JP6279407B2 - Human body detection device - Google Patents

Description

  The present invention includes a plurality of thermoelectric elements that receive infrared rays from a detection space formed in a region where a human body is to be detected, and detects the presence or absence of a human body by the amount of infrared energy emitted from a moving body that has entered the detection space. The present invention relates to a human body detection device.

  In recent years, in various buildings such as commercial buildings, public facilities, and apartment buildings, human body detectors using infrared rays emitted from mobile objects have been installed in various places to improve security, and human bodies, etc. in specific monitoring areas There are an increasing number of properties that monitor whether or not a moving object is detected.

  In this type of human body detection device, a pyroelectric infrared detection element (hereinafter abbreviated as a pyroelectric element) is frequently used as a general detection element. The pyroelectric element includes a pyroelectric element that detects a voltage induced by a change in spontaneous polarization in the dielectric (pyroelectric effect) due to a temperature change, and charges are generated by the temperature change of the ferroelectric (eg, PZT). A sensor that uses the pyroelectric effect (pyro effect) that is generated. The infrared rays in the monitoring area are collected by the optical system, and the presence or absence of a human body in the monitoring area according to the amount of change in the energy of the collected infrared rays. Is judged.

  In the pyroelectric element frequently used in this type of human body detection device, when the moving body moves in the direction of arrow A in FIG. 5A and crosses the pair of electrodes, as shown in FIG. 5B. , + Threshold and -threshold outputs are obtained. For this reason, as shown in FIG. 5A, the direction orthogonal to the direction in which the infrared energy in the monitoring area is collected (the direction crossing the detection area in the monitoring area: arrow A in FIG. 5A). ) Exhibits excellent detection ability for moving objects that move to).

  However, when the mobile body enters the direction in which the mobile body goes straight toward the human body detection device (the direction in which the detection area in the monitoring area is vertically traversed: arrow B in FIG. 5A), it particularly corresponds to + of the pyroelectric element. When the moving body enters across the detection area and the detection area corresponding to-, the change in the amount of infrared energy hardly appears, and as shown in FIG. 5C, it becomes a pair of pyroelectric elements. The outputs of ± are canceled out, and it is difficult to output exceeding the + threshold value and the −threshold value. For this reason, it is difficult to distinguish whether the moving body is a human body or a small animal (including a cleaning robot), and it is difficult to detect a human body with high accuracy.

  Further, in this type of human body detection device, by using an optical system such as a lens or a mirror, a plurality of detection areas are dividedly formed in the monitoring region, and infrared rays from each of the divided detection areas are pyroelectric elements. In the detection area on the long distance side that is concentrated as the distance from the apparatus increases, the detection accuracy is not greatly affected if a large heat source such as a human body is a moving body. However, in the detection area on the short distance side close to the human body detection device, there is a particular problem due to misreporting by small animals. That is, in the detection area on the short distance side close to the human body detection device, the closer to the human body detection device, the smaller and denser it becomes, so it becomes difficult to distinguish between a human body and a small animal. For this reason, for example, in a conventional human body detection device using a pyroelectric element disclosed in Patent Document 1 below, monitoring of the detection area on the short distance side is invalidated by an external operation.

JP 2013-44632 A

  By the way, as a detection element for detecting infrared rays radiated from a moving body, a thermopile type infrared detection element (hereinafter abbreviated as a thermopile) as a thermoelectric element is known in addition to the pyroelectric element described above. The thermopile is a thermocouple composed of two kinds of materials, forming a hot junction on the diaphragm, forming a cold junction on the surrounding heat sink, and providing an insulating protective film on the thermocouple, cold junction and hot junction, This is a sensor provided with an absorption film on the hot junction.

  Unlike the pyroelectric elements described above, this thermopile is an element that detects the absolute value of heat rather than capturing the change in heat, so that the moving body in the monitoring area is slow or stationary. However, there is an advantage that the moving body can be detected with high accuracy.

  For this reason, it has been desired to provide a human body detection device that efficiently uses a thermopile (thermoelectric element) by taking advantage of the above-described advantages and solves the problems caused by pyroelectric elements.

