Optical imaging lens

Abstract

The present application discloses an optical imaging lens, comprising, in order from the object side to the image side along the optical axis: a first lens having positive optical power, whose object-side surface is convex and whose image-side surface is concave; a second lens having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power, whose object-side surface is convex and whose image-side surface is concave; and an eighth lens having optical power, which is a composite lens including a lens portion and a substrate portion and whose image-side surface is flat. The center thickness CT8 of the eighth lens on the optical axis, the edge thickness ET8 of the eighth lens, and the distance BFL from the image-side surface of the eighth lens to the imaging plane of the optical imaging lens on the optical axis satisfy the following conditions: 0<|CT8‑ET8| / BFL<4.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical imaging lens. Background Art

[0002] With the rapid evolution of smart electronic devices such as mobile phones, computers, and tablets, market demands for the cameras used in these devices are becoming increasingly demanding. Mobile phone manufacturers are also continuously increasing the size of their "bottom" (the "bottom"), which refers to the size of the imaging medium. Previously, this was film, but now, in the digital age, it's been replaced by a photosensitive chip, though the abbreviation "bottom" has persisted. Larger sensors produce cleaner images, better low-light performance, and enhanced bokeh. Therefore, large sensors offer a significant advantage in imaging results. However, the use of large sensors also presents certain challenges. For example, to accommodate larger sensors, the size of the camera and lens increases exponentially. Furthermore, the complex optical design required to ensure uniform light distribution across the sensor increases the weight of the lens exponentially. Therefore, designing and developing an optical imaging lens that combines a large bottom and illumination, ensuring excellent image quality, with a compact size and weight for optimal suitability in thin and lightweight portable electronic devices has become a pressing challenge for those skilled in the art. Summary of the Invention

[0003] The present application provides an optical imaging lens, which may include, in order from the object side to the image side along the optical axis: a first lens having positive optical power, whose object-side surface is convex and whose image-side surface is concave; a second lens having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having optical power, whose object-side surface is convex and whose image-side surface is concave; and an eighth lens having optical power, which is a composite lens including a lens portion and a substrate portion and whose image-side surface is a plane. The center thickness CT8 of the eighth lens on the optical axis, the edge thickness ET8 of the eighth lens, and the distance BFL from the image-side surface of the eighth lens to the imaging plane of the optical imaging lens on the optical axis may satisfy the following: 0<|CT8-ET8| / BFL<4.

[0004] In one embodiment, the distance TTL from the object side of the first lens to the imaging plane along the optical axis, the maximum half field of view Semi-FOV of the optical imaging lens, and half the diagonal length of the effective pixel area on the imaging plane ImgH may satisfy: 1.4 <TTL / (TAN(Semi-FOV)×ImgH)<1.7。

[0005] In one embodiment, half the diagonal length ImgH of the effective pixel area on the imaging plane, the aperture value fno of the optical imaging lens, and the effective focal length f of the optical imaging lens may satisfy the following: 1.5≤ImgH×fno / f<1.8.

[0006] In one embodiment, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens may satisfy the following conditions: 0.4 <f / |f1+f2|<1.7。

[0007] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: -5<(f3 / f4)+(f5 / f6)<-1.

[0008] In one embodiment, a sum ΣET of edge thicknesses of each lens among the first to eighth lenses and a sum ΣCT of center thicknesses of each lens among the first to eighth lenses on the optical axis may satisfy the following: 0.7<ΣET / ΣCT<1.

[0009] In one embodiment, the edge thickness ET7 of the seventh lens, the edge thickness ET8 of the eighth lens, and the sum ΣET of the edge thicknesses of each lens from the first to the eighth lenses may satisfy: 0.3<(ET7+ET8) / ΣET<0.5.

[0010] In one embodiment, the effective focal length f2 of the second 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 may satisfy: <f2 / |R3-R4|<-4。

[0011] In one embodiment, the curvature radius R15 of the object side surface of the eighth lens and the effective focal length f8 of the eighth lens may satisfy: 0.3 <R15 / f8<0.6。

[0012] In one embodiment, a distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens on the optical axis, a center thickness CT8 of the eighth lens on the optical axis, and a distance TTL from the object side surface of the first lens to the imaging plane along the optical axis may satisfy the following: 0.1<(T78+CT8) / TTL<0.4.

[0013] In one embodiment, the distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens on the optical axis and the distance Tr1r14 from the object side surface of the first lens to the image side surface of the seventh lens along the optical axis may satisfy: <T78 / Tr1r14<0.5。

[0014] In one embodiment, a distance T67 on the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens, a distance T78 on the optical axis from the image side surface of the seventh lens to the object side surface of the eighth lens, and a sum ∑AT of the air intervals on the optical axis between any two adjacent lenses from the first to the eighth lenses may satisfy the following: 0.5≤(T67+T78) / ∑AT<0.7.

[0015] In one embodiment, the effective radius DT81 of the object-side surface of the eighth lens, the effective radius DT41 of the object-side surface of the fourth lens, and the effective radius DT11 of the object-side surface of the first lens may satisfy: 0.9≤(DT81-DT41) / (DT81-DT11)<1.1.

[0016] In one embodiment, the effective radius DT81 of the object side surface of the eighth lens and the effective radius DT11 of the object side surface of the first lens may satisfy: 2.5 <DT81 / DT11<3.5。

[0017] In one embodiment, the effective radius DT81 of the object side of the eighth lens, the maximum half field angle Semi-FOV of the optical imaging lens, and half the diagonal length of the effective pixel area on the imaging surface ImgH may satisfy: 1 <DT81 / (TAN(Semi-FOV)×ImgH)<1.1。

[0018] In one embodiment, the substrate portion is an infrared cutoff filter.

[0019] In one embodiment, an infrared cutoff layer is provided on the image-side surface of the eighth lens.

[0020] In one embodiment, the substrate is made of flat glass.

[0021] In one embodiment, the lens portion has an aspherical surface, and the lens portion is formed of a force-deformable material.

[0022] In one embodiment, the eighth lens is a composite lens having the lens portion and the substrate portion, which is formed by attaching the stress-deformable material to the flat glass and then embossing the stress-deformable material.

