Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, a lens set and a plurality of spacer elements arranged in the lens barrel, wherein the lens set comprises, in sequence from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the sixth lens has positive refractive power, the object side surface of the sixth lens is a convex surface, the image side surface of the sixth lens is a convex surface, the seventh lens has positive refractive power or negative refractive power, the eighth lens has negative refractive power, the plurality of spacer elements comprises a sixth spacer element and a seventh spacer element, the radius of curvature R13 of the object side surface of the seventh lens, the radius of curvature R16 of the image side surface of the eighth lens, the distance EP67 between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis direction, the maximum thickness CP7 of the seventh spacer element along the optical axis direction, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy the condition: 1.0 < (R13+R16) / (EP67+CP7+T78) < 5.0.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical imaging lens. Background Technology

[0002] As competition in the smartphone market intensifies, the demands on optical lenses are increasing. Beyond assessing key optical parameters and yield rates, end-user manufacturers are placing increasingly stringent requirements on ghosting and stray light. With the increasing number of lenses, the ability to suppress the quantity and intensity of ghosting produced by each lens is a crucial evaluation criterion for product competitiveness and design capabilities. This is especially true for rear-mounted lenses. In addition to ghosting generated by interactions with the front lenses, the presence of color filters at the rear of the lens, which exhibit significant variations in reflectivity across different wavelengths, means that light rays with high reflectivity, when incident at large angles and reflected by the color filter, can easily cause ghosting in lenses closer to the filter after interaction with the rear lenses.

[0003] Therefore, for eight-element lenses, how to control the intensity and quantity of ghosting in the rear lens while ensuring better image quality has become one of the urgent problems to be solved. Summary of the Invention

[0004] This application provides an optical imaging lens comprising: a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel; wherein the lens group comprises, sequentially from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the sixth lens has positive optical power, and its object side and image side are convex; the seventh lens has positive or negative optical power; the eighth lens has negative optical power; and the plurality of spacers include: spacers disposed on the image side of the sixth lens and spaced from the image side of the sixth lens. The sixth spacer element is at least partially in contact with the side of the seventh lens, and the seventh spacer element is placed on the image side of the seventh lens and is at least partially in contact with the image side of the seventh lens; the radius of curvature R13 of the object side of the seventh lens, the radius of curvature R16 of the image side of the eighth lens, the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis, the maximum thickness CP7 of the seventh spacer element along the optical axis, and the air gap T78 between the seventh and eighth lenses on the optical axis satisfy: 1.0 < (R13 + R16) / (EP67 + CP7 + T78) < 5.0.

[0005] In one embodiment, the plurality of spacer elements further includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; wherein the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: 0 <f1 / d1s<10.0。

[0006] In one embodiment, the plurality of spacer elements further includes: a first spacer element disposed on the image side of the first lens and at least partially contacting the image side surface of the first lens; wherein, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer element, and the outer diameter D1s of the object side surface of the first spacer element satisfy: 0 < R1 < R2 and 2.0 < (R1 + R2) / (D1s - d1s) < 30.0.

[0007] In one embodiment, the distance EP67 along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the dispersion coefficient V6 of the sixth lens, and the dispersion coefficient V7 of the seventh lens satisfy: 5.0 < EP67×(V6 / f6 + V7 / f7) < 20.0.

[0008] In one embodiment, the plurality of spacer elements further includes: a third spacer element disposed on the image side of the third lens and at least partially contacting the image side surface of the third lens; a fourth spacer element disposed on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens; and a fifth spacer element disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; wherein, the inner diameter d3m of the image side surface of the third spacer element, the inner diameter d4m of the image side surface of the fourth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element, and the combined focal length f345 of the third, fourth, and fifth lenses satisfy: 0 < (d3m + d4m + d5m) / f345 < 5.0.

[0009] In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 0 < f6 < |f5|.

[0010] In one embodiment, the plurality of spacer elements further includes: a fifth spacer element disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; wherein, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the distance EP56 along the optical axis between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, the refractive index N5 of the fifth lens, and the refractive index N6 of the sixth lens satisfy: -5.0 < (f5 - f6) / [EP56×(N5 + N6)] < 5.0.

[0011] In one embodiment, the plurality of spacer elements further includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side of the first lens; a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens; and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; wherein the air gap T12 between the first and second lenses on the optical axis, the air gap T23 between the second and third lenses on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and the distance EP23 between the image side of the second spacer element and the object side of the third spacer element along the optical axis satisfy: (T12+CT2+T23+CT3) / |EP12-EP23|<10.0.

[0012] In one embodiment, the radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, and the radius of curvature R16 of the image side of the eighth lens satisfy: R14 / f>0, R15 / f<0, and R16 / f>0.

[0013] In one embodiment, the plurality of spacer elements further includes an eighth spacer element, which is disposed on the image side of the eighth lens and at least partially contacts the image side of the eighth lens; wherein the radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, the outer diameter D7m of the image side of the seventh spacer element, and the outer diameter D8m of the image side of the eighth spacer element satisfy: 10.0 < (R14-R15) / (D7m-D8m) < 50.0.

