Infrared intrusion detector

Abstract

The embodiment of the present application discloses an infrared intrusion detector, and belongs to the field of security equipment. The infrared intrusion detector comprises: a pyroelectric infrared sensor, the pyroelectric infrared sensor having a photosensitive surface; a mirror array, the mirror array comprising a plurality of mirror groups, the plurality of mirror groups being arranged in sequence along a first direction; along a second direction, the mirror groups sequentially comprising a first side edge part, a middle part and a second side edge part; the first side edge part and the second side edge part each comprising at least one mirror, the reflecting surface of the mirror being at least part of a parabolic surface, the mirror reflecting and converging infrared light to the photosensitive surface; wherein the central axis of the parabolic surface of the at least one mirror of the first side edge part and the second direction forms an acute angle, and / or the central axis of the parabolic surface of the at least one mirror of the second side edge part and the second direction forms an obtuse angle. Through the present application, the problem of low detection accuracy of the infrared intrusion detector using mirrors in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of security equipment, and more particularly to an infrared intrusion detector. Background Technology

[0002] An intrusion detector, also known as a motion detector, primarily utilizes passive infrared (LIN) detection, microwave detection, or video technology to detect human entry into a protected area. For intrusion detectors employing LIN detection, a lens or mirror unit at the front end collects infrared signals from a human within the protected area and converges these signals to a pyroelectric passive infrared sensor (Pyro). The Pyro converts the infrared signal into an electrical signal. When a human intrudes, the temperature difference between the intruding person and the ambient background temperature is detected by the infrared intrusion detector, triggering an alarm.

[0003] For infrared intrusion detectors that use reflectors, infrared light from each zone (detection area) is reflected by the reflectors and converges to the pyroelectric infrared sensor. In actual use, the applicant found that its detection accuracy is low, and it is easy to issue an alarm when there is no intrusion or to have no response when there is an intrusion, which greatly affects its security.

[0004] Therefore, the infrared intrusion detectors using reflectors in related technologies suffer from low detection accuracy, and no effective solution has yet been proposed to address this issue.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Summary of the Invention

[0006] This invention provides an infrared intrusion detector to at least solve the problem of low detection accuracy of infrared intrusion detectors using reflectors in related technologies.

[0007] According to a first aspect of the present invention, an infrared intrusion detector is provided, comprising: a pyroelectric infrared sensor having a photosensitive surface; a reflector array including a plurality of reflector groups arranged sequentially along a first direction; along a second direction, each reflector group sequentially includes a first side portion, a middle portion, and a second side portion; each of the first and second side portions includes at least one reflector, the reflecting surface of which is at least a portion of a parabola, and the reflector reflects and converges infrared light onto the photosensitive surface; wherein the central axis of the parabola containing at least one reflector on the first side portion forms an acute angle with the second direction, and / or the central axis of the parabola containing at least one reflector on the second side portion forms an obtuse angle with the second direction.

[0008] Optionally, along the second direction, the pyroelectric infrared sensor is located between the first side portion and the second side portion.

[0009] Optionally, along the direction closer to the center, the angle between the central axis of the paraboloid on the first side and the second direction gradually increases; and / or, along the direction closer to the center, the angle between the central axis of the paraboloid on the second side and the second direction gradually decreases.

[0010] According to a second aspect of the present invention, an infrared intrusion detector is also provided, comprising: a pyroelectric infrared sensor having a photosensitive surface; a reflector array comprising a plurality of reflector groups arranged sequentially along a first direction, each reflector group comprising a plurality of reflectors, the plurality of reflectors belonging to the same reflector group being arranged sequentially along a second direction to reflect and converge infrared light from multiple directions onto the photosensitive surface, wherein the reflector surface of each reflector is at least a portion of a parabolic surface; wherein at least one reflector of a reflector group is arranged in reverse order, and along the second direction, the reflector arranged in reverse order is located on one side of the pyroelectric infrared sensor and reflects infrared light from the pyroelectric infrared sensor on the same side along the second direction to the photosensitive surface.

[0011] Optionally, all the reflectors located on both sides of the pyroelectric infrared sensor along the second direction are arranged in reverse order. Alternatively, among multiple reflectors belonging to the same reflector group, some reflectors are arranged in reverse order and others are arranged in forward order. Along the second direction, the reflectors arranged in forward order are located on one side of the pyroelectric infrared sensor and reflect infrared light from the opposite side of the pyroelectric infrared sensor along the second direction to the photosensitive surface. Along the second direction, the reflectors arranged in reverse order are located on both sides of the reflectors arranged in forward order.

[0012] According to a third aspect of the present invention, an infrared intrusion detector is also provided, comprising: a pyroelectric infrared sensor having a photosensitive surface; a reflector array comprising a plurality of reflector groups arranged sequentially along a first direction, each reflector group comprising a plurality of reflectors, the plurality of reflectors belonging to the same reflector group being arranged sequentially along a second direction to reflect and converge infrared light from multiple directions onto the photosensitive surface, wherein the reflecting surface of each reflector is at least a portion of a parabolic surface; wherein at least one reflector of a reflector group is arranged in reverse order, and along the second direction, the reflector arranged in reverse order is located on one side of the pyroelectric infrared sensor, and the opening of the parabolic surface on which its reflecting surface is located faces the same side as the pyroelectric infrared sensor.

[0013] Optionally, all the reflectors located on both sides of the pyroelectric infrared sensor along the second direction are arranged in reverse order; or, among multiple reflectors belonging to the same reflector group, some reflectors are arranged in reverse order and others are arranged in forward order. Along the second direction, the reflectors arranged in forward order are located on one side of the pyroelectric infrared sensor, and the opening of the parabolic surface on which their reflective surface is located faces the opposite side of the pyroelectric infrared sensor. Along the second direction, the reflectors arranged in reverse order are located on both sides of the reflectors arranged in forward order.

[0014] Optionally, multiple mirrors belonging to the same mirror group are aligned along the first direction, or multiple mirrors belonging to the same mirror group are staggered along the first direction.

[0015] Optionally, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first and second directions. The reflector array and the pyroelectric infrared sensor are spaced apart along the third direction. Alternatively, multiple reflectors belonging to the same reflector group are aligned along the third direction, or multiple reflectors belonging to the same reflector group are staggered along the third direction.

[0016] Optionally, multiple mirrors belonging to the same mirror group are arranged sequentially along an arc trajectory, with the arc trajectory protruding in a third direction.

[0017] Optionally, the pyroelectric infrared sensor is a four-element dual-channel sensor, which includes two detection channels. Each detection channel includes a positive pyroelectric detector element and a negative pyroelectric detector element. Each reflector group reflects the received infrared light to one of the two detection channels. The detection channels corresponding to any two adjacent reflector groups are different, and the detection areas corresponding to any two adjacent reflector groups are set at intervals.

[0018] Optionally, the pyroelectric infrared sensor includes two binary single-channel sensors. Each binary single-channel sensor includes a positive pyroelectric detector element and a negative pyroelectric detector element. Each reflector group reflects the received infrared light to one of the two binary single-channel sensors. The binary single-channel sensors corresponding to any two adjacent reflector groups are different, and the detection areas corresponding to any two adjacent reflector groups are set at intervals.

[0019] Optionally, the infrared intrusion detector includes a housing, a pyroelectric infrared sensor, and a reflector array, all mounted inside the housing. The housing has windows for allowing infrared light to pass through, and the windows extend to at least two adjacent surfaces of the housing.

