Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with positive optical power; a third lens with positive optical power; a fourth lens with negative optical power; a fifth lens with positive optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power. At least three of the first lens to the fourth lens are made of plastic. The fifth lens is made of glass, and both its object side surface and image side surface are spherical surfaces. The effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, and the effective focal length f7 of the seventh lens satisfy: 0.5 < f1 / (f4 + f7) < 1.3.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of the Chinese invention patent application filed on June 3, 2021, with the invention name “Optical Imaging Lens” and application number 202110618104.9. Technical Field

[0003] The present application relates to the field of optical elements, and more specifically, to an optical imaging lens. Background Art

[0004] As video surveillance develops towards high-definition, from the initial 300,000 pixels to 3 million pixels, global video surveillance technology is ushering in a technological innovation, and surveillance lenses, as the core components of video surveillance, are also beginning to enter a stage of rapid development. Among them, security monitoring systems, as an important development field of video surveillance, are being more and more widely used in the monitoring of many public places such as road traffic industry, production, hospitals, airports, libraries, etc. Security cameras are a vital component of security monitoring systems. However, there are currently few security lenses on the market that have both large aperture and large target surface, and most of them are full-glass lenses, which are relatively expensive. Therefore, the current market development increasingly requires security lenses that can achieve high-definition imaging and have both large aperture and large target surface on the basis of reducing costs. Summary of the invention

[0005] On one hand, the present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with positive optical power; a third lens with optical power; a fourth lens with negative optical power; a fifth lens with optical power; a sixth lens with positive optical power; and a seventh lens with optical power. At least three lenses from the first lens to the fourth lens may be made of plastic. The material of the fifth lens may be glass, and both the object side and the image side of the fifth lens may be spherical. The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy f / EPD<1.25.

[0006] In one embodiment, a distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens along the optical axis may satisfy: 27 mm < TTL < 40 mm.

[0007] In one embodiment, the effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, and the effective focal length f7 of the seventh lens may satisfy: 0.5<f1 / (f4+f7)<1.3.

[0008] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens, and the effective focal length f5 of the fifth lens may satisfy: 1.2 < (f3 + f6) / f5 < 1.9.

[0009] In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the effective focal length f of the optical imaging lens may satisfy: 1.0 < (R1 + R2) / f < 1.5.

[0010] In one embodiment, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens may satisfy: 1.1 < (R11 - R12) / (R11 + R12) < 2.2.

[0011] In one embodiment, the distance T12 between the first lens and the second lens on the optical axis, the distance T23 between the second lens and the third lens on the optical axis, the distance T45 between the fourth lens and the fifth lens on the optical axis, and the distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy: 0.6 < T12 / (T23 + T45 + T56) < 2.5.

[0012] In one embodiment, the maximum effective semi-aperture DT11 of the object side surface of the first lens, the maximum effective semi-aperture DT71 of the object side surface of the seventh lens, and the maximum effective semi-aperture DT31 of the object side surface of the third lens may satisfy: 1.4 < (DT11 + DT71) / DT31 < 1.9.

[0013] In one embodiment, the optical imaging lens further includes a diaphragm, and the distance SL from the diaphragm to the imaging surface along the optical axis and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens may satisfy: 1.1 < SL / f345 < 1.6.

[0014] In one embodiment, the combined focal length f67 of the sixth lens and the seventh lens, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 2.4 < f67 / (CT6 + CT7) < 6.9.

[0015] In one embodiment, the axial distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, the axial distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens, the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and the axial distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens satisfy: 1.0 < (SAG11 + SAG12) / (SAG31 - SAG32) < 1.7.

[0016] In one embodiment, the axial distance SAG51 from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens, the axial distance SAG52 from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, the axial distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens, and the axial distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens satisfy: 0.7 < (SAG51 - SAG52) / (SAG61 - SAG62) < 1.2.

[0017] In one embodiment, the central thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens satisfy: 2.4 < CT3 / ET3 < 3.2.

[0018] In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.8 < (ET1 + ET2) / (ET4 + ET5) < 1.3.

[0019] On the other hand, the present application provides an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with a positive optical power; a third lens with an optical power; a fourth lens with a negative optical power; a fifth lens with an optical power; a sixth lens with a positive optical power; and a seventh lens with an optical power. At least three of the first lens to the fourth lens can be made of plastic. The fifth lens can be made of glass, and both the object side surface and the image side surface of the fifth lens can be spherical surfaces. The effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, and the effective focal length f7 of the seventh lens satisfy: 0.5 < f1 / (f4 + f7) < 1.3.

[0020] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens along the optical axis may satisfy: 27 mm < TTL < 40 mm.

[0021] In one embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy f / EPD < 1.25.

[0022] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens, and the effective focal length f5 of the fifth lens may satisfy: 1.2 < (f3 + f6) / f5 < 1.9.

[0023] In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the effective focal length f of the optical imaging lens may satisfy: 1.0 < (R1 + R2) / f < 1.5.

[0024] In one embodiment, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens may satisfy: 1.1 < (R11 - R12) / (R11 + R12) < 2.2.

[0025] In one embodiment, the spacing distance T12 between the first lens and the second lens on the optical axis, the spacing distance T23 between the second lens and the third lens on the optical axis, the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, and the spacing distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy: 0.6 < T12 / (T23 + T45 + T56) < 2.5.

[0026] In one embodiment, the maximum effective semi-aperture DT11 of the object side surface of the first lens, the maximum effective semi-aperture DT71 of the object side surface of the seventh lens, and the maximum effective semi-aperture DT31 of the object side surface of the third lens may satisfy: 1.4 < (DT11 + DT71) / DT31 < 1.9.

