JPH105180A - Detector for detecting presence on bed and detecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a human body on a bed by providing a first and second infrared sensors on the upper part of a bed, detecting the movement of the human body based on a signal formed by differentiating a signal from the first infrared sensor, and detecting the presence of the human body based on the signal from the second infrared sensor. SOLUTION: Infrared rays emitted near the head part of the human body is detected by a pyroelectric type infrared sensor 21, the output signal from this sensor 21 is differentiated by a differentiating circuit 24, and a slight motion of the human body is detected by a judgment circuit 26 based on its output signal. The infrared rays emitted near the head part of the human body is detected by a thermo pile 22, the output signal from this thermo pile 22 is amplified by an amplifying circuit 25, the output signal from the amplifying circuit 25 is compensated by a compensating circuit 27 based on the output signal of a thermistor 23, and so the presence of the human body is detected by a detecting circuit 28 based on the output signal. The presence of the human body is decided by a timer 29 and a judgment circuit 30 based on the output signals from the judgment circuits 26, 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the presence of a human body in a bed of a hospital or the like using an infrared sensor and a method using the same.

[0002]

2. Description of the Related Art Conventionally, infrared sensors such as pyroelectric sensors and thermopiles, photoelectric switches, and ultrasonic sensors have been used to detect the presence of a human body in a specific area. In particular, there is one that detects a human body by combining a pyroelectric sensor having different detection ranges and detection sensitivities with a thermopile as disclosed in Japanese Patent Application Laid-Open No. 64-39581. This is for detecting the human body entering the toilet or the like and controlling the lighting of the lighting equipment. A point-type sensor is sufficient as a pyroelectric sensor, and room temperature compensation is required as a thermopile. I haven't.

On the other hand, in order to confirm whether a patient is sleeping on a bed in a hospital or the like at night or whether the patient is awake and leaving the bed and wandering, a patrol or a nurse has conventionally checked the patient. And it took a lot of manpower and time.
Further, there is a monitor in which a plurality of pyroelectric infrared sensors and a thermopile are installed horizontally beside the bedside of a bed, such as in Japanese Utility Model Laid-Open No. 4-305504, for monitoring the sleeping state.

[0004]

However, as described above, when a human body is detected by combining a point-type pyroelectric sensor having a different detection range and detection sensitivity with a thermopile that does not compensate for room temperature, The presence of the human body can be detected, but the tremor of the human body (the tremor here is when the head or limb moves from one position to another,
Alternatively, there is a problem that the human body cannot be detected when the room temperature fluctuates.

[0005] In order to confirm whether a patient is sleeping at night in a hospital or the like and whether or not the patient is awake and leaving the bed and wandering, it is difficult for a nurse or the like to check manually. And time is required.

In the above-described method of monitoring the sleeping state, the method of installing a plurality of pyroelectric infrared sensors and thermopiles horizontally beside the bed with respect to the bedside is cumbersome and costly, and it is difficult for the human body. There is a problem that the human body is erroneously detected by the warmth of the futon even without it.

The present invention has been made in consideration of the above-described problem of the conventional human body detection, and has a bed detection device which can easily detect a human body on a bed with high reliability and at low cost. It is intended to provide such a method.

[0008]

According to a first aspect of the present invention, there is provided a first infrared sensor for detecting infrared rays from a head of a human body on a bed from a predetermined distance above the bed, and the first infrared sensor. A differentiating circuit for differentiating the detection signal, a motion determining circuit for determining the motion of the human body based on the differentiated detection signal, and a second infrared ray for detecting infrared rays from the head of the human body from a predetermined distance above the bed. A sensor, a presence determination circuit that determines the presence of a human body based on an output signal from the second infrared sensor, and a human body presence determination that determines the presence of the human body based on the determination results of the presence determination circuit and the motion determination circuit And a circuit.

According to a third aspect of the present invention, there is provided a first infrared sensor which has an infrared light emitting / receiving section from a predetermined distance above a bed and detects the height of a human body on the bed, and the first infrared sensor. A human body determination circuit that determines the presence of a human body based on the detection signal, a second infrared sensor that detects infrared light from the head of the human body from a predetermined distance above the bed, and an output signal from the second infrared sensor The presence detection circuit includes: a presence determination circuit that determines the presence of a human body based on a human body; and a human body presence determination circuit that determines the presence of a human body based on the determination result of the human body determination circuit and the presence determination circuit.

