Optical imaging lens

Abstract

This application discloses an optical imaging lens, comprising: an imaging lens group, which sequentially includes, along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power; a plurality of spacer elements, including a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; and a lens barrel for accommodating the imaging lens group and the plurality of spacer elements; wherein the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the outer diameter D5m of the image side surface of the fifth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -7.5 < (R7 + R8) / (D5m - d5m) < -1.0.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of Chinese invention patent application filed on June 7, 2022, entitled "Optical Imaging Lens" and with application number 202210638659.4. Technical Field

[0003] This application relates to the field of optical components, and more specifically, to an optical imaging lens. Background Technology

[0004] In recent years, wide-angle cameras have become increasingly popular on mobile phones due to their larger field of view and greater depth of field. This allows for capturing a wider background in selfies while maintaining sharp image quality, resulting in a more balanced proportion of the subject in the picture and a more aesthetically pleasing image. However, wide-angle lenses generally suffer from disadvantages such as larger size and poorer structural stability.

[0005] As is well known, the lens elements in an optical imaging lens include the imaging part and the structural part. When light is incident on the structural part and reflected or refracted by the lens elements before reaching the image plane, stray light is easily generated. Moreover, wide-angle lenses have a larger field of view, making their structural parts more prone to generating stray light.

[0006] Therefore, how to reduce the axial length of the lens group while ensuring a wide angle and long depth of field, so that the lens is more advantageous in terms of thinness and lightness, and how to improve the structure of the spacer elements (such as ring optical elements and light shields) in the lens to improve stray light and assembly stability have become one of the most important issues today. Summary of the Invention

[0007] This application provides an optical imaging lens comprising: an imaging lens group, which sequentially includes, along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power; a plurality of spacer elements, including a fifth spacer element disposed between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens; and a lens barrel for accommodating the imaging lens group and the plurality of spacer elements; wherein the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the outer diameter D5m of the image side surface of the fifth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -7.5 < (R7 + R8) / (D5m - d5m) < -1.0.

[0008] This application provides an optical imaging lens comprising: an imaging lens group, comprising, along the optical axis from the object side to the image side, sequentially: a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, a fourth lens having negative optical power, a fifth lens having positive optical power, and a sixth lens having positive optical power; and a plurality of spacer elements, including a first spacer element disposed between the first and second lenses and in contact with the image-side surface of the first lens, a second spacer element disposed between the second and third lenses and in contact with the image-side surface of the second lens, a fifth spacer element disposed between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens, and a sixth spacer element disposed between the image-side surface of the sixth lens and in contact with the image-side surface of the sixth lens; and a lens barrel for accommodating... The nano-imaging lens group and multiple spacer elements; wherein, the outer diameter D1s of the object side of the first spacer element, half of the maximum field of view of the optical imaging lens (Semi-FOV), the sum of the air gaps ∑AT between any two adjacent lenses in the first to sixth lenses along the optical axis and the maximum height L of the lens barrel along the optical axis satisfy: -4.0 < D1s × tan(Semi-FOV) / (∑AT - L) < -2.0; and the outer diameter D1s of the object side of the first spacer element, the inner diameter d2s of the object side of the second spacer element, the effective focal length f2 of the second lens, the outer diameter D5m of the image side of the fifth spacer element, and the gap EP56 between the fifth and sixth spacer elements along the optical axis satisfy: 16.0 < (D1s - d2s) × f2 - (D5m × EP56) < 33.0.

[0009] In one embodiment, the plurality of spacers further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side of the third lens, wherein the inner diameter d3s of the object side of the third spacer element, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 5.0 < d3s / (R5+R6) < 10.5.

[0010] In one embodiment, the plurality of spacers further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, wherein the effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the gap EP45 between the fourth and fifth spacers element along the optical axis satisfy: -17.5 < (CT5 + T45) × EP45 / (CP4 × f4) < -5.0.

[0011] In one embodiment, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D5m of the image side of the fifth spacer element, and the inner diameter d5m of the image side of the fifth spacer element satisfy: -7.5 < (R7 + R8) / (D5m - d5m) < -1.0.

[0012] In one embodiment, the inner diameter d5s of the object side of the fifth spacer element, the inner diameter d6s of the object side of the sixth spacer element, the center thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy: 10.0 < (d5s + d6s) / (CT6 + T56) < 13.5.

[0013] In one embodiment, the plurality of spacers further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, wherein the inner diameter d4s of the object side of the fourth spacer element, the spacing EP45 between the fourth spacer element and the fifth spacer element along the optical axis, and the center thickness CT4 of the fourth lens along the optical axis satisfy: 4.0 < (d4s-EP45) / CT4 < 9.0.

[0014] In one embodiment, the plurality of spacers further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, wherein the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer element along the optical axis, and the maximum thickness CP4 of the fourth spacer element along the optical axis satisfy: 11.0 < CT3 / CP3 - CT4 / CP4 < 17.5.

[0015] In one embodiment, the effective focal length f1 of the first lens, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the maximum thickness CP1 of the first spacer element along the optical axis, the maximum thickness CP5 of the fifth spacer element along the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy: |f6×CP1 / (CP5×f5+f1×CP6)|<37.0.

[0016] In one embodiment, the maximum thickness CP1 of the first spacer element along the optical axis, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy: 110.0 < (R1 + R2) / CP1 < 135.0.

[0017] In one embodiment, the plurality of spacers further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, wherein the effective focal length f6 of the sixth lens, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R11 of the object side of the sixth lens, and the maximum thickness CP4 of the fourth spacer element along the optical axis satisfy: -230.0 < f6 / R11 + R7 / CP4 < 311.0.

[0018] In one embodiment, the plurality of spacers further includes at least one auxiliary spacer disposed between any two adjacent lenses, wherein the object side of the auxiliary spacer is in contact with a spacer or other auxiliary spacer located on its object side, and the image side of the auxiliary spacer is in contact with a lens or other auxiliary spacer located on its image side.

[0019] The optical imaging lens provided in this application can meet the condition -7.5 < (R7 + R8) / (D5m - d5m) < -1.0, which can effectively reduce the curvature of the lens, reduce the molding risk and appearance risk, and avoid large assembly discrepancies at this position, which can greatly improve the stability of the lens and avoid the drawback of poor consistency of most wide-angle lenses.

[0020] The optical imaging lens provided in this application consists of an imaging lens group, multiple spacer elements, and a lens barrel. By adjusting the air gap between the lenses in the imaging lens group and the relationship between the field of view and the maximum height of the lens barrel, the lens achieves a small axial height while ensuring imaging capability, thus enabling miniaturization and weight reduction. The optical imaging lens provided in this application reasonably controls the effective focal length of the second lens, which helps to improve the field of view. At the same time, setting the outer diameter of the object side of the first spacer and the inner diameter of the object side of the second spacer can effectively absorb the internal reflection stray light of the optical structure of the first lens, resulting in clear and abnormal imaging. Reasonably setting the gap between the fifth and sixth spacer elements helps to reduce EP56 sensitivity and obtain a linear proportional change between air gap and field curvature, which can more effectively adjust the MTF characteristic curve yield in actual production. 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 A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to this application are shown;

[0023] Figure 1B A schematic diagram of a spacing element for reducing stray light in an optical imaging lens according to this application is shown;

[0024] Figure 2A and Figure 2B A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown;

[0025] Figures 3A to 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0026] Figure 4A and Figure 4B A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0027] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0028] Figure 6A and Figure 6B A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown; and

[0029] Figures 7A to 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 of this application are shown. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0034] 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.

[0035] 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.

[0036] 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 to sixth lenses), lens barrel structures, 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.

[0037] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1A This diagram illustrates the structural layout and some parameters of an optical imaging lens according to this application. Those skilled in the art will understand that some parameters frequently used in the art, such as the radius of curvature R5 of the object-side surface of the third lens, are not shown in the diagram. Figure 1A As shown in the figure, Figure 1AThe present application only exemplarily illustrates some parameters of the lens barrel and spacer element of an optical imaging lens to facilitate a better understanding of the invention. Figure 1A As shown, EP12 represents the spacing between the first and second spacers along the optical axis; D0s represents the outer diameter of the object end face of the lens barrel; d0s represents the inner diameter of the object end face of the lens barrel; D1s represents the outer diameter of the object side face of the first spacer; d1s represents the inner diameter of the object side face of the first spacer; CP1 represents the maximum thickness of the first spacer along the optical axis; CP2 represents the maximum thickness of the second spacer along the optical axis; D1m represents the outer diameter of the image side face of the first spacer; d1m represents the inner diameter of the image side face of the first spacer; D6s represents the outer diameter of the object side face of the sixth spacer; d6s represents the inner diameter of the object side face of the sixth spacer; d6m represents the inner diameter of the image side face of the sixth spacer; D6m represents the outer diameter of the image side face of the sixth spacer; d0m represents the inner diameter of the image end face of the lens barrel; D0m represents the outer diameter of the image end face of the lens barrel; L represents the maximum height of the lens barrel along the optical axis.

[0038] The features, principles and other aspects of this application are described in detail below.

[0039] like Figure 1A As shown, an optical imaging lens according to an exemplary embodiment of this application includes an imaging lens group and a plurality of spacer elements. The imaging lens group, along the optical axis from the object side to the image side, sequentially includes: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, a fifth lens E5 with positive optical power, and a sixth lens E6 with positive optical power. Any two adjacent lenses from the first lens E1 to the sixth lens E6 may have a spacer distance. By rationally allocating the positive and negative optical powers of each lens in the optical imaging lens, the low-order aberrations of the optical imaging lens can be effectively balanced and controlled, and the sensitivity to tolerances can be reduced, maintaining the miniaturization of the optical imaging lens.

[0040] In an exemplary implementation, such as Figure 1BAs shown, the plurality of spacers include a first spacer P1 placed 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 placed 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 placed 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 placed 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 P5 placed 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 P6 placed on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0041] In an exemplary embodiment, the plurality of spacers further includes at least one auxiliary spacer disposed between any two adjacent lenses, wherein the object-side surface of the auxiliary spacer is in contact with a spacer or other auxiliary spacer located on its object-side surface, and the image-side surface of the auxiliary spacer is in contact with a lens or other auxiliary spacer located on its image-side surface. Figure 1B As shown, P5b is an auxiliary spacer element, whose object side is in contact with the fifth spacer element P5 located on its object side, and whose image side is in contact with the sixth lens E6 located on its image side.

[0042] In an exemplary embodiment, the optical imaging lens includes at least six spacer elements, which help the optical imaging lens intercept excess reflective light paths and reduce stray light and ghosting.

[0043] Figure 1B A schematic diagram illustrating the reduction of stray light by a spacer element in an optical imaging lens according to this application is shown. A beam of light G enters the first lens E1 and is reflected to a structural portion of the first lens E1, and then reflected again by the structural portion of the first lens E1 to the second spacer element P2, without entering the rear lens. The dashed line represents the path of this beam of light G into the rear lens without being blocked by the second spacer element P2. It should be understood that, for the sake of clarity of the structure and labeling in the figures, Figure 1B The example only uses the second spacer element P2 to eliminate stray light; the other spacers also have the function of eliminating stray light, and the principle of eliminating stray light is the same. Therefore, the optical imaging lens of this application can block non-imaging optical paths, reduce stray light, and ensure the imaging effect of the lens by incorporating multiple spacers.

[0044] In an exemplary implementation, such as Figure 1A and Figure 1B As shown, the optical imaging lens also includes a lens barrel for housing the imaging lens group and multiple spacer elements.

[0045] In an exemplary embodiment, the optical imaging lens according to this application satisfies: |f6×CP1 / (CP5×f5+f1×CP6)|<37.0, where f1 is the effective focal length of the first lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, CP1 is the maximum thickness of the first spacer element along the optical axis, CP5 is the maximum thickness of the fifth spacer element along the optical axis, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and CP1 can be referenced. Figure 1A More specifically, f1, f5, f6, CP1, CP5, and CP6 can further satisfy: |f6×CP1 / (CP5×f5+f1×CP6)|<36.27. Satisfying |f6×CP1 / (CP5×f5+f1×CP6)|<37.0, by controlling the effective focal lengths of the first, fifth, and sixth lenses, a more ideal field of view can be obtained, improving relative illumination and pixels without sacrificing image quality. By comprehensively considering and optimizing the effective focal lengths of the first, fifth, and sixth lenses, as well as the maximum thickness of the first, fifth, and sixth spacers, while ensuring a wide angle and long depth of field, the axial length of the lens group is reduced, further shortening the lens barrel. This makes the lens more advantageous in terms of thinness and lightness, minimizing the disadvantage of wide-angle lenses being generally too large, and better meeting the usage needs of various special scenarios.

[0046] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 5.0 < d3s / (R5+R6) < 10.5, where d3s is the inner diameter of the object-side surface of the third spacer element, R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens. More specifically, d3s, R5, and R6 further satisfy: 5.18 < d3s / (R5+R6) < 10.36. To satisfy the condition 5.0 < d3s / (R5+R6) < 10.5, the inner diameter of the object side of the third spacer element can act as a light blocker, effectively reducing the probability of excess light entering the optical imaging lens. At the same time, by reasonably controlling the curvature radius of the fifth and sixth lenses, the uniformity of light distribution upon reaching the image plane can be effectively controlled, thereby effectively controlling the MTF curve dispersion of the optical imaging lens, improving the evaluation peak, and obtaining better imaging capabilities. In addition, a reasonable curvature radius can reduce the degree of lens bending, thereby reducing the internal stress during molding, reducing the risk of cracking during assembly, and improving the yield of finished products.

[0047] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -17.5 < (CT5 + T45) × EP45 / (CP4 × f4) < -5.0, where f4 is the effective focal length of the fourth lens, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap between the fourth and fifth lenses on the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, and EP45 is the spacing between the fourth and fifth spacers along the optical axis. More specifically, CT5, T45, EP45, CP4, and f4 further satisfy: -17.19 < (CT5 + T45) × EP45 / (CP4 × f4) < -5.51. Satisfying -17.5 < (CT5 + T45) × EP45 / (CP4 × f4) < -5.0 can effectively avoid stray light from black objects, while improving assembly stability, stabilizing the air gap, reducing lens sensitivity, and improving reliability.

[0048] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -7.5 < (R7 + R8) / (D5m - d5m) < -1.0, where R7 is the radius of curvature of the object-side surface of the fourth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, D5m is the outer diameter of the image-side surface of the fifth spacer element, and d5m is the inner diameter of the image-side surface of the fifth spacer element. More specifically, R7, R8, D5m, and d5m further satisfy: -7.43 < (R7 + R8) / (D5m - d5m) < -1.04. Satisfying -7.5 < (R7 + R8) / (D5m - d5m) < -1.0 can effectively reduce the curvature of the lens, reduce molding and appearance risks, and avoid large assembly discrepancies at this location, which can significantly improve lens stability and avoid the drawback of poor consistency in most wide-angle lenses.

[0049] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 10.0 < (d5s + d6s) / (CT6 + T56) < 13.5, where d5s is the inner diameter of the object-side surface of the fifth spacer element, d6s is the inner diameter of the object-side surface of the sixth spacer element, CT6 is the center thickness of the sixth lens on the optical axis, T56 is the air gap between the fifth and sixth lenses on the optical axis, and d6s can be referenced... Figure 1AMore specifically, d5s, d6s, CT6, and T56 can further satisfy: 10.47 < (d5s + d6s) / (CT6 + T56) < 13.11. Satisfying 10.0 < (d5s + d6s) / (CT6 + T56) < 13.5 can effectively eliminate incident light with poor edge quality and useless light generated by reflections within the mechanism, increase the uniformity of light distribution in all directions on the image plane, and obtain imaging distortion performance superior to previous wide-angle lenses; at the same time, the thickness ratio of the sixth lens will also be controlled within a reasonable range, reducing the risk of weld lines, improving lens smoothness, reducing assembly tilt, and thus improving the overall stability of the optical imaging lens and increasing mass production yield.

[0050] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 4.0 < (d4s - EP45) / CT4 < 9.0, where d4s is the inner diameter of the object side of the fourth spacer element, EP45 is the spacing between the fourth and fifth spacers along the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. More specifically, d4s, EP45, and CT4 further satisfy: 4.49 < (d4s - EP45) / CT4 < 8.89. Satisfying 4.0 < (d4s - EP45) / CT4 < 9.0 reduces the angle between the light rays passing through the fourth lens and the optical axis, making the light rays more convergent and improving relative illumination. Simultaneously, excess light can be absorbed by appropriately setting the d4s parameter, reducing ghosting stray light caused by light leakage at the edge of the fourth lens. Furthermore, appropriately setting the center thickness of the fourth lens on the optical axis helps improve the smoothness of the lens surface, reduces interference from the assembly bearing surface, and improves the lens bearing tightness, thereby enhancing stability.

[0051] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 11.0 < CT3 / CP3 - CT4 / CP4 < 17.5, 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, CP3 is the maximum thickness of the third spacer element along the optical axis, and CP4 is the maximum thickness of the fourth spacer element along the optical axis. More specifically, CT3, CP3, CT4, and CP4 further satisfy: 11.10 < CT3 / CP3 - CT4 / CP4 < 17.41. The third and fourth lenses are located in the middle of the entire imaging lens group. The air gap at this point is the most sensitive to the entire optical system, satisfying 11.0 < CT3 / CP3 - CT4 / CP4 < 17.5. By reasonably adjusting the parameters between the thickness of the third and fourth lenses and the thickness of the third and fourth spacer elements, the system sensitivity of the air gap between the third and fourth lenses can be reduced to the greatest extent, allowing the optical imaging lens to maintain good performance under high temperature, high humidity, and thermal shock conditions. At the same time, by controlling the center thickness of the third and fourth lenses, a more uniform lens thickness can be obtained, which is beneficial to lens shaping, reduces surface asymmetry, and thus obtains better imaging performance.

[0052] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 16.0 < (D1s - d2s) × f2 - (D5m × EP56) < 33.0, where D1s is the outer diameter of the object-side surface of the first spacer element, d2s is the inner diameter of the object-side surface of the second spacer element, f2 is the effective focal length of the second lens, D5m is the outer diameter of the image-side surface of the fifth spacer element, and EP56 is the spacing between the fifth and sixth spacer elements along the optical axis. More specifically, D1s, d2s, f2, D5m, and EP56 further satisfy: 16.19 < (D1s - d2s) × f2 - (D5m × EP56) < 32.10. Satisfying 16.0 < (D1s - d2s) × f2 - (D5m × EP56) < 33.0, properly controlling the effective focal length of the second lens is beneficial to improving the lens's field of view. Simultaneously, setting the values ​​of the outer diameter of the object-side surface of the first spacer and the inner diameter of the object-side surface of the second spacer can effectively absorb stray light reflected from the optical structure of the first lens, resulting in clear and abnormal image formation. EP56 is used to adjust the air gap for system field curvature. Properly setting the parameter range of EP56 can reduce its sensitivity and achieve a linear proportional change between air gap and field curvature, allowing for more effective adjustment of the MTF characteristic curve yield in actual production.

[0053] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 110.0 < (R1 + R2) / CP1 < 135.0, where CP1 is the maximum thickness of the first spacer element along the optical axis, R1 is the radius of curvature of the object-side surface of the first lens, R2 is the radius of curvature of the image-side surface of the first lens, and CP1 can be referenced. Figure 1A More specifically, R1, R2, and CP1 can further satisfy: 117.35 < (R1 + R2) / CP1 < 134.84. Satisfying 110.0 < (R1 + R2) / CP1 < 135.0 helps balance system aberrations and improves the convergence of the first two lenses for incoming light, thereby increasing the lens's field of view and achieving better wide-angle performance. Controlling the thickness of the first spacer element can effectively eliminate stray light generated within the mechanism by the inner diameter surfaces of the first lens and the first spacer element, suppressing stray light risks. The first and second lenses satisfying 110.0 < (R1 + R2) / CP1 < 135.0 allow for a more rational design of the mechanism's support portion, achieving excellent assembly stability and improving process yield.

[0054] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -230.0 < f6 / R11 + R7 / CP4 < 311.0, where f6 is the effective focal length of the sixth lens, R7 is the radius of curvature of the object-side surface of the fourth lens, R11 is the radius of curvature of the object-side surface of the sixth lens, and CP4 is the maximum thickness of the fourth spacer element along the optical axis. More specifically, f6, R11, R7, and CP4 further satisfy: -224.08 < f6 / R11 + R7 / CP4 < 310.79. Satisfying -230.0 < f6 / R11 + R7 / CP4 < 311.0, reasonably controlling the curvature radius of the object side of the fourth lens and the object side of the sixth lens is beneficial to improving the chromatic aberration and distortion of the optical imaging lens, thereby improving the imaging quality. Reasonably controlling the thickness of the fourth spacer to make it cooperate with the structure of the third and fourth lenses ensures the stability of the assembly and can better determine the position of the light cut. Reasonably controlling the focal length of the sixth lens can adjust the light focusing position and shorten the overall length of the optical imaging lens.

[0055] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -4.0 < D1s × tan(Semi-FOV) / (∑AT - L) < -2.0, where D1s is the outer diameter of the object-side surface of the first spacer element, Semi-FOV is half of the maximum field of view of the optical imaging lens, ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses from the first to the sixth lens, and L is the maximum height of the lens barrel along the optical axis. D1s and L can be referenced. Figure 1AMore specifically, D1s, Semi-FOV, ∑AT, and L can further satisfy: -3.23 < D1s × tan(Semi-FOV) / (∑AT - L) < -2.43. Satisfying -4.0 < D1s × tan(Semi-FOV) / (∑AT - L) < -2.0, by adjusting the air gap between the lenses in the imaging lens group and the relationship between the field of view and the maximum height of the lens barrel, the lens can have a smaller axial height while ensuring imaging capability, giving it miniaturization and lightweight characteristics to meet the lens requirements of existing ultra-thin wide-angle mobile phones. At the same time, it avoids the risk of the object side of the first lens and the image side of the sixth lens bulging outwards, preventing appearance risks to the lens. The structural part of the first lens of the wide-angle lens is prone to stray light; reasonably controlling the outer diameter of the object side of the first spacer within a certain range prevents light from entering the structural part of the second lens from the structural part of the first lens, thus avoiding stray light.

[0056] In an exemplary embodiment, half of the maximum field of view (Semi-FOV) of the optical imaging lens can be greater than 60°, and the Semi-FOV can be, for example, in the range of 60.6° to 60.9°.

[0057] In an exemplary embodiment, the effective focal length f1 of the first lens may be in the range of -3.31 mm to -3.28 mm, the effective focal length f4 of the fourth lens may be in the range of -3.32 mm to -3.15 mm, the effective focal length f5 of the fifth lens may be in the range of 3.20 mm to 3.40 mm, and the effective focal length f6 of the sixth lens may be in the range of 233.85 mm to 770.31 mm.

[0058] In exemplary embodiments, the optical imaging lens may further 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 miniaturization, large image plane, large aperture, and high image quality. The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the six lenses mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between lenses, 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 manufacturing.

[0059] In 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 sixth lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. 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, and sixth lenses is an aspherical mirror surface.

[0060] 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.

[0061] Example 1

[0062] The following is for reference Figures 2A to 3D The optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are described. Figure 2A and Figure 2B Schematic diagrams of the optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are shown respectively.

[0063] like Figure 2A and Figure 2B As shown, both optical imaging lens 1001 and optical imaging lens 1002 include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P6.

[0064] like Figure 2A and Figure 2BAs shown, optical imaging lenses 1001 and 1002 employ the same imaging lens group. The imaging lens group of optical imaging lenses 1001 and 1002, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive 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 concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex 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. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged onto the imaging plane (not shown).

[0065] Table 1 shows the basic parameters of the imaging lens group of optical imaging lens 1001 and optical imaging lens 1002 in Embodiment 1, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0066]

[0067] Table 1

[0068] In this example, the effective focal length f1 of the first lens is -3.29mm, the effective focal length f2 of the second lens is 7.23mm, the effective focal length f4 of the fourth lens is -3.31mm, the effective focal length f5 of the fifth lens is 3.37mm, the effective focal length f6 of the sixth lens is 233.86mm, and half of the maximum field of view of the optical imaging lens (Semi-FOV) is 60.8°.

[0069] In Embodiment 1, the object-side surface and image-side surface 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:

[0070]

[0071] Where x is the distance vector from the vertex of the aspherical surface at a height 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 give the higher-order coefficients A4, A6, A8, A1, A2, A3, A4, A5, A6, A8, A1 ... 10 A 12A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0072] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.4700E+00 -2.4621E-01 6.7072E-02 -2.3978E-02 8.8638E-03 -3.4771E-03 1.3669E-03 S2 5.9248E-01 -1.7597E-01 3.3725E-03 6.2631E-03 5.1462E-03 -2.1610E-03 -1.0874E-03 S3 -2.4664E-01 -7.5212E-03 1.2819E-02 -1.4329E-03 -1.8070E-03 -1.4599E-04 2.2330E-04 S4 -3.0790E-02 6.0579E-03 5.4775E-03 1.1101E-03 2.0759E-04 1.3985E-05 9.9066E-06 S5 1.2116E-02 -3.4386E-04 -1.3673E-04 -6.4095E-05 -8.3971E-05 -7.9536E-05 -6.8878E-05 S6 -5.2270E-02 -1.2737E-04 -7.7020E-07 2.0536E-04 1.0290E-04 3.7046E-05 1.5927E-05 S7 -2.3281E-01 4.4350E-03 -1.7423E-03 1.3545E-03 6.3198E-04 3.6963E-04 2.9430E-05 S8 -3.0961E-01 7.3906E-02 -1.0124E-02 5.6624E-03 1.8474E-04 9.6788E-04 -2.7478E-04 S9 -1.9526E-01 3.6301E-02 -1.0669E-02 2.3853E-03 -2.1646E-03 4.6320E-04 -3.7051E-04 S10 -1.6685E-01 1.1811E-01 -2.2421E-02 4.6537E-03 -8.4471E-03 -4.9529E-04 -3.2836E-04 S11 -4.2040E+00 1.0481E+00 -2.5842E-01 6.4111E-02 -3.6590E-02 2.0758E-02 -6.2941E-03 S12 -5.7353E+00 1.1167E+00 -3.2973E-01 1.4539E-01 -5.9279E-02 2.3488E-02 -1.4152E-02

[0073] Table 2-1

[0074] Face number A18 A20 A22 A24 A26 A28 A30 S1 -7.1348E-04 2.5041E-04 -1.4117E-04 5.8856E-05 -2.9057E-05 2.3227E-05 -2.9063E-06 S2 2.4035E-04 4.9365E-04 -4.1098E-06 -1.4047E-04 -5.4493E-05 3.9063E-05 1.6957E-05 S3 2.8778E-05 3.3929E-05 1.1165E-04 1.2477E-04 7.3486E-05 2.9477E-05 7.4294E-06 S4 -1.8767E-05 -3.2186E-05 -3.6329E-05 -2.6347E-05 -1.7528E-05 -6.5161E-06 -2.4467E-06 S5 -4.9182E-05 -3.8193E-05 -2.5539E-05 -1.8005E-05 -9.7962E-06 -4.1765E-06 0.0000E+00 S6 9.3466E-06 1.4517E-05 1.0943E-05 1.1261E-05 6.0367E-06 3.8777E-06 8.6677E-07 S7 2.1555E-05 -1.2339E-05 2.3707E-05 1.2111E-05 1.6050E-05 4.3018E-06 4.0507E-06 S8 1.1304E-05 -2.2350E-04 -8.1986E-05 -1.0808E-04 -3.9165E-05 -2.3229E-05 0.0000E+00 S9 1.6473E-04 -1.0475E-04 3.5704E-05 -1.2210E-05 8.6889E-06 -6.6096E-06 -2.4883E-07 S10 9.4286E-04 1.9312E-04 8.5293E-05 -2.6579E-05 6.8533E-05 3.6496E-05 1.9984E-05 S11 8.8119E-04 -1.0251E-03 1.4901E-03 -6.8594E-06 -4.6287E-04 7.0413E-05 3.5682E-04 S12 6.8706E-03 -2.1949E-03 1.2256E-03 -5.0322E-04 1.0129E-04 -3.0018E-04 1.4037E-04

[0075] Table 2-2

[0076] like Figure 2A and Figure 2B As shown, both optical imaging lens 1001 and optical imaging lens 1002 include seven spacer elements, namely, first spacer element P1, second spacer element P2, third spacer element P3, fourth spacer element P4, fifth spacer element P5, fifth sub-spacer element P5b and sixth spacer element P6. The first spacer element P1 is disposed between the first lens E1 and the second lens E2 and is in contact with the image side of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and is in contact with the image side of the second lens E2; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4 and is in contact with the image side of the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and is in contact with the image side of the fourth lens E4; the fifth spacer element P5 and the fifth sub-spacer element P5b are disposed between the fifth lens E5 and the sixth lens E6, and the fifth spacer element P5 is in contact with the image side of the fifth lens E5. The fifth sub-spacer element P5b can also be called an auxiliary spacer element. The object side of the fifth sub-spacer element P5b is in contact with the fifth spacer element P5 located on its object side, and the image side of the fifth sub-spacer element P5b is in contact with the object side of the sixth lens E6 located on its image side; the sixth spacer element P6 is disposed on the image side of the sixth lens E6 and is in contact with the image side of the sixth lens E6.

[0077] In this embodiment, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth sub-spacer element P5b of the optical imaging lens 1001 are spacers, the fifth spacer element P5 is a spacer ring, and the sixth spacer element P6 is a retaining ring. Similarly, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5 of the optical imaging lens 1002 are spacers, the fifth sub-spacer element P5b is a spacer ring, and the sixth spacer element P6 is a retaining ring. These seven spacers can block excess external light from entering, allowing the lens to better contact the lens barrel and enhancing the structural stability of both the optical imaging lens 1001 and the optical imaging lens 1002.

[0078] Table 3 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 1001 and 1002 in Embodiment 1. Exemplarily, the maximum height L of the lens barrel along the optical axis of both optical imaging lenses 1001 and 1002 is 5.54 mm. The difference between optical imaging lenses 1001 and 1002 lies in the structural dimensions of their spacer elements.

[0079] Example parameters Optical Imaging Lens 1001 Optical imaging lens 1002 d3s 1.69 1.69 EP45 0.4 0.4 CP4 0.02 0.02 D5m 7.32 7.58 d5m 6.64 3.67 d5s 5.46 3.67 d6s 8.16 8.16 d4s 2.69 2.69 CP3 0.02 0.02 D1s 6.24 4.86 d2s 1.24 1.24 EP56 0.62 1.2 CP1 0.02 0.02 L 5.54 5.54 CP5 0.582 0.018 CP6 0.452 0.452

[0080] Table 3

[0081] Figure 3A The on-axis chromatic aberration curves of optical imaging lenses 1001 and 1002 of Embodiment 1 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B The astigmatism curves of optical imaging lenses 1001 and 1002 of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of optical imaging lens 1001 and optical imaging lens 1002 of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curves of optical imaging lenses 1001 and 1002 of Embodiment 1 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 3A to 3D It can be seen that the optical imaging lens 1001 and optical imaging lens 1002 given in Example 1 can achieve good imaging quality.

[0082] Example 2

[0083] The following is for reference Figures 4A to 5D The optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 4A to 4BSchematic diagrams of the optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are shown respectively.

[0084] like Figure 4A and Figure 4B As shown, both optical imaging lens 2001 and optical imaging lens 2002 include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P6.

[0085] like Figure 4A and Figure 4B As shown, optical imaging lenses 2001 and 2002 employ the same imaging lens group. The imaging lens group of optical imaging lenses 2001 and 2002, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive 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 concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex 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. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged onto the imaging plane (not shown).

[0086] In this example, the effective focal length f1 of the first lens is -3.29mm, the effective focal length f2 of the second lens is 7.36mm, the effective focal length f4 of the fourth lens is -3.16mm, the effective focal length f5 of the fifth lens is 3.21mm, the effective focal length f6 of the sixth lens is 770.30mm, and half of the maximum field of view of the optical imaging lens (Semi-FOV) is 60.8°.

[0087] Table 4 shows the basic parameters of the imaging lens groups of optical imaging lens 2001 and optical imaging lens 2002 in Embodiment 2, wherein the units of radius of curvature and thickness / distance are millimeters (mm). Tables 5-1 and 5-2 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.

[0088]

[0089]

[0090] Table 4

[0091] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.4916E+00 -2.4173E-01 6.8209E-02 -2.4312E-02 8.9449E-03 -3.4448E-03 1.3872E-03 S2 5.9046E-01 -1.7282E-01 3.2107E-03 6.0150E-03 5.4812E-03 -2.0450E-03 -1.2795E-03 S3 -2.4803E-01 -4.6505E-03 1.2197E-02 -1.3958E-03 -1.6811E-03 -2.5656E-04 1.3733E-04 S4 -3.2663E-02 6.4306E-03 5.2612E-03 1.2078E-03 3.6095E-04 1.3825E-04 8.8667E-05 S5 1.1511E-02 -6.5869E-04 -2.5743E-04 -1.0452E-04 -8.3034E-05 -6.5712E-05 -4.9257E-05 S6 -5.3591E-02 1.1036E-04 -2.4739E-04 7.5424E-05 8.8991E-05 5.3171E-05 5.5745E-05 S7 -2.3742E-01 4.7466E-03 -3.5407E-04 9.7223E-04 4.5921E-04 2.9963E-04 4.0490E-05 S8 -3.1584E-01 7.3372E-02 -7.3379E-03 3.8788E-03 5.9296E-05 1.1515E-03 2.4008E-05 S9 -2.0046E-01 3.8515E-02 -8.8159E-03 4.1350E-03 -2.1323E-03 6.1030E-04 -4.1750E-04 S10 -1.7886E-01 1.1543E-01 -2.6861E-02 3.0294E-03 -9.8064E-03 -9.4842E-04 7.4536E-04 S11 -4.0053E+00 9.7640E-01 -2.3711E-01 5.7391E-02 -3.3506E-02 1.7745E-02 -4.4722E-03 S12 -5.7110E+00 1.1392E+00 -3.3885E-01 1.4288E-01 -6.1563E-02 2.3772E-02 -1.3890E-02

[0092] Table 5-1

[0093] Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.3960E-04 2.5606E-04 -1.2617E-04 3.8782E-05 -2.9164E-05 1.6947E-05 -1.4894E-06 S2 1.7931E-04 4.8264E-04 2.3195E-05 -1.3016E-04 -4.7848E-05 3.0329E-05 7.5584E-06 S3 3.3926E-05 4.6190E-05 9.8333E-05 1.0516E-04 6.5949E-05 3.1181E-05 8.4079E-06 S4 4.8446E-05 2.2306E-05 8.0251E-06 7.1758E-07 -1.9996E-06 -6.0778E-07 -6.3923E-07 S5 -3.4258E-05 -2.8294E-05 -2.1391E-05 -1.5249E-05 -7.5312E-06 -2.7293E-06 0.0000E+00 S6 4.5061E-05 4.9455E-05 3.6125E-05 2.9202E-05 1.4660E-05 7.3447E-06 6.9320E-07 S7 4.6778E-05 1.8890E-05 4.9108E-05 2.5657E-05 2.4529E-05 7.4733E-06 4.5662E-06 S8 2.7689E-04 -9.6344E-06 8.1140E-05 -2.3897E-05 4.0812E-06 -1.7541E-05 0.0000E+00 S9 2.7331E-04 -1.2226E-04 4.3565E-05 -2.6300E-05 2.0212E-05 -6.6387E-06 6.2973E-07 S10 1.9621E-03 4.0603E-04 -1.6002E-04 -2.2195E-04 8.8554E-06 2.4048E-05 6.6831E-06 S11 -7.4985E-05 -6.4272E-04 1.7544E-03 3.4137E-04 -5.8475E-04 -2.3873E-04 1.7823E-04 S12 6.9448E-03 -1.8826E-03 1.2457E-03 -5.3789E-04 1.2072E-04 -3.1105E-04 1.3139E-04

[0094] Table 5-2

[0095] like Figure 4A As shown, the optical imaging lens 2001 includes seven spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, the fifth sub-spacer element P5b, and the sixth spacer element P6. The first spacer element P1 is disposed between the first lens E1 and the second lens E2 and is in contact with the image side of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and is in contact with the image side of the second lens E2; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4 and is in contact with the image side of the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and is in contact with the image side of the fourth lens E4; the fifth spacer element P5 and the fifth sub-spacer element P5b are disposed between the fifth lens E5 and the sixth lens E6, and the fifth spacer element P5 is in contact with the image side of the fifth lens E5. The fifth sub-spacer element P5b can also be called an auxiliary spacer element. The object side of the fifth sub-spacer element P5b is in contact with the fifth spacer element P5 located on its object side, and the image side of the fifth sub-spacer element P5b is in contact with the object side of the sixth lens E6 located on its image side; the sixth spacer element P6 is disposed on the image side of the sixth lens E6 and is in contact with the image side of the sixth lens E6. In this embodiment, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth sub-spacer element P5b of the optical imaging lens 2001 are spacers, the fifth spacer element P5 is a spacer ring, and the sixth spacer element P6 is a pressure ring. The above seven spacer elements can block excess external light from entering, allowing the lens to better support the lens barrel and enhancing the structural stability of the optical imaging lens 2001.

[0096] like Figure 4BAs shown, the optical imaging lens 2002 includes eight spacer elements, 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 fifth sub-spacer element P5b, a fifth secondary sub-spacer element P5c, and a sixth spacer element P6. Specifically, the first spacer element P1 is disposed between the first lens E1 and the second lens E2 and contacts the image-side surface of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and contacts the image-side surface of the second lens E2; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4 and contacts the image-side surface of the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and contacts the image-side surface of the fourth lens E4; the fifth spacer element P5, the fifth sub-spacer element P5b, and the fifth secondary sub-spacer element P5c are disposed between the fifth lens E5 and the sixth lens E6, and the fifth spacer element P6... The fifth sub-spacer element P5b and the fifth secondary sub-spacer element P5c are both considered auxiliary spacers. The object-side surface of the fifth sub-spacer element P5b is in contact with the fifth spacer element P5 located on its object-side surface. The image-side surface of the fifth secondary sub-spacer element P5c is in contact with the object-side surface of the sixth lens E6 located on its image-side surface. The fifth sub-spacer element P5b is disposed between the fifth spacer element P5 and the fifth secondary sub-spacer element P5c, and the image-side surface of the fifth sub-spacer element P5b is in contact with the object-side surface of the fifth secondary sub-spacer element P5c. The sixth spacer element P6 is disposed on the image-side surface of the sixth lens E6 and is in contact with the image-side surface of the sixth lens E6. In this embodiment, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, and the fifth secondary sub-spacer element P5c of the optical imaging lens 2002 are spacers, the fifth sub-spacer element P5b is a spacer ring, and the sixth spacer element P6 is a pressure ring. The aforementioned eight spacers can block excess external light from entering, allowing the lens to better support the lens barrel and enhancing the structural stability of the optical imaging lens 2002.

[0097] Table 6 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 2001 and 2002 in Embodiment 2. Exemplarily, the maximum height L of the lens barrel along the optical axis of both optical imaging lenses 2001 and 2002 is 5.54 mm. The difference between optical imaging lenses 2001 and 2002 lies in the structural dimensions of the spacer element.

[0098]

[0099]

[0100] Table 6

[0101] Figure 5A The on-axis chromatic aberration curves of optical imaging lenses 2001 and 2002 of Embodiment 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B The astigmatism curves of optical imaging lenses 2001 and 2002 of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curves of optical imaging lens 2001 and optical imaging lens 2002 of Embodiment 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of optical imaging lenses 2001 and 2002 of Embodiment 2 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 5A to 5D It can be seen that the optical imaging lens 2001 and optical imaging lens 2002 given in Example 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following is for reference Figures 6A to 7D The optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are described. Figures 6A to 6B Schematic diagrams of the optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are shown respectively.

[0104] like Figure 6A and Figure 6B As shown, both optical imaging lens 3001 and optical imaging lens 3002 include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P6.

[0105] like Figure 6A and Figure 6BAs shown, optical imaging lenses 3001 and 3002 employ the same imaging lens group. The imaging lens group of optical imaging lenses 3001 and 3002, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive 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 concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex 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. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged onto the imaging plane (not shown).

[0106] In this example, the effective focal length f1 of the first lens is -3.30mm, the effective focal length f2 of the second lens is 6.98mm, the effective focal length f4 of the fourth lens is -3.28mm, the effective focal length f5 of the fifth lens is 3.39mm, the effective focal length f6 of the sixth lens is 237.14mm, and half of the maximum field of view of the optical imaging lens (Semi-FOV) is 60.7°.

[0107] Table 7 shows the basic parameters of the imaging lens groups of optical imaging lenses 3001 and 3002 in Embodiment 3, wherein the units of radius of curvature and thickness / distance are millimeters (mm). Tables 8-1 and 8-2 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.

[0108]

[0109] Table 7

[0110] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.4863E+00 -2.4293E-01 6.8180E-02 -2.4195E-02 8.9773E-03 -3.4419E-03 1.3895E-03 S2 5.9071E-01 -1.7348E-01 3.1180E-03 6.1725E-03 5.4472E-03 -2.0863E-03 -1.2825E-03 S3 -2.4958E-01 -5.6838E-03 1.2791E-02 -1.1658E-03 -1.6527E-03 -2.7124E-04 1.0619E-04 S4 -3.2914E-02 6.5147E-03 5.4531E-03 1.2699E-03 4.1410E-04 1.3933E-04 8.9708E-05 S5 1.1283E-02 -6.7046E-04 -2.9348E-04 -1.2370E-04 -9.9754E-05 -5.6259E-05 -2.5252E-05 S6 -5.2348E-02 -1.9963E-04 -2.2396E-04 5.9307E-05 9.5751E-06 -1.4385E-05 1.8470E-05 S7 -2.3506E-01 5.0551E-03 -6.4051E-04 1.2749E-03 4.6966E-04 2.1758E-04 -4.4686E-05 S8 -3.1529E-01 7.3127E-02 -8.7292E-03 5.0397E-03 1.2155E-04 1.0157E-03 -1.6504E-04 S9 -1.9479E-01 3.7768E-02 -1.0519E-02 2.7671E-03 -2.3605E-03 5.3873E-04 -3.9784E-04 S10 -1.6334E-01 1.2208E-01 -2.3404E-02 4.6276E-03 -8.3086E-03 -6.5941E-04 -1.1884E-04 S11 -4.1892E+00 1.0482E+00 -2.6420E-01 6.6109E-02 -3.5664E-02 2.1004E-02 -5.4973E-03 S12 -5.6890E+00 1.1376E+00 -3.3482E-01 1.4422E-01 -6.0316E-02 2.3842E-02 -1.4077E-02

[0111] Table 8-1

[0112]

[0113]

[0114] Table 8-2

[0115] like Figure 6AAs shown, the optical imaging lens 3001 includes seven spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, the fifth sub-spacer element P5b, and the sixth spacer element P6. The first spacer element P1 is disposed between the first lens E1 and the second lens E2 and is in contact with the image side of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and is in contact with the image side of the second lens E2; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4 and is in contact with the image side of the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and is in contact with the image side of the fourth lens E4; the fifth spacer element P5 and the fifth sub-spacer element P5b are disposed between the fifth lens E5 and the sixth lens E6, and the fifth spacer element P5 is in contact with the image side of the fifth lens E5. The fifth sub-spacer element P5b can also be called an auxiliary spacer element. The object side of the fifth sub-spacer element P5b is in contact with the fifth spacer element P5 located on its object side, and the image side of the fifth sub-spacer element P5b is in contact with the object side of the sixth lens E6 located on its image side; the sixth spacer element P6 is disposed on the image side of the sixth lens E6 and is in contact with the image side of the sixth lens E6. In this embodiment, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth sub-spacer element P5b of the optical imaging lens 3001 are spacers, the fifth spacer element P5 is a spacer ring, and the sixth spacer element P6 is a pressure ring. The above seven spacers can block excess external light from entering, allowing the lens to better fit against the lens barrel and enhancing the structural stability of the optical imaging lens 3001.

[0116] like Figure 6BAs shown, the optical imaging lens 3002 includes eight spacer elements, 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 fifth sub-spacer element P5b, a fifth secondary sub-spacer element P5c, and a sixth spacer element P6. Specifically, the first spacer element P1 is disposed between the first lens E1 and the second lens E2 and contacts the image-side surface of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and contacts the image-side surface of the second lens E2; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4 and contacts the image-side surface of the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and contacts the image-side surface of the fourth lens E4; the fifth spacer element P5, the fifth sub-spacer element P5b, and the fifth secondary sub-spacer element P5c are disposed between the fifth lens E5 and the sixth lens E6, and the fifth spacer element P6... The fifth sub-spacer element P5b and the fifth secondary sub-spacer element P5c are in contact with the image side of the fifth lens E5. They can also be referred to as auxiliary spacer elements. The object side of the fifth sub-spacer element P5b is in contact with the fifth spacer element P5 located on its object side. The image side of the fifth secondary sub-spacer element P5c is in contact with the object side of the sixth lens E6 located on its image side. The fifth sub-spacer element P5b is disposed between the fifth spacer element P5 and the fifth secondary sub-spacer element P5c, and its image side is in contact with the object side of the fifth secondary sub-spacer element P5c. The sixth spacer element P6 is disposed on the image side of the sixth lens E6 and is in contact with it. In this embodiment, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, and the fifth secondary sub-spacer element P5c of the optical imaging lens 3002 are spacers, the fifth sub-spacer element P5b is a spacer ring, and the sixth spacer element P6 is a pressure ring. The aforementioned eight spacers can block excess external light from entering, allowing the lens to better support the lens barrel and enhancing the structural stability of the optical imaging lens 3002.

[0117] Table 9 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 3001 and 3002 in Embodiment 3. Exemplarily, the maximum height L of the lens barrel along the optical axis of both optical imaging lenses 3001 and 3002 is 5.58 mm. The difference between optical imaging lenses 3001 and 3002 lies in the structural dimensions of the spacer element.

[0118] Example parameters Optical Imaging Lens 3001 Optical Imaging Lens 3002 d3s 1.72 1.71 EP45 1.10 0.52 CP4 0.02 0.02 D5m 7.32 7.58 d5m 6.64 3.47 d5s 5.46 3.47 d6s 8.16 8.16 d4s 2.45 2.44 CP3 0.02 0.02 D1s 6.24 4.86 d2s 1.24 1.24 EP56 0.64 1.20 CP1 0.02 0.02 L 5.58 5.58 CP5 0.582 0.018 CP6 0.452 0.452

[0119] Table 9

[0120] Figure 7AThe on-axis chromatic aberration curves of optical imaging lenses 3001 and 3002 of Embodiment 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of optical imaging lenses 3001 and 3002 of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of optical imaging lenses 3001 and 3002 of Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of optical imaging lenses 3001 and 3002 in Embodiment 3 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 7A to 7D It can be seen that the optical imaging lens 3001 and optical imaging lens 3002 given in Example 3 can achieve good imaging quality.

[0121] In summary, the optical imaging lenses 1001, 1002, 2001, 2002, 3001 and 3002 of Examples 1 to 3 satisfy the relationships shown in Table 10.

[0122] Conditional / Optical Imaging Lens 1001 1002 2001 2002 3001 3002 d3s / (R5+R6) 6.24 6.24 10.35 10.22 5.22 5.19 (CT5+T45)×EP45 / (CP4×f4) -6.28 -6.28 -5.52 -5.52 -17.18 -8.09 |f6×CP1 / (CP5×f5+f1×CP6)| 8.86 2.95 36.26 9.70 8.85 2.98 (R7+R8) / (D5m-d5m) -6.06 -1.05 -6.58 -1.14 -7.42 -1.23 (d5s+d6s) / (CT6+T56) 13.10 11.37 12.07 10.48 12.46 10.64 (d4s-EP45) / CT4 8.88 8.88 6.63 6.56 4.50 6.42 CT3 / CP3-CT4 / CP4 17.40 17.40 12.29 12.29 11.11 11.11 (D1s-d2s)×f2-(D5m×EP56) 31.63 17.10 32.09 17.54 30.24 16.20 (R1+R2) / CP1 117.36 117.36 134.83 134.83 134.60 134.60 f6 / R11+R7 / CP4 -183.56 -183.56 310.78 310.78 -224.07 -224.07 D1s×tan(Semi-FOV) / (∑AT-L) -3.13 -2.44 -3.22 -2.51 -3.16 -2.46

[0123] Table 10

[0124] 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.

[0125] 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, include: The imaging lens group, along the optical axis from the object side to the image side, includes, in sequence: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power. A plurality of spacer elements, including a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; and The lens barrel is used to house the imaging lens group and the plurality of spacer elements; wherein, The optical imaging lens has six lenses with optical power. The object-side surface of the first lens is concave, and the image-side surface is also concave. The object side of the fourth lens is concave, and the image side is also concave. The object-side surface of the sixth lens is convex, and the image-side surface is concave. The radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the outer diameter D5m of the image side of the fifth spacer element, and the inner diameter d5m of the image side of the fifth spacer element satisfy: -7.42≤(R7+R8) / (D5m-d5m)≤-1.05; The maximum thickness CP1 of the first spacer element along the optical axis, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: 117.36≤(R1+R2) / CP1≤134.

83.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, wherein, The inner diameter d3s of the object side of the third spacer element, the radius of curvature R5 of the object side of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy: 5.19≤d3s / (R5+R6)≤10.

35.

3. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, wherein, The effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the gap EP45 between the fourth and fifth spacers element along the optical axis satisfy: -17.18≤(CT5+T45)×EP45 / (CP4×f4)≤-5.

52.

4. The optical imaging lens according to any one of claims 1 to 3, characterized in that, The outer diameter D1s of the object side of the first spacer element, half of the maximum field of view of the optical imaging lens (Semi-FOV), the sum of the air gaps ∑AT between any two adjacent lenses from the first lens to the sixth lens on the optical axis, and the maximum height L of the lens barrel along the optical axis satisfy: -3.22≤D1s×tan(Semi-FOV) / (∑AT-L)≤-2.

44.

5. The optical imaging lens according to any one of claims 1 to 3, characterized in that, The plurality of spacer elements further includes a sixth spacer element disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens, wherein, The inner diameter d5s of the object side of the fifth spacer element, the inner diameter d6s of the object side of the sixth spacer element, the center thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy: 10.48≤(d5s+d6s) / (CT6+T56)≤13.

10.

6. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, wherein, The inner diameter d4s of the object side of the fourth spacer, the spacing EP45 between the fourth spacer and the fifth spacer along the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy: 4.50≤(d4s-EP45) / CT4≤8.

88.

7. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, wherein, The center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer element along the optical axis, and the maximum thickness CP4 of the fourth spacer element along the optical axis satisfy: 11.11≤CT3 / CP3-CT4 / CP4≤17.

40.

8. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a sixth spacer element disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens, wherein, The effective focal length f1 of the first lens, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the maximum thickness CP1 of the first spacer element along the optical axis, the maximum thickness CP5 of the fifth spacer element along the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy: 2.95≤|f6×CP1 / (CP5×f5+f1×CP6)|≤36.

26.

9. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, wherein, The effective focal length f6 of the sixth lens, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R11 of the object side surface of the sixth lens, and the maximum thickness CP4 of the fourth spacer element along the optical axis satisfy: -224.07≤f6 / R11+R7 / CP4≤310.

78.

10. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes at least one auxiliary spacer placed between any two adjacent lenses, wherein the object side of the auxiliary spacer is in contact with a spacer or other auxiliary spacer located on its object side, and the image side of the auxiliary spacer is in contact with a lens or other auxiliary spacer located on its image side.

11. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a second spacer element disposed between the second lens and the third lens and in contact with the image-side surface of the second lens, and a sixth spacer element disposed between the image-side surface of the sixth lens and in contact with the image-side surface of the sixth lens; wherein, The outer diameter D1s of the object side of the first spacer element, the inner diameter d2s of the object side of the second spacer element, the effective focal length f2 of the second lens, the outer diameter D5m of the image side of the fifth spacer element, and the spacing EP56 between the fifth spacer element and the sixth spacer element along the optical axis satisfy: 16.20≤(D1s-d2s)×f2-(D5m×EP56)≤32.09.

Images