JP2018105117A - Toilet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toilet device capable of suppressing the growth of bacteria peculiar to a toilet device.SOLUTION: A toilet device is provided in which a bowl portion of a toilet bowl having a photocatalytic film formed thereon is provided with a light source device for irradiating ultraviolet rays. The light source device executes the first irradiation mode in which ultraviolet rays having an irradiation intensity of 150 micro watts/square centimeter or more are irradiated to at least one portion of the bowl portion when the toilet bowl is used and executes the second irradiation mode in which ultraviolet rays having an irradiation intensity lower than the irradiation intensity in the first irradiation mode are irradiated to the bowl portion when the use of the toilet bowl is not confirmed during the period from the use of the toilet bowl until the predetermined time has elapsed.SELECTED DRAWING: Figure 1

Description

  Aspects of the invention generally relate to toilet devices.

  In order to keep the toilet more clean, there is a toilet in which a photocatalyst layer is formed on the surface of a toilet bowl (Patent Document 1). The toilet surface on which the photocatalyst layer is formed has hydrophilicity when the surface of the photocatalyst layer is excited by receiving the energy of ultraviolet rays. Thereby, a water film is formed on the toilet surface with relatively little water, and it is possible to reduce the adhesion of dirt to the toilet surface.

  In addition, on the surface of the photocatalyst layer that has received the energy of ultraviolet rays, the organic matter that contacts the photocatalyst layer is decomposed. Therefore, it is possible to decompose the nutrients necessary for the inhabiting of the fungus or to stop the fungal activity. That is, an antibacterial effect or a bactericidal effect is obtained.

  However, toilets are generally installed indoors. For this reason, sunlight cannot be used during the irradiation of ultraviolet rays. Therefore, in order to irradiate the toilet with the photocatalyst layer formed on the toilet surface, it is necessary to provide a light source device capable of irradiating the toilet. Therefore, there is a toilet bowl with a sterilizing function in which a sterilizing lamp for sterilizing the inside of the toilet bowl is provided in the nozzle of the local cleaning device (Patent Document 2). The germicidal lamp of the toilet bowl with a germicidal function described in Patent Document 2 is composed of an ultraviolet LED and can irradiate ultraviolet rays.

  The property of hydrophilicity is manifested by irradiating ultraviolet rays having relatively weak intensity in a relatively short time. The hydrophilic state is maintained for a certain time even when the irradiation of ultraviolet rays is stopped. For this reason, the performance of the light source device is not so required as long as it is only for exhibiting hydrophilicity. In addition, since the number of times the light source device is used is limited, a long life can be achieved.

  On the other hand, the antibacterial effect or the bactericidal effect correlates with the irradiation intensity and irradiation time of the ultraviolet rays to be irradiated, and increases as the irradiation intensity and irradiation time increase. Therefore, an antibacterial effect or a bactericidal effect cannot be obtained unless ultraviolet rays having an effective intensity are applied to bacteria unique to the toilet device (for example, heterotrophic bacteria such as methylobacterium). If an antibacterial effect or a bactericidal effect is not obtained, bacteria will propagate on the surface of the photocatalyst. As a result, a film composed of bacteria and bacteria metabolites called biofilms is formed, and the antibacterial or bactericidal effects of the photocatalyst may not be exhibited.

JP 2006-316607 A JP 2007-170051 A

  This invention is made | formed based on recognition of this subject, and it aims at providing the toilet apparatus which can suppress the proliferation of the microbe peculiar to a toilet apparatus.

   1st invention is equipped with the light source device which irradiates an ultraviolet-ray to the bowl part which was a bowl part of the toilet bowl in which the photocatalyst film was formed, and when the said toilet bowl is used, the said light source apparatus is 150 microwatts / square centimeter or more The first irradiation mode for irradiating at least one part of the bowl part with ultraviolet light having an irradiation intensity of the above is executed, and the use of the toilet is performed after a predetermined time elapses after the use of the toilet If not confirmed, the toilet device executes a second irradiation mode in which the bowl portion is irradiated with ultraviolet rays having an irradiation intensity lower than the irradiation intensity in the first irradiation mode. It is.

According to this toilet device, it is possible to suppress the growth of bacteria unique to the toilet device (for example, heterotrophic bacteria such as methylobacterium). Thereby, the toilet cleaning device which has a clean bowl part can be provided which reduces the cleaning burden of a toilet bowl.
Moreover, according to this toilet apparatus, whenever a toilet bowl is used, an ultraviolet-ray is irradiated to the surface of a bowl part. Therefore, the growth of bacteria can be further suppressed. Thereby, the toilet cleaning device which has a clean bowl part can be provided which reduces the cleaning burden of a toilet bowl.
Moreover, according to this toilet apparatus, since an ultraviolet-ray is irradiated regularly, the excitation state of a photocatalyst film can be maintained and the hydrophilic property of a photocatalyst film can be maintained. Moreover, since the irradiation mode (2nd irradiation mode) for exhibiting the hydrophilic property of a photocatalyst film | membrane is provided, the efficient irradiation according to a use can be performed. As a result, the life of the light source device can be extended.

  According to a second invention, in the first invention, the light source device irradiates the draft portion around the pooled water formed in the bowl portion with the ultraviolet light in the first irradiation mode. It is a toilet device.

  According to this toilet apparatus, ultraviolet rays having a predetermined irradiation intensity are irradiated to a draft portion where bacteria unique to the toilet apparatus (for example, heterotrophic bacteria such as methylobacterium) are likely to grow. Therefore, the growth of bacteria can be suppressed. Thereby, the toilet cleaning device which has a clean bowl part can be provided which reduces the cleaning burden of a toilet bowl.

  A third invention is the toilet apparatus according to the first or second invention, wherein the light source device emits ultraviolet rays having an irradiation intensity of 633 microwatts / square centimeter or less.

  According to this toilet device, it is possible to suppress the influence on the human body due to the temperature rise of the toilet lid that occurs when the light source device irradiates ultraviolet rays.

  A fourth aspect of the invention is the toilet apparatus according to any one of the first to third aspects of the invention, further comprising an ejection portion that ejects water to the surface of the bowl portion before the toilet is used. is there.

  According to this toilet apparatus, a water film is formed on the surface of the bowl portion due to the hydrophilicity of the photocatalyst film. Therefore, it can suppress that the filth containing a lot of bacteria adheres to the surface of a bowl part. Thereby, the irradiation time in the first irradiation mode can be shortened, and the life of the light source device can be extended.

  According to a fifth invention, in any one of the first to fourth inventions, the light source device further comprises a size discriminating means for discriminating between use of stool excretion and use of urine excretion. The toilet device is characterized in that the first irradiation mode is executed when the size determination means determines that the use of the toilet is the use of excretion of the stool.