According to the present invention, a first infrared sensor for detecting infrared rays from the head of a human body on the bed from a predetermined distance above the bed, and a detection signal from the first infrared sensor is differentiated. A differentiating circuit, a motion judging circuit for judging the motion of the human body based on the differentiated detection signal, and a second unit for detecting the height of the human body on the bed which has an infrared emitting / receiving unit from a predetermined distance above the bed. An infrared sensor, a presence determination circuit that determines the presence of a human body based on a detection signal from the second infrared sensor, and a human body presence that determines the presence of the human body based on the determination results of the motion determination circuit and the presence determination circuit And a determination circuit.

According to a thirteenth aspect of the present invention, there is provided an infrared sensor group which is installed a predetermined distance above each bed in each hospital room and detects infrared rays from the human body of the bed, and a detection signal from the infrared sensor group. And a centralized management means for centrally managing the presence status of a human body on a bed in a sickroom via a network by a determination means for determining the presence or absence of a human body and an output signal from the determination means. It is a detection system.

According to a fourteenth aspect of the present invention, a first infrared sensor detects infrared rays from the head of a human body from a predetermined distance above a bed, differentiates the detection signal, and based on the differentiation result, detects the human body. The movement is determined to determine the presence of a human body, and when the differential output signal has not been generated for a predetermined period, it is determined that the human body is absent.
The infrared sensor detects infrared rays from the head of the human body, and if the detection signal is equal to or more than a predetermined value, it is determined that the human body is present.If the detection signal is equal to or less than the predetermined value, it is determined that the human body is absent. This is an on-bed detection method of determining that a human body is absent only when each determination result based on the detection signal of the second infrared sensor is determined to be absent.

According to a fifteenth aspect of the present invention, the height of the human body on the bed is detected by a first infrared sensor having an infrared emitting / receiving section from a predetermined distance above the bed, and when the detection signal is equal to or more than a predetermined value. Is determined to be the presence of a human body, when the detection signal is less than a predetermined value is determined to be absent, from above a predetermined distance of the bed, a second infrared sensor having a thermopile detects infrared light from the head of the human body, When the detection signal is equal to or more than a predetermined value, it is determined that a human body is present. When the detection signal is equal to or less than a predetermined value, it is determined that no human body is present. When at least one determination result based on the first and second infrared sensors is absent, This is a bed detection method for determining absence of a human body.

According to a seventeenth aspect of the present invention, infrared rays from the head of the human body on the bed are detected by a pyroelectric infrared sensor from a predetermined distance above the bed, and the detection signal is differentiated. The movement of the human body is determined to determine the presence of the human body, and when the differential output signal is not generated for a predetermined period, it is determined that the human body is absent. The infrared sensor detects the height of the human body on the bed, and when the detection signal is equal to or higher than a predetermined value, it is determined that the human body is present. When the detection signal is equal to or lower than the predetermined value, it is determined that the human body is absent. And at least one determination result based on the second infrared sensor is absent,
This is a bed detection method of determining that a human body is absent.

For example, a pyroelectric infrared sensor having a divided detection area and a thermopile with room temperature compensation are installed on the ceiling of the bed head to constantly detect the head of a sleeping person on the bed. The movement of the human body is detected by a pyroelectric infrared sensor, the presence of the human body is detected by a thermopile, and the presence / absence of the human body in the bed is determined based on output signals from both. Furthermore, the infrared sensor having such a configuration is installed on the ceiling of each bed in each hospital room, and a signal processing circuit for determining presence / absence is installed inside the ceiling, and presence / absence information output from these signal processing circuits is provided. Is centrally controlled via the Ethernet installed in the hospital, and is displayed for each bed on the monitor screen, so that the sleeping state of the patient can be easily and collectively managed. By doing so, the disadvantages of the conventional method can be eliminated, and an accurate, reliable, low-cost on-bed detection device and its method can be easily obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

According to the present invention, there is provided the above-described bed detection device,
Information on the presence / absence of a sleeping person in a bed in a hospital or the like can be obtained easily and accurately with high reliability. In addition, by installing a pyroelectric infrared sensor and a thermopile on the ceiling and setting the detection area near the head, motion detection and presence detection can be easily performed, making it compact and inexpensive,
An accurate and reliable on-bed detection device can be obtained.
In particular, by dividing the detection area as a pyroelectric infrared sensor, it is possible to detect the movement of the human body, and by performing room temperature compensation on the output of the thermopile, it performs accurate and reliable human detection. be able to.
Further, even if a point type Fresnel lens is used as a pyroelectric infrared sensor, a multi-element type detection area can be formed in a line or matrix, and the sensor can be made compact.

