Fog-penetrating camera lens and manufacturing method thereof

Abstract

The invention discloses a fog-penetrating camera lens and a manufacturing method, and relates to the technical field of optical imaging. The first lens group is arranged on the inner wall of the mounting shell; the second lens group is arranged on the inner wall of the mounting shell and is positioned behind the first lens group; the third lens group is arranged on the inner wall of the mounting shell and is positioned behind the second lens group; and the fourth lens group is arranged on the inner wall of the mounting shell and is positioned behind the third lens group. The optical design of the fog-penetrating camera has the beneficial effects that through innovative lens combination, material selection and parameter optimization, the problem that an existing fog-penetrating camera optical system cannot realize simple structure and controllable cost to effectively cope with adverse effects of severe weather on imaging while ensuring high-definition imaging is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and in particular to a fog-penetrating camera lens and a manufacturing method thereof. Background Art

[0002] In many key fields, such as security monitoring, traffic management, remote sensing detection and military reconnaissance, clear and accurate image acquisition plays a vital role. However, severe weather conditions, especially fog and sandstorms, often pose a severe challenge to the imaging quality of cameras, resulting in blurred images, loss of details, reduced brightness and contrast, and color distortion, which seriously restricts the performance of applications based on visual information.

[0003] Taking foggy days as an example, tiny water droplets and dust particles in the atmosphere have significant scattering and absorption effects on light. The scattering effect causes light to deviate from its original path during propagation, resulting in blurred images; while the absorption effect causes the overall image brightness to decrease, contrast to weaken, and color to distort. In the field of security monitoring, ordinary cameras find it difficult to capture key safety details under foggy conditions, affecting early warning and prevention effects; in traffic monitoring, image quality issues lead to inaccurate traffic flow monitoring and difficulty in vehicle identification, increasing the difficulty of traffic command and the risk of accidents; in the field of remote sensing mapping, the poor quality of image data in severe weather directly affects the accurate analysis of surface features and geographic information.

[0004] Although there are technologies and products for imaging in foggy weather, the existing optical systems of fog-penetrating cameras still have many shortcomings. Some fog-penetrating cameras fail to fully consider the complex scattering and absorption characteristics of fog on light of different wavelengths, resulting in unsatisfactory imaging effects. The image still has a hazy feeling due to the fog. At the same time, in order to pursue high resolution and better fog-penetrating performance, some fog-penetrating cameras use complex lens structures, which not only makes the equipment bulky and heavy, which is not conducive to installation and flexible use, but also greatly increases the manufacturing cost, limiting its large-scale promotion. In addition, the complex lens structure is also prone to cause aberration problems such as chromatic aberration, spherical aberration, coma, and astigmatism, further reducing the image quality. Summary of the invention

[0005] In view of the above-mentioned prior art problems, the present invention is proposed.

[0006] The purpose of the present invention is to provide a fog-penetrating camera lens, which aims to solve the problem that the existing fog-penetrating camera optical system cannot achieve a simple structure and controllable cost while ensuring high-definition imaging, so as to effectively cope with the adverse effects of bad weather on imaging.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a fog-penetrating camera lens, comprising a mounting shell;

[0008] A fog-penetrating camera lens, comprising a mounting shell;

[0009] The first lens group, preferably a meniscus convex lens with a convex surface facing the object side, is arranged on the inner wall of the mounting shell;

[0010] The second lens group includes a concave lens and a convex lens disposed on the inner wall of the mounting shell and is located behind the first lens group;

[0011] A third lens group, comprising a positive lens and a negative lens arranged on the inner wall of the mounting shell, and located behind the second lens group (2);

[0012] The fourth lens group, preferably a filter, is arranged on the inner wall of the mounting shell and is located behind the third lens group;

[0013] The interval ratio among the first lens group, the second lens group, the third lens group and the fourth lens group is 4:5:2.

[0014] As a preferred solution of the fog-penetrating camera lens of the present invention, the number of the concave lenses and the number of the convex lenses are both two groups.

[0015] As a preferred solution of the fog-penetrating camera lens of the present invention, the number of the negative lenses is two.

