Staggered sectional type infrared detection lens and infrared detection device

Abstract

The invention provides a staggered sectional type infrared detection lens and an infrared detection device, and the staggered sectional type infrared detection lens is provided with a central lens group and a wide-angle lens group which is staggered relative to the central lens group. And on the basis of the staggered arrangement between the central lens group and the wide-angle lens group and the staggered segmented light inlet surface design, the overall convex light inlet surface form has the size relatively compressed in the convex direction, so that the detection precision state of the infrared detection device is ensured through the large light inlet surface area design; and the miniaturization design of the infrared detection device is considered.

Description

Technical Field

[0001] The present invention relates to the field of infrared detection, and more particularly to a staggered segmented infrared detection lens and an infrared detection device. Background Art

[0002] With the development of Internet of Things technology and the popularization of low-carbon and environmental protection concepts, artificial intelligence, smart home, and smart security technology have an increasing demand for environmental detection, especially for human movement detection. Based on the detection results of whether human body exists, the corresponding electrical equipment is controlled to realize intelligent control of the working status of electrical equipment. For example, the lighting status of lamps is controlled based on the detection results of whether human body exists, thereby realizing intelligent low-carbon lighting.

[0003] 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 1The structural principle includes a Fresnel lens 10P and a pyroelectric infrared sensor 20P, wherein the pyroelectric infrared sensor 20P in a binary form is taken as an example, the pyroelectric 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 is provided with a lens array composed of a plurality of lens units 11P based on a corresponding texture design on a side opposite to the light-incoming surface 11P, wherein each of the lens units 11P has a focusing characteristic like a convex lens, and the pyroelectric 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 sensing area 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-sensitive areas through the lens unit 11P, corresponding to the positive temperature-sensitive surface The temperature-sensing area formed by the lens unit 11P of the positive temperature-sensing surface 21P through the lens unit 11P is a bright area, and the temperature-sensing area 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 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 sensor 20P to generate a negative voltage. In this way, the pyroelectric sensor 20P can form a corresponding number of sensing areas through the lens array of the Fresnel lens 10P, thereby forming a corresponding number of bright areas and dark areas, as well as a blind area defined between the bright areas and the dark areas. When the human body crosses between any two areas among the bright area, the dark area and the blind area, a corresponding displacement of the infrared light spot is formed, and the cross-area movement of the human body can be detected based on the corresponding electrical signal changes.

[0004] According to the above-mentioned working principle of the infrared detection device, the effective light incident angle of the Fresnel lens 10P corresponds to the angle θ in the figure. When the effective light incident angle of the Fresnel lens 10P is fixedly designed, the number of the lens units 11P is associated with the number of the sensing areas within the unit angle range and is associated with the resolution of the infrared detection device. When the number of the lens units 11P is fixedly designed, the area of the light incident surface 101P of the Fresnel lens 10P is associated with the light incident intensity of each lens unit 11P and is associated with the detection accuracy of the infrared detection device. That is to say, in the actual design of the Fresnel lens 10P, when the area of the light incident surface 101P and the effective light incident angle of the Fresnel lens 10P are fixedly designed, the resolution of the infrared detection device is negatively correlated with the detection accuracy. The greater the number of the corresponding lens units 11P, the denser the distribution of the sensing area within the unit angle range, the greater the displacement change of the infrared light spot corresponding to the tiny movements of the human body, and the higher the resolution of the infrared detection device; however, the smaller the area of the light incident surface 101P corresponding to each lens unit 11P, so that the lower the light incident intensity of each lens unit 11P, the lower the intensity of the aforementioned infrared light spot, and the lower the detection accuracy of the infrared detection device. Therefore, in order to take into account both the resolution and detection accuracy of the infrared detection device, the light-entry surface 101P of the Fresnel lens 10P is usually designed to have a larger area. Especially when the infrared detection device has a large detection angle requirement, the light-entry surface 101P of the Fresnel lens 10P is usually set to be convex as a whole in a state with a larger area. In this way, while matching the effective light-entry angle of the pyroelectric sensor 20P, it is beneficial to reduce the diameter and light-entry loss of the Fresnel lens 10P based on the convex design of the light-entry surface 101P, which is beneficial to the miniaturization of the infrared detection device and the reduction of the light-entry loss of the Fresnel lens 10P, thereby improving the detection accuracy of the infrared detection device.

[0005] To sum up, when the existing infrared detection device has a large detection angle requirement, the corresponding light-entry surface 101P of the Fresnel lens 10P is generally designed with a larger area and convex. Correspondingly, during the use of the infrared detection device, on the one hand, the convex design of the light-entry surface 101P with a larger area will affect the appearance of the infrared detection device; on the other hand, the convex design of the light-entry surface 101P with a larger area makes the Fresnel lens 10P more susceptible to dust adhesion and aging due to sunlight exposure in outdoor use environments, which correspondingly increases the light-entry loss of the Fresnel lens 10P and reduces the accuracy of the infrared detection device; in addition, the convex design of the light-entry surface 101P with a larger area also makes the Fresnel lens 10P more susceptible to interference from wind and rain and convection of cold and hot winds, thereby affecting the working stability of the infrared detection device. Summary of the Invention

[0006] One object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens, based on the staggered segmented light-entry surface design, can take into account both the large light-entry surface area requirements and the small volume requirements under a fixed effective light-entry angle design, thereby being conducive to ensuring the detection accuracy of the infrared detection device with a large light-entry surface area design while taking into account the miniaturization design of the infrared detection device.

[0007] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens is based on a staggered segmented light-entry surface design. While ensuring the detection accuracy of the infrared detection device with a large light-entry surface area design, the light-entry surface has a relatively compressed size in the convex direction compared to the overall convex shape, thereby facilitating the reduction of the volume of the staggered segmented infrared detection lens while taking into account the miniaturization design of the infrared detection device.

[0008] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens is based on a staggered segmented light-entry surface design, and compared with the overall convex light-entry surface shape, it has a relatively compressed size in the convex direction, which is beneficial for reducing the probability of being disturbed by wind and rain and cold and hot wind convection when being assembled in the infrared detection device, thereby ensuring the working stability of the infrared detection device.

[0009] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens is based on a staggered segmented light-entry surface design, and compared with the overall convex light-entry surface shape, has a relatively compressed size in the convex direction, thereby being beneficial in reducing the amount of dust falling and the sunlight area when being assembled in the infrared detection device, thereby ensuring the working stability of the infrared detection device and extending the service life of the infrared detection device.

[0010] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens is based on a staggered segmented light-entry surface design, and has a relatively compressed size in the convex direction compared to the overall convex light-entry surface shape. Therefore, relative to the overall convex light-entry surface shape, based on the recessed installation requirements of the staggered segmented infrared detection lens in the infrared detection device, the infrared detection device has a smaller shell diameter requirement, which is conducive to the miniaturization design of the infrared detection device.

[0011] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein based on the requirement of the recessed installation of the staggered segmented infrared detection lens in the infrared detection device, the staggered segmented infrared detection lens has a smaller shell diameter requirement for the infrared detection device, and thus the relatively overall convex light-entry surface shape is conducive to the recessed installation of the staggered segmented infrared detection lens in the infrared detection device, which is conducive to obtaining a relatively beautiful visual experience while taking into account the miniaturization design of the infrared detection device.

[0012] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens is based on a staggered segmented light-entry surface design, and the overall convex light-entry surface shape is more conducive to the recessed installation of the staggered segmented infrared detection lens in the infrared detection device, thereby facilitating the recessed installation of the staggered segmented infrared detection lens in the infrared detection device, further reducing the probability of interference from wind and rain and cold and hot wind convection, and reducing the amount of dust falling and the area of sunlight, thereby ensuring the working stability of the infrared detection device and extending the service life of the infrared detection device.