Further, according to the present invention, the presence detection method described above determines that the pyroelectric infrared sensor is absent only when the pyroelectric infrared sensor does not output for a certain period of time and the output of the thermopile is below a certain value. By doing so, an accurate and reliable on-bed detection method can be obtained. Furthermore, by centrally managing sensors and signal processing circuits via Ethernet, and displaying and monitoring presence / absence information in each bed on a centralized control device, it is possible to reduce the size of the device and reduce costs. be able to.

As described above, this apparatus and method for detecting the presence of a person on the floor is very simple in terms of system, and accurate human body detection can be easily performed at low cost by using this sensor system. Therefore, by using the present invention, it is possible to easily and effectively operate the high-reliability / safety-in-bed detection with high accuracy. (Embodiment 1) FIG. 1 is a perspective view of a hospital bed using an on-bed detection device according to a first embodiment of the present invention. In FIG. 1, a sensor 11 composed of a pyroelectric infrared sensor and a thermopile is installed at a position of a ceiling 15 at a certain height from the bed of a bed 13 to detect the vicinity of the head of a sleeping person. 12 is formed. As this pyroelectric infrared sensor, for example, by using a point type to divide the detection area by a Fresnel lens, it is possible to detect the movement of the sleeping person (hereinafter, referred to as fine movement). Also, the presence of a sleeping person can be detected by detecting infrared rays from the head of a human body by using a thermopile.

FIG. 2 is a block diagram showing a signal processing circuit of the occupancy detecting device according to the present embodiment. FIG.
, Infrared rays generated from near the head of the human body are detected by a pyroelectric infrared sensor 21 which is a first infrared sensor,
An output signal emitted from the pyroelectric infrared sensor 21 is differentiated by a differentiating circuit 24, for example, every one second.
Based on the output signal from the differentiating circuit 24, a fine movement of the human body is detected using a first determining circuit 26 which is a motion determining circuit. In addition, the infrared rays generated near the human head
The output signal from the thermopile 22 is amplified by an amplifier circuit 25, and the output signal from the thermistor 23 as a temperature sensor is used to detect the output signal from the amplifier circuit 25. Compensation is performed using a compensation circuit 27, and based on an output signal from the compensation circuit 27, a second determination circuit 2 that is an existence determination circuit
8, the presence of a human body is determined. Further, based on output signals from the first and second determination circuits 26 and 28, for example, a timer 29 and a third determination circuit 30 for 10 minutes or more are used.
Determines the presence of the human body. In this way, by feeding back the output from the thermistor 23 to the output of the thermopile 22 and adding room temperature compensation, it is possible to accurately detect a sleeping person without variation in output with respect to fluctuations in room temperature. Here, the timer 29 and the third determination circuit 30 constitute a human body presence determination circuit.

By doing so, it is possible to detect fine movements of the human body, to perform accurate and reliable human body detection without fluctuations due to room temperature, to make the sensor compact, and to reduce the cost. A floor detecting device can be provided.

Here, it is desirable that the detection area of the pyroelectric infrared sensor and the detection area of the thermopile have the same shape so that infrared rays from the head of the human body on the bed can be detected.

Since these sensors are composed of a point type pyroelectric sensor and a thermopile, they can be made compact and inexpensive to manufacture, and have high reliability and high reliability. It is possible to detect a human body with high accuracy.

As described above, according to the present embodiment, the pyroelectric infrared sensor and the thermopile are installed on the ceiling of the bed head, and the infrared from the head of the sleeping person is detected to detect the human body. The presence of a sleeping person can be easily detected by detecting the slight movement or the presence, and the presence in bed can be detected with high accuracy and high reliability.

In the first embodiment, the point type is used as the pyroelectric infrared sensor. However, a multi-element pyroelectric sensor may be used, and its detection area is divided into a line shape or a matrix shape by a lens. It is possible to detect the slight movement of the human body.

