Optical imaging system

Abstract

An optical imaging system is disclosed. The optical imaging system includes a lens group, a plurality of spacer elements, and a lens barrel for accommodating the lens group and the plurality of spacer elements. The lens group includes, in order from an object side to an image side along an optical axis, a first lens having a refractive power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein a surface of at least one lens among the first lens to the sixth lens has a point of inflection, and a number of lenses having a refractive power in the lens group is six. The plurality of spacer elements includes a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The optical imaging system satisfies: -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60°, and 0 < d1s / f1 < 0.5.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular, to an optical imaging system. BACKGROUND

[0002] In recent years, with the progress of science and technology, portable electronic devices such as smart phones have been continuously iterated and developed. As an important part of improving the performance of mobile phones, the imaging performance of mobile phone camera technology is also continuously improved. At present, the main camera lens of the mainstream mobile phone usually tends to select a wide-angle lens with high imaging quality and large field of view, but this characteristic is also a design difficulty of the wide-angle lens.

[0003] In addition, in the design process of the wide-angle lens, the first lens closest to the object side plays an important role, such as needing to receive as much light as possible on the object side to improve the light throughput of the lens, having a uniform structure to reduce its sensitivity, and saving the space ratio of the lens as much as possible.

[0004] Therefore, how to design an optical imaging system with at least one of the characteristics of a large field of view, high imaging quality, and low sensitivity has become one of the problems to be solved by many lens designers. SUMMARY

[0005] The present application provides an optical imaging system, which comprises a lens group, a plurality of spacer elements, and a lens barrel for accommodating the lens group and the plurality of spacer elements in order from the object side to the image side along an optical axis. The lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens with optical power in order from the object side to the image side along the optical axis, wherein at least one lens surface of the first lens to the sixth lens has an inflection point, and the number of lenses with optical power in the lens group is six. The plurality of spacer elements comprises: a first spacer element located on the image side of the first lens and partially in contact with the image side surface of the first lens; a second spacer element located on the image side of the second lens and partially in contact with the image side surface of the second lens; a third spacer element located on the image side of the third lens and partially in contact with the image side surface of the third lens; a fourth spacer element located on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens; and a fifth spacer element located on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens. The optical imaging system can satisfy -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60°, and 0 < d1s / f1 < 0.5, wherein f1 is the effective focal length of the first lens, R1 is the curvature radius of the object side surface of the first lens, Semi-FOV is half of the maximum field of view angle of the optical imaging system, and d1s is the inner diameter of the object side surface of the first spacer element.

[0006] In one embodiment, at least one of the lens surfaces from the object side surface of the first lens to the image side surface of the sixth lens is a non-spherical lens surface.

[0007] In one embodiment, the optical imaging system can satisfy: 5.0 < (f3 / N3 - f4 / N4) / EP34 < 10.0, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, N3 is the refractive index of the third lens, N4 is the refractive index of the fourth lens, and EP34 is the separation distance in the direction along the optical axis from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element.

[0008] In one embodiment, the optical imaging system can satisfy: 0 < f3 / f < 1.0, -5.0 < f4 / f < 0, and 1.0 < f34 / (d4s - d3s) < 5.0, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f is the total effective focal length of the optical imaging system, f34 is the combined focal length of the third lens and the fourth lens, d3s is the inner diameter of the object-side surface of the third spacer element, and d4s is the inner diameter of the object-side surface of the fourth spacer element.

[0009] In one embodiment, the optical imaging system can satisfy: -5.0 < R2 / R3 < 0 and 5.0 < EP12 / T12 < 11.0, where R2 is the radius of curvature of the image-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, EP12 is the separation distance in the direction along the optical axis from the image-side surface of the first spacer element to the object-side surface of the second spacer element, and T12 is the air separation of the first lens and the second lens in the direction along the optical axis.

[0010] In one embodiment, the optical imaging system can satisfy: -5.0 < f2 / L < -1.0, where f2 is the effective focal length of the second lens, and L is the separation distance in the direction along the optical axis from the object-side end of the lens barrel to the image-side end of the lens barrel.

[0011] In one embodiment, the optical imaging system can satisfy: 0 < d2s x 2 / (d1s + d3s) < 0.7, where d1s is the inner diameter of the object-side surface of the first spacer element, d2s is the inner diameter of the object-side surface of the second spacer element, and d3s is the inner diameter of the object-side surface of the third spacer element.

[0012] In one embodiment, the optical imaging system can satisfy: 0.5 < R3 / R4 - R4 / R5 < 1.5 and 4.0 mm < (D3s - D2s) / (R4 / R5) < 11.0 mm, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, R5 is the radius of curvature of the object-side surface of the third lens, D2s is the outer diameter of the object-side surface of the second spacer element, and D3s is the outer diameter of the object-side surface of the third spacer element.

[0013] In one embodiment, the optical imaging system can satisfy: 1.01 < N4 / N5 < 1.5 and -20.0 < f4 / EP45 < -5.0, where N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, f4 is the effective focal length of the fourth lens, and EP45 is the separation distance of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction along the optical axis.

[0014] In one embodiment, the optical imaging system can satisfy: -1.0 < (T34+EP34) / R6 < 0 and -1.5 < (T34+EP34) / R7 < 0, where T34 is the air separation of the third lens and the fourth lens in the direction along the optical axis, EP34 is the separation distance of the image side surface of the third spacer element to the object side surface of the fourth spacer element in the direction along the optical axis, R6 is the radius of curvature of the image side surface of the third lens, and R7 is the radius of curvature of the object side surface of the fourth lens.

[0015] In one embodiment, the optical imaging system can satisfy: -2.0 < (EP45 x V5) / (f5 x N5) < 1.0, where EP45 is the separation distance of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction along the optical axis, N5 is the refractive index of the fifth lens, V5 is the Abbe number of the fifth lens, and f5 is the effective focal length of the fifth lens.

[0016] In one embodiment, the optical imaging system can satisfy: 0.10 < d5s / f6 < 1.0, where d5s is the inner diameter of the object side surface of the fifth spacer element, and f6 is the effective focal length of the sixth lens.

[0017] In one embodiment, the optical imaging system can satisfy: 1.0 < (EP45+CP5) / (CT5+T56) < 1.5, where EP45 is the separation distance of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction along the optical axis, CP5 is the maximum thickness of the fifth spacer element in the direction along the optical axis, CT5 is the central thickness of the fifth lens in the direction along the optical axis, and T56 is the air separation of the fifth lens and the sixth lens in the direction along the optical axis.

[0018] In one embodiment, the optical imaging system can satisfy: -5.0 < d5s / R10+d5m / R11 < 10.0, where d5s is the inner diameter of the object side surface of the fifth spacer element, d5m is the inner diameter of the image side surface of the fifth spacer element, R10 is the radius of curvature of the image side surface of the fifth lens, and R11 is the radius of curvature of the object side surface of the sixth lens.

[0019] In an embodiment, the image side surface of at least three lenses among the first lens to the fifth lens is convex, wherein the image side surface of the ith lens is convex, the optical imaging system can satisfy: 1.01 mm < Dis-dis < 5.00 mm, Dis is the outer diameter of the object side surface of the ith spacer element, dis is the inner diameter of the object side surface of the ith spacer element, i is selected from 1, 2, 3, 4 or 5.

[0020] In an embodiment, the plurality of spacer elements further comprises a fifth auxiliary spacer element located on the image side of the fifth spacer element and partially in contact with the image side surface of the fifth spacer element, the optical imaging system can satisfy: 0.3 < d5bm / f56 < 2.0, wherein d5bm is the inner diameter of the image side surface of the fifth auxiliary spacer element, f56 is the combined focal length of the fifth lens and the sixth lens.

[0021] In an embodiment, the surface of at least one lens among the first lens to the third lens has an inflection point.

[0022] In an embodiment, the image side surface of the first lens has an inflection point, the optical imaging system can satisfy: 0.2 < Yc12 / (D1s-d1s) < 1.5, wherein Yc12 is the distance between the inflection point on the image side surface of the first lens and the intersection of the image side surface of the first lens and the optical axis in the direction perpendicular to the optical axis, D1s is the outer diameter of the object side surface of the first spacer element, d1s is the inner diameter of the object side surface of the first spacer element.

[0023] In an embodiment, the optical imaging system can satisfy: DT21 < DT12 < DT51 and 4.0 < d5s / d2s < 5.0, wherein DT12 is the maximum effective radius of the image side surface of the first lens, DT21 is the maximum effective radius of the object side surface of the second lens, DT51 is the maximum effective radius of the object side surface of the fifth lens, d2s is the inner diameter of the object side surface of the second spacer element, d5s is the inner diameter of the object side surface of the fifth spacer element.

[0024] In an embodiment, the first lens has positive refractive power, the object side surface thereof is concave, and the image side surface thereof is convex; the second lens has negative refractive power, the object side surface thereof is convex, and the image side surface thereof is concave; the third lens has positive refractive power, the object side surface thereof is convex, and the image side surface thereof is convex; the fourth lens has negative refractive power, the object side surface thereof is concave, and the image side surface thereof is convex; the object side surface of the fifth lens is concave, and the image side surface thereof is convex; and the sixth lens has positive refractive power, and the image side surface thereof is concave.