[0027] In one embodiment, the optical imaging lens further includes a diaphragm, and the distance SL from the diaphragm to the imaging surface along the optical axis and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens may satisfy: 1.1 < SL / f345 < 1.6.

[0028] In one embodiment, the combined focal length f67 of the sixth lens and the seventh lens, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 2.4 < f67 / (CT6 + CT7) < 6.9.

[0029] In one embodiment, the axial distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, the axial distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens, the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and the axial distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens may satisfy: 1.0 < (SAG11 + SAG12) / (SAG31 - SAG32) < 1.7.

[0030] In one embodiment, the axial distance SAG51 from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens, the axial distance SAG52 from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, the axial distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens, and the axial distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens may satisfy: 0.7 < (SAG51 - SAG52) / (SAG61 - SAG62) < 1.2.

[0031] In one embodiment, the central thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens may satisfy: 2.4 < CT3 / ET3 < 3.2.

[0032] In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens may satisfy: 0.8 < (ET1 + ET2) / (ET4 + ET5) < 1.3.

[0033] This application adopts a seven - lens structure. By reasonably distributing the optical powers of each lens, optimizing the selection of the surface shapes, thicknesses, and materials of each lens, etc., the lens can have at least one beneficial effect such as a large aperture, high pixel count, low cost, and good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] With reference to the accompanying drawings, other features, objects, and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments. In the drawings:

[0035] Figure 1 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0036] Figures 2A to 2D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 1 are respectively shown;

[0037] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0038] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 2 are respectively shown;

[0039] Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0040] Figures 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 3 are respectively shown;

[0041] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0042] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 4 are respectively shown;

[0043] Figure 9 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0044] Figures 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 5 are respectively shown;

[0045] Figure 11 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown; and

[0046] Figures 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 6 are respectively shown. Detailed Embodiments

[0047] To better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0048] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0049] In the drawings, for the sake of convenience of illustration, the thickness, size and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0050] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. In this document, the surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0051] It should also be understood that the terms "comprise", "comprising", "have", "include" and / or "including", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0052] 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 also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0053] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] The features, principles and other aspects of the present application will be described in detail below.

[0055] The optical imaging lens according to an exemplary embodiment of the present application may include, for example, seven lenses with optical powers, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged in sequence from the object side to the image side along the optical axis.

[0056] In the exemplary embodiment, the first lens may have a positive or negative optical power; the second lens may have a positive optical power; the third lens may have a positive or negative optical power; the fourth lens may have a negative optical power; the fifth lens may have a positive or negative optical power; the sixth lens may have a positive optical power; the seventh lens may have a positive or negative optical power. The cooperation of the second lens with a positive optical power, the fourth lens with a negative optical power, and the sixth lens with a positive optical power helps in the distribution of the optical power, and can improve the image quality of the lens on the basis of meeting the photographic efficacy.

[0057] In the exemplary embodiment, at least three of the first lens to the fourth lens may be made of plastic. Using at least three plastic lenses for the first four lenses is beneficial to reducing the manufacturing cost of the lens.

[0058] In the exemplary embodiment, the material of the fifth lens may be glass. Both the object side surface and the image side surface of the fifth lens may be spherical surfaces.

[0059] In the exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional formula f / EPD < 1.25, where f is the effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens.

[0060] In the exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional formula 27mm < TTL < 40mm, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens. By controlling the distance along the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens within this range, it is possible to avoid the increase in aberration and the resulting reduction in lens performance caused by too short TTL, and at the same time, it is also possible to avoid the overall size of the lens not meeting the structural requirements caused by too long TTL, and can effectively reduce the total size of the lens, so that it can better meet the market demand. More specifically, TTL may satisfy 27mm < TTL < 36mm.

[0061] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.5 < f1 / (f4 + f7) < 1.3, where f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens, and f7 is the effective focal length of the seventh lens. By controlling the ratio of the effective focal length of the first lens to the sum of the effective focal lengths of the fourth lens and the seventh lens within this range, it is beneficial to the overall optical power distribution of the system. It can avoid the risks such as increased sensitivity and reduced yield caused by excessive concentration on the first lens, and also avoid a series of problems such as sensitivity caused by excessive concentration on the subsequent several lenses. More specifically, f1, f4, and f7 can satisfy 0.6 < f1 / (f4 + f7) < 1.1.

[0062] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.2 < (f3 + f6) / f5 < 1.9, where f3 is the effective focal length of the third lens, f6 is the effective focal length of the sixth lens, and f5 is the effective focal length of the fifth lens. By controlling the ratio of the sum of the effective focal lengths of the third lens and the sixth lens to the effective focal length of the fifth lens within this range, it is beneficial to the overall optical power distribution of the system, and can make the lens have better processability, which is beneficial to the subsequent processing and assembly of the lens. More specifically, f3, f6, and f5 can satisfy 1.2 < (f3 + f6) / f5 < 1.8.

[0063] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.0 < (R1 + R2) / f < 1.5, where R1 is the curvature radius of the object side of the first lens, R2 is the curvature radius of the image side of the first lens, and f is the effective focal length of the optical imaging lens. By controlling the ratio of the sum of the curvature radius of the object side of the first lens and the curvature radius of the image side of the first lens to the effective focal length of the optical imaging lens within this range, the astigmatism and coma contribution of the first lens can be controlled within a reasonable range, and the astigmatism and coma left by the previous lenses can be effectively balanced, so that the lens has better imaging quality. More specifically, R1, R2, and f can satisfy 1.1 < (R1 + R2) / f < 1.4.

