Optical imaging lens

Abstract

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 group with positive optical power, including a first lens; a second lens group with positive optical power, which sequentially includes, from the first lens to the image side along the optical axis: a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein the second lens has positive optical power; the object side surface of the sixth lens is convex and the image side surface is concave; the seventh lens has positive optical power; the eighth lens has negative optical power; half of the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the optical imaging lens, ImgH, and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy: TTL / ImgH < 1.3; at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the eighth lens is an aspherical surface.

Description

[0001] Divisional Application Statement

[0002] This application is a divisional application of the Chinese invention patent application with the invention title "Optical Imaging Lens", application number 202110733100.5, which was filed on June 28, 2021. Technical Field

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

[0004] With the rapid development of portable electronic products such as smart phones, the photosensitive chips in the camera modules mounted on portable electronic products are also being updated. Correspondingly, higher requirements are put forward for the imaging ability and structure of the optical imaging lenses in the camera modules to match the needs of the photosensitive chips. In the future field of optical imaging lenses, in order to meet the market needs, optical imaging lenses with high pixels, high imaging quality and small size characteristics will become the main development trend in the lens field. Summary of the Invention

[0005] This application also provides an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens group with positive optical power, including a first lens; a second lens group with positive optical power, which sequentially includes, from the first lens to the image side along the optical axis: a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the second lens has positive optical power; the object side surface of the sixth lens is convex and the image side surface is concave; the seventh lens has positive optical power; the eighth lens has negative optical power; half of the diagonal length ImgH of the effective pixel area of the photosensitive element on the imaging surface of the optical imaging lens and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy: TTL / ImgH < 1.3; at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the eighth lens is an aspherical surface.

[0006] In some embodiments, the effective focal length FG2 of the second lens group and the effective focal length FG1 of the first lens group may satisfy: 2.7 < FG2 / FG1 < 4.2.

[0007] In some embodiments, the total effective focal length f of the optical imaging lens and the maximum field of view FOV of the optical imaging lens may satisfy: 6.0 mm < f×tan(FOV / 2) < 7.0 mm.

[0008] In some embodiments, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens may satisfy: 1.0 < f1 / (R1 + R2) < 1.5.

[0009] In some embodiments, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0 < f3 / (f5 + f6) < 1.5.

[0010] In some embodiments, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens may satisfy: 1.0 < (R5 + R6) / (R3 + R4) < 1.5.

[0011] In some embodiments, the effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, the radius of curvature R13 of the object side surface of the seventh lens, and the radius of curvature R16 of the image side surface of the eighth lens may satisfy: 1.2 < (f7 - f8) / (R13 + R16) < 1.8.

[0012] In some embodiments, the central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the spacing distance T78 between the seventh lens and the eighth lens on the optical axis may satisfy: 1.2 < (CT7 + CT8) / T78 < 1.8.

[0013] In some embodiments, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens, and the seventh lens may satisfy: 4.1 < f34 / f567 < 7.6.

[0014] In some embodiments, the distance SAG61 on the optical axis 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, the distance SAG62 on the optical axis 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, the distance SAG51 on the optical axis 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 distance SAG52 on the optical axis 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 may satisfy: 0.7 < (SAG61 + SAG62) / (SAG51 + SAG52) < 1.6.

[0015] In some embodiments, the central thickness CT4 of the fourth lens on the optical axis, the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, and the edge thickness ET4 of the fourth lens may satisfy: 1.0 < CT4 / (T45 + ET4) < 1.6.

[0016] In some embodiments, the edge thickness ET8 of the eighth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.8 < ET8 / (ET5 + ET6 + ET7) < 1.5.

[0017] In some embodiments, the first lens may be formed of glass.

[0018] In some embodiments, the Abbe number of the first lens may satisfy: 58 < V1 < 70.

[0019] In some embodiments, the object side surface and the image side surface of the first lens may be aspherical surfaces.

[0020] The present application adopts an eight-lens optical imaging lens architecture. By reasonably allocating the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the above optical imaging lens has at least one beneficial effect such as high pixel, high imaging quality, compact structure, and miniaturization. Description of the Drawings

[0021] In conjunction with the accompanying drawings, through the following detailed description of non-limiting embodiments, other features, objectives, and advantages of the present application will become more apparent. In the drawings:

[0022] Figure 1 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0023] Figures 2A to 2B The astigmatism curve and distortion curve of the optical imaging lens of Embodiment 1 are respectively shown;

[0024] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0025] Figures 4A to 4B The astigmatism curve and distortion curve of the optical imaging lens of Embodiment 2 are respectively shown;

[0026] Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0027] Figures 6A to 6B The astigmatism curve and distortion curve of the optical imaging lens of Embodiment 3 are respectively shown;

[0028] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0029] Figures 8A to 8B The astigmatism curve and distortion curve of the optical imaging lens of Embodiment 4 are respectively shown;

[0030] Figure 9 shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application; and

[0031] Figures 10A to 10B respectively show the astigmatism curve and distortion curve of the optical imaging lens of Embodiment 5. Detailed Embodiment

[0032] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. 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.

