Optical lens

Abstract

The present invention provides an optical lens, comprising: a lens barrel; a lens group, the lens group is arranged inside the lens barrel, wherein, the refractive indices of the first lens and the fourth lens are the same and less than 1.6; a support member group, the support member group is arranged inside the lens barrel, wherein, the effective focal length f of the optical lens, half of the maximum field angle of the optical lens Semi-FOV, the inner diameter d0m of the image-side end face of the lens barrel, the refractive index N1 of the first lens, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first support member in the extending direction of the optical axis, the maximum thickness CP1 of the first support member, the central thickness CT1 of the first lens, the interval distance EP23 from the second support member to the third support member in the extending direction of the optical axis, the maximum thickness CP3 of the third support member, the curvature radius R7 of the object-side surface of the fourth lens, and the curvature radius R8 of the image-side surface of the fourth lens satisfy: 0.4 < N1 / EP01 < 2.0; 0.2 < f*tan(Semi-FOV) / d0m < 1.8; 0 < CP1 / CT1 < 1.5; -0.1 < (EP23 + CP3) / (R7 + R8) < 1.6. The present invention solves the problems that the lenses at both ends of the optical lens in the prior art are difficult to form and have high sensitivity.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical lens. Background Technology

[0002] With the development of virtual reality, users' demands for head-mounted devices are gradually increasing, and these devices are also evolving towards smaller size and lighter weight. This has led to the miniaturization of the optical lenses mounted on these devices. In some cases, head-mounted devices need to perceive their surroundings for precise positioning, requiring optical lenses with a sufficiently large field of view and clear imaging. Improving both the field of view and image quality while simultaneously meeting miniaturization requirements results in limited design freedom and difficulty in manufacturing lenses. For the lenses located at both ends of the optical lens, which control the incident and emitted light, playing a crucial role in overall image quality and field of view, their design freedom is even smaller, and manufacturing is even more challenging.

[0003] In other words, the lenses at both ends of the optical lens in the existing technology have the problems of being difficult to form and having high sensitivity. Summary of the Invention

[0004] The main objective of this invention is to provide an optical lens to solve the problems of high molding difficulty and high sensitivity of the lenses at both ends of the optical lens in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an optical lens is provided, comprising: a lens barrel; a lens group disposed within the lens barrel, wherein the lens group is composed of a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side, wherein the first lens and the fourth lens have the same refractive index and are less than 1.6; and a support assembly disposed within the lens barrel, comprising a first support member, a second support member, and a third support member, wherein the first support member is located on the image side of the first lens and at least partially contacts the image side surface of the first lens, the second support member is located on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third support member is located on the image side of the third lens and at least partially contacts the image side surface of the third lens; the optical lens satisfies:

[0006] 0.4 <N1 / EP01<2.0;

[0007] 0.2 <f*tan(Semi-FOV) / d0m<1.8;

[0008] 0 <CP1 / CT1<1.5;

[0009] -0.1<(EP23+CP3) / (R7+R8)<1.6;

[0010] Where f is the effective focal length of the optical lens, Semi-FOV is half of the maximum field of view of the optical lens, d0m is the inner diameter of the image-side end face of the lens barrel, N1 is the refractive index of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first support member in the direction of optical axis extension, CP1 is the maximum thickness of the first support member, CT1 is the center thickness of the first lens, EP23 is the interval distance between the second and third support members in the direction of optical axis extension, CP3 is the maximum thickness of the third support member, R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens.

[0011] According to another aspect of the present invention, an optical lens is provided, comprising a lens barrel, a lens group, and a support group. The lens group is disposed within the lens barrel and consists of a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side, wherein the first lens and the fourth lens have the same refractive index and are less than 1.6. The support group is disposed within the lens barrel and includes a first support member, a second support member, and a third support member. The first support member is located on the image side of the first lens and at least partially contacts the image side of the first lens; the second support member is located on the image side of the second lens and at least partially contacts the image side of the second lens; the third support member is located on the image side of the third lens and at least partially contacts the image side of the third lens. The optical lens satisfies the following:

[0012] 0.4 <N1 / EP01<2.0;

[0013] 0.2 <f*tan(Semi-FOV) / d0m<1.8;

[0014] CP1 / T12+CP3 / T34<1.5, where CP1 is the maximum thickness of the first bearing component.

[0015] Among them, f is the effective focal length of the optical lens, Semi-FOV is half of the maximum field angle of the optical lens, d0m is the inner diameter of the image-side end face of the lens barrel, N1 is the refractive index of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first bearing member in the extension direction of the optical axis, CP1 is the maximum thickness of the first bearing member, T12 is the air gap between the first lens and the second lens on the optical axis, CP3 is the maximum thickness of the third bearing member, and T34 is the air gap between the third lens and the fourth lens on the optical axis. Since the first lens and the fourth lens in this application use materials with lower refractive indices, and 0.4 < N1 / EP01 < 2.0 is satisfied between N1 and EP01, and 0.2 < f*tan(Semi-FOV) / d0m < 1.8 is satisfied among f, Semi-FOV, and d0m, the optical lens can meet the performance of a wide angle. At the same time, the image height is matched with the inner diameter of the image-side end face of the lens barrel, so that the effective light passing through the fourth lens can better reach the imaging surface, ensuring the imaging quality. At the same time, it will cause certain difficulties in the molding of the first lens and the fourth lens. By further restricting the relationship between CP1, T12, CP3, and T34 in this application, the air gap between the lenses can be adjusted and the center thickness of adjacent lenses can be restricted on the premise of ensuring the miniaturization of the lens, reducing the lens sensitivity, facilitating the later field curvature adjustment of the lens, and obtaining the best lens performance.

[0016] Further, the optical lens satisfies: -0.8 < (d3s + d3m - d0m) / R7 < 0.1, where d3s is the inner diameter of the object-side surface of the third bearing member, d3m is the inner diameter of the image-side surface of the third bearing member, d0m is the inner diameter of the image-side end face of the lens barrel, and R7 is the curvature radius of the object-side surface of the fourth lens.

[0017] Further, the optical lens satisfies: 0 ≤ (EP12 - EP23) / (R4 + R5) < 6.0, where EP12 is the spacing distance between the first bearing member and the second bearing member in the extension direction of the optical axis, EP23 is the spacing distance between the second bearing member and the third bearing member in the extension direction of the optical axis, R4 is the curvature radius of the image-side surface of the second lens, and R5 is the curvature radius of the object-side surface of the third lens.

[0018] Further, the optical lens satisfies: CP1 / T12 + CP3 / T34 < 1.5, where CP1 is the maximum thickness of the first bearing member, T12 is the air gap between the first lens and the second lens on the optical axis, CP3 is the maximum thickness of the third bearing member, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0019] Further, the optical lens satisfies: 0 < EP01 / (R1 - R2) < 1.5, where EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first bearing member in the extending direction of the optical axis, R1 is the curvature radius of the object-side surface of the first lens, and R2 is the curvature radius of the image-side surface of the first lens.