  Therefore, the present invention has been made in view of the above problems, and provides a human body detection device that can always detect a human body entering a monitoring area with high accuracy regardless of the distance from the device body. The purpose is that.

In order to achieve the above object, a human body detection device according to claim 1 of the present invention includes a plurality of thermoelectric elements and is formed in a monitoring area set on a monitoring plane as an area for detecting a human body. Forming a plurality of monitoring spaces composed of a plurality of detection spaces corresponding to the thermoelectric elements, and detecting a moving body that has entered the monitoring space from the amount of infrared rays in the detection spaces by the plurality of thermoelectric elements. Body detection means;
Comprising a pyroelectric element of the dual element type, the monitoring predetermined distance from a position directly below the device main body in the region apart is within a short distance range wherein the monitoring the moving body that has entered into the space of the infrared by the pyroelectric element Second moving body detection means for detecting from the amount of energy change ;
A short distance determining means for determining whether or not the moving body has entered the monitoring space within the short distance range according to a detection result of the second moving body detecting means;
A determination space number determination unit that determines a human body determination space number serving as a reference for determining the moving body that has entered the monitoring space as a human body, based on a determination result of the short distance determination unit;
When the number of the detection spaces constituting the monitoring space spanned by the moving body that has entered the monitoring space satisfies the human body determination space number determined by the determination space number determination means, Human body determination means for determining a moving body as a human body and outputting a human body detection signal;
It is provided with.

The human body detection device according to claim 2 is the human body detection device according to claim 1,
The second moving body detection means, before Symbol projected to a short distance determined to be overlapped onto each of the monitoring space formed in a predetermined distance apart within a short distance range from a position directly below the device main body in the surveillance area Forming a space for use, and detecting the moving body that has entered the space for short distance determination from an energy change amount of infrared rays collected from the space for short distance determination toward the pyroelectric element. To do.

  According to the human body detection device of the present invention, the moving body traverses the monitoring area without using the two types of detection means efficiently and invalidating the monitoring of the detection area on the short distance side as in the prior art. Even if the vehicle enters the direction or the longitudinal direction, the moving body is distinguished from the human body and the non-human body (small animals, cleaning robots, etc.) It can be detected with high accuracy.

It is a schematic block diagram which shows the system configuration | structure of the human body detection apparatus which concerns on this invention. It is explanatory drawing which shows the concept of the monitoring area | region, detection area, detection area | region, short distance detection area, and detection space in the human body detection apparatus which concerns on this invention. (A) It is a figure which shows the outline | summary of the detection space condensed on the 1st moving body detection means of the human body detection apparatus based on this invention. (B) It is a figure which shows the outline | summary of the detection space condensed on the 2nd moving body detection means of the human body detection apparatus which concerns on this invention. It is a schematic plan view which shows the example of formation of the detection area of the human body detection apparatus which concerns on this invention. (A) It is a figure which shows the approach direction of the mobile body to the detection area in the human body detection apparatus using a pyroelectric element. (B) It is a figure which shows an example of the output waveform of a pyroelectric element when a moving body moves to the arrow A direction of (a). (C) It is a figure which shows an example of the output waveform of a pyroelectric element when a moving body moves to the arrow B direction of (a).

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment, and all other forms, examples, operation techniques, etc. that can be implemented by those skilled in the art based on this form are included in the scope of the present invention. .

(System configuration)
The human body detection device of this example is installed on the wall surface or ceiling surface of a building to be monitored in order to uniformly monitor the entire monitoring region as a region for detecting a human body. As shown in FIG. 1, the human body detection device 1 of the present example includes a first moving body detection unit 2, a second moving body detection unit 3, a first optical unit 4, a second optical unit 5, a control unit 6, An output means 7 is provided for general configuration.

  First, in describing the configuration of each part of the human body detection device 1 of this example, the monitoring area, detection area, detection area, short-range detection area, and detection space used in this specification will be briefly described with reference to FIG. To do.

  The monitoring area E1 is an area that is virtually set on a monitoring plane (including a substantially horizontal plane or an uneven surface) such as a floor surface in a building or a ground surface outside a building, as indicated by a one-dot chain line in FIG. .

