Optical imaging lens

Abstract

The utility model discloses an optical imaging lens which comprises a lens cone, a lens group and a spacing element group, and the lens group and the spacing element group are arranged in the lens cone. The lens group sequentially comprises a first lens with negative focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power and a sixth lens with negative focal power from the object side to the image side along the optical axis. The image side surfaces of the second lens, the third lens and the fifth lens are convex surfaces. The object side surface and the image side surface of the fourth lens are convex surfaces or concave surfaces. The spacing element group includes a first spacing element. The optical imaging lens satisfies the following conditions:-3.45 lt; r1 / flt; 2.75 and 0.75 lt, 0.75 lt; 2 * Yc11 / d1slt; 1.25, 1.25; wherein R1 is the curvature radius of the object side surface of the first lens, f is the effective focal length of the optical imaging lens, Yc11 is the distance from the inflection point farthest from the optical axis in the effective diameter of the object side surface of the first lens to the optical axis, and d1s is the maximum inner diameter of the object side surface of the first spacing element in the direction perpendicular to the optical axis.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular, to an optical imaging lens. BACKGROUND

[0002] With the innovation of technology, the update iteration of consumer electronic devices such as mobile phones and tablet computers is accelerating, and the market has higher and higher requirements for product end optical lenses. Not only is it required that the imaging lens has high pixels, large image surface and large viewing angle, but also it is required that the imaging lens has smaller mechanical size to meet the electronic design to obtain the demand of larger screen ratio.

[0003] In the current six-piece optical imaging lens, in order to realize the design of a wide-angle optical system, the first lens is usually set to have a negative focal power, and the inflection point position has a greater impact on the MTF (modulation transfer function) performance. When the inflection point is too close to the optical axis, the field curvature offset of the outer field of view will become serious. When the inflection point is too close to the maximum effective radius of the first lens, more of the outer field of view is intercepted, resulting in blurred imaging. Therefore, how to design a lens that can achieve a large viewing angle and at the same time minimize the risk of edge field of view performance is one of the contradictions that the person skilled in the art needs to solve. CONTENT OF THE UTILITY MODEL

[0004] The first aspect of the present application provides such an optical imaging lens, which comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group comprises, in order from the object side to the image side along the optical axis, a first lens having a negative focal power, a second lens having a focal power, a third lens having a focal power, a fourth lens having a focal power, a fifth lens having a focal power, and a sixth lens having a negative focal power. The image side surface of the first lens is concave. The image side surfaces of the second lens, the third lens and the fifth lens are all convex. The object side surface and the image side surface of the fourth lens are both convex or both concave. The spacer element group comprises a first spacer element. The optical imaging lens satisfies -3.45 < R1 / f < 2.75 and 0.75 < 2 x Yc11 / d1s < 1.25; wherein R1 is the curvature radius of the object side surface of the first lens, f is the effective focal length of the optical imaging lens, Yc11 is the distance from the inflection point farthest from the optical axis in the effective diameter of the object side surface of the first lens to the optical axis, and d1s is the maximum inner diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis.

[0005] In one embodiment, the optical imaging lens satisfies 2.95 < EP01 / CT1 < 3.50, wherein EP01 is the distance from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis, and CT1 is the center thickness of the first lens in the optical axis.

[0006] In one embodiment, the optical imaging lens satisfies: 1.85 < (D1s-d1s) / DT12 < 2.75, where D1s is the maximum outer diameter of the object side surface of the first spacer element in a direction perpendicular to the optical axis, d1s is the maximum inner diameter of the object side surface of the first spacer element in a direction perpendicular to the optical axis, and DT12 is the maximum effective radius of the image side surface of the first lens.

[0007] In one embodiment, the spacer element group includes: a third spacer element and a fourth spacer element, where the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: 3.45 < EP34 / |SAG51| + EP34 / |SAG52| < 14.10, where EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis, SAG51 is the on-axis distance between the intersection of the object side surface of the fifth lens and the optical axis and the effective radius vertex of the object side surface of the fifth lens, and SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens.

[0008] In one embodiment, the spacer element group includes: a fourth spacer element, where the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: -3.5 < (D4s / d4s) / (R7 / R8) < -0.6, where D4s is the maximum outer diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, d4s is the maximum inner diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0009] In one embodiment, the spacer element group further includes: a fifth spacer element, where the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the optical imaging lens satisfies: -1.10 < (d0m-d5m) / f5 < 2.00, where d0m is the maximum inner diameter of the image side end surface of the lens barrel in a direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, and f5 is the effective focal length of the fifth lens.

[0010] In an embodiment, the spacer element set further comprises: a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 0.30≤(d5s-d4s) / |SAG52|≤3.90, wherein d5s is the maximum inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, d4s is the maximum inner diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, and SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens.

[0011] In an embodiment, the spacer element set further comprises: a third spacer element and a fourth spacer element, wherein the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the optical imaging lens satisfies: 0.60<CT4 / EP34<1.90, wherein CT4 is the center thickness of the fourth lens in the optical axis direction, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction.

[0012] In an embodiment, the optical imaging lens satisfies: 10.35<D1s / |SAG12|<18.35, wherein D1s is the maximum outer diameter of the object side surface of the first spacer element in a direction perpendicular to the optical axis, and SAG12 is the on-axis distance between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens.

[0013] In an embodiment, the spacer element set further comprises: a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the optical imaging lens satisfies: -3.00<R3 / d2s+R5 / D3s<1.15, wherein R3 is the radius of curvature of the object side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, d2s is the maximum inner diameter of the object side surface of the second spacer element in a direction perpendicular to the optical axis, and D3s is the maximum outer diameter of the object side surface of the third spacer element in a direction perpendicular to the optical axis.

[0014] In one embodiment, the spacer element set further comprises: a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; and the optical imaging lens satisfies: 0.55 < |R4 / D2m| + |R6 / D3m| < 1.85, wherein R4 is the curvature radius of the image side surface of the second lens, R6 is the curvature radius of the image side surface of the third lens, D2m is the maximum outer diameter of the image side surface of the second spacer element in a direction perpendicular to the optical axis, and D3m is the maximum outer diameter of the image side surface of the third spacer element in a direction perpendicular to the optical axis.

[0015] In one embodiment, the spacer element set further comprises: a second spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; and the optical imaging lens satisfies: 2.40 < EP02 / T12 < 2.75, wherein EP02 is the distance from the object side end surface of the lens barrel to the object side surface of the second spacer element along the optical axis, and T12 is the air interval of the first lens and the second lens on the optical axis.

