JP2001194450A - Mobile object detector, toilet apparatus and toilet chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit highly reliable detection by preventing a signal mixed from other signal generating source from being taken in as a reference signal for obtaining frequency difference from a reflected wave of a transmitting wave from the self device. SOLUTION: An oscillation circuit 21 forms an oscillation signal B at a prescribed frequency in a designated frequency band, and radiates the signal as a radio wave in the prescribed direction through a transmitting antenna. The oscillation signal B is simultaneously outputted from the oscillating circuit 21 to a conversion circuit 25 through a signal transmission line in an apparatus. A receiving circuit 23 receives a radio wave, which is radiated as a radio wave from the transmitting antenna and reflected from a mobile body 29, as a receiving signal B through a receiving antenna, and outputs the signal to the conversion circuit 25, which reads the receiving signal A and the oscillating signal B. The conversion circuit 25 obtains frequency difference |A-B| (Doppler frequency) between the oscillating signal B set as a reference signal and the receiving signal A, and leads out the frequency difference as a detected signal, which is outputted to a signal processing circuit 27. It reads the detected signal and performs prescribed signal processing operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a movable body detecting device,
The present invention relates to a toilet device and a toilet room.

[0002]

2. Description of the Related Art In general, when a movable body detecting device using radio waves is used as a human body detecting device, it is effective to set the frequency band of an electromagnetic wave to be used at 1 GHz to 100 GHz. A representative example of such a human body detection device is a Doppler sensor using the Doppler effect by radio waves (particularly, microwaves or millimeter waves). The above-mentioned Doppler sensor is applied to, for example, a traffic volume survey, an underground search, an automatic door system, a speed gun, and the like.

The principle of human body detection by a Doppler sensor utilizing the above-described Doppler effect by radio waves is as follows (1).
It is shown by the formula.

ΔF = Fs−Fb = 2 × Fs × v / c (1)

In equation (1), ΔF is the Doppler frequency (about 5 to 200 Hz), and Fs is the frequency of the transmission wave (transmission frequency), which is about 10.525 GHz.
Fb is the frequency of the reflected wave (reflection frequency), v is the walking speed of a person, and C is the speed of light (300 × 10 6 m / s).

FIG. 1 is an explanatory view of the principle of human body detection by a Doppler sensor utilizing the above-described Doppler effect by radio waves, and shows an example in which the above-mentioned Doppler sensor is installed on the upper front of a male urinal. FIG. 2 is a block diagram showing a functional configuration of the Doppler sensor.

In FIG. 1, reference numeral Fs denotes a transmission wave from the antenna of the Doppler sensor 1, and reference numeral Fb denotes a transmission wave Fs generated by reflecting the transmission wave Fs on a human body (pedestrian) 5 facing the male urinal 3. This is a reflected wave that has undergone a Doppler frequency shift due to relative motion (walking speed of the pedestrian 5) v. As shown in FIG. 2, the reflected wave Fb
, While the transmission wave F from the transmission device 7
s is read into the receiving device 9 as a reference signal. And
In the difference detection circuit 11, ΔF (Doppler frequency), which is a frequency difference between the reflected wave Fb and the transmission wave Fs, is extracted as a detection signal, and is output through the bandpass filter 13.

Since the distance between the antenna and the human body 5 is inversely proportional to the amplitude of the Doppler frequency ΔF, the position of the human body 5 can be detected if the value of ΔF is known. In addition, by analyzing the frequency spectrum of the Doppler frequency ΔF, it is possible to detect whether the human body 5 is approaching or away from the male urinal 3 (moving direction of the human body 5). The Doppler signal (Doppler frequency) ΔF is about 67 Hz when the transmission wave Fs is 10 GHz and the walking speed v of the human body 5 is 1 m / s. The running speed is 100 km / h.
In the case of the car, the frequency is 1,852 Hz. If the band frequency of the band filter 13 is set according to the measurement object, other radio waves mixed as noise can be cut.

[0009]

As described above, FIG.
By setting the band frequency of the band-pass filter 13 shown in accordance with the application of the Doppler sensor 1, it is possible to cut most of the noise mixed in the Doppler signal ΔF in the Doppler sensor 1 having the above configuration.

However, the frequency Fb 'substantially equal to the reflected wave Fb
A radio wave transmission source (not shown) for transmitting a radio wave having
In the case where the Doppler sensor 1 is accidentally installed near the Doppler sensor 1, the radio wave source causes interference with the Doppler sensor 1, and as a result, the Doppler sensor 1
Causes a malfunction. In other words,
The reception device 9 is not the transmission wave Fs from the transmission device 7 but the radio wave Fb ′ from the radio wave transmission source (not shown).
Is read as a reference signal, the difference detection circuit 11
Extracts the frequency difference between the reflected wave Fb and the radio wave Fb 'as a detection signal, and outputs the detection signal through the bandpass filter 13. Therefore, for example, it outputs a signal indicating that the human body 5 is present when the human body 5 is not present in front of the male urinal 3 or indicates that the human body 5 is approaching even though it is moving away from the male urinal 3. There is a problem that the reliability of the Doppler sensor such as outputting a signal or erroneously detecting the walking speed of the human body 5 is lowered.

