Optical imaging lens

Abstract

The present application discloses an optical imaging lens. The optical imaging lens 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 positive refractive power; a sixth lens with positive refractive power; a seventh lens with positive refractive power; and an eighth lens with negative refractive power. The optical imaging lens further comprises a first spacer element between the first lens and the second lens; a second spacer element between the second lens and the third lens; and a third spacer element between the third lens and the fourth lens. The optical imaging lens satisfies: 3.0 < EP12 / CT2 + f3 / d3s < 5.5.

Description

Technical Field

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

[0002] In recent years, the development of optical imaging lenses for smartphones has been rapid, and the upgrading and iteration of mobile phone lenses has become one of the important factors in mobile phone replacement. At the same time, users have increasingly higher requirements for the image quality of mobile phone lenses. In order to improve the competitiveness of their products, major smartphone manufacturers have put forward higher design requirements for the optical imaging lenses used in smartphones.

[0003] In the field of optical imaging lenses, the air gap between the first and second lenses during lens assembly significantly affects the assembly stability. For example, if the air gap between the first and second lenses is too large, it can easily lead to misalignment, resulting in either no imaging or only partial imaging. Furthermore, if the air gap between the first and second lenses is too large, light rays emitted from the first lens may enter the non-optical areas of the second lens, easily generating stray light and affecting image quality. On the other hand, if the optical power, surface shape, and position of the spacers in an optical imaging lens are not properly configured, it may cause chaotic deflection paths of light within the lens, easily generating stray light.

[0004] Therefore, how to rationally arrange the lenses and spacers in an optical imaging lens, and rationally set the optical parameters of the optical imaging lens, in order to control the light path in the optical imaging lens, optimize the assembly stability of the optical imaging lens, reduce stray light in the optical imaging lens, and improve the imaging quality of the optical imaging lens, is one of the urgent problems to be solved in the field of optical imaging. Summary of the Invention

[0005] This application provides an optical imaging lens comprising, along the optical axis from the object side to the image side, 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 positive optical power; a sixth lens with positive optical power; a seventh lens with positive optical power; and an eighth lens with negative optical power. The optical imaging lens further includes: a first spacer element located between the first and second lenses; a second spacer element located between the second and third lenses; and a third spacer element located between the third and fourth lenses. The optical imaging lens satisfies: 3.0 < EP12 / CT2 + f3 / d3s < 5.5, where CT2 is the center thickness of the second lens along the optical axis, f3 is the effective focal length of the third lens, EP12 is the distance between the first and second spacers in a direction parallel to the optical axis, and d3s is the inner diameter of the object side of the third spacer element.

[0006] In one embodiment, at least one of the object-side surfaces of the first lens to the image-side surface of the eighth lens is an aspherical mirror.

[0007] In one embodiment, the optical imaging lens further includes a seventh spacer element located between the seventh lens and the eighth lens, wherein the optical imaging lens satisfies: 5.0 < |f8 / (CP7-CT8)| < 19.0, where f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens on the optical axis, and CP7 is the maximum thickness of the seventh spacer element.

[0008] In one embodiment, the optical imaging lens further includes a fourth spacer element located between the fourth lens and the fifth lens, wherein the optical imaging lens satisfies: 1.0 < f4 / d4s < 11.5, where f4 is the effective focal length of the fourth lens and d4s is the inner diameter of the object side of the fourth spacer element.

[0009] In one embodiment, the optical imaging lens further includes a sixth spacer element located between the sixth lens and the seventh lens, wherein the optical imaging lens satisfies: 1.0 < f6 / d6s < 3.0, where d6s is the inner diameter of the object side of the sixth spacer element and f6 is the effective focal length of the sixth lens.

[0010] In one embodiment, the optical imaging lens may satisfy: 8.0 < f / (D1m-D1s+CP1) < 16.0, where D1m is the outer diameter of the image side of the first spacer element, D1s is the outer diameter of the object side of the first spacer element, f is the total effective focal length of the optical imaging lens, and CP1 is the maximum thickness of the first spacer element.

[0011] In one embodiment, the optical imaging lens can satisfy: 1.0 < (D7m + d7m)) / (R14 - R13) < 84.0, where D7m is the outer diameter of the image-side surface of the seventh spacer element, d7m is the inner diameter of the image-side surface of the seventh spacer element, R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens.

[0012] In one embodiment, the optical imaging lens may satisfy: -10.0 < f2 / d2s < -2.0, where d2s is the inner diameter of the object side of the second spacer element and f2 is the effective focal length of the second lens.

[0013] In one embodiment, the optical imaging lens may satisfy: 2.0 < (f6 × CT3) / (d6s × EP23) < 6.5, where d6s is the inner diameter of the object side of the sixth spacer element, EP23 is the spacing distance between the second and third spacers elements in the direction parallel to the optical axis, f6 is the effective focal length of the sixth lens, and CT3 is the center thickness of the third lens on the optical axis.

[0014] In one embodiment, the optical imaging lens may satisfy: 1.0 < CT3 × CT4 / (EP34 × CP4) < 4.0, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, EP34 is the spacing between the third and fourth spacers in the direction parallel to the optical axis, and CP4 is the maximum thickness of the fourth spacer.

[0015] In one embodiment, the optical imaging lens further includes a fifth spacer element located between the fifth lens and the sixth lens, wherein the optical imaging lens satisfies: 3.0 < |CP5 / (EP45-T45)| < 34.0, where CP5 is the maximum thickness of the fifth spacer element, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element in the direction parallel to the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0016] In one embodiment, the optical imaging lens may satisfy: 1.0 < (EP67 + CT6) / EP56 < 4.0, where CT6 is the center thickness of the sixth lens on the optical axis, EP56 is the spacing between the fifth and sixth spacers in the direction parallel to the optical axis, and EP67 is the spacing between the sixth and seventh spacers in the direction parallel to the optical axis.

[0017] In one embodiment, the optical imaging lens can satisfy: 6.0 < (D6m + f) / R11 < 12.5, where D6m is the outer diameter of the image side of the sixth spacer element, R11 is the radius of curvature of the object side of the sixth lens, and f is the total effective focal length of the optical imaging lens.

