Staggered segmented infrared detection lens and infrared detection device

Abstract

The utility model provides a kind of staggered segmented infrared detection lens and infrared detection device, wherein the staggered segmented infrared detection lens has a central lens group and a wide-angle lens group being staggered arranged relative to the central lens group, and based on the staggered arrangement between the central lens group and the wide-angle lens group has the staggered segmented light entrance face design compared with the overall convex light entrance face form has in the convex direction relatively compressed size, wherein the light entrance face of the wide-angle lens group is formed by a plurality of planar splicing, and compared with the arc convex light entrance face form avoids the reflection / refraction of incident infrared light, to improve the light gathering efficiency of each lens unit of the wide-angle lens group, so as to facilitate the design of large light entrance face area to ensure the detection accuracy of the infrared detection device, and the miniaturization design of the infrared detection device is also considered.

Description

Technical Field

[0001] This utility model relates to the field of infrared detection, and in particular to a misaligned segmented infrared detection lens and an infrared detection device. Background Technology

[0002] With the development of IoT technology and the popularization of low-carbon and environmentally friendly concepts, artificial intelligence, smart home, and smart security technologies are increasingly demanding environmental detection, especially human movement detection. This allows for intelligent control of electrical equipment's operating status by controlling the detection results of human presence or absence. For example, intelligent low-carbon lighting can be achieved by controlling the lighting status of lamps based on the detection results of human presence or absence.

[0003] Among existing technologies for detecting human presence, the most widely used and mature technology is based on using Fresnel lenses to partition a detection area and then using a pyroelectric infrared (PIR) sensor to detect cross-regional movements of the human body within that area. The corresponding infrared detection device corresponds to... Figure 1 The structural principle includes a Fresnel lens 10P and a pyroelectric infrared sensor 20P, exemplified by a binary pyroelectric infrared sensor 20P. The Fresnel lens 10P has a light-receiving surface 101P, and on the side opposite the light-receiving surface 101P, a lens array composed of multiple lens units 11P is formed based on a corresponding texture design. Each lens unit 11P is a convex lens with light-gathering characteristics. The pyroelectric sensor 20P is positioned on the side of the Fresnel lens 10P opposite the light-receiving surface 101P. The effective light-gathering angle of the Fresnel lens 10P is given by angle θ in the figure. When the effective light-gathering angle of the Fresnel lens 10P is fixed, the number of lens units 11P is related to the number of sensing areas per unit angle range, and thus to the resolution of the infrared detection device. When the number of lens units 11P is fixed, the area of ​​the light-gathering surface 101P of the Fresnel lens 10P is related to the light intensity of each lens unit 11P, and thus to the detection accuracy of the infrared detection device. To balance the resolution and detection accuracy of the infrared detection device, the light-gathering surface 101P of the Fresnel lens 10P is typically designed to have a large area, especially when the infrared detection device requires a large detection angle. Correspondingly, the light-gathering surface 101P of the Fresnel lens 10P, with its large area, is typically convex and curved. Utility Model Content

[0004] One objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device. The staggered segmented infrared detection lens, based on a staggered segmented light-gathering surface design, can balance the requirements of a large light-gathering area and a small volume under a fixed effective light-gathering angle design. Therefore, it is beneficial to ensure the detection accuracy of the infrared detection device while taking into account the miniaturization design of the infrared detection device, with a large light-gathering surface area design.

[0005] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device. The staggered segmented infrared detection lens is based on a staggered segmented light-gathering surface design. While ensuring the detection accuracy of the infrared detection device with a large light-gathering surface area, it has a compressed size in the outward convex direction compared to the existing overall convex arc design of the light-gathering surface. Therefore, it is beneficial to reduce the volume of the staggered segmented infrared detection lens while taking into account the miniaturization design of the infrared detection device.

[0006] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device. The staggered segmented infrared detection lens is based on a staggered segmented light-incoming surface design. While ensuring the detection accuracy of the infrared detection device with a large light-incoming surface area, it can also reduce the volume. Therefore, it can adopt a planar light-incoming surface design to avoid or reduce the reflection / refraction of incident light, thereby further ensuring the light-incoming intensity of the corresponding lens unit.

[0007] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device. The staggered segmented infrared detection lens is based on a staggered segmented light-receiving surface design. While ensuring the detection accuracy of the infrared detection device with a large light-receiving surface area, it can also reduce the size. This breaks through the conventional thinking of those skilled in the art who design the light-receiving surface as an outwardly convex arc in pursuit of a large detection angle. It is beneficial to maintain a small size while using a planar light-receiving surface design to avoid or reduce the reflection / refraction of incident light, thereby further ensuring the light intensity of the corresponding lens unit and improving the detection accuracy of the infrared detection device.