[0023] The present application adopts an eight-piece lens architecture. According to the implementation methods of the present application, by setting the eighth lens as a composite lens with one side being a flat surface, and by reasonably controlling the relationship between the center thickness, edge thickness, and the on-axis distance between the image side surface of the eighth lens and the imaging surface of the lens, the problems of decentering and large tilt caused by the molding problems of the eighth lens caused by the use of a metal mold and an embossing process can be reduced. The imaging quality can be guaranteed while shortening the lens height, thereby achieving better shooting effects.

[0024] In addition, according to some embodiments of the present application, by reasonably setting and matching parameters such as the optical focal length, surface shape, curvature radius, effective radius, center thickness, edge thickness and air gap between each lens, and by reasonably controlling parameters such as half of the diagonal length of the effective pixel area on the imaging surface, the distance from the object side of the first lens to the imaging surface along the optical axis, and the maximum half field of view angle of the lens, the system can be made thinner, the image surface larger, and the field of view larger, ensuring that the system can present more detailed information of the photographed scene and achieve characteristics such as high resolution, large depth of field and large aperture of the lens; while ensuring a large base and illumination, the lens volume is reduced to achieve a lightweight product; and better shooting effects and better resolution can be achieved, while also ensuring the stability of the lens process and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0026] Figure 1 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application;

[0027] Figures 2A to 2D axial chromatic aberration curve, magnification chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 1 are respectively shown;

[0028] Figure 3 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application;

[0029] Figures 4A to 4D axial chromatic aberration curve, lateral chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 2 are respectively shown;

[0030] Figure 5 1 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application;

[0031] 6A to 6D axial chromatic aberration curve, magnification chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 3 are respectively shown;

[0032] Figure 7 shows a schematic structural diagram of an optical imaging lens according to Example 4 of the present application; and

[0033] Figures 8A to 8D The axial chromatic aberration curve, magnification chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 4 are respectively shown. DETAILED DESCRIPTION

[0034] For a better understanding of 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 merely descriptions of exemplary embodiments of the present application and are not intended to 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.

[0035] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0036] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0037] In this document, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0038] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," 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 expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can 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.

[0041] The features, principles and other aspects of the present application are described in detail below.

[0042] An optical imaging lens according to an exemplary embodiment of the present application may include, for example, eight lenses, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. These eight lenses are arranged in order from the object side to the image side along the optical axis.

[0043] In an exemplary embodiment, the first lens may have positive optical power; the second lens may have negative optical power; the third lens may have positive optical power or negative optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have positive optical power or negative optical power; the sixth lens may have positive optical power or negative optical power; the seventh lens may have positive optical power or negative optical power; and the eighth lens may have positive optical power or negative optical power.

[0044] In an exemplary embodiment, the object-side surface of the first lens may be convex, and the image-side surface may be concave; the object-side surface of the second lens may be convex, and the image-side surface may be concave; the object-side surface of the seventh lens may be convex, and the image-side surface may be concave.

[0045] In exemplary embodiments, the eighth lens may be a composite lens having a flat surface on one side. Specifically, the eighth lens may be a composite lens including a lens portion and a substrate portion, and having a flat surface on its image side.

[0046] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0 < |CT8 - ET8| / BFL < 4, where CT8 is the central thickness of the eighth lens on the optical axis, ET8 is the edge thickness of the eighth lens, and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface of the optical imaging lens. By controlling the ratio of the absolute value of the difference between the central thickness and the edge thickness of the eighth lens on the optical axis to the distance on the optical axis from the image side of the eighth lens to the imaging surface of the optical imaging lens within this range, problems such as large eccentricity and tilt caused by molding problems of the eighth lens can be reduced, the imaging quality can be ensured while shortening the lens height, and a better shooting effect can be achieved. More specifically, CT8, ET8, and BFL can satisfy: 0.3 < |CT8 - ET8| / BFL < 3.9.

[0047] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.4 < TTL / (TAN(Semi - FOV) × ImgH) < 1.7, where TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, Semi - FOV is the maximum half - field angle of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface. The optical imaging lens of the present application adopts an eight - lens structure. When including, for example, telephoto shooting, by controlling the distance along the optical axis from the object side of the first lens to the imaging surface, the maximum half - field angle of the optical imaging lens, and half of the diagonal length of the effective pixel area on the imaging surface to satisfy 1.4 < TTL / (TAN(Semi - FOV) × ImgH) < 1.7, the system can be made thinner, the image surface can be larger, the field angle can be larger, more detailed information of the photographed scene can be presented by the system, and high resolution, large depth of field, and large aperture can be achieved.

[0048] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.5 ≤ ImgH × fno / f < 1.8, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface, fno is the aperture value of the optical imaging lens, and f is the effective focal length of the optical imaging lens. By controlling half of the diagonal length of the effective pixel area on the imaging surface, the aperture value of the optical imaging lens, and the effective focal length of the optical imaging lens to satisfy 1.5 ≤ ImgH × fno / f < 1.8, not only can a larger image surface of the system be ensured, but also sufficient light flux can be guaranteed, avoiding problems such as poor imaging quality caused by too large fno, too weak light energy acquisition, and too low MTF diffraction limit of the system, and the control of the effective focal length is also beneficial to better balancing the aberration of the entire system, ensuring that a clear and complete image can be presented on the photosensitive element, and achieving a better shooting effect.

[0049] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.4 < f / |f1 + f2| < 1.7, where f is the effective focal length of the optical imaging lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. By controlling the ratio of the effective focal length of the optical imaging lens to the absolute value of the sum of the effective focal lengths of the first lens and the second lens within this range, the sensitivity of these two lenses can be reduced, avoiding overly strict tolerance requirements, and the astigmatism, spherical aberration, chromatic aberration of magnification, etc. brought by the first and second lenses can be better complementarily eliminated through cross distribution and cooperation with the entire system, thereby improving the imaging quality of the entire system and obtaining better resolution.

[0050] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula -5 < (f3 / f4) + (f5 / f6) < -1, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. By controlling the effective focal lengths of the third lens, the fourth lens, the fifth lens, and the sixth lens to satisfy -5 < (f3 / f4) + (f5 / f6) < -1, on the one hand, the aberration of the entire system can be better balanced, improving the imaging quality of the system, and on the other hand, the light path can be reasonably controlled to avoid the problem of excessive lens sensitivity caused by the overly steep light distribution of the third to sixth lenses due to the relatively large image plane of the system. More specifically, f3, f4, f5, and f6 can satisfy: -4.7 < (f3 / f4) + (f5 / f6) < -1.5.

