Lens suitable for low-installation-height lower side installation detection and infrared detection device

Abstract

The invention provides a lens suitable for low-installation-height lower side installation detection and an infrared detection device, the lens is provided with a first light condensation area and a second light condensation area which are arranged up and down in a side installation use state, and the area ratio of the second light condensation area to the lens is larger than 50%. Wherein the first light gathering area is used for forming a forward view field in the side installation use state of the lens, and the second light gathering area is used for forming a forward downward view field in the side installation use state of the lens, so that the lens can be installed at the installation height of 2 meters and below. Therefore, the human body which moves in the forward view field direction and radially moves relative to the infrared detection device can generate a tangential movement component in the forward downward view field, and the radial sensitivity of the infrared detection device is guaranteed based on the high area proportion of the second light condensation area in the lens.

Description

Technical Field

[0001] The present invention relates to the field of infrared detection, and more particularly to a lens and an infrared detection device suitable for detection at the bottom of a low installation height. Background Art

[0002] Among the existing technologies for detecting human presence, the most commonly used and mature human presence detection technology is to use a pyroelectric infrared sensor (PIR) to detect the cross-zone movement of the human body within the detection area based on the partitioning of the corresponding detection area by a Fresnel lens. The corresponding infrared detection device corresponds to Figure 1 The structural principle includes a Fresnel lens 10P and a pyroelectric infrared sensor 20P, wherein the pyroelectric infrared sensor 20P in a binary form is exemplified, wherein the pyroelectric infrared sensor 20P includes a positive temperature-sensitive surface 21P and a negative temperature-sensitive surface 22P arranged in parallel, the Fresnel lens 10P has a light-incoming surface 101P and a lens array composed of a plurality of lens units 11P formed on a surface opposite to the light-incoming surface 11P based on a corresponding texture design, wherein each of the lens units 11P is The element 11P has a focusing characteristic like a convex lens, and the pyroelectric infrared sensor 20P is arranged with the positive temperature-sensitive surface 21P and the negative temperature-sensitive surface 22P facing the side of the Fresnel lens 10P opposite to the light-incoming surface 101P. Then, according to the focusing principle of the convex lens, in the field of view 100 corresponding to any one of the lens units 11P, the positive temperature-sensitive surface 21P and the negative temperature-sensitive surface 22P form two temperature-sensing spaces through the lens unit 11P, and the positive temperature-sensitive surface 21P and the negative temperature-sensitive surface 22P form two temperature-sensing spaces through the lens unit 11P. The temperature-sensing space formed by the mirror unit 11P is a bright area, and the temperature-sensing space formed by the negative temperature-sensing surface 22P through the lens unit 11P is a dark area. There is also a blind area between the bright area and the dark area. The infrared light emitted by the human body in the bright area can be converged to the positive temperature-sensing surface 21P through the lens unit 11P, causing the pyroelectric infrared sensor 20P to generate a positive voltage. The infrared light emitted by the human body in the dark area can be converged to the negative temperature-sensing surface 22P through the lens unit 11P, causing the pyroelectric infrared sensor 20P to generate a negative voltage. In this way, the pyroelectric infrared sensor 20P can form a corresponding number of the fields of view 100 through the lens array of the Fresnel lens 10P, thereby forming a corresponding number of bright areas and dark areas and a blind area defined between the bright areas and the dark areas. When the human body crosses the area between any two areas among the bright area, the dark area and the blind area, a corresponding infrared light spot is formed, which crosses the boundary displacement on the corresponding temperature-sensing surface, and the cross-area movement of the human body can be detected based on the corresponding electrical signal change.

[0003] According to the above-mentioned working principle of the infrared detection device, since the movement of the human body relative to the infrared detection device in the radial direction (along the aforementioned field of view direction) is difficult to form a corresponding cross-border displacement of the infrared spot on the corresponding temperature-sensing surface, the corresponding infrared detection device generally has a lower radial sensitivity. Therefore, for the actual application of the infrared detection device, the current infrared detection device is mainly used in vertical detection scenarios in a top-mounted manner at an installation height greater than 3 meters, and the top-mounted manner is used to ensure the movement component of the human body's movement in the tangential direction at an installation height greater than 3 meters, which correspondingly ensures the sensitivity of the infrared detection device in actual use. Even if the infrared detection device is applied to the side detection scene in a side-mounted manner, it is mainly used in scenarios where the human body's movement is mainly manifested as movement in the tangential direction. For example, when the infrared detection device is installed on the wall of a corridor in a side-mounted manner, the human body's movement along the corridor is mainly manifested as movement in the tangential direction. The corresponding infrared detection device has a higher detection sensitivity for the human body's movement along the corridor, but has a lower detection sensitivity for the human body's movement when crossing or entering the corridor horizontally.

[0004] Therefore, for ordinary consumers, due to a lack of understanding of the working principles of infrared detection devices, current direct-to-consumer infrared detection device products are very likely to cause consumers to question the stability of the product due to unreasonable installation methods and angles. This is why, despite the high penetration rate of current infrared detection devices, major manufacturers still maintain a relatively conservative attitude towards the development of direct-to-consumer infrared detection device products. In view of this, developing an infrared detection device that is suitable for ordinary consumers in terms of installation height and installation method, and can simplify product installation conditions by taking into account both radial sensitivity and tangential sensitivity, is of great significance and commercial value for the popularization of infrared detection devices at the consumer level. Summary of the Invention

[0005] One object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein the infrared detection device is suitable for side-mounted detection at a low installation height to simplify product installation requirements, and can obtain good radial sensitivity and tangential sensitivity based on a side-mounted method at a low installation height, which is conducive to obtaining a stable detection sensitivity experience, and therefore has important significance and commercial value for the popularization of the infrared detection device at the consumer level.

[0006] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein the infrared detection device is suitable for side-mounted detection at an installation height of 2 meters or less, and can obtain good radial sensitivity and tangential sensitivity based on a side-mounted method at an installation height of 2 meters or less, thereby reducing the consumer's installation learning cost for the infrared detection device and improving the consumer's experience with the infrared detection device.

[0007] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein the lens is suitable as a passive infrared detection lens and includes a first focusing area and a second focusing area arranged vertically in a side-mounted state. The first focusing area includes a plurality of first lens units arranged horizontally, and the second focusing area accounts for more than 50% of the area of ​​the lens and includes a plurality of second lens units arranged horizontally. Each of the first lens units and each of the second lens units has a focusing characteristic and is designed to have a focal length that can match the same pyroelectric infrared sensor mounting position. The first focusing area is used to form a forward field of view in the side-mounted state of the lens, and the corresponding second focusing area is used to form a front-down field of view in the side-mounted state of the lens. In this way, at an installation height of 2 meters or less, a human body moving in the forward field of view and radially moving relative to the infrared detection device can generate a tangential movement component in the front-down field of view, thereby ensuring the radial sensitivity of the infrared detection device based on the high area ratio of the second focusing area to the lens.

