An optical lens capable of 4K ultra-high definition imaging

Abstract

The application relates to a 4K ultra-high-definition imaging optical lens, an optical system of the lens comprising a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along an incident light path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a double-convex positive lens, the fourth lens is a double-convex positive lens, the fifth lens is a meniscus negative lens, the sixth lens is a double-convex positive lens, and the seventh lens is a meniscus negative lens; while ensuring that the imaging quality of the optical system can reach 4K definition, the shortcomings of the optical system in relative aperture, total length, field angle and the like are overcome, the number of lenses is reduced, the system size is shortened, the cost rate is improved, the comprehensive cost of the system is reduced, and a field angle of greater than 120 DEG meets the requirements of most 4K optical lens use scenes.

Description

Technical Field

[0001] This invention relates to the field of lens technology, and in particular to an optical lens capable of 4K ultra-high-definition imaging. Background Technology

[0002] As the applications of optical lenses become increasingly widespread, including security monitoring, automotive lenses, drones, robots, and smart home appliances, coupled with continuous advancements and innovations in related manufacturing technologies, the global annual demand for optical lenses is steadily increasing. Resolution is a key performance indicator of optical lenses and the most important standard for measuring their quality. 4K ultra-high-definition optical lenses offer higher resolution than ordinary lenses, revealing richer details in scenes. However, this higher resolution standard also means that it is more difficult to maintain other optical lens specifications, including relative aperture, overall length, and field of view. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an optical lens capable of 4K ultra-high-definition imaging, which overcomes its shortcomings in terms of relative aperture, total length, and field of view while achieving 4K ultra-high-definition imaging.

[0004] The present invention is achieved by the following scheme: an optical lens capable of 4K ultra-high-definition imaging, wherein the optical system of the lens includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the incident light path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a biconvex positive lens, the fourth lens is a biconvex positive lens, the fifth lens is a meniscus negative lens, the sixth lens is a biconvex positive lens, and the seventh lens is a meniscus negative lens.

[0005] Furthermore, the focal length ƒ of the optical system, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens are ƒ1, ƒ2, ƒ3, ƒ4, ƒ5, ƒ6, and ƒ7, respectively, wherein ƒ1, ƒ2, ƒ3, ƒ4, ƒ5, ƒ6, and ƒ7 satisfy the following ratios with ƒ: 1.0 < |ƒ1 / ƒ| < 3.0, 8.0 < |ƒ2 / ƒ| < 10.0, 2.0 < |ƒ3 / ƒ| < 4.0, 2.0 < |ƒ4 / ƒ| < 4.0, 1.0 < |ƒ5 / ƒ| < 3.0, 1.0 < |ƒ6 / ƒ| < 3.0, 18.0 < ƒ7 / ƒ| < 20.0.

[0006] Furthermore, the first lens satisfies the following relationship: N d ≥1.5, V d ≥50.0; The second lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The third lens satisfies the following relationship: Nd ≥1.5, V d ≤50.0; The fourth lens satisfies the following relationship: N d ≤1.5, V d ≥50.0; The fifth lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The sixth lens satisfies the following relationship: N d ≥1.5, V d ≥50.0; The seventh lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0007] Furthermore, the second, third, and seventh lenses are aspherical lenses, and the equation for the aspherical curve is expressed as follows:

[0008] ,

[0009] Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of h; c is the paraxial curvature of the aspherical surface; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0010] Furthermore, the total optical length TTL of the optical system and the focal length ƒ of the optical system satisfy the following condition: TTL / ƒ≤8.0.

[0011] Furthermore, the F-number of the optical system is ≤1.3.

[0012] Furthermore, the image height H of the optical system and the focal length ƒ of the optical system satisfy the following relationship: H / ƒ≥2.0; the refractive index of the first lens... .

[0013] Furthermore, the refractive index temperature coefficients of the fourth and sixth lenses... .

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The optical lens for 4K ultra-high-definition imaging provided by the present invention uses seven optical lenses. By molding aspherical lenses, the aberration is better corrected. While ensuring that the imaging quality of the optical system can reach 4K resolution, the number of lenses is reduced, thereby shortening the system size, increasing the cost ratio, and reducing the overall cost of the system.