  According to this toilet device, the light source device irradiates the bowl portion with ultraviolet rays after the excretion of stool, in which filth containing bacteria and organic matter that serves as nutrients for the bacteria adheres to the surface of the bowl portion. Therefore, it is possible to efficiently execute the first irradiation mode, efficiently decompose the organic matter that becomes the nutrient of the fungus, and further suppress the growth of the fungus. As a result, the life of the light source device can be extended. Thereby, a clean toilet bowl can be maintained for a long time.

  According to the aspect of the present invention, there is provided a toilet device capable of suppressing the growth of bacteria unique to the toilet device.

It is typical sectional drawing showing the toilet apparatus concerning embodiment of this invention. It is a block diagram showing the principal part structure of the toilet apparatus concerning this embodiment. It is a typical sectional view which illustrates an example of a photocatalyst layer. It is the typical top view which looked at the toilet bowl of this embodiment from upper direction. It is a graph which illustrates an example of the relationship between the irradiation intensity | strength of an ultraviolet-ray, and the number of microbes of a methylobacterium. It is a graph which illustrates an example of the relationship between the irradiation intensity of an ultraviolet-ray, and the number of bacteria of Escherichia coli. It is a graph which illustrates an example of the relationship between the irradiation intensity | strength of an ultraviolet-ray, and the amount of organic substance decomposition. It is a graph which illustrates another example of the relationship between the irradiation intensity | strength of an ultraviolet-ray, and the amount of organic substance decomposition | disassembly. It is a graph which illustrates an example of the relationship between the irradiation intensity | strength of an ultraviolet-ray, and water film formation. It is a typical top view explaining the examination method which this inventor examined about the hydrophilic effect | action of a photocatalyst layer. It is a graph which illustrates an example of the measurement result of the temperature distribution of the space enclosed with the toilet bowl and the toilet lid. It is a timing chart figure which illustrates the example of operation of the toilet device concerning this embodiment. It is a schematic diagram which illustrates the specific example of operation | movement of the toilet apparatus concerning this embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
FIG. 1 is a schematic sectional view showing a toilet apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a main configuration of the toilet apparatus according to the present embodiment.
FIG. 3 is a schematic cross-sectional view illustrating an example of the photocatalyst layer.
In addition, FIG. 2 represents together the principal part structure of the waterway system and the electrical system.

  The toilet apparatus 10 shown in FIG. 1 includes a Western-style seat toilet (hereinafter simply referred to as “toilet” for convenience of explanation) 800 and a sanitary washing device 100 provided thereon. The sanitary washing device 100 includes a casing 400, a toilet seat 200, and a toilet lid 300. The toilet seat 200 and the toilet lid 300 are pivotally supported with respect to the casing 400 so as to be freely opened and closed. However, the casing 400 is not necessarily provided. For example, the toilet seat 200 and the toilet lid 300 may be pivotally supported with respect to the toilet bowl 800 so as to be freely opened and closed.

The toilet bowl 800 has a bowl portion 801. In the state where the toilet lid 300 is closed, the bowl portion 801 is covered with the toilet lid 300. A photocatalyst layer (also referred to as “photocatalyst film”) 803 is formed on the surface of the bowl portion 801.
In the present specification, “photocatalyst” refers to a substance that promotes at least one of an oxidizing action and a reducing action when irradiated with light. As a result, the decomposition action that decomposes organic matter such as odorous substances that become nutrients of the fungus, the hydrophilic action that the surface easily gets wet with water, the antibacterial action that suppresses the growth of the fungus or stops the fungus activity, and kills the fungus Bactericidal action to be obtained. The bowl portion 801 in which the photocatalyst layer 803 is formed can suppress the adhesion of dirt, decompose the dirt, and easily remove the adhered water scale, thereby reducing the cleaning burden of the toilet 800 and maintaining a clean toilet 800 can do.

  Specifically, when the surface of the bowl portion 801 on which the photocatalyst layer 803 is formed is irradiated with ultraviolet rays, active oxygen is generated on the surface of the bowl portion 801 due to the ultraviolet rays and water or oxygen in the air. The active oxygen decomposes dirt, germs, bacteria, odorous substances and the like attached to the surface of the bowl portion 801. The active oxygen also decomposes volatile organic compounds (VOC) and the like. Therefore, antibacterial or sterilization, antifouling and deodorization of the surface of the bowl portion 801 can be performed by the decomposition action of the photocatalyst.

  Further, when the surface of the bowl portion 801 on which the photocatalyst layer 803 is formed is irradiated with ultraviolet rays, a hydrophilic group (—OH) due to bonding with surrounding water appears on the surface. Thereby, the surface of the bowl part 801 becomes familiar with water and becomes easy to get wet (hydrophilic action). That is, water droplets are not formed on the surface of the bowl portion 801, and water spreads on the surface. Then, by making the surface of the bowl portion 801 hydrophilic in advance, the dirt adheres to the surface of the water wet and spread on the surface of the bowl portion 801. Further, the cleaning water used for cleaning the bowl portion 801 enters between the surface of the bowl portion 801 and the dirt attached to the surface, and floats away the dirt. Therefore, the surface of the bowl portion 801 can be prevented from being soiled or fogged by the hydrophilic action of the photocatalyst.

  According to these, the effects of hydrophilicity exhibited by excitation of the photocatalyst by irradiation of ultraviolet rays, the decomposition effect of organic matter that becomes nutrients of the fungus, and the antibacterial effect or bactericidal effect of the fungus are obtained. Dirty and deodorizing can be performed. As such a “photocatalyst” material, for example, a metal oxide can be used. Examples of such an oxide include titanium oxide (TiOx), zinc oxide (ZnOx), tin oxide (SnOx), and zirconium oxide (ZrOx). Among these, in particular, titanium oxide is active as a photocatalyst, and is excellent in terms of stability and safety.

  In the present specification, “ultraviolet light” refers to light having a wavelength of about 388 nm or less. The photocatalytic layer 803 of this embodiment has a characteristic of absorbing more ultraviolet rays having a wavelength of about 388 nm or less. That is, the photocatalyst layer 803 of this embodiment is excited when irradiated with ultraviolet rays having a wavelength of about 388 nm or less, and exhibits photocatalytic activity.

For example, as illustrated in FIG. 3, the photocatalytic layer 803 includes a barrier layer 803a and a functional layer 803b. For example, a TiO ₂ / ZrO ₂ -based catalyst fired film is used as the photocatalyst layer 803. For example, the mixing ratio of TiO ₂ and ZrO ₂ in the barrier layer 803a is different from the mixing ratio of TiO ₂ and ZrO ₂ in the functional layer 803b. However, the photocatalyst layer 803 shown in FIG. 3 is an example. The photocatalyst layer 803 of the present embodiment is not limited to this.