[0020] Further, the curvature radius of the object-side surface of the fourth lens is less than zero, and the optical lens satisfies: -0.3 < D0m / (R7 + R8) < 6.5, where D0m is the outer diameter of the image-side end face of the lens barrel, R7 is the curvature radius of the object-side surface of the fourth lens, and R8 is the curvature radius of the image-side surface of the fourth lens.

[0021] Further, the optical lens satisfies: 2.0 < L / f / (D0s / D0m) < 3.2, where L is the maximum height of the lens barrel, f is the effective focal length of the optical lens, D0s is the outer diameter of the object-side end face of the lens barrel, and D0m is the outer diameter of the image-side end face of the lens barrel.

[0022] Further, the optical lens satisfies: 0.5 < (d2s + d3s) / (f2 + f3) < 3.3, where d2s is the inner diameter of the object-side surface of the second bearing member, d3s is the inner diameter of the object-side surface of the third bearing member, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0023] Further, the optical lens satisfies: 0.9 < ∑AT / (CP1 + CP2 + CP3) < 5.5, where CP1 is the maximum thickness of the first bearing member, CP2 is the maximum thickness of the second bearing member, CP3 is the maximum thickness of the third bearing member, and ∑AT is the sum of the air gaps on the optical axis between all adjacent lenses in the optical lens.

[0024] Further, the optical lens satisfies: -10.8 < EP23 / CT2 + R4 / R3 < 2.6, where CT2 is the central thickness of the second lens, EP23 is the distance between the second bearing member and the third bearing member in the extending direction of the optical axis, R4 is the curvature radius of the image-side surface of the second lens, and R3 is the curvature radius of the object-side surface of the second lens.

[0025] Further, the optical lens satisfies: -0.3 < EP23 / R5 + CP3 / R6 < 0.8, where EP23 is the distance between the second bearing member and the third bearing member in the extending direction of the optical axis, R5 is the curvature radius of the object-side surface of the third lens, CP3 is the maximum thickness of the third bearing member, and R6 is the curvature radius of the image-side surface of the third lens.

[0026] Further, the optical lens satisfies: 4.6 < f1 / (EP01 + CP1) < -2.5, where f1 is the effective focal length of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first bearing member in the extending direction of the optical axis, and CP1 is the maximum thickness of the first bearing member.

[0027] Further, the optical lens satisfies: -3.5 < (D3m - D1m) / (DT12 - DT41) < 1.0, where D3m is the outer diameter of the image-side surface of the third bearing member, D1m is the outer diameter of the image-side surface of the first bearing member, DT12 is the effective semi-aperture of the image-side surface of the first lens, and DT41 is the effective semi-aperture of the object-side surface of the fourth lens.

[0028] Further, the optical lens satisfies: 0.5 < CP2 / (|SAG22| + SAG31) < 2.0, where CP2 is the maximum thickness of the second bearing member, SAG22 is the distance on the optical axis between the intersection of the image-side surface of the second lens and the optical axis and the maximum effective semi-aperture of the image-side surface of the second lens, and SAG31 is the distance on the optical axis between the intersection of the object-side surface of the third lens and the optical axis and the maximum effective semi-aperture of the object-side surface of the third lens.

[0029] Further, the radius of curvature of the image-side surface of the first lens is the minimum value among the absolute values of the radii of curvature of all surfaces of the first lens and the fourth lens.

[0030] Applying the technical solution of the present invention, the optical lens includes a lens barrel, a lens group, and a bearing member group. The lens group is disposed within the lens barrel, and the lens group is sequentially composed of a first lens, a second lens, a third lens, and a fourth lens from the object side to the image side. Among them, the refractive indices of the first lens and the fourth lens are the same and less than 1.6; the bearing member group is disposed within the lens barrel, and the bearing member group includes a first bearing member, a second bearing member, and a third bearing member. Among them, the first bearing member is located on the image side of the first lens and at least partially contacts the image-side surface of the first lens, the second bearing member is located on the image side of the second lens and at least partially contacts the image-side surface of the second lens, and the third bearing member is located on the image side of the third lens and at least partially contacts the image-side surface of the third lens; the optical lens satisfies:

[0031] 0.4 < N1 / EP01 < 2.0;

[0032] 0.2 < f*tan(Semi-FOV) / d0m < 1.8;

[0033] [[ID=二十一]]0 < CP1 / CT1 < 1.5;

[0034] -0.1 < (EP23 + CP3) / (R7 + R8) < 1.6;

[0035] Among them, f is the effective focal length of the optical lens, Semi-FOV is half of the maximum field angle of the optical lens, d0m is the inner diameter of the image-side end face of the lens barrel, N1 is the refractive index of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first bearing member in the extending direction of the optical axis, CP1 is the maximum thickness of the first bearing member, CT1 is the central thickness of the first lens, EP23 is the interval distance between the second bearing member and the third bearing member in the extending direction of the optical axis, CP3 is the maximum thickness of the third bearing member, R7 is the curvature radius of the object-side surface of the fourth lens, and R8 is the curvature radius of the image-side surface of the fourth lens.

[0036] Since the first lens and the fourth lens in this application use materials with relatively low refractive indices, and 0.4 < N1 / EP01 < 2.0 is satisfied between N1 and EP01, and 0.2 < f*tan(Semi-FOV) / d0m < 1.8 is satisfied among f, Semi-FOV, and d0m, the optical lens can meet the performance of wide angle. At the same time, the image height is matched with the inner diameter of the image-side end face of the lens barrel, so that the effective light passing through the fourth lens can better reach the imaging surface, ensuring the imaging quality. Meanwhile, it will cause certain difficulties in the molding of the first lens and the fourth lens. By further restricting the relationship between CP1 and CT1 and the relationship among EP23, CP3, R7, and R8 in this application, the thickness of the optical structure area of the first lens is restricted. Furthermore, the ratio of the optical structure area to the central thickness of the first lens is limited within a reasonable range, so that the thickness ratio of the overall shape of the first lens is controlled. At the same time, the shape of the optical effective area and the optical structure area of the fourth lens can also be restricted, so that the shapes of the first lens and the fourth lens are easier to control and easier to process and mold. At the same time, the sensitivity of the center thickness of the first lens and the fourth lens is reduced. When adjusting the center thickness, the change of the MTF curve is small and the performance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0038] Figure 1 The structural schematic diagram of the optical lens of an optional embodiment of the present invention is shown;

[0039] Figure 2 The structural schematic diagram of the optical lens of Embodiment 1 of the present invention is shown;

[0040] Figures 3 to 5 The axial chromatic aberration curve, astigmatism curve, and longitudinal chromatic aberration curve of Embodiment 1 of the present invention are respectively shown;

[0041] Figure 6A schematic diagram of the optical lens structure according to Embodiment 2 of the present invention is shown;

[0042] Figure 7 A schematic diagram of the optical lens of Embodiment 3 of the present invention is shown;

[0043] Figure 8 A schematic diagram of the optical lens of Embodiment 4 of the present invention is shown;

[0044] Figures 9 to 11 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Embodiment 4 of the present invention are shown respectively.

