Fresnel polygonal lens

Abstract

The utility model discloses a Fresnel polygonal lens, which belongs to the technical field of Fresnel lenses and comprises a lens main body with a polygonal structure, a lens grain layer on the back of the lens main body is of a four-layer structure, and the lens grain layer is composed of 26 pieces of Fresnel grains in parallel. The four lens grain layers are arranged on the back surface of the lens main body, and the lens grain layer formed by combining 26 Fresnel grains can meet the long-distance detection requirement; meanwhile, the polygonal lens is adopted, can be matched with the appearance of a customer product, and is attractive in appearance and convenient to assemble. The lens can be hung at the height of 3 meters, only one sensor needs to be matched by utilizing the lens grain design of the lens grain layer, the detection angle in the limited range of the lens reaches 90 degrees, and the detection range can reach 30 meters away from the front. According to the utility model, the 26 pieces of Fresnel textures can be partitioned to meet the detection requirements of short distance, long distance and large angle, and the camera is especially suitable for the application situation of an intelligent camera IP Camera.

Description

Technical Field

[0001] The utility model belongs to the technical field of Fresnel lenses, in particular to a Fresnel polygonal lens. Background Art

[0002] A Fresnel lens utilizes the focusing optical principle of a lens to create an alternating "blind zone" and "high-sensitivity zone" of light absorption in front of the detector, thereby enhancing its detection and reception sensitivity. When a person walks in front of the lens, the infrared light emitted by the human body alternates between the "blind zone" and the "high-sensitivity zone," causing the received infrared signal to enter in the form of intermittent pulses, thereby increasing its energy amplitude. A Fresnel lens is equivalent to a convex lens for infrared and visible light, providing superior performance while being much less expensive and easier to manufacture than a conventional convex lens.

[0003] The existing Fresnel lens has a small detection range and a short detection distance, and is particularly unable to meet the needs of long-distance detection. Therefore, it is necessary to develop a new type of lens to meet application requirements. Utility Model Content

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

[0005] In order to achieve the above purpose, the technical solutions adopted by the present utility model are as follows:

[0006] A Fresnel polygonal lens comprises a lens body with a polygonal shape. A lens pattern layer is provided on the back of the lens body. The lens pattern layer has a four-layer structure and is composed of 26 Fresnel patterns arranged in parallel.

[0007] Preferably, the edges of the lens body are provided with convex eaves bent toward the inside, and the middle part of the convex eaves is provided with side eaves perpendicular to the convex eaves and facing outward; the convex eaves and side eaves are used to limit the lens body, and the inner and outer edges of the convex eaves and side eaves are polygons that match the lens body.

[0008] Preferably, the lens body is rectangular, and chamfers are provided at the four corners, and the chamfers on both sides are asymmetrical, and the inner and outer edges of the convex eaves and the side eaves match the shape of the lens body.

[0009] Preferably, the lens body, the convex eaves and the side eaves are integrally formed.

[0010] Preferably, the detection angle of the lens pattern layer is 90 degrees, and the detection distance is 30 meters.

[0011] Preferably, the thickness of the lens body is 0.5-0.8 mm.

[0012] Preferably, the thickness of the lens body is 0.60±0.10 mm, and the thickness of the edge is 0.50±0.10 mm.

[0013] Preferably, the left and right sides of the lens texture layer are three rows of focusing areas from top to bottom, and the middle is four rows of focusing areas. The first row of focusing areas on the left and right sides and the middle of the lens texture layer are, from left to right, the first focusing area, the second focusing area, the third focusing area, the fourth focusing area, the fifth focusing area, the sixth focusing area and the seventh focusing area; the second row of focusing areas on the left and right sides and the middle of the lens texture layer are, from left to right, the eighth focusing area, the ninth focusing area, the tenth focusing area, the eleventh focusing area, the twelfth focusing area, the tenth focusing area The third row of light-gathering areas on the left and right sides of the lens texture layer are the fifteenth light-gathering area and the twenty-first light-gathering area respectively; the third row of light-gathering areas in the middle of the lens texture layer are, from left to right, the sixteenth light-gathering area, the seventeenth light-gathering area, the eighteenth light-gathering area, the nineteenth light-gathering area and the twentieth light-gathering area; the fourth row of light-gathering areas in the middle of the lens texture layer are, from left to right, the twenty-second light-gathering area, the twenty-third light-gathering area, the twenty-fourth light-gathering area, the twenty-fifth light-gathering area and the twenty-sixth light-gathering area;

[0014] The areas of the first, second, third, fourth, fifth, sixth and seventh light focusing areas of the first row of light focusing areas are larger than the areas of the light focusing areas of the following rows in the same column.

