JP2002148354A - Human body detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve detecting accuracy by correcting the background temperature by a monitoring sensor without an independent background temperature measuring area for correcting in a human body detector used in monitoring the interior of a toilet of a hospital or a home for the aged. SOLUTION: Plural infrared ray detecting sensors are disposed to divide a monitoring area and monitor the same, and according to the change of output of the sensor not detecting the human body, entering/leaving determination is corrected to obtain high detecting accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detecting device for detecting heat generated by a human body. In addition, preferably, the presence of a human body in a private room toilet or the like of a hospital or a geriatric facility,
The present invention relates to a human body detection device capable of detecting position information, staying for a long time, and the like with high accuracy, and transmitting information such as an alarm and information in a toilet.

[0002]

2. Description of the Related Art Conventionally, various types of human body detecting devices for detecting the presence of a human body in a toilet have been used.

[0003] A conventional human body detecting device which detects the presence of a human body in a toilet using a pyroelectric infrared sensor to generate an alarm at the time of abnormality and to control devices such as lighting and a ventilation fan in the toilet will be described. This will be described with reference to the drawings.

FIG. 9 is a layout diagram showing the layout of a conventional human body detection device. In the figure, 28 is a toilet door, 29 is a light in the toilet, 30 is a ventilation fan in the toilet, 31 is a toilet in the toilet, 32 is a ceiling installed in front of the toilet door 28, and a light 29 and a ventilation fan 30 are provided. The connected human body detection device, 32 is a pyroelectric infrared sensor built in the human body detection device 31, and 33 is a monitoring area of the pyroelectric infrared sensor 32.

The operation of detecting a human body in a toilet in the conventional human body detecting device 31 configured as described above will be described.

When the human body approaches the toilet door 28 and the human body reaches the monitoring area 28 by the pyroelectric infrared sensor 32,
Pyroelectric infrared sensor 32 built in human body detecting device 31
Detects the movement of the human body as a heat change and generates a voltage,
The output of the generated voltage is electrically processed in the human body detection device 31 to turn on the illumination 29 and rotate the ventilation fan 30. After the elapse of the time set in advance by the timer, the light 29 is turned off and the rotation of the ventilation fan 30 is stopped. However, in this configuration, since a stationary human body cannot be continuously detected, there is a problem that depending on the setting of the timer, the lighting may be turned off even if there is a person, or the lighting may be continued more than necessary without the presence of a person. I was

In order to solve this problem, a method is used in which a chopper is provided in the light receiving portion of the pyroelectric infrared sensor 32 to modulate incident light to continuously detect a human body. Hereinafter, the signal processing of this method will be described with reference to FIG. The infrared light modulated by the chopper 33 forms an image on the pyroelectric infrared sensors 35a, 35b, and 35c by the lens.
35a, 35b, and 35c are divided for each monitoring area. The outputs of the pyroelectric infrared sensors 35a, 35b, 35c are amplified by amplifiers 36c, 36b, 36c, respectively. Reference numerals 37a, 37b, and 37c denote low-pass filters that pass only low-frequency components of the amplified sensor output. When the detection area is unmanned, the pyroelectric infrared sensor 35
a, 35b, and 35c output the difference between the monitoring area background temperature and the chopper temperature, and when a human body enters the detection area,
The difference between the monitoring area background temperature and the temperature of the human body is output as a sudden change. Low-pass filters 37a, 37b, 37c
Is set sufficiently lower than the frequency corresponding to this sudden change, a difference occurs between the sensor output and the low-pass filter output. A predetermined threshold value is added to the low-pass filter by the adders 38a, 38b, 38c in consideration of variations in the background temperature and other thermal disturbances, and the outputs of the pyroelectric infrared sensors 35a, 35b, 35c are in the low band. If the difference from the output of the pass filters 37a, 37b, 37c exceeds the threshold value, the comparators 39a, 39b, 39c
Output "1", and intrusion is detected. CPU40
Controls the operation of the low-pass filter in the monitoring area where the intrusion has occurred, and holds the output when the intrusion occurs. Therefore, the comparator keeps outputting “1” while the human body exists in the detection area. When the human body exits from the monitoring area, the output of the pyroelectric infrared sensor returns to the monitoring area background temperature and becomes equal to or lower than the threshold, so that the comparator output becomes “0”. The CPU 40 receives this and restarts the operation of the low-pass filter. With this configuration, it is possible to continuously detect the human body.

