Optical imaging lens

Abstract

The invention 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, high-quality imaging and ultrathin design of the lens are balanced, and high-quality imaging is realized while the compact structure of the system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical imaging lens. Background Art

[0002] In today's smartphone market, consumers' requirements for the image quality of mobile phone photos are increasing. With the development of mobile Internet, people are increasingly relying on mobile phones to take photos, record videos and other image recording activities, and have higher expectations for the clarity, color reproduction, and detail performance of mobile phone photos.

[0003] However, traditional mobile phone lenses inevitably face many severe challenges in responding to this growing demand. 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 the size of the lens; 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, for example, the Chinese utility model patent with publication number "CN218068418U" discloses an optical imaging lens, including: an imaging lens group, including 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 sequence from the object side to the image side along the optical axis; although it also involves the technology related to mobile phone lenses, it still has the following problems:

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

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

[0007] Therefore, designing a mobile phone lens with high-quality imaging capabilities and ultra-thin design is still an urgent problem to be solved. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide an optical imaging lens, which balances the high-quality imaging and ultra-thin design of the lens, ensures a compact system structure and achieves high-quality imaging.

[0009] To achieve the above-mentioned object, the present invention provides an optical imaging lens, comprising a lens barrel, an imaging lens group and a spacer element group disposed in the lens barrel,

[0010] The imaging lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power;

[0011] The spacer element group includes 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 central thickness of the third lens, EP23 is the distance between the second spacer element and the third spacer element along the optical axis; EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, EP56 is the 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 on the optical axis.

[0014] According to a technical solution of the present invention, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is concave; the object side surface of the eighth lens is concave, and the image side surface is concave.

[0015] According to a technical solution of the present invention, the spacer element further includes 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 central 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 spacer element along the optical axis.

[0018] According to a technical solution of the present invention, the spacer element group further includes 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;

[0019] The optical imaging lens meets the following requirements: 21.65<(EP56+EP67) / T67<25.65;

[0020] Among them, EP56 is the spacing distance between the fifth spacing element and the sixth spacing element along the optical axis, EP67 is the spacing distance between the sixth spacing element and the seventh spacing element along the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0021] According to a technical solution of the present invention, the object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is convex;

[0022] The optical imaging lens meets the following requirements: 2.54 <f56 / (d7s-d4m)<3.50;

[0023] Among them, 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.

[0024] According to a technical solution of the present invention, the optical imaging lens meets the following requirements: -2.15mm <D7m / (f8 / |SAG82|)<-1.50mm;

[0025] Among them, D7m is the outer diameter of the image side surface of the seventh spacer element, f8 is the effective focal length of the eighth lens, and SAG82 is the distance on the optical axis from the intersection of the image side surface of the eighth lens on the optical axis to the vertex of the effective radius of the image side surface of the eighth lens.

[0026] According to a technical solution of the present invention, the optical imaging lens meets the following requirements: 1.70 <EP70 / |SAG82|<2.30;

[0027] Among them, EP70 is the distance from the image side surface of the seventh spacer element to the image side end surface of the lens barrel along the optical axis, and SAG82 is the distance on the optical axis from the intersection of the image side surface of the eighth lens on the optical axis to the effective radius vertex of the image side surface of the eighth lens.

[0028] According to a technical solution of the present invention, the object side surface of the fourth lens is concave, and the image side surface is convex;

[0029] The optical imaging lens meets the following requirements: 2.00≤R7 / R8+EP34 / CT4≤2.30;

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

[0031] According to a technical solution of the present invention, the optical imaging lens satisfies: 4.10 < d4s / (CT4*N4) < 5.05;

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

[0033] According to a technical solution of the present invention, 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 of view 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 a technical solution of the present invention, 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 distance between the fifth spacer element and the sixth spacer element along the optical axis direction, CT6 is the central thickness of the sixth lens, and N6 is the refractive index of the sixth lens.

[0037] According to a technical solution of the present invention, 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 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 spacer element, d3s is the inner diameter of the object side surface of the third spacer element, and d3m is the inner diameter of the image side surface of the third spacer element.

[0039] According to a technical solution of the present invention, the object side surface of the third lens is a convex surface and the image side surface 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 between the third lens and the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer element, R6 is the radius of curvature of the image side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, D3m is the outer diameter of the image side of the third spacer element, d2m is the inner diameter of the image side of the second spacer element, and d3s is the inner diameter of the object side of the third spacer element.

