JPH06138247A - Toilet seat human sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a seating detection device for a toilet seat, which can detect a stable and reliable seating of a human body on a toilet seat by detecting the electrostatic capacitance between the human body and the ground. [Structure] This device includes a heater wire 12 disposed inside the toilet seat 1, a heat conductive conductor 11 provided along with the heater wire,
An oscillating circuit 30 for generating a high-frequency signal, a coupling transformer 31 having an output of the oscillating circuit connected to a primary coil and a secondary coil connected to the signal line, and a primary coil of the coupling transformer. Inductance 32, a detection circuit 33 for converting a voltage signal from both ends of the inductance into a voltage signal proportional to the amplitude of a high-frequency signal, and a determination circuit 34 for comparing the output of the detection circuit with a preset determination reference to determine a human sitting. And an inductor 4 inserted to shut off the heater from the AC power line at high frequencies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toilet seat for detecting the seating of a human body on a toilet seat in order to operate a cleaning device, a drying device, a deodorizing device, etc., only when a human is seated on the toilet seat in a shower toilet or the like. Seat occupancy detection device.

[0002]

2. Description of the Related Art As a capacitance type detecting means for detecting the proximity or contact of a human body, there is, for example, a "seating switch" disclosed in Japanese Utility Model Laid-Open No. 63-38879. This is because the heat-conducting conductor of the heater in the toilet seat is used as one electrode of the capacitance type sensor and the other electrode is provided so as to face it, and the distance between both electrodes changes depending on the human body load when sitting. The change in the electrode interval is detected as a change in capacitance. In such a conventional seating switch, there is a problem in that the electrode interval greatly changes depending on the size of the human body load, the sensitivity varies greatly depending on the weight, and an infant or the like cannot be detected. Therefore, attempts have been made to improve the detection sensitivity for the seating detection of a lightweight person such as an infant, but conversely, there is a problem in that the toilet seat lid is turned on and off to cause an erroneous operation.

The "personnel detection device" disclosed in Japanese Patent Laid-Open No. 3-233391 is provided with a pair of electrodes on a plane and detects a person from a change in capacitance between the electrodes. This device has a dielectric, which is interposed between the human body and the electrodes,
For example, there is a problem that a stable detection sensitivity cannot be ensured because the electrostatic capacitance greatly changes depending on the material of clothes and the like. However, it is impossible to unify the dielectrics between the human body and the electrodes for an unspecified large number of human body seats, because clothes, seating areas, and the like greatly differ from person to person.

Further, in the "malfunction preventing device for sanitary washing device" disclosed in Japanese Patent Laid-Open No. 14534/1992, the heater wire disposed inside the toilet seat is used as one electrode and the ground is used as the other electrode, and an oscillation circuit is provided. Is set to a resonance state by transformer coupling, and the seating of the human body on the toilet seat is detected from the change of the resonance state due to the capacitance (human body-ground) of the human body approaching the transformer. This device can detect the seating of the human body while the heater is operating, but since the heater wire is used as an electrode, the electrode area is small. Therefore, there is a problem that the capacitance value formed by this is small and the sensitivity to the human body capacitance is low. Therefore, it is costly and technically unreasonable to make the electrodes formed by the heater wires into surface electrodes or to make the heater wires denser in order to improve the sensitivity, and to reduce the judgment reference value. When the detection sensitivity is increased by, even if a part of the heater wire is touched by the hand, it is determined to be seated, and especially if the hand is touched during cleaning, it will operate even when it is not needed, which is a big problem in practical use. Had. In addition, this device changes the dielectric constant of the heater wire coating (vinyl chloride, etc.) due to heating of the heater and changes the capacitance value, so the resonance state differs depending on whether the heater is turned on or off, and the judgment reference value is the temperature. There is also a problem in that the device becomes complicated because it is necessary to correct it.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present inventors have made the present invention by focusing on the following points. That is, as one electrode of the capacitance type sensor, attention is focused on an aluminum foil which is a heat conductive conductor that transfers heat of a heater having a large area to a resin plate or the like in place of a heater wire that has been conventionally used. It was thought that if a foil, that is, a heat conductive conductor is used, a significant improvement in sensitivity can be achieved at low cost. further,
If the present inventors use a method of detecting the capacitance between the human body and the ground as a method of detecting a change in the capacitance in combination with the heat conductive conductor electrode, the present invention will be a problem in the conventional technology. I thought that it would be possible to eliminate the effects of body weight and clothing.
According to a detailed experiment by the present inventors, if a method of detecting a capacitance between a human body and the ground is used as a method of detecting a change in capacitance, an adult fat from an infant (more than 5 times in weight difference) Human body capacitance when sitting on the toilet seat is 40-70p
It becomes F, and the change width is small, and it becomes clear that the sensitivity change due to weight is extremely small. If combined with the heat conductive conductor electrode and detecting the electrostatic capacitance between the human body and the ground, it becomes stable. It has become clear that it is possible to detect the seated human body on the toilet seat.