[0013] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens has a central lens group, a wide-angle lens group arranged staggered relative to the central lens group, and an intersection connected between the central lens group and the wide-angle lens group, wherein the central lens group and the wide-angle lens group are both lens groups formed by an array arrangement of multiple lens units, wherein the axis passing through the physical center point of the light-incoming surface of the central lens group and perpendicular to the light-incoming surface of the central lens group is the central axis of the central lens group, the smallest focal length of the focal lengths of the lens units of the central lens group is f, and the direction of the light-incoming surface of the central lens group along the central axis is the bottom direction, the central lens group and the wide-angle lens group satisfy on the same cross-section along the central axis: the lower end of the wide-angle lens group on the same side of the central axis is lower than the outer edge of the central lens group, and are relative to each other. The outer edge of the central lens group is away from the central axis, the upper end of the wide-angle lens group on the same side of the central axis is not lower than the outer edge of the central lens group, and is away from the central axis relative to the lower end of the wide-angle lens group, wherein the line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group intersects with the central axis at a point P, and the height of point P relative to the central lens group along the central axis is less than f, so that the staggered segmented infrared detection lens has a staggered segmented light-entry surface design, and when the light-entry surface of the staggered segmented infrared detection lens is staggered and segmented, it avoids the intersection between the central lens group and the wide-angle lens group blocking the effective light-entry angle of any of the lens groups, thereby comparing with the overall convex light-entry surface shape, it can take into account both the large light-entry surface area requirements and the small volume requirements under the fixed effective light-entry angle design based on the staggered segmented light-entry surface design.

[0014] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the light-entering surface of the central lens group is set as a plane, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end via the intersection when it is arranged around the central lens group, so as to form a structural form in which the wide-angle lens group is staggered relative to the central lens group, and while obtaining a relatively beautiful visual experience based on the plane design of the light-entering surface of the central lens group, based on the staggered design of the wide-angle lens group relative to the central lens group, it takes into account both the requirements of large light-entering surface area and small volume.

[0015] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the central lens group is arranged on a cross section along the central axis to further satisfy: the central lens group has a structural form that is low in the middle and high at both ends, and the corresponding central lens group is designed to be sunken and has an outer edge that is higher than the main body, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end through the intersection when it is arranged around the central lens group, so as to form a structural form in which the wide-angle lens group is staggered relative to the central lens group, and based on the sunken design of the central lens group and the staggered design of the wide-angle lens group relative to the central lens group, while taking into account the requirements of large light-entry surface area and small volume, the structural strength of the staggered segmented infrared detection lens is guaranteed and it is conducive to obtaining a relatively beautiful visual experience.

[0016] Another object of the present invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the central lens group and the wide-angle lens group further satisfy on the same cross-section along the central axis: the lower end of the wide-angle lens group on the same side of the central axis is flush with the lowest point of the light-entering surface of the central lens group within a height error range of 3 mm, so as to ensure the detection accuracy of the infrared detection device in the wide-angle direction while ensuring the light-entering surface area of the wide-angle lens group. Compared with the overall convex light-entering surface shape, the size of the staggered segmented infrared detection lens is further compressed in the convex direction, which is conducive to reducing the volume of the staggered segmented infrared detection lens and obtaining a relatively beautiful visual experience.

[0017] According to one aspect of the present invention, the present invention provides a staggered segmented infrared detection lens, the staggered segmented infrared detection lens comprising:

[0018] a central lens group, wherein the central lens group is a lens group formed by an array arrangement of a plurality of lens units;

[0019] a wide-angle lens group, wherein the wide-angle lens group is a lens group formed by an array of multiple lens units and is staggered relative to the central lens group; and

[0020] A junction portion, wherein the junction portion is connected between the central lens group and the wide-angle lens group, wherein the axis passing through the physical center point of the light-entering surface of the central lens group and perpendicular to the light-entering surface of the central lens group is the central axis of the central lens group, and the direction of the light-entering surface of the central lens group along the central axis is the bottom direction, and the central lens group and the wide-angle lens group meet the following conditions on the same cross section along the central axis: the light-entering surface of the wide-angle lens group faces away from the central axis, the lower end of the wide-angle lens group on the same side of the central axis is lower than the outer edge of the central lens group and is away from the central axis relative to the outer edge of the central lens group, and the upper end of the wide-angle lens group on the same side of the central axis is away from the central axis relative to the lower end of the wide-angle lens group, wherein for a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group, the focus of the lens unit of the wide-angle lens group on this side in this cross section is located above the line.

[0021] In one embodiment, wherein the smallest focal length among the lens units of the central lens group is f, the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis: a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group intersects the central axis at a point P, and the height of point P relative to the central lens group along the central axis is less than f.

[0022] In one embodiment, the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis, that the upper end of the wide-angle lens group on the same side of the central axis is not lower than the outer edge of the central lens group.

[0023] In one embodiment, the light incident surface of the central lens group is set to be a plane, and the wide-angle lens group is arranged around the central lens group and is connected to the outer edge of the central lens group via the junction at its lower end.

[0024] In one embodiment, the central lens group is arranged on a cross section along the central axis to further satisfy: the central lens group has a structural form with a low middle and high ends, and the corresponding central lens group is designed to be sunken and has an outer edge higher than the main body, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end through the intersection when it is arranged around the central lens group.

[0025] In one embodiment, the central lens group is designed to have a light-incoming surface consisting of a bottom light-incoming surface and a plurality of side light-incoming surfaces arranged around the bottom light-incoming surface and inclined to the bottom light-incoming surface.

[0026] In one embodiment, the bottom light-incoming surface and the side light-incoming surface of the central lens group are both planes.

[0027] In one embodiment, the bottom light-incoming surface of the central lens group is a plane, and each of the side light-incoming surfaces is integrally designed as an annular inclined surface inclined to the bottom light-incoming surface.

[0028] In one embodiment, the light incident surface of the central lens group is designed as a spherical section as a whole.

[0029] In one embodiment, the light-incoming surface of the wide-angle lens assembly is designed to be formed by laterally splicing together a plurality of trapezoidal light-incoming surfaces.

[0030] In one embodiment, the light incident surface of the wide-angle lens assembly is designed as a circular inclined surface as a whole.

[0031] In one embodiment, the height difference between the optical centers of any two lens units of the staggered segmented infrared detection lens along the central axis is less than or equal to 5 mm.

[0032] In one embodiment, the staggered segmented infrared detection lens is further provided with a reinforcing rib connected between the junction and the wide-angle lens group on the side opposite to its light incident surface, wherein the connection relationship between the reinforcing rib and the wide-angle lens group is formed by connecting with the junction of the lens units of the wide-angle lens group.

[0033] In one embodiment, the reinforcing rib is provided in the form of a thin plate integrally formed with the junction portion and the wide-angle lens assembly.

[0034] In one embodiment, the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis, that the lower end of the wide-angle lens group on the same side of the central axis is flush with the lowest point of the light incident surface of the central lens group within a height error range of 3 mm.

[0035] According to another aspect of the present invention, the present invention further provides an infrared detection device, comprising:

[0036] An infrared detection lens, wherein the infrared detection lens is configured as a staggered segmented infrared detection lens, or has a symmetrical surface based on a surface-symmetrical structure formed by partial resection of the staggered segmented infrared detection lens, wherein the staggered segmented infrared detection lens has a central lens group, a wide-angle lens group staggered relative to the central lens group, and an intersection connected between the central lens group and the wide-angle lens group, wherein the central lens group and the wide-angle lens group are both lens groups formed by an array arrangement of multiple lens units, wherein the axis passing through the physical center point of the light-entering surface of the central lens group and perpendicular to the light-entering surface of the central lens group is the central axis of the central lens group, and the axis along the central axis with the direction of the light-entering surface of the central lens group as the base The central axis is located on the symmetry plane of the infrared detection lens, and the central lens group and the wide-angle lens group satisfy the following conditions on the same cross section along the central axis: the light-entry surface of the wide-angle lens group faces away from the central axis, the lower end of the wide-angle lens group on the same side of the central axis is lower than the outer edge of the central lens group, and is away from the central axis relative to the outer edge of the central lens group, the upper end of the wide-angle lens group on the same side of the central axis is not lower than the outer edge of the central lens group, and is away from the central axis relative to the lower end of the wide-angle lens group, wherein for a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group, the focus of the lens unit of the wide-angle lens group on this side in this cross section is located above the line;

[0037] a housing, wherein the housing has a mirror window communicating with an interior space of the housing and an exterior space, wherein the infrared detection lens is mounted on the mirror window with its light incident surface facing the exterior space of the housing; and

[0038] At least one pyroelectric infrared sensor is disposed in the inner space of the housing with its sensing surface facing the infrared detection lens.