[0025] In the exemplary embodiments of the present application, by reasonably arranging six lens pieces, multiple spacer elements, and a lens barrel, and by matching -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60°, and 0 < d1s / f1 < 0.5, it is beneficial to make the optical imaging system have better field curvature consistency and higher imaging quality on the basis of having a large field of view. For example, by reasonably matching the lens barrel, the number of lens pieces, and the spacer elements, etc., it is beneficial to design a miniaturized optical imaging system. On this basis, by controlling Semi-FOV within a certain range such as 45° < Semi-FOV < 60°, the system can meet the characteristics of a large field of view. In addition, by setting -5.0 < f1 / R1 < 0, the structure of the first lens can be reasonably optimized to improve the light throughput of the system. On the basis of ensuring that the system has good performance and structural requirements, by setting 0 < d1s / f1 < 0.5, the problem of abnormal field curvature of the system can be reduced, so that the field curvature consistency of the system is better, thereby being beneficial to improve the quality and yield of the system and to improve the reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0027] Figure 1 is a structural schematic diagram of an optical imaging system of Example 1;

[0028] Figure 2 is a structural schematic diagram of an optical imaging system of Example 2;

[0029] Figure 3 is a structural schematic diagram of an optical imaging system of Example 3;

[0030] Figures 4A to 4D respectively show the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve of the optical imaging system of Example 1 to Example 3;

[0031] Figure 5 is a structural schematic diagram of an optical imaging system of Example 4;

[0032] Figure 6 is a structural schematic diagram of an optical imaging system of Example 5;

[0033] Figure 7 is a structural schematic diagram of an optical imaging system of Example 6;

[0034] Figures 8A to 8D respectively show the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve of the optical imaging system of Example 4 to Example 6;

[0035] Figure 9 is a structural schematic diagram of an optical imaging system of Embodiment 7;

[0036] Figure 10 is a structural schematic diagram of an optical imaging system of Embodiment 8;

[0037] Figure 11 is a structural schematic diagram of an optical imaging system of Embodiment 9;

[0038] Figures 12A to 12D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves of the optical imaging systems of Embodiments 7 to 9;

[0039] Figure 13 is a partial parameter schematic diagram of an optical imaging system according to an embodiment of the present application;

[0040] Figure 14 shows a modulation transfer function (MTF) performance detection curve diagram of an optical imaging system of the present application;

[0041] Figure 15 shows a MTF performance detection curve diagram of another optical imaging system of the present application; and

[0042] Figure 16 shows a MTF performance detection curve diagram of still another optical imaging system of the present application. DETAILED DESCRIPTION

[0043] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numbers refer to the same elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0044] It should be noted that in the present specification, the expressions first, second, third and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens, and the first spacing element can also be referred to as the second spacing element or the third spacing element, without departing from the teachings of the present application.

[0045] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale. It should be understood that the thickness, size, and shape of the spacer members and the lens barrel have also been exaggerated slightly in the drawings for ease of explanation.

[0046] In this document, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens. It should be understood that the surface of each spacer member closest to the object is referred to as the object side surface of the spacer member, and the surface of each spacer member closest to the image plane is referred to as the image side surface of the spacer member. The surface of the lens barrel closest to the object is referred to as the object side end of the lens barrel, and the surface of the lens barrel closest to the image plane is referred to as the image side end of the lens barrel.

[0047] It should also be understood that the use of the terms "including", "comprising", "having" "with" and / or "contains", when used in this specification, specify the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to mean an example or an illustration.

[0048] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is 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.

[0049] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The following embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but can not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. For example, the lens group (i.e. the first lens to the sixth lens), the barrel structure and the spacer element in each embodiment of the present application can be combined arbitrarily, and are not limited to the combination of the lens group, the barrel structure, the spacer element and the like in the embodiment. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] The features, principles and other aspects of the present application are described in detail below.

[0051] The optical imaging system according to the exemplary embodiments of the present application can include six lenses with optical power, i.e. the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens. The six lenses are arranged in order along the optical axis from the object side to the image side. Any two adjacent lenses among the first lens to the sixth lens can have a spacer distance. Any lens among the first lens to the sixth lens can have a center thickness on the optical axis.

[0052] According to the exemplary embodiments of the present application, the first lens to the sixth lens can each have an optical region for optical imaging and a non-optical region extending outward from the periphery of the optical region. Generally, the optical region refers to the region of the lens for optical imaging, and the non-optical region refers to the structural region of the lens. In the assembly process of the optical imaging system, the spacer element can be arranged at the non-optical region of each lens by a process such as point bonding, and each lens is coupled into the barrel, respectively. In the imaging process of the optical imaging system, the optical region of each lens can transmit light from the object to form an optical path and form the final optical image; and the non-optical region of each lens after assembly is accommodated in the barrel which cannot transmit light, so that the non-optical region does not directly participate in the imaging process of the optical imaging system. It should be noted that, for the convenience of description, the present application divides each lens into two parts, i.e. the optical region and the non-optical region, for description, but it should be understood that the optical region and the non-optical region of the lens can be formed as a whole in the manufacturing process, rather than as two separate parts.

[0053] In an embodiment of the present application, the optical system assembly can include at least one spacer element, for example, can include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element can be located on the image side of the first lens and partially contact the image side surface of the first lens, and can abut against the non-optical area of the image side surface of the first lens. The second spacer element can be located on the image side of the second lens and partially contact the image side surface of the second lens, and can abut against the non-optical area of the image side surface of the second lens. The third spacer element can be located on the image side of the third lens and partially contact the image side surface of the third lens, and can abut against the non-optical area of the image side surface of the third lens. The fourth spacer element can be located on the image side of the fourth lens and partially contact the image side surface of the fourth lens, and can abut against the non-optical area of the image side surface of the fourth lens. The fifth spacer element can be located on the image side of the fifth lens and partially contact the image side surface of the fifth lens, and can abut against the non-optical area of the image side surface of the fifth lens. For example, the first spacer element can contact the non-optical area of the image side surface of the first lens, and can contact the non-optical area of the object side surface of the second lens. For example, the object side surface of the first spacer element can contact the non-optical area of the image side surface of the first lens, and the image side surface of the first spacer element can contact the non-optical area of the object side surface of the second lens.

[0054] In another embodiment of the present application, the optical imaging system can further include a fifth auxiliary spacer element, which can be located on the image side of the fifth spacer element and partially contact the image side surface of the fifth spacer element.

[0055] The optical imaging system according to an exemplary embodiment of the present application can include a lens barrel accommodating the lens group and the plurality of spacer elements. For example, as shown in FIG. 1, the lens barrel can be a one-piece lens barrel for accommodating the first lens E1 to the sixth lens E6 and the first spacer element P1 to the fifth auxiliary spacer element P5b. Figure 1

[0056] According to an exemplary embodiment of the present application, the spacer element can include at least one spacer piece, and by properly setting the number, thickness, inner diameter, and outer diameter of the spacer piece, the assembly of the optical imaging system can be facilitated, stray light can be blocked, and the imaging quality of the optical imaging system can be improved.

[0057] In an exemplary embodiment, the first lens can have a positive focal power, the object side surface thereof can be concave, and the image side surface thereof can be convex; the second lens can have a negative focal power, the object side surface thereof can be convex, and the image side surface thereof can be concave; the third lens can have a positive focal power, the object side surface thereof can be convex, and the image side surface thereof can be convex; the fourth lens can have a negative focal power, the object side surface thereof can be concave, and the image side surface thereof can be convex; the fifth lens can have a positive focal power or a negative focal power, the object side surface thereof can be concave, and the image side surface thereof can be convex; and the sixth lens can have a positive focal power, and the image side surface thereof can be concave.​

[0058] In the example embodiment, the surface of at least one of the first lens to the sixth lens has an inflection point. The optical imaging system according to the present application can satisfy -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60° and 0 < d1s / f1 < 0.5, wherein f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object side surface of the first lens, Semi-FOV is half of the maximum field angle of the optical imaging system, and d1s is the inner diameter of the object side surface of the first spacer element. Figure 13

[0059] In the present application, by reasonably arranging the six lenses, the plurality of spacer elements and the lens barrel as described above and matching -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60° and 0 < d1s / f1 < 0.5, it is beneficial to make the optical imaging system have better field curvature consistency and higher imaging quality on the basis of having a large field angle. For example, by reasonably matching the lens barrel, the number of lens pieces and the spacer elements, it is beneficial to design an optical imaging system with miniaturization. On this basis, by controlling Semi-FOV within a certain range such as 45° < Semi-FOV < 60°, the system can meet the characteristics of a large field angle. In addition, by setting -5.0 < f1 / R1 < 0, the structure of the first lens can be reasonably optimized to improve the light throughput of the system. On the basis of ensuring that the system has good performance and structural requirements, by setting 0 < d1s / f1 < 0.5, the problem of abnormal field curvature of the system can be reduced, so that the field curvature consistency of the system is good, thereby being beneficial to improve the quality and yield of the system and improve the reliability of the system.

[0060] The present application has carried out multiple sets (more than 10 sets) of tests for optical imaging systems meeting different conditions respectively, and the test results of multiple sets under the same condition are not much different. The following exemplary lists the test results of several sets of optical imaging systems under different conditions.

[0061] Figure 14 An MTF performance detection curve diagram of a set of optical imaging systems meeting f1 / R1 < -5.0 (such as f1 / R1 = -5.82), 45° < Semi-FOV < 60° (such as Semi-FOV = 50.2°) and d1s / f1 < 0 (such as d1s / f1 = -0.45) is shown. Figure 15 An MTF performance detection curve diagram of a set of optical imaging systems meeting -f1 / R1 > 0 (such as f1 / R1 = 3.07), Semi-FOV > 60° (such as Semi-FOV = 63°) and d1s / f1 > 0.5 (such as d1s / f1 = 0.67) is shown. Figure 16 ​Fig. 3 shows a set of MTF performance detection curves of optical imaging systems satisfying -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60° and 0 < d1s / f1 < 0.5, such as f1 / R1 = -1.92, Semi-FOV = 52.5° and d1s / f1 = 0.17.