However, if a heat-conductive conductor is used to detect the sitting of a human body with high sensitivity while the heater is operating, as described above, the heater wire coating (vinyl chloride or the like) is formed by heating the heater. There is a big problem that the dielectric constant changes and the electrostatic capacitance value changes remarkably. In order to solve this problem, the inventors of the present invention have conducted more detailed experiments, and if an inductor is inserted in the heater wire, the heater wire can be separated from the AC power supply line in a high frequency, and the influence of the heater heating described above is removed. I confirmed that I could do it.

Further, since the detection sensitivity of the toilet seat seating detection device is improved, the toilet seat seating detection device may be operated by hand when cleaning the toilet seat. Therefore, the inventors of the present invention have focused on a method in which the heat conductive conductor in the toilet seat has a two-divided electrode structure and the human body seating on both electrodes is an AND determination to prevent a malfunction due to a hand when cleaning the toilet seat. planned.

It is an object of the present invention to provide a seating detection device for a toilet seat, which is capable of detecting a stable and reliable seating of the human body on the toilet seat by detecting the electrostatic capacitance between the human body and the ground. And

[0009]

[Means for Solving the Problems]

(Structure of the first invention) A seating detection device for a toilet seat according to the first invention (the invention according to claim 1) includes a heater wire disposed inside the toilet seat, and a heat conductive conductor provided along with the heater wire. An oscillating circuit for generating a high frequency signal, a coupling transformer having an output of the oscillating circuit connected to a primary coil and a secondary coil connected to the signal line, and a coupling coil connected to the primary coil of the coupling transformer. An inductance, a detection circuit for converting a voltage signal from both ends of the inductance into a voltage signal proportional to the amplitude of a high-frequency signal, a determination circuit for comparing the output of the detection circuit with a preset determination standard, and a determination unit for determining the human body sitting, and the heater. From the AC power supply line in a high frequency manner, a coupling means for capacitively coupling the signal ground of the oscillation circuit and the AC power supply line serving as the ground to the ground. Wherein the made be made by.

(Structure of the Second Invention) A seating detection device for a toilet seat according to the second invention of the present invention (an invention according to claim 2) is a heater wire arranged inside the toilet seat, and a heater wire is divided into two parts. First heat transfer conductor, an oscillation circuit for generating a high frequency signal, an output of the oscillation circuit is connected to a primary coil, and a secondary coil is connected to one of the heat transfer conductors. A first inductance connected to the primary coil of the first coupling transformer; a first detection circuit for converting a voltage signal proportional to the amplitude of a high frequency signal from both ends of the first inductance; The output of the first detection circuit is compared with a preset determination reference to determine whether a human body is seated, and the output of the oscillation circuit is connected to the primary coil, and the secondary coil is connected to the heat conductive conductive layer. A second combined tiger connected to the other side of the body Graphics and, of the second coupling transformer 1
A second inductance connected to the secondary coil and the second inductance
A second detection circuit for converting a voltage signal proportional to the amplitude of the high-frequency signal from both ends of the inductance of the second detection circuit, and a second detection circuit for comparing the output of the second detection circuit with a preset determination reference to determine whether a human body is seated. A determination circuit, an AND circuit to which the outputs of the first and second detection circuits are input, an inductor inserted to shut off the heater from the AC power supply line in a high frequency manner, and a signal ground of the oscillation circuit, It is characterized by comprising a coupling means for capacitively coupling the AC power supply line serving as the earth ground.

