Optical imaging lens

Abstract

The utility model relates to an optical imaging lens, which comprises a lens cone, an imaging lens group and a spacing element group, and the imaging lens group and the spacing element group are arranged in the lens cone. F3 / (CT3-EP23) lt; 37.75 DEG C and 20.0 DEG C; (EP45 + EP56) / T56lt; 21.80, 21.80, 21.80; wherein f3 is the effective focal length of the third lens, CT3 is the center thickness of the third lens, and EP23 is the spacing distance between the second spacing element and the third spacing element in the optical axis direction; eP45 is the spacing distance between the fourth spacing element and the fifth spacing element along the optical axis direction, EP56 is the spacing distance between the fifth spacing element and the sixth spacing element along the optical axis direction, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. According to the optical imaging lens, the high-quality imaging and ultrathin design of the lens are balanced, the compact structure of the system is ensured, and high-quality imaging is realized at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of imaging lens, especially optical imaging lens. BACKGROUND

[0002] In today's smart phone market, consumers' requirements for the shooting quality of mobile phones are increasing. With the development of mobile Internet, people rely more and more on mobile phones for image recording activities such as shooting and video recording, and put forward higher expectations for the clarity, color restoration and detail performance of mobile phone shooting quality.

[0003] However, when dealing with this growing demand, traditional mobile phone lenses inevitably face many serious challenges. On the one hand, in order to achieve high-quality imaging, complex optical structures and high-quality optical materials are usually required, which often leads to an increase in lens size. On the other hand, as a portable device, the internal space of a mobile phone is extremely limited, and many functional modules need to be integrated in a limited space, leaving very little space for the lens.

[0004] In the prior art, a Chinese utility model patent with publication number "CN218068418U" discloses an optical imaging lens, which includes an imaging lens group comprising 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 in order along the optical axis from the object side to the image side. Although it also relates to mobile phone lens technology, it still has the following problems:

[0005] (1) It is difficult to achieve a perfect balance between high-quality imaging and ultra-thin design of the lens;

[0006] (2) The imaging system is affected by shallow depth of field, lens tilt or offset, and air gap, resulting in poor imaging quality.

[0007] Therefore, it is still a problem to be solved to design a mobile phone lens with high-quality imaging capability and ultra-thin design. UTILITY MODEL CONTENT

[0008] To solve the above problems in the prior art, the purpose of the utility model is to provide an optical imaging lens that balances high-quality imaging and ultra-thin design of the lens, ensuring compact system structure while achieving high-quality imaging.

[0009] To achieve the above utility model purpose, the utility model provides an optical imaging lens, which includes a lens barrel, an imaging lens group and a spacer element group placed in the lens barrel,

[0010] The imaging lens group comprises, along an optical axis from an object side to an image side, in order: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with refractive power, a sixth lens with positive refractive power, a seventh lens with negative refractive power, and an eighth lens with negative refractive power.

[0011] The spacer element group comprises a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element located on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens.

[0012] The optical imaging lens satisfies: 32.85 < f3 / (CT3-EP23) < 37.75 and 20.0 < (EP45+EP56) / T56 < 21.80.

[0013] Wherein, f3 is the effective focal length of the third lens, CT3 is the center thickness of the third lens, EP23 is the interval distance between the second spacer element and the third spacer element along the optical axis direction; EP45 is the interval distance between the fourth spacer element and the fifth spacer element along the optical axis direction, EP56 is the interval distance between the fifth spacer element and the sixth spacer element along the optical axis direction, and T56 is the air gap between the fifth lens and the sixth lens along the optical axis.

[0014] According to one of the technical solutions of the utility model, the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface is a concave surface; and the object side surface of the eighth lens is a concave surface, and the image side surface is a concave surface.

[0015] According to one of the technical solutions of the utility model, the spacer element further comprises a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens.

[0016] The optical imaging lens satisfies: 6.45 mm < f1 / (CT1 / EP01) < 7.05 mm.

[0017] Wherein, f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens, and EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis direction.

[0018] According to one of the technical schemes of the utility model, the interval element group further includes a seventh interval element located on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens;

[0019] The optical imaging lens satisfies: 21.65 < (EP56+EP67) / T67 < 25.65.

[0020] Wherein, EP56 is the interval distance of the fifth interval element and the sixth interval element along the optical axis direction, EP67 is the interval distance of the sixth interval element and the seventh interval element along the optical axis direction, and T67 is the air gap of the sixth lens and the seventh lens on the optical axis.

[0021] According to one of the technical schemes of the utility model, the object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface.

[0022] The optical imaging lens satisfies: 2.54 < f56 / (d7s-d4m) < 3.50.

[0023] Wherein, f56 is the combined focal length of the fifth lens and the sixth lens, d7s is the inner diameter of the object side surface of the seventh interval element, and d4m is the inner diameter of the image side surface of the fourth interval element.

[0024] According to one of the technical schemes of the utility model, the optical imaging lens satisfies: -2.15mm < D7m / (f8 / |SAG82|) < -1.50mm.

[0025] Wherein, D7m is the outer diameter of the image side surface of the seventh interval element, f8 is the effective focal length of the eighth lens, and SAG82 is the distance on the optical axis between the intersection point of the image side surface of the eighth lens on the optical axis and the effective radius vertex of the image side surface of the eighth lens.

[0026] According to one of the technical schemes of the utility model, the optical imaging lens satisfies: 1.70 < EP70 / |SAG82| < 2.30.

[0027] Wherein, EP70 is the distance along the optical axis direction from the image side surface of the seventh interval element to the image side end surface of the lens barrel, and SAG82 is the distance on the optical axis between the intersection point of the image side surface of the eighth lens on the optical axis and the effective radius vertex of the image side surface of the eighth lens.

[0028] According to one of the technical schemes of the utility model, the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface.

[0029] The optical imaging lens satisfies: 2.00<=R7 / R8+EP34 / CT4<=2.30.

[0030] Wherein, R7 is the curvature radius of the object side of the fourth lens, R8 is the curvature radius of the image side of the fourth lens, EP34 is the interval distance of the third interval element and the fourth interval element along the optical axis direction, and CT4 is the center thickness of the fourth lens.

[0031] According to one of the technical solutions of the utility model, the optical imaging lens satisfies: 4.10<d4s / (CT4*N4)<5.05.