[0014] In one embodiment, the plurality of spacer elements further includes an eighth spacer element, disposed on the image side of the eighth lens and at least partially in contact with the image side surface of the eighth lens; wherein the combined focal length f78 of the seventh and eighth lenses, the refractive index N7 of the seventh lens, the refractive index N8 of the eighth lens, and the distance EP78 between the image side surface of the seventh spacer element and the object side surface of the eighth spacer element along the optical axis satisfy: -50.0 <f78×(N7+N8) / EP78<-30.0。

[0015] In one embodiment, the height L of the lens barrel along the optical axis and the axial distance TD from the object side of the first lens to the image side of the eighth lens satisfy: L / TD<1.5.

[0016] In one embodiment, the plurality of spacers further includes: a fifth spacer, disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens; and an eighth spacer, disposed on the image side of the eighth lens and at least partially in contact with the image side of the eighth lens; wherein the distance EP56 between the image side of the fifth spacer and the object side of the sixth spacer along the optical axis, the distance EP67 between the image side of the sixth spacer and the object side of the seventh spacer along the optical axis, the distance EP78 between the image side of the seventh spacer and the object side of the eighth spacer along the optical axis, and the axial distance TD between the object side of the first lens and the image side of the eighth lens satisfy: (EP56+EP67+EP78) / TD<0.6.

[0017] In one embodiment, the plurality of spacer elements further includes an eighth spacer element, disposed on the image side of the eighth lens and at least partially in contact with the image side surface of the eighth lens; wherein the dispersion coefficient V8 of the eighth lens, the center thickness CT7 of the seventh lens along the optical axis, the center thickness CT8 of the eighth lens along the optical axis, the distance EP78 between the image side surface of the seventh spacer element and the object side surface of the eighth spacer element along the optical axis, and the effective focal length f8 of the eighth lens satisfy: -10.0 <V8×(CT7+CT8+EP78) / f8<-5.0。

[0018] In one embodiment, the effective focal length f of the optical imaging lens, the maximum field of view (FOV) of the optical imaging lens, the outer diameter D0m of the image-side end face of the lens barrel, and the inner diameter d0m of the image-side end face of the lens barrel satisfy: 5.0 <f×tan(FOV / 2) / (D0m-d0m)<11.0。

[0019] In one embodiment, the plurality of spacers further includes: a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens; and a fifth auxiliary spacer element disposed on the image side of the fifth spacer element and at least partially in contact with the fifth spacer element; wherein the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the air gap T56 of the fifth and sixth lenses on the optical axis, and the maximum thickness CP5b of the fifth auxiliary spacer element along the optical axis satisfy: 1.0 < (CT5 + T56 + CT6) / CP5b < 5.0.

[0020] In one embodiment, the plurality of spacers further includes a fifth auxiliary spacer element disposed on the image side of the fifth auxiliary spacer element and in at least partial contact with the fifth auxiliary spacer element; wherein the radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, the inner diameter d5bs of the object side of the fifth auxiliary spacer element, and the inner diameter d5cs of the object side of the fifth auxiliary spacer element satisfy: -4.0 < (R10-R11) / (d5bs+d5cs) < -1.0.

[0021] In one embodiment, the first lens has positive optical power, with its object side being convex and its image side being concave.

[0022] The optical imaging lens provided in this application includes eight lenses and multiple spacer elements. By controlling the focal length of the sixth, seventh, and eighth lenses, the radius of curvature of the object side of the seventh lens, the radius of curvature of the image side of the eighth lens, adjusting the distance along the optical axis between the image side of the sixth spacer element and the object side of the seventh spacer element, the maximum thickness of the seventh spacer element along the optical axis, and the air gap between the seventh and eighth lenses on the optical axis, this application helps to control the distance between the rear lenses along the optical axis and the thickness of the spacer elements, while ensuring better image quality. This reduces ghosting caused by large-angle light reflection due to the large difference in reflectivity of the color filter at different wavelengths, thereby controlling the intensity and number of ghosting images generated by the rear lenses. Attached Figure Description

[0023] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to this application are shown;

[0025] Figures 2A to 2C A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown;

[0026] Figures 3A to 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0027] Figures 4A to 4C A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0028] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0029] Figures 6A to 6C A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown;

[0030] Figures 7A to 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 of this application are shown respectively.

[0031] Figure 8A and Figure 8BThe following are simulated ghost images of an optical imaging lens according to this application with and without a color filter at an incident angle of 30°; and

[0032] Figure 8C and Figure 8D The images show simulated ghost images of an optical imaging lens according to this application with and without a color filter at an incident angle of 40°. Detailed Implementation

[0033] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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.

[0034] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0035] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0036] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 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.

[0037] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0038] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel, and spacer element in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel, spacer element, etc. of that embodiment.