(Principle of Detection) First, the principle of detection of capacitance in the seat occupancy detection devices of the first and second aspects of the invention will be described below. FIG. 1 shows a sectional structure of a toilet seat and a state of capacitance formed when the toilet seat is seated. Toilet seat 1
Has a structure in which a heat conductive conductor 11 is attached to the inside of a sheet or plate 10 made of ABS resin or the like, and a heater wire 12 covered with a general-purpose resin 13 such as vinyl chloride is bonded onto the heat conductive conductor 11. The heat conductive conductor is a metal or the like that functions to transfer the heat of the heater to the resin or the like arranged inside the toilet seat,
Usually, foil such as aluminum or copper is used. When 100 V AC is applied to the heater wire 12 in such a toilet seat, heat is generated, and the heat is conducted by the heat conductive conductor 11 to heat the entire surface of the resin plate 10. When the human body 2 is seated on the toilet seat 1, the human body-ground capacitance C1, the human body-heat conductive conductor capacitance C3, and the heat conductive conductor-ground electrostatic force are provided between the toilet seat, the human body, and the ground. A capacitance C2 and a heat transfer conductor-heater wire capacitance C4 are formed.

First, when the human body 2 is not present, C2 and C4 exist. C2 varies depending on the size and installation state of the toilet seat, but the measurement by the present inventors is approximately 20 to 30 p.
It is F. Further, C4 is a large value of about 500 pF because the coated resin 13 has a large dielectric constant and the heater wire is long. In the state where the heater wire 12 is connected to the AC line, one of the heater wires is connected to the ground, so C4 becomes the heat conductive conductor-ground capacitance, and the entire heat conductive conductor-ground. Capacitance is C2 + C4
(About 530 pF).

When the human body 2 is seated in this state, C1 and C
A series capacitance of 3 is connected in parallel with the C2 + C4. C1 is a state in which the human body is sitting on the toilet seat, that is, the floor of the toilet is generally not the ground, and therefore the electrostatic capacity is the state in which the human body is floating from the ground. According to experiments by the inventors, a weight of 20 kg to about 100 kg is obtained. 40 pF for human body
Values of ~ 70 pF have been obtained. Further, C3 depends on the contact area between the human body when sitting and the toilet seat, and is a value of about 150 pF to 250 pf in the range of the weight described above. Therefore, the series capacitance of C1 and C3 is about 32 pF to 55 pF.

Therefore, when the human body is seated on about 530 pF of the heat transfer conductor-ground capacitance (C2 + C4), the series capacitance of C1 and C3 (about 32 pF to 55 pF) is connected in parallel. Therefore, in order to detect the seating of the human body with the capacitance type sensor of the present invention, it is necessary to set 530 pF to 3
It must be detected that 2-55 pF are connected in parallel.

According to the experiments conducted by the present inventors, it is difficult to detect seating reliably because the detection sensitivity is insufficient for determining seating of a human body from a change in capacitance of about 10%. It was Therefore, as a method to increase the detection sensitivity of human sitting,
The heater wire 12 was separated from the ground, and the effect of the heat transfer conductor-heater wire capacitance C4 was deleted. That is, since the capacitance formed without the human body 2 is only C2, an inductor is inserted in the heater wire so that the heater wire is in a floating state from the AC power supply line, that is, the ground, in a high frequency manner. As a result, when seated, the series capacitance of C1 and C3 (about 32 pF to 55 pF) is connected in parallel to C2 (30 pF),
Capacitance change about twice or more can be obtained, resulting in extremely high sensitivity.