[0015] Preferably, the width of the first focusing area is 6.37±0.5mm, and the height is 17.48±0.5mm; the width of the second focusing area is 6.2±0.5mm, and the height is 19.28±0.5mm; the width of the third focusing area is 5.5±0.5mm, and the height is 19.28±0.5mm; the width of the fourth focusing area is 9.3±0.5mm, and the height is 19.28±0.5mm; the width of the fifth focusing area is 5.5±0.5mm, and the height is 19.28±0.5mm; the width of the sixth focusing area is 6.2±0.5mm, and the height is 19.28±0.5mm; and the width of the seventh focusing area is 6.39±0.5mm, and the height is 18.21±0.5mm.

[0016] The eighth light-focusing area has a width of 6.37±0.5mm and a height of 6.5±0.5mm; the ninth light-focusing area has a width of 6.2±0.5mm and a height of 6.5±0.5mm; the tenth light-focusing area has a width of 6.5±0.5mm and a height of 6.5±0.5mm; the eleventh light-focusing area has a width of 7.3±0.5mm and a height of 6.5±0.5mm; the twelfth light-focusing area has a width of 6.5±0.5mm and a height of 6.5±0.5mm; the thirteenth light-focusing area has a width of 6.2±0.5mm and a height of 6.5±0.5mm; and the fourteenth light-focusing area has a width of 6.39±0.5mm and a height of 6.5±0.5mm.

[0017] The width of the fifteenth light-focusing area is 6.37±0.5mm, and the height is 10.79±0.5mm. The width of the sixteenth light-focusing area is 6.2±0.5mm, and the height is 6.5±0.5mm. The width of the seventeenth light-focusing area is 6.5±0.5mm, and the height is 6.5±0.5mm. The width of the eighteenth light-focusing area is 7.3±0.5mm, and the height is 6.5±0.5mm. The width of the nineteenth light-focusing area is 6.5±0.5mm, and the height is 6.5±0.5mm. The width of the twentieth light-focusing area is 6.2±0.5mm, and the height is 6.5±0.5mm. The width of the twenty-first light-focusing area is 6.39±0.5mm, and the height is 11.5±0.5mm.

[0018] The width of the twenty-second focusing area is 6.2±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-third focusing area is 6.5±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-fourth focusing area is 7.3±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-fifth focusing area is 6.5±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-sixth focusing area is 6.2±0.5mm, and the height is 6.01±0.5mm.

[0019] Compared with the prior art, the technical progress achieved by this utility model is:

[0020] This new lens features a four-layer design with 26 Fresnel patterns on the back of the lens body, ensuring long-range detection. The polygonal lens design also creates an aesthetically pleasing aesthetic that complements the customer's product design. This lens can be suspended at a height of 3 meters. The lens pattern design allows for a single sensor, achieving a 90-degree detection angle within the lens's limited range and a forward detection range of up to 30 meters. The 26 Fresnel patterns in this new lens allow for zoned detection for close-range, long-range, and wide-angle detection, making it particularly suitable for smart IP camera applications. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] In the attached figure:

[0023] Figure 1 A three-dimensional diagram of a Fresnel polygonal lens provided by an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the back structure of the Fresnel polygonal lens in an embodiment of the present utility model;

[0025] Figure 3 for Figure 1 Main view of the medium Fresnel polygonal lens;

[0026] Figure 4 for Figure 3 AA cross-sectional view of the middle lens texture layer;

[0027] Figure 5 for Figure 2 Layout diagram of the middle lens texture layer.

[0028] In the picture:

[0029] 100- lens body, 101- lens texture layer, 102- convex eaves, 103- side eaves;

[0030] 1-the first light-focusing area, 2-the second light-focusing area, 3-the third light-focusing area, 4-the fourth light-focusing area, 5-the fifth light-focusing area, 6-the sixth light-focusing area, 7-the seventh light-focusing area, 8-the eighth light-focusing area, 9-the ninth light-focusing area, 10-the tenth light-focusing area, 11-the eleventh light-focusing area, 12-the twelfth light-focusing area, 13-the thirteenth light-focusing area, 14-the fourteenth light-focusing area, 15-the fifteenth light-focusing area, 16-the sixteenth light-focusing area, 17-the seventeenth light-focusing area, 18-the eighteenth light-focusing area, 19-the nineteenth light-focusing area, 20-the twentieth light-focusing area, 21-the twenty-first light-focusing area, 22-the twenty-second light-focusing area, 21-the twenty-third light-focusing area, 22-the twenty-fourth light-focusing area; 21-the twenty-fifth light-focusing area, 22-the twenty-sixth light-focusing area. DETAILED DESCRIPTION

[0031] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The following embodiments of the present invention will be described in conjunction with the accompanying drawings.