[0042] According to a technical solution of the present invention, the optical imaging lens satisfies: 1.50 < CT3 / CT4 + EP23 / EP34 < 2.00;

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

[0044] Advantages of the present invention:

[0045] The optical imaging lens of the present application uses eight lenses with optical power, and the first lens to the eighth lens are arranged in sequence at intervals. It satisfies the relational expression "32.85 < f3 / (CT3 - EP23) < 37.75", which will make the depth of field of the system shallower. The shallower depth of field will cause a certain degree of decline in the imaging quality, especially in the edge area of the depth of field. By controlling the spacing distance between the air gap of the fourth spacer element and the fifth spacer element, the air gap between the fifth spacer element and the sixth spacer element, and the spatial gap between the fifth lens and the sixth lens within a certain range, the relationship between the thickness and the air gap of the structural areas of the fifth lens and the sixth lens can be restricted. 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 structural areas of the fifth lens and the sixth lens, which is beneficial to the stability of the bearing between the fifth lens and the sixth lens located at the rear end after the lens assembly. It reduces the influence of the lens tilt or offset on the air gap, ensures the air gap between the fifth lens and the sixth lens, and can effectively solve problems such as optical distortion, chromatic aberration, and resolution reduction. Thus, while maintaining a wide-angle field of view and a shallower depth of field, the clarity and detail expressiveness of the image are ensured, meeting the requirements of high-quality imaging. Brief Description of the Drawings

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1A A schematic diagram showing a structural arrangement diagram of an optical imaging lens according to the present invention and some parameters thereof;

[0048] Figure 1B A schematic diagram of the structure of the effective diameter of the eighth lens of an optical imaging lens according to the present invention and a schematic diagram of some parameters are shown;

[0049] Figure 2A , Figure 2B and Figure 2C Shown are schematic structural diagrams of three optical imaging lenses according to Embodiment 1 of the present application;

[0050] FIG. 3A to FIG. 3D The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens according to the first embodiment of the present application are respectively shown;

[0051] Figure 4A , Figure 4B and Figure 4C Shown are schematic structural diagrams of three optical imaging lenses according to Embodiment 2 of the present application;

[0052] FIG. 5A to FIG. 5D The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens according to the second embodiment of the present application are respectively shown;

[0053] Fig. 6A , Figure 6B and Figure 6C Shown are schematic structural diagrams of three optical imaging lenses according to Embodiment 3 of the present application;

[0054] FIG. 7A to FIG. 7D The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens according to the third embodiment of the present application are respectively shown;

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

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

[0057] Fig.10A diffraction modulation transfer function diagram of an optical imaging lens in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0058] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

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

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

[0061] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0062] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0063] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0064] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following examples only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application.

[0065] like Figure 1A and Figure 1B As shown, the optical imaging lens group of an exemplary embodiment of the present invention includes eight lenses, which include, 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 has an air gap on the optical axis.

[0066] The spacer element group includes at least the first spacer element to the seventh spacer element;

[0067] The imaging lens group and the spacing element group are accommodated in a lens barrel, which includes an object side end face, an image side end face, an outer annular surface and an inner annular surface. Along the optical axis direction of the optical imaging lens, the inner annular surface of the lens barrel is stepped.

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

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

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

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

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

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

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

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

[0076] By reasonably distributing the focal powers of each lens and the combination of convex and concave surfaces, on the one hand, it can effectively reduce chromatic aberration and spherical aberration, and improve the color accuracy and clarity of the image; on the other hand, it can control the focal length and depth of field to achieve a good background blurring effect; at the same time, it optimizes the light distribution, reduces optical distortion, and improves the imaging uniformity and brightness; in addition, it also improves the sharpness, contrast and color saturation of the image to achieve a high-quality imaging effect.

[0077] In some embodiments of the present invention, 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.

[0078] In some embodiments of the present invention, the optical imaging lens satisfies: 32.85 < f3 / (CT3 - EP23) < 37.75 and 20.0 < (EP45 + EP56) / T56 < 21.80; where f3 is the effective focal length of the third lens, CT3 is the central thickness of the third lens, EP23 is the distance between the second spacer element and the third spacer element along the optical axis; EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, EP56 is the 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 on the optical axis.