  The detection area E2 has a plurality of elements corresponding to each element of the first moving body detection means 2 formed in a substantially linear shape (including a staggered shape) so as to be seen from the human body detection device 1 with respect to the monitoring area E1. This is a two-dimensional monitoring area (six areas in FIG. 2).

  The detection area E3 corresponds to each element of the first moving body detection means 2, and a plurality of two-dimensional monitoring area detection areas E2 (6 in FIG. 2) formed by the first optical means 4 in the monitoring area E1. One detection area E2) is a region formed as a plurality of sets (two sets in FIG. 2).

  As shown by the broken line in FIG. 2, the short distance detection area E4 is formed by overlapping the second moving body detection means 3 formed so as to surround the detection region E3 within a short distance range close to the position immediately below the human body detection device 1. This is a two-dimensional monitoring area corresponding to each element.

  The detection space E5 collects infrared rays from each detection area E2 of the detection area E3 of the first moving body detection means 2 and the short distance detection area E4 of the second moving body detection means 3 while focusing infrared rays toward the corresponding elements. This is a three-dimensional monitoring area composed of a lighted space. In FIG. 2, only the detection space E5 from one detection area E2 in the detection area E3 of the first moving body detection means 2 is shown by a solid line. Moreover, the detection space E5 from the short distance detection area E4 of the 2nd mobile body detection means 3 is shown with the broken line.

  In the example of FIG. 2, for convenience of explanation, two detection regions E3 each including six detection areas E2 by the first moving body detection unit 2 and detection regions located at a short distance from the human body detection device 1 One short distance detection area E4 by the second moving body detection means 3 formed so as to surround E3 is illustrated.

  In the example of FIG. 2, the monitoring area E1 is formed so as to surround two sets of detection areas E3. However, when three or more sets of detection areas E3 are formed, all these sets of detection areas E3 are set. The surrounding area is set as the monitoring area E1.

  Furthermore, the monitoring area E1 is appropriately set by a person who installs the human body detection device 1 using an adjustment mechanism (not shown) that changes the orientation of the first optical means 4 and the second optical means 5 provided in the housing. Is done.

  Next, the 1st moving body detection means 2, the 2nd moving body detection means 3, the 1st optical means 4, the 2nd optical means 5, the control means 6, and the output means 7 which comprise the human body detection apparatus 1 are demonstrated.

(First moving body detection means 2)
The first moving body detection means 2 includes a plurality of thermoelectric elements, and divides a monitoring space composed of a plurality of detection spaces E5 corresponding to each thermoelectric element into a monitoring area E1 via the first optical means 4. Projecting and detecting the amount of infrared rays emitted from a moving body that has entered the surveillance space. More specifically, the first moving body detection unit 2 includes six thermopiles arranged in parallel, and infrared rays from the detection space E5 of a plurality of detection areas E3 each including six detection areas E2 corresponding to the six thermopiles. The quantity is detected via the first optical means 4 and outputs are obtained from the six thermopiles.

  The first moving body detection means 2 will be described by paying attention to one set of detection areas E3. As shown in FIG. 3A, the first moving body detection means 2 includes detection areas E2 corresponding to each of the six thermopiles formed in the monitoring area. Infrared rays emitted from a moving body that has entered a monitoring space composed of six detection spaces E5 are collected by the first optical means 4, and the collected infrared rays are controlled by a thermoelectric effect as a detection result corresponding to the amount of infrared rays. It outputs to the means 6.

(Second moving body detecting means 3)
The second moving body detection means 3 detects the presence or absence of a moving body that has entered a monitoring space within a short distance range from a position immediately below the main body of the human body detection device 1 among a plurality of monitoring spaces formed in the monitoring area. ing. More specifically, the second moving body detection means 3 includes a one-output pyroelectric element using a dual element method.

  The dual-element pyroelectric element detects false detections due to changes in the background temperature in the area caused by shadows and strong winds in the monitoring area of the building to be monitored, external radio noise, or ambient light such as sunlight. In order to prevent this, a + polar element and a -polar element are arranged in parallel in the horizontal direction, and as shown in FIG. 3B, a + polarity detection space E + by a + polar element and a -polar element are used. The detection space E5 having the -polarity detection space E- is projected onto the monitoring plane via the second optical means 5 as a short distance discrimination space.

