactivating a predetermined pathogen to a predetermined inactivation target.

[0134] When the irradiation start condition determination unit 100 determines that the irradiation start condition is met and outputs the irradiation start signal E1, the target irradiation period calculation unit 106 divides the target level Pt set by the target level setting unit 104 by the irradiation level p received by the irradiation target observed by the observation unit 25 to calculate the target irradiation period Tt, and outputs the result to the comparison unit 108. (Target level Pt) = (irradiation level p) × (target irradiation period Tt) This is based on the relationship between

[0135] Here, the observation unit 25 is provided with an irradiation level processing unit 98, which, similarly to the embodiment of FIG. 6, calculates the average or minimum value of the irradiation levels at a plurality of observation points obtained as observation results by a plurality of illuminance sensors 20, outputs this as the detected irradiation level p to the target irradiation period calculation unit 106, and calculates the target irradiation period Tt.

[0136] The comparison unit 108 compares the target irradiation time Tt output by the target irradiation period calculation unit 106 with the irradiation time T, which is the elapsed time from the start of irradiation output from the timer 102, and when the irradiation time T matches the target irradiation time Tt, it determines that the timing to stop irradiation has arrived and outputs an irradiation stop signal E2 to the ultraviolet irradiation source 12 to stop ultraviolet irradiation, resulting in ultraviolet irradiation at the target level.

[0137] (e3. Third embodiment of control unit) 8 shows a third embodiment of the control unit 26 provided in the facility management device 24. The control unit 26 of this embodiment varies the irradiation level PS of ultraviolet light irradiated from the ultraviolet irradiation source 12, calculates a target irradiation level po of the irradiation target based on a predetermined irradiation period Tt and a target level Pt, starts ultraviolet light irradiation from the ultraviolet irradiation source 12 when a predetermined irradiation start condition is met, controls the irradiation level PS of the ultraviolet irradiation source 12 so that the irradiation level p observed by the observation unit 25 during ultraviolet light irradiation becomes the target irradiation level po, and determines that the irradiation stop timing based on the predetermined irradiation period Tt has arrived, and stops ultraviolet light irradiation. The control unit 26 may have any function and configuration, but as an example, as shown in FIG. 8, it is configured with an irradiation start condition determination unit 100, an irradiation period setting unit 112, a target level setting unit 104, a target irradiation level setting unit 114, a deviation calculation unit 116, and an output unit 118.

[0138] The irradiation start condition determination unit 100 is similar to the embodiment in FIG. 6 and determines whether a predetermined irradiation start condition is met. For example, when a person enters a room and / or when a person leaves the room, it determines that the irradiation start condition is met, outputs an irradiation start signal E1 to the ultraviolet irradiation source 12, and turns on the excimer lamp 60 of the lamp unit 48 via the drive circuit unit 46 shown in FIG. 2, thereby starting ultraviolet irradiation.

[0139] The irradiation period setting unit 112 sets a predetermined fixed irradiation period Tf for irradiating ultraviolet rays for a certain period of time. The fixed irradiation period Tf to be set is arbitrary, but for example, a period equivalent to the target irradiation period Tt calculated in the embodiment of FIG. 7 is set as the fixed irradiation period Tf.

[0140] Here, the irradiation start condition judgment unit 100 has a predetermined fixed irradiation period Tf set by the irradiation period setting unit 112, and when the irradiation start condition is met and ultraviolet irradiation is started, it starts a timer to count the elapsed period T, and when the elapsed time T matches the predetermined fixed irradiation period Tf, it determines that the timing to stop irradiation has arrived and outputs an irradiation stop signal E2 to the ultraviolet irradiation source 12 to stop the ultraviolet irradiation.

[0141] The target level setting unit 104 is similar to the embodiment of FIG. 6, and presets a target level Pt for inactivating a predetermined pathogen to a predetermined inactivation target, for example, a target level Pt for killing 99.9% of the pathogens.

[0142] When the irradiation start condition determination unit 100 determines that the irradiation start condition is met and outputs an irradiation start signal E1, the target irradiation level setting unit 114 divides the target level Pt set by the target level setting unit 104 by the fixed irradiation period Tf set by the irradiation period setting unit 112 to calculate the target irradiation level po, and outputs the result to the deviation calculation unit 116. (Target level Pt) = (Target exposure level po) × (Fixed exposure period Tf) This is based on the relationship between

[0143] The deviation calculation unit 116 calculates the deviation Δp between the target exposure level po output from the target exposure level setting unit 114 and the exposure level p output from the observation unit 26 as Δp=po-p and outputs it to the output unit 118. The deviation Δp has a positive or negative value.

[0144] Here, the observation unit 25 is provided with an irradiated level processing unit 98, which, similarly to the embodiment of FIG. 6, calculates the average or minimum value of the irradiated levels at a plurality of observation points obtained as observation results by a plurality of illuminance sensors 20, outputs this as the detected irradiated level p to the deviation calculation unit 116, and calculates the deviation Δp from the target irradiated level po.

[0145] If the deviation Δp from the deviation calculation unit 116 is positive, the output unit 118 outputs an irradiation level decrease signal E3 to the ultraviolet irradiation source 12 to decrease the irradiation level PS, whereas if the deviation Δp is negative, the output unit 118 outputs an irradiation level increase signal E4 to the ultraviolet irradiation source 12 to increase the irradiation level PS. This feedback controls the irradiation level PS of the ultraviolet irradiation source 12 so that the irradiation level p observed by the observation unit 25 becomes the target irradiation level po, and the integrated irradiation level received by the irradiation target during the fixed irradiation period Tf becomes the target level Pt, thereby enabling reliable inactivation of pathogens.