[0020] The infrared intrusion detector of this invention includes a pyroelectric infrared sensor and a mirror array. The mirror array is divided into multiple mirror groups arranged sequentially along a first direction. Each mirror group includes multiple mirrors, and the reflecting surface of each mirror is at least a portion of a parabola. For each mirror group, the multiple mirrors are divided into a first side portion, a middle portion, and a second side portion. Along a second direction, the first side portion, the middle portion, and the second side portion are arranged sequentially. Each of the first and second side portions includes at least one mirror. Each mirror reflects and converges infrared light in a specific direction onto a photosensitive surface. The angle between the central axis of the parabola containing at least one mirror on the first side portion and the second direction is acute, and / or the angle between the central axis of the parabola containing at least one mirror on the second side portion and the second direction is obtuse. In this mirror arrangement, at least one of the first and second side portions alters the reflection mode of the mirror. Specifically, with this new reflection method, infrared light from one side of the pyroelectric infrared sensor along the second direction is reflected back to the pyroelectric infrared sensor by the mirror on the same side, which is the opposite of the way mirrors reflect light in related technologies (for example, in the figure, infrared light from one side of the pyroelectric infrared sensor along the second direction is reflected back to the pyroelectric infrared sensor by the mirror on the opposite side). The parabolic region utilized by the mirrors in this arrangement differs significantly from that in related technologies. Mirrors in related technologies use the area near the vertex of the parabola as the reflecting surface, while the mirror in this embodiment uses the edge region of the parabola (or the region far from the vertex) as the reflecting surface. When the edge region of the parabola reflects light, it causes a certain distortion. This distortion cancels out the distortion caused by the pyroelectric infrared sensor's oblique angle, thus helping to eliminate imaging distortion in the detector and improving the detection accuracy of the infrared intrusion detector, solving the problem of low detection accuracy in infrared intrusion detectors in related technologies. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a partial structural schematic diagram of an infrared intrusion detector provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the infrared light reflection of each reflector and the direction of the central axis (optical axis) of the infrared intrusion detector provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram showing the infrared light reflection of each mirror in an infrared intrusion detector in related technologies and the direction of the central axis (optical axis);

[0025] Figure 4 This is a schematic diagram of the reflector array of an infrared intrusion detector provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of an infrared intrusion detector provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of an infrared intrusion detector using a mirror arrangement in the forward sequence (left side) and a mirror arrangement in the reverse sequence (right side);

[0028] Figure 7 This is a schematic diagram of the detection area (defense zone) of an infrared intrusion detector using a mirror arrangement in the forward sequence (left side) and a mirror arrangement in the reverse sequence (right side);

[0029] Figure 8 The diagram shows the structure of the quaternary dual-channel sensor (left) and the binary single-channel sensor (right) used in the infrared intrusion detector provided in the embodiments of the present invention.

[0030] Figure 9 This is a schematic diagram illustrating the application of the infrared intrusion detector provided in this embodiment of the invention to pet and human identification.

[0031] The above figures include the following reference numerals:

[0032] 1. Pyroelectric infrared sensor; 10. Photosensitive surface; 11. Pyroelectric detector element; 2. Mirror array; 20. Mirror group; 21. First side part; 22. Middle part; 23. Second side part; 200. Mirror; 201. Detection area; 3. Housing; 31. Window; 4. Mirror fixing structure; 5. PCB board; 6. Indicator light; 7. Light guide column. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Regarding the low detection accuracy of infrared intrusion detectors using reflectors in related technologies, the applicant, through research and analysis, discovered that the root cause affecting detection accuracy lies in the fact that most of the light reflected by the reflectors shines obliquely onto the photosensitive surface of the pyroelectric infrared sensor. This causes the pyroelectric infrared sensor to be angled, resulting in distortion of the image in the protected area. Distortion, a type of optical aberration, refers to the difference between the image quality and the ideal image quality after an object passes through an optical lens due to aberrations. Distortion specifically refers to the distortion, deformation, stretching, compression, etc., between the image and the ideal image. Figure 3 As shown, each mirror group 20 (each layer of mirrors) in the infrared intrusion detector of the related technology adopts Figure 3 In this arrangement, each reflector 200 is taken from the portion of the parabola near its vertex, and multiple reflectors 200 are arranged sequentially along an arc trajectory, thereby converging infrared light from various directions to the pyroelectric infrared sensor 1 through multiple reflectors 200. Figure 3 Only the optical paths of the outermost reflectors a and i are shown; the optical paths of the other mirrors are omitted. It can be seen that the closer the reflectors 200 are to the sides, the greater the angle at which the reflected light is directed towards the pyroelectric infrared sensor 1. The corresponding field of view (FOV) of the infrared intrusion detector is also larger. Therefore, the closer the reflectors 200 are to the sides, the greater the imaging distortion of the corresponding protected area. The distortion can be seen from... Figure 7As seen in the upper part, each reflector 200 reflects infrared light from a specific protected zone to the pyroelectric infrared sensor 1. The closer the protected zones are to the sides (e.g., zones 1, 9, 2, and 8), the greater the angle of the light reflected by their corresponding reflectors 200 relative to the pyroelectric infrared sensor 1. Therefore, the effect of sensor misalignment is greater, ultimately leading to greater image distortion in the protected zone. Due to this image distortion, the actual area detected by the detector changes, potentially causing false triggering or non-triggering, thus affecting its operational accuracy.

[0036] To address the issue of low detection accuracy in infrared intrusion detectors, such as... Figures 1 to 9 As shown, an embodiment of the present invention provides an infrared intrusion detector, comprising: a pyroelectric infrared sensor 1 having a photosensitive surface 10; a reflector array 2 including multiple reflector groups 20 arranged sequentially along a first direction; along a second direction, each reflector group 20 includes a first side portion 21, a middle portion 22, and a second side portion 23; each of the first side portion 21 and the second side portion 23 includes at least one reflector 200, the reflecting surface of the reflector 200 being at least a portion of a parabola, the reflector 200 reflecting and converging infrared light onto the photosensitive surface 10; wherein, the angle between the central axis of the parabola containing at least one reflector 200 of the first side portion 21 and the second direction is an acute angle, and / or, the angle between the central axis of the parabola containing at least one reflector 200 of the second side portion 23 and the second direction is an obtuse angle.

[0037] The infrared intrusion detector of this invention includes a pyroelectric infrared sensor 1 and a reflector array 2. The reflector array 2 is divided into multiple reflector groups 20 arranged sequentially along a first direction. Each reflector group 20 includes multiple reflectors 200. The reflecting surface of each reflector 200 is at least a portion of a parabola. For each reflector group 20, the multiple reflectors 200 are divided into a first side portion 21, a middle portion 22, and a second side portion 23. Along a second direction, the first side portion 21, the middle portion 22, and the second side portion 23 are arranged sequentially. Each of the first side portion 21 and the second side portion 23 includes at least one reflector 200. Each reflector 200 reflects and converges infrared light in a specific direction onto the photosensitive surface 10. The central axis of the parabola containing at least one reflector 200 of the first side portion 21 forms an acute angle with the second direction, and / or the central axis of the parabola containing at least one reflector 200 of the second side portion 23 forms an obtuse angle with the second direction. In this detector arrangement, at least one of the first side portion 21 and the second side portion 23 alters the reflection method of the reflector 200. Specifically, with this new reflection method, infrared light from one side of the pyroelectric infrared sensor 1 is reflected back to the pyroelectric infrared sensor 1 by the reflector 200 on the same side along the second direction, which is the opposite of the reflection method of reflectors in related technologies (e.g., Figure 3 In this embodiment, along the second direction, infrared light from one side of the pyroelectric infrared sensor 1 is reflected back to the pyroelectric infrared sensor 1 by the mirror 200 on the opposite side. The parabolic region utilized by the mirror 200 in this arrangement differs significantly from that of mirrors 200 in related technologies. While mirrors 200 in related technologies utilize the area near the vertex of the parabola as the reflecting surface, the mirror 200 in this embodiment utilizes the edge region of the parabola (or the region far from the vertex) as the reflecting surface. When the edge region of the parabola reflects light, it causes a certain degree of distortion. This distortion cancels out the distortion caused by the oblique viewing of the pyroelectric infrared sensor 1, thereby helping to eliminate imaging distortion in the detector and improving the detection accuracy of the infrared intrusion detector, thus solving the problem of low detection accuracy in infrared intrusion detectors in related technologies.