In the first embodiment, the sensor 11 is installed on the ceiling 15. However, the sensor 11 may be installed at another position above the bed head as long as the sensor can detect the presence of the floor. Good. (Embodiment 2) FIG. 3 is a perspective view of a hospital bed using an on-bed detection device according to a second embodiment of the present invention. In FIG. 3, a sensor 31 composed of a pyroelectric infrared sensor and a thermopile is installed at a position of a ceiling 36 at a certain height from the bed of a bed 34. A first detection area 32 of the pyroelectric infrared sensor and a second detection area 33 of the thermopile are formed so that the head of the sleeping person can be detected. Thus, in the presence detection device of the present embodiment,
Although the pyroelectric infrared sensor and the detection area of the thermopile overlap, the size of the detection area is different. By dividing the detection area with a Fresnel lens using a point type as the pyroelectric infrared sensor, it is possible to detect a slight movement of a sleeping person. Also, the presence of a sleeping person can be detected by detecting infrared rays from the head of a human body by using a thermopile.

That is, basically similar to the first embodiment described above, infrared rays generated near the head of a human body are detected by a pyroelectric infrared sensor, and an output signal emitted from this sensor is Differentiation is performed by a differentiating circuit, and based on an output signal from the differentiating circuit, fine movement of a human body is detected using a first determination circuit. Further, infrared rays generated near the head of the human body are detected by a thermopile, and an output signal from the thermopile is amplified using an amplifier circuit. Based on the output signal from the amplifier circuit, the presence of the human body is determined by a second determination circuit. judge. Further, the presence of a human body is determined by the third determination circuit based on the output signals from the first and second determination circuits. In this way, the presence of a sleeping person can be detected.

FIG. 4A is a waveform diagram showing an output obtained from the differentiating circuit of the occupancy detecting device according to the present embodiment.
(B) is a waveform diagram showing an output obtained from the amplifier circuit. As a determination method in the first determination circuit,
As shown in FIG. 4A, when the signal from the differentiating circuit is frequently generated, the person enters the bed, and when the signal is generated several times, it is turned over to determine the slight movement of the human body and determine the presence of the human body.
Further, when the signal is generated several times and no output signal is generated for a certain period, it is determined that the human body is absent.

As shown in FIG. 4 (b), the output from the thermopile rises when the user enters the floor, and the output from the thermopile fluctuates up and down due to turning over. descend. Therefore, as a determination method in the second determination circuit, if the output is equal to or more than a certain value, it is determined that a human body is present, and if the output is equal to or less than a certain value, it is determined that no human body is present.

Further, as a determination method in the third determination circuit, a human body is determined to be absent only when each output signal is determined to be absent based on the output signals from the first and second determination circuits. Otherwise, it is determined that a human body exists.

Therefore, only when the pyroelectric infrared sensor does not output for a certain period of time or more and the output of the thermopile is less than a certain value, it is determined that the thermopile is absent. A detection method can be obtained.

By doing so, it is possible to detect a minute movement of a human body, to perform an accurate and highly reliable human body detection, to provide a floor-bed detecting device which is compact and inexpensive in cost. be able to.

It is desirable that the detection area of the pyroelectric infrared sensor and the detection area of the thermopile overlap each other at a part thereof in such a manner that infrared light from the head of the human body in the bed can be detected.

Since these sensors are composed of a point type pyroelectric sensor and a thermopile, they can be made compact and can be manufactured at low cost.
In addition, it has high reliability and can detect a human body with high accuracy.

As described above, according to this embodiment, the pyroelectric infrared sensor and the thermopile are installed on the ceiling of the head of the bed, and the infrared from the head of the sleeping person is detected to detect the human body. The presence of a sleeping person can be easily detected by detecting the slight movement or the presence, and the presence in bed can be detected with high accuracy and high reliability.

Although the point type is used as the pyroelectric infrared sensor, a multi-element pyroelectric sensor may be used, and the detection area thereof is divided into a line shape or a matrix shape by a lens to detect fine movement of a human body. What can be done. (Embodiment 3) FIG. 5 is a schematic view showing an on-bed detection system according to a third embodiment of the present invention. In FIG.
The sensor 51 is installed on the ceiling of each bed in each room to form an infrared sensor group, and is set using a timer so as to operate only at night, and a signal processing circuit 52 for determining presence / absence inside the ceiling is provided. Install. This signal processing circuit 5
The presence / absence information output from 2 is centrally managed via a network laid in the hospital, for example, Ethernet 53, and is displayed for each bed on a monitor screen of a control device 54 which is a central management means. As the sensor 51 and the signal processing circuit 52 used in the present embodiment, a conventional human body detection device can be used.
It is even better to apply the presence detection device of the embodiment.

