Special-shaped Fresnel lens

Abstract

The utility model discloses a special-shaped Fresnel lens, which belongs to the technical field of Fresnel lenses and comprises a waist-shaped lens main body, a lens grain layer with a two-layer structure is arranged on the back surface of the lens main body, a convex eave is arranged on the outer side of the peripheral edge of the lens main body, and a side eave which is perpendicular to the convex eave and is bent outwards is arranged at the top of the convex eave. According to the utility model, the lens can be installed in a downward inclined manner, and the lens main body with radian can reach a 90-degree detection angle within a limited range of the lens and a detection range 8 meters in front by utilizing the lens grain design of the lens grain layer. And the lens main body can be fixedly mounted on a customer product from inside to outside through the convex eave and the edge eave at the top of the convex eave, so that the appearance is matched and more attractive, and meanwhile, the mounting is firmer. According to the utility model, short-distance and long-distance detection can be partitioned through the lens lines of the lens line layer, meanwhile, the lens is particularly sensitive to a transverse moving object, and the lens is particularly 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 special-shaped Fresnel 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 cannot sense laterally moving objects, and the detection range is too small to meet customer needs. Therefore, a new type of lens needs to be developed to meet application requirements. Utility Model Content

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

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

[0006] A special-shaped Fresnel lens comprises a lens body with a waist-shaped structure, a lens texture layer provided on the back of the lens body, the lens texture layer being a two-layer structure, and the lens body having an outwardly convex curvature; convex eaves are provided on the outer sides of the four edges of the lens body, and a side eave is provided on the top of the convex eave, which is perpendicular to the convex eave and bent outward, and the convex eave and the side eave are used to limit the lens body.

[0007] Preferably, the lens body is arranged obliquely relative to the eaves, the distance between the outer arc side of the lens body and the eaves is smaller than the distance between the inner arc side of the lens body and the eaves, and the outer arc side and the inner arc side of the lens body are connected by inclined circular arc transitions at both ends; the cross-section of the convex eaves and the inner and outer edges of the eaves are both waist-shaped structures that match the lens body.

[0008] Preferably, the lens pattern layer is arranged in the middle arc section of the lens body, and the lens pattern layer is composed of 18 Fresnel patterns.

[0009] Preferably, the lens can be installed with a downward tilt of 20-30 degrees, the detection angle of the lens texture layer is 90 degrees, and the detection distance is 8 meters.

[0010] Preferably, the middle of the lens pattern layer is formed by three rows of light-focusing areas, two rows of light-focusing areas are formed symmetrically on both sides, and two rows of light-focusing areas are formed adjacent to one row of light-focusing areas on both sides. All the light-focusing areas are symmetrically distributed along the central axis of the lens pattern layer.

[0011] The first row of focusing areas on the left half of the lens texture layer are, from left to right, the first focusing area, the second focusing area and the third focusing area; the first row of focusing areas are, from left to right, the fifth focusing area, the sixth focusing area and the seventh focusing area; the left half of the third row of focusing areas in the middle are, from left to right, the ninth focusing area and the tenth focusing area; the middle of the lens texture layer are, from top to bottom, the fourth focusing area and the eighth focusing area; the area of ​​the first focusing area on both sides is larger than that of the other focusing areas.

[0012] Preferably, the width of the first focusing area is 3.46±0.5mm and the height is 11.05±0.5mm; the width of the second focusing area is 3.38±0.5mm and the height is 7.49±0.5mm; the width of the third focusing area is 3.38±0.5mm and the height is 5.85±0.5mm; the width of the fourth focusing area is 3.5±0.5mm and the height is 5.09±0.5mm; the width of the fifth focusing area is 2.5±0.5mm and the height is 4. 29±0.5mm; the width of the sixth focusing area is 2.38±0.5mm, and the height is 2.5±0.5mm; the width of the seventh focusing area is 2.38±0.5mm, and the height is 2.5±0.5mm; the width of the eighth focusing area is 2.5±0.5mm, and the height is 2.5±0.5mm; the width of the ninth focusing area is 3±0.5mm, and the height is 2.32±0.5mm; the width of the tenth focusing area is 3±0.5mm, and the height is 2.5±0.5mm.

[0013] Preferably, the lens body, the convex eaves and the side eaves are integrally formed.

[0014] Preferably, the thickness of the lens body is 0.5-0.8 mm, the thickness of the convex eave is 0.73±0.05 mm, and the width of the side eave is 2.7 (+0.05 / -0.1) mm.

