JPH0933468A - Sensor and apparatus for detecting replacement time for diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor which can correctly detect a replacement time for diapers. SOLUTION: A detecting sensor 2 for detecting urination in a diaper is constituted of a band-like base material 4 formed of polyethylene terephthalate, a pair of electrodes 6 and 8 formed by printing a silver paste of a volume resistivity of 10<-3> to 10<-4> Ω.cm on the base material 4, and a coating part 10 of a conductive silicone of a volume resistivity of 15Ω.cm covering surfaces of the electrodes 6 and 8. A wet state of the diaper is detected by measuring a conductivity between the electrodes 6 and 8. A change of the conductivity between the electrodes 6 and 8 due to an individual difference of urine can be restricted in the detecting sensor 2 by setting large the resistivity of the coating part 10. Moreover, the change of the conductivity between the electrodes 6 and 8 can be obtained corresponding to a wet area of the diaper by setting small the resistivities of the electrodes 6 and 8. Accordingly, an exchange time for the diaper can be detected correctly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection sensor and a detection device used to detect when to change a diaper.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open Nos. 1-295149 and 2-174846, a method for detecting the replacement time of a diaper is known.
A detection sensor equipped with a pair of electrodes is arranged in the diaper,
It has been proposed to detect wetness of a diaper associated with urination by detecting a change in resistance value or a change in capacitance between the electrodes.

[0003]

However, in the case of the type in which the state of the diaper is grasped by the change of the resistance value or the change of the capacitance between the electrodes like the above-mentioned conventional detection sensor, the urine individual difference, that is, the urine It was not possible to detect the optimum replacement time of the diaper due to the difference in the detection results even under the same wet condition due to individual differences in the concentration of itself and the electrolyte concentrations of sodium chloride, potassium chloride, etc. in urine. .

Therefore, when the conventional detection sensor is provided in the diaper, it is detected that the diaper is not so wet yet, but it is time to replace the diaper, and the number of times the diaper is replaced increases more than necessary. On the contrary, there was a problem that the diaper was wet enough to be replaced but the arrival of the replacement time was not detected, and the person wearing the diaper was uncomfortable. .

On the other hand, in Japanese Patent Laid-Open No. 1-295149, a sensor cloth is formed by embroidering electrodes for detecting urine on a cloth, and the sensor cloth is attached between a diaper cover and a diaper. Is listed. Further, such a sensor cloth is economical because it can be used many times by washing. And
By applying this idea and embroidering or sewing the urine detecting electrode on the cloth diaper itself, it is not necessary to attach and detach the detection sensor each time the diaper is replaced.

However, a non-disposable cloth diaper often uses a bleaching agent containing hypochlorous acid or the like as a main component during washing, which may impair the performance of the sensor electrode. After all, the above-mentioned conventional detection sensor cannot detect the optimum replacement time of the diaper.

Furthermore, in this type of detection sensor, the performance characteristics of the sensor electrode change even after long-term use, so that it may not be possible to detect the optimum replacement time of the diaper. On the other hand, it is possible to detect urination with a temperature sensor, but if the amount of water during urination is small,
Since the detection by the temperature sensor becomes inaccurate, the optimum replacement time cannot be detected. In addition, the diaper needs to be replaced not only during urination but also during defecation, but at present, no detection sensor that can reliably detect defecation is provided, and therefore, the optimum diaper replacement time is also required. It could not be detected.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a diaper replacement timing detection sensor and a diaper replacement timing detection device capable of accurately detecting the diaper replacement timing. Has an aim.

[0009]

The present invention, which has been made to achieve the above object, is provided in a diaper and is provided with at least a pair of electrodes for detecting urination. In the diaper replacement time detection sensor,
The electrode is characterized by being coated with a conductive material.

The present invention according to claim 2 is the diaper replacement timing detection sensor according to claim 1, wherein the resistivity of the electrode is smaller than the resistivity of the conductive material. There is.

The present invention according to claim 3 is a replacement timing detection sensor for a diaper, which is disposed in a diaper and includes at least a pair of electrodes for detecting urination. It is characterized by being coated with a conductive material having resistance to oxidation by a bleaching agent during washing.

Furthermore, the present invention according to claim 4 is a diaper replacement timing detection sensor which is provided in a diaper and which is provided with a plurality of electrodes which are electrically connected to each other by urination. Is the conduction point due to urination in each group,
The diaper is characterized in that the diapers are arranged at different positions.

According to a fifth aspect of the present invention, in the sensor for detecting the replacement time of the diaper according to any one of the first to fourth aspects, the electrode is made of a conductive thread or a fine metal wire. I am trying. Further, the present invention according to claim 6 is the replacement timing detection sensor according to any one of claims 1 to 5, wherein the electrode is provided on a predetermined base material. It has a feature.

On the other hand, according to the present invention as defined in claim 7, there is provided a diaper replacement timing detection sensor which is provided in the diaper and which has at least a pair of electrodes for detecting urination, and between the electrodes. In a diaper replacement timing detection device including characteristic measurement means for measuring electrical characteristics, and detection means for detecting the arrival of the replacement timing of the diaper based on the measurement result of the characteristic measurement means, A resistance value measuring means for measuring a resistance value between two points, an estimating means for estimating a resistance value of the entire electrode based on a measurement result of the resistance value measuring means, and an estimation result of the estimating means are stored in advance. Detecting the replacement time of the diaper, comprising: a correction unit that corrects the measurement result of the characteristic measurement unit based on the initial resistance value of the electrode and outputs the corrected measurement result to the detection unit. apparatus It is the gist.

Further, the present invention according to claim 8 is the diaper replacement timing detecting device according to claim 7, wherein the detecting means includes a measurement result of the characteristic measuring means and a preset reference value. Is configured to detect the arrival of the replacement time of the diaper, and the correction unit corrects the determination reference value instead of correcting the measurement result of the characteristic measurement unit. The gist is a device for detecting the replacement time of a diaper characterized by.

According to a ninth aspect of the present invention, there is provided a diaper replacement timing detection sensor, which is disposed in the diaper and has at least a pair of electrodes for detecting urination, and between the electrodes. In a diaper replacement timing detection device including characteristic measurement means for measuring electrical characteristics and detection means for detecting the arrival of the replacement timing of the diaper based on the measurement result of the characteristic measurement means, A resistance value measuring unit that measures a resistance value between two points, an estimating unit that estimates the resistance value of the entire electrode based on the measurement result of the resistance value measuring unit, and an electrode that is based on the estimation result of the estimating unit. A life determining means for determining whether or not the usage limit has been reached, and a life notifying means for notifying that the electrode has reached the usage limit when the life determining means determines that the electrode has reached the usage limit, Features It is the gist of the exchange time detection device of the diaper.