  The second moving body detection means 3 projects the short-distance discrimination space by the dual element type pyroelectric element so as to overlap the monitoring space by the detection space E5 of each detection area E2 formed in the short-distance range. A short-distance detection signal based on an infrared energy change amount (temperature change amount) between the background and the mobile object detected when the mobile object enters the short distance determination space is output to the control means 6 as a detection result. .

(First optical means 4)
The 1st optical means 4 is provided corresponding to the 1st moving body detection means 2, and is comprised by the various optical systems which condense infrared rays, such as a lens and a condensing mirror, for example. The first optical means 4 transmits infrared rays from a monitoring space composed of a plurality of detection spaces E5 corresponding to the thermoelectric elements of the first moving body detection means 2 to the corresponding thermoelectric elements (thermopile) of the first moving body detection means 2. Condensed. More specifically, the first optical means 4 is substantially linear with a predetermined interval with respect to the monitoring area E1 shown in FIG. 2 as a set of detection areas E2 corresponding to the number of thermoelectric elements of the first moving body detection means 2. A plurality of sets of detection regions E3 in a shape (including a staggered pattern), and infrared rays from the detection space E5 of each detection area E2 in each set of detection regions E3 are transmitted to corresponding thermoelectric elements of the first moving body detection means 2 It is focused on. Note that the gap between the detection areas E3 of each set is not limited to the moving body to be excluded (for example, a small animal or a cleaning robot), and the lens or mirror of the first optical means 4 is selected according to the size of the moving body to be excluded. It is preset by adjusting the number of divisions and the angle.

(Second optical means 5)
Similar to the first optical means 4, the second optical means 5 is composed of various optical systems that collect infrared rays, such as a lens and a condenser mirror, and is provided corresponding to the second moving body detection means 3. The second optical means 5 emits infrared rays from a monitoring space consisting of a detection space E5 (short distance determination space) corresponding to the pyroelectric elements of the second moving body detecting means 3 to the pyroelectric elements of the second moving body detecting means 3. It is focused on. Explaining further, the second optical means 5 has a short-distance detection area E4 formed so as to surround a detection area E3 located at a short distance from a position immediately below the human body detection device 1 with respect to the monitoring area E1 shown in FIG. Infrared rays from the detection space E5 (short distance determination space) are condensed on the pyroelectric elements of the second moving body detection means 3. The formation position of the short distance determination space can be appropriately adjusted according to the area and angle of the lens and mirror of the second optical means 5.

  Here, FIG. 4 shows an example of forming the detection area E2 in the monitoring area E1. As shown in FIG. 4, when the human body detection device 1 is the center, the detection area E2 by six two-dimensional monitoring areas corresponding to each thermoelectric element of the first moving body detection means 2 is set as a set of detection areas E3. Three sets of detection areas E3 are formed in a straight line with a predetermined gap, and an area surrounding these three sets of detection areas E3 is defined as a monitoring area E1 (a chain line in FIG. 4). Further, the short distance detection area E4 (broken line in FIG. 4) corresponding to the dual element type pyroelectric element of the second moving body detection means 3 surrounds two sets of detection regions E3 located at a short distance from the human body detection device 1. Are formed so as to overlap each other. In FIG. 4, a detection area E <b> 2 in a space where a signal is invalidated during human body detection processing outside the short distance range described later is indicated by a dotted line.

(Control means 6)
The control means 6 is composed of a microcomputer comprising a CPU, ROM, RAM, etc. and its peripheral circuits, and comprehensively controls each means constituting the human body detection device 1, and is executed on the microcomputer and the microcomputer. As the function realizing means realized by the program, a short distance determining means 11, a determination space number determining means 12, and a human body determining means 13 are provided.