[0045] Figure 12 A schematic diagram of the optical lens of Embodiment 5 of the present invention is shown;

[0046] Figure 13 A schematic diagram of the optical lens of Embodiment Six of the present invention is shown;

[0047] Figure 14 A schematic diagram of the optical lens of Embodiment 7 of the present invention is shown;

[0048] Figures 15 to 17 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Embodiment 7 of the present invention are shown respectively.

[0049] Figure 18 A schematic diagram of the structure of the optical lens of Embodiment 8 of the present invention is shown;

[0050] Figure 19 A schematic diagram of the optical lens of Embodiment 9 of the present invention is shown;

[0051] Figure 20 A schematic diagram of the field curvature sensitivity of each lens in the T direction in an optical lens according to an alternative embodiment of the present invention is shown.

[0052] Figure 21 This diagram illustrates the field curvature sensitivity of each lens in the T direction in an optical lens of the prior art.

[0053] Figure 22 This diagram illustrates the field curvature sensitivity of each lens in the T direction in an optical lens of another prior art.

[0054] The above figures include the following reference numerals:

[0055] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; P1, First support member; P1b, First auxiliary support member; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; P2, Second support member; P2b, Second auxiliary support member; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; P3, Third support member; P3b, Third auxiliary support member; P3c, Third auxiliary support member; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens. Detailed Implementation

[0056] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0057] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0058] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0059] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0060] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0061] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0062] To address the problems of difficult molding and high sensitivity of the lenses at both ends of existing optical lenses, this invention provides an optical lens.

[0063] First Implementation Method

[0064] like Figures 1 to 19 As shown, the optical lens includes a lens barrel, a lens group, and a support assembly. The lens group is disposed within the lens barrel and consists of a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side. The first and fourth lenses have the same refractive index, which is less than 1.6. The support assembly is disposed within the lens barrel and includes a first support member, a second support member, and a third support member. The first support member is located on the image side of the first lens and at least partially contacts the image side of the first lens; the second support member is located on the image side of the second lens and at least partially contacts the image side of the second lens; and the third support member is located on the image side of the third lens and at least partially contacts the image side of the third lens. The optical lens satisfies the following:

[0065] 0.4 <N1 / EP01<2.0;

[0066] 0.2 <f*tan(Semi-FOV) / d0m<1.8;

[0067] 0 <CP1 / CT1<1.5;

[0068] -0.1<(EP23+CP3) / (R7+R8)<1.6;

[0069] Where, f is the effective focal length of the optical lens, Semi-FOV is half of the maximum field angle of the optical lens, d0m is the inner diameter of the image-side end face of the lens barrel, N1 is the refractive index of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first bearing member in the extending direction of the optical axis, CP1 is the maximum thickness of the first bearing member, CT1 is the central thickness of the first lens, EP23 is the interval distance between the second bearing member and the third bearing member in the extending direction of the optical axis, CP3 is the maximum thickness of the third bearing member, R7 is the curvature radius of the object-side surface of the fourth lens, and R8 is the curvature radius of the image-side surface of the fourth lens.

[0070] Since the first lens and the fourth lens in this application use materials with relatively low refractive indices, and 0.4 < N1 / EP01 < 2.0 is satisfied between N1 and EP01, and 0.2 < f*tan(Semi-FOV) / d0m < 1.8 is satisfied among f, Semi-FOV, and d0m, the optical lens can meet the performance of wide-angle. At the same time, the image height is matched with the inner diameter of the image-side end face of the lens barrel, so that the effective light passing through the fourth lens can better reach the imaging surface, ensuring the imaging quality. Meanwhile, it will cause certain difficulties in the molding of the first lens and the fourth lens. By further restricting the relationship between CP1 and CT1 and the relationship among EP23, CP3, R7, and R8 in this application, the thickness of the optical structure region of the first lens is restricted, and then the ratio of the edge thickness to the central thickness at the optical structure region of the first lens is limited within a reasonable range, controlling the overall shape thickness ratio of the first lens. At the same time, the shapes of the optical effective region and the optical structure region of the fourth lens can also be restricted, making the shapes of the first lens and the fourth lens easier to control and easier to process and mold. At the same time, the mid-thickness sensitivity of the first lens and the fourth lens is reduced. When adjusting the mid-thickness, the change of the MTF curve is small and the performance is better.

[0071] In addition, Figure 20 shows the field curvature sensitivity in the T direction when CP1 / CT1 in the optical lens of the present invention is within the range of 0 to 1.5 and (EP23 + CP3) / (R7 + R8) is within the range of -0.1 to 1.6. Figure 21 shows the field curvature sensitivity in the T direction when CP1 / CT1 in the optical lens is greater than 1.5 and (EP23 + CP3) / (R7 + R8) is greater than 1.6. Figure 22 shows the field curvature sensitivity in the T direction when CP1 / CT1 is less than 0 and (EP23 + CP3) / (R7 + R) is less than -0.1. It can be seen from Figures 20 to 22 that when CP1 / CT1 is within the range of 0 to 1.5 and (EP23 + CP3) / (R7 + R8) is within the range of -0.1 to 1.6, the field curvature sensitivity of the first lens and the fourth lens is significantly reduced, effectively improving the imaging performance of the optical lens.

[0072] In this embodiment, the optical lens satisfies: -0.8 < (d3s + d3m - d0m) / R7 < 0.1, where d3s is the inner diameter of the object side surface of the third supporting member, d3m is the inner diameter of the image side surface of the third supporting member, d0m is the inner diameter of the image side end surface of the lens barrel, and R7 is the curvature radius of the object side surface of the fourth lens. By controlling (d3s + d3m - d0m) / R7 within a reasonable range, the third supporting member abuts against the edge of the chief ray, so as to ensure that the inner diameter of the third supporting member can block stray light, thereby improving the imaging quality. At the same time, the fourth lens can affect the size of the tail of the optical lens, avoid large misalignment of the abutting surface during assembly, and contribute to improving the assembly stability of the optical lens.