[0018] In one embodiment, the optical imaging lens may satisfy: -4.5 < (R10 + R11) / D5s < 0, where R10 is the radius of curvature of the image side of the fifth lens, R11 is the radius of curvature of the object side of the sixth lens, and D5s is the outer diameter of the object side of the fifth spacer element.

[0019] In one embodiment, the optical imaging lens further includes a lens barrel for accommodating the first to eighth lenses, and the optical imaging lens can satisfy: 4.5 < (L + CP1) / (T12 + EP12) < 8.5, where L is the maximum height of the lens barrel, CP1 is the maximum thickness of the first spacer element, T12 is the air gap between the first and second lenses on the optical axis, and EP12 is the spacing distance between the first and second spacers in the direction parallel to the optical axis.

[0020] In an exemplary embodiment of this application, by reasonably controlling the optical power and surface shape of each lens, such as setting the first, third, fourth, fifth, sixth, and seventh lenses to have positive optical power and the second and eighth lenses to have negative optical power, it is beneficial to control the field curvature and astigmatism of the optical imaging lens, and to reasonably control the deflection angle of the principal ray, thereby improving the matching degree between the lens and the chip. For example, by setting a first, second, and third spacer element between the first and fourth lenses, and satisfying 3.0 < EP12 / CT2 + f3 / d3s < 5.5, the angle between the light passing through the fourth lens and the optical axis can be reduced, making the light more convergent and thus improving relative illumination. Furthermore, excess light can be absorbed by the third spacer element, reducing ghosting stray light caused by light leakage in the edge area of ​​the fourth lens. Additionally, the surface smoothness of the second lens can be improved, reducing interference on the assembly bearing surface and increasing the lens bearing tightness, thereby improving stability. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1A and Figure 1B The structural schematic diagrams of the optical imaging lenses under the two implementation methods in Example 1 are shown respectively;

[0023] Figures 2A to 2D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 1 are shown respectively.

[0024] Figure 3A and Figure 3B The structural schematic diagrams of the optical imaging lenses under the two implementation methods in Example 2 are shown respectively;

[0025] Figures 4A to 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 2 are shown respectively.

[0026] Figure 5A and Figure 5BThe structural schematic diagrams of the optical imaging lenses under the two implementation methods in Example 3 are shown respectively;

[0027] Figures 6A to 6D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 3 are shown respectively.

[0028] Figure 7A and Figure 7B The structural schematic diagrams of the optical imaging lenses under the two implementation methods in Example 4 are shown respectively;

[0029] Figures 8A to 8D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 4 are shown respectively.

[0030] Figure 9 A schematic diagram showing partial parameters of an optical imaging lens according to an embodiment of this application is shown; and

[0031] Figure 10 A partial optical path diagram of an optical imaging lens according to an embodiment of this application is shown. Detailed Implementation

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

[0033] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens, and the first spacer element may also be referred to as the second spacer element or the third spacer element.

[0034] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale. It should be understood that, for ease of illustration, the thickness, size, and shape of the spacer elements and lens barrel have also been slightly exaggerated in the accompanying drawings.

[0035] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. It should be understood that the surface of each spacer element closest to the subject is called the object-side surface of the spacer element, and the surface of each spacer element closest to the imaging plane is called the image-side surface of the spacer element. The surface of the lens barrel closest to the subject is called the object-side end of the lens barrel, and the surface of the lens barrel closest to the imaging plane is called the image-side end of the lens barrel.

[0036] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0037] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens groups (i.e., the first lens to the eighth lens), lens barrel structure, and spacer elements in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel structure, spacer elements, etc. of that embodiment. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

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

[0040] An optical imaging lens according to an exemplary embodiment of this application may include eight lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. These eight lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first to eighth lenses may have a gap distance.

[0041] According to an exemplary embodiment of this application, each of the first to eighth lenses may have an optical region for optical imaging and a non-optical region extending outward from the outer periphery of the optical region. Generally speaking, the optical region refers to the area of ​​the lens used for optical imaging, while the non-optical region is the structural area of ​​the lens. During the assembly of the optical imaging lens, spacer elements can be set at the non-optical regions of each lens using processes such as adhesive bonding, and each lens can be connected to the lens barrel. During the imaging process of the optical imaging lens, the optical regions of each lens can transmit light from the object to form an optical path, forming the final optical image; while the non-optical regions of each assembled lens are housed in the lens barrel, which cannot transmit light, thus the non-optical regions do not directly participate in the imaging process of the optical imaging lens. It should be noted that, for ease of description, this application describes each lens as divided into two parts: an optical region and a non-optical region. However, it should be understood that the optical region and the non-optical region of the lens can be formed as a whole during the manufacturing process, rather than as two separate parts.

[0042] An optical imaging lens according to an exemplary embodiment of this application may include seven spacer elements respectively located between a first lens and an eighth lens, namely a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, and a seventh spacer element. Specifically, the optical imaging lens may include a first spacer element located between a first lens and a second lens, which may abut against a non-optical region on the image-side side of the first lens; a second spacer element located between a second lens and a third lens, which may abut against a non-optical region on the image-side side of the second lens; a third spacer element located between a third lens and a fourth lens, which may abut against a non-optical region on the image-side side of the third lens; a fourth spacer element located between a fourth lens and a fifth lens, which may abut against a non-optical region on the image-side side of the fourth lens; a fifth spacer element located between a fifth lens and a sixth lens, which may abut against a non-optical region on the image-side side of the fifth lens; a sixth spacer element located between a sixth lens and a seventh lens, which may abut against a non-optical region on the image-side side of the sixth lens; and a seventh spacer element located between a seventh lens and an eighth lens, which may abut against a non-optical region on the image-side side of the seventh lens. For example, the first spacer element may contact a non-optical region on the image side of the first lens, and simultaneously contact a non-optical region on the object side of the first lens. For instance, the object side of the first spacer element may contact a non-optical region on the image side of the first lens, the image side of the first spacer element may contact a non-optical region on the object side of the second lens, and so on, with the object side of the seventh spacer element contacting a non-optical region on the image side of the seventh lens, and the image side of the seventh spacer element contacting a non-optical region on the object side of the eighth lens.