[0016] In one embodiment, the spacer element set comprises: a second spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; and the optical imaging lens satisfies: 1.35 < |f12| / d2s < 7.60, wherein f12 is the combined focal length of the first lens and the second lens, and d2s is the maximum inner diameter of the object side surface of the second spacer element in a direction perpendicular to the optical axis.

[0017] In one embodiment, the optical imaging lens further comprises an autofocus assembly disposed between the third lens and the fourth lens.

[0018] The second aspect of the present application provides such an optical imaging lens, which comprises a lens barrel, and a lens set and a spacer set arranged in the lens barrel, wherein the lens set comprises, in order from the object side to the image side along the optical axis, a first lens with negative refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with refractive power, and a sixth lens with negative refractive power. The image side surface of the second lens, the third lens and the fifth lens are all convex. The object side surface and the image side surface of the fourth lens are both convex or both concave. The spacer set comprises a first spacer. The optical imaging lens satisfies -3.45 < R1 / f < 2.75 and 1.85 < (D1s-d1s) / DT12 < 2.75, wherein R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, D1s is the maximum outer diameter of the object side surface of the first spacer in the direction perpendicular to the optical axis, d1s is the maximum inner diameter of the object side surface of the first spacer in the direction perpendicular to the optical axis, and DT12 is the maximum effective radius of the image side surface of the first lens.

[0019] The present application provides a six-piece optical imaging lens, the first lens of which has negative refractive power and the sixth lens has negative refractive power, and the optical imaging lens satisfies 3.45 < R1 / f < 2.75. By controlling the curvature radius of the object side surface of the first lens within a certain range, the off-axis aberration of the system can be effectively corrected, and meanwhile, the lens can achieve good wide-angle characteristics. However, the off-axis light performance is also affected by the inflection point position under the condition of ensuring the wide-angle characteristics. Since the first lens has negative refractive power, the effective radius of the object side surface thereof is often designed to be relatively large, and thus the inflection point position has a relatively large influence on the MTF performance. The present application designs a first spacer on the image side surface of the first lens, and makes the optical imaging lens satisfy 0.75 < 2×Yc11 / d1s < 1.25, thereby controlling the inner diameter of the object side surface of the first spacer and intercepting non-imaging light as much as possible. Meanwhile, by controlling the inflection point position of the object side surface of the first lens, the influence of the inflection point position of the object side surface of the first lens on the off-axis light can be reduced, the MTF performance of the lens is ensured, and the imaging stability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other characteristics, objectives and advantages of the present application will become more apparent from the following detailed description of the non-restrictive embodiments, made with reference to the accompanying drawings:

[0021] Figure 1 The structural arrangement diagram of an optical imaging lens according to the present application and the schematic diagram of part of the parameters are shown;

[0022] Figure 2 The structural schematic diagram of the optical imaging lens according to the embodiment 1 of the present application is shown;

[0023] Figure 3 A structure diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0024] Figure 4 A structure diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0025] Figure 5 Axial chromatic aberration curves (A1), astigmatic curves (B1), distortion curves (C1) and magnification chromatic aberration curves (D1) of the optical imaging lenses of Embodiments 1 to 3 of the present application are shown;

[0026] Figure 6 A structure diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0027] Figure 7 A structure diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0028] Figure 8 A structure diagram of an optical imaging lens according to Embodiment 6 of the present application is shown;

[0029] Figure 9 Axial chromatic aberration curves (A2), astigmatic curves (B2), distortion curves (C2) and magnification chromatic aberration curves (D2) of the optical imaging lenses of Embodiments 4 to 6 of the present application are shown;

[0030] Figure 10 A structure diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0031] Figure 11 A structure diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0032] Figure 12 A structure diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;

[0033] Figure 13 Axial chromatic aberration curves (A3), astigmatic curves (B3), distortion curves (C3) and magnification chromatic aberration curves (D3) of the optical imaging lenses of Embodiments 7 to 9 of the present application are shown;

[0034] Figure 14 A defocus curve diagram of an optical imaging lens satisfying 2×Yc11 / d1s=1.06 is shown;

[0035] Figure 15 A defocus curve diagram of an optical imaging lens satisfying 2×Yc11 / d1s=0.5 is shown;

[0036] Figure 16A defocus curve graph is shown when the optical imaging lens satisfies 2*Yc11 / d1s = 2.75. DETAILED DESCRIPTION

[0037] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed description are only examples of illustrative embodiments of the present application and are not intended to limit the scope of the present application in any way. Identical reference numerals in the drawings represent identical elements throughout the specification. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] It is to be noted that the expressions first, second, third and the like in this specification merely distinguish one feature from another but do not denote any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0039] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0040] Those skilled in the art will appreciate that a lens is an optical member formed by two refracting surfaces surrounding a transparent medium. The refracting surfaces can be spherical surfaces (including a plane, i.e., a spherical surface with an infinite radius of curvature) and aspherical surfaces. The line connecting the centers of curvature of the two refracting surfaces is the optical axis of the lens. In this context, the surface of the two refracting surfaces closer to the object is referred to as the object side surface of the lens, and the surface closer to the imaging surface is referred to as the image side surface of the lens.

[0041] In this context, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made in accordance with the general method in the art, for example, judging the concavity and convexity by the sign of the R value (R refers to the radius of curvature in the paraxial region). In the case of 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. In the case of 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.

[0042] The schemes described in the embodiments of the present application can be simulated by software / tools such as ZEMAX, CODE V, etc., and the schemes of some embodiments can be simulated by, for example, CODE V. In the process of simulation by software / tools such as the above, the surface shape of the lens can be appropriately adjusted according to the surface shape model provided by the software / tools used.

[0043] It should also be understood that the use of the terms "including", "including", "having", "containing", and / or "containing" when used in this specification means that the presence of the stated features, elements and / or components, but not excluding the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of listed features, they modify the entire list of features, not individual elements in the list. In addition, when describing the embodiments of the present application, "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein.

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be interpreted as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application, for example, the lens group, the lens barrel and the spacer element in each embodiment of the present application can be combined arbitrarily, and are not limited to the combination of the lens group, the lens barrel, the spacer element, etc. in one embodiment.