[0079] By controlling the proportional relationship among the effective focal length, central thickness of the third lens, and the air gap distance between the second spacer element and the third spacer element within a reasonable range, light loss and interference can be reduced, light utilization efficiency can be improved, and at the same time, the depth of field of the system will become shallower, which is beneficial to the blurring of the imaging background. However, a shallower depth of field will cause a certain degree of decline in imaging quality, especially in the edge area of the depth of field. To address this, by controlling the relationship among the air gaps 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 spatial gap between the fifth lens and the sixth lens within a certain range, the relationship between the thickness and air gap of the structural areas of the fifth lens and the sixth lens can be restricted. By setting a fifth spacer element with a reasonable thickness in the air gap between the fifth lens and the sixth lens, the thickness of the structural areas of the fifth lens and the sixth lens can be ensured to be reasonable, which is beneficial to the stability of the contact between the fifth lens and the sixth lens located at the rear end after the lens assembly is in contact, reduces the influence of lens tilt or offset on the air gap, and ensures the air gap between the fifth lens and the sixth lens, effectively solving problems such as optical distortion, chromatic aberration, and resolution reduction. Thus, while maintaining a wide-angle field of view and a shallower depth of field, the clarity and detail performance of the image can be ensured, meeting the requirements of high-quality imaging.

[0080] For example, when f3 / (CT3 - EP23) = 36.14, the above relationship is satisfied. At this time, when (EP45 + EP56) / T56 = 18.27, it is below the lower limit of the range. As Figure 8 shown, the field curvature offset and imaging blur at 0.8F and 1.0F fields of view; when (EP45 + EP56) / T56 = 27.41, it exceeds the upper limit of the range. As Fig. 9 shown, the field curvature offset and imaging distortion at 0.8F and 1.0F fields of view; when (EP45 + EP56) / T56 = 21.79, the above relationship is satisfied. As Fig.10 shown, the field curvature is concentrated, the peak is high, the aberration is small, and the imaging is clear.

[0081] In some embodiments of the present invention, the optical imaging lens satisfies: 6.45mm < f1 / (CT1 / EP01) < 7.05mm; where f1 is the effective focal length of the first lens, CT1 is the central thickness of the first lens, and EP01 is the distance along the optical axis between the object-side end face of the lens barrel and the object-side surface of the first spacer element.

[0082] By controlling the ratio of the effective focal length of the first lens to its central thickness and the distance of the spacer element, it helps to constrain the thickness of the structural region of the first lens while ensuring sufficient wall thickness at the object-side end face of the lens barrel, ensuring the thickness ratio of the first lens. The shorter positive focal length of the first lens is beneficial to the system focal length balance and optical performance, can effectively control aberrations such as chromatic aberration and spherical aberration, and optimize the depth of field, making the imaging subject more prominent and the background softly blurred.

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

[0084] By controlling the proportional relationship of the distance between the fifth spacer element and the sixth spacer element, the distance between the sixth spacer element and the seventh spacer element, and the air gap between the fifth lens and the sixth lens, the relationship between the thickness of the structural regions of the sixth lens and the seventh lens and the optical relationship of the air gap between the two lenses is constrained, so as to ensure reasonable thickness of the structural regions of the two lenses, which is beneficial to the stable bearing of the lenses during assembly, reduce the tilt and deviation of the lenses after assembly, reduce the influence on the air gap, can better reduce chromatic aberration and distortion, improve the imaging clarity and color accuracy, and at the same time can maintain the performance stability of the system under different temperature conditions, achieving more stable optical performance.

[0085] In some embodiments of the present invention, the optical imaging lens satisfies: 2.54 < f56 / (d7s - d4m) < 3.50; where 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 spacer element, and d4m is the inner diameter of the image side surface of the fourth spacer element.

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

[0087] In some embodiments of the present invention, the optical imaging lens satisfies: -2.15 mm < D7m / (f8 / |SAG82|) < -1.50 mm; where D7m is the outer diameter of the image side surface of the seventh spacer 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 vertex of the effective radius of the image side surface of the eighth lens.

