JP2001304957A - Pyroelectric infrared sensor and method and device for detecting human body using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pyroelectric infrared sensor as well as method and device for detecting a human body which detects a human body in any attitude present in a specified detection space at various places without being limitted to a toilet, utilizing a heat source present in the space. SOLUTION: There are provided a pyroelectric infrared sensor comprising 2-4 non-square detecting electrodes 2a-2c providing separate outputs in the same package, an infrared transmitting lens for optically controlling a detection area, a means for modulating the incident light on the pyroelectric infrared sensor, and a means for judging attitude of a human body utilizing at least one output among the outputs corresponding to the detection areas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pyroelectric infrared sensor and a pyroelectric infrared sensor capable of detecting the presence of a human body in a specific space such as a living space, a toilet, a passage, etc. with high accuracy and transmitting an alarm or information. And a human body detection device using the same.

[0002]

2. Description of the Related Art Conventionally, various types of human body detecting devices for detecting the presence of a human body have been used. Among them, a conventional human body detection device for detecting an abnormality of a human body in a toilet at an early stage will be described with reference to the drawings.

FIG. 8 is an explanatory diagram showing human body detection in a toilet human body detection device disclosed by the present applicant for the purpose of continuously detecting a human body without being affected by a heating toilet seat.

In FIG. 8, reference numeral 27 denotes a human body detecting device installed on a toilet wall, 28a denotes a left side detection area of three pyroelectric infrared sensors that modulate incident light by a chopper, 28b denotes a center detection area, and 28c denotes a right side. The side detection area 29 indicates a toilet seat in the toilet. Note that the left side detection area 28a, the center detection area 28b, and the right side detection area 28c are all set so as not to include any part of the toilet seat 29.

The operation of detecting a human body in a toilet in the conventional human body detecting device 27 configured as described above will be described.

When the human body enters the toilet and sits on the toilet seat 29 in a normal posture, the center detection area 28b mainly detects heat energy from the human body and generates a large output to the corresponding pyroelectric infrared sensor. , The determination circuit determines the presence of a human body. Next, when the human body leans against the wall due to some abnormality, for example, leans against the wall surface on the right side detection area 28c side, the right side detection area 28c
A large output is obtained from the pyroelectric infrared sensor corresponding to (1), and conversely, the output of the pyroelectric infrared sensor corresponding to the center detection area 28b becomes small. The magnitude of the output of each pyroelectric infrared sensor corresponding to the three detection areas is compared and calculated by the determination circuit, so that not only the presence of the human body but also the posture can be determined.

[0007] However, the detection area of the human body detecting device 27 is limited, and there is a problem that a human body that falls particularly on the back of the toilet or on the side of the toilet cannot be detected.

FIG. 9 shows a human body detecting apparatus for detecting a human body in a toilet which has solved such a problem.
This will be described with reference to FIG.

FIG. 9 is an explanatory view showing a floor detection area of a conventional human body detecting device, FIG. 10 is an explanatory view showing a side view detection area in a conventional example, and FIG. 11 is an illustration showing a front view detection area in a conventional example. FIG.

In FIG. 9, reference numeral 31 denotes a floor detection area of the distance measuring sensor, which corresponds to 31a in FIG. 10 and 31b in FIG. Reference numeral 32 denotes a floor detection area of the pyroelectric infrared sensor including at least any part of the human body. The detection area behind the toilet seat 35 in the floor detection area 32 of the pyroelectric infrared sensor corresponds to 32a in FIG. 10 and detects the vicinity of the head of a seated human body. In the floor surface detection area 32 of the pyroelectric infrared sensor, the detection areas on both sides of the toilet seat 35 correspond to 32b and 32c in FIG. 11, and detect the vicinity of both shoulders of the seated human body. The detection area in front of the toilet seat 35 in the floor detection area 32 of the pyroelectric infrared sensor corresponds to 32d in FIG. 10 and detects the vicinity of the knee and the standing position of the seated human body. Reference numeral 33 denotes a floor detection area of a pyroelectric infrared sensor that detects both sides of the toilet and the front of the toilet 35 that do not include any part of the seated human body. The detection area on both sides of the toilet seat 35 in the floor detection area 33 of the pyroelectric infrared sensor is shown in FIG.
1 corresponds to 33a and 33b, and detects a state in which the human body leans on the wall surface. The detection area in front of the toilet seat 35 in the floor detection area 33 of the pyroelectric infrared sensor is shown in FIG.
33c, the stop, the passing, and the falling state of the human body are detected. Numeral 34 denotes a floor detection area of a pyroelectric infrared sensor for detecting a toilet entrance, which does not include any part of the human body, and corresponds to 34a in FIG. 10 and detects a stopped state, a passing state, and a falling state of the human body.