[0032] like Figure 1 、 Figure 2 and Figure 3 As shown, a Fresnel polygonal lens comprises a lens body 100 with a polygonal shape. A lens pattern layer 101 is provided on the back of the lens body 100. The lens pattern layer 101 comprises a four-layer structure consisting of 26 parallel Fresnel patterns. The lens body 100 is provided with an inwardly bent convex 102 on all four edges. A side convex 103 is provided in the middle of the convex 102, perpendicular to the convex 102 and facing outward. The convex 102 and side convex 103 are used to limit the position of the lens body 100. The inner and outer edges of the convex 102 and side convex 103 are polygonal and match the lens body 100. The polygonal lens not only matches the appearance of the customer's product, but also features a lens texture layer on the back, making the texture invisible from the outside for a more aesthetically pleasing appearance. The four-layer lens texture layer, composed of 26 Fresnel patterns, allows for zoned detection for close-range, long-range, and wide-angle detection, particularly meeting long-range detection requirements. This device can be suspended at a height of 3 meters and requires only one sensor, achieving a detection angle of 90 degrees within the limited range of the lens and a detection range of up to 30 meters in front.

[0033] In a specific embodiment of the present invention, Figure 2-Figure 4 As shown, the lens body 100 is rectangular with chamfered corners, and the chamfers on both sides are asymmetrical. The inner and outer edges of the convex eave 102 and the side eave 103 match the shape of the lens body 100. The asymmetrical fool-proof design prevents installation errors, and the three-dimensional structure can be nested within the appearance of the customer's product, perfectly matching the appearance of the customer's product.

[0034] During specific manufacturing, the thickness of the lens body 100 is 0.5-0.8 mm. In this embodiment, the thickness of the lens body 100 is 0.60 ± 0.10 mm, and the thickness of the edge 103 is 0.50 ± 0.10 mm. Furthermore, the lens body 100, the convex edge 102, and the edge 103 are integrally formed, simplifying the manufacturing process and making them suitable for mass production.

[0035] In a specific embodiment of the present invention, Figure 2 、 Figure 5As shown, the left and right sides of the lens texture layer 101 are three rows of focusing areas from top to bottom, and the middle is four rows of focusing areas. The first row of focusing areas on the left and right sides and the middle of the lens texture layer 101 are, from left to right, the first focusing area 1, the second focusing area 2, the third focusing area 3, the fourth focusing area 4, the fifth focusing area 5, the sixth focusing area 6 and the seventh focusing area 7; the second row of focusing areas on the left and right sides and the middle of the lens texture layer 101 are, from left to right, the eighth focusing area 8, the ninth focusing area 9, the tenth focusing area 10, the eleventh focusing area 11, the twelfth focusing area 12, the thirteenth focusing area 13 and The fourteenth light-focusing area 14; the third rows of light-focusing areas on the left and right sides of the lens texture layer 101 are the fifteenth light-focusing area 15 and the twenty-first light-focusing area 21 respectively; the third row of light-focusing areas in the middle of the lens texture layer 101 are, from left to right, the sixteenth light-focusing area 16, the seventeenth light-focusing area 17, the eighteenth light-focusing area 18, the nineteenth light-focusing area 19 and the twentieth light-focusing area 20; the fourth row of light-focusing areas in the middle of the lens texture layer 101 are, from left to right, the twenty-second light-focusing area 22, the twenty-third light-focusing area 23, the twenty-fourth light-focusing area 24, the twenty-fifth light-focusing area 25 and the twenty-sixth light-focusing area 26;

[0036] The specific manufacturing dimensions are as follows: the width of the first focusing area 1 is 6.37±0.5mm, and the height is 17.48±0.5mm; the width of the second focusing area 2 is 6.2±0.5mm, and the height is 19.28±0.5mm; the width of the third focusing area 3 is 5.5±0.5mm, and the height is 19.28±0.5mm; the width of the fourth focusing area 4 is 9.3±0.5mm, and the height is 19.28±0.5mm; the width of the fifth focusing area 5 is 5.5±0.5mm, and the height is 19.28±0.5mm; the width of the sixth focusing area 6 is 6.2±0.5mm, and the height is 19.28±0.5mm; the width of the seventh focusing area 7 is 6.39±0.5mm, and the height is 18.21±0.5mm;