However, in the above configuration, if an environmental change occurs in which the difference between the chopper and the background temperature of the monitoring area becomes equal to or greater than the threshold value before the detection of the exit, the output of the comparator is maintained even after the exit of the human body. There is a new problem that 1 "is continuously output.

Japanese Patent Laid-Open Publication No. Hei.
A correction method disclosed in US Pat. No. 1,876,91 has been devised. It has a human body detection sensor and a reference detection sensor independently, and has processing means for processing a detection signal of the human body detection sensor based on the background temperature detected by the reference detection sensor.

[0010]

However, in a human body detecting device for a toilet such as a hospital or a nursing home, it is necessary to cover the entire area in the toilet, and providing a sensor monitoring area only for correction is a safety problem. It is. In addition, using the sensor only for correction is redundant. Furthermore, since the indoor shape of the toilet varies widely, there is a problem that the sensor monitoring area for correction needs to be changed according to the shape of the toilet.

SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and to realize a human body detecting device capable of detecting a change in background temperature of a monitoring area without having a monitoring area exclusively for correction and capable of detecting with high accuracy.

[0012]

In order to solve these problems, according to the present invention, a monitoring area is divided and monitored by a plurality of sensors, and the background temperature of the monitoring area where a human body has entered is detected. The correction is performed based on the sensor output of the monitoring area that has not been monitored.

As a result, it is possible to realize a high-precision human body detection device that prevents erroneous detection of a human body due to a change in background temperature.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An invention according to claim 1 of the present invention is arranged so that a monitoring area is divided and monitored, a plurality of infrared sensors for detecting heat of a human body, and a change in the output of the infrared sensor. Based on intrusion / exit detection means for detecting intrusion and exit of the human body to the monitoring area based on the change in the output of the infrared sensor which does not detect the human body, and correction means for correcting the exit detection. By using the infrared sensor that does not detect a human body among the sensors for monitoring intrusion and egress to use for the background temperature correction of the infrared sensor that detects a human body, it becomes independent. This has the effect of eliminating the need for a reference value sensor.

According to a second aspect of the present invention, in the body detecting apparatus according to the first aspect, there is provided a selecting means for designating and selecting one from a plurality of signals as the correcting means, and the installation environment or the infrared sensor. It is characterized by using a correction means for selecting and correcting the output of the infrared sensor according to the arrangement of the infrared sensor, the selection means according to the installation environment or the arrangement of the infrared sensor, a plurality of human bodies as appropriate By selecting an optimal sensor for the background temperature correction from among the infrared sensors that have not been detected, an effect of enabling a highly accurate correction can be obtained.

According to a third aspect of the present invention, a plurality of infrared sensors for detecting the heat of a human body are disposed so as to divide and monitor the inside of a toilet, and to a monitoring area based on a change in sensor output. Intrusion / exit detection means for performing intrusion detection and exit detection of the human body, and correction means for correcting the exit detection based on a change in the output of the infrared sensor that does not detect the human body, At least one of the infrared sensors has a monitoring area A that does not detect the human body in a state of sitting on a toilet seat, and the human body sitting on the toilet seat based on the output of the infrared sensor in which the correction unit monitors the monitoring area A. Wherein the detection of the exit from the monitoring area B for detecting the exit is corrected, and the monitoring area B in which the background temperature is most likely to change in the toilet is provided.
The infrared sensor, which can obtain an output closer to the background temperature without being directly affected by the heat generated by the human body when staying at the camera for a long time, can be used for background temperature correction.