[0064] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.1 < (R11 - R12) / (R11 + R12) < 2.2, where R11 is the curvature radius of the object side of the sixth lens, and R12 is the curvature radius of the image side of the sixth lens. By controlling the ratio of the difference between the curvature radius of the object side of the sixth lens and the curvature radius of the image side of the sixth lens to the sum of the curvature radius of the object side of the sixth lens and the curvature radius of the image side of the sixth lens within this range, difficulties in the processing technology caused by the overly thin lens of the sixth lens can be avoided. By reasonably adjusting the structural dimensions of the sixth lens, while reducing the system size and maintaining good processability, the influence of system distortion can be balanced. More specifically, R11 and R12 can satisfy 1.2 < (R11 - R12) / (R11 + R12) < 2.2.

[0065] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.6 < T12 / (T23 + T45 + T56) < 2.5, where T12 is the axial distance between the first lens and the second lens, T23 is the axial distance between the second lens and the third lens, T45 is the axial distance between the fourth lens and the fifth lens, and T56 is the axial distance between the fifth lens and the sixth lens. By controlling the ratio of the axial distance between the first lens and the second lens to the sum of the axial distances between the second lens and the third lens, the fourth lens and the fifth lens, and the fifth lens and the sixth lens within this range, it is beneficial to improve the overall large aperture effect of the lens, and can avoid field curvature and chromatic aberration, and at the same time, it is not easy to generate astigmatism and spherical aberration. More specifically, T12, T23, T45, and T56 can satisfy 0.7 < T12 / (T23 + T45 + T56) < 2.4.

[0066] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.4 < (DT11 + DT71) / DT31 < 1.9, where DT11 is the maximum effective semi-aperture of the object side of the first lens, DT71 is the maximum effective semi-aperture of the object side of the seventh lens, and DT31 is the maximum effective semi-aperture of the object side of the third lens. By controlling the ratio of the sum of the maximum effective semi-aperture of the object side of the first lens and the maximum effective semi-aperture of the object side of the seventh lens to the maximum effective semi-aperture of the object side of the third lens within this range, the longitudinal spherical aberration of the system can be improved, the ghost image at the center of the image plane can be improved, so that the system chromatic aberration can be effectively balanced and the difficulties in the processing technology caused by the overly large lens can be avoided. More specifically, DT11, DT71, and DT31 can satisfy 1.5 < (DT11 + DT71) / DT31 < 1.9.

[0067] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.1 < SL / f345 < 1.6, where SL is the distance from the aperture of the optical imaging lens to the imaging surface of the optical imaging lens along the optical axis, and f345 is the combined focal length of the third lens, the fourth lens, and the fifth lens. By controlling the ratio of the distance from the aperture of the optical imaging lens to the imaging surface of the optical imaging lens along the optical axis to the combined focal length of the third lens, the fourth lens, and the fifth lens within this range, the system can further enhance the correction of higher-order composite aberrations on the basis of reducing third-order aberrations such as spherical aberration, coma, and field curvature. In addition, the aperture can be increased, the light passing amount of the optical system can be enhanced, the image plane brightness can be improved, and the image quality can be improved. More specifically, SL and f345 can satisfy 1.2 < SL / f345 < 1.5.

[0068] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 2.4 < f67 / (CT6 + CT7) < 6.9, where f67 is the combined focal length of the sixth lens and the seventh lens, CT6 is the central thickness of the sixth lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. By controlling the ratio of the combined focal length of the sixth lens and the seventh lens to the sum of the central thickness of the sixth lens on the optical axis and the central thickness of the seventh lens on the optical axis within this range, it is beneficial to improve the overall performance of the system, avoid the problem of the overall size of the system increasing due to the excessive thickness of the sixth lens and the seventh lens, and at the same time avoid the risk of reduced processability due to the excessive thinness of the sixth lens and the seventh lens. More specifically, f67, CT6, and CT7 can satisfy 2.5 < f67 / (CT6 + CT7) < 6.8.

[0069] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the condition 1.0 < (SAG11 + SAG12) / (SAG31 - SAG32) < 1.7, where SAG11 is the axial distance from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, SAG12 is the axial distance from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens, SAG31 is the axial distance from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and SAG32 is the axial distance from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens. By controlling the ratio of the sum of the axial distance from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens and the axial distance from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens to the difference between the axial distance from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens and the axial distance from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens within this range, it can help improve the spherical aberration of the middle field of view and the coma of the edge field of view, enabling the system to have better aberration correction ability. It also helps to increase the effective focal length of the system while maintaining the imaging quality of the lens. Moreover, it helps to increase the relative illumination of the system and improve the imaging quality of the lens in a darker environment. More specifically, SAG11, SAG12, SAG31, and SAG32 can satisfy 1.1 < (SAG11 + SAG12) / (SAG31 - SAG32) < 1.7.

[0070] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional expression 0.7 < (SAG51 - SAG52) / (SAG61 - SAG62) < 1.2, where SAG51 is the axial distance from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens, SAG52 is the axial distance from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, SAG61 is the axial distance from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens, and SAG62 is the axial distance from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens. By controlling the ratio of the difference between the axial distance from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens and the axial distance from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens to the difference between the axial distance from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens and the axial distance from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens within this range, it is beneficial to improve the sensitivity of the fifth lens and the sixth lens, and at the same time, while comprehensively improving stray light ghosts, it can maintain good processing manufacturability of the lens, ensuring smooth mass production. More specifically, SAG51, SAG52, SAG61, and SAG62 can satisfy 0.7 < (SAG51 - SAG52) / (SAG61 - SAG62) < 1.1.