[0043] An optical imaging lens according to an exemplary embodiment of this application may include eight spacer elements located on the image-side surfaces of the first lens to the eighth lens, namely a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, a seventh spacer element, and an eighth spacer element. Specifically, the optical imaging lens may include a first spacer element located between a first lens and a second lens, which abuts against a non-optical region on the image-side surface of the first lens; a second spacer element located between a second lens and a third lens, which abuts against a non-optical region on the image-side surface of the second lens; a third spacer element located between a third lens and a fourth lens, which abuts against a non-optical region on the image-side surface of the third lens; a fourth spacer element located between a fourth lens and a fifth lens, which abuts against a non-optical region on the image-side surface of the fourth lens; a fifth spacer element located between a fifth lens and a sixth lens, which abuts against a non-optical region on the image-side surface of the fifth lens; a sixth spacer element located between a sixth lens and a seventh lens, which abuts against a non-optical region on the image-side surface of the sixth lens; a seventh spacer element located between a seventh lens and an eighth lens, which abuts against a non-optical region on the image-side surface of the seventh lens; and an eighth spacer element located on the image-side surface of the eighth lens, which abuts against a non-optical region on the image-side surface of the eighth lens. Exemplarily, the first spacer element may contact both the non-optical region on the image-side surface of the first lens and the non-optical region on the object-side surface of the second lens. For example, the object-side surface of the first spacer element may contact the non-optical region of the image-side surface of the first lens, and the image-side surface of the first spacer element may contact the non-optical region of the object-side surface of the second lens; and so on, the object-side surface of the eighth spacer element may contact the non-optical region of the image-side surface of the eighth lens.

[0044] An optical imaging lens according to an exemplary embodiment of this application may include a lens barrel housing a first lens to an eighth lens. Exemplarily, such as... Figure 1A and Figure 1B As shown, the lens barrel can be a single piece used to house the first to eighth lenses.

[0045] According to an exemplary embodiment of this application, the spacer element may include at least one spacer plate. By reasonably setting the number, thickness, inner diameter, and outer diameter of the spacers, it is beneficial to improve the assembly of the optical imaging lens, to block stray light, and to improve the imaging quality of the optical imaging lens. Exemplarily, the spacer element may also include at least one spacer ring. By controlling the thickness and structure of the spacer ring, it is beneficial to improve the assembly stability of the optical imaging lens. Exemplarily, the eighth spacer element may include at least one pressure ring, which is beneficial to improve the stability of the assembled optical imaging lens and make the optical imaging lens reliable.

[0046] According to an exemplary embodiment of this application, the first lens may have positive optical power; the second lens may have negative optical power; the third lens may have positive optical power; the fourth lens may have positive or negative optical power; the fifth lens may have positive optical power; the sixth lens may have positive optical power; the seventh lens may have positive optical power; and the eighth lens may have negative optical power.

[0047] According to the exemplary embodiments of this application, by reasonably setting the optical power of each lens, it is beneficial to control the field curvature and astigmatism of the optical imaging lens, and also beneficial to reasonably control the deflection angle of the principal ray, thereby improving the matching degree between the lens and the chip.

[0048] According to an exemplary embodiment of this application, by providing a seventh spacer element between the seventh lens and the eighth lens, it is beneficial to balance the thickness of the non-optical regions of the seventh lens and the eighth lens, thereby improving assembly stability.

[0049] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 3.0 < EP12 / CT2 + f3 / d3s < 5.5, where CT2 is the center thickness of the second lens on the optical axis, f3 is the effective focal length of the third lens, EP12 is the spacing between the first and second spacers in the direction parallel to the optical axis, and d3s is the inner diameter of the object side of the third spacer. Satisfying 3.0 < EP12 / CT2 + f3 / d3s < 5.5 can reduce the angle between the light rays passing through the fourth lens and the optical axis, making the light rays more convergent and thus improving relative illumination. It can also allow excess light rays to be absorbed by the third spacer, reducing ghosting stray light caused by light leakage in the edge area of ​​the fourth lens. Furthermore, it can improve the surface smoothness of the second lens, reduce the interference effect of the assembly bearing surface, improve the lens bearing tightness, and thus improve stability.

[0050] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 5.0 < |f8 / (CP7-CT8)| < 19.0, where f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens on the optical axis, and CP7 is the maximum thickness of the seventh spacer element. Satisfying 5.0 < |f8 / (CP7-CT8)| < 19.0 ensures that the optical imaging lens has an ideal image plane while also having good image quality. Furthermore, it allows light passing through the seventh lens to uniformly enter the object-side surface of the eighth lens, preventing a sharp rise in light intensity that could cause a large separation between the seventh and eighth lenses, reducing the risk of stray light caused by a sharp rise in light intensity, and improving the image quality of the optical imaging lens.

[0051] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -10.0 < f2 / d2s < -2.0, where d2s is the inner diameter of the object-side surface of the second spacer element, and f2 is the effective focal length of the second lens. Satisfying -10.0 < f2 / d2s < -2.0 ensures that the incident light rays diverge after passing through the second and third lenses, and also reduces excess light entering the optical imaging lens, thereby reducing the risk of stray light and improving image quality.

[0052] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < f4 / d4s < 11.5, where f4 is the effective focal length of the fourth lens and d4s is the inner diameter of the object-side surface of the fourth spacer element. Satisfying 1.0 < f4 / d4s < 11.5 ensures that the incident light rays pass smoothly into the object-side surface of the fifth lens after passing through the fourth lens, while also reducing excess light entering the optical imaging lens, lowering the risk of stray light from the lens, and improving image quality.

[0053] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < f6 / d6s < 3.0, where d6s is the inner diameter of the object-side surface of the sixth spacer element, and f6 is the effective focal length of the sixth lens. Satisfying 1.0 < f6 / d6s < 3.0 ensures that the incident light rays pass smoothly into the object-side surface of the seventh lens after passing through the sixth lens, while also reducing stray light from dark objects, reducing excess light entering the rear lenses, lowering lens sensitivity, and improving image quality.

[0054] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 8.0 < f / (D1m-D1s+CP1) < 16.0, where D1m is the outer diameter of the image-side surface of the first spacer element, D1s is the outer diameter of the object-side surface of the first spacer element, f is the total effective focal length of the optical imaging lens, and CP1 is the maximum thickness of the first spacer element. Satisfying 8.0 < f / (D1m-D1s+CP1) < 16.0 can effectively reduce the incident light rays with poor edge quality on the image-side surface of the first lens and the useless light rays generated by reflections within the first lens, increasing the uniformity of light distribution in all directions on the image plane, and can also effectively reduce the risk of stray light generated by edge light rays emitted from the lens surface.