[0034] In the drawings, for ease of illustration, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0035] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The 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.

[0036] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing 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.

[0037] 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.

[0038] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will describe this application in detail with reference to the drawings and in conjunction with the embodiments.

[0039] The features, principles and other aspects of this application will be described in detail below.

[0040] An optical imaging lens according to an exemplary embodiment of this application includes a first lens group and a second lens group. The first lens group and the second lens group may be arranged in sequence from the object side to the image side along the optical axis.

[0041] In an exemplary embodiment, the first lens group has a positive optical power, and it may include, for example, a lens with optical power, that is, the first lens. Exemplarily, the first lens may have a positive optical power. When the first lens group includes multiple lenses, the first lens is the lens closest to the object side. The first lens group can be assembled separately by using an inclination calibration device when the calibration effect reaches the preset performance requirements, so the first lens group has the function of correcting the imaging quality problems caused by inclination alone.

[0042] In an exemplary embodiment, the second lens group has a positive optical power, and it may include, for example, seven lenses with optical power, that is, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the sixth lens and the seventh lens. These seven lenses are arranged in sequence from the first lens to the image side along the optical axis. An air gap may exist between any two adjacent lenses among the second lens to the eighth lens.

[0043] In an exemplary embodiment, the second lens may have a positive optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive optical power or a negative optical power; the fifth lens may have a positive optical power or a negative optical power; the sixth lens may have a positive optical power or a negative optical power, its object side surface may be convex, and its image side surface may be concave; the seventh lens may have a positive optical power; the eighth lens may have a negative optical power. By reasonably distributing the positive and negative optical powers of each lens, the low-order aberrations of the optical imaging lens can be effectively balanced.

[0044] 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, between the object side and the first lens.

[0045] In an exemplary embodiment, the optical imaging lens may satisfy 5mm < ImgH×ImgH / TTL < 10mm, where ImgH is half of the diagonal length of the effective pixel region of the photosensitive element on the imaging surface of the optical imaging lens, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens. The optical imaging lens satisfying 5mm < ImgH×ImgH / TTL < 10mm can achieve the characteristics of ultra-thinness and high pixels of the optical imaging lens. More specifically, ImgH and TTL may further satisfy: 5mm < ImgH×ImgH / TTL < 7mm.

[0046] In an exemplary embodiment, the optical imaging lens may satisfy 2.7 < FG2 / FG1 < 4.2, where FG2 is the effective focal length of the second lens group and FG1 is the effective focal length of the first lens group. The optical imaging lens satisfying 2.7 < FG2 / FG1 < 4.2 is beneficial to improving the imaging quality, while reducing the optical power of the first lens and reducing the error sensitivity of product manufacturing.

[0047] In an exemplary embodiment, the optical imaging lens may satisfy TTL / ImgH < 1.3, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel region of the photosensitive element on the imaging surface of the optical imaging lens. The optical imaging lens satisfying TTL / ImgH < 1.3 can make the optical imaging structure compact, meet the requirements of miniaturization, and at the same time enable the optical imaging lens to have the functional characteristics of high pixels and large apertures.

[0048] In an exemplary embodiment, the optical imaging lens may satisfy 6.0mm < f×tan(FOV / 2) < 7.0mm, where f is the total effective focal length of the optical imaging lens and FOV is the maximum field of view angle of the optical imaging lens. The optical imaging lens satisfying 6.0mm < f×tan(FOV / 2) < 7.0mm can achieve the imaging effect of the optical imaging lens with a large image surface.

[0049] In an exemplary embodiment, the optical imaging lens may satisfy 1.0 < f1 / (R1+R2) < 1.5, where f1 is the effective focal length of the first lens, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens. The optical imaging lens satisfying 1.0 < f1 / (R1+R2) < 1.5 can control the deflection angle of the marginal field of view in the first lens and can effectively reduce the sensitivity of the optical imaging lens. More specifically, f1, R1, and R2 may further satisfy: 1.1 < f1 / (R1+R2) < 1.3.

[0050] In an exemplary embodiment, the optical imaging lens may satisfy 0 < f3 / (f5 + f6) < 1.5, where f3 is the effective focal length of the third lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. The optical imaging lens satisfying 0 < f3 / (f5 + f6) < 1.5 is conducive to compressing the total length of the optical imaging lens, realizing miniaturization of the optical imaging lens, and at the same time avoiding an increase in the tolerance sensitivity of the lens caused by excessive concentration of the optical power. More specifically, f3, f5, and f6 may further satisfy: 0.1 < f1 / (R1 + R2) < 1.4.

