CN218446164U

CN218446164U - Camera lens

Info

Publication number: CN218446164U
Application number: CN202221601605.2U
Authority: CN
Inventors: 张彬彬; 孔旭乐; 闻人建科; 豆修浔; 夏琳琳; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2023-02-03
Anticipated expiration: 2032-06-24

Abstract

The application discloses an image pickup lens, which comprises an optical lens group and a plurality of interval elements, wherein the optical lens group sequentially comprises a first lens with positive focal power, a second lens with the positive focal power, a third lens with the positive focal power, a fourth lens with the positive focal power, a fifth lens with the focal power and a sixth lens with the focal power from an object side to an image side along an optical axis; the plurality of spacing elements comprise a first spacing element and a second spacing element, and the first spacing element is positioned between the first lens and the second lens and is abutted against the image side surface of the first lens; the second spacing element is positioned between the second lens and the third lens and is abutted against the image side surface of the second lens, and the thickness of the second spacing element is larger than that of any other spacing element; and the camera lens satisfies: 16< (d 1s f 1R 1)/(d 2s CP 2T 23) <26, wherein d1s is the inner diameter of the object side surface of the first spacer element, f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object side surface of the first lens, d2s is the inner diameter of the object side surface of the second spacer element, CP2 is the thickness of the second spacer element, and T23 is the air space on the optical axis between the second lens and the third lens.

Description

Camera lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging lens.

Background

As the performance of charge-coupled devices (CCDs) and complementary metal-oxide semiconductor (CMOS) image sensors is improved and the size thereof is reduced, the corresponding imaging lenses also meet the requirements of high imaging quality and miniaturization.

An imaging lens generally includes a plurality of lenses and a spacer member for coupling adjacent lenses, and in the case of an imaging lens including five or more lenses, a problem of assembly stability due to a large step difference between the lenses occurs. With the increase of the image plane, the edge of the lens is easy to generate stray light, and the stray light and the assembly stability problem seriously affect the imaging quality of the camera lens. Therefore, how to reasonably set the optical parameters of the image pickup lens and the structures and sizes of the lens and the spacing element to improve the stray light and optimize the assembly stability of the lens is a problem to be solved in the field.

It should be appreciated that this background section is intended, in part, to provide a useful background for understanding the technology, however, such content is not necessarily what is known or understood by those skilled in the art prior to the filing date of the present application.

SUMMERY OF THE UTILITY MODEL

The present application provides an imaging lens including an optical lens group, a plurality of spacer elements, and a lens barrel for accommodating the optical lens group and the plurality of spacer elements, wherein the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having a power, wherein the first lens and the third lens have a positive power; the plurality of spacing elements comprise a first spacing element and a second spacing element, the first spacing element is positioned between the first lens and the second lens and abuts against the image side surface of the first lens, the second spacing element is positioned between the second lens and the third lens and abuts against the image side surface of the second lens, and the thickness of the second spacing element in the plurality of spacing elements is larger than that of any other spacing element; and the imaging lens satisfies: 16< (d 1s f 1R 1)/(d 2s CP 2T 23) <26, wherein d1s is an inner diameter of an object-side surface of the first spacer element, f1 is an effective focal length of the first lens, R1 is a radius of curvature of the object-side surface of the first lens, d2s is an inner diameter of an object-side surface of the second spacer element, CP2 is a thickness of the second spacer element, and T23 is an air space between the second lens and the third lens on the optical axis.

In an embodiment of the present application, the lens barrel is provided as a split type lens barrel including a front end lens barrel and a rear end lens barrel, wherein the first lens, the second lens, and the third lens are provided in the front end lens barrel, and the fourth lens, the fifth lens, and the sixth lens are provided in the rear end lens barrel.

In one embodiment of the present application, the plurality of spacer elements comprises at least one spacer element between the first spacer element and the second lens and/or at least one spacer element between the second spacer element and the third lens.

In one embodiment of the present application, the plurality of spacer elements includes at least one spacer element located between the fifth spacer element and the sixth lens.

In one embodiment of the present application, the third lens element has a convex object-side surface and a convex image-side surface; the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface; and the sixth lens has a negative power.

In one embodiment of the present application, the second lens has a negative power, and the object-side surface is convex and the image-side surface is concave; and the fifth lens has positive focal power and a convex image side surface.

In one embodiment of the present application, the imaging lens satisfies: 26< (D1 m + D1 m)/(T12 + CT 2) <35, wherein D1m is an outer diameter of an image-side surface of the first spacing element, D1m is an inner diameter of the image-side surface of the first spacing element, T12 is an air space between the first lens and the second lens on the optical axis, and CT2 is a center thickness of the second lens on the optical axis.

In one embodiment of the present application, the plurality of spacer elements includes a fifth spacer element, the fifth spacer element is located between the fifth lens element and the sixth lens element and abuts against an image side surface of the fifth lens element, wherein the imaging lens satisfies: 19< (D4 s T45)/(D5 m T56) <47, wherein D4s is an outer diameter of an object-side surface of the fourth spacing element, T45 is an air space between the fourth lens and the fifth lens on the optical axis, D5m is an inner diameter of an image-side surface of the fifth spacing element, and T56 is an air space between the fifth lens and the sixth lens on the optical axis.