[0016]

[Action]

(Operation of the First Invention) In the seat occupancy detection device of the first invention, a high-frequency signal is generated from the oscillation circuit and this signal is input to the primary coil of the coupling transformer. One end of the secondary coil of the coupling transformer is connected to a heat conductive conductor of a heater arranged on the inner surface of the resin plate of the toilet seat,
The high frequency signal is applied to the heat conductive conductor via a coupling transformer. An inductance is connected to the other end of the primary coil of the coupling transformer, and a detection circuit for outputting a high frequency signal is connected to both ends of this inductance, and the detection circuit causes the high frequency signal to be proportional to its amplitude. Converted into a voltage signal. Next, the output of the detection circuit is input to the determination circuit. In the judgment circuit, the output of the detection circuit is compared with a preset judgment reference value, and, for example, if the output exceeds the reference value, it is judged that a person is sitting on the body.

An inductor is connected to an AC power supply line for heating the heater, and the inductor cuts off the heater from the AC power supply line at a high frequency. That is, the inductor 4 has a high impedance for a high frequency of several 100 kHz generated from the oscillator circuit 30, and has a low impedance for an alternating current of 60 Hz. Therefore, the heater wire 12 can be set to be in a state of being floated from the AC power supply line with respect to a high frequency, and can be energized at an AC of 60 Hz, and can function as a heater. Further, the AC power supply line is provided with a coupling means for capacitively coupling the signal ground of the oscillation circuit and the AC power supply line constituting the ground earth so as to have a function of sharing a ground.

Further, in the seating detection device for a toilet seat, the secondary coil of the coupling transformer, the heat conductive conductor to the ground,
A resonance circuit is formed in the primary coil of the coupling transformer, and the resonance frequency is determined by the inductance L of the primary coil of the coupling transformer and the capacitance C2 between the heat conductive conductor and the ground. Therefore, when the resonance circuit is set to the resonance state from the oscillation circuit through the coupling transformer in an unmanned state, the human body capacitance is added when the user is seated, the overall capacitance increases, and the resonance frequency shifts. If the frequency of the oscillation circuit is fixed, this resonance shift can be detected as a change in voltage amplitude by the detection circuit. Further, with the LC oscillator circuit configuration, it can be detected as a change in the oscillation frequency. These voltage values or frequency values are input to the determination circuit and compared with a preset reference value to detect the human body sitting.

(Operation of Second Invention) In the seating detection device for a toilet seat according to the second invention, the heat-conductive conductor in the toilet seat is divided into two to form two sets of electrodes, and the heat-conductive conductor and the ground are kept stationary. The electric capacity is 2
Formed a set. As described in the operation of the first aspect of the present invention, by sitting on the human body, highly sensitive capacitance changes can be obtained from the respective electrodes, and the resonance state set by the resonance circuit in the unmanned state and the resonance accompanying the human body sitting The frequency shift can be detected as a voltage change of the resonance circuit corresponding to each electrode. With this device, the human body sitting can be detected only when the human body approaches two sets of electrodes at the same time by inputting the output from the detection circuit and the determination circuit provided for each electrode to the AND circuit. So that In the seat occupancy detection device for a toilet seat according to the second aspect of the invention, as in the case of the first aspect of the invention, since the inductor is inserted in the heater wire and the heater wire is configured to be in a floating state from the AC power supply line, that is, the earth ground in a high frequency, The influence of the electrostatic capacitance formed between the heater and the heat conductive conductor can be eliminated.

[0020]

【The invention's effect】

(Effect of the first invention) The seating detection device for a toilet seat according to the first invention can have a wide electrode area as an electrode for detecting a change in capacitance, instead of the heater used in the conventional device. Since the heat conductive conductor is used, the detection sensitivity of the human body can be increased. In addition, since the heat-conductive conductor provided along with the heater in the toilet seat is used as the sensor electrode, no new means is required and it is simple. Further, since the proximity or contact of the human body electrostatic capacitance to the heat conductive conductor in the toilet seat is detected, there is no malfunction due to water adhesion to the toilet seat.