[0073] In this embodiment, the optical lens satisfies: 0 ≤ (EP12 - EP23) / (R4 + R5) < 6.0, where EP12 is the distance between the first supporting member and the second supporting member in the extending direction of the optical axis, EP23 is the distance between the second supporting member and the third supporting member in the extending direction of the optical axis, R4 is the curvature radius of the image side surface of the second lens, and R5 is the curvature radius of the object side surface of the third lens. By controlling (EP12 - EP23) / (R4 + R5) within a reasonable range, it helps to control the edge thickness and surface shape of the second lens and the third lens, reduce the forming difficulty of the second lens and the third lens, improve the processability of the lens, and further improve the forming yield rate of the lens, ensuring the processing quality of the second lens and the third lens.

[0074] In this embodiment, the optical lens satisfies: CP1 / T12 + CP3 / T34 < 1.5, where CP1 is the maximum thickness of the first supporting member, T12 is the air gap between the first lens and the second lens on the optical axis, CP3 is the maximum thickness of the third supporting member, and T34 is the air gap between the third lens and the fourth lens on the optical axis. By controlling CP1 / T12 + CP3 / T34 within a reasonable range, it is possible to adjust the air gap between the lenses and limit the center thickness of adjacent lenses on the premise of ensuring the miniaturization of the lens, reduce the lens sensitivity, facilitate the later field curvature adjustment of the lens, and obtain the best lens performance.

[0075] In this embodiment, the optical lens satisfies: 0 < EP01 / (R1 - R2) < 1.5, where EP01 is the distance between the object side end surface of the lens barrel and the object side surface of the first supporting member in the extending direction of the optical axis, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens. By controlling EP01 / (R1 - R2) within a reasonable range, it is possible to control the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens, which is beneficial to controlling the edge thickness and center thickness of the first lens, improving the uniformity of the lens thickness distribution, and improving the imaging quality while improving the assembly stability.

[0076] In this embodiment, the radius of curvature of the object side surface of the fourth lens is less than zero, and the optical lens satisfies: -0.3 < D0m / (R7 + R8) < 6.5, where D0m is the outer diameter of the image-side end surface of the lens barrel, R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. By controlling the relationship between the radii of curvature on both sides of the fourth lens and the outer diameter of the image-side end surface of the lens barrel, the bending degree of the object side surface and the image side surface of the fourth lens in the region near the optical axis can be controlled, which is beneficial to the light passing through this region to obtain good refraction, reduce the generation of stray light, and the reasonable setting of the outer diameter of the image-side end surface of the lens barrel can, while ensuring that the rear end of the lens barrel has sufficient wall thickness, the reasonable inner diameter of the lens barrel can block the excess light to a certain extent and improve the imaging quality.

[0077] In this embodiment, the optical lens satisfies: 2.0 < L / f / (D0s / D0m) < 3.2, where L is the maximum height of the lens barrel, f is the effective focal length of the optical lens, D0s is the outer diameter of the object-side end surface of the lens barrel, and D0m is the outer diameter of the image-side end surface of the lens barrel. By controlling L / f / (D0s / D0m) within a reasonable range, the outer diameter of the image-side end surface of the lens barrel and the outer diameter of the object-side end surface of the lens barrel can be made similar, which is beneficial to the molding of the lens barrel. At the same time, the maximum length of the lens barrel coordinates with the design of the incident light of the optical lens. To ensure that there is no obstruction to the incident light, the contact portion between the lens barrel and the first lens has sufficient thickness, and the stability of the optical lens assembly is improved.

[0078] In this embodiment, the optical lens satisfies: 0.5 < (d2s + d3s) / (f2 + f3) < 3.3, where d2s is the inner diameter of the object side surface of the second support member, d3s is the inner diameter of the object side surface of the third support member, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. By controlling (d2s + d3s) / (f2 + f3) within a reasonable range, the inner diameter of the object side surface of the second support member and the inner diameter of the object side surface of the third support member can be kept within a reasonable range, blocking the stray light that enters the third lens and the fourth lens due to light refraction, improving the imaging quality, and the curvature of the second lens and the position of the aperture can also be controlled to control the amount of light passing through and ensure the rationality of the light direction, thereby improving the imaging quality.

[0079] In this embodiment, the optical lens satisfies: 0.9 < ∑AT / (CP1 + CP2 + CP3) < 5.5, where CP1 is the maximum thickness of the first bearing member, CP2 is the maximum thickness of the second bearing member, CP3 is the maximum thickness of the third bearing member, and ∑AT is the sum of the air gaps on the optical axis between all adjacent lenses in the optical lens. By controlling ∑AT / (CP1 + CP2 + CP3) within a reasonable range, the maximum thicknesses of the first bearing member, the second bearing member, and the third bearing member can be effectively controlled, and at the same time, it is coordinated with the shapes of the object side and the image side of all lenses to reduce the molding difficulty of the lens, ensure the structural strength of the lens, and improve the assembly stability of the optical lens.

[0080] In this embodiment, the optical lens satisfies: -10.8 < EP23 / CT2 + R4 / R3 < 2.6, where CT2 is the central thickness of the second lens, EP23 is the spacing distance between the second bearing member and the third bearing member in the extension direction of the optical axis, R4 is the radius of curvature of the image side of the second lens, and R3 is the radius of curvature of the object side of the second lens. By controlling EP23 / CT2 + R4 / R3 within a reasonable range, the ratio of the edge thickness to the central thickness of the second lens can be effectively controlled, reducing the molding difficulty of the second lens, improving the assembly stability and imaging quality of the optical lens.

[0081] In this embodiment, the optical lens satisfies: -0.3 < EP23 / R5 + CP3 / R6 < 0.8, where EP23 is the spacing distance between the second bearing member and the third bearing member in the extension direction of the optical axis, R5 is the radius of curvature of the object side of the third lens, CP3 is the maximum thickness of the third bearing member, and R6 is the radius of curvature of the image side of the third lens. By controlling EP23 / R5 + CP3 / R6 within a reasonable range, the assembly stability of the optical lens can be ensured. The radius of curvature of the object side of the third lens can determine the thickness of the second bearing member, and the spacing distance between the second bearing member and the third bearing member in the extension direction of the optical axis ensures that the edge thickness of the third lens is within a reasonable range. The edge thickness, central thickness, and radius of curvature of the lens jointly affect the molding difficulty and assembly stability of the lens. When this conditional formula is satisfied, the smaller the value of the radius of curvature of the third lens, the better the assembly stability of the optical lens.

[0082] In this embodiment, the optical lens satisfies: 4.6 < f1 / (EP01 + CP1) < -2.5, where f1 is the effective focal length of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first bearing member in the extending direction of the optical axis, and CP1 is the maximum thickness of the first bearing member. By controlling f1 / (EP01 + CP1) within a reasonable range, the ratio of the edge thickness to the center thickness of the first lens can be ensured, which is beneficial to the molding of the first lens. At the same time, by controlling the effective focal length of the first lens, it is beneficial to control the curvature radius of the first lens. The parameters such as the edge thickness, center thickness, and curvature radius of the lens jointly affect the molding difficulty and the assembly stability of the lens. Under the condition of satisfying this formula, the smaller the effective focal length of the first lens, the better the assembly stability of the optical lens.

