Optical imaging lens

Abstract

The present application provides an optical imaging lens, which includes a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes first to sixth lenses arranged in sequence from the object side to the image side along the optical axis, and the optical power is distributed as "negative - negative - positive - positive - negative - positive", the central thickness of the third lens among the six lenses is the largest, the surface type of the first lens is convex on the object side and concave on the image side, the surface type of the third lens is concave on the object side and convex on the image side, the spacer assembly includes a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens; the optical imaging lens further satisfies: 7.00 < L / (f×tan(Semi - FOV / 2)) < 7.77, 2.45 < (d0s - D3s) / d3s < 3.0, 1.83 < R5 / R6 + EP23 / CT3 < 2.30.

Description

Technical Field

[0001] The present application relates to the technical field of optical devices, and particularly to an optical imaging lens. Background Art

[0002] With the improvement of living standards and the enhancement of safety awareness, people have higher requirements for home security. Therefore, consumers generally require that surveillance lenses have a large angle, high resolution, and can obtain bright and clear camera images even in dim environments at night. Among the numerous optical imaging lenses applied to the surveillance field, fisheye lenses have been widely used due to their advantage of a large field of view.

[0003] However, the imaging quality of most existing fisheye lenses is not ideal. In particular, the outer diameter of the lens closest to the object side is relatively large, and the subsequent lenses are greatly affected by assembly stress during the assembly process. After assembly, the performance of the entire lens is prone to instability, thus unable to meet the growing needs of consumers. Summary of the Invention

[0004] One advantage of the present application is to provide an optical imaging lens that can solve the adverse effects on the lens performance caused by the relatively large outer diameter of the lens closest to the object side in the existing fisheye module, resulting in unstable assembly.

[0005] The optical imaging lens includes a lens barrel, a lens group, and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power. Among them, the central thickness of the third lens is greater than that of any other lens. The object side surface of the first lens is convex, and the image side surface is concave. The object side surface of the third lens is concave, and the image side surface is convex. The spacer assembly includes a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element placed on the image side of the third lens and in contact with the image side surface of the third lens. The optical imaging lens satisfies:

[0006] 7.00 < L / (f × tan(Semi - FOV / 2)) < 7.77;

[0007] 2.45 < (d0s - D3s) / d3s < 3.00;

[0008] 1.83 < R5 / R6 + EP23 / CT3 < 2.30;

[0009] Wherein, L is the maximum height of the lens barrel; f is the effective focal length of the optical imaging lens; Semi-FOV is half of the maximum field of view angle of the optical imaging lens; d0s is the inner diameter of the object side of the lens barrel; D3s is the outer diameter of the object side of the third spacer element; d3s is the inner diameter of the object side of the third spacer element; R5 is the curvature radius of the object side of the third lens; R6 is the curvature radius of the image side of the third lens; EP23 is the distance between the second spacer element and the third spacer element along the optical axis direction; CT3 is the central thickness of the third lens.

[0010] In some embodiments of the present application, the optical imaging lens further satisfies:

[0011] -10.85 < (f1 + f2) / f < -9.90, 1.75 < EP02 / CT1 < 2.65;

[0012] Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f is the effective focal length of the optical imaging lens, EP02 is the distance between the object side end face of the lens barrel and the object side of the second spacer element along the optical axis direction, and CT1 is the central thickness of the first lens.

[0013] In some embodiments of the present application, the optical imaging lens further satisfies:

[0014] -4.90 < f2 / f < -4.35, 2.35 < |(R3 + R4)| / SG21 < 12.45;

[0015] Wherein, f2 is the effective focal length of the second lens, f is the effective focal length of the optical imaging lens, R3 is the curvature radius of the object side of the second lens, R4 is the curvature radius of the image side of the second lens, and SG21 is the distance between the intersection of the object side of the effective diameter region of the second lens and the optical axis and the object side of the non-effective diameter region of the second lens along the optical axis direction.

[0016] In some embodiments of the present application, the optical imaging lens further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens, and the optical imaging lens further satisfies:

[0017] 3.40 < (CP4 + CP3) / (T34 + T45) < 5.70;

[0018] Wherein, CP4 is the maximum thickness of the fourth spacer element, CP3 is the maximum thickness of the third spacer element, T34 is the air gap between the third lens and the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0019] In some embodiments of the present application, the optical imaging lens further satisfies:

[0020] 0.65 < (CP2 + CP3) / EP23 < 1.87;

[0021] wherein, CP2 is the maximum thickness of the second spacer element, CP3 is the maximum thickness of the third spacer element, and EP23 is the distance between the second spacer element and the third spacer element along the optical axis direction.

[0022] In some embodiments of the present application, the optical imaging lens further satisfies:

[0023] 1.60 < (T12 + T23) / EP02 < 2.32;

[0024] wherein, T12 is the air gap between the first lens and the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and EP02 is the distance from the object side end face of the lens barrel to the object side surface of the second spacer element along the optical axis direction.

[0025] In some embodiments of the present application, the optical imaging lens further satisfies:

[0026] 2.70 ≤ D0s / D0m × FNO < 4.00;

[0027] wherein, D0s is the outer diameter of the object side surface of the lens barrel, D0m is the outer diameter of the image side surface of the lens barrel, and FNO is the aperture number of the optical imaging lens.

[0028] In some embodiments of the present application, the optical imaging lens further satisfies:

[0029] 0.38 < (T12 + T23) / L < 0.47;

[0030] wherein, T12 is the air gap between the first lens and the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and L is the maximum height of the lens barrel.

[0031] In some embodiments of the present application, the optical imaging lens further satisfies:

[0032] 1.70 < D2m / d3s < 2.40, 1.85 < d0s / D2s < 2.65;

[0033] wherein, D2m is the outer diameter of the image side surface of the second spacer element, d3s is the inner diameter of the object side surface of the third spacer element, d0s is the inner diameter of the object side surface of the lens barrel, and D2s is the outer diameter of the object side surface of the second spacer element.

[0034] In some embodiments of the present application, each lens of the lens group further has an outer peripheral surface located between the object side surface and the image side surface. The outer peripheral surface of the first lens is parallel to the optical axis of the optical imaging lens, and the outer peripheral surface of the first lens is in contact with the inner wall of the lens barrel. The optical imaging lens further satisfies:

[0035] 0.14 mm < SP1 < 0.3 mm;

[0036] Wherein, SP1 is the contact length of the outer peripheral surface of the first lens and the inner wall of the lens barrel along the optical axis direction.

[0037] In some embodiments of the present application, the optical imaging lens further satisfies:

[0038] 1.15 < (OD1 - OD2) / (D2s - d0m) < 3.15;

[0039] Wherein, OD1 is the maximum outer diameter of the first lens, OD2 is the maximum outer diameter of the second lens, D2s is the outer diameter of the object side surface of the second spacer element, and d0m is the inner diameter of the image side surface of the lens barrel.

[0040] In some embodiments of the present application, the optical imaging lens further satisfies:

[0041] 3.05 ≤ (OD1 - OD2) / (OD2 - D0m) < 6.05;

[0042] OD1 is the maximum outer diameter of the first lens, OD2 is the maximum outer diameter of the second lens, and D0m is the outer diameter of the image side surface of the lens barrel.