[0146] [f. Specific examples of UV irradiation control] Next, a specific example of ultraviolet radiation control according to the purpose of use of the room as the target area and the infection risk of pathogens will be described in more detail.

[0147] Fig. 9 is an explanatory diagram showing an example of an ultraviolet irradiation map screen displayed on the facility management device of Fig. 1. The ultraviolet irradiation map screen 120 of Fig. 9 displays a floor plan of a certain floor of an office building that is the target area, which is made up of, for example, an entrance / exit area 122, a first office area 124, a second office area 126, a reception area 128, and a conference area 130, and the first office area 124 and the second office area 126 are divided into two small areas (subregions) according to the purpose of use within the same room.

[0148] Figure 10 is an explanatory diagram showing the arrangement of ultraviolet irradiation sources and illuminance sensors in the target area corresponding to Figure 9, and one ultraviolet irradiation source 12 is installed in each of the entrance / exit area 122, first office area 124, second office area 126, reception area 128 and conference area 130, and multiple illuminance sensors 20 are installed.

[0149] Figure 11(A) is an explanatory diagram of a control table 132 in which the infection risk level and target level Pt of pathogens corresponding to the target area shown in Figures 9 and 10 are set, and also shows, as an example, a storage location for the irradiation level p to be received by the irradiation target and the target irradiation period Tt, which are used as control parameters in the second embodiment of the control unit 26 shown in Figure 7, and Figure 11(B) shows specific numerical examples.

[0150] The infection risk level of the target areas corresponds to their purpose of use, for example, the entrance / exit area is the highest at "high," followed by the first office area with many desks (people) at "upper medium," the second office area with fewer desks (people) at "medium," the conference area at "lower medium" based on frequency of use, and the reception area at "low" because it is used less frequently. Note that the infection risk level for each area is set arbitrarily, and there is no prohibition on dividing it into any level.

[0151] For example, the target level Pt is set at Pt3 for the second office area, where the infection risk is "medium," with a specified inactivation target, for example, Pt3 = 10,000 [μW·s / cm2], which is the target level for killing 99.9% of a certain pathogen.Based on this, the exit area is set at 1.5 times this, Pt1 = 15,000 [μW·s / cm2], the first office area is set at 1.25 times this, Pt2 = 12,500 [μW·s / cm2], the conference area is set at 0.75 times this, Pt4 = 7,500 [μW·s / cm2], and the reception area is set at 0.5 times this, Pt5 = 5,000 [μW·s / cm2]. The target level is shown as an example, as the value required to kill 99.9% of the majority of currently known pathogens such as viruses and bacteria does not exceed 10,000 [μW·s / cm2], and is not limited to this value.

[0152] Furthermore, when the irradiation start conditions are met in the target areas and ultraviolet irradiation begins, the observed irradiation levels p are, for example, p1 = 100 [μW / cm2] in the entrance / exit area, p2 = 75 [μW / cm2] in the first office area, p3 = 125 [μW / cm2] in the second office area, p4 = 100 [μW / cm2] in the reception area, and p5 = 50 [μW / cm2] in the conference area. Then, the target irradiation periods Tt calculated by dividing the target levels for each area by the irradiation levels are Tt1 = 150 [sec] in the entrance / exit area, Tt2 = 167 [sec] in the first office area, Tt3 = 80 [sec] in the second office area, Tt4 = 50 [sec] in the reception area, and Tt5 = 150 [sec] in the conference area, and ultraviolet irradiation is controlled for each target irradiation period. The target level value is also an example, and is arbitrarily determined depending on the illuminance [w / cm2] on the tube surface of the excimer lamp used and the distance to the illuminance sensor.

[0153] Furthermore, the degree of congestion in the target area may be set instead of the infection risk level in the control table 132. Since the degree of congestion and the degree of infection risk are correlated, and the higher the degree of congestion, the higher the infection risk, the target level is set to be higher as the degree of congestion increases. Furthermore, since the degree of congestion changes depending on the usage situation, the target level may be changed in accordance with changes in the degree of congestion.

[0154] FIG. 12 is a time chart showing the control timing of ultraviolet irradiation in different modes when irradiation start conditions corresponding to the entry and exit of a person in the target area are met. FIG. 12(A) shows the entry and exit of a person, with the person entering at time t1 and leaving at time t2. In the first mode of FIG. 12(B), the ultraviolet irradiation source 12 is turned on when a person enters at time t1, and ultraviolet rays are irradiated for a target irradiation time determined, for example, by the control table 132 shown in FIG. 11. In the second mode of FIG. 12(C), ultraviolet rays are not irradiated when a person enters at time t1, but are irradiated when a person leaves at time t2. In the third mode of FIG. 12(D), ultraviolet rays are irradiated both when a person enters at time t1 and when a person leaves at time t2. In the control using the control table 132 of FIG. 10, one of the first to third modes is preset depending on the purpose and usage status of the target area, and the mode is changed as needed.

[0155] [g. Control of UV irradiation] (g1. Overview of control operation) Next, an outline of the ultraviolet radiation control operation performed by the control unit 26 provided in the facilities management device 24 will be described with reference to the flowchart of FIG.

[0156] 13, the control unit 26 reads the control table 132 for the target area shown in Fig. 11 in step S1, and then reads, as the usage status of the target area, for example, the number of people entering and leaving the target area in step S2. Next, in step S3, it determines that a predetermined irradiation start condition is met, for example, when a person enters the target area shown in Fig. 10 and / or when a person leaves the target area, and in step S4 it controls ultraviolet irradiation based on any of the first to third embodiments shown in Fig. 6 to 8. When ultraviolet irradiation is completed, the process returns to step S2 and prepares for the next irradiation start condition to be met.