[0051] In an exemplary embodiment, the optical imaging lens may satisfy 1.0 < (R5 + R6) / (R3 + R4) < 1.5, where R5 is the curvature radius of the object side of the third lens, R6 is the curvature radius of the image side of the third lens, R3 is the curvature radius of the object side of the second lens, and R4 is the curvature radius of the image side of the second lens. The optical imaging lens satisfying 1.0 < (R5 + R6) / (R3 + R4) < 1.5 can reasonably control the deflection angle of the marginal rays of the optical imaging lens and effectively reduce the sensitivity of the lens. More specifically, R5, R6, R3, and R4 may further satisfy: 1.1 < (R5 + R6) / (R3 + R4) < 1.4.

[0052] In an exemplary embodiment, the optical imaging lens may satisfy 1.2 < (f7 - f8) / (R13 + R16) < 1.8, where f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, R13 is the curvature radius of the object side of the seventh lens, and R16 is the curvature radius of the image side of the eighth lens. The optical imaging lens satisfying 1.2 < (f7 - f8) / (R13 + R16) < 1.8 is conducive to better correcting chromatic aberration and improving the imaging quality. At the same time, it avoids an increase in the tolerance sensitivity of the optical imaging lens caused by excessive concentration of the optical power and excessive surface curvature. More specifically, f7, f8, R13, and R16 may further satisfy: 1.3 < (f7 - f8) / (R13 + R16) < 1.7.

[0053] In an exemplary embodiment, the optical imaging lens may satisfy 1.2 < (CT7 + CT8) / T78 < 1.8, where CT7 is the central thickness of the seventh lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, and T78 is the distance between the seventh lens and the eighth lens on the optical axis. The optical imaging lens satisfying 1.2 < (CT7 + CT8) / T78 < 1.8 can reasonably regulate the distortion amount of the optical imaging lens, so that the distortion of the lens is within a reasonable range. More specifically, CT7, CT8, and T78 may further satisfy: 1.3 < (CT7 + CT8) / T78 < 1.7.

[0054] In an exemplary embodiment, the optical imaging lens may satisfy 4.1 < f34 / f567 < 7.6, where f34 is the combined focal length of the third lens and the fourth lens, and f567 is the combined focal length of the fifth lens, the sixth lens, and the seventh lens. The optical imaging lens satisfying 4.1 < f34 / f567 < 7.6 is beneficial to controlling the aberration contributions of these two groups of lenses and to balancing the aberration generated by the optical elements at the front end, so that the aberration of the optical imaging lens is within a reasonable range. More specifically, f34 and f567 may further satisfy: 4.3 < f34 / f567 < 7.5.

[0055] In an exemplary embodiment, the optical imaging lens may satisfy 0.7 < (SAG61 + SAG62) / (SAG51 + SAG52) < 1.6, where SAG61 is the 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 on the optical axis, SAG62 is the 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 on the optical axis, SAG51 is the 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 on the optical axis, and SAG52 is the 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 on the optical axis. The optical imaging lens satisfying 0.7 < (SAG61 + SAG62) / (SAG51 + SAG52) < 1.6 is beneficial to better balancing the relationship between the miniaturization of the optical imaging lens and the relative illuminance of the off-axis field of view. More specifically, SAG61, SAG62, SAG51, and SAG52 may further satisfy: 0.8 < (SAG61 + SAG62) / (SAG51 + SAG52) < 1.5.

[0056] In an exemplary embodiment, the optical imaging lens may satisfy 1.0 < CT4 / (T45 + ET4) < 1.6, where CT4 is the central thickness of the fourth lens on the optical axis, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and ET4 is the edge thickness of the fourth lens. The optical imaging lens satisfying 1.0 < CT4 / (T45 + ET4) < 1.6 is beneficial to improving the processing manufacturability of the first lens and the second lens and reducing the difficulty of molding manufacturing. More specifically, CT4, T45, and ET4 may further satisfy: 1.1 < CT4 / (T45 + ET4) < 1.5.

[0057] In an exemplary embodiment, the optical imaging lens may satisfy 0.8 < ET8 / (ET5 + ET6 + ET7) < 1.5, where ET8 is the edge thickness of the eighth lens, ET5 is the edge thickness of the fifth lens, ET6 is the edge thickness of the sixth lens, and ET7 is the edge thickness of the seventh lens. The optical imaging lens satisfying 0.8 < ET8 / (ET5 + ET6 + ET7) < 1.5 can effectively control the edge structure of the optical imaging lens group, thereby making the lens have the characteristic of a compact structure. More specifically, ET8, ET5, ET6, and ET7 may further satisfy 0.9 < ET8 / (ET5 + ET6 + ET7) < 1.4.

[0058] In an exemplary embodiment, the optical imaging lens may satisfy 58 < V1 < 70, where V1 is the Abbe number of the first lens. The optical imaging lens satisfying 58 < V1 < 70 can make the optical imaging lens have less chromatic dispersion, thereby improving the imaging quality of the lens.

[0059] In an exemplary embodiment, 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.