[0043] In some embodiments of the present application, the fifth lens and the sixth lens are glued together. The spacer assembly further includes a fourth spacer element placed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens. The inner diameter of the image side surface of the lens barrel is smaller than the inner diameter of the fifth spacer element, and the image side surface of the fifth spacer element is also in contact with the inner wall of the lens barrel. The optical imaging lens further satisfies:

[0044] 0.68 ≤ EP45 / (CT5 + CT6) ≤ 0.80;

[0045] Wherein, EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis direction, CT5 is the central thickness of the fifth lens, and CT6 is the central thickness of the sixth lens.

[0046] In some embodiments of the present application, the object side surface of the first lens is convex and the image side surface is concave; the image side surface of the second lens is concave, the object side surface of the third lens is concave and the image side surface is convex, the object side surface of the fourth lens is convex and the image side surface is convex, the object side surface of the fifth lens is concave and the image side surface is concave, and the object side surface of the sixth lens is convex and the image side surface is convex.

[0047] In summary, the optical imaging lens of the present application belongs to an ultra-wide-angle lens. The negative optical power design of the first lens and the use of large and small apertures on the object side and image side surfaces of the lens are beneficial to fully exert the large field of view function of the ultra-wide-angle lens. Further, the optical powers of the second to sixth lenses are distributed as "negative - positive - positive - negative - positive", so that the optical imaging lens has good imaging quality. However, the third lens is an intermediate lens and its central thickness is greater than the central thicknesses of other lenses. The radial step difference between the third spacer element on the image side of the third lens and the object side surface of the lens barrel is relatively large. Under the supporting action of the spacer assembly, the third lens needs to bear the pressure from the object side lens. By restricting the relationship between the inner diameter of the object side surface of the lens barrel, the outer diameter of the third spacer element, and the inner diameter of the third spacer element, although it can restrict the radial step difference from the object side to the image side of the optical imaging lens and the radial height of the non-effective diameter region of the lens to a certain extent, the third lens will still bear a large radial pressure, resulting in lens deformation. Based on this, by restricting the curvature radius of the third lens, the central thickness of the third lens, and the spacing between the second and third spacer elements in the optical axis direction, and further restricting the overall shape of the third lens and the thickness ratio between the middle thickness and the non-effective diameter region, the stress can be concentrated in the non-effective diameter region of the lens, thereby reducing the change in the E3 surface shape of the third lens and the deformation at the junction between the effective diameter region and the non-effective diameter region, which is beneficial to increasing the stability and reliability after lens assembly.

[0048] According to another aspect of the present application, the present application also provides an optical imaging lens, including a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the spacer assembly includes a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens; a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; the fifth lens and the sixth lens are glued together; the image side surface of the fifth spacer element is in contact with the inner wall of the lens barrel; the optical imaging lens further satisfies:

[0049] 0.40 < (D5m - d5m) / CP5 < 1.55; and

[0050] 0.68 ≤ EP45 / (CT5 + CT6) ≤ 0.80;

[0051] Wherein, D5m is the outer diameter of the image side of the fifth spacer element, d5m is the inner diameter of the image side of the fifth spacer element, CP5 is the maximum thickness of the fifth spacer element, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element in the optical axis direction, CT5 is the central thickness of the fifth lens, and CT6 is the central thickness of the sixth lens.

[0052] In summary, the optical imaging lens provided in this application is composed of six lenses, wherein the fifth lens and the sixth lens are glued together, the object side of the fifth spacer element contacts the image side of the fifth lens, and the image side of the fifth spacer element contacts the inner wall of the lens barrel; since the fifth spacer element affects the stability of the upper and lower support of the fifth lens to a certain extent, by restricting the maximum thickness of the fifth spacer element and the contact area between the image side of the fifth spacer element and the lens barrel, it is beneficial to improve the support stability; further, the distance from the image side of the fourth spacer element to the object side of the fifth spacer element along the optical axis direction reflects the thickness of the structural edge of the fifth lens. Since the fifth lens has a structure with a thin center and thick edges, by reasonably controlling the central thickness and the edge thickness, the problem of welding marks during the molding of the fifth lens can be avoided. Brief Description of the Drawings

[0053] Figure 1A is a schematic structural diagram of the optical imaging lens under Condition 1-1 of Embodiment 1 of this application;

[0054] Figure 1B is a schematic structural diagram of the optical imaging lens under Condition 1-2 of Embodiment 1 of this application;

[0055] Figure 1C is a schematic structural diagram of the optical imaging lens under Condition 1-3 of Embodiment 1 of this application;

[0056] Figure 2A is a schematic diagram of the axial chromatic aberration curve under three conditions in Embodiment 1 above;

[0057] Figure 2B is a schematic diagram of the astigmatism curve under three conditions in Embodiment 1 above;

[0058] Figure 2C is a schematic diagram of the relative illumination curve under three conditions in Embodiment 1 above;

[0059] Figure 3A is a schematic structural diagram of the optical imaging lens under Condition 2-1 of Embodiment 2 of this application;

[0060] Figure 3B is a schematic structural diagram of the optical imaging lens under Condition 2-2 of Embodiment 2 of this application;

[0061] Figure 3C It is a schematic structural diagram of an optical imaging lens under operating condition 2-3 of Embodiment 2 of the present application;

[0062] Figure 4A It is a schematic diagram of the axial chromatic aberration curve under three operating conditions in Embodiment 2 above;

[0063] Figure 4B It is a schematic diagram of the astigmatism curve under three operating conditions in Embodiment 2 above;

[0064] Figure 4C It is a schematic diagram of the relative illumination curve under three operating conditions in Embodiment 2 above;

[0065] Figure 5A It is a schematic structural diagram of an optical imaging lens under operating condition 3-1 of Embodiment 3 of the present application;

[0066] Figure 5B It is a schematic structural diagram of an optical imaging lens under operating condition 3-2 of Embodiment 3 of the present application;

[0067] Figure 5C It is a schematic structural diagram of an optical imaging lens under operating condition 3-3 of Embodiment 3 of the present application;

[0068] Figure 6A It is a schematic diagram of the axial chromatic aberration curve under three operating conditions in Embodiment 3 above;

[0069] Figure 6B It is a schematic diagram of the astigmatism curve under three operating conditions in Embodiment 3 above;

[0070] Figure 6C It is a schematic diagram of the relative illumination curve under three operating conditions in Embodiment 3 above;

[0071] Figure 7A It is a schematic diagram of partial structural dimensions of the optical imaging lens provided by the present application;

[0072] Figure 7B It is a schematic diagram of another part of the structural dimensions of the optical imaging lens provided by the present application;

[0073] Figure 7C It is a schematic diagram of the structural dimensions of the second lens of the optical imaging lens provided by the present application;

[0074] Figure 8A It shows a schematic diagram of the shear stress distribution at the lens barrel at the third lens when the optical imaging lens satisfies L / (f×tan(Semi-FOV / 2)) = 7.23; R5 / R6 + EP23 / CT3 = 1.30; (d0s - D3s) / d3s = 2.27;

[0075] Figure 8B It shows that for the optical imaging lens, when L / (f×tan(Semi-FOV / 2)) = 7.23; R5 / R6 + EP23 / CT3 = 2.60; (d0s - D3s) / d3s = 2.27;

[0076] Figure 8C It shows a schematic diagram of the shear stress distribution at the third lens when the lens barrel is located at the third lens for the optical imaging lens when L / (f×tan(Semi-FOV / 2)) = 7.23; R5 / R6 + EP23 / CT3 = 5.60; (d0s - D3s) / d3s = 2.27.