[0008] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device. The staggered segmented infrared detection lens includes a central lens group, a wide-angle lens group staggered relative to the central lens group, and a junction connecting the central lens group and the wide-angle lens group. Each lens unit of the central lens group is matched to the same mounting position of a pyroelectric infrared sensor. The central axis of the staggered segmented infrared detection lens is defined by a line connecting the mounting position of the pyroelectric infrared sensor to the physical center point of the light-receiving surface of the central lens group. The direction of the line connecting the smallest focal length (f) of the lens units in the central lens group to the physical center point of the light-receiving surface of the central lens group from the mounting position is defined as the bottom direction. On the same cross-section along the central axis, the central lens group and the wide-angle lens group satisfy the following condition: the lower end of the wide-angle lens group on the same side of the central axis is lower than that of the central lens group. The outer edge of the group, and 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 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 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. This allows the staggered segmented infrared detection lens to have a staggered segmented light-gathering surface design, and in the state of the staggered segmented light-gathering surface of the staggered segmented infrared detection lens, the junction between the central lens group and the wide-angle lens group is avoided from blocking the effective light-gathering angle of either lens group. Therefore, compared with the overall convex light-gathering surface shape, the staggered segmented light-gathering surface design can take into account both the large light-gathering surface area requirement and the small volume requirement under the fixed effective light-gathering angle design.

[0009] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the light-gathering surface of the wide-angle lens group is configured to be formed by splicing multiple planes to avoid reflection / refraction of the corresponding incident infrared light, or to reduce the reflection / incident probability of the corresponding incident infrared light, thereby improving the light focusing efficiency of each lens unit of the wide-angle lens group, increasing the light intensity, and thus improving the detection accuracy of the infrared detection device.

[0010] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the light-incoming surface of the central lens group is configured to be formed by splicing multiple planes, and the wide-angle lens group is arranged around the central lens group, with its lower end connected to the outer edge of the central lens group via the junction, thus forming a structure in which the wide-angle lens group is staggered relative to the central lens group. While avoiding or reducing the impact on incident light by the planar design of the light-incoming surface of the central lens group, the staggered design of the wide-angle lens group relative to the central lens group balances the requirements of a large light-incoming surface area and a small volume, and achieves a relatively aesthetically pleasing visual experience.

[0011] Another objective of this invention is to provide a staggered segmented infrared detection lens and an infrared detection device, wherein the optical center of each lens unit of the wide-angle lens group is at a height higher than the optical center of each lens unit of the central lens group along the central axis, thereby ensuring that the volume is reduced based on the staggered design of the wide-angle lens group relative to the central lens group while also meeting the requirement of a large detection angle.

[0012] According to one aspect of the present invention, a staggered segmented infrared detection lens is provided, wherein the staggered segmented infrared detection lens comprises:

[0013] A central lens group, wherein the central lens group is a lens group formed by an array arrangement of multiple lens units;

[0014] 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

[0015] A junction is provided, wherein the junction connects the central lens group and the wide-angle lens group, wherein each lens unit of the central lens group is matched with the same mounting position of the pyroelectric infrared sensor, wherein the line connecting the mounting position of the pyroelectric infrared sensor to the physical center point of the light-receiving surface of the central lens group is the central axis of the staggered segmented infrared detection lens, and the direction of the line connecting the mounting position to the physical center point of the light-receiving surface of the central lens group is the bottom direction. 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-receiving 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 farther away from the central axis relative to the outer edge of the central lens group; and on the same side of the central axis... The upper end of the wide-angle lens group on one side is farther from the central axis than the lower end of the wide-angle lens group. With respect to 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, the focal point of the lens unit of the wide-angle lens group on that side at that cross section is located above this line. The light-gathering surface of the wide-angle lens group is configured to be formed by splicing multiple planes, with the smallest focal length among the lens units of the central lens group being f. The central lens group and the wide-angle lens group further satisfy the following on the same cross section along the central axis: 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 the central axis at a point P, where point P's height relative to the central lens group along the central axis is less than f.

[0016] In one embodiment, the optical center of each lens unit of the wide-angle lens group is at a height higher than the optical center of each lens unit of the central lens group along the central axis.

[0017] In one embodiment, the central lens group is disposed on a cross section along the central axis to further satisfy the following: the central lens group has a structural shape that is low in the middle and high at both ends, corresponding to the central lens group being recessed and having an outer edge higher than the body, and the wide-angle lens group, in the state of being disposed around the central lens group, is connected to the outer edge of the central lens group at its lower end via the junction portion.