[0060] In an exemplary embodiment, at least one of the first lens to the eighth lens may be a glass lens. The thermal expansion system of the glass material is low and it is less affected by the ambient temperature. Through the reasonable cooperation of the materials between the lenses, it can be ensured that the optical imaging lens maintains a high resolution ability within a large temperature change range. Exemplarily, the material of the first lens may be glass, and this setting method is beneficial to reducing the chromatic dispersion of the optical imaging lens.

[0061] The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the volume of the optical imaging lens can be effectively reduced, the sensitivity of the optical imaging lens can be reduced, and the processability of the optical imaging lens can be improved, making the optical imaging lens more conducive to production and processing and applicable to portable electronic products. The optical imaging lens according to the embodiment of the present application also has at least one beneficial effect such as high pixel, high imaging quality, compact structure, and miniaturization.

[0062] In an embodiment of the present application, at least one of the mirror surfaces of each lens is 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 eighth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature continuously changes 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, 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 as much as possible the aberration that appears during imaging, 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 to the eighth lens is an aspherical mirror surface. Optionally, both the object side surface and the image side surface of each of the first lens to the eighth lens are aspherical mirror surfaces.

[0063] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present 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 eight lenses are described as an example in the embodiment, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0064] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0065] Example 1

[0066] The following refers to Figures 1 to 2B Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 A schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0067] As Figure 1 shown, the optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1 is used to form the first lens group, and the first lens group has a positive optical power; the second lens E2 to the eighth lens E8 are used to form the second lens group, and the second lens group has a positive optical power.

[0068] The first lens E1 has a positive 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 convex, and its image side S4 is concave. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative optical power, its object side S9 is convex, and its image side S10 is concave. The sixth lens has a negative optical power, its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is convex. The eighth lens E8 has a negative optical power, its object side S15 is concave, and its image side S16 is concave. The filter E9 has an object side S17 and an image side S18. The optical imaging lens has an imaging surface S19, and the light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0069] Table 1 shows the basic parameter table of the optical imaging lens of Example 1, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0070]

[0071] Table 1

[0072] In Example 1, the total effective focal length f of the optical imaging lens is 6.40 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 is 8.40 mm, and half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 6.70 mm.

[0073] In Example 1, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0074]

[0075] where x is the sagitta, the distance from the vertex of the aspherical surface at the position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1 to S8 in Example 1.

[0076] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.2733E-04 4.6191E-04 -5.7662E-04 5.4305E-04 -2.9214E-04 9.5118E-05 -1.8530E-05 1.9955E-06 -9.3323E-08 S2 9.0407E-03 -3.9124E-03 2.0254E-04 1.1788E-03 -9.7671E-04 3.9819E-04 -9.0886E-05 1.1035E-05 -5.5522E-07 S3 -1.6758E-02 1.2408E-03 -3.6821E-03 4.0734E-03 -2.3956E-03 8.6942E-04 -1.9092E-04 2.3097E-05 -1.1698E-06 S4 -1.1180E-02 -2.7120E-03 3.5633E-03 -3.6504E-03 2.7630E-03 -1.2535E-03 3.3416E-04 -4.8767E-05 3.0318E-06 S5 -3.6757E-03 -7.2703E-03 1.0385E-03 1.3595E-04 -1.3468E-04 8.9976E-05 -3.8800E-05 7.6942E-06 -5.3517E-07 S6 8.1076E-03 -5.0882E-03 -1.1853E-03 2.0293E-03 -1.1500E-03 4.1786E-04 -1.0262E-04 1.4617E-05 -8.6106E-07 S7 -1.7606E-03 6.9029E-03 -5.9314E-03 3.9953E-03 -1.9144E-03 6.0662E-04 -1.2265E-04 1.4013E-05 -6.7136E-07 S8 -1.7452E-02 9.4089E-03 -9.4398E-03 6.9521E-03 -3.4213E-03 1.0631E-03 -1.9903E-04 2.0358E-05 -8.7436E-07 S9 -3.9011E-02 2.3970E-02 -2.0900E-02 1.3396E-02 -5.7282E-03 1.5737E-03 -2.7059E-04 2.6553E-05 -1.1269E-06 S10 -4.4055E-02 3.4447E-02 -2.6195E-02 1.3198E-02 -4.2390E-03 8.6155E-04 -1.0851E-04 7.7649E-06 -2.4040E-07 S11 -2.3851E-02 1.8080E-02 -8.9978E-03 1.3948E-03 4.2647E-04 -2.3359E-04 4.4041E-05 -3.9390E-06 1.3958E-07 S12 -6.7661E-02 3.8950E-02 -1.6756E-02 4.1647E-03 -5.6686E-04 2.8887E-05 2.2327E-06 -3.5569E-07 1.2809E-08 S13 -3.2308E-02 1.6668E-02 -6.5658E-03 1.5807E-03 -2.4984E-04 2.4273E-05 -1.3690E-06 4.2397E-08 -5.9852E-10 S14 2.2622E-02 -1.1120E-02 3.3854E-03 -7.2375E-04 1.0298E-04 -1.0075E-05 6.7423E-07 -2.7584E-08 5.0451E-10 S15 -4.4502E-02 4.2346E-03 2.2126E-04 -3.2748E-05 -1.6854E-06 3.8922E-07 -2.2306E-08 5.6828E-10 -5.5920E-12 S16 -2.5414E-02 4.3851E-03 -4.9753E-04 4.0262E-05 -2.3734E-06 9.8899E-08 -2.7145E-09 4.3308E-11 -3.0070E-13