[0008] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein, in the side-mounted state of the lens, the plane defined by the pyroelectric infrared sensor mounting position and the optical centers of any two first lens units is a horizontal plane, and the optical center of each second lens unit is designed to satisfy: the inclination angle of the line connecting the optical center of each second lens unit and the pyroelectric infrared sensor mounting position relative to the horizontal plane is greater than or equal to 10°. In this way, in the side-mounted state of the lens, the change in the blind spot height between the forward field of view and the forward and downward field of view in the forward field of view direction (the radial direction of the infrared detection device) is ensured. Corresponding to an installation height of 2 meters or less, the blind spot space occupied by a human body moving in the forward field of view direction and radially relative to the infrared detection device has a large change, which is beneficial to improving the signal strength generated by the corresponding pyroelectric infrared sensor based on the change in infrared light intensity, thereby forming an equivalent improvement in the radial sensitivity of the infrared detection device.

[0009] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein the optical center design of each first lens unit and each second lens unit satisfies the following requirements: there is only one optical center of the second lens unit between two planes passing through the optical centers of any two adjacent first lens units and perpendicular to the line connecting the optical centers of the two first lens units. In this way, when the lens is installed on the side and used, the forward field of view corresponding to each first lens unit is located in the upper space of the blind spot between the corresponding two forward and downward fields of view. Corresponding to an installation height of 2 meters or less, based on the complementarity of the forward field of view and the forward and downward field of view in the tangential direction, the tangential resolution of the infrared detection device is improved.

[0010] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein in the side-mounted use state of the lens, the tangential resolution of the infrared detection device is improved based on the complementarity of the forward field of view and the front-downward field of view in the tangential direction. Corresponding to an installation height of 2 meters or less, the accompanying tangential micro-motion generated by the movement of the human body moving in the direction of the forward field of view and radially relative to the infrared detection device can be effectively detected, thereby forming an equivalent improvement in the radial sensitivity of the infrared detection device.

[0011] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low mounting height, wherein the lens is suitable as a passive infrared detection lens and has a light-entry surface and a light-exiting surface opposite to the light-entry surface, wherein the first focusing area and the second focusing area are arranged up and down to directly face the light-entry surface or the light-exiting surface of the lens, and the second lens unit in the second focusing area has an optical center distribution with a high middle and low sides, so as to be suitable for the side-mounted use state of the lens, so that the projection distribution of the front and downward field of view corresponding to each second lens unit on the ground corresponds to the projection of the light and dark areas staggered along the fan ring, which is beneficial to enhance the tangential movement component of the human body moving in the direction along the side mounting surface of the lens and perpendicular to the side mounting surface of the lens in the front and downward field of view, thereby enhancing the radial sensitivity of the infrared detection device in the side-mounted use state.

[0012] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein the lens also includes a third focusing area arranged below the second focusing area in a side-mounted use state, wherein the third focusing area includes a plurality of third lens units arranged left and right, each of the third lens units has a focusing characteristic and is designed with a focal length that can match the aforementioned pyroelectric infrared sensor installation position, so that in the side-mounted use state of the lens, a near-zone field of view corresponding to the third focusing area is formed in the downward space of the front downward field of view corresponding to the second focusing area, corresponding to an installation height of 2 meters or less, further enabling the infrared detection device to detect children moving in the downward space of the front downward field of view corresponding to the second focusing area and a human body in a squatting state.

[0013] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein in the side-mounted use state of the lens, the optical centers of the third lens units arranged on the left and right are designed to be staggered in height, so that under the appropriate area limit of the third focusing area, the angular span between the near-field of view corresponding to each third lens unit in the forward field of view is improved, and at the same time, the near-field of view corresponding to each third lens unit is complemented in the tangential direction, so that the infrared detection device can obtain good radial sensitivity and tangential sensitivity in the downward space of the front downward field of view corresponding to the second focusing area based on the side-mounted method at an installation height of 2 meters or less.

[0014] Another object of the present invention is to provide a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein when the first focusing area and the second focusing area are arranged up and down, the pyroelectric infrared sensor of the infrared detection device is arranged at a position upwardly deviated from the center of the lens with its temperature-sensitive surface facing the light-emitting surface of the lens, so that when the infrared detection device is installed on the side, the initial direction of the forward field of view corresponding to the first focusing area can be close to or directly forward-pointing, thereby avoiding large-angle flipping adjustment of the infrared detection device in the side-mounted state, which is conducive to simplifying the installation requirements of the infrared detection device and improving the aesthetics of the infrared detection device in the side-mounted state.

[0015] Another object of the present invention is to provide a lens and an infrared detection device suitable for detection on the lower side of a low installation height, wherein when the first focusing area and the second focusing area are arranged up and down, the pyroelectric infrared sensor of the infrared detection device is set at a position upwardly deviated from the center of the lens with its temperature-sensitive surface tilted downward toward the light-emitting surface of the lens. In this way, when the pyroelectric infrared sensor of the infrared detection device is upwardly deviated from the center of the lens, the light loss of the temperature-sensitive surface of the pyroelectric infrared sensor to the second focusing area is reduced, which is correspondingly beneficial to ensuring the radial sensitivity of the infrared detection device.

[0016] To achieve at least one of the above objectives, according to one aspect of the present invention, there is provided a lens suitable for side-mounted detection at a low installation height, wherein the lens is suitable for use as a lens of an infrared detection device and has a light-incoming surface and a light-outgoing surface opposite to the light-incoming surface, wherein the light-incoming surface of the lens is directly facing the side-mounted detection device in a state of use, and the lens comprises:

[0017] a first light focusing area, the first light focusing area including a plurality of first lens units arranged left and right; and

[0018] A second focusing area, which is arranged below the first focusing area, wherein the second focusing area accounts for more than 50% of the area of ​​the lens and includes a plurality of second lens units arranged left and right, each of the first lens unit and each of the second lens units has a focusing characteristic and is designed with a focal length that can match the same pyroelectric infrared sensor mounting position, wherein the first focusing area is used to form a forward field of view when the infrared detection device is installed on the side of the device, and the corresponding second focusing area is used to form a front downward field of view when the infrared detection device is installed on the side of the device.