[0018] In one embodiment, the central lens group is designed to have a light-receiving surface consisting of a bottom light-receiving surface and a plurality of lateral light-receiving surfaces disposed around and inclined to the bottom light-receiving surface.

[0019] In one embodiment, the bottom light-incoming surface and the side light-incoming surface of the central lens group are both planar, and the wide-angle lens group, when positioned around the central lens group, is connected to the outer edge of the central lens group at its lower end via the junction.

[0020] In one embodiment, the light-gathering surface of the central lens group is designed as a spherical cross-section.

[0021] In one embodiment, the light-gathering surface of the wide-angle lens group is designed to be formed by laterally splicing multiple trapezoidal light-gathering surfaces.

[0022] In one embodiment, each trapezoidal light-gathering surface of the wide-angle lens group corresponds to an upper optical center and a lower optical center.

[0023] In one embodiment, the light-gathering surface of the wide-angle lens group is designed to have a plurality of first light-gathering surfaces and a plurality of second light-gathering surfaces. The plurality of first light-gathering surfaces are laterally spliced ​​together and their lower ends are connected to the outer edge of the central lens group via the junction. The plurality of second light-gathering surfaces are laterally spliced ​​together and are spliced ​​to the upper end of the first light-gathering surface at their lower ends in a state inclined to the first light-gathering surface. The upper ends of the second light-gathering surfaces are farther away from the central axis relative to the upper ends of the first light-gathering surfaces.

[0024] In one embodiment, each lens unit of the wide-angle lens group is configured as a Fresnel lens, and each lens unit has a smooth surface and a corresponding texture design on the side opposite the smooth surface to give the lens unit light-gathering characteristics. The smooth surface of each lens unit constitutes the light-gathering surface of the wide-angle lens group.

[0025] According to another aspect of the present invention, an infrared detection device is provided, wherein the infrared detection device comprises:

[0026] The misaligned segmented infrared detection lens described above;

[0027] A housing, wherein the housing has a lens window connecting the internal space and the external space of the housing, wherein the staggered segmented infrared detection lens is mounted in the lens window with its light-incoming surface facing the external space of the housing; and

[0028] At least one pyroelectric infrared sensor is disposed in the interior space of the housing and its sensing surface faces the misaligned segmented infrared detection lens.

[0029] The further objectives and advantages of this invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structural principle of an existing infrared detection device.

[0031] Figure 2AThis is a three-dimensional structural schematic diagram of a misaligned segmented infrared detection lens according to an embodiment of the present invention.

[0032] Figure 2B This is a three-dimensional structural diagram of the misaligned segmented infrared detection lens according to the above embodiment of the present invention from another perspective.

[0033] Figure 2C This is a schematic diagram of the cross-sectional structure of the misaligned segmented infrared detection lens according to the above embodiment of the present invention.

[0034] Figure 3A This is a schematic diagram of the cross-sectional structure of the misaligned segmented infrared detection lens according to another embodiment of the present invention.

[0035] Figure 3B This is a schematic diagram of the cross-sectional structure of the misaligned segmented infrared detection lens according to another embodiment of the present invention.

[0036] Figure 4A This is a three-dimensional structural schematic diagram of the misaligned segmented infrared detection lens according to another embodiment of the present invention.

[0037] Figure 4B For the corresponding Figure 4A The diagram shows a cross-sectional structure of the misaligned segmented infrared detection lens in another embodiment.

[0038] Figure 5 This is a three-dimensional structural diagram of an infrared detection device according to an embodiment of the present invention.

[0039] Figure 6 This is a three-dimensional structural diagram of the infrared detection device according to another embodiment of the present invention, further provided with a shielding cover.

[0040] Figure 7A This is a three-dimensional structural diagram of the infrared detection device according to another embodiment of the present invention.

[0041] Figure 7B For Figure 7A The infrared detection device of this other embodiment is shown in a three-dimensional structural diagram from another perspective.

[0042] Figure 8A This is a three-dimensional structural diagram of the infrared detection device according to another embodiment of the present invention.

[0043] Figure 8B For Figure 8A The infrared detection device of this other embodiment is shown in a three-dimensional structural diagram from another perspective.

[0044] Figure 9A This is a three-dimensional structural diagram of the infrared detection device according to another embodiment of the present invention.

[0045] Figure 9B For Figure 9A The diagram shows a split structure of the infrared detection device according to another embodiment.