[0032] Wherein, d4s is the inner diameter of the object side of the fourth interval element, CT4 is the center thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

[0033] According to one of the technical solutions of the utility model, the optical imaging lens satisfies: 0.45<=f*tan(Semi-FOV) / d0m<=0.48.

[0034] Wherein, f is the effective focal length of the optical imaging lens, Semi-FOV is half of the maximum field angle of the optical imaging lens, and d0m is the inner diameter of the image side end surface of the lens barrel.

[0035] According to one of the technical solutions of the utility model, the optical imaging lens satisfies: 1.40<f56 / f<1.85 and 1.55<EP56 / CT6*N6<2.30.

[0036] Wherein, f56 is the combined focal length of the fifth lens and the sixth lens, f is the effective focal length of the optical imaging lens, EP56 is the interval distance of the fifth interval element and the sixth interval element along the optical axis direction, CT6 is the center thickness of the sixth lens, and N6 is the refractive index of the sixth lens.

[0037] According to one of the technical solutions of the utility model, the optical imaging lens satisfies: 1.40<R8 / R7*N4<2.25 and 1.05<=(D4m-d3s) / d3m<1.20.

[0038] Wherein, R8 is the curvature radius of the image side of the fourth lens, R7 is the curvature radius of the object side of the fourth lens, N4 is the refractive index of the fourth lens, D4m is the outer diameter of the image side of the fourth interval element, d3s is the inner diameter of the object side of the third interval element, and d3m is the inner diameter of the image side of the third interval element.

[0039] According to one of the technical solutions of the utility model, the object side of the third lens is a convex surface, and the image side is a convex surface.

[0040] The optical imaging lens satisfies: 10.45<(T34 / CP3) / (R6 / R7)<14.55 and 0.65<(D3m-d2m) / d3s<1.16;

[0041] Wherein, T34 is the air gap of the third lens and the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer element, R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, D3m is the outer diameter of the image side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and d3s is the inner diameter of the object side surface of the third spacer element.

[0042] According to one of the technical solutions of the utility model, the optical imaging lens satisfies: 1.50<CT3 / CT4+EP23 / EP34<2.00;

[0043] Wherein, CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, EP23 is the interval distance of the second spacer element and the third spacer element along the optical axis, and EP34 is the interval distance of the third spacer element and the fourth spacer element along the optical axis.

[0044] The utility model discloses the beneficial effect:

[0045] The optical imaging lens of the application uses eight lenses with optical power, the first lens to the eighth lens are arranged and spaced in sequence, which satisfies the relationship "32.85<f3 / (CT3-EP23)<37.75", which makes the system depth of field shallow, and the shallow depth of field can cause the imaging quality to decrease to a certain extent, especially in the edge area of the depth of field. By controlling the interval distance of the air gap between the fourth spacer element and the fifth spacer element, the air gap between the fifth spacer element and the sixth spacer element, and the space gap between the fifth lens and the sixth lens within a certain range, the relationship between the thickness of the structure area of the fifth lens and the sixth lens and the air gap can be constrained, a fifth spacer element with a reasonable thickness is arranged in the air gap between the fifth lens and the sixth lens, thereby ensuring the reasonable thickness of the structure area of the fifth lens and the sixth lens, which is conducive to the stability of the support between the fifth lens and the sixth lens at the rear end after the lens assembly is supported, reduces the influence of lens tilting or deviation on the air gap, and ensures the air gap between the fifth lens and the sixth lens, which can effectively solve the problems of optical distortion, chromatic aberration, and reduced resolution, thereby ensuring the definition and detail performance of the image while maintaining a wide-angle field of view and a shallow depth of field, and meeting the requirements of high-quality imaging. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed in the embodiments will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0047] Figure 1A A structural arrangement drawing and a schematic diagram of part parameters of an optical imaging lens according to the present application are shown.

[0048] Figure 1B A structural schematic diagram of an effective diameter of an eighth lens of an optical imaging lens according to the present application and a schematic diagram of part parameters are shown.

[0049] Figure 2A , Figure 2B and Figure 2C Structural schematic diagrams of three optical imaging lenses according to the first embodiment of the present application are shown.

[0050] Figures 3A-3D Axial chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves of the optical imaging lenses according to the first embodiment of the present application are shown respectively.

[0051] Figure 4A , Figure 4B and Figure 4C Structural schematic diagrams of three optical imaging lenses according to the second embodiment of the present application are shown.

[0052] Figures 5A-5D Axial chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves of the optical imaging lenses according to the second embodiment of the present application are shown respectively.

[0053] Figure 6A , Figure 6B and Figure 6C Structural schematic diagrams of three optical imaging lenses according to the third embodiment of the present application are shown.

[0054] Figures 7A-7D Axial chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves of the optical imaging lenses according to the third embodiment of the present application are shown respectively.

[0055] Figure 8 A diffraction modulation transfer function diagram of an optical lens is shown.

[0056] Figure 9 A diffraction modulation transfer function diagram of another optical lens is shown.

[0057] Figure 10The diffraction modulation transfer function diagram of the optical imaging lens in the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0058] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of illustrative embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the description, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0059] It should be noted that in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the first lens without departing from the teachings of the present application.

[0060] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0061] In this context, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens.

[0062] It should also be understood that the words "comprise", "comprising", "has", "having", "include" and / or "including", 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 groups thereof. In addition, when expressions such as "at least one of" appear after the words "comprise", "comprising", "has", "having", "include" and / or "including", they modify the phrase consisting of the listed items, rather than the individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" indicates that "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0063] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0064] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The following embodiments only express several implementation manners of the present application, which are described in detail and specifically, but should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are within the protection scope of the present application.

[0065] As shown in Figure 1A and Figure 1B The optical imaging lens group of the exemplary embodiment of the present application comprises eight lenses, which comprises, in order 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 each lens is independent of each other, and each lens has an air gap on the optical axis.

[0066] The spacer element group comprises at least a first spacer element to a seventh spacer element;

[0067] The imaging lens group and the spacer element group are accommodated in a lens barrel, the lens barrel comprises an object side end face, an image side end face, an outer ring face and an inner ring face, and the inner ring face of the lens barrel is in a stepped shape along the optical axis direction of the optical imaging lens.