[0077] Reference numerals:

[0078] E1, the first lens; E2, the second lens; E3, the third lens; E4, the fourth lens; E5, the fifth lens; E6, the sixth lens; P0, the lens barrel; P2, the second spacer element; P3, the third spacer element; P4, the fourth spacer element; P5, the fifth spacer element. Detailed implementation manners

[0079] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0080] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens E1 discussed below may also be referred to as the second lens E2 or the third lens E3.

[0081] In the drawings, for the sake of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0082] In this article, the effective diameter region of the lens refers to the part of the lens used for imaging or light transmission, and the non-effective diameter region of the lens refers to the part of the lens that does not participate in imaging or light transmission. This non-effective diameter region is mainly used to cooperate and contact with the spacer elements and the lens barrel of the lens to fix the position of the lens in the lens. Generally speaking, the object side surface and the image side surface of the non-effective diameter region are parallel to each other to facilitate assembly.

[0083] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made according to the general methods in the art. For example, the convexity and concavity can be judged by the sign of the R value (R refers to the radius of curvature in the paraxial region). In this document, the surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens. For the object side surface, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; for the image side surface, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0084] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0085] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0086] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0087] As Figure 7AAs shown in the figure, the present application provides an optical imaging lens, which includes a lens barrel P0, and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens E1 with a negative optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4 with a positive optical power, a fifth lens E5 with a negative optical power, and a sixth lens E6 with a positive optical power, wherein the central thickness of the third lens E3 is greater than that of any other lens, the object side surface of the first lens E1 is convex and the image side surface is concave, the object side surface of the third lens E3 is concave and the image side surface is convex; the spacer assembly includes a second spacer element P2 placed on the image side of the second lens E2 and in contact with the image side surface of the second lens E2, and a third spacer element P3 placed on the image side of the third lens E3 and in contact with the image side surface of the third lens E3;

[0088] In particular, the optical imaging lens satisfies: 7.00 < L / (f×tan(Semi - FOV / 2)) < 7.77, 2.45 < (d0s - D3s) / d3s < 3.00, and 1.83 < R5 / R6 + EP23 / CT3 < 2.30;

[0089] Wherein, L is the maximum height of the lens barrel P0; f is the effective focal length of the optical imaging lens; Semi - FOV is half of the maximum field of view angle of the optical imaging lens; d0s is the inner diameter of the object side surface of the lens barrel P0; D3s is the outer diameter of the object side surface of the third spacer element P3; d3s is the inner diameter of the object side surface of the third spacer element P3; R5 is the curvature radius of the object side surface of the third lens E3; R6 is the curvature radius of the image side surface of the third lens E3; EP23 is the interval distance between the second spacer element P2 and the third spacer element P3 along the optical axis direction; CT3 is the central thickness of the third lens E3.

[0090] It should be noted that in the above embodiments of the present application, the optical imaging lens belongs to an ultra-wide-angle lens. The design of the negative optical power of the first lens E1 and the use of large and small apertures on the object side and the image side are beneficial to fully exert the large field-of-view function of the ultra-wide-angle lens. Further, the optical powers of the second to sixth lenses E6 are distributed as "negative-positive-positive-negative-positive", so that the optical imaging lens has good imaging quality. Since the third lens E3 is an intermediate lens and its central thickness is greater than the central thicknesses of other lenses, the radial step difference between the third spacer element P3 on the image side of the third lens E3 and the radial section of the object side of the lens barrel P0 is relatively large. Under the supporting action of the spacer assembly, the third lens E3 needs to bear the pressure from the object-side lens. By restricting the relationship between the inner diameter of the object side of the lens barrel P0, the outer diameter of the object side of the third spacer element P3, and the inner diameter of the object side of the third spacer element P3, although the radial step difference from the object side to the image side of the optical imaging lens and the radial height of the non-effective diameter region of the lens can be restricted to a certain extent, the third lens E3 will still bear a relatively large radial pressure. Based on this, by restricting the radius of curvature of the third lens E3, the central thickness of the third lens E3, and the distance between the second and third spacer elements P3 in the optical axis direction, and further restricting the overall shape of the third lens E3 and the ratio of the middle thickness to the thickness of the non-effective diameter region, the stress can be concentrated in the non-effective diameter region of the lens, thereby reducing the change in the surface shape of the third lens E3 and the deformation at the junction of the effective diameter region and the non-effective diameter region, which is beneficial to increasing the stability and reliability after lens assembly.

[0091] The above-mentioned radial step difference refers to the radial height difference between two adjacent stepped surfaces on the inner wall of the lens barrel P0, and the radial height of the non-effective diameter region refers to the difference between the outer diameter and the inner diameter of the non-effective diameter region of the lens.

[0092] According to some embodiments of the present application, the object side of the first lens E1 is a convex surface and the image side is a concave surface; the image side of the second lens E2 is a concave surface, the object side of the third lens E3 is a concave surface and the image side is a convex surface, the object side of the fourth lens E4 is a convex surface and the image side is a convex surface, the object side of the fifth lens E5 is a concave surface and the image side is a concave surface, and the object side of the sixth lens E6 is a convex surface and the image side is a convex surface.

[0093] Exemplarily, Figure 8A shows a schematic diagram of the stress distribution at the third lens E3 when the optical imaging lens satisfies L / (f×tan(Semi-FOV / 2)) = 7.23; R5 / R6 + EP23 / CT3 = 1.30; (d0s-D3s) / d3s = 2.27; Figure 8BShows a schematic diagram of the stress distribution at the third lens E3 when the optical imaging lens satisfies L / (f×tan(Semi - FOV / 2)) = 7.23; R5 / R6 + EP23 / CT3 = 2.60; (d0s - D3s) / d3s = 2.27; Figure 8C Shows a schematic diagram of the stress distribution at the third lens E3 when the optical imaging lens satisfies L / (f×tan(Semi - FOV / 2)) = 7.23; R5 / R6 + EP23 / CT3 = 5.60; (d0s - D3s) / d3s = 2.27. It can be seen from the three figures that the left - hand arc - shaped part is the effective diameter region of the third lens E3, and the remaining right - hand part is the non - effective diameter region of the third lens E3. In Figure 8A the shown embodiment, the maximum stress is concentrated at the effective diameter region of the object side surface of the third lens E3, and the value is relatively large, which is likely to cause a large deformation of the object side surface of the third lens E3 and change the surface shape of this surface; in Figure 8C it, the stress values are generally large as a whole, and serious stress concentration is formed at the junction of the effective diameter region and the non - effective diameter region of the third lens E3 (i.e., the groove in the figure), which is easy to be damaged; while in Figure 8B it, the maximum stress is concentrated inside the non - effective diameter region of the third lens E3, and the value is relatively small, so the influence on the surface shape of the lens is relatively small.