[0040] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1 This diagram illustrates the structural layout and schematic diagram of some parameters of an optical imaging lens according to this application. Those skilled in the art will understand that some lens parameters frequently used in the art, such as the center thickness CT2 of the second lens on the optical axis, are not shown. Figure 1 As shown in the figure, Figure 1 The present application only exemplarily illustrates some parameters of the lens barrel and spacer element of an optical imaging lens to facilitate a better understanding of the invention. Figure 1As shown, L is the height of the lens barrel along the optical axis, CP7 is the maximum thickness of the seventh spacer element along the optical axis, CP5b is the maximum thickness of the fifth auxiliary spacer element along the optical axis, EP12 is the distance between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis, EP23 is the distance between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis, EP56 is the distance between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis, EP67 is the distance between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis, and EP78 is the distance between the seventh spacer element and the object-side surface of the seventh spacer element. The distance along the optical axis between the image-side surface of the first spacer element and the object-side surface of the eighth spacer element, where d1s is the inner diameter of the object-side surface of the first spacer element, d3m is the inner diameter of the image-side surface of the third spacer element, d5cs is the inner diameter of the object-side surface of the fifth auxiliary spacer element, D4m is the outer diameter of the image-side surface of the fourth spacer element, D5m is the outer diameter of the image-side surface of the fifth spacer element, d5bs is the inner diameter of the object-side surface of the fifth auxiliary spacer element, D7m is the outer diameter of the image-side surface of the seventh spacer element, D8m is the outer diameter of the image-side surface of the eighth spacer element, D0m is the outer diameter of the image-side end face of the lens barrel, and d0m is the inner diameter of the image-side end face of the lens barrel.

[0041] An optical imaging lens according to an exemplary embodiment of this application includes a lens barrel and a lens group and a plurality of spacer elements disposed within the lens barrel. The lens group includes 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 arranged sequentially along the optical axis from the object side to the image side. The sixth lens has positive optical power, and its object side and image side are both convex; the seventh lens has either positive or negative optical power; and the eighth lens has negative optical power.

[0042] In an exemplary embodiment, the plurality of spacer elements includes a sixth spacer element disposed on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens, and a seventh spacer element disposed on the image side of the seventh lens and in at least partial contact with the image side surface of the seventh lens.

[0043] In an exemplary embodiment, the plurality of spacer elements may include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, a seventh spacer element, and an eighth spacer element; wherein, the first spacer element is disposed on the image side of the first lens and at least partially in contact with the image side of the first lens, the second spacer element is disposed on the image side of the second lens and at least partially in contact with the image side of the second lens, the third spacer element is disposed on the image side of the third lens and at least partially in contact with the image side of the third lens, the fourth spacer element is disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens, the fifth spacer element is disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens, the sixth spacer element is disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens, the seventh spacer element is disposed on the image side of the seventh lens and at least partially in contact with the image side of the seventh lens, and the eighth spacer element is disposed on the image side of the eighth lens and at least partially in contact with the image side of the eighth lens.

[0044] In an exemplary embodiment, the plurality of spacers further includes a fifth auxiliary spacer element disposed on the image side of the fifth spacer element and in at least partial contact with the fifth spacer element. Further, the plurality of spacers also includes a fifth secondary auxiliary spacer element disposed on the image side of the fifth auxiliary spacer element and in at least partial contact with the fifth auxiliary spacer element.

[0045] It should be understood that this application does not specifically limit the number of spacers; any number of spacers may be included between any two lenses, and the entire optical imaging lens may also include any number of spacers. Spacers help the optical imaging lens intercept excess reflective light paths, reducing stray light and ghosting. Adding auxiliary support between the spacers and the lens barrel helps improve problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0046] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 1.0 < (R13 + R16) / (EP67 + CP7 + T78) < 5.0, where R13 is the curvature radius of the object side surface of the seventh lens, R16 is the curvature radius of the image side surface of the eighth lens, EP67 is the distance along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, CP7 is the maximum thickness of the seventh spacer element along the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis. By controlling the curvature radius of the object side surface of the seventh lens, the curvature radius of the image side surface of the eighth lens, regulating the distance along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, the maximum thickness of the seventh spacer element along the optical axis, and the air gap between the seventh lens and the eighth lens on the optical axis, the present application helps to control the distance of the rear lens in the optical axis direction and the thickness of the spacer element while ensuring better imaging quality of the lens, and reduces the ghost image problem caused by large-angle light reflection due to the large difference in reflectivity of the color filter in different wavelength bands, thereby controlling the intensity and number of ghost images generated by the rear lens.

[0047] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 < f1 / d1s < 10.0, where f1 is the effective focal length of the first lens and d1s is the inner diameter of the object side surface of the first spacer element. By controlling the ratio of the effective focal length of the first lens and the inner diameter of the object side surface of the first spacer element, the present application limits the front-end size of the lens, avoids the problems of excessive assembly step difference and unstable assembly caused by the excessive difference in the outer diameter sizes of the front and rear lenses, and reduces the sensitivity of the optical system.

[0048] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 < R1 < R2 and 2.0 < (R1 + R2) / (D1s - d1s) < 30.0, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, and D1s is the outer diameter of the object side surface of the first spacer element. By controlling the curvature radii on both sides of the first lens and the difference between the inner and outer diameters of the first spacer element, the present application regulates the overall shape of the optical part of the lens and the size of the structural part, and reduces the molding difficulty of the lens.

[0049] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 5.0 < EP67×(V6 / f6 + V7 / f7) < 20.0, where EP67 is the distance between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis direction, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, V6 is the dispersion coefficient of the sixth lens, and V7 is the dispersion coefficient of the seventh lens. By controlling the proportional relationship between the distance between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis direction and the effective focal lengths and dispersion coefficients of the sixth and seventh lenses, the present application is beneficial to adjusting the dispersion performance of the optical system when the dispersion of the optical system exceeds the tolerance.

