Fisheye doorbell lens
Through the design of fisheye doorbell lens, the combination of glass spherical lenses and plastic aspherical lenses and plastic frames are adopted, combined with sealing and optical design, the problem of insufficient performance of doorbell lenses in the existing technology is solved, and a large field of view angle and low Cost and waterproof lens.
Patent Information
- Application Number
- CN202323496242.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-19
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-19
AI Technical Summary
The existing doorbell lenses cannot fully meet the requirements of low cost, large field of view, large shooting range, few imaging noise at low illumination, clear imaging, small size, small weight and certain waterproof performance.
A fisheye doorbell lens was designed, using a lens group that includes a combination of glass spherical lenses with negative and positive power and plastic aspherical lenses, combined with threaded plastic frames and seals, using a mela sheet and a backing pad In order to reduce twilight, infrared cutoff filters are used to improve low illuminance performance.
It achieves low cost, large field of view angle, large shooting range, clear imaging at low illumination, small size, light weight, and certain waterproof performance, and is suitable for a wide range of application scenarios.
Smart Images
Figure CN222145312U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of doorbell lenses, in particular to a fisheye doorbell lens. Background Art
[0002] With the continuous development of the economy, people pay more and more attention to home security, among which the visual doorbell system technology has been widely used in society. Due to the usage scenario requirements of doorbell lenses, doorbell lenses must meet the requirements of low cost, large field of view, large shooting range, less imaging noise in low illumination, clear imaging, small size, light weight, and certain waterproof performance. However, existing doorbell lenses cannot fully meet the above requirements. Utility Model Content
[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a fisheye doorbell lens to solve the problems mentioned in the above background technology section.
[0004] The utility model is realized by the following technical solutions:
[0005] A fisheye doorbell lens comprises a lens frame, wherein a lens group is fixedly arranged inside the lens frame, wherein the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis; the first lens has a negative optical focal length, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has a negative optical focal length, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has a positive optical focal length, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has a positive optical focal length, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has a negative optical focal length, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has a positive optical focal length, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface.
[0006] Furthermore, the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspherical lenses.
[0007] Furthermore, the frame includes a frame body and a pressure ring that are threadedly connected, the inner circumference of the frame body forms a first step surface, the first step surface is provided with a groove, a sealing ring is fixed to the groove, and the first lens is clamped between the pressure ring and the sealing ring.
[0008] Furthermore, a second step surface is formed on the inner periphery of the frame body, the sixth lens abuts against the second step surface, and the second lens, the third lens, the fourth lens and the fifth lens are stacked on the sixth lens in sequence along the optical axis from the object side to the image side.
[0009] Furthermore, a first spacer is sandwiched between the second lens and the third lens; a second spacer is sandwiched between the third lens and the fourth lens; and a third spacer is sandwiched between the fifth lens and the sixth lens.
[0010] Furthermore, a first Mylar sheet is sandwiched between the second lens and the first spacer, a second Mylar sheet is sandwiched between the fourth lens and the fifth lens; a third Mylar sheet is sandwiched between the fifth lens and the third spacer; and a fourth Mylar sheet is sandwiched between the sixth lens and the second step surface.
[0011] Furthermore, a V-shaped groove is formed on the inner circumferential surface of the second spacer ring.
[0012] Furthermore, a backing adhesive gasket is provided between the first lens and the second lens.
[0013] Furthermore, the inner circumferential surface of the frame body is provided with a plurality of gear steps.
[0014] The beneficial effects of the utility model are as follows: a fisheye doorbell lens comprises a lens frame, a lens group is fixedly arranged inside the lens frame, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis; the first lens has a negative optical focal length, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has a negative optical focal length, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has a positive optical focal length, the object side surface of the third lens is a convex surface, and the third lens The image side surface of the fourth lens is convex; the fourth lens has positive optical power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has negative optical power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the sixth lens has positive optical power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex. Through the above structure, the fisheye doorbell lens of the utility model has the advantages of low cost, large field of view, large shooting range, less imaging noise at low illumination, ensuring clear imaging, small size, light weight, and certain waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a three-dimensional diagram of the utility model.
[0016] Figure 2 It is a cross-sectional view of the lens assembly of the utility model.
[0017] Figure 3 It is a central cross-sectional view of the utility model.
[0018] Figure 4 It is a center cross-sectional view of the frame body of the utility model.
[0019] The above drawings include the following reference numerals:
[0020] 1. Lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 15. Fifth lens; 16. Sixth lens; 2. Frame body; 21. First step surface; 211. Groove; 212. Sealing ring; 22. Second step surface; 23. Shift step; 3. Pressing ring; 41. First spacer; 42. Second spacer; 421. V-shaped groove; 43. Third spacer; 51. First Mylar pad; 52. Second Mylar pad; 53. Third Mylar pad; 54. Fourth Mylar pad; 61. Adhesive gasket. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the utility model.
[0022] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.