[0051] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.7 < ∑ET / ∑CT < 1, where ∑ET is the sum of the edge thicknesses of each lens from the first lens to the eighth lens, and ∑CT is the sum of the central thicknesses of each lens from the first lens to the eighth lens on the optical axis. By controlling the ratio of the sum of the edge thicknesses of each lens from the first lens to the eighth lens to the sum of the central thicknesses of each lens from the first lens to the eighth lens on the optical axis within this range, not only can the processability of each lens be ensured, but also better diopter can be obtained, thereby improving the imaging quality of the entire system and obtaining better resolution. More specifically, ∑ET and ∑CT can satisfy: 0.75 < ∑ET / ∑CT < 0.98.

[0052] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.3 < (ET7 + ET8) / ∑ET < 0.5, where ET7 is the edge thickness of the seventh lens, ET8 is the edge thickness of the eighth lens, and ∑ET is the sum of the edge thicknesses of each lens from the first lens to the eighth lens. By controlling the ratio of the sum of the edge thicknesses of the seventh lens and the eighth lens to the sum of the edge thicknesses of each lens from the first lens to the eighth lens within this range, on the one hand, the distortion and field curvature of the entire system can be better balanced, and on the other hand, it can be ensured that each lens is not easily deformed during the assembly process, which is very helpful for the stability of the field curvature. In addition, the molding debugging process space is larger, avoiding the risk of stray light caused by appearance problems of the lens. More specifically, ET7, ET8, and ∑ET can satisfy: 0.31 ≤ (ET7 + ET8) / ∑ET < 0.45.

[0053] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula -8 < f2 / |R3 - R4| < -4, where f2 is the effective focal length of the second 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. By controlling the ratio of the effective focal length of the second lens to the absolute value of the difference between the curvature radius of the object side of the second lens and the curvature radius of the image side of the second lens within this range, the size of the front end of the system can be effectively reduced, which is beneficial to the miniaturization of the lens. In addition, it helps with the secondary reflection ghost image between the second lens and the third lens, avoiding the strong ghost image from affecting the actual imaging quality. More specifically, f2, R3, and R4 can satisfy: -7.6 < f < / |R3 - R4| < -4.1.

[0054] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.3 < R15 / f8 < 0.6, where R15 is the curvature radius of the object side of the eighth lens, and f8 is the effective focal length of the eighth lens. By controlling the ratio of the curvature radius of the object side of the eighth lens to the effective focal length of the eighth lens within this range, the process stability can be ensured while ensuring that the eighth lens provides sufficient focal length. More specifically, R15 and f8 can satisfy: 0.32 < R15 / f8 < 0.56.

[0055] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.1 < (T78 + CT8) / TTL < 0.4, where T78 is the distance on the optical axis from the image side of the seventh lens to the object side of the eighth lens, CT8 is the central thickness of the eighth lens on the optical axis, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface. By controlling the ratio of the sum of the distance on the optical axis from the image side of the seventh lens to the object side of the eighth lens and the central thickness of the eighth lens on the optical axis to the distance on the optical axis from the object side of the first lens to the imaging surface within this range, it can be ensured that the ratio of the total lens length to the back focal length is within a reasonable range, guaranteeing no interference during the focusing process and simultaneously ensuring miniaturization of the lens. More specifically, T78, CT8, and TTL can satisfy: 0.12 < (T78 + CT8) / TTL < 0.37.

[0056] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0 < T78 / Tr1r14 < 0.5, where T78 is the distance on the optical axis from the image side of the seventh lens to the object side of the eighth lens, and Tr1r14 is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens. By controlling the ratio of the distance on the optical axis from the image side of the seventh lens to the object side of the eighth lens to the distance on the optical axis from the object side of the first lens to the image side of the seventh lens within this range, the interference phenomenon during system focusing can be effectively avoided, thereby obtaining a more reasonable back focal value, preventing defects at the module end caused by an overly large or small back focal length, and simultaneously ensuring that the difference between the last lens and the first seven lenses is not too large, avoiding problems such as stray light and poor molding. More specifically, T78 and Tr1r14 can satisfy: 0.05 < T78 / Tr1r14 < 0.47.

[0057] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional equation 0.5 ≤ (T67 + T78) / ∑AT < 0.7, where T67 is the distance on the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens, T78 is the distance on the optical axis from the image side surface of the seventh lens to the object side surface of the eighth lens, and ∑AT is the sum of the air spacings on the optical axis between any two adjacent lenses from the first to the eighth lenses. By controlling the ratio of the sum of the distances on the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens and the distances on the optical axis from the image side surface of the seventh lens to the object side surface of the eighth lens to the sum of the air spacings on the optical axis between any two adjacent lenses from the first to the eighth lenses within a certain range, processing and assembly characteristics can be guaranteed, avoiding problems such as interference between front and rear lenses during assembly caused by too small a gap, or difficulty in molding lenses due to excessively thin lenses, which can easily cause deformation during assembly. Furthermore, properly adjusting the air spacing between lenses can better balance system distortion and field curvature, reduce ghost image energy, and ensure excellent imaging quality. More specifically, T67, T78, and ΣAT may satisfy 0.5≤(T67+T78) / ΣAT<0.67.

[0058] In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional equation 0.9 ≤ (DT81 - DT41) / (DT81 - DT11) < 1.1, where DT81 is the effective radius of the object side surface of the eighth lens element, DT41 is the effective radius of the object side surface of the fourth lens element, and DT11 is the effective radius of the object side surface of the first lens element. By controlling the ratio of the difference between the effective radius of the object side surface of the eighth lens element and the effective radius of the object side surface of the fourth lens element, and the difference between the effective radius of the object side surface of the eighth lens element and the effective radius of the object side surface of the first lens element, the vignetting value of the system can be effectively controlled, intercepting light rays with poor imaging quality, thereby improving the resolution of the entire system. Furthermore, the problem of large step difference caused by excessive effective radius differences can be avoided, ensuring assembly stability. More specifically, DT81, DT41, and DT11 can satisfy the following equation: 0.9 ≤ (DT81 - DT41) / (DT81 - DT11) < 1.06.