  As shown in FIG. 1, the toilet lid 300 includes a light source device 310. The light source device 310 is provided inside the toilet lid 300. However, the installation form of the light source device 310 is not limited to this. For example, the light source device 310 may be provided inside the casing 400 or may be attached to the surface of the casing 400. The light source device 310 can irradiate the bowl portion 801 with ultraviolet rays. For example, a cold cathode tube or an LED (Light Emitting Diode) is used as the light source device 310.

  As shown in FIG. 2, for example, inside the casing 400, a control unit (size discrimination means) 410, an entrance detection sensor 402, a human body detection sensor 403, a seating detection sensor 404, and a toilet lid opening / closing detection sensor 405 are provided. And a toilet lid opening / closing drive device 420 are provided. The control unit 410 transmits a control signal based on a detection signal transmitted from, for example, the room entry detection sensor 402, the human body detection sensor 403, or the seating detection sensor 404, and controls the operation of the toilet lid opening / closing drive device 420 or the light source device 310. be able to.

  The entrance detection sensor 402 can detect a user immediately after opening a toilet room door or entering a toilet room and a user existing in front of the door trying to enter the toilet room. That is, the entrance detection sensor 402 can detect not only a user who has entered the toilet room, but also a user before entering the toilet room, that is, a user existing in front of the door outside the toilet room. As such a room entry detection sensor 402, a pyroelectric sensor, a microwave sensor such as a Doppler sensor, or the like can be used. When using a sensor that uses the microwave Doppler effect or a sensor that detects the object to be detected based on the amplitude (intensity) of the microwave transmitted and reflected, the user's The presence can be detected. That is, the user before entering the toilet room can be detected.

  The human body detection sensor 403 can detect a user in front of the toilet bowl 800, that is, a user present at a position spaced forward from the toilet seat 200. That is, the human body detection sensor 403 can detect a user who enters the toilet room and approaches the toilet seat 200. As such a human body detection sensor 403, for example, an infrared light projecting / receiving distance measuring sensor or the like can be used.

  The seating detection sensor 404 can detect a human body existing above the toilet seat 200 immediately before the user sits on the toilet seat 200 or a user seated on the toilet seat 200. In other words, the seating detection sensor 404 can detect not only a user seated on the toilet seat 200 but also a user existing above the toilet seat 200. As such a seating detection sensor 404, for example, an infrared light emitting / receiving distance measuring sensor or the like can be used.

The toilet lid opening / closing detection sensor 405 can detect the opening / closing state of the toilet lid 300. As the toilet lid opening / closing detection sensor 405, for example, a combination of a Hall IC and a magnet, a micro switch, or the like is used.
The toilet lid opening / closing drive device 420 can open and close the toilet lid 300 based on a signal transmitted from the control unit 410.

For example, the lower part of the casing 400 is provided with an ejection part 480 that sprays water or sterilized water on the surface of the bowl part 801 of the toilet bowl 800. The ejection part 480 may be provided inside the casing 400 or may be attached outside the casing 400.
In the present specification, “water” includes not only cold water but also heated hot water.

  As illustrated in FIG. 2, the toilet apparatus 10 according to the present embodiment includes the first flow path 21 that guides water supplied from a water supply source such as a water supply or a water storage tank to the ejection unit 480. An electromagnetic valve 431 is provided on the upstream side of the first flow path 21. The electromagnetic valve 431 is an electromagnetic valve that can be opened and closed, and controls the supply of water based on a command from the control unit 410 provided in the casing 400.

  Downstream of the electromagnetic valve 431, there is provided a flow control / flow path switching valve 471 that adjusts the water flow (flow rate) and opens / closes or switches the supply of water to the ejection unit 480 or a cleaning nozzle (not shown). The first flow path 21 is branched into a second flow path 22 and a third flow path 23 by a flow control / flow path switching valve 471. The sterilized water or clean water guided to the second flow path 22 passes through the flow control / flow path switching valve 471 and then is guided to the ejection unit 480 through the second flow path. On the other hand, the sterilizing water and clean water guided to the third flow path 23 are guided to, for example, a cleaning nozzle and a nozzle cleaning chamber (not shown). The flow control / flow path switching valve 471 guides the sterilized water or clean water to the second flow path 22 and the sterilized water or clean water to the third flow path 23 based on a command from the control unit 410. The state of guiding can be switched.

FIG. 4 is a schematic plan view of the toilet of this embodiment as viewed from above.
As shown in FIG. 4, a reservoir (sealed water) 805 is formed in the lower part of the bowl portion 801 of the toilet bowl 800 of the present embodiment. A draft portion 807 is formed around the upper surface of the stored water 805. In the specification of the present application, the “draft portion” refers to a portion around the upper surface (reserved water surface) of the stored water 805.

  For example, heterotrophic bacteria such as methylobacterium are unique to toilet devices. Examples of other bacteria that propagate in the toilet device include Escherichia coli and Pseudomonas aeruginosa. Proteins and carbohydrates that serve as nutrient sources (nutrients) for the growth of heterotrophic bacteria, Escherichia coli, Pseudomonas aeruginosa, and other bacteria are contained in the waste excreted by the user. Fungi grow by water and nutrient sources. Therefore, bacteria are likely to grow in the draft portion 807 in the bowl portion 801.

  In the specification of the present application, the upper side as viewed from the user sitting on the toilet seat 200 is “upper”, and the lower side as viewed from the user sitting on the toilet seat 200 is “lower”. In addition, the front is “front” when viewed from the user sitting on the toilet seat 200, and the rear is “back” when viewed from the user sitting on the toilet seat 200. Alternatively, the front side is “front” when viewed from the user standing in front of the toilet 800 facing the toilet 800, and the back side is viewed from the user standing in front of the toilet 800 facing the toilet 800. "Back".

  The antibacterial action or bactericidal action of the photocatalyst layer 803 correlates with the irradiation intensity and irradiation time of the ultraviolet rays to be irradiated, and becomes higher as the irradiation intensity and irradiation time increase. Therefore, the antibacterial action or bactericidal action of the photocatalyst layer 803 cannot be obtained unless ultraviolet rays having an effective intensity are applied to the bacteria unique to the toilet device such as heterotrophic bacteria. If an antibacterial action or a bactericidal action is not obtained, bacteria will propagate on the surface of the photocatalyst layer 803. Then, a relatively strong biofilm is formed on the surface of the photocatalyst layer 803. In some cases, due to the formation of a biofilm, the photocatalyst layer 803 may not exhibit hydrophilic performance, organic substance decomposition performance, antibacterial or bactericidal action of bacteria.