[0011] The above problem is caused by arranging a large number of male urinals in a relatively narrow space, such as a men's toilet room of an office building, and installing the Doppler sensor having the above-mentioned configuration in each of the male urinals. It occurs remarkably in the case where it is done. Also,
Even in a case where only one Western-style toilet device is installed in a private room, a plurality of Doppler sensors may be installed in one toilet device depending on the application, so even in such a case, Interference between the sensors becomes a problem.

In addition, in the case of the Doppler sensor having the above-mentioned configuration, the frequency that can be used is restricted to a specific frequency band by the Radio Law so that various public works such as speed control by the police are not hindered. . Therefore, there is a high possibility that the above-described malfunction occurs in each sensor due to the above-described interference between the sensors.

Accordingly, an object of the present invention is to prevent a signal which can be mixed as noise from another signal generation source from being taken in as a reference signal for obtaining a frequency difference from a reflected wave of a transmitted wave from the own device. Accordingly, an object of the present invention is to provide a movable body detection device capable of performing highly reliable detection.

Another object of the present invention is to use a Doppler sensor utilizing the Doppler effect by radio waves as a movable body detecting device in an environment in which the movable body detecting devices are provided side by side. An object is to prevent interference from occurring between each other.

[0015]

According to a first aspect of the present invention, there is provided a movable body detecting device for externally generating a signal to be transmitted as a radio wave, and receiving a signal transmitted as a radio wave from the outside. Means, while reading the received signal, determine the difference between the transmission signal and the frequency of the reception signal, and directly from the transmission signal generation means as a reference signal necessary to generate a signal corresponding to the difference. Signal generating means for reading.

According to the above arrangement, the signal generation means obtains a difference from the frequency of the received signal, and directly transmits the transmission signal from the transmission signal generation means as a reference signal required to generate a signal corresponding to the difference. Since reading is performed, it is possible to prevent a signal that can be mixed as noise from another signal generation source from being taken in as a reference signal for obtaining a frequency difference between the reflected wave of the transmitted wave and the reflected wave from the own device.

According to a second aspect of the present invention, there is provided a movable body detecting apparatus, comprising: means for generating a signal to be transmitted as a radio wave to the outside; means for receiving a signal transmitted from the outside as a radio wave; Thus, the transmission signal received together with the signal transmitted from the outside as a radio wave is obtained together with the received signal as a reference signal necessary for generating a signal corresponding to the difference from the frequency of the received signal. A signal generation unit; and a unit that variably adjusts a frequency of the transmission signal generated by the transmission signal generation unit.

In a preferred embodiment according to the second aspect of the present invention, the variably adjusted frequencies are a plurality of predetermined frequencies. The frequency of the transmission signal may be variably adjusted using a plurality of frequencies having different values. Further, the frequency of the transmission signal can be variably adjusted by a command signal from a remote controller.

According to a third aspect of the present invention, there is provided a movable body detecting apparatus comprising: means for externally generating a signal to be transmitted as radio waves; means for receiving a signal transmitted from the outside as radio waves; Thus, the transmission signal received together with the signal transmitted from the outside as a radio wave is read together with the reception signal as a reference signal necessary for generating a signal corresponding to the difference from the frequency of the reception signal. And a means for controlling the transmission signal generation means and prohibiting reception of the signal by the reception means when the transmission signal generation means does not generate the transmission signal.

In a preferred embodiment according to the third aspect of the present invention, a transmission signal radiated to the outside as a radio wave is radiated intermittently. The emission time interval of the transmission signal can be set to an arbitrary time interval. Further, the emission time interval of the transmission signal can be variably adjusted by a command signal from a remote controller.

According to a fourth aspect of the present invention, there is provided a movable body detecting apparatus comprising: means for externally generating a signal to be transmitted as a radio wave; means for receiving a signal transmitted from the outside as a radio wave; A signal to be read together with the received signal as a reference signal required to determine a difference between the frequency of the received signal and the transmission signal received together with the signal transmitted from the outside as a radio wave, and to generate a signal corresponding to the difference. A generating unit and a unit externally limiting a radiation space area of a transmission signal radiated as a radio wave and a reception space area of a radio wave transmitted from the outside.

