Fresnel arc-shaped lens

Abstract

The utility model discloses a Fresnel arc-shaped lens, which belongs to the technical field of Fresnel lenses and comprises a lens main body, the cross section of the lens main body is of a U-shaped structure, lens grain layers are arranged in arc transition areas on two sides of the lens main body, and a plane area is arranged in the middle of the lens main body. The lens grain layer of the four-layer structure on the two sides is composed of 22 pieces of Fresnel grains in parallel. The lens grain layers formed by combining the 22 Fresnel grains are arranged in the arc transition areas on the two sides of the lens main body, and the two sides of the four-layer lens grain layer are symmetrically arranged, so that the lens is particularly sensitive to the transverse direction of an object. According to the utility model, the lens with radian is adopted to better meet the detection requirements of large angle and distance, the lens can be hung at the height of 2.5 m, the detection angle can reach more than 180 degrees when two sensors are matched and used within the limited range of the lens, and the detection range can reach 12 m away from the front; the appearance is attractive and the assembly is convenient; the method is especially suitable for the application situation that the intelligent camera IP Camera is matched with the lamp.

Description

Technical Field

[0001] The utility model belongs to the technical field of Fresnel lenses, and particularly relates to a Fresnel arc lens. Background Art

[0002] The Fresnel lens uses the focusing optical principle of the lens to generate an alternating "blind area" and "high-sensitivity area" absorption light area in front of the detector to improve its detection and reception sensitivity. When someone walks in front of the lens, the infrared rays emitted by the human body continuously alternate from the "blind area" into the "high-sensitivity area", so that the received infrared signal is input in the form of a pulse with strong and weak fluctuations, thereby enhancing its energy amplitude. The Fresnel lens is equivalent to a convex lens for infrared light and visible light, with good effects, but much lower cost than ordinary convex lenses and is conducive to production and manufacturing. It is mostly used in occasions where the accuracy requirement is not very high, such as slide projectors, film magnifiers, infrared detectors, etc.

[0003] The detection range of the existing lens is small, the detection distance is short, and it cannot quickly capture the lateral movement of the object. Therefore, it is necessary to develop a new type of lens to meet the application requirements. Content of the Utility Model

[0004] In order to solve the above problems, the utility model provides a Fresnel arc lens.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A Fresnel arc lens includes a lens body. The cross-section of the lens body is a U-shaped structure. Lens texture layers are provided in the arc transition areas on both sides of the lens body, and a flat area is provided between the two lens texture layers on both sides; the lens texture layer is a four-layer structure, and both lens texture layers on both sides are composed of 22 Fresnel textures arranged in parallel, and both lens texture layers on both sides are symmetrically distributed along the vertical axis of the lens body.

[0007] Preferably, convex eaves bent inward are provided at the upper and lower edges of the lens body, and the upper and lower convex eaves are arranged in parallel; a plurality of mounting holes are provided at intervals along the length direction of the convex eaves; the lens texture layer is provided in the arc transition areas on both sides of the back of the lens body, and notches are provided at the convex eaves corresponding to both ends of the flat area.

[0008] Preferably, the lens body and the convex eaves are integrally formed.

[0009] Preferably, the detection angle of the lens texture layer is 180 degrees, and the detection distance is 12 meters.

[0010] Preferably, the thickness of the lens body is 0.5 - 0.8 mm.

[0011] Preferably, the 22 Fresnel patterns are divided into three groups of concentrator areas from the outside to the inside, namely the outer concentrator area, the middle concentrator area, and the inner concentrator area. The middle concentrator area consists of four rows and four columns of concentrator areas from the outside to the inside and from top to bottom. The outer concentrator area and the inner concentrator area are both single-column and three-row concentrator areas from top to bottom. The area of the first row of the outer concentrator area and the inner concentrator area is larger than that of the third row of the concentrator area, and the area of the third row of the concentrator area is larger than that of the second row of the concentrator area. The area of the first row of the outer concentrator area and the inner concentrator area is larger than that of the first row of the middle concentrator area, and the areas of the second and third rows of the outer concentrator area and the inner concentrator area are larger than those of the three rows and three columns of each concentrator area in the lower part of the middle concentrator area.