[0088] The outer diameter of the image side of the seventh spacer element and the outer diameter of the eighth lens are located at the same inner diameter position inside the lens barrel. By controlling the proportional relationship between the outer diameter of the image side of the seventh spacer element, the effective focal length of the eighth lens, and the back sagittal height, the outer diameter and shape of the eighth lens can be restricted, the utilization rate of light can be improved, more light can effectively participate in imaging, and it helps the light to be accurately focused on the imaging surface, reducing imaging blur and distortion, and making the image details clearer and distinguishable.

[0089] In some embodiments of the present invention, the optical imaging lens satisfies: 1.70 < EP70 / |SAG82| < 2.30; where EP70 is the distance from the image side surface of the seventh spacer element to the image side end surface of the lens barrel along the optical axis direction, 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.

[0090] By controlling the proportional relationship between the distance from the image side surface of the seventh spacer element to the image side end surface of the lens barrel and the back sagittal height of the eighth lens, the edge thickness and the image side curvature of the eighth lens can be controlled, which is beneficial for the image side surface of the eighth lens not to exceed the lens barrel to cause friction and is convenient for later matching with the module.

[0091] In some embodiments of the present invention, the optical imaging lens satisfies: 2.00 ≤ R7 / R8 + EP34 / CT4 ≤ 2.30; where 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 distance between the third spacer element and the fourth spacer element along the optical axis direction, and CT4 is the central thickness of the fourth lens.

[0092] By controlling the relationship between the curvature radius of the object side surface of the fourth lens, the curvature radius of the image side surface, the distance between the fourth spacer element and the fifth spacer element, and the central thickness of the fourth lens, EP34 can restrict the thickness of the structural area of the fourth lens. Furthermore, restricting the ratio relationship of EP34 / CT4 can restrict the thickness ratio between the structural area and the center of the fourth lens. Combining the limitation of the curvature radius effectively restricts the overall shape of the fourth lens, reduces the imaging difficulty while effectively reducing the chromatic aberration when light passes through the lens, improves the focusing accuracy of different wavelength lights, and reduces chromatic aberration and spherical aberration.

[0093] In some embodiments of the present invention, the optical imaging lens satisfies: 4.10 < d4s / (CT4*N4) < 5.05; where d4s is the inner diameter of the object side surface of the fourth spacer element, CT4 is the central thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

[0094] By controlling the ratio relationship among the inner diameter of the object side of the fourth spacer element, the central thickness of the fourth lens, and the refractive index of the fourth lens, the accuracy of light propagation between the lens and the spacer element can be ensured, which helps to optimize and reduce the optical distortion of the lens and the focusing difference of light with different wavelengths in the lens, thereby improving the system chromatic aberration and enhancing the overall optical performance.

[0095] In some embodiments of the present invention, the optical imaging lens satisfies: 0.45 ≤ f * tan(Semi - FOV) / d0m ≤ 0.48; where 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 face of the lens barrel.

[0096] By controlling the ratio relationship among the effective focal length of the lens, the maximum half - field of view angle, and the inner diameter of the image - side end face of the lens barrel, it helps to optimize the field of view angle and focal length of the lens, increase the image coverage range, and control the lens distortion to maintain the authenticity and accuracy of the image.

[0097] In some embodiments of the present invention, the optical imaging lens satisfies: 1.40 < f56 / f < 1.85 and 1.55 < EP56 / CT6 * N6 < 2.30; where 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 axial spacing distance between the fifth spacer element and the sixth spacer element, CT6 is the central thickness of the sixth lens, and N6 is the refractive index of the sixth lens.

[0098] By controlling the ratio 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 be ensured to meet the design requirements, which helps to guarantee the imaging performance of the lens; while controlling the ratio relationship among the spacing distance between the fifth spacer element and the sixth spacer element, the central thickness of the sixth lens, and the refractive index, it helps to restrict the thickness - to - thinness ratio and refractive index of the sixth lens, optimize the light path through the sixth lens, reduce the reflection of light in the structural area of the sixth lens, and reduce the risk of internal reflection stray light.

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

[0100] By controlling the curvature radii and refractive indices of the object side and image side of the fourth lens, it helps to improve spherical aberration and chromatic aberration, and can enhance the clarity of imaging and color accuracy. At the same time, by controlling the outer diameter of the image side of the fourth spacer element, the inner diameter of the object side of the third spacer element, and the inner diameter of the image side of the third spacer element, it helps to control the propagation path of light inside the lens, reduce light loss and scattering, and improve the brightness and contrast of imaging.