[0039] In one embodiment, wherein the smallest focal length among the lens units of the central lens group is f, the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis: a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group intersects the central axis at a point P, and the height of point P relative to the central lens group along the central axis is less than f.

[0040] In one embodiment, the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis, that the upper end of the wide-angle lens group on the same side of the central axis is not lower than the outer edge of the central lens group.

[0041] In one embodiment, the light incident surface of the central lens group is set to be a plane, and the wide-angle lens group is arranged around the central lens group and is connected to the outer edge of the central lens group via the junction at its lower end.

[0042] In one embodiment, the central lens group is arranged on a cross section along the central axis to further satisfy: the central lens group has a structural form with a low middle and high ends, and the corresponding central lens group is designed to be sunken and has an outer edge higher than the main body, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end through the intersection when it is arranged around the central lens group.

[0043] In one embodiment, the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis, that the lower end of the wide-angle lens group on the same side of the central axis is flush with the lowest point of the light incident surface of the central lens group within a height error range of 3 mm.

[0044] In one embodiment, the window edge of the mirror window has a structural design of being higher inside and lower outside, wherein the outer end of the window edge of the mirror window with the structural design of being higher inside and lower outside is flush with the lowest point of the light incident surface of the central lens group within a height error range of 5 mm.

[0045] In one embodiment, the height difference between the optical centers of any two lens units of the staggered segmented infrared detection lens along the central axis is less than or equal to 5 mm.

[0046] In one embodiment, the infrared detection lens is configured to be a strip-surface symmetrical structure formed by partial resection of the staggered segmented infrared detection lens, and has the central lens group in a strip-shaped form and the junction portion and the wide-angle lens group extending sequentially at two opposite ends of the central lens group.

[0047] In one embodiment, the infrared detection lens is configured to correspond to a structural form in which the staggered segmented infrared detection lens is cut in half along the central axis.

[0048] In one embodiment, the number of the pyroelectric infrared sensor is one, and the sensor has a sensing surface that is inclined with respect to the central axis and faces the infrared detection lens.

[0049] In one embodiment, there are a plurality of pyroelectric infrared sensors, and each of the pyroelectric infrared sensors has a different sensing surface orientation.

[0050] In one embodiment, at least two of the pyroelectric infrared sensors have staggered sensing surface orientations.

[0051] In one embodiment, the infrared detection device further includes at least one partition arranged in the internal space of the shell, wherein the partition extends from between different pyroelectric infrared sensors toward the staggered segmented infrared detection lens to form compartments corresponding to the corresponding pyroelectric infrared sensors.

[0052] In one embodiment, the staggered segmented infrared detection lens and the housing are set to the same color of white.

[0053] In one embodiment, the infrared detection device is further provided with a shielding cover, wherein the shielding cover is covered below the mirror cloth window and has an opening, wherein part of the lens unit of the staggered segmented infrared detection lens is exposed to the opening.

[0054] In one embodiment, the shielding cover includes a plurality of bottom shielding sheets and side shielding sheets, wherein the bottom shielding sheet is arranged around the opening and connected in sequence to form an annular shielding sheet, and the side shielding sheets are connected to the outer edge of the annular shielding sheet, and are connected in sequence around the annular shielding sheet on the side of the annular shielding sheet to form an annular shielding wall, corresponding to the state in which the shielding cover has the annular shielding sheet as the bottom, and the annular shielding wall is a side wall extending laterally from the outer edge of the annular shielding sheet, wherein the connection areas between the connected bottom shielding sheets, between the annular shielding sheet and the annular shielding wall, between the connected side shielding sheets, and between the annular shielding wall and the shielding cover are preset fracture areas, wherein the preset fracture areas are connection structures that can be controlled to fracture by local thinning and / or punching.

[0055] In one embodiment, the shielding cover and the staggered segmented infrared detection lens are set to the same color of white.

[0056] 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

[0057] Figure 1 This is a schematic diagram of the structural principle of an existing infrared detection device.

[0058] Figure 2A FIG. 4 is a schematic diagram of the three-dimensional structure of a staggered segmented infrared detection lens according to an embodiment of the present invention.

[0059] Figure 2B Schematic diagram of a cross-sectional structure of the staggered segmented infrared detection lens according to the above embodiment of the present invention.

[0060] Figure 3AFIG2 is a schematic diagram of the three-dimensional structure of a staggered segmented infrared detection lens according to another embodiment of the present invention.

[0061] Figure 3B 3D is a schematic diagram of the three-dimensional structure of the staggered segmented infrared detection lens according to the above embodiment of the present invention at another viewing angle.

[0062] Figure 3C Schematic diagram of a cross-sectional structure of the staggered segmented infrared detection lens according to the above embodiment of the present invention.

[0063] Figure 4A FIG1 is a schematic diagram of a cross-sectional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0064] Figure 4B FIG1 is a schematic diagram of a cross-sectional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0065] Figure 5A 1 is a cross-sectional structure comparison diagram of the staggered segmented infrared detection lens according to one of the above embodiments of the present invention relative to the overall convex light incident surface shape under the same effective light incident angle design.

[0066] Figure 5B 1 is a cross-sectional structure comparison diagram of the staggered segmented infrared detection lens according to another embodiment of the present invention relative to the overall convex light incident surface under the same effective light incident angle design.

[0067] Figure 6 The figure is a schematic diagram of a vertical detection application scenario of an infrared detection device equipped with the staggered segmented infrared detection lens according to one of the above embodiments of the present invention.

[0068] Figure 7A FIG. 1 is a schematic diagram of the three-dimensional structure of an infrared detection device according to an embodiment of the present invention.

[0069] Figure 7B Schematic diagram of the cross-sectional structure of the infrared detection device according to the above embodiment of the present invention.

[0070] Figure 8A Schematic diagram of outdoor detection application scenario of the infrared detection device according to the above embodiment of the present invention.

[0071] Figure 8B Schematic diagram of outdoor detection application scenario of the infrared detection device according to the above embodiment of the present invention.

[0072] Figure 9 Schematic diagram of outdoor detection application scenarios of the infrared detection device with different shell shape designs according to the above embodiment of the present invention.

[0073] Figure 10A FIG2 is a schematic diagram of a three-dimensional structure of an infrared detection device further provided with a shielding cover according to an embodiment of the present invention.

[0074] Figure 10B This is a schematic diagram of the three-dimensional structure of the infrared detection device according to the above embodiment of the present invention, in which a shielding cover is further provided.

[0075] Figure 10C This is a schematic diagram of the three-dimensional structure of the infrared detection device according to the above embodiment of the present invention, in which a shielding cover is further provided.

[0076] Figure 10D This is a schematic diagram of the three-dimensional structure of the infrared detection device according to the above embodiment of the present invention, in which a shielding cover is further provided.

[0077] Figure 11A Schematic diagram of a shielding cover structure of the infrared detection device according to the above embodiment of the present invention.

[0078] Figure 11B Schematic diagram of a usage scenario of the shielding cover of the infrared detection device according to the above embodiment of the present invention.

[0079] Figure 12A This is a schematic cross-sectional structural diagram of the infrared detection device according to the above embodiment of the present invention further provided with a partition.

[0080] Figure 12B This is a schematic cross-sectional structural diagram of the infrared detection device according to the above embodiment of the present invention further provided with a partition.

[0081] Figure 12C Schematic diagram of the staggered layout of pyroelectric infrared sensors of the infrared detection device according to the above embodiment of the present invention.

[0082] Figure 13A FIG. 4 is a schematic diagram of a cross-sectional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0083] Figure 13B FIG. 4 is a schematic diagram of a cross-sectional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0084] Figure 14A FIG. 4 is a schematic diagram of the three-dimensional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0085] Figure 14B FIG. 4 is a schematic diagram of the three-dimensional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0086] Figure 15A FIG. 4 is a schematic diagram of the three-dimensional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0087] Figure 15B FIG. 4 is a schematic diagram of the three-dimensional structure of the staggered segmented infrared detection lens according to another embodiment of the present invention.

[0088] Figure 16 FIG. 1 is a schematic diagram illustrating an application of an infrared detection device for outdoor detection in a side-mounted scenario according to an embodiment of the present invention. DETAILED DESCRIPTION

[0089] 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.