In FIG. 10 and FIG. 11, reference numeral 30 denotes a human body detecting device, which includes a pyroelectric infrared sensor, a chopper, a distance measuring sensor, and a judgment circuit, and is installed on a ceiling in a toilet.

Next, the operation of the human body detecting device 30 will be described.
This will be described with reference to the drawings.

First, when a human body enters the toilet, the pyroelectric infrared sensor which receives energy from the detection area corresponding to the floor detection area 34 of the pyroelectric infrared sensor at the entrance of the toilet reacts, and the determination circuit detects the presence of the human body. The timer starts counting at the same time. Next, since the human body passes through the detection area corresponding to the floor detection area 33 of the pyroelectric infrared sensor, the determination circuit determines the presence of the human body. At this time, the occupancy determination from the detection area corresponding to the floor detection area 34 of the pyroelectric infrared sensor disappears, but the timer measurement is continued because there is a continuous occupancy determination in another area. Next, when the human body is seated on the toilet seat 35, it reacts with the pyroelectric infrared sensor that receives energy from the detection area corresponding to the floor detection area 32 of the pyroelectric infrared sensor, and the determination circuit determines the presence of the human body, At the same time, the distance measurement sensor also determines the presence of a human body. At this time, if either the pyroelectric infrared sensor or the distance measurement sensor has determined the presence of a human body, the determination during sitting is not overridden, and the timer operation is continued.

Next, when the human body normally adds a task and leaves the toilet seat 35, the determination from the detection areas corresponding to the floor detection area 32 of the pyroelectric infrared sensor and the floor detection area 31 of the distance measuring sensor disappears. Then, the human body passes through a detection area corresponding to the floor detection area 33 of the pyroelectric infrared sensor,
The pyroelectric infrared sensor exits through a detection area corresponding to the floor detection area 34. At this time, the determination of the floor detection area 32 of the pyroelectric infrared sensor and the determination of the floor detection area 31 of the distance measurement sensor eventually disappear, and the pyroelectric infrared sensor corresponding to the floor detection area 33 of the pyroelectric infrared sensor finally disappears. After the output of the infrared sensor is generated, the operation of the timer is stopped on condition that the output of the pyroelectric infrared sensor corresponding to the floor detection area 34 of the pyroelectric infrared sensor is generated with a certain time difference and disappears. Then, the leaving circuit is determined by the determining circuit.

When an abnormality such as loss of consciousness of the human body occurs while sitting after sitting in the room, it is determined that the output from one of the sensors continues and a timer elapses a preset time. The circuit makes an abnormality determination and generates an alarm output.

[0016]

The conventional human body detecting device 30 shown in FIGS. 9 to 11 continuously detects a stationary human body falling in an arbitrary range while avoiding a specific heat source such as a heating toilet seat. It is possible.

However, the object to be detected is the size or the toilet seat 35.
Since the toilet is limited to a toilet whose position and the like are specified in advance, the use is limited to detection of a human body in the toilet. In the toilets of various shapes that actually exist, there is a gap in the detection area, that is, there is an area where a human body cannot be detected in the space, and the human body in the detection area may be missed. Similarly, when a plurality of heat sources and three-dimensional objects other than the toilet seat exist in the detection space, the detection accuracy may be reduced.

The present invention is not limited to a toilet, but includes a pyroelectric infrared sensor capable of detecting the presence of a human body in any state in a specific detection space at various places without erroneous detection by a heat source existing in the space. An object of the present invention is to provide a human body detection method and a human body detection device using the same.