On the other hand, the present invention according to claim 10 is a diaper, which is arranged in a diaper, generates heat by reacting with moisture, and measuring means for measuring the heat generation amount of the heat generating substance.
The gist is a sensor for detecting the replacement time of the diaper, which is characterized in that

The eleventh aspect of the present invention is the diaper replacement timing detection sensor according to the tenth aspect, wherein the heat-generating substance is sealed with a water-permeable sheet material or in the form of tablets. It is characterized by being formed in.

Further, the present invention according to claim 12 detects stool in a diaper based on the odor measuring means for measuring indole and / or skatole in the air as an odor and the measurement result of the odor measuring means. The gist is a device for detecting the replacement time of a diaper, which is provided with a defecation detecting means.

The present invention according to claim 13 provides the diaper replacement timing detection device according to claim 12,
The defecation detecting means, when the odor is continuously detected for a predetermined time or more based on the measurement result of the odor measuring means,
It is characterized by detecting defecation in diapers.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The effect of the invention and the effect of the invention The replacement timing detection sensor of the diaper according to claim 1 configured as described above includes at least a pair of electrodes, and the electrodes are made of a conductive material. It is covered. Then, in this replacement timing detection sensor, the wet state due to urination of the diaper can be grasped by measuring the electrical characteristics (for example, the resistance value and the electrical conductivity) between the electrodes. That is, the larger the wetted area of diaper with urine, the larger the portion of the diaper that is conducted by urine, and thus the larger the conductivity between electrodes (the smaller the resistance value). Therefore, for example, the conductivity between the electrodes is measured, and when the value of the conductivity exceeds a predetermined value, it can be detected that the diaper replacement time has come.

Here, as described above, since urine varies from person to person, in the above-mentioned conventional detection sensor, the conductivity and resistance value between the electrodes change even if the wet area of the diaper is the same. , It was not possible to accurately detect when to change the diaper. Therefore, it is possible to set the resistivity of the electrode itself to a large value in order to cancel the variation in conductivity due to individual differences in urine, but if the resistivity of the electrode is simply increased,
This time, since the conductivity between the electrodes does not change depending on the wet area of the diaper, it becomes impossible to accurately detect the replacement time of the diaper.

On the other hand, in the diaper replacement timing detection sensor according to claim 1, the electrodes are coated with a conductive material, and the resistivity of the electrodes and the resistivity of the conductive material are appropriately selected. By doing so, it is possible to suppress the variation in conductivity between the electrodes due to individual differences in urine, and it is possible to change the conductivity between the electrodes according to the wet area of the diaper,
It becomes possible to accurately detect when to change the diaper.

In this case, it is desirable that the resistivity of the electrode be set smaller than the resistivity of the conductive material. That is, by setting the resistivity of the conductive material to be large, it is possible to suppress the variation of the conductivity between the electrodes in the same wet area due to the individual difference of urine, and to set the resistivity of the electrode to be small, so that the diaper It is possible to obtain a change in conductivity between electrodes (that is, output characteristics) according to the wetted area.

The electrodes can be formed of various conductive materials such as silver, gold, carbon, aluminum, or a composite material of silver and carbon. Further, as the conductive material for coating the electrode, carbon paste, conductive rubber, conductive silicone, or polymer material such as polyacetylene can be used, and further, an oxide film is formed on the electrode surface. Good.

On the other hand, in the diaper replacement timing detection sensor according to the third aspect, the electrodes are covered with a conductive material having resistance to oxidation by the bleaching agent during washing. Therefore, according to such a replacement time detection sensor, the electrode can be protected from the bleaching agent even if it is washed with a bleaching agent, and the durability can be remarkably improved. Can be accurately detected over a long period of time.

In this case, carbon paste or conductive silicone is suitable as the conductive material for covering the electric wire. Further, also in the replacement timing detection sensor described in claim 3, the electrode can be formed of the same material as that of the replacement timing detection sensor described in claim 1.

Next, in the diaper replacement timing detection sensor according to the fourth aspect, a plurality of sets of electrodes are provided which are electrically connected to each other by urination. Are provided so as to be arranged at different positions in the diaper. Then, according to this replacement timing detection sensor, the wet area due to urine in the diaper can be determined only by performing digital detection such as detecting how many pairs of electrodes are electrically connected by urine. I can figure it out.

Therefore, according to the diaper replacement timing detection sensor of the fourth aspect, it is possible to detect the replacement timing of the diaper without being greatly affected by individual differences in urine. In other words, when grasping the wetted area of the diaper using the above conventional detection sensor having a pair of electrodes, it is necessary to detect the change in the electrical characteristics between the two electrodes in an analog manner. In addition, the detection result varies depending on the individual difference in urine. On the other hand, in the replacement timing detection sensor according to claim 4, the wetted area can be grasped simply by detecting how many sets of electrodes are electrically connected by urine among the plurality of sets of electrodes. It is possible to detect when to change the diaper.

Also in the replacement timing detection sensor according to the fourth aspect, the electrodes can be formed of the same material as that of the replacement timing detection sensor according to the first aspect. On the other hand, in the replacement timing detection sensor of the diaper according to any one of claims 1 to 4, the electrodes may be flexible ones such as film-like ones. As described, the electrodes may be formed by conductive threads or thin metal wires. According to this structure, the electrodes can be directly sewn into the diaper, which is advantageous when the replacement timing detection sensor is integrated with the diaper. It should be noted that the conductive thread also includes a combination of twisted metal fibers.

The electrode may be integrated with the diaper as described above, but as described in claim 6,
The electrodes may be arranged on a predetermined base material. And according to this structure, it is advantageous when the replacement timing detection sensor is formed separately from the diaper.

As the base material for disposing the electrodes,
Polyethylene, polypropylene, nylon, polyethylene terephthalate, polycarbonate, polyvinyl chloride, polyvinylidene chloride, polyimide, silicone rubber,
Materials such as silicone resin, cloth, and paper can be used. Further, the electrode provided on the base material may be a conductive thread or a thin metal wire.

Next, in the diaper replacement timing detection device according to the seventh aspect, a diaper replacement timing detection sensor having at least a pair of electrodes for detecting urination is disposed in the diaper. . Then, the characteristic measuring unit measures the electrical characteristic between the electrodes of the replacement timing detecting sensor, and the detecting unit detects the arrival of the replacement period of the diaper based on the measurement result of the characteristic measuring unit.

Here, in the diaper replacement timing detecting device according to the seventh aspect, the resistance value measuring means measures the resistance value between two predetermined points on the electrodes of the replacement timing detecting sensor, and the estimating means measures the resistance value. The resistance value of the entire electrode is estimated based on the measurement result of the value measuring means. Then, the correction means corrects the measurement result of the characteristic measurement means based on the estimation result of the estimation means and the initial resistance value of the electrode stored in advance, and outputs the corrected measurement result to the detection means. Then, the detection means detects the arrival of the replacement time of the diaper based on the corrected measurement result.

