JP2013210307A - Human body detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a human body detector capable of detecting a human body with high accuracy even in a detection area arranged at long distance from the human body detector.SOLUTION: Among a plurality of formed detection areas in a monitoring area set on a monitoring plane as an area for detecting a human body, the respective detection areas equivalent to the number of human body determination areas to be formed in a distant area D are targeted, at least a part of the adjacent detection areas are formed so as to be overlapped with each other so that height h in the perpendicular direction between an edge position Q on the device side in the detection area on the nearest side from the human body detector 1 and an upper end R of a condensation space corresponding to the detection area at one before the farthest detection area from the human body detector 1 does not exceed predetermined height H for human body determination in the respective determination areas to be targeted.

Description

  The present invention includes a plurality of pyroelectric elements that receive infrared rays from a detection area formed in a monitoring area that is a target area for detecting a human body, and an amount of infrared energy that has fluctuated due to a moving object that has entered the monitoring area It is related with the human body detection apparatus which detects the presence or absence of a human body by.

  Conventionally, human body detection using infrared rays radiated from an object to detect that a moving object such as a human body has entered a specific surveillance area in various places such as commercial buildings, public facilities, and housing complexes. The device is installed at a predetermined location.

This type of human body detection device includes a pyroelectric element that detects a voltage induced by a change in spontaneous polarization (pyroelectric effect) in a dielectric due to a temperature change as a detection element, and is a ferroelectric (for example, PZT). This is a sensor that uses the pyroelectric effect (pyro effect) that generates electric charges due to temperature changes in the sensor. The infrared rays in the monitoring area are collected by the optical system and monitored according to the amount of change in the energy of the collected infrared rays. The presence or absence of a human body in the area is determined.
In addition, as such a human body detection apparatus, what is disclosed by the following patent document 1, for example is well-known.

Japanese Patent No. 3491270

  By the way, when the general human body detection apparatus including the detector of Patent Document 1 is arranged on the ceiling, the human body detection apparatus is formed on the floor due to the configuration of the optical system that collects infrared rays radiated from within the monitoring region. When the distance to the detection area is relatively short (as an example, the distance from the position immediately below the apparatus main body in the monitoring area on the plane is about 5 to 7 m) and far (as an example on the plane) When the distance from the position directly below the apparatus body is 12 m or more in the monitoring area, the light collection area of the detection area tends to increase as the formation position becomes far.

  Therefore, as a method for detecting a human body that has entered the monitoring area, a method of distinguishing whether the moving object that enters the monitoring area is a human body or a small animal according to how many of the detection areas it has straddled (determined as a human body as an example) In the case of the detection area formed at a long distance from the apparatus main body, the number of areas straddling the human body bent in the area as shown in FIG. Since the number of areas specified by is not reached, there was a risk of false detection as a small animal.

  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 main body of the device. The purpose is that.

In order to achieve the above object, a human body detection device according to claim 1 of the present invention comprises a plurality of infrared detection means for individually detecting infrared rays and outputting signals.
A plurality of detection areas are formed in a monitoring area set on a monitoring plane as an area for detecting a human body, and the infrared rays radiated from the space to each of the detection areas are collected on the corresponding infrared detection means. Light means;
Area determination means for determining the presence or absence of a change in infrared for each of the detection areas based on a signal output from each infrared detection means;
When the number of the detection areas determined to be changed by the area determination means satisfies a preset number of human body determination areas that serve as a reference for determining a human body, the human body is determined and a human body detection signal is output. Human body determination means;
A human body detection device comprising:
The condensing means is adjacent to the monitoring area along the direction away from the position immediately below the detection area formed in a far area farther than a position away from the position directly below the human body detection device by a predetermined distance. The detection area is formed so as to overlap at least a part of the detection area.