[0012] Preferably, the first row of the three groups of concentrator areas from the outside to the inside are the first concentrator area, the second concentrator area, the third concentrator area, the fourth concentrator area, the fifth concentrator area, and the sixth concentrator area in sequence;

[0013] The following two rows of the outer concentrator area are the seventh concentrator area and the thirteenth concentrator area in sequence; the following two rows of the inner concentrator area are the twelfth concentrator area and the eighteenth concentrator area in sequence;

[0014] The second row from the bottom of the middle concentrator area from the outside to the inside are the eighth concentrator area, the ninth concentrator area, the tenth concentrator area, and the eleventh concentrator area in sequence; the third row from the bottom of the middle concentrator area from the outside to the inside are the fourteenth concentrator area, the fifteenth concentrator area, the sixteenth concentrator area, and the seventeenth concentrator area in sequence; the fourth row from the bottom of the middle concentrator area from the outside to the inside are the nineteenth concentrator area, the twentieth concentrator area, the twenty-first concentrator area, and the twenty-second concentrator area in sequence.

[0015] Preferably, the width of the first concentrator area is 10.4 ± 0.5 mm and the height is 15.79 ± 0.5 mm; the width of the second concentrator area is 5 ± 0.5 mm and the height is 14.79 ± 0.5 mm; the width of the third concentrator area is 3.5 ± 0.5 mm and the height is 14.79 ± 0.5 mm; the width of the fourth concentrator area is 4.25 ± 0.5 mm and the height is 14.79 ± 0.5 mm; the width of the fifth concentrator area is 4.75 ± 0.5 mm and the height is 14.79 ± 0.5 mm; the width of the sixth concentrator area is 10.05 ± 0.5 mm and the height is 15.79 ± 0.5 mm;

[0016] The width of the seventh light - condensing area is 10.4 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the eighth light - condensing area is 5 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the ninth light - condensing area is 3.5 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the tenth light - condensing area is 4.25 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the eleventh light - condensing area is 4.75 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the twelfth light - condensing area is 10.05 ± 0.5 mm, and the height is 4 ± 0.5 mm;

[0017] The width of the thirteenth light - condensing area is 10.4 ± 0.5 mm, and the height is 8.61 ± 0.5 mm; the width of the fourteenth light - condensing area is 5 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the fifteenth light - condensing area is 3.5 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the sixteenth light - condensing area is 4.25 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the seventeenth light - condensing area is 4.75 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the eighteenth light - condensing area is 10.05 ± 0.5 mm, and the height is 8.61 ± 0.5 mm;

[0018] The width of the nineteenth light - condensing area is 5 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twentieth light - condensing area is 3.5 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twenty - first light - condensing area is 4.25 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twenty - second light - condensing area is 4.75 ± 0.5 mm, and the height is 5.11 ± 0.5 mm.

[0019] Compared with the prior art, the technical progress achieved by the present utility model lies in:

[0020] By providing a lens pattern layer composed of 22 Fresnel patterns on both arc - transition areas of the lens body, the present utility model arranges the lens pattern layer with a four - layer design symmetrically on both sides, which is particularly sensitive to the horizontal direction of an object. The lens with a curvature in the present utility model better meets the detection requirements for large angles and distances. It can be suspended at a height of 2.5 meters. When used in combination with 2 sensors within the limited range of the lens, the detection angle can reach more than 180 degrees, and the detection range can reach 12 meters in front, without a blind area exceeding 1.5 meters. At the same time, it has an attractive appearance and is convenient for assembly. The present utility model is particularly suitable for the application scenario of an intelligent camera IP Camera cooperating with a lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model.

[0022] In the drawings:

[0023] Figure 1 It is a schematic structural diagram of a Fresnel arc lens provided by an embodiment of the present utility model;

[0024] Figure 2 It is an external view of the Fresnel arc lens in an embodiment of the present utility model;

[0025] Figure 3 is Figure 1 the front view of the Fresnel arc lens in;

[0026] Figure 4 is Figure 3 the developed view of the lens texture layer in.

[0027] In the figure:

[0028] 100 - lens main body, 101 - lens texture layer, 102 - convex eaves, 103 - mounting hole, 104 - notch, 105 - flat area;

[0029] 1 - first light - condensing area, 2 - second light - condensing area, 3 - third light - condensing area, 4 - fourth light - condensing area, 5 - fifth light - condensing area, 6 - sixth light - condensing area, 7 - seventh light - condensing area, 8 - eighth light - condensing area, 9 - ninth light - condensing area, 10 - tenth light - condensing area, 11 - eleventh light - condensing area, 12 - twelfth light - condensing area, 13 - thirteenth light - condensing area, 14 - fourteenth light - condensing area, 15 - fifteenth light - condensing area, 16 - sixteenth light - condensing area, 17 - seventeenth light - condensing area, 18 - eighteenth light - condensing area, 19 - nineteenth light - condensing area, 20 - twentieth light - condensing area, 21 - twenty - first light - condensing area, 22 - twenty - second light - condensing area. Specific embodiments

[0030] The following specific embodiments can be combined with each other. For the same or similar concepts or processes, they may not be repeated in some embodiments. The embodiments of the present utility model will be described below with reference to the drawings.