[0062] It can be seen from Figures 14 to 16 that, compared with Figure 14 and Figure 15 Fig. 3 shows the MTF performance detection curves of optical imaging systems, the MTF curve peak is relatively high, the curve distribution is relatively concentrated, and the field curvature consistency is good. Figure 16 It can be seen that the optical imaging system satisfying -5.0 < f1 / R1 < 0, 45° < Semi-FOV < 60° and 0 < d1s / f1 < 0.5 can meet the performance and structure requirements while reducing the field curvature, improving the quality and yield of the system, and ensuring the excellent reliability of the system.

[0063] In an example embodiment, the optical imaging system according to the present application can satisfy 5.0 < (f3 / N3-f4 / N4) / EP34 < 10.0, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, N3 is the refractive index of the third lens, N4 is the refractive index of the fourth lens, and EP34 is the interval distance between the image side surface of the third interval element and the object side surface of the fourth interval element in the direction along the optical axis. Figure 13 Satisfying 5.0 < (f3 / N3-f4 / N4) / EP34 < 10.0 is helpful to change the refraction and scattering effects of light passing through the third and fourth lenses, thereby being conducive to reducing the spherical aberration of the system, changing the size of the aspheric outer diameter of the lens and the off-axis height of the light, reducing the risk of light leakage, and improving the imaging quality of the system.

[0064] In an example embodiment, the optical imaging system according to the present application can satisfy 0 < f3 / f < 1.0, -5.0 < f4 / f < 0 and 1.0 < f34 / (d4s-d3s) < 5.0, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f is the total effective focal length of the optical imaging system, f34 is the combined focal length of the third and fourth lenses, and d3s is the inner diameter of the object side surface of the third interval element. Figure 13d4s is the inner diameter of the object side of the fourth spacer element. Satisfying 0 < f3 / f < 1.0, -5.0 < f4 / f < 0, and 1.0 < f34 / (d4s-d3s) < 5.0 helps to optimize the light leakage problem caused by the third and fourth lenses. Controlling the effective focal length of the third and fourth lenses can constrain the outer diameter of the lenses. At the same time, controlling their inner diameter can intercept the light leakage beam passing through the edge of the effective aperture of the third and fourth lenses, reduce the risk of light leakage, and improve the imaging quality of the system.

[0065] In an exemplary embodiment, the optical imaging system according to this application satisfies: -5.0 < R2 / R3 < 0 and 5.0 < EP12 / T12 < 11.0, where R2 is the radius of curvature of the image-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, and EP12 is the distance between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis. Figure 13 T12 is the air gap between the first and second lenses on the optical axis. Satisfying -5.0 < R2 / R3 < 0 and 5.0 < EP12 / T12 < 11.0 can effectively improve the molding feasibility of the first and second lenses. By controlling the ratio of the spacing between the first and second spacer elements to the air gap between the first and second lenses, the overall thickness uniformity of the first and second lenses can be improved, as well as the assembly stability and performance consistency of the first and second lenses.

[0066] In an exemplary embodiment, the optical imaging system according to this application satisfies: -5.0 < f2 / L < -1.0, where f2 is the effective focal length of the second lens, and L is the distance between the object-side end and the image-side end of the lens barrel along the optical axis, i.e., the total length of the lens barrel. Typically, the total length L of the lens barrel is related to the total optical length (TTL) of the system and the module size. With a fixed TTL, the smaller L is, the larger the mechanical back focal length of the system, and the greater the space for system and module matching and adjustment. By setting -5.0 < f2 / L < -1.0, this application helps to control the system's external dimensions within a reasonable range, thereby increasing the space for system and module matching and adjustment.

[0067] In an exemplary embodiment, the optical imaging system according to this application satisfies: 0 < d2s × 2 / (d1s + d3s) < 0.7, where d1s is the inner diameter of the object-side surface of the first spacer element. Figure 13 ), d2s is the inner diameter of the object side of the second spacer element ( Figure 13 ), d3s is the inner diameter of the object side of the third spacer element ( Figure 13In this application, the first and second lenses can be used to converge the light beam, and the third lens can be used to diverge the converged light beam. Based on this, by setting 0 < d2s×2 / (d1s+d3s) < 0.7, the system's ability to capture light can be controlled, which is beneficial for the system to obtain high image quality in low-light environments. At the same time, the inner diameter of the object side of the second spacer element can be made smaller than the inner diameter of the object side of the two adjacent spacers, which is beneficial for the second spacer element to intercept invalid light and reduce the generation of stray light.

[0068] In an exemplary embodiment, the optical imaging system according to this application satisfies: 0.5 < R3 / R4 - R4 / R5 < 1.5 and 4.0 mm < (D3s - D2s) / (R4 / R5) < 11.0 mm, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, R5 is the radius of curvature of the object-side surface of the third lens, and D2s is the outer diameter of the object-side surface of the second spacer element. Figure 13 D3s is the outer diameter of the object side of the third spacer element. Figure 13 In this application, the third lens can diverge light. Based on this, by setting 0.5 < R3 / R4 - R4 / R5 < 1.5 and 4.0 mm < (D3s - D2s) / (R4 / R5) < 11.0 mm, the degree of light divergence can be controlled, which helps the light to be transmitted more evenly to the fourth and fifth lenses. Furthermore, by controlling the outer diameter of the second and third spacer elements, the outer diameter of the lens behind the fourth lens can be controlled, reducing the step length between lenses and improving the feasibility of forming each lens and the assembly stability.

[0069] In an exemplary embodiment, the optical imaging system according to this application satisfies: 1.01 < N4 / N5 < 1.5 and -20.0 < f4 / EP45 < -5.0, where N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, f4 is the effective focal length of the fourth lens, and EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis. Figure 13 Satisfying 1.01 < N4 / N5 < 1.5 and -20.0 < f4 / EP45 < -5.0 is beneficial for making the refractive index of the fourth lens slightly greater than that of the fifth lens, allowing more effective light to be transmitted from the fourth lens to the fifth lens. This allows for better control of the system's principal optical parameters, such as relative illumination and aperture number, to achieve better imaging results.

[0070] In an exemplary embodiment, the optical imaging system according to the present application can satisfy: -1.0 < (T34 + EP34) / R6 < 0 and -1.5 < (T34 + EP34) / R7 < 0, where T34 is an air interval of the third lens and the fourth lens in the optical axis direction, EP34 is an interval distance of the image side surface of the third spacer element to the object side surface of the fourth spacer element in the direction along the optical axis, Figure 13 ), R6 is a curvature radius of the image side surface of the third lens, and R7 is a curvature radius of the object side surface of the fourth lens. Satisfying -1.0 < (T34 + EP34) / R6 < 0 and -1.5 < (T34 + EP34) / R7 < 0 helps to control the thickness of the fourth lens, control the air interval of the third lens and the fourth lens, improve the selectable space of the third spacer element (the greater the interval of the adjacent lenses, the easier the selection of the spacer element), reduce the stray light between the third lens and the fourth lens, and thus help to reduce the overall stray light of the system.

[0071] In an exemplary embodiment, the optical imaging system according to the present application can satisfy: -2.0 < (EP45 x V5) / (f5 x N5) < 1.0, where EP45 is an interval distance of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction along the optical axis, Figure 13 ), N5 is a refractive index of the fifth lens, V5 is a dispersion coefficient of the fifth lens, and f5 is an effective focal length of the fifth lens. Satisfying -2.0 < (EP45 x V5) / (f5 x N5) < 1.0 helps to reasonably control the sag and processing angle of the fifth lens, helps to reduce the difficulty of the forming process of the fifth lens, makes the fifth lens data more optimal, and is more conducive to assembly, simultaneously reduces resource waste, and reduces costs.

[0072] In an exemplary embodiment, the optical imaging system according to the present application can satisfy: 0.10 < d5s / f6 < 1.0, where d5s is an inner diameter of the object side surface of the fifth spacer element, Figure 13 ), and f6 is an effective focal length of the sixth lens. Satisfying 0.10 < d5s / f6 < 1.0 helps to control the dispersion state of the light passing to the sixth lens and ensure the uniformity of the light diverging from the sixth lens to the image plane, improving the overall quality of the picture.

[0073] In an exemplary embodiment, the optical imaging system according to the present application can satisfy: 1.0 < (EP45 + CP5) / (CT5 + T56) < 1.5, where EP45 is an interval distance of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction along the optical axis, Figure 13 ), CP5 is a maximum thickness of the fifth spacer element in the direction along the optical axis, Figure 13), CT5 is the central thickness of the fifth lens on the optical axis, and T56 is the air gap of the fifth lens and the sixth lens on the optical axis. In the present application, EP45 has a greater impact on the assembly stability of the system, and the greater EP45 is, the worse the assembly stability of the system is. Therefore, the assembly stability of the system can be met by controlling EP45 within a reasonable range. Based on this, the present application can better control the thickness, imaging quality and spacing distance of the fifth and sixth lenses, reduce the sensitivity of the lens at this position and the influence on the imaging quality of the entire imaging system, and at the same time improve the assembly stability of the part close to the imaging surface of the imaging system by setting 1.0 < (EP45 + CP5) / (CT5 + T56) < 1.5.

[0074] In an exemplary embodiment, the optical imaging system according to the present application can satisfy -5.0 < d5s / R10 + d5m / R11 < 10.0, where d5s is the inner diameter of the object side surface of the fifth spacer element (d5s = 0.5*Dis5), Figure 13 d5m is the inner diameter of the image side surface of the fifth spacer element, R10 is the curvature radius of the image side surface of the fifth lens, and R11 is the curvature radius of the object side surface of the sixth lens. Satisfying -5.0 < d5s / R10 + d5m / R11 < 10.0 can control the spacing distance between the fifth and sixth lenses, thereby reasonably distributing the optical power, improving the performance of the optical imaging system, and also can ensure the wall thickness of each spacer element, improve the uniformity of the spacer element and the overall structural strength, and improve the assembly stability.