[0059] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 2.5 < DT81 / DT11 < 3.5, where DT81 is the effective radius of the object side surface of the eighth lens, and DT11 is the effective radius of the object side surface of the first lens. By controlling the ratio of the effective radius of the object side surface of the eighth lens to the effective radius of the object side surface of the first lens within this range, on the one hand, it is possible to avoid the problem of large step differences caused by too large radius differences between the first and eighth lenses, ensuring the stability of assembly; on the other hand, the larger effective radius of the object side surface of the first lens can ensure that the system has sufficient light flux and maintain the large aperture characteristics of the system, and the smaller effective radius of the object side surface of the eighth lens can prevent phenomena such as severe eccentricity and tilt of the compound lens, ensuring imaging quality. More specifically, DT81 and DT11 can satisfy: 2.7 < DT81 / DT11 < 3.4.

[0060] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1 < DT81 / (TAN(Semi-FOV)×ImgH) < 1.1, where DT81 is the effective radius of the object side surface of the eighth lens, Semi-FOV is the maximum semi-field angle of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface. By controlling the effective radius of the object side surface of the eighth lens, the maximum semi-field angle of the optical imaging lens, and half of the diagonal length of the effective pixel region on the imaging surface to satisfy 1 < DT81 / (TAN(Semi-FOV)×ImgH) < 1.1, it can be ensured that, on the premise of the same field angle and the incident angle of the chief ray, the distance between the compound lens and the image plane is relatively close. Through this structure, while ensuring large bottom and illuminance, the volume of the lens can be reduced, realizing the thinning and lightening of the product.

[0061] In an exemplary embodiment, the eighth lens may include a material that enables it to have the functions of an infrared cut-off filter. In other words, the eighth lens can have the functions of an infrared cut-off filter due to the material of the lens. Exemplarily, the substrate portion of the eighth lens can be an infrared cut-off filter. Exemplarily, the eighth lens can be a compound lens glued with materials such as glue and an infrared filter, and it still has infrared filtering functions. Its transmittance is 50% (half) at any wavelength within the wavelength range from 380 nm to 430 nm, and its transmittance is more than 80% within the wavelength range from 500 nm to 600 nm, and its transmittance is less than 10% within the wavelength range from 730 nm to 800 nm. It can send visible light to the ISP (Image Signal Processing) for post-image processing. If an infrared filter is not added, then infrared light will also participate in the calculation of the ISP, affecting the calculation results. <

[0062] In an exemplary embodiment, the image-side surface of the eighth lens element may be provided with an infrared cutoff layer, which functions as an infrared cutoff filter. Generally speaking, mobile phone lenses need to filter out infrared light beyond 700nm to achieve better imaging quality. The infrared cutoff layer provided on the image-side surface of the eighth lens element functions as an infrared cutoff filter, ensuring that only visible light is captured, thus preventing color shift in the image.

[0063] In an exemplary embodiment, the eighth lens element may be a composite lens composed of an aspherical lens portion and a glass substrate portion. For example, the substrate portion of the eighth lens element may be flat glass. While adding a surface degree of freedom to achieve high-performance correction of aberrations and imaging performance, the composite lens does not increase the overall number of lens elements, reducing lens size and achieving a thinner and lighter product.

[0064] In an exemplary embodiment, the eighth lens may be a composite lens composed of a lens portion having an aspherical surface and a glass substrate portion. The aspherical lens portion may be formed of a material that is deformable under load, specifically plastic, glue, etc. For cost, ease of processing, and process stability considerations, glue is typically used for the aspherical portion of the composite lens combined with the infrared filter. This glue reduces the shrinkage pressure during the manufacturing process, preventing the shrinkage pressure from causing the color filter to break.

[0065] In an exemplary embodiment, the eighth lens can be designed by attaching an aspherical lens portion to a glass substrate and then embossing the resulting shape. In other words, the eighth lens can be a composite lens comprising a lens portion and a substrate portion, formed by attaching a force-deformable material to flat glass and then embossing the material. For example, after selecting a material such as glue, and considering factors such as cost, ease of processing, and process stability, a nanoimprint process using an IR (Infrared Radiation) sheet as the substrate may be a relatively preferred solution. This provides more stable molding, cutting, and assembly, and parameters such as decentering, tilt, and sagittal height are easier to maintain, potentially improving subsequent mass production yields.

[0066] In exemplary embodiments, the optical imaging lens of the present application may include at least one aperture. The aperture can constrain the optical path and control the intensity of the light. The aperture can be positioned appropriately within the optical imaging lens, for example, between the object side and the first lens element.

[0067] In an exemplary embodiment, optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0068] In an exemplary embodiment, the effective focal length f of the optical imaging lens may be, for example, in the range of 5.4 mm to 6.0 mm, the effective focal length f1 of the first lens may be, for example, in the range of 4.8 mm to 6.0 mm, the effective focal length f2 of the second lens may be, for example, in the range of -19.1 mm to -8.3 mm, the effective focal length f3 of the third lens may be, for example, in the range of -41.1 mm to 23.3 mm, the effective focal length f4 of the fourth lens may be, for example, in the range of -13.5 mm to 23.4 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of -8.5 mm to 9.3 mm, the effective focal length f6 of the sixth lens may be, for example, in the range of -34.7 mm to 6.6 mm, the effective focal length f7 of the seventh lens may be, for example, in the range of -7.8 mm to 60.2 mm, and the effective focal length f8 of the eighth lens may be, for example, in the range of -12.3 mm to 204.4 mm.

[0069] The optical imaging lens according to the above-described embodiment of the present application can utilize multiple lenses, such as the eight lenses described above. By configuring the eighth lens as a composite lens with one flat side, the lens volume can be reduced while maintaining a large base and high illumination, achieving a lightweight and thin product. By rationally controlling the relationship between the center thickness and edge thickness of the eighth lens and the on-axis distance between the image side surface of the eighth lens and the lens imaging plane, problems such as decentering and significant tilt caused by molding the eighth lens using a metal mold and embossing process can be reduced. This allows for a shorter lens height while maintaining image quality, resulting in better shooting effects.