[0019]

A pyroelectric infrared sensor according to the present invention comprises a pyroelectric substance having a pyroelectric effect, two or more detection electrodes formed on the pyroelectric substance, and each of these detection electrodes. Are provided in the same package, and the detection electrodes have a non-quadrilateral shape and are all different from each other.

In the human body detection method according to the present invention, a non-overlapping and non-quadrangular pyramid-shaped three-dimensional detection area of 2 or more and 4 or less is constituted by using a pyroelectric infrared sensor in an arbitrary detection space. It is characterized in that the state of the human body is determined using at least one or more outputs among the independent outputs corresponding to each detection area.

Further, the human body detecting device according to the present invention comprises a pyroelectric infrared sensor having two to four independent outputs and a non-quadrilateral detecting electrode in the same package; An infrared transmitting lens for controlling an area, a means for modulating light input to the pyroelectric infrared sensor, and at least one of outputs corresponding to each detection area.
A means for determining the state of the human body using the above output is provided.

According to the pyroelectric infrared sensor of the present invention, since the detection area can be arranged according to the shape of the detection space by forming the detection electrode into a non-quadrilateral shape, a human body existing in the detection space can be arranged. Thus, a human body detection method and a human body detection device capable of detecting the entirety of the object and preventing the detection area from overlapping a space that adversely affects the detection accuracy of a thermal object or the like can be obtained. Further, since the detection electrode area can be reduced with respect to the effective detection area, the pyroelectric infrared sensor itself can be reduced in size, and the human body detection device itself can be reduced in size.

According to the human body detection method and the human body detection device of the present invention, by arranging the detection area in accordance with the shape of the detection space, it is possible to detect any state of the human body existing in the detection space without fail. Since it is easy to prevent the detection area from overlapping a space that adversely affects the detection accuracy of a thermal object or the like, highly accurate human body detection is possible.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a pyroelectric body having a pyroelectric effect, two or more sensing electrodes formed on the pyroelectric body, and a plurality of sensing electrodes corresponding to each of these sensing electrodes. A pyroelectric infrared sensor that is equipped with electrically independent circuits in the same package, and has a non-quadrilateral outer shape of the detection electrodes, all of which differ from each other.The detection area matches the shape of the detection space. A human body detection method and a human body detection device that can detect a human body existing in a detection space without fail because it can be arranged in a detection space, and can prevent a detection area from overlapping a space that adversely affects the detection accuracy of a thermal object or the like Is obtained. Further, since the detection electrode area can be reduced with respect to the effective detection area, the pyroelectric infrared sensor itself can be reduced in size, and the human body detection device can be reduced in size.

According to a second aspect of the present invention, there is provided the pyroelectric infrared sensor according to the first aspect, wherein the number of sensing electrodes is four or less, and the number of parts in the same package can be reduced. In addition, the pyroelectric infrared sensor itself and the optical system can be reduced in size, and the number of circuits of the human body detection device can be reduced, so that a low-cost human body detection device can be provided.

According to a third aspect of the present invention, two or more and four or less non-overlapping and non-quadrangular pyramid-shaped three-dimensional detection areas are formed in an arbitrary detection space by using a pyroelectric infrared sensor.
A human body detection method characterized in that a state of a human body is determined using at least one or more outputs among independent outputs corresponding to respective detection areas, and the detection areas are arranged according to the shape of a detection space. This makes it easy to detect the human body in the detection space without leakage, and at the same time, it is easy to avoid overlapping the detection area in a space that adversely affects the detection accuracy of thermal objects, etc. It has the effect of becoming.

According to a fourth aspect of the present invention, a part of at least one or more of the three-dimensional detection areas is provided, regardless of the position of the human body in any position in the detection space below the height of the human body. 4. A method for detecting a human body according to claim 3, wherein a part or the whole of the human body is inserted into the human body, and has an effect that the human body in the detection area can be reliably detected without depending on the state of the human body. .