[0071] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional expression 2.4 < CT3 / ET3 < 3.2, where CT3 is the central thickness of the third lens on the optical axis and ET3 is the edge thickness of the third lens. By controlling the ratio of the central thickness of the third lens on the optical axis to the edge thickness of the third lens within this range, it is possible to effectively avoid the processing difficulties caused by the third lens being too thin, and at the same time, reduce the system sensitivity and improve the overall yield. More specifically, CT3 and ET3 can satisfy 2.4 < CT3 / ET3 < 3.1.

[0072] In an exemplary embodiment, the optical imaging lens of the present application may satisfy the condition 0.8 < (ET1 + ET2) / (ET4 + ET5) < 1.3, where ET1 is the edge thickness of the first lens, ET2 is the edge thickness of the second lens, ET4 is the edge thickness of the fourth lens, and ET5 is the edge thickness of the fifth lens. By controlling the ratio of the sum of the edge thicknesses of the first lens and the second lens to the sum of the edge thicknesses of the fourth lens and the fifth lens within this range, the longitudinal spherical aberration of the system can be improved, the ghost image at the image plane center can be improved, and at the same time, the stability of the system structure can be enhanced. More specifically, ET1, ET2, ET4, and ET5 may satisfy 0.9 < (ET1 + ET2) / (ET4 + ET5) < 1.2.

[0073] In an exemplary embodiment, the above optical imaging lens may further include at least one aperture stop. The aperture stop can be set at an appropriate position as needed. For example, it can be set between the second lens and the third lens. Optionally, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0074] The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the seven lenses described above. By reasonably distributing the optical power, surface shape, material, central thickness of each lens, and the on-axis spacing between each lens, etc., the lens can have characteristics such as a large aperture, high pixels, low cost, and good imaging quality.

[0075] In an embodiment of the present application, at least one of the mirror surfaces of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens may be an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the fourth lens and the object side surface of the sixth lens to the image side surface of the seventh lens may include an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. 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 sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, both 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 sixth lens, and the seventh lens are aspherical mirror surfaces.

[0076] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0077] Specific embodiments of the optical imaging lens applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0078] Example 1

[0079] The following refers to Figures 1 to 2D Describe the optical imaging lens according to Embodiment 1 of this application. Figure 1 A schematic structural diagram of the optical imaging lens according to Embodiment 1 of this application is shown.

[0080] As Figure 1 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

[0081] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative optical power, its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0082] Table 1 shows the basic parameters of the optical imaging lens of Embodiment 1, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0083]

[0084]

[0085] Table 1

[0086] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the fourth lens E4, the sixth lens E6, and the seventh lens E7 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0087]

[0088] where x is the sagitta, which is the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature 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 2-1 and 2-2 below give the high-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 that can be used for each of the aspherical mirrors S1 to S8 and S11 to S14 in Embodiment 1.

[0089] Face number A4 A6 A8 A10 A12 S1 -2.1157E-03 -2.2595E-05 2.8773E-06 -1.3232E-07 4.3570E-09 S2 -1.3069E-03 -5.2670E-05 1.0070E-05 -1.0569E-06 8.5885E-08 S3 -6.0255E-05 1.0781E-07 -4.8160E-07 -3.5394E-08 1.1013E-09 S4 4.7784E-04 -7.6861E-06 1.5146E-07 -4.2443E-08 1.7884E-09 S5 3.1614E-04 -7.4246E-06 7.1449E-07 -5.7593E-08 2.1728E-09 S6 1.7050E-03 -6.4460E-05 3.9641E-06 -1.9482E-07 6.0804E-09 S7 -3.0431E-03 1.6085E-04 -7.2779E-06 2.1164E-07 -3.9917E-09 S8 -5.9850E-03 3.9385E-04 -2.4739E-05 1.2214E-06 -4.4136E-08 S11 1.7403E-03 -8.2817E-05 5.8346E-06 -2.9641E-07 1.0865E-08 S12 4.6476E-03 -4.4417E-04 4.8347E-05 -3.8966E-06 2.1855E-07 S13 -3.5722E-03 2.5180E-05 -1.1225E-05 2.9763E-06 -3.8976E-07 S14 -8.9386E-03 7.7589E-04 -8.9433E-05 8.8875E-06 -6.6528E-07

[0090] Table 2-1

[0091] Face number A14 A16 A18 A20 S1 -9.8767E-11 1.3148E-12 -7.7816E-15 0.0000E+00 S2 -4.9032E-09 1.8027E-10 -3.8045E-12 3.5250E-14 S3 -2.9719E-11 5.6569E-13 0.0000E+00 0.0000E+00 S4 -4.0308E-11 6.7521E-13 -6.3304E-15 0.0000E+00 S5 -4.6130E-11 5.5421E-13 -2.9261E-15 0.0000E+00 S6 -1.1484E-10 1.2334E-12 -5.8078E-15 0.0000E+00 S7 5.0635E-11 -4.2996E-13 2.2168E-15 -5.1706E-18 S8 1.0937E-09 -1.6949E-11 1.3531E-13 -1.8689E-16 S11 -2.5546E-10 3.3066E-12 -1.7964E-14 0.0000E+00 S12 -8.1149E-09 1.8466E-10 -2.2901E-12 1.1718E-14 S13 2.8492E-08 -1.2098E-09 2.7799E-11 -2.6455E-13 S14 3.4363E-08 -1.1329E-09 2.1268E-11 -1.7148E-13

[0092] Table 2-2

[0093] Figure 2A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of the convergence focal points of light rays with different wavelengths after passing through the lens. Figure 2B shows the astigmatism curve of the optical imaging lens of Embodiment 1, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2C shows the distortion curve of the optical imaging lens of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 2A to 2D it can be seen that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0094] Example 2

[0095] The following refers to Figures 3 to 4D to describe the optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application.