[0075] In an exemplary embodiment, the image side surface of at least three lenses among the first lens to the fifth lens according to the present application is a convex surface, where the image side surface of the i-th lens is a convex surface, and the optical imaging system can satisfy 1.01 mm < Dis-dis < 5.00 mm, Dis is the outer diameter of the object side surface of the i-th spacer element, and dis is the inner diameter of the object side surface of the i-th spacer element, i is selected from 1, 2, 3, 4 or 5. Satisfying 1.01 mm < Dis-dis < 5.00 mm is conducive to setting the object side surface of the first lens as a concave surface, thereby being conducive to ensuring a larger field of view angle, the image side surface of the first lens being a convex surface is conducive to correcting off-axis aberration, and the object side surface of the third and fourth lenses being a convex surface is conducive to reducing the astigmatism generated by the first few lenses. In addition, the lens with the concave image side surface is helpful to shorten the total length of the system and realize the miniaturization of the module.

[0076] In the example embodiment, the plurality of spacer elements according to the present application further comprises a fifth auxiliary spacer element located on the image side of the fifth spacer element and in contact with the image side surface of the fifth spacer element, and the optical imaging system satisfies: 0.3 < d5bm / f56 < 2.0, where d5bm is the inner diameter of the image side surface of the fifth auxiliary spacer element, and f56 is the combined focal length of the fifth lens and the sixth lens. In the present application, the fifth and sixth lenses can diverge the incoming light onto the imaging surface, and the light can diverge after passing through the fifth and sixth lenses. By setting 0.3 < d5bm / f56 < 2.0, the combined focal length of the fifth lens and the sixth lens and the inner diameter of the fifth auxiliary spacer element can be controlled within a reasonable range, the light divergence effect can be enhanced, the overall relative luminance of the system can be increased, and the shooting quality can be improved.

[0077] In the example embodiment, at least one surface of at least one of the first lens to the third lens has a reverse point. By setting at least one surface of at least one of the first lens to the third lens to have a reverse point, the present application is beneficial for the introduction of external light, facilitates the mutual compensation of the spherical aberrations of the first, second, and third lenses, and can reduce the low-order aberrations of the system as a whole.

[0078] In the example embodiment, the image side surface of the first lens has a reverse point, and the optical imaging system satisfies: 0.2 < Yc12 / (D1s-d1s) < 1.5, where Yc12 is the distance between the reverse point on the image side surface of the first lens and the intersection of the image side surface of the first lens and the optical axis in the direction perpendicular to the optical axis, i.e., Yc12 is the vertical distance from the reverse point on the image side surface of the first lens to the optical axis, D1s is the outer diameter of the object side surface of the first spacer element, and d1s is the inner diameter of the object side surface of the first spacer element. Figure 13 The image side surface of the first lens has a reverse point, which is beneficial for the convergence of light in each field of view of the imaging system, and satisfies 0.2 < Yc12 / (D1s-d1s) < 1.5, which can control the ratio of the vertical distance of the reverse point of the first lens to the difference between the outer diameter of the object side surface to be within a reasonable numerical range, which is beneficial for reducing the size of the system, maintaining the ultra-thin nature of the system, and saving the space occupied by the imaging system.

[0079] In the example embodiment, the optical imaging system according to the present application satisfies: DT21 < DT12 < DT51 and 4.0 < d5s / d2s < 5.0, where DT12 is the maximum effective radius of the image side surface of the first lens, DT21 is the maximum effective radius of the object side surface of the second lens, DT51 is the maximum effective radius of the object side surface of the fifth lens, d2s is the inner diameter of the object side surface of the second spacer element, and d5s is the inner diameter of the object side surface of the fifth spacer element. Example 1 Figure 1 ​)。Satisfying DT21 < DT12 < DT51 and 4.0 < d5s / d2s < 5.0 is conducive to ensuring that the light rays show a divergent trend when passing through the fifth lens, ensuring the rationality of the light ray trend, and conducive to controlling the inner diameter of the object side of the second spacer element, so that the second spacer element effectively blocks stray light and improves imaging quality.

[0080] In the example embodiments, the optical imaging system according to the present application further comprises a diaphragm arranged between the second lens and the third lens. Optionally, the optical imaging system described above can further comprise a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging system with small head, large field of view, low sensitivity, small stray light, high stability, high yield, and high imaging quality. The optical imaging system according to the above embodiments of the present application can use multiple lenses, for example, six lenses as described above. By reasonably allocating the optical power, surface type, material, central thickness of each lens, and axial distance between each lens, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, so that the optical imaging system is more conducive to production and processing. In the optical imaging system according to the above embodiments of the present application, by arranging a spacer element between adjacent lenses and designing the inner and outer diameters of the spacer element according to the light path, stray light can be effectively blocked and eliminated, and the imaging quality of the lens can be improved.

[0081] In the embodiments of the present application, at least one of the mirror surfaces of each lens is a non-spherical mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is a non-spherical mirror surface. The characteristic of the aspherical lens is that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens with constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, has the advantages of improving the distortion aberration and improving the astigmatism aberration. After using the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is a non-spherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are non-spherical mirror surfaces.

[0082] However, those skilled in the art should understand that the number of lenses constituting the optical imaging system can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although six lenses are described as an example in the embodiments, the optical imaging system is not limited to including six lenses. If necessary, the optical imaging system can further include other numbers of lenses.

[0083] The following further describes specific embodiments of optical imaging systems applicable to the above-described embodiments with reference to the accompanying drawings.

[0084] Figure 1

[0085] The following further describes specific embodiments of optical imaging systems applicable to the above-described embodiments with reference to the accompanying drawings. Figure 1 An optical imaging system according to Embodiment 1 of the present application is described. Figure 1 An optical imaging system of Embodiment 1 is shown.

[0086] As shown, the optical imaging system comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging plane (not shown). Parameter The first lens E1 has positive refractive power, with its object side surface S1 being concave and its image side surface S2 being convex. The second lens E2 has negative refractive power, with its object side surface S3 being convex and its image side surface S4 being concave. The third lens E3 has positive refractive power, with its object side surface S5 being convex and its image side surface S6 being convex. The fourth lens E4 has negative refractive power, with its object side surface S7 being concave and its image side surface S8 being convex. The fifth lens E5 has positive refractive power, with its object side surface S9 being concave and its image side surface S10 being convex. The sixth lens E6 has positive refractive power, with its object side surface S11 being convex and its image side surface S12 being concave. The filter has an object side surface S13 and an image side surface S14. Light from the object passes through the surfaces S1 to S14 in order and is ultimately imaged on the imaging plane S15.

[0087] Table 1 shows a table of basic parameters of the optical imaging system of Embodiment 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0088]

[0089] Table 1

[0090]

[0091] In this example, the half of the maximum field of view angle Semi-FOV of the optical imaging system is 52.50°, the total effective focal length f of the optical imaging system is 3.85 mm, and the distance Yc12 between the inflection point on the image side surface of the first lens and the intersection of the image side surface of the first lens and the optical axis in a direction perpendicular to the optical axis is 0.8786 mm.

[0092] As shown, the optical imaging system comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging plane (not shown). d1s ​As shown, the optical imaging system can include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a fifth auxiliary spacer element P5b, respectively. The lens barrel can accommodate the first lens E1 to the sixth lens E6 and the first spacer element P1 to the fifth auxiliary spacer element P5b.

[0093] Tables 2-1 and 2-2 show a basic parameter table of each spacer element in the optical imaging system of Embodiment 1, wherein the unit of each parameter is millimeter (mm).

[0094] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 2.6677 4.7200 1.7016 4.9200 2.5627 6.3000 4.2000 8.7679

[0095] Table 2-1

[0096] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Figure number L Figure number 7.3325 8.2732 8.5505 0.4573 1.0577 0.6528 0.4278 8.1738 5.8000

[0097] Table 2-2

[0098] It should be understood that, in the present example, the structure and parameters of each spacer element are only exemplarily listed, and the specific structure and actual parameters of each spacer element are not explicitly limited. The specific structure and actual parameters of each spacer element can be set by any suitable manner in actual production.

[0099] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0100]

[0101] wherein x is the sag of the aspherical surface at a position along the optical axis direction at a height of h, from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Tables 3-1 and 3-2 below give the high-order term coefficients A4, A6, A8, A10, and A12 that can be used for each aspherical surface S1-S12 in Embodiment 1. 10 12 14 16 18 20 22 24 26 28 30 .