[0050] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0 < (d3m + d4m + d5m) / f345 < 5.0, where d3m is the inner diameter of the image side of the third spacer element, d4m is the inner diameter of the image side of the fourth spacer element, d5m is the inner diameter of the image side of the fifth spacer element, and f345 is the combined focal length of the third, fourth, and fifth lenses. By controlling the ratio of the inner diameters of the third, fourth, and fifth spacer elements to the combined focal length of the third, fourth, and fifth lenses, the present application minimizes the risk of stray light and reduces the sensitivity of the optical system while meeting the specification of relative illumination.

[0051] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0 < f6 < |f5|, where f5 is the effective focal length of the fifth lens and f6 is the effective focal length of the sixth lens. Controlling the effective focal length of the fifth lens to be greater than the effective distance of the sixth lens is beneficial to regulating the optical axis distance between the fifth and sixth lenses.

[0052] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -5.0 < (f5 - f6) / [EP56×(N5 + N6)] < 5.0, where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis direction, N5 is the refractive index of the fifth lens, and N6 is the refractive index of the sixth lens. By restricting the refractive indices of the fifth and sixth lenses and the optical axis distance between the fifth and sixth spacer elements, it is beneficial to control the distance between the fifth and sixth lenses.

[0053] In an exemplary embodiment, the optical imaging lens according to this application satisfies: (T12+CT2+T23+CT3) / |EP12-EP23|<10.0, where T12 is the air gap between the first and second lenses on the optical axis, T23 is the air gap between the second and third lenses on the optical axis, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, EP12 is the distance along the optical axis between the image-side surface of the first spacer element and the object-side surface of the second spacer element, and EP23 is the distance along the optical axis between the image-side surface of the second spacer element and the object-side surface of the third spacer element. By controlling the sum of the center thicknesses and air gaps of the first three lenses and the difference between the optical axis distances of the second and third spacers, the position of the first three lenses is controlled. By moving the position of the front lens forward, space is reserved for the design of the rear lens, while reducing the lens curvature of the front lens, thus reducing instability in molding and assembly.

[0054] In an exemplary embodiment, the optical imaging lens according to this application satisfies: R14 / f>0, R15 / f<0, and R16 / f>0, where R14 is the radius of curvature of the image-side surface of the seventh lens, R15 is the radius of curvature of the object-side surface of the eighth lens, and R16 is the radius of curvature of the image-side surface of the eighth lens. By controlling the positive and negative values ​​of the radii of curvature of the seventh and eighth lenses, the contribution of advanced spherical aberration to the system can be controlled to a certain extent, enabling the system to have good imaging quality.

[0055] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 10.0 < (R14-R15) / (D7m-D8m) < 50.0, where R14 is the radius of curvature of the image-side surface of the seventh lens, R15 is the radius of curvature of the object-side surface of the eighth lens, D7m is the outer diameter of the image-side surface of the seventh spacer element, and D8m is the outer diameter of the image-side surface of the eighth spacer element. This application, by controlling the difference in the radius of curvature of the image-side surfaces of the seventh and eighth lenses and the difference in the outer diameters of the image-side surfaces of the seventh and eighth spacers, facilitates control of the position and radius of curvature of the seventh lens while ensuring the manufacturability of the eighth lens.

[0056] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -50.0 < f78×(N7 + N8) / EP78 < -30.0, where f78 is the combined focal length of the seventh lens and the eighth lens, N7 is the refractive index of the seventh lens, N8 is the refractive index of the eighth lens, and EP78 is the distance between the image side of the seventh spacer element and the object side of the eighth spacer element along the optical axis direction. The present application has a relatively large number of lenses. Due to the special positions of the sixth lens and the seventh lens, by controlling the combined focal length, refractive indices of the seventh lens and the eighth lens, and the distance between the seventh spacer element and the eighth spacer element along the optical axis direction, the effect of converging the optical path on the image plane can be achieved.

[0057] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: L / TD < 1.5, where L is the height of the lens barrel along the optical axis direction, and TD is the on-axis distance from the object side of the first lens to the image side of the eighth lens. Satisfying L / TD < 1.5 is beneficial to controlling the height of the lens barrel and the total length of the optical imaging lens, achieving the effect of reducing the lens size.

[0058] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: (EP56 + EP67 + EP78) / TD < 0.6, where EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis direction, EP67 is the distance between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis direction, EP78 is the distance between the image side of the seventh spacer element and the object side of the eighth spacer element along the optical axis direction, and TD is the on-axis distance from the object side of the first lens to the image side of the eighth lens. The present application调配 the positions of the front-end and rear-end lenses of the lens by controlling the ratio of the distances between the fifth spacer element, the sixth spacer element, the seventh spacer element, and the eighth spacer element on the optical axis to the length of the lens group, ensuring that the rear-end lens has sufficient configuration space without overly encroaching on the design space of the front-end lens.

