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DE-102021133603-B4 - Four-part optical lens with large aperture

DE102021133603B4DE 102021133603 B4DE102021133603 B4DE 102021133603B4DE-102021133603-B4

Abstract

A four-part optical lens with a large aperture, comprising a first lens (10) with a positive light focus, a second lens (20) with a negative light focus, a third lens (30) with a positive light focus, and a fourth lens (40) with a positive light focus, arranged sequentially, characterized in that the two surfaces of the first lens (10) are each an S1 surface (11) and an S2 surface (12), wherein the two surfaces of the second lens (20) are each an S3 surface (21) and an S4 surface (22), wherein the two surfaces of the third lens (30) are each an S5 surface (31) and an S6 surface (32), wherein the two surfaces of the fourth lens (40) are each an S7 surface (41) and an S8 surface (42), wherein the S1 surface (11), the S2 surface (12), the S3 surface (21), S4 surface (22), S5 surface (31), S6 surface (32), S7 surface (41) and S8 surface (42) are arranged sequentially, wherein the side of S8 surface (42) facing away from S7 surface (41) is provided with an S9 surface (50), wherein an aperture diaphragm (60) is arranged on one side of S1 surface (11) or between S2 surface (12) and S3 surface (21), wherein S7 surface (41) is provided with a vignetting diaphragm (70), wherein S1 surface (11), S2 surface (12), S5 surface (31), S6 surface (32) and the S7 surface (41) are convex surfaces, while S4 surface (22) is a concave surface. where the distance between the aperture stop (60) and the object focus of the lens is |ST - F obj |, where the equivalent focal length of the lens is f 0 , |ST - F obj | < 0.7f 0 , where the free aperture d of the S1 surface (11) to the S8 surface (42) satisfies the following relationship: d i > 0.9d j , i < j, where i takes on an integer from 1 to 7 and j takes on an integer from 2 to 8, wherein the radius of curvature of the S3 surface (21) is r 3 , wherein the radius of curvature of the S4 surface (22) is r 4 , |r 4 | < |r 3 |, wherein the radius of curvature of the S7 surface (41) is r 7 , wherein the radius of curvature of the S8 surface (42) is r 8 , |r 7 | < |r 8 |, wherein the equivalent focal length of the fourth lens (40) is greater than the equivalent focal length of the third lens (30), wherein the equivalent focal length of the fourth lens (40) is greater than the equivalent focal length of the first lens (10), where the center-to-center distance between the S6 surface (32) and the S7 surface (41) is G 67 , where the center-to-center distance between the S2 surface (12) and the S3 surface (21) is G 23 , G 67 < G 23 .

Inventors

  • Cheng Jiang
  • Jun She
  • Jixue Nan

Assignees

  • YEJIA OPTICAL TECHNOLOGY (GUANGDONG) CORPORATION

Dates

Publication Date
20260513
Application Date
20211217
Priority Date
20210118

Claims (7)

  1. A four-part optical lens with a large aperture, comprising a first lens (10) with a positive light focus, a second lens (20) with a negative light focus, a third lens (30) with a positive light focus, and a fourth lens (40) with a positive light focus, arranged one after the other, characterized in that the two surfaces of the first lens (10) are each an S1 surface (11) and an S2 surface (12), wherein the two surfaces of the second lens (20) are each an S3 surface (21) and an S4 surface (22), wherein the two surfaces of the third lens (30) are each an S5 surface (31) and an S6 surface (32), wherein the two surfaces of the fourth lens (40) are each an S7 surface (41) and an S8 surface (42), wherein the S1 surface (11), the S2 surface (12), The S3 surface (21), the S4 surface (22), the S5 surface (31), the S6 surface (32), the S7 surface (41) and the S8 surface (42) are arranged sequentially, wherein the side of the S8 surface (42) facing away from the S7 surface (41) is provided with an S9 surface (50), wherein an aperture diaphragm (60) is arranged on one side of the S1 surface (11) or between the S2 surface (12) and the S3 surface (21), and wherein the S7 surface (41) is provided with a vignetting diaphragm (70). hen is, where the S1 surface (11), the S2 surface (12), the S5 surface (31), the S6 surface (32) and the S7 surface (41) are convex surfaces, where the S4 surface (22) is a concave surface, where the distance between the aperture diaphragm (60) and the object focus of the lens is |ST - F obj |, where the equivalent focal length of the lens is f 0 , |ST - F obj | < 0.7f 0 , where the free aperture d of the S1 surface (11) to the S8 surface (42) satisfies the following relationship: d i > 0.9d j , i < j, where i takes on an integer from 1 to 7 and j takes on an integer from 2 to 8, where the radius of curvature of the S3 surface (21) is r 3 , where the radius of curvature of the S4 surface (22) is r 4 , |r 4 | < |r 3 |, where the radius of curvature of the S7 surface (41) is r 7 , where the radius of curvature of the S8 surface (42) is r 8 , |r 7 | < |r 8 |, wherein the equivalent focal length of the fourth lens (40) is greater than the equivalent focal length of the third lens (30), wherein the equivalent focal length of the fourth lens (40) is greater than the equivalent focal length of the first lens (10), wherein the center distance between the S6 surface (32) and the S7 surface (41) is G 67 , wherein the center distance between the S2 surface (12) and the S3 surface (21) is G 23 , G 67 < G 23 .
  2. Four-part optical lens with large aperture according to Claim 1 , characterized in that the rear intersection point of the lens is larger than 2 mm.
  3. Four-part optical lens with large aperture according to Claim 1 , characterized in that the S8 surface (42) is a flat surface or a concave surface.
  4. Four-part optical lens with large aperture according to Claim 1 , characterized in that the S1 surface (11), the S2 surface (12), the S3 surface (21), the S4 surface (22), the S5 surface (31), the S6 surface (32), the S7 surface (41) and the S8 surface (42) are spherical or aspherical.
  5. Four-part optical lens with large aperture according to Claim 1 , characterized in that the first lens (10), the second lens (20), the third lens (30) and the fourth lens (40) are single lenses or adhesive lenses.
  6. Four-part optical lens with large aperture according to Claim 1 , characterized in that the first lens (10), the second lens (20), the third lens (30) and the fourth lens (40) are glass lenses or plastic lenses.
  7. Four-part optical lens with large aperture according to Claim 1 , characterized in that the Abbe number of the first lens (10) is Vd 1 , wherein the Abbe number of the second lens (20) is Vd 2 , wherein the Abbe number of the third lens (30) is Vd 3 , wherein the Abbe number of the fourth lens (40) is Vd 4 , Vd 1 - Vd 2 > 25, Vd 3 - Vd 2 > 25, Vd 4 - Vd 2 > 25.