The human body detection device according to claim 2 is the human body detection device according to claim 1, wherein each of the detection areas corresponding to the number of human body determination areas among a plurality of detection areas adjacent along a direction away from the position immediately below. In each detection area that is the target, the edge position on the device side in the detection area nearest to the human body detection device and the detection area farthest from the human body detection device are one before this The area in the vertical direction between the detection area and the upper end of the light collection space exceeds the predetermined human body determination height as the far area,
The condensing means overlaps at least a part of the detection areas adjacent to each other along a direction away from the directly below position so that the height in the vertical direction in the far region does not exceed the height for human body determination. The detection area is formed as described above.

  The human body detection device according to claim 3 is the human body detection device according to claim 1 or 2, wherein the detection area has a degree of overlap with the adjacent detection area as the formation position moves away from the human body detection device. It is characterized by gradually increasing.

  According to the human body detection device according to claim 1, among the plurality of detection areas formed in the monitoring region, the human body detection device is formed in a far region farther than a position away from a position directly below the human body detection device by a predetermined distance. Even in the detection area, the human body can be detected with high accuracy without erroneously detecting the human body as a small animal, similarly to the detection area formed in the region closer to the apparatus main body than the far region.

  Further, according to the human body detection device of the third aspect, among the detection areas formed in the distant region, the overlapping degree with the adjacent detection areas gradually increases as the formation position moves away from the apparatus main body. Therefore, it is possible to further reduce the erroneous detection of the human body determination by the detection area formed at a long distance.

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 a schematic perspective view when the apparatus is installed on the ceiling. It is explanatory drawing which shows the concept of the detection area in the same apparatus, a detection area, and the condensing space. (A)-(e) It is explanatory drawing which shows the detection method of the pyroelectric element of a dual element system. It is explanatory drawing which shows the example of formation of the detection area of this example. (A) is the conceptual diagram seen from the side surface when adjusting the superposition position of the detection area formed at a short distance from the apparatus main body, (b) is the light collection space in the one-dot chain line in FIG. 6 (a). (C) is a conceptual diagram viewed from the side when the overlapping position of the detection area formed at a short distance from the apparatus main body is not adjusted, (D) is the schematic sectional drawing which looked at the cut surface of the condensing space in the dashed-dotted line in FIG.6 (c) from the arrow C direction. (A) is the conceptual diagram seen from the side surface when the superposition position of the detection area formed in the middle distance from the apparatus main body is adjusted, (b) is the condensing space in the dashed-dotted line in Fig.7 (a). (C) is a conceptual diagram viewed from the side when the overlapping position of the detection area formed at a medium distance from the apparatus main body is not adjusted, (D) is the schematic sectional drawing which looked at the cut surface of the condensing space in the dashed-dotted line in FIG.7 (c) from the arrow C direction. (A) is the conceptual diagram seen from the side surface when the overlapping position of the detection area formed at a long distance from the apparatus main body is adjusted, and (b) is the condensing space along the one-dot chain line in FIG. 8 (a). (C) is a conceptual diagram viewed from the side when the overlapping position of detection areas formed at a long distance from the apparatus main body is not adjusted, (D) is the schematic sectional drawing which looked at the cut surface of the condensing space in the dashed-dotted line in FIG.8 (c) from the arrow C direction. It is explanatory drawing which shows the processing content of the object detection by a dual element pyroelectric element single-piece | unit. It is a timing chart for demonstrating the human body determination process by the same apparatus. It is explanatory drawing which shows the relationship between the detection area and human body which were formed in the long distance in the conventional human body detection apparatus.

  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. .

[Device configuration]
First, the configuration requirements of the human body detection device 1 of this example will be described with reference to FIGS. As shown in FIG. 1 or FIG. 2, the human body detection device 1 is installed over a wall of a building or on a ceiling, for example, to detect an infrared ray in order to uniformly monitor the entire monitoring region as a region for detecting a human body. The means 11, the light collecting means 12, the signal processing means 13, the control means 14, and the output means 15 are roughly configured. The human body detection device 1 includes these configurations inside a housing in which a cover that transmits infrared rays from a monitoring region and a base for fixing to a wall or a ceiling are combined. In FIG. 2, this casing is omitted.