[0059] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -10.0 < V8×(CT7 + CT8 + EP78) / f8 < -5.0, where V8 is the dispersion coefficient of the eighth lens, 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, EP78 is the distance between the image side of the seventh spacer element and the object side of the eighth spacer element along the optical axis direction, and f8 is the effective focal length of the eighth lens. Satisfying -10.0 < V8×(CT7 + CT8 + EP78) / f8 < -5.0 is beneficial to regulating the dispersion of the optical imaging lens. When the dispersion exceeds the tolerance, the dispersion performance can be improved by adjusting the parameters of the seventh lens and the eighth lens.

[0060] It should be noted that there is an inappropriate expression "调配" in the translation of , which should be a more accurate word according to the context. You can adjust it according to the actual situation.In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 5.0 < f × tan(FOV / 2) / (D0m - d0m) < 11.0, where f is the effective focal length of the optical imaging lens, FOV is the maximum field angle of the optical imaging lens, D0m is the outer diameter of the image-side end face of the lens barrel, and d0m is the inner diameter of the image-side end face of the lens barrel. By controlling the effective focal length of the optical imaging lens, the maximum field angle, and the inner and outer diameter dimensions of the image-side end face of the lens barrel, the purpose of controlling the ratio of the lens barrel size to the image plane size is achieved.

[0061] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.0 < (CT5 + T56 + CT6) / CP5b < 5.0, where CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CP5b is the maximum thickness of the fifth auxiliary spacer element along the optical axis direction. By controlling the ratio of the central thicknesses of the fifth lens and the sixth lens, the air gap, and the thickness of the fifth auxiliary spacer element, the purpose of controlling the edge thicknesses of the fifth lens and the sixth lens is achieved, reducing the molding risk.

[0062] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -4.0 < (R10 - R11) / (d5bs + d5cs) < -1.0, where R10 is the curvature radius of the image-side surface of the fifth lens, R11 is the curvature radius of the object-side surface of the sixth lens, d5bs is the inner diameter of the object-side surface of the fifth auxiliary spacer element, and d5cs is the inner diameter of the object-side surface of the fifth auxiliary spacer element. By controlling the ratio of the difference between the curvature radius of the image-side surface of the fifth lens and the curvature radius of the object-side surface of the sixth lens to the sum of the inner diameters of the fifth auxiliary spacer element and the fifth auxiliary spacer element, it is beneficial to control the overall shape ratio of the lens and reduce the molding risk of the lens.

[0063] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical 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 surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object-side surfaces and image-side surfaces of all the lenses from the first lens to the eighth lens are aspherical surfaces.

[0064] In an exemplary embodiment, the first lens has positive optical power, with its object-side surface being convex and its image-side surface being concave. Properly setting the optical power and surface shape of the first lens is beneficial for converging light rays and controlling the angle of the incident light.

[0065] In an exemplary embodiment, the first lens may have positive optical power, the second lens may have positive or negative optical power, the third lens may have positive or negative optical power, the fourth lens may have positive or negative optical power, the fifth lens may have positive or negative optical power, the sixth lens may have positive optical power, the seventh lens may have positive or negative optical power, and the eighth lens may have negative optical power.

[0066] In an exemplary embodiment, the optical imaging lens may further include a color filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0067] Since color filters are generally present at the rear of lenses, and these filters have significantly different reflectivities for different wavelengths, light rays with high reflectivity, when incident at large angles and reflected by the color filter, can easily cause ghosting on the lenses relatively close to the color filter after interacting with the rear lens elements. Typically, ghosting caused by color filters mainly occurs at light incident angles of approximately 0° to 40°. One important way to reduce the risk of ghosting is to bring the ghosting area closer to the light source. When the light incident angle is 0° to 30°, the light source is mainly focused within the image plane; however, when the light incident angle is 30° to 40°, the light source gradually moves away from the image plane, increasing the risk of ghosting. Methods can be used to bring the ghosting closer to the upper part of the image plane to reduce this risk. This application presents simulated ghosting scenarios at incident angles of 30° and 40° as examples. Figure 8A and Figure 8B The following are simulated ghost images of an optical imaging lens according to this application with and without a color filter at an incident angle of 30°. Figure 8C and Figure 8D The images show simulated ghosting effects of an optical imaging lens according to this application at an incident angle of 40° with and without a color filter. A comparison is provided. Figure 8A and Figure 8B It can be observed that, Figure 8A Without a color filter, there are virtually no ghosting effects; after adding a color filter, as... Figure 8B As shown, although a ghost image appears, its position is near the light source at the top of the image surface, posing a low risk. Similarly, through comparison... Figure 8C and Figure 8D It can be observed that, Figure 8C Without a color filter, there are virtually no ghosting effects; after adding a color filter, as... Figure 8DAs shown, there is almost no new ghosting. Therefore, it can be concluded that the optical imaging lens provided in this application reduces the ghosting problem caused by the reflection of light at large angles by the color filter.

[0068] The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-tube engagement is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the ultra-thin, large-image-plane imaging lens. However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0069] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.

[0070] Example 1

[0071] The following is for reference Figures 2A to 3D The optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of this application are described. Figures 2A to 2C Schematic diagrams of the optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of this application are shown respectively.

[0072] like Figures 2A to 2C As shown, optical imaging lenses 1001, 1002 and 1003 each include a lens barrel P0, lens groups E1 to E8 and multiple spacer elements P1 to P8.