According to a fourth aspect of the present invention, in the human body detecting apparatus according to the third aspect, there is provided a selecting means for designating and selecting one from a plurality of signals as a correcting means. It is characterized by using a correction means for selecting and correcting the infrared sensor output according to the arrangement of the infrared sensor, the selection means according to the installation environment or the arrangement of the infrared sensor, a plurality of the By selecting an optimal sensor for background temperature correction from among the infrared sensors that monitor the monitoring area A, it is possible to perform highly accurate correction.

According to a fifth aspect of the present invention, in the first, second, third and fourth aspects of the present invention, the plurality of infrared sensors are pyroelectric infrared sensors. By using a pyroelectric infrared sensor that can be controlled by a simple circuit and can be miniaturized by integrating the plurality of infrared sensors into one element, a light and small human body can be obtained. This has the effect that the detection device can be realized.

An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram showing a human body detecting apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a sensor capable of detecting heat. As the sensor 1, an infrared sensor is preferably used. As the infrared sensor, for example, a semiconductor infrared sensor, a light reflection infrared sensor, a thermoelectromotive infrared sensor, a pyroelectric infrared sensor, or the like can be used.
In particular, it is preferable to use a pyroelectric infrared sensor as the sensor 1 in consideration of low cost, wide range detection, ease of setting a complicated detection range, and the like. Hereinafter, in the present embodiment, the sensor 1 uses a pyroelectric infrared sensor.

The configuration when a pyroelectric infrared sensor is used as the sensor 1 will be described in detail.

Basically, the sensor 1 includes a light receiving element 1e, a light collecting section 1d for collecting and guiding infrared light and the like to the light receiving element 1e, and a chopper 7. In addition,
In order to improve the attachment to the device, the light receiving element 1
e, the light collecting section 1d, and the chopper 7 are preferably provided in one package. Three light receiving elements 1a to 1c are provided in the light receiving element 1e. Since the light receiving elements receive infrared rays from independent monitoring areas, they are functionally equivalent to three independent infrared sensors. Specifically, as shown in FIGS. 9 and 10, a plurality of input / output pins 1g are provided through the hermetic base 1f, and the hermetic base 1 is provided with a metal cover 1h. In the metal cover 1h, the light receiving element 1a
To 1c, and a printed circuit board 1k on which a circuit 1j for amplifying a signal from the pyroelectric element 1i is housed, and the printed circuit board 1k has input / output pins 1g. Are electrically connected.

The pyroelectric element 1 in the metal cover 1h
An opening is provided at a portion facing i, and a sealing member (silicon plate or the like) 11 that allows infrared rays to pass from the inside of the metal cover 1h is provided so as to cover the opening. In the present embodiment, the light receiving elements 1a, 1
b, 1c, but in consideration of miniaturization and low cost of the light receiving element 1e, 3 to 12 (preferably 3
To 8).

It is preferable that the condensing portion 1d is made of a material that can transmit infrared rays and has a condensing property. For example, an infrared lens (such as a convex lens) made of single-crystal silicon or a hologram formed on a substrate that can transmit infrared light is preferably used. In particular, the former infrared lens is excellent in cost, characteristics, etc.
It is preferably used, and it is very effective to set the focal length to 2 to 6 mm at this time in terms of miniaturization and characteristics of the apparatus.

The chopper 7 is arranged on the entire surface of the light condensing section 1d, and modulates the infrared light incident on the light receiving element 1e by being driven to rotate. The shape of the chopper 7 is preferably formed in a disk shape and has a symmetrical shape, so that the vibration accompanying the rotation of the chopper 7 can be reduced. In the present embodiment, the fan-shaped slit 7a provided in the disc-shaped body at an angle of about 90 degrees is provided symmetrically about the center axis. The number of slits 7a may be three or more as long as it has symmetry. Preferably, the chopper 7 controls the infrared light incident on the light receiving element 1e so that the infrared light is input at a frequency of 10 to 30 Hz, so that reliable detection accuracy can be obtained.