That is, in this replacement timing detection device, the current resistance value of the electrode forming the replacement timing detection sensor is estimated, and the detection means determines the replacement timing of the diaper based on the estimated value and the initial resistance value of the electrode. The measurement result of the characteristic measuring means used for detecting the arrival of the is corrected.

Therefore, according to the diaper replacement timing detection device of the seventh aspect, even if the replacement timing detection sensor is used many times and the resistance value of the electrode changes from the initial resistance value, Since the measurement result of the characteristic measuring means is corrected according to the change over time, the optimum replacement time of the diaper can be accurately detected over a long period of time.

In the replacement timing detecting device according to the seventh aspect, the correcting means corrects the measurement result of the characteristic measuring means. However, as described in the eighth aspect, the detecting means replaces the diaper. The determination reference value used to detect the arrival of the time may be corrected by the correction means.

Even with the replacement timing detecting device according to the present invention configured as above, the optimum replacement timing of the diaper can be accurately detected even if the characteristics of the electrodes of the replacement timing detection sensor change with time. Will be able to. On the other hand, also in the diaper replacement timing detection device according to claim 9,
Similar to the replacement timing detecting device according to claim 7 or 8, the characteristic measuring means measures the electrical characteristic between the electrodes of the replacement timing detecting sensor, and the detecting means is based on the measurement result of the characteristic measuring means. Detects the arrival of the diaper replacement period. Then, the resistance value measuring means measures the resistance value between two predetermined points on the electrode of the replacement timing detection sensor, and the estimating means estimates the resistance value of the entire electrode based on the measurement result of the resistance value measuring means.

Particularly, in the diaper replacement timing detection device according to the ninth aspect, the life determining means determines whether or not the electrode has reached the use limit based on the estimation result of the estimating means, and determines the life. When the determining means determines that the electrode has reached the use limit, the life notifying means notifies that fact.

Therefore, according to the diaper replacement timing detection device of the ninth aspect, when the electrodes of the replacement timing detection sensor have deteriorated to the point of being unusable due to aging, a notification to that effect is given. To be done. Therefore, it is possible to prevent in advance that a detection sensor that cannot exhibit its original performance is used, and as a result, it is possible to accurately detect the optimum replacement time of the diaper.

Next, in the diaper replacement timing detection sensor according to the tenth aspect, the heat-generating substance disposed in the diaper reacts with the water in the urine to generate heat, and the heat generation amount is measured by the measuring means. To do. Therefore, according to the diaper replacement timing detection sensor of claim 10, urination can be reliably detected even when the amount of water during urination is small, and
It is possible to accurately detect when to change the diaper.

A powdery substance is used as the exothermic substance,
It may be distributed over the entire water absorbing portion in the diaper, but as described in claim 11, the exothermic substance is sealed with a sheet material having water permeability, or the exothermic substance is formed into a tablet shape. By doing so, the position where the heat-generating substance is arranged can be freely changed according to the gender difference and the individual difference, and the accuracy of urine detection can be further improved. As the exothermic substance, quicklime or the like can be used, but any substance that reacts with water to generate heat may be used.

Next, in the diaper replacement timing detecting device according to the twelfth aspect, the odor measuring means measures indole and / or skatole in the air as the odor, and the defecation detecting means measures the odor measuring means. Detect defecation in the diaper based on the results. Therefore, according to the diaper replacement timing detection device of the twelfth aspect, it becomes possible to reliably detect defecation in the diaper, and as a result, the diaper replacement timing can be accurately detected.

In the diaper replacement timing detecting device according to the thirteenth aspect, the defecation detecting means determines the odor based on the measurement result of the odor measuring means in the replacement timing detecting device according to the twelfth aspect. When it is detected continuously for more than time,
It is designed to detect bowel movements in diapers.

According to the replacement timing detecting device of the thirteenth aspect having the above-described structure, when the duration of the odor is short, such as "fart", it is not detected as defecation, and the defecation is really made. Only when there is, defecation in the diaper will be detected. Therefore, it becomes possible to detect the replacement time of the diaper more accurately.

[0046]

Embodiments to which the present invention is applied will be described below with reference to the drawings. It is needless to say that the present invention is not limited to the following examples and can take various forms within the technical scope of the present invention.

(First Embodiment) FIG. 1 is a block diagram showing the arrangement of a replacement timing detection sensor (hereinafter, simply referred to as a detection sensor) 2 of the diaper of the first embodiment. Note that FIG. 1 (A)
1 is a front view of the detection sensor 2, and FIG.
It is a figure which expands and represents the AA cross section of (A).
FIG. 1C is an enlarged view of the BB cross section of FIG. Further, in the following description regarding the first embodiment,
Descriptions shown above and below are based on FIG. 1 (A).

As shown in FIG. 1, the detection sensor 2 of the first embodiment comprises a strip-shaped base material 4 and a pair of electrodes 6, 8 formed on the base material 4 in parallel at a predetermined interval. , Each electrode 6, 8
And a conductive covering portion 10 for covering the respective parts.
Here, the upper end portion of the detection sensor 2 is the detector 1 described later.
2 (see FIG. 2), the electrodes 6 and 8 are not provided with the covering portion 10 only at the connection portion 2a, and the electrodes 6 and 8 are exposed. Then, contact portions 6a and 8a that come into contact with the measurement electrodes in the detector 12 are formed at the upper ends of the electrodes 6 and 8, respectively. Also,
In this detection sensor 2, the portion below the connecting portion 2a, that is, the portion where the electrodes 6 and 8 are provided with the covering portion 10 serves as a measuring portion 2b for detecting the wet state of the diaper due to urination.

In the first embodiment, the base material 4 is made of polyethylene terephthalate and has a width of 20 mm and a length of 3 mm.
It is formed to have a thickness of 10 mm and a thickness of 75 μm. The electrodes 6 and 8 are formed by printing a silver paste having a volume resistivity of 10 ⁻³ to 10 ⁻⁴ Ω · cm on the base material 4. The dimensions are 4 mm in width and length. 300mm, thickness 0.3mm
Is set to. The coating portion 10 is formed by coating the surface of each of the electrodes 6 and 8 with a thickness of 0.3 mm with a conductive silicone having a volume resistivity of 15 Ω · cm (for example, XE16-508 manufactured by Toshiba Silicone Co., Ltd.). Has been done.

In the detection sensor 2 thus constructed, as shown in FIG. 2, the measuring portion 2b is arranged inside the absorption layer 14a of the diaper 14 or on the surface of the absorption layer 14a, and The connecting portion 2a is connected to the detector 12 attached to the waist portion of the diaper 14. In this embodiment, when the connecting portion 2a of the detection sensor 2 is inserted into the insertion opening 12a of the detector 12, the contact portions 6a, 8 of the electrodes 6, 8 are inserted.
The a is configured to contact the measurement electrode in the detector 12.