[0037] The eighth light-focusing area 8 has a width of 6.37±0.5mm and a height of 6.5±0.5mm; the ninth light-focusing area 9 has a width of 6.2±0.5mm and a height of 6.5±0.5mm; the tenth light-focusing area 10 has a width of 6.5±0.5mm and a height of 6.5±0.5mm; the eleventh light-focusing area 11 has a width of 7.3±0.5mm and a height of 6.5±0.5mm; the twelfth light-focusing area 12 has a width of 6.5±0.5mm and a height of 6.5±0.5mm; the thirteenth light-focusing area 13 has a width of 6.2±0.5mm and a height of 6.5±0.5mm; and the fourteenth light-focusing area 14 has a width of 6.39±0.5mm and a height of 6.5±0.5mm.

[0038] The fifteenth light-focusing area 15 has a width of 6.37±0.5 mm and a height of 10.79±0.5 mm. The sixteenth light-focusing area 16 has a width of 6.2±0.5 mm and a height of 6.5±0.5 mm. The seventeenth light-focusing area 17 has a width of 6.5±0.5 mm and a height of 6.5±0.5 mm. The eighteenth light-focusing area 18 has a width of 7.3±0.5 mm and a height of 6.5±0.5 mm. The nineteenth light-focusing area 19 has a width of 6.5±0.5 mm and a height of 6.5±0.5 mm. The twentieth light-focusing area 20 has a width of 6.2±0.5 mm and a height of 6.5±0.5 mm. The twenty-first light-focusing area 21 has a width of 6.39±0.5 mm and a height of 11.5±0.5 mm.

[0039] The width of the twenty-second focusing area 22 is 6.2±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-third focusing area 23 is 6.5±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-fourth focusing area 24 is 7.3±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-fifth focusing area 25 is 6.5±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-sixth focusing area 26 is 6.2±0.5mm, and the height is 6.01±0.5mm.

[0040] With the lens pattern layer 101 designed as described above, the areas of the first, second, third, fourth, fifth, sixth, and seventh light-focusing zones (1, 2, 3, 4, 5, 6, and 7) in the first row of light-focusing zones are larger than the areas of the light-focusing zones in the same columns below. The three rows of light-focusing zones in the lower middle portion of the lens pattern layer 101 are primarily responsible for close-range detection; the top row of light-focusing zones is primarily for long-range detection, while the light-focusing zones on either side ensure wide-angle detection. The lens pattern layer 101 employing the aforementioned mirror pattern design can achieve a detection range of 90 degrees and a detection distance of 30 meters in front. Furthermore, the Fresnel pattern is only visible from the back of the lens, not from the front, enhancing the appearance.

[0041] This new device boasts a simple structure, wide detection angle, and long range. By applying a lens pattern layer composed of 26 Fresnel patterns on the back of the lens body, the four-layer design, combined with a single sensor, achieves a detection angle exceeding 90 degrees, with a detection range of up to 30 meters ahead. The asymmetrical design on both sides prevents assembly errors. The three-dimensional side and convex edges perfectly complement the customer's product, and the glossy black exterior surface enhances the aesthetics. When used, the lens can be suspended at a height of 3 meters, meeting the requirements for wide-angle and long-range detection. This device is particularly well-suited for smart IP camera applications.

[0042] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A Fresnel polygonal lens, characterized by: The lens body comprises a polygonal structure. The back of the lens body is provided with a lens texture layer. The lens texture layer is a four-layer structure and is composed of 26 Fresnel textures arranged in parallel.

2. The Fresnel polygon lens according to claim 1, characterized in that: The edges of the lens body are provided with convex eaves bent toward the inside, and the middle part of the convex eaves is provided with side eaves perpendicular to the convex eaves and facing outward; the convex eaves and side eaves are used to limit the lens body, and the inner and outer edges of the convex eaves and side eaves are polygons that match the lens body.

3. The Fresnel polygon lens according to claim 2, characterized in that: The lens body is rectangular, and chamfers are provided at the four corners, and the chamfers on both sides are asymmetrical. The inner and outer edges of the convex eaves and the side eaves match the shape of the lens body.

