A spherical fresnel lens
Patent Information
- Application Number
- CN202522605372.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-12-09
AI Technical Summary
[0004]本实用新型的目的是提供一种球面菲涅尔镜片，旨在解决现有菲涅尔镜片侦测距离较近、宠物进入其侦测范围会触发误报警的技术问题
[0015]采用上述技术方案所产生的有益效果在于：与现有技术相比，本实用新型通过在镜片主体的背面设置由40片菲涅尔纹路组合而成的透镜纹路层，同时多层结构的透镜纹路层为两边对称设计，并通过控制镜片的电度阙值，宠物进入侦测范围后，不会触发误报警。本实用新型能够在透镜有限范围内，侦测角度达到90度，侦测范围为前方11米远；带有弧度的镜片能够符合远距离的侦测要求，近距离防宠物的应用要求，装配方便。
Smart Images
Figure CN224840546U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of Fresnel lens technology, and specifically relates to a spherical Fresnel lens. Background Technology
[0002] As is well known, Fresnel lenses are essential accessories for smart home products such as cameras and webcams to display their functions. Their function is to collect infrared light emitted by the human body and then focus the infrared light onto the sensor surface. In conjunction with smart security alarms, smart cameras, webcams and other smart home products, they can detect the infrared light emitted when a person moves, thereby activating and capturing images or triggering an alarm.
[0003] Currently, the lenses used in existing cameras have a relatively short detection range, so a new type of lens needs to be developed to meet application requirements. Summary of the Invention
[0004] The purpose of this invention is to provide a spherical Fresnel lens, which aims to solve the technical problem that existing Fresnel lenses have a short detection distance and will trigger false alarms when pets enter their detection range.
[0005] To address the above problems, this invention provides a spherical Fresnel lens.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A spherical Fresnel lens includes a disc-shaped lens body. The lens body is a spherical crown-shaped structure with a concave back and a convex outer arc. The back of the lens body has a multi-layered lens texture layer, composed of 40 Fresnel patterns symmetrically distributed along the central axis of the lens body. The upper Fresnel patterns are used for long-distance detection, and the lower Fresnel patterns are used for short-distance detection. This lens design, under appropriate threshold control of the sensor and circuitry, will not detect the movement of a pet.
[0007] Preferably, the detection angle of the lens body is 90 degrees and the detection distance is 11 meters.
[0008] Preferably, the lens body can tilt downwards by 15-20 degrees.
[0009] Preferably, the 40 Fresnel patterns are arranged from top to bottom as a first row of focusing areas, a second row of focusing areas, a third row of focusing areas, and a fourth row of focusing areas. The first row of focusing areas is located above the middle of the lens body, while the second, third, and fourth rows of focusing areas are located in the lower middle of the lens body. The first and second rows of focusing areas are adjacent to each other vertically, while the second, third, and fourth rows of focusing areas are spaced apart from each other from top to bottom. Through the optimized optical pattern direction, the optimized size of the focusing areas, and the deliberately optimized blank areas, the movement of the pet can be prevented from being detected after the threshold of the sensor and circuit is appropriately controlled.
[0010] The middle part of the first row of focusing areas is the sixth focusing area, and the two sides are symmetrical, with the first focusing area, the second focusing area, the third focusing area, the fourth focusing area, and the fifth focusing area on each side from the outside to the inside. The middle part of the second row of focusing areas is the twelfth focusing area. The two sides are symmetrical, and each side is arranged from the outside to the inside as the seventh, eighth, ninth, tenth, and eleventh focusing areas. The first, second, third, fourth, and fifth focusing areas are respectively located above the seventh, eighth, ninth, tenth, and eleventh focusing areas. The middle part of the third row of focusing areas is the eighteenth focusing area, and the outermost part of the third row of focusing areas is the thirteenth focusing area. The top of the thirteenth focusing area abuts against the seventh focusing area, and the inner side abuts against the fourteenth focusing area. The bottom of the thirteenth focusing area is flush with the bottom of the third row of focusing areas. The two sides of the eighteenth focusing area are symmetrical, and each side is divided into the seventeenth, sixteenth, fifteenth, and fourteenth focusing areas from the inside to the outside. The middle part of the fourth row of focusing areas is the twenty-second focusing area, and the two sides are symmetrical, with the nineteenth focusing area, the twentieth focusing area, and the twenty-first focusing area on each side from the outside to the inside.