[0083] In this embodiment, the optical lens satisfies: -3.5 < (D3m - D1m) / (DT12 - DT41) < 1.0, where D3m is the outer diameter of the image-side surface of the third bearing member, D1m is the outer diameter of the image-side surface of the first bearing member, DT12 is the effective semi-aperture of the image-side surface of the first lens, and DT41 is the effective semi-aperture of the object-side surface of the fourth lens. By controlling (D3m - D1m) / (DT12 - DT,41) within a reasonable range, the changing trend of the lens barrel outer diameter from the lens barrel outer diameter near the first bearing member to the lens barrel outer diameter near the third bearing member is made to be consistent with the changing trend of the effective semi-aperture of the image-side surface of the first lens to the effective semi-aperture of the object-side surface of the fourth lens, which is beneficial to the molding of the lens barrel. At the same time, the maximum outer diameters of the first bearing member and the third bearing member can be restricted to ensure the field angle of the optical lens.

[0084] In this embodiment, the optical lens satisfies: 0.5 < CP2 / (|SAG22| + SAG31) < 2.0, where CP2 is the maximum thickness of the second bearing member, SAG22 is the distance on the optical axis between the intersection point of the image-side surface of the second lens and the optical axis and the maximum effective semi-aperture of the image-side surface of the second lens, and SAG31 is the distance on the optical axis between the intersection point of the object-side surface of the third lens and the optical axis and the maximum effective semi-aperture of the object-side surface of the third lens. By controlling CP2 / (|SAG22| + SAG31) within a reasonable range, the back sag of the second lens and the front sag of the third lens can be effectively controlled within a reasonable range, which is beneficial to controlling the surface curvature of the image-side surface of the second lens and the object-side surface of the third lens. At the same time, controlling the maximum thickness of the second bearing member within a reasonable range is beneficial to reducing the sensitivity of the air gap between the second lens and the third lens to field curvature.

[0085] In this embodiment, the radius of curvature of the image-side surface of the first lens is the minimum of the absolute values ​​of the radii of curvature of all the sides of the first and fourth lenses. Setting the radius of curvature of the first lens to be small allows light passing through the central region of the first lens to be well refracted.

[0086] Second Implementation Method

[0087] like Figures 1 to 19 As shown, the optical lens includes a lens barrel, a lens group, and a support assembly. The lens group is disposed within the lens barrel and consists of a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side. The first and fourth lenses have the same refractive index, which is less than 1.6. The support assembly is disposed within the lens barrel and includes a first support member, a second support member, and a third support member. The first support member is located on the image side of the first lens and at least partially contacts the image side of the first lens; the second support member is located on the image side of the second lens and at least partially contacts the image side of the second lens; and the third support member is located on the image side of the third lens and at least partially contacts the image side of the third lens. The optical lens satisfies the following:

[0088] 0.4 <N1 / EP01<2.0;

[0089] 0.2 <f*tan(Semi-FOV) / d0m<1.8;

[0090] CP1 / T12 + CP3 / T34 < 1.5;

[0091] Where f is the effective focal length of the optical lens, Semi-FOV is half of the maximum field of view of the optical lens, d0m is the inner diameter of the image-side end face of the lens barrel, N1 is the refractive index of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first support member in the direction of extension of the optical axis, CP1 is the maximum thickness of the first support member, T12 is the air gap between the first lens and the second lens on the optical axis, CP3 is the maximum thickness of the third support member, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0092] Since the first lens and the fourth lens in this application use materials with relatively low refractive indices, and 0.4 < N1 / EP01 < 2.0 is satisfied between N1 and EP01, and 0.2 < f*tan(Semi-FOV) / d0m < 1.8 is satisfied among f, Semi-FOV, and d0m, the optical lens can meet the performance of a wide angle. At the same time, the image height is matched with the inner diameter of the image-side end face of the lens barrel, so that the effective light passing through the fourth lens can better reach the imaging surface, ensuring the imaging quality. At the same time, it will cause certain difficulties in the molding of the first lens and the fourth lens. By further restricting the relationship between CP1, T12, CP3, and T34, this application can adjust the air gap between the lenses and limit the central thickness of adjacent lenses on the premise of ensuring the miniaturization of the lens, reduce the lens sensitivity, facilitate the later field curvature adjustment of the lens, and obtain the best lens performance.

[0093] Optionally, the above optical lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The optical lens in this application can use multiple lenses, such as the four lenses mentioned above. By reasonably distributing the effective focal lengths, surface shapes, central thicknesses of each lens, and the on-axis distances between each lens, etc., the aperture of the optical lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical lens more conducive to production and processing and applicable to portable electronic devices such as smart phones.

[0094] Preferably, the optical lens in this application is applicable to infrared light imaging.

[0095] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0096] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although the description is given with four lenses in the embodiment, the optical lens is not limited to including four lenses. If necessary, the optical lens may further include other numbers of lenses.

[0097] Figure 1 A schematic structural diagram of an optical lens of this application is shown. Figure 1The accompanying drawings also indicate parameters such as d0m, D1m, and d2s to provide a clear and intuitive understanding of their meaning. To facilitate the demonstration of the optical lens structure and specific surface features, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0098] Where Dis refers to the outer diameter of the object side surface of the i-th support member, dis refers to the inner diameter of the object side surface of the i-th support member, Dim refers to the outer diameter of the image side surface of the i-th support member, dim refers to the inner diameter of the image side surface of the i-th support member, CPi refers to the maximum thickness of the i-th support member, which is also the maximum distance along the optical axis from the object side surface to the image side surface of the i-th support member, and EPij refers to the distance along the optical axis between the image side surface of the i-th support member and the object side surface of the j-th support member, where i and j are positive integers greater than or equal to 1. d0s is the inner diameter of the object side end face of the lens barrel, and D0m is the outer diameter of the image side end face of the lens barrel. The maximum height L of the lens barrel P0 refers to the maximum distance along the optical axis from the object side end face to the image side end face of the lens barrel P0.

[0099] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lenses applicable to the above embodiments.

[0100] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 9, is applicable to all implementation methods of this application.

[0101] Example 1

[0102] like Figures 2 to 5 The image shows an optical lens according to an embodiment of this application.

[0103] like Figure 2 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens E1, a first support P1, a second lens E2, a second support P2, a third lens E3, a third support P3, a third auxiliary support P3b, and a fourth lens E4.

[0104] like Figure 2 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, and the image-side surface of the fourth lens is S8.