[0102] Example 2 A4 A6 A8 A10 A12 A14 A16 S1 4.8241E-01 -2.3976E-02 1.4064E-02 -1.1588E-03 1.0367E-03 -1.2112E-04 -8.0303E-06 S2 4.2237E-01 -5.6124E-02 1.9843E-02 -6.4444E-03 3.0637E-03 -1.4018E-03 6.3725E-04 S3 -8.9084E-02 -1.5746E-02 6.3563E-03 -1.2710E-03 6.5973E-04 -2.9237E-04 1.0675E-04 S4 -1.8063E-02 2.7083E-03 9.3345E-04 3.8532E-04 9.5628E-05 3.3088E-05 1.2803E-05 S5 -2.4633E-02 -1.1983E-03 2.7430E-04 1.6246E-04 3.5512E-05 1.5814E-05 5.9386E-07 S6 -1.0170E-01 -5.7339E-03 -2.8435E-04 3.5428E-04 2.0560E-04 1.3486E-04 5.8080E-05 S7 -1.0345E-01 1.0537E-01 -6.0117E-03 -4.2180E-03 1.4759E-03 -2.2983E-04 2.0788E-04 S8 -1.9851E-01 1.0500E-01 1.9651E-02 -2.0911E-02 6.7582E-03 -2.3259E-03 1.0553E-03 S9 1.4373E-01 -3.2037E-01 1.7848E-01 -3.0906E-02 2.3403E-02 -1.9460E-02 1.9137E-03 S10 1.5623E+00 -2.9717E-01 1.6522E-01 -2.0463E-03 3.0448E-05 4.2750E-03 -8.2597E-03 S11 -2.0789E+00 6.8945E-01 -2.1078E-01 4.8124E-02 7.2346E-03 -1.7895E-02 9.3072E-03 S12 -9.5919E+00 1.8784E+00 -6.2352E-01 2.2557E-01 -8.3119E-02 4.5727E-02 -2.3568E-02

[0103] Table 3-1​​​​​​​​​​

[0104] Figure 2 A18 A20 A22 A24 A26 A28 A30 S1 -5.0380E-05 -4.4170E-05 -2.8675E-05 -2.7822E-05 -1.6484E-06 -1.6376E-06 6.9189E-06 S2 -3.7257E-04 1.5279E-04 -1.1127E-04 4.4235E-05 -2.0338E-05 1.4257E-05 -3.1689E-06 S3 -4.9011E-05 1.6421E-05 -6.7297E-06 1.0492E-06 2.7613E-06 -3.1876E-06 9.5775E-07 S4 3.9610E-06 4.4180E-06 1.2698E-06 4.0535E-07 -3.6490E-06 -4.8286E-08 3.2984E-07 S5 3.6054E-06 -1.7477E-06 1.0649E-06 -9.7230E-07 6.9244E-07 -1.1515E-06 3.7347E-07 S6 2.7838E-05 8.9627E-06 9.0266E-06 1.4202E-06 9.5941E-07 -6.7505E-06 1.8833E-06 S7 -1.3324E-04 3.6175E-05 -7.2740E-06 2.2518E-06 -3.2877E-08 -4.4897E-06 1.1263E-06 S8 -4.4886E-04 1.6236E-04 -6.9538E-05 2.3253E-05 5.9119E-07 -2.0667E-06 1.9300E-07 S9 -1.3922E-03 2.6388E-03 -3.2116E-04 -2.6157E-05 -3.0184E-04 6.4479E-05 2.0890E-05 S10 5.1115E-03 -1.3465E-03 2.0034E-04 -2.0040E-04 -1.5644E-04 2.2250E-04 -4.4125E-05 S11 -1.1727E-03 -2.6534E-03 2.2070E-03 -2.8489E-04 -7.7430E-04 5.9887E-04 -1.3181E-04 S12 1.1248E-02 -6.3333E-03 2.5778E-03 -1.5655E-03 6.6962E-04 -2.8011E-04 2.6352E-04

[0105] Table 3-2

[0106] Figure 2

[0107] The following refers to Figure 2 An optical imaging system according to Embodiment 2 is described. In this and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 2 An optical imaging system of Embodiment 2 is shown.

[0108] As shown in Parameter , the optical imaging system comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging plane (not shown).

[0109] In this example, the structures and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging plane can be the same as those of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging plane in Embodiment 1. Therefore, the basic parameter table of the optical imaging system of this example is exactly the same as the basic parameter table shown in Table 1 in Embodiment 1, and for the sake of brevity, this example will not be described in detail, and the relevant content can be found in Embodiment 1.

[0110] In this example, the high-order term coefficients of the aspherical mirrors S1-S12 can be the same as those shown in Tables 3-1 and 3-2 in Embodiment 1. Therefore, for the sake of brevity, the high-order term coefficients of the aspherical mirrors S1-S12 will not be described in detail in this example, and the relevant content can be found in Embodiment 1.

[0111] In this example, the values of the optical technical parameters Semi-FOV, f, and Yc12 can be the same as those in Embodiment 1. Therefore, for the sake of brevity, the values of these parameters will not be described in detail in this example, and the relevant content can be found in Embodiment 1.

[0112] As shown in d1sAs shown, the optical imaging system can include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a fifth auxiliary spacer element P5b, respectively. The lens barrel can accommodate the first lens E1 to the sixth lens E6 and the first spacer element P1 to the fifth auxiliary spacer element P5b.

[0113] Table 4-1 and Table 4-2 show the basic parameter table of each spacer element in the optical imaging system of Example 2, wherein the unit of each parameter is millimeter (mm).

[0114] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 2.7037 4.7200 1.7376 4.9200 2.5987 6.3000 4.2440 8.7679

[0115] Table 4-1

[0116] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Example 3 L Figure 3 7.3725 8.3132 8.5105 0.4573 1.0577 0.6528 0.4278 8.1738 5.8000

[0117] Table 4-2

[0118] It should be understood that, in the present example, the structure and parameters of each spacer element are only exemplarily listed, and the specific structure and actual parameters of each spacer element are not explicitly limited. The specific structure and actual parameters of each spacer element can be set by any suitable manner in actual production.

[0119] Figure 3

[0120] The following refers to Figure 3 An optical imaging system according to Example 3 of the present application is described. Figure 3 An optical imaging system of Example 3 is shown.

[0121] As Parameter shown, the optical imaging system includes, in order from the object side to the image side, a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging surface (not shown).

[0122] In the present example, the structure and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging surface can be the same as the structure and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging surface in Example 1. Therefore, the basic parameter table of the optical imaging system of the present example is exactly the same as the basic parameter table shown in Table 1 of Example 1, and to avoid redundancy, the present example will not be described in detail, and the specific content can be referred to the related disclosure of Example 1.

[0123] In this example, the higher-order coefficients of each aspherical mirror S1-S12 can be the same as those shown in Tables 3-1 and 3-2 of Example 1. Therefore, to avoid redundancy, this example will not describe the higher-order coefficients of each aspherical mirror S1-S12 in detail; please refer to the relevant content disclosed in Example 1 for details.

[0124] In this example, the values ​​of the optical technical parameters Semi-FOV, f, and Yc12 can be the same as those in Example 1. Therefore, to avoid redundancy, this example will not describe the values ​​of these parameters in detail; please refer to the relevant content disclosed in Example 1 for details.

[0125] like d1s As shown, the optical imaging system may include six spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a fifth auxiliary spacer element P5b. The lens barrel may accommodate first lenses E1 to sixth lenses E6 and first spacer elements P1 to fifth auxiliary spacer elements P5b.

[0126] Tables 5-1 and 5-2 show the basic parameters of each spacer element in the optical imaging system of Example 3, where the unit of each parameter is millimeters (mm).

[0127] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 2.6637 4.7346 1.6976 4.9600 2.5587 6.3400 4.2040 8.8079

[0128] Table 5-1

[0129] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Figure 4A L Figure 4B 7.2925 8.2332 8.5905 0.4723 1.0177 0.6728 0.4078 8.1338 5.8200

[0130] Table 5-2

[0131] It should be understood that this example only illustrates the structure and parameters of each spacer element, and does not explicitly define the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0132] Figure 4C The on-axis chromatic aberration curves of the optical imaging systems of Examples 1 to 3 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the system. Figure 4D Astigmatism curves of the optical imaging systems of Examples 1 to 3 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figures 4A to 4D The distortion curves of the optical imaging systems of Examples 1 to 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Example 4The magnification chromatic aberration curves of the optical imaging systems of Embodiments 1 to 3 are shown, which represent the deviation of different image heights of light rays after passing through the system on the imaging plane. According to Figure 5 It can be known that the optical imaging systems given in Embodiments 1 to 3 can achieve good imaging quality.

[0133] Figure 5

[0134] Hereinafter, the optical imaging system according to Embodiment 4 of the present application is described with reference to Figure 5 The optical imaging system according to Embodiment 4 of the present application is shown. Figure 5 The optical imaging system according to Embodiment 4 of the present application is shown.

[0135] As shown in Parameter the optical imaging system comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging plane (not shown).

[0136] The first lens E1 has positive refractive power, the object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive refractive power, the object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has negative refractive power, the object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has negative refractive power, the object side surface S9 is concave, and the image side surface S10 is convex. The sixth lens E6 has positive refractive power, the object side surface S11 is convex, and the image side surface S12 is concave. The filter has an object side surface S13 and an image side surface S14. Light from the object passes through each surface S1 to S14 in order and is finally imaged on the imaging plane S15.

[0137] Table 6 shows the basic parameter table of the optical imaging system of Embodiment 4, wherein the units of the curvature radius, the thickness / distance, and the focal length are all millimeters (mm).

[0138]

[0139] Table 6

[0140] In the present example, the half of the maximum field angle of the optical imaging system Semi-FOV is 53.09°, the total effective focal length f of the optical imaging system is 3.78 mm, and the distance Yc12 between the inflection point on the image side surface of the first lens and the intersection of the image side surface of the first lens and the optical axis in the direction perpendicular to the optical axis is 2.1186 mm.

[0141] As shown in d1sAs shown, the optical imaging system can include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5 and a fifth auxiliary spacer element P5b, respectively. The lens barrel can accommodate the first lens E1 to the sixth lens E6 and the first spacer element P1 to the fifth auxiliary spacer element P5b.

[0142] Table 7-1 and Table 7-2 show the basic parameter table of each spacer element in the optical imaging system of Example 4, wherein the unit of each parameter is millimeter (mm).

[0143] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 3.3803 5.5221 1.6876 5.4597 2.6092 7.0055 3.9730 8.6107

[0144] Table 7-1

[0145] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Figure number L Figure number 7.1752 7.6808 8.7055 0.6255 1.0165 0.5887 0.3463 6.8268 5.8300

[0146] Table 7-2

[0147] It should be understood that, in the present example, the structure and parameters of each spacer element are only exemplarily listed, and the specific structure and actual parameters of each spacer element are not explicitly limited. The specific structure and actual parameters of each spacer element can be set by any suitable manner in actual production.