  In this specification, as shown in FIG. 3, for example, for a monitoring region virtually set on a monitoring plane (including a substantially horizontal surface or an uneven surface) such as a floor surface in a building or a ground surface outside the building. The two-dimensional monitoring area corresponding to each of the pyroelectric elements that are radially formed as seen from the human body detection device 1 is referred to as a “detection area”, and the first pyroelectric element 11a or the second pyroelectric element 11b is A combination or group of detection areas to be formed is referred to as a “detection area”, and is a space (in the figure, a substantially pyramid shape) in which infrared rays are focused from each detection area toward the corresponding pyroelectric element. A certain three-dimensional monitoring area is referred to as a “light collection space”. In the example of FIG. 3, the “detection area” is illustrated as an example, and therefore, the “detection area” and the monitoring area are illustrated as having substantially the same position and size. When a plurality of “detection areas” are formed, the monitoring area is set as an area surrounding the plurality of “detection areas”. The monitoring area is appropriately set by a person who installs the human body detection device 1 using an adjustment mechanism or the like that changes the direction of the light collecting means 12 provided inside the housing.

  In addition, as a human body determination condition in this apparatus, a predetermined number of areas (for example, three) serving as a reference for determining that a moving object that has entered the monitoring area is a human body when straddling the detection area is human body determination. The number of areas is set in advance in the storage means (not shown) of the human body detection device, and a moving object detected over the number of human body determination areas is detected as “human body”, less than the number of human body determination areas. The moving object is distinguished as “small animals (dogs, cats, rabbits, etc.)”. The number of human body determination areas can be arbitrarily set to increase or decrease according to the installation environment of the human body detection device 1 or the like.

<About infrared detection means>
The infrared detecting means 11 includes a first twin pyroelectric element 11a which is a dual twin pyroelectric element having two dual element pyroelectric elements a1 and a2, and a dual twin pyroelectric element having dual element pyroelectric elements b1 and b2. The second pyroelectric element 11b which is an electric element.

  First, a dual element type pyroelectric element employed in the infrared detecting means 11 will be described. The dual element type pyroelectric element prevents false detections due to changes in background temperature in the area caused by shadows and strong winds in the monitoring area to be monitored, external radio noise or ambient light such as sunlight. Therefore, a + polarity element and a -polarity element are arranged in parallel in the horizontal direction, and a + polarity detection area (E +) by a + polarity element and a -polarity detection area by a -polarity element are in the monitoring area. A detection area having (E−) is configured.

  In FIG. 4, when a certain object moves from the detection area (E1 +) to the detection area (E1−) in the detection area formed in the monitoring area, it corresponds to the signal level of the electric signal detected in each area. The output waveform of the detection signal is shown.

  As shown in FIG. 4A, for example, when an object moves from the detection area (E1 +) into the detection area (E1-), the dual element pyroelectric element detects the object as shown in FIG. 4B. By entering the area (E1 +), the amount of infrared energy in the detection area (E1 +) changes to the + side. Next, when the object moves from the detection area (E1 +) to the detection area (E1-), as shown in FIG. 4C, the object has entered the detection area (E1-), thereby detecting the detection area (E1). The amount of infrared energy in-) changes to the-side. In addition, when the object is kept stopped in each area, the waveform is not output because there is no change in infrared energy, and when the moving object leaves the area, the output waveform gradually returns to before the change.

Next, as shown in FIG. 4 (d), the detection signal output to the + side and the detection signal output to the − side output from the dual element pyroelectric element are combined by signal processing by the signal processing means 13. . Then, the combined detection signal is output to the control unit 14, and it is determined that a human body exists in the detection area when the detection signal satisfies a predetermined human body determination condition. Further, since changes in infrared energy such as ambient light and background temperature cancel each other and cancel each other, for example, as shown in FIG.
Note that the human body determination process will be described in detail when the configurations of the area determination unit 14a and the human body determination unit 14b described later are described.

  The first pyroelectric element 11a includes a dual element pyroelectric element a1 which is a dual element type pyroelectric element, and a dual element pyroelectric element a2. The dual element pyroelectric element a1 is connected to first signal processing means 13a for performing predetermined signal processing on an electrical signal indicating the amount of infrared energy change received by the element, and the dual element pyroelectric element a2 is connected to the dual element pyroelectric element a2. The second signal processing means 13b is connected to perform predetermined signal processing on an electrical signal indicating the amount of infrared energy change received by the element.