On the other hand, the detector 12 measures the electrical conductivity between the electrode 6 and the electrode 8 of the detection sensor 2, and when the measured value exceeds a predetermined judgment reference value, it is judged that the diaper 14 has become wet. The buzzer or lamp is used to notify a third party to that effect. Next, a comparative experiment carried out using the detection sensor 2 of the first embodiment and a detection sensor 16 which is different from the detection sensor 2 only in that the covering portion 10 is not provided as shown in FIG. Will be described with reference to FIGS. 3 and 4.

First, in this experiment, an aqueous solution of potassium chloride (KCl) was used instead of urine, and the potassium chloride aqueous solution was soaked from the lower end of each of the detection sensor 2 and the detection sensor 16 to a predetermined height position. At that time, the electrical conductivity between both electrodes 6 and 8 with respect to the concentration of the potassium chloride aqueous solution was measured. The measurement result of the detection sensor 16 is shown in FIG.
As shown in FIG. 4B, the measurement result of the detection sensor 2 is as shown in FIG.

The length from the lower ends of the detection sensors 2 and 16 to the position where the potassium chloride aqueous solution is soaked corresponds to the wetted area of the diaper 14, and this length is hereinafter referred to as the "immersion length". Further, in the following description and FIGS. 3 to 5, the unit “mS” is “milli-Siemens” and represents the reciprocal of the resistance value of an object having an area of 1 square centimeter and a length of 1 centimeter. The unit "N" represents the normality.

Here, according to the Biochemical Data Book (edited by the Chemical Society of Japan), the conductivity of urine is in the range of 13 mS to 33 mS in consideration of individual differences and daily fluctuations, and is converted to the concentration of an aqueous solution of potassium chloride. Then, it corresponds to 0.1N to 0.4N. Therefore, if the conductivity between the electrodes 6 and 8 does not change for 0.1N to 0.4N potassium chloride aqueous solution, the diaper replacement timing can be detected without being affected by individual differences in urine. Become.

However, as shown in FIG.
In the case of the detection sensor 16 (that is, the conventional detection sensor) in which the electrodes 6 and 8 are not provided with the covering portion 10, the electrodes 6 and 8 are used.
It can be seen that the electrical conductivity between the two changes linearly with the concentration of the potassium chloride aqueous solution. Therefore, when this detection sensor 16 is used, the conductivity between the electrodes 6 and 8 varies due to individual differences in urine and the like, and it is not possible to accurately detect when to change the diaper.

On the other hand, in the case of the detection sensor 2 of the first embodiment, as shown in FIG. 4, 6, 8 between the electrodes is applied to 0.1N to 1.0N potassium chloride aqueous solution.
The conductivity of is almost unchanged. Therefore, by using the detection sensor 2 of the first embodiment, it is possible to accurately detect the replacement time of the diaper without being affected by individual differences in urine and daily fluctuations.

Next, using the detection sensor 2 of the first embodiment, the water immersion length with a potassium chloride aqueous solution of a predetermined concentration, and
The relationship with the conductivity between the electrodes 6 and 8 was measured. The result is shown in FIG. As shown in FIG. 5, in the detection sensor 2 of the first embodiment, the conductivity between the electrodes 6 and 8 is almost proportional to the water immersion length. Therefore,
In the detection sensor 2 of the first embodiment, the conductivity between the electrodes 6 and 8 changes according to the wetted area of the diaper 14, so that the wet condition of the diaper can be accurately grasped, and by extension, the diaper 1
The replacement time of 4 can be accurately detected.

The present inventor has confirmed that the use of the high-resistance electrode makes it possible to suppress the variation in the conductivity between the two electrodes with respect to the concentration of the potassium chloride aqueous solution (that is, the individual difference in urine). Therefore, although not shown, a conductive silicone itself having a volume resistivity of 15 Ω · cm was prepared as an electrode, and the same measurement as in FIG. 5 was performed. However, merely setting the resistivity of the electrode itself large in this way did not result in a proportional relationship between the water immersion length and the conductivity between both electrodes.

As described above, the detection sensor 2 according to the first embodiment.
According to this, it is possible to suppress the fluctuation of the conductivity between the electrodes 6 and 8 due to the individual difference of urine, and it is possible to change the conductivity between the electrodes 6 and 8 in accordance with the wet area (immersion length) of the diaper 14. Therefore, it is possible to accurately detect the replacement time of the diaper 14.

By the way, as the material of the base material 4, the electrodes 6 and 8, and the covering portion 10, various materials exemplified in the "Embodiment of the Invention" can be used. Also, the covering part 1
0 may be coated on the entire electrodes 6, 8. On the other hand, the detection sensor 2 of the first embodiment has a pair of electrodes 6, 8
However, a plurality of pairs of electrodes may be provided.

Further, in the first embodiment, the electrodes 6 and 8 are formed on the base material 4, but for example, as shown in FIG. 6, the electrode 18 made of conductive thread or fine metal wire, A thread-shaped sensor electrode 21 may be formed from the conductive coating portion 20 that covers the electrode 18. With such a configuration, at least one pair of the sensor electrodes 21 of FIG. 6 can be prepared and directly sewn into the diaper, which is very advantageous for integrating the detection sensor and the diaper.
6A is a front view of the sensor electrode 21, and FIG.
FIG. 6B is an enlarged view of the cross section C-C of FIG.

(Second Embodiment) FIG. 7 is a block diagram showing the structure of the detection sensor 22 of the second embodiment. Incidentally, FIG.
7A is a front view of the detection sensor 22, and FIG.
FIG. 8 is an enlarged view showing a DD cross section of FIG.

As shown in FIG. 7, the detection sensor 22 of the second embodiment is similar to the detection sensor 2 of the first embodiment in that the belt-shaped base material 24 and the base material 24 are spaced by a predetermined distance. It is composed of a pair of electrodes 26 and 28 arranged in parallel, and a conductive coating portion 30 that covers the electrodes 26 and 28, respectively. However, in the detection sensor 22, the base material 24 is made of polyvinyl chloride, and the electrodes 26 and 28 are
However, it is different from the case of the first embodiment in that it is formed of a conductive thread having a volume resistivity of 10 ⁻³ to 10 ⁻⁴ Ω · cm.

In the detection sensor 22 as well, the coating portion 30 is formed of the same conductive silicone as that of the coating portion 10 of the first embodiment, but the conductive silicone is oxidized by the bleaching agent at the time of washing. Resistant to. The detection sensor 22 is also disposed in the diaper 14 and connected to a predetermined detector 12 for use, just like the detection sensor 2 of the first embodiment.