[0046] Figure 9C For Figure 9A The infrared detection device of this other embodiment is shown in a three-dimensional structural diagram from another perspective. Detailed Implementation

[0047] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0048] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0049] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0050] This utility model provides a staggered segmented infrared detection lens and an infrared detection device. The staggered segmented infrared detection lens, based on the staggered segmented light-receiving surface design, can balance the requirements of a large light-receiving surface area and a small volume under a fixed effective light-receiving angle design. It can also avoid the problem of reflection / refraction of incident infrared light (i.e., human infrared radiation, also known as infrared light or infrared rays) caused by the pursuit of small volume in the prior art. Therefore, it is beneficial to ensure the detection accuracy of the infrared detection device with a large light-receiving surface area design, while also taking into account the miniaturization design of the infrared detection device.

[0051] Specifically, please refer to the accompanying drawings in the specification of this utility model. Figure 2A and Figure 2B As shown, the structure of a staggered segmented infrared detection lens according to an embodiment of the present invention is illustrated. The staggered segmented infrared detection lens 10 has a central lens group 11, a wide-angle lens group 12 staggered relative to the central lens group 11, and a junction 13 connecting the central lens group 11 and the wide-angle lens group 12. Both the central lens group 11 and the wide-angle lens group 12 are lens groups formed by an array arrangement of multiple lens units 100. Each lens unit 100 of the central lens group 11 is matched to... For the same mounting position of the pyroelectric infrared sensor, the line connecting the mounting position of the pyroelectric infrared sensor to the physical center point of the light-incident surface 110 of the central lens group 11 is the central axis 111 of the staggered segmented infrared detection lens, and the direction of the line connecting the mounting position to the physical center point of the light-incident surface 110 of the central lens group 11 is the bottom direction. The central lens group 11 and the wide-angle lens group 12 satisfy the following on the same cross section along the central axis 111: the light-incident surface 120 of the wide-angle lens group 12 faces away from the central axis 111. The lower end of the wide-angle lens group 12 on the same side of the central lens group 11 is lower than the outer edge of the central lens group 11 and is farther away from the central axis 111 relative to the outer edge of the central lens group 11. The lower 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 farther away from the central axis 111 relative to the lower end of the wide-angle lens group 12. This is true for 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. The wide-angle lens group 12 on that side at that cross-section... The focal point of the lens unit 100 is located above the connecting line, so that the staggered segmented infrared detection lens 10 has a staggered segmented light-gathering surface design. In the state of the staggered segmented infrared detection lens 10's light-gathering surface being staggered, the junction 13 connecting the central lens group 11 and the wide-angle lens group 12 is prevented from blocking the effective light-gathering angle of the wide-angle lens group 12. Therefore, compared with the overall convex light-gathering surface shape, the staggered segmented light-gathering surface design can take into account both the large light-gathering surface area requirement and the small volume requirement under the design of a fixed effective light-gathering angle.

[0052] Specifically, taking the smallest focal length among the lens units 100 of the central lens group 11 as f, the central lens group 11 and the wide-angle lens group 12 preferably satisfy the following on the same cross section along the central axis 111: 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 direction of the central axis 111 is less than f. This avoids the junction 13 connecting the central lens group 11 and the wide-angle lens group 12 from blocking the effective light-gathering angle of either lens group when using a single pyroelectric infrared sensor in the corresponding infrared detection device.

[0053] Of particular note is that, in this invention, the light-gathering surface 120 of the wide-angle lens group 12 is configured to be formed by splicing multiple planes. Compared with the traditional integral arc-shaped convex Fresnel lens, this can avoid reflection / refraction of the corresponding incident infrared light, or reduce the reflection / incident probability of the corresponding incident infrared light, thereby improving the light-gathering efficiency of each lens unit 100 of the wide-angle lens group 12 and increasing the light-gathering intensity, which is beneficial to improving the detection accuracy of the corresponding infrared detection device.

[0054] In particular, in this embodiment of the present invention, the light-gathering surface 110 of the central lens group 11 is configured to be formed by splicing multiple planes, and the wide-angle lens group 12 is arranged around the central lens group 11 and connected to the outer edge of the central lens group 11 at its lower end via the junction 13. This forms a structure in which the wide-angle lens group 12 is staggered relative to the central lens group 11. While avoiding or reducing the impact on incident light by the planar design of the light-gathering surface 110 of the central lens group 11, the staggered design of the wide-angle lens group 12 relative to the central lens group 11 balances the requirements of a large light-gathering surface area and a small volume, and obtains a relatively aesthetically pleasing visual experience.

[0055] It is worth mentioning that the central lens group 11 is arranged on the cross section along the central axis 111 to further satisfy the following: the central lens group 11 has a structural shape that is low in the middle and high at both ends. Corresponding to the recessed design of the central lens group 11, it has an outer edge higher than the body. The wide-angle lens group 12 is arranged around the central lens group 11 and 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. This forms a structural shape in which the wide-angle lens group 12 is staggered relative to the central lens group 11. Based on the recessed design of the central lens group 11 and the staggered design of the wide-angle lens group 12 relative to the central lens group 11, the structural strength of the staggered segmented infrared detection lens 10 is ensured while taking into account the requirements of large light-gathering surface area and small volume, and it is conducive to obtaining a relatively aesthetic visual experience.