As described above, if the sensor 51 and the signal processing circuit 52 are centrally and efficiently managed via the Ethernet 53 and the control device 54 displays and monitors the presence / absence information in each bed, The apparatus can be made compact and the cost can be reduced. In addition, by always displaying the presence / absence information on the control device terminal immediately in real time, the sleeping person can be more efficiently and automatically managed. Also, such a system is very simple and the cost can be reduced. Such an on-bed detection system is very simple in terms of system, and by using this sensor system, it is possible to easily perform a reliable and accurate human body detection and on-bed determination at low cost. Can provide a comfortable hospital. (Embodiment 4) Hereinafter, an on-bed detection device and a method thereof according to a fifth embodiment of the present invention will be described. The configuration and functions of the present embodiment are basically the same as those of the first embodiment.

A pyroelectric infrared sensor and a thermopile are installed on a ceiling at a certain height from the bed of a hospital or the like, and infrared light generated from near the head of the human body is detected by the pyroelectric infrared sensor. The output signal from the infrared sensor is differentiated using a differentiating circuit, and the output signal from the differentiating circuit is determined by a first determination circuit. As a determination method, when the signal from the differentiating circuit is frequently generated, the person enters the bed, and when the signal is generated several times, it is turned over to determine the slight movement of the human body and determine the presence of the human body. Further, when it occurs several times and no output signal is generated for a certain period, it is determined that the human body is absent.

Further, infrared rays generated near the head of the human body are detected by a thermopile, an output signal from the thermopile is amplified by an amplifier circuit, and an output signal from the amplifier circuit is compensated by an output signal from a thermistor. And a second determination circuit determines the presence of a human body based on an output signal from the compensation circuit. As the output from the thermopile, the output from the thermopile rises when the user enters the bed, the output fluctuates up and down due to turning over, and the output rapidly decreases when the user leaves the bed. Therefore, as this determination method, it is determined that a human body is present when the value is equal to or more than a certain value, and it is determined that no human body is present when the value is equal to or less than a certain value.

Further, based on the output signals from the first and second determination circuits, the third determination circuit determines the absence of the human body only when each output signal is determined to be absent.

Therefore, only when the pyroelectric infrared sensor does not output for a certain period of time or more and the output of the thermopile is equal to or less than a certain value, it is determined that the thermopile is absent. A detection method can be obtained.

At this time, the detection area of the pyroelectric infrared sensor and the detection area of the thermopile may be the same so that infrared light from the head of the human body in the bed can be detected.
Some of them may overlap.

As described above, the apparatus and method for detecting the presence of a bed in the present embodiment is very simple in terms of system, and by using this sensor system, it is easy to reduce the cost, and to obtain a highly accurate and accurate system. An in-bed detection can be performed, and an intelligent hospital can be provided. (Embodiment 5) FIG. 6 is a perspective view of a hospital bed using an occupancy detection device according to a sixth embodiment of the present invention. In FIG. 6, a sensor 61 composed of an infrared light emitting / receiving sensor serving as a first infrared sensor and a thermopile serving as a second infrared sensor is provided at a position of a ceiling 65 at a certain distance from the bed of a bed 63. , A detection area 62 for detecting the head of a sleeping person is formed. By using this infrared light emitting / receiving sensor, it is possible to detect the height of a sleeping person's body, and it is possible to detect the presence of a sleeping person by detecting infrared rays from the head of the human body using a thermopile. In this embodiment, the output of the first infrared sensor is input to a human body determination circuit provided in place of the differentiating circuit 24 and the first determination circuit 26 in FIG. Is determined.

In this manner, the presence of a human body can be detected, accurate and reliable detection of the human body can be performed without fluctuations due to room temperature, the sensor can be made compact, and the cost can be reduced. A sensing device can be provided.

It is desirable that the detection area of the infrared light emitting / receiving sensor is the chest of the sleeping person, the detection area of the thermopile is near the head of the human body, and the presence of the human body on the bed is detected.

Since these sensors are composed of a point-type light emitting / receiving sensor and a thermopile, they can be made compact and inexpensive to manufacture, and have high reliability and high accuracy. It is possible to detect a human body in a short time.

As described above, according to the present embodiment, the infrared light emitting / receiving sensor and the thermopile are installed on the ceiling of the head of the bed, and the infrared light from the head of the sleeping person is detected to detect the human body. By detecting the height and the presence, it is possible to easily detect the presence of a sleeping person, and it is possible to perform bed detection with high accuracy and high reliability.