[0094] Preferably, the optical imaging lens satisfies: 7.05 ≤ L / (f×tan(Semi - FOV / 2)) ≤ 7.75; 2.48 ≤ (d0s - D3s) / d3s ≤ 2.97; 1.85 ≤ R5 / R6 + EP23 / CT3 ≤ 2.27.

[0095] In some embodiments of the present application, the optical imaging lens further satisfies: - 10.85 < (f1 + f2) / f < - 9.90, 1.75 < EP02 / CT1 < 2.65;

[0096] wherein, f1 is the effective focal length of the first lens E1, f2 is the effective focal length of the second lens E2, f is the effective focal length of the optical imaging lens, EP02 is the distance from the object - side end face of the lens barrel P0 to the object - side surface of the second spacer P2 along the optical axis direction, and CT1 is the central thickness of the first lens E1.

[0097] In this way, while achieving an ultra-wide-angle lens, the optical performance of the lens can be further improved. First, the first lens outside the fish-eye lens usually has a short focal length. Its main function is to initially converge the light from a wide viewing angle and guide the light to the subsequent lens group, laying the foundation for the ultra-wide-angle characteristics of the fish-eye lens. Second, the focal length of the second lens is also short. It is mainly used to further correct and optimize the light that has been initially converged by the first lens. By adjusting the focal length of the second lens, the degree of light convergence, angle, etc. can be finely adjusted to improve the imaging quality, reduce problems such as aberration and distortion, and enable the light to accurately focus on the imaging plane to form a clear image. At the same time, EP02 and CT1 affect the overall thickness of these two lenses and determine the degree of convergence of the two lenses for the external field light.

[0098] Preferably, the optical imaging lens satisfies: -10.77 ≤ (f1 + f2) / f ≤ -9.95, 1.76 ≤ EP02 / CT1 ≤ 2.61.

[0099] As Figure 7A and 7C shown, in some embodiments of the present application, the optical imaging lens further satisfies: -4.90 < f2 / f < -4.35, 2.35 < |(R3 + R4)| / SG21 < 12.45;

[0100] wherein, f2 is the effective focal length of the second lens E2, f is the effective focal length of the optical imaging lens, R3 is the curvature radius of the object side surface of the second lens E2, R4 is the curvature radius of the image side surface of the second lens E2, and SG21 is the distance along the optical axis from the intersection of the object side surface of the effective diameter region of the second lens E2 to the object side surface of the non-effective diameter region of the second lens E2.

[0101] In this way, it is ensured that while the second lens E2 refracts the light, there will be no position interference with the first lens E1. Specifically, the focal length of the second lens E2 is short. It is mainly used to further correct and optimize the light that has been initially converged by the first lens. Therefore, it needs to have the function of a concave lens and cooperate with other lenses to jointly determine the focal length of the entire optical imaging lens. Since the first lens E1 needs to protrude from the lens barrel P0 to collect light and considering space saving, the second lens E2 also needs to be made into a "meniscus" lens. By controlling the curvature radius of the second lens E2 and SG21, the bending degree of the second lens E2 is controlled to ensure that the second lens E2 refracts the light without position interference with the first lens E1.

[0102] Preferably, the optical imaging lens satisfies: -4.85 ≤ f2 / f ≤ -4.42, 2.37 ≤ |(R3+R4)| / SG21 ≤ 12.41.

[0103] In some embodiments of the present application, the optical imaging lens further includes a fourth spacer element P4 disposed on the image side of the fourth lens E4 and in contact with the image side surface of the fourth lens E4. The optical imaging lens further satisfies: 3.40 < (CP4+CP3) / (T34+T45) < 5.70;

[0104] Wherein, CP4 is the maximum thickness of the fourth spacer element P4, CP3 is the maximum thickness of the third spacer element P3, T34 is the air gap between the third lens E3 and the fourth lens E4 on the optical axis, and T45 is the air gap between the fourth lens E4 and the fifth lens E5 on the optical axis.

[0105] In this way, by controlling the maximum thicknesses of the third and fourth spacer elements and the air gaps between the third, fourth, and fifth lenses on the optical axis, and thus reasonably controlling the edge thickness of the lenses and the central thickness of the lenses on the optical axis, it is possible to ensure good processing feasibility of the lenses, and effectively ensure the accuracy of the bearing positions between the lenses after assembly, so that the optical parameters of the lens meet the design requirements. In addition, by reasonably controlling the edge thickness of the lenses and the central thickness of the lenses on the optical axis, it is also possible to prevent interference between the effective diameter regions of the lenses in the optical axis direction after assembly, avoid lens appearance problems and performance abnormality problems, and improve the appearance and performance yield.

[0106] Preferably, the optical imaging lens satisfies: 3.43 ≤ (CP4+CP3) / (T34+T45) ≤ 5.68.

[0107] In some embodiments of the present application, the optical imaging lens further satisfies: 0.65 < (CP2+CP3) / EP23 < 1.87;

[0108] Wherein, CP2 is the maximum thickness of the second spacer element P2, CP3 is the maximum thickness of the third spacer element P3, and EP23 is the spacing distance between the second spacer element P2 and the third spacer element P3 along the optical axis.

[0109] In this way, both the requirements of the lens surface shape for the processing technology and the influence of the lens structural strength on the overall reliability of the lens are considered. Specifically, when the edges of the effective diameter regions of the second and third lenses are close to each other, the second spacer element P2 uses a stamping spacer with a relatively thin thickness. When the distance is far, the second spacer element P2 uses an injection-molded spacer with a relatively thick thickness. The same applies to the third spacer element P3. Such a setting is to ensure that the structural thickness of the third lens E3 remains within a suitable range. When the structural thickness of the third lens E3 is too large, due to the large difference in the filling speed of the adhesive material, it is easy to generate a weld line at the edge position of the lens, affecting the imaging quality. When the structural thickness of the lens is too small, it cannot provide the required strength, and it is easy to cause problems such as lens fragmentation during assembly or use, ultimately affecting the reliability quality of the lens.

[0110] Preferably, the optical imaging lens further satisfies: 0.67 ≤ (CP2 + CP3) / EP23 ≤ 1.85.

[0111] In some embodiments of the present application, the optical imaging lens further satisfies: 1.60 < (T12 + T23) / EP02 < 2.32;

[0112] Wherein, T12 is the air gap on the optical axis between the first lens E1 and the second lens E2, T23 is the air gap on the optical axis between the second lens E2 and the third lens E3, and EP02 is the distance from the object-side end face of the lens barrel P0 to the object-side surface of the second spacer element P2 along the optical axis.

[0113] In this way, the distance from the object-side end face of the lens barrel P0 to the object-side surface of the second spacer element P2 is correlated with the air gap between the lenses, which determines the position and installation accuracy of the second spacer element P2 within the lens barrel P0. The spacer element is used to fix the position and spacing of the lenses. If this distance is inaccurate, it will cause the spacer element to be unable to be correctly installed, thereby affecting the relative position of the lenses and the accuracy of the air gap. For example, a distance deviation may cause the spacer element to not support the lens evenly, resulting in lens tilt or uneven air gap, ultimately affecting the imaging effect.