[0090] 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.

[0091] 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.

[0092] The present invention provides a staggered segmented infrared detection lens and an infrared detection device, wherein the staggered segmented infrared detection lens, based on the staggered segmented light entrance surface design, can take into account both the requirements of large light entrance surface area and small volume under a fixed effective light entrance angle design, thereby facilitating the miniaturization design of the infrared detection device while ensuring the detection accuracy of the infrared detection device with a large light entrance surface area design.

[0093] Specifically, refer to the accompanying drawings of the present invention. Figure 2A and Figure 2BAs shown, the structure of a staggered segmented infrared detection lens according to an embodiment of the present invention is schematically illustrated. The staggered segmented infrared detection lens 10 has a central lens group 11, a wide-angle lens group 12 that is staggered relative to the central lens group 11, and a junction 13 connected between the central lens group 11 and the wide-angle lens group 12, wherein the central lens group 11 and the wide-angle lens group 12 are both lens groups formed by an array arrangement of multiple lens units 100, wherein the physical center point of the light-entering surface 110 of the central lens group 11 and perpendicular to the central lens group 11 is passed through. The axis of the light-entering surface 110 is the central axis 111 of the central lens group 11, and along the central axis 111, with the light-entering surface 110 of the central lens group 11 as the bottom direction, the central lens group 11 and the wide-angle lens group 12 meet the following conditions on the same cross section along the central axis 111: the light-entering surface 120 of the wide-angle lens group 12 faces away from the central axis 111, and the lower end of the wide-angle lens group 12 on the same side of the central axis 111 is lower than the outer edge of the central lens group 11 and is relative to the central lens group 11. The outer edge of the central lens group 11 is away from the central axis 111, and the outer edge of the wide-angle lens group 12 on the same side of the central axis 111 is not lower than the outer edge of the central lens group 11, and is away from the central axis 111 relative to the lower end of the wide-angle lens group 12, wherein for the line connecting the lower end of the wide-angle lens group 12 on the same side of the central axis 111 to the outer edge of the central lens group 11, the focus of the lens unit 100 of the wide-angle lens group 12 on this side in the cross section is located above the line, as shown in FIG. In this way, the staggered segmented infrared detection lens 10 has a staggered segmented light-entry surface design, and when the light-entry surface of the staggered segmented infrared detection lens 10 is designed with a staggered segmentation, the junction 13 connected between the central lens group 11 and the wide-angle lens group 12 is avoided from blocking the effective light-entry angle of the wide-angle lens group 12. Therefore, compared with the overall convex light-entry surface shape, the staggered segmented light-entry surface design can take into account both the large light-entry surface area requirements and the small volume requirements under a fixed effective light-entry angle design.

[0094] In particular, further assuming that the smallest focal length of the lens units 100 of the central lens group 11 is f, the central lens group 11 and the wide-angle lens group 12 preferably satisfy the following conditions on the same cross-section along the central axis 111: a line connecting the lower end of the wide-angle lens group 12 on the same side of the central axis 111 to the outer edge of the central lens group 11 intersects the central axis 111 at a point P, and the height of point P relative to the central lens group 11 along the central axis 111 is less than f. In this way, when a single pyroelectric infrared sensor is used in the corresponding infrared detection device, the junction 13 between the central lens group 11 and the wide-angle lens group 12 is prevented from blocking the effective light entry angle of either lens group.

[0095] Specifically, in this embodiment of the present invention, the light-entering surface 110 of the central lens group 11 is set to be a plane, and the wide-angle lens group 12 is connected to the outer edge of the central lens group 11 at its lower end via the junction 13 when it is arranged around the central lens group 11, so as to form a structural form in which the wide-angle lens group 12 is staggered relative to the central lens group 11. While obtaining a relatively beautiful visual experience based on the plane design of the light-entering surface 110 of the central lens group 11, based on the staggered design of the wide-angle lens group 12 relative to the central lens group 11, the requirements of large light-entering surface area and small volume are taken into account.

[0096] It is worth mentioning that in some embodiments of the present invention, the central lens group 11 is arranged on a cross section along the central axis 111 to further satisfy: the central lens group 11 has a structural form that is low in the middle and high at both ends, and the corresponding central lens group 11 is sunken in design and has an outer edge higher than the main body, and the wide-angle lens group 12 is connected to the outer edge of the central lens group 11 at the lower end of the wide-angle lens group 12 via the junction 13 when it is arranged around the central lens group 11, so as to form a structural form in which the wide-angle lens group 12 is staggered relative to the central lens group 11, and based on the sunken design of the central lens 11 group and the staggered design of the wide-angle lens group 12 relative to the central lens group 11, while taking into account the requirements of large light-entry surface area and small volume, the structural strength of the staggered segmented infrared detection lens is guaranteed and it is conducive to obtaining a relatively beautiful visual experience.

[0097] For example, referring to the accompanying drawings of the present invention, Figures 3A to 3CAs shown, corresponding to the central lens group 11 having a structural form with a low middle and high two ends in the cross section along the central axis 111, the central lens group 11 is specifically designed to have a light-incoming surface 110 consisting of a bottom light-incoming surface 1101 and a plurality of side light-incoming surfaces 1102 arranged around the bottom light-incoming surface 1101 and inclined to the bottom light-incoming surface 1101.

[0098] Specifically in this embodiment of the present invention, the bottom light-incoming surface 1101 and the side light-incoming surface 1102 of the central lens group 11 are both planes.

[0099] It can be understood that, corresponding to the central lens group 11 having a structural form with a low middle and high ends in the cross section along the central axis 111, the form of the light-entering surface 110 of the central lens group 11 is diverse, and the present invention is not limited to this. For example, in the state where the bottom light-entering surface 1101 of the central lens group 11 is a plane, each of the side light-entering surfaces 1102 can also be designed as a curved surface, or as a whole as an annular inclined surface inclined to the bottom light-entering surface 1101. For another example, the light-entering surface 110 of the central lens group 11 corresponds to Figure 4A or Figure 4B The overall design is a spherical section.

[0100] Further, referring to the accompanying drawings of the present invention, Figure 5A and Figure 5B As shown, the staggered segmented infrared detection lens 10 according to the above two embodiments of the present invention is compared with the overall convex light-entry surface shape. Under the same effective light-entry angle design, it is possible to ensure the detection accuracy of the infrared detection device in the wide-angle direction with a large wide-angle light-entry surface area design, and has a size that is relatively compressed in the convex direction, which is conducive to reducing the volume of the staggered segmented infrared detection lens 10 while taking into account the miniaturization design of the infrared detection device.

[0101] It is understandable that if Figure 6As shown, taking the vertical detection application scenario of the infrared detection device as an example, the movement of the detected target on the target detection surface (ground) will cause a change in the distance between the detected target and the infrared detection device, and will move away from the infrared detection device when moving away from the projection point of the infrared detection device on the target detection surface. Therefore, based on the characteristic that the energy of infrared light is weakened as the detected target moves away from the infrared detection device, the staggered segmented infrared detection lens 10 of the present invention can ensure the detection accuracy of the infrared detection device in the wide-angle direction based on the large wide-angle light-inlet surface area design, and based on the staggered segmented light-inlet surface design, in the state where the detection accuracy of the infrared detection device in the wide-angle direction is ensured by the large wide-angle light-inlet surface area design, compared with the overall convex light-inlet surface shape, it has a relatively compressed size in the convex direction, thereby being able to take into account the miniaturization design of the infrared detection device.

[0102] It is worth mentioning that, according to the two embodiments of the present invention, compared with the overall convex light-entry surface morphology, under the same effective light-entry angle design, the staggered segmented structural design of the central lens group 11 and the wide-angle lens group 12 can ensure the structural strength of the staggered segmented infrared detection lens 10 based on the junction 13 connected between the central lens group 11 and the wide-angle lens group 12 when the lens units 100 of the central lens group 11 and the wide-angle lens group 12 are relatively thinned. Therefore, it is beneficial to reduce the light-entry loss of the staggered segmented infrared detection lens 10 based on the thinning of each lens unit 100 of the central lens group 11 and the wide-angle lens group 12 while meeting the requirements of impact resistance certification, thereby correspondingly improving the detection accuracy of the infrared detection device.