[0157] (g2. Control operation of ultraviolet irradiation according to the first embodiment) Fig. 14 is a flowchart showing details of the ultraviolet irradiation control in step S4 of Fig. 13, which is control according to the first embodiment of the control unit 26 shown in Fig. 6. In Fig. 14, the control unit 26 sets the target level Pt for the target area by referring to the control table 132 previously read in step S11, and then proceeds to step S12, where it outputs an irradiation start signal to the ultraviolet irradiation source 12 to start irradiating ultraviolet rays.

[0158] Next, in step S13, the irradiation level p obtained as the observation result is read and integrated to calculate the integrated irradiation level σp, and in step S14 it is determined whether it reaches the target level Pt. If it is determined in step S14 that the integrated irradiation level σp has reached the target level Pt, the process proceeds to step S15, an irradiation stop signal is output to the ultraviolet irradiation source 12 to stop the irradiation of ultraviolet light, and the process returns to step S2 in Fig. 13 to prepare for the establishment of the next irradiation start condition.

[0159] (g3. Control operation of ultraviolet irradiation according to the second embodiment) Fig. 15 is a flowchart showing details of the ultraviolet irradiation control in step S4 of Fig. 12, which is control according to the second embodiment of the control unit 26 shown in Fig. 7. In Fig. 15, the control unit 26 sets the target level Pt for the target area by referring to the control table 132 previously read in step S21, and then proceeds to step S22, where it outputs an irradiation start signal to the ultraviolet irradiation source 12 to start irradiating ultraviolet rays, and also starts a timer to begin counting the irradiation period T.

[0160] Next, in step S23, the irradiation level p obtained as the observation result is read, and in step S24, the target level Pt is divided by the irradiation level p to calculate the target irradiation period Tt, and in step S25, it is determined whether the irradiation period T measured by the timer reaches the target irradiation period Tt. If it is determined in step S25 that the irradiation period T has reached the target irradiation period Tt, the process proceeds to step S26, where an irradiation stop signal is output to the ultraviolet irradiation source 12 to stop the irradiation of ultraviolet light, and the process returns to step S2 in Figure 13 to prepare for the establishment of the next irradiation start condition.

[0161] (g4. Control operation of ultraviolet irradiation according to the third embodiment) Fig. 16 is a flowchart showing details of the ultraviolet irradiation control in step S4 of Fig. 12, and is control according to the third embodiment of the control unit 26 shown in Fig. 8. In Fig. 16, the control unit 26 sets a target irradiation level po based on a preset fixed irradiation period Tf and a target level Pt of the target area in step S31, and then proceeds to step S32, outputs an irradiation start signal to the ultraviolet irradiation source 12 to start ultraviolet irradiation, and also starts a timer to start counting the irradiation period T. Next, in step S33, the irradiation level p obtained as an observation result is read, and in step S34, the deviation Δp from the target irradiation level pt is calculated. Next, if it is determined in step S35 that the deviation Δp is a positive value, the process proceeds to step S36, where the irradiation level PS of the ultraviolet irradiation source 12 is increased. On the other hand, if it is determined in step S37 that the deviation Δp is a negative value, the process proceeds to step S38, where the irradiation level PS of the ultraviolet irradiation source 12 is decreased. If the deviation Δp is neither positive nor negative but zero, the process proceeds to step S39, where the irradiation level PS of the ultraviolet irradiation source 12 is maintained.

[0162] Next, the process proceeds to step S40, where it is determined whether the irradiation period T measured by the timer reaches the fixed irradiation period Tf, and if not, the process repeats from step S33, and the irradiation level PS of the ultraviolet irradiation source 12 is feedback-controlled so that the irradiation level p received by the irradiation target becomes the target irradiation level po. If it is determined in step S40 that the irradiation period T has reached the fixed irradiation period Tf, the process proceeds to step S41, where an irradiation stop signal is output to the ultraviolet irradiation source 12 to stop the irradiation of ultraviolet light, and the process returns to step S2 in Fig. 13 to prepare for the establishment of the next irradiation start condition.

[0163] Instead of determining whether the deviation Δp is positive or negative, the irradiation level PS may be decreased when the deviation is equal to or greater than a predetermined deviation threshold +Δpth, increased when the deviation is equal to or less than a predetermined deviation threshold -Δpth, and maintained when the deviation is between +Δpth and -Δpth.

[0164] [h. Monitor section] Next, a more detailed description will be given of an embodiment of the monitor unit 28 provided in the facility management device 24 of Fig. 1. The monitor unit 28 notifies the ultraviolet irradiation status within the target area observed by the observation unit 25, and while the monitor unit 28 may have any function or configuration, as an example, it notifies the ultraviolet irradiation status observed within the target area using an ultraviolet irradiation map screen 120 shown in Fig. 9.

[0165] As described above, the ultraviolet irradiation map screen 120 in FIG. 9 displays the target area divided into an entrance / exit area 122, a first office area 124, a second office area 126, a reception area 128, and a conference area 130. Of these, the first office area 124 and the second office area 126 are two smaller areas (subregions) within the same room. Here, the first office area 124, the second office area 126, and the reception area 128 are currently being irradiated with ultraviolet light, and are distinguishably displayed, for example, in a predetermined color that darkens in accordance with the magnitude of the target levels Pt1 to Pt4 shown in FIG. 12, or in different colors. For example, it is clear at a glance that the ultraviolet irradiation level for the entrance / exit area 122, which has the darkest display color, is high. Furthermore, the conference area 130 is not currently being irradiated with ultraviolet light and is waiting for the irradiation conditions to be met, so it is displayed white and does not display a color indicating ultraviolet light irradiation.