[0068] In some embodiments of the present application, the first lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface, which helps to reduce light scattering and chromatic aberration.

[0069] In some embodiments of the present application, the second lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface, which helps to further correct chromatic aberration and spherical aberration, and also helps to adjust the focal length.

[0070] In some embodiments of the present application, the third lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface, which can focus light, and helps to adjust the light focusing point to achieve better imaging quality and depth of field control.

[0071] In some embodiments of the present application, the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface, which helps to further focus light and adjust the light incidence angle to reduce aberration and improve image clarity.

[0072] In some embodiments of the present application, the object side of the fifth lens is concave, and the image side is convex, for adjusting the distribution of light rays to reduce optical distortion.

[0073] In some embodiments of the present application, the sixth lens has positive focal power, the object side is concave, and the image side is convex, for further adjusting the distribution and focusing of light rays to optimize image quality.

[0074] In some embodiments of the present application, the seventh lens has negative focal power, the object side is convex, and the image side is concave, for adjusting the final focusing of light rays to ensure the sharpness and acuity of the image on the sensor.

[0075] In some embodiments of the present application, the eighth lens has negative focal power, the object side is concave, and the image side is concave, for the final stage of light adjustment to ensure that the light rays are evenly distributed on the sensor, reduce the loss of edge light, and improve the overall brightness and uniformity of the image.

[0076] By reasonably distributing the focal power of each lens and the combination of convex and concave surfaces, on the one hand, chromatic aberration and spherical aberration can be effectively reduced, and the color accuracy and sharpness of the image can be improved; on the other hand, the focal length and depth of field can be controlled to achieve a good background blur effect; at the same time, the distribution of light rays is optimized, optical distortion is reduced, and the uniformity and brightness of the image are improved; in addition, the sharpness, contrast and color saturation of the image are also improved, achieving high-quality imaging effect.

[0077] In some embodiments of the present application, the optical imaging lens can further include a color filter for correcting color deviation and / or a protective glass for protecting the photosensitive elements located on the imaging surface.

[0078] In some embodiments of the present application, the optical imaging lens satisfies: 32.85<f3 / (CT3-EP23)<37.75 and 20.0<(EP45+EP56) / T56<21.80; wherein f3 is the effective focal length of the third lens, CT3 is the center thickness of the third lens, EP23 is the interval distance of the second interval element and the third interval element along the optical axis; EP45 is the interval distance of the fourth interval element and the fifth interval element along the optical axis, EP56 is the interval distance of the fifth interval element and the sixth interval element along the optical axis, and T56 is the air gap of the fifth lens and the sixth lens along the optical axis.

[0079] By controlling the proportional relationship between the effective focal length, the center thickness of the third lens and the air spacing distance between the second spacing element and the third spacing element within a reasonable range, the loss and interference of light can be reduced, the light utilization rate can be improved, and the system depth of field can be made shallow, which is beneficial to the virtualization of the imaging background. However, the shallow depth of field will cause a certain degree of decline in imaging quality, especially in the edge area of the depth of field. In this regard, by controlling the spacing distance between the air spacing of the fourth spacing element and the fifth spacing element and the air spacing of the fifth spacing element and the sixth spacing element and the space gap between the fifth lens and the sixth lens within a certain range, the relationship between the thickness of the structure area of the fifth lens and the sixth lens and the air gap can be constrained, the fifth spacing element with a reasonable thickness is arranged between the fifth lens and the sixth lens, and then the reasonable thickness of the structure area of the fifth lens and the sixth lens is ensured, which is beneficial to the stability of the support between the fifth lens and the sixth lens located at the rear end, reduces the influence of lens tilt or deviation on the air gap, ensures the air gap between the fifth lens and the sixth lens, and effectively solves the problems of optical distortion, chromatic aberration and reduced resolution, so that the image clarity and detail performance are ensured while the wide-angle field of view and shallow depth of field are maintained, and the requirements of high-quality imaging are met.

[0080] For example, when f3 / (CT3-EP23)=36.14, the above relationship is satisfied, at this time, (EP45+EP56) / T56 is set to 18.27, which is below the lower limit of the range, as shown in Table 1, the 0.8F, 1.0F field curvature offset, and the imaging blur; (EP45+EP56) / T56 is set to 27.41, which is above the upper limit of the range, as shown in Table 1, the 0.8F, 1.0F field curvature offset, and the imaging distortion; (EP45+EP56) / T56 is set to 21.79, which satisfies the above relationship, as shown in Table 1, the field curvature is concentrated, the peak value is high, the aberration is small, and the imaging is clear. Figure 8 Figure 9 Figure 10

[0081] In some embodiments of the utility model, the optical imaging lens satisfies: 6.45mm < f1 / (CT1 / EP01) < 7.05mm; wherein, f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens, and EP01 is the distance between the object side end surface of the lens barrel and the object side surface of the first spacing element along the optical axis direction.

[0082] ​​​By controlling the ratio of the effective focal length of the first lens to the ratio of the center thickness and the distance of the spacing element, the thickness of the structural region of the first lens is constrained while ensuring that the object side end surface of the lens barrel has sufficient wall thickness, the thickness ratio of the first lens is ensured, the relatively short focal length of the first lens is beneficial to the balance of the focal length of the system and the optical performance, the aberrations such as chromatic aberration and spherical aberration can be effectively controlled, and the optimization of the depth of field is realized, so that the imaging subject is more prominent and the background is soft and blurred.

[0083] In some embodiments of the present application, the optical imaging lens satisfies: 21.65<(EP56+EP67) / T67<25.65; wherein EP56 is the spacing distance of the fifth spacing element and the sixth spacing element along the optical axis direction, EP67 is the spacing distance of the sixth spacing element and the seventh spacing element along the optical axis direction, and T67 is the air gap of the sixth lens and the seventh lens on the optical axis.

[0084] By controlling the proportional relationship of the spacing distance between the fifth spacing element and the sixth spacing element, the spacing distance between the sixth spacing element and the seventh spacing element, and the space gap between the fifth lens and the sixth lens, the thickness of the structural region of the sixth lens and the seventh lens is constrained, and the air gap between the two lenses is light, so that the two lenses have a reasonable structural region thickness, which is beneficial to the stable support of the lens during assembly, reduces the tilt and deviation of the lens after assembly, reduces the influence on the air gap, better reduces chromatic aberration and distortion, improves the clarity and color accuracy of imaging, and also maintains the performance stability of the system under different temperature conditions, and realizes more stable optical performance.