[0077] Table 2

[0078] Figure 2A The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2B The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude values corresponding to different image heights. According to Figures 2A to 2B it can be known that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0079] Example 2

[0080] The following refers to Figures 3 to 4B Describe the optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those of Embodiment 1 will be omitted. Figure 3 The structural schematic diagram of the optical imaging lens according to Embodiment 2 of the present application is shown.

[0081] As Figure 3 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1 is used to form a first lens group, and the first lens group has a positive optical power; the second lens E2 to the eighth lens E8 are used to form a second lens group, and the second lens group has a positive optical power.

[0082] The first lens E1 has a positive optical power, its object side S1 is a convex surface, and its image side S2 is a concave surface. The second lens E2 has a positive optical power, its object side S3 is a convex surface, and its image side S4 is a concave surface. The third lens E3 has a negative optical power, its object side S5 is a convex surface, and its image side S6 is a concave surface. The fourth lens E4 has a positive optical power, its object side S7 is a convex surface, and its image side S8 is a convex surface. The fifth lens E5 has a negative optical power, its object side S9 is a concave surface, and its image side S10 is a concave surface. The sixth lens has a negative optical power, its object side S11 is a convex surface, and its image side S12 is a concave surface. The seventh lens E7 has a positive optical power, its object side S13 is a convex surface, and its image side S14 is a convex surface. The eighth lens E8 has a negative optical power, its object side S15 is a concave surface, and its image side S16 is a concave surface. The filter E9 has an object side S17 and an image side S18. The optical imaging lens has an imaging surface S19, and the light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0083] In Embodiment 2, the total effective focal length f of the optical imaging lens is 6.51 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S19 on the optical axis is 8.60 mm, and half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 6.70 mm.

[0084] Table 3 shows the basic parameter table of the optical imaging lens of Embodiment 2, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 4 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 2, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0085]

[0086] Table 3

[0087]

[0088]

[0089] Table 4

[0090] Figure 4A shows the astigmatism curve of the optical imaging lens of Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4B shows the distortion curve of the optical imaging lens of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. According to Figures 4A to 4B it can be seen that the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0091] Example 3

[0092] The following refers to Figures 5 to 6B to describe the optical imaging lens according to Embodiment 3 of the present application. Figure 5 shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application.

[0093] As Figure 5 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1 is used to form a first lens group, and the first lens group has a positive optical power; the second lens E2 to the eighth lens E8 are used to form a second lens group, and the second lens group has a positive optical power.

[0094] The first lens E1 has a positive 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 convex, and its image side S4 is concave. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative optical power, its object side S9 is convex, and its image side S10 is concave. The sixth lens has a negative optical power, its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is convex. The eighth lens E8 has a negative optical power, its object side S15 is concave, and its image side S16 is concave. The filter E9 has an object side S17 and an image side S18. The optical imaging lens has an imaging surface S19, and the light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0095] In Embodiment 3, the total effective focal length f of the optical imaging lens is 6.45 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 is 8.50 mm, and half of the diagonal length of the effective pixel region of the photosensitive element on the imaging surface S19 is ImgH = 6.70 mm.

[0096] Table 5 shows the basic parameter table of the optical imaging lens of Embodiment 3, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 6 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 3, and each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0097]

[0098]