It is also possible to use only a plurality of infrared light emitting / receiving sensors as the first infrared sensor. (Embodiment 7) FIG. 7 is a perspective view of a hospital bed using an on-bed detection device according to a seventh embodiment of the present invention. In FIG. 7, a sensor comprising a pyroelectric infrared sensor serving as a first infrared sensor and an infrared light emitting / receiving sensor serving as a second infrared sensor is provided at a position of a ceiling portion 76 at a certain height from the bed of the bed 74. 71 is installed. A first detection area 72 of the pyroelectric infrared sensor and a second detection area 73 of the infrared light emitting / receiving sensor are formed so as to detect the head of the sleeping person. By dividing the detection area with a Fresnel lens using a point type as this pyroelectric infrared sensor, it is possible to detect the slight movement of a sleeping person, and the infrared light emitting / receiving sensor detects the height of the human body and goes to sleep. The presence of a person can be detected.

An infrared ray generated from the vicinity of the head of a human body is detected by a pyroelectric infrared sensor, and an output signal emitted from the sensor is differentiated by a differentiating circuit. (1) The fine movement of the human body is detected using the determination circuit. Further, the height near the chest of the human body is detected by the light emitting / receiving sensor, and the presence of the human body is determined by the second determination circuit based on the output signal from the light receiving sensor.
Further, the presence of a human body is determined by the third determination circuit based on the output signals from the first and second determination circuits. In this way, the presence of a sleeping person can be detected.

By doing so, it is possible to detect minute movements of the human body, to perform accurate and highly reliable human body detection, to provide a downsized floor detecting device that is compact and inexpensive. be able to.

Since these sensors are composed of a point type pyroelectric sensor and an infrared light emitting / receiving sensor,
It can be made compact and inexpensive to manufacture, and has high reliability and can detect a human body with high accuracy.

As described above, according to the present embodiment, the pyroelectric infrared sensor and the infrared light emitting / receiving sensor are installed on the ceiling of the head of the bed to detect infrared light from the head of the sleeping person. However, by detecting the slight movement or presence of the human body, the presence of a sleeping person can be easily detected, and the presence in bed can be detected with high accuracy and high reliability.

Although the point type is used as the pyroelectric infrared sensor, a multi-element pyroelectric sensor may be used. The detection area of the pyroelectric infrared sensor is divided into a line shape or a matrix shape by a lens to detect a slight movement of a human body. What can be done. (Eighth Embodiment) Hereinafter, an on-bed detection device and a method thereof according to an eighth embodiment of the present invention will be described. The configuration and functions of this embodiment are basically the same as those of the sixth embodiment.

An infrared light emitting / receiving sensor and a thermopile are installed on the ceiling at a certain height from the bed of a hospital or the like, and the height near the chest of the human body is detected by the infrared light emitting / receiving sensor. The output signal from the sensor is
The judgment is made by the judgment circuit. As this determination method, the presence of the human body is determined when the output value from the circuit is equal to or greater than a certain value, and the absence is determined when the output value is equal to or less than a certain value.

Further, infrared rays generated near the head of the human body are detected by a thermopile, an output signal from the thermopile is amplified by an amplifier circuit, and an output signal from the amplifier circuit is compensated by an output signal from a thermistor. And a second determination circuit determines the presence of a human body based on an output signal from the compensation circuit. As the output from the thermopile, the output from the thermopile rises when the user enters the bed, the output fluctuates up and down due to turning over, and the output rapidly decreases when the user leaves the bed. Therefore, as this determination method, the presence of a human body is determined when the value is equal to or more than a certain value, and the absence of the human body is determined when the value is equal to or less than a certain value.

Further, based on the output signals from the first and second determination circuits, the third determination circuit determines the absence of a human body by taking an OR signal of each output signal. That is, when it is determined that the output from one of the sensors is absent, it is determined that the human body is absent.

Therefore, when the infrared light emitting / receiving sensor does not output a certain value or more, or when the output of the thermopile is less than a certain value, it is determined that the sensor is absent. A detection method can be obtained.

At this time, the detection area of the infrared light emitting / receiving sensor is near the chest of the human body, and the detection area of the thermopile may be such that infrared light from the head of the human body in the bed can be detected.

As described above, the apparatus and method for detecting the presence of a bed in the present embodiment is very simple in terms of system, and by using this sensor system, it is easy to reduce the cost and to obtain a highly accurate and accurate An in-bed detection can be performed, and an intelligent hospital can be provided.