[0019] In one embodiment, when the infrared detection device is in a side-mounted state of use, the plane defined by the pyroelectric infrared sensor mounting position and the optical centers of any two first lens units is a horizontal plane, and the optical center of each second lens unit is designed to satisfy the following requirement: the inclination angle of the line between the optical center of each second lens unit and the pyroelectric infrared sensor mounting position relative to the horizontal plane is greater than or equal to 10°.

[0020] In one embodiment, the optical centers of each of the first lens units and each of the second lens units are designed to satisfy the following requirement: there is only one optical center of the second lens unit between two planes passing through the optical centers of any two adjacent first lens units and perpendicular to a line connecting the optical centers of the two first lens units.

[0021] In one embodiment, the first light-focusing area and the second light-focusing area are arranged vertically to face the light-incoming surface of the lens, and the second lens unit in the second light-focusing area has an optical center distribution that is high in the middle and low on both sides.

[0022] In one embodiment, the lens further includes a third focusing area arranged below the second focusing area, wherein the third focusing area includes a plurality of third lens units arranged left and right, each of the third lens units has a focusing characteristic and is designed with a focal length that can match the mounting position of the pyroelectric infrared sensor, so that when the infrared detection device is installed and used on the side, a near-field of view corresponding to the third focusing area is formed in the downward space of the front downward field of view corresponding to the second focusing area.

[0023] In one embodiment, the first light-focusing area and the second light-focusing area are arranged vertically to face the light-incident surface of the lens, and the optical centers of the third lens units arranged left and right are designed to be staggered in height.

[0024] In one embodiment, the number of the third lens units is an odd number, and when the first light-focusing area and the second light-focusing area are arranged vertically and face the light-incident surface of the lens, the optical center height of the odd-numbered third lens unit is higher than the optical center height of the adjacent third lens unit from left to right.

[0025] In one embodiment, in a state where the first focusing area and the second focusing area are arranged up and down to face the light incident surface of the lens, in order from left to right, the odd-numbered third lens units are configured to have an optical center distribution with a high middle and low sides.

[0026] In one embodiment, in a state where the first light focusing area and the second light focusing area are arranged vertically, the optical center of each first lens unit is set to be lower than the lower boundary of the first lens unit to which it belongs.

[0027] According to another aspect of the present invention, the present invention further provides an infrared detection device, comprising:

[0028] a base, wherein the infrared detection device has the bottom surface of the base as a side mounting surface;

[0029] a housing, wherein the housing is movably and adjustably disposed at an end of the base opposite to the bottom surface thereof, and the housing defines a receiving cavity and an opening communicating with the receiving cavity;

[0030] a pyroelectric infrared sensor, the pyroelectric infrared sensor being disposed in the accommodating cavity with its temperature-sensing surface facing the opening; and

[0031] A lens, wherein the lens has a light-entry surface and a light-exiting surface opposite to the light-entry surface, and is arranged at the opening with its light-exiting surface facing the opening of the accommodating cavity, wherein the light-entry surface of the lens is directly facing the light-entry surface when the infrared detection device is installed on the side. The lens includes a first light-focusing area and a second light-focusing area arranged vertically, wherein the first light-focusing area includes a plurality of first lens units arranged on the left and right, and the second light-focusing area accounts for more than 50% of the area of ​​the lens and includes a plurality of second lens units arranged on the left and right, each of the first lens units and each of the second lens units has a light-focusing characteristic and is designed to match the pyroelectric infrared sensor in terms of focal length, wherein the first light-focusing area is used to form a forward field of view when the infrared detection device is installed on the side, and the corresponding second light-focusing area is used to form a front downward field of view when the infrared detection device is installed on the side.

[0032] In one embodiment, the optical centers of each of the first lens units and each of the second lens units are designed to satisfy the following requirement: there is only one optical center of the second lens unit between two planes passing through the optical centers of any two adjacent first lens units and perpendicular to a line connecting the optical centers of the two first lens units.

[0033] In one embodiment, the lens further includes a third focusing area arranged below the second focusing area, wherein the third focusing area includes a plurality of third lens units arranged left and right, each of the third lens units has a focusing characteristic and is designed with a focal length that can match the mounting position of the pyroelectric infrared sensor, so that when the infrared detection device is installed and used on the side, a near-field of view corresponding to the third focusing area is formed in the downward space of the front downward field of view corresponding to the second focusing area.

[0034] In one embodiment, the first light-focusing area and the second light-focusing area are arranged vertically to face the light-incident surface of the lens, and the optical centers of the third lens units arranged left and right are designed to be staggered in height.

[0035] In one embodiment, the lens and the housing are set to the same color as white.

[0036] In one embodiment, when the infrared detection device is in a side-mounted use state, the plane defined by the pyroelectric infrared sensor and the optical centers of any two of the first lens units is a horizontal plane, and the optical center of each of the second lens units is designed to satisfy the following requirement: the inclination angle of the line between the optical center of each of the second lens units and the pyroelectric infrared sensor relative to the horizontal plane is greater than or equal to 10°.

[0037] In one embodiment, when the first focusing area and the second focusing area are arranged vertically, the pyroelectric infrared sensor is arranged at a position upwardly offset from the center of the lens with its temperature-sensitive surface facing the light-emitting surface of the lens.

[0038] In one embodiment, the pyroelectric infrared sensor is disposed at a position upwardly offset from the center of the lens, with its temperature-sensing surface tilted downwardly toward the light-emitting surface of the lens.

[0039] In one embodiment, in a state where the first light focusing area and the second light focusing area are arranged vertically, the optical center of each first lens unit is set to be lower than the lower boundary of the first lens unit to which it belongs.

[0040] In one embodiment, the infrared detection device further includes a microwave detection module for microwave detection and disposed below the pyroelectric infrared sensor.

[0041] In one embodiment, the microwave detection module is configured to use a multi-element patch antenna as a microwave transmitting and / or receiving antenna, wherein the multi-element patch antenna includes two planar radiation sources, wherein corresponding to the viewing angles of the first focusing area and the second focusing area arranged up and down, the two planar radiation sources of the multi-element patch antenna are arranged up and down and are configured to have the same polarization direction in the left and right directions.

[0042] Further objects and advantages of the present invention will be fully apparent from an understanding of the following description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structural principle of an existing infrared detection device.

[0044] Figure 2A FIG. 4 is a schematic structural diagram of a lens according to an embodiment of the present invention.

[0045] Figure 2B Schematic diagram of the structural principle of the lens according to the above embodiment of the present invention when applied to an infrared detection device.

[0046] Figure 2C The figure is a schematic diagram of a side-mounted usage scenario of the lens according to the above embodiment of the present invention after being applied to an infrared detection device.

