Human detection sensor device

Abstract

Provided is a human detection sensor device that can ensure the accuracy of human detection while reducing false detections caused by small animals and the like. This human detection sensor device is mounted at a position higher than a ground surface or a floor surface, and detects a human entering a specific detection area. The human detection sensor device comprises: three or more infrared sensors for respectively and independently detecting the amounts of variation in infrared rays incident thereon; an optical mechanism for defining a unit zone, which is an angle range of the infrared ray incident on each infrared sensor; and a determination mechanism for outputting a human detection signal indicating detection of a human on the basis of the amounts of variation in the incident infrared rays detected by the infrared sensors. The optical mechanism forms unit areas each including one unit zone for each infrared sensor arranged in the up-down direction, and forms a detection area so that the detection area includes the plurality of unit areas arranged in the up-down direction. The determination mechanism is configured to output a human detection signal upon determining that all the amounts of variation in the incident infrared rays detected by the respective infrared sensors are greater than a predetermined level.

Description

Human detection sensor device

[0001] The present invention relates to a human detection sensor device.

[0002] Conventionally, there has been a human detection sensor device that is installed at a position higher than the ground or floor surface and detects a person entering a predetermined detection area, which includes two infrared sensors and detects a person when an object simultaneously crosses both unit zones of the two infrared sensors (Patent Document 1). Here, a unit zone refers to the angular range of infrared light incident on the infrared sensor.

[0003] By performing AND detection using two infrared sensors in this way, it is possible to reduce false alarms caused by, for example, a small animal entering a specified area compared to when detecting a person using a single infrared sensor.

[0004] Patent Publication No. 2021-071746

[0005] However, even when AND detection is performed using two infrared sensors, there are cases where a small animal or the like crosses both unit zones of the two infrared sensors at the same time, resulting in a false alarm, as shown in Figure 7. One possible solution is to increase the gap between each unit zone to prevent false detection of small animals or the like, but this would reduce the density of the unit zones of the infrared sensors in the detection area, reducing the accuracy of human detection.

[0006] Therefore, the present invention has been made to solve the above problem, and its main objective is to provide a human detection sensor device that can ensure the accuracy of human detection while reducing false alarms caused by small animals, etc.

[0007] The present invention has the following configuration.

[0008] [1] A human detection sensor device that is mounted at a position higher than the ground or floor and detects people who enter a specified detection area, comprising: three or more infrared sensors that each independently detect a fluctuation amount of incident infrared rays; an optical mechanism that defines a unit zone, which is the angular range of infrared rays incident on the infrared sensors; and a judgment mechanism that outputs a human detection signal indicating that a person has been detected based on the fluctuation amount of incident infrared rays detected by the infrared sensors, wherein the optical mechanism forms unit areas in which the unit zones of each infrared sensor are lined up one above the other, and the detection area is formed by multiple unit areas lined up one above the other, and the judgment mechanism outputs the human detection signal when it determines that the fluctuation amounts of incident infrared rays detected by each infrared sensor have all exceeded a specified level.

[0009] A human detection device configured in this way is equipped with three or more infrared detection sensors, and determines that a human has been detected when all of these infrared sensors respond, thereby reducing false alarms caused by small animals, etc. Furthermore, because a human detection signal is not output simply because an object interferes with two unit zones, the gap between the unit zones of each infrared sensor can be narrowed, ensuring human detection accuracy.

[0010] [2] The human detection sensor device according to [1], wherein the infrared sensor has a structure in which two PIR elements are connected in series with opposite polarity, and a total of three infrared sensors are used, using a quad-type device in which two infrared sensors are arranged side by side in one casing, and a dual-type device in which one infrared sensor is arranged in one casing. With this configuration, three infrared sensors can be prepared in two devices, which reduces costs and size compared to a configuration using three devices.

[0011] [3] The human detection sensor device according to [2], wherein the unit area is formed so that a unit zone of a dual-type infrared sensor is located between unit zones of two infrared sensors of the quad-type. With this configuration, the gap between the two unit zones of the quad-type device can be filled with the unit zone of the dual-type device, thereby increasing the density of the detection area and ensuring human detection accuracy.

[0012] [4] The human detection sensor device according to [1], wherein three infrared sensors are used, and the arrangement order of the unit zones within the unit area is different between the unit area for long-distance detection located at the top and the unit area for short-distance detection located at the bottom. With this configuration, it is possible to more easily secure the area in each unit area necessary for human detection and non-detection of small animals, etc., than when the arrangement order of the unit zones in each unit area is the same at both short and long distances of the detection area.