[0055] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < (D7m + d7m)) / (R14 - R13) < 84.0, where D7m is the outer diameter of the image-side surface of the seventh spacer element, d7m is the inner diameter of the image-side surface of the seventh spacer element, R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens. Satisfying 1.0 < (D7m + d7m)) / (R14 - R13) < 84.0 can effectively reduce the curvature of the seventh lens, reduce the molding risk and appearance risk of the seventh lens, and enable the optical imaging lens to maintain good performance under high temperature, high humidity and thermal shock conditions, greatly improving the overall stability of the lens.

[0056] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 2.0 < (f6 × CT3) / (d6s × EP23) < 6.5, where d6s is the inner diameter of the object-side surface of the sixth spacer element, EP23 is the spacing distance between the second and third spacer elements in the direction parallel to the optical axis, f6 is the effective focal length of the sixth lens, and CT3 is the center thickness of the third lens on the optical axis. Satisfying 2.0 < (f6 × CT3) / (d6s × EP23) < 6.5 can effectively improve the forming strength of the third lens, reduce the light refraction in the sixth lens, effectively reduce the distortion and aberration generated by the lens, and reduce the risk of stray light from the lens.

[0057] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < CT3 × CT4 / (EP34 × CP4) < 4.0, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, EP34 is the spacing between the third and fourth spacers in the direction parallel to the optical axis, and CP4 is the maximum thickness of the fourth spacer. Satisfying 1.0 < CT3 × CT4 / (EP34 × CP4) < 4.0 can minimize the lens sensitivity caused by the air gap between the fourth and fifth lenses, allowing the lens to maintain good performance under high temperature, high humidity, and thermal shock conditions. It also makes the central thickness of the lens more uniform, which is beneficial for lens shaping, reduces surface asymmetry, and thus obtains better imaging performance.

[0058] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 3.0 < |CP5 / (EP45-T45)| < 34.0, where CP5 is the maximum thickness of the fifth spacer element, EP45 is the spacing between the fourth and fifth spacers in the direction parallel to the optical axis, and T45 is the air gap between the fourth and fifth lenses on the optical axis. Satisfying 3.0 < |CP5 / (EP45-T45)| < 34.0 can minimize the lens sensitivity caused by the air gap between the fifth and sixth lenses, allowing the lens to maintain good performance under high temperature, high humidity, and thermal shock conditions. It also ensures a more uniform thickness in the middle of the lens, which is beneficial for lens shaping and thus achieves better imaging performance.

[0059] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 1.0 < (EP67 + CT6) / EP56 < 4.0, where CT6 is the center thickness of the sixth lens on the optical axis, EP56 is the spacing between the fifth and sixth spacers in the direction parallel to the optical axis, and EP67 is the spacing between the sixth and seventh spacers in the direction parallel to the optical axis. Satisfying 1.0 < (EP67 + CT6) / EP56 < 4.0 not only makes the center thickness of the lens more uniform, which is beneficial to lens forming, but also effectively controls the light path between the sixth and seventh lenses, reducing light energy loss caused by excessively steep light paths. It also improves assembly stability, reduces the generation of ghost images between the fifth and sixth lenses, reduces the eccentricity of the seventh lens, reduces stray light, and improves image quality.

[0060] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 6.0 < (D6m + f) / R11 < 12.5, where D6m is the outer diameter of the image-side surface of the sixth spacer element, R11 is the radius of curvature of the object-side surface of the sixth lens, and f is the total effective focal length of the optical imaging lens. Satisfying 6.0 < (D6m + f) / R11 < 12.5 can reduce the sensitivity of the sixth lens and achieve better imaging results.

[0061] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -4.5 < (R10 + R11) / D5s < 0, where R10 is the radius of curvature of the image-side surface of the fifth lens, R11 is the radius of curvature of the object-side surface of the sixth lens, and D5s is the outer diameter of the object-side surface of the fifth spacer element. Satisfying -4.5 < (R10 + R11) / D5s < 0 can reduce the risk of weld lines in the fifth lens, improve the smoothness of the fifth lens, reduce assembly tilt, improve the stability of the optical imaging lens, and increase the mass production yield of the lens.

[0062] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 4.5 < (L + CP1) / (T12 + EP12) < 8.5, where L is the maximum height of the lens barrel, CP1 is the maximum thickness of the first spacer element, T12 is the air gap between the first lens and the second lens on the optical axis, and EP12 is the distance between the first spacer element and the second spacer element in the direction parallel to the optical axis. Satisfying 4.5 < (L + CP1) / (T12 + EP12) < 8.5 helps to reduce eccentricity, reduce stray light, and improve image quality.

[0063] In an exemplary embodiment, the effective focal length f1 of the first lens can be in the range of 10mm to 13mm; the effective focal length f2 of the second lens can be in the range of -40mm to -10mm; the effective focal length f3 of the third lens can be in the range of 7mm to 16mm; the effective focal length f6 of the sixth lens can be in the range of 10mm to 35mm; and the effective focal length f8 of the eighth lens can be in the range of -8mm to -5mm; the total effective focal length f of the optical imaging lens can be in the range of 8mm to 9mm.

[0064] In an exemplary embodiment, the optical imaging lens according to this application further includes an aperture stop disposed between the first lens and the second lens. Optionally, the optical imaging lens may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. This application proposes an optical imaging lens with characteristics such as good assembly stability, high yield, low stray light, large image plane, miniaturization, and high imaging quality. 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, material, center thickness of each lens, and on-axis spacing between each lens, incident light can be effectively converged, the overall optical length of the imaging lens can be reduced, and the manufacturability of the imaging lens can be improved, making the optical imaging lens more conducive to production and processing. In the optical imaging lens of the above embodiments of this application, by reasonably setting the effective aperture and air gap of each lens, the lens as a whole can have a high MTF value, ensuring high pixel imaging quality of the lens; by reasonably setting the intermediate thickness of each lens, the step difference between each lens can be balanced to improve the overall assembly stability of the lens; by setting a spacer between adjacent lenses and designing the inner and outer diameters of the spacer according to the optical path, stray light can be effectively blocked and eliminated, improving the imaging quality of the lens.