[0031] Such as Figure 1 、 Figure 2 and Figure 3As shown, a Fresnel arc lens includes a lens body 100. The cross-section of the lens body 100 is a U-shaped structure. Lens texture layers 101 are provided in the arc transition areas on both sides of the lens 100, and a flat area 105 is provided between the two lens texture layers 101. The lens texture layer 101 is a four-layer structure. Both of the two lens texture layers 101 are composed of 22 Fresnel textures arranged in parallel, and the two lens texture layers 101 are symmetrically distributed along the vertical axis of the lens body 100. The detection angle of the lens texture layer 101 is 180 degrees, and the detection distance is 12 meters. By symmetrically arranging the lens texture layers in the arc transition areas on both sides of the lens body, there is more space for the textures, and the energy at large angles can be absorbed. Even if there is a flat area in the middle, the detection range can be perfectly covered without a blind area exceeding 1.5 meters. The four-layer designed lens texture layer is particularly sensitive to the lateral direction of an object. This Fresnel arc lens can be suspended at a height of 2.5 meters. When used in combination with 2 sensors within the limited range of the lens, the detection angle can reach more than 180 degrees, and the detection range can reach 12 meters in front.

[0032] As a preferred structure, as Figure 1 、 2 shown, eaves 102 that are bent inward are provided at the upper and lower edges of the lens body 100, and the upper and lower eaves 102 are arranged in parallel. A plurality of mounting holes 103 are provided at intervals along the length direction of the eaves 102. The lens texture layer 101 is provided in the arc transition areas on both sides of the back of the lens body 100, and notches 104 are provided at the eaves 102 corresponding to both ends of the flat area 105. During assembly, the mounting holes and notches are used to conveniently snap and fix the lens to the mounting position of the product, facilitating assembly. During specific manufacturing, there is a certain distance between the edge of the lens body and the eaves to ensure a beautiful appearance after the lens is installed on the product.

[0033] During specific manufacturing, the lens body 400 and the eaves 102 are integrally formed, with a simple manufacturing process and suitable for mass production. At the same time, the thickness of the lens body 100 is designed to be 0.5 - 0.8 mm, which is small and light. At the same time, the outer surface can be a black shiny surface, and the three-dimensional U-shaped structure has a beautiful and generous appearance, and can perfectly fit with the product.

[0034] In a specific embodiment of the present invention, as Figure 4As shown in the figure, the 22 Fresnel patterns are divided into three groups of light-concentrating areas from the outside to the inside, namely the outer light-concentrating area, the middle light-concentrating area, and the inner light-concentrating area. The middle light-concentrating area consists of four rows and four columns of light-concentrating areas from the outside to the inside and from top to bottom. The outer light-concentrating area and the inner light-concentrating area are both single-column and three-row light-concentrating areas from top to bottom. The area of the first row of the outer light-concentrating area and the inner light-concentrating area is larger than that of the third row of the light-concentrating area, and the area of the third row of the light-concentrating area is larger than that of the second row of the light-concentrating area. The area of the first row of the outer light-concentrating area and the inner light-concentrating area is larger than the area of the first row of the middle light-concentrating area, and the areas of the second and third rows of the outer light-concentrating area and the inner light-concentrating area are larger than the areas of each of the three rows and three columns in the lower part of the middle light-concentrating area. Among them, the Fresnel pattern can only be seen from the back of the lens and cannot be seen from the front, making the appearance more beautiful.

