Fresnel disc lens

Abstract

The utility model discloses a Fresnel disc lens, which belongs to the technical field of Fresnel lenses and comprises a disc-shaped lens main body, the outer side of the lens main body is a convex cambered surface, the inner side of the lens main body is a concave cambered surface, cylindrical convex eaves are arranged on the periphery of the lens main body, and a lens grain layer is arranged on the inner side of the back of the lens main body. And each lens grain layer is formed by combining 17 Fresnel grains. The disc-shaped lens main body is provided with an arc surface with a convex outer side and a concave back surface, the lens grain layer is responsible for energy absorption at various angles, the detection angle within the limited range of the lens reaches more than 120 degrees, and the detection range reaches 10 meters away from the front. According to the utility model, the lens with radian is adopted, so that the large-angle and long-distance detection requirements are better met, large-angle and long-distance detection can be realized in a limited range of the lens, and the lens is particularly sensitive to transverse movement of an object; the appearance is small and beautiful, and the assembly is convenient. The intelligent IP Camera is especially suitable for the application situation of the intelligent IP Camera and can be conveniently placed outdoors for use.

Description

Technical Field

[0001] The utility model belongs to the technical field of Fresnel lenses, in particular to a Fresnel disc 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 than ordinary convex lenses and easier to manufacture. It is often used in applications where precision is not a priority, such as slide projectors, film magnifiers, and infrared detectors.

[0003] The existing lens has a small detection range and short detection distance, and cannot quickly capture the lateral movement of objects. 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 Fresnel disk lens.

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

[0006] A Fresnel disc lens comprises a disc-shaped lens body, wherein the outer side of the lens body is a convex arc surface and the inner side is a concave arc surface, cylindrical convex eaves are provided on all four sides of the lens body, and a lens pattern layer is provided on the inner side of the back surface of the lens body, wherein the lens pattern layer is composed of 17 Fresnel patterns.

[0007] Preferably, the top of the convex eaves around the lens body is provided with an eave bent 180° toward the outside, and the outer edge of the eaves is provided with two positioning protrusions. The eaves and the positioning protrusions are in the same plane, and the angle between the plane and the vertical plane is 15°, which is used to make the lens body tilt downward 15°.

[0008] Preferably, the detection angle of the lens pattern layer is 120° and the detection distance is 10 meters.

[0009] Preferably, the thickness of the lens body is 0.5-0.8 mm.

[0010] Furthermore, the thickness of the middle portion of the lens body is 0.60±0.1 mm, and the thickness of the edge is 0.6±0.05 mm.

[0011] Preferably, the lens body, the convex eaves and the side eaves are integrally formed.

[0012] Preferably, the 17 Fresnel patterns are divided into a first row of focusing areas, a second row of focusing areas and a third row of focusing areas from top to bottom. The first row of focusing areas and the second row of focusing areas are each arranged in parallel with seven focusing areas from left to right, and the third row of focusing areas is each arranged in parallel with three focusing areas from left to right; the three rows of focusing areas are symmetrically distributed along the central axis of the lens pattern layer.

[0013] Preferably, the areas of the seven light-focusing areas in the first row of light-focusing areas are all larger than the areas of the seven light-focusing areas in the second row of light-focusing areas and the areas of the three light-focusing areas in the third row of light-focusing areas.

[0014] Preferably, the 17 Fresnel patterns are respectively a first light-concentrating area, a second light-concentrating area, a third light-concentrating area, a fourth light-concentrating area, a fifth light-concentrating area, a sixth light-concentrating area, a seventh light-concentrating area, an eighth light-concentrating area, a ninth light-concentrating area, and a tenth light-concentrating area; the fourth light-concentrating area, the eighth light-concentrating area, and the tenth light-concentrating area are arranged in the middle of the lens pattern layer, the first light-concentrating area, the second light-concentrating area, the third light-concentrating area, the fifth light-concentrating area, the sixth light-concentrating area, the seventh light-concentrating area, and the ninth light-concentrating area are each provided in two, the two first light-concentrating areas, the second light-concentrating areas, and the third light-concentrating areas are symmetrically arranged on both sides of the fourth light-concentrating area, the two fifth light-concentrating areas, the sixth light-concentrating areas, and the seventh light-concentrating areas are symmetrically arranged on both sides of the eighth light-concentrating area, and the two ninth light-concentrating areas are symmetrically arranged on both sides of the tenth light-concentrating area;

[0015] The fourth focusing area and the two first focusing areas, the second focusing area, and the third focusing area are the first row of focusing areas; the eighth focusing area and the two fifth focusing areas, the sixth focusing area, and the seventh focusing area are the second row of focusing areas; the tenth focusing area and the two ninth focusing areas are the third row of focusing areas.