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

[0102] By controlling the proportional relationship between the air gap between the third lens and the fourth lens on the optical axis, the maximum thickness of the third spacer element, and the curvature radii of the image side of the third lens and the object side of the fourth lens, light deviation and energy loss can be reduced, the utilization rate of light can be improved, and more light can be accurately focused on the imaging surface, thereby enhancing the brightness and contrast of imaging, contributing to the improvement of imaging clarity and accuracy. For the tiny details and edge parts in the image, a sharper effect can be presented, improving the imaging quality. At the same time, by controlling the ratio of the difference between the outer diameter of the image side of the third spacer element and the inner diameter of the image side of the second spacer element to the inner diameter of the object side of the third spacer element, it helps the transmission of light inside the lens, reduces light loss and scattering, and further improves the imaging performance.

[0103] In some embodiments of the present invention, the optical imaging lens satisfies: 1.50 < CT3 / CT4 + EP23 / EP34 < 2.00; where CT3 is the central thickness of the third lens, CT4 is the central thickness of the fourth lens, EP23 is the axial spacing distance between the second spacer element and the third spacer element, and EP34 is the axial spacing distance between the third spacer element and the fourth spacer element.

[0104] By controlling the ratio of the central thicknesses of the third lens and the fourth lens and the ratio relationship between the spacing distances of the second and third spacer elements and the third and fourth spacer elements, the ratio of the central thicknesses of the third lens and the fourth lens and the edge thickness ratio can be achieved. Furthermore, through the two lenses, the focal length and field of view angle of the lens can be finely adjusted to improve spherical aberration and chromatic aberration, and reduce the aberration caused by optical distortion, thereby obtaining a clearer and more realistic image.

[0105] The optical imaging lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the eight lenses mentioned above. By reasonably allocating the focal length, surface shape and arrangement of each spacing element of each lens, the span of each gear of the lens and the lens barrel is made more uniform, which enhances the ability of light convergence and improves the imaging quality of the optical imaging lens. However, it should be understood by those skilled in the art that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solution claimed for protection in the present application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiment, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0106] In some embodiments of the present invention, the lens material in the optical imaging lens provided by the present invention may be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt a full plastic lens structure, which not only makes the lens have excellent imaging performance, but also makes the structure of the lens more compact, and can better achieve a balance between miniaturization of the lens and high image quality.

[0107] In some embodiments of the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens may be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and reducing the size of lenses, and better realizing the miniaturization of lenses. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens of the present invention may all be aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and reducing the size of lenses, and realizing the miniaturization of lenses.

[0108] When the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0109]

[0110] In the above formula, z is the axial distance from the surface to the vertex at a height y perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the cone coefficient; A4, A6, A8, A 10 , A 12 , A 14 , A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0111] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0112] Embodiment 1

[0113] The following reference FIG. 2A to FIG. 3D An optical imaging lens 1001 , an optical imaging lens 1002 , and an optical imaging lens 1003 according to the first embodiment of the present application are described. Figure 2A , Figure 2B and Figure 2C The schematic diagrams of the structures of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 according to the first embodiment of the present application are respectively shown.

[0114] like Figure 2A , Figure 2B and Figure 2C As shown, 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 a plurality of spacing elements P1-P8.

[0115] In the first embodiment, the structural schematic diagrams of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 use the same imaging lens group, and the imaging lens group includes, 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 focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has positive power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has negative power, its object side surface S15 is concave, and its image side surface S16 is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on an imaging surface (not shown).

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

[0117]

[0118]

[0119] Table 1

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

[0121]

[0122]