Next, the detection sensor 22 of the second embodiment having such a configuration and the covering portion 30 for the detection sensor 22.
A comparative experiment performed using a detection sensor (not shown), which is different only in that it is not provided, will be described. In this experiment, with respect to each of the detection sensor 22 and the detection sensor not provided with the covering portion 30, the characteristic change with respect to the bleaching agent generally used at the time of washing at home or the like was measured. That is,
Uses Kao's Higher (brand name) as a bleaching agent,
In an aqueous solution of the bleach diluted to a concentration of 10 cc / L,
The above detection sensors were immersed. Then, the rate of change in conductivity between the electrodes 26 and 28 with respect to the number of days of immersion was measured, and the results shown in FIG. 8 were obtained.

The electrical conductivity measured in this experiment is the electrical conductivity between the electrodes 26 and 28 when the above detection sensors are immersed in an aqueous solution of potassium chloride having a predetermined concentration for a predetermined immersion length. The rate of change (%) shown on the vertical axis of 8 is a value obtained by multiplying the ratio of the initial value of the conductivity before the detection sensor is immersed in the bleach and the conductivity after that by 100. Further, in FIG. 8, the line labeled “coated conductive thread” is the measurement result of the detection sensor 22, and the line labeled “conductive thread” does not include the coating portion 30. Is the measurement result.

As shown in FIG. 8, in the detection sensor 22 having the covering portion 30, the change in conductivity between the electrodes 26 and 28 is suppressed to be extremely small as compared with the detection sensor not having the covering portion 30. I know that Therefore, the covering portion 3
According to the detection sensor 22 of the second embodiment including 0, the electrodes 26 and 28 are protected from the bleaching agent even when washed with the bleaching agent, and the durability can be significantly improved. As a result, it is possible to accurately detect the replacement time of the diaper over a long period of time.

In the second embodiment, the conductive silicone is used as the material of the covering portion 30, but any material can be used as long as it is resistant to the bleaching agent and has conductivity. In addition, the detection sensor 2 of the second embodiment
In 2, the electrodes 26 and 28 are arranged on the base material 24. However, the base material 24 is removed and the electrodes 26 and 28 covered by the covering portion 30 are sewn into a predetermined cloth or the like. Alternatively, the sensor cloth may be formed by using, or may be sewn directly into the diaper.

(Third Embodiment) Next, a replacement time detecting device for the diaper of the third embodiment (hereinafter, simply referred to as a detecting device) 3
1 will be described with reference to FIG. As shown in FIG. 9A, the detection device 31 of the third embodiment includes a detection sensor 2 of the first embodiment shown in FIG.
And a detector 32 for notifying that the time for exchanging the diaper has arrived by measuring the electrical conductivity between the eight. In addition, in FIG. 9, the covering portion 10 of the detection sensor 2 is omitted. Further, in the following description regarding the third embodiment,
The description above and below is based on FIG. 9B.

Here, the detector 32 has the conductivity between the measurement points S1 and S2 set at the upper ends (contact portions 6a and 8a) of the electrodes 6 and 8 of the detection sensor 2, that is, both electrodes 6 and 6. Conductivity measuring section 34 as a characteristic measuring means for measuring the conductivity between 8 and measuring point S1 of electrode 6 and measuring point S3 set at electrode 6 below measuring point S1 by a predetermined length L2.
Between the resistance value estimating unit 36 and the resistance value estimating unit 36 as the resistance value measuring unit and the estimating unit that estimates the resistance value of the entire electrode 6 based on the measured value. The resistance value of the entire electrode 6 and the electrode 6 stored in advance
Based on the initial resistance value of the whole, the measurement result of the conductivity measuring unit 34 is corrected, and the corrected measurement result is output, and the correction unit 38 outputs the correction result after the correction. Comparing the measurement result of and the preset determination reference value, if it is determined that the corrected measurement result is larger,
A replacement time determination unit 40 as a detection unit that determines that the replacement time of the diaper has arrived.

Further, the detector 32 determines whether or not the resistance value of the entire electrode 6 estimated by the resistance value estimating section 36 is equal to or more than a predetermined value indicating the use limit of the electrodes 6, 8. When the life determining unit 42 as a determining unit and the life determining unit 42 determine that the resistance value of the entire electrode 6 is equal to or larger than a predetermined value indicating the usage limit, the alarm 44 as a life notifying unit for notifying that effect. And are equipped with.
It should be noted that the notification device 44 is also configured to notify when the replacement time determination unit 40 determines that the replacement time of the diaper has arrived. Further, this notification is performed by turning on a lamp or sounding a buzzer.

In the thus constructed detector 31 of the third embodiment, as in the case of the first embodiment, the detection sensor 2 is arranged in the diaper 14 as illustrated in FIG. The detector 32 is attached to the waistline portion of the diaper 14 or the like. Then, in the detector 32, the conductivity measuring unit 34 causes the conductivity between the measurement points S1 and S2 (that is, the electrodes 6 and 6).
Conductivity between 8) is measured.

Further, the resistance value estimating unit 36 measures the resistance value R2 between the measurement points S1 and S3 of the electrode 6, and uses the resistance value R2 to calculate the total length of the electrode 6 based on the following "formula 1". Estimate the total resistance R1 over L1. The electrode 8
Is formed in exactly the same way as the electrode 6, and since both electrodes 6 and 8 are in the same environment, the total resistance value of the electrode 8 is
It can be assumed that it is the same as the overall resistance value R1 of the electrode 6.

[0074]

[Formula 1] R1 = R2 × L1 / L2 (Equation 1) Then, the correction unit 38 causes the overall resistance value R1 of the electrode 6 estimated by the resistance value estimation unit 36 and the initial value of the entire electrode 6 stored in advance. The ratio R1 / Rs to the resistance value Rs is obtained, and the measurement result of the conductivity measuring unit 34 is corrected according to the ratio R1 / Rs.

Then, the replacement time determination section 40 is replaced by the correction section 3
The corrected measurement result output from 8 is compared with a preset determination reference value, and when the replacement timing determination unit 40 determines that the corrected measurement result is larger, the alarm 44 Informs that it is time to replace the diaper.

On the other hand, the life determining unit 42 is composed of the resistance value estimating unit 3
It is determined whether the total resistance value R1 of the electrode 6 estimated by 6 is equal to or more than a predetermined value indicating the use limit of the electrodes 6 and 8, and the life determining unit 42 sets the total resistance value R1 to be equal to or more than the predetermined value. When it is determined that the limit has been reached, the notification device 44 notifies that the electrodes 6, 8 of the detection sensor 2 have deteriorated and have reached the use limit.