  The second pyroelectric element 11b includes a dual element pyroelectric element b1 and a dual element pyroelectric element b2, which are dual element type pyroelectric elements. The dual element pyroelectric element b1 is connected to third signal processing means 13c for performing predetermined signal processing on an electrical signal indicating the amount of infrared energy change received by the element, and the dual element pyroelectric element b2 is connected to the dual element pyroelectric element b2. The fourth signal processing means 13d is connected to perform predetermined signal processing on the electrical signal indicating the amount of infrared energy change received by the element.

<About condensing means>
The condensing means 12 (12a, 12b) is composed of various optical systems that condense infrared rays, such as a multi-segment lens and a condensing mirror, and is provided for each of the first and second pyroelectric elements 11a, 11b. . The condensing means 12 forms a plurality of detection areas radially around the present apparatus in the monitoring area, and condenses infrared rays from the detection areas corresponding to the first or second pyroelectric elements 11a and 11b. .

  FIG. 5 is an example of forming a detection area in the monitoring area. As shown in the figure, in this embodiment, when the human body detection device 1 is centered, the detection areas a1 and a2 formed by the first pyroelectric element 11a and the detection areas b1 and b2 formed by the second pyroelectric element 11b are A plurality are formed in the monitoring area. The plurality of detection areas formed by the first pyroelectric element 11a are collectively referred to as a detection area A (solid line in the figure), and the plurality of detection areas formed by the second pyroelectric element 11b are collectively referred to as a detection area B ( (Dotted line in the figure).

  Furthermore, each detection area is formed in a manner such that each detection area is substantially concentric with the monitoring area and away from the position P directly below the apparatus body in order to prevent erroneous detection of the human body in the monitoring area. The detection areas are adjusted to be alternately formed. In forming the detection areas, it is preferable to adjust the interval between the detection areas in accordance with at least the body shape (shoulder width, etc.) of the human body to be monitored.

  Further, the light condensing means 12 has a predetermined distance d from a position P directly below the apparatus main body among a plurality of detection areas formed in the monitoring area (for example, a distance with a small number of human body determination misdetections based on the number of human body determination areas). Each detection area corresponding to the number of human body determination areas formed in the far region D farther away than the position separated by a distance of 2 to 3 m in the direction away from the position P directly below the device main body. In each detection area, the edge position on the device side in the detection area closest to the human body detection device 1 and the upper end of the light collection space from the detection area one before the farthest position from the human body detection device 1 The formation position is adjusted so that at least a part of the target detection area is overlapped so that the vertical height h does not exceed a predetermined human body determination height H. Further, in the figure, a portion where the detection areas overlap is shown as an overlap area O.

Here, referring to FIGS. 6 to 8, in the detection area formed in the far region D, the distance from the apparatus main body side (short distance (about 5 to 7 m), middle distance (about 8 to 11 m), long distance An example of superposition according to (12 m or more) will be described.
In the figure, the light collection space corresponding to the detection area a1 is the light collection space Sa1, the light collection space corresponding to the detection area a2 is the light collection space Sa2, and the light collection space corresponding to the detection area b1 is the light collection space Sb1. A light collection space corresponding to the area b2 is a light collection space Sb2, and a space where any one of the light collection spaces overlaps is an overlap space SO.

  In the figure, the average height from the floor when a human body that may enter the monitoring area stands up is L1, and the human body that may enter the monitoring area has a low posture (for example, The average height from the floor surface in a bent state) is L2, and the human body determination height, which is the reference height for human body determination that is the same height as this L2, is H, which corresponds to the number of human body determination areas In each detection area (for example, a1, a2, b2, etc. if the number of human body determination areas is 3), the edge position Q on the device side in the detection area b2 closest to the human body detection device 1, and the human body detection device The height in the vertical direction between the upper end R of the light condensing space Sa1 in the detection area a1 located one position before the detection area a2 farthest from 1 is defined as h.