[0011] Preferably, the width of the first focusing area is 4.15±0.5mm and the height is 10.59±0.5mm; the width of the second focusing area is 3.5±0.5mm and the height is 10.59±0.5mm; the width of the third focusing area is 3.5±0.5mm and the height is 10.59±0.5mm; the width of the fourth focusing area is 3.5±0.5mm and the height is 10.59±0.5mm; the width of the fifth focusing area is 3.2±0.5mm and the height is 10.59±0.5mm; and the width of the sixth focusing area is 3.0±0.5mm and the height is 10.59±0.5mm. The width of the seventh focusing area is 4.12±0.5mm and the height is 3.5±0.5mm; the width of the eighth focusing area is 3.5±0.5mm and the height is 3.5±0.5mm; the width of the ninth focusing area is 3.5±0.5mm and the height is 3.5±0.5mm; the width of the tenth focusing area is 3.5±0.5mm and the height is 3.5±0.5mm; the width of the eleventh focusing area is 3.2±0.5mm and the height is 3.5±0.5mm; the width of the twelfth focusing area is 3.2±0.5mm and the height is 3.5±0.5mm. The thirteenth focusing area has a width of 4.31±0.5mm and a height of 3.49±0.5mm; the fourteenth focusing area has a width of 3.5±0.5mm and a height of 1.89±0.5mm; the fifteenth focusing area has a width of 3.5±0.5mm and a height of 1.89±0.5mm; the sixteenth focusing area has a width of 3.0±0.5mm and a height of 1.89±0.5mm; the seventeenth focusing area has a width of 3.0±0.5mm and a height of 1.89±0.5mm; and the eighteenth focusing area has a width of 3.0±0.5mm and a height of 1.89±0.5mm. The width of the nineteenth focusing area is 3.0±0.5mm and the height is 1.89±0.5mm; the width of the twentieth focusing area is 4.0±0.5mm and the height is 3.48±0.5mm; the width of the twenty-first focusing area is 3.2±0.5mm and the height is 3.48±0.5mm; and the width of the twenty-second focusing area is 3.0±0.5mm and the height is 3.48±0.5mm.
[0012] Furthermore, the thickness of the lens body is 0.5-0.8mm, and the dimensional tolerance of the lens body is ±1mm.
[0013] Furthermore, the lens body has a raised edge around its four edges, and the four raised edges are in the same plane; the four edges of the raised edge are provided with four positioning grooves at intervals, and the positioning grooves are used to cooperate with the product to be installed.
[0014] Furthermore, the edge of the eaves has two positioning lugs, which are respectively located at the bottom and side of the eaves, and the middle of the positioning lugs has a mounting hole; the positioning lugs and the mounting hole are used to assemble with the product to be installed.
[0015] The beneficial effects of adopting the above technical solution are as follows: Compared with the prior art, this utility model, by setting a lens texture layer composed of 40 Fresnel patterns on the back of the lens body, and with the multi-layered lens texture layer being symmetrically designed on both sides, and by controlling the electrical threshold of the lens, will not trigger a false alarm when a pet enters the detection range. This utility model can achieve a detection angle of 90 degrees within the limited range of the lens, with a detection range of 11 meters in front; the curved lens can meet the requirements of long-distance detection and close-range pet prevention applications, and is easy to assemble. Attached Figure Description
[0016] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.
[0017] In the attached diagram: Figure 1 An external view of a spherical Fresnel lens provided for an embodiment of this utility model; Figure 2 This is a front view of the spherical Fresnel lens in an embodiment of this utility model; Figure 3 for Figure 2 Right view of a mid-spherical Fresnel lens; Figure 4 for Figure 3 Right view of a mid-spherical Fresnel lens; In the figure: lens body 100, convex rim 101, positioning groove 102, positioning lug 103, mounting hole 104; lens texture layer 200; First spotlight zone 1, second spotlight zone 2, third spotlight zone 3, fourth spotlight zone 4, fifth spotlight zone 5, sixth spotlight zone 6, seventh spotlight zone 7, eighth spotlight zone 8, ninth spotlight zone 9, tenth spotlight zone 10, eleventh spotlight zone 11, twelfth spotlight zone 12, thirteenth spotlight zone 13, fourteenth spotlight zone 14, fifteenth spotlight zone 15, sixteenth spotlight zone 16, seventeenth spotlight zone 17, eighteenth spotlight zone 18, nineteenth spotlight zone 19, twentieth spotlight zone 20, twenty-first spotlight zone 21, twenty-second spotlight zone 22. Detailed Implementation
[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. In the following detailed description of the present utility model, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can fully understand the present utility model.
