JPH11271444A - Human body detecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a human body detecting apparatus by which a human body can be detected precisely. SOLUTION: A human body detecting apparatus is provided with a heat ray detection sensor part B which outputs a movement detecting signal on the basis of the change in heat rays within a first detecting region R, which an ultrasonic detection sensor part A which transmits ultrasonic waves to a second detecting region S contained in the first detecting region R and which outputs an existence detecting signal when a received waveform pattern is different from a waveform pattern received immediately after the movement detecting signal is output and with a comprehensive judgment part C which outputs a human body absence detecting signal when the movement detecting signal and the existence detecting signal are not output. In the human body detecting apparatus, the waveform pattern of ultrasonic waves received last time is compared with the waveform pattern of ultrasonic waves received this time, and the human body absence detecting signal is output in a point of time in which the human body detecting signal is not output any more when the movement detecting signal is output in a second prescribed time measured so as to be overlapped with a first prescribed time in which a measurement is started when the waveform pattern is changed by a predetermined value or higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detection sensor, and more particularly, to a human body detection sensor for detecting a temperature difference between a human body and a background, which detects the movement of the human body and uses ultrasonic waves. The present invention relates to a human body detection device that comprehensively detects a human body by detecting the presence of an object or a human body in a monitoring space using an ultrasonic detection sensor.

[0002]

2. Description of the Related Art A conventional human body detecting device will be described with reference to FIGS. FIG. 4 is a block diagram illustrating a configuration of a conventional human body detection device. 5A and 5B are timing charts showing the operation of the conventional human body detection device, in which FIG. 5A shows the operation of the human body at that time, FIG. 5B shows the movement detection signal, and FIG. 5C shows the presence detection signal. , (D) shows the presence change signal, (d) shows the environment update flag signal, and (e)
Indicates an off-delay time measurement start signal, and (f) indicates a load output. FIG. 6 is a timing chart showing the operation of another conventional human body detection device, in which (a) shows the operation of the human body at that time, (b) shows a movement detection signal,
(C) shows a presence detection signal, (d) shows a presence change signal, (d) shows an environment update flag signal, (e) shows a measurement start signal of an off-delay time, and (f) shows a load. Show output. 7A and 7B are timing charts showing the operation of another conventional human body detection device, in which FIG. 7A shows the operation of the human body at that time, FIG. 7B shows a movement detection signal, and FIG. And (d) shows the presence fluctuation signal,
(D) shows the environment update flag signal, (e) shows the off-delay time measurement start signal, and (f) shows the load output. Note that the environment update flag is turned on when the load output is off or when it is determined that the load output may be turned off. The environment data described later is updated.

[0003] The ultrasonic detection sensor section A transmits an ultrasonic wave of a predetermined frequency into an existence detection area S corresponding to a second detection area by using an ultrasonic vibrator. The ultrasonic wave vibrator receives a reflected wave from an object located in the above, and detects the presence of the object. When the transmitted ultrasonic wave is reflected by an object that has entered the presence detection area S, the presence detection area S refers to a space in which the reflected wave can be received. This is a space where intruders can be detected.

The hot-wire detection sensor section B uses a pyroelectric element capable of detecting a temperature change caused by heat radiated by the human body H in a movement detection area R corresponding to a first detection area. Thus, the movement of the human body H is detected.
The movement detection region R is a space that includes the presence detection region S and is wider than the presence detection region S, and is a space in which the movement of the human body H can be detected by the hot-wire detection sensor unit B.

[0005] As shown in FIG. 4, the conventional human body detection device includes an ultrasonic detection sensor unit A and a hot-wire detection sensor unit B.
And a comprehensive judgment section C. Ultrasonic detection sensor A
Is an oscillator 10, a transmission circuit 11, and a transmission interval determiner 1.
2, an ultrasonic transmitter / receiver 13 having both an ultrasonic transmitter and an ultrasonic receiver, an amplification circuit 14, a detection circuit 15,
Ultrasonic environment data storage unit 16, current ultrasonic data storage unit 17, previous ultrasonic data storage unit 18, ultrasonic presence detection circuit 19, ultrasonic movement detection circuit 20, and ultrasonic movement time measurement circuit 28. Hot wire detection sensor B
Is a condenser 41, a pyroelectric element 42, an amplifier circuit 43,
And a heat ray judging circuit 44. The comprehensive judgment section C includes a detection judgment circuit 55, a delay circuit 56, and a light reduction circuit 57.