[0023] Reference Figures 1 to 4As shown, a fisheye doorbell lens includes a lens frame, a lens group 1 is fixed inside the lens frame, and the lens group 1 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15 and a sixth lens 16 arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens 11 has negative optical power, the object side surface of the first lens 11 is convex, and the image side surface of the first lens 11 is concave; the second lens 12 has negative optical power, the object side surface of the second lens 12 is concave, and the image side surface of the second lens 12 is concave; the third lens 13 has positive optical power, the object side surface of the third lens 13 is convex, and the image side surface of the third lens 13 is convex; the fourth lens 14 has positive optical power, the object side surface of the fourth lens 14 is convex, and the image side surface of the fourth lens 14 is convex; the fifth lens 15 has negative optical power, the object side surface of the fifth lens 15 is concave, and the image side surface of the fifth lens 15 is convex; the sixth lens 16 has positive optical power, the object side surface of the sixth lens 16 is convex, and the image side surface of the sixth lens 16 is convex.
[0024] The first lens 11 and the third lens 13 are glass spherical lenses, and the second lens 12, the fourth lens 14, the fifth lens 15 and the sixth lens 16 are plastic aspherical lenses. Different from the traditional all-glass lens, the combination of two glass spherical lenses and four plastic aspherical lenses has the advantages of lighter weight and lower cost, and achieves large light transmission and large imaging surface while maintaining a large field of view.
[0025] The spectacles frame comprises a frame body 2 and a pressing ring 3 which are threadedly connected. Both the frame body 2 and the pressing ring 3 are made of plastic. Different from a spectacles frame made of metal, a spectacles frame made of plastic greatly reduces the weight of the product.
[0026] The inner periphery of the frame body 2 forms a first step surface 21, and the first step surface 21 is provided with a groove 211. The groove 211 is fixed with a sealing ring 212. The first lens 11 is sandwiched between the pressure ring 3 and the sealing ring 212. The sealing ring 212 is made of rubber material, with a cross-sectional diameter of 0.8 mm and a center diameter of φ9.2 mm. The groove depth of the groove 211 (such as Figure 4 The A dimension is 0.4 mm, and the groove width of the groove 211 (such as Figure 4 The B dimension is 1 mm. Under this groove 211 structure, the theoretical compression rate of the sealing ring 212 is 25%, and the filling rate is 83.7%, thereby ensuring the sealing of the doorbell lens and making the doorbell lens have a certain waterproof performance. The pressing ring 3 includes but is not limited to using aluminum support. The metal pressing ring 3 has a high structural strength and is not easy to deform. After being assembled in place, it can effectively control the degree of surface deviation of the first lens 11.
[0027] A second step surface 22 is formed on the inner periphery of the frame body 2, and the sixth lens 16 abuts against the second step surface 22. The second lens 12, the third lens 13, the fourth lens 14 and the fifth lens 15 are stacked on the sixth lens 16 in sequence along the optical axis from the object side to the image side.
[0028] A first spacer 41 is sandwiched between the second lens 12 and the third lens 13; a second spacer 42 is sandwiched between the third lens 13 and the fourth lens 14, and a third spacer 43 is sandwiched between the fifth lens 15 and the sixth lens 16. A V-shaped groove 421 is formed on the inner circumference of the second spacer 42, wherein the first spacer 41, the second spacer 42 and the third spacer 43 include but are not limited to being made of aluminum material, one end of the second spacer 42 abuts against the inner circumference of the frame body 2, and the other end extends toward the central optical axis direction to block stray light between the third lens 13 and the fourth lens 14, and the V-shaped groove 421 is used to prevent the inner circumference plane of the second spacer 42 from reflecting stray light or ghost images on the doorbell lens.
[0029] A first Mylar sheet 51 is sandwiched between the second lens 12 and the first spacer 41, a second Mylar sheet 52 is sandwiched between the fourth lens 14 and the fifth lens 15, a third Mylar sheet 53 is sandwiched between the fifth lens 15 and the third spacer 43, and a fourth Mylar sheet 54 is sandwiched between the sixth lens 16 and the second step surface 22. The first Mylar sheet 51, the second Mylar sheet 52, the third Mylar sheet 53 and the fourth Mylar sheet 54 are all used to intercept stray light.
[0030] An adhesive backing gasket 61 is provided between the first lens 11 and the second lens 12. Specifically, in the optical design, the gap between the first lens 11 and the second lens 12 is small, and a spacer ring cannot be used for support. Moreover, due to the influence of the sealing ring 212, when the Mylar sheet is used, the position of the Mylar sheet cannot be limited. Therefore, the adhesive backing gasket 61 is attached to the support position of the object side of the second lens 12 to avoid direct contact between the first lens 11 and the second lens 12, and the adhesive backing gasket 61 can block stray light.
[0031] The inner circumferential surface of the frame body 2 is provided with a plurality of gear steps 23, and the number of the gear steps 23 is set to four. If there are too many gear steps 23, the frame body 2 needs to be processed with multiple step gradients during processing, which is more cumbersome. If there are too few gear steps 23, the diameter of a single gear step 23 is too long during processing, and the offset of the turning tool during processing will cause the lens group 1 to be unable to adapt to the frame body 2, thereby increasing the processing accuracy requirements of the frame body 2 and improving the processing difficulty.