[0047] Figure 2D The figure is a schematic diagram of a field of view distribution effect of the lens according to the above embodiment of the present invention in a side-mounted usage scenario after being applied to an infrared detection device.

[0048] Figure 2EThe figure is a schematic diagram of a field of view distribution effect of the lens according to the above embodiment of the present invention in a side-mounted usage scenario after being applied to an infrared detection device.

[0049] Figure 3A FIG. 4 is a schematic structural diagram of a lens according to another embodiment of the present invention.

[0050] Figure 3B Schematic diagram of the structural principle of the lens according to the above embodiment of the present invention when applied to an infrared detection device.

[0051] Figure 3C The figure is a schematic diagram of a side-mounted usage scenario of the lens according to the above embodiment of the present invention after being applied to an infrared detection device.

[0052] Figure 3D The figure is a schematic diagram of a field of view distribution effect of the lens according to the above embodiment of the present invention in a side-mounted usage scenario after being applied to an infrared detection device.

[0053] Figure 3E The figure is a schematic diagram of a field of view distribution effect of the lens according to the above embodiment of the present invention in a side-mounted usage scenario after being applied to an infrared detection device.

[0054] Figure 4 FIG. 1 is a schematic structural diagram of an infrared detection device according to an embodiment of the present invention.

[0055] Figure 5 FIG. 4 is a schematic structural diagram of an infrared detection device according to another embodiment of the present invention.

[0056] Figure 6 Schematic diagram of the orientation adjustment application of the infrared detection device in the side-mounted state according to the above embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0058] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0059] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0060] The present invention provides a lens and an infrared detection device suitable for side-mounted detection at a low installation height, wherein the infrared detection device is suitable for side-mounted detection at an installation height of 2 meters or less, and can obtain good radial sensitivity and tangential sensitivity based on a side-mounted method at an installation height of 2 meters or less, thereby reducing consumers' installation learning costs for the infrared detection device and improving consumers' experience with the infrared detection device.

[0061] With reference to the accompanying drawings of the present invention Figures 2A to 2E As shown, the structure of a lens suitable for side-mounted detection at low installation heights according to an embodiment of the present invention and the principle of the lens in side-mounted use at an installation height of 2 meters or less are illustrated.

[0062] Specifically in this embodiment of the present invention, the lens 10 is suitable for use as the lens of the infrared detection device and has a light-incoming surface 101 and a light-outgoing surface 102 opposite to the light-incoming surface 101, wherein the side of the infrared detection device is installed in a state of use facing the light-incoming surface 101 of the lens 10, and the lens 10 corresponds to Figure 2A The lens 10 includes a first light-concentrating area 11 and a second light-concentrating area 12 arranged vertically. The first light-concentrating area 11 includes a plurality of first lens units 111 arranged horizontally. The second light-concentrating area 12 accounts for more than 50% of the area of ​​the lens 10 and includes a plurality of second lens units 121 arranged horizontally. Each of the first lens units 111 and each of the second lens units 121 has a light-concentrating characteristic and corresponds to the focal length design of the lens 10. Figure 2B Satisfy the ability to match the same pyroelectric infrared sensor 20 installation position, where Figure 2CAs shown, the first focusing area 11 is used to form a forward field of view 110 when the infrared detection device is installed on the side and used, and the corresponding second focusing area 12 is used to form a front downward field of view 120 when the infrared detection device is installed on the side and used. In this way, at an installation height of 2 meters or less, a human body moving in the direction of the forward field of view 110 and moving radially relative to the infrared detection device can generate a tangential movement component in the front downward field of view 120, thereby ensuring the radial sensitivity of the infrared detection device based on the high area ratio of the second focusing area 12 to the lens 10.

[0063] It can be understood that, based on the working principle of the aforementioned infrared detection device, the fields of view 110 and 120 corresponding to each of the lens units 111 and 121 can be defined as the projected space formed by the positive and negative temperature-sensitive surfaces of the pyroelectric infrared sensor 20 through the optical centers of each of the lens units 111 and 121.

[0064] It is worth mentioning that, based on the traditional side-mounted detection concept, the forward field of view 110 corresponding to each first lens unit 111 of the first focusing area 11 is usually used for long-distance detection in a space far away from the infrared detection device due to its forward pointing direction. The corresponding first focusing area 11 is usually designed based on the traditional side-mounted detection concept so that the lens 10 has a larger area occupancy to ensure the sensitivity of long-distance detection.

[0065] However, based on the aforementioned operating principle of the infrared detection device, it can be seen that increasing the area of ​​the first focusing zone 11 has a minimal effect on improving the infrared detection device's radial sensitivity for a person moving in the forward field of view 110 and radially relative to the infrared detection device. In other words, based on the traditional side-mounted detection concept, current designs of infrared detection devices with a large first focusing zone 11 still suffer from low radial sensitivity.

[0066] That is to say, different from the traditional side-mounted detection concept, in the lens 10 of the present invention that is suitable for side-mounted detection at a low installation height, the second focusing area 12 used to form the front downward field of view 120 in the side-mounted use state of the infrared detection device accounts for more than 50% of the area of ​​the lens 10 and has an area larger than the first focusing area 12 used to form the forward field of view 110 in the side-mounted use state of the infrared detection device. In this way, at an installation height of 2 meters or less, the human body moving in the direction of the forward field of view 110 and moving radially relative to the infrared detection device can generate a tangential movement component in the front downward field of view 120, thereby ensuring the radial sensitivity of the infrared detection device based on the high area ratio of the second focusing area 12 in the lens 10.

[0067] In addition, when the infrared detection device is installed on the side and used, for a human body moving in the direction of the forward field of view 110, although it moves radially relative to the infrared detection device and it is difficult to form a corresponding cross-border displacement of the infrared light spot on the corresponding temperature-sensing surface in the forward field of view 110, at an installation height of 2 meters or below, the radially moving human body is likely to be in the blind spots of the forward field of view 110 and the front-down field of view 120 and between the forward field of view 110 and the front-down field of view 120 at the same time. When the human body moves in the direction of the forward field of view 110, the height of the blind spot between the forward field of view 110 and the front-down field of view 120 at the human body's position will change, resulting in a change in the light intensity of the lens 10, thereby generating a corresponding change in the signal intensity of the pyroelectric infrared sensor 20, thereby forming an equivalent improvement in the radial sensitivity of the infrared detection device.