[0070] According to some embodiments of the present application, by reasonably setting and matching parameters such as the optical focal length, surface shape, curvature radius, effective radius, center thickness, edge thickness, and air spacing between each lens, and by reasonably controlling parameters such as half of the diagonal length of the effective pixel area on the imaging plane, the distance from the object side of the first lens to the imaging plane along the optical axis, and the maximum half field of view angle of the lens, the system can be made thinner, the image plane can be larger, and the field of view angle can be larger, ensuring that the system can present more detailed information of the photographed scene and realize characteristics such as high resolution, large depth of field, and large aperture of the lens; and better shooting effects can be achieved, better resolution can be obtained, and at the same time, the lens process and assembly stability can be guaranteed.

[0071] In an embodiment of the present application, at least one aspherical mirror surface may be included in the mirror surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, that is, at least one aspherical mirror surface may be included from the object side surface of the first lens to the image side surface of the eighth lens. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical mirror surface, and the object side surface of the eighth lens is an aspherical mirror surface. Optionally, the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, and the object-side surface of the eighth lens are aspherical mirror surfaces.

[0072] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while eight lenses are described in the embodiments, the optical imaging lens is not limited to eight lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0073] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0074] Example 1

[0075] The following reference Figures 1 to 2D The optical imaging lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens according to Example 1 of the present application is shown.

[0076] like Figure 1 As shown, the optical imaging lens includes, from the object side to the image side along the optical axis, an aperture 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 and an eighth lens E8.

[0077] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens element E8 is a composite lens formed by a lens portion and a base portion. The lens portion has negative optical power, with a concave object-side surface S15 and a flat image-side surface S16. Both the object-side surface S16 and the image-side surface S17 of the base portion are flat. The optical imaging lens has an imaging surface S18. Light from an object sequentially passes through surfaces S1 to S17 and is ultimately imaged on imaging surface S18.

[0078] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of curvature radius, thickness / distance, and effective radius are all millimeters (mm).

[0079]

[0080]

[0081] Table 1

[0082] In Example 1, the object-side surface and the image-side surface of any lens from the first lens E1 to the seventh lens E7, as well as the object-side surface of the eighth lens, are all aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0083]

[0084] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A80, A81, A9, A10, A11, A12, A13, A14, A15 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A28 and A 30 .

[0085] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.0961E-02 9.6345E-04 -1.1928E-03 -5.4125E-04 -3.0994E-04 -4.9751E-05 -4.3170E-05 S2 -2.4391E-02 1.3073E-02 -3.7812E-03 9.4853E-04 -1.8564E-04 -4.6743E-06 -2.4957E-05 S3 -2.5127E-02 2.6280E-02 -1.2896E-03 2.2022E-03 4.1237E-05 7.9055E-05 -1.9275E-05 S4 -9.1565E-03 8.3949E-03 5.0763E-05 1.0006E-03 2.6336E-04 1.3498E-04 5.0001E-05 S5 -2.3161E-01 -5.1821E-03 2.2780E-03 1.2723E-03 2.6617E-04 4.8816E-05 -1.3759E-05 S6 -2.4450E-01 2.5871E-02 8.7419E-03 2.9680E-03 1.3934E-03 9.9537E-05 -2.5728E-04 S7 -1.3294E-01 6.4386E-03 -2.2793E-03 2.6960E-03 3.2774E-03 9.8158E-04 -1.0776E-04 S8 -2.0633E-01 -2.2678E-02 -5.1379E-03 2.2298E-03 3.2032E-03 2.0695E-03 9.5145E-04 S9 -2.8123E-01 -3.7744E-02 -1.7071E-03 6.6142E-03 -2.6241E-03 3.9454E-04 3.0093E-04 S10 -1.0477E+00 3.1135E-01 -5.9099E-02 2.6504E-02 -2.3716E-02 7.2017E-03 -1.8585E-04 S11 -1.3455E+00 1.8893E-02 8.2436E-02 3.1628E-02 -1.6226E-02 -2.5185E-03 -3.4667E-03 S12 -8.6121E-01 -2.1536E-01 1.4801E-01 -5.5979E-02 6.3550E-03 1.0774E-04 4.1121E-03 S13 -1.7968E+00 6.1269E-01 -1.5097E-01 -1.3777E-03 1.5494E-02 3.5255E-03 -1.0847E-02 S14 -4.9254E+00 1.0366E+00 -2.7023E-01 9.4912E-02 -3.8439E-02 1.6848E-02 -1.0599E-02 S15 7.2558E-01 -2.7883E-02 -8.9938E-02 8.6362E-02 -5.2276E-02 2.7482E-02 -1.3494E-02

[0086] Table 2-1

[0087]

[0088]

[0089] Table 2-2

[0090] Figure 2A The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 2B The chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2C The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 2D The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion value corresponding to different image heights. Figures 2A to 2D It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0091] Example 2

[0092] The following reference Figures 3 to 4D The optical imaging lens according to Example 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0093] like Figure 3 As shown, the optical imaging lens includes, from the object side to the image side along the optical axis, an aperture 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 and an eighth lens E8.

[0094] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens element E8 is a composite lens formed by a lens portion and a base portion. The lens portion has positive refractive power, with a convex object-side surface S15 and a flat image-side surface S16. Both the object-side surface S16 and the image-side surface S17 of the base portion are flat. The optical imaging lens has an imaging surface S18. Light from an object sequentially passes through surfaces S1 to S17 and is ultimately imaged on imaging surface S18.

[0095] Table 3 shows the basic parameters of the optical imaging lens of Example 2, where the units of curvature radius, thickness / distance and effective radius are all millimeters (mm). Tables 4-1 and 4-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0096]

[0097]