  The short distance discriminating means 11 discriminates whether the moving body is detected in the monitoring space within the short distance range or in the monitoring space outside the short distance range based on the detection result from the second moving body detecting means 3. ing. More specifically, when the short distance detection signal is input from the second moving body detection means 3, the short distance determination unit 11 has a short distance detection threshold that exceeds a preset threshold for short distance determination. It is determined that the monitoring space in which the moving body is detected is within the short distance range, and a signal within the short distance range is output to the determination space number determination means 12 as a spatial position determination signal. On the other hand, if the short distance detection signal input from the second moving body detection means 3 does not exceed the short distance determination threshold, the short distance determination means 11 indicates that the monitoring space in which the moving body is detected is outside the short distance range. And the out-of-range signal is output to the determination space number determination means 12 as a spatial position determination signal.

  Based on the determination result from the short distance determination unit 11, the determination space number determination unit 12 selects the moving body from the plurality of detection spaces constituting the monitoring space when the moving body straddles several detection spaces. The number of human body determination spaces is determined as a human body determination threshold value for determining whether to determine.

  Here, the number of human body determination spaces is set as at least two patterns depending on whether or not the monitoring space is within the short distance range. In this example, the number of human body determination spaces based on one of the two patterns is selected and set according to the determination result of the short distance determination means 11. Specifically, when the short distance discriminating means 11 determines that it is within the short distance range, in the monitoring space composed of the six detection spaces by the six-element thermopile, the moving body straddles five or more spaces among the six spaces. The human body determination space number is determined to be “5” so that the mobile body is sometimes determined to be a human body. On the other hand, when the short distance discriminating means 11 determines that it is out of the short distance range, in the monitoring space composed of six detection spaces by the six-element thermopile, the signal processing of any three of the six spaces is invalidated, and the remaining The number of human body determination spaces is determined to be “2” so that the moving body is determined to be a human body when straddling two or more spaces among the three spaces.

  The human body determination means 13 compares the detection signal from the first moving body detection means 2 with a preset threshold value at the determination time, and the number of detection spaces in which a detection signal exceeding the threshold value is detected is determined space number determination means. When the number of human body determination spaces determined in 12 is satisfied, the mobile body that has entered is determined as a human body and a human body detection signal is output. This human body detection signal is output to, for example, an alarm device, a ringing device, an interlocking device such as a monitoring camera built in the human body detection device 1, a monitoring center, or the like. In addition, the threshold value compared with the detection signal from the 1st mobile body detection means 2 is set to a different value, respectively in the near distance range and outside the near distance range.

  More specifically, the human body determination means 13 determines that the short distance determination means 11 is within the short distance range, and the determination space number determination means 12 determines the number of human body determination spaces to be “5”. In the monitoring space composed of detection spaces, the detection signals from the six detection spaces by the first moving body detection means 2 are compared with threshold values at the determination time, and the number of detection spaces in which detection signals exceeding the threshold values are detected is the human body determination space. When the number is “5” or more, the moving body is determined to be a human body. When the human body determination space number of the determination space number determination unit 12 is set to “2”, the human body determination unit 13 uses the first moving body detection unit 2 in a monitoring space composed of six detection spaces using a thermopile of six elements. The signal processing of detection signals from any three of the six detection spaces is invalidated, and the detection signals from the remaining three detection spaces are compared with threshold values at the determination time, and detection signals exceeding the threshold values are detected. When the number of detected spaces is equal to or greater than the human body determination space number “2”, the moving body is determined to be a human body.

(Output means 7)
When the human body determination signal is input from the control unit 6, the output unit 7 is an output device, for example, an alarm device, a ringing device, an interlocking device such as a monitoring camera built in the human body detection device 1, a monitoring center, or the like. ) Is outputting a human body detection signal.

  Next, as an operation of the human body detection device 1 described above, human body detection processing in each of the short distance range and outside the short distance range will be described.