4. The Fresnel polygon lens according to claim 2, wherein: The lens body, the convex eaves and the side eaves are integrally formed.

5. The Fresnel polygon lens according to claim 1, characterized in that: The detection angle of the lens texture layer is 90 degrees and the detection distance is 30 meters.

6. The Fresnel polygon lens according to claim 2, characterized in that: The thickness of the lens body is 0.5-0.8 mm.

7. The Fresnel polygon lens according to claim 6, characterized in that: The thickness of the lens body is 0.60±0.10 mm, and the thickness of the edge is 0.50±0.10 mm.

8. The Fresnel polygon lens according to any one of claims 1 to 7, characterized in that: The left and right sides of the lens texture layer are three rows of focusing areas from top to bottom, and the middle is four rows of focusing areas. The first row of focusing areas on the left and right sides and the middle of the lens texture layer are the first focusing area, the second focusing area, the third focusing area, the fourth focusing area, the fifth focusing area, the sixth focusing area and the seventh focusing area from left to right; the second row of focusing areas on the left and right sides and the middle of the lens texture layer are the eighth focusing area, the ninth focusing area, the tenth focusing area, the eleventh focusing area, the twelfth focusing area, the thirteenth focusing area The third row of light focusing areas on the left and right sides of the lens texture layer are the fifteenth light focusing area and the twenty-first light focusing area respectively; the third row of light focusing areas in the middle of the lens texture layer are, from left to right, the sixteenth light focusing area, the seventeenth light focusing area, the eighteenth light focusing area, the nineteenth light focusing area and the twentieth light focusing area; the fourth row of light focusing areas in the middle of the lens texture layer are, from left to right, the twenty-second light focusing area, the twenty-third light focusing area, the twenty-fourth light focusing area, the twenty-fifth light focusing area and the twenty-sixth light focusing area; The areas of the first, second, third, fourth, fifth, sixth and seventh light focusing areas of the first row of light focusing areas are larger than the areas of the light focusing areas of the following rows in the same column.

9. The Fresnel polygon lens according to claim 8, characterized in that: The width of the first focusing area is 6.37±0.5mm, and the height is 17.48±0.5mm; the width of the second focusing area is 6.2±0.5mm, and the height is 19.28±0.5mm; the width of the third focusing area is 5.5±0.5mm, and the height is 19.28±0.5mm; the width of the fourth focusing area is 9.3±0.5mm, and the height is 19.28±0.5mm; the width of the fifth focusing area is 5.5±0.5mm, and the height is 19.28±0.5mm; the width of the sixth focusing area is 6.2±0.5mm, and the height is 19.28±0.5mm; and the width of the seventh focusing area is 6.39±0.5mm, and the height is 18.21±0.5mm. The eighth light-focusing area has a width of 6.37±0.5mm and a height of 6.5±0.5mm; the ninth light-focusing area has a width of 6.2±0.5mm and a height of 6.5±0.5mm; the tenth light-focusing area has a width of 6.5±0.5mm and a height of 6.5±0.5mm; the eleventh light-focusing area has a width of 7.3±0.5mm and a height of 6.5±0.5mm; the twelfth light-focusing area has a width of 6.5±0.5mm and a height of 6.5±0.5mm; the thirteenth light-focusing area has a width of 6.2±0.5mm and a height of 6.5±0.5mm; and the fourteenth light-focusing area has a width of 6.39±0.5mm and a height of 6.5±0.5mm. The width of the fifteenth light-focusing area is 6.37±0.5mm, and the height is 10.79±0.5mm. The width of the sixteenth light-focusing area is 6.2±0.5mm, and the height is 6.5±0.5mm. The width of the seventeenth light-focusing area is 6.5±0.5mm, and the height is 6.5±0.5mm. The width of the eighteenth light-focusing area is 7.3±0.5mm, and the height is 6.5±0.5mm. The width of the nineteenth light-focusing area is 6.5±0.5mm, and the height is 6.5±0.5mm. The width of the twentieth light-focusing area is 6.2±0.5mm, and the height is 6.5±0.5mm. The width of the twenty-first light-focusing area is 6.39±0.5mm, and the height is 11.5±0.5mm. The width of the twenty-second focusing area is 6.2±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-third focusing area is 6.5±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-fourth focusing area is 7.3±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-fifth focusing area is 6.5±0.5mm, and the height is 6.01±0.5mm; the width of the twenty-sixth focusing area is 6.2±0.5mm, and the height is 6.01±0.5mm.

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