[0099] Table 5

[0100] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.1149E-04 4.2641E-04 -5.6873E-04 5.5896E-04 -3.0083E-04 9.6326E-05 -1.8331E-05 1.9299E-06 -8.9001E-08 S2 9.3691E-03 -3.9756E-03 -2.6311E-04 1.6869E-03 -1.2426E-03 4.7715E-04 -1.0420E-04 1.2194E-05 -5.9404E-07 S3 -1.7241E-02 1.2600E-03 -3.6947E-03 4.0725E-03 -2.3664E-03 8.4579E-04 -1.8252E-04 2.1659E-05 -1.0737E-06 S4 -1.1178E-02 -3.1454E-03 4.5389E-03 -4.7530E-03 3.4871E-03 -1.5348E-03 3.9785E-04 -5.6466E-05 3.4099E-06 S5 -3.8368E-03 -6.3884E-03 -2.9157E-04 1.2977E-03 -7.3646E-04 2.7647E-04 -7.1691E-05 1.0644E-05 -6.3573E-07 S6 7.2795E-03 -2.9911E-03 -3.5572E-03 3.7653E-03 -1.9699E-03 6.5997E-04 -1.4480E-04 1.8506E-05 -1.0041E-06 S7 -2.0384E-03 8.2016E-03 -7.5826E-03 5.2519E-03 -2.5175E-03 7.8623E-04 -1.5440E-04 1.7048E-05 -7.9190E-07 S8 -1.8006E-02 1.0490E-02 -1.0434E-02 7.4699E-03 -3.5716E-03 1.0870E-03 -2.0060E-04 2.0304E-05 -8.6444E-07 S9 -4.0561E-02 2.7095E-02 -2.3569E-02 1.4816E-02 -6.2582E-03 1.7069E-03 -2.9067E-04 2.8083E-05 -1.1670E-06 S10 -4.5434E-02 3.5704E-02 -2.6358E-02 1.3054E-02 -4.1855E-03 8.5653E-04 -1.0881E-04 7.8311E-06 -2.4275E-07 S11 -2.0795E-02 1.4314E-02 -6.6776E-03 9.1717E-04 3.3625E-04 -1.6714E-04 3.0098E-05 -2.5910E-06 8.8593E-08 S12 -6.5561E-02 3.6632E-02 -1.5320E-02 3.7388E-03 -5.1339E-04 3.0829E-05 8.7838E-07 -2.1411E-07 7.9297E-09 S13 -3.2782E-02 1.7092E-02 -6.4930E-03 1.4916E-03 -2.2588E-04 2.1199E-05 -1.1613E-06 3.5175E-08 -4.9269E-10 S14 2.1223E-02 -1.0552E-02 3.4134E-03 -7.9166E-04 1.2168E-04 -1.2575E-05 8.5599E-07 -3.4440E-08 6.0924E-10 S15 -4.3553E-02 3.9453E-03 2.5188E-04 -3.6834E-05 -1.0113E-06 3.2485E-07 -1.9078E-08 4.8674E-10 -4.7671E-12 S16 -2.5285E-02 4.4328E-03 -5.2026E-04 4.4169E-05 -2.7138E-06 1.1535E-07 -3.1577E-09 4.9435E-11 -3.3365E-13

[0101] Table 6

[0102] Figure 6A shows the astigmatism curve of the optical imaging lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6B shows the distortion curve of the optical imaging lens of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. According to Figures 6A to 6B it can be seen that the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0103] Example 4

[0104] The following refers toFigures 7 to 8B Describe the optical imaging lens according to Embodiment 4 of the present application. Figure 7 The schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application is shown.

[0105] As Figure 7 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1 is used to form a first lens group, and the first lens group has a positive optical power; the second lens E2 to the eighth lens E8 are used to form a second lens group, and the second lens group has a positive optical power.

[0106] The first lens E1 has a positive optical power, its object side S1 is a convex surface, and its image side S2 is a concave surface. The second lens E2 has a positive optical power, its object side S3 is a convex surface, and its image side S4 is a concave surface. The third lens E3 has a negative optical power, its object side S5 is a convex surface, and its image side S6 is a concave surface. The fourth lens E4 has a positive optical power, its object side S7 is a convex surface, and its image side S8 is a convex surface. The fifth lens E5 has a negative optical power, its object side S9 is a convex surface, and its image side S10 is a concave surface. The sixth lens has a negative optical power, its object side S11 is a convex surface, and its image side S12 is a concave surface. The seventh lens E7 has a positive optical power, its object side S13 is a convex surface, and its image side S14 is a convex surface. The eighth lens E8 has a negative optical power, its object side S15 is a concave surface, and its image side S16 is a concave surface. The filter E9 has an object side S17 and an image side S18. The optical imaging lens has an imaging surface S19, and the light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0107] In Embodiment 4, the total effective focal length f of the optical imaging lens is 6.44 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 is 8.49 mm, and half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 6.70 mm.

[0108] Table 7 shows the basic parameter table of the optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 8 shows the high-order term coefficients of the aspherical mirrors that can be used in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0109]

[0110] Table 7

[0111]

[0112]

[0113] Table 8

[0114] Figure 8A 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 8B shows the distortion curve of the optical imaging lens of Embodiment 4, which represents the distortion magnitude values corresponding to different image heights. According to Figures 8A to 8B it can be known that the optical imaging lens given in Embodiment 4 can achieve good imaging quality.

[0115] Example 5

[0116] The following refers to Figures 9 to 10B to describe the optical imaging lens according to Embodiment 5 of the present application. Figure 9 shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application.

[0117] As Figure 9 shown, the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1 is used to form a first lens group, and the first lens group has a positive optical power; the second lens E2 to the eighth lens E8 are used to form a second lens group, and the second lens group has a positive optical power.