[0015] Compared with the prior art, the technical progress achieved by this utility model is:

[0016] This new device utilizes a two-layer lens pattern layer on the back of a waist-shaped lens body to expand the detection range. The lens body, through its raised eaves and top edge, can be fixed from the inside out onto the product to be installed, creating a more aesthetically pleasing appearance and a more secure installation. This device can be installed at a downward angle, and the patterned design of the lens pattern layer enables a 90-degree detection angle and a forward detection range of 8 meters within the limited range of the lens. The patterned lens pattern layer in this device allows for zoned detection for both near- and long-range detection, while also being particularly sensitive to laterally moving objects. This makes it particularly suitable for smart IP camera applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] In the attached figure:

[0019] Figure 1 A three-dimensional diagram of a special-shaped Fresnel lens provided in an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the outer side of the lens body of the special-shaped Fresnel lens in an embodiment of the present utility model;

[0021] Figure 3 for Figure 1 Layout diagram of the lens texture layer on the back of the lens body of a medium-profile Fresnel lens;

[0022] Figure 4 for Figure 1 Main view of the medium profile Fresnel lens;

[0023] Figure 5 for Figure 4 Rear view of the medium profile Fresnel lens;

[0024] Figure 6 for Figure 5 Left view of the medium profile Fresnel lens;

[0025] In the picture:

[0026] 100-lens body, 101-lens texture layer, 102-convex eaves, 103-edge eaves; 104-outer arc side, 105-inner arc side;

[0027] 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

[0028] 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.

[0029] like Figure 1 、 Figure 2 and Figure 3 The figure shows a shaped Fresnel lens comprising a waist-shaped lens body 100. A two-layer lens pattern layer 101 is applied to the back of the lens body 100, and the lens body 100 has an outwardly convex curvature. Around the edges of the lens body 100 are convex ridges 102, with a vertical, outward-curved edge ridge 103 at the top. These ridges 102 and edge ridges 103 serve to position the lens body 100. The ridges and edge ridges allow the lens to be inserted from the inside out through the mounting hole of the product to be installed, ensuring a more secure installation. The lens also matches the product's appearance, and the pattern is invisible on the outside of the lens, enhancing its aesthetics. The lens can be installed at a downward angle of 20-30 degrees. The pattern design of the lens pattern layer allows for zoned detection for near and long distances. The curved lens body achieves a 90-degree detection angle and a forward detection range of up to 8 meters. This lens is particularly sensitive to lateral movement of objects and is suitable for application scenarios of smart cameras IP cameras.

[0030] As a preferred structure, Figure 2-Figure 6As shown, the lens body 100 is tilted relative to the edge 103. The distance between the outer arc side 104 of the lens body 100 and the edge 103 is smaller than the distance between the inner arc side 105 of the lens body 100 and the edge 103. The outer arc side 104 and the inner arc side 105 of the lens body 100 are connected by an inclined circular arc transition at both ends. The cross-section of the convex edge 102 and the inner and outer edges of the edge 103 are waist-shaped structures that match the lens body 100. Lenses using this structure can be installed with a downward tilt of 20-30 degrees. The detection angle of the lens pattern layer 101 is 90 degrees, and the detection distance is 8 meters. During installation, the lens can be installed at three downward tilt angles: 20°, 25°, and 30°, all of which can achieve the desired detection effect.

[0031] When designing specifically, Figure 3 As shown, the lens pattern layer 101 is located in the central curved section of the lens body 100. It is composed of 18 Fresnel patterns. The center of the lens pattern layer 101 has three rows of focusing zones, two rows of focusing zones symmetrically on either side, and two rows of focusing zones immediately adjacent to one of the focusing zones. All focusing zones are symmetrically distributed along the central axis of the lens pattern layer 101. Due to the curvature of the lens body, this partitioning allows for upper and lower sections. The lower section primarily detects short-range vision, while the upper section primarily handles long-range vision.

[0032] During specific production, the lens body 100, the convex eaves 102 and the side eaves 103 are integrally formed, the production process is simple, and it is suitable for mass production.

[0033] exist Figure 3 In the illustrated embodiment, the lens body 100 has a thickness of 0.5-0.8 mm, the convex eave 102 has a thickness of 0.73 ± 0.05 mm, and the edge eave 103 has a width of 2.7 (+0.05 / -0.1) mm. The first row of light-focusing zones on the left half of the lens pattern layer 101, from left to right, consists of the first light-focusing zone 1, the second light-focusing zone 2, and the third light-focusing zone 3. The first row of light-focusing zones, from left to right, consists of the fifth light-focusing zone 5, the sixth light-focusing zone 6, and the seventh light-focusing zone 7. The left half of the third row of light-focusing zones in the middle, from left to right, consists of the ninth light-focusing zone 9 and the tenth light-focusing zone 10. The middle portion of the lens pattern layer, from top to bottom, consists of the fourth light-focusing zone 4 and the eighth light-focusing zone 8. The area of ​​the first light-focusing zones 1 on both sides is larger than that of the other light-focusing zones.