[0016] Preferably, the width of the first focusing area is 2.01±0.5mm and the height is 8.20±0.5mm; the width of the second focusing area is 2.7±0.5mm and the height is 10.51±0.5mm; the width of the third focusing area is 2.85±0.5mm and the height is 11.54±0.5mm; the width of the fourth focusing area is 3.4±0.5mm and the height is 12.71±0.5mm; the width of the fifth focusing area is 2.68±0.5mm and the height is 4.4±0.5mm. 0.5mm; the width of the sixth focusing area is 2.2±0.5mm, and the height is 3.88±0.5mm; the width of the seventh focusing area is 2.35±0.5mm, and the height is 3.88±0.5mm; the width of the eighth focusing area is 3.4±0.5mm, and the height is 2.88±0.5mm; the width of the ninth focusing area is 4.55±0.5mm, and the height is 2.78±0.5mm; the width of the tenth focusing area is 3.4±0.5mm, and the height is 2.95±0.5mm.

[0017] Compared with the prior art, the technical progress achieved by this utility model is:

[0018] This new lens features a lens pattern layer composed of 17 Fresnel patterns on the back of the lens body. The disc-shaped lens body features a curved surface with a convex outer surface and a concave back surface. This lens pattern layer absorbs energy from all angles, with the upper focusing area capable of detecting distant objects and the lower focusing area capable of detecting close-up distances. Within the limited range of the lens, the detection angle reaches over 120°, and the detection range extends out to 10 meters in front. This new lens, with its curved shape, better meets the requirements for wide-angle and long-distance detection, enabling wide-angle and long-distance detection within the limited range of the lens and being particularly sensitive to lateral movement. It also boasts a compact and aesthetically pleasing design and easy assembly. This new lens is particularly well-suited for smart IP camera applications, conveniently placed outdoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] In the attached figure:

[0021] Figure 1 A front view of a Fresnel disc lens provided by an embodiment of the present utility model;

[0022] Figure 2 A three-dimensional diagram of a Fresnel disk lens in an embodiment of the present invention;

[0023] Figure 3 for Figure 1 AA cross-section of the medium Fresnel disk lens;

[0024] Figure 4 for Figure 1 Rear view of the medium Fresnel disk lens;

[0025] Figure 5 This is a schematic diagram of the installation state of the Fresnel disc lens in the embodiment of the present utility model.

[0026] In the picture:

[0027] 100-lens body, 102-convex eaves, 103-mounting hole, 104-notch, 105-flat area;

[0028] 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. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figure 1 、 Figure 2 and Figure 3As shown, a Fresnel disc lens includes a disc-shaped lens body 100, wherein the outer side of the lens body 100 is a convex curved surface and the inner side is a concave curved surface. The lens body 100 is provided with a cylindrical convex eave 101 on all four sides, and the inner side of the back of the lens body 100 is provided with a lens texture layer 102, wherein the lens texture layer 102 is composed of 17 Fresnel textures; the detection angle of the lens texture layer 102 is 120°, and the detection distance is 10 meters. The 17 Fresnel patterns are divided from top to bottom into a first row of focusing zones, a second row of focusing zones, and a third row of focusing zones. The first and second rows of focusing zones each have seven focusing zones arranged side by side from left to right, while the third row of focusing zones has three focusing zones arranged side by side from left to right. All three rows of focusing zones are symmetrically distributed along the central axis of the lens pattern layer 102. The seven focusing zones in the first row are larger than the seven focusing zones in the second row and the three focusing zones in the third row. The disc-shaped lens body features a curved surface with a convex outer surface and a concave back surface. The lens pattern layer absorbs energy from all angles. The upper focusing zone can detect distant objects, while the lower focusing zone can detect close distances. Within the limited range of the lens, the detection angle reaches over 120°, and the detection range extends up to 10 meters in front.