[0056] Specifically, in this embodiment of the present invention, corresponding to the central lens group 11 having a structural shape with a low middle and high ends in the cross section along the central axis 111, the central lens group 11 is specifically designed to have a light-receiving surface 110 composed of a bottom light-receiving surface 1101 and a plurality of lateral light-receiving surfaces 1102 disposed around the bottom light-receiving surface 1101 and inclined to the bottom light-receiving surface 1101. Furthermore, in this embodiment of the present invention, both the bottom light-receiving surface 1101 and the lateral light-receiving surfaces 1102 of the central lens group 11 are planar.

[0057] It is understood that, corresponding to the central lens group 11 having a structural shape with a low middle and high ends in cross-section along the central axis 111, the shape of the light-gathering surface 110 of the central lens group 11 is diverse, and this utility model does not limit it. For example, in the state where the bottom light-gathering surface 1101 of the central lens group 11 is planar, each of the lateral light-gathering surfaces 1102 can also be designed as an arc surface, or as an entire annular inclined surface tilted to the bottom light-gathering surface 1101. As another example, the light-gathering surface 110 of the central lens group 11 corresponds to... Figures 3A to 4B In the embodiments shown, the entire surface is designed as a spherical cross-section.

[0058] It is worth mentioning that, in some embodiments of the present invention, the light-gathering surface 110 of the central lens group 11 is designed to be formed by lateral splicing of multiple inverted triangular planes, corresponding to the central lens group 11 having a structure that is low in the middle and high at both ends in the cross section along the central axis 111.

[0059] Furthermore, in the corresponding Figures 2A to 3BIn the embodiments shown, the light-gathering surface 120 of the wide-angle lens group 12 is designed to be formed by laterally splicing multiple trapezoidal light-gathering surfaces. It can be understood that each lens unit 100 of the wide-angle lens group 12 is configured as a Fresnel lens, each lens unit 100 has a smooth surface and a corresponding texture design on the side opposite the smooth surface to give the lens unit 100 light-gathering characteristics. The smooth surface of each lens unit 100 constitutes the light-gathering surface 120 of the wide-angle lens group 12, wherein each trapezoidal light-gathering surface may optionally correspond to the smooth surface of one or more lens units 100.

[0060] It is understood that the lens unit 100 is a lens with light-gathering characteristics; for example, the lens unit 100 may be... Figure 3B The convex lens shape shown in the central lens group 11 can also be a Fresnel lens, or it can be a lens with light-gathering characteristics formed by further designing a corresponding texture based on the structure of a convex lens and a Fresnel lens. Furthermore, the focal length and structure of each lens unit 100 are not limited to the same.

[0061] In particular, in the corresponding Figures 2A to 3B In the embodiments shown, each trapezoidal light-gathering surface of the wide-angle lens group 12 can be designed to correspond to an upper optical center and a lower optical center, which corresponds to the state where the trapezoidal light-gathering surface corresponds to the smooth surface of a lens unit 100, the lens unit 100 having upper and lower windows, or corresponding to the trapezoidal light-gathering surface corresponding to the smooth surfaces of the upper and lower lens units 100.

[0062] It is worth mentioning that the optical center of each lens unit 100 of the wide-angle lens group 12 is higher than the optical center of each lens unit 100 of the central lens group 11 along the central axis 111. This ensures that the requirement for a large detection angle is met while reducing the volume based on the staggered design of the wide-angle lens group 12 relative to the central lens group 11.

[0063] It is understood that the light-gathering surface 120 of the wide-angle lens group 12 can have various shapes, and this utility model does not limit it. For example, corresponding to Figure 4A and Figure 4BIn the illustrated embodiment, the light-gathering surface 120 of the wide-angle lens group 12 is designed with upper and lower segments. Specifically, the light-gathering surface 120 of the wide-angle lens group 12 is designed to have multiple first light-gathering surfaces 1201 and multiple second light-gathering surfaces 1202. The multiple first light-gathering surfaces 1201 are laterally spliced ​​together, and their lower ends are connected to the outer edge of the central lens group 11 via the junction 13. The multiple second light-gathering surfaces 1202 are laterally spliced ​​together and are spliced ​​to the upper end of the first light-gathering surface 1201 at their lower ends in a state inclined to the first light-gathering surface 1201. The upper ends of the second light-gathering surfaces 1202 are opposite to the first light-gathering surface 1201. The upper end of the light-incident surface 1201 is inclined away from the central axis 111. The first light-incident surface 1201 and the second light-incident surface 1202 are arranged on a cross section along the central axis 111 to further satisfy the following: the angle between the first light-incident surface 1201 and the vertical line connecting the lower end of the first light-incident surface 1201 and the central axis 111 is smaller than the angle between the second light-incident surface 1202 and the vertical line connecting the lower end of the second light-incident surface 1202 and the central axis 111, that is, the second light-incident surface 1202 has a more inclined angle than the first light-incident surface 1201.