[0096] As shown Figure 3 in the figure, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

[0097] The first lens E1 has a negative focal power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a positive focal power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface. The third lens E3 has a positive focal power, its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative focal power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive focal power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The sixth lens E6 has a positive focal power, its object side surface S11 is a convex surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a negative focal power, its object side surface S13 is a convex surface, and its image side surface S14 is a concave surface. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from an object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0098] Table 3 shows the basic parameters of the optical imaging lens of Example 2, where the units of the radius of curvature and the thickness / distance are both millimeters (mm). Tables 4-1 and 4-2 show the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , and A 20 that can be used for each of the aspherical mirror surfaces S1 to S8 and S11 to S14 in Example 2, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0099]

[0100] Table 3

[0101] Face number A4 A6 A8 A10 A12 S1 -1.8287E-03 -1.2328E-05 1.4752E-06 -4.0340E-08 1.0778E-09 S2 -1.4049E-03 -3.9926E-05 6.9088E-06 -9.0651E-07 9.9191E-08 S3 -1.4438E-04 -2.2217E-05 -9.9606E-07 2.9418E-08 -1.9263E-09 S4 6.5540E-05 -2.0489E-06 -7.4358E-07 3.8067E-08 -1.1963E-09 S5 4.8961E-05 3.4026E-06 9.2977E-09 -1.4857E-09 -4.5515E-11 S6 1.0031E-03 -2.8164E-05 1.2069E-06 -3.4579E-08 5.0887E-10 S7 -3.5686E-03 2.0208E-04 -8.8493E-06 2.5869E-07 -4.8729E-09 S8 -6.1171E-03 4.2538E-04 -2.6698E-05 1.3500E-06 -5.1550E-08 S11 8.8433E-04 -5.9321E-05 5.3286E-06 -3.0275E-07 1.0734E-08 S12 4.2027E-03 -3.2375E-04 2.3538E-05 -1.2609E-06 4.6222E-08 S13 -4.0383E-03 2.5517E-04 -3.6709E-05 4.0425E-06 -3.1949E-07 S14 -1.1000E-02 1.3080E-03 -1.7030E-04 1.8134E-05 -1.4265E-06

[0102] Table 4-1

[0103] Face number A14 A16 A18 A20 S1 -3.0654E-11 5.2492E-13 -3.3625E-15 0.0000E+00 S2 -6.9631E-09 2.9372E-10 -6.8073E-12 6.7282E-14 S3 7.5601E-11 -1.2915E-12 0.0000E+00 0.0000E+00 S4 2.1647E-11 -1.5844E-13 -2.5139E-16 0.0000E+00 S5 1.2571E-12 -7.2128E-15 0.0000E+00 0.0000E+00 S6 -3.6474E-12 1.0179E-14 0.0000E+00 0.0000E+00 S7 5.7455E-11 -4.0471E-13 1.5406E-15 -2.4111E-18 S8 1.3910E-09 -2.4464E-11 2.4759E-13 -1.0812E-15 S11 -2.3903E-10 3.2054E-12 -2.3416E-14 7.1195E-17 S12 -1.1083E-09 1.6226E-11 -1.2649E-13 3.7239E-16 S13 1.6418E-08 -5.1655E-10 9.0324E-12 -6.7143E-14 S14 7.6989E-08 -2.6422E-09 5.1430E-11 -4.2908E-13

[0104] Table 4-2

[0105] Figure 4A shows the axial chromatic aberration curve of the optical imaging lens of Example 2, which represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the lens. Figure 4BThe astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4C The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4D The longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 4A to 4D It can be seen that the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0106] Example 3

[0107] The following is a reference to Figures 5 to 6D The optical imaging lens according to Embodiment 3 of the present application is described. Figure 5 The structural schematic diagram of the optical imaging lens according to Embodiment 3 of the present application is shown.

[0108] As Figure 5 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

[0109] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative optical power, its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from an object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0110] Table 5 shows the basic parameters of the optical imaging lens of Embodiment 3, where the units of the radius of curvature and the thickness / distance are both millimeters (mm). Tables 6-1 and 6-2 show the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、and A 20, wherein each aspherical surface type can be defined by formula (1) given in Embodiment 1 above.

[0111]

[0112] Table 5

[0113] Face number A4 A6 A8 A10 A12 S1 -1.5157E-03 -1.0078E-05 8.8988E-07 -8.6859E-09 -9.0974E-10 S2 -8.6330E-04 -2.5297E-05 3.7494E-06 -2.7663E-07 2.1185E-08 S3 -1.9227E-04 -2.6407E-05 1.6961E-06 -1.1663E-07 4.8641E-09 S4 5.2369E-04 -4.5180E-05 2.8755E-06 -1.3663E-07 3.8841E-09 S5 6.5101E-04 -7.2416E-05 5.9750E-06 -3.4519E-07 1.3327E-08 S6 1.7909E-03 -1.0610E-04 7.4532E-06 -3.9634E-07 1.4458E-08 S7 -2.9424E-03 1.9872E-04 -1.3119E-05 7.1576E-07 -3.2098E-08 S8 -5.7806E-03 5.0108E-04 -4.4325E-05 3.2421E-06 -1.7985E-07 S11 1.5332E-03 -8.2958E-05 8.5444E-06 -7.7410E-07 4.9549E-08 S12 4.2858E-03 -2.2033E-04 5.5377E-06 6.3593E-07 -9.2881E-08 S13 -5.3921E-03 3.5544E-04 -3.9982E-05 2.8221E-06 -1.2015E-07 S14 -1.1260E-02 1.2534E-03 -1.5128E-04 1.4344E-05 -1.0080E-06