(When the distance from the main unit is short)
FIGS. 6A and 6B are examples of position adjustment when the detection area is arranged at a short distance in the far region D, and the detection areas a1, a2, and b2 are targeted as detection areas corresponding to the number of human body determination areas. It is said. As shown in the figure, the human body in the detection area a2 is a light collection space corresponding to the edge position Q on the detection device side and the detection area a1 that is one before the detection area a2 that is farthest from the human body detection device 1. Since the height h in the vertical direction between the upper end R of Sa1 exceeds the height H for human body determination, adjacent detection areas (in the example shown, detection areas a1 and b2) are overlapped, and the height in the vertical direction is overlapped. The overlapping position of the detection areas is adjusted so that the height h is lower than the human body determination height H.

  FIGS. 6C and 6D show a state before the position adjustment of the detection area shown in FIGS. 6A and 6B as a comparative example. Comparing before and after the position adjustment of the detection area, before the position adjustment, when the human body lowered the posture, it was not detected across the number of human body judgment areas, whereas after the position adjustment the human body was lowered posture It can also be seen that the human body straddles the number of human body determination areas.

(If the distance from the main unit is medium)
FIGS. 7A and 7B are examples of position adjustment when the detection area is arranged at a middle distance in the far region D, and the detection areas a1, a2, and b2 are targeted as detection areas corresponding to the number of human body determination areas. It is said. As shown in the figure, the human body in the detection area a2 is a light collection space corresponding to the edge position Q on the detection device side and the detection area a1 that is one before the detection area a2 that is farthest from the human body detection device 1. Since the height h in the vertical direction between the upper end R of Sa1 exceeds the height H for human body determination, adjacent detection areas (in the example shown, detection areas a1 and b2) are overlapped, and the height in the vertical direction is overlapped. The overlapping position of the detection areas is adjusted so that the height h is lower than the human body determination height H.

  FIGS. 7C and 7D show a state before the position adjustment of the detection area shown in FIGS. 7A and 7B as a comparative example. Comparing before and after the position adjustment of the detection area, before the position adjustment, when the human body lowered the posture, it was not detected across the number of human body judgment areas, whereas after the position adjustment the human body was lowered posture It can also be seen that the human body straddles the number of human body determination areas.

(If the distance from the main unit is long)
FIGS. 8A and 8B are examples of position adjustment when the detection area is arranged at a long distance in the far region D, and the detection areas a1, a2, and b2 are targeted as detection areas corresponding to the number of human body determination areas. It is said. As shown in the figure, the human body in the detection area a2 is a light collection space corresponding to the edge position Q on the detection device side and the detection area a1 that is one before the detection area a2 that is farthest from the human body detection device 1. Since the height h in the vertical direction between the upper end R of Sa1 exceeds the height H for human body determination, adjacent detection areas (in the example shown, detection areas a1 and b2) are overlapped, and the height in the vertical direction is overlapped. The overlapping position of the detection areas is adjusted so that the height h is lower than the human body determination height H.

  8C and 8D show a state before the position adjustment of the detection area shown in FIGS. 8A and 8B as a comparative example. Comparing before and after the position adjustment of the detection area, before the position adjustment, when the human body lowered the posture, it was not detected across the number of human body judgment areas, whereas after the position adjustment the human body was lowered posture It can also be seen that the human body straddles the number of human body determination areas.

  Also, as shown in FIGS. 6 to 8, in order to prevent erroneous detection of human body determination by the detection area formed in the far region D, as the detection area formation position moves away from the apparatus main body side, adjacent detection areas The degree of overlap is gradually increased.

In this example, the human body determination height H is defined as the same height as L2, but the height obtained by increasing or decreasing the allowable height α according to the use environment is appropriately set as the human body determination height H. May be.
Moreover, the adjustment mentioned above provides the adjustment means in the condensing means 12 which can move the position of a detection area along the direction away from the direct position P of the apparatus main body, and the installation person of the human body detection apparatus 1 etc. It is good also as adjusting by operating an adjustment means, and it is good also as designing the condensing means 12 previously so that it may overlap as mentioned above.