[0038] It should be noted that the aforementioned "first direction" and "second direction" are merely used to refer to different directions. The names of the first side portion 21, the middle portion 22, and the second side portion 23 only serve to refer to a portion of the reflector 200 and have no other limiting meaning. The aforementioned "first direction" and "second direction" should be understood as unilateral directions, not bidirectional directions. Figure 4 As shown, from this perspective, the first direction is upward, the second direction is to the right, and so on. Figures 1 to 2As shown, the second direction is to the right. The middle part 22 may include one reflector 200 or multiple reflectors 200.

[0039] The special arrangement of the reflectors described above is referred to as the reverse arrangement (e.g., Figure 2 In the second direction, infrared light from one side of the pyroelectric infrared sensor 1 is reflected back to the pyroelectric infrared sensor 1 by the mirror 200 on the same side. The mirror arrangement in the related technology is called the forward sequence arrangement (e.g., Figure 3 In the second direction, infrared light from one side of the pyroelectric infrared sensor 1 is reflected back to the pyroelectric infrared sensor 1 by the mirror 200 on the opposite side. In specific implementations, each mirror 200 of the first side portion 21 and / or the second side portion 23 may adopt the above-described reverse arrangement. As long as any mirror 200 adopts the above-described reverse arrangement, the imaging distortion of its corresponding protection zone can be eliminated. For example, if the angle between the central axis of the parabola on which at least one mirror 200 of the first side portion 21 is located and the second direction is an acute angle, then at least one mirror 200 of the first side portion 21 adopts the reverse arrangement; if the angle between the central axis of the parabola on which at least one mirror 200 of the second side portion 23 is located and the second direction is an obtuse angle, then at least one mirror 200 of the second side portion 23 adopts the reverse arrangement.

[0040] To more clearly understand the lens arrangement of the infrared intrusion detector in this embodiment, such as Figure 3 As shown, in the related infrared intrusion detector, each reflector 200 of the reflector group 20 is arranged in a forward sequence. To achieve better light reflection and focusing, each reflector 200 utilizes the area near the vertex of the parabola as much as possible. Therefore, infrared light from each detection zone (detection area 201) is directed along the central axis of the parabola to the corresponding reflector 200 and reflected approximately along the central axis of the parabola to the pyroelectric infrared sensor 1. Since the reflectors 200 utilize the area near the vertex of the parabola for light reflection, the distortion caused by the lens itself is negligible and cannot compensate for the distortion caused by the sensor's squinting. Ultimately, this results in a large distortion in the detector's image of the corresponding detection zone, affecting detection accuracy. However, in this embodiment, as... Figure 1 and 2As shown, the mirrors 200 of the mirror assembly 20 adopt the aforementioned reverse arrangement. Specifically, along the second direction, the mirror assembly 20 is subjectively divided into a first side portion 21, a middle portion 22, and a second side portion 23. The central axis of the parabola on which at least one mirror 200 of the first side portion 21 is located (i.e., the central axis of the parabola on which the reflecting surface of the mirror 200 is located, hereinafter referred to as the central axis of the mirror 200) makes an acute angle with the second direction (e.g., the angle between the central axis of mirror i and the second direction is acute), and / or, the central axis of at least one mirror 200 of the second side portion 23 makes an obtuse angle with the second direction (e.g., the angle between the central axis of mirror a and the second direction is obtuse). This is completely opposite to the forward arrangement of mirrors in the related art, such as... Figure 3 As shown, in the related technology, the angle between the central axis of mirror i and the second direction is obtuse, while the angle between the central axis of mirror a and the second direction is acute. This detector, employing a different mirror arrangement than in the related technology, changes the reflection method of mirror 200. Along the second direction, infrared light from either side of the pyroelectric infrared sensor 1 is reflected back to the pyroelectric infrared sensor 1 by mirror 200 on the same side. Due to the significant change in the optical path, the parabolic region used differs significantly from that of mirror 200 in the related technology; that is, the edge region of the parabola (or the region far from the vertex) is used as the reflecting surface. When the edge region of the parabola reflects light, it causes a certain distortion. This distortion cancels out the distortion caused by the oblique viewing of the pyroelectric infrared sensor 1, thus helping to eliminate imaging distortion in the detector and improving the detection accuracy of the infrared intrusion detector.

[0041] As described above, in specific implementations, each of the reflectors 200 on the first side portion 21 and / or the second side portion 23 may adopt the aforementioned reverse arrangement. Therefore, different implementation scenarios are possible: In the first scenario, at least some of the reflectors on the first side portion 21 are arranged in reverse order, and at least some of the reflectors on the second side portion 23 are arranged in reverse order; in the second scenario, at least some of the reflectors on the first side portion 21 are arranged in reverse order, and at least some of the reflectors on the second side portion 23 are arranged in forward order; in the third scenario, at least some of the reflectors on the first side portion 21 are arranged in forward order, and at least some of the reflectors on the second side portion 23 are arranged in reverse order. These implementations can be flexibly selected according to the specific requirements of the detection area. As long as some or all of the reflectors 200 on the corresponding side portion are arranged in reverse order, the imaging distortion of the corresponding defense zone can be reduced or eliminated, and the detection accuracy of the detector for the corresponding defense zone can be improved.

[0042] In a preferred embodiment, along the second direction, the pyroelectric infrared sensor 1 is located between the first side portion 21 and the second side portion 23. Along the direction near the middle portion 22, the angle between the central axis of the parabolic surface where each reflector 200 of the first side portion 21 is located and the second direction gradually increases. Along the direction near the middle portion 22, the angle between the central axis of the parabolic surface where each reflector 200 of the second side portion 23 is located and the second direction gradually decreases.

[0043] In other words, in this embodiment, each of the reflectors 200 on the first side portion 21 and the second side portion 23 adopts the reverse arrangement method that is opposite to that in the related art. By setting the central axis angle of each reflector 200 as described above, the light from each defense zone in the horizontal direction is reflected to the photosensitive surface 10 of the pyroelectric infrared sensor 1 through different reflectors 200. This can effectively eliminate the distortion when imaging each defense zone, thereby ensuring the detection accuracy of the infrared intrusion detector for each defense zone.