[0013] [5] The human detection sensor device according to [1], wherein a first level and a lower second level are set as the predetermined levels, and the determination mechanism outputs the human detection signal when it determines that a certain number of the incident infrared fluctuation amounts detected by each infrared sensor exceed the first level and the remainder exceed the second level. With this configuration, the first level and the second level, which have different values, are set as the predetermined levels, and the degree of freedom in setting the magnitude of the reference values ​​of these two levels and which infrared sensors are set to which level is increased, so that the device can be flexibly adapted to the installation location of the human detection sensor device, thereby making it possible to meet the required human detection accuracy while suppressing false alarms.

[0014] [6] The human detection sensor device according to [1] is configured such that, in the detection area, an object exceeding a certain height interferes with the unit zone of each of the infrared sensors, and an object below the certain height and within a predetermined size in a planar view interferes with only the unit zone of some of the infrared sensors, or does not interfere with the unit zone of any of the infrared sensors. In such a configuration, for example, by setting the certain height to match the height of a person and setting the predetermined size to be larger than the body length of a small animal that is not to be detected, a person will interfere with all of the unit zones of the multiple infrared sensors in the detection area, but a small animal will not interfere with all of the unit zones, thereby reducing false alarms due to small animals, etc., while ensuring the accuracy of human detection.

[0015] According to the present invention configured in this manner, it is possible to reduce false alarms caused by small animals and the like while ensuring the accuracy of human detection.

[0016] Fig. 1 is an overall schematic diagram of a human detection sensor device according to an embodiment of the present invention; Fig. 2 is a functional block diagram of the human detection sensor device in the same embodiment; Fig. 3 is a front view of the human detection sensor device in the same embodiment; Fig. 4 is a side view of the human detection sensor device in the same embodiment; Fig. 5 is an enlarged top view of a lens of the human detection sensor device in the same embodiment; Fig. 6 is an explanatory diagram of a detection area of ​​the human detection sensor device in the same embodiment; Fig. 7 is an explanatory diagram of a detection area of ​​a conventional human detection sensor device;

[0017] A first embodiment of a heat exchanger according to the present invention will be described below with reference to the drawings.

[0018] [First embodiment] 1. Overall configuration As shown in FIG. 1 , the human detection sensor device 100 of this embodiment is attached at a position higher than the ground or floor, and detects a human who enters a predetermined detection area X.

[0019] This human detection sensor device 100 comprises three infrared sensors 1, each of which independently detects the amount of fluctuation in incident infrared light, an optical mechanism 2 that forms a predetermined detection area X, a judgment mechanism 3 that outputs a human detection signal indicating that a human has been detected based on the amount of fluctuation in incident infrared light detected by the infrared sensors 1, and a housing 4 that houses the infrared sensors 1, optical mechanism 2, and judgment mechanism 3.

[0020] The housing 4 has a vertically long, approximately rectangular prism shape, and its back or top is attached to a wall, pillar, ceiling, etc. so that its front surface faces the predetermined detection area X. The housing 4 is attached, for example, at a height of about 2 to 6 m from the ground or floor.

[0021] The detection area X is formed by a plurality of unit areas Y, and each unit area Y is formed by combining a plurality of unit zones.

[0022] 2. Device Configuration 2-1. Infrared Sensor 1 Infrared sensor 1 detects the amount of fluctuation in incident infrared light and emits an output signal indicating that amount of fluctuation. Infrared sensor 1 has a structure in which two PIR elements are connected in series with opposite polarity. As shown in Figures 3 and 4, the PIR elements in this embodiment are pyroelectric elements P, and are configured so that even if infrared light hits two pyroelectric elements P connected in series with opposite polarity at the same time, their outputs are canceled out.

[0023] The human detection sensor device 100 of this embodiment is provided with three infrared sensors 1, one of which, infrared sensor 1a, is provided within a sensor casing D1 of a dual-type device D, and the remaining two infrared sensors 1b and 1c are provided side by side within a sensor casing Q1 of a quad-type device Q.

[0024] The two pyroelectric elements P of the dual-type device D are arranged adjacent to each other on the left and right. The quad-type device Q has four pyroelectric elements P, which are arranged in a matrix, with two adjacent pyroelectric elements P connected in series with opposite polarity to form one infrared sensor 1. In this way, the quad-type device Q is provided with two infrared sensors 1b and 1c, with the infrared sensor 1b being arranged above the infrared sensor 1c. The two infrared sensors 1b and 1c detect infrared rays independently of each other.