[0016] As a preferred solution of the fog-penetrating camera lens of the present invention, the meniscus convex lens is made of a specific optical glass material.

[0017] As a preferred solution of the fog-penetrating camera lens of the present invention, the spectral characteristics of the filter are made according to the spectral characteristics of fog.

[0018] As a preferred solution of the fog-penetrating camera lens of the present invention, the focal length f1 of the meniscus convex lens is 16-22 mm, and the thickness d1 is 3-8 mm.

[0019] As a preferred solution of the fog-penetrating camera lens of the present invention, the focal length f2 of the concave lens (21) and the convex lens (22) is ≈50 mm, and the thickness D2 is 5-7 mm.

[0020] As a preferred solution of the fog-penetrating camera lens of the present invention, wherein: the focal length of the positive lens and the negative lens is f3 = 70 to 135 mm, and the thickness D3 is 6 to 11 mm.

[0021] As a preferred solution of the fog-penetrating camera lens of the present invention, the thickness of the filter is 1.0 mm to 1.5 mm.

[0022] A method for manufacturing a fog-penetrating camera lens comprises the following steps:

[0023] S1, making a meniscus convex lens, a concave lens, a convex lens, a positive lens, a negative lens, and a filter;

[0024] S2. Strictly control the air spacing and coaxiality between lenses for assembly, and use professional equipment for calibration and testing;

[0025] S3. After assembly, perform optical performance tests, including MTF test, aberration test and fog penetration test, and fine-tune lens parameters to optimize performance based on the test results;

[0026] S4, matching and connecting the optical system with the image sensor, adjusting the focal length, aperture size, color calibration and gain adjustment;

[0027] S5. Conduct long-term testing and verification in the actual environment, and further optimize and improve based on the results.

[0028] The beneficial effects of the fog-penetrating camera lens of the present invention are as follows: the optical design of the fog-penetrating camera of the present invention effectively solves the problem that the existing fog-penetrating camera optical system cannot achieve a simple structure and controllable cost while ensuring high-definition imaging, so as to effectively cope with the adverse effects of bad weather on imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Reference Figure 1 , is an embodiment of the present invention, which provides a fog-penetrating camera lens, including a mounting shell;

[0035] A first lens group 1 is arranged on the inner wall of the mounting shell;

[0036] Specifically, the first lens group 1 is a meniscus convex lens with the convex surface facing the object side, with a focal length of f1=16-22 mm and a thickness of d1=3-8 mm. It is made of a specific optical glass material and is used to collect light and preliminarily suppress fog scattered light.

[0037] It should be noted that the relative aperture of the meniscus convex lens meets a specific range to ensure effective light collection in foggy days.

[0038] The second lens group 2 is arranged on the inner wall of the mounting shell and is located behind the first lens group 1;

[0039] Specifically, the second lens group 2 includes a concave lens 21 and a convex lens 22 arranged on the inner wall of the mounting shell. The number of the concave lens 21 and the convex lens 22 are both two groups, and there is a precisely calculated air gap between the two to correct aberrations and optimize fog penetration performance.

[0040] It should be noted that the concave lens 21 and the convex lens 22 have a focal length f2≈50 mm and a thickness D2=5-7 mm, and the curvature and thickness parameters are optimized to achieve the best optical coordination with the first lens group 1 and the third lens group 3.

[0041] The third lens group 3 is arranged on the inner wall of the mounting shell and is located behind the second lens group 2;

[0042] Specifically, the third lens group 3 includes a positive lens and a negative lens arranged on the inner wall of the mounting shell, and the number of negative lenses is two, which are used to finely correct various aberrations and suppress scattered light and focus reflected light based on the characteristics of fog.

[0043] It should be noted that the focal length of the positive lens and the negative lens is f3 = 70 ~ 135mm, the thickness is D3 = 6 ~ 11mm, and the material selection and curvature design of the cemented lens are based on the study of the light propagation characteristics in fog to achieve precise control of light of different wavelengths.