As is apparent from the above description, according to the present invention, the presence / absence information of a sleeping person in a bed in a hospital or the like can be easily and accurately obtained with high reliability by using the bed detection device. . In addition, by installing a pyroelectric infrared sensor and a thermopile on the ceiling and setting the detection area near the head, it is possible to easily detect micromotion and presence, and it is possible to reduce the size, cost, and accuracy. Thus, a highly reliable bed detection device can be obtained. In particular, by dividing the detection area as a pyroelectric infrared sensor, it is possible to detect slight motion of the human body, and furthermore, by performing room temperature compensation on the output of the thermopile, accurately and highly reliable human body detection is performed. be able to. Further, even if a point type Fresnel lens is used as a pyroelectric infrared sensor, a multi-element type detection area can be formed in a line or matrix, and the sensor can be made compact.

Further, according to the presence detection method of the present invention, only when the pyroelectric infrared sensor does not output for a certain period of time and when the output of the thermopile is below a certain value, it is determined that the sensor is absent. Thus, an accurate and highly reliable bed detection method can be obtained. Furthermore, by centrally managing sensors and signal processing circuits via Ethernet, and displaying and monitoring presence / absence information in each bed on a centralized control device, it is possible to reduce the size of the device and reduce costs. be able to. Thus, the on-bed detection device and method are very simple in terms of system, and by using this sensor system, accurate human body detection can be easily performed at low cost, and efficient This can greatly contribute to the presence detection. Therefore, by using the present invention, it is possible to easily, highly accurately, highly reliable and safe in-bed detection,
This can greatly contribute to hospitals becoming more intelligent.

[0062]

As is apparent from the above description, the present invention has an advantage that a human body on a bed can be easily detected with high reliability and at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hospital bed using an on-bed detection device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a signal processing circuit according to the first embodiment.

FIG. 3 is a perspective view of a hospital bed using an on-bed detection device according to a second embodiment of the present invention.

4A is a waveform diagram showing an output from a differentiating circuit, and FIG. 4B is a waveform diagram showing an output from an amplifying circuit.

FIG. 5 is a schematic diagram illustrating an on-bed detection system according to a third embodiment of the present invention.

FIG. 6 is a perspective view of an in-hospital bed using an on-bed detection device according to a sixth embodiment of the present invention.

FIG. 7 is a perspective view of a hospital bed using an on-bed detection device according to a seventh embodiment of the present invention.

[Explanation of symbols]

 11, 31, 51, 61 Sensor 12, 62 Detection area 13, 34, 63, 74 Bed 15, 36, 65, 76 Ceiling 21 Pyroelectric infrared sensor 22 Thermopile 23 Thermistor 24 Differentiating circuit 27 Compensation circuit 32, 72 First Detection area 33, 73 Second detection area 52 Signal processing circuit 53 Ethernet 54 Controller

Claims (18)