[0065] In the embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the eighth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that its curvature changes continuously from the center to the periphery of the lens. Unlike a spherical lens, which has a constant curvature from the center to the periphery, an aspherical lens has better radius of curvature characteristics, and has the advantages of improving distortion aberrations and astigmatism aberrations. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses is an aspherical mirror surface. Optionally, both the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are aspherical mirror surfaces.

[0066] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. 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 desired, the optical imaging lens may also include other numbers of lenses. At least one spacer may be included between any two adjacent lenses.

[0067] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.

[0068] Example 1

[0069] The following is for reference Figures 1A to 2D Describes an optical imaging lens according to Embodiment 1 of this application. Figure 1A and Figure 1B The optical imaging lenses in two different implementations of Example 1 are shown respectively.

[0070] like Figure 1A and Figure 1B As shown, the optical imaging lens includes, in sequence from the object side to the image side: a first lens E1, an aperture stop STO (not shown), a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 (not shown), and an imaging surface S19 (not shown).

[0071] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0072] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0073]

[0074] Table 1

[0075] In this example, the total effective focal length f of the optical imaging lens is 8.790 mm.

[0076] like Figure 1A and Figure 1B As shown, the optical imaging lens may include a lens barrel housing a first lens to an eighth lens. The optical imaging lens may include seven spacer elements located between the first lens to the eighth lens, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7.

[0077] The first spacer element P1, the fourth spacer element P4, the fifth spacer element P5, and the seventh spacer element P7 may include spacers and spacers. By controlling the thickness and structure of the spacers and spacers, the assembly stability of the optical imaging lens can be improved. The second spacer element P2, the third spacer element P3, and the sixth spacer element P6 may include spacers. By setting appropriate spacers, stray light can be blocked, thus improving the imaging quality of the optical imaging lens.

[0078] Table 2 shows the basic parameters of each spacer element in two implementations of the optical imaging lens of Example 1.

[0079] Structural parameters Implementation Method 1 Implementation Method 2 D1m(mm) 5.225 5.465 D1s(mm) 5.080 5.191 d2s(mm) 5.369 5.369 CP1(mm) 0.800 0.800 d4s(mm) 7.014 7.014 d6s(mm) 11.117 11.117 CP7 (mm) 0.002 1.868 D7m (mm) 17.340 17.040 d7m(mm) 13.328 16.260 EP12(mm) 0.898 0.898 d3s(mm) 6.174 6.174 EP23(mm) 0.500 0.500 EP34(mm) 0.578 0.578 CP4 (mm) 1.150 1.150 CP5 (mm) 0.740 0.740 EP45(mm) 0.618 0.618 EP67(mm) 1.250 1.250 EP56(mm) 0.548 0.547 D6m (mm) 14.780 14.780 D5s(mm) 10.660 9.089 L(mm) 10.900 10.900

[0080] Table 2

[0081] It should be understood that this example only exemplifies the structure and parameters of each spacer element under two implementation methods, and does not explicitly limit the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0082] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0083]

[0084] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 3-1 and 3-2 below give the higher-order coefficients A4, A6, A8, A16, A26, A36, A47, A18, A19 ... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0085] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.4596E-02 5.9160E-03 1.1191E-03 1.3879E-04 -8.3075E-05 -1.3961E-04 -1.1720E-04 S2 -1.3323E-02 2.7005E-03 5.8094E-04 1.5249E-04 3.5840E-05 -7.6232E-06 1.0553E-05 S3 -3.8387E-01 1.6628E-02 5.0790E-04 -3.1569E-04 2.4281E-04 2.3515E-04 3.1640E-05 S4 -3.2133E-01 5.9699E-02 6.7549E-03 1.3023E-04 -1.6431E-04 -1.5664E-04 1.5874E-05 S5 -1.6141E-01 -1.2768E-02 1.2668E-02 5.5095E-03 5.9320E-04 -1.5253E-03 -9.1965E-04 S6 2.2829E-01 -7.1728E-02 9.0438E-03 -4.3032E-04 6.6840E-03 -1.7628E-03 1.4625E-04 S7 7.5660E-02 1.1037E-02 8.1632E-03 -2.5249E-03 -4.8238E-04 -4.8758E-04 1.8318E-03 S8 -1.2792E+00 5.8827E-02 3.7315E-03 1.7280E-02 -3.4186E-03 -4.3496E-04 -1.3697E-03 S9 -6.9680E-02 -1.1977E-01 3.8988E-02 -2.0945E-02 1.5214E-03 3.3559E-03 -6.2629E-04 S10 2.8140E-01 2.4898E-02 1.6841E-02 -2.2996E-02 8.7613E-03 1.6654E-03 -2.6649E-03 S11 -3.2769E+00 3.7087E-01 3.3221E-02 -3.0794E-02 2.0163E-02 5.8784E-03 -9.6447E-03 S12 -1.6854E+00 1.8551E-01 6.8844E-02 -1.1012E-01 4.8395E-02 3.2912E-03 -1.1309E-02 S13 -4.3369E+00 1.1171E+00 -4.4469E-02 -1.4971E-01 8.6692E-02 -3.4303E-02 -8.5913E-03 S14 -2.5227E+00 3.3929E-01 -2.4977E-01 1.2726E-02 9.6768E-02 -5.8764E-02 1.9085E-02 S15 -8.2168E-01 1.1562E+00 -7.1444E-01 3.7413E-01 -2.0403E-01 9.6515E-02 -6.6589E-02 S16 -1.0357E+01 2.9184E+00 -1.0461E+00 2.5256E-01 -1.7356E-01 1.0810E-01 -8.1546E-02

[0086] Table 3-1

[0087]

[0088]

[0089] Table 3-2

[0090] Figure 2A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2B The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 2DThe magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 2A to 2D It can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0091] Example 2

[0092] The following is for reference Figures 3A to 4D This paper describes an optical imaging lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments. Figure 3A and Figure 3B The optical imaging lenses in two different implementations of Example 2 are shown respectively.

[0093] like Figure 3A and Figure 3B As shown, the optical imaging lens includes, from the object side to the image side, the following components in sequence: first lens E1, aperture stop STO (not shown), second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9 (not shown), and imaging surface S19 (not shown).

[0094] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0095] In this example, the total effective focal length f of the optical imaging lens is 8.800 mm.