Reference numerals 2a, 2b and 2c denote amplifier circuits for amplifying three outputs from the light receiving elements 1a to 1c in the sensor 1, respectively. In this embodiment, an operational amplifier IC and passive components such as resistors and capacitors are used. Constructed in a known manner. As described above, when two or four or more light receiving elements are provided, an amplifier circuit is required for at least only the light receiving elements. Thus, by providing the amplifier circuits 2a to 2c, the output from the sensor 1 can be increased, and the detection accuracy can be improved by widening the dynamic range. In addition, in the amplifier circuit 1j provided in the sensor 1,
If a sufficiently large output can be output, this amplifier circuit 2
a to 2c become unnecessary.

Reference numerals 3a, 3b, and 3c denote analog-digital conversion circuits (hereinafter, referred to as A / D conversion circuits), which convert the output of the amplifier circuit into a digital value.

Reference numeral 4 denotes an intrusion detector for detecting the intrusion and egress of a human body into the monitored area of each of the elements 1a, 1b and 1c.
It is a leaving detection means. Reference numeral 5 denotes a correction unit that corrects the exit detection of the intrusion / exit detection unit 4. Reference numeral 6 denotes control means for controlling the whole, such as a CPU (central processing unit). 8a is a memory circuit for storing a program for operating the present apparatus and temporary data for calculation. 8b is a memory circuit for storing initial setting values and the like. The memory circuit 8b stores various parameters for performing human body detection (thresholds for human body detection, timer values used for control, and the like). In the present embodiment, the memory circuit 8b for storing the various parameters described above is provided as a semiconductor device separately from the control means 6, so that the semiconductor device can be replaced or a predetermined condition such as an EP-ROM can be satisfied. By making the internal memory rewritable, it is possible to easily change the parameters of human body detection according to the installation location, etc. Can be improved.

Reference numeral 9 denotes a driving means for rotating the chopper 7. As the driving means 9, a motor is preferably used.
As the motor, a DC motor, an AC motor, a servo motor, or the like is preferably used. In particular, a DC power supply is used as a power supply inside the apparatus. Therefore, it is preferable to use a DC motor. In the case where a motor is used as the driving unit 9, the use of a motor using a fluid bearing results in low vibration, so that more accurate detection can be performed. Reference numeral 10 denotes a serial interface for receiving a control command from the outside and transmitting a detection result and a state of a sensor. Reference numerals 11a, 11b, and 11c are relays for transmitting the detection result to another device. At this time, the other devices include a display device (a liquid crystal display, a siren and a speaker that outputs an alarm sound, and a display device that notifies another person when the human body detection device is abnormal or when the human body is at a predetermined position for an abnormally long time). Flashing or lighting device such as a red light), or a device such as a video camera. Reference numerals 12 and 13 denote DC-DC converters for converting, for example, 33 V DC supplied from the outside to a power supply voltage used internally, and convert them to 12 V DC for the DC motor 8 and 5 V DC for other circuits, respectively.

Next, the intrusion / exit detection means and the correction means will be described in detail with reference to FIG. The component numbers are the same as those in FIG. Therefore, in FIG.
Exit detection means, and 4 is a correction means. 3as, 3
bs and 3cs are A / D conversion circuits 3a, 3b and 3
c output. Reference numerals 4a, 4b, and 4c denote low-pass filters that pass only low-frequency components of the A / D conversion circuit outputs 3as, 3bs, and 3cs. 4d to 4i are adders.
4j, 4k and 4l are comparison circuits. Reference numeral 5a denotes a selector which is a selecting means for selecting and outputting one of the outputs of the low-pass filters 4a, 4b, 4c. 5b is a selector 5a
Is a look-up table (hereinafter, referred to as LUT) for outputting corresponding correction data from the output of FIG.