[0046] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0047] For a six-piece wide-angle lens, important indicators such as large viewing angle, large image surface and ultra-thin often restrict each other. For example, the superposition of the two indicators of large viewing angle and ultra-thin increases the risk of stray light and MTF performance. Generally, the first lens of the six-piece wide-angle lens has negative focal power, which helps to achieve the design of the wide-angle optical system. By controlling the curvature radius of the object side of the first lens within a certain range, the off-axis aberration of the system is positively affected. However, the off-axis light performance is also affected by the effective radius and the inflection point position while ensuring the wide-angle characteristics. Specifically, since the first lens has negative focal power, the effective radius of the object side of the first lens is often designed to be relatively large, so the effective radius and the inflection point position have a greater impact on the MTF performance. When the inflection point is too close to the optical axis, the field curvature deviation in the outer field of view becomes serious. When the inflection point is too close to the maximum effective radius of the first lens, the performance drop trend in the outer field of view is serious, resulting in blurred edge images.

[0048] A first aspect of the present application provides such an optical imaging lens. The optical imaging lens can include a lens group, a spacer element group and a lens barrel, wherein the lens group and the spacer element group are arranged in the lens barrel. The lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative focal power, and the image side of the first lens is convex. The third lens has positive focal power, and the object side of the third lens is convex. The object side of the fourth lens is convex. The object side of the fifth lens is concave. The image side of the sixth lens is concave. The optical imaging lens satisfies 3.45 < R1 / f < 2.75. According to the optical imaging lens of the present application, by controlling the curvature radius of the object side of the first lens within a certain range, the off-axis aberration of the system is effectively corrected, and at the same time the lens realizes good wide-angle characteristics.

[0049] In an embodiment, the spacer element group can include a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side of the first lens. The optical imaging lens can satisfy 0.75 < 2 x Yc11 / d1s < 1.25, where Yc11 is the distance from the inflection point farthest from the optical axis in the effective radius of the object side of the first lens to the optical axis, and d1s is the maximum inner diameter of the object side of the first spacer element in the direction perpendicular to the optical axis. By controlling the inner diameter of the object side of the first spacer element, non-imaging light can be intercepted as much as possible. At the same time, by controlling the position of the inflection point of the object side of the first lens, the influence of the position of the inflection point of the object side of the first lens on the off-axis light can be reduced, the MTF performance of the lens is ensured, and the imaging stability is improved.

[0050] The following will be described in detail Figures 14 to 16, it is further illustrated that the optical imaging lens of the present application has good imaging stability when 3.45 < R1 / f < 2.75 and 0.75 < 2 x Yc11 / d1s < 1.25, which can ensure the stability of the MTF peak value. Exemplarily, Figure 14 The defocus curve diagram of the optical imaging lens 1 satisfying 2 x Yc11 / d1s = 1.06 is shown, Figure 15 The defocus curve diagram of the optical imaging lens 2 satisfying 2 x Yc11 / d1s = 0.5 is shown, Figure 16 The defocus curve diagram of the optical imaging lens 3 satisfying 2 x Yc11 / d1s = 2.75 is shown.

[0051] From the above, Figures 14 to 16 As can be seen from the above, the optical imaging lens 1 satisfies the range of 0.75 < 2 x Yc11 / d1s < 1.25 of the present application, that is, the distance from the effective radius of curvature point of the first lens to the optical axis and the inner diameter of the object side surface of the first spacer element are controlled within a reasonable range, which can intercept non-imaging light and ensure that the peak position of the defocus curve is relatively concentrated and the focal point converges well, thereby obtaining good imaging quality in each field of view. The optical imaging lens 2 and the optical imaging lens 3 do not satisfy the range of 0.75 < 2 x Yc11 / d1s < 1.25 of the present application, and the peak position of the defocus curve is relatively dispersed and the focal point is severely deviated. Specifically, the inflection point position of the optical imaging lens 2 is too close to the optical axis, which causes the light in the field of view outside 0.2F to be unable to converge, resulting in severe field curvature deviation and serious deterioration of MTF performance in the outer field of view. The inflection point position of the optical imaging lens 3 is too close to the inner diameter of the object side surface of the first spacer element, and the light in the outer field of view is intercepted more, resulting in blurred image quality in the field of view outside 0.8F and deteriorated MTF performance.

[0052] In one embodiment, the spacer element group can include a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens. The optical imaging lens can satisfy 1.85 < (D1s-d1s) / DT12 < 2.75, where D1s is the maximum outer diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, d1s is the maximum inner diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, and DT12 is the maximum effective radius of the image side surface of the first lens. By satisfying 1.85 < (D1s-d1s) / DT12 < 2.75, the contact area between the first lens and the first spacer element can be reasonably controlled by controlling the inner and outer diameters of the object side surface of the first spacer element and the maximum effective radius of the image side surface of the first lens, so as to prevent poor assembly stability caused by excessive step difference between the lens and the contact element during assembly.

[0053] In an example embodiment, the optical imaging lens can further include a diaphragm. The diaphragm can be disposed between the third lens and the fourth lens. It should be noted that the position of the diaphragm disclosed herein is only an example and is not a limitation; in alternative embodiments, the diaphragm can also be disposed at other positions as needed.

[0054] In an example embodiment, the set of spacer elements can include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, and a sixth spacer element. The first spacer element is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens. The second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens. The fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The sixth spacer element is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. It should be understood that the number of spacer elements is not specifically limited in the present application, and any number of spacer elements can be included between any two lenses, and any number of spacer elements can be included in the entire optical imaging lens. Reasonable use of spacer elements can effectively avoid stray light risk, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0055] In an example embodiment, the lens barrel can include a most object side end surface, a most image side end surface, an outer annular surface, and an inner annular surface, wherein the most object side end surface of the lens barrel is the object side end surface of the lens barrel, and the most image side end surface of the lens barrel is the image side end surface of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular surface of the lens barrel, and the surface of the lens barrel closest to the optical axis is the inner annular surface of the lens barrel.

[0056] In an example embodiment, the lens barrel can be a one-piece lens barrel or a split lens barrel.

[0057] In an example embodiment, the optical imaging lens can further include an autofocus assembly. The autofocus assembly is disposed between the third lens and the fourth lens, for example. The autofocus assembly has the advantages of low power consumption, fast focusing, and miniaturization, and can also eliminate temperature drift to ensure lens performance. It should be noted that the position of the autofocus assembly disclosed herein is only an example and is not a limitation; in alternative embodiments, the autofocus assembly can also be disposed at other positions as needed.