In the ultrasonic detection sensor section A, the oscillation signal output from the oscillator 10 becomes a tone burst wave in the transmission circuit 11 and is transmitted and received at the transmission interval determined by the transmission interval determiner 12. It is transmitted as ultrasonic waves from the device 13. The transmitted ultrasonic wave is reflected by an object in the presence detection area S, and is reflected as an ultrasonic wave by the ultrasonic transducer 1.
3 is received. The received ultrasonic wave is amplified by the amplifier circuit 1
After being amplified by 4, it is detected by the detection circuit 15. The detection signal detected by the detection circuit 15 is input to the ultrasonic current data storage unit 17.

[0007] The ultrasonic environment data storage unit 16, the current ultrasonic data storage unit 17, and the previous ultrasonic data storage unit 18
The detection signal detected by the detection circuit 15 is recorded as a time-series waveform pattern. Ultrasound environment data storage unit 1
Reference numeral 6 stores environmental data, which is a waveform pattern of an ultrasonic wave immediately before the movement detection signal is output from the heat ray determination circuit 44. Further, the ultrasonic current data storage unit 17 stores the current data, which is the most recently received waveform pattern.
Then, the ultrasonic wave presence detection circuit 19 determines the presence / absence of the human body H by recognizing that the current data has changed with respect to the environment data, and outputs a presence detection signal.

Furthermore, the current data stored in the ultrasonic current data storage unit 17 is updated as appropriate.
The current data stored in the current ultrasonic data storage unit 17 before the new update is stored in the previous ultrasonic data storage unit 18 as the previous data. Then, the ultrasonic movement detection circuit 20 determines the movement of the human body H by recognizing that the current data has changed from the previous data. In the ultrasonic moving time measuring circuit 28, the ultrasonic moving time measuring circuit 28 measures the time since the movement of the human body H is stopped (the previous data and the current data match), and the previous data and the current data are measured for a predetermined time or more. Outputs an ultrasonic movement stop signal when the values match.

In the hot-wire detection sensor section B, the light collector 4
Reference numeral 1 includes a lens or a reflector, and collects heat rays radiated from an object such as a human body. The collected heat rays are detected by the pyroelectric element 42 as a temperature change.
The output current of the pyroelectric element 42 that changes according to the temperature change is:
The voltage is converted to a voltage and output from the pyroelectric element 42. The amplification circuit 43 amplifies the output of the pyroelectric element 42 and
Enter 4 If the input voltage is larger than the threshold voltage, the hot-wire determination circuit 44 determines that the human body H has moved in the movement detection region R and outputs a movement detection signal.

In the overall judgment section C, a detection judgment circuit 55
Monitors the presence / absence of the presence detection signal output from the ultrasonic presence detection circuit 19 and the presence / absence of the movement detection signal output from the hot-wire determination circuit 44 to comprehensively determine the presence or absence of the human body H. That is, a human body detection signal is output immediately when either signal is output, and when neither signal is output, the delay circuit 56 outputs a human body non-detection signal after a predetermined off-delay time has elapsed. Further, even if the presence detection signal is output from the ultrasonic presence detection circuit 19, when the ultrasonic movement stop signal is output from the ultrasonic movement time measurement circuit 28, the movement detection signal output from the hot wire determination circuit 44 When no is output, a no-body detection signal is output after the off-delay time has elapsed.

The on / off control of the external load can be performed using the human body detection signal and the human body non-detection signal output by the human body detection device. For example, in the case of toilet lighting, the human body H is illuminated simultaneously with entering the toilet. Is turned on, and the light is turned off shortly after leaving the room. Note that the human body detection device described here has a dimming circuit 57 in the comprehensive judgment unit C, and the lighting connected as a load is dimmed and turned off for a certain period of time after a human body non-detection signal is output. I am trying to do it.