According to a fifth aspect of the present invention, there is provided a pyroelectric infrared sensor having two to four independent outputs and a non-quadrilateral detection electrode in the same package, and an optical detection area. An infrared transmitting lens for controlling the light, a means for modulating light incident on the pyroelectric infrared sensor, and a means for determining a state of a human body by using at least one or more of outputs corresponding to each detection area. It is a human body detection device characterized by having a detection area.By arranging the detection area according to the shape of the detection space, it is easy to detect the human body existing in the detection space without fail, and at the same time, the detection accuracy of thermal objects etc. Since it is easy to prevent the detection area from overlapping the space that adversely affects the human body, there is an effect that highly accurate human body detection is possible.

Hereinafter, embodiments of a pyroelectric infrared sensor, a human body detecting method and a human body detecting device using the same according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the pyroelectric infrared sensor according to the embodiment, and FIG. 2 is a top perspective view of the pyroelectric infrared sensor according to the embodiment.

In FIG. 1, reference numeral 1 denotes a pyroelectric body built in the pyroelectric infrared sensor according to the embodiment, which has a thickness of 50%.
It is made of a polycrystalline lead titanate-based material having a thickness of μm. 2a, 2
b and 2c are detection electrodes formed on the pyroelectric body 1,
It is made of a Nichrome alloy having a thickness of 0.1 μm. 3a is a compensation electrode of the detection electrode 2a, 3b is a compensation electrode of the detection electrode 2b, 3
c is a compensation electrode of the detection electrode 2c, and the detection electrodes 2a to 2c
Similar to c, it is made of a nichrome alloy having a thickness of about 0.1 μm.
These compensating electrodes 3a to 3c are for compensating output due to vibration and temperature change applied to the pyroelectric infrared sensor itself, and are set to have substantially the same area as the detecting electrodes 2a to 2c. Are arranged at positions where light does not enter. The detection electrodes 2a to 2c and the compensation electrodes 3a to 3c
On the opposite surface of the substrate c, electrodes having exactly the same shape are formed with the pyroelectric body 1 interposed therebetween.

Reference numeral 4 denotes a printed circuit board, on which an operational amplifier 5 for output amplification and a feedback resistor 6 are soldered.
The pyroelectric body 1 is mechanically and electrically fixed with a conductive adhesive. The operational amplifier 5 has a quad-type specification in which four circuits are incorporated in the same package, and three of them are used. Further, in the present embodiment, a current amplifier circuit using the operational amplifier 5 and the feedback resistor 6 is configured, but a voltage amplifier circuit using an FET can be used. Reference numeral 7 denotes a hermetic base, 8 denotes an input / output pin, 9 denotes a metal cap welded to the hermetic base 7, and 10 denotes an infrared transmission window made of silicon, which is adhered to the metal cap 9. The combination of the hermetic base 7, the metal cap 9 and the infrared transmission window 10 constitutes a package of a pyroelectric infrared sensor that maintains airtightness and shielding.

FIG. 3 is a sectional view of the human body detecting device according to the embodiment, and FIG. 4 is a bottom perspective view of the human body detecting device according to the embodiment.

In the drawing, reference numeral 11 denotes a pyroelectric infrared sensor according to the present embodiment, 12 denotes a lens having a focal length of about 4 mm in which silicon has been subjected to anti-reflection treatment, and 13 denotes a slit formed in a disc for modulating incident light. And modulates the incident light to the pyroelectric infrared sensor 11 at a cycle of 20 Hz. Reference numeral 14 denotes a DC motor for rotating the chopper 13. 15 is thickness 0.5
This is an infrared incident window for a pyroelectric infrared sensor 11 made of high-density polyethylene of 1 mm. Through this window, infrared rays having a wavelength of about 9 μm generated from the human body enter the lens 12. Reference numeral 16 denotes a signal processing circuit which independently performs amplification, filtering, and the like on the modulated AC waveform sent from the pyroelectric infrared sensor 11. Reference numeral 17 denotes a determination processing circuit including a microcomputer, which samples and digitally converts the wave height of the signal sent from the signal processing circuit 16 and constantly monitors the digital value of the background corresponding to each detection area, while monitoring the digital value of the background. When a change exceeding an arbitrary threshold value occurs, the detection of a human body in each detection area is determined. After the detection of the human body is confirmed, the timer in the microcomputer is activated, and when the detection confirmation state exceeds a preset time, the alarm state is decided. Reference numeral 18 denotes an input / output terminal for outputting the obtained determination result and inputting the operation power. Reference numeral 19 denotes a printed circuit board for electrically and mechanically connecting the pyroelectric infrared sensor 11, the signal processing circuit 16, the determination processing circuit 17, and the input / output terminal 18, and 20 denotes an outer case.