[0148] The following Tables 8-1 and 8-2 give the high-order term coefficients of each aspherical mirror S1-S12 that can be used in Example 4.

[0149] Example 5 A4 A6 A8 A10 A12 A14 A16 S1 1.0571E+00 -1.2915E-01 4.0881E-02 -9.9984E-03 4.8741E-03 -1.7549E-03 5.1020E-04 S2 1.7825E-01 -3.1478E-02 1.0117E-02 -1.9120E-03 1.2980E-03 -9.4128E-04 3.0401E-04 S3 -5.0979E-02 -2.2342E-02 7.1440E-03 -1.8981E-03 8.0143E-04 -3.2768E-04 1.1701E-04 S4 -1.4946E-02 1.5561E-03 6.0633E-04 2.3521E-04 4.9751E-05 2.1316E-05 6.8185E-06 S5 -1.7148E-02 -1.3304E-03 3.3138E-04 1.2543E-04 2.6799E-05 2.0535E-06 1.3291E-07 S6 -1.2365E-01 -6.6100E-03 1.7086E-03 1.5002E-03 8.3635E-04 3.7343E-04 1.4793E-04 S7 -2.5970E-01 1.4949E-01 -2.5042E-02 -3.6119E-03 2.2906E-03 -2.0423E-04 1.0591E-04 S8 -3.0774E-01 1.8513E-01 -1.7676E-02 -1.3824E-02 4.0567E-03 -5.0153E-04 1.1357E-04 S9 1.7059E-01 -3.6344E-01 1.7119E-01 -4.1260E-02 2.6278E-02 -1.8484E-02 1.4847E-03 S10 5.1349E-01 -3.6447E-01 2.1689E-01 -4.8104E-02 -1.2409E-02 -5.2388E-03 -5.2428E-03 S11 -2.3105E+00 6.6721E-01 -9.4378E-02 -3.0951E-02 2.1961E-02 -2.4903E-03 -6.8159E-03 S12 -9.6948E+00 1.8936E+00 -5.8994E-01 2.2266E-01 -9.3395E-02 5.8542E-02 -2.4077E-02

[0150] Table 8-1

[0151] Figure 6 A18 A20 A22 A24 A26 A28 A30 S1 -2.3058E-04 1.8174E-05 -5.0981E-05 -1.4133E-07 1.5142E-05 0.0000E+00 0.0000E+00 S2 -2.6175E-04 5.1523E-05 -4.8909E-05 4.0278E-05 -1.8507E-05 0.0000E+00 0.0000E+00 S3 -5.3918E-05 2.1342E-05 -7.0142E-06 2.9395E-06 -1.4337E-06 4.0124E-07 0.0000E+00 S4 3.2112E-06 7.7657E-07 4.0688E-07 -6.0073E-07 -1.0028E-06 3.0712E-07 0.0000E+00 S5 -2.7338E-06 5.9333E-07 3.9480E-07 -1.5251E-06 4.7618E-07 0.0000E+00 0.0000E+00 S6 2.4082E-05 -1.2631E-05 -2.8545E-05 -1.7560E-05 -5.5062E-06 5.3812E-06 0.0000E+00 S7 -6.5212E-05 1.3199E-05 -9.6323E-06 1.8640E-06 -1.0682E-06 0.0000E+00 0.0000E+00 S8 3.1614E-04 -2.1853E-04 1.1555E-04 -8.4806E-05 2.9966E-05 -3.4548E-06 0.0000E+00 S9 -2.4841E-03 2.0983E-03 1.7981E-04 2.0804E-04 -1.9705E-04 7.2112E-06 0.0000E+00 S10 1.1225E-02 -2.4677E-03 2.4575E-03 -2.0291E-03 6.2927E-04 -2.1958E-04 0.0000E+00 S11 2.6037E-03 9.4292E-04 -4.5139E-05 -8.2561E-04 4.2219E-04 0.0000E+00 0.0000E+00 S12 1.2614E-02 -9.5847E-03 3.3230E-03 -2.7203E-03 8.5498E-04 -8.5767E-04 6.8889E-04

[0152] Table 8-2

[0153] Figure 6

[0154] The following refers to Figure 6 An optical imaging system according to Example 5 of the present application is described. Figure 6 An optical imaging system of Example 5 is shown.

[0155] As Parameter shown, the optical imaging system includes, in order from the object side to the image side, a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown) and an imaging surface (not shown).

[0156] In the present example, the structures and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter and the imaging surface can be the same as the structures and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter and the imaging surface in Embodiment 4. Therefore, the basic parameter table of the optical imaging system of the present example is completely the same as the basic parameter table shown in Table 6 in Embodiment 4, and for the sake of brevity, the present example will not be described in detail, and the specific content can be referred to the related content disclosed in Embodiment 4.

[0157] In the present example, the high-order term coefficients of the aspherical mirrors S1-S12 can be the same as the high-order term coefficients of the aspherical mirrors S1-S12 shown in Tables 8-1 and 8-2 in Embodiment 4. Therefore, for the sake of brevity, the high-order term coefficients of the aspherical mirrors S1-S12 will not be described in detail in the present example, and the specific content can be referred to the related content disclosed in Embodiment 4.

[0158] In the present example, the values of the optical technical parameters Semi-FOV, f and Yc12 can be the same as the values of Semi-FOV, f and Yc12 in Embodiment 4. Therefore, for the sake of brevity, the values of these parameters will not be described in detail in the present example, and the specific content can be referred to the related content disclosed in Embodiment 4.

[0159] As shown in Table 9-1 and Table 9-2, the basic parameter table of each spacer element in the optical imaging system of Embodiment 5 is shown, wherein the unit of each parameter is millimeter (mm). d1s

[0160] Table 9-1 and Table 9-2 show the basic parameter table of each spacer element in the optical imaging system of Embodiment 5, wherein the unit of each parameter is millimeter (mm).

[0161] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 3.4163 5.5221 1.7236 5.4597 2.6452 7.0055 4.0170 8.6107

[0162] Table 9-1

[0163] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Example 6 L Figure 7 7.1352 7.6408 8.6655 0.6255 1.0165 0.5887 0.3463 6.8268 5.8300

[0164] Table 9-2

[0165] It should be understood that in the present example, only the structures and parameters of each spacer element are exemplarily listed, and the specific structures and actual parameters of each spacer element are not explicitly limited. In actual production, the specific structures and actual parameters of each spacer element can be set by any suitable manner.

[0166] It should be understood that in the present example, only the structures and parameters of each spacer element are exemplarily listed, and the specific structures and actual parameters of each spacer element are not explicitly limited. In actual production, the specific structures and actual parameters of each spacer element can be set by any suitable manner.Figure 7

[0167] The following refers to Figure 7 An optical imaging system according to Embodiment 6 is described. Figure 7 An optical imaging system of Embodiment 6 is shown.

[0168] As Parameter shown, the optical imaging system includes, in order from the object side to the image side, a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging plane (not shown).

[0169] In this example, the structures and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging plane can be the same as those of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging plane in Embodiment 4. Therefore, the basic parameter table of the optical imaging system of this example is exactly the same as the basic parameter table shown in Table 6 in Embodiment 4, and for the sake of brevity, this example will not be described in detail, and the specific content can be referred to the related content disclosed in Embodiment 4.

[0170] In this example, the high-order term coefficients of the aspherical mirrors S1-S12 can be the same as those of the aspherical mirrors S1-S12 shown in Tables 8-1 and 8-2 in Embodiment 4. Therefore, for the sake of brevity, the high-order term coefficients of the aspherical mirrors S1-S12 will not be described in detail in this example, and the specific content can be referred to the related content disclosed in Embodiment 4.

[0171] In this example, the values of the optical technical parameters Semi-FOV, f, and Yc12 can be the same as those of Semi-FOV, f, and Yc12 in Embodiment 4. Therefore, for the sake of brevity, the values of these parameters will not be described in detail in this example, and the specific content can be referred to the related content disclosed in Embodiment 4.

[0172] As d1s shown, the optical imaging system can include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a fifth auxiliary spacer element P5b. The lens barrel can accommodate the first lens E1 to the sixth lens E6 and the first spacer element P1 to the fifth auxiliary spacer element P5b.

[0173] Tables 10-1 and 10-2 show the basic parameter tables of the spacer elements in the optical imaging system of Embodiment 6, where the units of the parameters are all millimeters (mm).

[0174] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 3.3763 5.5821 1.6836 5.5197 2.6052 7.0655 3.9770 8.6707

[0175] Table 10-1

[0176] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Figure 8A L Figure 8B 7.0952 7.6008 8.7255 0.5955 0.9265 0.6087 0.3963 6.7868 5.8500

[0177] Table 10-2

[0178] It should be understood that, in the present example, the structure and parameters of each spacer element are only exemplarily listed, and the specific structure and actual parameters of each spacer element are not explicitly defined. The specific structure and actual parameters of each spacer element can be set in any suitable manner in actual production.

[0179] Figure 8C The on-axis chromatic aberration curves of the optical imaging system of Embodiment 4 to Embodiment 6 are shown, which represent the deviation of light rays of different wavelengths after passing through the system. Figure 8D The astigmatism curves of the optical imaging system of Embodiment 4 to Embodiment 6 are shown, which represent the meridional image surface curvature and sagittal image surface curvature. Figures 8A to 8D The distortion curves of the optical imaging system of Embodiment 4 to Embodiment 6 are shown, which represent the distortion size values corresponding to different field angles. Example 7 The magnification chromatic aberration curves of the optical imaging system of Embodiment 4 to Embodiment 6 are shown, which represent the deviation of different image heights of light rays on the imaging surface after passing through the system. According to Figure 9 It can be known that the optical imaging system given by Embodiment 4 to Embodiment 6 can achieve good imaging quality.