[0019] Furthermore, those skilled in the art should understand that the accompanying drawings are provided only to illustrate the purpose, features, and advantages of this utility model, and are not actually drawn to scale.
[0020] Furthermore, unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to."
[0021] like Figures 1-4 As shown in the figure, an embodiment of the present invention provides a spherical Fresnel lens, including a disc-shaped lens body 100. The lens body 100 is a spherical crown-shaped structure with a concave back and a convex arc surface on the outer side. The back of the lens body 100 is provided with a multi-layered lens texture layer 200, which consists of 40 Fresnel patterns symmetrically distributed along the central axis of the lens body 100. The 40 Fresnel patterns are divided into a first-row focusing area, a second-row focusing area, a third-row focusing area, and a fourth-row focusing area from top to bottom. The first row of focusing areas is located above the center of the lens 100, while the second, third, and fourth rows are located in the lower middle part of the lens body 100. The first and second rows of focusing areas are adjacent vertically, while the second, third, and fourth rows are spaced apart from top to bottom. The Fresnel pattern in the upper first row of focusing areas is used for long-distance detection, while the Fresnel pattern in the lower second, third, and fourth rows is used for short-distance detection but will not detect pet movement. During installation, the lens body 100 is tilted downwards by 15-20 degrees, suitable for smart sensor applications. Lenses with this structure can detect objects up to 11 meters away with a detection angle of 90 degrees. They also have a pet-proof function; even if a pet enters the detection range, by appropriately controlling the sensor and circuit thresholds, the movement of a low-energy pet will not be detected, preventing false triggering of the product.
[0022] In specific design, such as Figure 4As shown, the middle of the first row of focusing areas is the sixth focusing area 6, and the two sides are symmetrical, with the first focusing area 1, the second focusing area 2, the third focusing area 3, the fourth focusing area 4, and the fifth focusing area 5 arranged sequentially from the outside to the inside on each side; the middle of the second row of focusing areas is the twelfth focusing area 12, and the two sides are symmetrical, with the seventh focusing area 7, the eighth focusing area 8, the ninth focusing area 9, the tenth focusing area 10, and the eleventh focusing area 11 arranged sequentially from the outside to the inside on each side; the first focusing area 1, the second focusing area 2, the third focusing area 3, the fourth focusing area 4, and the fifth focusing area 5 are respectively arranged above the seventh focusing area 7, the eighth focusing area 8, the ninth focusing area 9, the tenth focusing area 10, and the eleventh focusing area 11. The middle section of the third row of focusing areas is the eighteenth focusing area 18, and the outermost section of the third row of focusing areas is the thirteenth focusing area 13. The upper part of the thirteenth focusing area 13 abuts against the seventh focusing area 7, and the inner side abuts against the fourteenth focusing area 14. The bottom of the thirteenth focusing area 13 is flush with the bottom of the third row of focusing areas. The two sides of the eighteenth focusing area 18 are symmetrical, and from the inside to the outside on each side are the seventeenth focusing area 17, the sixteenth focusing area 16, the fifteenth focusing area 15, and the fourteenth focusing area 14. The middle section of the fourth row of focusing areas is the twenty-second focusing area 22, and the two sides are symmetrical, and from the outside to the inside on each side are the nineteenth focusing area 19, the twentieth focusing area 20, and the twenty-first focusing area 21. The specific dimensions of the four rows of focusing areas are as follows: The first focusing area 1 has a width of 4.15±0.5mm and a height of 10.59±0.5mm; the second focusing area 2 has a width of 3.5±0.5mm and a height of 10.59±0.5mm; the third focusing area 3 has a width of 3.5±0.5mm and a height of 10.59±0.5mm; the fourth focusing area 4 has a width of 3.5±0.5mm and a height of 10.59±0.5mm; the fifth focusing area 5 has a width of 3.2±0.5mm and a height of 10.59±0.5mm; and the sixth focusing area 6 has a width of 3.0±0.5mm and a height of 10.59±0.5mm. The seventh focusing area 7 has a width of 4.12±0.5mm and a height of 3.5±0.5mm; the eighth focusing area 8 has a width of 3.5±0.5mm and a height of 3.5±0.5mm; the ninth focusing area 9 has a width of 3.5±0.5mm and a height of 