[0035] As Figure 3 , 4 shown, the first rows of the three groups of light-concentrating areas are, from the outside to the inside, the first light-concentrating area 1, the second light-concentrating area 2, the third light-concentrating area 3, the fourth light-concentrating area 4, the fifth light-concentrating area 5, and the sixth light-concentrating area 6. The lower two rows of the outer light-concentrating area are, in sequence, the seventh light-concentrating area 7 and the thirteenth light-concentrating area 13. The lower two rows of the inner light-concentrating area are, in sequence, the twelfth light-concentrating area 12 and the eighteenth light-concentrating area 18. The second row from the bottom of the middle light-concentrating area is, from the outside to the inside, the eighth light-concentrating area 8, the ninth light-concentrating area 9, the tenth light-concentrating area 10, and the eleventh light-concentrating area 11. The third row from the bottom of the middle light-concentrating area is, from the outside to the inside, the fourteenth light-concentrating area 14, the fifteenth light-concentrating area 15, the sixteenth light-concentrating area 16, and the seventeenth light-concentrating area 17. The fourth row from the bottom of the middle light-concentrating area is, from the outside to the inside, the nineteenth light-concentrating area 19, the twentieth light-concentrating area 20, the twenty-first light-concentrating area 21, and the twenty-second light-concentrating area 22.

[0036] In the specific design, the width of the first light-concentrating area 1 is 10.4 ± 0.5 mm, and the height is 15.79 ± 0.5 mm; the width of the second light-concentrating area 2 is 5 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the third light-concentrating area 3 is 3.5 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the fourth light-concentrating area 4 is 4.25 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the fifth light-concentrating area 5 is 4.75 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the sixth light-concentrating area 6 is 10.05 ± 0.5 mm, and the height is 15.79 ± 0.5 mm;

[0037] The width of the seventh light condensing area 7 is 10.4 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the eighth light condensing area 8 is 5 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the ninth light condensing area 9 is 3.5 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the tenth light condensing area 10 is 4.25 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the eleventh light condensing area 11 is 4.75 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the twelfth light condensing area 12 is 10.05 ± 0.5 mm, and the height is 4 ± 0.5 mm;

[0038] The width of the thirteenth light condensing area 13 is 10.4 ± 0.5 mm, and the height is 8.61 ± 0.5 mm; the width of the fourteenth light condensing area 14 is 5 ± 0.5 mm, and the height is 4.5 ± 0.5 mm, the width of the fifteenth light condensing area 15 is 3.5 ± 0.5 mm, and the height is 4.5 ± 0.5 mm, the width of the sixteenth light condensing area 16 is 4.25 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the seventeenth light condensing area 17 is 4.75 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the eighteenth light condensing area 18 is 10.05 ± 0.5 mm, and the height is 8.61 ± 0.5 mm;

[0039] The width of the nineteenth light condensing area 19 is 5 ± 0.5 mm, and the height is 5.11 ± 0.5 mm, the width of the twentieth light condensing area 20 is 3.5 ± 0.5 mm, and the height is 5.11 ± 0.5 mm, the width of the twenty - first light condensing area 21 is 4.25 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twenty - second light condensing area 22 is 4.75 ± 0.5 mm, and the height is 5.11 ± 0.5 mm.

[0040] The utility model has the advantages of simple structure, wide detection angle and long distance. By arranging lens texture layers respectively composed of 22 Fresnel textures on the arc transition areas on both sides of the lens body, the four - layer designed lens texture layers are symmetrically arranged on both sides and can be matched with two sensors to meet different application requirements. The lens can be suspended at a height of 2.5 meters, is particularly sensitive to the horizontal direction of an object, and the lens with an arc is more in line with the detection requirements of large angles and distances. The detection angle of using 2 sensors within the limited range of the lens reaches more than 180 degrees, and the detection range can reach 12 meters in front; at the same time, the Fresnel texture cannot be seen on the outer surface, making the appearance more beautiful; with the help of the eaves on the upper and lower edges, it is more convenient for assembly. The utility model is particularly suitable for the application scenario of an intelligent camera IP Camera cooperating with a lamp.

[0041] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A Fresnel arc lens, characterized in that: It includes a lens body. The cross-section of the lens body is a U-shaped structure. Lens texture layers are provided in the arc transition areas on both sides of the lens body, and a flat area is provided between the two lens texture layers on both sides. The lens texture layer is a four-layer structure. The lens texture layers on both sides are each composed of 22 Fresnel textures arranged in parallel, and the lens texture layers on both sides are symmetrically distributed along the vertical axis of the lens body.

2. The Fresnel arc lens according to claim 1, wherein: Convex eaves that bend inward are provided at the upper and lower edges of the lens body, and the upper and lower convex eaves are arranged in parallel. A plurality of mounting holes are provided at intervals along the length direction of the convex eaves. The lens texture layer is provided in the arc transition areas on both sides of the back of the lens body, and notches are provided at the convex eaves corresponding to both ends of the flat area.