[0180] Figure 9

[0181] The following refers to Figure 9 An optical imaging system according to Embodiment 7 of the present application is described. Figure 9 The optical imaging system of Embodiment 7 is shown.

[0182] As Parameter shown, the optical imaging system sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging surface (not shown).

[0183] The first lens E1 has positive refractive power, the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has negative refractive power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface. The fifth lens E5 has positive refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The sixth lens E6 has positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a concave surface. The filter has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15.

[0184] Table 11 shows a basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature, the thickness / distance, and the focal length are all millimeters (mm).

[0185]

[0186] Table 11

[0187] In this example, the half of the maximum field angle of the optical imaging system Semi-FOV is 52.50°, the total effective focal length f of the optical imaging system is 3.87 mm, and the distance Yc12 between the inflection point on the image side surface of the first lens and the intersection of the image side surface of the first lens and the optical axis in the direction perpendicular to the optical axis is 0.7764 mm.

[0188] As shown in d1s The optical imaging system can include six spacer elements, which are the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, and the fifth auxiliary spacer element P5b. The lens barrel can accommodate the first lens E1 to the sixth lens E6 and the first spacer element P1 to the fifth auxiliary spacer element P5b.

[0189] Table 12-1 and Table 12-2 show a basic parameter table of each spacer element in the optical imaging system of Example 7, wherein the units of each parameter are millimeters (mm).

[0190] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 2.7996 4.7505 1.6146 4.9505 2.6041 6.1722 4.0074 8.5889

[0191] Table 12-1

[0192] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Figure number L Example 8 7.3325 8.0263 8.3715 0.4852 0.9936 0.6347 0.3568 7.0354 5.9700

[0193] Table 12-2

[0194] It should be understood that in the present example, the structure and parameters of each spacer element are only exemplarily listed, and the specific structure and actual parameters of each spacer element are not explicitly defined. The specific structure and actual parameters of each spacer element can be set in any suitable manner in actual production.

[0195] The following Tables 13-1 and 13-2 show the high-order term coefficients of each aspherical mirror S1-S12 used in Example 7.

[0196] Figure 10 A4 A6 A8 A10 A12 A14 A16 S1 5.0922E-01 -2.7276E-02 1.5651E-02 -2.8009E-03 6.9626E-04 -4.5011E-04 -1.0371E-04 S2 4.2299E-01 -5.2886E-02 2.0328E-02 -7.2723E-03 3.0950E-03 -1.5169E-03 6.7144E-04 S3 -7.4175E-02 -1.6157E-02 6.2734E-03 -1.5183E-03 8.3123E-04 -2.8178E-04 1.2333E-04 S4 -9.9575E-03 2.1089E-03 5.1806E-04 2.3319E-04 5.9608E-05 2.7290E-05 6.6573E-06 S5 -2.5847E-02 -2.5260E-03 -7.3296E-05 2.0092E-05 2.4648E-05 9.0785E-07 7.4541E-06 S6 1.2374E-01 -1.1732E-02 4.1073E-03 2.2453E-04 -7.3746E-04 4.6007E-04 -1.4319E-04 S7 -2.4598E-01 6.5994E-02 3.7013E-02 9.3384E-05 -3.1244E-03 -8.7428E-04 1.4017E-04 S8 -3.6818E-01 1.5854E-01 5.6204E-02 -2.1785E-02 -6.9412E-03 -3.3090E-03 -1.8893E-03 S9 3.4585E-01 2.7524E-01 -1.9385E-01 -8.8077E-02 4.4956E-02 -4.0344E-02 -3.1159E-02 S10 1.4418E-01 8.1714E-02 -1.5027E-01 -1.3682E-01 3.6250E-02 -2.2356E-02 -1.6916E-02 S11 2.9097E-01 5.0621E-01 2.6953E-01 1.0948E-01 1.0277E-01 5.2875E-03 -2.1287E-02 S12 -8.9627E+00 1.5493E+00 -5.5368E-01 2.1071E-01 -6.8343E-02 5.1811E-02 -2.1984E-02

[0197] Table 13-1

[0198]

[0199]

[0200] Table 13-2

[0201] Figure 10

[0202] The following refers to Figure 10 An optical imaging system according to Example 8 of the present application is described. Figure 10 An optical imaging system of Example 8 is shown.

[0203] As Parameter shown, the optical imaging system comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging plane (not shown).

[0204] In the present example, the structure and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging plane can be the same as the structure and parameters of the first lens E1, the second lens E2, the stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging plane in Example 7. Therefore, the basic parameter table of the optical imaging system of the present example is exactly the same as the basic parameter table shown in Table 11 of Example 7, and for the sake of brevity, the present example will not be described in detail, and the relevant content can be referred to Example 7.

[0205] In the present example, the high-order term coefficients of each aspherical mirror S1-S12 can be the same as the high-order term coefficients of each aspherical mirror S1-S12 shown in Tables 13-1 and 13-2 of Example 7. Therefore, for the sake of brevity, the present example will not be described in detail the high-order term coefficients of each aspherical mirror S1-S12, and the relevant content can be referred to Example 7.

[0206] In this example, the values ​​of the optical technical parameters Semi-FOV, f, and Yc12 can be the same as those in Example 7. Therefore, to avoid redundancy, this example will not describe the values ​​of these parameters in detail; please refer to the relevant content disclosed in Example 7 for details.

[0207] like d1s As shown, the optical imaging system may include six spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a fifth auxiliary spacer element P5b. The lens barrel may accommodate first lenses E1 to sixth lenses E6 and first spacer elements P1 to fifth auxiliary spacer elements P5b.

[0208] Tables 14-1 and 14-2 show the basic parameters of each spacer element in the optical imaging system of Example 8, wherein the unit of each parameter is millimeters (mm).

[0209] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 2.8356 4.7505 1.6506 4.9505 2.6401 6.1722 4.0514 8.5889

[0210] Table 14-1

[0211] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Example 9 L Figure 11 7.2925 7.9863 8.3315 0.4852 0.9936 0.6347 0.3568 7.0354 5.9700

[0212] Table 14-2

[0213] It should be understood that this example only illustrates the structure and parameters of each spacer element, and does not explicitly define the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0214] Figure 11

[0215] The following is for reference Figure 11 An optical imaging system according to Embodiment 9 of this application is described. Figure 11 An optical imaging system of embodiment 9 is shown.

[0216] like Parameter As shown, the optical imaging system includes, in sequence from the object side to the image side: a first lens E1, a second lens E2, an aperture stop STO (not shown), a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter (not shown), and an imaging surface (not shown).

[0217] In this example, the structure and parameters of the first lens E1, the second lens E2, the aperture stop STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the filter, and the imaging surface are the same as those in Example 7. Therefore, the basic parameter table of the optical imaging system in this example is exactly the same as the basic parameters shown in Table 11 of Example 7. To avoid redundancy, this example will not describe it in detail; please refer to the relevant content disclosed in Example 7 for details.

[0218] In this example, the higher-order coefficients of each aspherical mirror S1-S12 can be the same as those shown in Tables 13-1 and 13-2 of Example 7. Therefore, to avoid redundancy, this example will not describe the higher-order coefficients of each aspherical mirror S1-S12 in detail; please refer to the relevant content disclosed in Example 7 for details.

[0219] In this example, the values ​​of the optical technical parameters Semi-FOV, f, and Yc12 can be the same as those in Example 7. Therefore, to avoid redundancy, this example will not describe the values ​​of these parameters in detail; please refer to the relevant content disclosed in Example 7 for details.

[0220] like d1s As shown, the optical imaging system may include six spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a fifth auxiliary spacer element P5b. The lens barrel may accommodate first lenses E1 to sixth lenses E6 and first spacer elements P1 to fifth auxiliary spacer elements P5b.

[0221] Tables 15-1 and 15-2 show the basic parameters of each spacer element in the optical imaging system of Example 9, where the unit of each parameter is millimeters (mm).

[0222] D1s d2s D2s d3s D3s d4s D4s Value Parameter d5s 2.7733 4.7305 1.5835 4.9305 2.5801 6.1922 3.9919 8.6289

[0223] Table 15-1

[0224] d5m D5s EP12 EP34 EP45 CP5 d5bm Value Figure 12A L Figure 12B 7.2325 7.9263 8.5281 0.5252 0.9236 0.6647 0.3768 6.9754 6.0000

[0225] Table 15-2

[0226] It should be understood that this example only illustrates the structure and parameters of each spacer element, and does not explicitly define the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0227] Figure 12C The on-axis chromatic aberration curves of the optical imaging systems of Embodiments 7-9 are shown, which represent the deviation of convergent focal points of light rays of different wavelengths after passing through the systems. Figure 12D The astigmatism curves of the optical imaging systems of Embodiments 7-9 are shown, which represent the meridional image curvature and sagittal image curvature. Figures 12A to 12D The distortion curves of the optical imaging systems of Embodiments 7-9 are shown, which represent the distortion values corresponding to different field angles. Conditional expression / Example The lateral chromatic aberration curves of the optical imaging systems of Embodiments 7-9 are shown, which represent the deviation of different image heights of light rays on the imaging plane after passing through the systems. According to the formula: Example 1 It can be seen that the optical imaging systems of Embodiments 7-9 can achieve good imaging quality.

[0228] In summary, Embodiments 1-9 respectively satisfy the relationships shown in Tables 16-1, 16-2 and 16-3.