[0031] In a specific embodiment of the present invention, Figure 2 、 5 As shown, the top of the convex eaves 101 around the lens body 100 is provided with an eave 103 bent 180° outward, and the outer edge of the eave 103 is provided with two positioning protrusions 104, which are convenient for accurately positioning and assembling the lens with the customer's appearance parts or products; the eaves 103 and the positioning protrusions 104 are in the same plane, and the angle between the plane and the vertical plane is 15°. After installation, the lens body 100 is tilted downward by 15°, which is convenient for large-angle detection and absorption of incident light directly in front, and a larger detection field of view.

[0032] When making specific Figure 3 As shown, the thickness of the lens body 100 is 0.5-0.8 mm. The thickness of the central portion of the lens body 100 is 0.60 ± 0.1 mm, and the thickness of the edge 103 is 0.6 ± 0.05 mm. Furthermore, the lens body 100, the convex edge 101, and the edge 103 are integrally formed, simplifying the manufacturing process and making them suitable for mass production.

[0033] In a specific embodiment of the present invention, Figure 4As shown, the 17 Fresnel patterns are respectively 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, the sixth light-concentrating area 6, the seventh light-concentrating area 7, the eighth light-concentrating area 8, the ninth light-concentrating area 9, and the tenth light-concentrating area 10; the fourth light-concentrating area 4, the eighth light-concentrating area 8, and the tenth light-concentrating area 10 are arranged in the middle of the lens pattern layer 102, and the first light-concentrating area 1, the second light-concentrating area 2, the third light-concentrating area 3, the fifth light-concentrating area 5, the sixth light-concentrating area 6, the seventh light-concentrating area 7, and the ninth light-concentrating area 9 are each provided with two, the two first light-concentrating areas 1, the second light-concentrating areas 2, and the third light-concentrating areas 3 are symmetrically arranged on both sides of the fourth light-concentrating area 4, the two fifth light-concentrating areas 5, the sixth light-concentrating areas 6, and the seventh light-concentrating areas 7 are symmetrically arranged on both sides of the eighth light-concentrating area 8, and the two ninth light-concentrating areas 9 are symmetrically arranged on both sides of the tenth light-concentrating area 10;

[0034] The fourth focusing area 4 and the two first focusing areas 1, the second focusing area 2, and the third focusing area 3 are the first row of focusing areas; the eighth focusing area 8 and the two fifth focusing areas 5, the sixth focusing area 6, and the seventh focusing area 7 are the second row of focusing areas; the tenth focusing area 10 and the two ninth focusing areas 9 are the third row of focusing areas.

[0035] The specific manufacturing dimensions are as follows: the width of the first focusing area 1 is 2.01±0.5mm and the height is 8.20±0.5mm; the width of the second focusing area 2 is 2.7±0.5mm and the height is 10.51±0.5mm; the width of the third focusing area 3 is 2.85±0.5mm and the height is 11.54±0.5mm; the width of the fourth focusing area 4 is 3.4±0.5mm and the height is 12.71±0.5mm; the width of the fifth focusing area 5 is 2.68±0.5mm and the height is 4. 4±0.5mm; the width of the sixth focusing area 6 is 2.2±0.5mm, and the height is 3.88±0.5mm; the width of the seventh focusing area 7 is 2.35±0.5mm, and the height is 3.88±0.5mm; the width of the eighth focusing area 8 is 3.4±0.5mm, and the height is 2.88±0.5mm; the width of the ninth focusing area 9 is 4.55±0.5mm, and the height is 2.78±0.5mm; the width of the tenth focusing area 10 is 3.4±0.5mm, and the height is 2.95±0.5mm.

[0036] The areas of the seven vertically divided light-focusing areas in the first row of light-focusing areas are designed to be larger than the areas of the seven vertically divided light-focusing areas in the second row of light-focusing areas and the three vertically divided light-focusing areas in the third row of light-focusing areas. This is conducive to absorbing energy at a large angle, and can detect distant objects from above and close distances from below, meeting the detection requirements of large angles and long and short distances.

[0037] This new camera boasts a simple structure, wide detection angles, and long range. By applying a lens pattern layer composed of 17 Fresnel patterns on the back of the lens body, the upper focusing area can detect distant objects, while the lower focusing area can detect close-up objects. By absorbing energy at various angles, the camera achieves a detection angle exceeding 120° and a detection range of up to 10 meters ahead within the limited range of the lens. Furthermore, the "mirror pattern" of the lens pattern layer is invisible from the outside, enhancing the camera's aesthetic appearance. This new camera is particularly suitable for outdoor applications of smart IP cameras.