[0103] Furthermore, in these two embodiments of the present invention, the light-entry surface 120 of the wide-angle lens assembly 12 is designed to be formed by laterally splicing together a plurality of trapezoidal light-entry surfaces 1201. It is understood that, in the wide-angle lens assembly 12, each lens unit 100 is configured as a Fresnel lens, each lens unit 100 has a smooth surface, and a surface opposite to the smooth surface is designed with corresponding textures to give the lens unit 100 a light-gathering property. The smooth surface of each lens unit 100 constitutes the light-entry surface 120 of the wide-angle lens assembly 12, wherein each trapezoidal light-entry surface 1201 optionally corresponds to the smooth surface of one or more lens units 100.

[0104] It is understood that the lens unit 100 is a lens with focusing properties. For example, the lens unit 100 may be Figure 4BThe convex lens shown in the central lens group 11 may also be a Fresnel lens, or a lens with focusing properties formed on the basis of the structure of a convex lens and further designed based on the corresponding texture of the Fresnel lens, and the focal length and structure of each lens unit 100 are not limited to the same.

[0105] It is also understood that the light-entering surface 120 of the wide-angle lens assembly 12 can have various shapes, and the present invention is not limited thereto. For example, the light-entering surface 120 of the wide-angle lens assembly 12 can also be designed as an annular bevel as a whole. In the description of the present invention, an annular bevel corresponds to the shape of a section of a conical surface cut along the height direction of the cone. Corresponding to the state in which the light-entering surface 120 of the wide-angle lens assembly 12 is designed as an annular bevel as a whole, the smooth surface of each lens unit 100 of the wide-angle lens assembly 12 is not a flat surface.

[0106] In particular, in the present invention corresponding to Figures 3A to 3C In the embodiment, the central lens group 11 and the wide-angle lens group 12 further satisfy the following conditions on the same cross section along the central axis 111: the lower end of the wide-angle lens group 12 on the same side of the central axis 111 is flush with the lowest point of the light-entering surface 110 of the central lens group 11 within a height error range of 3 mm. In this way, the detection accuracy of the infrared detection device in the wide-angle direction is guaranteed while ensuring the area of the light-entering surface 120 of the wide-angle lens group 12. Compared with the overall convex light-entering surface shape, the size of the staggered segmented infrared detection lens 10 is further compressed in the convex direction, which is conducive to reducing the volume of the staggered segmented infrared detection lens 10 and obtaining a relatively beautiful visual experience.

[0107] It is worth mentioning that for the traditional Fresnel lens with an overall convex light-entry surface design, on the one hand, the overall convex design of the light-entry surface with a larger area will affect the aesthetics of the infrared detection device; on the other hand, the overall convex design of the light-entry surface with a larger area makes the Fresnel lens more susceptible to dust adhesion and aging due to sunlight exposure in outdoor use environments, which correspondingly increases the light input loss of the Fresnel lens with the increase in usage time, thereby reducing the accuracy of the corresponding infrared detection device; in addition, the overall convex design of the light-entry surface with a larger area also makes the Fresnel lens more susceptible to lateral wind and rain interference and cold and hot wind convection interference, thereby affecting the working stability of the corresponding infrared detection device.

[0108] The staggered segmented infrared detection lens 10 of the present invention is based on a staggered segmented light-entry surface design. Compared with the overall convex light-entry surface shape, it has a relatively compressed size in the convex direction. Therefore, when it is assembled on the infrared detection device, it can reduce the probability of being disturbed by wind and rain and cold and hot wind convection, and at the same time reduce the amount of dust falling and the sunlight area, thereby ensuring the working stability of the infrared detection device and extending the service life of the infrared detection device.

[0109] Furthermore, although conventional Fresnel lenses with an overall convex light-entry surface design can also resist wind and rain interference and cold and hot wind convection interference, while simultaneously reducing dust fallout and the area of sunlight exposure, by recessing the Fresnel lens in the corresponding infrared detection device, given the larger dimensions of the Fresnel lens in the convex direction under the same effective light-entry angle design, to prevent the infrared detection device housing from blocking the Fresnel lens' light-entry angle, the recessed installation of the Fresnel lens in the infrared detection device requires a larger housing diameter for the infrared detection device.

[0110] In other words, the staggered segmented infrared detection lens 10 of the present invention is based on a staggered segmented light-entry surface design. Compared with the overall convex light-entry surface shape, it has a relatively compressed size in the convex direction. Therefore, compared with the overall convex light-entry surface shape, the infrared detection device has a smaller shell diameter requirement based on the recessed installation requirement. Therefore, the overall convex light-entry surface shape is conducive to the recessed installation of the staggered segmented infrared detection lens 10 in the infrared detection device, which is conducive to obtaining a relatively beautiful visual experience while taking into account the miniaturization design of the infrared detection device.

[0111] Specifically, refer to the accompanying drawings of the present invention. Figure 7A and Figure 7BAs shown, based on the requirement of recessed installation of the staggered segmented infrared detection lens 10 in the infrared detection device, the infrared detection device according to an embodiment of the present invention is schematically illustrated. The infrared detection device comprises the staggered segmented infrared detection lens 10, a housing 20 and at least one pyroelectric infrared sensor 30, wherein the housing 20 has a mirror window 201 connecting the internal space and the external space of the housing 20, wherein the staggered segmented infrared detection lens 10 is installed in the mirror window 201 with its light-entering surface facing the external space of the housing 20, and the pyroelectric infrared sensor 30 is arranged in the internal space of the housing 20 with its sensing surface facing the staggered segmented infrared detection lens 10, wherein along the central axis 111 with the light-entering surface 110 of the central lens group 11 as the bottom direction, the window edge of the mirror window 201 has a structural design with the inner side higher and the outer side lower, so as to form a recessed installation of the staggered segmented infrared detection lens 10 in the housing 20.

[0112] It is understandable that the structural design of the window edge of the mirror cloth window 201 should avoid blocking the light-entry angle of the staggered segmented infrared detection lens 10. Corresponding to the state in which the window edge of the mirror cloth window 201 is designed with a high-inside-low-outside structure based on the recessed installation requirement of the staggered segmented infrared detection lens 10, also based on the recessed installation requirement, the Fresnel lens with an overall convex light-entry surface has a larger diameter requirement for the window edge of the mirror cloth window 201 due to the larger recessed depth requirement. Therefore, the staggered segmented infrared detection lens 10 of the present invention is based on the staggered segmented light-entry surface design. Compared with the overall convex light-entry surface shape, based on the recessed installation requirement, it has a smaller shell diameter requirement for the infrared detection device. Therefore, the overall convex light-entry surface shape is conducive to the recessed installation of the staggered segmented infrared detection lens 10 in the infrared detection device, which is conducive to obtaining a relatively beautiful visual experience while taking into account the miniaturization design of the infrared detection device.

[0113] Preferably, when the staggered segmented infrared detection lens 10 is installed in a recessed manner in the shell 20, the center axis 111 is also along the light-entering surface 110 of the central lens group 11 as the bottom direction. When the central lens group 11 is designed to be recessed, the outer end of the window edge of the mirror window 201 with a structural design of high inside and low outside is flush with the lowest point of the light-entering surface 110 of the central lens group 11 within a height error range of 5 mm. This is conducive to reducing the volume of the infrared detection device and obtaining a relatively beautiful visual experience.

[0114] It is worth mentioning that in the corresponding Figure 8A and Figure 8BThe application scenario of the infrared detection device shown in the figure is based on the recessed installation of the staggered segmented infrared detection lens 10 in the shell 20. The infrared detection device can further reduce the probability of the staggered segmented infrared detection lens 10 being disturbed by wind and rain and cold and hot wind convection, and reduce the amount of dust falling and the sunlight area of the staggered segmented infrared detection lens 10, thereby helping to ensure the working stability of the infrared detection device and extend the service life of the infrared detection device.

[0115] In particular, in order to further reduce the probability of the staggered segmented infrared detection lens 10 being disturbed by wind and rain and cold and hot wind convection, and to reduce the amount of dust and the sunlight area of the staggered segmented infrared detection lens 10, the housing 20 may optionally correspond to Figure 9 The window edge of the mirror cloth window 201 has a surface shape that is pointed at the top and wide at the bottom, such as the window edge of the mirror cloth window 201 has a conical structure design with the window edge of the mirror cloth window 201 as the bottom and has a surface shape that is pointed at the top and wide at the bottom, or the window edge of the mirror cloth window 201 has a triangular prism structure design with the window edge of the mirror cloth window 201 as the side and has a surface shape that is pointed at the top and wide at the bottom.