[0085] In some embodiments of the present application, the optical imaging lens satisfies: 2.54<f56 / (d7s-d4m)<3.50; wherein f56 is the combined focal length of the fifth lens and the sixth lens, d7s is the inner diameter of the object side surface of the seventh spacing element, and d4m is the inner diameter of the image side surface of the fourth spacing element.

[0086] By controlling the proportional relationship of the combined focal length of the fifth lens and the sixth lens and the inner diameter of the object side surface of the seventh spacing element and the inner diameter of the image side surface of the fourth spacing element, the relationship between the focal length of the lens and the internal structure size is controlled, the inner diameter of the spacing element determines the aperture through which the light passes, and a reasonable aperture can block the excess light generated at the edge after refraction by the fifth lens and the sixth lens, thereby reducing the risk of stray light.

[0087] In some embodiments of the present application, the optical imaging lens satisfies: -2.15mm<D7m / (f8 / |SAG82|)<-1.50mm; wherein D7m is the outer diameter of the image side surface of the seventh spacing element, f8 is the effective focal length of the eighth lens, and SAG82 is the distance on the optical axis between the intersection of the image side surface of the eighth lens on the optical axis and the effective radius vertex of the image side surface of the eighth lens.

[0088] The seventh interval element image side outer diameter and the eighth lens outer diameter are located at the same inner diameter level in the interior of the lens barrel, and by controlling the ratio relationship between the outer diameter of the image side surface of the seventh interval element and the effective focal length and the back sag of the eighth lens, the outer diameter and shape of the eighth lens can be constrained, the utilization rate of light is improved, more light can effectively participate in imaging, and the light can be accurately focused on the imaging surface, imaging blur and distortion are reduced, and the image details are more clear and identifiable.

[0089] In some embodiments of the utility model, the optical imaging lens satisfies: 1.70 < EP70 / |SAG82| < 2.30; wherein, EP70 is the distance of the image side surface of the seventh interval element to the image side end surface of the lens barrel along the optical axis direction, and SAG82 is the distance between the intersection of the image side surface of the eighth lens on the optical axis and the effective radius vertex of the image side surface of the eighth lens on the optical axis.

[0090] By controlling the ratio relationship between the distance of the image side surface of the seventh interval element to the image side end surface of the lens barrel and the back sag of the eighth lens, the edge thickness and the image side curvature of the eighth lens are controlled, which is beneficial to the image side surface of the eighth lens not to exceed the lens barrel to generate friction and facilitate the matching with the module later.

[0091] In some embodiments of the utility model, the optical imaging lens satisfies: 2.00 ≤ R7 / R8 + EP34 / CT4 ≤ 2.30; wherein, R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, EP34 is the interval distance of the third interval element and the fourth interval element along the optical axis direction, and CT4 is the center thickness of the fourth lens.

[0092] By controlling the relationship between the curvature radius of the object side surface, the curvature radius of the image side surface, the interval distance of the fourth interval element and the fifth interval element, and the center thickness of the fourth lens, EP34 can constrain the thickness of the fourth lens structure area, and the ratio relationship of EP34 / CT4 can constrain the thickness ratio of the fourth lens structure area and the center, which effectively constrains the overall shape of the fourth lens in combination with the limitation of the curvature radius, reduces the imaging difficulty, effectively reduces the dispersion of light passing through the lens, improves the gathering accuracy of light of different wavelengths, and reduces the dispersion and spherical aberration.

[0093] In some embodiments of the utility model, the optical imaging lens satisfies: 4.10 < d4s / (CT4*N4) < 5.05; wherein, d4s is the inner diameter of the object side surface of the fourth interval element, CT4 is the center thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

[0094] By controlling the proportional relationship of the inner diameter of the object side surface of the fourth spacing element, the fourth lens center thickness and the fourth lens refractive index, the accuracy of the light rays propagating between the lens and the spacing element can be ensured, which helps to optimize the reduction of the lens optical distortion and the focusing difference of light rays of different wavelengths in the lens, thereby improving the system chromatic aberration and improving the overall optical performance.

[0095] In some embodiments of the present application, the optical imaging lens satisfies: 0.45<=f*tan(Semi-FOV) / d0m<=0.48; wherein f is the effective focal length of the optical imaging lens, Semi-FOV is half of the maximum field of view angle of the optical imaging lens, and d0m is the inner diameter of the image side end surface of the lens barrel.

[0096] By controlling the proportional relationship of the effective focal length, the maximum half field of view angle and the inner diameter of the image side end surface of the lens barrel, the field of view angle and the focal length of the lens can be optimized, the image coverage range can be improved, and the lens distortion can be controlled to maintain the authenticity and accuracy of the image.

[0097] In some embodiments of the present application, the optical imaging lens satisfies: 1.40<f56 / f<1.85 and 1.55<EP56 / CT6*N6<2.30; wherein f56 is the combined focal length of the fifth lens and the sixth lens, f is the effective focal length of the optical imaging lens, EP56 is the spacing distance of the fifth spacing element and the sixth spacing element along the optical axis direction, CT6 is the center thickness of the sixth lens, and N6 is the refractive index of the sixth lens.

[0098] By controlling the proportional relationship between the combined focal length of the fifth lens and the sixth lens and the focal length of the lens, the focal length of the entire lens system can meet the design requirements, which helps to ensure the imaging performance of the lens; and by controlling the proportional relationship of the spacing distance of the fifth spacing element and the sixth spacing element, the center thickness and the refractive index of the sixth lens, the thickness ratio and the refractive index of the sixth lens can be constrained, the light path through the sixth lens can be optimized, the reflection of light in the sixth lens structure area can be reduced, and the risk of internal reflection stray light can be reduced.

[0099] In some embodiments of the present application, the optical imaging lens satisfies: 1.40<R8 / R7*N4<2.25 and 1.05<=(D4m-d3s) / d3m<1.20; wherein R8 is the radius of curvature of the image side surface of the fourth lens, R7 is the radius of curvature of the object side surface of the fourth lens, N4 is the refractive index of the fourth lens, D4m is the outer diameter of the image side surface of the fourth spacing element, d3s is the inner diameter of the object side surface of the third spacing element, and d3m is the inner diameter of the image side surface of the third spacing element.