FIG. 5 is a sectional view of a toilet provided with the human body detecting device according to the embodiment, and FIG. 6 is a floor view of the toilet provided with the human body detecting device according to the embodiment.

5 and 6, reference numeral 21 denotes a human body detecting device according to the present embodiment, 22 denotes a toilet in a toilet using a heated toilet seat, 23 denotes a washstand in a toilet provided with a tap for hot and cold water, 25 is a toilet door. 24a
Is a pyroelectric infrared sensor 1 built in the human body detecting device 21
5 shows a floor detection area corresponding to one detection electrode 2a. Similarly, reference numeral 24b denotes a floor detection area corresponding to the detection electrode 2b of the pyroelectric infrared sensor 11 built in the human body detection device 21, and reference numeral 24c denotes a floor detection area corresponding to the detection electrode 2c. The floor detection areas 24a to 24c in the toilet corresponding to the respective detection electrodes 2a to 2c have a three-dimensional cone shape having the bottom as its own and the lens 12 as the apex.

Next, basic operations of the pyroelectric infrared sensor 11 and the human body detecting device 21 according to the embodiment will be described with reference to the drawings.

Detection electrode 2a in pyroelectric infrared sensor 11
2c receives the difference between the thermal energy received from the chopper 13 and the energy received from each detection area via the infrared transmission window 10 according to the opening and closing of the rotating chopper 13, and has a magnitude corresponding to the difference, and An AC output having a frequency corresponding to the frequency is output to each of the detection electrodes 2a to 2a.
Occurs during c. The generated AC output is amplified by an amplifier circuit including an operational amplifier 5 and a feedback resistor 6 for each output corresponding to each of the detection electrodes 2 a to 2 c and output from the input / output terminal 18. Even if no human body exists in the toilet, in a normal case, there is a difference between the energy received from the chopper 13 and the energy received from the detection area, so that an AC output is generated from the input / output terminal 18. This AC output enters the signal processing circuit 16 of the human body detecting device 21 and further amplifies the signal and removes noise for each output corresponding to each of the detection electrodes 2a to 2c. Further, this output is A / D-converted by the determination processing circuit 17 for each output corresponding to each of the detection electrodes 2a to 2c. The presence of a human body is determined every 2a to 2c. Also, 3
When a human body is present in any one or more of the determinations for each of the detection electrodes 2a to 2c, a human body detection signal is transmitted from the input / output terminal 18. In addition, when a state in which a human body is present in any one or more of the three detection electrodes 2a to 2c has passed a preset time, a warning signal is transmitted from the input / output terminal 18.

Next, the shapes of the detection electrode and the detection area will be described with reference to the drawings.

The detection electrodes 2a to 2c are respectively connected to the floor detection areas 24a to 24c through the lens 12 and the infrared ray incident window 15.
A three-dimensional pyramid-shaped detection area corresponding to 24c is formed, and this shape is determined by the shapes of the detection electrodes 2a to 2c. Each detection electrode 2a-2c and floor detection area 24
The shapes of a to 24c are formed according to an object existing in the detection space actually used. In the present embodiment, a private toilet for nursing care is assumed, and in addition to a toilet 22 with a heated toilet seat, a wash basin 23 for handling hot water is present in the toilet, so that these thermal noise sources are avoided and The detection electrodes 2a to 2c and the floor surface detection areas 24a to 24c are configured so that any part of the human body enters the detection area in any of the following human body states (1) to (6).

(1) Stand on the floor in the detection area.