[0123] Table 2

[0124] like 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 include eight spacer elements, and the eight spacer elements are a first spacer element P1, ..., a seventh spacer element P7 and an eighth spacer element P8. Among them, the first spacing element P1 is arranged between the first lens E1 and the second lens E2 and is in contact with the image side surface of the first lens E1, the second spacing element P2 is arranged between the second lens E2 and the third lens E3 and is in contact with the image side surface of the second lens E2, the third spacing element P3 is arranged between the third lens E3 and the fourth lens E4 and is in contact with the image side surface of the third lens E3, the fourth spacing element P4 is arranged between the fourth lens E4 and the fifth lens E5 and is in contact with the image side surface of the fourth lens E4, the fifth spacing element P5 is arranged between the fifth lens E5 and the sixth lens E6 and is in contact with the image side surface of the fifth lens E5, the sixth spacing element P6 is arranged between the sixth lens E6 and the seventh lens E7 and is in contact with the image side surface of the sixth lens E6, the seventh spacing element P7 is arranged between the seventh lens E7 and the eighth lens E8, and the seventh spacing element P7 is in contact with the image side surface of the seventh lens E7, and the eighth spacing element P8 is in contact with the image side surface of the eighth lens E8. In this embodiment, the first to seventh spacing elements P1 to P7 are spacers, and the eighth spacing element P8 is a spacer or a pressure ring. The above-mentioned spacing elements P1 to P8 can block the entry of extra external light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 is enhanced.

[0125] The differences between the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 may be the size of the spacer element, the lens non-effective diameter area and the lens barrel structure parameters. Table 3 shows the basic parameter table of the spacer element and the lens barrel of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 of the first embodiment. As an example, the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 all have a lens barrel P0.

[0126]

[0127]

[0128] Table 3

[0129] Figure 3A The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 3B The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 3CThe distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 3A to FIG. 3D It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0130] Embodiment 2

[0131] The following reference 4A to 5D An optical imaging lens 2001 , an optical imaging lens 2002 , and an optical imaging lens 2003 according to a second embodiment of the present application are described. Figure 4A , Figure 4B and Figure 4C The schematic structural diagrams of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 according to the second embodiment of the present application are respectively shown.

[0132] like Figure 4A , Figure 4B and Figure 4C As shown, 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 spacing elements P1-P8.

[0133] In the second embodiment, the structural schematic diagrams of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 use the same imaging lens group, and the imaging lens group includes, 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 focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has positive power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has negative power, its object side surface S15 is concave, and its image side surface S16 is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on an imaging surface (not shown).

[0134] Table 4 lists the relevant parameters of each lens in the optical imaging lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd of the material, Abbe number Vd and cone coefficient.

[0135] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd Cone coefficient OBJ Spherical endless endless S1 Aspheric 2.2131 0.7037 1.546 55.99 0 S2 Aspheric 5.8272 0.1785 0 STO Spherical endless 0.0927 S3 Aspheric 6.2539 0.2000 1.694 18.4 0 S4 Aspheric 3.8276 0.2123 0 S5 Aspheric 7.0429 0.5653 1.546 55.99 0 S6 Aspheric -13.3575 0.2312 0 S7 Aspheric -13.3253 0.4076 1.694 18.4 0 S8 Aspheric -17.5123 0.2482 0 S9 Aspheric -2.4428 0.5564 1.546 55.99 0 S10 Aspheric -2.3848 0.0541 0 S11 Aspheric -6.9472 0.4472 1.518 64.16 0 S12 Aspheric -3.0462 0.0450 0 S13 Aspheric 3.6957 0.5082 1.694 18.4 0 S14 Aspheric 3.0433 0.7954 0 S15 Aspheric -7.4671 0.3971 1.537 55.62 0 S16 Aspheric 4.0062 0.1416 0 S17 Spherical endless 0.2100 1.518 64.2 S18 Spherical endless 0.5400 S19 Spherical endless

[0136] Table 4

[0137] Table 5 lists the aspheric coefficients of the aspheric lenses of the zoom lens of this embodiment, including: A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0138] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[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 number <![CDATA[A 18 ]]> <![CDATA[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] like Figure 4A , Figure 4B and Figure 4C As shown, the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 each include eight spacer elements, which are respectively a first spacer element P1, ..., a seventh spacer element P7 and an eighth spacer element P8. Since the positions of the above eight spacer elements are the same as those of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 in the first embodiment, they are not described in detail.

[0141] The differences between the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 may be the size of the spacer element, the lens non-effective diameter area and the lens barrel structure parameters. Table 6 shows the basic parameter table of the spacer element and the lens barrel of the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 of the second embodiment. As an example, the optical imaging lens 2001, the optical imaging lens 2002 and the optical imaging lens 2003 all have a lens barrel P0.