[0073] like Figures 2A to 2CAs shown, optical imaging lenses 1001, 1002, and 1003 employ the same lens group, which, from the object side to the image side, sequentially includes: 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0074] Table 1 shows the basic parameters of the lens groups of optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 in Embodiment 1, wherein the units of radius of curvature, thickness and effective focal length are all millimeters (mm).

[0075]

[0076]

[0077] Table 1

[0078] In this example, the effective focal length f of optical imaging lenses 1001, 1002, and 1003 is 7.50 mm, the combined focal length f345 of the third, fourth, and fifth lenses is 6.67 mm, and the combined focal length f78 of the seventh and eighth lenses is -5.26 mm; the maximum field of view FOV of optical imaging lenses 1001, 1002, and 1003 is 80.0°, and the distance TTL from the object side surface of the first lens of optical imaging lenses 1001, 1002, and 1003 to the imaging surface on the optical axis is 9.8 mm.

[0079] In Embodiment 1, the object-side surface and image-side surface 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 using, but is not limited to, the following aspherical formula:

[0080]

[0081] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A16, A26, A36, A47, A68, A166 that can be used for each aspherical mirror S1-S16 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0082]

[0083]

[0084] Table 2

[0085] like Figures 2A to 2C As shown, optical imaging lenses 1001, 1002 and 1003 each include 10 spacer elements, namely, first spacer element P1, second spacer element P2, third spacer element P3, fourth spacer element P4, fifth spacer element P5, fifth auxiliary spacer element P5b, fifth secondary auxiliary spacer element P5c, sixth spacer element P6, seventh spacer element P7 and eighth spacer element P8. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is placed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is placed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the fifth auxiliary spacer element P5b is placed on the image side of the fifth spacer element and is at least partially in contact with the image side surface of the fifth spacer element; the fifth secondary auxiliary spacer element P5c is placed on the image side of the fifth auxiliary spacer element and is at least partially in contact with the image side surface of the fifth auxiliary spacer element; the sixth spacer element P6 is placed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is placed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth spacer element P8 is placed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens. The aforementioned spacer element can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003.

[0086] Table 3 shows the basic parameters of the spacer elements and lens barrels of the optical imaging lenses 1001, 1002 and 1003 of Embodiment 1. The unit of each parameter in Table 3 is millimeters (mm).

[0087]

[0088]

[0089] Table 3

[0090] Figure 3A The on-axis chromatic aberration curves of optical imaging lenses 1001, 1002 and 1003 of Embodiment 1 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B The astigmatism curves of optical imaging lenses 1001, 1002 and 1003 of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of optical imaging lenses 1001, 1002 and 1003 of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curves of optical imaging lenses 1001, 1002, and 1003 of Embodiment 1 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 3A to 3D It can be seen that the optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 given in Example 1 can achieve good imaging quality.

[0091] Example 2

[0092] The following is for reference Figures 4A to 5D The optical imaging lens 2001, optical imaging lens 2002, and optical imaging lens 2003 according to Embodiment 2 of this application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 4A to 4C Schematic diagrams of the optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of this application are shown respectively.

[0093] like Figures 4A to 4C As shown, optical imaging lenses 2001, 2002 and 2003 each include a lens barrel P0, lens groups E1 to E8 and multiple spacer elements P1 to P8.

[0094] like Figures 4A to 4CAs shown, optical imaging lenses 2001, 2002, and 2003 employ the same lens group, which, from the object side to the image side, sequentially includes: 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0095] In this example, the effective focal length f of optical imaging lenses 2001, 2002, and 2003 is 7.50 mm; the combined focal length f345 of the third, fourth, and fifth lenses is 6.75 mm; and the combined focal length f78 of the seventh and eighth lenses is -5.29 mm. The maximum field of view (FOV) of optical imaging lenses 2001, 2002, and 2003 is 80.0°; and the distance TTL from the object side surface of the first lens of optical imaging lenses 2001, 2002, and 2003 to the imaging surface on the optical axis is 9.8 mm.

[0096] Table 4 shows the basic parameters of the lens groups of optical imaging lenses 2001, 2002 and 2003 in Embodiment 2, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0097]

[0098] Table 4

[0099]

[0100]

[0101] Table 5

[0102] like Figures 4A to 4CAs shown, optical imaging lenses 2001, 2002, and 2003 each include 10 spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary auxiliary spacer element P5c, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The positions of these 10 spacer elements are the same as those of the 10 spacer elements in Embodiment 1, and will not be described again. These spacer elements can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging lenses 2001, 2002, and 2003.

[0103] Table 6 shows the basic parameters of the spacer elements and lens barrels of optical imaging lenses 2001, 2002 and 2003 in Embodiment 2. The unit of each parameter in Table 6 is millimeters (mm).