(2) Fall on the floor in the detection area.

(3) Squat down in the detection area.

(4) Sit on the floor in the detection area.

(5) Lean on the wall surface in the detection area.

(6) Sit on a seating part in the detection area.

Under these conditions, it is necessary for high-precision human body detection to cover the widest possible area with as few detection electrodes 2a to 2c and floor detection areas 24a to 24c as possible. .

More specifically, the three-dimensional detection area corresponding to the floor surface detection area 24a is located at the left side in the entry direction from the toilet door 25 except for the periphery of the toilet 22 and on the side of the wash basin 23 as described in (1) and (2) above. ), (3), (4), and (5) are adjusted so that the human body part enters. The three-dimensional detection area corresponding to the floor detection area 24b is located on the right side in the entrance direction from the toilet door 25 except for the periphery of the toilet 22 and on the front of the wash basin 23 as described in (1),
In any of the states (2), (3), (4), and (5), adjustment is made so that the part of the human body enters. The three-dimensional detection area corresponding to the floor detection area 24c is any one of (1), (2), (3), (4), and (5) around the toilet, and (6) on the toilet 22. It is adjusted so that the part of the human body enters even in the state. Three floor detection areas 24a
Since the three-dimensional detection areas corresponding to .about.24c are configured to three-dimensionally avoid the positions of the toilet 22 and the wash basin 23, erroneous detection due to thermal noise cannot occur. In the present embodiment, the detection electrodes 2a to 2c and the floor detection areas 24a to 24c are configured as polygons. However, the same effect can be obtained even if the detection electrodes 2a to 2c are configured to have only corner curves or to include curves. Is obtained.

FIG. 7 is a floor view of a toilet showing a comparative example with the embodiment. The three-dimensional detection area corresponding to the floor surface detection area 26c is for detecting the periphery of the toilet 22 and a seated human body. However, if the heating toilet seat of the toilet 22 is used, the three-dimensional detection area exists even when the human body does not exist. It is highly possible that a malfunction occurs as if the human body is not present even if it exists. In order to prevent this, the detection electrodes 2a to 2c may be divided so as to avoid the toilet 22.
The number of circuits inside the pyroelectric infrared sensor 11 increases due to the division of ~ 2c, so that the size and cost of the sensor itself increase, and the number of circuits of the human body detection device also increases, so that the size and cost of the human body detection device also increase. become. On the other hand, in the present invention, as shown in FIG.
By forming the non-square shape of 2c and the non-square pyramid shape of the detection area, the number of circuits is small and the heat source is not affected.

Further, if the floor surface detection area 26a has a square shape as in the comparative example shown in FIG. 7, a large non-detection area is generated between the floor surface detection area 26a and the wash basin 23, so that a human body cannot be detected at this position. Probability is high. In order to prevent this, it is necessary to increase the number of detection electrodes, and the same problem as described above occurs. On the other hand, in the present invention, the detection electrode is formed in a non-square shape and the detection area is formed in a non-square pyramid shape, so that a small number of circuits can cover a small detection space. In the above example, it has been described that a smaller number of sensing electrodes and a smaller number of sensing areas are preferable in terms of size and shape.
Conversely, if the number of detection electrodes is too small, for example, when detecting an arbitrary detection space with one non-square detection electrode and the detection area, the ratio of the heat energy received from the human body to the total heat energy received from the detection area is small. This makes it difficult to detect a human body particularly at the end of the detection area. Conversely, only a very small space can be detected in order to increase the detection accuracy. These dimensions, cost, detection accuracy,
Considering the effect on the size of the detection space, the number of practical detection electrodes and detection areas is between 2 and 4, inclusive.

Further, when the detection electrodes are square as in the comparative example, the actual area of each detection electrode becomes large. Therefore, in order to form a compensating electrode having the same area at a position where infrared rays do not enter, focus is required. Since a large pyroelectric body is required in the electric infrared sensor 11, dimensional restrictions occur, and the pyroelectric infrared sensor 11 becomes large. On the other hand, in the present invention, the detection electrodes 2a to 2c are formed in a non-square shape and the floor detection areas 24a to 24c are formed in a non-square pyramid shape.
Since it is possible to reduce the substantial area of the detection electrode as compared with the square detection electrode, the compensation electrode 3a having the same area is used.
The size of the pyroelectric body 1 can be suppressed to be small in addition to the area of up to 3c. That is, the pyroelectric infrared sensor 11 and the human body detection device 21 can be reduced in size.