  Furthermore, the condensing means 12 is a shield for providing a first pyroelectric element condensing region and a second pyroelectric element condensing region for condensing each element by limiting the optical path of the condensed infrared light. A member 12c is provided.

<Signal processing means>
The signal processing means 13 (13a, 13b, 13c, 13d) is an electric signal indicating the amount of change in the energy of the infrared rays received by each of the dual element pyroelectric elements a1, a2, b1, b2 (a positive output electric signal and a negative output electric signal). Electric signal) is amplified, a detection signal corresponding to the signal level is generated, and is output to the control means 14 as a detection signal for each element. The signal amplification factors in the signal processing units 13a to 13d are all set to be the same.

<About control means>
The control unit 14 includes a microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof, and performs drive control of each unit constituting the human body detection device 1. Moreover, the control means 14 is provided with the area determination means 14a and the human body determination means 14b as a function module implement | achieved by this microcomputer and the computer program run on a microcomputer.

  The control means 14 has a time measuring function for measuring a predetermined determination time T1 and a holding time T2 used in the determination processing in the area determination means 14a and the human body determination means 14b, and predetermined timing timing such as signal input timing. In accordance with the above, the preset timing is started and stopped.

  The area determination unit 14a is provided so as to correspond to each of the signal processing units 13a to 13d, and independently inputs the detection signals from the signal processing units 13a to 13d, and an object is detected in the corresponding detection area by this detection signal. It is determined whether or not it has been detected (whether there is a change in infrared rays), and when there is a signal of a predetermined level within a preset determination time T1, an object is present in the detection area (changes to infrared rays) The detection signal is validated and the object detection signal is output to the human body determination means 14b. As shown in FIG. 1, in this embodiment, four area determination means 14a (area determination means a1, area determination means a2, area determination means b1) corresponding to each of the dual element pyroelectric elements a1, a2, b1, and b2. , Area determination means b2) is provided.

  Here, the object detection determination process in the detection area by the area determination unit 14a will be described. In FIG. 9, when an object with a change in infrared energy passes from the + polarity area side to the −polarity area side in the detection area, the + threshold value and the −threshold value are exceeded within the determination time T1 (for example, 3 sec). The level state of the detection signal is shown.

  When the detection signal indicating that the signal level has exceeded the −threshold value within the determination time T <b> 1 after the signal level exceeds the + threshold value as illustrated in FIG. 9 is input from the signal processing unit 13, the area determination unit 14 a It is determined that an object exists in the corresponding detection area, and this detection signal is validated and an object detection signal is output to the human body determination means 14b.

  When the detection signal does not exceed the + threshold value and the −threshold value within the determination time T1, the detection signal is determined to be invalid, the time count of the determination time T1 is reset, and the detection signal is input again to the + threshold value or the −threshold value. When the time exceeds, determination of the determination time T1 is started.

  When the object detection signal is input from the area determination unit 14a, the human body determination unit 14b holds this signal for a predetermined holding time T2 (for example, 1 sec). Then, the human body determination unit 14b receives an object detection signal corresponding to the number obtained by subtracting 1 from the number of human body determination areas from the other detection areas during the holding time T2, and enters the detection area. Is a human body (AND condition is established), and a human body determination signal indicating the determination result is output to the output means 15.

Here, the human body determination process by the human body determination unit 14b will be described.
As shown in FIG. 9, first, when the object detection signal is input from the area determination unit 14a, the human body determination unit 14b starts to measure the holding time T2 at this input timing, and receives the object detection signal held only for the holding time T2. Valid signal.

  Next, when the human body determination means 14b inputs the object detection signal by the number obtained by subtracting 1 from the number of human body determination areas from the other detection areas during the holding time T2, the intruding object is a human body. The human body detection signal that is the determination result is output to the output means 15.