[0116] Further, referring to the accompanying drawings of the present invention, 10A to 10D As shown, based on the structure of the infrared detection device of the above-mentioned embodiments of the present invention, the infrared detection device can be optionally further provided with a shielding cover 40, wherein the shielding cover 40 is covered below the cloth mirror window 201 and has an opening 401, so as to form a partitioned shielding of the light incident angle of the staggered segmented infrared detection lens 10 based on the shape design of the opening 401, corresponding to the state in which the staggered segmented infrared detection lens 10 can simultaneously cover the near zone (small angle direction) and the far zone (wide angle direction) based on the aforementioned structural design of the central lens group 11 and the wide-angle lens group 12, and the partitioned detection of the sensing area corresponding to the corresponding lens unit 100 exposed to the opening 401 is realized based on the shape design of the opening 401.

[0117] Specifically, in the corresponding Figure 10A In the infrared detection device, the opening 401 of the shielding cover 40 is designed to be circular and has a diameter corresponding to the outer edge of the junction 13, which can avoid blocking the light incident angle of the central lens group 11 while forming a shield for the wide-angle lens group 12, thereby realizing partitioned detection of the sensing area corresponding to each lens unit 100 of the central lens group 11.

[0118] In the corresponding Figure 10BIn the infrared detection device, the opening 401 of the shielding cover 40 is designed to be long and narrow so as to meet the detection requirements of a narrow and long detection area.

[0119] In the corresponding Figure 10C In the infrared detection device, the opening 401 of the shielding cover 40 is designed to be semicircular and can meet the downward detection requirements of the side-mounted scene.

[0120] In the corresponding Figure 10D In the infrared detection device, the opening 401 of the shielding cover 40 is designed to be semicircular and has an inner diameter corresponding to the outer edge of the junction 13, corresponding to blocking the wide-angle lens group 12 on half side while blocking the central lens group 11, thereby meeting the far-zone detection requirements of the side-mounted scene.

[0121] Further, referring to the accompanying drawings of the present invention, Figure 11A and Figure 11B As shown, a structural form of the shielding cover 40 and the corresponding usage scenario are illustrated, wherein the shielding cover 40 has an opening 401 and includes a plurality of bottom shielding pieces 41 and side shielding pieces 42, wherein the bottom shielding piece 41 is arranged around the opening 401 and is sequentially connected to form an annular shielding piece, and the side shielding pieces 42 are sequentially connected around the annular shielding piece in a state of being connected to the outer edge of the annular shielding piece to form an annular shielding wall, corresponding to the state in which the shielding cover 40 has the annular shielding piece as the bottom, the annular shielding wall is a side wall extending laterally from the outer edge of the annular shielding piece, wherein the connection areas between the connected bottom shielding pieces 41, between the annular shielding piece and the annular shielding wall, between the connected side shielding pieces 42, and between the annular shielding wall and the shielding cover 40 are preset fracture areas, wherein the preset fracture area is a connection structure that can achieve controllable fracture by local thinning and / or punching. In this way, the shielding cover 40 can be adjusted to block the light incident angle of the staggered segmented infrared detection lens 10 by peeling off the corresponding bottom shielding piece 41 and / or the side shielding piece 42 from the shielding cover 40, thereby meeting different detection area distribution requirements.

[0122] It is worth mentioning that in addition to being set according to the original color of the main material of the lens, in some embodiments of the present invention, in order to further enhance the aesthetics and concealment of the infrared detection device, the staggered segmented infrared detection lens 10 is preferably set to the same color as the shell 20. For example, when the shell 20 is set to white, the segmented infrared detection lens 10 is preferably white based on the addition of relevant color powder / colorant into the main material of the lens. In this way, the aesthetics and concealment of the infrared detection device are enhanced based on the feature that the staggered segmented infrared detection lens 10 is the same color as the shell 20.

[0123] Furthermore, when the infrared detection device is provided with the shielding cover 40, the shielding cover 40 is preferably set to the same color as the staggered segmented infrared detection lens 10. For example, when the segmented infrared detection lens 10 is white, the shielding cover 40 is preferably set to use white material and ensure that the shielding cover 40 blocks the infrared light by at least one of the following methods: thickening setting, selection of specific materials, and coating / attachment of light-isolating film.

[0124] In particular, in some embodiments of the present invention, the infrared detection device optionally corresponds to 12A to 12C There are multiple pyroelectric infrared sensors 30, wherein each pyroelectric infrared sensor 30 has a different sensing surface orientation, so as to improve the partition density of the corresponding sensing area and improve the resolution of the infrared detection device while further improving the detection accuracy of the infrared detection device.

[0125] Further, in the present invention corresponding to Figure 12A and Figure 12B In these two embodiments, the infrared detection device further includes at least one partition 14 disposed within the interior space of the housing 20, wherein the partition 14 extends from between different pyroelectric infrared sensors 30 toward the staggered segmented infrared detection lens 10 to form sub-compartments corresponding to the respective pyroelectric infrared sensors 30, enabling each pyroelectric infrared sensor 30 to form a corresponding sensing area via the lens unit 100 corresponding to the sub-compartment. Thus, based on the provision of the partition 14, when there are multiple pyroelectric infrared sensors 30, zoned detection corresponding to the corresponding sub-compartments is achieved.

[0126] Specifically, in the corresponding Figure 12A and Figure 12BIn the infrared detection device, the partition 14 can be optionally set to a conical plate structure that is narrow at the top and wide at the bottom and has an upper opening and a lower opening, wherein the sensing surface of at least one of the pyroelectric infrared sensors 30 faces the upper opening of the partition 14, and wherein the lower opening of the partition 14 is set around the outer edge of the central lens group 11, or is set around the middle part of the central lens group 11.

[0127] It is understood that the specific shape and number of the partitions 14 do not constitute a limitation on the infrared detection device of the present invention. In other embodiments of the present invention, the infrared detection device can also form compartments corresponding to the corresponding pyroelectric infrared sensors 30 based on the staggered arrangement of multiple partitions 14. Furthermore, the provision of the partitions 14 to form corresponding compartments within the interior space of the housing 20 can also hinder air flow within the interior space of the housing 20, thereby helping to reduce the impact of air convection within the interior space of the housing 20 on the pyroelectric infrared sensors 30, thereby ensuring the operational stability of the infrared detection device.

[0128] In particular, in the case corresponding to Figure 12C In the infrared detection device, at least two of the pyroelectric infrared sensors 30 have staggered sensing surface orientations, so that the focal length of the lens unit 100 matching the corresponding pyroelectric infrared sensor 30 can be increased without increasing the internal space of the shell 20, which is beneficial to reducing the light input loss of the staggered segmented infrared detection lens 10, and at the same time, based on the reuse of the corresponding lens units 100, the detection angle and resolution of the infrared detection device are guaranteed.

[0129] Furthermore, as mentioned above, in the state where the central lens group 11 and the wide-angle lens group 12 are designed to be staggered and segmented, the structural strength of the staggered segmented infrared detection lens 10 can be ensured based on the junction 13 connected between the central lens group 11 and the wide-angle lens group 12, so that each of the lens units 100 of the central lens group 11 and the wide-angle lens group 12 can be relatively thinned. In order to further ensure the structural strength of the staggered segmented infrared detection lens 10, in some embodiments of the present invention, the staggered segmented infrared detection lens 10 optionally corresponds to Figure 13A and Figure 13BA reinforcing rib 15 is further provided on the side opposite the light-entering surface, connecting between the junction 13 and the wide-angle lens assembly 12. The connection between the reinforcing rib 15 and the wide-angle lens assembly 12 is preferably formed by connecting to the intersection of the lens units 100 of the wide-angle lens assembly 12. In this way, while the structural strength of the staggered segmented infrared detection lens 10 is enhanced by the provision of the reinforcing rib 15, the loss of infrared light passing through the staggered segmented infrared detection lens 10 caused by the reinforcing rib 15 is reduced.