According to the detection device 31 of the third embodiment as described above, even if the detection sensor 2 is used many times and the resistance values of the electrodes 6 and 8 change from the initial resistance values,
Since the measurement result of the conductivity measuring unit 34 is corrected according to the change over time, the optimum replacement time of the diaper can be accurately detected over a long period of time. Moreover, according to the detection device 31 of the third embodiment, the electrodes 6 and 8 of the detection sensor 2 cannot be used due to aging (that is, the correction unit 3).
If it deteriorates (to such a degree that it is difficult to correct by 8), the fact is notified, so that the detection sensor 2 that cannot accurately detect the replacement time of the diaper is prevented in advance. be able to.

By the way, in the above-mentioned detecting device 31, the correcting section 38 is constituted to correct the measurement result of the conductivity measuring section 34, but as shown by the dotted line in FIG. 9 (A),
The measurement result of the conductivity measuring unit 34 is directly input to the replacement timing determination unit 40, and the correction unit 38 corrects the determination reference value of the replacement timing determination unit 40 according to the resistance value ratio R1 / Rs. It may be configured to do so. In this case, correction such as dividing the determination reference value by the ratio R1 / Rs may be considered.

Even with this structure, the electrodes 6,
It becomes possible to accurately detect the replacement time of the diaper regardless of the change with time of 8. On the other hand, in the third embodiment, the measurement points of the electrodes 6 and 8 are three points S1 to S3, but may be four points or more, and the electrodes 6 and 8 may be partially measured. The resistance value R2 may be measured to estimate the total resistance value R1.

Further, in the detection device 31 of the third embodiment, the detection sensor 2 of the first embodiment is used as the detection sensor arranged in the diaper, but the conventional detection sensor 16 shown in FIG. Alternatively, the detection sensor 22 of the second embodiment shown in FIG.
Etc., various detection sensors can be used.

(Fourth Embodiment) Next, the detection sensor 52 of the fourth embodiment will be described with reference to FIG. Incidentally, FIG.
10A is a front view of the detection sensor 52, and FIG.
10B is an enlarged view of the EE cross section of FIG. 10A, and FIG. 10C is an enlarged view of the FF cross section of FIG. 10A. Further, in the following description regarding the fourth embodiment, the description showing the upper and lower parts is based on FIG. 10 (A).

As described above, in the conventional detection sensor 16 illustrated in FIG. 3 (A), even if the water immersion length (wetting area of the diaper) is the same, the electrodes 6, 6 are different due to individual differences in urine.
Since the conductivity between Nos. 8 fluctuated, it was not possible to accurately detect the replacement time of the diaper. Therefore, like the detection sensor 2 of the first embodiment, this problem can be solved by providing the electrodes 6 and 8 with the conductive coating portion 10. However, the detection sensor 52 of the fourth embodiment is The above problem is solved by a method different from that of the first embodiment.

As shown in FIG. 10, the detection sensor 52 of the fourth embodiment has a strip-shaped base material 54 and six sets of three electrodes arranged in parallel on the base material 54 with a predetermined space therebetween. A-1, B
-1, A-2, B-2, A-3, B-3, and the insulating coating 56 provided on the base material 54 and covering the electrodes A-1 to B-3.
It consists of and.

Here, the six electrodes A-1 to B-3 are the electrodes A-1 and B-1, the electrodes A-2 and B-2, the electrodes A-3 and B-3, Each set is one set, and the lower ends of the electrodes A-1 to B-3 are formed in an "L" shape so that the lower ends of the electrodes of each set face each other. In this embodiment, the lower end of the electrode A-1 and the lower end of the electrode B-1 face each other at the lowest position, and the lower end of the electrode A-2 and the lower end of the electrode B-2 are located above the lower end. And the lower end of the electrode A-3 and the lower end of the electrode B-3 are arranged so as to face each other.

The upper end portion of the detection sensor 52 is a connecting portion 52a with a detector (not shown), and the connecting portion 52a and the lower end portions of the electrodes A-1 to B-3 face each other. The insulating coating 56 is not provided only on the portion 52b (that is, the measurement portion 52b of the detection sensor 52), and the electrodes A-1 to B-3 are exposed. That is, the insulating coating 56 covers portions other than the portion necessary for detecting wetness of the diaper.

In the fourth embodiment, the base material 54 and the electrodes A-1 to B-3 are made of the same material as that of the detection sensor 2 of the first embodiment. A
As the materials of -1 to B-3, various materials exemplified in the "embodiment mode" can be used. Further, the insulating coating 56 may be anything as long as it is insulative, and a polymer film, an adhesive, a pressure sensitive adhesive, paper, a tape or the like can be used.

The detection sensor 52 thus constructed is
Similar to the detection sensor 2 of the first embodiment, its measuring section 52b.
Is disposed inside the absorption layer of the diaper, or on the surface of the absorption layer, and the connecting portion 52a is connected to a predetermined detector attached to the waist portion of the diaper or the like.

When the urine output is small in the diaper, for example, the lower end of the electrode A-1 and the electrode B-1 are
The lower end of the electrode A-2 and the lower end of the electrode B-2 become conductive as the amount of urination increases, and finally the lower end of the electrode A-3 and the electrode B-3 become conductive. The lower end of is conductive.

Therefore, in the detector connected to the connecting portion 52a of the detection sensor 52, it is determined whether or not the electrodes of each set are electrically connected, and whether or not the conductivity between the electrodes is equal to or more than a predetermined value. Whenever the electrodes of each set are electrically connected to each other, for example, the lamp provided corresponding to each electrode of each set is turned on.

That is, in the detection sensor 52 of the fourth embodiment, the three sets of six electrodes A-1 to B-3 are arranged at different positions in the diaper, respectively, at the conduction points by urination for each set. It is provided to be done. Therefore, three sets of electrodes A-
The wet area due to urination in the diaper can be grasped only by performing digital detection such as detecting how many sets of electrodes among 1, B-1 to A-3, B-3 are conducted by urine. .

Therefore, according to the detection sensor 52 of the fourth embodiment, it is possible to detect the replacement time of the diaper without being greatly affected by individual differences in urine. That is, FIG.
When grasping the wetted area of the diaper using the detection sensor 16 exemplified in (A), it is necessary to detect the change in the electrical conductivity between the electrodes 6 and 8 in an analog manner. In this case, The detection result varies depending on the individual difference in urine. On the other hand, the detection sensor 52 of the fourth embodiment detects how many of the three sets of electrodes A-1, B-1 to A-3, B-3 are electrically connected by urine. Since the wetted area can be grasped only by itself, it is possible to easily and accurately detect the replacement time of the diaper.

Although the detection sensor 52 of the fourth embodiment has six sets of three electrodes A-1 to B-3, the number of electrodes can be set appropriately. (Fifth Embodiment) Next, as a modification of the fourth embodiment,
The detection sensor 62 of the fifth embodiment will be described with reference to FIG. Note that FIG. 11A is a front view of the detection sensor 62, and FIG. 11B is a GG sectional view of FIG. 11A. In addition, in the following description of the fifth embodiment, the description of the upper and lower parts is based on FIG. 11 (A).