According to a fifth aspect of the present invention, there is provided a movable body detecting apparatus comprising: means for externally generating a signal to be transmitted as a radio wave; means for receiving a signal transmitted from the outside as a radio wave; A signal to be read together with the received signal as a reference signal required to determine a difference between the frequency of the received signal and the transmission signal received together with the signal transmitted from the outside as a radio wave, and to generate a signal corresponding to the difference. Generating means; and means for determining that reading of the received signal by the signal generating means is valid only when the amount of change in the received signal transmitted from the outside as a radio wave exceeds a predetermined threshold.

According to a sixth aspect of the present invention, there is provided a movable body detecting apparatus comprising: means for externally generating a signal to be transmitted as a radio wave; means for receiving a signal transmitted from the outside as a radio wave; A signal to be read together with the received signal as a reference signal required to determine a difference between the frequency of the received signal and the transmission signal received together with the signal transmitted from the outside as a radio wave, and to generate a signal corresponding to the difference. And a means for assuming that only the reading of the received signal having the same continuous waveform as the transmission signal among the reading of the received signal by the signal generating means is valid.

[0024] A toilet apparatus according to a seventh aspect of the present invention comprises:
A plurality of movable body detection devices using radio waves are arranged so as not to cause mutual interference.

In a toilet room according to an eighth aspect of the present invention, in an environment in which a plurality of toilet devices are arranged side by side, each toilet device is installed for each toilet device, and a movable body detection using radio waves is performed. The devices are arranged so as to prevent interference between the devices.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a block diagram showing the internal configuration of the movable body detecting device according to the first embodiment of the present invention.

The above device performs a detection operation using the Doppler effect by radio waves. As shown in FIG. 3, a transmitting circuit 21, a receiving circuit 23, a converting circuit 25, and a signal processing circuit 27 are used. Prepare.

The transmitting circuit 21 generates a transmitting signal B of a predetermined frequency within a designated frequency band, and radiates (transmits) the transmitting signal B as a radio wave in a predetermined direction through a transmitting antenna (not shown). The transmission signal B is simultaneously transmitted from the transmission circuit 21 to the conversion circuit 25 through a signal transmission path inside the device.
Is output to

The receiving circuit 23 radiates radio waves from the transmitting antenna (not shown) and outputs a radio wave to a movable body (human body) 29.
Is received as a reception signal A through a reception antenna (not shown) and output to the conversion circuit 25.

The conversion circuit 25 reads the received signal A and the transmitted signal B, respectively, and uses the transmitted signal B as a reference signal to obtain a frequency difference | AB | between the received signal A and the transmitted signal B as a reference signal. (Doppler frequency) is obtained, and the obtained frequency difference is extracted as a detection signal. Then, the detection signal is output to the signal processing circuit 27.

The signal processing circuit 27 reads the detection signal and executes, for example, noise component removal and a predetermined signal processing operation.

According to the above configuration, the transmission signal B output from the transmission circuit 21 to the conversion circuit 25 through the signal transmission line inside the device is used as the reference signal for obtaining the frequency difference from the reception signal A. Therefore, it is possible to prevent a signal mixed from another radio wave generation source from being misused as a reference signal. Therefore, even if a radio wave generation source that emits a radio wave having a frequency close to the frequency of the reflected wave of the transmission wave from the own device as a transmission signal is installed nearby, a malfunction does not occur due to the malfunction.

FIG. 4 is a block diagram showing a main part of an internal configuration of a movable body detecting device according to a second embodiment of the present invention.

The device according to the present embodiment has, in addition to the configuration shown in FIG. 3, an adjusting circuit 31 connected between the transmitting circuit 21 and the transmitting antenna (not shown) in FIG. And a plurality of switches 331 to 33n (331 to 338 in FIG. 4). Note that the device according to the present embodiment has a configuration in which the reception circuit 23 (shown in FIG. 3) reads the transmission signal radiated from the transmission antenna (not shown) through the reception antenna (not shown) as the above-described reference signal. Has become.

The switches 331 to 338 output the frequency of the high-frequency signal of, for example, about 10 GHz output from the transmitting circuit 21 to, for example, 10 MHz which is 1/1000 of the frequency.
It is operated selectively when fine adjustment (variable frequency) is performed in units, and all have normally open (NO) contacts.

In the above configuration, for example, the switch 33
When 1 is input, the high-frequency signal of 10 GHz from the transmission circuit 21 is changed to a high-frequency signal of 10.001 GHz in the adjustment circuit 31 and applied to a transmission antenna (not shown). Next, when the switch 332 is turned on, a high-frequency signal of 10.02 GHz is generated in the adjustment circuit 31 and applied to the transmitting antenna (not shown). Thus, when the switch 333 is turned on, a high frequency signal of 10.003 GHz is output to the switch 334.
When the switch 335 is turned on, a high frequency signal of 10.004 GHz is output.
A high frequency signal of Hz is applied from the adjustment circuit 31 to a transmitting antenna (not shown). In addition, switch 336
Is turned on, a high frequency signal of 10.006 GHz is turned on, and when the switch 337 is turned on, a signal of 10.007 GHz is turned on.
When the switch 338 is turned on, a high frequency signal of 10.08 GHz is output to the adjustment circuit 3.
1 to a transmitting antenna (not shown).