[0044] In addition, embodiments of the present invention also provide an infrared intrusion detector, comprising: a pyroelectric infrared sensor 1 having a photosensitive surface 10; a reflector array 2 including multiple reflector groups 20, the multiple reflector groups 20 being arranged sequentially along a first direction, each reflector group 20 including multiple reflectors 200, the multiple reflectors 200 belonging to the same reflector group 20 being arranged sequentially along a second direction, so as to reflect and converge infrared light from multiple directions to the photosensitive surface 10 through the multiple reflectors 200, the reflecting surface of each reflector 200 being at least a part of a parabolic surface; wherein, at least one reflector 200 of the reflector group 20 is arranged in reverse order, along the second direction, the reflector 200 arranged in reverse order is located on one side of the pyroelectric infrared sensor 1, and reflects infrared light from the pyroelectric infrared sensor 1 on the same side along the second direction to the photosensitive surface 10.

[0045] like Figures 1 to 9As shown, in the infrared intrusion detector with the above-described structure, at least one reflector 200 of the reflector group 20 is arranged in a reverse order. The reverse order arrangement is defined as follows: along the second direction, the reflector 200 is located on one side of the pyroelectric infrared sensor 1, and it can reflect infrared light from that side of the pyroelectric infrared sensor 1 to the photosensitive surface 10. In other words, the reflector 200 with this reverse order arrangement does not reflect the incoming infrared light in a forward direction, but receives the incoming infrared light at an oblique angle and reflects it obliquely to the pyroelectric infrared sensor 1. Compared with the forward reflection structure, this reverse order arrangement of the reflector 200 with oblique reflection utilizes the edge part of the parabola (or the part away from the vertex) of the reflecting surface. When the edge part of the parabola is used for reflection, the reflector 200 itself will cause a certain distortion. This distortion will cancel out the distortion caused by the oblique angle of the pyroelectric infrared sensor 1, thereby helping to eliminate the imaging distortion of the detector and improve the detection accuracy of the infrared intrusion detector, solving the problem of low detection accuracy of infrared intrusion detectors in related technologies.

[0046] Infrared intrusion detectors that employ a 200-mirror-in-order arrangement are examples of related technologies. Figure 3 As shown, the reflector 200 is located on one side of the pyroelectric infrared sensor 1 along the second direction and reflects the infrared light from the opposite side of the pyroelectric infrared sensor 1 along the second direction to the photosensitive surface 10. During the process of reflecting the infrared light from the detection area 201 (defense zone) to the photosensitive surface 10, the reflectors 200 on both sides of the pyroelectric infrared sensor 1 cannot compensate for the distortion caused by the oblique viewing of the pyroelectric infrared sensor 1. This distortion is particularly pronounced at large field-of-view angles, leading to inaccurate detection of the actual detection area 201 and easily causing false triggering or non-triggering. Therefore, the detection accuracy of its infrared intrusion detector is low.

[0047] The aforementioned reflector 200 can be located on any side of the pyroelectric infrared sensor 1 along the second direction, for example... Figure 1 and Figure 2 The left and right sides of the pyroelectric infrared sensor 1, rather than the top or bottom, can be used to determine whether a reflector 200 is located on one side of the pyroelectric infrared sensor 1 along the second direction. There are several ways to determine this. For example, a cross-section perpendicular to the second direction can be made, which divides the pyroelectric infrared sensor 1 into two parts of equal length along the second direction. The reflectors 200 located on both sides of this cross-section are located on one side of the pyroelectric infrared sensor 1 along the second direction. Another example is to draw a perpendicular line through the geometric center of the photosensitive surface 10 along the second direction. The reflectors 200 located on both sides of this perpendicular line are located on one side of the pyroelectric infrared sensor 1 along the second direction.

[0048] The aforementioned mirror array 2 is a type of mirror array. Passive infrared intrusion detectors typically require Fresnel lens arrays or mirror arrays to achieve the detector's zone protection function. Its function is to ensure that the detector's detection angle reaches the required range, including both vertical and horizontal viewing angles, and to amplify the radiation signal reaching the pyroelectric infrared sensor 1 through the converging function of the mirrors, thereby reaching its trigger threshold.

[0049] In a preferred embodiment, all the reflectors 200 located on both sides of the pyroelectric infrared sensor 1 along the second direction are arranged in reverse order. That is, along the second direction, all the reflectors 200 located on the sides of the pyroelectric infrared sensor 1 are arranged in reverse order as described above. This effectively eliminates shape distortion of the detection areas 201 reflected by each reflector 200, thereby enabling the infrared intrusion detector to accurately detect multiple required detection areas 201 and ensuring the detection accuracy of the infrared intrusion detector. In practical implementation, along the second direction, the infrared intrusion detector may only include the reflectors 200 located on both sides of the pyroelectric infrared sensor 1. For example, the number of reflectors 200 is even, and the even number of reflectors 200 are symmetrically arranged on both sides of the pyroelectric infrared sensor 1 along the second direction. The infrared intrusion detector may also include a reflector 200 located in the middle, for example... Figure 1 As shown, the number of reflectors 200 is odd. Along the second direction, the middle reflector 200 is positioned directly opposite the pyroelectric infrared sensor 1, and the other reflectors 200 are symmetrically arranged on both sides of it.

[0050] In another embodiment, among the multiple mirrors 200 belonging to the same mirror group 20, some mirrors 200 are arranged in reverse order, while others are arranged in forward order. Along the second direction, the mirrors 200 arranged in forward order are located on one side of the pyroelectric infrared sensor 1 and reflect infrared light from the opposite side of the pyroelectric infrared sensor 1 along the second direction to the photosensitive surface 10. Along the second direction, the mirrors 200 arranged in reverse order are located on both sides of the mirrors 200 arranged in forward order. In other words, along the second direction, the mirrors 200 near the middle are arranged in forward order, while the mirrors 200 near the sides are arranged in reverse order. Although the reflector 200 arranged in a forward sequence cannot eliminate the distortion caused by the pyroelectric infrared sensor 1's squint, the distortion is not obvious in the small-angle field of view near the middle. For the large-angle field of view where the distortion is more severe, the reflector 200 arranged in a reverse sequence can effectively eliminate the distortion. This combination of forward and reverse arrangement is also a viable option, which can also control the distortion well.

[0051] Forward and reverse arrangement methods can be combined. Figures 1 to 3 To understand, such as Figures 1 to 3 As shown, in this embodiment, there are nine reflectors 200, which are, from right to left, reflector a, reflector b, reflector c, reflector d, reflector e, reflector f, reflector g, reflector h, and reflector i. Figure 1 and Figure 2 The various reflectors 200 are arranged in reverse order. Figure 3 The individual reflectors 200 are arranged in a forward sequence similar to related technologies. Figures 1 to 3 Only partial optical path diagrams are shown (the optical paths of the rightmost reflector a and the leftmost reflector i). With the reflector arranged in reverse order, infrared light from the right is reflected by the right reflector a to the pyroelectric infrared sensor 1, and infrared light from the left is reflected by the left reflector i to the pyroelectric infrared sensor 1. The directions of the central axes of each reflector 200 are as follows: Figure 2 and Figure 3 As shown, in order to more effectively focus infrared light onto the photosensitive surface 10 of the pyroelectric infrared sensor 1, the central axis of the reflecting surface of each reflector 200 points towards the pyroelectric infrared sensor 1. When arranged in a reverse order, such as... Figure 2As shown, the central axis of the reflecting surface of the rightmost reflector a is located on the leftmost side, and the central axis of the reflecting surface of the leftmost reflector i is located on the rightmost side. This means that the parts utilized by reflectors a and i are not the portion near the vertex of the parabola, but rather the sidewalls (the portion far from the vertex) of the parabola for reflection. It can be understood that each reflector 200 is a small section cut from a large parabola, arranged sequentially to form the reflector group 20. The closer the reflectors 200 are to the sides (e.g., reflectors a and i), the closer their cut parabola sections are to the edge. Since using the edge portion of the parabola for reflection causes distortion, this distortion can cancel out the distortion caused by the oblique view of the pyroelectric infrared sensor 1, thereby improving the working accuracy of the infrared intrusion detector. In the case of a sequential arrangement, as shown... Figure 3 As shown, the central axis of the reflecting surface of the rightmost reflector a is located on the rightmost side, and the central axis of the reflecting surface of the leftmost reflector a is located on the leftmost side. For each reflector 200, infrared light is incident along the central axis and converges to the vicinity of the focal point after being reflected approximately along the central axis. In this case, each reflector 200 needs to make full use of the part located near the vertex of the parabola. This cannot compensate for the distortion caused by the oblique view of the pyroelectric infrared sensor 1. Therefore, the infrared intrusion detector using the forward arrangement of reflectors 200 will have a distortion in the shape of the detection area 201 when in use, which will affect the working accuracy.