(Human body detection processing within short range)
The second moving body detection means 3 outputs the energy change amount of the infrared light collected from the short distance detection area E4 via the second optical means 5 to the short distance determination means 11 of the control means 6 as a short distance detection signal. . When the short distance detection signal is input from the second moving body detection means 3, the short distance determination unit 11 detects that the monitoring space in which the mobile body is detected is close if the short distance detection signal exceeds the short distance determination threshold. It is determined that it is within the distance range, and a signal within the short distance range is output to the determination space number determination means 12. When the short distance determination unit 11 receives a signal within the short distance range, the determination space number determination unit 12 determines that the mobile body is a human body when the mobile body straddles five or more spaces in the six spaces. The number of human body determination spaces is determined to be “5” so as to be determined. Then, the human body determination means 13 compares the detection signals from the six detection spaces by the first moving body detection means 2 with the threshold values at the determination time, and the number of detection spaces in which the detection signals exceeding the threshold values are detected is the determination space. When “5” or more of the human body determination space number determined by the number determining means 12 is satisfied, the mobile body that has entered is determined to be a human body and a human body detection signal is output to the output means 7. Then, when the human body detection signal is input from the human body determination unit 13, the output unit 7 outputs the human body detection signal to the subsequent device at the output destination, and performs predetermined processing.

(Human body detection processing outside the short range)
The second moving body detection means 3 outputs the amount of change in the infrared energy collected from the short distance detection area via the second optical means 5 to the short distance determination means 11 of the control means 6 as a short distance detection signal. When the short distance detection signal is input from the second moving body detection means 3, the short distance determination means 11 detects that the monitoring space in which the moving body is detected is a short distance unless the short distance detection signal exceeds the short distance determination threshold. It is determined that the signal is out of the range, and a short distance out-of-range signal is output to the determination space number determination unit 12. The determination space number determination means 12 invalidates the signal processing of any three spaces out of the six spaces when a signal outside the short distance range is input from the short distance determination means 11, and two or more spaces in the remaining three spaces The number of human body determination spaces is determined to be “2” so that the moving body is determined to be a human body. Then, the human body determination unit 13 invalidates the signal processing of the detection signals from any three spaces among the six detection spaces by the first moving body detection unit 2, and from the remaining three detection spaces at the determination time. The detection signal and the threshold value are compared, and when the number of detection spaces in which the detection signal exceeding the threshold value is detected satisfies the human body determination space number “2” or more, the moving body that has entered is determined as a human body and a human body detection signal is output. 7 is output. Then, when the human body detection signal is input from the human body determination unit 13, the output unit 7 outputs the human body detection signal to the subsequent device at the output destination, and performs predetermined processing.

  By the way, in the human body detection process described above, the detection signals of all the six thermopiles of the first moving body detecting means 2 are validated when they are within the short distance range, and the first moving body detecting means 2 when they are outside the short distance range. The human body detection is performed by distinguishing the human body and non-human body (small animals, cleaning robots, etc.) by processing the detection signals of any three of the six thermopiles as invalid, but the size of the moving body to be excluded The reverse process may be performed by That is, the thermopile that invalidates the detection signal is set in advance by experiments or the like so as not to detect the moving body to be excluded.

  As described above, in the human body detection device 1 of the present example, the first moving body detection unit 2 including a plurality of thermoelectric elements (in this example, six thermopiles) is used as a human body detection sensor, The second moving body detecting means 3 having a dual element type pyroelectric element is used as a sensor for detecting a moving body that has entered the short distance range from the position immediately below. Then, the second moving body detection means 3 from the short distance discrimination space projected so as to overlap with the monitoring space formed within the short distance range from the position directly below the body of the human body detection device 1 in the monitoring area E1. A moving body that has entered the short-distance discrimination space is detected from the amount of infrared energy change. Then, the short distance determination unit 11 determines whether or not the mobile body has entered the short distance determination space based on the detection result of the second mobile body detection unit 3. The determination space number determination unit 12 determines the human body determination space number based on the determination result of the short distance determination unit 11. Then, the human body determination means 13 compares the detection signal from the detection space by the first moving body detection means 2 with the threshold value at the determination time, and the number of detection spaces in which the detection signal exceeding the threshold value is detected is the number of human body determination spaces. If the condition is satisfied, the moving body is determined to be a human body and a human body detection signal is output from the output means 7.