[0098] Table 3

[0099] Face number A4 A6 A8 A10 A12 A14 A16 S1 -8.9069E-03 -5.9917E-03 -2.5922E-03 -8.7066E-04 -2.0186E-04 -4.7937E-05 1.9928E-07 S2 -7.3726E-02 1.2748E-02 -4.6453E-03 1.0092E-03 -1.8955E-04 -1.1085E-04 9.0968E-06 S3 -4.7215E-02 3.2565E-02 -2.3465E-03 2.4521E-03 -1.0886E-04 5.1205E-05 -2.0323E-05 S4 1.7223E-03 1.4024E-02 2.1136E-04 1.4946E-03 4.6731E-04 2.7205E-04 1.2134E-04 S5 -2.1848E-01 -1.0396E-02 6.3233E-04 1.5817E-03 6.2946E-04 2.3848E-04 8.9671E-05 S6 -2.8115E-01 1.0544E-02 1.0537E-02 2.9901E-03 8.4157E-04 -2.3137E-05 -3.3170E-05 S7 -8.7996E-02 2.4516E-02 5.2007E-03 -5.4905E-04 1.0660E-03 -7.9065E-05 -8.4524E-05 S8 -2.4941E-01 1.3414E-02 3.1321E-03 1.7088E-03 2.9483E-03 1.5775E-03 2.9563E-04 S9 -6.8868E-01 -3.1928E-02 -5.9566E-03 1.2280E-02 2.1382E-03 5.0859E-03 5.9917E-05 S10 -1.9726E+00 3.8633E-01 -7.3314E-02 3.2180E-02 -1.9309E-02 8.7267E-03 -2.8895E-03 S11 -2.8639E+00 2.6223E-01 3.8671E-02 2.5243E-02 -1.8990E-02 4.7278E-03 1.0087E-05 S12 -8.5554E-01 -2.3439E-01 1.6747E-01 -6.8378E-02 2.7066E-02 -8.0139E-03 3.3644E-03 S13 -2.4375E+00 1.0966E+00 -4.6767E-01 1.8880E-01 -6.2548E-02 1.0837E-02 8.2072E-04 S14 -6.2197E+00 1.4190E+00 -4.1660E-01 1.7153E-01 -6.7008E-02 3.2668E-02 -1.9556E-02 S15 1.6338E-01 8.1573E-03 -1.3211E-02 -1.8379E-03 -6.7442E-03 -1.1408E-03 1.1201E-03

[0100] Table 4-1

[0101]

[0102]

[0103] Table 4-2

[0104] Figure 4AThe axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 4B The chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 4C The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4D The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion value corresponding to different image heights. Figures 4A to 4D It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0105] Example 3

[0106] The following reference Figures 5 to 6D An optical imaging lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Example 3 of the present application is shown.

[0107] like Figure 5 As shown, the optical imaging lens includes, from the object side to the image side along the optical axis, an aperture 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 and an eighth lens E8.

[0108] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens element E8 is a composite lens formed by a lens portion and a base portion. The lens portion has positive refractive power, with a convex object-side surface S15 and a flat image-side surface S16. Both the object-side surface S16 and the image-side surface S17 of the base portion are flat. The optical imaging lens has an imaging surface S18. Light from an object sequentially passes through surfaces S1 to S17 and is ultimately imaged on imaging surface S18.

[0109] Table 5 shows the basic parameters of the optical imaging lens of Example 3, where the units of curvature radius, thickness / distance and effective radius are all millimeters (mm). Table 6-1 and Table 6-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0110]

[0111]

[0112] Table 5

[0113] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.0317E-02 -8.0953E-03 -2.4137E-03 -4.8220E-04 -6.2394E-05 7.0474E-06 -2.0516E-06 S2 -7.0783E-02 7.2906E-03 -2.4900E-03 5.7995E-04 -7.6451E-05 -3.0763E-06 -9.9830E-06 S3 -3.2850E-02 2.0802E-02 -9.7515E-04 1.2071E-03 -6.7775E-05 -1.5800E-05 -1.1028E-05 S4 1.7511E-03 6.3611E-03 -4.0639E-04 4.2932E-04 4.9058E-05 1.7249E-05 6.7984E-06 S5 -1.4773E-01 -8.0840E-03 -1.0880E-03 6.6864E-04 2.4204E-04 8.5999E-05 1.6577E-05 S6 -2.0075E-01 1.5915E-02 4.5747E-03 2.3321E-03 6.1674E-04 -1.0331E-04 -3.4143E-05 S7 -1.3790E-01 5.8038E-02 4.6653E-03 -3.0799E-03 -1.4373E-03 -1.0358E-03 1.4102E-04 S8 -2.0007E-01 5.5477E-02 3.1265E-02 8.3806E-05 -3.4949E-03 -4.8588E-03 -2.7108E-03 S9 -1.6275E-01 -2.8348E-01 5.7017E-02 3.3508E-02 2.1661E-02 1.4349E-03 -2.5791E-03 S10 -1.1732E+00 1.6837E-01 -7.1322E-03 3.6007E-02 -3.4512E-02 1.0104E-02 -4.7337E-04 S11 -5.0303E+00 1.0860E+00 -1.6343E-01 -3.7895E-02 1.8511E-02 1.9474E-02 -2.2006E-02 S12 -2.5782E+00 2.3030E-01 1.1867E-01 -1.1518E-01 4.8444E-02 -2.4696E-03 9.9533E-03 S13 -2.0573E+00 8.7895E-01 -3.7566E-01 1.6128E-01 -7.6786E-02 5.2305E-02 -2.8709E-02 S14 -6.6602E+00 1.5304E+00 -4.5002E-01 1.8714E-01 -9.0155E-02 3.3420E-02 -1.1676E-02 S15 1.5720E-01 5.6822E-01 -6.6231E-02 8.6890E-02 -1.1368E-01 -4.9504E-02 -1.5127E-01

[0114] Table 6-1

[0115]

[0116]

[0117] Table 6-2

[0118] Figure 6A The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 6B The chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 6C The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 6D The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion value corresponding to different image heights. 6A to 6D It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0119] Example 4

[0120] The following reference Figures 7 to 8D An optical imaging lens according to Example 4 of the present application is described. Figure 7A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0121] like Figure 7 As shown, the optical imaging lens includes, from the object side to the image side along the optical axis, an aperture 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 and an eighth lens E8.

[0122] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens element E8 is a composite lens formed by a lens portion and a base portion. The lens portion has negative optical power, with a concave object-side surface S15 and a flat image-side surface S16. Both the object-side surface S16 and the image-side surface S17 of the base portion are flat. The optical imaging lens has an imaging surface S18. Light from an object sequentially passes through surfaces S1 to S17 and is ultimately imaged on imaging surface S18.