[Claims] 1. A first infrared sensor for detecting infrared rays from a head of a human body on the bed from a predetermined distance above the bed, a differentiation circuit for differentiating a detection signal from the first infrared sensor, and A motion determination circuit that determines the motion of the human body based on the differentiated detection signal, a second infrared sensor that detects infrared light from the head of the human body from a predetermined distance above the bed, and a second infrared sensor thereof A presence determination circuit that determines the presence of a human body based on an output signal from the human body, and a human body presence determination circuit that determines the presence of the human body based on the determination results of the presence determination circuit and the motion determination circuit. Characterized presence detection device. 2. The on-bed detection device according to claim 1, wherein the first infrared sensor is a pyroelectric infrared sensor, and the second infrared sensor is a thermopile. 3. Infrared light emission from a predetermined distance above the bed.
A first infrared sensor having a light receiving unit and detecting the height of the human body on the bed; a human body determination circuit for determining the presence of a human body based on a detection signal from the first infrared sensor; A second infrared sensor that detects infrared rays from the head of the human body from above the distance, a presence determination circuit that determines the presence of a human body based on an output signal from the second infrared sensor, the human body determination circuit, A human body presence determination circuit for determining the presence of the human body based on the determination result of the presence determination circuit. 4. The on-bed detection device according to claim 3, wherein the second infrared sensor is a thermopile. 5. A temperature sensor for detecting an ambient temperature, and a compensation circuit for temperature-compensating a detection output of the second infrared sensor based on the detected temperature, wherein the presence determination circuit includes the compensation circuit. The presence detection device according to any one of claims 1 to 4, wherein the presence of the human body is determined based on an output signal from the device. 6. The occupancy detection device according to claim 1, wherein the motion determination circuit determines that the human body is absent when the differential output signal has not been generated for a predetermined period. 7. The human body presence determination circuit according to claim 1, wherein
The presence detection device according to any one of claims 1 to 6, wherein it is determined that the human body is absent only when the determination result based on the detection signal of the infrared sensor is determined to be absent. 8. A first infrared sensor for detecting infrared rays from a head of a human body on the bed from a predetermined distance above the bed, a differentiation circuit for differentiating a detection signal from the first infrared sensor, A motion determining circuit that determines a motion of the human body based on the differentiated detection signal; and a second infrared sensor that has an infrared light emitting / receiving section from a predetermined distance above the bed and detects the height of the human body on the bed A presence determination circuit that determines the presence of a human body based on a detection signal from the second infrared sensor; and a human body presence determination that determines the presence of the human body based on the determination results of the motion determination circuit and the presence determination circuit. An on-bed detection device comprising a circuit. 9. The on-bed detection device according to claim 1, wherein a detection area of the first infrared sensor and a detection area of the second infrared sensor are substantially the same. . 10. The presence detection according to claim 1, wherein a detection area of the first infrared sensor and a detection area of the second infrared sensor partially overlap each other. apparatus. 11. The method according to claim 1, wherein the first infrared sensor is a point-type pyroelectric infrared sensor, and a detection area of the pyroelectric infrared sensor is divided into a line shape or a matrix shape by a Fresnel lens. The occupancy detection device according to claim 1 or 8, wherein: 12. The infrared sensor according to claim 1, wherein the first infrared sensor is a multi-element pyroelectric infrared sensor, and a detection area of the pyroelectric infrared sensor is divided into a line shape or a matrix shape by a lens. Claim 1 or 8
The floor presence detection device according to the above. 13. The presence detection device according to claim 3, wherein only a plurality of first infrared sensors are used. 14. An infrared sensor group which is installed a predetermined distance above each bed in each hospital room and detects infrared rays from a human body of the bed, and the presence / absence of a human body based on a detection signal from the infrared sensor group. A determination means for determining absence; and centralized management means for centrally managing, via a network, an output signal from the determination means for a presence state of a human body on a bed in the hospital room. Floor detection system. 15. A first infrared sensor detects infrared rays from the head of a human body from a predetermined distance above a bed, differentiates the detection signal, and determines the motion of the human body based on the differentiation result. Is determined, and when the differential output signal is not generated for a predetermined period, it is determined that the human body is absent, and infrared light from the head of the human body is detected by a second infrared sensor from a predetermined distance above the bed. If the detection signal is equal to or more than a predetermined value, it is determined that a human body is present,
If the value is equal to or less than the predetermined value, it is determined that the human body is absent, and the determination result based on the detection signals of the first and second infrared sensors is determined to be absent only when it is determined that the human body is absent. A floor presence detection method characterized by the following. 16. A first infrared sensor having an infrared emitting / receiving part detects a height of a human body on the bed from a predetermined distance above the bed, and when the detection signal is equal to or more than a predetermined value, the presence of the human body is detected. When the detection signal is equal to or less than the predetermined value, it is determined that the user is absent, and infrared light from the head of the human body is detected by a second infrared sensor having a thermopile from a predetermined distance above the bed, and the detection is performed. When the signal is equal to or greater than a predetermined value, it is determined that a human body is present, and when the detection signal is equal to or less than the predetermined value, it is determined that the human body is absent, and at least one determination result based on the first and second infrared sensors is absent. In this case, a presence detection method characterized by determining that a human body is absent. 17. The determination of presence / absence of a human body using a detection result of a second infrared sensor includes detecting a surrounding temperature with a temperature detection sensor, and based on the detected temperature.
2. The method according to claim 1, wherein the detection result of the second infrared sensor is compensated, and the detection is performed based on the compensated detection result.
17. The floor presence detection method according to 5 or 16. 18. An infrared sensor from a head of a human body on the bed is detected by a pyroelectric infrared sensor from a predetermined distance above the bed, the detection signal is differentiated, and the motion of the human body is determined based on the differentiation result. And determining that the human body is absent, and determining that the human body is absent when the differential output signal is not generated for a preset predetermined period, and from a predetermined distance above the bed, a second infrared sensor having an infrared emission / reception unit. By detecting the height of the human body of the bed, when the detection signal is equal to or greater than a predetermined value, it is determined that a human body is present, and when the detection signal is equal to or less than the predetermined value, it is determined that there is no human body, the first And when at least one of the determination results based on the second infrared sensor is absent, it is determined that the human body is absent.