[0064] Specifically, in the corresponding aspect of this utility model Figures 2A to 2C In this embodiment, the central lens group 11 and the wide-angle lens group 12 further satisfy the following 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-incident surface 110 of the central lens group 11 within a height error range of 3mm. This ensures the detection accuracy of the infrared detection device in the wide-angle direction while guaranteeing the area of ​​the light-incident surface 120 of the wide-angle lens group 12. Compared with the overall convex light-incident surface shape, the size of the staggered segmented infrared detection lens 10 is further compressed in the convex direction, which is beneficial to reduce the volume of the staggered segmented infrared detection lens 10 and obtain a relatively aesthetically pleasing visual experience.

[0065] Furthermore, it is worth mentioning that for traditional Fresnel lenses with an overall convex light-gathering surface design, on the one hand, the overall convex design with a large light-gathering surface area affects the aesthetics of the infrared detection device; on the other hand, the overall convex design with a large light-gathering surface area makes the Fresnel lens more prone to dust accumulation and aging due to sun exposure in outdoor environments. Consequently, the light loss of the Fresnel lens increases with the length of time it is used, thus reducing the accuracy of the corresponding infrared detection device. In addition, the overall convex design with a large light-gathering surface area also makes the Fresnel lens more susceptible to lateral wind and rain interference and hot and cold air convection interference, affecting the working stability of the corresponding infrared detection device.

[0066] The staggered segmented infrared detection lens 10 of this utility model is based on a staggered segmented light-gathering surface design. Compared with the overall convex light-gathering surface shape, it has a relatively compressed size in the convex direction. Therefore, when it is assembled into the infrared detection device, it can reduce the probability of interference from wind and rain and hot and cold air convection, and at the same time reduce the amount of dust and the area exposed to sunlight, thereby ensuring the working stability of the infrared detection device and extending the service life of the infrared detection device.

[0067] Furthermore, while traditional Fresnel lenses with an overall convex light-gathering surface can achieve resistance to wind, rain, and hot / cold air convection interference, and simultaneously reduce dust accumulation and solar radiation area, their larger convex dimensions in the outward direction, coupled with the need for the infrared detection device's housing to avoid obstructing the lens's light-gathering angle, necessitate a larger housing diameter for the infrared detection device when mounted recessed within it.

[0068] In other words, the staggered segmented infrared detection lens 10 of this utility model is based on a staggered segmented light-gathering surface design. Compared with the overall convex light-gathering surface, it has a relatively compressed size in the convex direction. Therefore, compared with the overall convex light-gathering surface, the infrared detection device has a smaller housing diameter requirement based on the recessed installation requirement. Thus, the relatively convex light-gathering surface shape is conducive to the recessed installation of the staggered segmented infrared detection lens 10 in the infrared detection device. Correspondingly, while taking into account the miniaturization design of the infrared detection device, it is also conducive to obtaining a relatively aesthetically pleasing visual experience.

[0069] Specifically, please refer to the accompanying drawings in the specification of this utility model. Figure 5As shown, based on the recessed installation requirement of the staggered segmented infrared detection lens 10 in the infrared detection device, an infrared detection device according to an embodiment of the present invention is illustrated. The infrared detection device includes the staggered segmented infrared detection lens 10, a housing 20, and at least one pyroelectric infrared sensor. The housing 20 has a lens window 201 connecting the internal and external spaces of the housing 20. The staggered segmented infrared detection lens 10 is installed in the lens window 201 with its light-incoming surface facing the external space of the housing 20. The pyroelectric infrared sensor is disposed in the internal space of the housing 20 with its sensing surface facing the staggered segmented infrared detection lens 10. The direction of the line connecting the mounting position to the physical center point of the light-incoming surface 110 of the central lens group 11 is the bottom direction. The window edge of the lens window 201 has a structure design that is higher on the inside and lower on the outside, thus forming a recessed installation of the staggered segmented infrared detection lens 10 in the housing 20.