  That is, as shown in FIG. 10, the human body determination unit 14b detects the object from the dual element pyroelectric elements b1 and b2 during the holding time T2 of the object detection signal input for the second time from the dual element pyroelectric element a2. When the signal is input, three object detection signals corresponding to the number of human body determination areas are input. Therefore, it is determined that the detected object is a human body, and the human body determination signal as the determination result is output. Is output.

  It should be noted that the human body determination unit 14b holds the input object detection signal for the holding time T2, and when no object detection signal corresponding to the number of human body determination areas is input, the human body detection is not established, so the holding time T2 The object detection signal held after the lapse is deleted.

<About output means>
When the human body determination signal output from the control unit 14 is input to the output unit 15, the output device 15 is a later linked device (for example, an alarm device (not shown), a ringing device, a surveillance camera built in the human body detection device 1). Etc.), a human body detection signal is output.

[Processing operation]
Next, a series of operation examples related to the human body detection process of the human body detection device 1 described above will be described.

  First, when the installer of the human body detection device 1 adjusts the detection areas so as to overlap each other by operating the adjusting means, the installer corresponds to the number of human body determination areas formed in the far region D within the monitoring region. In each detection area (for example, if the number of human body determination areas is 3, a1, a2, b2, etc.), the edge position Q on the device side in the detection area b2 closest to the human body detection device 1, and the human body detection device 1 The height h in the vertical direction from the upper end R of the light condensing space Sa1 corresponding to the detection area a1 one before the farthest detection area a2 from the distance exceeds a predetermined height H for human body determination The adjustment position is adjusted by the adjusting means so that at least a part of the target detection area is overlapped. Note that this operation is not necessary when the formation position is adjusted according to the design of the light collecting means 12.

  Then, the infrared rays collected from the detection area formed in the monitoring area are collected on the infrared detection means 11, and a detection signal indicating the amount of energy change of the infrared rays is output to the area determination means 14a. The area determination unit 14a determines whether or not the signal level of the detection signal exceeds the + threshold value or the −threshold value, and starts measuring the determination time T1 at a timing when the input detection signal exceeds any threshold value. . Next, it is determined whether or not the input detection signal exceeds the other threshold value within the determination time T1, and if the detection signal exceeds the other threshold value, it is detected that the object is detected by the element from which the detection signal is output. An object detection signal indicating this is output to the human body determination means 14b.

  The human body determination unit 14b holds this signal for the holding time T2 from the input timing of the object detection signal. When an object detection signal corresponding to the number obtained by subtracting 1 from the number of human body determination areas is input from another detection area during the holding time T2, it is determined that the object detected in the monitoring area is a human body. A human body determination signal indicating this is output to the output means 15. And the output means 15 will output a human body detection signal with respect to an interlocking apparatus of a back | latter stage, if the human body determination signal from the human body determination means 14b is input.

  As described above, the human body detection device 1 described above includes the infrared detection means 11 including the dual twin type first pyroelectric element 11a and the second pyroelectric element 11b, and is formed in a plurality of areas formed in the monitoring area. In the detection areas corresponding to the number of human body determination areas formed in the far region D far from the predetermined distance d from the position P directly below the device main body, the detection area in the foremost detection area from the human body detection device 1 The height h in the vertical direction between the edge position on the apparatus side and the upper end of the light collection space corresponding to the detection area one before the farthest position from the human body detection device 1 is for a predetermined human body determination. The formation position is adjusted so that at least a part of the target detection area is overlapped so as not to exceed the height H.

  And the area determination means 14a makes the detection signal based on the variation | change_quantity of the infrared energy condensed from the some detection area formed in the monitoring area | region independently from each dual element pyroelectric element a1, a2, b1, b2. An object detection signal indicating that the signal level of the input detection signal exceeds the + threshold value and the −threshold value during the predetermined determination time T1 is output to the human body determination unit 14b. The human body determination unit 14b holds the holding time T2 from the input timing of the object detection signal, and during this holding time T2, the object detection signal detected in another detection area is the number obtained by subtracting 1 from the number of human body determination areas. When input, the object detected in the monitoring area is determined as a human body.