[0123] Table 7 shows the basic parameters of the optical imaging lens of Example 4, where the units of curvature radius, thickness / distance and effective radius are all millimeters (mm). Tables 8-1 and 8-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0124]

[0125]

[0126] Table 7

[0127] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.0842E-02 9.7769E-04 -2.4020E-04 -1.5377E-05 -5.6385E-05 1.4458E-05 -1.4765E-05 S2 2.6387E-02 -3.8041E-03 -6.7891E-04 -6.7104E-05 -6.2244E-05 1.5227E-05 5.3317E-06 S3 -6.2977E-02 5.9214E-03 -1.2354E-03 2.7314E-04 -1.1780E-04 3.9443E-05 -7.2455E-06 S4 -5.3285E-02 1.3733E-02 5.0075E-04 4.9295E-04 -3.4051E-05 -5.0883E-06 -1.5214E-05 S5 2.1877E-02 2.6845E-03 9.7197E-04 2.0149E-04 -2.9301E-05 -3.6091E-05 -1.8555E-05 S6 1.4392E-02 2.1524E-03 2.6716E-03 5.7716E-04 1.6009E-04 -1.1891E-04 -1.6657E-05 S7 -1.4353E-01 -7.7852E-03 1.4717E-03 7.0473E-04 4.4248E-04 -2.6433E-04 5.8592E-06 S8 -3.0835E-01 3.7758E-02 5.7958E-04 4.7105E-04 -3.2293E-05 -1.0273E-03 3.4549E-04 S9 -6.9607E-01 8.2110E-02 2.9534E-03 -9.5825E-04 -1.4603E-04 -8.8858E-04 5.2901E-04 S10 -3.2485E-01 1.4950E-02 1.1194E-02 -5.7595E-03 4.7490E-04 2.9177E-04 -1.1293E-04 S11 1.0477E+00 -1.0396E-01 1.0648E-02 -4.9283E-03 1.5117E-03 -4.0298E-04 1.0071E-04 S12 3.9254E-01 5.9979E-02 -3.4866E-02 1.1760E-03 1.3324E-03 -1.2422E-03 7.4138E-04 S13 -2.3846E+00 3.4812E-01 8.6401E-03 -9.6317E-03 -9.7899E-03 6.1323E-03 -1.1140E-03 S14 -1.6186E+00 -6.0827E-02 -1.5894E-02 1.0738E-02 5.4015E-04 6.4746E-03 8.6374E-04 S15 2.8460E+00 -3.1364E-01 -1.1741E-01 7.2950E-02 -5.6165E-02 2.1393E-02 -1.5481E-03

[0128] Table 8-1

[0129] Face number A18 A20 A22 A24 A26 A28 A30 S1 1.0085E-05 -4.9675E-06 4.9706E-06 -5.4046E-06 1.7404E-06 -2.4024E-06 1.6101E-06 S2 -1.0540E-06 -1.2571E-06 -1.7533E-06 7.7016E-07 -7.1655E-07 1.2082E-06 -3.9869E-07 S3 1.2801E-05 1.8536E-07 -5.0178E-08 -8.3397E-06 -4.2682E-06 -2.4737E-06 2.4480E-06 S4 -1.7126E-06 1.1358E-05 6.9629E-06 2.7526E-06 -1.8843E-06 8.7417E-07 2.9589E-07 S5 4.8600E-06 -2.8125E-06 3.0978E-06 -3.7512E-06 -5.5161E-07 -3.7460E-06 2.1461E-06 S6 -3.3115E-05 8.2559E-06 -4.5643E-07 3.5494E-06 3.0814E-07 3.5393E-06 3.1197E-06 S7 -7.0415E-05 -2.3064E-05 -9.8107E-06 6.2215E-06 -6.2321E-07 3.8464E-06 6.6256E-07 S8 -7.5421E-05 4.7178E-05 -9.7206E-06 2.8038E-05 -1.6172E-05 1.3080E-05 -1.1149E-05 S9 2.4903E-05 -1.6051E-05 1.3849E-05 1.9366E-05 -2.3166E-05 8.8767E-06 -1.1716E-05 S10 7.0559E-06 -9.0924E-06 9.5165E-05 3.5442E-05 -1.7857E-05 -3.3245E-06 -1.3309E-05 S11 -9.5447E-05 9.6619E-05 -3.2282E-05 5.8997E-05 -5.4714E-05 5.0735E-06 4.4588E-06 S12 2.0837E-04 -3.8444E-04 -1.7047E-05 2.0833E-04 -4.7078E-05 -6.1383E-05 2.6227E-05 S13 -1.7336E-04 -2.1723E-04 2.4522E-04 -1.2542E-05 -7.3854E-05 9.6012E-06 1.4851E-05 S14 -1.2423E-03 -1.1933E-03 1.7567E-04 -9.7749E-05 2.4613E-05 1.6183E-04 -5.8038E-05 S15 -5.7810E-04 -4.8086E-04 1.8744E-03 -2.2661E-03 3.3946E-04 7.7024E-04 -1.8232E-04

[0130] Table 8-2

[0131] Figure 8A The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 8B The chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 8C The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 8D The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion value corresponding to different image heights. Figures 8A to 8D It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0132] In addition, in Examples 1 to 4, the effective focal lengths f1 to f8 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 to the imaging plane of the optical imaging lens, half the diagonal length of the effective pixel area on the imaging plane ImgH, and the maximum half field of view Semi-FOV of the optical imaging lens are shown in Table 9.

[0133] Parameters / Example 1 2 3 4 f1(mm) 5.97 5.93 5.62 4.84 f2(mm) -16.41 -16.97 -19.02 -8.32 f3(mm) -41.09 -34.04 -20.08 23.27 f4(mm) 23.30 16.17 12.45 -13.47 f5(mm) -8.14 -8.45 -8.13 9.23 f6(mm) 6.59 3.96 5.03 -34.68 f7(mm) 60.12 -4.69 -7.75 11.49 f8(mm) -12.25 204.38 190.10 -9.17 f(mm) 5.99 5.73 5.46 5.69 TTL(mm) 7.29 7.26 7.00 7.22 ImgH(mm) 5.36 5.36 5.05 5.00 Semi-FOV(°) 41.25 42.25 42.07 40.43

[0134] Table 9

[0135] Examples 1 to 4 respectively satisfy the conditions shown in Table 10.