[0070] It is understandable that the structural design of the window sill of the lens window 201 should avoid obstructing the light-gathering angle of the staggered segmented infrared detection lens 10. Correspondingly, the window sill of the lens window 201 is designed with a higher inner and lower outer structure based on the recessed installation requirement of the staggered segmented infrared detection lens 10. Also based on the recessed installation requirement, Fresnel lenses with an overall convex light-gathering surface have a larger diameter requirement for the window sill of the lens window 201 due to their greater recessed depth requirement. Therefore, the staggered segmented infrared detection lens 10 of this invention, based on a staggered segmented light-gathering surface design, has a smaller housing diameter requirement for the infrared detection device compared to an overall convex light-gathering surface. Thus, the relatively convex light-gathering surface shape facilitates the recessed installation of the staggered segmented infrared detection lens 10 within the infrared detection device, corresponding to a more aesthetically pleasing visual experience while maintaining the miniaturization of the infrared detection device.

[0071] Preferably, when the staggered segmented infrared detection lens 10 is recessed and installed in the housing 20, the direction of the line connecting the installation position to the physical center point of the light-incoming surface 110 of the central lens group 11 is the bottom direction. When the central lens group 11 is recessed, the outer end of the window edge of the lens window 201, which has an inner high and outer low structure design, is flush with the lowest point of the light-incoming surface 110 of the central lens group 11 within a height error range of 5mm. This helps to reduce the size of the infrared detection device and obtain a relatively aesthetically pleasing visual experience.

[0072] Furthermore, referring to the accompanying drawings in the specification of this utility model... Figure 6As shown, the infrared detection device may optionally be further provided with a shielding cover 40, which is located below the lens window 201 and has an opening 401. The shape of the opening 401 is designed to form a partitioned shielding of the light-gathering angle of the staggered segmented infrared detection lens 10. This corresponds to the state in which the staggered segmented infrared detection lens 10 can simultaneously cover the near area (small angle direction) and the far area (wide angle direction) based on the aforementioned structural design of the central lens group 11 and the wide-angle lens group 12. The shape of the opening 401 enables partitioned detection of the sensing area corresponding to the corresponding lens unit 100 exposed to the opening 401.

[0073] Specifically, the cover 40 includes a plurality of bottom-facing cover plates 41 and side-facing cover plates 42. The bottom-facing cover plates 41 are arranged around the opening 401 and sequentially connected to form an annular cover plate. The side-facing cover plates 42 are sequentially connected around the annular cover plate in a state connected to the outer edge of the annular cover plate to form an annular cover wall. Corresponding to the state where the cover 40 has the annular cover plate as its base, the annular cover wall is a sidewall extending laterally from the outer edge of the annular cover plate. The connection areas between the connected bottom-facing cover plates 41, between the annular cover plate and the annular cover wall, between the connected side-facing cover plates 42, and between the annular cover wall and the cover 40 are preset fracture areas. The preset fracture areas are connection structures that achieve controllable fracture through local thinning and / or perforation. This allows for adjustment of the blocking angle of the opaque segmented infrared detection lens 10 by the blocking cover 40 by peeling the corresponding bottom blocking sheet 41 and / or the side blocking sheet 42 from the blocking cover 40, thereby meeting different detection area distribution requirements.

[0074] It is worth mentioning that, in addition to being set according to the natural color of the lens main material, in some embodiments of this utility model, 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 housing 20. For example, when the housing 20 is set to white, the segmented infrared detection lens 10 is preferably white by incorporating relevant color powder / pigment into the lens main material. In this way, the aesthetics and concealment of the infrared detection device are enhanced by the feature that the staggered segmented infrared detection lens 10 is the same color as the housing 20.

[0075] Furthermore, when the infrared detection device is equipped with the shielding cover 40, the shielding cover 40 is preferably the same color as the misaligned segmented infrared detection lens 10. For example, when the segmented infrared detection lens 10 is white, the shielding cover 40 is preferably made of white material and the shielding cover 40 is protected from infrared light by at least one of the following methods: thickening the shielding cover, selecting a specific material, and coating / attaching a light-blocking film.

[0076] It is worth mentioning that, in specific implementation, the infrared detection device can be implemented in different specific forms, as shown in the reference. Figures 7A to 9C As shown, the infrared detection device according to some embodiments of the present invention is illustrated, wherein corresponding to Figure 7A and Figure 7B and Figure 8A and Figure 8B In the two embodiments shown, the infrared detection device is implemented in a structural form suitable for embedded installation in the corresponding ceiling or mounting plate.