Description

Technical field The present invention relates to the technical field of optical lenses, in particular to a four-part optical lens with a large aperture. State of the art In conventional technology, the vehicle headlight lens consists of a light source, a light energy collecting element, a light-dark boundary line structure and a convex lens, based on the projection principle. The newly developed pixel headlights are also called matrix headlights. They utilize digital light projection technology, allowing the vehicle headlights to not only provide illumination but also project patterns onto the ground, such as weather conditions, road navigation information, or other symbols that can be identified by people outside the vehicle. The optical system of the pixel headlight primarily comprises luminescent pixels (e.g., mini-LEDs, microLEDs, LCD screens, LCOS, or illuminated DMD digital micromirrors) and optical projection lenses. For the projection pattern to be clearly visible, the lens must achieve high optical performance: various optical aberrations, such as chromatic aberrations, field curvature, and astigmatism, are eliminated. State-of-the-art optical lenses must combine multiple positive and negative lenses in a suitable manner to eliminate aberrations. The number of lenses used depends on the lens parameters, performance indicators, and the optical materials and processes employed. More complex optical lenses may contain more than 10 lenses. Currently, optical lenses used in mobile phones typically contain more than 6 lenses, and their cost is high. The image quality of the three-part Cook lens using conventional technology can hardly meet the requirements. 1 This shows a classic four-element, three-set Tessar lens. The lens evolved from the three-element Cook lens; that is, the final set of monoconvex lenses is a double-bonded lens. The Tessar lens produces sharp images and corrects well for a wide range of aberrations. However, the numerical aperture of the original design is small, generally only about 0.125 and no more than 0.2, which means that the light energy utilization rate is extremely low, the lens arrangement requires very precise adjustments, the tolerance rate is small, and the usage requirements are high. Therefore, the four-element, double-Gauss lens also suffers from the aforementioned problems. Pixel headlights fulfill both illumination and imaging functions: On the one hand, higher energy efficiency and brightness are required; on the other hand, the projected image places specific demands on image quality, particularly low chromatic aberration. Furthermore, due to the specific characteristics of automotive applications, optical lenses must exhibit higher thermal reliability, improved vibration resistance, and reduced weight to further enhance market competitiveness while simultaneously demanding lower costs. State-of-the-art optical lenses cannot simultaneously meet performance requirements such as high energy utilization rate, high image quality, simple and stable structure, and low cost. US 20030161051 A1 Disclosing a single-focus lens, the lens consists of four lens components arranged from the object side in the order of positive, negative, positive, and relatively weak positive or negative refractive power, with an aperture positioned between the first and second lens components. The third lens component has a convex surface on its image side, and the fourth lens component has a meniscus shape, at least one aspherical surface, and is concave on its image side. The second lens component consists of a single lens element. Content of the present invention To solve the problems of the prior art, the present invention provides a four-part optical lens with a large aperture. The four-part optical lens has a high energy utilization rate, high image quality, a simple and stable structure, and low production and operating costs. A four-part optical lens with a large aperture according to the present invention, comprising a first lens with a positive light focus, a second lens with a negative light focus, a third lens with a positive light focus, and a fourth lens with a positive light focus, arranged one after the other, wherein the two surfaces of the first lens are each an S1 surface and an S2 surface, wherein the two surfaces of the second lens are each an S3 surface and an S4 surface, wherein the two surfaces of the third lens are each an S5 surface and an S6 surface, wherein the two surfaces of the fourth lens are each an S7 surface and an S8 surface, wherein the S1 surface, the S2 surface, the S3 surface, the S4 surface, the S5 surface, the S6 surface, the S7 surface, and the S8 surface are arranged one after the other, wherein the side facing away from the S7 surface of the S8 surface is provided with an S9 surface, wherein an aperture diaphragm is arranged on one side of the S1 surface or between the S2 surface and the S3 surface, wherein the S7 surface is provided with a vignetti