[0166] Furthermore, since the monitor unit 28 obtains the irradiation level detected by the illuminance sensor 20 placed in the target area by the observation unit 25 as the observation result, it may display a sensor mark indicating the illuminance sensor 20 shown in Fig. 10 on the ultraviolet irradiation map screen 120 in Fig. 9, and may numerically display the detected irradiation level (illuminance) value near the sensor mark. This makes it possible to easily check what level of ultraviolet irradiation is actually obtained.

[0167] In addition, based on the ultraviolet light irradiation conditions observed within the target area, the monitor unit 28 displays and / or sounds information indicating the safety of the target area, whether light irradiation in the target area is excessive or insufficient, whether use of the target area is prohibited, or whether use of the target area is restricted, as guidance information for the target area.

[0168] Fig. 17 is a flowchart showing the monitor control process by the monitor unit. In Fig. 17, the monitor unit 28 determines a status change, such as the start or end of ultraviolet irradiation of the irradiation target in the target area, in step S51. If the monitor unit 28 determines a status change from the observation result of the irradiation level by the observation unit 25, the process proceeds to step S52, where the area where the status change occurred is identified, and in step S53, as shown in Fig. 9, the change in irradiation status is displayed on the ultraviolet irradiation map screen 120. Next, the process proceeds to step S54, and if the presence of guidance information is determined, the process proceeds to step S55, where the guidance information is output by display and / or sound, and the process returns to step S51 to wait for the next status change.

[0169] [i. Facility management system that monitors usage status using human sensors] Next, with reference to FIG. 18, a facility management system that monitors the usage status within a target area based on the observed values ​​of a human presence sensor installed within the target area will be described in detail.

[0170] As shown in FIG. 18, a facility management device 24 is installed in an office building, which is the target facility, and an ultraviolet irradiation source 12 and an illuminance sensor 20 are placed in rooms A1 and A2, which are the monitoring areas. As in the embodiment of FIG. 1, the facility management device 24 is provided with the functions of an observation unit 25, a control unit 26, and a monitor unit 28, each of which realizes the same functions as described above. Note that the number of rooms is arbitrary, and only a portion of room A2 is shown, while subsequent rooms are not shown. Note that in the following explanation, "rooms A1, A2, ..." will be expressed as "room Ai," where i is an integer between 1 and 2, n, indicating different rooms.

[0171] In addition, the observation unit 25 of the facility management device 24 observes the usage status within the target area based on the detection information of the human presence sensor 140 installed in the room Ai that is the target area.

[0172] The human presence sensor 140 detects a person entering the room Ai and outputs an observation value. Its function, configuration, and type are arbitrary, but for example, it detects infrared rays emitted from the human body using a pyroelectric element and outputs a human body detection signal as an observation value of the person. A lens structure formed on the sensor cover that houses the pyroelectric element forms multiple detection areas that spread radially, and outputs a human body detection signal from changes in infrared rays (differential characteristics) detected when a person passes through the detection area.

[0173] In this embodiment, the motion sensors 140 are installed in two separate locations in room Ai, thereby covering the entire room as a detection area. The number of motion sensors 140 installed in room Ai is arbitrary. For example, room Ai may be divided into multiple detection areas, and motion sensors 140 may be installed to cover each detection area, or the motion sensors 140 may be installed so that predetermined irradiation targets in room Ai, such as desks, floor mats at entrances, and other locations prone to pathogen contamination, are set as detection areas. Some facilities are equipped with security sensors that monitor the intrusion of suspicious individuals. Some security sensors detect infrared rays emitted from the human body, just like the motion sensors 140. Therefore, the motion sensors of a security system installed in the facility may be used as motion sensors 140.

[0174] The human presence sensor 140 installed in room Ai is connected to facility management device 24 via transmission path 37, and observation unit 25 of facility management device 24 receives a human body detection signal as an observation value from the human body detection sensor 140 installed in room Ai, and generates and stores an observation result (detection information) indicating the presence or absence of a person, which corresponds to the occupancy status of each room Ai. That is, when observation unit 25 receives a human body detection signal from human body detection sensor 140, it registers the presence of a person in the room, and when the human body detection signal is no longer received, it erases the registration of the presence of a person and marks the room as unaware. Furthermore, if room Ai is divided into multiple small areas and human presence sensors 140 are installed therein, observation results indicating the presence or absence of a person are generated and stored for each of the small areas divided into room Ai.

[0175] When the control unit 26 of the facility management device 24 determines that the irradiation condition has been met based on the observation results indicating the presence or absence of a person from the human presence sensor 140, it controls the irradiation of ultraviolet light from the ultraviolet irradiation source 12 to inactivate pathogens so that the cumulative irradiation level received by the irradiation target reaches a predetermined target level.

[0176] Since the human presence sensor 140 cannot obtain a human body detection signal unless there is detectable movement from the person in the room, the observation unit 25 erases the registration of a person being present in the room and marks the person as absent when the state in which the human body detection signal is not received continues for a predetermined period of time.

[0177] [j. Facility management system that monitors usage status using mobile device location information] Next, a facility management system that monitors the usage status within a target area based on the location information of a mobile terminal will be described in detail.