When the human body H enters the presence detection area S with the luggage L and exits with the luggage L, the presence detection signal continues to be output because the current data and the environmental data do not match. If the previous data and the current data match for a predetermined time and the movement detection signal is output from the hot-wire determination circuit 44 during that time, measurement of the off-delay time starts when the movement detection signal is no longer output from the hot-wire determination circuit 44. Then, when the off-delay time has elapsed, a human body non-detection signal is output.

[0013]

However, in the human body detecting device having the above configuration, the ultrasonic wave stop signal is output after a predetermined time has elapsed since the previous data and the current data coincided. However, as shown in FIG. 5, if this time is set long (here, 4 seconds), the movement detection signal is not output from the hot-wire determination circuit 44 until the ultrasonic movement stop signal is output. There is a problem that the measurement of the delay time is not started and the illumination corresponding to the load is not turned off even after the human body H leaves the detection area. Further, if the time is set short (here, one second) as shown in FIG. 6, the above-mentioned problem is solved, but as shown in FIG.
When reading a book, the movement due to ultrasonic waves is not detected, but the movement detection signal is output due to slight movement such as turning a page of the book.If the movement detection signal is not output, the illumination decreases after the elapse of the off-delay time. There was a problem of being illuminated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a human body detection device capable of accurately detecting a human body.

[0015]

According to the first aspect of the present invention,
A hot-wire detection sensor unit that detects a change amount of a heat ray in the first detection area, determines that the human body has moved when the detected change amount is larger than a predetermined threshold, and outputs a movement detection signal; Transmitting an ultrasonic wave to the second detection area included in the first detection area, and receiving the waveform pattern of the received ultrasonic wave and the waveform of the ultrasonic wave immediately before the movement detection signal is output from the hot-wire determination unit An ultrasonic detection sensor unit comprising an ultrasonic judgment unit for comparing the environment data as a pattern and outputting a presence detection signal assuming that an object is present in the second detection area if different, and a movement detection signal Or, when either of the presence detection signals is output, it is determined that a human body is present and a human body detection signal is output, and when neither is output, it is determined that the human body is not present and the human body no detection signal is output. Comprehensive judgment to output In the human body sensing device including bets,
A predetermined time at which the measurement is started after the waveform pattern of the ultrasonic wave received at the time of the previous transmission and the ultrasonic wave pattern received at the time of the current transmission change by a predetermined amount or more is defined as a first time.
If the movement detection signal is output for a second predetermined time that is measured during the measurement of the first predetermined time, the movement detection signal is output even if the presence detection signal is output. Is output when the signal is no longer output.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the human body detection device. FIG. 2 is a timing chart showing the operation of the human body detection device, showing a state where the human body enters a toilet having an inward opening door and leaves the room with the toilet seat open, and (a) shows the operation of the human body at that time. (B) shows a movement detection signal, (c) shows a presence detection signal, (d) shows a presence change signal, and (d)
Indicates an environment update flag signal, (e) indicates a measurement start signal of an off-delay time, and (f) indicates a load output. FIG. 3 is a timing chart showing the operation of another human body detection device, showing how the human body reads in the presence detection area, where (a) shows the operation of the human body at that time, and (b)
Indicates a movement detection signal, (c) indicates a presence detection signal,
(D) shows the presence fluctuation signal, (d) shows the environment update flag signal, (e) shows the off-delay time measurement start signal, and (f) shows the load output. The same parts as those of the human body detection device described in the related art are denoted by the same reference numerals, and detailed description of the same parts will be omitted.

This human body detection device is mounted on a ceiling of a toilet or the like, and controls the lighting and extinction of lighting equipment (not shown) in the toilet by accurately detecting a human body in a detection area. .