[0229] Example 2 Example 3 f1 / R1 d1s / f1 (f3 / N3-f4 / N4) / EP34 -1.92 -1.92 -1.92 f3 / f 0.17 0.18 0.17 f4 / f 5.25 5.25 5.45 f34 / (d4s-d3s) 0.93 0.93 0.93 R2 / R3 -1.40 -1.40 -1.40 EP12 / T12 4.86 4.83 4.83 f2 / L -1.61 -1.61 -1.61 d2s x 2 / (d1s+d3s) 8.74 8.74 9.03 R3 / R4-R4 / R5 -3.69 -3.69 -3.67 ​ 0.65 0.66 0.65 ​ 1.10 1.10 1.10 (D3s-D2s) / (R4 / R5)(mm) 9.01 9.01 9.01 N4 / N5 1.06 1.06 1.06 f4 / EP45 -8.29 -8.29 -8.04 (T34+EP34) / R6 -0.78 -0.78 -0.77 (T34+EP34) / R7 -0.84 -0.84 -0.82 (EP45xV5) / (f5xN5) 0.55 0.55 0.56 d5s / f6 0.46 0.46 0.46 (EP45+CP5) / (CT5+T56) 1.35 1.35 1.35 d5s / R10+d5m / R11 3.55 3.57 3.54 D1s-d1s(mm) 2.05 2.02 2.07 D3s-d3s(mm) 3.74 3.70 3.78 D4s-d4s(mm) 4.57 4.52 4.60 D5s-d5s(mm) 1.22 1.14 1.30 d5bm / f56 1.26 1.26 1.26 Yc12 / (D1s-d1s) 0.43 0.44 0.42 d5s / d2s 4.31 4.24 4.30

[0230] Table 16-1

[0231] Conditional Formula / Examples Example 4 Example 5 Example 6 f1 / R1 -2.51 -2.51 -2.51 d1s / f1 0.34 0.35 0.34 (f3 / N3-f4 / N4) / EP34 8.80 8.80 9.66 f3 / f 0.90 0.90 0.90 f4 / f -3.00 -3.00 -3.00 f34 / (d4s-d3s) 3.60 3.58 3.58 R2 / R3 -0.85 -0.85 -0.85 EP12 / T12 7.26 7.26 6.91 f2 / L -1.94 -1.94 -1.93 d2s x 2 / (d1s+d3s) 0.56 0.57 0.56 R3 / R4-R4 / R5 1.29 1.29 1.29 (D3s-D2s) / (R4 / R5)(mm) 10.26 10.26 10.26 N4 / N5 1.07 1.07 1.07 f4 / EP45 -19.22 -19.22 -18.59 (T34+EP34) / R6 -0.83 -0.83 -0.79 (T34+EP34) / R7 -1.30 -1.30 -1.23 (EP45xV5) / (f5xN5) -1.11 -1.11 -1.15 d5s / f6 0.98 0.97 0.97 (EP45+CP5) / (CT5+T56) 1.16 1.16 1.25 d5s / R10+d5m / R11 5.81 5.79 5.76 D1s-d1s(mm) 2.14 2.11 2.21 D3s-d3s(mm) 4.40 4.36 4.46 D4s-d4s(mm) 4.64 4.59 4.69 D5s-d5s(mm) 1.53 1.53 1.63 d5bm / f56 0.34 0.34 0.34 Yc12 / (D1s-d1s) 0.99 1.01 0.96 d5s / d2s 4.25 4.14 4.21

[0232] Table 16-2

[0233]

[0234]

[0235] Table 16-3

[0236] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0237] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features can be replaced with technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. An optical imaging system, characterized in that, include: A lens group, along the optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having optical power, wherein at least one of the first lens to the sixth lens has a surface with a curvature point, and the number of lenses having optical power in the lens group is six. Multiple spacer elements, including: A first spacer element located on the image side of the first lens and in contact with the image side surface of the first lens; A second spacer element located on the image side of the second lens and in partial contact with the image side surface of the second lens; A third spacer element located on the image side of the third lens and in contact with the image side surface of the third lens; A fourth spacer element located on the image side of the fourth lens and in contact with the image side surface of the fourth lens; A fifth spacer element located on the image side of the fifth lens and in contact with the image side surface of the fifth lens; and A lens barrel for housing the lens group and the plurality of spacer elements; The first lens has positive optical power, and its object side is concave while its image side is convex. The second lens has negative optical power, with its object side being convex and its image side being concave. The third lens has positive optical power, and its object side is convex, as is its image side; The fourth lens has negative optical power, and its object side is concave while its image side is convex. The object-side surface of the fifth lens is concave, and the image-side surface is convex. The sixth lens has positive optical power, and its object side is convex while its image side is concave. The optical imaging system satisfies the following conditions: -2.53≤f1 / R1≤-1.92, 52.50°≤Semi-FOV≤53.09°, and 0.14≤d1s / f1≤0.35, where f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object-side surface of the first lens, Semi-FOV is half of the maximum field of view of the optical imaging system, and d1s is the inner diameter of the object-side surface of the first spacer element.

2. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: 5.25≤(f3 / N3-f4 / N4) / EP34≤9.66, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, N3 is the refractive index of the third lens, N4 is the refractive index of the fourth lens, and EP34 is the distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis.

3. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies the following: 0.86≤f3 / f≤0.93, -3.00≤f4 / f≤-1.40, 3.58≤f34 / (d4s-d3s)≤4.91, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f is the total effective focal length of the optical imaging system, f34 is the combined focal length of the third and fourth lenses, d3s is the inner diameter of the object-side surface of the third spacer element, and d4s is the inner diameter of the object-side surface of the fourth spacer element.

4. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: -1.91≤R2 / R3≤-0.85 and 6.91≤EP12 / T12≤10.06, where R2 is the radius of curvature of the image-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, EP12 is the distance between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis.

5. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: -4.20≤f2 / L≤-1.93, where f2 is the effective focal length of the second lens, and L is the distance between the object-side end and the image-side end of the lens barrel along the optical axis.

6. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: 0.56≤d2s×2 / (d1s+d3s)≤0.66, where d2s is the inner diameter of the object side of the second spacer element and d3s is the inner diameter of the object side of the third spacer element.

7. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies the following conditions: 1.01≤R3 / R4-R4 / R5≤1.29 and 5.60mm≤(D3s-D2s) / (R4 / R5)≤10.26mm, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, R5 is the radius of curvature of the object-side surface of the third lens, D2s is the outer diameter of the object-side surface of the second spacer element, and D3s is the outer diameter of the object-side surface of the third spacer element.

8. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: 1.01 < N4 / N5 ≤ 1.07 and -19.22 ≤ f4 / EP45 ≤ -8.04, where N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, f4 is the effective focal length of the fourth lens, and EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis.

9. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: -0.83≤(T34+EP34) / R6≤-0.66 and -1.30≤(T34+EP34) / R7≤-0.61, where T34 is the air gap between the third lens and the fourth lens on the optical axis, EP34 is the distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis, R6 is the radius of curvature of the image side of the third lens, and R7 is the radius of curvature of the object side of the fourth lens.

10. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: -1.15≤(EP45×V5) / (f5×N5)≤0.85, where EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis, N5 is the refractive index of the fifth lens, V5 is the dispersion coefficient of the fifth lens, and f5 is the effective focal length of the fifth lens.

11. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: 0.28≤d5s / f6<1.0, where d5s is the inner diameter of the object side of the fifth spacer element and f6 is the effective focal length of the sixth lens.

12. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: 1.16≤(EP45+CP5) / (CT5+T56)≤1.35, where EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis, CP5 is the maximum thickness of the fifth spacer element along the optical axis, CT5 is the center thickness of the fifth lens along the optical axis, and T56 is the air gap between the fifth lens and the sixth lens along the optical axis.

13. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: -1.48≤d5s / R10+d5m / R11≤5.81, where d5s is the inner diameter of the object side of the fifth spacer element, d5m is the inner diameter of the image side of the fifth spacer element, R10 is the radius of curvature of the image side of the fifth lens, and R11 is the radius of curvature of the object side of the sixth lens.

14. The optical imaging system according to any one of claims 1-13, characterized in that, The optical imaging system satisfies the following condition: 1.01mm < Dis - dis ≤ 4.69mm, where Dis is the outer diameter of the object side of the i-th spacer element, dis is the inner diameter of the object side of the i-th spacer element, and i is selected from 1, 3, 4, or 5.

15. The optical imaging system according to any one of claims 1-13, characterized in that, The plurality of spacers also includes a fifth auxiliary spacer element located on the image side of the fifth spacer element and in contact with the image side portion of the fifth spacer element. The optical imaging system satisfies: 0.3 < d5bm / f56 ≤ 1.26, where d5bm is the inner diameter of the image side of the fifth auxiliary spacer element, and f56 is the combined focal length of the fifth lens and the sixth lens.

16. The optical imaging system according to any one of claims 1-13, characterized in that, The surface of at least one of the first to the third lenses has a point of inflection.

17. The optical imaging system according to any one of claims 1-13, characterized in that, The image-side surface of the first lens has a point of inflection. The optical imaging system satisfies: 0.40≤Yc12 / (D1s-d1s)≤1.01, where Yc12 is the distance between the inflection point on the image side of the first lens and the intersection of the image side of the first lens and the optical axis in a direction perpendicular to the optical axis, and D1s is the outer diameter of the object side of the first spacer element.

18. The optical imaging system according to any one of claims 1-13, characterized in that, The optical imaging system satisfies: DT21 < DT12 < DT51 and 4.14 ≤ d5s / d2s ≤ 4.57, where DT12 is the maximum effective radius of the image side of the first lens, DT21 is the maximum effective radius of the object side of the second lens, DT51 is the maximum effective radius of the object side of the fifth lens, d2s is the inner diameter of the object side of the second spacer element, and d5s is the inner diameter of the object side of the fifth spacer element.

Images