[0178] As shown in Fig. 19, a facility management device 24 is installed in an office building that is a target facility, and an ultraviolet irradiation source 12 and an illuminance sensor 20 are placed in a room Ai that is a monitoring area. Similar to the embodiment in Fig. 1, the facility management device 24 is provided with the functions of an observation unit 25, a control unit 26, and a monitor unit 28, each of which realizes the same functions as described above.

[0179] In addition, the observation unit 25 of the facility management device 24 observes the usage status of the room Ai based on the location information of the mobile terminal 142 held by the person in the room Ai, and generates an observation result indicating, for example, whether or not a person is present.

[0180] (j1.Generation of observation results based on GPS location information) Here, the method for detecting the position of the mobile terminal 142 is arbitrary, but for example, the mobile terminal 142 uses a function for detecting its own GPS position information (latitude, longitude, and altitude in Earth coordinates) based on a GPS (Global Positioning System), and transmits the GPS position information detected by the mobile terminal 142 via a base station 144 and a network 146 to a mobile terminal management server 148 owned by a communications company that provides communications services for the mobile terminal 142. The mobile terminal management server 148 identifies the mobile terminal 142 present in the room Ai based on the GPS position information of the mobile terminal 142 and map information indicating the room Ai of the building, and transmits the identification result to the facility management device 24, and the observation unit 25 generates an observation result indicating the usage status of each room Ai, for example, whether or not a person is present.

[0181] To explain the generation of observation results in more detail, when the observation unit 25 receives the terminal identification information of the mobile terminals 142 from the mobile terminal management server 148, it generates target person information indicating the people for each room Ai by registering the information in a target person management table in memory for each room Ai. If the information is already registered, it updates the registration by overwriting it. Furthermore, if the terminal identification information of the mobile terminal 142 registered in the target person management table is not updated and registered for a predetermined period of time, the observation unit 25 determines that the mobile terminal 142 is not present in the room Ai and deletes the registration. As a result, the observation unit 25 calculates the number of people present in each room Ai from the number of pieces of terminal identification information of the mobile terminals 142 registered for each room Ai in the target person management table as target person information, and generates observation results indicating, for example, the presence or absence of people as the room usage status.

[0182] (j2. Generation of observation results using other position detection methods) In addition, other known location detection methods for mobile terminal 142 include the Time Difference of Arrival (TDOA) method and the Received Signal Strength Indicator (RSSI) method. Therefore, using these location detection methods, mobile terminal management server 148 may detect mobile terminal 142 present in room Ai, which is the target area, transmit the terminal identification information to facility management device 24, and generate observation results in observation unit 25 indicating the usage status of room Ai, for example, whether or not a person is present.

[0183] Here, the Time Difference of Arrival (TDOA) method is a method of measuring the arrival time of radio waves at multiple base stations and detecting the position of the mobile terminal 142 by trilateration. The Received Signal Strength Indicator (RSSI) method is a method of measuring the radio wave intensity at multiple base stations and detecting the position of the mobile terminal 142 by trilateration. Trilateration uses two base stations whose coordinates have already been determined, and measures the distance between the mobile terminal 142 and the two base stations, which is determined by the radio wave arrival time difference or radio wave reception intensity, to determine the coordinate position of the mobile terminal 142 as the intersection of a circle with a radius.

[0184] When the control unit 26 of the facility management device 24 determines that the irradiation start conditions are met based on the observation results indicating the usage status of the room Ai, for example, whether or not a person is present, generated by the observation unit 25 from the location information of the mobile terminal 142, the control unit 26 controls the irradiation of ultraviolet rays from the ultraviolet irradiation source 12 to inactivate pathogens so that the cumulative irradiation level received by the irradiation target reaches a predetermined target level.

[0185] In this embodiment, the mobile terminal 142 present in the room Ai may be detected based on both the GPS location information of the mobile terminal 142 and location information obtained by the time difference of arrival method or the radio wave reception strength method. For example, depending on the location of the building, there may be cases where the mobile terminal 142 is unable to receive radio waves from the GPS satellites and therefore unable to detect the GPS location information. In such cases, location information obtained by the time difference of arrival method or the radio wave reception strength method is used.

[0186] Furthermore, since the observation unit 25 can determine the number of people occupying each room Ai from the number of terminal identification information of the mobile terminals 142 registered in the subject management table, it can also calculate the degree of congestion (overcrowding) by dividing the number of people occupying each room Ai by the room capacity (maximum number of people occupying the room). For this reason, the control unit 26 controls the ultraviolet light irradiation by setting a target level according to the degree of congestion of the room Ai obtained as an observation result by the observation unit 25. For example, the target level at a degree of congestion of 100%, where the number of people occupying the room matches the room capacity, is set as a reference value, and when the degree of congestion exceeds 100%, the target level is set higher than the reference value, and when the degree of congestion falls below 100%, the target level is set lower than the reference value, thereby enabling irradiation of ultraviolet light appropriate for the degree of congestion.

[0187] [k. Facility management system that monitors usage status via short-range wireless communication on mobile devices] Next, a facility management system that monitors the usage status within a target area based on short-range wireless communication between mobile terminals will be described in detail.

[0188] As shown in Fig. 20, a facility management device 24 is installed in an office building, which is a target facility, and an ultraviolet irradiation source 12 and an illuminance sensor 20 are placed in a room Ai, which is a monitoring area. Similar to the embodiment in Fig. 1, the facility management device 24 is provided with the functions of an observation unit 25, a control unit 26, and a monitor unit 28, each of which realizes the functions described above.