Next, the operation will be described in detail. A / D conversion circuit outputs 3as, 3bs, and 3cs are output from low-pass filter 4
By a, 4b, and 4c, only low frequency components are extracted. The low-pass filter is set to have a characteristic of sufficiently attenuating a frequency component appearing when a human body is detected. Although the low-pass filter can be realized by various methods, in the present embodiment, in consideration of the fact that it can be realized by a simple circuit and the ease of software processing described later, the sampling period is 0.5 sec,
A 50 sample moving average filter was used. The outputs of the low-pass filters 4a, 4b and 4c are respectively added to adders 4d and 4d.
The correction output of the LUT 5b is added at e and 4f, but the correction value is "0" in a state where intrusion is not detected. The outputs of the adders 4d, 4e, 4f are further added to the adders 4g, 4h, 4i.
, The detection thresholds 6a, 6b, 6c are added. The detection thresholds 6a, 6b, 6c are stored in the memory circuit 8b in advance and set by the control means 6. The comparison circuits 4j, 4k, and 4l output A / D conversion circuit outputs 3as and 3b.
s, 3cs and the outputs of the adders 4g, 4h, 4i are compared, and if A / D conversion circuit output> adder output, a signal "1" is output. The operation will be described by taking as an example a case where a human body enters the area monitored by the light receiving element 1a of the sensor 1. When a human body enters, the sensor element 1a
, The output from the A / D conversion circuit 3a rapidly increases. Since the DC component of the sensor output also increases, the output of the low-pass filter 4a similarly increases, but since the high-frequency component is removed, the output rises more slowly than the output of the A / D conversion circuit 3a. Therefore, ideally, the output of the A / D conversion circuit 3a> the output of the low-pass filter 4a is established, so that intrusion detection can be performed using this comparison output. In consideration of variation due to thermal disturbance, a predetermined detection threshold value 6a is added by an adder 4g,
The comparison circuit 4j compares the output of the A / D conversion circuit with (the output of the low-pass filter 4a + the detection threshold 6a). When A / D conversion circuit output> (low-pass filter 4a output + detection threshold 6a) is satisfied, comparison circuit 4j outputs signal "1" to control means 6. When inputting "1", the control means 6 stops the operation of the low-pass filter 4a according to the detection threshold value 6a. The output of the low-pass filter 4a holds the output at the time of stop. Further, the control means controls the selector 5a so as to select an output other than the output of the low-pass filter 4a by the control signal 6d. In the case of the present embodiment, FIGS.
As will be described in detail with reference to FIG. 6, since the monitoring area of the sensor element 1a and the monitoring area of the sensor element 1b are adjacent to each other, the output of the sensor element 1c is less likely to be affected by the human body detected by the sensor element 1a. The low-pass filter 4c to be processed is selected. After the selection, the control means 6 outputs the control signal 6i and stores the output of the low-pass filter 4c at the time of detecting the human body. The subtractor 5d calculates the difference between the output of the register 5c and the output of the low-pass filter 4c to calculate the change in the background temperature after the detection of the intrusion of the human body. LUT
5b is the output of the reducer 5c and the control signal 6 output from the control means 6.
The correction value is output to the adder 4d based on e. The control signal 6e controls the LUT 5b so that the correction table is selected by the sensor element selected by the selector 5a.

When the human body leaves the monitoring area, if the background temperature does not change, the correction value remains "0", and the output of the A / D conversion circuit 3a drops sharply from the low-pass filter output 4a. As a result, the output of the A / D conversion circuit 3a ≦ (the output of the low-pass filter 4a + the detection threshold 6a) is satisfied, the comparison circuit 4j outputs the output “0”, and the control means 6 detects the exit. In addition, the background temperature may be higher than at the time of intrusion due to the lighting in the toilet when entering the room or the presence of the room for a long time,
The A / D conversion circuit 3 is operated even after the low-pass filter output 4a is reduced due to the temperature around the sensor being lowered due to the operation of the ventilator at the time of entry and the temperature in the monitoring area being relatively increased.
a output> (low-pass filter 4a output + detection threshold 6
Even if a) continues to hold, the A / D conversion circuit 3a
Output ≦ (low-pass filter 4a output + detection threshold 6a
+ Correction value), the exit detection omission does not occur because the correction value that satisfies (+ correction value) is added.

Further, since the configuration shown in FIG. 2 is realized by a digital circuit, it can be realized by converting all the processing to software processing.

Next, a specific configuration of the human body detecting device will be described.