According to the present embodiment, the frequency of the transmission signal generated by the transmission circuit 21 can be finely adjusted. Therefore, even if a radio wave generation source that emits a radio wave of a frequency of about 10 GHz is installed near the device, the switch 33
By selectively applying any one of 1 to 338, a transmission signal having a frequency that does not cause mutual interference with the transmission signal from the radio wave generation source can be supplied to the transmission antenna through the adjustment circuit 31. Therefore, it is possible to prevent the device from malfunctioning due to a signal transmitted from a nearby radio wave generating source.

In the above embodiment, each switch 33
Although the frequency of the transmission signal output from the adjustment circuit 31 is determined in advance for each of 1 to 338, each of the switches 331 to 338
If a transmission signal of a different frequency is output every time, it is not necessary to determine the value of the frequency in advance.

FIG. 5 is a block diagram showing a main part of an internal configuration of a movable body detecting device according to a third embodiment of the present invention.

The device according to the present embodiment has, in addition to the configuration shown in FIG. 3, a switch 35 between the transmitting circuit 21 and the transmitting antenna 37 in FIG.
3 and a control circuit 43 for controlling the transmission circuit 21 and the switches 35 and 41, respectively.
Is also provided. Note that, also in the device according to the present embodiment, the transmission signal radiated from the transmission antenna 37 is configured to be read by the reception circuit 23 through the reception antenna 39 as the above-described reference signal.

Each of the switches 35 and 41 has a normally open (NO) contact, and is configured to perform an open / close operation in conjunction with each other under the control of the control circuit 43. The transmission operation of the transmission circuit 21 is also controlled by the control circuit 43.

The control circuit 43 closes both the switches 35 and 41 only when driving the transmission circuit 21, and holds both the switches 35 open when the driving of the transmission circuit 21 is stopped.

According to the above configuration, the switches 35 and 41 are closed only when the transmission circuit 21 emits a transmission signal to the outside through the transmission antenna 37. Therefore, the receiving circuit 23
When the transmission circuit 21 is stopped, even if a transmission signal from a nearby radio wave generation source is received by the receiving antenna 39, the transmission signal can be prevented from being read as a reference signal.

FIG. 6 is a waveform diagram of a transmission signal according to a first modification of the third embodiment shown in FIG.

In this modification, as shown in FIG. 6, the control circuit 43 transmits the signal so that the transmission signal is intermittently radiated from the transmission antenna 37 at time intervals T1, T2,. It is characterized in that the transmission operation of the circuit 21 is controlled. In this modification, the above time intervals T1, T2,.
Are set equal. In this modification, the switches 35 and 41 described above are controlled by the control circuit 43 so as to be closed only when the transmission circuit 21 is driven.

According to this modification, the transmitting signal is intermittently radiated from the transmitting antenna 37, and the receiving circuit 23 is controlled by the receiving antenna 39 in accordance with the intermittent transmitting signal emission.
Decided to read the received signal. Therefore, even if an emission signal of the same frequency as the above emission signal is emitted from a nearby radio wave generation source, and even if that time overlaps with one of the emission times of any of the above emission signals, a plurality of emission signals are generated at sufficiently short time intervals. By taking the average value of the signals received twice and using it as the above-mentioned reference value, unless the emission time interval patterns of the transmission signals match each other, the device transmits the transmission signal from the radio wave generation source. This can prevent malfunction.

The above time intervals T1, T2,..., Tn
Can be changed without being uniquely set, the pattern of the emission time interval of the signal transmitted from the above device and the pattern of the emission time interval of the signal transmitted from a nearby radio wave generation source can match. Therefore, the probability of the device malfunctioning due to the signal transmitted from the radio wave generation source can be further reduced.

Further, in an environment where a plurality of movable body detecting devices having the structure shown in FIG. 5 are juxtaposed at relatively close positions,
Even if the pattern of the emission time interval of the transmission signal provided to each movable body detection device is not changed and the pattern of the emission time interval is shifted and set for each device, the probability that each device malfunctions is further reduced. be able to.

FIG. 7 is a front view of a movable body detecting device main body according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view of the movable body detecting device main body shown in FIG. is there.