[0016] (2) The first lens is a high-refractive-index glass spherical lens, which reduces the size of the head while improving the wear resistance of the lens.

[0017] (3) Through reasonable optimization, the incident angle of light on each refracting surface is smaller, effectively controlling the sensitivity of various tolerances, reducing the difficulty of system assembly, improving the lens production yield, and reducing production costs.

[0018] (4) Both the spherical and aspherical lenses of the optical system are made of glass. While ensuring image quality, they have good light transmittance. With a large relative aperture, they can adapt to different lighting conditions.

[0019] (5) Based on the effect of the temperature coefficient of refractive index, the temperature coefficient of refractive index of the fifth and sixth lenses of the system is negative. At the same time, considering the temperature compensation characteristics of the lens base, the lens defocus is small and has good environmental stability in the range of -40℃ to 80℃.

[0020] (6) A field of view greater than 120° meets the requirements of most 4K optical lens usage scenarios.

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the optical system according to an embodiment of the present invention;

[0023] Figure 2 This is an axial chromatic aberration diagram of the optical system across the entire operating band according to an embodiment of the present invention;

[0024] Figure 3 This is a transverse chromatic aberration diagram of the optical system across the entire operating band according to an embodiment of the present invention;

[0025] Figure 4 This is a field curvature distortion diagram of the optical system across all operating wavelengths according to an embodiment of the present invention;

[0026] Figure 5 This is a defocusing curve of the optical system of this invention at a low temperature of -40°C in the visible light band;

[0027] Figure 6 This is a defocusing curve of the optical system of this invention at room temperature (25°C) in the visible light band;

[0028] Figure 7 This is a defocusing curve of the optical system of this invention at a high temperature of 80°C in the visible light band;

[0029] Explanation of the labels in the diagram: L1 - First lens; L2 - Second lens; L3 - Third lens; STO - Aperture stop; L4 - Fourth lens; L5 - Fifth lens; L6 - Sixth lens; L7 - Seventh lens; L8 - Equivalent glass plate; IMA - Imaging plane. Detailed Implementation

[0030] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] like Figures 1-7 As shown, an optical lens capable of 4K ultra-high-definition imaging is disclosed. The optical system of the lens includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the incident light path. Ignoring curvature caused by aspherical coefficients, the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a biconvex positive lens, the fourth lens is a biconvex positive lens, the fifth lens is a meniscus negative lens, the sixth lens is a biconvex positive lens, and the seventh lens is a meniscus negative lens. All lenses are made of glass, wherein the first, fourth, fifth, and sixth lenses are spherical glass lenses, and the second, third, and seventh lenses are aspherical glass lenses.

[0033] like Figures 2 to 4 As shown, by using appropriate lens combinations, various aberrations in the system are effectively optimized, thus improving image quality; for example... Figures 5 to 7 As shown, the optical lens has a small defocus amount at -40℃ and 80℃, which effectively ensures the imaging quality at high and low temperatures.

[0034] In this embodiment, the aperture stop of the optical system is located between the third lens and the fourth lens; a filter-equivalent glass plate is provided on the rear side of the seventh lens.

[0035] In this embodiment, the focal length ƒ of the optical system, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens are ƒ1, ƒ2, ƒ3, ƒ4, ƒ5, ƒ6, ƒ7, respectively. The ratios of ƒ1, ƒ2, ƒ3, ƒ4, ƒ5, ƒ6, ƒ7 to ƒ satisfy the following ratios: 1.0 < |ƒ1 / ƒ| < 3.0, 8.0 < |ƒ2 / ƒ| < 10.0, 2.0 < |ƒ3 / ƒ| < 4.0, 2.0 < |ƒ4 / ƒ| < 4.0, 1.0 < |ƒ5 / ƒ| < 3.0, 1.0 < |ƒ6 / ƒ| < 3.0, 18.0 < ƒ7 / ƒ| < 20.0.