[0032] The rear end of the frame body 2 is provided with an external thread, which is connected to a support (not shown in the figure) through the external thread. An ICR (not shown in the figure) is sandwiched between the support and the frame body 2. The ICR is a special filter. When the light is sufficient during the day, the infrared cut-off filter works, and the image sensor restores the true color. When the light is insufficient at night, the infrared cut-off filter automatically moves away, and the full-spectrum optical glass starts to work, so that the image sensor can make full use of all the light, thereby greatly improving the low-light performance. ICR belongs to the prior art.
[0033] The doorbell lens of the present invention has the following advantages: first, the optical structure of the doorbell lens is composed of 2 glass lenses and 4 plastic lenses. Compared with the all-glass lens structure on the market, the lens cost is lower; second, the doorbell lens has a large image surface, the maximum image surface is φ4.6mm, and the horizontal / vertical field of view is 155°, the diagonal field of view is 180°, and the shooting range is large; third, the doorbell lens has a large light transmittance, F2.08, and the image is clear even in low illumination; fourth, the doorbell lens is small in size and light in weight, and the size does not exceed φ16.5mm; fifth, the doorbell lens has a large image surface, the maximum image surface is φ4.6mm; sixth, the doorbell lens is waterproof and has a night vision function, and has a wide range of application scenarios.
[0034] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A fisheye doorbell lens, characterized in that: The invention comprises a lens frame, wherein a lens group (1) is fixedly arranged inside the lens frame, wherein the lens group (1) comprises a first lens (11), a second lens (12), a third lens (13), a fourth lens (14), a fifth lens (15) and a sixth lens (16) arranged in sequence from the object side to the image side along the optical axis; The first lens (11) has negative optical power, the object side surface of the first lens (11) is a convex surface, and the image side surface of the first lens (11) is a concave surface; The second lens (12) has negative optical power, the object side surface of the second lens (12) is a concave surface, and the image side surface of the second lens (12) is a concave surface; The third lens (13) has positive focal power, the object side surface of the third lens (13) is a convex surface, and the image side surface of the third lens (13) is a convex surface; The fourth lens (14) has positive refractive power, the object side surface of the fourth lens (14) is a convex surface, and the image side surface of the fourth lens (14) is a convex surface; The fifth lens (15) has negative optical power, the object side surface of the fifth lens (15) is a concave surface, and the image side surface of the fifth lens (15) is a convex surface; The sixth lens (16) has positive refractive power, the object side surface of the sixth lens (16) is a convex surface, and the image side surface of the sixth lens (16) is a convex surface.
2. The fisheye doorbell lens according to claim 1, characterized in that: The first lens (11) and the third lens (13) are glass spherical lenses, and the second lens (12), the fourth lens (14), the fifth lens (15) and the sixth lens (16) are plastic aspherical lenses.
3. A fisheye doorbell lens according to claim 1 or 2, characterized in that: The eyeglass frame comprises a frame body (2) and a pressure ring (3) connected by threads, the inner periphery of the frame body (2) forms a first step surface (21), the first step surface (21) is provided with a groove (211), a sealing ring (212) is fixedly provided in the groove (211), and the first lens (11) is sandwiched between the pressure ring (3) and the sealing ring (212).
4. The fisheye doorbell lens according to claim 3, characterized in that: A second step surface (22) is formed on the inner periphery of the frame body (2), the sixth lens (16) abuts against the second step surface (22), and the second lens (12), the third lens (13), the fourth lens (14) and the fifth lens (15) are stacked on the sixth lens (16) in sequence along the optical axis from the object side to the image side.
5. The fisheye doorbell lens according to claim 4, characterized in that: A first spacer (41) is sandwiched between the second lens (12) and the third lens (13); a second spacer (42) is sandwiched between the third lens (13) and the fourth lens (14); and a third spacer (43) is sandwiched between the fifth lens (15) and the sixth lens (16).
6. The fisheye doorbell lens according to claim 5, characterized in that: A first Mylar sheet (51) is sandwiched between the second lens (12) and the first spacer (41); a second Mylar sheet (52) is sandwiched between the fourth lens (14) and the fifth lens (15); a third Mylar sheet (53) is sandwiched between the fifth lens (15) and the third spacer (43); and a fourth Mylar sheet (54) is sandwiched between the sixth lens (16) and the second step surface (22).
7. The fisheye doorbell lens according to claim 5, characterized in that: A V-shaped groove (421) is formed on the inner circumferential surface of the second spacer (42).
8. The fisheye doorbell lens according to claim 5, characterized in that: A backing adhesive gasket (61) is provided between the first lens (11) and the second lens (12).
9. The fisheye doorbell lens according to claim 3, characterized in that: The inner circumferential surface of the frame body (2) is provided with a plurality of gear steps (23).