[0025] 3, the dual-type device D and the quad-type device Q are attached to the inner wall of the housing 4 so as to be adjacent to each other on the left and right at the same height. The infrared sensors 1 of each device D, Q are arranged so that the pyroelectric elements P face obliquely downward and forward at approximately the same angle in a side view.

[0026] 2-2. Optical Mechanism 2 The optical mechanism 2 forms a predetermined detection area X, and as shown in Figures 3 and 4, covers part of the front surface and part of the bottom surface of the housing 4 and has a plurality of lenses 21 arranged to face the pyroelectric element P of the infrared sensor 1. Note that Figure 4 is a cross-sectional view taken along the line K-K' of the human detection sensor device 100 in Figure 3.

[0027] The lenses 21 focus infrared light from within the detection area X and allow it to enter each infrared sensor 1. As shown in Fig. 5, the multiple lenses 21 are arranged in two vertical rows, divided into left and right, when viewed from the front. To distinguish between the lenses 21, the lens on the left side (hereinafter also referred to as the left lens) is labeled (L), the lens on the right side (hereinafter also referred to as the right lens) is labeled (R), and the lenses arranged vertically are labeled (1), (2), (3), ... from top to bottom. For example, the lens arranged at the top on the left side is represented as lens 21 (L1).

[0028] The left lens 21(L) is disposed in front of the dual-type device D so as to focus infrared light on the infrared sensor 1a. The right lens 21(R) is disposed in front of the quad-type device Q so as to focus infrared light on the infrared sensors 1b and 1c.

[0029] The lenses 21 in this embodiment are Fresnel lenses, and each Fresnel lens is connected to other Fresnel lenses adjacent to it above and below.

[0030] The number of left lenses 21(L) and the number of right lenses 21(R) are configured to be the same, and in this embodiment, five lenses 21 are arranged on each side, one above the other.

[0031] The five left lenses 21 (L1) to 21 (L5) and the five right lenses 21 (R1) to 21 (R5) are arranged vertically so that each lens is adjacent to the other on the left and right. For example, the top left lens 21 (L1) and the top right lens 21 (R1) are adjacent to each other on the left and right.

[0032] In addition, a shielding member 22 is provided between the adjacent left lens 21 (L) and right lens 21 (R). In this embodiment, the plate-shaped shielding member 22 is provided on the inner wall of the housing 4, and is configured to prevent, for example, infrared rays that pass through the left lens 21 (L1) from entering the infrared sensor 1b or 1c.

[0033] 2-3. Determination Mechanism 3 As shown in FIG. 2, the determination mechanism 3 outputs a human detection signal indicating that a human has been detected when it determines that the fluctuation amounts of the incident infrared rays detected by each infrared sensor 1 all exceed a predetermined level.

[0034] More specifically, the judgment mechanism 3 receives output signals from the three infrared sensors 1 and compares the amount of fluctuation in the incident infrared light indicated by each output signal with a predetermined level, and outputs a human detection signal when the amount of fluctuation in the incident infrared light detected at approximately the same time by the three infrared sensors 1a to 1c all exceeds the predetermined level.

[0035] The determination mechanism 3 includes, for example, an analog circuit including a comparator, an AD converter, and a digital electric circuit such as a computer or PLD.

[0036] 3. Detection Area X The detection area X of the human detection sensor device 100 is formed by the optical mechanism 2. As shown in Fig. 6, the detection area X is formed so that a plurality of unit areas Y are arranged vertically in a side view, and each unit area Y is configured to be formed by combining a plurality of unit zones.

[0037] 4, a unit zone is an angular range of infrared light that passes through the lens 21 and enters the infrared sensor 1, and is defined by the focal length of the lens 21. The unit zones of the three infrared sensors 1 in this embodiment extend toward the ground or floor.

[0038] Each infrared sensor 1 is configured so that infrared rays are incident from a plurality of different angular ranges, and a plurality of unit zones are formed for each infrared sensor 1. In the detection area X, in the gaps between the plurality of unit zones of one infrared sensor 1, unit zones of other infrared sensors 1 are arranged, as shown in Fig. 6, so that unit zones of the same infrared sensor 1 are not adjacent to each other.