[0036] In this embodiment, the first lens satisfies the following relationship: N d ≥1.5, V d ≥50.0; The second lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The third lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The fourth lens satisfies the following relationship: N d ≤1.5, V d ≥50.0; The fifth lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The sixth lens satisfies the following relationship: N d ≥1.5, V d ≥50.0; The seventh lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0037] In this embodiment, the second lens, the third lens, and the seventh lens are aspherical lenses. The equation for the aspherical curve is:

[0038] ,

[0039] Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of h; c is the paraxial curvature of the aspherical surface; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0040] In this embodiment, the total optical length TTL of the optical system and the focal length ƒ of the optical system satisfy the following condition: TTL / ƒ≤8.0.

[0041] In this embodiment, the F-number of the optical system is ≤1.3.

[0042] In this embodiment, the image height H of the optical system and the focal length ƒ of the optical system satisfy the following condition: H / ƒ≥2.0; the refractive index of the first lens... .

[0043] In this embodiment, the refractive index temperature coefficients of the fourth and sixth lenses are... .

[0044] The technical specifications achieved by the optical system in this embodiment are as follows:

[0045] (1) Focal length: 3.0≤EFFL≤5.0mm; (2) Aperture F≤1.3; (3) Field of view: 2w≥120°; (4) Working band: visible light band.

[0046] To achieve the above design parameters, the specific parameter design of the optical system in this embodiment is shown in the table below (where the radius of curvature corresponding to the aspherical lens is the central radius of curvature):

[0047]

[0048] The aspherical coefficients of the aspherical lenses in the optical system of this embodiment are shown in the table below:

[0049]

[0050] The optical system in this embodiment achieves a small overall length, large angle, small F number, and thermal design, while also providing good correction for on-axis and off-axis aberrations, enabling the system to achieve 4K image quality.

[0051] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0052] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0053] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0054] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An optical lens capable of 4K ultra-high-definition imaging, characterized in that: The optical system of the lens includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the incident light path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the third lens is a biconvex positive lens, the fourth lens is a biconvex positive lens, the fifth lens is a meniscus negative lens, the sixth lens is a biconvex positive lens, and the seventh lens is a meniscus negative lens; the focal length ƒ of the optical system is... The focal lengths of the sixth and seventh lenses are ƒ1, ƒ2, ƒ3, ƒ4 and ƒ5, ƒ6, ƒ7, respectively. Among them, ƒ1, ƒ2, ƒ3, ƒ4 and ƒ5, ƒ6, ƒ7 satisfy the following ratios with ƒ: 1.0 < |ƒ1 / ƒ| < 3.0, 8.0 < |ƒ2 / ƒ| < 10.0, 2.0 < |ƒ3 / ƒ| < 4.0, 2.0 < |ƒ4 / ƒ| < 4.0, 1.0 < |ƒ5 / ƒ| < 3.0, 1.0 < |ƒ6 / ƒ| < 3.0, 18.0 < |ƒ7 / ƒ| < 20.

0.

2. The optical lens capable of 4K ultra-high-definition imaging according to claim 1, characterized in that: The first lens satisfies the following relationship: N d ≥1.5, V d ≥50.0; The second lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The third lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The fourth lens satisfies the following relationship: N d ≤1.5, V d ≥50.0; The fifth lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; The sixth lens satisfies the following relationship: N d ≥1.5, V d ≥50.0; The seventh lens satisfies the following relationship: N d ≥1.5, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

3. The optical lens capable of 4K ultra-high-definition imaging according to claim 1, characterized in that: The second, third, and seventh lenses are aspherical lenses, and the equation for their aspherical curves is as follows: ， Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of r; c is the paraxial curvature of the aspherical surface; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

4. The optical lens capable of 4K ultra-high-definition imaging according to claim 1, characterized in that: The total optical length (TTL) of the optical system and the focal length (ƒ) of the optical system satisfy the following condition: TTL / ƒ≤8.

0.

5. The optical lens capable of 4K ultra-high-definition imaging according to claim 1, characterized in that: The F-number of the optical system is ≤1.

3.

6. The optical lens capable of 4K ultra-high-definition imaging according to claim 1, characterized in that: The image height H of the optical system and the focal length ƒ of the optical system satisfy the following relationship: H / ƒ≥2.0; the refractive index of the first lens... .

7. The optical lens capable of 4K ultra-high-definition imaging according to claim 1, characterized in that: Temperature coefficient of refractive index of the fourth and sixth lenses .

Images