[0118] The first lens E1 has a positive optical power, its object side S1 is a convex surface, and its image side S2 is a concave surface. The second lens E2 has a positive optical power, its object side S3 is a convex surface, and its image side S4 is a concave surface. The third lens E3 has a negative optical power, its object side S5 is a convex surface, and its image side S6 is a concave surface. The fourth lens E4 has a positive optical power, its object side S7 is a convex surface, and its image side S8 is a convex surface. The fifth lens E5 has a negative optical power, its object side S9 is a convex surface, and its image side S10 is a concave surface. The sixth lens has a negative optical power, its object side S11 is a convex surface, and its image side S12 is a concave surface. The seventh lens E7 has a positive optical power, its object side S13 is a convex surface, and its image side S14 is a convex surface. The eighth lens E8 has a negative optical power, its object side S15 is a concave surface, and its image side S16 is a concave surface. The filter E9 has an object side S17 and an image side S18. The optical imaging lens has an imaging surface S19, and the light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0119] In Embodiment 5, the total effective focal length f of the optical imaging lens is 6.45 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 is 8.50 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH = 6.73 mm.

[0120] Table 9 shows the basic parameter table of the optical imaging lens of Embodiment 5, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 10 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 5, and each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0121]

[0122]

[0123] Table 9

[0124] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.1476E-04 4.1866E-04 -5.5459E-04 5.4444E-04 -2.9240E-04 9.3479E-05 -1.7778E-05 1.8729E-06 -8.6574E-08 S2 9.3730E-03 -3.9988E-03 -2.2801E-04 1.6568E-03 -1.2272E-03 4.7230E-04 -1.0329E-04 1.2101E-05 -5.8998E-07 S3 -1.7230E-02 1.2730E-03 -3.7396E-03 4.1196E-03 -2.3942E-03 8.5564E-04 -1.8459E-04 2.1896E-05 -1.0852E-06 S4 -1.1176E-02 -3.1025E-03 4.4474E-03 -4.6619E-03 3.4325E-03 -1.5144E-03 3.9316E-04 -5.5868E-05 3.3774E-06 S5 -3.8608E-03 -6.3008E-03 -3.9491E-04 1.3647E-03 -7.6291E-04 2.8293E-04 -7.2627E-05 1.0716E-05 -6.3797E-07 S6 7.2747E-03 -2.9833E-03 -3.5429E-03 3.7314E-03 -1.9437E-03 6.4963E-04 -1.4254E-04 1.8246E-05 -9.9171E-07 S7 -2.0568E-03 8.2112E-03 -7.5761E-03 5.2346E-03 -2.5046E-03 7.8154E-04 -1.5349E-04 1.6955E-05 -7.8809E-07 S8 -1.8045E-02 1.0557E-02 -1.0507E-02 7.5232E-03 -3.5975E-03 1.0951E-03 -2.0212E-04 2.0462E-05 -8.7127E-07 S9 -4.0536E-02 2.6956E-02 -2.3380E-02 1.4692E-02 -6.2129E-03 1.6972E-03 -2.8946E-04 2.8002E-05 -1.1647E-06 S10 -4.5240E-02 3.5305E-02 -2.5971E-02 1.2848E-02 -4.1207E-03 8.4410E-04 -1.0738E-04 7.7408E-06 -2.4033E-07 S11 -2.0777E-02 1.4317E-02 -6.7244E-03 9.6875E-04 3.1177E-04 -1.6094E-04 2.9221E-05 -2.5253E-06 8.6559E-08 S12 -6.5627E-02 3.6778E-02 -1.5468E-02 3.8147E-03 -5.3536E-04 3.4569E-05 5.0630E-07 -1.9406E-07 7.4776E-09 S13 -3.2988E-02 1.7367E-02 -6.6670E-03 1.5518E-03 -2.3813E-04 2.2700E-05 -1.2698E-06 3.9451E-08 -5.6339E-10 S14 2.1153E-02 -1.0462E-02 3.3658E-03 -7.7855E-04 1.1961E-04 -1.2383E-05 8.4585E-07 -3.4169E-08 6.0664E-10 S15 -4.3588E-02 3.9602E-03 2.4884E-04 -3.6427E-05 -1.0506E-06 3.2746E-07 -1.9187E-08 4.8924E-10 -4.7912E-12 S16 -2.5251E-02 4.4207E-03 -5.1778E-04 4.3877E-05 -2.6924E-06 1.1436E-07 -3.1286E-09 4.8957E-11 -3.3029E-13

[0125] Table 10

[0126] Figure 10A shows the astigmatism curve of the optical imaging lens of Embodiment 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10B shows the distortion curve of the optical imaging lens of Embodiment 5, which represents the distortion magnitude values corresponding to different image heights. According to Figures 10A to 10B it can be seen that the optical imaging lens given in Embodiment 5 can achieve good imaging quality.

[0127] In summary, Embodiments 1 to 5 respectively satisfy the relationships shown in Table 11.