The movable body detecting device according to this embodiment includes a sensor substrate 47 on which the device main body 45 mounts the above-described electric and electronic circuit components, and a cover member 49 of the sensor substrate 47 formed of an electromagnetic wave shielding material. It consists of.
The cover member 49 includes the antenna 37 (39) (the transmitting antenna 37 and the receiving antenna 3) attached to the sensor substrate 47.
A window 51 for radiating outgoing signals to the outside and receiving radio waves from outside is formed in a portion corresponding to 9). The size and shape of the window 51 are determined according to the emission range of the transmitted signal (radio wave). Radio waves are similar to light,
It has the property of traveling straight, so that depending on how the size and shape of the window 51 is set, the width of the emission signal is radiated,
The reach can be limited.

The size and shape of the window 51 are determined in consideration of the lateral width and the reach of a signal emitted from the movable body detecting device so that a large number of movable body detecting devices having the above configuration can be installed in a relatively small space. If set, it is possible to prevent interference between devices even in an environment where many male urinals are juxtaposed in a relatively narrow space or in an environment where many devices are installed in one toilet device. it can.

FIG. 9 is a perspective view of the toilet apparatus with the hot water flush toilet seat provided with the movable body detecting device shown in FIGS. 7 and 8, as viewed from the front. FIG. 10 is a side view of the toilet apparatus shown in FIG. FIG. 11 is a plan view of the toilet device shown in FIG.

9 to 11, an area 53 indicated by a broken line indicates a range of radiation of the radio wave from the movable body detecting device 45 described above. Depending on the size and shape of the window 51 shown in FIGS. 7 and 8, the radio wave radiation range 53 rises from the human body approaching the toilet device 55 and trying to sit on the toilet seat 57, or rising from the toilet seat 57. The angle is limited to an angle at which a human body trying to move away from the toilet device 55 can be detected.

In the toilet device 55 having the above configuration, a plurality of devices having the same configuration as the device 45 are installed at other portions of the toilet device 55 or at appropriate places in the room where the toilet device 55 is installed. There is. Therefore, by limiting the range of radio waves emitted from the device 45, radio waves are prevented from reaching other devices as much as possible,
It is necessary to limit the reception range of the radio wave reaching to prevent reception of the radio wave transmitted from another device. By using the device 45 having the configuration shown in FIGS. 7 and 8,
Interference between the devices can be prevented.

FIG. 12 shows a male urinal in which a plurality of movable urinal detecting devices using a received transmission signal as a reference signal can be installed in each of a plurality of juxtaposed male urinals without interference between the devices. FIG. 4 is an explanatory diagram showing an example of an arrangement pattern.

In the example shown in FIG.
A plurality (four in the example of FIG. 12) of men's urinals 61a, 61b, 61c, 61d are arranged in a line at predetermined intervals along one of the wall surfaces. Similarly, a plurality of (four) male urinals 61e, 6 along the other wall surface
1f, 61g, and 61h are also arranged in a row in a so-called staggered manner with respect to the male urinals 61a to 61d, also at predetermined intervals.

Each urinal described above (61a-61d, 61
The distance between e to 61h) is set to a distance at which no interference occurs between the movable body detection devices of the adjacent urinals. In FIG. 12, regions indicated by reference numerals 63a to 63h indicate the emission ranges of radio waves from the movable body detection devices installed in the urinals 61a to 61h, respectively.

As described above, between the urinal 61a and the urinal 61e, between the urinal 61b and the urinal 6b.
Between the device 1f, the urinal 61c and the urinal 61g
Between the urinal and the urinal 61d and the urinal 61h
The corresponding urinals are arranged in a so-called staggered manner between the devices. Therefore, for example, urinal 61
The transmission signal from the device of the urinal 61e is received as the reference signal of the device of the urinal 61e, and the transmission signal from the device of the urinal 61e is received as the reference signal of the device of the urinal 61a. Trouble is unlikely to occur.

FIG. 13 shows a male urinal in which a plurality of movable urinal detecting devices using a received transmission signal as a reference signal can be installed in each of a plurality of juxtaposed male urinals without interference between the devices. FIG. 8 is an explanatory diagram showing another example of the arrangement pattern of FIG.

In the example shown in FIG. 13, the urinals 61a to 61a-6 extend along the left side wall and the right side wall when viewed from the upper wall in the figure.
1h are arranged at equal intervals, and the passage of radio waves from each urinal device on the left side is blocked in order to prevent it from reaching each urinal device on the right side and vice versa. A partition 65 made of an electromagnetic shielding material is installed at the center of the toilet room.

According to the above configuration, the same effect as in the arrangement pattern shown in FIG. 12 can be obtained.

FIG. 14 shows a male urinal in which a plurality of movable urinal detecting devices using a received transmission signal as a reference signal can be installed in each of a plurality of juxtaposed male urinals without interference between the devices. FIG. 9 is an explanatory view showing still another example of the arrangement pattern of FIG.