[0142] Example 2 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 axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 5B The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 5CThe distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 5A to FIG. 5D It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0145] Embodiment 3

[0146] The following reference 6A to 7D An optical imaging lens 3001 , an optical imaging lens 3002 , and an optical imaging lens 3003 according to a third embodiment of the present application are described. Fig. 6A , Figure 6B and Figure 6C The schematic diagrams of the structures of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 according to the third embodiment of the present application are respectively shown.

[0147] like Fig. 6A , Figure 6B and Figure 6C As shown, 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 spacing elements P1-P8.

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

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

[0150]

[0151]

[0152] Table 7

[0153] Table 8 lists the aspheric coefficients of the aspheric lenses of 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 Fig. 6A , Figure 6B and Figure 6C As shown, the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 each include eight spacer elements, which are respectively a first spacer element P1, ..., a seventh spacer element P7 and an eighth spacer element P8. Since the positions of the above eight spacer elements are the same as those of the optical imaging lens 1001, the optical imaging lens 1002 and the optical imaging lens 1003 in the first embodiment, they are not described in detail.

[0158] The differences between the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 may be the size of the spacer element, the lens non-effective diameter area and the lens barrel structure parameters. Table 9 shows the basic parameter table of the spacer element and the lens barrel of the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 of the third embodiment. As an example, the optical imaging lens 3001, the optical imaging lens 3002 and the optical imaging lens 3003 all have a lens barrel P0.

[0159] Example 3 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] Fig. 7A The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 7B The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7C The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.7D The magnification chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 7A to FIG. 7D It can be seen that the optical imaging lens provided in the third embodiment 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 1 to 3 are shown in Table 10 below.

[0163]

[0164] Table 10

[0165] The optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Embodiments 1 to 3 satisfy the relationship shown in Table 11.

[0166]

[0167]

[0168] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical imaging lens, comprising a lens barrel, and an imaging lens group and a spacer element group disposed within the lens barrel, wherein the imaging lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with optical power, a fifth lens with optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power; the spacer element group includes 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 20.0 < (EP45 + EP56) / T56 < 21.80; wherein, f3 is the effective focal length of the third lens, CT3 is the central thickness of the third lens, EP23 is the distance between the second spacer element and the third spacer element along the optical axis; EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, EP56 is the 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 on 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 is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is concave; the object side surface of the eighth lens is concave, and the image side surface is concave.

3. The optical imaging lens according to claim 1, wherein: The spacer element further includes 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 central 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 spacer element along the optical axis.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes 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 distance between the fifth spacer element and the sixth spacer element along the optical axis, EP67 is the 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 on the optical axis.

5. The optical imaging lens according to claim 4, characterized in that: The object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is convex; The optical imaging lens meets the following requirements: 2.54 <f56 / (d7s-d4m)<3.50; Among them, 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.

6. The optical imaging lens according to claim 4, wherein: The optical imaging lens meets the following requirements: -2.15mm <D7m / (f8 / |SAG82|)<-1.50mm; Among them, D7m is the outer diameter of the image side surface of the seventh spacer element, f8 is the effective focal length of the eighth lens, and SAG82 is the distance on the optical axis from the intersection of the image side surface of the eighth lens on the optical axis to the vertex of the effective radius of the image side surface of the eighth lens.

7. The optical imaging lens according to claim 4, wherein: The optical imaging lens meets the following requirements: 1.70 <EP70 / |SAG82|<2.30; Among them, EP70 is the distance from the image side surface of the seventh spacer element to the image side end surface of the lens barrel along the optical axis, and SAG82 is the distance on the optical axis from the intersection of the image side surface of the eighth lens on the optical axis to the effective radius vertex of the image side surface of the eighth lens.

8. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The object side surface of the fourth lens is concave, and the image side surface is convex; The optical imaging lens meets the following requirements: 2.00≤R7 / R8+EP34 / CT4≤2.30; Among them, 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 spacing distance between the third spacing element and the fourth spacing element along the optical axis, and CT4 is the center thickness of the fourth lens.

9. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The optical imaging lens meets the following requirements: 4.10 <d4s / (CT4*N4)<5.05; Wherein, d4s is the inner diameter of the object side surface of the fourth spacer element, CT4 is the center thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

10. The optical imaging lens according to any one of claims 1 to 7, characterized in that: The optical imaging lens satisfies: 0.45≤f*tan(Semi-FOV) / d0m≤0.48; Among them, 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.

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