  Thereby, even if the detection area is formed in a distant area D farther than a position separated by a predetermined distance d from the position P directly below the human body detection device among a plurality of detection areas formed in the monitoring area, Like the detection area formed on the apparatus main body side from the region D, the human body can be detected with high accuracy without erroneously detecting the human body as a small animal.

  In addition, among the detection areas formed in the remote area D, the distance between the detection area and the adjacent detection area is gradually adjusted so as to increase as the formation position moves away from the apparatus main body. It is possible to further reduce the erroneous detection of the human body determination by the formed detection area.

DESCRIPTION OF SYMBOLS 1 ... Human body detection apparatus 11 ... Infrared detection means (11a ... 1st pyroelectric element (dual element pyroelectric element a1, a2), 11b ... 2nd pyroelectric element (dual element pyroelectric element b1, b2))
12 ... Condensing mirror (12a ... 1st condensing mirror, 12b ... 2nd condensing mirror, 12c ... shielding member)
13 ... Signal processing means (13a ... 1st signal processing means, 13b ... 2nd signal processing means, 13c ... 3rd signal processing means, 13d ... 4th signal processing means)
14 ... Control means (14a ... Area determination means, 14b ... Human body determination means)
DESCRIPTION OF SYMBOLS 15 ... Output means A, B ... Detection area a1, a2, b1, b2 ... Detection area D ... Distant area O ... Overlapping area P ... Directly below position Q ... End edge position R ... Upper end Sa1, Sa2, Sb1, Sb2 ... Condensing Space SO ... overlapping space

In order to achieve the above object, a human body detection device according to claim 1 of the present invention comprises a plurality of infrared detection means for individually detecting infrared rays and outputting signals.
A plurality of detection areas are formed in a monitoring area set on a monitoring plane as an area for detecting a human body, and infrared rays radiated from a light collection space to each of the detection areas are condensed on the corresponding infrared detection means. Condensing means for causing
Area determination means for determining the presence or absence of a change in infrared for each of the detection areas based on a signal output from each infrared detection means;
When the number of the detection areas determined to be changed by the area determination means satisfies a preset number of human body determination areas that serve as a reference for determining a human body, the human body is determined and a human body detection signal is output. Human body determination means;
A human body detection device comprising:
The condensing means is adjacent to the monitoring area along the direction away from the position immediately below the detection area formed in a far area farther than a position away from the position directly below the human body detection device by a predetermined distance. The detection area is formed so as to overlap at least a part of the detection area.

Claims (3)

A plurality of infrared detecting means for individually detecting infrared rays and outputting signals;
A plurality of detection areas are formed in a monitoring area set on a monitoring plane as an area for detecting a human body, and the infrared rays radiated from the space to each of the detection areas are collected on the corresponding infrared detection means. Light means;
Area determination means for determining the presence or absence of a change in infrared for each of the detection areas based on a signal output from each infrared detection means;
When the number of the detection areas determined to be changed by the area determination means satisfies a preset number of human body determination areas that serve as a reference for determining a human body, the human body is determined and a human body detection signal is output. Human body determination means;
A human body detection device comprising:
The condensing means is adjacent to the monitoring area along the direction away from the position immediately below the detection area formed in a far area farther than a position away from the position directly below the human body detection device by a predetermined distance. The human body detection device, wherein the detection area is formed so as to overlap at least a part of the detection area. The detection areas corresponding to the number of human body determination areas among a plurality of detection areas adjacent along the direction away from the position immediately below are targeted, and detection is performed on the forefront side from the human body detection device in each target detection area. The height in the vertical direction between the edge position on the device side in the area and the upper end of the light collection space in the detection area one before the detection area farthest from the human body detection device is a predetermined human body The area that exceeds the height for determination is the far area,
The condensing means overlaps at least a part of the detection areas adjacent to each other along a direction away from the directly below position so that the height in the vertical direction in the far region does not exceed the height for human body determination. The human body detection device according to claim 1, wherein the detection area is formed as described above. The human body detection device according to claim 1, wherein the detection area gradually increases the degree of overlap with the adjacent detection area as the formation position moves away from the human body detection device.

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