[0114] Table 6-1

[0115] Face number A14 A16 A18 A20 S1 3.7934E-11 -6.0244E-13 3.4682E-15 0.0000E+00 S2 -1.2954E-09 4.8161E-11 -9.4663E-13 7.5138E-15 S3 -1.7004E-10 2.7843E-12 0.0000E+00 0.0000E+00 S4 -6.5657E-11 5.9126E-13 -9.5930E-16 0.0000E+00 S5 -3.3656E-10 5.0173E-12 -3.3045E-14 0.0000E+00 S6 -3.3907E-10 4.6311E-12 -2.7871E-14 0.0000E+00 S7 1.0898E-09 -2.4855E-11 3.3245E-13 -1.9754E-15 S8 7.0595E-09 -1.8144E-10 2.7147E-12 -1.7873E-14 S11 -2.1340E-09 5.7785E-11 -8.7421E-13 5.6100E-15 S12 5.7079E-09 -1.9421E-10 3.5918E-12 -2.8354E-14 S13 1.5913E-09 9.3569E-11 -4.1689E-12 4.9013E-14 S14 4.9763E-08 -1.6094E-09 3.0457E-11 -2.5538E-13

[0116] Table 6-2

[0117] Figure 6A The axial chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6C The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 6D The longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 6A to 6D it can be known that the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0118] Example 4

[0119] The following refers to Figures 7 to 8D to describe the optical imaging lens according to Embodiment 4 of the present application. Figure 7 The structural schematic diagram of the optical imaging lens according to Embodiment 4 of the present application is shown.

[0120] As Figure 7 shown, the optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

[0121] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive optical power, its object side S3 is concave, and its image side S4 is convex. The third lens E3 has a positive optical power, its object side S5 is convex, and its image side S6 is convex. The fourth lens E4 has a negative optical power, its object side S7 is convex, and its image side S8 is concave. The fifth lens E5 has a positive optical power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a positive optical power, its object side S11 is convex, and its image side S12 is convex. The seventh lens E7 has a negative optical power, its object side S13 is convex, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. The optical imaging lens has an imaging surface S17, and the light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0122] Table 7 shows the basic parameters of the optical imaging lens of Embodiment 4, where the units of the radius of curvature and the thickness / distance are both millimeters (mm). Tables 8-1 and 8-2 show the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 that can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in Embodiment 4, where the aspherical surface profiles can be defined by the formula (1) given in Embodiment 1 above.

[0123]

[0124]

[0125] Table 7

[0126] Face number A4 A6 A8 A10 A12 S1 -1.0328E-03 -6.3203E-06 4.2715E-07 -9.8065E-09 1.8889E-10 S2 -5.9132E-04 -1.3187E-05 1.1393E-06 -6.7014E-08 4.2020E-09 S3 1.7401E-05 -6.1256E-06 1.9048E-07 -4.2166E-08 1.9767E-09 S4 4.1316E-04 -1.1024E-05 3.2709E-07 -2.1224E-08 5.8868E-10 S5 2.8896E-04 -1.1178E-05 5.6203E-07 -2.8457E-08 8.2895E-10 S6 1.1047E-03 -4.0287E-05 1.7937E-06 -6.1404E-08 1.3414E-09 S7 -1.4467E-03 6.6731E-05 -3.4822E-06 1.5275E-07 -5.2118E-09 S8 -3.1327E-03 1.6870E-04 -9.6776E-06 4.6681E-07 -1.6918E-08 S11 1.0320E-03 -4.6246E-05 3.2892E-06 -2.1055E-07 1.0338E-08 S12 2.5425E-03 -1.2469E-04 6.0638E-06 -2.3246E-07 7.0067E-09 S13 -3.1470E-03 9.0742E-05 -7.0080E-06 3.5498E-07 -1.1617E-08 S14 -6.7816E-03 4.9447E-04 -4.1505E-05 2.7378E-06 -1.3061E-07

[0127] Table 8-1

[0128]

[0129]

[0130] Table 8-2

[0131] Figure 8A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 4, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 8B shows the astigmatism curve of the optical imaging lens of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8CThe distortion curve of the optical imaging lens according to Embodiment 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 8D The longitudinal chromatic aberration curve of the optical imaging lens according to Embodiment 4 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. According to Figures 8A to 8D it can be seen that the optical imaging lens given in Embodiment 4 can achieve good imaging quality.

[0132] Example 5

[0133] The following is a reference to Figures 9 to 10D to describe the optical imaging lens according to Embodiment 5 of the present application. Figure 9 The schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application is shown.

[0134] As Figure 9 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

[0135] The first lens E1 has a negative optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a positive optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface. The third lens E3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The sixth lens E6 has a positive optical power, its object side surface S11 is a convex surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a negative optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a concave surface. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from an object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0136] Table 9 shows the basic parameters of the optical imaging lens according to Embodiment 5, where the units of the radius of curvature and the thickness / distance are both millimeters (mm). Tables 10-1 and 10-2 show the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 that can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in Embodiment 5, where the aspherical surface types can be defined by the formula (1) given in Embodiment 1 above.