In the example shown in FIG. 14, the urinals 61a to 61d are arranged at equal intervals only along the left wall surface (that is, one side wall surface) when viewed from the upper wall surface in the figure.

With the above configuration, the same effects as those in the arrangement patterns shown in FIGS. 12 and 13 can be obtained.

FIG. 15 is a diagram showing an output waveform from the movable body detecting device according to the fifth embodiment of the present invention.

FIG. 15A shows a signal waveform having a constant amplitude and period, and FIG. 15B shows a signal waveform having a variable amplitude and period.

For example, when a human body approaches or moves away from a toilet device provided with a movable body detection device, the above-described Doppler signal is generated in the movable body detection device. If the human body approaches the toilet device at the same walking speed, the amplitude of the above-described reflected wave gradually increases, and if the human body moves away from the toilet device at the same walking speed, the amplitude of the above-described reflected wave gradually decreases, contrary to the above. . In addition, the frequency of the Doppler signal changes in accordance with the shaking of the human body, such as when the human body is adding small items in the toilet device.

Therefore, if the above-described high-frequency signal is transmitted from the movable body detecting device installed in the toilet device, the signal reflected back to the human body is received, and the Doppler signal is detected therefrom, It is possible to detect whether the amplitude or frequency of the Doppler signal has changed or whether it has changed with time.

Therefore, in the present embodiment, in the above-described movable body detecting device, a threshold value relating to the change amount of the amplitude of the Doppler signal and a threshold value relating to the change amount of the frequency of the Doppler signal are set in advance. A Doppler signal whose amount of change in frequency and frequency is equal to or less than the respective thresholds is ignored because it is not correct detection.

Therefore, the signal waveform shown in FIG. 15A represents a Doppler signal in which both the variation in amplitude and the variation in frequency are equal to or less than the respective threshold values, and is a signal transmitted from another device. Is determined and ignored. On the other hand, FIG.
The signal waveform shown in (b) has an amplitude variation β (= C /
D), since both the frequency change amount (period change amount α = A / B) are equal to or larger than the respective threshold values, they are read as effective Doppler signals.

FIG. 16 is a block diagram showing a main part of an internal configuration of a movable body detecting device according to a sixth embodiment of the present invention.

The device according to the present embodiment includes, in addition to the configuration shown in FIG. 3, a waveform determination circuit 67 for determining the waveform of a received signal read by the reception circuit 23 of FIG. It is characterized by having. Note that, also in the device according to the present embodiment, the transmission signal radiated from the transmission antenna 37 is configured to be read by the reception circuit 23 through the reception antenna 39 as the above-described reference signal.

In this embodiment, the transmission signal radiated from the transmission circuit 21 through the transmission antenna 37 is 10 GHz.
Transmitted continuously at a frequency in the band of ~ 11 GHz. On the other hand, the waveform determination circuit 67 selects the same continuous waveform as the transmission signal (that is, the reception signal ± α (= Doppler wave)) from the signals received by the reception circuit 23 through the reception antenna 39.
Only the data is extracted and output to the conversion circuit 25 shown in FIG. By performing such signal processing, it is possible to prevent the transmission signal radiated from another device from interfering with the device.

FIG. 17 is a block diagram showing a main part of an internal configuration of a movable body detecting device according to a seventh embodiment of the present invention.

The device according to the present embodiment includes a transmission circuit 21
(Shown in FIG. 3), which incorporates a DS (Direct Spreading Method) modulation circuit configuration, in which a carrier is digitally modulated by transmission data, and then the carrier after digital modulation is spread modulated. ing. Here, the DS system is a type of SS communication, which is a kind of SS communication and has confidentiality and interference resistance, which is also used in mobile phone systems and GPS.
This is a typical communication method of the DMA method.

As shown in FIG. 17, the DS modulation circuit according to the present embodiment comprises a primary modulation circuit 69 for reading transmission data, a carrier generation unit 71 connected to the primary modulation circuit 69, The output side of the next modulation circuit 69 and the transmitting antenna 3
7 and a spreading code generation unit 75 connected to the secondary modulation circuit 73.

As described above, the primary modulation circuit 69 digitally modulates the transmission data itself, that is, digitally modulates the carrier supplied from the carrier generation unit 71 with the input transmission data, and outputs the carrier to the secondary modulation circuit 73. I do. The secondary modulation circuit 73 performs spread modulation, and the spread code generation unit 75
SS using a pseudo-random data stream at a higher rate than the symbol rate referred to as the spreading code supplied from
Perform modulation. This causes the original signal spectrum (digitally modulated carrier) to be spread over a wider band using the spreading code (ie, pseudo-random data), resulting in a signal that is more robust to noise. become. The spread modulated signal is radiated from the transmitting antenna 37 to the outside.