FIG. 3 is a sectional view showing a specific example of the human body detecting device according to one embodiment of the present invention. In FIG. 3, reference numeral 14a denotes a printed circuit board on which A / D conversion circuits 3a, 3b, 3c, control means 6, memory circuits 8a, 8b, serial interface 10, relays 11a, 11b, 11c, and DC-DC converters 12, 13 are mounted. It is. 1
Reference numeral 4b denotes a printed circuit board on which the sensor 1 and the amplifier circuits 2a, 2b, and 2c are mounted. Printed circuit boards 14a, 14b
For example, a ceramic substrate, a laminated substrate, a glass epoxy substrate, or the like is used, and may differ depending on an electronic component or a semiconductor device to be mounted. Reference numeral 15 denotes a signal cable including a plurality of signal lines.
And input / output signals to / from relays 11a, 11b and 11c,
External power is input to the C-DC converters 12 and 13.
Reference numeral 16 denotes a connector for connecting the signal cable 15. Reference numeral 17 denotes a front cover of a device made of a resin material such as acrylobutadiene styrene (ABS), a metal material, a ceramic material, or the like. The front cover 17 has an opening at a portion substantially opposed to the sensor 1. Covers 18a and 18b covering the openings are attached to the front cover 17. Particularly preferably, the surface cover 17 is made of ABS resin, which is very advantageous in terms of moldability, reliability and cost. The covers 18a and 18b are respectively fixed to the front cover 17 using a method such as bonding, screwing, mechanical fixing (providing locking members to each other). Since the cover 18a faces the sensor 1, it is preferable that the cover 18a be a plate-like body made of a material that easily transmits infrared rays (silicon, germanium, oxide semiconductor, high-density polyethylene, or the like). 0.3 to 0.7 mm. The cover 18b is made of polycarbonate,
It is preferable that a resin material such as acryl is formed into a plate-like body, and its thickness is preferably 0.8 to 1.2 mm. Further, the materials of the covers 18a and 18b are not limited to the above materials, and a material suitable for the spectral sensitivity characteristics of the sensor 1 may be selected. 19 is a printed circuit board 14a, 14b,
This is a housing for holding a DC motor and the like. Since the housing 19 is made of a material having high rigidity, the vibration by the driving means 9 and the chopper 7 can be suppressed, and the detection accuracy can be improved.
Preferably, the housing 19 is made of a metal material such as stainless steel or aluminum. In addition, by providing the housing 19 with a shielding property, unnecessary radiation emitted from the human body detecting device itself or electromagnetic waves entering the human body detecting device from the outside can be cut off. The reliability of detection can be improved. As the shield material, a material that absorbs electromagnetic waves or the like or a material that efficiently reflects electromagnetic waves or the like is used. At this time, the shielding material as described above may be provided on the surface of the housing 19, or the housing 19 itself may have such a shielding property. In addition, it is preferable that the housing 19 has a container shape with an open top surface,
In addition, although not shown, by providing a gap or a through hole in a corner portion of the housing 19 or the like, heat in the human body detecting device can be released, and in particular, the detection accuracy of the sensor 1 can be improved. . Reference numeral 20 denotes a cover member provided for protection and dust protection inside the ceiling of the housing 19. Reference numeral 21 denotes a ceiling plate, and all parts of the human body detection device except for the chopper 7 and a part of the wiring are arranged inside the ceiling, and only the front cover 17 is exposed inside the toilet. In addition, you may comprise so that at least one part of the surface cover 17 may be arrange | positioned inside a toilet. That is, a part of the front cover 17 may be inserted into the ceiling plate 21 or may be inserted into the ceiling.

A human body detection system using the human body detection device configured as described above will be described.