[0189] In addition, the observation unit 25 of the facility management device 24 observes the usage status within the target area based on short-range wireless communication of the mobile terminal 142. The mobile terminal 142 is equipped with a short-range wireless communication function such as Bluetooth (registered trademark). A short-range wireless adapter 150 is installed in the room Ai, enabling short-range wireless communication with the mobile terminal 142. The short-range wireless adapter 150 periodically transmits a predetermined beacon signal using radio waves with a strength that ensures a communication range within the room Ai.

[0190] When mobile terminal 142 receives a beacon signal from short-range wireless adapter 150, it transmits a beacon response signal including its own terminal identification information. When short-range wireless adapter 150 receives the beacon response signal from mobile terminal 142, it transmits the terminal identification information of mobile terminal 142 to facility management device 24 connected via transmission path 39. Based on the terminal identification information received from short-range wireless adapter 150, observation unit 25 of facility management device 24 generates an observation result indicating the usage status, for example, whether or not a person is present, for each room Ai that is a target area.

[0191] To explain the generation of the target person information in more detail, when the observation unit 25 receives the terminal identification information of the mobile terminal 142 from the short-range wireless adapter 150, the observation unit 25 generates target person information indicating the people for each room Ai by registering the information in the target person management table in memory for each room Ai. If the information is already registered, the information is updated by overwriting. Furthermore, if the terminal identification information of a registered mobile terminal 142 is not updated and registered for a predetermined period of time, the observation unit 25 determines that the mobile terminal 142 does not exist in the room Ai and deletes the registration. As a result, the observation unit 25 calculates, for example, the number of people present in the room from the number of pieces of terminal identification information of the mobile terminals 142 registered for each room Ai in the target person management table as target person information, and generates an observation result indicating the presence or absence of people in the room.

[0192] When the control unit 26 of the facility management device 24 determines that the irradiation start conditions are met based on the observation results indicating the usage status of the room Ai, for example, whether or not a person is present, generated by the observation unit 25 from the information of the short-range wireless communication of the mobile terminal 142, the control unit 26 controls the irradiation of ultraviolet rays from the ultraviolet irradiation source 12 to inactivate pathogens so that the cumulative irradiation level received by the irradiation target reaches a predetermined target level.

[0193] In addition, since the observation unit 25 can determine the number of people present in each room Ai from the number of terminal identification information of the mobile terminals 142 registered in the subject management table, it can calculate the degree of congestion by dividing the number of people present by the capacity (maximum number of people present) of each room Ai, and as described above, control the irradiation of ultraviolet rays according to the degree of congestion.

[0194] [l. Facility management system that monitors usage status based on the operation information of office automation equipment] Next, a facility management system that monitors the usage status within a target area based on the operation information of office automation equipment will be described in detail.

[0195] As shown in Fig. 21, a facility management device 24 is installed in an office building, which is a target facility, and an ultraviolet irradiation source 12 and an illuminance sensor 20 are placed in a room Ai, which is a monitoring area. Similar to the embodiment in Fig. 1, the facility management device 24 is provided with the functions of an observation unit 25, a control unit 26, and a monitor unit 28, each of which realizes the functions described above.

[0196] In addition, the observation unit 25 of the facility management device 24 observes the usage status within the target area based on the operation information of the office automation equipment 152. Office automation equipment 152 such as a personal computer, a printer, a copier, and a facsimile machine is installed in the room Ai that is the target area, and the office automation equipment 152 is connected to a server 154 via a LAN line 35.

[0197] Once the server 154 is turned on, it operates continuously 24 hours a day. In contrast, the office automation equipment 142, such as a personal computer, printer, copier, or facsimile, is activated when a person comes to work in the room Ai and turns it on, and when the person leaves the room at the end of their working hours, they shut down the power and cease operation.

[0198] When OA device 152 is powered on and starts operating, the powered-on OA device 152 is registered in the network-connected devices managed by server 154 via LAN line 35, and can be viewed on the screen as a network-connected device icon. Also, when OA device 152 is shut down and its operation is terminated, the connection registration of the shut-down OA device 152 is deleted from the network connection information managed by server 154.

[0199] The facility management device 24 is also connected to a LAN line 35, and the observation unit 25 of the facility management device 24 acquires operating terminal identification information based on the network connection of the OA equipment 152 from the server 154, and generates observation results indicating the usage status of the room Ai, for example, whether or not someone is present.

[0200] More specifically, when server 154 determines that OA device 152 is connected to the network upon power-on, it transmits operating terminal identification information indicating the operation of network-connected OA device 152 to facility management device 24. When observation unit 25 of facility management device 24 receives the operating terminal identification information of OA device 152 from server 154, it registers the information in the target user management table in memory for each room Ai. Note that if the information has already been registered, it is updated by overwriting.

[0201] Furthermore, when server 154 determines that the network connection has been disconnected due to a power shutdown of OA device 152, it transmits stopped-operation terminal identification information indicating the stoppage of operation of network-connected OA device 152 to facility management device 24. When observation unit 25 of facility management device 24 receives the stopped-operation terminal identification information of OA device 142 from server 154, it deletes the corresponding operating terminal identification information registered in the target user management table in memory.

[0202] As a result, the observation unit 25 generates an observation result indicating, for example, whether or not a person is present as the usage status of the room Ai based on the number of pieces of operating terminal identification information registered for each room Ai in the subject management table.