[0068] In particular, in order to increase the change in the light intensity of the lens 10 when the human body moves in the forward field of view 110, in the side-mounted use state of the infrared detection device, the plane defined by the mounting position of the pyroelectric infrared sensor 20 and the optical centers of any two first lens units 111 is used as the horizontal plane, and the optical center design of each second lens unit 121 preferably satisfies: the inclination angle of the line between the optical center of each second lens unit 121 and the mounting position of the pyroelectric infrared sensor 20 relative to the horizontal plane is greater than or equal to 10°. In this way, the change in the blind spot height between the forward field of view 110 and the forward and downward field of view 120 in the direction of the forward field of view 110 (the radial direction of the infrared detection device) is increased when the infrared detection device is installed in the side state. Corresponding to an installation height of 2 meters or less, the blind spot space occupied by the human body moving in the direction of the forward field of view 110 and radially relative to the infrared detection device has a larger change, which is beneficial to improving the signal strength generated by the corresponding pyroelectric infrared sensor 20 based on the change in the light intensity of the lens 10, thereby forming an equivalent improvement in the radial sensitivity of the infrared detection device.

[0069] It is understandable that, whether for a top-mounted or side-mounted infrared detection device, it is well known to those skilled in the art that the resolution of the infrared detection device is directly related to the distribution density of the field of view corresponding to each lens unit in a unit space, wherein the higher the distribution density of the field of view corresponding to each lens unit in a unit space, the more it means that even a smaller movement amplitude can form a cross-boundary displacement of the corresponding infrared light spot on the temperature-sensing surface and can detect micro-movements of the human body based on the corresponding electrical signal changes. In other words, the higher the distribution density of the field of view corresponding to each lens unit in a unit space, the higher the resolution of the corresponding infrared detection device. Therefore, under the lens design concept of the existing infrared detection device, the angle between the fields of view corresponding to adjacent lens units is usually smaller, so as to reduce the blind spot between adjacent fields of view and increase the distribution density of the field of view corresponding to each lens unit in a unit space.

[0070] That is to say, in the side-mounted use state of the infrared detection device, the plane defined by the mounting position of the pyroelectric infrared sensor 20 and the optical centers of any two first lens units 111 is taken as the horizontal plane. When the optical center design of each second lens unit 121 satisfies that the inclination angle of the line connecting the mounting position of the pyroelectric infrared sensor 20 with respect to the horizontal plane is greater than or equal to 10°, the setting of this angle range is contrary to the lens design concept of the existing infrared detection device. However, based on the setting of this angle range, the blind spot space occupied by the human body moving in the direction of the forward field of view 110 and radially relative to the infrared detection device has a large change, which is conducive to improving the signal strength generated by the corresponding pyroelectric infrared sensor 20 based on the change in the light intensity received by the lens 10, thereby forming an equivalent improvement in the radial sensitivity of the infrared detection device.

[0071] In particular, in this embodiment of the present invention, the optical center design of each first lens unit 111 and each second lens unit 121 further satisfies: there is only one optical center of the second lens unit 121 between two planes passing through the optical centers of any two adjacent first lens units 111 and perpendicular to the line connecting the optical centers of the two first lens units 111. In this way, when the infrared detection device is installed on the side for use, Figure 2D As shown, the bright and dark fields in the forward field of view 110 corresponding to each of the first lens units 111 are respectively located in the upper space of the blind spot between the bright and dark fields of the corresponding forward downward field of view 120 and the upper space of the blind spot between the forward downward field of view 120 and the adjacent forward downward field of view 120, or as shown Figure 2EAs shown, the forward field of view 110 corresponding to each of the first lens units 111 is located in the upper space of the blind spot between the corresponding two forward downward fields of view 120, corresponding to an installation height of 2 meters or less. Based on the complementarity of the forward field of view 110 and the forward downward field of view 120 in the tangential direction, the tangential resolution of the infrared detection device is improved.

[0072] It is worth mentioning that Figure 2D and Figure 2E The complementary effect of the front field of view 110 and the front downward field of view 120 in the tangential direction is in the corresponding Figure 2A The diagram shows two complementary effects formed based on the optical center distribution design that meets the above requirements under the limitation of the number of the first lens unit 111 and the second lens unit 121. Figure 2A Based on the structure of the lens 10 shown in FIG. 1 , the number of the first lens units 111 is increased, corresponding to Figure 2D In the complementary effect shown, the upper space of the blind spot between the bright and dark fields of the front downward field of view 120 and the upper space of the blind spot between the front downward field of view 120 and the adjacent front downward field of view 120 can further complement the bright and dark fields in the increased forward field of view 110. Figure 2D This presents a completely completed effect, to which the present invention is not limited.

[0073] It is understood that human movement is typically accompanied by micro-motions in various directions. Consequently, a person moving in the direction of the forward field of view 110 and radially relative to the infrared detection device typically generates accompanying tangential micro-motions. Therefore, when the tangential resolution of the infrared detection device is improved based on the tangential complementarity between the forward field of view 110 and the front-downward field of view 120, at an installation height of 2 meters or less, the accompanying tangential micro-motions generated by a person moving in the direction of the forward field of view 110 and radially relative to the infrared detection device can be effectively detected, thereby achieving an equivalent improvement in the radial resolution and sensitivity of the infrared detection device.

[0074] That is to say, in the side-mounted use state of the infrared detection device, with the plane defined by the mounting position of the pyroelectric infrared sensor 20 and the optical centers of any two first lens units 111 as the horizontal plane, when the optical center of each second lens unit 121 is designed to satisfy the inclination angle of the line connecting the mounting position of the pyroelectric infrared sensor 20 with the horizontal plane being greater than or equal to 10°, the setting of this angle range is contrary to the lens design concept of the existing infrared detection device, and correspondingly reduces the resolution of the infrared detection device in the radial direction. However, based on the setting of this angle range, the blind spot space occupied by the human body moving in the direction of the forward field of view 110 and radially relative to the infrared detection device has a large change, which is conducive to improving the signal strength generated by the corresponding pyroelectric infrared sensor 20 based on the change in the light intensity received by the lens 10, thereby forming an equivalent improvement in the radial sensitivity of the infrared detection device.

[0075] In addition, when the tangential resolution of the infrared detection device is improved based on the complementarity of the forward field of view 110 and the front-downward field of view 120 in the tangential direction, since the movement of the human body is usually accompanied by micro-movements in various directions, the human body that moves in the direction of the forward field of view 110 and moves radially relative to the infrared detection device usually produces accompanying tangential micro-movements based on the movement. Therefore, at an installation height of 2 meters or below, when the human body moves in the direction of the forward field of view 110 and moves radially relative to the infrared detection device, the accompanying tangential micro-movements generated by the human body based on the movement can be effectively detected, thereby forming an equivalent improvement in the radial resolution and sensitivity of the infrared detection device.