[0077] In particular, unlike the structure of traditional infrared detection devices, it corresponds to... Figures 9A to 9C In the illustrated embodiment, the housing 20 is designed in the form of a switch panel, and preferably is designed with standard switch panel dimensions to accommodate installation in standard junction boxes, such as type 86, type 118, and type 120 junction boxes. Furthermore, the recessed installation of the staggered segmented infrared detection lens 10 based on this invention within the housing 20 prevents the staggered segmented infrared detection lens 10 from protruding from the panel, thus facilitating a relatively aesthetically pleasing visual experience when the infrared detection device is installed.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A staggered 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 multiple 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 is provided, wherein the junction connects the central lens group and the wide-angle lens group, wherein each lens unit of the central lens group is matched to the same mounting position of the pyroelectric infrared sensor, wherein the line connecting the mounting position to the physical center point of the light-incident surface of the central lens group is the central axis of the staggered segmented infrared detection lens, and the direction along the mounting position to the line connecting the physical center point of the light-incident surface of the central lens group is the bottom direction. 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-incident 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 farther away from the central axis relative to the outer edge of the central lens group; and on the same side of the central axis... The upper end of the wide-angle lens group is farther from the central axis than the lower end of the wide-angle lens group. With respect to the line connecting the lower end of the wide-angle lens group to the outer edge of the central lens group on the same side of the central axis, the focal point of the lens unit of the wide-angle lens group on that side of the cross section is located above this line. The light-gathering surface of the wide-angle lens group is configured to be formed by splicing multiple planes, with the smallest focal length among the lens units of the central lens group being f. The central lens group and the wide-angle lens group further satisfy the following on the same cross section along the central axis: the line connecting the lower end of the wide-angle lens group to the outer edge of the central lens group on the same side of the central axis intersects the central axis at a point P, where point P's height relative to the central lens group along the central axis is less than f.

2. The staggered segmented infrared detection lens according to claim 1, wherein the optical center of each lens unit of the wide-angle lens group is at a height higher than the optical center of each lens unit of the central lens group along the central axis.

3. The staggered segmented infrared detection lens according to claim 2, wherein the central lens group is disposed on a cross section along the central axis and further satisfies: the central lens group has a structural shape that is low in the middle and high at both ends, corresponding to the central lens group being recessed and having an outer edge higher than the body, and the wide-angle lens group, in the state of being disposed around the central lens group, is connected to the outer edge of the central lens group at its lower end via the junction portion.

4. The staggered segmented infrared detection lens according to claim 3, wherein the central lens group is designed to have a light-receiving surface composed of a bottom light-receiving surface and a plurality of lateral light-receiving surfaces disposed around the bottom light-receiving surface and inclined to the bottom light-receiving surface.

5. The staggered segmented infrared detection lens according to claim 4, wherein the bottom light-incoming surface and the side light-incoming surface of the central lens group are both planar, and the wide-angle lens group, when arranged around the central lens group, is connected to the outer edge of the central lens group at its lower end via the junction portion.

6. The staggered segmented infrared detection lens according to claim 2, wherein the light-gathering surface of the central lens group is designed as a spherical cross-section.

7. The staggered segmented infrared detection lens according to claim 2, wherein the light-gathering surface of the wide-angle lens group is designed to be formed by lateral splicing of multiple trapezoidal light-gathering surfaces.

8. The misaligned segmented infrared detection lens according to claim 7, wherein each trapezoidal light-gathering surface of the wide-angle lens group corresponds to an upper optical center and a lower optical center.

9. The staggered segmented infrared detection lens according to claim 2, wherein the light-gathering surface of the wide-angle lens group is designed to have a plurality of first light-gathering surfaces and a plurality of second light-gathering surfaces, the plurality of first light-gathering surfaces are laterally spliced ​​together and their lower ends are connected to the outer edge of the central lens group via the junction portion, the plurality of second light-gathering surfaces are laterally spliced ​​together and spliced ​​to the upper end of the first light-gathering surface at their lower ends in an inclined state relative to the first light-gathering surface, wherein the upper end of the second light-gathering surface is farther away from the central axis than the upper end of the first light-gathering surface.

10. The misaligned segmented infrared detection lens according to any one of claims 7 to 9, wherein each lens unit of the wide-angle lens group is configured as a Fresnel lens, each lens unit having a smooth surface and having a light-gathering characteristic on the side opposite to the smooth surface based on a corresponding texture design, wherein the smooth surface of each lens unit constitutes the light-gathering surface of the wide-angle lens group.

11. An infrared detection device, characterized in that, include: The misaligned segmented infrared detection lens according to any one of claims 1 to 10; A housing, wherein the housing has a lens window connecting the internal space and the external space of the housing, wherein the staggered segmented infrared detection lens is installed in the lens window with its light-incoming surface facing the external space of the housing; as well as At least one pyroelectric infrared sensor is disposed in the interior space of the housing and its sensing surface faces the misaligned segmented infrared detection lens.

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