In FIG. 1, the human body detecting device comprises an ultrasonic detecting sensor unit A, a hot-wire detecting sensor unit B, and a comprehensive judging unit C. The ultrasonic detection sensor unit A includes an oscillator 10
, A transmission circuit 11, a transmission interval determiner 12, an ultrasonic transmitter / receiver 13 having both an ultrasonic transmitter and an ultrasonic receiver
, An amplification circuit 14, a detection circuit 15, an ultrasonic environment data storage section 16, an ultrasonic current data storage section 17, an ultrasonic previous data storage section 18, and an ultrasonic presence detection circuit 19
, An ultrasonic movement detecting circuit 20 and an ultrasonic moving time measuring circuit 28. The hot-wire detection sensor unit B is
1, a pyroelectric element 42, an amplifying circuit 43, a hot-wire determining circuit 44, and a hot-wire moving time measuring circuit 45. The comprehensive judgment section C includes a detection judgment circuit 55, a delay circuit 56, and a light reduction circuit 57.

In the hot-wire detection sensor section B, the condenser 4
The heat ray incident through 1 is detected as a voltage change by the pyroelectric element 42, amplified, and input to the heat ray determination circuit 44. If the input voltage is larger than the threshold voltage, the hot-wire determination circuit 44 determines that the human body H has moved in the movement detection region R and outputs a movement detection signal. At that time, the heat ray movement time measurement circuit 45 measures the time during which the movement detection signal is output.

In the comprehensive judgment section C, the detection judgment circuit 55
Monitors the presence / absence of the presence detection signal output from the ultrasonic presence detection circuit 19 and the presence / absence of the movement detection signal output from the hot-wire determination circuit 44 to comprehensively determine the presence or absence of the human body H. That is, a human body detection signal is output immediately when either signal is output, and when neither signal is output, the delay circuit 56 outputs a human body non-detection signal after a predetermined off-delay time has elapsed.

Even if the presence detection signal is output from the ultrasonic presence detection circuit 19, when the ultrasonic movement stop signal is output from the ultrasonic movement time measurement circuit 28, it is output from the hot-wire determination circuit 44. When the movement detection signal is no longer output, a human body non-detection signal is output after the elapse of the off-delay time. At this time, if the time t2 at which it is determined that there is no ultrasonic movement has elapsed while the movement detection signal of the hot-wire determination circuit 44 has been output for the predetermined time t1 or more, the switch is turned off when the movement detection signal is stopped. The measurement of the delay time is started, and the environment update flag is turned on. Then, the human body non-detection signal is output after the predetermined off-delay time has elapsed. Note that t
It is assumed that 1> t2, and the ultrasonic wave movement stop signal is generated while the human body non-detection signal is being output.

According to the present embodiment, as shown in FIG. 2, the human body H is turned off after leaving the room, and as shown in FIG. If a hot-wire signal is output without a delay, the light will not be dimmed even if the apparatus is stationary for the off-delay time.

[0023]

As described above, according to the first aspect of the present invention, the amount of change in the heat ray in the first detection area is detected, and when the detected amount of change is larger than a predetermined threshold value. A hot-wire detection sensor unit that determines that a human body has moved and outputs a movement detection signal, and transmits an ultrasonic wave to a second detection area included in the first detection area, and receives the received ultrasonic wave. Is compared with the environmental data which is the waveform pattern of the ultrasonic wave immediately before the movement detection signal is output from the heat ray determination unit, and if they are different, it is determined that the object is present in the second detection area. An ultrasonic detection sensor unit including an ultrasonic determination unit that outputs a, and if either the movement detection signal or the presence detection signal is output, it is determined that a human body is present, and a human body detection signal is output. If neither is output In a human body detection device including a comprehensive determination unit that determines that a body does not exist and outputs a human body non-detection signal, a waveform pattern of an ultrasonic wave received during a previous transmission and an ultrasonic wave received during a current transmission. A predetermined time at which measurement is started after the waveform pattern of the sound wave has changed by a predetermined amount or more is defined as a first predetermined time, and a second predetermined time is measured while the first predetermined time is being measured. If the movement detection signal has been output for a while, even if the presence detection signal has been output, the human body no-detection signal is output when the movement detection signal is no longer output. Provided is a human body detection device that can accurately detect a human body because it can distinguish whether the detection is due to a human body or an object brought in by the human body when detected. There is an effect that it is Rukoto.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a human body detection device.