[0137]

[0138]

[0139] Table 9

[0140] Face number A4 A6 A8 A10 A12 S1 -1.5342E-03 -1.0231E-05 3.7384E-07 -8.1468E-09 9.8791E-10 S2 -8.7728E-04 -1.1234E-05 -1.2836E-07 4.4162E-08 -3.1551E-10 S3 -4.8384E-04 2.2808E-05 -1.2136E-06 -1.0758E-07 9.5853E-09 S4 3.1025E-04 2.4130E-05 -3.7182E-06 1.8849E-07 -5.3767E-09 S5 4.3024E-04 1.5960E-05 -3.7340E-06 2.1357E-07 -6.8998E-09 S6 1.9937E-03 -9.6641E-05 4.2396E-06 -1.6033E-07 5.1446E-09 S7 -2.1566E-03 1.3624E-04 -1.0665E-05 5.7319E-07 -1.9402E-08 S8 -5.6900E-03 4.7804E-04 -4.0914E-05 2.8518E-06 -1.4987E-07 S11 1.6280E-03 -7.7082E-05 8.8087E-06 -7.8585E-07 4.8463E-08 S12 3.7680E-03 -7.0028E-05 -2.3619E-05 4.6959E-06 -4.7252E-07 S13 -5.8700E-03 4.2259E-04 -6.6298E-05 7.6534E-06 -6.7575E-07 S14 -1.1278E-02 1.1341E-03 -1.2317E-04 9.6716E-06 -4.2052E-07

[0141] Table 10-1

[0142] Face number A14 A16 A18 A20 S1 -4.0486E-11 6.3260E-13 -2.9731E-15 0.0000E+00 S2 -3.9833E-11 9.6883E-13 0.0000E+00 0.0000E+00 S3 -3.0479E-10 3.3117E-12 0.0000E+00 0.0000E+00 S4 9.4322E-11 -1.0914E-12 7.3619E-15 0.0000E+00 S5 1.3356E-10 -1.4374E-12 6.8219E-15 0.0000E+00 S6 -1.1615E-10 1.5453E-12 -8.7631E-15 0.0000E+00 S7 4.0137E-10 -4.4655E-12 1.4571E-14 9.6060E-17 S8 5.6451E-09 -1.4243E-10 2.1400E-12 -1.4431E-14 S11 -2.0138E-09 5.2413E-11 -7.1948E-13 2.9391E-15 S12 2.8874E-08 -1.0731E-09 2.2328E-11 -2.0028E-13 S13 4.1969E-08 -1.6550E-09 3.6574E-11 -3.4155E-13 S14 -7.2451E-10 1.2339E-09 -6.3289E-11 1.0964E-12

[0143] Table 10-2

[0144] Figure 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of the convergence focal points of light rays with different wavelengths after passing through the lens. Figure 10B The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10C The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 10D The lateral chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 10A to 10D it can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0145] Example 6

[0146] The following refers to Figures 11 to 12D the optical imaging lens according to Embodiment 6 of the present application is described. Figure 11 The structural schematic diagram of the optical imaging lens according to Embodiment 6 of the present application is shown.

[0147] As Figure 11 shown, the optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8.

[0148] The first lens E1 has a negative focal power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive focal power, its object side S3 is concave, and its image side S4 is convex. The third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is convex. The fourth lens E4 has a negative focal power, its object side S7 is convex, and its image side S8 is concave. The fifth lens E5 has a positive focal power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a positive focal power, its object side S11 is convex, and its image side S12 is convex. The seventh lens E7 has a negative focal power, its object side S13 is convex, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. The optical imaging lens has an imaging surface S17, and the light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0149] Table 11 shows the basic parameters of the optical imaging lens of Example 6, where the units of the radius of curvature and the thickness / distance are both millimeters (mm). Tables 12-1 and 12-2 show the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 that can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in Example 6, where the aspherical surface profiles can be defined by the formula (1) given in the above Example 1.

[0150]

[0151] Table 11

[0152]

[0153]

[0154] Table 12-1

[0155] Face number A14 A16 A18 A20 S1 1.3147E-10 -2.2546E-12 1.6299E-14 0.0000E+00 S2 -7.1309E-10 3.2686E-11 -6.7424E-13 5.1537E-15 S3 -5.1456E-10 8.1264E-12 0.0000E+00 0.0000E+00 S4 3.0521E-10 -5.5506E-12 4.2662E-14 0.0000E+00 S5 1.5841E-10 -1.9112E-12 8.8307E-15 0.0000E+00 S6 -1.9021E-10 1.8290E-12 -7.0963E-15 0.0000E+00 S7 1.9996E-09 -4.6325E-11 5.9956E-13 -3.3005E-15 S8 7.4680E-09 -1.8432E-10 2.6164E-12 -1.6158E-14 S11 -4.3816E-09 1.3483E-10 -2.3529E-12 1.7581E-14 S12 3.3844E-09 -8.4322E-11 9.6636E-13 -2.8470E-15 S13 1.6591E-08 -5.5171E-10 1.1567E-11 -1.1858E-13 S14 8.0983E-08 -3.2621E-09 7.8828E-11 -8.5424E-13

[0156] Table 12-2

[0157] Figure 12A shows the axial chromatic aberration curve of the optical imaging lens of Example 6, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the optical imaging lens of Example 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the distortion curve of the optical imaging lens of Example 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12DThe chromatic aberration of magnification curve of the optical imaging lens according to Embodiment 6 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. According to Figures 12A to 12D it can be known that the optical imaging lens given in Embodiment 6 can achieve good imaging quality.