[0100] By controlling the curvature radius and the refractive index of the object side surface and the image side surface of the fourth lens, the improvement of spherical aberration and chromatic aberration is facilitated, the definition of imaging and the accuracy of color can be improved; meanwhile, by controlling the outer diameter of the image side surface of the fourth spacer element, the inner diameter of the object side surface of the third spacer element and the inner diameter of the image side surface, the propagation path of light in the lens is controlled, the loss and scattering of light are reduced, and the brightness and contrast of imaging are improved.

[0101] In some embodiments of the present application, the optical imaging lens satisfies: 10.45<(T34 / CP3) / (R6 / R7)<14.55 and 0.65<(D3m-d2m) / d3s<1.16; wherein T34 is the air gap of the third lens and the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer element, R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, D3m is the outer diameter of the image side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and d3s is the inner diameter of the object side surface of the third spacer element.

[0102] By controlling the air gap of the third lens and the fourth lens on the optical axis, the maximum thickness of the third spacer element, and the proportional relationship of the curvature radius of the image side surface of the third lens and the curvature radius of the object side surface of the fourth lens, the light deviation and energy loss can be reduced, the utilization rate of light can be improved, more light can be accurately focused on the imaging surface, thereby enhancing the brightness and contrast of imaging, and the definition and accuracy of imaging can be improved. For the micro details and edge parts in the image, a more sharp effect can be presented, and the imaging quality can be improved. At the same time, by controlling the difference between the outer diameter of the image side surface of the third spacer element and the inner diameter of the image side surface of the second spacer element, and the ratio of the inner diameter of the object side surface of the third spacer element, the transmission of light in the lens is facilitated, the loss and scattering of light are reduced, and the imaging performance is further improved.

[0103] In some embodiments of the present application, the optical imaging lens satisfies: 1.50<CT3 / CT4+EP23 / EP34<2.00; wherein CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, EP23 is the interval distance of the second spacer element and the third spacer element along the optical axis, and EP34 is the interval distance of the third spacer element and the fourth spacer element along the optical axis.

[0104] By controlling the ratio of the center thickness of the third lens and the fourth lens and the ratio of the interval distance of the second and third spacer elements and the interval distance of the third and fourth spacer elements, the ratio of the center thickness of the third lens and the fourth lens and the edge thickness ratio can be realized, and then the focal length and the field angle of the lens are finely adjusted by the two lenses, the improvement of spherical aberration and chromatic aberration is realized, the aberration caused by optical distortion is reduced, and a clearer and more real image is obtained.

[0105] 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 optical 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.

[0106] In some embodiments of this invention, the lens material in the optical imaging lens provided by this invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Conversely, when the lens material is glass, the low dispersion characteristic of glass itself can effectively correct geometric chromatic aberration of the optical system. The optical lens provided by this invention can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

[0107] In some embodiments of this invention, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens can be spherical lenses or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens of this invention can all be aspherical lenses, which can effectively reduce optical lens aberrations, thereby reducing the number of lenses and their size, and achieving lens miniaturization.

[0108] When an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equation:

[0109]

[0110] In the above formula, z is the axial distance from the vertex to the surface at a position perpendicular to the optical axis at a height y; c represents the curvature at the vertex of the aspherical surface; k is the conic coefficient; A4, A6, A8, A 10 A 12 A 14 A 16represents the aspherical surface coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, etc.

[0111] The utility model will be further described in the following multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different, and the specific differences can be seen from the parameter table of each embodiment. The following embodiments are only preferred embodiments of the utility model, but the embodiments of the utility model are not limited to the following embodiments, and any change, replacement, combination or simplification made without departing from the innovative points of the utility model should be regarded as equivalent replacement mode and included in the protection scope of the utility model.

[0112] Embodiment one

[0113] The following refers to Figures 2A-3D The optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 according to embodiment one of the present application are described. Figure 2A 、 Figure 2B and Figure 2C The structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 according to embodiment one of the present application are shown respectively.

[0114] As shown in Figure 2A 、 Figure 2B and Figure 2C The structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 all include a lens barrel structure P0, imaging lens groups E1-E8 and multiple spacer elements P1-P8.

[0115] In the embodiment one, the structural schematic diagram of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 adopts the same imaging lens group, which sequentially comprises, from the object side to the image side: 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. Wherein, the first lens E1 has positive refractive power, the object side surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 thereof is a convex surface, and the image side surface S6 thereof is a convex surface. The fourth lens E4 has negative refractive power, the object side surface S7 thereof is a concave surface, and the image side surface S8 thereof is a convex surface. The fifth lens E5 has positive refractive power, the object side surface S9 thereof is a concave surface, and the image side surface S10 thereof is a convex surface. The sixth lens E6 has positive refractive power, the object side surface S11 thereof is a concave surface, and the image side surface S12 thereof is a convex surface. The seventh lens E7 has negative refractive power, the object side surface S13 thereof is a convex surface, and the image side surface S14 thereof is a concave surface. The eighth lens E8 has negative refractive power, the object side surface S15 thereof is a concave surface, and the image side surface S16 thereof is a concave surface. The light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface (not shown).

[0116] Table 1 lists the related parameters of each lens in the optical imaging lens of the embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd of material, Abbe number Vd and conic coefficient.

[0117]

[0118]

[0119] Table 1

[0120] Table 2 lists the aspheric coefficients of each aspheric lens in the zoom lens of the embodiment, including: A4, A6, A8, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0121]

[0122]

[0123] Table 2

[0124] As Figure 2A , Figure 2B and Figure 2CAs shown, the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 each includes eight spacer elements, which are the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, the sixth spacer element P6, the seventh spacer element P7 and the eighth spacer element P8 respectively. The first spacer element P1 is arranged between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, the second spacer element P2 is arranged between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, the third spacer element P3 is arranged between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, the fourth spacer element P4 is arranged between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, the fifth spacer element P5 is arranged between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5, the sixth spacer element P6 is arranged between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6, the seventh spacer element P7 is arranged between the seventh lens E7 and the eighth lens E8 and in contact with the image side surface of the seventh lens E7, and the eighth spacer element P8 is in contact with the image side surface of the eighth lens E8. In this embodiment, the first spacer element P1 to the seventh spacer element P7 are spacers, and the eighth spacer element P8 is a spacer ring or a press ring. The above spacer elements P1-P8 can block the entry of external stray light, make the lens and the lens barrel better abut, and enhance the structural stability of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003.