FIG. 2 is a timing chart showing the operation of the human body detection device, showing a state in which the human body enters a toilet having an inward opening door and leaves the room with the toilet seat open, and (a) shows the human body at that time. (B) shows a movement detection signal, (c) shows a presence detection signal, (d) shows a presence change signal, (d) shows an environment update flag signal, and (e)
Indicates an off-delay time measurement start signal, and (f) indicates a load output.

FIG. 3 is a timing chart showing the operation of another human body detection device, showing how the human body reads in the presence detection area; FIG. 3 (a) shows the operation of the human body at that time;
(B) shows a movement detection signal, (c) shows a presence detection signal, (d) shows a presence change signal, (d) shows an environment update flag signal, and (e) shows measurement of an off-delay time. A start signal is shown, and (f) shows a load output.

FIG. 4 is a block diagram illustrating a configuration of a conventional human body detection device.

5A and 5B are timing charts showing the operation of the conventional human body detection device, in which FIG. 5A shows the operation of the human body at that time, FIG. 5B shows a movement detection signal, and FIG. (D) shows the presence fluctuation signal, (d) shows the environment update flag signal, (e) shows the off-delay time measurement start signal, and (f) shows the load output.

6A and 6B are timing charts showing the operation of another conventional human body detection device, in which FIG. 6A shows the operation of the human body at that time, FIG. 6B shows a movement detection signal, and FIG. (D) shows the presence variation signal, (d) shows the environment update flag signal, (e) shows the off-delay time measurement start signal, and (f) shows the load output.

7A and 7B are timing charts showing the operation of another conventional human body detection device, where FIG. 7A shows the operation of the human body at that time, FIG. 7B shows a movement detection signal, and FIG. (D) shows the presence variation signal, (d) shows the environment update flag signal, (e) shows the off-delay time measurement start signal, and (f) shows the load output.

[Explanation of symbols]

 A Ultrasonic detection sensor section B Hot-wire detection sensor section C Comprehensive judgment section H Human body R Movement detection area (first detection area) S Presence detection area (second detection area) 10 Transmitter 11 Transmission circuit 12 Transmission Wave interval determiner 13 Ultrasonic wave transmitter / receiver 14 Amplifier circuit 15 Detection circuit 16 Ultrasonic environment data storage unit 17 Ultrasonic current data storage unit 18 Ultrasonic previous data storage unit 19 Ultrasonic presence detection circuit 20 Ultrasonic movement detection circuit 28 Ultrasonic moving time measuring circuit 41 Condenser 42 Pyroelectric element 43 Amplifying circuit 44 Hot wire determining circuit 45 Hot wire moving time measuring circuit 55 Detection determining circuit 56 Delay circuit 57 Light dimming circuit

Claims (1)

[Claims] 1. A hot wire for detecting a change amount of a heat ray in a first detection area, determining that a human body has moved when the detected change amount is larger than a predetermined threshold, and outputting a movement detection signal. An ultrasonic sensor is transmitted to the second detection region included in the first detection region, and a waveform pattern of the received ultrasonic wave and immediately before the movement detection signal is output from the heat ray determination unit. An ultrasonic detection sensor unit comprising: an ultrasonic wave determination unit that compares the environmental data, which is a waveform pattern of the ultrasonic wave, and outputs a presence detection signal assuming that an object is present in the second detection area if they are different. If either the movement detection signal or the presence detection signal is output, it is determined that a human body is present, and a human body detection signal is output.If neither is output, it is determined that the human body is not present. Outputs no human body detection signal In the human body detection device provided with a comprehensive judgment unit, the waveform pattern of the ultrasonic wave received at the time of the previous transmission and the waveform pattern of the ultrasonic wave received at the time of the current transmission changed more than a predetermined value. The predetermined time when the measurement is started later is the first
If the movement detection signal is output for a second predetermined time that is measured during the measurement of the first predetermined time, the movement detection signal is output even if the presence detection signal is output. A human body non-detection signal is output when the output of the human body is stopped.