  As a result, when the moving body enters the direction crossing the detection area E2 in the monitoring area E1 (arrow A in FIG. 5A), the moving body passes through the detection area E2 in the monitoring area E1. Even when the vehicle enters the direction (arrow B in FIG. 5 (a)), it is possible to reliably detect a human body by distinguishing a moving body from a human body and a person other than a human body (small animals, cleaning robots, etc.), and reduce false alarms. Can do. In addition, even within a short distance range close to the human body detection device 1 that has been regarded as a problem in the past, the mobile body can be separated from a human body and a human body (such as a small animal or a cleaning robot) without invalidating monitoring of the detection area on the short distance side. ) To detect human bodies with reduced false alarms. As a result, it is possible to provide a human body detection device that can always detect a human body entering the monitoring area with high accuracy regardless of the distance from the device main body.

  In the above-described embodiment, the first moving body detection unit 2 has been described as a configuration including six thermoelectric elements (thermopiles). However, the number of thermoelectric elements is not limited to six. For example, if the first moving body detection means 2 is configured to include nine thermoelectric elements, and the number of human body determination spaces corresponding to the moving body to be excluded is determined, it is possible to perform highly accurate human body detection.

  In the above-described embodiment, the first moving body detection unit 2 is configured by six thermoelectric elements. However, the first moving body detection unit 2 may be configured by a plurality of detection units having different numbers of elements. For example, if the detection means consisting of four thermoelectric elements and the detection means consisting of two thermoelectric elements are combined, the first moving body detection means 2 using six thermoelectric elements can be configured.

  Furthermore, in the example of FIG. 4, the case where a plurality of sets of detection areas E3 by the first moving body detection means 2 are formed in a single line in the monitoring area is described, but a plurality of sets of detection areas are included in the monitoring area. E3 can be formed in a staggered pattern, or a plurality of rows can be formed in a radial pattern.

  Moreover, since the human body detection apparatus 1 of this example does not require the power supply construction to a wall, the 2nd mobile body detection means 3 assumes that it installs in a general household as a home security sensor which can be battery-driven. Although it demonstrated as a structure provided with the pyroelectric element which is a passive type sensor with low consumption current, it is not limited to this. For example, various active sensors such as ultrasonic waves, microwaves, and near-infrared sensors can be selectively used to obtain drive power from commercial power in the building.

DESCRIPTION OF SYMBOLS 1 Human body detection apparatus 2 1st moving body detection means 3 2nd moving body detection means 4 1st optical means 5 2nd optical means 6 Control means 7 Output means 11 Short-distance discrimination means 12 Determination space number determination means 13 Human body determination means E1 Monitoring area E2 Detection area E3 Detection area E4 Short-range detection area E5 Detection space E ++ Polarity detection space E- Polarity detection space

Claims (2)

Comprising a plurality of thermoelectric elements, a monitoring space comprising a plurality of detection space corresponding to the respective thermoelectric elements are formed toward the monitoring area set on the monitoring plane as a region for detecting a human body form a plurality, the First moving body detection means for detecting a moving body that has entered the monitoring space from the amount of infrared rays in each detection space by a plurality of thermoelectric elements ;
Comprising a pyroelectric element of the dual element type, the monitoring predetermined distance from a position directly below the device main body in the region apart is within a short distance range wherein the monitoring the moving body that has entered into the space of the infrared by the pyroelectric element Second moving body detection means for detecting from the amount of energy change ;
A short distance determining means for determining whether or not the moving body has entered the monitoring space within the short distance range according to a detection result of the second moving body detecting means;
A determination space number determination unit that determines a human body determination space number serving as a reference for determining the moving body that has entered the monitoring space as a human body, based on a determination result of the short distance determination unit;
When the number of the detection spaces constituting the monitoring space spanned by the moving body that has entered the monitoring space satisfies the human body determination space number determined by the determination space number determination means, Human body determination means for determining a moving body as a human body and outputting a human body detection signal;
A human body detection device comprising: The second moving body detection means, before Symbol projected to a short distance determined to be overlapped onto each of the monitoring space formed in a predetermined distance apart within a short distance range from a position directly below the device main body in the surveillance area Forming a space for use, and detecting the moving body that has entered the space for short distance determination from an energy change amount of infrared rays collected from the space for short distance determination toward the pyroelectric element. The human body detection device according to claim 1.

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