[0058] In an example embodiment, the first lens can have a negative focal power, the second lens can have a positive focal power or a negative focal power, the third lens can have a positive focal power or a negative focal power, the fourth lens can have a positive focal power or a negative focal power, the fifth lens can have a positive focal power or a negative focal power, and the sixth lens can have a negative focal power.

[0059] In an exemplary embodiment, the image-side surface of the first lens is a concave surface.

[0060] In an exemplary embodiment, the image-side surface of the second lens, the third lens and the fifth lens are all convex surfaces.

[0061] In an exemplary embodiment, the object-side surface and the image-side surface of the fourth lens are both convex or both concave.

[0062] In an exemplary embodiment, at least one of the lenses in the lens group can be a cut lens. The outer peripheral surface of the cut lens can have a cut portion and a non-cut portion, and the outer diameter of the cut portion of the lens is smaller than the outer diameter of the non-cut portion of the lens. When the outer peripheral surface of the lens has a cut portion, the outer diameter of the lens generally refers to the outer diameter of the non-cut portion of the lens.

[0063] In an exemplary embodiment, at least one of the spacer elements in the spacer element group can be a cut spacer element. The outer peripheral surface of the cut spacer element can have a cut portion and a non-cut portion, and the outer diameter of the cut portion of the spacer element is smaller than the outer diameter of the non-cut portion of the spacer element. The outer diameter of the spacer element generally refers to the maximum outer diameter of the non-cut portion.

[0064] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 2.95 < EP01 / CT1 < 3.50, wherein EP01 is the distance from the object-side end surface of the lens barrel to the object-side surface of the first spacer element along the optical axis direction, and CT1 is the central thickness of the first lens on the optical axis. Satisfying 2.95 < EP01 / CT1 < 3.50 can effectively control the thickness ratio of the first lens within a reasonable range, and ensure the stability of the medium thickness and the edge thickness of the first lens under external conditions such as high humidity, high temperature, and dropping, so as to ensure that the imaging effect of the lens is less affected by external interference.

[0065] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 3.45 < EP34 / |SAG51| + EP34 / |SAG52| < 14.10, where EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction, SAG51 is the on-axis distance between the intersection of the object side surface of the fifth lens and the optical axis and the effective radius vertex of the object side surface of the fifth lens, and SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens. Satisfying 3.45 < EP34 / |SAG51| + EP34 / |SAG52| < 14.10, reasonably setting the sag of the fifth lens, can effectively improve the off-axis chromatic aberration, chromatic spherical aberration, astigmatism, field curvature and the like of the system, and improve the overall imaging quality of the off-axis field. At the same time, controlling EP34 is conducive to controlling the radial height difference between the third spacer element, the fourth spacer element and the barrel, and conducive to the arrangement design of the lens flange mechanism, so as to minimize the difficulty and risk of assembly.

[0066] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: -3.5 < (D4s / d4s) / (R7 / R8) < -0.6, where D4s is the maximum outer diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis, d4s is the maximum inner diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis, R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens. Satisfying -3.5 < (D4s / d4s) / (R7 / R8) < -0.6 can effectively control the curvature radii of the object side surface and the image side surface of the fourth lens within a reasonable range, and at the same time, in combination with the control of the inner diameter of the object side surface of the fourth spacer element, the light rays of the edge field can have a reasonable field angle, the off-axis aberration can be corrected, and the imaging quality of the system can be improved.

[0067] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: -1.10 < (d0m-d5m) / f5 < 2.00, where d0m is the maximum inner diameter of the image side end surface of the barrel in the direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in the direction perpendicular to the optical axis, and f5 is the effective focal length of the fifth lens. Satisfying -1.10 < (d0m-d5m) / f5 < 2.00 can effectively control the inner diameter of the image side surface of the fifth spacer element, ensure effective interception of unnecessary light rays, control the volume and weight of the spacer element, reduce the difficulty of mold processing and molding, and ensure the imaging quality; the constraints on the effective focal length of the fifth lens and the inner diameter of the image side end surface of the barrel are conducive to the fifth lens to accept and transition the light rays of the front and rear lenses, adjust the light ray trend, make the imaging quality higher, and weaken the imaging distortion.

[0068] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 0.30≤(d5s-d4s) / |SAG52|≤3.90, where d5s is the maximum inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis, d4s is the maximum inner diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis, and SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens. Satisfying 0.30≤(d5s-d4s) / |SAG52|≤3.90, reasonably designing the sag of the image side surface of the fifth lens, can effectively control the uniformity of the structure of the fifth lens, effectively improve the off-axis chromatic aberration, chromatic aberration of coma, astigmatism, field curvature, etc. of the system, and improve the overall imaging quality of the off-axis field of view, which is conducive to the molding and processing of the lens; at the same time, by controlling the inner diameter of the object side surface of the fourth and fifth spacer elements, the stray light at the edge of the fourth lens can be effectively intercepted to ensure that the imaging device has high imaging quality.

[0069] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 0.60<CT4 / EP34<1.90, where CT4 is the center thickness of the fourth lens on the optical axis, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis. Satisfying 0.60<CT4 / EP34<1.90 can effectively control the thickness ratio of the fourth lens within a reasonable range, ensure the molding stability of the fourth lens, and effectively avoid the assembly deformation of the fourth lens during assembly.

[0070] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 10.35<D1s / |SAG12|<18.35, where D1s is the maximum outer diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, and SAG12 is the on-axis distance between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens. Satisfying 10.35<D1s / |SAG12|<18.35, reasonably designing the sag of the object side surface of the first lens, can effectively improve the off-axis chromatic aberration, chromatic aberration of coma, astigmatism, field curvature, etc. of the system, and improve the overall imaging quality of the off-axis field of view, which can effectively control the uniformity of the structure of the first lens, and is conducive to the molding and processing of the lens; at the same time, by controlling the outer diameter of the object side surface of the first spacer element, the stray light at the edge of the first lens can be effectively intercepted to ensure that the imaging device has high imaging quality.

[0071] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: -3.00 < R3 / d2s + R5 / D3s < 1.15, where R3 is the curvature radius of the object side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis, and D3s is the maximum outer diameter of the object side surface of the third spacer element in the direction perpendicular to the optical axis. Satisfying -3.00 < R3 / d2s + R5 / D3s < 1.15 helps to ensure the acceptance of light rays at the second lens and the third lens, so as to improve the imaging quality, while effectively intercepting unnecessary light rays.

[0072] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 0.55 < |R4 / D2m| + |R6 / D3m| < 1.85, where R4 is the curvature radius of the image side surface of the second lens, R6 is the curvature radius of the image side surface of the third lens, D2m is the maximum outer diameter of the image side surface of the second spacer element in the direction perpendicular to the optical axis, and D3m is the maximum outer diameter of the image side surface of the third spacer element in the direction perpendicular to the optical axis. Satisfying 0.55 < |R4 / D2m| + |R6 / D3m| < 1.85 can reasonably control the shape of the image side surface of the second lens and the third lens, which is conducive to lens processing and ensures the stability of lens forming process, while controlling the outer diameter of the image side surface of the second spacer element and the third spacer element can effectively intercept non-imaging light rays and improve the imaging quality of the imaging device.

[0073] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 2.40 < EP02 / T12 < 2.75, where EP02 is the distance between the object side end surface of the lens barrel and the object side surface of the second spacer element along the optical axis, and T12 is the air gap between the first lens and the second lens in the optical axis. Satisfying 2.40 < EP02 / T12 < 2.75 can reasonably control the radial step difference between the second spacer element and the lens barrel by controlling the distance between the object side end surface of the lens barrel and the object side surface of the second spacer element and the distance between the first lens and the second lens, so as to prevent poor assembly stability caused by excessive step difference between the lens and the supporting member during assembly.

[0074] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 1.35 < |f12| / d2s < 7.60, where f12 is the combined focal length of the first lens and the second lens, and d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis. Satisfying 1.35 < |f12| / d2s < 7.60, by controlling the combined focal length of the first lens and the second lens, ensures better imaging of the imaging system to the image plane, improving the imaging quality of the lens; and controlling the inner diameter of the object side surface of the second spacer element is conducive to ensuring the arrangement stability of the lens structure, ensuring the connection of the front and rear imaging systems, and improving the assembly stability.

[0075] In embodiments of the present application, at least one of the mirror surfaces of each lens is a non-spherical mirror surface, i.e., at least one of the mirror surfaces of the object side surface of the first lens to the image side surface of the sixth lens is a non-spherical mirror surface. The characteristic of a non-spherical lens is that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, a non-spherical lens has better curvature radius characteristics, with the advantages of improving distortion aberration and improving astigmatism aberration. After adopting a non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Alternatively, the object side surface and the image side surface of all of the first lens to the sixth lens are non-spherical mirror surfaces.

[0076] In exemplary embodiments, the above optical imaging lens can further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging plane.

[0077] It should be understood that the present application focuses on the performance optimization of a six-piece wide-angle lens, and in particular, the present application focuses on how to overcome problems such as the effective radius of the object side surface of the first lens is often designed to be relatively large because the first lens has negative optical power, so that the effective radius and the position of the inflection point have a relatively large impact on the MTF performance, or the assembly stability is poor because the step difference between the lens and the bearing member is too large. The specific optical power distribution of the six-piece lens and the surface type setting of each lens are not the focus of the present application, and these settings can be adjusted accordingly as needed. That is, although several specific optical power distributions and surface type settings are shown for the imaging lens group in the embodiments of the present application, it should be understood that these embodiments are only exemplary, and the imaging lens group in the present application should not be limited to the several specific cases shown in the embodiments.

[0078] The optical imaging lens according to the above embodiments of this application may employ multiple lenses, such as the six lenses described above. However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although 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.

[0079] 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.

[0080] Example 1

[0081] Figure 2 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown. Figure 2 As shown, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split type, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens, 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12.

[0082] The optical imaging lens also includes an autofocus assembly T disposed between the third lens E3 and the fourth lens E4. The optical imaging lens also includes an aperture stop STO (not shown) disposed between the third lens E3 and the fourth lens E4; more specifically, the aperture stop STO is disposed between the autofocus assembly T and the fourth lens E4.

[0083] Light from the object passes sequentially through surfaces S1 to S12 and is eventually imaged onto the imaging surface (not shown).

[0084] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance and effective focal length are millimeters (mm).

[0085] Table 1

[0086]

[0087] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the sixth lens E6 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0088]

[0089] 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. Table 2 gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S1-S12 in Example 1.

[0090] Table 2

[0091]

[0092]

[0093] like Figure 2 As shown, the optical imaging lens also includes five spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; and the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens.

[0094] Example 2

[0095] Figure 3 A schematic diagram of the optical imaging lens according to Embodiment 2 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0096] like Figure 3 As shown, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split type, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens in Embodiment 2 has the same structure as the lens group of the optical imaging lens in Embodiment 1. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 1 and 2, and will not be repeated here.

[0097] like Figure 3As shown in

[0098] Embodiment 3

[0099] Figure 4 A structure schematic diagram of the optical imaging lens according to Embodiment 3 of the present application is shown.

[0100] As Figure 4 shown, the optical imaging lens comprises a lens barrel, a lens group and a spacer element group. The lens barrel is a split lens barrel, comprising a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Embodiment 3 has the same structure as the lens group of the optical imaging lens of Embodiment 1, and the basic parameters and the high-order term coefficient table of aspheric surfaces are shown in Table 1 and Table 2, which will not be repeated here.

[0101] As Figure 4 shown, the optical imaging lens further comprises five spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The difference between this embodiment and Embodiment 1 is that the structural size of at least part of the elements in the lens barrel and the spacer element group is different.

[0102] Figure 5 (A1) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Embodiments 1 to 3, which represent the deviation of light rays of different wavelengths after passing through the lens. Figure 5 (B1) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Embodiments 1 to 3, which represent the meridional image surface curvature and sagittal image surface curvature. Figure 5 (C1) in FIG. 1 shows the distortion curves of the optical imaging lenses of Embodiments 1 to 3, which represent the distortion size values corresponding to different field angles. Figure 5 (D1) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Embodiments 1 to 3, which represent the deviation of light rays on the imaging surface after passing through the lens. According to Figure 5 It can be known that the optical imaging lenses of Embodiments 1 to 3 can achieve good imaging quality.

[0103] Embodiment 4

[0104] Figure 6 A structure schematic diagram of the optical imaging lens according to Embodiment 4 of the present application is shown. As Figure 6As shown, the optical imaging lens includes a lens barrel, lens groups, and spacer elements. The lens barrel is a split lens barrel, including a first lens barrel J1 and a second lens barrel J2. The lens groups of the optical imaging lens include, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12.

[0105] The optical imaging lens further includes an autofocus assembly T disposed between the third lens E3 and the fourth lens E4. The optical imaging lens further includes a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4, and more specifically, the stop STO is disposed between the autofocus assembly T and the fourth lens E4.

[0106] Light from an object passes through each of the surfaces S1-S12 in order and is ultimately imaged on an image plane (not shown).

[0107] Table 3 shows a table of basic parameters of the lens groups of the optical imaging lens of Example 4, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0108] Table 3

[0109]

[0110] Table 4 shows the high-order term coefficients of each aspherical surface that can be used in the optical imaging lens of Example 4, where each aspherical surface type can be defined by the formula (1) given above in Example 1.

[0111] Table 4

[0112] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 9.4877E-02 -1.0156E-01 1.9968E-01 -2.7644E-01 2.4000E-01 -1.2635E-01 3.6783E-02 -4.5470E-03 0.0000E+00 S2 1.6688E-01 -6.9278E-02 -6.4868E-01 3.6911E+00 -6.1641E+00 -1.3785E+00 1.8117E+01 -2.2146E+01 8.3694E+00 S3 -2.5190E-01 -5.2677E-01 -3.5250E-02 4.1450E+00 -1.2775E+01 3.6012E+01 -6.7757E+01 6.4469E+01 -2.3909E+01 S4 6.8701E-02 -9.5811E-01 3.9126E+00 -1.1412E+01 2.8357E+01 -3.9363E+01 2.3159E+01 -5.9242E-01 0.0000E+00 S5 9.1310E-01 -1.7618E+00 6.4509E+00 -1.9485E+01 4.7718E+01 -7.9475E+01 8.1419E+01 -3.8198E+01 0.0000E+00 S6 6.8004E-01 -1.4676E+00 4.5261E+00 -1.0992E+01 1.8192E+01 -1.6575E+01 8.3199E+00 -3.7298E+00 0.0000E+00 S7 3.4337E-01 -9.0245E-01 2.3735E+00 -2.6026E+00 1.2588E+00 -1.4303E+00 4.1020E+00 0.0000E+00 0.0000E+00 S8 3.5112E-01 -6.3548E+00 4.1415E+01 -1.5119E+02 3.4988E+02 -4.7488E+02 2.9669E+02 0.0000E+00 0.0000E+00 S9 2.5177E-01 -7.5183E+00 4.8096E+01 -2.0720E+02 6.6483E+02 -1.4860E+03 1.9844E+03 -1.1373E+03 0.0000E+00 S10 2.6909E-01 -1.5921E+00 1.1750E+00 3.1135E+01 -1.8732E+02 5.3969E+02 -8.0834E+02 5.2553E+02 0.0000E+00 S11 1.1042E+00 -2.3943E+00 6.6748E+00 -1.5745E+01 2.0830E+01 -3.6102E+00 -1.6632E+01 1.8041E+01 0.0000E+00 S12 7.9331E-01 -1.2450E+00 4.5316E+00 -1.7900E+01 4.3148E+01 -6.0494E+01 4.6090E+01 -1.4890E+01 0.0000E+00

[0113] As Figure 6As shown in the figure, the optical imaging lens further includes five spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; and the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; and the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens.

[0114] Embodiment 5

[0115] Figure 7 A structural schematic diagram of the optical imaging lens according to Embodiment 5 of the present application is shown.

[0116] As shown in the figure, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split lens barrel, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Embodiment 5 has the same structure as the lens group of the optical imaging lens of Embodiment 4, and the basic parameters and the high-order term coefficient table of aspheric surfaces are shown in Table 3 and Table 4, which will not be described again. Figure 7 As shown in the figure, the optical imaging lens further includes five spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; and the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; and the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens.

[0117] Figure 7 Embodiment 6

[0118] A structural schematic diagram of the optical imaging lens according to Embodiment 6 of the present application is shown.

[0119] Figure 8 As shown in the figure, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split lens barrel, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Embodiment 6 has the same structure as the lens group of the optical imaging lens of Embodiment 4, and the basic parameters and the high-order term coefficient table of aspheric surfaces are shown in Table 3 and Table 4, which will not be described again.

[0120] As shown in the figure, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split lens barrel, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Embodiment 6 has the same structure as the lens group of the optical imaging lens of Embodiment 4, and the basic parameters and the high-order term coefficient table of aspheric surfaces are shown in Table 3 and Table 4, which will not be described again. Figure 8 As shown in the figure, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split lens barrel, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Embodiment 6 has the same structure as the lens group of the optical imaging lens of Embodiment 4, and the basic parameters and the high-order term coefficient table of aspheric surfaces are shown in Table 3 and Table 4, which will not be described again.

[0121] Figure 8 ​​As shown, the optical imaging lens also includes five spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The difference between this embodiment and Embodiment 4 is that at least some of the elements in the lens barrel and spacer element group have different structural dimensions.

[0122] Figure 9 (A2) shows the on-axis chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 9 (B2) shows the astigmatism curves of the optical imaging lenses of Examples 4 to 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 9 (C2) shows the distortion curves of the optical imaging lenses of Examples 4 to 6, which represent the distortion magnitude values ​​corresponding to different field of view angles. Figure 9 (D2) shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which represent the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 9 It can be seen that the optical imaging lenses of Examples 4 to 6 can achieve good imaging quality.

[0123] Example 7

[0124] Figure 10 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown. Figure 10 As shown, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens barrel is a split type, including a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens, 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12.

[0125] The optical imaging lens also includes an autofocus assembly T disposed between the third lens E3 and the fourth lens E4. The optical imaging lens also includes an aperture stop STO (not shown) disposed between the third lens E3 and the fourth lens E4; more specifically, the aperture stop STO is disposed between the autofocus assembly T and the fourth lens E4.

[0126] Light from the object passes sequentially through surfaces S1 to S12 and is eventually imaged onto the imaging surface (not shown).

[0127] Table 5 shows the basic parameter table of the lens group of the optical imaging lens of Example 7, wherein the units of the radius of curvature, the thickness / distance and the effective focal length are millimeters (mm).

[0128] Table 5

[0129]

[0130] Table 6 shows the high-order term coefficient of each aspherical surface that can be used in Example 7, wherein each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0131] Table 6

[0132] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 9.4310E-01 -2.0945E+00 3.4449E+00 -3.9267E+00 3.0621E+00 -1.5942E+00 5.2902E-01 -1.0110E-01 8.4614E-03 S2 9.8315E-01 -2.4218E+00 4.9200E+00 -1.2306E+01 2.6655E+01 -3.7873E+01 3.2017E+01 -1.4580E+01 2.7485E+00 S3 5.8202E-02 -6.7447E-02 -1.4625E+00 5.2784E+00 -5.2626E+00 -3.5924E+00 1.1616E+01 -8.9110E+00 2.3564E+00 S4 3.5943E-01 -3.6691E-01 -2.5856E+00 1.5526E+01 -3.8390E+01 5.1677E+01 -3.6931E+01 1.0871E+01 0.0000E+00 S5 1.0601E+00 -4.8341E+00 1.5704E+01 -3.8128E+01 6.0520E+01 -5.5927E+01 2.6272E+01 -4.5398E+00 0.0000E+00 S6 4.2215E-01 -1.9245E+00 6.0358E+00 -1.4194E+01 2.1810E+01 -1.8228E+01 6.2016E+00 0.0000E+00 0.0000E+00 S7 5.6603E-01 -1.6852E+00 2.8229E+00 1.0051E-02 -2.8522E+01 7.1874E+01 -6.3815E+01 0.0000E+00 0.0000E+00 S8 6.0104E-02 6.7099E-01 -4.8045E+00 2.0702E+01 -7.3212E+01 1.3316E+02 -9.2068E+01 0.0000E+00 0.0000E+00 S9 -5.0732E-01 2.2827E+00 -8.1192E+00 2.2192E+01 -4.6506E+01 5.9368E+01 -3.1022E+01 0.0000E+00 0.0000E+00 S10 -3.2697E-01 6.3290E-01 -2.0311E+00 9.1081E+00 -3.0886E+01 6.7229E+01 -8.2801E+01 4.4890E+01 0.0000E+00 S11 -2.3169E-01 -4.8831E+00 1.8374E+01 -1.2194E+01 -2.2420E+02 1.1188E+03 -2.5248E+03 2.8695E+03 -1.3162E+03 S12 -7.7099E-01 3.1293E-01 1.1611E+00 -8.8744E-01 -9.8033E+00 3.4405E+01 -5.2077E+01 3.9205E+01 -1.1913E+01

[0133] As shown in Figure 10 , the optical imaging lens further includes five spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The fourth spacer element P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer element P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens.

[0134] Example 8

[0135] Figure 11 A structural schematic diagram of the optical imaging lens according to Example 8 of the present application is shown. In this embodiment, for the sake of brevity, some similar descriptions as in Example 7 will be omitted.

[0136] As shown in Figure 11 , the optical imaging lens includes a lens barrel, a lens group and a spacer element group. The lens barrel is a split lens barrel, which includes a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Example 8 has the same structure as the lens group of the optical imaging lens of Example 7, and the basic parameter table and the high-order term coefficient table of the aspherical surface are shown in Table 5 and Table 6, which will not be described again.

[0137] As shown in Figure 11 , the optical imaging lens further includes five spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The difference between this embodiment and Example 7 is that the structure size of at least part of the elements in the lens barrel and the spacer element group is different.

[0138] Embodiment 9

[0139] Figure 12 A structural schematic diagram of the optical imaging lens according to Embodiment 9 of the present application is shown.

[0140] As shown in Figure 12 , the optical imaging lens comprises a lens barrel, a lens group, and a spacer element group. The lens barrel is a split lens barrel, comprising a first lens barrel J1 and a second lens barrel J2. The lens group of the optical imaging lens of Embodiment 9 has the same structure as the lens group of the optical imaging lens of Embodiment 7, and the basic parameters and the high-order term coefficient table of aspheric surfaces are shown in Table 5 and Table 6, which will not be described again.

[0141] As shown in Figure 12 , the optical imaging lens further comprises five spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The difference between this embodiment and Embodiment 7 is that the structural size of at least part of the elements in the lens barrel and the spacer element group is different.

[0142] Figure 13 (A3) in (C3) shows the axial chromatic aberration curve of the optical imaging lenses of Embodiments 7 to 9, which represents the deviation of light rays of different wavelengths after passing through the lens. Figure 13 (B3) in (C3) shows the astigmatism curve of the optical imaging lenses of Embodiments 7 to 9, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 13 (C3) in (C3) shows the distortion curve of the optical imaging lenses of Embodiments 7 to 9, which represents the distortion size value corresponding to different field angles of view. Figure 13 (D3) in (C3) shows the magnification chromatic aberration curve of the optical imaging lenses of Embodiments 7 to 9, which represents the deviation of different image heights of light rays after passing through the lens. According to Figure 13 It can be known that the optical imaging lenses of Embodiments 7 to 9 can achieve good imaging quality.

[0143] Table 7 shows the parameter values of f, Semi-FOV, SAG52, f45, DT11, DT12, Yc11, and Yc62 of the optical imaging lenses of Embodiments 1 to 9. Among them, the unit of Semi-FOV is degree (°), and the units of other parameters are all millimeters (mm).

[0144] Table 7

[0145]

[0146] Table 8 shows the values of the parameters of at least part of the elements in the lens barrel and the spacer element group of the optical imaging lenses of Embodiments 1 to 9. Among them, part of the parameters can be calculated according to Figure 1The parameters listed in Table 8 are measured by the labeling method shown, and the units of the parameters are millimeters (mm).

[0147] Table 8

[0148]

[0149]

[0150] In summary, the optical imaging lenses of Embodiments 1 to 9 satisfy the relationships shown in Table 9.

[0151] Table 9

[0152] Conditional expression / Example 1 2 3 4 5 6 7 8 9 R1 / f 2.72 2.72 2.72 -3.41 -3.41 -3.41 -0.90 -0.90 -0.90 2 x YC11 / d1s 0.82 0.83 0.80 0.80 0.81 0.78 1.08 1.22 1.06 EP01 / CT1 3.47 3.48 3.46 3.33 3.34 3.32 2.99 3.01 2.99 (D1s-d1s) / DT12 2.41 2.41 2.41 2.69 2.69 2.70 1.89 2.08 1.89 EP34 / |SAG51|+EP34 / |SAG52| 13.95 14.05 13.90 8.01 8.21 7.84 3.48 3.63 3.54 (D4s / d4s) / (R7 / R8) -2.66 -2.69 -2.61 -3.41 -3.47 -3.32 -0.63 -0.62 -0.62 (d0m-d5m) / f5 -1.08 -1.08 -1.08 1.03 1.03 1.03 1.98 1.95 1.97 (d5s-d4s) / |SAG52| 3.90 3.90 3.90 0.30 0.30 0.30 0.81 0.81 0.81 CT4 / EP34 0.82 0.81 0.82 1.81 1.76 1.85 0.68 0.65 0.66 D1s / |SAG12| 10.61 10.54 10.72 10.48 10.39 10.61 18.19 17.99 18.30 R3 / d2s+R5 / D3s 0.14 0.14 0.15 1.09 1.12 1.08 -2.97 -2.98 -2.93 |R4 / D2m|+|R6 / D3m| 1.82 1.83 1.80 1.22 1.23 1.21 0.57 0.57 0.56 EP02 / T12 2.41 2.42 2.41 2.71 2.71 2.70 2.62 2.63 2.61 |f12| / d2s 1.41 1.43 1.37 6.04 6.18 5.99 7.54 7.56 7.43

[0153] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be a standalone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0154] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. Those skilled in the art will understand that the scope of the application described in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, technical solutions formed by mutually replacing the above-described features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens, characterized in that, Comprising: a lens barrel and a lens group and a spacer group disposed in the lens barrel, wherein the lens group comprises in order from the object side to the image side along the optical axis: a first lens with negative refractive power, whose image side surface is concave; a second lens with positive refractive power or negative refractive power, whose image side surface is convex; a third lens with positive refractive power or negative refractive power, whose image side surface is convex; a fourth lens with positive refractive power or negative refractive power, whose object side surface and image side surface are both convex or both concave; a fifth lens with positive refractive power or negative refractive power, whose image side surface is convex; and a sixth lens with negative refractive power; the spacer group comprises a first spacer, wherein the first spacer is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the number of lenses with refractive power in the optical imaging lens is six; the optical imaging lens satisfies: -3.45 < R1 / f < 2.75 and 0.75 < 2×Yc11 / d1s < 1.25; wherein R1 is the radius of curvature of the object side surface of the first lens, f is the effective focal length of the optical imaging lens, Yc11 is the distance from the inflection point farthest from the optical axis in the effective diameter of the object side surface of the first lens to the optical axis, and d1s is the maximum inner diameter of the object side surface of the first spacer in the direction perpendicular to the optical axis.

2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies: 2.95 < EP01 / CT1 < 3.50, wherein EP01 is the distance from the object side end surface of the lens barrel to the object side surface of the first spacer along the optical axis, and CT1 is the central thickness of the first lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies: 1.85 < (D1s-d1s) / DT12 < 2.75, wherein D1s is the maximum outer diameter of the object side surface of the first spacer in the direction perpendicular to the optical axis, d1s is the maximum inner diameter of the object side surface of the first spacer in the direction perpendicular to the optical axis, and DT12 is the maximum effective radius of the image side surface of the first lens.

4. The optical imaging lens according to claim 1, wherein the spacer group comprises a third spacer and a fourth spacer, wherein the third spacer is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; The optical imaging lens satisfies: 3.45 < EP34 / |SAG51| + EP34 / |SAG52| < 14.10, where EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction, SAG51 is the on-axis distance between the intersection of the object side surface of the fifth lens and the optical axis and the effective radius vertex of the object side surface of the fifth lens, and SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens.

5. The optical imaging lens according to claim 1, characterized in that, the spacer element group comprises a fourth spacer element, wherein the fourth spacer element is arranged on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the optical imaging lens satisfies: -3.5 < (D4s / d4s) / (R7 / R8) < -0.6, where D4s is the maximum outer diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis direction, d4s is the maximum inner diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis direction, R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens.

6. The optical imaging lens according to claim 1, characterized in that, the spacer element group further comprises a fifth spacer element, wherein the fifth spacer element is arranged on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the optical imaging lens satisfies: -1.10 < (d0m - d5m) / f5 < 2.00, where d0m is the maximum inner diameter of the image side end surface of the lens barrel in the direction perpendicular to the optical axis direction, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in the direction perpendicular to the optical axis direction, and f5 is the effective focal length of the fifth lens.

7. The optical imaging lens according to claim 1, characterized in that, the spacer element group further comprises a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is arranged on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is arranged on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 0.30 ≤ (d5s - d4s) / |SAG52| ≤ 3.90, where d5s is the maximum inner diameter of the object side surface of the fifth spacer element in the direction perpendicular to the optical axis direction, d4s is the maximum inner diameter of the object side surface of the fourth spacer element in the direction perpendicular to the optical axis direction, and SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens.

8. The optical imaging lens according to claim 1, characterized in that, The spacer element group further comprises a third spacer element and a fourth spacer element, wherein the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; The optical imaging lens satisfies: 0.60 < CT4 / EP34 < 1.90, wherein CT4 is the central thickness of the fourth lens on the optical axis, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the direction of the optical axis.

9. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 10.35 < D1s / |SAG12| < 18.35, wherein D1s is the maximum outer diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, and SAG12 is the on-axis distance between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens.

10. The optical imaging lens according to any one of claims 1-3, 5, 6, 7, 9, wherein, The spacer element group further comprises a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The optical imaging lens satisfies: -3.00 < R3 / d2s + R5 / D3s < 1.15, wherein R3 is the curvature radius of the object side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis, and D3s is the maximum outer diameter of the object side surface of the third spacer element in the direction perpendicular to the optical axis.

11. The optical imaging lens according to any one of claims 1-3, 5, 6, 7, 9, wherein, The spacer element group further comprises a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The optical imaging lens satisfies: 0.55 < |R4 / D2m| + |R6 / D3m| < 1.85, wherein R4 is the curvature radius of the image side surface of the second lens, R6 is the curvature radius of the image side surface of the third lens, D2m is the maximum outer diameter of the image side surface of the second spacer element in the direction perpendicular to the optical axis, and D3m is the maximum outer diameter of the image side surface of the third spacer element in the direction perpendicular to the optical axis.

12. The optical imaging lens according to any one of claims 1-9, wherein, The spacer element group further includes a second spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; The optical imaging lens satisfies: 2.40 < EP02 / T12 < 2.75, wherein EP02 is the distance from the object side end surface of the lens barrel to the object side surface of the second spacer element along the optical axis direction, and T12 is the air interval of the first lens and the second lens on the optical axis.

13. The optical imaging lens according to any one of claims 1-9, wherein: The spacer element group includes a second spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; The optical imaging lens satisfies: 1.35 < |f12| / d2s < 7.60, wherein f12 is the combined focal length of the first lens and the second lens, and d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis direction.

14. The optical imaging lens according to any one of claims 1-9, wherein: The optical imaging lens further includes an autofocus assembly disposed between the third lens and the fourth lens.

Images