[0203] When the control unit 26 of the facility management device 24 determines that the irradiation start conditions are met based on the observation results indicating the usage status of the room Ai, for example, whether or not a person is present, generated by the observation unit 25 from the operation information of the OA equipment 152, the control unit 26 controls the irradiation of ultraviolet rays from the ultraviolet irradiation source 12 to inactivate pathogens so that the cumulative irradiation level received by the irradiation target reaches a predetermined target level.

[0204] Furthermore, since the number of people present in each room Ai can be determined from the number of pieces of operation information of the OA devices 152 registered in the subject management table, the observation unit 25 may calculate the degree of congestion by dividing the number of people present by the capacity (maximum number of people present) of each room Ai, and may control the irradiation of ultraviolet light according to the degree of congestion, as described above. Note that operation information of other devices than OA devices, such as lighting equipment, can also be applied in a similar manner.

[0205] [m. Modifications of the present invention] (Observation section) The facility management system of the above embodiment generates observation results indicating the presence or absence of people and the degree of congestion in rooms, etc. of the facility based on human presence sensors, location information and communication signals of mobile devices, and operation information of office automation equipment, but is not limited to these and can include any appropriate means that makes it possible to observe the usage status of the target area, such as detecting the opening and closing of the entrance and exit doors of the room, turning the room light switches on and off, and mat sensors (pressure sensors) installed at the entrance and exits of the room.

[0206] (UV irradiation source) The above embodiment takes as an example an ultraviolet irradiation source using an excimer lamp, but is not limited to this and includes any ultraviolet irradiation source, such as an ultraviolet LED that emits ultraviolet light in the 222 nm band.

[0207] (254nm or 265nm band ultraviolet radiation control) The above embodiment has been described as an example of irradiating ultraviolet light in the 222 nm band, which is highly effective in inactivating pathogens and is harmless to the human body. However, in another embodiment, when irradiating ultraviolet light in the 254 nm or 265 nm band, which is highly effective in inactivating pathogens and is harmful to the human body, the irradiation start condition is to control the irradiation of ultraviolet light when it is determined that no one is present.

[0208] (Ultraviolet irradiation control device) In the above embodiment, the facility management device 24 is provided with the functions of the observation unit 25, control unit 26, and monitor unit 28, but this does not prevent the observation unit 25, control unit 26, and monitor unit 28 from being provided in separate devices that are connected by communication, or in devices of other systems installed in the target facility.

[0209] (others) Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values ​​shown in the above embodiments. [Explanation of symbols]

[0210] 10: Door 12: Ultraviolet irradiation source 14: Electric lock 16: Card reader 18: Open / close detector 20: Illuminance sensor 22: Relay device 24: Facility management device 25: Observation Department 26: Control unit 28: Monitor section 30: Entrance / exit control device 31: Central device 32: Client device 35: LAN line 46: Drive circuit section 48: Lamp unit 50: Dimming control unit 52: Commercial AC source 54: AC / DC converter 56: High frequency oscillator 60: Excimer lamp 62:Outer tube 64: Inner tube 66:Metal mesh electrode 68: Metal electrode 74: Lamp cover 76: Cooling block 78: Mirror 80: Quartz window 82: UV light receiving unit 84: Sensor control unit 86,92: Communications Department 88,90: Antenna 94: Relay control unit 96: Transmission section 98: Irradiation level processing section 100: Irradiation start condition judgment section 102: Timer 104: Target level setting section 105: Irradiation level integrator 106: Target irradiation period calculation unit 108: Comparison section 112: Irradiation period setting unit 114: Target exposure level setting unit 116: Deviation calculation unit 118: Output section 120: UV radiation map screen 122: Entrance area 124: First office area 126: Second office area 128: Reception area 130: Conference area 132: Control table 140: Human sensor 142: Mobile terminal 144:Base station 146: Network 148: Mobile device management server 150: Short-range wireless adapter 152:OA equipment 154: Server

Claims

1. a light irradiation source that irradiates light in a wavelength band that inactivates a predetermined pathogen into the target area; an observation unit that observes an illumination level of the light received by an illumination target within the target area by irradiating the light from the light irradiation source; a control unit that irradiates the light from the light irradiation source when a predetermined irradiation start condition is met, and controls the irradiation level and / or irradiation period of the light based on the irradiation level observed by the observation unit during the irradiation of the light so that an integrated irradiation level obtained by integrating the irradiation level over time becomes a predetermined target level that inactivates the pathogens to a predetermined inactivation target; Equipped with The control unit If the predetermined irradiation start condition is not satisfied, the light is irradiated from the light irradiation source every time a predetermined time elapses, and the irradiation level and / or irradiation period of the light is controlled so that the integrated irradiation level received by the irradiation target becomes the target level; a facility management system that starts irradiating the light from the light irradiation source at a fixed predetermined irradiation level when the predetermined irradiation start condition is met, determines an irradiation stop timing for stopping the irradiation of the light based on the irradiated level and the target level observed by the observation unit during the irradiation of the light, and controls to stop the irradiation of the light when the irradiation stop timing arrives.

2. The facility management system according to claim 1, The control unit determines that the timing to stop irradiation has arrived when an integrated irradiation level, obtained by integrating the irradiation level observed by the observation unit over time during irradiation of the light, reaches the target level, and stops the irradiation of the light.

3. The facility management system according to claim 1, the control unit calculates a target irradiation period by dividing the target level by the irradiation level observed by the observation unit at a predetermined timing immediately after the start of the light irradiation, and when the elapsed period since the start of the light irradiation reaches the target irradiation period, determines that the timing to stop irradiation has arrived and stops the light irradiation.