[0114] Preferably, the optical imaging lens further satisfies: 1.63 ≤ (T12 + T23) / EP02 ≤ 2.30.

[0115] In some embodiments of the present application, the optical imaging lens further satisfies: 2.70 ≤ D0s / D0m × FNO < 4.00;

[0116] Wherein, D0s is the outer diameter of the object-side surface of the lens barrel P0, D0m is the outer diameter of the image-side surface of the lens barrel P0, and FNO is the aperture number of the optical imaging lens.

[0117] In this way, it is beneficial to reduce the distortion of calibrating the fisheye lens. Specifically, D0s affects the light input of the entire lens. Since the fisheye lens has a very large field of view angle, sufficient light must enter to have good resolution; D0m affects the size of the chip, and it is necessary to ensure that the chip can be completely included without blocking the light transmitted by the lens; the fisheye lens itself has relatively large distortion, and the size of the aperture will affect the performance of the distortion to a certain extent. Generally speaking, a smaller aperture can reduce the distortion to a certain extent, making the deformation at the edge of the picture relatively smaller and making the image more regular. This is because a small aperture can make the light pass more concentratedly through the central area of the lens, reducing the refraction and deformation of the light at the edge.

[0118] Preferably, the optical imaging lens further satisfies: 2.70 ≤ D0s / D0m × FNO ≤ 3.59.

[0119] In some embodiments of the present application, the optical imaging lens further satisfies: 0.38 < (T12 + T23) / L < 0.47;

[0120] Wherein, T12 is the air gap between the first lens E1 and the second lens E2 on the optical axis, T23 is the air gap between the second lens E2 and the third lens E3 on the optical axis, and L is the maximum height of the lens barrel P0.

[0121] In this way, a suitable air gap is beneficial to give sufficient space for the light to propagate and ensure the stability of the mechanism. The cooperation of T12 and T23 affects the collection and correction of light by the lens. Reasonably controlling the ratio of the total length of the first two air gaps to the lens barrel P0 can make the angle between the incident light and the optical axis smaller after passing through the first two lenses, leaving more space, which is more conducive to the design of the subsequent lens group structure. Preferably, the optical imaging lens further satisfies: 0.39 ≤ (T12 + T23) / L ≤ 0.46.

[0122] In some embodiments of the present application, the optical imaging lens further satisfies: 1.70 < D2m / d3s < 2.40, 1.85 < d0s / D2s < 2.65;

[0123] Wherein, D2m is the outer diameter of the image side of the second spacer P2, d3s is the inner diameter of the object side of the third spacer P3, d0s is the inner diameter of the object side of the lens barrel P0, and D2s is the outer diameter of the object side of the second spacer P2.

[0124] In this way, it is beneficial to improve the assembly stability and structural reliability of the optical imaging lens. First, the outer diameter of the side surface of the second spacer element P2 reflects the position where the object side of the third lens E3 abuts, and the inner diameter of the object side of the third spacer element P3 reflects the position where the image side of the third lens E3 abuts. The smaller the angle between the connecting line of the three and the optical axis direction, the better the assembly stability of the lens. Secondly, the inner diameter of the object side of the lens barrel P0 affects the outer diameter size of the first lens E1, and the outer diameter of the object side of the second spacer element P2 reflects the inner diameter size of the first lens E1. Reasonably controlling the sizes of the two can ensure the excellent processability of the first lens E1 while also ensuring that the lens has strong physical strength, ensuring that the lens can work under relatively harsh conditions.

[0125] Preferably, the optical imaging lens further satisfies: 1.71 ≤ D2m / d3s ≤ 2.36, 1.88 ≤ d0s / D2s ≤ 2.62.

[0126] As Figure 7B shown, in some embodiments of the present application, each lens of the lens group has an outer peripheral surface located between the object side and the image side. The outer peripheral surface of the first lens E1 is parallel to the optical axis of the optical imaging lens, and the outer peripheral surface of the first lens E1 is in contact with the inner wall of the lens barrel P0. The optical imaging lens further satisfies: 0.14 mm < SP1 < 0.3 mm;

[0127] wherein, SP1 is the contact length between the outer peripheral surface of the first lens E1 and the inner wall of the lens barrel P0 along the optical axis direction.

[0128] In this way, restricting SP1 is beneficial to controlling the assembly difficulty and the effect after assembly. When this length is too long, it will cause a large resistance during lens assembly, making it difficult to assemble in place, increasing the risk of lens assembly tilt, and the too long contact length will also encroach on the length of the first lens E1 for dispensing and fixing, resulting in the overall push-off force of the lens being difficult to reach the standard; while when this length is too short, there is no certain pre-tightening force after lens assembly, making it easy to drop during production line circulation, and since the first lens E1 is the last one to be assembled, the cumulative tolerance of the subsequent lenses and spacer elements may cause the first lens E1 to be unable to be installed in the lens barrel P0.

[0129] Preferably, the optical imaging lens further satisfies: 0.16 mm ≤ SP1 ≤ 0.28 mm.

[0130] In some embodiments of the present application, the optical imaging lens further satisfies: 1.15 < (OD1 - OD2) / (D2s - d0m) < 3.15;

[0131] Among them, OD1 is the maximum outer diameter of the first lens E1, OD2 is the maximum outer diameter of the second lens E2, D2s is the outer diameter of the object side of the second spacer element P2, and d0m is the inner diameter of the image side of the lens barrel P0.

[0132] In this way, first, considering that the fisheye lens needs to ensure sufficient light reception at a wide angle, the volume of the first lens E1 should be slightly larger; second, considering that the second lens E2 is an injection-molded product, when the outer diameter is too large, the lens molding is poor, and problems such as poor surface shape and severe weld lines are likely to occur; third, considering that the other lenses except the first lens E1 only need to optimize and correct light and do not need to receive external light, the aperture does not need to be too large, mainly meeting the requirements of lens stacking and support, and ensuring good support stability during lens assembly. Therefore, the gap between the second spacer element P2 and the inner diameter of the image side of the lens barrel P0 cannot be too large.

[0133] Preferably, the optical imaging lens further satisfies: 1.19 ≤ (OD1 - OD2) / (D2s - d0m) ≤ 3.14.

[0134] In some embodiments of the present application, the optical imaging lens further satisfies: 3.05 ≤ (OD1 - OD2) / (OD2 - D0m) < 6.05;

[0135] OD1 is the maximum outer diameter of the first lens E1, OD2 is the maximum outer diameter of the second lens E2, and D0m is the outer diameter of the image side of the lens barrel P0.

[0136] In this way, it can ensure both sufficient brightness of the picture and the assembly stability of the lens. The fisheye lens needs to capture light at an extremely wide angle to achieve ultra-wide-angle imaging, and a larger outer diameter can provide a wider light-transmitting aperture, allowing more light at different angles to enter the lens, thus ensuring sufficient light for imaging in an ultra-wide-angle field of view and avoiding vignetting or insufficient light in the picture; the outer diameter of the second lens E2 cannot be arbitrarily enlarged due to the influence of lens injection molding. The gap between the outer diameter of the image side of the lens barrel P0 and the outer diameter of the second lens E2 reflects the misalignment amount of the support except for the first lens E1. Reasonably controlling these two variables can ensure the assembly stability of the lens and improve the production yield of the lens.