On the other hand, in the toilet apparatus 10 according to the present embodiment, the light source device 310 is an ultraviolet ray having an irradiation intensity of 150 microwatts / square centimeter (μW / cm ² ) or more in at least any part of the surface of the bowl portion 801. Is irradiated to the bowl portion 801 (first irradiation mode). Specifically, the light source device 310 irradiates the draft unit 807 with ultraviolet rays having an irradiation intensity of 150 μW / cm ² or more. That is, the ultraviolet ray with which the irradiation intensity in the draft unit 807 is 150 μW / cm ² or more is irradiated.
In addition, the irradiation intensity | strength of the ultraviolet-ray in this-application specification is defined as the value measured with the irradiation intensity meter. Therefore, in the above-mentioned case, it means that the irradiation intensity | strength measured with the irradiation intensity meter in the draft part 807 becomes 150 microwatts / cm < ² > or more.

According to this, it can suppress that the microbe peculiar to a toilet apparatus propagates. Specifically, ultraviolet rays having an irradiation intensity of 150 μW / cm ² or more are irradiated to the drafting portion 807 where heterotrophic bacteria such as methylobacterium are easy to grow, thereby suppressing the growth of heterotrophic bacteria. Can do. Thereby, the cleaning burden of the toilet bowl 800 can be reduced and the toilet apparatus which has the clean bowl part 801 can be provided.

  The decomposition action of the photocatalyst layer 803 correlates with the irradiation intensity and irradiation time of the ultraviolet rays to be irradiated, and becomes higher as the irradiation intensity and irradiation time increase. Therefore, when the organic matter is not decomposed and remains on the surface of the bowl portion 801 of the toilet bowl 800, the bacteria attached to the surface of the bowl portion 801 may grow by feeding the organic matter remaining on the surface of the bowl portion 801. .

Further, the present inventor has found that the filth excreted by the user is more likely to adhere to the rear part of the bowl part 801 than to the front part of the bowl part 801. Therefore, the light source device 310 irradiates the dirt adhesion region 808 shown in FIG. 4 with ultraviolet rays having an irradiation intensity of 100 μW / cm ² or more. That is, the ultraviolet light with which the irradiation intensity in the dirt adhesion region 808 is 100 μW / cm ² or more is irradiated. The filth adhesion region 808 is a region including the draft portion 807 and extending from the center portion of the bowl portion 801 to the rear portion.

According to this, the organic matter contained in the filth etc. and adhering to the bowl portion 801 can be decomposed. Since organic substances as nutrients (nutrient sources) can be decomposed, the growth of bacteria can be suppressed. Thereby, the toilet apparatus 10 which has the clean bowl part 801 can be provided over a long time. Moreover, since the ultraviolet-ray which has an irradiation intensity of 100 microwatts / cm < ² > or more is irradiated with respect to the drafting part 807 to which organic substance adheres easily, organic substance can be decomposed | disassembled efficiently. Thereby, the cleaning burden of the toilet bowl 800 can be reduced and the toilet apparatus which has the clean bowl part 801 can be provided.

  The hydrophilic action of the photocatalyst layer 803 is maintained for a certain time even when the irradiation of ultraviolet rays is stopped. Therefore, it is considered that the toilet apparatus 10 provided with the photocatalyst layer 803 is regularly irradiated with ultraviolet rays. However, considering the influence of the ultraviolet rays on the human body, it is desirable to avoid the irradiation of ultraviolet rays as much as possible when the user uses the toilet apparatus 10. Therefore, for example, in the toilet apparatus 10 having a relatively high use frequency such as a public facility, the time during which ultraviolet rays can be irradiated is limited. Therefore, effective ultraviolet irradiation is required.

Therefore, the light source device 310 irradiates the urine adhesion region 809 shown in FIG. 4 with ultraviolet rays having an irradiation intensity of 30 μW / cm ² or more. That is, the ultraviolet rays with which the irradiation intensity in the urine adhesion region 809 is 30 μW / cm ² or more are irradiated. The urine adhesion region 809 is a region in front of the bowl portion 801.

  According to this, the hydrophilicity of the photocatalyst layer 803 can be maintained in a relatively short irradiation time. Therefore, a clean toilet apparatus 10 can be provided for a long time in a toilet room with a relatively high frequency of use, such as a public facility.

Next, the result of examination of the irradiation intensity by the inventor will be described with reference to the drawings.
FIG. 5 is a graph illustrating an example of the relationship between the irradiation intensity of ultraviolet rays and the number of methylobacterium bacteria.
The horizontal axis of the graph shown in FIG. 5 represents irradiation intensity (μW / cm ² ) and elapsed time (hr: time). The vertical axis of the graph shown in FIG. 5 represents the number of methylobacterium.

The left group in the graph shown in FIG. 5 represents the number of bacteria when the elapsed time is zero hours (hr), that is, the initial number of bacteria. The right group in the graph shown in FIG. 5 represents the number of bacteria when the elapsed time is 48 hours.
The irradiation intensity “0” in the graph shown in FIG. 5 means that the photocatalyst layer 803 is not formed in the bowl portion 801. Therefore, when the irradiation intensity in the graph shown in FIG. 5 is “0”, ultraviolet irradiation is not performed.

  The inventor first attached methylobacterium having about 55,000 bacteria to the bowl portion 801. Methylobacterium may be attached to the tile (test piece). A photocatalytic layer 803 is formed on the surface of the tile at this time. That is, when using a tile in this study, the surface property of the tile is the same as the surface property of the bowl portion 801 of the present embodiment.

Subsequently, the present inventors have, 100 .mu.W ^/ cm 2 to a region including a portion with attached ^{Methylobacterium, 120μW / cm 2, 150μW /} cm 2, the ultraviolet radiation having an irradiation intensity of 200μW / cm ^2, respectively Irradiated for only 1 hour. Subsequently, the present inventor stopped the irradiation of ultraviolet rays and left the part to which methylobacterium was adhered as it was for 2 hours. Subsequently, the inventor irradiated each of the ultraviolet rays having the irradiation intensity described above for 1 hour. Thereafter, the present inventor repeated irradiation of ultraviolet rays and stopping (leaving) the ultraviolet rays, and measured the number of methylobacterium at the time when 48 hours had elapsed from the start of the examination.

The measurement results of the number of methylobacterium after 48 hours are as shown in the group on the right side of the graph of FIG. That is, the bowl portion 801 UV is irradiated with irradiation intensity of the bowl portion 801,100μW / cm ² photocatalyst layer 803 is not formed bowl portion 801 and ultraviolet radiation having an irradiation intensity of 120μW / cm ² is irradiated, Then, methylobacterium grew from the beginning. On the other hand, the bowl portion 801 UV is irradiated respectively with irradiation intensity of 150μW / cm ² and 200μW / cm ^2, the growth of Methylobacterium is suppressed.