Further, in this apparatus, an inductor is inserted in the AC power source line (AC100V) for driving the heater to energize low frequency AC (60 Hz), and the number 1 from the oscillation circuit is applied.
The heater is set to the floating state by cutting off the high frequency of 00 kHz. As described above, the heater is adhered to the heat conductive conductor with an adhesive, and when the heater is energized, the dielectric constant of the adhesive changes with a change in temperature, so that the capacitance changes. Since this change in capacitance is larger than the change in capacitance of the human body, it is difficult to determine whether the human body is seated. However, the inductor can eliminate the influence of the capacitance.

Further, since the seating detection device for the toilet seat of the present invention has the resonance circuit structure by the transformer coupling, the coil winding ratio of the transformer can be set arbitrarily, and the capacitance change due to the human body seating is detected as a voltage change of several V order. Therefore, no means such as an amplifier is required and the structure is simplified. Further, in the device of the present invention, the coupling transformer only applies a high frequency of a low voltage and does not apply an AC of 100 V, so that it is small in size, low in capacity and inexpensive. In addition, since the circuit portion and the electrode portion are transformer-coupled by this coupling transformer, insulation between the circuit portion and the electrode portion can be easily obtained, and it is safe against an AC 100V leakage accident or the like.

(Effect of the Second Invention) The seating detection device for a toilet seat of the second invention has the same effects as those described in the effects of the first invention, and also has the following effects. The heat-conducting conductor in the toilet seat has two sets of electrodes divided into two parts so that the human body approach to both electrodes can be detected while the heater is operating.
By adopting the D determination method, it is possible to prevent a malfunction due to a hand when cleaning the toilet seat. That is, in the capacitance type sensor, in order to increase the detection sensitivity so that seating of an infant or the like can be reliably detected, if the reference value of the judgment circuit is lowered, it easily operates when the toilet seat is touched with one hand, that is, when cleaning the toilet seat. Will end up. According to the second aspect of the present invention, it is possible to prevent the device from operating when not needed and wasteful of electric power and the like. Even if the heat-conductive conductor is divided into a plurality of parts to form a plurality of sets of electrodes and a plurality of sets of capacitances between the heat-conductive conductor and the ground are formed, the same manner as in the case where the heat-conductive conductor is divided into two parts. The action and effect of can be obtained.

[0024]

【Example】

(Embodiment 1) An embodiment of the first invention will be described with reference to FIG. The toilet seat seating detection apparatus according to the first embodiment includes a toilet seat 1 and a detection circuit 3. On the inner surface of the resin plate 10 of the toilet seat 1, a heater wire 12 and an aluminum foil 11 which is a heat conductive conductor provided along with the heater wire are arranged. Further, the detection circuit 3 includes an oscillation circuit 30 that generates a high frequency signal, a coupling transformer 31 in which an output of the oscillation circuit 30 is connected to a primary coil, and one end of a secondary coil is connected to the aluminum foil. 1 of the coupling transformer 31
An inductance 32 connected to the next coil, a detection circuit 33 for converting a voltage signal from both ends of the inductance 32 into a voltage signal proportional to the amplitude of a high-frequency signal, and comparing the output of the detection circuit with a preset judgment reference, A detection circuit 3 including a determination circuit 34 for determining the above, an inductor 4 inserted to shut off the heater 12 from the AC power supply line in a high frequency manner, and the AC power supply serving as a signal ground and a ground ground of the detection circuit 3. And a coupling means 5 for electrostatically coupling the line.