[0137] Preferably, the optical imaging lens further satisfies: 3.05 ≤ (OD1 - OD2) / (OD2 - D0m) ≤ 6.02.

[0138] In some embodiments of the present application, the fifth lens E5 is glued to the sixth lens E6. The spacer assembly further includes a fifth spacer element P5 disposed on the image side of the fifth lens E5 and in contact with the image side surface of the fifth lens E5. The inner diameter of the image side surface of the lens barrel P0 is smaller than the inner diameter of the fifth spacer element P5, and the image side surface of the fifth spacer element P5 is also in contact with the inner wall of the lens barrel P0. The optical imaging lens further satisfies: 0.68 ≤ EP45 / (CT5 + CT6) ≤ 0.80;

[0139] Wherein, EP45 is the distance along the optical axis from the image side surface of the fourth spacer element P4 to the object side surface of the fifth spacer element P5, CT5 is the central thickness of the fifth lens E5, and CT6 is the central thickness of the sixth lens E6.

[0140] In this way, it is beneficial to avoid the welding mark problem during lens molding. The distance along the optical axis from the image side surface of the fourth spacer element P4 to the object side of the fifth spacer element P5 reflects the thickness of the structural edge of the fifth lens E5. Since the fifth lens E5 has a structure with a thin center and thick edges, it is necessary to reasonably control the two variables to avoid the welding mark problem during lens molding. The mutual cooperation between the central thickness of the sixth lens E6 and the central thickness of the fifth lens E5 affects the effect of the lens in improving chromatic aberration.

[0141] According to another aspect of the present application, the present application further provides an optical imaging lens, including a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6; the spacer assembly includes a second spacer element P2 disposed on the image side of the second lens E2 and in contact with the image side surface of the second lens E2, and a third spacer element P3 disposed on the image side of the third lens E3 and in contact with the image side surface of the third lens E3; a fourth spacer element P4 disposed on the image side of the fourth lens E4 and in contact with the image side surface of the fourth lens E4; a fifth spacer element P5 disposed on the image side of the fifth lens E5 and in contact with the image side surface of the fifth lens E5; the fifth lens E5 is glued to the sixth lens E6; the image side surface of the fifth spacer element P5 is in contact with the inner wall of the lens barrel; the optical imaging lens further satisfies: 0.40 < (D5m - d5m) / CP5 < 1.55 and 0.68 ≤ EP45 / (CT5 + CT6) ≤ 0.80;

[0142] Wherein, D5m is the inner and outer diameter of the image side surface of the fifth spacer element P5, d5m is the inner diameter of the image side surface of the fifth spacer element P5, CP5 is the maximum thickness of the fifth spacer element P5, EP45 is the distance between the fourth spacer element P4 and the fifth spacer element P5 in the optical axis direction, CT5 is the central thickness of the fifth lens E5, and CT6 is the central thickness of the sixth lens E6.

[0143] In summary, the optical imaging lens provided in this application is composed of six lenses, wherein the fifth lens E5 and the sixth lens E6 are cemented, the object side surface of the fifth spacer element contacts the image side surface of the fifth lens E5, and the image side surface of the fifth spacer element P5 contacts the inner wall of the lens barrel; since the fifth spacer element P5 affects the stability of the upper and lower bearing of the fifth lens E5 to a certain extent, by restricting the maximum thickness of the fifth spacer element P5 and the contact area between the image side surface of the fifth spacer element P5 and the lens barrel, it is beneficial to improve the bearing stability; further, the distance from the image side of the fourth spacer element P4 to the object side of the fifth spacer element P5 along the optical axis direction reflects the thickness of the structural edge of the fifth lens E5. Since the fifth lens E5 has a structure that is thin in the center and thick at the edges, by reasonably controlling the central thickness and the edge thickness, the problem of welding marks during the molding of the fifth lens E5 can be avoided.

[0144] It should be noted that those skilled in the art should understand that without departing from the technical solution required to be protected in this application, the number of spacer elements constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification, and this application does not make specific limitations thereto. For example, according to needs, the optical imaging lens may also include other numbers of spacer elements different from those described in the above embodiments.

[0145] The following describes some specific but non-limiting embodiments of the above embodiments of this application in more detail with reference to the accompanying drawings. For the convenience of description, in the following embodiments, OBJ represents the object surface of the optical imaging lens, STO represents the surface of the aperture stop, S1 and S2 respectively represent the object side surface and the image side surface of the first lens E1, S3 and S4 respectively represent the object side surface and the image side surface of the second lens E2, S5 and S6 respectively represent the object side surface and the image side surface of the third lens E3, S7 and S8 respectively represent the object side surface and the image side surface of the fourth lens E4, S9 and S10 respectively represent the object side surface and the image side surface of the fifth lens E5, S11 and S12 respectively represent the object side surface and the image side surface of the sixth lens E6, S13 and S14 are the object side surface and the image side surface of the filter on the photosensitive chip, and S15 is the photosensitive surface of the photosensitive chip.

[0146] The aspheric surface in this application satisfies the following formula:

[0147] ;

[0148] Wherein, When the aspherical surface is at a position with a height of h along the optical axis direction, it is the sagitta, the distance from the vertex of the aspherical surface; 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 constant; Ai is the correction coefficient of the i-th order of the aspherical surface.

[0149] It should be noted that the differences between the following three embodiments lie in the different optical parameters of the lenses, and the differences between multiple working conditions in the embodiments lie in the different partial parameters of the lens barrel and the spacer elements.

[0150] Embodiment 1

[0151] As Figures 1A to 1C shown, Figures 1A to 1C They are respectively the structural schematic diagrams of three working conditions 1-1, 1-2, and 1-3 in Embodiment 1.

[0152] In this embodiment, the object side surface of the first lens E1 is convex, the image side surface of the first lens E1 is concave, the object side surface of the second lens E2 is convex, the image side surface of the second lens E2 is concave, the object side surface of the third lens E3 is concave, the image side surface of the third lens is convex, the object side surface of the fourth lens E4 is convex, the image side surface of the fourth lens is convex, the object side surface of the fifth lens E5 is concave, the image side surface of the fifth lens E5 is concave, the object side surface of the sixth lens E6 is convex, and the image side surface of the sixth lens E6 is convex.

[0153] In this embodiment, the optical power of the first lens E1 is negative, the optical power of the second lens E2 is negative, the optical power of the third lens E3 is positive, the optical power of the fourth lens E4 is positive, the optical power of the fifth lens E5 is negative, and the optical power of the sixth lens E6 is positive.

[0154] In this embodiment, the object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface of the second lens E2 and the object side surface of the third lens E3, the object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface of the third lens E3 and the object side surface of the fourth lens E4, the object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5, the object side surface of the fifth spacer element P5 is in contact with the image side surface of the fifth lens E5, and the lens barrel P0 also has a stop ring located at the image side end face and extending inward, and the image side surface of the fifth spacer element P5 is in contact with the object side surface of the stop ring.

[0155] In summary, the partial structural parameters of the lens barrel and the spacer elements of the optical imaging lens in Embodiment 1 under working conditions 1-1, 1-2, and 1-3 are shown in Table 8 below.