[0105] Table 1 shows the basic structural parameters of the optical lens in Embodiment 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0106] Face number face shape radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless S1 aspherical 20.000 0.3857 1.544 56.0 41.8297 S2 aspherical 2.284 1.3988 1.7315 STO spherical endless -0.0718 S3 aspherical 5.888 0.4123 1.661 20.4 0.0000 S4 aspherical -68.925 0.1851 -99.0000 S5 aspherical 2.662 1.1887 1.64 23.5 -5.9022 S6 aspherical -2.252 0.9214 0.9444 S7 aspherical -50.000 0.7732 1.544 56.0 0.0000 S8 aspherical 5.461 0.3000 -84.5042 S9 spherical endless 0.2100 1.517 64.2 S10 spherical endless 0.2645 S11 spherical endless

[0107] Table 1

[0108] Table 1 also shows the object side surface S9, the image side surface S10, and the imaging surface S11 of the filter.

[0109] In this embodiment, the object-side and image-side surfaces of the first to fourth lenses are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0110]

[0111] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror in this embodiment.

[0112] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.74E-01 -1.09E-01 7.71E-02 -6.19E-02 3.42E-02 -1.23E-02 2.82E-03 -3.67E-04 2.02E-05 S2 3.51E-01 -7.35E-01 2.75E+00 -6.27E+00 8.67E+00 -7.39E+00 3.76E+00 -1.04E+00 1.20E-01 S3 -3.04E-02 4.11E-01 -2.18E+00 6.71E+00 -1.26E+01 1.47E+01 -1.04E+01 4.04E+00 -6.69E-01 S4 -6.11E-02 -9.04E-03 4.11E-01 -1.27E+00 2.16E+00 -2.25E+00 1.43E+00 -5.12E-01 7.98E-02 S5 -5.65E-02 1.21E-01 -3.35E-01 6.76E-01 -8.90E-01 7.36E-01 -3.67E-01 1.01E-01 -1.18E-02 S6 1.53E-02 -1.36E-01 4.97E-01 -1.02E+00 1.28E+00 -9.93E-01 4.70E-01 -1.25E-01 1.42E-02 S7 -3.33E-02 -7.98E-01 2.10E+00 -3.49E+00 3.76E+00 -2.65E+00 1.21E+00 -3.22E-01 3.75E-02 S8 2.23E-01 -6.24E-01 9.14E-01 -8.74E-01 5.46E-01 -2.21E-01 5.58E-02 -7.93E-03 4.83E-04

[0113] Table 2

[0114] Figure 3 The on-axis chromatic aberration curve of the optical lens of Embodiment 1 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical lens. Figure 3 It can be seen that the optical lens in this embodiment is suitable for infrared light, preferably for light in the 920nm to 960nm band. When imaging in the 920nm to 960nm band, the on-axis chromatic aberration of the optical lens is small and the imaging quality is high. Figure 4 The astigmatism curve of the optical lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The magnification chromatic aberration curve of the optical lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0115] according to Figures 3 to 5 As can be seen, the optical lens given in Example 1 can achieve good imaging quality.

[0116] Example 2

[0117] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the support component are different.

[0118] like Figure 6 The image shows an optical lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0119] In Embodiment 2, the curvature radius, center thickness, and other parameters of the first to fourth lenses of the optical lens are the same as those in Embodiment 1, as are the inter-lens spacing and higher-order image coefficients, as shown in Tables 1 and 2. However, at least some parameters are different, such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses. Therefore, the imaging quality of the optical lens in this embodiment is as follows: Figures 3 to 5 As shown.

[0120] like Figure 6 As shown, this embodiment also includes a first auxiliary support member P1b.

[0121] Example 3

[0122] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the support component are different.

[0123] like Figure 7 The image shows an optical lens according to Embodiment 3 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0124] In Embodiment 3, the curvature radius, center thickness, and other parameters of the first to fourth lenses of the optical lens are the same as those in Embodiment 1, as are the inter-lens spacing and higher-order image coefficients, as shown in Tables 1 and 2. However, at least some parameters are different, such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses. Therefore, the imaging quality of the optical lens in this embodiment is as follows: Figures 3 to 5 As shown.

[0125] like Figure 7 As shown, in this embodiment, the optical lens has a third auxiliary support member P3b and a third auxiliary support member P3c. It should be noted that the positions of the third auxiliary support member P3b and the third auxiliary support member P3c can be interchanged, and no specific restrictions are made here.

[0126] Example 4

[0127] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the support member, and the lens are different.

[0128] like Figures 8 to 11 The image shows an optical lens according to Embodiment 4 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0129] like Figure 8 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens E1, a first support P1, a second lens E2, a second support P2, a third lens E3, a third support P3, a third auxiliary support P3b, and a fourth lens E4.

[0130] Table 3 shows the basic structural parameters of the optical lens in Embodiment 4, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0131] Face number face shape radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless S1 aspherical 1.983 0.3000 1.544 56.0 0.3418 S2 aspherical 0.930 0.5986 -0.1279 STO spherical endless 0.2351 S3 aspherical 41.283 0.6718 1.661 20.4 93.8518 S4 aspherical -2.729 0.0500 1.0094 S5 aspherical 2.549 1.9000 1.64 23.5 0.2093 S6 aspherical -2.531 0.7051 0.1834 S7 aspherical -4.648 0.3735 1.544 56.0 6.1833 S8 aspherical 9.050 0.3000 12.3718 S9 spherical endless 0.2100 1.517 64.2 S10 spherical endless 0.2988 S11 spherical endless