[0125] The optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 can differ in the size of the spacer elements, the lens non-effective diameter area and the lens barrel structure parameters. Table 3 shows the basic parameter table of the spacer elements and the lens barrel of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment One. As an example, the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 each have one lens barrel P0.

[0126] Example One Parameters Optical imaging lens 1001 Optical imaging lens 10012 Optical imaging lens 10013 d2m 2.394 2.392 2.395 d3s 2.640 2.641 2.635 d3m 2.640 2.641 2.635 D3m 5.180 4.498 5.430 d4s 3.253 3.367 3.279 d4m 3.253 3.367 3.279 D4m 5.460 5.500 5.407 d7s 5.880 5.880 5.913 D7m 7.920 7.920 7.890 d0m 8.947 8.947 8.947 EP01 0.803 0.756 0.788 EP23 0.295 0.295 0.280 CP3 0.022 0.022 0.022 EP34 0.569 0.627 0.599 EP45 0.514 0.433 0.462 EP56 0.583 0.583 0.598 EP67 0.598 0.598 0.613 EP70 2.050 2.050 2.035

[0127] Table 3

[0128] Figure 3A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment One is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the lens. Figure 3B The astigmatism curve of the optical imaging lens of Embodiment One is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 3C The distortion curve of the optical imaging lens of Embodiment One is shown, which represents the distortion size values corresponding to different image heights. Figure 3DThe magnification chromatic aberration curve of the optical imaging lens of embodiment one is shown, which represents the deviation of different image heights of light rays after passing through the lens on the imaging plane. According to Figures 3A-3D It can be known that the optical imaging lens given by embodiment one can achieve good imaging quality.

[0129] Embodiment two

[0130] The following refers to Figures 4A-5D The optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 according to embodiment two of the present application are described. Figure 4A 、 Figure 4B and Figure 4C The structural schematic diagrams of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 according to embodiment two of the present application are shown respectively.

[0131] As shown in Figure 4A 、 Figure 4B and Figure 4C The structural schematic diagrams of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 all include a lens barrel structure P0, imaging lens groups E1-E8 and a plurality of spacer elements P1-P8.

[0132] In embodiment two, the structural schematic diagrams of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 adopt the same imaging lens group, which includes in order from the object side to the image side: 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. Among them, the first lens E1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has negative refractive power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface. The fifth lens E5 has positive refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The sixth lens E6 has positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface. The seventh lens E7 has negative refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface. The eighth lens E8 has negative refractive power, the object side surface S15 is a concave surface, and the image side surface S16 is a concave surface. Light from the object passes through each surface S1 to S16 in order and is finally imaged on the imaging plane (not shown).

[0133] Table 4 lists the related parameters of each lens in the optical imaging lens of the present embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd of the material, Abbe number Vd and conic constant.

[0134]

[0135]

[0136] Table 4

[0137] Table 5 lists the aspherical coefficients of each aspherical lens of the zoom lens of the present embodiment, including: A4, A6, A8, A10, A12, A14, A16, and A18. 10 12 14 16 18 20 .

[0138] Face No. [A4] [A6] [A8] A 10 ]]> A 12 ]]> A 14 ]]> A 16 ]]> S1 -6.99E-04 1.45E-02 -2.46E-02 2.45E-02 -1.15E-02 1.25E-04 2.32E-03 S2 -1.05E-02 5.29E-03 -4.71E-03 1.16E-03 4.38E-04 -1.49E-04 -5.04E-04 S3 -8.01E-02 2.64E-02 1.04E-02 -1.88E-02 9.51E-03 3.72E-03 -6.86E-03 S4 -8.18E-02 2.58E-02 4.05E-03 -5.28E-03 3.82E-04 2.17E-03 -6.11E-04 S5 -2.43E-02 -2.03E-02 6.04E-03 -3.02E-03 -4.37E-03 3.85E-03 8.71E-04 S6 -3.85E-02 -5.68E-03 -1.39E-02 1.20E-02 -5.76E-03 1.39E-03 4.87E-04 S7 -7.81E-02 -1.68E-02 1.30E-02 -1.84E-02 1.33E-02 -1.65E-03 -1.72E-03 S8 -5.81E-02 -8.07E-03 1.90E-03 1.59E-03 -1.59E-04 -2.14E-04 -9.53E-06 S9 -1.22E-02 7.30E-03 6.78E-03 -6.08E-04 -2.11E-03 4.54E-04 2.79E-04 S10 -1.40E-02 1.32E-02 1.33E-03 -1.21E-03 1.09E-04 -3.35E-06 -8.26E-06 S11 5.38E-02 -1.19E-02 -4.77E-03 2.79E-03 -9.77E-04 2.44E-04 -2.21E-05 S12 7.18E-02 -1.27E-02 -2.30E-03 4.38E-04 6.50E-05 4.92E-06 -4.34E-06 S13 -5.02E-02 2.43E-03 -1.08E-03 3.23E-04 -1.09E-04 -3.55E-06 4.10E-06 S14 -5.50E-02 3.72E-03 1.07E-05 -1.36E-04 1.48E-05 1.33E-06 -1.71E-07 S15 -4.08E-02 -2.29E-03 2.72E-03 -3.57E-04 1.60E-05 -5.17E-07 5.54E-08 S16 -5.64E-02 8.39E-03 -8.58E-04 5.25E-05 6.69E-08 -2.96E-07 9.82E-09 Face No. A 18 ]]> A 20 ]]> S1 -9.37E-04 1.15E-04 S2 3.28E-04 -5.77E-05 S3 3.17E-03 -5.01E-04 S4 -4.57E-04 2.22E-04 S5 -2.01E-03 5.78E-04 S6 -5.46E-04 1.18E-04 S7 4.10E-04 2.46E-05 S8 2.89E-05 -2.55E-06 S9 -1.13E-04 1.11E-05 S10 6.09E-06 -6.88E-07 S11 -5.42E-06 1.02E-06 S12 3.76E-07 -1.02E-08 S13 5.58E-07 -1.35E-07 S14 -4.47E-09 4.26E-10 S15 -1.12E-11 -2.00E-10 S16 9.53E-10 -5.28E-11

[0139] Table 5

[0140] As shown in Figure 4A , Figure 4B and Figure 4C , the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 each includes eight spacer elements, which are the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, the sixth spacer element P6, the seventh spacer element P7 and the eighth spacer element P8, respectively. Since the positions of the above eight spacer elements are the same as those of the spacer elements of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of Embodiment One, no further description is provided herein.