[0104] Parameters / Optical Imaging Lens Optical Imaging Lens 2001 Optical Imaging Lens 2002 Optical Imaging Lens 2003 d1s 4.4750 4.4820 4.4890 d3m 4.5550 4.5500 4.5510 d4m 5.2970 5.3120 5.4230 D4m 7.0450 8.6390 7.9820 d5m 5.8930 5.8930 5.8930 D7m 11.0080 11.0080 11.5120 D8m 10.3550 10.5370 10.5470 d0m 11.4780 11.4070 11.6520 D0m 12.2610 12.2610 12.2610 EP12 0.6980 0.7050 0.7150 EP23 0.5380 0.5350 0.5340 EP56 1.6709 1.6624 1.6709 EP67 1.5710 1.6210 1.6260 CP7 0.0220 0.0220 0.0220 EP78 0.4270 0.3650 0.3730 L 8.8460 8.8180 8.8280 d5bs 6.7590 6.7590 6.0580 CP5b 1.1250 1.1800 1.1670 d5cs 6.2250 6.2390 6.2350 D1s 6.7770 8.3390 6.1340

[0105] Table 6

[0106] Figure 5A The on-axis chromatic aberration curves of optical imaging lenses 2001, 2002 and 2003 of Embodiment 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B The astigmatism curves of optical imaging lenses 2001, 2002 and 2003 of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curves of optical imaging lenses 2001, 2002 and 2003 of Embodiment 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of optical imaging lenses 2001, 2002, and 2003 of Embodiment 2 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 5A to 5D It can be seen that the optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 given in Example 2 can achieve good imaging quality.

[0107] Example 3

[0108] The following is for reference Figures 6A to 7D The optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of this application are described. Figures 6A to 6CSchematic diagrams of the optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of this application are shown respectively.

[0109] like Figures 6A to 6C As shown, optical imaging lenses 3001, 3002 and 3003 each include a lens barrel P0, lens groups E1 to E8 and multiple spacer elements P1 to P8.

[0110] like Figures 6A to 6C As shown, optical imaging lenses 3001, 3002, and 3003 employ the same lens group, which, from the object side to the image side, sequentially includes: 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0111] In this example, the effective focal length f of optical imaging lenses 3001, 3002, and 3003 is 7.50 mm, the combined focal length f345 of the third, fourth, and fifth lenses is 8.27 mm, and the combined focal length f78 of the seventh and eighth lenses is -5.14 mm; the maximum field of view FOV of optical imaging lenses 3001, 3002, and 3003 is 80.0°, and the distance TTL from the object side surface of the first lens of optical imaging lenses 3001, 3002, and 3003 to the imaging surface on the optical axis is 9.8 mm.

[0112] Table 7 shows the basic parameters of the lens groups of optical imaging lenses 3001, 3002 and 3003 in Embodiment 3, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0113]

[0114]

[0115] Table 7

[0116]

[0117] Table 8

[0118] like Figures 6A to 6C As shown, optical imaging lenses 3001, 3002, and 3003 each include 10 spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary auxiliary spacer element P5c, a sixth spacer element P6, a seventh spacer element P7, and an eighth spacer element P8. The positions of these 10 spacer elements are the same as those of the 10 spacer elements in Embodiment 1, and will not be described again. These spacer elements can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging lenses 3001, 3002, and 3003.

[0119] Table 9 shows the basic parameters of the spacer elements and lens barrels of optical imaging lenses 3001, 3002 and 3003 in Embodiment 3. The unit of each parameter in Table 9 is millimeters (mm).

[0120]

[0121]

[0122] Table 9

[0123] Figure 7A The on-axis chromatic aberration curves of optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of optical imaging lenses 3001, 3002, and 3003 of Embodiment 3 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 7A to 7DIt can be seen that the optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 given in Example 3 can achieve good imaging quality.

[0124] In summary, the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Examples 1 to 3 satisfy the relationship shown in Table 10.

[0125]

[0126]

[0127] Table 10

[0128] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone 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.

[0129] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, Comprising: A lens barrel, a lens group, and a plurality of spacer elements disposed within the lens barrel, wherein, The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the first lens has a positive optical power, its object side is convex, and its image side is concave; the image side of the second lens is concave; the object side of the third lens is convex; the image side of the fifth lens is convex; the sixth lens has a positive optical power, its object side is convex, and its image side is convex; the seventh lens has a positive or negative optical power, its image side is concave; the eighth lens has a negative optical power, its object side is concave, and its image side is concave; and The plurality of spacer elements includes: a sixth spacer element disposed on the image side of the sixth lens and at least partially contacting the image side of the sixth lens, a seventh spacer element disposed on the image side of the seventh lens and at least partially contacting the image side of the seventh lens, and an eighth spacer element disposed on the image side of the eighth lens and at least partially contacting the image side of the eighth lens; The number of lenses with optical power in the optical imaging lens is eight; The radius of curvature R13 of the object side of the seventh lens, the radius of curvature R16 of the image side of the eighth lens, the distance EP67 along the optical axis direction between the image side of the sixth spacer element and the object side of the seventh spacer element, the maximum thickness CP7 of the seventh spacer element along the optical axis direction, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 2.07 ≤ (R13 + R16) / (EP67 + CP7 + T78) ≤ 4.74; The combined focal length f78 of the seventh lens and the eighth lens, the refractive index N7 of the seventh lens, the refractive index N8 of the eighth lens, and the distance EP78 along the optical axis direction between the image side of the seventh spacer element and the object side of the eighth spacer element satisfy: -46.07 ≤ f78 × (N7 + N8) / EP78 ≤ -32.

41.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes: a first spacer element disposed on the image side of the first lens and at least partially contacting the image side of the first lens; wherein, The effective focal length f1 of the first lens and the inner diameter d1s of the object side of the first spacer element satisfy: 1.76 ≤ f1 / d1s ≤ 4.