4. a light irradiation source that irradiates light in a wavelength band that inactivates a predetermined pathogen into the target area; an observation unit that observes an illumination level of the light received by an illumination target within the target area by irradiating the light from the light irradiation source; a control unit that irradiates the light from the light irradiation source when a predetermined irradiation start condition is met, and controls the irradiation level and / or irradiation period of the light based on the irradiation level observed by the observation unit during the irradiation of the light so that an integrated irradiation level obtained by integrating the irradiation level over time becomes a predetermined target level that inactivates the pathogens to a predetermined inactivation target; Equipped with The control unit If the predetermined irradiation start condition is not satisfied, the light is irradiated from the light irradiation source every time a predetermined time elapses, and the irradiation level and / or irradiation period of the light is controlled so that the integrated irradiation level received by the irradiation target becomes the target level; a facility management system that starts irradiating the light from the light irradiation source when the predetermined irradiation start condition is met, calculates a target irradiation level to be received by the irradiation object based on a predetermined irradiation period and the target level, controls the irradiation level of the light irradiation source so that the irradiation level observed by the observation unit during the irradiation of the light becomes the target irradiation level, and when the elapsed period since the start of the light irradiation reaches the predetermined irradiation period, determines that the irradiation stop timing has arrived and stops the irradiation of the light.

5. The facility management system according to any one of claims 1 to 4, A facility management system characterized in that the control unit controls the irradiation level and / or irradiation period of the light so that the accumulated irradiation level received by the irradiation object becomes a predetermined target level set according to the purpose of use within the target area and / or the infection risk of the pathogen.

6. The facility management system according to any one of claims 1 to 5, The control unit divides the target area as the irradiation target into a plurality of small areas according to the intended use, and controls the light irradiation level and / or irradiation period using the light irradiation source provided for each small area so that the accumulated irradiation level received by the small area reaches a predetermined target level set according to the intended use of the small area and / or the infection risk of the pathogen.

7. The facility management system according to any one of claims 1 to 6, the observation unit observes the irradiation level received by the irradiation target at a plurality of points within the target area; A facility management system characterized in that the control unit controls the light irradiation level and / or irradiation period based on the minimum or average value of the irradiation levels of multiple points observed by the observation unit so that the accumulated irradiation level received by the irradiation object becomes the target level.

8. The facility management system according to any one of claims 1 to 7, The observation unit further observes a usage status within the target area, The control unit starts irradiating light from the light irradiation source when the usage status within the target area observed by the observation unit satisfies a predetermined irradiation start condition, and controls the irradiation level and / or irradiation period of the light so that the accumulated irradiation level received by the irradiation target becomes the target level.

9. The facility management system according to claim 8, the observation unit observes the entry and exit of people into the target area as the usage status of the target area; The control unit is characterized in that when a person enters the target area and / or when a person leaves the target area, the control unit irradiates the light from the light irradiation source and controls the irradiation level and / or irradiation period of the light so that the accumulated irradiation level received by the irradiation target becomes the target level.

10. The facility management system according to claim 8, The observation unit observes a degree of congestion of people within the target area as a usage status within the target area, A facility management system characterized in that the control unit controls the light irradiation level and / or irradiation period so that the accumulated irradiation level received by the irradiation target becomes a predetermined target level set according to the degree of congestion of people observed by the observation unit.

11. The facility management system according to any one of claims 8 to 10, A facility management system characterized in that the observation unit observes the usage status within the target area based on control information of the electric lock on the door installed at the entrance / exit of the target area.

12. The facility management system according to any one of claims 8 to 10, A facility management system characterized in that the observation unit observes the usage status within the target area based on detection information from a human presence sensor installed in the target area.

13. The facility management system according to any one of claims 8 to 10, A facility management system characterized in that the observation unit observes the usage status within the target area based on location information or a predetermined communication signal of a mobile device held by a person who enters the target area.

14. The facility management system according to any one of claims 8 to 10, A facility management system characterized in that the observation unit observes the usage status within the target area based on operation information of equipment installed in the target area.

15. The facility management system according to any one of claims 1 to 14, the observation unit includes an illuminance sensor that observes the irradiation of the light, The illuminance sensor A battery power source; a light receiving element that receives light from the light irradiation source and converts the light into an electrical signal; a processing unit that processes the electrical signal output from the light receiving element and outputs a signal including the illuminance; a communication unit that transmits a signal including the illuminance output from the processing unit to the control unit; A facility management system comprising:

16. The facility management system according to any one of claims 1 to 15, further comprising: a monitor unit that notifies the irradiation status of the light within the target area; A facility management system characterized in that the monitor unit notifies the light irradiation status within the target area based on the light irradiation level received by the illuminated object within the target area observed by the observation unit.

17. The facility management system according to claim 16, The facility management system is characterized in that the monitor unit divides the target area into small areas according to the purpose of use and notifies the illumination status of the light.

18. The facility management system according to claim 16, The facility management system is characterized in that the monitor unit notifies the illumination status of the light using map information showing the target area.

19. The facility management system according to any one of claims 16 to 18, The facility management system is characterized in that the monitor unit notifies guidance information for the target area based on the illumination status of the light observed within the target area.

20. 20. The facility management system according to claim 19, A facility management system characterized in that the monitor unit reports, as the guidance information, information indicating at least one of the safety of the target area, excessive or insufficient light irradiation in the target area, prohibition of use of the target area, or restrictions on use of the target area.

21. The facility management system according to any one of claims 1 to 20, A facility management system characterized in that the light is ultraviolet light in a predetermined wavelength band that includes a wavelength of 222 nm and excludes wavelengths of 254 nm and 264 nm.

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