FIG. 4 is an explanatory view showing a floor monitoring area of the human body detecting device according to the embodiment, FIG. 5 is an explanatory view showing a side view monitoring area, and FIG. 6 is an explanatory view showing a front view monitoring area.
In FIG. 4, reference numeral 22 denotes a monitoring area of the light receiving element 1a. In the monitoring area 22, the monitoring area behind the toilet seat corresponds to 22a in FIG. 5, and detects the vicinity of the head of a seated human body. In the monitoring area 22, the monitoring areas on both sides of the toilet seat correspond to 22b and 22c in FIG. 6, and detect the vicinity of both shoulders of the seated human body. 2
Reference numeral 3 denotes a monitoring area for the light receiving element 1b for detecting the knee of the seated human body and the vicinity of the center of the toilet,
Detects passing and falling conditions. Reference numeral 24 denotes a monitoring area of the light receiving element 1c which detects the vicinity of the toilet entrance X, and detects a stopped state, a passing state, and a falling state of the human body. 5 and 6, reference numeral 25 denotes a human body detection device according to the present invention. FIG.
5 and 6, reference numeral 26 denotes a toilet seat on the toilet. In FIG. 5, reference numeral 27 denotes a water tank behind the toilet. In the above configuration, as shown in FIG. 4, the monitoring areas 21, 22, and 23 of the pyroelectric infrared sensor are configured so as not to form a non-detection area of 25 cm or more in an area on the toilet floor where a human body can fall down. In consideration of the formation accuracy of the light receiving elements 1a, 1b, and 1c, if a non-detection area of 7 cm or less is provided,
Accurate detection cannot be performed due to the difference in detection degree or the transmission of heat between the light receiving elements. That is, the interval is preferably 7 cm or more and 25 cm or less.

Next, the operation of the human body detecting device 25 in the toilet according to the embodiment will be described with reference to FIGS. First, when the human body enters the toilet, the infrared light from the human body is focused on the light receiving element 1c corresponding to the monitoring area 24 near the toilet entrance X via the cover 18a and the light collecting unit 1d, and a large voltage output is output to the light receiving element 1c. Causes a large change in the background temperature output.
The control means 6 determines the presence of a human body through the operation described with reference to FIG. At the same time, the relay 11a is turned on. At this time, the correction means is A
The output of the / D conversion circuit 3a is selected and the background temperature of the monitoring area 22 is used. Next, since the human body passes through the monitoring area 23, the human body reacts to the light receiving element 1b, and the control means 6 determines the presence of the human body. At this time, the occupancy determination in the monitoring area 24 disappears, but since there is a continuous occupancy determination in another monitoring area, the timer measurement is continued. In the case of the monitoring area 23, the background temperature of the monitoring area 24 is used for correction. Next, when the human body sits on the toilet seat 26, it reacts to the light receiving elements 1a and 1b corresponding to the monitoring area 22 and, depending on the posture, the monitoring area 23, and the control means 6 determines the presence of the human body. Next, when the human body normally adds a task and leaves the toilet seat 26, the determination from the monitoring area 22 disappears. Further, the human body passes through the monitoring area 23 and exits through the monitoring area 24, but finally the determination of the monitoring area 24 disappears, and the output of the light receiving element 1c corresponding to the monitoring area 24 that detects the vicinity of the toilet entrance X is output. The operation of the timer is stopped on condition that it occurs and disappears, the exit means is determined by the control means 6, and the relay 11a is turned off.

In this embodiment, the monitoring area used for the background temperature correction is appropriately selected using the selector 4a. However, in the case of a toilet, the monitoring area 22 or 23 generally stays for a long time. In most cases, background temperature correction is required when there is a human body in this monitoring area. Therefore, it is possible to adopt a simple configuration in which the monitoring area used for the correction is fixed to the area 24.

[0041]

As described above, according to the present invention, correction can be performed without providing an independent background temperature correction area, and an unmonitoring area does not occur, thereby improving detection performance. In addition, since the correction area can be appropriately selected, it is possible to easily cope with various toilets having different monitoring area shapes and arrangements.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a human body detection device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of an intrusion / exit detection unit and a correction unit according to an embodiment of the present invention;

FIG. 3 is a sectional view showing a specific example of a human body detection device according to an embodiment of the present invention;

FIG. 4 is an explanatory diagram showing a floor monitoring area of the human body detection device according to the embodiment of the present invention;

FIG. 5 is an explanatory diagram showing a side view monitoring area of the human body detection device according to one embodiment of the present invention;

FIG. 6 is an explanatory diagram illustrating a front view monitoring area of the human body detection device according to one embodiment of the present invention;

7A is a top cross-sectional view of a sensor according to an embodiment of the present invention. FIG. 7B is a cross-sectional view of the sensor according to one embodiment of the present invention.