Thereby, it turned out that the irradiation intensity | strength of an ultraviolet-ray effective in order to suppress the proliferation of methylobacterium (one of bacteria peculiar to a toilet apparatus) is 150 microwatts / cm < ² > or more.

FIG. 6 is a graph illustrating an example of the relationship between the irradiation intensity of ultraviolet rays and the number of E. coli bacteria.
The horizontal axis of the graph shown in FIG. 6 represents the irradiation intensity (μW / cm ² ). The vertical axis of the graph shown in FIG. 6 represents the number of E. coli bacteria.

  The present inventor first attached E. coli having about 30000 bacteria to the bowl portion 801. As described above with reference to FIG. 5, E. coli may be attached to the tile having the surface properties of the bowl portion 801 of the present embodiment.

Subsequently, the present inventors have, 30μW ^/ cm 2 to a region including a portion with attached ^{coliforms, 50μW / cm 2, 100μW /} cm 2, respectively 1 hour ultraviolet radiation having an irradiation intensity of 200μW / cm ² Only irradiated. Subsequently, the present inventor stopped the irradiation of ultraviolet rays, and left the part to which E. coli was adhered for 2 hours. Subsequently, the inventor irradiated each of the ultraviolet rays having the irradiation intensity described above for 1 hour. Thereafter, the present inventor repeated the irradiation of ultraviolet rays and the stopping (leaving) of the ultraviolet rays, and measured the number of E. coli bacteria when 48 hours had elapsed from the start of the study.

The measurement results of the number of E. coli bacteria after 48 hours are as shown in FIG. ^{That, 30μW / cm 2, 50μW /} cm 2, the bowl portion 801 UV is irradiated with a radiation intensity of 100 .mu.W / cm ² and 200μW / cm ^2, both coliforms were detected.
Thus, it was found that the irradiation intensity of ultraviolet rays effective for suppressing the growth of E. coli is 30 μW / cm ² or more.

FIG. 7 is a graph illustrating an example of the relationship between the irradiation intensity of ultraviolet rays and the decomposition amount of organic matter. The horizontal axis of the graph shown in FIG. 7 represents the amount of organic matter decomposition (μg / cm ² ). The vertical axis of the graph shown in FIG. 7 represents the irradiation intensity (μW / cm ² ).

The inventor first attached 5.2 μg / cm ² of protein to the bowl portion 801 as an initial nutrient amount (nutrient residual amount). Nutrients attached to the bowl portion 801 are nutrients for breeding bacteria such as heterotrophic bacteria, Escherichia coli, and Pseudomonas aeruginosa. Specifically, the nutrient used in this study is gelatin. As described above with reference to FIG. 5, nutrients may be attached to the tile having the surface properties of the bowl portion 801 of the present embodiment.

Subsequently, the present inventors have, 30μW ^/ cm 2 to a region including a portion with attached nutrients, 100 .mu.W ^/ cm 2, the ultraviolet radiation having an irradiation intensity of 200μW / cm ² was irradiated by each 1 hour. Subsequently, the present inventor stopped the irradiation of ultraviolet rays, and left the portion to which the nutrients were attached as it was for 2 hours. Subsequently, the inventor irradiated each of the ultraviolet rays having the irradiation intensity described above for 1 hour. Thereafter, the present inventor repeatedly irradiated the ultraviolet rays and stopped (left) the ultraviolet rays, and analyzed the amount of nutrient decomposition (organic matter decomposition amount) after 48 hours from the start of the study by Fourier transform infrared spectroscopy. FT-IR (Fourier Transform Infrared-Infrared Spectroscopy).

The measurement result of the organic matter decomposition amount after 48 hours is as shown in FIG. That is, organic decomposition amount in the bowl portion 801 UV is irradiated with a radiation intensity of 100 .mu.W / cm ² was 1.6 [mu] g / cm ^2. Organic decomposition amount of the bowl portion 801 UV is irradiated with irradiation intensity of 200μW / cm ² was 2.9μg / cm ^2. On the other hand, organic decomposition amount in the bowl portion 801 UV is irradiated with irradiation intensity of 30μW / cm ² was 0 Pg / cm ^2.

Thereby, it turned out that the irradiation intensity | strength of an ultraviolet-ray effective in order to decompose | disassemble the organic substance contained in filth etc. is 100 microwatt / cm < ² > or more.

FIG. 8 is a graph illustrating another example of the relationship between the irradiation intensity of ultraviolet rays and the decomposition amount of organic matter.
FIG. 8A shows the amount of organic matter decomposition (μg / cm ² ) when the irradiation intensity of ultraviolet rays is 100 μW / cm ² . FIG. 8B shows the amount of organic matter decomposition (μg / cm ² ) when the irradiation intensity of ultraviolet rays is 200 μW / cm ² .
The horizontal axis of the graphs shown in FIGS. 8A and 8B represents the initial nutrient amount (nutrient residual amount). The vertical axis of the graphs shown in FIGS. 8A and 8B represents the amount of organic matter decomposition (μg / cm ² ).

The inventor first produced a solution of gelatin as a nutrient. The initial nutrient amount of the resulting gelatin solution is 5.2 μg / cm ² , 7.8 μg / cm ² , 10.4 μg / cm ² , 15.6 μg / cm ² , 52.1 μg / cm ² , 72.9 μg. / Cm ² , 104.1 μg / cm ² . The inventor dropped a solution of gelatin of each nutrient amount into the bowl portion 801. As described above with reference to FIG. 5, the gelatin solution may be dropped onto the tile having the surface properties of the bowl portion 801 of the present embodiment.

Subsequently, the present inventors have, 100 .mu.W ^/ cm 2 to a region containing a solution dropping portion of the gelatin, the ultraviolet radiation having an irradiation intensity of 200μW / cm ² was irradiated by each 1 hour. Thereafter, the present inventor measured the amount of organic matter decomposition by Fourier transform infrared spectroscopy.

The measurement result of the organic matter decomposition amount when the irradiation intensity of ultraviolet rays is 100 μW / cm ² is as shown in FIG. That is, it was confirmed that when the irradiation intensity of ultraviolet rays is 100 μW / cm ² and the irradiation time is 1 hour, nutrients having an initial nutrient amount of 15.6 μg / cm ² or less can be decomposed.
The measurement result of the organic matter decomposition amount when the irradiation intensity of ultraviolet rays is 200 μW / cm ² is as shown in FIG. That is, it was confirmed that when the irradiation intensity of ultraviolet rays is 200 μW / cm ² and the irradiation time is 1 hour, nutrients having an initial nutrient amount of 52.1 μg / cm ² or less can be decomposed.