According to this structure, first, the inductor wire 4 is inserted into the AC power supply line, so that the heater wire 12 can be cut off from the ground at a high frequency. That is, for a high frequency of several 100 kHz generated from the oscillation circuit 30, the inductor 4 has a high impedance and an alternating current of 6 kHz.
Low impedance for 0 Hz. Therefore, the heater wire 12 can be set to be in a state of being floated from the AC power supply line with respect to a high frequency, and can be energized at an AC of 60 Hz, and can function as a heater. As a result,
Since the capacitance C4 between the heater wire 12 and the aluminum foil 11 described above is not formed, the capacitance as the toilet seat is only C2 between the aluminum foil 11 and the ground. In this state, the high frequency signal from the oscillator circuit 30 is coupled to the transformer 3
It is applied to the aluminum foil 11 via 1 and is tuned to the resonance frequency determined by the inductance L of the secondary coil of the coupling transformer 31 and the C2. The resonance characteristic of this resonance circuit is as shown in FIG. 3, and the maximum voltage is obtained at the resonance frequency point f ₀ .

When the human body 2 sits on the toilet seat in this resonance state, the electrostatic capacitance C1 of the human body is connected in parallel, so that the overall capacitance increases and the resonance frequency shifts to the lower side. However, if the oscillation frequency of the oscillation circuit 30 is shifted from the resonance point and fixed to fa, the voltage of the resonance circuit changes from e0 to e1, so that the human body sitting can be detected as a change in the resonance circuit voltage. This voltage change is detected from both ends of the inductance 32 and converted into a DC voltage by the detection circuit 33. The output of the detection circuit 33 is input to the determination circuit 34, compared with a preset determination reference value,
It is for detecting the sitting of a human body.

Further, the electrostatic coupling means 5 couples the detection circuit 3 to the aluminum foil-ground capacitance C2, so that the signal ground of the detection circuit 3 and the AC power supply line serving as the ground are electrostatically coupled. Performs a capacitive coupling action.

FIG. 4 shows a specific seating detection example of the seating detection device having the above-described structure and operation. When the output of the detection circuit 33 in an unmanned state when the oscillation frequency of the oscillation circuit 30 is set to about 500 kHz is set to about 0.6 V, the weight is 40 to 100.
A voltage of about 1 to 1.2 V was obtained for a kg adult, and a voltage of about 0.9 V was obtained for a child weighing about 20 kg. Therefore, the reference value of the judgment circuit 34 is 0.8V.
If set to the position, it becomes possible to detect the seating of children to adults when the heater is activated.

(Embodiment 2) Next, an embodiment of the second invention will be described with reference to FIG. The same symbols are assigned to the parts that provide the same effects as the device of the first embodiment, and the detailed description will be omitted. The toilet seat seating detection apparatus according to the first embodiment includes a toilet seat 1 and a detection circuit 3. On the inner surface of the resin plate 10 of the toilet seat 1, there is a heater wire 12 and an aluminum foil 11a which is a heat conductive conductor divided into two parts provided in parallel with the heater wire.
And 11b are provided. Further, the detection circuit 3 includes an oscillation circuit 30 that generates a high frequency signal, and a first coupling in which the output of the oscillation circuit 30 is connected to a primary coil and one of the secondary coils is connected to the aluminum foil 11a. A transformer 31a, a first inductance 32a connected to the primary coil of the coupling transformer 31a, a first detection circuit 33a for converting a voltage signal proportional to the amplitude of a high frequency signal from both ends of the inductance 32a, Detection circuit 33
The output of a is compared with a preset determination criterion, and the first determination circuit 34a for determining the sitting of the human body and the output of the oscillation circuit 30 are connected to the primary coil, and one of the secondary coils is connected to the aluminum foil 11b. A second coupling transformer 31b connected to the second transformer, a second inductor 32b connected to the primary coil of the coupling transformer 31b, and a voltage signal proportional to the amplitude of the high frequency signal from both ends of the inductance 32b. The second detection circuit 33b and the detection circuit 3
Detection composed of a second judgment circuit 34b for judging the human body sitting by comparing the output of 3b with a preset judgment criterion, and an AND circuit 35 to which outputs of the first and second detection circuits are inputted. Coupling means for electrostatically coupling the circuit 3a, the inductor 4 inserted to shut off the heater 12 from the AC power supply line in a high frequency manner, and the AC power supply line serving as the signal ground of the detection circuit 3 and the ground. 5 and.