[0136] Conditional formula / Example 1 2 3 4 |CT8-ET8| / BFL 1.37 3.84 0.50 2.24 TTL / (TAN(Semi-FOV)×ImgH) 1.55 1.49 1.54 1.69 ImgH×fno / f 1.54 1.50 1.73 1.71 f / |f1+f2| 0.57 0.52 0.41 1.63 (f3 / f4)+(f5 / f6) -3.00 -4.24 -3.23 -1.99 ∑ET / ∑CT 0.83 0.79 0.91 0.95 (ET7+ET8) / ∑ET 0.33 0.34 0.31 0.40 f2 / |R3-R4| -5.23 -6.44 -7.18 -4.18 R15 / f8 0.52 0.52 0.52 0.34 (T78+CT8) / TTL 0.34 0.20 0.15 0.24 T78 / Tr1r14 0.44 0.10 0.10 0.24 (T67+T78) / ∑AT 0.63 0.52 0.50 0.58 (DT81-DT41) / (DT81-DT11) 1.02 0.99 0.90 0.95 DT81 / DT11 2.93 2.87 3.26 2.95 DT81 / (TAN(Semi-FOV)×ImgH) 1.09 1.06 1.05 1.01

[0137] Table 10

[0138] 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 (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0139] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of protection provided in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of this application. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens element having optical power and a concave image-side surface; a fourth lens having optical power and a convex object-side surface; a fifth lens element having optical power and a concave image-side surface; a sixth lens having optical power, wherein the object-side surface is convex and the image-side surface is concave, or the object-side surface is concave and the image-side surface is convex; a seventh lens element having optical power, the object-side surface of which is convex and the image-side surface of which is concave; and The eighth lens has optical power and is a composite lens including a lens portion and a substrate portion, and has a flat image-side surface. The optical power arrangement of the third lens, the fourth lens, the fifth lens and the sixth lens is negative-positive, negative-positive, and the optical power arrangement of the seventh lens and the eighth lens is positive-negative or negative-positive, or The optical power arrangement of the third lens, the fourth lens, the fifth lens and the sixth lens is positive-negative-positive-negative, and the optical power arrangement of the seventh lens and the eighth lens is positive-negative; The optical imaging lens meets the following requirements: 0.50≤|CT8-ET8| / BFL≤3.84, where CT8 is the center thickness of the eighth lens element on the optical axis, ET8 is the edge thickness of the eighth lens element, and BFL is the distance from the image-side surface of the eighth lens element to the imaging plane of the optical imaging lens element on the optical axis; The number of lenses having optical power in the optical imaging lens is eight.

2. The optical imaging lens according to claim 1, wherein: The distance TTL from the object side of the first lens to the imaging plane along the optical axis, the maximum half field of view Semi-FOV of the optical imaging lens, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: 1.49≤TTL / (TAN(Semi-FOV)×ImgH)<1.

7.

3. The optical imaging lens according to claim 1, wherein: Half the diagonal length ImgH of the effective pixel area on the imaging surface, the aperture value fno of the optical imaging lens, and the effective focal length f of the optical imaging lens satisfy the following conditions: 1.5≤ImgH×fno / f≤1.

73.

4. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy the following conditions: 0.4 <f / |f1+f2|≤1.63。 5. The optical imaging lens according to claim 1, wherein: The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy the following requirements: -4.24≤(f3 / f4)+(f5 / f6)≤-1.

99.

6. The optical imaging lens according to claim 1, wherein: The sum of the edge thicknesses ΣET of each lens from the first lens to the eighth lens and the sum of the center thicknesses ΣCT of each lens from the first lens to the eighth lens on the optical axis satisfy: 0.79≤∑ET / ∑CT≤0.

95.

7. The optical imaging lens according to claim 1, wherein: The sum ΣET of the edge thickness ET7 of the seventh lens, the edge thickness ET8 of the eighth lens, and the edge thickness of each lens from the first lens to the eighth lens satisfies: 0.3<(ET7+ET8) / ∑ET≤0.

40.

8. The optical imaging lens according to claim 1, wherein: The effective focal length f2 of the second 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: -7.18≤f2 / |R3-R4|≤-4.

18.

9. The optical imaging lens according to claim 1, wherein: The curvature radius R15 of the object-side surface of the eighth lens and the effective focal length f8 of the eighth lens satisfy: 0.3 <R15 / f8<0.56。 10. The optical imaging lens according to any one of claims 1 to 9, wherein: The distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, and the distance TTL from the object side surface of the first lens to the imaging plane along the optical axis satisfy: 0.12<(T78+CT8) / TTL<0.

37.

11. The optical imaging lens according to any one of claims 1 to 9, wherein: The distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens on the optical axis and the distance Tr1r14 from the object side surface of the first lens to the image side surface of the seventh lens along the optical axis satisfy: 0.10≤T78 / Tr1r14<0.

47.

12. The optical imaging lens according to any one of claims 1 to 9, wherein: The sum of the distance T67 on the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens, the distance T78 on the optical axis from the image side surface of the seventh lens to the object side surface of the eighth lens, and the air spacing ΣAT between any two adjacent lenses from the first lens to the eighth lens on the optical axis satisfies: 0.5≤(T67+T78) / ∑AT<0.

67.

13. The optical imaging lens according to any one of claims 1 to 9, wherein: The effective radius DT81 of the object-side surface of the eighth lens, the effective radius DT41 of the object-side surface of the fourth lens, and the effective radius DT11 of the object-side surface of the first lens satisfy: 0.9≤(DT81-DT41) / (DT81-DT11)<1.

06.

14. The optical imaging lens according to any one of claims 1 to 9, wherein: The effective radius DT81 of the object-side surface of the eighth lens and the effective radius DT11 of the object-side surface of the first lens satisfy: 2.87≤DT81 / DT11≤3.

26.

15. The optical imaging lens according to any one of claims 1 to 9, wherein: The effective radius DT81 of the object side of the eighth lens, the maximum half field angle Semi-FOV of the optical imaging lens, and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following conditions: 1 <DT81 / (TAN(Semi-FOV)×ImgH) <1.1。 16. The optical imaging lens according to any one of claims 1 to 9, wherein: The substrate portion is an infrared cutoff filter.

17. The optical imaging lens according to any one of claims 1 to 9, wherein: An infrared cutoff layer is provided on the image-side surface of the eighth lens.

18. The optical imaging lens according to any one of claims 1 to 9, wherein: The substrate is made of flat glass.

19. The optical imaging lens according to claim 18, wherein: The lens portion has an aspherical surface and is formed of a force-deformable material.

20. The optical imaging lens according to claim 19, wherein: The eighth lens is a composite lens having the lens portion and the substrate portion, which is formed by pasting the stress-deformable material on the flat glass and then embossing the stress-deformable material.

Images