[0034] The specific production dimensions are as follows: the width of the first focusing area 1 is 3.46±0.5mm and the height is 11.05±0.5mm; the width of the second focusing area 2 is 3.38±0.5mm and the height is 7.49±0.5mm; the width of the third focusing area 3 is 3.38±0.5mm and the height is 5.85±0.5mm; the width of the fourth focusing area 4 is 3.5±0.5mm and the height is 5.09±0.5mm; the width of the fifth focusing area 5 is 2.5±0.5mm and the height is 4.29±0.5mm; the width of the sixth focusing area 6 is 2.38±0.5mm, and the height is 2.5±0.5mm; the width of the seventh focusing area 7 is 2.38±0.5mm, and the height is 2.5±0.5mm; the width of the eighth focusing area 8 is 2.5±0.5mm, and the height is 2.5±0.5mm; the width of the ninth focusing area 9 is 3±0.5mm, and the height is 2.32±0.5mm; the width of the tenth focusing area 10 is 3±0.5mm, and the height is 2.5±0.5mm.

[0035] This new device boasts a simple structure, wide detection angles, and long range. By placing a lens pattern layer composed of 18 Fresnel patterns on the back of the lens body, the two-layer design features an upper focusing area capable of detecting distant objects, while a lower focusing area can detect close distances. The curved lens, tilted downward 20-30°, ensures energy absorption at all angles, enabling detection angles exceeding 90° and a range extending up to 8 meters in front. It is also particularly sensitive to lateral movement of objects. Furthermore, the integrated lens molding simplifies the manufacturing process and reduces production costs. The exterior of the lens features a glossy black finish, and the "mirror pattern" of the lens pattern layer is invisible, enhancing its aesthetic appearance. This device is particularly suitable for outdoor applications of smart IP cameras.

[0036] 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 special-shaped Fresnel lens, characterized by: The lens includes a lens body with a waist-shaped structure, a lens texture layer is provided on the back of the lens body, the lens texture layer is a two-layer structure, and the lens body is provided with an outwardly convex curvature; a convex eave is provided on the outer side of the four edges of the lens body, and the top of the convex eave is provided with a side eave that is perpendicular to the convex eave and bent toward the outside, and the convex eave and the side eave are used to limit the lens body.

2. The special-shaped Fresnel lens according to claim 1, characterized in that: The lens body is arranged obliquely relative to the edge eaves, the distance between the outer arc side of the lens body and the edge eaves is smaller than the distance between the inner arc side of the lens body and the edge eaves, and the outer arc side and the inner arc side of the lens body are connected by inclined circular arc transitions at both ends; the cross section of the convex eaves and the inner and outer edges of the edge eaves are all waist-shaped structures that match the lens body.

3. The special-shaped Fresnel lens according to claim 1, characterized in that: The lens pattern layer is arranged in the middle arc section of the lens body, and the lens pattern layer is composed of 18 Fresnel patterns.

4. The special-shaped Fresnel lens according to claim 3, characterized in that: The detection angle of the lens texture layer is 90 degrees and the detection distance is 8 meters.

5. The special-shaped Fresnel lens according to claim 3, characterized in that: The lens pattern layer has three rows of light-focusing areas in the middle, one row of light-focusing areas symmetrically on both sides, and two rows of light-focusing areas adjacent to one row of light-focusing areas on both sides. All the light-focusing areas are symmetrically distributed along the central axis of the lens pattern layer. The first row of focusing areas on the left half of the lens texture layer are, from left to right, the first focusing area, the second focusing area and the third focusing area; the first row of focusing areas are, from left to right, the fifth focusing area, the sixth focusing area and the seventh focusing area; the left half of the third row of focusing areas in the middle are, from left to right, the ninth focusing area and the tenth focusing area; the middle of the lens texture layer are, from top to bottom, the fourth focusing area and the eighth focusing area; the area of ​​the first focusing area on both sides is larger than that of the other focusing areas.

6. The special-shaped Fresnel lens according to claim 5, characterized in that: The width of the first focusing area is 3.46±0.5mm and the height is 11.05±0.5mm; the width of the second focusing area is 3.38±0.5mm and the height is 7.49±0.5mm; the width of the third focusing area is 3.38±0.5mm and the height is 5.85±0.5mm; the width of the fourth focusing area is 3.5±0.5mm and the height is 5.09±0.5mm; the width of the fifth focusing area is 2.5±0.5mm and the height is 4.29 ±0.5mm; the width of the sixth focusing area is 2.38±0.5mm, and the height is 2.5±0.5mm; the width of the seventh focusing area is 2.38±0.5mm, and the height is 2.5±0.5mm; the width of the eighth focusing area is 2.5±0.5mm, and the height is 2.5±0.5mm; the width of the ninth focusing area is 3±0.5mm, and the height is 2.32±0.5mm; the width of the tenth focusing area is 3±0.5mm, and the height is 2.5±0.5mm.

7. The special-shaped Fresnel lens according to claim 1, characterized in that: The lens body, the convex eaves and the side eaves are integrally formed.

8. The special-shaped Fresnel lens according to any one of claims 1 to 7, characterized in that: The thickness of the lens body is 0.5-0.8 mm, the thickness of the convex eave is 0.73±0.05 mm, and the width of the side eave is 2.7 (+0.05 / -0.1) mm.

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