As shown in FIG. 11, the detection sensor 62 of the fifth embodiment has a strip-shaped base material 64 and five electrodes C- arranged in parallel on the base material 64 with a predetermined space therebetween. 1, D-
1, D-2, D-3, D-4, and an insulating coating 66 provided on the base material 64 and covering the electrodes C-1, D-1 to D-4,
It consists of

Here, the five electrodes C-1, D-1 to D-
4 has the electrode C-1 in common, and the electrode C-1 and the electrode D-.
1, electrode C-1 and electrode D-2, electrode C-1 and electrode D-
3, the electrode C-1 and the electrode D-4 are paired respectively.
The electrode C-1 and the electrode D-1 are formed to have the same length, but the electrodes D-2 to D-4 are formed so that the length becomes shorter in the order of D-2 to D-4. ing.

On the other hand, also in this detection sensor 62, the upper end portion is a connection portion 62a with a detector (not shown), and the insulation coating 66 is provided at the connection portion 62a.
Are not provided, and the electrodes C-1, D-1 to D-4 are exposed. The insulating coating 66 is provided downward from the connecting portion 62a by a predetermined length, and the electrodes C-1 and D are provided.
The end portions on the side opposite to the connection portion 62a side of -1 to D-4 are exposed. That is, in the fifth embodiment, the electrodes C-1 and D are
The portion opposite to the connecting portion 62a side of -1 to D-4 and not provided with the insulating coating 66 is the measuring portion 62b.

In the fifth embodiment, the base 64, the electrodes C-1, D-1 to D-4, and the insulating coating 66 are the fourth.
It is formed of the same material as the detection sensor 52 of the embodiment. The detection sensor 62 configured as described above also includes the first
Similarly to the detection sensors 2 and 52 of the fourth embodiment, the measuring portion 62b is disposed inside the absorbing layer of the diaper, the surface of the absorbing layer, or the like, and the connecting portion 62a is around the waist of the diaper. It is connected to a predetermined detector attached to the section or the like.

When the amount of urine is small in the diaper, only the electrodes C-1 and D-1 are electrically connected, and as the amount of urine is increased, the electrodes C-1 and D-2 are electrically connected. Further, the electrode C-1 and the electrode D-3 are brought into conduction, and finally the electrode C-1 and the electrode D-4 are brought into conduction.

Therefore, even with the detection sensor 62 of the fifth embodiment, as in the case of the detection sensor 52 of the fourth embodiment, among the four pairs of electrodes C-1, D-1 to D-4. The wet area due to urination in the diaper can be ascertained simply by performing digital detection, such as detecting how many sets of electrodes are electrically connected by urine. The replacement time of can be detected.

Further, according to the detection sensor 62 of the fifth embodiment, since the electrode C-1 is commonly used for each set, the number of electrodes can be reduced and the detection sensor 6
This is advantageous in reducing the size and cost of the device 2. (Sixth Embodiment) Next, the detection sensor 72 of the sixth embodiment will be described with reference to FIG. In addition, FIG.
FIG. 12 is a perspective view of the diaper 74 to which the detection sensor 72 is attached, and FIG. 12 (B) is a H-H sectional view of FIG. 12 (A).

As shown in FIG. 12, the detection sensor 72 of the sixth embodiment is disposed inside the absorption layer 74a of the diaper 74, and the heat generating substance 72a which reacts with moisture to generate heat.
And a heat detector 72b which is provided outside the waterproof cover 74b of the diaper 74 and detects the heat generation of the heat generating substance 72a.

Here, in the present embodiment, the heat generating material 7
Powdered quicklime is used as 2a, which is sealed in a pack with a water-permeable sheet material 76 and arranged inside the absorbent layer 74a of the diaper 74. Further, the heat detector 72b is provided with a thermocouple as a measuring means for measuring the calorific value of the exothermic substance 72a, and when the calorific value measured by the thermocouple becomes a predetermined value or more,
It is configured to notify a third party that there is urination by a lamp or a buzzer.

In such a detection sensor 72, when urine is discharged in the diaper 74, the heat generating substance 72a reacts with the water in the urine to generate heat. Then, the heat detector 72b
The amount of heat generated is measured to notify that urination has occurred.
Therefore, according to the detection sensor 72 of the sixth embodiment, urination can be reliably detected even when the amount of water at the time of urination is small, and in turn, the diaper replacement timing can be accurately detected. be able to.

Moreover, in the detection sensor 72 of the sixth embodiment, the heat-generating substance 72a is made into a pack shape by the water-permeable sheet material 76, so that it may be different according to gender and individual difference.
The position where the heat-generating substance 72a is arranged can be freely changed, and the urine detection accuracy can be further improved.

The exothermic substance 72a may be formed in a tablet shape instead of a pack shape. Further, in the above embodiment, quick lime was used as the exothermic substance, but any substance that reacts with moisture to generate heat may be used. On the other hand, in the above embodiment,
Although the thermocouple is used as the measuring means of the heat detector 72b, the amount of heat generated by the heat generating substance 72a may be measured using a thermistor. Further, in the above embodiment, the heat detector 72b
Although it is arranged outside the waterproof cover 74b of the diaper 74, it may be arranged inside the diaper 74.

(Seventh Embodiment) Next, a detection device 80 of the seventh embodiment will be described with reference to FIG. FIG.
As shown in (A), the detection device 80 of the seventh embodiment is attached to a predetermined position of the diaper 82, and detects the odor in the air to detect the replacement time of the diaper 82.

Then, as shown in FIG. 13B, the detection device 80 is provided with an odor measuring section 82 as odor measuring means for measuring odor. Since the odor generated by defecation is typically indole and skatole, in the present embodiment, the odor measuring unit 82 removes the odor from the indole from the ventilation hole 80a provided in the main body of the detection device 80. Is configured to measure as.

Further, the detecting device 80 has a timer 84.
Further, a judging device 86 as a defecation detecting means for detecting the occurrence of defecation based on the measurement result of the odor measuring section 82, and an alarm device 88 composed of a buzzer, a lamp and the like are provided. In the detection device 80 configured as described above, the determiner 86
However, it is determined whether or not the odor measured by the odor measuring unit 82 is equal to or higher than a predetermined level, and the timer 84 measures the duration of the odor measured above the predetermined level. When the time measured by the timer 84 is equal to or longer than the predetermined time, the determiner 86 determines that there is defecation and activates the alarm 88, whereby the defecation occurs, that is, the diaper 82 replacement time. Informs a third party that has arrived.