[0096] like Figure 3A and Figure 3BAs shown, the optical imaging lens may include a lens barrel housing a first lens to an eighth lens. The optical imaging lens may include seven spacer elements located between the first lens to the eighth lens, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7.

[0097] The first spacer element P1, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, the sixth spacer element P6, and the seventh spacer element P7 may include spacers and spacers. By controlling the thickness and structure of the spacers and spacers, it is beneficial to improve the assembly stability of the optical imaging lens. The second spacer element P2 may include a spacer; by setting an appropriate spacer, it is beneficial to block stray light and improve the imaging quality of the optical imaging lens.

[0098] It should be understood that this example only exemplifies the structure and parameters of each spacer element under two implementation methods, and does not explicitly limit the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0099] Table 4 shows the basic parameters of the optical imaging lens of Embodiment 2, wherein the units of radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 5 shows the basic parameters of each spacer element in the two implementations of the optical imaging lens of Embodiment 2. Tables 6-1 and 6-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0100]

[0101] Table 4

[0102]

[0103]

[0104] Table 5

[0105] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.5648E-02 -1.2342E-03 -1.2660E-03 -1.1233E-03 -8.8115E-04 -4.6992E-04 -2.3246E-04 S2 -3.0948E-02 -7.1936E-04 -1.3272E-03 -9.9665E-04 -3.7957E-04 3.7987E-05 2.9993E-04 S3 -2.3522E-01 3.0107E-02 -3.7462E-03 3.7587E-04 -2.1737E-04 6.7655E-05 -2.8095E-05 S4 -1.4295E-01 3.9702E-02 -7.5748E-04 1.1641E-03 -1.9701E-04 4.5715E-05 4.5683E-05 S5 -1.1734E-01 -1.0055E-02 4.1852E-03 1.8273E-03 3.4165E-04 -1.8206E-04 1.5839E-04 S6 -6.0544E-02 -1.2108E-02 1.8526E-02 3.0755E-03 3.5575E-03 -1.5581E-03 5.0329E-04 S7 -9.1872E-02 -1.2757E-02 5.5608E-03 -1.3807E-03 4.7747E-03 -3.5148E-04 4.7869E-04 S8 -4.0180E-01 -4.9230E-02 -4.5471E-03 9.1194E-03 5.5018E-04 2.2378E-03 -2.3938E-04 S9 -1.8801E-01 -9.5915E-02 7.9241E-03 4.5034E-05 -2.5114E-03 2.8379E-03 -4.2364E-04 S10 -1.6638E-01 5.1810E-02 1.8679E-02 -1.8927E-02 2.3395E-03 2.7124E-03 -6.8183E-05 S11 -2.2160E+00 9.3956E-02 2.2507E-03 1.0628E-02 8.9235E-03 4.7078E-03 -1.9125E-03 S12 -1.1415E+00 -1.0834E-01 7.2641E-02 -1.3228E-02 6.0307E-03 2.8951E-03 -4.4253E-03 S13 -3.5909E+00 6.7477E-01 7.2064E-02 -1.5161E-01 1.4901E-02 1.7802E-02 3.2456E-03 S14 -2.3434E+00 1.1498E-01 1.2677E-01 -8.3537E-02 3.3170E-02 -3.0663E-02 5.5369E-03 S15 -1.7256E+00 1.5539E+00 -9.3439E-01 5.8536E-01 -2.9569E-01 1.3022E-01 -5.4545E-02 S16 -1.0533E+01 2.4385E+00 -1.2691E+00 3.5679E-01 -2.4988E-01 1.3268E-01 -3.4306E-02

[0106] Table 6-1

[0107]

[0108]

[0109] Table 6-2

[0110] Figure 4AThe on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 4A to 4D It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0111] Example 3

[0112] The following is for reference Figures 5A to 6D Describes an optical imaging lens according to Embodiment 3 of this application. Figure 5A and Figure 5B The optical imaging lenses in two different implementations of Example 3 are shown respectively.

[0113] like Figure 5A and Figure 5B As shown, the optical imaging lens includes, from the object side to the image side, the following components in sequence: first lens E1, aperture stop STO (not shown), second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9 (not shown), and imaging surface S19 (not shown).

[0114] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0115] In this example, the total effective focal length f of the optical imaging lens is 8.737 mm.

[0116] like Figure 5Aand Figure 5B As shown, the optical imaging lens may include a lens barrel housing a first lens to an eighth lens. The optical imaging lens may include seven spacer elements located between the first lens to the eighth lens, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7.

[0117] The first spacer element P1, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, and the seventh spacer element P7 may include spacers and spacers. By controlling the thickness and structure of the spacers and spacers, it is beneficial to improve the assembly stability of the optical imaging lens. The second spacer element P2 and the sixth spacer element P6 may include spacers. By setting appropriate spacers, it is beneficial to block stray light and improve the imaging quality of the optical imaging lens.

[0118] It should be understood that this example only exemplifies the structure and parameters of each spacer element under two implementation methods, and does not explicitly limit the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0119] Table 7 shows the basic parameters of the optical imaging lens of Embodiment 3, wherein the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Table 8 shows the basic parameters of each spacer element in the two embodiments of the optical imaging lens of Embodiment 3. Tables 9-1 and 9-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0120]

[0121] Table 7

[0122]

[0123]

[0124] Table 8

[0125]

[0126]