[0156] Table 1 gives the lens optical parameters of the optical imaging lens in Embodiment 1. Among them, the units of the radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0157] Table 1 Basic optical parameters of the optical imaging lens in Embodiment 1

[0158]

[0159] It should be noted that the materials in Table 1 include refractive index and Abbe number. For example, the data in the third row and fifth column of Table 1 indicate that the refractive index of the first lens E1 is 1.772 and the Abbe number is 49.61.

[0160] The aspherical coefficients of the lenses in Embodiment 1 are shown in Table 2.

[0161] Table 2 Aspherical coefficient table of the optical imaging lens in Embodiment 1

[0162]

[0163] The axial chromatic aberration curve of the optical imaging lens in Embodiment 1 is as Figure 2A shown, which represents the degree of deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging lens; the astigmatism curve of the optical imaging lens in Embodiment 1 is as Figure 2B shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. The relative illumination curve of the optical imaging lens in Embodiment 1 is as Figure 2C shown. According to Figure 2A , Figure 2B that is Figure 2C it can be seen that the optical imaging lens in Embodiment 1 can achieve good imaging quality.

[0164] Embodiment 2

[0165] As Figures 3A to 3C shown, Figures 3A to 3C are respectively the structural schematic diagrams of the three working conditions 2-1, 2-2, and 2-3 in Embodiment 2.

[0166] In this embodiment, the object side of the first lens E1 is convex, the image side of the first lens E1 is concave, the object side of the second lens E2 is concave, the image side of the second lens E2 is concave, the object side of the third lens E3 is concave, the image side of the third lens E3 is convex, the object side of the fourth lens E4 is convex, the image side of the fourth lens E4 is convex, the object side of the fifth lens E5 is concave, the image side of the fourth lens E4 is concave, the object side of the sixth lens E6 is convex, and the image side of the sixth lens E6 is convex.

[0167] In this embodiment, the optical power of the first lens E1 is negative, the optical power of the second lens E2 is negative, the optical power of the third lens E3 is positive, the optical power of the fourth lens E4 is positive, the optical power of the fifth lens E5 is negative, and the optical power of the sixth lens E6 is positive.

[0168] In this embodiment, the object side and the image side of the second spacer element P2 are in contact with the image side of the second lens E2 and the object side of the third lens E3 respectively. The object side and the image side of the third spacer element P3 are in contact with the image side of the third lens E3 and the object side of the fourth lens E4 respectively. The object side and the image side of the fourth spacer element P4 are in contact with the image side of the fourth lens E4 and the object side of the fifth lens E5 respectively. The object side of the fifth spacer element P5 is in contact with the image side of the fifth lens E5. The lens barrel P0 further has a stop ring located at the image-side end face and extending inwardly, and the image side of the fifth spacer element P5 is in contact with the object side of the stop ring.

[0169] In summary, for the optical imaging lens of Embodiment 2, some structural parameters of the lens barrel and the spacer elements under operating conditions 2-1, 2-2, and 2-3 are shown in Table 8 below.

[0170] Table 3 gives the lens optical parameters of the optical imaging lens in Embodiment 2. Among them, the units of the radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0171] Table 3 Basic Optical Parameter Table of the Optical Imaging Lens of Embodiment 2

[0172]

[0173] It should be noted that the materials in Table 3 include the refractive index and the Abbe number. For example, the data in the third row and the fifth column of Table 3 indicate that the refractive index of the first lens E1 is 1.772 and the Abbe number is 49.61.

[0174] The aspheric coefficients of the lenses in Embodiment 2 are shown in Table 4.

[0175] Table 4 Aspheric Coefficient Table of the Optical Imaging Lens of Embodiment 2

[0176]

[0177] The axial chromatic aberration curve of the optical imaging lens in Embodiment 2 is as Figure 4A shown, which represents the deviation degree of the convergence points of light rays with different wavelengths after passing through the optical imaging lens; the astigmatism curve of the optical imaging lens in Embodiment 2 is as Figure 4B shown, which represents the curvature degree of the meridional image plane and the sagittal image plane. The relative illumination curve of the optical imaging lens in Embodiment 2 is as Figure 4C shown. According to Figure 4A , Figure 4B that is Figure 4C it can be seen that the optical imaging lens in Embodiment 2 can achieve good imaging quality.

[0178] Embodiment 3

[0179] AsFigures 5A to 5C As shown Figures 5A to 5C are respectively the structural schematic diagrams under three working conditions of Embodiment 3: 3-1, 3-2, and 3-3.

[0180] In this embodiment, the object side of the first lens E1 is convex, the image side of the first lens E1 is concave, the object side of the second lens E2 is concave, the image side of the second lens E2 is concave, the object side of the third lens E3 is concave, the image side of the third lens E3 is convex, the object side of the fourth lens E4 is convex, the image side of the fourth lens E4 is convex, the object side of the fifth lens E5 is concave, the image side of the fifth lens E5 is concave, the object side of the sixth lens E6 is convex, and the image side of the sixth lens E6 is convex.

[0181] In this embodiment, the optical power of the first lens E1 is negative, the optical power of the second lens E2 is negative, the optical power of the third lens E3 is positive, the optical power of the fourth lens E4 is positive, the optical power of the fifth lens E5 is negative, and the optical power of the sixth lens E6 is positive.

[0182] In this embodiment, the object side and the image side of the second spacer element P2 are respectively in contact with the image side of the second lens E2 and the object side of the third lens E3, the object side and the image side of the third spacer element P3 are respectively in contact with the image side of the third lens E3 and the object side of the fourth lens E4, the object side and the image side of the fourth spacer element P4 are respectively in contact with the image side of the fourth lens E4 and the object side of the fifth lens E5, the object side of the fifth spacer element P5 is in contact with the image side of the fifth lens E5, the lens barrel P0 further has a stop ring located at the image-side end face and extending inward, and the image side of the fifth spacer element P5 is in contact with the object side of the stop ring.

[0183] In summary, for the optical imaging lens of Embodiment 3, some structural parameters of the lens barrel and the spacer elements under working conditions 3-1, 3-2, and 3-3 are shown in Table 8 below.

[0184] Table 5 gives the lens optical parameters of the optical imaging lens in Embodiment 3. Among them, the units of the radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0185] Table 5 Basic Optical Parameter Table of the Optical Imaging Lens of Embodiment 3

[0186]

[0187] It should be noted that the materials in Table 5 include the refractive index and the Abbe number. For example, the data in the third row and the fifth column of Table 5 indicate that the refractive index of the first lens E1 is 1.883 and the Abbe number is 40.87.

[0188] The aspheric coefficients of the lenses in Embodiment 3 are shown in Table 6.

[0189] Table 6 Aspherical Coefficient Table of the Optical Imaging Lens in Embodiment 3

[0190]

[0191] The axial chromatic aberration curve of the optical imaging lens in Embodiment 3 is as shown in Figure 6A shown, which represents the degree of deviation of the focus points of light rays of different wavelengths after passing through the optical imaging lens; the astigmatism curve of the optical imaging lens in Embodiment 3 is as shown in Figure 6B shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. The relative illumination curve of the optical imaging lens in Embodiment 3 is as shown in Figure 6C shown. According to Figure 6A , Figure 6B that is Figure 6C it can be known that the optical imaging lenses in Embodiment 3 can all achieve good imaging quality.