[0141] The optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 can differ in the size of the spacer elements, the non-effective diameter region of the lens, and the barrel structure parameters. Table 6 shows the basic parameter table of the spacer elements and the barrel of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of Embodiment Two. As an example, the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 each has one barrel P0.

[0142] Example Two Parameters Optical imaging lens 2001 Optical imaging lens 20012 Optical imaging lens 2003 d2m 2.622 2.623 2.625 d3s 2.844 2.842 2.842 d3m 2.844 2.842 2.842 D3m 5.690 4.754 5.740 d4s 3.470 3.469 3.449 d4m 3.470 3.469 3.449 D4m 6.066 6.086 6.116 d7s 5.879 5.882 5.882 D7m 8.578 8.559 8.528 d0m 9.397 9.397 9.397 EP01 0.746 0.745 0.766 EP23 0.321 0.320 0.306 CP3 0.022 0.022 0.022 EP34 0.542 0.545 0.542 EP45 0.638 0.635 0.633 EP56 0.471 0.470 0.491 EP67 0.636 0.640 0.636 EP70 1.942 1.940 1.942

[0143] Table 6

[0144] Figure 5A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment Two is shown, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Figure 5B The astigmatism curve of the optical imaging lens of Embodiment Two is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 5C The distortion curve of the optical imaging lens of Embodiment Two is shown, which represents the distortion size values corresponding to different image heights. Figure 5D ​​​​​The magnification chromatic aberration curve of the optical imaging lens of Embodiment Two is shown, which represents the deviation of different image heights of light rays after passing through the lens on the imaging plane. According to Figures 5A-5D It can be known that the optical imaging lens given by Embodiment Two can achieve good imaging quality.

[0145] Embodiment Three

[0146] The following refers to Figures 6A-7D The optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 according to Embodiment Three of the present application are described. Figure 6A 、 Figure 6B and Figure 6C The structural schematic diagrams of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 according to Embodiment Three of the present application are shown respectively.

[0147] As shown in Figure 6A 、 Figure 6B and Figure 6C , the structural schematic diagrams of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 all include a lens barrel structure P0, imaging lens groups E1-E8 and a plurality of spacer elements P1-P8.

[0148] In Embodiment Three, the structural schematic diagrams of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 adopt the same imaging lens group, which includes in order from the object side to the image side: 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. Among them, the first lens E1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has positive refractive power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface. The fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The sixth lens E6 has positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface. The seventh lens E7 has negative refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface. The eighth lens E8 has negative refractive power, the object side surface S15 is a concave surface, and the image side surface S16 is a concave surface. Light from the object passes through each surface S1 to S16 in order and is finally imaged on the imaging plane (not shown).

[0149] Table 7 lists the related parameters of each lens in the optical imaging lens of the present embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd of the material, Abbe number Vd and conic constant.

[0150]

[0151]

[0152] Table 7

[0153] Table 8 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0154]

[0155]

[0156] Table 8

[0157] like Figure 6A , Figure 6B and Figure 6C As shown, optical imaging lenses 3001, 3002, and 3003 each include eight spacer elements, namely, the first spacer element P1, ..., the seventh spacer element P7, and the eighth spacer element P8. Since the positions of these eight spacer elements are the same as those of the spacer elements in optical imaging lenses 1001, 1002, and 1003 of Embodiment 1, they will not be described again.

[0158] The differences between optical imaging lenses 3001, 3002, and 3003 may lie in the size of the spacer element, the non-effective diameter region of the lens, and the lens barrel structural parameters. Table 9 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 3001, 3002, and 3003 in Embodiment 3. As an example, optical imaging lenses 3001, 3002, and 3003 all have a lens barrel P0.

[0159] Example Three Parameters Optical imaging lens 3001 Optical imaging lens 30012 Optical imaging lens 3003 d2m 2.591 2.589 2.591 d3s 2.792 2.793 2.794 d3m 2.792 2.793 2.794 D3m 4.440 5.526 5.536 d4s 3.345 3.352 3.342 d4m 3.345 3.352 3.342 D4m 5.998 6.018 6.028 d7s 5.978 5.952 6.027 D7m 8.180 8.160 8.150 d0m 9.202 9.202 9.202 EP01 0.770 0.774 0.784 EP23 0.267 0.272 0.294 CP3 0.022 0.022 0.022 EP34 0.510 0.508 0.488 EP45 0.440 0.437 0.445 EP56 0.596 0.601 0.596 EP67 0.667 0.657 0.679 EP70 2.061 2.066 2.049

[0160] Table 9

[0161] Figure 7A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7CThe distortion curve of the optical imaging lens of embodiment three is shown, which represents the distortion size values corresponding to different image heights. Figure 7D The magnification chromatic aberration curve of the optical imaging lens of embodiment three is shown, which represents the deviation of light rays on the imaging surface at different image heights after passing through the lens. According to the formula Figures 7A-7D It can be seen that the optical imaging lens given by embodiment three can achieve good imaging quality.

[0162] In summary, the optical parameters of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of embodiments one to three are shown in Table 10.

[0163]

[0164] Table 10

[0165] The optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of embodiments one to three satisfy the relationships shown in Table 11.