[0039] In this embodiment, five unit zones A1 to A5 of the infrared sensor 1a are defined corresponding to the five left lenses 21 (L1) to 21 (L5), as shown in Figure 6. Five unit zones B1 to B5 of the infrared sensor 1b and five unit zones C1 to C5 of the infrared sensor 1c are defined corresponding to the five right lenses 21 (R1) to 21 (R5).

[0040] The multiple unit zones of each infrared sensor 1 are arranged vertically so as not to overlap one another in a side view. In this case, each lens is configured so that the inclination of the unit zone corresponding to the upper lens 21 with respect to the ground is gentler than the inclination of the unit zone corresponding to the lower lens 21 with respect to the ground, and the unit zones are arranged in order from top to bottom, starting with the unit zone of the upper lens 21. With this arrangement, the upper unit zone can capture people at a long distance, and the lower unit zone can capture people at a close distance.

[0041] 6, the unit area Y is formed by combining unit zones of a plurality of infrared sensors 1, and one unit area Y in this embodiment includes one unit zone each of the three infrared sensors 1a, 1b, and 1c.

[0042] More specifically, the unit area Y is formed by combining unit zones defined by one adjacent left lens 21 (L) and one adjacent right lens 21 (R). For example, one unit area Y1 is formed by combining three unit zones A1, B1, and C1 defined by one adjacent left lens 21 (L1) and one adjacent right lens 21 (R1).

[0043] In each unit area Y, the unit zones are arranged side by side so as not to overlap each other and are vertically shifted in side view. The unit area Y in this embodiment includes areas where the unit zones are arranged without gaps (e.g., Y1, Y2) and areas where the unit zones are arranged with gaps (e.g., Y3 to Y5).

[0044] 3-3. Detection Area X As shown in Fig. 6, the detection area X is formed by combining a plurality of unit areas Y. In this embodiment, the detection area X is formed by five unit areas Y1 to Y5 arranged one above the other with gaps between them so that they do not overlap. Note that the unit areas Y may overlap each other, but in that case, the density of the detection area X can be increased, but the overall detection area X may become narrower.

[0045] In the detection area X of this embodiment, the upper unit areas Y1 and Y2 function as areas for detecting people at long distances, and the lower unit areas Y3, Y4, and Y5 function as areas for detecting people at close distances. In order to accurately detect people at any distance, the unit areas for long-distance detection and the unit areas for short-distance detection are configured so that the arrangement order of the unit zones within the unit areas is different.

[0046] 3-4. Unit Areas Y1 and Y2 for Long-Distance Detection In the unit areas Y1 and Y2 for long-distance detection, as shown in FIG. 6, the unit zone A of the infrared sensor 1a in the dual-type device D is positioned between the unit zones B and C of the two infrared sensors 1b and 1c in the quad-type device Q. For example, in the unit area Y1, the unit zones are arranged in the order B1, A1, and C1 from top to bottom. Furthermore, in each unit area Y1 or Y2 for long-distance detection, the unit zones are arranged side by side with no gaps between them.

[0047] 3-5. Unit Areas Y3, Y4, Y5 for Short-Distance Detection In the unit areas Y3, Y4, and Y5 for short-distance detection, as shown in FIG. 6, the unit zone A of the infrared sensor 1a in the dual-type device D is positioned below the unit zones B and C of the two infrared sensors 1b and 1c in the quad-type device Q. For example, in the unit area Y3, the unit zones are arranged in the order B3, C3, and A3 from top to bottom. In each of the unit areas Y3, Y4, or Y5 for short-distance detection, the unit zones are arranged side by side with a gap between them.

[0048] 4. Operation In the detection area X configured as described above, the human detection sensor device 100 detects as a person an object that simultaneously interferes with the unit zones of the infrared sensors 1. In other words, it detects as a person an object that exceeds a certain height in a side view. In other words, the unit zones are arranged so that an object of a certain height (for example, the average height of an adult) in a side view interferes with the unit zones of the three infrared sensors 1 that are arranged above and below each other.

[0049] For example, person H1 shown in Figure 6 is detected because he interferes with all unit zones A1 to C1 in unit area Y1. Person H2 is detected because he interferes with unit zones A1 and C1 in unit area Y1 and unit zones of three infrared sensors 1a to 1c in unit zone B2 in unit area Y2. On the other hand, small animal S1 is not detected because it interferes with only unit zones A1 and C1 of two of the three infrared sensors 1a to 1c.