3.5±0.5mm; the tenth focusing area 10 has a width of 3.5±0.5mm and a height of 3.5±0.5mm; the eleventh focusing area 11 has a width of 3.2±0.5mm and a height of 3.5±0.5mm; and the twelfth focusing area 12 has a width of 3.2±0.5mm and a height of 3.5±0.5mm. The thirteenth focusing area 13 has a width of 4.31±0.5mm and a height of 3.49±0.5mm; the fourteenth focusing area 14 has a width of 3.5±0.5mm and a height of 1.89±0.5mm; the fifteenth focusing area 15 has a width of 3.5±0.5mm and a height of 1.89±0.5mm; the sixteenth focusing area 16 has a width of 3.0±0.5mm and a height of 1.89±0.5mm; the seventeenth focusing area 17 has a width of 3.0±0.5mm and a height of 1.89±0.5mm; and the eighteenth focusing area 18 has a width of 3.0±0.5mm and a height of 1.89±0.5mm. The width of the nineteenth focusing area 19 is 3.0±0.5mm and the height is 1.89±0.5mm; the width of the twentieth focusing area 20 is 4.0±0.5mm and the height is 3.48±0.5mm; the width of the twenty-first focusing area 21 is 3.2±0.5mm and the height is 3.48±0.5mm; and the width of the twenty-second focusing area 22 is 3.0±0.5mm and the height is 3.48±0.5mm.
[0023] The textured areas on both sides of the lens textured layer are large and divided into four layers. At the same time, the textured area of the first row of light-gathering areas at the top is large, which is conducive to absorbing energy at large angles and is suitable for detecting long distances. The textured area of the middle and lower light-gathering areas is smaller and divided into three rows at intervals, which is suitable for detecting short distances and can prevent false alarms from being triggered when pets with low energy enter the detection range.
[0024] In specific manufacturing, the thickness of the lens body 100 is 0.5-0.8mm, and the dimensional tolerance of the lens body 100 is ±1mm. The lens body is integrally molded during manufacturing, with a white glossy outer surface and a three-dimensional curved surface for a more aesthetically pleasing appearance.
[0025] In one specific embodiment of this utility model, such as Figure 1 As shown, the lens body 100 has a raised edge 101 around its perimeter, and the raised edges 101 are all in the same plane. Four concave, fixed-arc-shaped positioning grooves 102 are spaced apart around the perimeter of the raised edge 101, and positioning is achieved by utilizing the internal structure of the camera product in conjunction with the positioning grooves 102. Simultaneously, two positioning lugs 103 protrude from the edge of the raised edge 101, and the two positioning lugs 103 are respectively located at the bottom and side of the raised edge 101. The center of each positioning lug 103 has a mounting hole 104, and the shape of each positioning lug 103 is adapted to the product to be installed. The lens and product are assembled together through a connector passing through the mounting hole, ensuring a secure installation.
[0026] The working principle of this invention is as follows: A lens texture layer is formed by 40 Fresnel patterns symmetrically arranged on both sides. The first row of focusing areas and the texture areas on both sides are relatively large and divided into four layers, which is beneficial for absorbing energy at large angles. Within the limited range of the lens, this lens can achieve a detection angle of 90 degrees and a detection range of 11 meters in front, while not detecting pets. The lens can be installed on the corresponding product using positioning slots and mounting holes, and can be tilted downwards by 15-20 degrees for a wider detection field. The lens has a curved shape, which is more suitable for large-angle and long-distance detection ranges, and it matches the appearance of the customer's product for easy assembly. The lens surface has a white glossy finish. This invention is particularly suitable for the application scenarios of smart IP cameras.
[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A spherical Fresnel lens, characterized in that: The lens body includes a disc-shaped lens body, which is a spherical crown-shaped structure with a concave back and a convex arc surface on the outside. The back of the lens body is provided with a multi-layered lens texture layer, which consists of 40 Fresnel patterns and is symmetrically distributed along the central axis of the lens body. The upper Fresnel pattern is used to detect long distances, and the lower Fresnel pattern is used to detect short distances.
2. A spherical Fresnel lens according to claim 1, characterized in that: The detection angle of the lens body is 90 degrees, and the detection distance is 11 meters.
3. A spherical Fresnel lens according to claim 2, characterized in that: The lens body can tilt downwards by 15-20 degrees.