[0158] In addition, in Embodiments 1 to 6, the effective focal length values f1 to f7 of each lens, the effective focal length f of the optical imaging lens, the distance TTL along the optical axis from the object side surface of the first lens of the optical imaging lens to the imaging surface of the optical imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging lens, and the maximum field of view angle FOV of the optical imaging lens are shown in Table 13.

[0159]

[0160]

[0161] Table 13 The conditional expressions in Embodiments 1 to 6 respectively satisfy the conditions shown in Table 14.

[0162] Conditional / Example 1 2 3 4 5 6 f / EPD 0.95 0.95 1.20 0.95 0.95 0.90 TTL (mm) 31.00 31.00 33.34 35.50 28.00 28.00 f1 / (f4 + f7) 0.67 0.79 0.85 0.87 0.98 1.05 (f3 + f6) / f5 1.40 1.30 1.48 1.65 1.59 1.70 (R1 + R2) / f 1.24 1.34 1.15 1.29 1.30 1.31 (R11 - R12) / (R11 + R12) 2.11 1.74 1.27 1.47 1.27 1.35 T12 / (T23 + T45 + T56) 0.95 2.19 0.74 0.77 1.70 2.35 (DT11 + DT71) / DT31 1.58 1.69 1.83 1.66 1.66 1.65 SL / f345 1.25 1.23 1.36 1.34 1.27 1.41 f67 / (CT6 + CT7) 4.38 2.51 6.19 5.40 6.25 6.74 (SAG11 + SAG12) / (SAG31 - SAG32) 1.14 1.21 1.61 1.35 1.43 1.44 (SAG51 - SAG52) / (SAG61 - SAG62) 0.92 0.79 0.88 0.88 0.87 1.03 CT3 / ET3 2.97 2.50 2.68 2.98 2.61 2.81 (ET1 + ET2) / (ET4 + ET5) 1.06 0.96 0.93 1.11 1.06 0.99

[0163] Table 14

[0164] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device 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 lens described above.

[0165] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the protection scope involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that, It sequentially includes, from the object side to the image side along the optical axis: A first lens with a negative optical power, whose object side is convex and image side is concave; A second lens with a positive optical power, whose object side is concave and image side is convex; A third lens with a positive optical power, whose object side is convex and image side is convex; A fourth lens with a negative optical power, whose object side is convex and image side is concave; A fifth lens with a positive optical power, whose object side is convex and image side is convex; A sixth lens with a positive optical power, whose object side is convex and image side is convex; and A seventh lens with a negative optical power, whose object side is convex and image side is concave, The optical imaging lens satisfies: The number of lenses with optical power in the optical imaging lens is seven; At least three of the first lens to the fourth lens are made of plastic; The fifth lens is made of glass, and both the object side and the image side of the fifth lens are spherical surfaces; and 0.67 ≤ f1 / (f4 + f7) ≤ 1.05, where f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens, and f7 is the effective focal length of the seventh lens.

2. The optical imaging lens according to claim 1, wherein The distance TTL along the optical axis from the object side of the first lens to the imaging surface of the optical imaging lens satisfies: 28.00mm ≤ TTL ≤ 35.50mm.

3. The optical imaging lens according to claim 2, characterized in that, The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 0.90 ≤ f / EPD ≤ 1.

20.

4. The optical imaging lens according to claim 1, wherein, The effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens, and the effective focal length f5 of the fifth lens satisfy: 1.30 ≤ (f3 + f6) / f5 ≤ 1.

70.

5. The optical imaging lens according to claim 1, wherein The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, and the effective focal length f of the optical imaging lens satisfy: 1.15 ≤ (R1 + R2) / f ≤ 1.

34.

6. The optical imaging lens according to claim 1, wherein The radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: 1.27 ≤ (R11 - R12) / (R11 + R12) ≤ 2.

11.

7. The optical imaging lens according to claim 1, characterized in that, The interval distance T12 between the first lens and the second lens on the optical axis, the interval distance T23 between the second lens and the third lens on the optical axis, the interval distance T45 between the fourth lens and the fifth lens on the optical axis, and the interval distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.7 < T12 / (T23 + T45 + T56) ≤ 2.

35.

8. The optical imaging lens according to any one of claims 1 to 7, characterized in that The maximum effective semi-aperture DT11 of the object side of the first lens, the maximum effective semi-aperture DT71 of the object side of the seventh lens, and the maximum effective semi-aperture DT31 of the object side of the third lens satisfy: 1.58 ≤ (DT11 + DT71) / DT31 ≤ 1.

83.

9. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The optical imaging lens further includes a diaphragm, and the distance SL along the optical axis from the diaphragm to the imaging surface of the optical imaging lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 1.2 < SL / f345 ≤ 1.

41.

10. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The combined focal length f67 of the sixth lens and the seventh lens, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 2.5 < f67 / (CT6 + CT7) ≤ 6.

74.

11. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The axial distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, the axial distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens, and the axial distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens satisfy: 1.1 < (SAG11 + SAG12) / (SAG31 - SAG32) ≤ 1.

61.

12. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The axial distance SAG51 from the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens, the axial distance SAG52 from the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens, the axial distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the effective radius vertex of the object side surface of the sixth lens, and the axial distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens satisfy: 0.79 ≤ (SAG51 - SAG52) / (SAG61 - SAG62) ≤ 1.

03.

13. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The central thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens satisfy: 2.50 ≤ CT3 / ET3 ≤ 2.

98.

14. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.9 < (ET1 + ET2) / (ET4 + ET5) ≤ 1.11.

Images