[0052] Furthermore, embodiments of the present invention also provide an infrared intrusion detector, comprising: a pyroelectric infrared sensor 1 having a photosensitive surface 10; a reflector array 2 including multiple reflector groups 20, the multiple reflector groups 20 being arranged sequentially along a first direction, each reflector group 20 including multiple reflectors 200, the multiple reflectors 200 belonging to the same reflector group 20 being arranged sequentially along a second direction, so as to reflect and converge infrared light from multiple directions to the photosensitive surface 10 through the multiple reflectors 200, the reflecting surface of each reflector 200 being at least a part of a parabola; wherein, at least one reflector 200 of the reflector group 20 is arranged in reverse order, along the second direction, the reflector 200 arranged in reverse order is located on one side of the pyroelectric infrared sensor 1, and the opening of the parabola on which its reflecting surface is located is arranged facing the same side of the pyroelectric infrared sensor 1.

[0053] In the infrared intrusion detector of this embodiment, at least one reflector 200 of the reflector group 20 is arranged in reverse order. This reverse order arrangement is defined as follows: along the second direction, the reflector 200 arranged in reverse order is located on one side of the pyroelectric infrared sensor 1, and the opening of the parabolic surface containing its reflecting surface faces the same side as the pyroelectric infrared sensor 1. In other words, the reverse order arrangement applies to the reflector 200 located on one side of the pyroelectric infrared sensor 1 along the second direction. This "one side" can be any side along the second direction, for example... Figure 1 and Figure 2 In the middle, the second direction is right. Therefore, the reflector 200 arranged in reverse order needs to be located on the left or right side of the pyroelectric infrared sensor 1. Furthermore, the opening of the parabolic surface on which its reflective surface is located faces the same side as the pyroelectric infrared sensor 1. That is to say, when the reflector 200 is located on the left side of the pyroelectric infrared sensor 1, the opening of the parabolic surface on which its reflective surface is located faces the left side of the pyroelectric infrared sensor 1.

[0054] The reflector 200, arranged in a reverse order, has a reflective surface that is not near the vertex of the parabola, but rather offset from it. When infrared light is reflected by this reflector, it is angled towards the reflector 200 and then angled towards the photosensitive surface 10. The reflector 200 itself introduces some distortion, which cancels out the distortion caused by the angled reflection of the pyroelectric infrared sensor 1. This helps to eliminate the imaging distortion of the detector, thereby improving the detection accuracy of the infrared intrusion detector and solving the problem of low detection accuracy in related technologies. Especially for detection areas with a large field of view (a larger angle range on both sides of the infrared intrusion detector), it can significantly suppress the shape distortion of the detection area 201, thus improving the working accuracy of the infrared intrusion detector and solving the problem of low detection accuracy caused by the shape distortion of the detection area reflected by the reflector in related technologies.

[0055] It should be noted that the aforementioned reflector 200 is located on one side of the pyroelectric infrared sensor 1 and on the same side where the opening of the parabolic surface faces the pyroelectric infrared sensor 1. Here, "one side" or "same side" can refer to an inclined direction, as long as there is a component on that side, and should not be interpreted as a directly facing direction. For example... Figure 1 and Figure 2In the second direction, reflectors a, b, c, and d are all located on one side (right side) of the pyroelectric infrared sensor 1. Being located diagonally to the right of the pyroelectric infrared sensor 1 belongs to the aforementioned side of the pyroelectric infrared sensor 1, and their central axes are arranged from the upper left to the lower right. That is to say, the opening of the parabolic surface on which their reflecting surface is located faces the lower right, but it has a component facing the right (tilting to the right). Therefore, the opening of the parabolic surface is set towards the right side of the pyroelectric infrared sensor 1, which satisfies the reverse arrangement method.

[0056] In one embodiment, all the reflectors 200 located on both sides of the pyroelectric infrared sensor 1 along the second direction are arranged in reverse order. This effectively eliminates the shape distortion of each detection area 201 reflected by each reflector 200, thereby enabling the infrared intrusion detector to accurately detect multiple required detection areas 201 and ensuring the detection accuracy of the infrared intrusion detector.

[0057] In another embodiment, among the multiple mirrors 200 belonging to the same mirror group 20, some mirrors 200 are arranged in reverse order, while others are arranged in forward order. Along the second direction, the mirrors 200 arranged in forward order are located on one side of the pyroelectric infrared sensor 1, and the opening of the parabolic surface on which their reflective surface is located faces the opposite side of the pyroelectric infrared sensor 1. Along the second direction, the mirrors 200 arranged in reverse order are located on both sides of the mirrors 200 arranged in forward order. That is, in this embodiment, among the multiple mirrors 200 belonging to the same mirror group 20, some are arranged in reverse order, while others are arranged in forward order. The mirrors 200 arranged in reverse order are located on both sides of the mirrors 200 arranged in forward order along the second direction. In other words, along the second direction, the mirrors 200 closer to the middle are arranged in forward order, while the mirrors 200 closer to the sides are arranged in reverse order. Although the reflector 200 arranged in a forward sequence cannot cancel the distortion caused by the pyroelectric infrared sensor 1 due to the need to use the reflective surface near the top of the parabola, this distortion is not obvious in the small-angle field of view near the middle. For the large-angle field of view where the distortion is more severe, the reflector 200 arranged in a reverse sequence can effectively eliminate the distortion. This combination of forward and reverse arrangement is also a viable option, which can also control the distortion well.