According to this structure, since the aluminum foil in the toilet seat has a two-divided electrode structure, two sets of aluminum foil-ground capacitance are formed. Therefore, by performing an AND determination on both electrodes, that is, by determining a reliable sitting state in which both thighs are applied to the toilet seat and using the sitting signal, it is possible to prevent a malfunction due to contact with the toilet seat with one hand when cleaning the toilet seat, and when the heater is operating, A stable seating signal can be obtained, and the reliability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a sectional structure of a toilet seat and a state of capacitance formed when the toilet seat is seated.

FIG. 2 is a schematic diagram of a circuit of the seating detection device for a toilet seat according to the first embodiment.

FIG. 3 is a diagram showing resonance characteristics for explaining the principle of the invention.

FIG. 4 is a diagram showing an example of human body seating detection by the toilet seat seating detection apparatus according to the first embodiment.

FIG. 5 is a schematic diagram of a circuit of a seating detection device for a toilet seat according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Toilet seat 2 ... Human body 3, 3a ... Detection circuit 4 ... Inductor 5 ... Electrostatic coupling means 10 ... Resin plate 11, 11a, 11b ... Aluminum foil 12. ..Heater 30 ... High frequency oscillator 31, 31a, 31b ... Coupling transformer 32, 32a, 32b ... Inductance 33, 33a ... Detection circuit 34, 34a ... Judgment circuit 35 ... AND circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Kaneko 2-1-1 Asahi-cho, Kariya city, Aichi Prefecture Aisin Seiki Co., Ltd.

Claims (2)

[Claims] 1. A heater wire disposed inside a toilet seat, a heat conductive conductor provided along with the heater wire, an oscillation circuit for generating a high frequency signal, and an output of the oscillation circuit is connected to a primary coil. A coupling transformer in which a secondary coil is connected to the heat conductive conductor, an inductance connected to the primary coil of the coupling transformer, and a voltage signal proportional to the amplitude of a high frequency signal is converted from both ends of the inductance. A detection circuit, a determination circuit for comparing the output of the detection circuit with a predetermined determination reference to determine the sitting of the human body, an inductor inserted to shut off the heater from an AC power line at high frequencies, and the oscillation circuit Seating detection device for a toilet seat, which comprises a coupling means for capacitively coupling the signal ground of (1) and the AC power supply line serving as the ground. 2. A heater wire arranged inside a toilet seat, a two-piece heat conductive conductor provided along with the heater wire, an oscillation circuit for generating a high frequency signal, and an output of the oscillation circuit is a primary coil. A first coupling transformer having a secondary coil connected to one of the heat conductive conductors, a first inductance connected to the primary coil of the first coupling transformer, and A first detection circuit for converting a voltage signal proportional to the amplitude of a high frequency signal from both ends of the inductance of the first detection circuit and a first detection circuit for comparing the output of the first detection circuit with a preset determination standard to determine the human sitting A determination circuit, a second coupling transformer in which the output of the oscillation circuit is connected to a primary coil, and a secondary coil is connected to the other of the signal lines, and a primary coil of the second coupling transformer. The second inductance that is A second detection circuit for converting a voltage signal proportional to the amplitude of a high-frequency signal from both ends of the second inductance and an output of the second detection circuit are compared with preset determination criteria to determine whether a human body is seated. A second determination circuit and an AN to which outputs of the first and second detection circuits are input
Coupling means for capacitively coupling the D circuit, the inductor inserted to cut off the heater from the AC power supply line in a high frequency manner, the signal ground of the oscillation circuit, and the AC power supply line serving as the ground. A seating detection device for a toilet seat, comprising: