Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, a lens set and a plurality of spacer elements accommodated in the lens barrel, and the outer surface of the lens barrel comprises at least one conical surface; the lens set comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis, wherein the third lens and the fourth lens have positive and negative refractive powers opposite in sign, and the thickness of the sixth lens along the direction parallel to the optical axis increases first and then decreases from the paraxial region to the faraxial region; the plurality of spacer elements comprises a second spacer element located on the image side of the second lens and in contact with the image side surface of the second lens, and a fourth spacer element located on the image side of the fourth lens and in contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element and the inner diameter d2m of the image side surface of the second spacer element satisfy: 0<|f4 / f3|×((D4s-d2m) / d2m)<9.0.

Description

Technical Field

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

[0002] As people's demands for mobile phone photography continue to rise, the industry is also placing increasingly higher requirements on optical imaging lenses. While demanding improved performance, it's also crucial to maintain the stability of lens production.

[0003] Taking the widely used six-element lens as an example, the stability of its assembly performance is becoming increasingly prominent. The structural assembly and optical stability issues of the second, third, and fourth elements are particularly severe. Often, poor matching or design of the optical parameters or structural dimensions of some components prevents the fulfillment of assembly requirements, affecting the amount of light entering the system, impacting the adjustment of coma, and causing the lens to fail to achieve the expected imaging results. Furthermore, during assembly, problems such as optical elements not accurately passing through the fitting space within the lens barrel and light obstruction can occur, negatively impacting assembly yield and hindering the improvement of lens image quality.

[0004] Therefore, given the current situation, how to effectively improve or overcome the above problems by optimizing the optical and structural parameters of system components such as lenses, spacers, and lens barrels, so as to effectively improve the stability of lens assembly performance, has become one of the technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides an optical imaging lens, which may include a lens barrel and a lens group and a plurality of spacer elements housed within the lens barrel. The outer annular surface of the lens barrel includes at least one conical annular surface; the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side along the optical axis, wherein the third lens and the fourth lens have opposite optical powers, and the thickness of the sixth lens increases from the paraxial direction to the faraxial direction; the plurality of spacer elements may include a second spacer element located on the image side of the second lens and in contact with the image side surface of the second lens, and a fourth spacer element located on the image side of the fourth lens and in contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d2m of the image side surface of the second spacer element can satisfy: 0 < |f4 / f3|×((D4s-d2m) / d2m) < 9.0.

[0006] In one embodiment, the effective focal length f5 of the fifth lens, the outer diameter D4m of the image-side surface of the fourth spacer element, and the inner diameter d4s of the object-side surface of the fourth spacer element can satisfy: 2.0 <f5 / (D4m-d4s)<10。

[0007] In one embodiment, the plurality of spacer elements may further include a sixth spacer element located on the image side of the sixth lens and in contact with the image side surface of the sixth lens; the effective focal length f6 of the sixth lens, the inner diameter d0m of the image side end face of the lens barrel, and the minimum inner diameter d6 of the sixth spacer element may satisfy: -5.0 <f6 / (d0m-d6)<-2.0。

[0008] In one embodiment, the plurality of spacers may further include a first spacer located on the image side of the first lens and in contact with the image side of the first lens; the aperture coefficient Fno of the optical imaging lens, the distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer along the optical axis, and the inner diameter d1s of the object side face of the first spacer may satisfy: 5.0≤Fno / (EP01 / d1s)<8.0.

[0009] In one embodiment, the effective focal length f1 of the first lens, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis can satisfy: 4.0 <f1 / (EP01-T12)<7.5。

[0010] In one embodiment, the radius of curvature R4 of the image side of the second lens, the radius of curvature R8 of the image side of the fourth lens, and the distance EP24 from the image side of the second spacer element to the object side of the fourth spacer element along the optical axis can satisfy: 15 < (R4 - R8) / EP24 ≤ 55.

[0011] In one embodiment, the effective focal length f2 of the second lens, the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis can satisfy: -60 <f2 / (EP12-T23)<-30。

[0012] In one embodiment, the radius of curvature R2 of the image side of the first lens, the radius of curvature R4 of the image side of the second lens, the air gap T12 between the first lens and the second lens on the optical axis, and the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis can satisfy: 20 < (R2 + R4) / (T12 + EP12) < 30.

[0013] In one embodiment, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element may satisfy: 1.5 < (R2 - R1) / (D1m - d1s) < 5.0.

[0014] In one embodiment, among the first lens to the fifth lens, the i-th lens has a negative optical power, the i-th spacer element is a spacer element located on the image side of the i-th lens and in contact with the image side surface of the i-th lens, and the effective focal length fi of the i-th lens and the outer diameter Dis of the object side surface of the i-th spacer element may satisfy: -35 < fi / Dis < -1.0, where i is taken from 1, 2, 3, 4, 5.

[0015] In one embodiment, half of the maximum field angle Semi-FOV of the optical imaging lens, the outer diameter D4s of the object side surface of the fourth spacer element, the outer diameter D0s of the object side end surface of the lens barrel, and the outer diameter D0m of the image side end surface of the lens barrel may satisfy: 0.9 < Tan(Semi-FOV) / ((D4s - D0s) / (D0m - D4s)) < 4.5.

[0016] In one embodiment, the effective focal length f1 of the first lens and the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis may satisfy: 3.5 < f1 / EP01 < 6.0.

[0017] In one embodiment, three of the lenses from the first lens to the sixth lens have positive optical power, and the remaining three lenses have negative optical power.

[0018] In one embodiment, for the first lens, the fourth lens, and the fifth lens, the radius of curvature of their respective object side surfaces and the radius of curvature of their respective image side surfaces are both two values with the same positive or negative sign.

[0019] The optical imaging lens provided in this application includes a six-element imaging lens group, multiple spacer elements, and a lens barrel. The first to sixth lenses are arranged sequentially from the object side to the image side along the optical axis. The third and fourth lenses have opposite optical powers. The thickness of the sixth lens increases from the paraxial direction to the distal axis and then decreases. The outer ring surface of the lens barrel includes at least one conical ring surface. The image side of the second lens is provided with a second spacer element that contacts its image side surface. The image side of the fourth lens is provided with a fourth spacer element that contacts its image side surface. The effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy the condition 0 < |f4 / f3| × ((D4s-d2m) / d2m) < 9.0. This application, through its arrangement of the optical imaging lens, ensures that the system has a completely sufficient amount of light after passing through the second and third lenses. Furthermore, while meeting imaging requirements, the lens also ensures that each component can accurately pass through the fitting space between the optical barrels during assembly, which is beneficial to the stable assembly performance of the third lens, fourth lens, and fourth spacer element. In addition, it allows the lens to have sufficient space for system coma adjustment and prevents the second spacer element, third and fourth lenses from blocking light during assembly, which is beneficial to improving the lens's imaging quality and yield. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0021] Figure 1 A schematic diagram showing the structure and some parameters of an optical imaging lens according to an exemplary embodiment of this application is provided;

[0022] Figure 2 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 1 of this application is shown;

[0023] Figures 3 to 5 Schematic diagrams of the optical imaging lens according to Embodiment 1 of this application are shown in three different embodiments.

[0024] Figures 6 to 9 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.

[0025] Figure 10 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 2 of this application is shown;

[0026] Figures 11 to 13Schematic diagrams of the optical imaging lens according to Embodiment 2 of this application are shown in three different embodiments.

[0027] Figures 14 to 17 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.

[0028] Figure 18 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 3 of this application is shown;

[0029] Figures 19 to 21 Schematic diagrams of the optical imaging lens according to Embodiment 3 of this application are shown in three different embodiments.

[0030] Figures 22 to 25 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.

[0031] Figure 26 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 4 of this application is shown;

[0032] Figures 27 to 29 Schematic diagrams of the optical imaging lens according to Embodiment 4 of this application are shown in three different embodiments; and

[0033] Figures 30 to 33 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. Detailed Implementation

[0034] 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.

[0035] 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.

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

[0037] In this paper, 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 shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, 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. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0038] 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.

[0039] 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 a 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.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

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

[0042] An optical imaging lens according to an exemplary embodiment of this application may include a lens barrel and a lens group and a plurality of spacer elements mounted within the lens barrel. The lens group may be a six-element lens group, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. The plurality of spacer elements may include a second spacer element located on the image side of the second lens and in contact with the image side surface of the second lens, and a fourth spacer element located on the image side of the fourth lens and in contact with the image side surface of the fourth lens.

[0043] In an exemplary embodiment, the third lens and the fourth lens may have opposite optical powers.

[0044] In an exemplary embodiment, the thickness of the sixth lens along the direction parallel to the optical axis gradually increases and then gradually decreases from the near axis to the far axis. Here, the near axis refers to the position or region close to the optical axis, and the far axis refers to the position or region far from the optical axis. That is, from the position close to the optical axis to the position far from the optical axis, the thickness of the sixth lens along the direction parallel to the optical axis shows a trend of first increasing and then decreasing.

[0045] In an exemplary embodiment, the outer annular surface of the lens barrel includes at least one conical annular surface. The lens barrel may have an object-side end face, an image-side end face, an inner annular surface, and an outer annular surface, wherein the outer annular surface of the lens barrel may include, for example, one or more conical annular surfaces.

[0046] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition 0<|f4 / f3|×((D4s-d2m) / d2m)<9.0, where f4 is the effective focal length of the fourth lens, f3 is the effective focal length of the third lens, D4s is the outer diameter of the object side of the fourth spacer element, and d2m is the inner diameter of the image side of the second spacer element.

[0047] The optical imaging lens provided by the present application includes a lens barrel and a lens group and multiple spacer elements assembled in the lens barrel. Among them, the lens group includes the first to sixth lenses arranged in sequence from the object side to the image side along the optical axis. Moreover, the third lens and the fourth lens have opposite positive and negative optical powers, and the thickness of the sixth lens along the direction parallel to the optical axis first increases and then decreases from the paraxial region to the marginal region; the outer ring surface of the lens barrel includes at least one conical toroidal surface; and, a second spacer element is disposed on the image side of the second lens and contacts its image side surface, a fourth spacer element is disposed on the image side of the fourth lens and contacts its image side surface, and the effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy the conditional formula 0 < |f4 / f3| × ((D4s - d2m) / d2m) < 9.0. Such a setting of the optical imaging lens provided by the present application can ensure that after the light passes through the second lens and the third lens, the system has a completely sufficient light input; and, while satisfying the imaging effect, it can also ensure that during the assembly process, there is a fitting space between the optical lens barrels that allows each element to pass precisely, which is beneficial to the stable assembly performance of the third lens, the fourth lens, and the fourth spacer element; and, it can provide enough space for the system coma adjustment of the lens, and can also prevent the second spacer element, the third and fourth lenses, etc. from blocking light during the assembly process, which is beneficial to the improvement of the imaging quality and yield rate of the lens.

[0048] In an exemplary embodiment, the multiple spacer elements may further include: a first spacer element located on the image side of the first lens and contacting the image side surface of the first lens; a third spacer element located on the image side of the third lens and contacting the image side surface of the third lens; a fifth spacer element located on the image side of the fifth lens and contacting the image side surface of the fifth lens; and a sixth spacer element located on the image side of the sixth lens and contacting the image side surface of the sixth lens.

[0049] In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional formula 2.0 < f5 / (D4m - d4s) < 10, where f5 is the effective focal length of the fifth lens, D4m is the outer diameter of the image side surface of the fourth spacer element, and d4s is the inner diameter of the object side surface of the fourth spacer element. By controlling the ratio of the effective focal length of the fifth lens to the difference between the outer diameter of the image side surface of the fourth spacer element and the inner diameter of the object side surface of the fourth spacer element within this range, the light intensity of the off-axis field can be controlled, the rationality of the structure can be ensured, and the space of the lens in the lens barrel can be reduced, which is beneficial to adapting to different lenses. At the same time, it can also perform paired correction on the positive axis aberration part and improve the imaging quality of the entire system.

[0050] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula -5.0 < f6 / (d0m - d6) < -2.0, where f6 is the effective focal length of the sixth lens, d0m is the inner diameter of the image-side end face of the lens barrel, and d6 is the minimum inner diameter of the sixth spacer element. By controlling the ratio of the effective focal length of the sixth lens to the difference between the inner diameter of the image-side end face of the lens barrel and the minimum inner diameter of the sixth spacer element within this range, the central axis distance between the sixth lens and the lenses at the front end face can be reduced during the assembly process, effectively ensuring the central optical axis of each lens and improving the imaging quality of the system.

[0051] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 5.0 ≤ Fno / (EP01 / d1s) < 8.0, where Fno is the aperture coefficient of the optical imaging lens, EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and d1s is the inner diameter of the object-side surface of the first spacer element. By controlling the aperture coefficient of the optical imaging lens, the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and the inner diameter of the object-side surface of the first spacer element to satisfy the conditional formula 5.0 ≤ Fno / (EP01 / d1s) < 8.0, the relationship between the field angle and the light passing aperture size of the lens barrel can be reasonably ensured, the cooperation degree between the lens and the chip can be improved, the sensitivity of the rear-end lenses of the imaging system can be reduced, and production can be more effectively stabilized.

[0052] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 4.0 < f1 / (EP01 - T12) < 7.5, where f1 is the effective focal length of the first lens, EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis. By controlling the ratio of the effective focal length of the first lens to the difference between the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element and the air gap between the first lens and the second lens on the optical axis within this range, the imaging system can meet the requirements of optical performance, ensure the imaging quality, and avoid the reflection of excess light within the effective diameter to form stray light.

[0053] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 15 < (R4 - R8) / EP24 ≤ 55, where R4 is the radius of curvature of the image-side surface of the second lens, R8 is the radius of curvature of the image-side surface of the fourth lens, and EP24 is the distance along the optical axis from the image-side surface of the second spacer element to the object-side surface of the fourth spacer element. By controlling the ratio of the difference between the radius of curvature of the image-side surface of the second lens and the radius of curvature of the image-side surface of the fourth lens to the distance along the optical axis from the image-side surface of the second spacer element to the object-side surface of the fourth spacer element within this range, the deflection angle of the external field surface can be reasonably controlled, and the fault tolerance distance of the system can be effectively increased within a certain range, reducing the sensitivity of the system.

[0054] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula -60 < f2 / (EP12 - T23) < -30, where f2 is the effective focal length of the second lens, EP12 is the distance along the optical axis from the image side of the first spacer element to the object side of the second spacer element, and T23 is the air gap between the second lens and the third lens on the optical axis. By controlling the ratio of the effective focal length of the second lens to the difference between the distance along the optical axis from the image side of the first spacer element to the object side of the second spacer element and the air gap between the second lens and the third lens on the optical axis within this range, within the focal length that meets the requirements of each lens, the aberration of the front-end optical lens can be controlled, so that the system aberration meets the design requirements, and the edge thicknesses of the second lens and the third lens can be controlled to show a good state in terms of the stability of the structure and assembly.

[0055] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 20 < (R2 + R4) / (T12 + EP12) < 30, where R2 is the radius of curvature of the image side of the first lens, R4 is the radius of curvature of the image side of the second lens, T12 is the air gap between the first lens and the second lens on the optical axis, and EP12 is the distance along the optical axis from the image side of the first spacer element to the object side of the second spacer element. By controlling the ratio of the sum of the radius of curvature of the image side of the first lens and the radius of curvature of the image side of the second lens to the sum of the air gap between the first lens and the second lens on the optical axis and the distance along the optical axis from the image side of the first spacer element to the object side of the second spacer element within this range, for the control of the entrance pupil diameter, ensuring that when the depth of field and illuminance required by the aperture are both satisfied, the structural space of the lens can be effectively reduced, and there is more space for correcting off-axis aberrations, which is beneficial to improving the imaging quality of the system.

[0056] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 1.5 < (R2 - R1) / (D1m - d1s) < 5.0, where R2 is the radius of curvature of the image side of the first lens, R1 is the radius of curvature of the object side of the first lens, D1m is the outer diameter of the image side of the first spacer element, and d1s is the inner diameter of the object side of the first spacer element. By controlling the ratio of the difference between the radius of curvature of the image side of the first lens and the radius of curvature of the object side of the first lens to the difference between the outer diameter of the image side of the first spacer element and the inner diameter of the object side of the first spacer element within this range, it is beneficial to control the imaging quality of the light passing through the first lens and the second lens, and can make the light angle of the field of view within a reasonable range, and reduce its sensitivity.

[0057] In an exemplary embodiment, the i-th lens among the first lens to the fifth lens has a negative optical power, and an i-th spacer element in contact with the image side surface thereof is provided on the image side of the i-th lens. The optical imaging lens of the present application can satisfy the conditional formula -35 < fi / Dis < -1.0, where fi is the effective focal length of the i-th lens, Dis is the outer diameter of the object side surface of the i-th spacer element, and i is taken from 1, 2, 3, 4, 5. By controlling the ratio of the effective focal length of the i-th lens to the outer diameter of the object side surface of the i-th spacer element within this range, it can be ensured that the light passing amount required by the lens can meet the requirements, and it can meet the requirements in the convergence of light, and is beneficial to the adjustment of the structure to reduce the difficulty of lens processing and assembly.

[0058] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 0.9 < Tan(Semi-FOV) / ((D4s - D0s) / (D0m - D4s)) < 4.5, where Semi-FOV is half of the maximum field angle of the optical imaging lens, D4s is the outer diameter of the object side surface of the fourth spacer element, D0s is the outer diameter of the object side end surface of the lens barrel, and D0m is the outer diameter of the image side end surface of the lens barrel. By controlling the half of the maximum field angle of the optical imaging lens, the outer diameter of the object side surface of the fourth spacer element, the outer diameter of the object side end surface of the lens barrel, and the outer diameter of the image side end surface of the lens barrel to satisfy the conditional formula 0.9 < Tan(Semi-FOV) / ((D4s - D0s) / (D0m - D4s)) < 4.5, it can effectively control the outer diameter of the fourth spacer element and the field angle of the imaging lens, effectively reduce the size of the imaging lens, ensure the optical performance of the lens, and moreover, it is easier for the processing and injection molding of accessories and is beneficial to the stable assembly.

[0059] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula 3.5 < f1 / EP01 < 6.0, where f1 is the effective focal length of the first lens, and EP01 is the distance along the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element. By controlling the ratio of the effective focal length of the first lens to the distance along the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element within this range, it can ensure a sufficient aperture to obtain the required depth of field and illuminance, which is beneficial to achieving the compactness of the lens structure, and at the same time is beneficial to correcting off-axis aberrations and improving the overall image quality of the system.

[0060] In an exemplary embodiment, among the six lenses from the first lens to the sixth lens, three lenses can be lenses with positive optical power, and the remaining three lenses can be lenses with negative optical power.

[0061] In an exemplary embodiment, for the three lenses of the first lens, the fourth lens and the fifth lens, the curvature radii of their respective object side surfaces and image side surfaces can each be two values with the same positive or negative sign.

[0062] In an exemplary embodiment, the optical imaging lens of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be disposed at an appropriate position on the optical imaging lens; for example, the aperture stop can be disposed between the object side and the first lens.

[0063] In an exemplary embodiment, the optical imaging lens may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0064] The optical imaging lens according to the above embodiments of this application may include a six-element imaging lens group, a plurality of spacers, and a lens barrel, wherein the third lens and the fourth lens have opposite optical powers, and the thickness of the sixth lens increases from the paraxial direction to the distal axis and then decreases; the outer ring surface of the lens barrel includes at least one conical ring surface; and the image side of the second lens is provided with a second spacer element in contact with its image side surface, the image side of the fourth lens is provided with a fourth spacer element in contact with its image side surface, and the effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy the condition 0<|f4 / f3|×((D4s-d2m) / d2m)<9.0. This ensures that the system has a sufficient amount of light after passing through the second and third lenses; furthermore, it ensures that while meeting imaging requirements, the lens also allows for precise passage of each component through the interlocking space between the optical barrels during assembly, which is beneficial for the stable assembly performance of the third, fourth, and fourth spacer elements; and it provides sufficient space for system coma adjustment, while also preventing the second spacer element, third, and fourth lenses from blocking light during assembly, thus improving lens imaging quality and yield.

[0065] In embodiments of this application, the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens may have one or more aspherical mirror surfaces. Aspherical lenses have better radius of curvature characteristics and have the advantages of improving distortion aberrations and astigmatism aberrations. By using aspherical lenses, aberrations that occur during imaging can be eliminated as much as possible, thereby improving image quality.

[0066] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging lens, and also the number of spacers, can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiments, the optical imaging lens is not limited to including six lenses. If desired, the optical imaging lens may also include other numbers of lenses. As another example, although the first to sixth spacers are described as an example in the embodiments, the optical imaging lens is not limited to including the first to sixth spacers. If desired, the optical imaging lens may also include other numbers of spacers.

[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 2 to 9 Describes an optical imaging lens according to Embodiment 1 of this application. Figure 2 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 1 of this application is shown, and Figure 3 , Figure 4 , Figure 5 Schematic diagrams of the optical imaging lens according to Embodiment 1 of this application are shown in three different embodiments.

[0070] Combination Figures 2 to 5 The optical imaging lens includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[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 concave 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 concave. 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 convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave.

[0072] In this embodiment, the optical imaging lens further includes a filter E7 located on the image side of the sixth lens E6, the filter E7 having an object-side surface S13 and an image-side surface S14. Additionally, the optical imaging lens also includes an imaging surface S15, on which light from the object can sequentially pass through surfaces S1 to S14 and ultimately be imaged.

[0073] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0074]

[0075] Table 1

[0076] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 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:

[0077]

[0078] 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 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A14, A15, A16, A17, A18, A19 ... 10 A 12 A 14 A 16 A 18 and A 20 .

[0079] Face number A4 A6 A8 A10 A12 S1 1.5007E-03 1.3884E-02 -1.2794E-01 5.9915E-01 -1.6371E+00 S2 -4.1546E-02 8.4231E-02 -6.4838E-01 3.0355E+00 -8.7291E+00 S3 -3.9923E-03 6.4190E-02 4.5743E-01 -2.9355E+00 9.9742E+00 S4 -2.1013E-02 4.8316E-01 -2.6605E+00 1.3907E+01 -4.8106E+01 S5 -1.7821E-01 3.0020E-01 -1.3462E+00 4.1648E+00 -9.8850E+00 S6 -1.7974E-01 3.9437E-01 -2.0880E+00 8.2117E+00 -2.2657E+01 S7 -1.8954E-01 8.4694E-02 6.4581E-01 -3.3352E+00 8.9834E+00 S8 -1.7666E-01 1.1677E-01 6.4821E-02 -3.2024E-01 5.7847E-01 S9 -9.4319E-02 -3.2186E-02 1.3627E-02 1.2095E-02 -2.6658E-02 S10 -1.3508E-02 -5.2810E-02 3.4111E-02 -1.4113E-02 3.4383E-03 S11 -6.1051E-02 4.0456E-02 -1.6401E-02 4.1212E-03 -6.4709E-04 S12 -5.0821E-02 1.7595E-02 -2.6890E-03 -1.0080E-04 1.0441E-04

[0080] Table 2-1

[0081] Face number A14 A16 A18 A20 S1 2.6508E+00 -2.5496E+00 1.3380E+00 -3.0030E-01 S2 1.5272E+01 -1.5814E+01 8.8406E+00 -2.0473E+00 S3 -2.0498E+01 2.5504E+01 -1.7619E+01 5.1725E+00 S4 1.0726E+02 -1.4721E+02 1.1341E+02 -3.7381E+01 S5 1.7612E+01 -2.2710E+01 1.8656E+01 -6.9671E+00 S6 4.0665E+01 -4.5161E+01 2.8132E+01 -7.5155E+00 S7 -1.4745E+01 1.4601E+01 -8.0682E+00 1.9049E+00 S8 -5.4891E-01 2.7540E-01 -6.8582E-02 6.4985E-03 S9 2.1057E-02 -7.9156E-03 1.4342E-03 -1.0158E-04 S10 -3.5974E-04 -1.0611E-05 4.7468E-06 -2.2231E-07 S11 6.4311E-05 -3.9605E-06 1.3842E-07 -2.0992E-09 S12 -1.8814E-05 1.7961E-06 -9.2350E-08 1.9863E-09

[0082] Table 2-2

[0083] Figure 3 , Figure 4 and Figure 5 The diagrams show the structure of the optical imaging lens in three different embodiments, namely, Examples 1-1, 1-2, and 1-3, respectively. Figures 3 to 5 As can be seen, an optical imaging lens may also include multiple spacer elements housed in the lens barrel P0.

[0084] Specifically, in embodiments 1-1, 1-2, and 1-3, the plurality of spacer elements include: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0085] The relevant parameter values ​​in Examples 1-1, 1-2, and 1-3 are shown in Table 9, respectively. Figures 3 to 5 as well as Figure 1 Wherein, d1s is the inner diameter of the object side of the first spacer element P1; D1m is the outer diameter of the image side of the first spacer element P1; d2m is the inner diameter of the image side of the second spacer element P2; D2s is the outer diameter of the object side of the second spacer element P2; D3s is the outer diameter of the object side of the third spacer element P3; d4s is the inner diameter of the object side of the fourth spacer element P4; D4s is the outer diameter of the object side of the fourth spacer element P4; D4m is the outer diameter of the image side of the fourth spacer element P4; d6 is the minimum inner diameter of the sixth spacer element P6; d 0m is the inner diameter of the image-side end face of the lens barrel P0; D0s is the outer diameter of the object-side end face of the lens barrel P0; D0m is the outer diameter of the image-side end face of the lens barrel P0; EP01 is the distance along the optical axis from the object-side end face of the lens barrel P0 to the object-side surface of the first spacer element P1; EP12 is the distance along the optical axis from the image-side surface of the first spacer element P1 to the object-side surface of the second spacer element P2; and EP24 is the distance along the optical axis from the image-side surface of the second spacer element P2 to the object-side surface of the fourth spacer element P4; the unit of all the above parameters shown in Table 9 is millimeters (mm).

[0086] Figure 6 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 7 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 8 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 9 The 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 6 to 9It can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0087] Example 2

[0088] The following is for reference Figures 10 to 17 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 10 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 2 of this application is shown, and Figure 11 , Figure 12 , Figure 13 Schematic diagrams of the optical imaging lens according to Embodiment 2 of this application are shown in three different embodiments.

[0089] Combination Figures 10 to 13 The optical imaging lens includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0090] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex.

[0091] In this embodiment, the optical imaging lens further includes a filter E7 located on the image side of the sixth lens E6, the filter E7 having an object-side surface S13 and an image-side surface S14. Additionally, the optical imaging lens also includes an imaging surface S15, on which light from the object can sequentially pass through surfaces S1 to S14 and ultimately be imaged.

[0092] Table 3 shows the basic parameters of the optical imaging lens of Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 4-1 and 4-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical mirrors S1 to S12 in Example 2. 10 A 12 A 14 A 16 A 18 and A 20Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0093]

[0094] Table 3

[0095]

[0096]

[0097] Table 4-1

[0098] Face number A14 A16 A18 A20 S1 -2.3915E-02 -1.1694E-02 1.9537E-02 -8.6654E-03 S2 -1.5684E-01 6.7376E-01 -6.8793E-01 2.3407E-01 S3 -7.7100E+00 8.1138E+00 -4.8352E+00 1.2361E+00 S4 2.3502E+01 -2.4724E+01 1.3713E+01 -2.9006E+00 S5 -6.2991E+01 7.7038E+01 -5.2211E+01 1.5117E+01 S6 2.9672E+00 -2.8902E+00 1.5249E+00 -3.3368E-01 S7 -6.1601E+00 4.2799E+00 -1.6536E+00 2.6908E-01 S8 -4.5717E-01 1.8895E-01 -4.1148E-02 3.6698E-03 S9 -5.1444E-03 7.8134E-04 -5.8372E-05 1.5648E-06 S10 -6.9613E-04 4.3293E-05 1.7208E-06 -2.5602E-07 S11 -1.8202E-05 2.0434E-06 -1.0302E-07 2.0266E-09 S12 4.0715E-05 -2.8511E-06 1.0907E-07 -1.7382E-09

[0099] Table 4-2

[0100] Figure 11 , Figure 12 and Figure 13 The diagrams show the structural schematics of the optical imaging lens under three different embodiments, namely, Examples 2-1, 2-2, and 2-3. Figures 11 to 13 As can be seen, an optical imaging lens may also include multiple spacer elements housed in the lens barrel P0.

[0101] Specifically, in embodiments 2-1 and 2-2, the plurality of spacer elements include: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0102] In embodiments 2-3, the plurality of spacers include: a first spacer P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth spacer P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; and a sixth spacer P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0103] The relevant parameter values ​​in Examples 2-1, 2-2 and 2-3 are shown in Table 9. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 9 is millimeters (mm).

[0104] Figure 14 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 15 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 16 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 17 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 14 to 17 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0105] Example 3

[0106] The following is for reference Figures 18 to 25 An optical imaging lens according to Embodiment 3 of this application is described. Figure 18 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 3 of this application is shown, and Figure 19 , Figure 20 , Figure 21 Schematic diagrams of the optical imaging lens according to Embodiment 3 of this application are shown in three different embodiments.

[0107] Combination Figures 18 to 21 The optical imaging lens includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0108] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave.

[0109] In this embodiment, the optical imaging lens further includes a filter E7 located on the image side of the sixth lens E6, the filter E7 having an object-side surface S13 and an image-side surface S14. Additionally, the optical imaging lens also includes an imaging surface S15, on which light from the object can sequentially pass through surfaces S1 to S14 and ultimately be imaged.

[0110] Table 5 shows the basic parameters of the optical imaging lens of Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 6-1 and 6-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical mirrors S1 to S12 in Example 3. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0111]

[0112] Table 5

[0113]

[0114]

[0115] Table 6-1

[0116] Face number A14 A16 A18 A20 S1 -1.1504E+00 1.0837E+00 -5.4437E-01 1.1019E-01 S2 -6.2484E-01 9.7460E-01 -6.8077E-01 1.8175E-01 S3 -1.4651E+01 1.4783E+01 -8.2569E+00 1.9586E+00 S4 8.4534E+00 2.9015E+00 -1.1652E+01 6.5647E+00 S5 -5.6783E+01 7.4624E+01 -5.3837E+01 1.6510E+01 S6 1.8484E+01 -1.8213E+01 9.9556E+00 -2.3194E+00 S7 -1.1051E+01 8.4417E+00 -3.3959E+00 5.0640E-01 S8 -5.7636E-01 2.6644E-01 -6.4937E-02 6.4940E-03 S9 5.7240E-03 -1.6998E-03 2.5984E-04 -1.5823E-05 S10 1.1875E-03 -3.0728E-04 3.9556E-05 -2.0312E-06 S11 7.7991E-05 -4.9103E-06 1.7564E-07 -2.7331E-09 S12 -6.3825E-05 5.1410E-06 -2.3408E-07 4.6297E-09

[0117] Table 6-2

[0118] Figure 19 , Figure 20 and Figure 21 The diagrams show the structural schematics of the optical imaging lens under three different embodiments, namely, Examples 3-1, 3-2, and 3-3, in conjunction with... Figures 19 to 21 As can be seen, an optical imaging lens may also include multiple spacer elements housed in the lens barrel P0.

[0119] Specifically, in embodiments 3-1, 3-2, and 3-3, the plurality of spacer elements include: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0120] The relevant parameter values ​​in Examples 3-1, 3-2 and 3-3 are shown in Table 9. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 9 is millimeters (mm).

[0121] Figure 22 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 23 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 24 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 25 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 22 to 25 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0122] Example 4

[0123] The following is for reference Figures 26 to 33 An optical imaging lens according to Embodiment 4 of this application is described. Figure 26 A schematic diagram of the lens group included in the optical imaging lens according to Embodiment 4 of this application is shown, and Figure 27 , Figure 28 , Figure 29 Schematic diagrams of the optical imaging lens according to Embodiment 4 of this application are shown in three different embodiments.

[0124] Combination Figures 26 to 29The optical imaging lens includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0125] 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 negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex.

[0126] In this embodiment, the optical imaging lens also includes an imaging surface S13 located on the image side of the sixth lens E6, where light from the object can pass sequentially through each surface S1 to S12 and finally be imaged on the imaging surface S13.

[0127] Table 7 shows the basic parameters of the optical imaging lens of Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 8-1 and 8-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical mirrors S1 to S12 in Example 4. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0128]

[0129] Table 7

[0130]

[0131]

[0132] Table 8-1

[0133] Face number A14 A16 A18 A20 S1 -1.9700E+00 5.1315E+00 -6.3538E+00 2.8635E+00 S2 -7.5346E+01 1.0854E+02 -9.3378E+01 3.6040E+01 S3 -3.9567E+02 6.5695E+02 -6.1091E+02 2.4345E+02 S4 3.8901E+00 -8.1165E+01 1.4438E+02 -8.4753E+01 S5 -1.7330E+02 3.1602E+02 -3.1296E+02 1.2797E+02 S6 9.9027E+01 -8.5636E+01 2.6859E+01 3.5373E+00 S7 7.9773E+01 -5.1095E+01 -7.7236E+00 1.9316E+01 S8 5.3350E+00 -4.5436E+00 1.7563E+00 -3.0914E-02 S9 1.3321E+01 -1.1977E+01 5.9897E+00 -1.2676E+00 S10 6.3933E-01 -3.0028E-01 7.6165E-02 -8.4281E-03 S11 -1.0156E-02 1.8096E-03 -1.8135E-04 7.7414E-06 S12 -1.1159E-03 1.2492E-04 -7.9541E-06 2.2064E-07

[0134] Table 8-2

[0135] Figure 27 , Figure 28 and Figure 29 The diagrams show the structural schematics of the optical imaging lens in three different embodiments, namely 4-1, 4-2, and 4-3, respectively. Figures 27 to 29 As can be seen, an optical imaging lens may also include multiple spacer elements housed in the lens barrel P0.

[0136] Specifically, in embodiments 4-1, 4-2, and 4-3, the plurality of spacer elements include: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0137] The relevant parameter values ​​in Examples 4-1, 4-2 and 4-3 are shown in Table 9. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 9 is millimeters (mm).

[0138] Figure 30 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 31 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 32 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 33 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 30 to 33 It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0139]

[0140]

[0141] Table 9

[0142] Furthermore, in Examples 1 to 4, the effective focal length values ​​f1 to f6 of each lens, the effective focal length f of the optical imaging lens, and the maximum field of view (FOV) of the optical imaging lens are shown in Table 10.

[0143] Parameters / Examples 1 2 3 4 f1(mm) 3.12 3.25 3.15 2.76 f2 (mm) -7.92 -8.85 -9.27 -3.94 f3 (mm) 20555.33 -86.71 -75.34 4.01 f4 (mm) -95.04 31.71 237.09 -9.13 f5 (mm) 13.55 27.03 22.52 6.82 f6 (mm) -3.76 -3.37 -4.29 -3.64 f(mm) 4.58 4.58 4.58 3.95 FOV (°) 81.6 83.0 81.7 82.1

[0144] Table 10

[0145] Examples 1 to 4 satisfy the conditions shown in Tables 11-1 and 11-2, respectively.

[0146]

[0147] Table 11-1

[0148]

[0149]

[0150] Table 11-2

[0151] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0152] 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 protection 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 concept of this application. 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, comprising a lens barrel and a lens group and a plurality of spacer elements housed within the lens barrel, characterized in that, The outer annular surface of the lens barrel includes at least one conical annular surface; The lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side along the optical axis. The first lens has positive optical power, with a convex object side and a concave image side; the second lens has negative optical power, with a concave image side; the third and fourth lenses have opposite optical powers, with the third lens having a convex object side and the fourth lens having a concave object side and a convex image side; the fifth lens has positive optical power; and the sixth lens has negative optical power, with a concave object side. The thickness of the sixth lens along the direction parallel to the optical axis increases from the paraxial direction to the distal axis and then decreases. The plurality of spacers include: a second spacer located on the image side of the second lens and in contact with the image side of the second lens; and a fourth spacer located on the image side of the fourth lens and in contact with the image side of the fourth lens; The optical imaging lens has six lenses with optical power. The optical imaging lens satisfies: 0<|f4 / f3|×((D4s-d2m) / d2m)≤8.54, 17.98≤(R4-R8) / EP24≤54.94; Wherein, f4 is the effective focal length of the fourth lens, f3 is the effective focal length of the third lens, D4s is the outer diameter of the object side of the fourth spacer element, d2m is the inner diameter of the image side of the second spacer element, R4 is the radius of curvature of the image side of the second lens, R8 is the radius of curvature of the image side of the fourth lens, and EP24 is the distance along the optical axis from the image side of the second spacer element to the object side of the fourth spacer element.

2. The optical imaging lens according to claim 1, characterized in that, The effective focal length f5 of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, and the inner diameter d4s of the object side of the fourth spacer element satisfy the following: 2.21≤f5 / (D4m-d4s)≤9.

18.

3. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers further includes: a sixth spacer, located on the image side of the sixth lens and in contact with the image side of the sixth lens; The effective focal length f6 of the sixth lens, the inner diameter d0m of the image-side end face of the lens barrel, and the minimum inner diameter d6 of the sixth spacer element satisfy the following: -4.79≤f6 / (d0m-d6)≤-2.

26.

4. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers further includes: a first spacer, located on the image side of the first lens and in contact with the image side of the first lens; The aperture coefficient Fno of the optical imaging lens, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the following: 5.0≤Fno / (EP01 / d1s)≤7.

69.

5. The optical imaging lens according to claim 4, characterized in that, The effective focal length f1 of the first lens, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 4.37≤f1 / (EP01-T12)≤7.

03.

6. The optical imaging lens according to claim 4, characterized in that, The effective focal length f2 of the second lens, the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following: -57.60≤f2 / (EP12-T23)≤-34.

69.

7. The optical imaging lens according to claim 4, characterized in that, The radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R4 of the image-side surface of the second lens, the air gap T12 between the first and second lenses on the optical axis, and the distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element along the optical axis satisfy the following: 23.47≤(R2+R4) / (T12+EP12)≤28.

47.

8. The optical imaging lens according to claim 4, characterized in that, The radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R1 of the object-side surface of the first lens, the outer diameter D1m of the image-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the following: 1.61≤(R2-R1) / (D1m-d1s)≤4.

68.

9. The optical imaging lens according to claim 1, characterized in that, In the first to the fifth lenses, the i-th lens has negative optical power, and the i-th spacer element is a spacer element located on the image side of the i-th lens and in contact with the image side surface of the i-th lens. The effective focal length fi of the i-th lens and the outer diameter Dis of the object side surface of the i-th spacer element satisfy the following: -33.18≤fi / Dis≤-1.32, where i is taken from 1, 2, 3, 4, 5.

10. The optical imaging lens according to claim 1, characterized in that, The Semi-FOV (half of the maximum field of view of the optical imaging lens), the outer diameter D4s of the object side of the fourth spacer element, the outer diameter D0s of the object side end face of the lens barrel, and the outer diameter D0m of the image side end face of the lens barrel satisfy the following: 0.99≤Tan(Semi-FOV) / ((D4s-D0s) / (D0m-D4s))≤4.

21.

11. The optical imaging lens according to claim 4, characterized in that, The effective focal length f1 of the first lens and the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis satisfy the following: 3.85≤f1 / EP01≤5.

63.

12. The optical imaging lens according to any one of claims 1 to 11, characterized in that, The object-side radius of curvature and the image-side radius of curvature of the fifth lens are two numerical values ​​with the same positive and negative signs.

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