[0050] Furthermore, the arrangement of the unit zones in the human detection sensor device 100 is adjusted to prevent false detection of small animals and the like. That is, the human detection sensor device 100 is configured not to detect, as a human, an object that is below a certain height in a side view and within a predetermined size in a plan view. Conversely, the unit zones are arranged so that an object that is below a certain height in a side view and within a predetermined size in a plan view (e.g., a small animal such as a dog) interferes with only the unit zones of some of the three infrared sensors 1, or does not interfere with the unit zones of any of the infrared sensors. Here, a plan view refers to a view of the predetermined detection area X of the human detection sensor device 100 from directly above. In this embodiment, the size in a plan view is the same as the size of the object in the horizontal direction (perspective direction) in a side view.

[0051] For example, in the human detection sensor device 100 of this embodiment, as shown in Figure 6, gaps are provided between unit zones A5, C5, and B5 to disperse the three unit zones so that a small animal S5 only interferes with unit zones B5 and C5 of some of the three infrared sensors 1a to 1c, namely, infrared sensors 1b and 1c.

[0052] 5. Effects The human detection sensor device 100 of the first embodiment configured as described above is provided with three infrared detection sensors 11, and determines that a human has been detected when all of these infrared sensors 1 respond, thereby reducing false alarms caused by small animals, etc.

[0053] Furthermore, since a human detection signal is not output simply because an object interferes with two unit zones, it is possible to narrow the gap between the unit zones of each infrared sensor 1 and ensure human detection accuracy. For example, it is possible to provide unit zones without any gaps, as in the unit areas Y1 and Y2 in Figure 6.

[0054] Since the three infrared sensors 1 are provided as two devices (a dual-type device D and a quad-type device Q), the cost and size can be reduced compared to a configuration using three devices.

[0055] The right lens 21(R) is configured to allow infrared rays to be incident on both of the two infrared sensors 1b, 1c of the quad-type device Q, so the device can be simplified and costs can be reduced compared to a configuration in which different optical mechanisms are provided for each of the two infrared sensors 1b, 1c.

[0056] However, if the right lens 21 (R) defines the unit zones B and C of both the two infrared sensors 1b and 1c in the quad-type device Q, these two unit zones B and C cannot be adjusted independently, which reduces the degree of freedom in the layout of the detection area X, and there is a concern that it may become difficult to form a detection area X that can accurately detect people at various distances.

[0057] To address this concern, in this embodiment, the unit areas Y1 and Y2 for long-distance detection and the unit areas Y3, Y4, and Y5 for short-distance detection are configured so that the arrangement relationship between unit zones B and C of the quad-type device Q and unit zone A of the dual-type device D is different.

[0058] In other words, in the unit areas Y1 and Y2 for long-distance detection, by placing unit zone A between two unit zones B and C that are far apart from each other, it is possible to increase the density of the detection area X at long distances and ensure the accuracy of human detection.

[0059] On the other hand, in the unit areas Y3, Y4, and Y5 for short-distance detection, unit zone A is placed below two closely spaced unit zones B and C, which allows for the dispersion of detection area X at short distances and reduces false alarms caused by small animals, etc.

[0060] In the unit areas Y1 and Y2 for long-distance detection, the unit zones are arranged side by side with no gaps between them, thereby further increasing the density of the long-distance detection area X. On the other hand, in the unit areas Y3, Y4, and Y5 for short-distance detection, the unit zones are arranged side by side with gaps between them, thereby further dispersing the detection area X in short distances.

[0061] As shown in Figure 6, in the detection area X, two unit zones of the same infrared sensor 1 are not arranged consecutively, so that a person, such as person H2, who exists across two unit areas Y1 and Y2, can be detected if he or she interferes with the three unit zones lined up above and below, thereby ensuring the accuracy of person detection in the detection area X.

[0062] Since the dual type device D and the quad type device Q are arranged adjacent to each other on the left and right, there is an advantage in that the design of the left and right lenses 21 can be partially common.

[0063] [Second embodiment] The determination mechanism 3 of the above embodiment outputs a human detection signal indicating that a human has been detected when it determines that all of the fluctuation amounts of incident infrared rays detected by each infrared sensor 1 exceed one predetermined level. In contrast, the determination mechanism of the second embodiment sets a first level and a lower second level as the predetermined levels, and outputs a human detection signal when it determines that a certain number of the fluctuation amounts of incident infrared rays detected by each infrared sensor exceed the first level and the rest exceed the second level.