[0128] Conditional / Example 1 2 3 4 5 ImgH×ImgH / TTL(mm) 5.34 5.22 5.28 5.29 5.33 FG2 / FG1 3.81 2.95 3.44 3.49 3.44 TTL / ImgH 1.25 1.28 1.27 1.27 1.26 f×tan(FOV / 2)(mm) 6.45 6.43 6.45 6.46 6.49 f1 / (R1+R2) 1.15 1.21 1.17 1.17 1.17 f3 / (f5+f6) 1.30 0.17 1.16 1.14 1.16 (R5+R6) / (R3+R4) 1.35 1.23 1.32 1.32 1.32 (f7-f8) / (R13+R16) 1.43 1.65 1.43 1.42 1.43 (CT7+CT8) / T78 1.54 1.48 1.58 1.56 1.58 f34 / f567 6.78 4.43 7.32 7.45 7.29 (SAG61+SAG62) / (SAG51+SAG52) 1.46 0.89 1.39 1.37 1.39 CT4 / (T45+ET4) 1.14 1.33 1.11 1.12 1.11 ET8 / (ET5+ET6+ET7) 1.10 1.35 1.09 1.02 1.09

[0129] Table 11

[0130] The present application also provides an imaging device, and its 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.

[0131] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of protection 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 technical features (but not limited to) disclosed in the present application that have similar functions.

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 group with positive optical power, including a first lens, where the object side surface of the first lens is convex and the image side surface is concave; A second lens group with positive optical power, which sequentially includes, along the optical axis from the first lens to the image side: a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, The second lens has positive optical power, its object side surface is convex, and its image side surface is concave; The third lens has negative optical power, its object side surface is convex, and its image side surface is concave; The fourth lens has positive optical power, its object side surface is convex, and its image side surface is convex; The fifth lens has negative optical power, and its image side surface is concave; The sixth lens has negative optical power, its object side surface is convex, and its image side surface is concave; The seventh lens has positive optical power, its object side surface is convex, and its image side surface is convex; The eighth lens has negative optical power, its object side surface is concave, and its image side surface is concave; The number of lenses with optical power in the optical imaging lens is eight; Half of the diagonal length ImgH of the effective pixel area of the photosensitive element on the imaging surface of the optical imaging lens and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy: 1.25 ≤ TTL / ImgH < 1.3; At least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the eighth lens is an aspherical surface.

2. The optical imaging lens according to claim 1, characterized in that, The effective focal length FG2 of the second lens group and the effective focal length FG1 of the first lens group satisfy: 2.95 ≤ FG2 / FG1 ≤ 3.

81.

3. The optical imaging lens according to claim 1, wherein The total effective focal length f of the optical imaging lens and the maximum field of view FOV of the optical imaging lens satisfy: 6.43 mm ≤ f×tan(FOV / 2) ≤ 6.49 mm.

4. The optical imaging lens according to claim 1, characterized in that, The effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 1.15 ≤ f1 / (R1 + R2) ≤ 1.

21.

5. The optical imaging lens according to claim 1, wherein The effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 0.17 ≤ f3 / (f5 + f6) ≤ 1.

30.

6. The optical imaging lens according to claim 1, wherein, The curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 1.23 ≤ (R5 + R6) / (R3 + R4) ≤ 1.

35.

7. The optical imaging lens according to claim 1, wherein The effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, the curvature radius R13 of the object side surface of the seventh lens, and the curvature radius R16 of the image side surface of the eighth lens satisfy: 1.42 ≤ (f7 - f8) / (R13 + R16) ≤ 1.

65.

8. The optical imaging lens according to claim 1, characterized in that, The central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the interval distance T78 between the seventh lens and the eighth lens on the optical axis satisfy: 1.48 ≤ (CT7 + CT8) / T78 ≤ 1.58。 9. The optical imaging lens according to claim 1, characterized in that, The combined focal length f34 of the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens, and the seventh lens satisfy: 4.43 ≤ f34 / f567 ≤ 7.45。 10. The optical imaging lens according to claim 1, characterized in that, The distance SAG61 on the optical axis 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, the distance SAG62 on the optical axis 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, the distance SAG51 on the optical axis 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 distance SAG52 on the optical axis 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 satisfy: 0.89 ≤ (SAG61 + SAG62) / (SAG51 + SAG52) < 1.5。 11. The optical imaging lens according to claim 1, characterized in that, The central thickness CT4 of the fourth lens on the optical axis, the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, and the edge thickness ET4 of the fourth lens satisfy: 1.1 < CT4 / (T45 + ET4) ≤ 1.33。 12. The optical imaging lens according to claim 1, characterized in that, The edge thickness ET8 of the eighth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens satisfy: 1.02 ≤ ET8 / (ET5 + ET6 + ET7) ≤ 1.35。 13. The optical imaging lens according to any one of claims 1 to 12, characterized in that, The first lens is formed of glass.

14. The optical imaging lens according to claim 13, characterized in that, The Abbe number of the first lens satisfies: 59.5≤V1≤67.1。 15. The optical imaging lens according to claim 13, wherein The object side surface and the image side surface of the first lens are aspherical surfaces.

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