[0192] In Embodiments 1 to 3, the effective focal lengths f1 to f4 of the first lens E1 to the fourth lens E4 in the optical imaging lens, the combined focal length f56 of the fifth lens E5 and the sixth lens E6 in the optical imaging lens, the effective focal length f of the optical imaging lens, half of the maximum field of view Semi-FOV of the optical imaging lens, and the aperture coefficient FNO of the optical imaging lens are shown in Table 7 respectively:

[0193] Table 7 Optical Parameter Table of the Optical Imaging Lens

[0194]

[0195] In addition, the partial structural parameters of the optical imaging lens under different working conditions in Embodiments 1 to 3 are specifically shown in Table 8.

[0196] Table 8 Partial Structural Parameter Table of the Optical Imaging Lens

[0197]

[0198] In summary, the optical imaging lenses in Embodiments 1 to 3 satisfy the relational expressions in Table 9, as shown in the following table.

[0199] Table 9 Relational Expression Table Satisfied in the Optical Imaging Lens

[0200]

[0201] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0202] The above embodiments only illustrate several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An optical imaging lens, characterized in that: It includes a lens barrel, a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power and a sixth lens with a positive optical power, wherein the central thickness of the third lens is greater than that of any other lens, the object side surface of the first lens is convex and the image side surface is concave, the object side surface of the third lens is concave and the image side surface is convex; the spacer assembly includes a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens and a third spacer element placed on the image side of the third lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: 7.00 < L / (f×tan(Semi - FOV / 2)) < 7.77; 2.45 < (d0s - D3s) / d3s < 3.00; and 1.83 < R5 / R6 + EP23 / CT3 < 2.30; wherein, L is the maximum height of the lens barrel; f is the effective focal length of the optical imaging lens; Semi - FOV is half of the maximum field of view angle of the optical imaging lens; d0s is the inner diameter of the object side surface of the lens barrel; D3s is the outer diameter of the object side surface of the third spacer element; d3s is the inner diameter of the object side surface of the third spacer element; R5 is the curvature radius of the object side surface of the third lens; R6 is the curvature radius of the image side surface of the third lens; EP23 is the distance between the second spacer element and the third spacer element along the optical axis direction; CT3 is the central thickness of the third lens.

2. The optical imaging lens according to claim 1, wherein The optical imaging lens further satisfies: -10.85 < (f1 + f2) / f < -9.90, 1.75 < EP02 / CT1 < 2.65; wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f is the effective focal length of the optical imaging lens, EP02 is the distance between the object side end face of the lens barrel and the object side surface of the second spacer element along the optical axis direction, CT1 is the central thickness of the first lens.

3. The optical imaging lens according to claim 1, wherein The optical imaging lens further satisfies: -4.90 < f2 / f < -4.35, 2.35 < |(R3 + R4)| / SG21 < 12.45; wherein, f2 is the effective focal length of the second lens, f is the effective focal length of the optical imaging lens, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, SG21 is the distance between the intersection point of the object side surface of the effective diameter region of the second lens and the optical axis and the object side surface of the non - effective diameter region of the second lens along the optical axis direction.

4. The optical imaging lens according to claim 3, wherein, The optical imaging lens further includes a fourth spacer element placed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and the optical imaging lens further satisfies: 3.40 < (CP4 + CP3) / (T34 + T45) < 5.70; Wherein, CP4 is the maximum thickness of the fourth spacer element, CP3 is the maximum thickness of the third spacer element, T34 is the air gap between the third lens and the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

5. The optical imaging lens according to claim 1, wherein The optical imaging lens further satisfies: 0.65 < (CP2 + CP3) / EP23 < 1.87; Wherein, CP2 is the maximum thickness of the second spacer element, CP3 is the maximum thickness of the third spacer element, and EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis.

6. The optical imaging lens according to claim 1, wherein, The optical imaging lens further satisfies: 1.60 < (T12 + T23) / EP02 < 2.32; Wherein, T12 is the air gap between the first lens and the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and EP02 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the second spacer element.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 2.70 ≤ D0s / D0m × FNO < 4.00; Wherein, D0s is the outer diameter of the object-side surface of the lens barrel, D0m is the outer diameter of the image-side surface of the lens barrel, and FNO is the f-number of the optical imaging lens.

8. The optical imaging lens according to claim 1, wherein The optical imaging lens further satisfies: 0.38 < (T12 + T23) / L < 0.47; Wherein, T12 is the air gap between the first lens and the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and L is the maximum height of the lens barrel.

9. The optical imaging lens according to claim 8, characterized in that, The optical imaging lens further satisfies: 1.70 < D2m / d3s < 2.40, 1.85 < d0s / D2s < 2.65; Wherein, D2m is the outer diameter of the image-side surface of the second spacer element, d3s is the inner diameter of the object-side surface of the third spacer element, d0s is the inner diameter of the object-side surface of the lens barrel, and D2s is the outer diameter of the object-side surface of the second spacer element.

10. The optical imaging lens according to claim 1, wherein Each lens of the lens group further has an outer peripheral surface located between the object-side surface and the image-side surface. The outer peripheral surface of the first lens is parallel to the optical axis of the optical imaging lens, and the outer peripheral surface of the first lens is in contact with the inner wall of the lens barrel. The optical imaging lens further satisfies: 0.14mm < SP1 < 0.3mm; Wherein, SP1 is the contact length along the optical axis between the outer peripheral surface of the first lens and the inner wall of the lens barrel.

11. The optical imaging lens according to any one of claims 1 to 10, characterized in that, The optical imaging lens further satisfies: 1.15 < (OD1 - OD2) / (D2s - d0m) < 3.15; Wherein, OD1 is the maximum outer diameter of the first lens, OD2 is the maximum outer diameter of the second lens, D2s is the outer diameter of the object-side surface of the second spacer element, and d0m is the inner diameter of the image-side surface of the lens barrel.

12. The optical imaging lens according to any one of claims 1 to 10, characterized in that, The optical imaging lens further satisfies: 3.05 ≤ (OD1 - OD2) / (OD2 - D0m) < 6.05; OD1 is the maximum outer diameter of the first lens, OD2 is the maximum outer diameter of the second lens, and D0m is the outer diameter of the image-side surface of the lens barrel.

13. The optical imaging lens according to any one of claims 1 to 10, characterized in that, The fifth lens is cemented to the sixth lens. The spacer assembly further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens. The inner diameter of the image side surface of the lens barrel is smaller than the inner diameter of the fifth spacer element, and the image side surface of the fifth spacer element is further in contact with the inner wall of the lens barrel. The optical imaging lens further satisfies: 0.68 ≤ EP45 / (CT5 + CT6) ≤ 0.80; wherein, EP45 is the distance along the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, CT5 is the central thickness of the fifth lens, and CT6 is the central thickness of the sixth lens.

14. The optical imaging lens according to claim 13, wherein The image side surface of the second lens is concave, the object side surface of the fourth lens is convex, the image side surface of the fourth lens is convex, the object side surface of the fifth lens is concave, the image side surface of the fifth lens is concave, and the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex.

Images