[0127] Table 9-1

[0128] Face number A18 A20 A22 A24 A26 A28 A30 S1 7.2810E-07 -7.5457E-06 -8.1349E-06 -8.0483E-06 -4.4247E-06 -2.7422E-06 0.0000E+00 S2 -2.3801E-05 -1.7327E-05 -1.7658E-05 -9.0146E-06 -7.2153E-06 4.8829E-07 0.0000E+00 S3 2.1667E-05 -6.5238E-06 -2.6209E-07 -2.9321E-06 2.6483E-06 1.0009E-06 0.0000E+00 S4 6.3947E-05 -4.8072E-06 1.0478E-05 -6.3896E-06 -2.4862E-08 -8.9836E-07 0.0000E+00 S5 2.9757E-05 1.8865E-05 4.2004E-06 -1.8235E-06 -1.5462E-06 2.5559E-06 0.0000E+00 S6 -2.3732E-04 3.2151E-05 -1.2859E-04 3.2838E-05 -2.8009E-05 1.8205E-05 0.0000E+00 S7 -4.0480E-04 -1.2126E-04 -2.0995E-04 6.1424E-05 -3.9564E-05 3.3766E-05 0.0000E+00 S8 5.8043E-05 -2.0823E-04 -2.3007E-04 -1.2994E-05 -6.0030E-05 8.4228E-06 0.0000E+00 S9 6.9805E-04 -3.0463E-04 3.6601E-05 8.6140E-05 -5.1490E-06 1.6767E-05 0.0000E+00 S10 7.8933E-04 -3.0814E-04 1.9173E-04 5.5874E-05 -1.0637E-05 -2.5131E-06 0.0000E+00 S11 -1.0096E-03 -2.6286E-04 -2.5102E-04 4.5127E-04 -1.7947E-04 7.5335E-05 0.0000E+00 S12 2.7511E-04 -1.2972E-03 9.6974E-04 1.4539E-04 -2.6981E-04 9.3856E-05 0.0000E+00 S13 -5.6055E-03 2.0026E-03 1.8539E-03 -1.2726E-03 6.1652E-05 4.6971E-04 -3.2425E-04 S14 -6.6717E-03 -1.2600E-04 1.3714E-03 9.7503E-04 1.5978E-03 -2.9006E-04 -1.2444E-03 S15 4.4282E-03 -2.6031E-03 5.3612E-03 -1.0685E-03 -2.1150E-03 8.0391E-04 0.0000E+00 S16 8.7976E-03 -8.9140E-03 3.6691E-03 4.1596E-04 -7.0681E-04 1.2931E-04 7.5220E-04

[0129] Table 9-2

[0130] Figure 6AThe on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 6B 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 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 6D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6A to 6D It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0131] Example 4

[0132] The following is for reference Figures 7A to 8D The optical imaging lens according to Embodiment 4 of this application is described. Figure 7A and Figure 7B The optical imaging lenses in two different implementations of Example 4 are shown respectively.

[0133] like Figure 7A and Figure 7B As shown, the optical imaging lens includes, from the object side to the image side, the following components in sequence: first lens E1, aperture stop STO (not shown), second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9 (not shown), and imaging surface S19 (not shown).

[0134] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0135] In this example, the total effective focal length f of the optical imaging lens is 8.797 mm.

[0136] like Figure 7Aand Figure 7B As shown, the optical imaging lens may include a lens barrel housing a first lens to an eighth lens. The optical imaging lens may include seven spacer elements located between the first lens to the eighth lens, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7.

[0137] The first spacer element P1, the fourth spacer element P4, the fifth spacer element P5, and the seventh spacer element P7 may include spacers and spacers. By controlling the thickness and structure of the spacers and spacers, the assembly stability of the optical imaging lens can be improved. The second spacer element P2, the third spacer element P3, and the sixth spacer element P6 may include spacers. By setting appropriate spacers, stray light can be blocked, thus improving the imaging quality of the optical imaging lens.

[0138] It should be understood that this example only exemplifies the structure and parameters of each spacer element under two implementation methods, and does not explicitly limit the specific structure and actual parameters of each spacer element. In actual production, the specific structure and actual parameters of each spacer element can be set in any suitable manner.

[0139] Table 10 shows the basic parameters of the optical imaging lens of Embodiment 4, wherein the units for radius of curvature, thickness / distance, and focal length are millimeters (mm). Table 11 shows the basic parameters of each spacer element in the two embodiments of the optical imaging lens of Embodiment 4. Tables 12-1 and 12-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 4, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0140]

[0141]

[0142] Table 10

[0143] Structural parameters Implementation Method 1 Implementation Method 2 D1m(mm) 5.107 5.507 D1s(mm) 4.970 5.370 d2s(mm) 4.260 4.260 CP1(mm) 0.440 0.440 d4s(mm) 6.047 6.047 d6s(mm) 9.537 11.082 CP7 (mm) 1.350 1.400 D7m (mm) 16.920 16.920 d7m(mm) 16.278 16.278 EP12(mm) 0.438 0.438 d3s(mm) 5.145 5.184 EP23(mm) 0.900 0.800 EP34(mm) 0.770 0.708 CP4 (mm) 0.305 0.305 CP5 (mm) 1.740 1.740 EP45(mm) 0.558 0.558 EP67(mm) 1.300 1.250 EP56(mm) 0.968 0.968 D6m (mm) 12.700 14.620 D5s(mm) 8.739 8.739 L(mm) 10.900 10.900

[0144] Table 11

[0145]

[0146]

[0147] Table 12-1

[0148] Face number A18 A20 A22 A24 A26 A28 A30 S1 -7.2069E-05 -2.8557E-05 -6.9313E-06 7.1138E-07 1.3710E-06 -4.5743E-07 0.0000E+00 S2 -2.7432E-05 1.1321E-06 4.2459E-06 7.9574E-06 5.4197E-06 5.5242E-06 0.0000E+00 S3 -7.6032E-06 -1.4851E-06 2.2198E-06 9.5695E-07 9.7637E-07 -1.0133E-06 0.0000E+00 S4 -1.6724E-05 -9.9570E-06 -6.0992E-06 -2.7853E-06 -4.2272E-07 -1.7184E-07 0.0000E+00 S5 -3.0285E-05 -2.3845E-05 -1.6122E-05 -9.9290E-06 -4.6090E-06 -2.5719E-06 0.0000E+00 S6 -1.3272E-04 2.7865E-05 -1.5873E-05 9.8211E-06 4.8845E-07 6.7041E-06 0.0000E+00 S7 -9.6303E-05 4.8077E-05 -1.0608E-05 6.3025E-06 1.5684E-06 5.2184E-06 0.0000E+00 S8 4.3412E-04 -1.3436E-04 7.5643E-05 -3.5710E-05 1.0637E-05 -6.0787E-06 0.0000E+00 S9 6.0852E-04 -3.9491E-04 2.0432E-05 -9.8186E-05 1.2424E-06 -1.2337E-05 0.0000E+00 S10 -1.9646E-04 -3.4515E-04 1.4392E-05 3.4361E-06 1.7755E-05 -9.7844E-06 0.0000E+00 S11 -9.4376E-04 -3.4341E-04 -5.5851E-05 1.6265E-04 -4.4895E-05 -2.1658E-05 0.0000E+00 S12 7.9036E-04 -1.4033E-04 1.0045E-04 -3.2618E-05 -1.5003E-04 5.3610E-05 0.0000E+00 S13 -6.1370E-03 9.9035E-04 4.4765E-04 3.9180E-04 8.3304E-05 -3.0989E-04 2.2210E-06 S14 -7.2079E-03 5.0961E-03 -2.3826E-03 2.3844E-04 -9.8598E-04 1.5908E-04 3.6564E-04 S15 2.0697E-02 -8.3060E-05 -4.4550E-03 1.2724E-03 -1.1439E-03 5.9216E-04 0.0000E+00 S16 7.3215E-03 -6.9893E-03 3.6851E-03 1.9937E-03 -7.4981E-04 1.3326E-04 -9.4068E-05