[0076] Furthermore, in this embodiment of the present invention, in a state where the first focusing area 11 and the second focusing area 12 are arranged up and down to face the light input surface 101 or the light output surface 102 of the lens 10, the second lens unit 121 of the second focusing area 12 has an optical center distribution with a high middle and low sides, so as to be suitable for the side-mounted use state of the infrared detection device, so that the projection distribution of the front downward field of view 120 corresponding to each second lens unit 121 on the ground corresponds to the projection of the light and dark areas staggered along the fan ring, which is beneficial to enhance the tangential movement component of the human body moving in the direction of the side mounting surface of the lens 10 and perpendicular to the side mounting surface of the lens 10 in the front downward field of view 120, thereby enhancing the radial sensitivity of the infrared detection device in the side-mounted use state.

[0077] It is worth mentioning that each of the lens units 111 and 121 with focusing characteristics can be designed as a convex lens to have focusing characteristics, or can be set as a Fresnel lens based on the design of corresponding Fresnel patterns to have focusing characteristics, or can be designed as a convex lens based on the design of corresponding Fresnel patterns to have focusing characteristics, and the present invention does not limit this.

[0078] Furthermore, each of the lens units 111 and 121 has a light-gathering property and is optically equivalent to a convex lens. However, the convex lens to which each of the lens units 111 and 121 is optically equivalent is not limited to a convex lens having its geometric center as its optical center; it may be equivalent to a fragment of a convex lens having its geometric center as its optical center. Therefore, in the lens 10 of the present invention, the optical centers of the lens units 111 and 121 may not be located on the lens units 111 and 121 themselves, and this is not a limitation of the present invention.

[0079] Further reference is made to the accompanying drawings of the present invention. Figures 3A to 3E As shown, the structure of a lens suitable for side-mounted detection at low installation heights according to another embodiment of the present invention and the principle of the lens in side-mounted use at an installation height of 2 meters or less are illustrated.

[0080] Specifically, in this embodiment of the present invention, the lens 10 further includes a third focusing area 13 arranged below the second focusing area 12 in a side-mounted state on the basis of the structure of the lens 10 in the aforementioned embodiment, wherein the third focusing area 13 includes a plurality of third lens units 131 arranged left and right, each of the third lens units 131 having a focusing characteristic and a focal length designed to match the installation position of the aforementioned pyroelectric infrared sensor 20. In this way, in the side-mounted state of the infrared detection device, a near-field of view 130 corresponding to the third focusing area 13 is formed in the downward space of the front downward field of view 120 corresponding to the second focusing area 12, corresponding to an installation height of 2 meters or less, thereby further enabling the infrared detection device to detect children moving in the downward space of the front downward field of view 120 corresponding to the second focusing area 12 and a human body in a squatting state.

[0081] In particular, in this embodiment of the present invention, the first focusing area 11 and the second focusing area 12 are arranged up and down to face the light incident surface 101 of the lens 10, and the optical centers of the third lens units 131 arranged left and right are designed to be staggered in height. In this way, under the appropriate area limit of the third focusing area 13, the angular span between the near-field of view 130 corresponding to each of the third lens units 131 in the direction of the forward field of view 110 is improved, and at the same time, the near-field of view 130 corresponding to each of the third lens units 131 is complemented in the tangential direction, so that the infrared detection device can obtain good radial sensitivity and tangential sensitivity in the downward space of the front downward field of view 120 corresponding to the second focusing area 12 based on the side installation method at an installation height of 2 meters or less.

[0082] It is worth mentioning that in this embodiment of the present invention, the number of the third lens units 131 is an odd number, wherein the first focusing area 11 and the second focusing area 12 are arranged up and down, facing the light incident surface 101 of the lens 10. From left to right, the optical center height of the odd-numbered third lens unit 131 is higher than the optical center height of the adjacent third lens unit 131. In this way, the optical centers of the third lens units 131 arranged on the left and right are designed to be staggered in height, which is beneficial to the uniform distribution of the near-zone field of view 130 corresponding to the third focusing area 13 in the downward space of the front downward field of view 120 corresponding to the second focusing area 12, and correspondingly beneficial to ensuring the stability of the infrared detection device in detecting children and people in a squatting state who are active in the downward space of the front downward field of view 120 corresponding to the second focusing area 12.

[0083] In particular, the second lens unit 121 in the second focusing area 12 has an optical center distribution that is high in the middle and low on both sides. In order to further optimize the uniform distribution of the near-field of view 130 corresponding to the third focusing area 13 in the downward space of the front downward field of view 120 corresponding to the second focusing area 12, in a state where the first focusing area 11 and the second focusing area 12 are arranged up and down, facing the light incident surface 101 of the lens 10, the odd-numbered third lens units 131 are preferably arranged to have an optical center distribution that is high in the middle and low on both sides in order from left to right.

[0084] It can be understood that in the schematic drawings of the lens 10 in the above-mentioned embodiments of the present invention, in order to better understand the arrangement between different lens units, different lens units are indicated by dashed lines. The actual lens 10 is designed based on the specific material and the shape of each lens unit. From the perspective of the light incident surface 101 directly facing the lens 10, the boundary lines between different lens units can be designed to be visible or non-visual. For example, when the lens 10 is designed to be transparent, different lens units may present a visible dividing line based on the sudden change in texture or thickness; for example, when the light-entering surface 101 of the lens 10 is designed to be an overall spherical structure formed by splicing the planar light-entering surfaces of each lens unit, different lens units may also present a visible dividing line; and when the light-entering surface 101 of the lens 10 is designed to be a spherical or planar structure, and the lens 10 is set to a white state, for example, by adding relevant color powder / colorant to the main material of the lens, the dividing line between the lens units is not visible from the perspective of directly facing the light-entering surface 101 of the lens 10.

[0085] In addition, it can be understood that, from the perspective of the light-incoming surface 101 directly facing the lens 10, regardless of whether the dividing line between different lens units is designed to be visualized, the lens 10 can be set to white, which is conducive to improving the aesthetics and concealment of the infrared detection device based on the same color design of the lens 10 and the infrared detection device.

[0086] It is worth mentioning that in the above-mentioned embodiments of the present invention, in the state where the first focusing area 11 and the second focusing area 12 are arranged up and down, the pyroelectric infrared sensor 20 of the infrared detection device is arranged at a position upwardly deviated from the center of the lens 10 with its temperature-sensitive surface facing the light-emitting surface 102 of the lens 10, so that when the infrared detection device is installed on the side, the initial direction of the forward field of view 110 corresponding to the first focusing area 11 can be close to or directly pointed forward, thereby avoiding large-angle flipping adjustment of the infrared detection device in the side-installed state of the infrared detection device, which is conducive to simplifying the installation requirements of the infrared detection device and improving the aesthetics of the infrared detection device in the side-installed state.