[0166]

[0167]

[0168] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles. It should be understood by those skilled in the art that the utility model scope involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by mutually replacing the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens comprising a lens barrel, and an imaging lens group and a spacer element group disposed in the lens barrel, characterized in that, the imaging lens group comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with refractive power, a sixth lens with positive refractive power, a seventh lens with negative refractive power, and an eighth lens with negative refractive power; the spacer element group comprises a second spacer element located on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element located on the image side of the third lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens, and a sixth spacer element located on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens; the optical imaging lens satisfies 32.85 < f3 / (CT3-EP23) < 37.75 and 20.20 ≤ (EP45+EP56) / T56 < 21.80; wherein f3 is the effective focal length of the third lens, CT3 is the center thickness of the third lens, EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis, EP56 is the spacing distance between the fifth spacer element and the sixth spacer element along the optical axis, and T56 is the air gap between the fifth lens and the sixth lens along the optical axis. 2.The optical imaging lens according to claim 1, wherein, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; and the object side surface of the eighth lens is concave, and the image side surface of the eighth lens is concave. 3.The optical imaging lens according to claim 1, wherein, the spacer element group further comprises a first spacer element located on the image side of the first lens and at least partially in contact with the image side surface of the first lens; the optical imaging lens satisfies 6.45 mm < f1 / (CT1 / EP01) < 7.05 mm; wherein f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens, and EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis. 4.The optical imaging lens according to claim 1, wherein, the spacer element group further comprises a seventh spacer element located on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens; the optical imaging lens satisfies 21.65 < (EP56+EP67) / T67 < 25.65; wherein EP56 is the spacing distance between the fifth spacer element and the sixth spacer element along the optical axis, EP67 is the spacing distance between the sixth spacer element and the seventh spacer element along the optical axis, and T67 is the air gap between the sixth lens and the seventh lens along the optical axis.

5. The optical imaging lens according to claim 4, characterized in that, An object side surface of the fifth lens is a concave surface, and an image side surface of the fifth lens is a convex surface; an object side surface of the sixth lens is a concave surface, and an image side surface of the sixth lens is a convex surface; The optical imaging lens satisfies: 2.54 < f56 / (d7s-d4m) < 3.50; Wherein, f56 is a combined focal length of the fifth lens and the sixth lens, d7s is an inner diameter of an object side surface of the seventh spacer element, and d4m is an inner diameter of an image side surface of the fourth spacer element. 6.The optical imaging lens according to claim 4, wherein, The optical imaging lens satisfies: -2.15mm < D7m / (f8 / |SAG82|) < -1.50mm; Wherein, D7m is an outer diameter of an image side surface of the seventh spacer element, f8 is an effective focal length of the eighth lens, and SAG82 is a distance on the optical axis between an intersection of an image side surface of the eighth lens on the optical axis and an effective radius vertex of the image side surface of the eighth lens. 7.The optical imaging lens according to claim 4, wherein, The optical imaging lens satisfies: 1.70 < EP70 / |SAG82| < 2.30; Wherein, EP70 is a distance along the optical axis direction from the image side surface of the seventh spacer element to an image side end surface of the lens barrel, and SAG82 is a distance on the optical axis between an intersection of an image side surface of the eighth lens on the optical axis and an effective radius vertex of the image side surface of the eighth lens. 8.The optical imaging lens according to any one of claims 1-7, wherein, An object side surface of the fourth lens is a concave surface, and an image side surface of the fourth lens is a convex surface; ​ The optical imaging lens satisfies: 2.00 ≤ R7 / R8 + EP34 / CT4 ≤ 2.30; Wherein, R7 is a curvature radius of an object side surface of the fourth lens, R8 is a curvature radius of an image side surface of the fourth lens, EP34 is a spacer distance along the optical axis direction of the third spacer element and the fourth spacer element, and CT4 is a center thickness of the fourth lens. 9.The optical imaging lens according to any one of claims 1-7, wherein, The optical imaging lens satisfies: 4.10 < d4s / (CT4*N4) < 5.05; Wherein, d4s is an inner diameter of an object side surface of the fourth spacer element, CT4 is a center thickness of the fourth lens, and N4 is a refractive index of the fourth lens. 10.The optical imaging lens according to any one of claims 1-7, wherein, The optical imaging lens satisfies: 0.45 ≤ f*tan(Semi-FOV) / d0m ≤ 0.48; Wherein, f is an effective focal length of the optical imaging lens, Semi-FOV is half of a maximum field of view angle of the optical imaging lens, and d0m is an inner diameter of an image side end surface of the lens barrel.

11. The optical imaging lens according to any one of claims 1-7, wherein, The optical imaging lens satisfies: 1.40 < f56 / f < 1.85 and 1.55 < EP56 / CT6*N6 < 2.30; Wherein, f56 is a combined focal length of the fifth lens and the sixth lens, f is an effective focal length of the optical imaging lens, EP56 is a spacer distance along the optical axis direction of the fifth spacer element and the sixth spacer element, CT6 is a center thickness of the sixth lens, and N6 is a refractive index of the sixth lens.

12. The optical imaging lens according to any one of claims 1-7, wherein, The optical imaging lens satisfies: 1.40 < R8 / R7*N4 < 2.25 and 1.05 ≤ (D4m-d3s) / d3m < 1.20; Wherein, R8 is a curvature radius of an image side surface of the fourth lens, R7 is a curvature radius of an object side surface of the fourth lens, N4 is a refractive index of the fourth lens, D4m is an outer diameter of the image side surface of the fourth spacer element, d3s is an inner diameter of the object side surface of the third spacer element, and d3m is an inner diameter of the image side surface of the third spacer element.

13. The optical imaging lens according to any one of claims 1-7, wherein, The object side surface of the third lens is a convex surface, and the image side surface is a convex surface. The optical imaging lens satisfies 10.45 < (T34 / CP3) / (R6 / R7) < 14.55 and 0.65 < (D3m-d2m) / d3s < 1.

16. Wherein, T34 is an air gap of the third lens and the fourth lens on the optical axis, CP3 is a maximum thickness of the third spacer element, R6 is a curvature radius of the image side surface of the third lens, R7 is a curvature radius of the object side surface of the fourth lens, D3m is an outer diameter of the image side surface of the third spacer element, d2m is an inner diameter of the image side surface of the second spacer element, and d3s is an inner diameter of the object side surface of the third spacer element.

14. The optical imaging lens according to any one of claims 1-7, wherein, The optical imaging lens satisfies 1.50 < CT3 / CT4+EP23 / EP34 < 2.

00. Wherein, CT3 is a center thickness of the third lens, CT4 is a center thickness of the fourth lens, EP23 is a spacing distance of the second spacer element and the third spacer element along the optical axis direction, and EP34 is a spacing distance of the third spacer element and the fourth spacer element along the optical axis direction.

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