FIG. 9 is a graph illustrating an example of the relationship between ultraviolet irradiation intensity and water film formation.
FIG. 10 is a schematic plan view for explaining the examination method in which the present inventors have examined the hydrophilic action of the photocatalyst layer.
The horizontal axis of the graph shown in FIG. 9 is the elapsed time (hr). The vertical axis of the graph shown in FIG. 9 represents the contact angle (°).

  The present inventor prepared a tile 501 and water 505 in examining the hydrophilic action of the photocatalyst layer. A photocatalytic layer 803 is formed on the surface of the tile 501. That is, the property of the surface of the tile 501 of this examination is the same as the property of the surface of the bowl part 801 of this embodiment.

  Subsequently, as shown in FIG. 10, the inventor dropped water 505 on the surface of the tile 501. At this time, for example, nutrients as described above with reference to FIGS. 7 and 8 are not attached to the surface of the tile 501. The inventor measured the contact angle θ of the water 505 on the surface of the tile 501. The contact angle at this time is an initial contact angle before irradiation with ultraviolet rays.

  In the present specification, the “contact angle” means an angle formed by a solid surface and a liquid surface at an interface between a predetermined solid surface (the surface of the tile 501 in the present study) and the liquid surface (the surface of the water 505 in the present study). And the angle measured on the liquid side. Further, the contact angle θ was measured using a contact angle meter “Kyowa Interface Chemical Co., Ltd., automatic contact angle meter DM-500”.

Subsequently, the inventor irradiates the surface of the tile 501 with ultraviolet rays from the light source device 310. In this study, a cold cathode tube was used as the light source device 310. The present inventors have, 20 W ^/ cm 2 with respect to the surface of the tile ^{501, 30μW / cm 2, 100μW} / cm 2, were respectively irradiated ultraviolet radiation having an irradiation intensity of 200μW / cm ^2. As shown in FIG. 9, the first ultraviolet irradiation time is about 2 hours. The second UV irradiation time is about 1 hour.

As a result of the study by the present inventors, it has been found that a water film can be formed on the solid surface when the contact angle θ of water on the solid surface is 30 degrees or less. The measurement result of the contact angle θ is as shown in FIG. That is, when the irradiation intensity of ultraviolet rays was 20 μW / cm ² , the contact angle did not become 30 degrees or less even if the irradiation time of ultraviolet rays was long. That is, a water film could not be formed on the surface of the tile 501 when the ultraviolet irradiation intensity was 20 μW / cm ² .

On the other hand, when the irradiation intensity of ultraviolet rays is 30 μW / cm ² , 100 μW / cm ² and 200 μW / cm ² , the contact angle becomes 30 degrees or less when the irradiation time of ultraviolet rays is about 1 hour, and the irradiation time of ultraviolet rays However, it decreased further in about 2 hours. Thus, it was found that when an ultraviolet ray having an irradiation intensity of 30 μW / cm ² or more was irradiated for 1 hour or longer, a water film could be formed on the surface of the bowl portion 801 on which the photocatalytic layer 803 was formed.

Subsequently, the present inventor left the tile 501 on which the water 505 was dropped while the ultraviolet irradiation was stopped. Then, when the irradiation intensity of ultraviolet rays is 30 μW / cm ² , 100 μW / cm ² and 200 μW / cm ² , the contact angle is 30 degrees or less until about 10 hours elapse after the irradiation of ultraviolet rays is stopped. It turns out that the state can be maintained. That is, it was found that when the ultraviolet irradiation intensity is 30 μW / cm ² or more, the hydrophilicity of the photocatalyst layer 803 can be maintained until about 10 hours have passed after the ultraviolet irradiation is stopped.

Subsequently, after the contact angle became larger than 30 degrees, ultraviolet rays having an irradiation intensity of 30 μW / cm ² or more were again irradiated for 1 hour or more (second irradiation). Then, as shown in FIG. 9, the irradiation intensity of ultraviolet rays 30μW ^/ cm 2, in the case of 100 .mu.W / cm ² and 200μW / cm ^2, the contact angle is 30 degrees the irradiation time of ultraviolet rays about 1 hour It became the following. Thereby, it was found that the hydrophilicity of the photocatalyst layer 803 can be obtained again.

FIG. 11 is a graph illustrating an example of the measurement result of the temperature distribution in the space surrounded by the toilet bowl and the toilet lid.
The horizontal axis of the graph shown in FIG. 11 represents the time that has elapsed since the start of ultraviolet irradiation. The vertical axis of the graph shown in FIG. 11 represents the temperature difference before and after the irradiation with ultraviolet rays.

The inventor measured the temperature distribution of the space surrounded by the toilet bowl and the toilet lid by irradiating the surface of the bowl unit 801 with ultraviolet light from the light source device 310.
The room temperature when measuring the temperature distribution is 27.2 ° C. A photocatalytic layer 803 is formed on the surface of the bowl portion 801. The light source device 310 is provided on the back surface of the toilet lid 300 (the surface facing the seating surface of the toilet seat in the closed state), and has a cold cathode tube. The power of the cold cathode tube was set to 7.2 watts (W), and the irradiation intensity at the draft portion 807 was set to 200 μW / cm ² .

  The measurement result of the temperature distribution is as shown in FIG. That is, when 60 minutes have passed since the start of the ultraviolet irradiation, the temperature in the vicinity of the light source device 310 increased by about 7.2 ° C. On the other hand, when 60 minutes passed from the start of the ultraviolet irradiation, the temperatures of the toilet seat 200 surface, the bowl portion 801 surface, and the bowl portion 801 increased by about 1 ° C.

Here, according to the knowledge obtained by the present inventor, it is desirable to set the temperature of the toilet lid 300 to 50 ° C. or lower in consideration of the influence on the human body. The electric power required to raise the temperature of the toilet lid 300 to 50 ° C. in 60 minutes is expressed by the following equation.

(50 ° C.-27.2 ° C.) × 7.2 W / 7.2 ° C. = 22.8 W

Then, the irradiation intensity required to raise the temperature of the toilet lid 300 to 50 ° C. in 60 minutes is expressed by the following equation.

22.8W / 7.2W × 200 μW / cm ² = 633.3 μW / cm ²

Accordingly, in consideration of the influence on the human body, the light source device 310 can irradiate the bowl portion 801 with ultraviolet rays having an irradiation intensity of 633 μW / cm ² or less in at least any part of the surface of the bowl portion 801. desirable. Specifically, the light source device 310 desirably irradiates the draft unit 807 with ultraviolet rays having an irradiation intensity of 633 μW / cm ² or less. That is, in the present embodiment in which the light source device 310 is provided on the toilet lid 300, the influence of the heat of the light source device 310 on the toilet lid 300 is the largest. It is desirable to irradiate ultraviolet rays with an irradiation intensity of 633 μW / cm ² or less. According to this, the light source device 310 is provided in the installation mode in which the light source device 310 is provided in the casing 400, for example, regardless of the installation mode in which the light source device 310 is provided in the toilet lid 300 as in the present embodiment. Can suppress the influence on the human body due to the temperature rise of the toilet lid 300 caused by irradiating ultraviolet rays.