[0044] The fourth lens group 4 is arranged on the inner wall of the mounting shell and is located behind the third lens group 3;

[0045] Specifically, the fourth lens group 4 is a filter with a thickness of 1.0 mm to 1.5 mm, which is installed close to the image sensor. Its spectral characteristics are customized according to the spectral characteristics of fog and are used to enhance image contrast and clarity.

[0046] It should be noted that the spectral transmission range of the filter is precisely set to remove fog-interfering colored light and highlight the details of the target object.

[0047] Specifically, the interval ratio between the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 is 4:5:2.

[0048] In summary, through innovative lens combinations, material selection and parameter optimization, the problem that the existing optical system of fog-penetrating cameras cannot ensure high-definition imaging while achieving a simple structure and controllable costs to effectively cope with the adverse effects of bad weather on imaging has been effectively solved.

[0049] A method for manufacturing a fog-penetrating camera lens, characterized in that it comprises the following steps:

[0050] S1, making a meniscus convex lens, a concave lens 21, a convex lens 22, a positive lens, a negative lens, and a filter;

[0051] S2. Strictly control the air spacing and coaxiality between lenses for assembly, and use professional equipment for calibration and testing;

[0052] S3. After assembly, perform optical performance tests, including MTF test, aberration test and fog penetration test, and fine-tune lens parameters to optimize performance based on the test results;

[0053] S4, matching and connecting the optical system with the image sensor, adjusting the focal length, aperture size, color calibration and gain adjustment;

[0054] S5. Conduct long-term testing and verification in the actual environment, and further optimize and improve based on the results.

[0055] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fog-penetrating camera lens, characterized in that: include, Install the shell; The first lens group (1), preferably a meniscus convex lens with a convex surface facing the object side, is arranged on the inner wall of the mounting shell; The second lens group (2) comprises a concave lens (21) and a convex lens (22) arranged on the inner wall of the mounting shell, and is located behind the first lens group (1); A third lens group (3), comprising a positive lens and a negative lens arranged on the inner wall of the mounting shell, and located behind the second lens group (2); The fourth lens group (4), preferably a filter, is arranged on the inner wall of the mounting shell and is located behind the third lens group (3). The interval ratio between the first lens group (1), the second lens group (2), the third lens group (3) and the fourth lens group (4) is 4:5:

2.

2. The fog-penetrating camera lens according to claim 1, characterized in that: The number of the concave lenses (21) and the number of the convex lenses (22) are both two groups.

3. The fog-penetrating camera lens according to claim 1, characterized in that: The number of the negative lenses is two.

4. The fog-penetrating camera lens according to claim 1, wherein: The meniscus convex lens is made of a specific optical glass material.

5. The fog-penetrating camera lens according to claim 1, characterized in that: The spectral characteristics of the filter are made according to the spectral characteristics of fog.

6. The fog-penetrating camera lens according to claim 1, characterized in that: The focal length of the meniscus convex lens is f1=16-22 mm, and the thickness is d1=3-8 mm.

7. The fog-penetrating camera lens according to claim 1, characterized in that: The focal length f2 of the concave lens (21) and the convex lens (22) is 50 mm, and the thickness D2 is 5 to 7 mm.

8. The fog-penetrating camera lens as claimed in claim 1, characterized in that: Also includes, The positive lens and the negative lens have a focal length f3 of 70 to 135 mm and a thickness D3 of 6 to 11 mm.

9. The fog-penetrating camera lens according to claim 1, characterized in that: The thickness of the filter is 1.0 mm to 1.5 mm.

10. A method for manufacturing a fog-penetrating camera lens, characterized in that: The following steps are involved: S1, manufacturing a meniscus convex lens, a concave lens (21), a convex lens (22), a positive lens, a negative lens, and a filter; S2. Strictly control the air spacing and coaxiality between lenses for assembly, and use professional equipment for calibration and testing; S3. After assembly, perform optical performance tests, including MTF test, aberration test and fog penetration test, and fine-tune lens parameters to optimize performance based on the test results; S4, matching and connecting the optical system with the image sensor, adjusting the focal length, aperture size, color calibration and gain adjustment; S5. Conduct long-term testing and verification in the actual environment, and further optimize and improve based on the results.

Images