[0058] Forward and reverse arrangement methods can be combined. Figures 1 to 3 To understand, such as Figures 1 to 3As shown, in this embodiment, there are nine reflectors 200, which are, from right to left, reflector a, reflector b, reflector c, reflector d, reflector e, reflector f, reflector g, reflector h, and reflector i. Figure 1 and Figure 2 The various reflectors 200 are arranged in reverse order. Figure 3 The individual reflectors 200 are arranged in a forward sequence similar to related technologies. Figures 1 to 3 Only partial optical path diagrams are shown (the optical paths of the rightmost reflector a and the leftmost reflector i). With the reflector arranged in reverse order, infrared light from the right is reflected by the right reflector a to the pyroelectric infrared sensor 1, and infrared light from the left is reflected by the left reflector i to the pyroelectric infrared sensor 1. The directions of the central axes of each reflector 200 are as follows: Figure 2 and Figure 3 As shown, in order to more effectively focus infrared light onto the photosensitive surface 10 of the pyroelectric infrared sensor 1, the central axis of the reflecting surface of each reflector 200 points towards the pyroelectric infrared sensor 1. When arranged in a reverse order, such as... Figure 2 As shown, the central axis of the reflecting surface of the rightmost reflector a is located on the leftmost side, and the central axis of the reflecting surface of the leftmost reflector i is located on the rightmost side. This means that the parts utilized by reflectors a and i are not the portion near the vertex of the parabola, but rather the sidewalls (the portion far from the vertex) of the parabola for reflection. It can be understood that each reflector is a small section cut from a large parabola, arranged sequentially into reflector group 20. The closer the reflectors 200 are to the sides (e.g., reflectors a and i), the closer their cut parabola sections are to the edge. Since using the edge portion of the parabola for reflection causes distortion, this distortion can be offset by the distortion caused by the oblique view of the pyroelectric infrared sensor 1, thereby improving the working accuracy of the infrared intrusion detector. In the case of a sequential arrangement, as shown... Figure 3 As shown, the central axis of the reflecting surface of the rightmost reflector a is located on the rightmost side, and the central axis of the reflecting surface of the leftmost reflector a is located on the leftmost side. For each reflector 200, infrared light is incident along the central axis and converges to the vicinity of the focal point after being reflected approximately along the central axis. In this case, each reflector 200 needs to make full use of the part located near the vertex of the parabola. This cannot compensate for the distortion caused by the oblique view of the pyroelectric infrared sensor 1. Therefore, the infrared intrusion detector using the forward arrangement of reflectors 200 will have a distortion in the shape of the detection area 201 when in use, which will affect the working accuracy.

[0059] In specific implementation, multiple mirrors 200 belonging to the same mirror group 20 are aligned along the first direction, or multiple mirrors 200 belonging to the same mirror group 20 are staggered along the first direction.

[0060] In other words, in actual implementation, multiple reflectors 200 belonging to the same reflector group 20 can be aligned or misaligned along the first direction. The misalignment can be small or large, such as being arranged in multiple layers along the first direction. This is beneficial to improving the flexibility of the reflector arrangement, so that the reflectors 200 can be reasonably arranged according to the internal space of the infrared intrusion detector. This is conducive to achieving a structural layout in a compact space and has a positive significance for reducing the size of the detector.

[0061] In practical implementation, the first direction is perpendicular to the second direction, and the third direction is perpendicular to both the first and second directions. The reflector array 2 and the pyroelectric infrared sensor 1 are spaced apart along the third direction. Multiple reflectors 200 belonging to the same reflector group 20 are aligned along the third direction, or they are staggered along the third direction. That is, the multiple reflectors 200 of the reflector group 20 can be aligned or misaligned (staggered) along the third direction. Of course, the degree of misalignment can be small or large (e.g., divided into two layers along the third direction).

[0062] In order to ensure the consistency of the size of the detection area 201 of the reflection and reduce the mutual occlusion between the reflectors 200, in a preferred embodiment, multiple reflectors 200 belonging to the same reflector group 20 are arranged sequentially along an arc trajectory, with the arc trajectory protruding in a third direction.

[0063] In one optional embodiment, the pyroelectric infrared sensor 1 is a four-element dual-channel sensor, which includes two detection channels. Each detection channel includes a positive pyroelectric detector element 11 and a negative pyroelectric detector element 11. Each reflector group 20 reflects the received infrared light to one of the two detection channels. The detection channels corresponding to any two adjacent reflector groups 20 are different, and the detection areas 201 corresponding to any two adjacent reflector groups 20 are spaced apart.

[0064] In another optional embodiment, the pyroelectric infrared sensor 1 includes two binary single-channel sensors, each of which includes a positive pyroelectric detector element 11 and a negative pyroelectric detector element 11. Each reflector group 20 reflects the received infrared light to one of the two binary single-channel sensors. The binary single-channel sensors corresponding to any two adjacent reflector groups 20 are different, and the detection areas 201 corresponding to any two adjacent reflector groups 20 are spaced apart.

[0065] like Figures 7 to 9As shown, the pyroelectric infrared sensor 1 in this embodiment of the invention can be a quaternary two-channel sensor or a binary single-channel sensor. By selectively cooperating each reflector group 20 with two detection channels, any two adjacent reflector groups 20 can be cooperated with different detection channels, and the detection areas 201 of any two adjacent reflector groups 20 are spaced apart. Thus, as... Figure 9 As shown, when a person enters the detection area, due to their height, they may simultaneously cover two or more detection zones 201, triggering both detection channels. This indicates an intruder has been detected. However, when a pet enters the detection area, due to its shorter height, it can only cover one detection zone 201 at a time. Therefore, both detection channels cannot be triggered simultaneously, indicating that it is not an intruder but a pet or other small animal, thus achieving pet-proof protection. Infrared intrusion detectors using this configuration can distinguish between intruders and pets, effectively reducing false triggering caused by pets. Combined with the aforementioned reflector arrangement, it reduces image distortion in each detection zone, thereby effectively improving the detector's pet-proof performance.

[0066] In this embodiment, the infrared intrusion detector also includes a housing 3, with the pyroelectric infrared sensor 1 and the reflector array 2 all installed inside the housing 3. The housing 3 has a window 31 for allowing infrared light to pass through, and the window 31 extends to at least two adjacent surfaces of the housing 3. Figure 2 and Figure 3 It can be seen that, in order to ensure better light reflection, the multiple reflectors 200 arranged in a forward sequence have a larger arc, forming a bowl-shaped structure. In contrast, the multiple reflectors 200 arranged in a reverse sequence have a smaller arc, more closely resembling a linear arrangement, to also ensure better light reflection. To ensure successful acquisition of incident infrared light from the surrounding environment using the reverse sequence arrangement, such as… Figure 6 As shown, the window 31 on the housing 3 of the infrared intrusion detector, which adopts a reverse arrangement, has a larger size, such as... Figure 5 As shown, in a preferred embodiment, it extends at least to two adjacent surfaces of the housing 3. The window 31, as its name suggests, is designed to allow infrared light to pass through. In practice, it can be made of various materials, as long as it has high transmittance for infrared light, such as PE or HDPE. The color can be translucent milky white, milky white, black, gray, etc. The processing can be facilitated by injection molding, thus ensuring the structural integrity. Additionally, as... Figure 5As shown, the infrared intrusion detector can also include other structures in specific implementations, such as a PCB board 5, which is fixedly installed inside the housing 3; a reflector fixing structure 4, which is fixed on the housing 3 or the PCB board 5 and fixes the reflector array 2 through it; a pyroelectric infrared sensor 1 installed on the PCB board 5; an indicator light 6 on the PCB board 5, which can indicate the working status of the infrared intrusion detector (such as power on / off status, whether a target has been detected and a response has been generated); and a light guide column 7 on the housing 3, which is set corresponding to the indicator light 6, so as to better guide the light generated by the indicator light 6 to the outside of the housing 3. In a preferred embodiment, the infrared intrusion detector further includes a camera module and / or a microwave module, which can be used in conjunction with a pyroelectric infrared sensor to better detect the surrounding environment. The infrared intrusion detector also includes: a battery module for powering the infrared intrusion detector; a wireless communication module for signal transmission with external devices; an anti-obstruction module for responding promptly when the infrared intrusion detector is obstructed to prevent the infrared intrusion detector from malfunctioning; an anti-tamper switch for responding after the infrared intrusion detector is disassembled or removed from its installation position to improve the security of the infrared intrusion detector; and wiring terminals for electrical connection to an external power source or other devices.