As described above, according to the detection device 80 of the seventh embodiment, it is possible to detect the defecation in the diaper 82. Moreover, the detection device 80 detects defecation in the diaper 82 when the time when the odor is higher than the predetermined level continues for the predetermined time or longer. Therefore, if the duration of the odor is short like a fart, it is not detected as defecation, and defecation in the diaper is detected only when there is a real defecation. Therefore, it becomes possible to detect the replacement time of the diaper more accurately.

In the seventh embodiment, the odor measuring unit 82
Was configured to measure indole as an odor, but it may be configured to measure skatole as an odor. Alternatively, both indole and skatole may be measured as odors.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating a configuration of a detection sensor according to a first embodiment.

FIG. 2 is an explanatory diagram illustrating a usage state of the detection sensor of FIG.

FIG. 3 is an explanatory diagram illustrating a detection sensor that does not include a covering portion in the detection sensor of FIG. 1.

FIG. 4 is a graph showing the results of measuring the relationship between the concentration of an aqueous solution of potassium chloride and the conductivity between both electrodes of the detection sensor of FIG.

FIG. 5 is a graph showing a result of measuring a relationship between a water immersion length of a potassium chloride aqueous solution having a predetermined concentration and an electric conductivity between both electrodes in the detection sensor of FIG.

FIG. 6 is an explanatory diagram illustrating another detection sensor different from the detection sensor of FIG. 1.

FIG. 7 is a configuration diagram illustrating a configuration of a detection sensor according to a second embodiment.

FIG. 8 is a graph showing a result of measuring a characteristic change with respect to a bleaching agent in the detection sensor of FIG.

FIG. 9 is an explanatory diagram illustrating a detection device according to a third embodiment.

FIG. 10 is a configuration diagram illustrating a configuration of a detection sensor according to a fourth embodiment.

FIG. 11 is a configuration diagram showing a configuration of a detection sensor of a fifth example.

FIG. 12 is an explanatory diagram illustrating a detection sensor according to a sixth embodiment.

FIG. 13 is an explanatory diagram illustrating a detection device according to a seventh embodiment.

[Explanation of reference numerals] 2, 16, 22, 52, 62, 72 ... Detection sensors 2a, 52a, 62a ... Connection portions 2b, 52b, 62
b ... Measuring part 4, 24, 54, 64 ... Base material 10, 20, 30 ... Covering part 6, 8, 18, 26, 28, A-1 to A-3, B-1 to
B-3, C-1, D-1 to D-4 ... Electrodes 12, 32
... Detector 14, 74 ... Diaper 14a, 74a ... Absorption layer 74b ... Waterproof cover 2
1 ... Sensor electrodes 31, 80 ... Detecting device 34 ... Conductivity measuring unit 36
... Resistance value estimation unit 38 ... Correction unit 40 ... Replacement timing determination unit 42 ... Life determination unit 44, 88 ... Alarm device 56, 66 ... Insulation coating 72
a ... Exothermic substance 72b ... Heat detector 76 ... Sheet material 82 ... Odor measuring unit 84 ... Timer 86 ... Judgment device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsunori Yaguchi 1-1, Showa-cho, Kariya city, Aichi Prefecture

Claims (13)

[Claims] 1. A replacement timing detection sensor for a diaper, which is disposed in a diaper and includes at least a pair of electrodes for detecting urination, wherein the electrodes are covered with a conductive material.
A sensor for detecting when to change the diaper. 2. The diaper replacement timing detection sensor according to claim 1, wherein the electrode has a resistivity lower than that of the conductive material. 3. A replacement timing detection sensor for a diaper, which is disposed in a diaper and comprises at least a pair of electrodes for detecting urination, wherein the electrodes are resistant to oxidation by bleaching agents during washing. A replacement time detection sensor for a diaper, which is covered with a conductive material having resistance. 4. A replacement timing detection sensor for a diaper, which is arranged in a diaper and comprises a plurality of sets of electrodes that are electrically connected to each other by urination, wherein the electrodes are provided with conductive points for urination for each set. , A diaper replacement timing detection sensor, which is provided so as to be arranged at different positions in the diaper, respectively. 5. The diaper replacement timing detection sensor according to claim 1, wherein the electrode is made of a conductive thread or a thin metal wire. 6. The diaper replacement timing detection sensor according to claim 1, wherein the electrodes are provided on a predetermined base material. Timing detection sensor. 7. A replacement timing detection sensor for a diaper, which is disposed in the diaper and has at least a pair of electrodes for detecting urination, and a characteristic measuring means for measuring an electrical characteristic between the electrodes. A diaper replacement timing detection device comprising: a detection means for detecting the arrival of the replacement timing of the diaper based on the measurement result of the characteristic measuring means; and a resistance for measuring a resistance value between two predetermined points of the electrode. Value measuring means, an estimating means for estimating the resistance value of the entire electrode based on the measurement result of the resistance value measuring means, and the estimating means for estimating the resistance value of the entire electrode A diaper replacement timing detection device comprising: a correction unit configured to correct the measurement result of the characteristic measurement unit and output the corrected measurement result to the detection unit. 8. The diaper replacement timing detection device according to claim 7, wherein the detection means compares the measurement result of the characteristic measuring means with a preset determination reference value to change the diaper replacement timing. Of the diaper, wherein the correction means corrects the judgment reference value instead of correcting the measurement result of the characteristic measuring means. apparatus. 9. A replacement timing detection sensor for a diaper, which is disposed in the diaper and has at least a pair of electrodes for detecting urination, and a characteristic measuring means for measuring an electrical characteristic between the electrodes. A diaper replacement timing detection device comprising: a detection means for detecting the arrival of the replacement timing of the diaper based on the measurement result of the characteristic measuring means; and a resistance for measuring a resistance value between two predetermined points of the electrode. Value measuring means, an estimating means for estimating the resistance value of the entire electrode based on the measurement result of the resistance value measuring means, and determining whether or not the electrode has reached the use limit based on the estimation result of the estimating means. And a life determining means for notifying that the electrode has reached the use limit when the life determining means determines that the electrode has reached the use limit. 10. A diaper exchange comprising: a heat-generating substance that is disposed in a diaper and that generates heat by reacting with moisture; and a measuring unit that measures the heat generation amount of the heat-generating substance. Timing detection sensor. 11. The diaper replacement timing detection sensor according to claim 10, wherein the heat generating substance is sealed with a water-permeable sheet material or formed into a tablet shape. Replacement diaper replacement sensor. 12. An odor measuring means for measuring indole and / or skatole in the air as an odor, and a defecation detecting means for detecting defecation in a diaper based on the measurement result of the odor measuring means. Characteristic diaper replacement timing detection device. 13. The diaper replacement timing detection device according to claim 12, wherein the defecation detection means detects the odor continuously for a predetermined time or more based on the measurement result of the odor measurement means,
A diaper replacement timing detection device characterized by detecting defecation in a diaper.