14.

3. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes: a first spacer element disposed on the image side of the first lens and at least partially contacting the image side of the first lens; wherein, The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the inner diameter d1s of the object side of the first spacer element, and the outer diameter D1s of the object side of the first spacer element satisfy: 0 < R1 < R2 and 2.53 ≤ (R1 + R2) / (D1s - d1s) ≤ 2.and 2.53≤(R1 + R2) / (D1s - d1s)≤28.

02.

4. The optical imaging lens according to claim 1, characterized in that, The distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the dispersion coefficient V6 of the sixth lens, and the dispersion coefficient V7 of the seventh lens satisfy: 5.14≤EP67×(V6 / f6+V7 / f7)≤12.

16.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements also include: A third spacer element is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; A fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; and A fifth spacer element is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; wherein, The inner diameter d3m of the image side of the third spacer element, the inner diameter d4m of the image side of the fourth spacer element, the inner diameter d5m of the image side of the fifth spacer element, and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 1.84≤(d3m+d4m+d5m) / f345≤2.

35.

6. The optical imaging lens according to claim 1, characterized in that, The effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 0 <f6<|f5|。 7. The optical imaging lens according to any one of claims 1 to 4, 6, characterized in that, The plurality of spacer elements further includes: a fifth spacer element, disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; wherein, The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis, and the refractive index N5 of the fifth lens and the refractive index N6 of the sixth lens satisfy: -3.75≤(f5-f6) / [EP56×(N5+N6)]≤2.

95.

8. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements also include: A first spacer element is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; A second spacer element is positioned on the image side of the second lens and at least partially contacts the image side surface of the second lens; and A third spacer element is positioned on the image side of the third lens and at least partially contacts the image side surface of the third lens; wherein, The air gap T12 between the first lens and the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and the distance EP23 between the image side of the second spacer element and the object side of the third spacer element along the optical axis satisfy: 3.23≤(T12+CT2+T23+CT3) / |EP12-EP23|≤8.

42.

9. The optical imaging lens according to any one of claims 1 to 6, characterized in that, The radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, and the radius of curvature R16 of the image side of the eighth lens satisfy the following conditions: 0.54≤R14 / f≤2.00, -0.93≤R15 / f≤-0.75, and 0.69≤R16 / f≤1.

42.

10. The optical imaging lens according to any one of claims 1 to 6, characterized in that, The radius of curvature R14 of the image-side surface of the seventh lens, the radius of curvature R15 of the object-side surface of the eighth lens, the outer diameter D7m of the image-side surface of the seventh spacer element, and the outer diameter D8m of the image-side surface of the eighth spacer element satisfy the following: 10.72≤(R14-R15) / (D7m-D8m)≤44.

75.

11. The optical imaging lens according to claim 1, characterized in that, The height L of the lens barrel along the optical axis and the axial distance TD from the object side of the first lens to the image side of the eighth lens satisfy the following condition: 1.02 ≤ L / TD ≤ 1.

04.

12. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements also include: A fifth spacer element is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; wherein, The distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis, the distance EP67 between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis, the distance EP78 between the image-side surface of the seventh spacer element and the object-side surface of the eighth spacer element along the optical axis, and the axial distance TD between the object-side surface of the first lens and the image-side surface of the eighth lens satisfy: 0.36≤(EP56+EP67+EP78) / TD≤0.

50.

13. The optical imaging lens according to claim 1, characterized in that, The dispersion coefficient V8 of the eighth lens, the center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, the distance EP78 between the image side of the seventh spacer element and the object side of the eighth spacer element along the optical axis, and the effective focal length f8 of the eighth lens satisfy: -9.75≤V8×(CT7+CT8+EP78) / f8≤-5.

73.

14. The optical imaging lens according to any one of claims 1-6, characterized in that, The effective focal length f of the optical imaging lens, the maximum field of view FOV of the optical imaging lens, the outer diameter D0m of the image-side end face of the lens barrel and the inner diameter d0m of the image-side end face of the lens barrel satisfy: 5.65≤f×tan(FOV / 2) / (D0m-d0m)≤10.

33.

15. The optical imaging lens according to any one of claims 1 to 4, 6, characterized in that, The plurality of spacer elements also include: A fifth spacer element is positioned on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and A fifth auxiliary spacer element is positioned on the image side of the fifth spacer element and at least partially in contact with the fifth spacer element; wherein, The center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the air gap T56 of the fifth and sixth lenses on the optical axis, and the maximum thickness CP5b of the fifth auxiliary spacer element along the optical axis satisfy: 2.34≤(CT5+T56+CT6) / CP5b≤3.

18.

16. The optical imaging lens according to claim 15, characterized in that, The plurality of spacers also includes a fifth auxiliary spacer element disposed on the image side of the fifth auxiliary spacer element and in at least partial contact with the fifth auxiliary spacer element; wherein, The radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, the inner diameter d5bs of the object side of the fifth auxiliary spacer element, and the inner diameter d5cs of the object side of the fifth auxiliary spacer element satisfy: -2.37≤(R10-R11) / (d5bs+d5cs)≤-2.05.

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