[0149] Table 12-2

[0150] Figure 8AThe on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 8B The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 8D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 8A to 8D It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0151] In summary, Examples 1 to 4 satisfy the relationships shown in Tables 13-1 and 13-2, respectively.

[0152]

[0153] Table 13-1

[0154]

[0155] Table 13-2

[0156] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0157] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: The first lens with positive optical power has a convex object side and a concave image side. A second lens with negative optical power has a concave image-side surface; The third lens with positive optical power has a convex image-side surface; A fourth lens with optical power; The fifth lens with positive optical power has a concave object side and a convex image side. The sixth lens with positive optical power has a convex object side and a concave image side. A seventh lens with positive optical power, its object-side surface is convex, and its image-side surface is concave; and The eighth lens, which has negative optical power, has a convex object side and a concave image side. The optical imaging lens also includes: A first spacer element located between the first lens and the second lens; A second spacer element located between the second lens and the third lens; and A third spacer element located between the third lens and the fourth lens; A sixth spacer element located between the sixth lens and the seventh lens; The optical imaging lens satisfies the following conditions: 3.456≤EP12 / CT2+f3 / d3s≤5.209, 1.057≤f6 / d6s≤2.694, and -9.254≤f2 / d2s≤-2.205, where CT2 is the center thickness of the second lens on the optical axis, f3 is the effective focal length of the third lens, EP12 is the spacing between the first and second spacers in a direction parallel to the optical axis, d3s is the inner diameter of the object-side surface of the third spacer, d6s is the inner diameter of the object-side surface of the sixth spacer, f6 is the effective focal length of the sixth lens, d2s is the inner diameter of the object-side surface of the second spacer, and f2 is the effective focal length of the second lens; and The optical imaging lens has eight lenses with optical power.

2. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes a seventh spacer element located between the seventh lens and the eighth lens. The optical imaging lens satisfies: 5.321≤|f8 / (CP7-CT8)|≤18.565, where f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens on the optical axis, and CP7 is the maximum thickness of the seventh spacer element.

3. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens further includes a fourth spacer element located between the fourth lens and the fifth lens. The optical imaging lens satisfies: 1.076≤|f4 / d4s|≤11.088, where f4 is the effective focal length of the fourth lens and d4s is the inner diameter of the object side of the fourth spacer element.

4. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 8.184≤f / (D1m-D1s+CP1)≤15.252, where D1m is the outer diameter of the image side of the first spacer element, D1s is the outer diameter of the object side of the first spacer element, f is the total effective focal length of the optical imaging lens, and CP1 is the maximum thickness of the first spacer element.

5. The optical imaging lens according to claim 3, characterized in that, The optical imaging lens satisfies: 1.301≤(D7m+d7m)) / (R14-R13)≤83.941, where D7m is the outer diameter of the image-side surface of the seventh spacer element, d7m is the inner diameter of the image-side surface of the seventh spacer element, R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens.

6. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 2.600≤(f6×CT3) / (d6s×EP23)≤4.567, where d6s is the inner diameter of the object side of the sixth spacer element, EP23 is the spacing distance between the second spacer element and the third spacer element in the direction parallel to the optical axis, f6 is the effective focal length of the sixth lens, and CT3 is the center thickness of the third lens on the optical axis.

7. The optical imaging lens according to claim 3, characterized in that, The optical imaging lens satisfies: 1.051≤CT3×CT4 / (EP34×CP4)≤3.559, where CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, EP34 is the spacing distance between the third spacer element and the fourth spacer element in the direction parallel to the optical axis, and CP4 is the maximum thickness of the fourth spacer element.

8. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens further includes a fifth spacer element located between the fifth lens and the sixth lens. The optical imaging lens satisfies: 3.319≤|CP5 / (EP45-T45)|≤33.783, where CP5 is the maximum thickness of the fifth spacer element, EP45 is the distance between the fourth and fifth spacers element in the direction parallel to the optical axis, and T45 is the air gap between the fourth and fifth lenses on the optical axis.

9. The optical imaging lens according to claim 8, characterized in that, The optical imaging lens satisfies: 1.418≤(EP67+CT6) / EP56≤3.749, where CT6 is the center thickness of the sixth lens on the optical axis, EP56 is the spacing distance between the fifth and sixth spacers in the direction parallel to the optical axis, and EP67 is the spacing distance between the sixth and seventh spacers in the direction parallel to the optical axis.

10. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 6.0 < (D6m + f) / R11 ≤ 12.147, where D6m is the outer diameter of the image side of the sixth spacer element, R11 is the radius of curvature of the object side of the sixth lens, and f is the total effective focal length of the optical imaging lens.

11. The optical imaging lens according to claim 8, characterized in that, The optical imaging lens satisfies: -4.302≤(R10+R11) / D5s≤-0.469, where R10 is the radius of curvature of the image side of the fifth lens, R11 is the radius of curvature of the object side of the sixth lens, and D5s is the outer diameter of the object side of the fifth spacer element.

12. The optical imaging lens according to any one of claims 1-11, characterized in that, The optical imaging lens also includes a lens barrel for housing the first lens to the eighth lens. The optical imaging lens satisfies: 4.867≤(L+CP1) / (T12+EP12)<8.5, where L is the maximum height of the lens barrel, CP1 is the maximum thickness of the first spacer element, T12 is the air gap between the first lens and the second lens on the optical axis, and EP12 is the distance between the first spacer element and the second spacer element in the direction parallel to the optical axis.

Images