[0087] In addition, when the first focusing area 11 and the second focusing area 12 are arranged up and down, the pyroelectric infrared sensor 20 of the infrared detection device is set at a position deviated from the center of the lens 10 with its temperature-sensitive surface tilted downward toward the light-emitting surface 102 of the lens 10. In this way, when the pyroelectric infrared sensor 20 of the infrared detection device is deviated from the center of the lens 10, the light loss of the temperature-sensitive surface of the pyroelectric infrared sensor 20 to the second focusing area 12 is reduced, which is correspondingly beneficial to ensuring the radial sensitivity of the infrared detection device.

[0088] Furthermore, in some embodiments of the present invention, in a state where the first focusing area 11 and the second focusing area 12 are arranged up and down, when the pyroelectric infrared sensor 20 of the infrared detection device is set at a position upwardly deviated from the center of the lens 10 with its temperature-sensitive surface facing the light-emitting surface 102 of the lens 10, the pyroelectric infrared sensor 20 is preferably set in a lateral space corresponding to the second focusing area 12, that is, the height of the pyroelectric infrared sensor 20 is preferably set to be lower than the height of the lower boundary of the first focusing area 11. In this way, the light loss of the temperature-sensitive surface of the pyroelectric infrared sensor 20 to the second focusing area 12 is further reduced when the pyroelectric infrared sensor 20 of the infrared detection device is upwardly deviated from the center of the lens 10. Correspondingly, the optical center of each first lens unit 111 of the first focusing area 11 is preferably set to be lower than the lower boundary of the first lens unit 111 to which it belongs and lower than the lower boundary of the first focusing area 11, such as being set in the second focusing area 12, so that it can be installed on the side of the infrared detection device, so that the initial direction of the forward field of view 110 corresponding to the first focusing area 11 can approach or directly point forward.

[0089] For a further understanding of the present invention, refer to the accompanying drawings of the present invention. Figures 4 to 6 As shown, the infrared detection device according to different embodiments of the present invention is schematically shown. Figure 6 The infrared detection device further comprises a housing 30 and a base 40, wherein the bottom surface of the base 40 is a side mounting surface of the infrared detection device, and the housing 30 is movably and adjustably arranged at one end of the base 40 opposite to its bottom surface. For example, the housing 30 is movably and adjustably arranged on the base 40 in a magnetically adsorbed manner, wherein the housing 30 corresponds to Figure 4 and Figure 5A housing cavity and an opening communicating with the housing cavity are defined, wherein the pyroelectric infrared sensor 20 is disposed in the housing cavity with its temperature-sensing surface facing the opening, and the lens 10 is disposed in the opening with its light-emitting surface 102 facing the opening of the housing cavity. In this way, when the infrared detection device is mounted on the side of the side mounting surface based on the fixation of the bottom surface of the base 40 to the corresponding side mounting surface, the orientation of the infrared detection device can be adjusted based on the movable adjustment of the shell 30 on the base 40, and the infrared detection device can be maintained by removing the shell 30 from the base 40. For example, when the infrared detection device is configured to be battery-powered, the shell 30 can be removed from the base 40 to replace or charge the battery.

[0090] In particular, when the pyroelectric infrared sensor 20 of the infrared detection device corresponds to Figure 4 and Figure 5 When the infrared detection device is arranged at a position upwardly deviated from the center of the lens 10 with its temperature sensing surface facing the light exit surface 102 of the lens 10, the infrared detection device may optionally correspond to Figure 5 A microwave detection module 50 for microwave detection is provided below the pyroelectric infrared sensor 20 to improve the sensitivity of the infrared detection device, especially the detection sensitivity in the radial direction, based on the dual detection of infrared and microwaves.

[0091] It is worth mentioning that the microwave detection module 50 is susceptible to interference from the housing 30 and is usually required to be installed in the center under the appropriate housing size limit. Figure 5 In the infrared detection device, benefiting from the fact that the pyroelectric infrared sensor 20 is arranged at a position upwardly deviated from the center of the lens 10 with its temperature-sensitive surface facing the light-emitting surface 102 of the lens 10, the housing 30 of the infrared detection device will adapt to the installation of the microwave detection module 50.

[0092] Furthermore, in the corresponding Figure 5In the infrared detection device, the microwave detection module 50 is configured to use a multi-element patch antenna as the microwave transmitting and / or receiving antenna of the microwave detection module 50. Specifically, in this embodiment of the present invention, the multi-element patch antenna includes two planar radiation sources 51, wherein corresponding to the viewing angles of the first focusing area 11 and the second focusing area 12 arranged up and down, the two planar radiation sources 51 of the multi-element patch antenna are arranged up and down and have the same polarization direction in the left and right directions. In this way, the radiation pattern of the multi-element patch antenna is compressed in the up and down directions. The radial sensitivity of the infrared detection device is improved in the direction of the forward field of view 110. At the same time, based on the shape of the radiation pattern compressed in the up and down directions, the forward height limit of the upper and lower areas of the microwave detection module 50 based on stability requirements is reduced, and the mutual influence between the components arranged in the upper and lower areas of the microwave detection module 50 and the microwave detection module 50 is correspondingly reduced, such as the mutual influence between the infrared pyroelectric infrared sensor 20 or the communication module for networking and the microwave detection module 50.

[0093] Those skilled in the art will appreciate that the above embodiments are merely examples, and features of different embodiments may be combined with each other to obtain implementation methods that are easily conceivable based on the disclosure of the present invention but are not explicitly indicated in the drawings.

[0094] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A lens suitable for low-mounted detection at the bottom, wherein the lens is suitable for use as a lens for an infrared detection device and has a light-incoming surface and a light-outgoing surface opposite to the light-incoming surface, characterized in that: The infrared detection device is installed on the side thereof so as to face the light-incoming surface of the lens in a use state, and the lens comprises: a first light focusing area, the first light focusing area including a plurality of first lens units arranged left and right; and A second focusing area, which is arranged below the first focusing area, wherein the second focusing area accounts for more than 50% of the area of ​​the lens and includes a plurality of second lens units arranged left and right, each of the first lens unit and each of the second lens units has a focusing characteristic and is designed with a focal length that can match the same pyroelectric infrared sensor mounting position, wherein the first focusing area is used to form a forward field of view when the infrared detection device is installed on the side of the device, and the corresponding second focusing area is used to form a front downward field of view when the infrared detection device is installed on the side of the device.