[0130] Furthermore, in the corresponding Figure 13A and Figure 13B In the embodiment, the reinforcing rib 15 is provided in the form of a thin plate integrally formed with the junction 13 and the wide-angle lens group 12, so as to avoid additional process steps caused by the provision of the reinforcing rib 15, and can effectively strengthen the structural strength between the wide-angle lens group 12 and the junction 13 to strengthen the structural strength of the staggered segmented infrared detection lens 10, while reducing or even avoiding the loss of infrared light passing through the staggered segmented infrared detection lens 10 caused by the reinforcing rib 15.

[0131] Further reference is made to the accompanying drawings of the present invention. Figure 14A and Figure 14B As shown, the staggered segmented infrared detection lens 10 has the central lens group 11 arranged in a strip shape and the junction portion 13 and the wide-angle lens group 12 sequentially extending at two opposite ends of the central lens group 11. In this way, when the corresponding infrared detection device is not provided with the shielding cover 40, the staggered segmented infrared detection lens 10 can correspond to the state of the infrared detection device. Figure 10B The infrared detection device shown meets the detection requirements of a narrow and long detection area.

[0132] Specifically in Figure 14A and Figure 14B In the staggered segmented infrared detection lens 10 shown in FIG. 1 , the staggered segmented infrared detection lens 10 is equivalent to Figure 2A and Figure 3AThe structural form formed by partially cutting off the two opposite sides of the staggered segmented infrared detection lens 10 of the corresponding embodiment, the central lens group 11 and the wide-angle lens group 12 of the corresponding staggered segmented infrared detection lens 10 still meet the following requirements on the same cross section along the central axis 111: the light-incoming surface 120 of the wide-angle lens group 12 faces away from the central axis 111, and the lower end of the wide-angle lens group 12 on the same side of the central axis 111 is lower than the outer edge of the central lens group 11 and is relatively close to the central lens group 11. The outer edge of the lens group 11 is away from the central axis 111, and the upper end of the wide-angle lens group 12 on the same side of the central axis 111 is not lower than the outer edge of the central lens group 11, and is away from the central axis 111 relative to the lower end of the wide-angle lens group 12, wherein the line connecting the lower end of the wide-angle lens group 12 on the same side of the central axis 111 to the outer edge of the central lens group 11 intersects the central axis 111 at a point P, and the height of point P relative to the central lens group 11 along the central axis 111 is less than f.

[0133] In particular, reference is made to the accompanying drawings of the present invention. Figure 15A and Figure 15B As shown, the staggered segmented infrared detection lens 10 is respectively Figure 2A and Figure 3A The structure of the staggered segmented infrared detection lens 10 is cut in half along the central axis 111, corresponding to the Figure 2A and Figure 3A The staggered segmented infrared detection lens 10 shown in FIG. 1 can be cut along the central axis 111 to form Figure 15A and Figure 15B The staggered segmented infrared detection lens 10 is shown. Based on the structural form of the staggered segmented infrared detection lens 10, the corresponding Figure 10C The infrared detection device shown meets the downward detection requirements of side-mounted scenarios.

[0134] In particular, further reference is made to the accompanying drawings of the present invention. Figure 16 As shown, Figure 15B The application of the staggered segmented infrared detection lens 10 in the side-mounted scenario is exemplified. The number of the pyroelectric infrared sensor 30 is one and preferably corresponds to Figure 16 The sensing surface of the infrared detection lens 10 is inclined to the central axis 111 and faces the staggered segmented infrared detection lens 10, so that the staggered segmented infrared detection lens 10 is Figure 2A or Figure 3AThe structure of the staggered segmented infrared detection lens 10 shown in FIG. 1 is based on the state in which it is cut in half along the central axis 111, which is beneficial to reducing the inclination of the effective light input path of the lens unit 100 of the wide-angle lens group 12 in the direction perpendicular to the light input surface 120 of the wide-angle lens group 12, which is correspondingly beneficial to reducing the light input loss of the staggered segmented infrared detection lens 10 and improving the detection accuracy of the infrared detection device.

[0135] It is worth mentioning that in the above-mentioned embodiments of the present invention, the optical centers of each lens unit 100 of the central lens group 11 and the wide-angle lens group 12 are preferably at the same height within an error range of 5 mm along the central axis 111, that is, the height difference of the optical centers of any two lens units 100 of the staggered segmented infrared detection lens 10 along the central axis 111 is less than or equal to 5 mm. In this way, the focal lengths of each lens unit 100 of the staggered segmented infrared detection lens 10 are different based on the structural form of the staggered arrangement of the wide-angle lens group 12 relative to the central lens group 11, which reduces the difference in the projection area of the sensing surface of the pyroelectric infrared sensor 30 on the corresponding detection surface (such as the ground) through each lens unit 100, which is correspondingly beneficial to improving the radial sensitivity of the infrared detection device.

[0136] It is understandable that when the staggered segmented infrared detection lens 10 is Figure 2A or Figure 3A When the structure of the staggered segmented infrared detection lens 10 shown is cut in half along the central axis 111, in the description of the present invention, the central axis 111 of the central lens group 11 of the staggered segmented infrared detection lens 10 after being cut in half should still be based on the central axis 111 of the central lens group 11 before being cut in half. Therefore, in order to avoid ambiguity in understanding, in some descriptions of the present invention, the staggered segmented infrared detection lens 10 still corresponds to the aforementioned description, with the axis passing through the physical center point of the light-entering surface 110 of the central lens group 11 and perpendicular to the light-entering surface 110 of the central lens group 11 as the central axis 111 of the central lens group 11, and the infrared detection device can be described as including an infrared detection lens, wherein the infrared detection lens is configured as the staggered segmented infrared detection lens 10, or has a symmetrical plane based on a surface-symmetrical structure formed by partial resection of the staggered segmented infrared detection lens 10, wherein the central axis 111 of the central lens group 11 is located on the symmetrical plane of the infrared detection lens, then the infrared detection lens structurally covers Figures 14A to 15B The structural form shown.

[0137] 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.

[0138] 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. Displacement segmented infrared detection lens, characterized in that: include: a central lens group, wherein the central lens group is a lens group formed by an array arrangement of a plurality of lens units; a wide-angle lens group, wherein the wide-angle lens group is a lens group formed by an array of multiple lens units and is staggered relative to the central lens group; as well as A junction portion, wherein the junction portion is connected between the central lens group and the wide-angle lens group, wherein the axis passing through the physical center point of the light-entering surface of the central lens group and perpendicular to the light-entering surface of the central lens group is the central axis of the central lens group, and the direction of the light-entering surface of the central lens group along the central axis is the bottom direction, and the central lens group and the wide-angle lens group meet the following conditions on the same cross section along the central axis: the light-entering surface of the wide-angle lens group faces away from the central axis, the lower end of the wide-angle lens group on the same side of the central axis is lower than the outer edge of the central lens group and is away from the central axis relative to the outer edge of the central lens group, and the upper end of the wide-angle lens group on the same side of the central axis is away from the central axis relative to the lower end of the wide-angle lens group, wherein for a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group, the focus of the lens unit of the wide-angle lens group on this side in this cross section is located above the line.

2. The staggered segmented infrared detection lens according to claim 1, wherein the smallest focal length among the lens units of the central lens group is f, and the central lens group and the wide-angle lens group further satisfy on the same cross-section along the central axis: a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group intersects the central axis at a point P, and the height of point P relative to the central lens group along the central axis is less than f.

3. The staggered segmented infrared detection lens according to claim 2, wherein the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis, that the upper end of the wide-angle lens group on the same side of the central axis is not lower than the outer edge of the central lens group.

4. The staggered segmented infrared detection lens according to claim 2, wherein the light-entering surface of the central lens group is set to be a plane, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end via the intersection when it is arranged around the central lens group.

5. The staggered segmented infrared detection lens according to claim 2, wherein the central lens group is arranged on a cross section along the central axis and further satisfies: the central lens group has a structural form that is low in the middle and high at both ends, and the corresponding central lens group is sunken in design and has an outer edge that is higher than the main body, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end through the intersection when it is arranged around the central lens group.