3. The Fresnel arc lens according to claim 2, wherein: The lens body and the convex eaves are integrally formed.

4. A Fresnel arc lens according to claim 2, characterized in that: The detection angle of the lens texture layer is 180 degrees, and the detection distance is 12 meters.

5. The Fresnel arc lens according to claim 2, wherein: The thickness of the lens body is 0.5 - 0.8 mm.

6. A Fresnel arc lens according to claim 1, wherein: The 22 Fresnel textures are divided into three groups of light-concentrating areas from the outside to the inside, namely the outer light-concentrating area, the middle light-concentrating area, and the inner light-concentrating area. The middle light-concentrating area is a four-row and four-column light-concentrating area from the outside to the inside and from top to bottom. The outer light-concentrating area and the inner light-concentrating area are both single-column and three-row light-concentrating areas from top to bottom. The area of the first row of the outer light-concentrating area and the inner light-concentrating area is larger than the area of the third row of the light-concentrating area, and the area of the third row of the light-concentrating area is larger than the area of the second row of the light-concentrating area. The area of the first row of the outer light-concentrating area and the inner light-concentrating area is larger than the area of the first row of the light-concentrating area in the middle light-concentrating area, and the areas of the second and third rows of the outer light-concentrating area and the inner light-concentrating area are larger than the areas of each of the three rows and three columns in the lower part of the middle light-concentrating area.

7. A Fresnel arc lens according to claim 6, characterized in that: The first row of the three groups of light-concentrating areas is, from the outside to the inside, the first light-concentrating area, the second light-concentrating area, the third light-concentrating area, the fourth light-concentrating area, the fifth light-concentrating area, and the sixth light-concentrating area. The lower two rows of the outer light-concentrating area are, in sequence, the seventh light-concentrating area and the thirteenth light-concentrating area; the lower two rows of the inner light-concentrating area are, in sequence, the twelfth light-concentrating area and the eighteenth light-concentrating area. The second row from the bottom of the middle light-concentrating area is, from the outside to the inside, the eighth light-concentrating area, the ninth light-concentrating area, the tenth light-concentrating area, and the eleventh light-concentrating area; the third row from the bottom of the middle light-concentrating area is, from the outside to the inside, the fourteenth light-concentrating area, the fifteenth light-concentrating area, the sixteenth light-concentrating area, and the seventeenth light-concentrating area; the fourth row from the bottom of the middle light-concentrating area is, from the outside to the inside, the nineteenth light-concentrating area, the twentieth light-concentrating area, the twenty-first light-concentrating area, and the twenty-second light-concentrating area.

8. The Fresnel arc lens according to claim 7, wherein: The width of the first light-concentrating area is 10.4 ± 0.5 mm, and the height is 15.79 ± 0.5 mm; the width of the second light-concentrating area is 5 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the third light-concentrating area is 3.5 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the fourth light-concentrating area is 4.25 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the fifth light-concentrating area is 4.75 ± 0.5 mm, and the height is 14.79 ± 0.5 mm; the width of the sixth light-concentrating area is 10.05 ± 0.5 mm, and the height is 15. The width of the seventh light condensing area is 10.4 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the eighth light condensing area is 5 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the ninth light condensing area is 3.5 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the tenth light condensing area is 4.25 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the eleventh light condensing area is 4.75 ± 0.5 mm, and the height is 4 ± 0.5 mm; the width of the twelfth light condensing area is 10.05 ± 0.5 mm, and the height is 4 ± 0.5 mm; The width of the thirteenth light condensing area is 10.4 ± 0.5 mm, and the height is 8.61 ± 0.5 mm; the width of the fourteenth light condensing area is 5 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the fifteenth light condensing area is 3.5 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the sixteenth light condensing area is 4.25 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the seventeenth light condensing area is 4.75 ± 0.5 mm, and the height is 4.5 ± 0.5 mm; the width of the eighteenth light condensing area is 10.05 ± 0.5 mm, and the height is 8.61 ± 0.5 mm; The width of the nineteenth light condensing area is 5 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twentieth light condensing area is 3.5 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twenty - first light condensing area is 4.25 ± 0.5 mm, and the height is 5.11 ± 0.5 mm; the width of the twenty - second light condensing area is 4.75 ± 0.5 mm, and the height is 5.11 ± 0.5 mm.

Images