2. The lens suitable for low-mounting side-mounted detection according to claim 1, wherein, in the side-mounted state of the infrared detection device, with the plane defined by the pyroelectric infrared sensor mounting position and the optical centers of any two of the first lens units as a horizontal plane, the optical center of each of the second lens units is designed to satisfy the following requirement: the inclination angle of the line connecting the optical center of each second lens unit and the pyroelectric infrared sensor mounting position with respect to the horizontal plane is greater than or equal to 10°.

3. The lens suitable for low-mounting-height bottom-mounted detection according to claim 1 or 2, wherein the optical centers of each first lens unit and each second lens unit are designed to satisfy the following conditions: there is only one optical center of the second lens unit between two planes passing through the optical centers of any two adjacent first lens units and perpendicular to the line connecting the optical centers of the two first lens units.

4. The lens suitable for low-mounting-height bottom-mounted detection according to claim 3, wherein the first focusing area and the second focusing area are arranged up and down to face the light-incoming surface of the lens, and the second lens unit of the second focusing area has an optical center distribution that is high in the middle and low on both sides.

5. The lens suitable for low-mounting-height lower-side mounting detection according to claim 3, wherein the lens further includes a third focusing area arranged below the second focusing area, wherein the third focusing area includes a plurality of third lens units arranged left and right, each of the third lens units has a focusing characteristic and is designed with a focal length that can match the mounting position of the pyroelectric infrared sensor, so that when the infrared detection device is installed on the side and used, a near-field of view corresponding to the third focusing area is formed in the downward space of the front downward field of view corresponding to the second focusing area.

6. The lens suitable for low-mounting-height bottom-mounted detection according to claim 5, wherein the first focusing area and the second focusing area are arranged vertically to face the light-incoming surface of the lens, and the optical centers of the third lens units arranged left and right are designed to be staggered in height.

7. The lens suitable for low-mounting-height bottom-mounted detection according to claim 6, wherein the number of the third lens units is an odd number, wherein when the first focusing area and the second focusing area are arranged vertically and face the light-incoming surface of the lens, in order from left to right, the optical center height of the odd-numbered third lens unit is higher than the optical center height of the adjacent third lens unit.

8. The lens suitable for low-mounting-height bottom-mounted detection according to claim 7, wherein when the first focusing area and the second focusing area are arranged up and down to face the light-entering surface of the lens, in order from left to right, the odd-numbered third lens units are arranged to have an optical center distribution with a high center and low sides.

9. The lens suitable for low-mounting-height bottom-mounted detection according to claim 5, wherein when the first focusing area and the second focusing area are arranged one above the other, the optical center of each first lens unit is set lower than the lower boundary of the first lens unit to which it belongs.

10. Infrared detection device, characterized in that, include: a base, wherein the infrared detection device has the bottom surface of the base as a side mounting surface; a housing, wherein the housing is movably and adjustably disposed at an end of the base opposite to the bottom surface thereof, and the housing defines a receiving cavity and an opening communicating with the receiving cavity; a pyroelectric infrared sensor, the pyroelectric infrared sensor being disposed in the accommodating cavity with its temperature-sensing surface facing the opening; and A lens, wherein the lens has a light-entry surface and a light-exiting surface opposite to the light-entry surface, and is arranged at the opening with its light-exiting surface facing the opening of the accommodating cavity, wherein the light-entry surface of the lens is directly facing the light-entry surface when the infrared detection device is installed on the side. The lens includes a first light-focusing area and a second light-focusing area arranged vertically, wherein the first light-focusing area includes a plurality of first lens units arranged on the left and right, and the second light-focusing area accounts for more than 50% of the area of ​​the lens and includes a plurality of second lens units arranged on the left and right, each of the first lens units and each of the second lens units has a light-focusing characteristic and is designed to match the pyroelectric infrared sensor in terms of focal length, wherein the first light-focusing area is used to form a forward field of view when the infrared detection device is installed on the side, and the corresponding second light-focusing area is used to form a front downward field of view when the infrared detection device is installed on the side.

11. The infrared detection device according to claim 10, wherein the optical centers of each of the first lens units and each of the second lens units are designed to satisfy the following conditions: there is only one optical center of the second lens unit between two planes passing through the optical centers of any two adjacent first lens units and perpendicular to the line connecting the optical centers of the two first lens units.

12. The infrared detection device according to claim 11, wherein the lens further includes a third focusing area arranged below the second focusing area, wherein the third focusing area includes a plurality of third lens units arranged left and right, each of the third lens units has a focusing characteristic and is designed with a focal length that can match the mounting position of the pyroelectric infrared sensor, so that when the infrared detection device is installed on the side and used, a near-field of view corresponding to the third focusing area is formed in the downward space of the front downward field of view corresponding to the second focusing area.

13. The infrared detection device according to claim 12, wherein the first focusing area and the second focusing area are arranged vertically to face the light incident surface of the lens, and the optical centers of the third lens units arranged left and right are designed to be staggered in height. The infrared detection device according to claim 11 , wherein the lens and the housing are set to be the same color as white.

15. The infrared detection device according to any one of claims 10 to 14, wherein in a side-mounted state of the infrared detection device, with the plane defined by the pyroelectric infrared sensor and the optical centers of any two of the first lens units as a horizontal plane, the optical center of each of the second lens units is designed to satisfy the following requirement: the inclination angle of the line between the optical center of each of the second lens units and the pyroelectric infrared sensor relative to the horizontal plane is greater than or equal to 10°.

16. The infrared detection device according to any one of claims 10 to 14, wherein when the first focusing area and the second focusing area are arranged vertically, the pyroelectric infrared sensor is arranged at a position upwardly deviated from the center of the lens with its temperature-sensitive surface facing the light-emitting surface of the lens.

17. The infrared detection device according to claim 16, wherein the pyroelectric infrared sensor is arranged at a position upwardly deviated from the center of the lens with its temperature sensing surface tilted downward toward the light exit surface of the lens. 18 . The infrared detection device according to claim 17 , wherein when the first light-focusing area and the second light-focusing area are arranged vertically, the optical center of each first lens unit is set lower than the lower boundary of the first lens unit to which it belongs.

19. The infrared detection device according to claim 16, wherein the infrared detection device further comprises a microwave detection module for microwave detection and disposed below the pyroelectric infrared sensor.

20. An infrared detection device according to claim 19, wherein the microwave detection module is configured to use a multi-element patch antenna as a microwave transmitting and / or receiving antenna, wherein the multi-element patch antenna includes two planar radiation sources, wherein corresponding to the viewing angles of the first focusing area and the second focusing area arranged up and down, the two planar radiation sources of the multi-element patch antenna are arranged up and down and are configured to have the same polarization direction in the left and right directions.

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