The comparative example shown in FIG. 7 is an example, and other configurations using a partially non-quadrilateral sensing electrode and sensing area are also possible. However, if the shape of the detection area is complicated and there are more noise sources and the like, the above-mentioned problem definitely occurs. Conversely, according to the present invention, highly accurate human body detection is possible even in a detection area other than a toilet where a complicated shape or a large number of heat sources exist.

For the above reasons, the detection electrodes 2a to 2c are formed in a non-quadrilateral shape, and the floor detection areas 24a to 24c are formed in a non-square pyramid shape. The required floor detection areas 24a to 24a
It is clear that the entire body 4c can be detected, which leads to higher precision, smaller size, and lower cost of the human body detection device 21.

According to the pyroelectric infrared sensor 11 of the embodiment configured as described above, the following operations are provided.

Pyroelectric body 1 having pyroelectric effect and pyroelectric body 1
The two or more sensing electrodes 2a to 2c formed above and electrically independent circuits respectively corresponding to the sensing electrodes 2a to 2c are provided in the same package, and the outer shape of the sensing electrodes 2a to 2c is made into a non-quadrilateral shape. And all have different configurations. This configuration has an effect of being able to provide the human body detection method and the human body detection device 21 that are not affected by the noise of the heat source and that can set the floor surface detection area to any shape of the detection space.

According to the human body detecting method in the embodiment configured as described above, the following operations are provided.

Using a pyroelectric infrared sensor 11 for an arbitrary detection space, two or more and four or less non-overlapping, non-square pyramid-shaped three-dimensional detection areas are formed, and independent detection areas corresponding to the respective detection areas are formed. The state of the human body is determined using at least one of the outputs. With this configuration, small size,
Inexpensive and unaffected by heat sources in the sensing space,
A human body detecting device 2 capable of detecting a human body in any state existing in a detection space with high accuracy even in a detection space having a complicated shape.
1 can be provided.

According to the human body detecting device 21 in the embodiment configured as described above, the following operations are provided.

Non-quadrilateral sensing electrodes 2a to 2 having independent outputs of 2 to 4 in the same package.
Pyroelectric infrared sensor 11 provided with 2c, a lens 12 for transmitting infrared light for optically controlling the detection area, means for modulating light incident on the pyroelectric infrared sensor 11, and each floor detection area Means for judging the state of the human body using at least one output among the outputs corresponding to. With this configuration, despite its small size and low cost, it is not affected by the heat source existing in the detection space, and it can detect humans in any state in the detection space with high accuracy even in a detection space of complicated shape. Having.

[0060]

According to the first aspect of the present invention, there is provided a human body detecting method and a human body detecting apparatus capable of setting a detection area all over an arbitrary detection space shape without being affected by noise of a heat source. The size of the pyroelectric infrared sensor and the human body detection device can be reduced.

According to the invention described in claim 2, according to claim 1
In addition to the effects described above, a low-cost human body detection method and a human body detection device can be provided.

According to the third aspect of the present invention, the human body existing in the detection space is highly accurate even in a detection space having a complicated shape without being affected by a heat source existing in the detection space at a small size and at low cost. Can provide a human body detection device that can be detected by a human body.

According to the invention set forth in claim 4, according to claim 1
In addition to the effects described above, it is possible to provide a human body detection device that can detect a human body in any state with high accuracy.

According to the fifth aspect of the present invention, despite being small in size and low in cost, it is not affected by a heat source existing in the detection space, and even if the detection space has a complicated shape, it can be used in any detection space. The human body in the state can be detected with high accuracy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pyroelectric infrared sensor according to an embodiment;

FIG. 2 is a top perspective view of a pyroelectric infrared sensor according to the embodiment.