[0132] Table 3

[0133] In this embodiment, the object-side surface and image-side surface of the first to fourth lenses are both aspherical, and the surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0134] Table 4 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0135] Face number A4 A6 A8 A10 A12 A14 A16 S1 -6.54E-02 4.01E-01 -3.39E+00 1.75E+01 -6.54E+01 1.77E+02 -3.46E+02 S2 4.53E-02 -5.74E+00 1.71E+02 -2.60E+03 2.42E+04 -1.50E+05 6.46E+05 S3 1.86E-02 2.76E-01 -3.31E+00 2.11E+01 -8.38E+01 2.12E+02 -3.27E+02 S4 1.91E-01 -2.92E+00 2.41E+01 -1.34E+02 5.20E+02 -1.44E+03 2.88E+03 S5 1.13E-01 -1.11E+00 5.77E+00 -1.98E+01 4.66E+01 -7.73E+01 9.18E+01 S6 1.52E-01 -8.66E-01 5.41E+00 -2.20E+01 6.01E+01 -1.14E+02 1.55E+02 S7 2.34E-01 -1.89E-01 -5.94E+00 3.80E+01 -1.31E+02 2.92E+02 -4.50E+02 S8 6.18E-01 -2.66E+00 8.63E+00 -2.11E+01 3.69E+01 -4.60E+01 4.14E+01 Face number A18 A20 A22 A24 A26 A28 A30 S1 4.91E+02 -5.04E+02 3.70E+02 -1.89E+02 6.37E+01 -1.28E+01 1.15E+00 S2 -1.98E+06 4.32E+06 -6.69E+06 7.18E+06 -5.07E+06 2.11E+06 -3.93E+05 S3 2.37E+02 1.26E+02 -4.94E+02 5.46E+02 -3.23E+02 1.03E+02 -1.39E+01 S4 -4.23E+03 4.52E+03 -3.49E+03 1.88E+03 -6.75E+02 1.44E+02 -1.39E+01 S5 -7.82E+01 4.73E+01 -1.98E+01 5.37E+00 -8.36E-01 4.94E-02 1.78E-03 S6 -1.53E+02 1.09E+02 -5.60E+01 2.01E+01 -4.77E+00 6.75E-01 -4.30E-02 S7 4.89E+02 -3.80E+02 2.10E+02 -8.03E+01 2.02E+01 -3.03E+00 2.03E-01 S8 -2.72E+01 1.30E+01 -4.47E+00 1.08E+00 -1.73E-01 1.66E-02 -7.23E-04

[0136] Table 4

[0137] Figure 9 The on-axis chromatic aberration curve of the optical lens of Embodiment 4 is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical lens. Figure 9 It can be seen that the optical lens in this embodiment is suitable for infrared light, preferably for light in the 920nm to 960nm band. When imaging in the 920nm to 960nm band, the on-axis chromatic aberration of the optical lens is small and the imaging quality is high. Figure 10 The astigmatism curves of the optical lens of Embodiment 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 11 The magnification chromatic aberration curve of the optical lens in Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0138] according to Figures 9 to 11 It can be seen that the optical lens given in Example 4 can achieve good imaging quality.

[0139] Example 5

[0140] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the support component are different.

[0141] like Figure 12 The image shows an optical lens according to Embodiment 5 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0142] In Embodiment 5 and Embodiment 4, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order image coefficients of the first to fourth lenses are the same, as shown in Tables 3 and 4. However, at least some parameters such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses are different. Therefore, the imaging quality of the optical lens in this embodiment is as follows: Figures 9 to 11 As shown.

[0143] like Figure 12 As shown, there is no third auxiliary support P3b in this embodiment.

[0144] Example 6

[0145] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the support component are different.

[0146] like Figure 13 The image shows an optical lens according to Embodiment Six of this application. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0147] In Embodiment Six and Embodiment Four, the curvature radius, center thickness, and other parameters of the first to fourth lenses, as well as the spacing between the lenses and the higher-order image coefficients, are the same, as shown in Tables 3 and 4. However, at least some parameters, such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses, are different. Therefore, the imaging quality of the optical lens in this embodiment is as follows: Figures 9 to 11 As shown.

[0148] like Figure 13 As shown, there is no third auxiliary support P3b in this embodiment.

[0149] Example 7

[0150] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the support member, and the lens are different.

[0151] like Figures 14 to 17 The image shows an optical lens according to Embodiment Seven of this application. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0152] like Figure 14 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens E1, a first support P1, a second lens E2, a second support P2, a third lens E3, a third support P3, and a fourth lens E4.

[0153] Table 5 shows the basic structural parameters of the optical lens in Embodiment 7, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0154] Face number face shape radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless S1 aspherical 1.713 0.3591 1.544 56.0 -0.0229 S2 aspherical 0.945 0.6278 -0.2621 STO spherical endless 0.0839 S3 aspherical 82.740 0.6698 1.661 20.4 S4 aspherical -3.147 0.0526 -1.4031 S5 aspherical 2.524 2.3026 1.64 23.5 0.5175 S6 aspherical -2.114 0.5454 -0.1301 S7 aspherical -3.742 0.3417 1.544 56.0 4.3582 S8 aspherical 4.906 0.3000 0.0000 S9 spherical endless 0.2100 1.517 64.2 S10 spherical endless 0.3768 S11 spherical endless

[0155] Table 5

[0156] In this embodiment, the object-side surface and image-side surface of the first to fourth lenses are both aspherical, and the surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0157] Table 6 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0158]

[0159]

[0160] Table 6

[0161] Figure 15 The on-axis chromatic aberration curve of the optical lens of Embodiment Seven is shown, indicating the focal point deviation of light of different wavelengths after passing through the optical lens. Figure 15 It can be seen that the optical lens in this embodiment is suitable for infrared light, preferably for light in the 920nm to 960nm band. When imaging in the 920nm to 960nm band, the on-axis chromatic aberration of the optical lens is small and the imaging quality is high. Figure 16 The astigmatism curve of the optical lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The magnification chromatic aberration curve of the optical lens of Embodiment 7 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical lens.

[0162] according to Figures 15 to 17 It can be seen that the optical lens given in Example 7 can achieve good imaging quality.

[0163] Example 8

[0164] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the support component are different.

[0165] like Figure 18 The image shows an optical lens according to Embodiment Eight of this application. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0166] In Embodiment 8 and Embodiment 7, the first to fourth lenses of the optical lens have the same parameters such as radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients, as shown in Tables 5 and 6. However, at least some parameters differ, including the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses. Therefore, the imaging quality of the optical lens in this embodiment is as follows: Figures 15 to 17As shown.

[0167] like Figure 18 As shown, in this embodiment there is a second auxiliary support member P2b.

[0168] Example 9

[0169] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the support component are different.

[0170] like Figure 19 The image shows an optical lens according to Embodiment Nine of this application. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0171] In Embodiment Nine and Embodiment Seven, the first to fourth lenses of the optical lens have the same parameters such as radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients, as shown in Tables 5 and 6. However, at least some parameters differ, including the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses. Therefore, the imaging quality of the optical lens in this embodiment is as follows: Figures 15 to 17 As shown.

[0172] In summary, Examples 1 to 9 satisfy the relationships shown in Table 7.

[0173]

[0174]

[0175] Table 7

[0176] Table 8 provides some parameters of the optical lenses for Examples 1 to 9.