FIG. 8 is a structural diagram of a pyroelectric element according to an embodiment of the present invention.

FIG. 9 is a layout diagram showing the layout of a conventional human body detection device.

FIG. 10 is a configuration diagram of a conventional human body detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sensor 1a-1c Light receiving element 1d Condensing part 1e Light receiving element part 1f Hermetic base 1g Input / output pin 1h Metal cover 1i Pyroelectric element 11 Sealing member 2a, 2b, 2c Amplifier circuit 3a, 3b, 3c Analog-digital conversion circuit 3as, 3bs, 3cs A / D conversion circuits 3a, 3b,
3c output 4 intrusion / exit detection means 4a, 4b, 4c low-pass filter 4d-4i adder 4j, 4k, 4l comparison circuit 5 correction means 5a selection means 5b lookup table 6 control means 6a, 6b, 6c detection threshold Value 7 Chopper 7a Slit 8a, 8b Memory circuit 9 Driving means 10 Serial interface 11a, 11b, 11c Relay 12, 13 DC-DC converter 14a, 14b Printed circuit board 15 Signal cable 16 Connector 17 Front cover 18a, 18b Cover 19 Housing 20 Cover member 21 Ceiling plate 22 Monitoring area 23 Monitoring area 24 Monitoring area 25 Human body detection device 26 Toilet seat 27 Rinse tank 28 Toilet door 29 Lighting in toilet 30 Ventilation fan in toilet 31 Toilet in toilet 32 Pyroelectric infrared sensor 33 Pyroelectric Type Monitoring area 34 lens 35a by external sensors 32, 35b, 35c pyroelectric infrared sensor 36c, 36b, 36c amplifier 37a, 37b, 37c pass filter 38a, 38b, 38c adders 39a, 39b, 39c comparator 40 CPU

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D038 KA02 2G065 AB02 BA13 BA32 BA36 BA37 BB25 BB37 BC02 BC03 BC14 BC16 BC19 BC22 BC28 BC33 BC35 CA21 DA01 DA20 5C086 AA22 BA04 CA12 CB16 DA01 DA08 EA11 EA15 EA32 EA40

Claims (5)

[Claims] A plurality of infrared sensors for detecting heat of a human body, which are arranged so as to divide and monitor a monitoring area, and detecting and leaving the human body in a monitoring area based on a change in an output of the infrared sensor. A human body detection device comprising: an intrusion / exit detection unit that performs detection; and a correction unit that corrects the exit detection based on a change in the output of the infrared sensor that does not detect the human body. 2. A correction means comprising a selection means for designating and selecting one of a plurality of signals as a correction means, and selecting and correcting the output of the infrared sensor according to an installation environment or an arrangement of the infrared sensor. 2. The human body detecting device according to claim 1, wherein a means is used. 3. A plurality of infrared sensors arranged to monitor the inside of a toilet while monitoring the temperature of a human body, and detecting detection of intrusion and exit of the human body into a monitoring area based on a change in sensor output. An ingress / exit detection means for performing the detection, and a correction means for correcting the exit detection based on a change in the output of the infrared sensor that does not detect the human body, wherein at least one of the plurality of infrared sensors is seated on a toilet seat. The monitoring area A which does not detect the human body in a depressed state, and wherein the correction means exits from the monitoring area B which detects the human body sitting on the toilet seat based on the output of the infrared sensor for monitoring the monitoring area A. A human body detection device for correcting detection. 4. A correction means comprising a selection means for designating and selecting one from a plurality of signals, and a correction means for selecting and correcting the output of the infrared sensor according to an installation environment or an arrangement of the infrared sensor. 4. The method according to claim 3, wherein
3. The human body detection device according to 1. 5. The human body detecting device according to claim 1, wherein the plurality of infrared sensors are pyroelectric infrared sensors.