FIG. 3 is a cross-sectional view of the human body detection device according to the embodiment.

FIG. 4 is a bottom perspective view of the human body detection device according to the embodiment;

FIG. 5 is a cross-sectional view of a toilet provided with the human body detection device according to the embodiment.

FIG. 6 is a floor view of a toilet provided with the human body detection device according to the embodiment.

FIG. 7 is a floor view of a toilet showing a comparative example with the embodiment.

FIG. 8 is an explanatory diagram showing human body detection in a toilet human body detection device disclosed by the present applicant for the purpose of continuously detecting a human body without being affected by a heated toilet seat.

FIG. 9 is an explanatory diagram showing a floor detection area of a human body detection device in a conventional example.

FIG. 10 is an explanatory diagram showing a side view detection area in a conventional example.

FIG. 11 is an explanatory view showing a front view detection area in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pyroelectric body 2a Detection electrode 2b Detection electrode 2c Detection electrode 3a Compensation electrode 3b Compensation electrode 3c Compensation electrode 4 Printed circuit board 5 Operational amplifier 6 Feedback resistance 7 Hermetic base 8 Input / output pin 9 Metal cap 10 Infrared transmission window 11 Pyroelectric infrared sensor DESCRIPTION OF SYMBOLS 12 Lens 13 Chopper 14 DC motor 15 Infrared incident window 16 Signal processing circuit 17 Judgment processing circuit 18 Input / output terminal 19 Printed circuit board 20 Outer case 21 Human body detecting device 22 Toilet bowl 23 Washing stand 24a Floor detecting area 24b Floor detecting area 24c Floor Surface detection area 25 Toilet door 26a Floor detection area 26b Floor detection area 26c Floor detection area 27 Human body detector 28a Left side detection area 28b Center detection area 28c Right side detection area 29 Toilet seat 30 Human body detector 31 Floor detection area of distance measurement sensor 31a Side detection area of distance measurement sensor 31b Front detection area of distance measurement sensor 32 Floor detection area of pyroelectric infrared sensor 32a Side view detection area of pyroelectric infrared sensor 32b Pyroelectric Detection area 32c front-view detection area of pyroelectric infrared sensor 32d side-view detection area of pyroelectric infrared sensor 33 floor detection area of pyroelectric infrared sensor 33a front view of pyroelectric infrared sensor Detection area 33b Front view detection area of pyroelectric infrared sensor 33c Side view detection area of pyroelectric infrared sensor 34 Floor detection area of pyroelectric infrared sensor 34a Side view detection area of pyroelectric infrared sensor 35 Toilet seat

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01V 8/12 H01L 37/02 H01L 37/02 G01V 9/04 A F term (Reference) 2G065 AA04 AB02 BA13 BA32 BB06 BB37 BC14 BC17 BC35 BD06 CA01 DA20 2G066 AC13 BA02 BA22 BA34 BB01 BC15 CA08

Claims (5)

[Claims] 1. A pyroelectric body having a pyroelectric effect, two or more detection electrodes formed on the pyroelectric body, and electrically independent circuits respectively corresponding to the respective detection electrodes are provided in the same package. Wherein the external shape of the detection electrode is a non-quadrilateral shape and all are different. 2. The pyroelectric infrared sensor according to claim 1, wherein the number of detection electrodes is four or less. 3. A non-overlapping and non-quadrangular pyramid-shaped three-dimensional detection area of at least 2 and no more than 4 is formed by using a pyroelectric infrared sensor for an arbitrary detection space. A human body detection method comprising: determining a state of a human body by using at least one or more of the outputs. 4. A part of at least one of the three-dimensional detection areas, wherein at least one of the three-dimensional detection areas includes a part of the human body, 4. The human body detecting method according to claim 3, wherein the whole is inserted. 5. A pyroelectric infrared sensor having two to four independent outputs and having a non-quadrilateral detection electrode in the same package, and infrared transmission for optically controlling the detection area. A lens, means for modulating light incident on the pyroelectric infrared sensor, and means for determining a state of a human body by using at least one output among outputs corresponding to each detection area. Human body detection device.