6. The staggered segmented infrared detection lens according to claim 5, wherein the central lens group is designed to have a light-incoming surface consisting of a bottom light-incoming surface and a plurality of lateral light-incoming surfaces arranged around the bottom light-incoming surface and inclined to the bottom light-incoming surface. 7 . The staggered segmented infrared detection lens according to claim 6 , wherein the bottom light-incoming surface and the side light-incoming surface of the central lens group are both planes.

8. The staggered segmented infrared detection lens according to claim 6, wherein the bottom light-incoming surface of the central lens group is a plane, and each of the side light-incoming surfaces is integrally designed as an annular inclined surface inclined to the bottom light-incoming surface. 9 . The staggered segmented infrared detection lens according to claim 5 , wherein the light incident surface of the central lens group is designed as a spherical section as a whole.

10. The staggered segmented infrared detection lens according to any one of claims 1 to 9, wherein the light-incoming surface of the wide-angle lens group is designed to be formed by laterally splicing a plurality of trapezoidal light-incoming surfaces.

11. The staggered segmented infrared detection lens according to any one of claims 1 to 9, wherein the light incident surface of the wide-angle lens group is designed as a circular inclined surface as a whole.

12. The staggered segmented infrared detection lens according to any one of claims 1 to 9, wherein the height difference between the optical centers of any two lens units of the staggered segmented infrared detection lens along the central axis is less than or equal to 5 mm.

13. The staggered segmented infrared detection lens according to any one of claims 1 to 9, wherein the staggered segmented infrared detection lens is further provided with a reinforcing rib connected between the junction and the wide-angle lens group on the side opposite to its light incident surface, wherein the connection relationship between the reinforcing rib and the wide-angle lens group is formed by connection with the junction of the lens units of the wide-angle lens group. 14 . The staggered segmented infrared detection lens according to claim 13 , wherein the reinforcing rib is provided in the form of a thin plate integrally formed with the junction portion and the wide-angle lens assembly.

15. The staggered segmented infrared detection lens according to any one of claims 5 to 9, wherein the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis: the lower end of the wide-angle lens group on the same side of the central axis is flush with the lowest point of the light incident surface of the central lens group within a height error range of 3 mm.

16. Infrared detection device, characterized in that, include: An infrared detection lens, wherein the infrared detection lens is configured as a staggered segmented infrared detection lens, or has a symmetrical surface based on a surface-symmetrical structure formed by partial resection of the staggered segmented infrared detection lens, wherein the staggered segmented infrared detection lens has a central lens group, a wide-angle lens group staggered relative to the central lens group, and an intersection connected between the central lens group and the wide-angle lens group, wherein the central lens group and the wide-angle lens group are both lens groups formed by an array arrangement of multiple lens units, wherein an axis passing through the physical center point of the light-entering surface of the central lens group and perpendicular to the light-entering surface of the central lens group is the central axis of the central lens group, and an axis along the central axis with the central lens group as the center axis is the center axis of the central lens group. The light-entering surface is oriented downward, the central axis is located on the symmetry plane of the infrared detection lens, and the central lens group and the wide-angle lens group satisfy the following conditions on the same cross section along the central axis: the light-entering surface of the wide-angle lens group faces away from the central axis, the lower end of the wide-angle lens group on the same side of the central axis is lower than the outer edge of the central lens group and is away from the central axis relative to the outer edge of the central lens group, and the upper end of the wide-angle lens group on the same side of the central axis is away from the central axis relative to the lower end of the wide-angle lens group, wherein for a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group, the focal point of the lens unit of the wide-angle lens group on this side in this cross section is located above the line; a housing, wherein the housing has a mirror window communicating with an interior space of the housing and an exterior space, wherein the infrared detection lens is mounted on the mirror window with its light incident surface facing the exterior space of the housing; as well as At least one pyroelectric infrared sensor is disposed in the inner space of the housing with its sensing surface facing the infrared detection lens.

17. An infrared detection device according to claim 16, wherein the smallest focal length among the focal lengths of the lens units of the central lens group is f, and the central lens group and the wide-angle lens group further satisfy on the same cross-section along the central axis: a line connecting the lower end of the wide-angle lens group on the same side of the central axis to the outer edge of the central lens group intersects the central axis at a point P, and the height of point P relative to the central lens group along the central axis is less than f.

18. The infrared detection device according to claim 17, wherein the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis, that the upper end of the wide-angle lens group on the same side of the central axis is not lower than the outer edge of the central lens group.

19. The infrared detection device according to claim 17, wherein the light incident surface of the central lens group is set to be a plane, and the wide-angle lens group is connected to the outer edge of the central lens group through the intersection at its lower end when it is arranged around the central lens group.

20. The infrared detection device according to claim 17, wherein the central lens group is arranged on a cross section along the central axis to further satisfy: the central lens group has a structural form with a low middle and high ends, and the corresponding central lens group is designed to be sunken and has an outer edge higher than the main body, and the wide-angle lens group is connected to the outer edge of the central lens group at its lower end through the intersection when it is arranged around the central lens group.

21. The infrared detection device according to claim 20, wherein the central lens group and the wide-angle lens group further satisfy, on the same cross section along the central axis: the lower end of the wide-angle lens group on the same side of the central axis is flush with the lowest point of the light incident surface of the central lens group within a height error range of 3 mm.

22. The infrared detection device according to claim 21, wherein the window edge of the mirror window has a structural design of being higher inside and lower outside, wherein the outer end of the window edge of the mirror window with a structural design of being higher inside and lower outside is flush with the lowest point of the light incident surface of the central lens group within a height error range of 5 mm.

23. The infrared detection device according to claim 17, wherein the height difference between the optical centers of any two lens units of the staggered segmented infrared detection lens along the central axis is less than or equal to 5 mm.

24. The infrared detection device according to any one of claims 16 to 23, wherein the infrared detection lens is configured to be a strip-shaped surface-symmetrical structure formed based on partial resection of the staggered segmented infrared detection lens, and has the central lens group in a strip-shaped form and the junction portion and the wide-angle lens group extending sequentially at two opposite ends of the central lens group.

25. The infrared detection device according to any one of claims 16 to 23, wherein the infrared detection lens is arranged to correspond to a structural form in which the staggered segmented infrared detection lens is cut in half along the central axis. 26 . The infrared detection device according to claim 25 , wherein the number of the pyroelectric infrared sensor is one and the sensor has a sensing surface oriented to be inclined with respect to the central axis and toward the infrared detection lens. 27 . The infrared detection device according to claim 16 , wherein the number of the pyroelectric infrared sensors is plural, and each of the pyroelectric infrared sensors has a different sensing surface orientation.

28. The infrared detection device according to claim 27, wherein at least two of the pyroelectric infrared sensors have staggered sensing surface orientations.

29. The infrared detection device according to claim 27, wherein the infrared detection device further comprises at least one partition arranged in the internal space of the shell, wherein the partition extends from between different pyroelectric infrared sensors toward the staggered segmented infrared detection lens to form compartments corresponding to the corresponding pyroelectric infrared sensors.

30. The infrared detection device according to any one of claims 16 to 23, wherein the staggered segmented infrared detection lens and the housing are set to be the same color, white.

31. An infrared detection device according to any one of claims 16 to 23, wherein the infrared detection device is further provided with a shielding cover, wherein the shielding cover is covered below the mirror cloth window and has an opening, wherein part of the lens unit of the staggered segmented infrared detection lens is exposed to the opening.

32. An infrared detection device according to claim 31, wherein the shielding cover includes a plurality of bottom shielding sheets and side shielding sheets, wherein the bottom shielding sheet is arranged around the opening and connected in sequence to form an annular shielding sheet, and the side shielding sheets are connected to the outer edge of the annular shielding sheet, and are connected in sequence around the annular shielding sheet on the side of the annular shielding sheet to form an annular shielding wall, corresponding to the state in which the shielding cover has the annular shielding sheet as the bottom, and the annular shielding wall is a side wall extending laterally from the outer edge of the annular shielding sheet, wherein the connection areas between the connected bottom shielding sheets, between the annular shielding sheet and the annular shielding wall, between the connected side shielding sheets, and between the annular shielding wall and the shielding cover are preset fracture areas, wherein the preset fracture area is a connection structure that can be controlled to fracture by local thinning and / or punching.

33. The infrared detection device according to claim 32, wherein the shielding cover and the staggered segmented infrared detection lens are set to the same color of white.

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