[0067] The infrared intrusion detector of the present invention will be described below with reference to a specific embodiment:

[0068] For passive infrared intrusion detectors, a Fresnel lens array or a mirror array 2 is required to modulate and amplify the signal. The optical system of an infrared intrusion detector using a mirror array 2 suffers from aberrations during use, weakening the effective signal (especially at large horizontal field of view), reducing the signal-to-noise ratio, and resulting in low detection accuracy, insufficient sensitivity, and poor anti-interference capabilities. This makes it difficult for infrared intrusion detectors to meet industry standards like EN-Grade 3 or pet-proof requirements (preventing the detector from being triggered when a pet enters the protected area). Related infrared intrusion detector technologies cannot solve the problems of low detection accuracy and poor sensitivity. To improve pet-proof capabilities, some technologies use a mask to limit the pet's signal. This design has at least the following drawbacks:

[0069] 1) One more component has been added;

[0070] 2) The purpose of the mask is to reduce the pet's signal, but it also reduces the human signal. Even if the attenuation of the pet's signal is greater than that of the human signal, it still objectively reduces the absolute value of the human signal.

[0071] 3) If there are processing or assembly deviations in the mask, the effective signal will be further reduced.

[0072] The applicant discovered that for infrared intrusion detectors employing mirror array 2, the aberrations are mainly manifested in distortion and warping. To address these issues, embodiments of the present invention provide an infrared intrusion detector.

[0073] like Figure 1 As shown, Figure 1 The diagram only shows the optical paths of the leftmost and rightmost fields of view for illustrative purposes. In reality, when there are nine reflectors 200 forming a reflector group 20, there will be optical paths for nine fields of view. In this embodiment, each reflector 200 in the reflector group 20 is arranged in reverse order. This reverse order arrangement is different from the forward order arrangement. The terms "forward order" and "reverse order" are merely definitions to distinguish between two design approaches and do not have any other limiting meaning. The terms "forward order" and "reverse order" refer to the arrangement on the horizontal axis (…). Figure 1 The first direction (corresponding to the second direction) of the mirror array is not emphasized in terms of the vertical direction (the first direction).

[0074] Compared to a design using a forward-order arrangement, employing a reverse arrangement of 200 reflectors offers the following technical advantages:

[0075] When using a sequential arrangement design, as the FOV angle increases, the detection area 201 formed by the reflector 200 will experience distortion and aberration (mainly due to the slant of the pyroelectric infrared sensor 1), such as... Figure 7 As shown in the upper part, each reflector 200 forms its own detection zone (detection area 201). When nine reflectors 200 are arranged horizontally, nine detection zones are formed accordingly. In a forward-order arrangement, as the field of view (FOV) angle increases, the distortion and warping of the detection zones also increase, resulting in inconsistent shapes among the horizontally arranged zones. This can cause objects to be detected in areas where they should not be detected, or vice versa, leading to false triggering or no response. When a reverse-order arrangement is used, distortion and warping can be effectively suppressed, ensuring that the detection zones (detection areas 201) formed by the horizontally arranged reflectors 200 have a basically consistent shape. Figure 7 As shown in the lower half of the diagram, this effectively avoids issues such as accidental triggering or failure to trigger.

[0076] Figure 5The following is a schematic diagram of the infrared intrusion detector according to an embodiment of the present invention: The infrared intrusion detector has a housing 3, on which a window 31 allows far-infrared light to pass through. The window 31 is generally made of PE material, or more specifically, HDPE material, and the color can be translucent milky white, milky white, black, gray, etc. The manufacturing process can be injection molding or other methods. The far-infrared signal enters the reflector array 2 through the window 31, and the reflector array 2 focuses the infrared light onto the pyroelectric infrared sensor 1. Each reflector 200 of the reflector array 2 can be made of ABS material, and after injection molding, its surface is electroplated to have a high reflectivity for far-infrared signals. The reflector 200 can be fixed on the PCB board 5 or on the housing 3. The pyroelectric infrared sensor 1 (sensor) is mounted on the PCB board 5, which also includes a module for processing the signal from the sensor. The infrared intrusion detector can also be equipped with an indicator light 6, which can send out light signals through a light guide column 7 or through the window 31. Infrared intrusion detectors may also include a camera module (for recording images, enriching detection functions or improving detection reliability), a microwave module (for microwave detection, enriching detection functions or improving detection reliability), a battery module (for power supply), an anti-obstruction module (to trigger an alarm when the field of view is obstructed), a wireless communication module, an anti-tamper switch (to trigger an alarm when the detector is tampered with, improving detector security), and wiring terminals, among other structures.

[0077] A schematic diagram of mirror array 2 is shown below. Figure 4 As shown, it includes multiple mirror groups 20, and each mirror group 20 includes multiple mirrors 200. Figure 4 In this embodiment, the reflector array 20 is divided into three layers in the vertical direction (first direction): the bottom layer has seven reflectors, the second-to-last layer also has seven reflectors, and the top layer has five reflectors. It should be noted that different reflector array 2 designs will have different horizontal and vertical partitions, and the number can be flexibly selected according to actual needs. The vertical partitions of the reflector array 2 generally represent different vertical detection distances; the bottom layer detects the farthest point in the protected area, the second-to-last layer detects the next farthest point, and so on, with the top layer detecting the closest point.

[0078] In addition, it should be noted that the shape of each reflector 200 of the infrared intrusion detector in this embodiment of the invention can be arbitrary, such as rectangular, honeycomb, irregular shape, etc.

[0079] like Figure 8As shown, the pyroelectric infrared sensor 1 of the infrared intrusion detector in this embodiment of the invention can be a quadruple dual-channel sensor or two binary single-channel sensors. The two channels of the dual-channel sensor are vertically distributed during use. The logic for using a dual-channel sensor is that a person standing or walking is taller, so signals can be generated in both channels simultaneously; while a pet is shorter and cannot generate signals in both channels simultaneously. Similarly, two single-channel sensors can be used instead of a dual-channel sensor. In this case, the protection zones generated by the two channels are as follows... Figure 9 As shown, each reflector group 20 is selectively matched with two detection channels, so that any two adjacent reflector groups 20 are matched with different detection channels, and the detection areas 201 of any two adjacent reflector groups 20 are set at intervals. The detection areas 201 corresponding to the two channels do not overlap in the vertical direction (i.e., they are set at intervals; if they overlap, the pet prevention logic cannot be implemented), and they appear alternately.

[0080] like Figure 6 As shown, due to the reverse arrangement of the reflectors 200, the opening of the window 31 on the housing 3 is much larger than that in the forward arrangement. The reflectors 200 in the forward arrangement are arranged in a bowl shape, while those in the reverse arrangement are almost in a straight line, determined by the optical path. In actual implementation, it is easy to identify whether a reverse arrangement of the reflectors has been used from the product's shape and the shape of the reflector 200 arrangement. For example, check if the exterior features a large window design, especially if the window extends to at least two sides of the housing 3; another example is whether the horizontal arrangement of the reflectors 200 in the reflector group 20 is not bowl-shaped but tends towards a straight line; yet another example is to block some reflectors 200 to see which protected area is blinded, which is also the most accurate method.