[0038] 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 disk lens, characterized in that: It includes a disc-shaped lens body, the outer side of the lens body is a convex arc surface, the inner side is a concave arc surface, the lens body is surrounded by cylindrical convex eaves, and the back inner side of the lens body is provided with a lens texture layer, and the lens texture layer is composed of 17 Fresnel patterns.

2. The Fresnel disk lens according to claim 1, characterized in that: The top of the convex eaves around the lens body is provided with an eave that is bent 180° outward, and the outer edge of the eaves is provided with two positioning protrusions. The eaves and the positioning protrusions are in the same plane, and the angle between the plane and the vertical plane is 15°, which is used to make the lens body tilt downward 15°.

3. The Fresnel disk lens according to claim 2, characterized in that: The detection angle of the lens texture layer is 120° and the detection distance is 10 meters.

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

5. The Fresnel disk lens according to claim 4, characterized in that: The thickness of the middle portion of the lens body is 0.60±0.1 mm, and the thickness of the edge is 0.6±0.05 mm.

6. The Fresnel disk lens according to claim 1, characterized in that: The lens body, the convex eaves and the side eaves are integrally formed.

7. The Fresnel disk lens according to any one of claims 1 to 6, characterized in that: The 17 Fresnel patterns are divided into the first row of focusing areas, the second row of focusing areas and the third row of focusing areas from top to bottom. The first row of focusing areas and the second row of focusing areas are each arranged in sequence of seven focusing areas from left to right, and the third row of focusing areas is each arranged in sequence of three focusing areas from left to right; the three rows of focusing areas are symmetrically distributed along the central axis of the lens pattern layer.

8. The Fresnel disk lens according to claim 7, characterized in that: The areas of the seven light-focusing regions in the first row of light-focusing regions are all larger than the areas of the seven light-focusing regions in the second row of light-focusing regions and the areas of the three light-focusing regions in the third row of light-focusing regions.

9. The Fresnel disk lens according to claim 8, characterized in that: The 17 Fresnel patterns are respectively a first light-concentrating area, a second light-concentrating area, a third light-concentrating area, a fourth light-concentrating area, a fifth light-concentrating area, a sixth light-concentrating area, a seventh light-concentrating area, an eighth light-concentrating area, a ninth light-concentrating area, and a tenth light-concentrating area; the fourth light-concentrating area, the eighth light-concentrating area, and the tenth light-concentrating area are arranged in the middle of the lens pattern layer; the first light-concentrating area, the second light-concentrating area, the third light-concentrating area, the fifth light-concentrating area, the sixth light-concentrating area, the seventh light-concentrating area, and the ninth light-concentrating area are each provided in pairs; the two first light-concentrating areas, the second light-concentrating areas, and the third light-concentrating areas are symmetrically arranged on both sides of the fourth light-concentrating area; the two fifth light-concentrating areas, the sixth light-concentrating areas, and the seventh light-concentrating areas are symmetrically arranged on both sides of the eighth light-concentrating area; and the two ninth light-concentrating areas are symmetrically arranged on both sides of the tenth light-concentrating area; The fourth focusing area and the two first focusing areas, the second focusing area, and the third focusing area are the first row of focusing areas; the eighth focusing area and the two fifth focusing areas, the sixth focusing area, and the seventh focusing area are the second row of focusing areas; the tenth focusing area and the two ninth focusing areas are the third row of focusing areas.

10. The Fresnel disk lens according to claim 9, characterized in that: The width of the first focusing area is 2.01±0.5mm and the height is 8.20±0.5mm; the width of the second focusing area is 2.7±0.5mm and the height is 10.51±0.5mm; the width of the third focusing area is 2.85±0.5mm and the height is 11.54±0.5mm; the width of the fourth focusing area is 3.4±0.5mm and the height is 12.71±0.5mm; the width of the fifth focusing area is 2.68±0.5mm and the height is 4.4±0. 5mm; the width of the sixth focusing area is 2.2±0.5mm, and the height is 3.88±0.5mm; the width of the seventh focusing area is 2.35±0.5mm, and the height is 3.88±0.5mm; the width of the eighth focusing area is 3.4±0.5mm, and the height is 2.88±0.5mm; the width of the ninth focusing area is 4.55±0.5mm, and the height is 2.78±0.5mm; the width of the tenth focusing area is 3.4±0.5mm, and the height is 2.95±0.5mm.

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