In the movable body detecting device according to this embodiment, the frequency of the transmission signal according to the output signal from the remote controller (remote controller) (not shown), and the emission time interval of the transmission signal when the transmission signal is intermittently radiated Can be freely changed.

Therefore, as shown by the signal spectrum of the transmitted signal in FIG. 18A, devices A, B, and C that emit transmitted signals having substantially the same frequency band and different intensities are installed in the vicinity. In this case, by operating the remote controllers of the respective devices A, B, and C, the emission time intervals of the transmission signals from the individual devices are shifted as shown in the timing chart of the transmission signals in FIG. Interference between A, B, and C hardly occurs. Even if the emission timings of the transmission signals coincide between the devices ABC, an average value of the signals received a plurality of times at sufficiently short time intervals is taken and used as the above-mentioned reference value. If you do
As long as the patterns of the emission time intervals of the transmission signals do not match, it is possible to prevent the device from malfunctioning due to the transmission signal from the radio wave generation source.

FIG. 19 is a block diagram showing a main part of an internal configuration of a movable body detecting device according to a modification of the seventh embodiment of the present invention.

In this modification, first, an exclusive OR circuit 77
Reads the transmission data and the spreading code from the spreading code generation unit 75 and performs spread modulation (SS modulation). Then, the digital modulation circuit (primary modulation circuit) 69 outputs the output signal from the exclusive OR circuit 77. Digitally modulates the carrier supplied from the carrier generation unit 71 by the
Is different from the above embodiment. Other configurations are
This is the same as the device in FIG.

The contents described above relate to each embodiment of the present invention and modifications thereof, and do not mean that the present invention is limited only to the above contents.

[0084]

As described above, according to the present invention,
A movable type that can perform highly reliable detection by preventing a signal that can be mixed as noise from another signal source from being taken in as a reference signal for obtaining a frequency difference from a reflected wave of a transmitted wave from the own device. A body detection device can be provided.

Further, according to the present invention, when a Doppler sensor utilizing the Doppler effect by radio waves is used as a movable body detecting device, in a case where the movable body detecting device is juxtaposed, the sensors are connected to each other. Interference can be prevented from occurring between them.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the principle of human body detection by a Doppler sensor using a Dopping effect by radio waves.

FIG. 2 is a block diagram showing a functional configuration of a Doppler sensor using a Dopping effect by radio waves.

FIG. 3 is a block diagram showing an internal configuration of the movable body detection device according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a main part of an internal configuration of a movable body detection device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a main part of an internal configuration of a movable body detection device according to a third embodiment of the present invention.

FIG. 6 is a waveform diagram of a transmission signal according to a first modification of the third embodiment shown in FIG. 5;

FIG. 7 is a front view of a movable body detection device main body according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along line AA ′ of the apparatus main body shown in FIG. 7;

FIG. 9 is a perspective view of the toilet apparatus with the hot water flush toilet seat in which the movable body detection device shown in FIGS. 7 and 8 is installed, as viewed from the front.

FIG. 10 is a side view of the toilet device shown in FIG. 9;

11 is a plan view of the toilet device shown in FIG.

FIG. 12 is an arrangement pattern of a male urinal in which a plurality of movable urinal detection devices using a received transmission signal as a reference signal can be installed in each of a plurality of juvenile urinals without interference between the devices. FIG.

FIG. 13 shows a male urinal arrangement pattern in which a plurality of movable urinal detection devices using a received transmission signal as a reference signal can be installed in each of a plurality of juvenile urinals without interference between the devices. Explanatory drawing which shows another example of.

FIG. 14 is a layout diagram of a male urinal in which a plurality of movable urine detecting devices using a received transmission signal as a reference signal can be installed in each of a plurality of juxtaposed male urinals without interference between the devices. Explanatory drawing which shows another example of FIG.

FIG. 15 is a diagram showing an output waveform from a movable body detection device according to a fifth embodiment of the present invention.

FIG. 16 is a block diagram showing a main part of an internal configuration of a movable body detection device according to a sixth embodiment of the present invention.

FIG. 17 is a block diagram showing a main part of an internal configuration of a movable body detection device according to a seventh embodiment of the present invention.

FIG. 18 is a signal spectrum of a transmission signal and a timing chart of the transmission signal according to a seventh embodiment of the present invention.