Next, a specific example of the operation of the toilet apparatus according to the present embodiment will be described with reference to the drawings.
FIG. 12 is a timing chart illustrating a specific example of the operation of the toilet apparatus according to this embodiment.
FIG. 13 is a schematic view illustrating a specific example of the operation of the toilet apparatus according to this embodiment.

  For example, when the user enters the toilet room, the entrance detection sensor 402 detects a human body entering the toilet room and transmits a signal to the control unit 410 (timing t1). Then, the toilet lid opening / closing drive device 420 opens the toilet lid 300 based on the signal transmitted from the control unit 410. Thereby, the toilet lid opening / closing detection sensor 405 detects that the toilet lid 300 is opened (timing t1).

  Subsequently, when a predetermined time elapses after the entrance detection sensor 402 detects a human body entering the toilet room, the electromagnetic valve 431 is opened based on a signal transmitted from the control unit 410. The flow control / flow path switching valve 471 switches to a state in which water is guided to the second flow path based on the signal transmitted from the control unit 410. Thereby, water is sprayed from the ejection part 480 to the surface of the bowl part 801 (timing t2 to t3). In addition, sterilizing water may be injected from the ejection part 480.

  According to this, since water is sprayed onto the surface of the bowl portion 801 before the user uses the toilet bowl 800, a water film is formed on the surface of the bowl portion 801 due to the hydrophilicity of the photocatalyst layer 803. Therefore, it is possible to prevent filth including organic matter from adhering to the surface of the bowl portion 801. In addition, it is possible to suppress bacteria unique to the toilet device such as methylobacterium from adhering to the surface of the bowl portion 801. Thereby, the irradiation time of ultraviolet rays (irradiation time in the first irradiation mode) can be shortened, and the life of the light source device 310 can be extended. When sterilizing water is sprayed on the surface of the bowl portion 801, the surface of the bowl portion 801 can be sterilized.

  Subsequently, when the user is seated on the toilet seat 200, the seating detection sensor 404 detects the user seated on the toilet seat 200 (timing t4). The user leaves the toilet seat 200 after finishing the excretion action. Then, the seating detection sensor 404 detects that the user is not seated on the toilet seat 200 and transmits a signal to the control unit 410 (timing t5).

  Here, the control part 410 can discriminate | determine the use of the excretion action of a stool and the use of the excretion action of a urine about the use of the toilet bowl 800 by a user. That is, the control unit 410 can determine whether the use of the toilet 800 by the user is the use of a stool excretion action or the use of a urine excretion action. For example, the controller 410 uses the toilet 800 by the user based on the presence / absence of human body detection of the seating detection sensor 404 and the detection time of the seating detection sensor 404 (sitting time of the user: timings t4 to t5). It is discriminated whether it is the use of excretion or the use of excretion of urine.

  Subsequently, when a predetermined time elapses after the seating detection sensor 404 detects that the user is not seated on the toilet seat 200, the electromagnetic valve 431 is opened based on a signal transmitted from the control unit 410. The flow control / flow path switching valve 471 switches to a state in which water is guided to the second flow path based on the signal transmitted from the control unit 410. Thereby, water is sprayed from the ejection part 480 to the surface of the bowl part 801 (timing t6 to t7). In addition, the timing at which water is sprayed from the ejection portion 480 to the surface of the bowl portion 801 is the timing after the filth is discharged from the bowl portion 801 by toilet flushing. Further, sterilizing water may be sprayed from the ejection part 480 to the surface of the bowl part 801.

  According to this, since water is jetted onto the surface of the bowl portion 801 after the user uses the toilet bowl 800, a water film is formed on the surface of the bowl portion 801 due to the hydrophilicity of the photocatalyst layer 803. Further, when the sterilizing water is sprayed on the surface of the bowl portion 801, the surface of the bowl portion 801 can be sterilized. According to this, a cleaner toilet 800 can be maintained.

  Subsequently, when the user leaves the toilet room, the room entry detection sensor 402 detects that no human body is present in the toilet room and transmits a signal to the control unit 410 (timing t8). When a predetermined time elapses after the entrance detection sensor 402 detects that no human body is present in the toilet room, the toilet lid opening / closing drive device 420 closes the toilet lid 300 based on the signal transmitted from the control unit 410. Thereby, the toilet lid opening / closing detection sensor 405 detects that the toilet lid 300 is closed (timing t9).

When the control unit 410 determines that the use of the toilet 800 by the user is the use of excretion of stool, when a predetermined time elapses after the toilet lid opening / closing detection sensor 405 detects that the toilet lid 300 is closed. The light source device 310 irradiates the bowl unit 801 with ultraviolet rays based on the signal transmitted from the control unit 410 (first irradiation mode: timings t10 to t11). The irradiation time of ultraviolet rays at timings t10 to t11 is, for example, about 1 to 2 hours. At this time, as described above with reference to FIG. 4, the light source device 310 irradiates the ultraviolet light whose irradiation intensity in the draft unit 807 is 150 μW / cm ² or more. In addition, the light source device 310 irradiates ultraviolet rays with an irradiation intensity of 100 μW / cm ² or more in the dirt adhesion region 808. Further, the light source device 310 irradiates the urine adhesion region 809 with ultraviolet rays having an irradiation intensity of 30 μW / cm ² or more in the urine adhesion region 809.

According to this, since ultraviolet rays having an irradiation intensity of 150 μW / cm ² or more are irradiated to the drafting unit 807 to which bacteria unique to a toilet device such as methylobacterium are likely to adhere, the growth of heterotrophic bacteria is prevented. Can be suppressed. Thereby, the cleaning burden of the toilet bowl 800 can be reduced and the toilet apparatus which has the clean bowl part 801 can be provided.

Further, since ultraviolet rays having an irradiation intensity of 100 μW / cm ² or more are irradiated to the draft portion 807 to which filth containing organic matter is likely to adhere, the organic matter can be efficiently decomposed. Thereby, the cleaning burden of the toilet bowl 800 can be reduced for a long time, and the toilet apparatus which has the clean bowl part 801 can be provided.

  The light source device 310 irradiates the surface of the bowl portion 801 with ultraviolet rays every time the toilet 800 is used. Therefore, organic substances can be efficiently decomposed and the growth of heterotrophic bacteria can be further suppressed. Further, the hydrophilicity of the photocatalytic layer 803 can be maintained for a long time. Thereby, the cleaning burden of the toilet bowl 800 can be reduced and the toilet apparatus which has the clean bowl part 801 can be provided.