[0064] In this case, a first level and a second level with different values ​​are set as predetermined levels, which increases the degree of freedom in setting, such as how large the reference values ​​of these two levels should be set to, and which infrared sensor should be set to which level.By flexibly adapting to the installation location of the person detection sensor device, it becomes possible to meet the required person detection accuracy while suppressing false alarms.

[0065] It should be noted that the number of predetermined levels may be set to three or more, and for example, a different predetermined level may be set for each infrared sensor 1 .

[0066] Other Embodiments The human detection sensor device according to the present invention may be used to detect objects other than humans.

[0067] The human detection sensor device 100 in the above embodiment was a high-altitude installation type that was installed at a height of approximately 2 to 6 m from the ground, but the human detection sensor device may also be a low-altitude installation type that was installed at a height of approximately 1 m from the ground, or it may be installed at a higher height.

[0068] The infrared sensor 1 may be another element that detects infrared rays, such as a thermopile element or a bolometer element. The infrared sensor may also be provided in a single-type device having one element.

[0069] Four or more infrared sensors may be provided. In this case, the determination mechanism may output a human detection signal when it determines that the amount of fluctuation in the incident infrared rays detected by all of the four or more infrared sensors exceeds a predetermined level, or may output a human detection signal when it determines that the amount of fluctuation in the incident infrared rays detected by a predetermined number of three or more infrared sensors exceeds a predetermined level.

[0070] It is up to the user to decide which types of devices to combine to use multiple infrared sensors. For example, two quad-type devices may be used to configure a human detection sensor device. It is sufficient that the device can AND detect a person based on the detection results of at least three or more infrared sensors 1.

[0071] Three or more devices each having the infrared sensor 1 may be arranged side by side. In this case, the number of lenses 21 provided may be the same as the number of devices.

[0072] In the optical mechanism 2 of each of the above-described embodiments, the unit zone is defined by the lens 21, but the unit zone may be defined by using a combination of a lens and a reflecting mirror or the like.

[0073] According to the present invention, it is possible to reduce false alarms caused by small animals, etc. Furthermore, it is possible to narrow the gap between the unit zones of each infrared sensor, thereby ensuring the accuracy of human detection.

[0074] REFERENCE SIGNS LIST 100: Human detection sensor device 1: Infrared sensor 2: Optical mechanism 21: Lens 22: Shielding member 3: Determination mechanism 4: Housing D: Dual type device Q: Quad type device X: Detection area Y: Unit area a: Unit zone b: Unit zone c: Unit zone

Claims

1. A human detection sensor device attached at a position higher than the ground or floor surface for detecting a person who has entered a predetermined detection area, comprising: three or more infrared sensors each independently detecting a change amount of incident infrared rays; an optical mechanism defining a unit zone which is an angular range of the infrared rays incident on the infrared sensors; and a judgment mechanism outputting a human detection signal indicating that a person has been detected based on the change amount of the incident infrared rays detected by the infrared sensors, wherein the optical mechanism forms a unit area in which the unit zones of the respective infrared sensors are arranged one above the other, and forms the detection area such that a plurality of the unit areas are arranged one above the other, and the judgment mechanism outputs the human detection signal when it is determined that the change amounts of the incident infrared rays detected by the respective infrared sensors all exceed a predetermined level. The human detection sensor device is characterized by this.

2. The human detection sensor device according to claim 1, wherein the infrared sensor has a structure in which two PIR elements are connected in series with opposite polarities, and a total of three infrared sensors are used, including a quad type device in which two infrared sensors are arranged side by side in one casing and a dual type device in which one infrared sensor is provided in one casing.

3. The human detection sensor device according to claim 2, wherein the unit area is formed such that the unit zone of the dual type infrared sensor is located between the unit zones of the two infrared sensors in the quad type.

4. The human detection sensor device according to claim 1, wherein three of the infrared sensors are used, and in the unit area, in the upper unit area for long-distance detection and the lower unit area for short-distance detection, the arrangement order of the unit zones in the unit area is different.

5. The human detection sensor device according to claim 1, wherein a first level and a second level lower than this are set as the predetermined level, and the judgment mechanism outputs the human detection signal when it is determined that a certain number of the change amounts of the incident infrared rays detected by the respective infrared sensors exceed the first level and the remaining exceed the second level.

6. In the detection area, an object exceeding a certain height interferes with the unit zones of the respective infrared sensors, and an object below the certain height and within a predetermined size in plan view is configured to interfere only with the unit zones of some of the respective infrared sensors or not to interfere with the unit zones of any of the infrared sensors. The human detection sensor device according to claim 1.

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