[0177] Structural parameters (mm) / Example 1 2 3 4 5 6 7 8 9 D1m 5.078 5.096 5.323 3.753 3.753 3.516 5.537 5.537 5.537 d2s 2.421 2.421 2.421 2.405 2.405 2.405 2.629 2.629 2.629 d3s 2.907 2.907 2.768 2.905 2.778 2.906 3.097 3.136 3.118 d3m 2.779 2.779 2.768 2.801 2.778 2.801 3.097 3.136 3.118 D3m 5.313 5.313 5.623 3.986 4.253 3.986 5.137 5.137 5.137 d0m 5.915 5.915 5.915 4.424 4.424 4.424 4.205 4.205 4.205 D0s 6.033 6.033 6.033 4.581 4.581 4.581 6.145 6.145 6.145 D0m 6.483 6.483 6.483 5.022 5.022 5.022 5.902 5.902 5.909 EP01 1.268 1.268 1.806 0.920 0.920 0.786 1.038 1.038 1.038 CP1 0.546 0.537 0.018 0.018 0.018 0.338 0.018 0.018 0.018 EP12 0.368 0.377 0.359 0.490 0.490 0.303 0.325 0.325 0.325 CP2 0.422 0.422 0.423 0.814 0.814 0.814 1.040 0.909 1.040 EP23 0.499 0.425 0.540 1.337 1.390 1.337 1.513 1.640 1.528 CP3 0.681 0.756 0.018 0.296 0.018 0.296 0.018 0.018 0.030 L 5.365 5.365 5.365 5.033 5.303 5.303 5.157 5.157 5.157

[0178] Table 8

[0179] Table 9 shows the effective focal lengths of the first to fourth lenses of the optical lenses in Embodiments 1 to 9.

[0180]

[0181]

[0182] Table 9

[0183] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0184] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0185] 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.

[0186] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0187] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens, characterized in that, include: Lens tube; A lens group is disposed inside the lens barrel, and the lens group consists of a first lens, a second lens, a third lens and a fourth lens in sequence from the object side to the image side, wherein the first lens and the fourth lens have the same refractive index and are less than 1.6; The first lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the second lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the third lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the fourth lens has negative optical power, its object-side surface is concave, and its image-side surface is concave. A support assembly is disposed within the lens barrel, and the support assembly includes a first support member, a second support member, and a third support member, wherein the first support member is located on the image side of the first lens and at least partially contacts the image side of the first lens, the second support member is located on the image side of the second lens and at least partially contacts the image side of the second lens, and the third support member is located on the image side of the third lens and at least partially contacts the image side of the third lens; The optical lens satisfies: 1.49mm -1 ≤N1 / EP01≤1.96mm -1 ; 0.77≤f*tan(Semi-FOV) / d0m≤1.54; 0.05≤CP1 / CT1≤1.13; 0.32≤(EP23+CP3) / (R7+R8)≤1.42; 2.29≤(d2s+d3s) / (f2+f3)≤3.19; Wherein, f is the effective focal length of the optical lens, Semi-FOV is half of the maximum field of view of the optical lens, d0m is the inner diameter of the image-side end face of the lens barrel, N1 is the refractive index of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first support member in the direction of optical axis extension, CP1 is the maximum thickness of the first support member, CT1 is the center thickness of the first lens, EP23 is the interval distance between the second support member and the third support member in the direction of optical axis extension, CP3 is the maximum thickness of the third support member, R7 is the radius of curvature of the object-side surface of the fourth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, d2s is the inner diameter of the object-side surface of the second support member, d3s is the inner diameter of the object-side surface of the third support member, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -0.55≤(d3s+d3m-d0m) / R7≤-0.24, where d3s is the inner diameter of the object side surface of the third support member, d3m is the inner diameter of the image side surface of the third support member, d0m is the inner diameter of the image side end face of the lens barrel, and R7 is the radius of curvature of the object side surface of the fourth lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.91≤(EP12-EP23) / (R4+R5)≤5.74, where EP12 is the distance between the first support member and the second support member in the direction of extension of the optical axis, EP23 is the distance between the second support member and the third support member in the direction of extension of the optical axis, R4 is the radius of curvature of the image side of the second lens, and R5 is the radius of curvature of the object side of the third lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.05≤CP1 / T12+CP3 / T34≤0.83, where CP1 is the maximum thickness of the first support member, T12 is the air gap between the first lens and the second lens on the optical axis, CP3 is the maximum thickness of the third support member, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.75≤EP01 / (R1-R2)≤1.35, where EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first support member in the direction of extension of the optical axis, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens.

6. The optical lens according to claim 1, characterized in that, The radius of curvature of the object side surface of the fourth lens is less than zero, and the optical lens satisfies: 1.64≤D0m / (R7+R8)≤6.31, where D0m is the outer diameter of the image side end face of the lens barrel, R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 2.11≤L / f / (D0s / D0m)≤2.84, where L is the maximum height of the lens barrel, f is the effective focal length of the optical lens, D0s is the outer diameter of the object-side end face of the lens barrel, and D0m is the outer diameter of the image-side end face of the lens barrel.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.10≤∑AT / (CP1+CP2+CP3)≤1.87, where CP1 is the maximum thickness of the first support member, CP2 is the maximum thickness of the second support member, CP3 is the maximum thickness of the third support member, and ∑AT is the sum of the air gaps on the optical axis between all adjacent lenses in the optical lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.92≤EP23 / CT2+R4 / R3≤2.41, where CT2 is the center thickness of the second lens, EP23 is the distance between the second support member and the third support member in the extension direction of the optical axis, R4 is the radius of curvature of the image side of the second lens, and R3 is the radius of curvature of the object side of the second lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.41≤EP23 / R5+CP3 / R6≤0.64, where EP23 is the distance between the second support member and the third support member in the extension direction of the optical axis, R5 is the radius of curvature of the object side of the third lens, CP3 is the maximum thickness of the third support member, and R6 is the radius of curvature of the image side of the third lens.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -4.45≤f1 / (EP01+CP1)≤-3.23, where f1 is the effective focal length of the first lens, EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first support member in the direction of extension of the optical axis, and CP1 is the maximum thickness of the first support member.

12. The optical lens according to any one of claims 1-11, characterized in that, The optical lens satisfies: -0.84≤(D3m-D1m) / (DT12-DT41)≤0.74, where D3m is the outer diameter of the image side of the third support member, D1m is the outer diameter of the image side of the first support member, DT12 is the effective half-aperture of the image side of the first lens, and DT41 is the effective half-aperture of the object side of the fourth lens.

13. The optical lens according to any one of claims 1-11, characterized in that, The optical lens satisfies: 0.98≤CP2 / (|SAG22|+SAG31)≤1.15, where CP2 is the maximum thickness of the second support member, SAG22 is the distance on the optical axis between the intersection of the image-side surface of the second lens and the optical axis and the maximum effective half-aperture of the image-side surface of the second lens, and SAG31 is the distance on the optical axis between the intersection of the object-side surface of the third lens and the optical axis and the maximum effective half-aperture of the object-side surface of the third lens.

14. The optical lens according to any one of claims 1-11, characterized in that, The radius of curvature of the image side of the first lens is the minimum of the absolute values ​​of the radii of curvature of all sides of the first lens and the fourth lens.

Images