[0081] The infrared intrusion detector proposed in this embodiment of the invention uses a reverse arrangement of the reflector array 2 of the passive infrared detector in the horizontal direction. This reverse arrangement, compared to the forward arrangement, eliminates distortion and warping of the detection zone in the large field of view, resulting in a more consistent zone shape in the horizontal direction and improving the detection accuracy of the infrared intrusion detector. Based on this design, the product can better prevent pets from entering based on height characteristics, reducing the common-mode effect (caused by zone distortion, where light reflected by the reflector 200 simultaneously illuminates both pyroelectric detector elements 11 of one channel of the pyroelectric infrared sensor 1, resulting in no response from the pyroelectric infrared sensor 1). This ultimately improves the product's pet-prevention performance and enhances the accuracy and sensitivity of human detection, thus boosting the product's performance. In actual use, the infrared intrusion detector with the above-described structure can simultaneously meet the EN50131-2-4G3 standard at a distance of 16 meters and a 90° field of view, as well as the immunity function for pets weighing up to 25 kg, demonstrating good practical performance.

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

[0083] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0084] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0085] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An infrared intrusion detector, characterized in that, include: A pyroelectric infrared sensor (1) has a photosensitive surface (10). A mirror array (2) includes multiple mirror groups (20), which are arranged sequentially along a first direction; along a second direction, each mirror group (20) includes a first side portion (21), a middle portion (22), and a second side portion (23); both the first side portion (21) and the second side portion (23) include at least one mirror (200), the reflecting surface of which is at least a part of a parabola, and the mirror (200) reflects and converges infrared light onto the photosensitive surface (10). Wherein, the angle between the central axis of the parabola on which at least one of the reflectors (200) of the first side portion (21) is located and the second direction is an acute angle, and / or, the angle between the central axis of the parabola on which at least one of the reflectors (200) of the second side portion (23) is located and the second direction is an obtuse angle.

2. The infrared intrusion detector according to claim 1, characterized in that, Along the second direction, the pyroelectric infrared sensor (1) is located between the first side portion (21) and the second side portion (23).

3. The infrared intrusion detector according to claim 1, characterized in that, Along the direction close to the middle portion (22), the angle between the central axis of the parabola on which each of the reflectors (200) of the first side portion (21) is located and the second direction gradually increases; and / or, along the direction close to the middle portion (22), the angle between the central axis of the parabola on which each of the reflectors (200) of the second side portion (23) is located and the second direction gradually decreases.

4. An infrared intrusion detector, characterized in that, include: A pyroelectric infrared sensor (1) has a photosensitive surface (10). A mirror array (2) includes multiple mirror groups (20), which are arranged sequentially along a first direction. Each mirror group (20) includes multiple mirrors (200). Multiple mirrors (200) belonging to the same mirror group (20) are arranged sequentially along a second direction to reflect and converge infrared light from multiple directions onto the photosensitive surface (10) through the multiple mirrors (200). The reflecting surface of each mirror (200) is at least a part of a parabolic surface. In this arrangement, at least one of the reflectors (200) of the reflector group (20) is arranged in reverse order. Along the second direction, the reflector (200) arranged in reverse order is located on one side of the pyroelectric infrared sensor (1) and reflects infrared light from the pyroelectric infrared sensor (1) on the same side along the second direction to the photosensitive surface (10).

5. The infrared intrusion detector according to claim 4, characterized in that, All the reflectors (200) located on both sides of the pyroelectric infrared sensor (1) along the second direction are arranged in the reverse order. Alternatively, among the multiple reflectors (200) belonging to the same reflector group (20), some reflectors (200) are arranged in the reverse order, and other reflectors (200) are arranged in the forward order. Along the second direction, the reflectors (200) arranged in the forward order are located on one side of the pyroelectric infrared sensor (1) and reflect infrared light from the opposite side of the pyroelectric infrared sensor (1) along the second direction to the photosensitive surface (10). Along the second direction, the reflectors (200) arranged in the reverse order are located on both sides of the reflectors (200) arranged in the forward order.

6. An infrared intrusion detector, characterized in that, include: A pyroelectric infrared sensor (1) has a photosensitive surface (10). A mirror array (2) includes multiple mirror groups (20), which are arranged sequentially along a first direction. Each mirror group (20) includes multiple mirrors (200). Multiple mirrors (200) belonging to the same mirror group (20) are arranged sequentially along a second direction to reflect and converge infrared light from multiple directions onto the photosensitive surface (10) through the multiple mirrors (200). The reflecting surface of each mirror (200) is at least a part of a parabolic surface. In this arrangement, at least one of the reflectors (200) of the reflector group (20) is arranged in reverse order. Along the second direction, the reflector (200) arranged in reverse order is located on one side of the pyroelectric infrared sensor (1), and the opening of the parabolic surface on which its reflective surface is located faces the same side as the pyroelectric infrared sensor (1).

7. The infrared intrusion detector according to claim 6, characterized in that, All the reflectors (200) located on both sides of the pyroelectric infrared sensor (1) along the second direction are arranged in the reverse order; or, among the multiple reflectors (200) belonging to the same reflector group (20), some of the reflectors (200) are arranged in the reverse order, and the other part of the reflectors (200) are arranged in the forward order. Along the second direction, the reflectors (200) arranged in the forward order are located on one side of the pyroelectric infrared sensor (1), and the opening of the parabolic surface on which their reflective surface is located faces the opposite side of the pyroelectric infrared sensor (1). Along the second direction, the reflectors (200) arranged in the reverse order are located on both sides of the reflectors (200) arranged in the forward order.

8. The infrared intrusion detector according to claim 1, 4, or 6, characterized in that, Multiple mirrors (200) belonging to the same mirror group (20) are aligned along the first direction, or multiple mirrors (200) belonging to the same mirror group (20) are staggered along the first direction.

9. The infrared intrusion detector according to claim 1, 4, or 6, characterized in that, The first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction. The reflector array (2) and the pyroelectric infrared sensor (1) are spaced apart along the third direction. The multiple reflectors (200) belonging to the same reflector group (20) are aligned along the third direction, or the multiple reflectors (200) belonging to the same reflector group (20) are misaligned along the third direction.

10. The infrared intrusion detector according to claim 9, characterized in that, Multiple mirrors (200) belonging to the same mirror group (20) are arranged sequentially along an arc trajectory, the arc trajectory protruding in the third direction.

11. The infrared intrusion detector according to claim 1, 4, or 6, characterized in that, The pyroelectric infrared sensor (1) is a four-element dual-channel sensor. The four-element dual-channel sensor includes two detection channels. Each detection channel includes a positive pyroelectric detector element and a negative pyroelectric detector element. Each of the reflector groups (20) reflects the received infrared light to one of the two detection channels. The detection channels corresponding to any two adjacent reflector groups (20) are different, and the detection areas (201) corresponding to any two adjacent reflector groups (20) are spaced apart.

12. The infrared intrusion detector according to claim 1, 4, or 6, characterized in that, The pyroelectric infrared sensor (1) includes two binary single-channel sensors. Each binary single-channel sensor includes a positive pyroelectric detector element and a negative pyroelectric detector element. Each of the reflector groups (20) reflects the received infrared light to one of the two binary single-channel sensors. The binary single-channel sensors corresponding to any two adjacent reflector groups (20) are different, and the detection areas (201) corresponding to any two adjacent reflector groups (20) are spaced apart.

13. The infrared intrusion detector according to claim 1, 4, or 6, characterized in that, The infrared intrusion detector includes a housing (3), the pyroelectric infrared sensor (1) and the reflector array (2) are all installed inside the housing (3), and the housing (3) is provided with a window (31) for infrared light to pass through, the window (31) extending to at least two adjacent surfaces of the housing (3).

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