4. A spherical Fresnel lens according to claim 3, characterized in that: The 40 Fresnel patterns are divided into four condensing zones from top to bottom: a first condensing zone, a second condensing zone, a third condensing zone, and a fourth condensing zone. The first condensing zone is located above the middle of the lens body, while the second, third, and fourth condensing zones are located in the lower middle of the lens body. The first and second condensing zones are adjacent to each other vertically, while the second, third, and fourth condensing zones are spaced apart from top to bottom. The middle part of the first row of focusing areas is the sixth focusing area, and the two sides are symmetrical, with the first focusing area, the second focusing area, the third focusing area, the fourth focusing area, and the fifth focusing area on each side from the outside to the inside. The middle part of the second row of focusing areas is the twelfth focusing area. The two sides are symmetrical, and each side is arranged from the outside to the inside as the seventh, eighth, ninth, tenth, and eleventh focusing areas. The first, second, third, fourth, and fifth focusing areas are respectively located above the seventh, eighth, ninth, tenth, and eleventh focusing areas. The middle part of the third row of focusing areas is the eighteenth focusing area, and the outermost part of the third row of focusing areas is the thirteenth focusing area. The top of the thirteenth focusing area abuts against the seventh focusing area, and the inner side abuts against the fourteenth focusing area. The bottom of the thirteenth focusing area is flush with the bottom of the third row of focusing areas. The two sides of the eighteenth focusing area are symmetrical, and each side is divided into the seventeenth, sixteenth, fifteenth, and fourteenth focusing areas from the inside to the outside. The middle part of the fourth row of focusing areas is the twenty-second focusing area, and the two sides are symmetrical, with the nineteenth focusing area, the twentieth focusing area, and the twenty-first focusing area on each side from the outside to the inside.
5. A spherical Fresnel lens according to claim 4, characterized in that: The width of the first focusing area is 4.15±0.5mm and the height is 10.59±0.5mm; the width of the second focusing area is 3.5±0.5mm and the height is 10.59±0.5mm; the width of the third focusing area is 3.5±0.5mm and the height is 10.59±0.5mm; the width of the fourth focusing area is 3.5±0.5mm and the height is 10.59±0.5mm; the width of the fifth focusing area is 3.2±0.5mm and the height is 10.59±0.5mm; and the width of the sixth focusing area is 3.0±0.5mm and the height is 10.59±0.5mm. The width of the seventh focusing area is 4.12±0.5mm and the height is 3.5±0.5mm; the width of the eighth focusing area is 3.5±0.5mm and the height is 3.5±0.5mm; the width of the ninth focusing area is 3.5±0.5mm and the height is 3.5±0.5mm; the width of the tenth focusing area is 3.5±0.5mm and the height is 3.5±0.5mm; the width of the eleventh focusing area is 3.2±0.5mm and the height is 3.5±0.5mm; the width of the twelfth focusing area is 3.2±0.5mm and the height is 3.5±0.5mm. The thirteenth focusing area has a width of 4.31±0.5mm and a height of 3.49±0.5mm; the fourteenth focusing area has a width of 3.5±0.5mm and a height of 1.89±0.5mm; the fifteenth focusing area has a width of 3.5±0.5mm and a height of 1.89±0.5mm; the sixteenth focusing area has a width of 3.0±0.5mm and a height of 1.89±0.5mm; the seventeenth focusing area has a width of 3.0±0.5mm and a height of 1.89±0.5mm; and the eighteenth focusing area has a width of 3.0±0.5mm and a height of 1.89±0.5mm. The width of the nineteenth focusing area is 3.0±0.5mm and the height is 1.89±0.5mm; the width of the twentieth focusing area is 4.0±0.5mm and the height is 3.48±0.5mm; the width of the twenty-first focusing area is 3.2±0.5mm and the height is 3.48±0.5mm; and the width of the twenty-second focusing area is 3.0±0.5mm and the height is 3.48±0.5mm.
6. A spherical Fresnel lens according to claim 5, characterized in that: The thickness of the lens body is 0.5-0.8mm, and the dimensional tolerance of the lens body is ±1mm.
7. A spherical Fresnel lens according to claim 6, characterized in that: The lens body has a raised edge around its four sides, and the four raised edges are in the same plane; the four edges of the raised edge are provided with four positioning grooves at intervals.
8. A spherical Fresnel lens according to claim 7, characterized in that: The edge of the eaves has two positioning lugs, which are respectively located at the bottom and side of the eaves, and the middle of the positioning lugs has a mounting hole.