  Further, the light source device 310 irradiates the bowl portion 801 with ultraviolet rays after the excretion of stool in which filth containing organic matter adheres to the surface of the bowl portion 801. Therefore, the first irradiation mode can be executed efficiently and the organic matter can be decomposed efficiently. Therefore, the life of the light source device 310 can be extended. Thereby, the clean toilet bowl 800 can be maintained for a long time.

  Subsequently, when a predetermined time (for example, about 8 to 10 hours) elapses when the toilet bowl 800 is not used (timing t11 to t12), the light source device 310 emits ultraviolet rays based on a signal transmitted from the control unit 410. The bowl part 801 is irradiated again (second irradiation mode: timings t12 to t13). The irradiation time of ultraviolet rays at timings t12 to t13 is, for example, about 1 to 2 hours. At this time, the irradiation intensity of the ultraviolet rays that the light source device 310 irradiates to the rear part of the bowl portion 801 at timings t12 to t13 is equal to or lower than the irradiation intensity of the ultraviolet rays that the light source device 310 irradiates to the rear portion of the bowl portion 801 at timings t10 to t11. It is.

  According to this, since ultraviolet rays are periodically irradiated, the excited state of the photocatalyst layer 803 can be maintained, and the hydrophilicity of the photocatalyst layer 803 can be maintained. That is, the photocatalyst layer 803 is excited by irradiation with ultraviolet rays after the use of the toilet bowl 800 (in the first irradiation mode) (timing t10 to t11). However, when the time when the toilet bowl 800 is not used passes a predetermined time (for example, about 8 to 10 hours), the excited state of the photocatalyst layer 803 is lowered. This is as described above with reference to FIGS. Therefore, according to this specific example, the excited state of the photocatalyst layer 803 can be maintained, and the hydrophilicity of the photocatalyst layer 803 can be maintained. In addition, since an irradiation mode (second irradiation mode) for exhibiting hydrophilicity of the photocatalyst layer 803 is provided, efficient irradiation according to the application can be performed. Therefore, the life of the light source device 310 can be extended. In addition, since the hydrophilicity of the photocatalyst layer 803 can be maintained until about 10 hours have passed after the irradiation of ultraviolet rays is stopped, it is long in a toilet room with a relatively high frequency of use such as a public facility. A clean toilet device can be provided over the period.

  In addition, a more efficient light source device 310 can be realized. In other words, it is sufficient that the irradiation intensity of the ultraviolet rays irradiated when raising the excited state of the photocatalyst layer 803 is lower than the irradiation intensity of the ultraviolet rays irradiated when decomposing the organic matter. Therefore, according to this specific example, a more efficient light source device 310 can be realized.

Here, at the timings t10 to t11 and the timings t12 to t13, each irradiation intensity of the ultraviolet rays that the light source device 310 irradiates the bowl portion 801 is not only the intensity of light per unit area but also the temporally integrated light. It is a concept that includes strength. For example, at the timings t10 to t11 and the timings t12 to t13, the irradiation intensity when irradiating ultraviolet rays having an intensity of 100 μW / cm ² for 2 hours is the irradiation intensity when irradiating ultraviolet rays having an intensity of 100 μW / cm ² for 1 hour. Higher than.

  In this specific example, the light source device 310 irradiates the surface of the bowl portion 801 with ultraviolet rays after the user leaves the toilet room. However, the light source device 310 may irradiate the surface of the bowl portion 801 with ultraviolet rays before the user leaves the toilet room and after the toilet lid 300 is closed. According to this, since the toilet lid 300 covers the bowl portion 801, the influence on the human body due to ultraviolet rays is suppressed, and the bowl portion 801 is irradiated with ultraviolet rays at an earlier stage after the toilet 800 is used. Can do. Therefore, the photocatalytic layer 803 can exhibit photocatalytic activity and maintain the excited state of the photocatalytic layer 803 at an earlier stage after the toilet 800 is used. In addition, a clean toilet device can be provided.

The embodiment of the present invention has been described above. However, the present invention is not limited to these descriptions. As long as the features of the present invention are provided, those skilled in the art appropriately modified the design of the above-described embodiments are also included in the scope of the present invention. For example, the shape, dimensions, material, arrangement, and the like of each element included in the toilet lid 300 and the casing 400 and the installation form of the light source device 310 are not limited to those illustrated, and can be changed as appropriate.
Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

  DESCRIPTION OF SYMBOLS 10 Toilet apparatus, 21 1st flow path, 22 2nd flow path, 23 3rd flow path, 100 Sanitary washing apparatus, 200 Toilet seat, 300 Toilet lid, 310 Light source apparatus, 400 Casing, 402 Entrance detection sensor, 403 Human body detection sensor, 404 seating detection sensor, 405 toilet lid opening / closing detection sensor, 410 control unit, 420 toilet lid opening / closing drive device, 431 solenoid valve, 471 flow control / flow path switching valve, 480 jetting unit, 501 tile, 505 water, 800 Toilet bowl, 801 Bowl section, 803 Photocatalyst layer, 803a Barrier layer, 803b Functional layer, 805 Reservoir, 807 Draft section, 808 Soil deposit area, 809 Urine deposit area

Claims (5)

A light source device for irradiating ultraviolet rays to the bowl portion of the toilet bowl where the photocatalytic film is formed,
When the toilet is used, the light source device performs a first irradiation mode in which at least any part of the bowl portion is irradiated with ultraviolet rays having an irradiation intensity of 150 microwatts / square centimeter or more,
If the use of the toilet is not confirmed after the use of the toilet until a predetermined time has elapsed, ultraviolet rays having an irradiation intensity lower than the irradiation intensity in the first irradiation mode are applied to the bowl portion. A toilet apparatus characterized by executing a second irradiation mode for irradiating an object.   The toilet apparatus according to claim 1, wherein the light source device irradiates the draft portion around the pooled water formed in the bowl portion in the first irradiation mode.   The toilet device according to claim 1 or 2, wherein the light source device irradiates ultraviolet rays having an irradiation intensity of 633 microwatts / square centimeter or less.   The toilet apparatus according to any one of claims 1 to 3, further comprising an ejection portion that ejects water onto a surface of the bowl portion before the toilet is used. Further comprising a size discrimination means for discriminating between use of stool excretion and use of urine excretion;
The said light source device performs the said 1st irradiation mode, when the said magnitude discrimination means judges that use of the said toilet bowl is use of the excretion action of the said stool, The said 1st irradiation mode is performed. The toilet apparatus as described in any one.

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