FIG. 19 is a block diagram showing a main part of an internal configuration of a movable body detection device according to a modification of the seventh embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 21 transmission circuit 23 reception circuit 25 conversion circuit 27 signal processing circuit 29 movable body (human body) 31 adjustment circuit 331 to 338, 35, 41 switch 37 transmission antenna 39 reception antenna 43 control circuit 45 device body 47 sensor substrate 49 cover member 51 window 53, 63a to 63h Radiation range of radio wave 55 Toilet device with warm water flush toilet seat 57 Toilet seat 61a to 61h Men's urinal 65 Screen 67 Waveform determination circuit 69 Primary modulation circuit 71 Carrier generation unit 73 Secondary modulation circuit 75 Diffusion signal generation unit 77 Exclusive OR circuit

Continued on the front page (72) Inventor Koji Mine 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-city, Fukuoka Prefecture F-term (reference) 2D037 BA00 EB00 2D039 AA04 FA06 2G005 DA04 5J070 AB07 AB15 AB16 AB17 AC02 AC06 AD02 AE09 AF01 AH14 AH23 AK13 AK28 BA01

Claims (14)

[Claims] 1. A means for externally generating a signal to be transmitted as a radio wave, a means for receiving a signal transmitted as a radio wave from outside, reading the received signal, and receiving the transmitted signal A movable body detection device comprising: a signal generation unit that obtains a difference from a frequency of a signal, and directly reads from the transmission signal generation unit as a reference signal necessary to generate a signal corresponding to the difference. 2. A means for generating a signal to be transmitted as a radio wave to the outside, a means for receiving a signal transmitted as a radio wave from the outside, and the receiving means, together with a signal transmitted from the outside as a radio wave. A signal generation unit that calculates the difference between the received transmission signal and the frequency of the reception signal, and reads the signal together with the reception signal as a reference signal necessary to generate a signal corresponding to the difference; Means for variably adjusting the frequency of the transmission signal generated by the signal generation means. 3. The movable body detection device according to claim 2, wherein the frequency to be variably adjusted is a plurality of predetermined frequencies. 4. The movable body detection device according to claim 2, wherein the variably adjusted frequency is a plurality of frequencies having arbitrarily different values. 5. The movable body detection device according to claim 2, wherein the frequency of the transmission signal is variably adjusted by a command signal from a remote controller. 6. A means for generating a signal to be transmitted as a radio wave to the outside, a means for receiving a signal transmitted as a radio wave from the outside, and the receiving means, together with the signal transmitted from the outside as a radio wave. A signal generation unit that calculates the difference between the received transmission signal and the frequency of the reception signal and reads the signal together with the reception signal as a reference signal necessary to generate a signal corresponding to the difference; And a means for controlling the generation means, and prohibiting reception of the signal by the reception means when the transmission signal generation means does not generate the transmission signal. 7. The movable body detection device according to claim 6, wherein a transmission signal radiated as radio waves to the outside is intermittently radiated. 8. The movable body detection device according to claim 7, wherein a radiation time interval of the transmission signal can be set to an arbitrary time interval. 9. The movable body detection device according to claim 8, wherein the emission time interval of the transmission signal is variably adjusted by a command signal from a remote controller. 10. A means for generating a signal to be transmitted as a radio wave to the outside, a means for receiving a signal transmitted from the outside as a radio wave, and the receiving means, together with the signal transmitted from the outside as a radio wave. A signal generating means for reading the received transmission signal, obtaining a difference from the frequency of the reception signal, and reading the received transmission signal together with the reception signal as a reference signal required to generate a signal corresponding to the difference, Means for limiting a radiation space area of a transmission signal radiated as a radio wave and a reception space area of a radio wave transmitted from the outside. 11. An external means for generating a signal to be transmitted as a radio wave, a means for receiving a signal transmitted as a radio wave from the outside, and the receiving means, together with the signal transmitted from the outside as a radio wave. Signal generation means for obtaining the difference between the received transmission signal and the frequency of the reception signal, and reading the received transmission signal together with the reception signal as a reference signal necessary for generating a signal corresponding to the difference; Means for determining that reading of the received signal by the signal generation means is effective only when the amount of change in the received signal transmitted as (a) exceeds a predetermined threshold value. 12. A means for generating a signal to be transmitted as a radio wave to the outside, a means for receiving a signal transmitted as a radio wave from the outside, and the receiving means, together with the signal transmitted from the outside as a radio wave. A signal generation unit that obtains a difference between the received transmission signal and a frequency of the reception signal, and reads the received transmission signal together with the reception signal as a reference signal necessary for generating a signal corresponding to the difference; Means for reading only the reception signal having the same continuous waveform as the transmission signal, among the reading of the reception signal by the means, which is regarded as valid. 13. A toilet apparatus in which a plurality of movable body detection devices using radio waves are arranged so as not to cause mutual interference. 14. In a toilet room in which a plurality of toilet devices are arranged side by side, each toilet device can prevent interference between movable body detection devices using radio waves, which are installed for each toilet device. Toilet room located.