In one embodiment of the present application, the imaging lens satisfies: 1< (D1 s x D0 s)/(f x CT 1) <6, wherein D1s is an outer diameter of an object-side surface of the first spacer, D0s is an inner diameter of an object-side end of the lens barrel, f is a total effective focal length of the image pickup lens, and CT1 is a center thickness of the first lens on the optical axis.

In one embodiment of the present application, the imaging lens satisfies: 8< (f 5-f 6)/(D0 m-D5 m) <20, wherein f5 is an effective focal length of the fifth lens, f6 is an effective focal length of the sixth lens, D0m is an outer diameter of an image side end of the lens barrel, and D5m is an outer diameter of an image side surface of the fifth spacing element.

In one embodiment of the present application, the plurality of spacer elements includes a fourth spacer element located between the fourth lens and the fifth lens and abutting on an image side surface of the fourth lens, wherein the imaging lens satisfies: 0< (d 4m-f 4)/(CP 4-R7) <5, wherein d4m is an inner diameter of an image-side surface of the fourth spacing element, f4 is an effective focal length of the fourth lens, CP4 is a thickness of the fourth spacing element, and R7 is a radius of curvature of an object-side surface of the fourth lens.

In one embodiment of the present application, the imaging lens satisfies: 23< (f 3+ R5-R6)/(D2 m-D2 m) <33, wherein f3 is an effective focal length of the third lens, R5 is a radius of curvature of an object-side surface of the third lens, R6 is a radius of curvature of an image-side surface of the third lens, D2m is an outer diameter of an image-side surface of the second spacer element, and D2m is an inner diameter of an image-side surface of the second spacer element.

In one embodiment of the present application, the imaging lens satisfies: 5< (R12-R10)/(D5 s-D5s + CP 5) <42,

wherein R12 is a curvature radius of an image-side surface of the sixth lens element, R10 is a curvature radius of an image-side surface of the fifth lens element, D5s is an outer diameter of an object-side surface of the fifth spacer element, D5s is an inner diameter of an object-side surface of the fifth spacer element, and CP5 is a thickness of the fifth spacer element.

In one embodiment of the present application, the imaging lens satisfies: 52< (D2 s × D4 m)/(tanFOV EP 01) <62, where D2s is an outer diameter of an object-side surface of the second spacer element, D4m is an outer diameter of an image-side surface of the fourth spacer element, FOV is a maximum angle of view of the image pickup lens, and EP01 is a distance on the optical axis between an object-side end of the lens barrel and an object-side surface of the first spacer element.

In one embodiment of the present application, the imaging lens satisfies: 5< (d 4s + L)/(EP 12+ T34) <10, wherein d4s is an object side inner diameter of the fourth spacing element, L is a dimension of the lens barrel in a direction of the optical axis, EP12 is a distance between the first spacing element and the second spacing element on the optical axis, and T34 is an air space between the third lens and the fourth lens on the optical axis.

The utility model provides a camera lens includes optical lens group and a plurality of interval component and is used for holding this optical lens group and a plurality of interval component's lens cone, the rational distribution of the focal power through the first lens that optical lens group includes, the third lens, fourth lens and sixth lens is favorable to improving camera lens's the quality of making a video recording, furthermore, through setting up a plurality of interval components, and with first interval component support locate the image side of first lens, and with second interval component support locate the image side of second lens, can reduce the static repulsion of the PC part of assemblage in-process, guarantee the stability of lens part assemblage in-process, promote the manufacturing yield of camera lens. In addition, by controlling the ratio of the inner diameter of the object side surface of the first spacing element between the first lens and the second lens, the product of the effective focal length of the first lens and the curvature radius of the object side surface of the first lens, the thickness of the second spacing element between the second lens and the third lens, and the product of the inner diameter of the object side surface of the second spacing element and the air interval of the second lens and the third lens on the optical axis, the section difference between the lenses can be reduced, so that the assembly stability of the lens is further improved, the assembly eccentricity and errors are reduced, the assembly consistency is improved, and the image pickup quality is further improved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a parameter labeling diagram of a camera lens according to the present application;

fig. 2 is a schematic sectional view showing an image pickup lens according to embodiment 1 of the present application;

fig. 3 is a schematic sectional view showing another imaging lens according to embodiment 1 of the present application;

fig. 4 is a schematic sectional view showing still another imaging lens according to embodiment 1 of the present application;

fig. 5A to 5C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an imaging lens according to embodiment 2 of the present application;

fig. 6 is a schematic sectional view showing an image pickup lens according to embodiment 2 of the present application;

fig. 7 is a schematic sectional view showing another imaging lens according to embodiment 2 of the present application;

fig. 8 is a schematic sectional view showing still another imaging lens according to embodiment 2 of the present application;

fig. 9A to 9C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an imaging lens according to embodiment 2 of the present application;

fig. 10 is a schematic sectional view showing an imaging lens according to embodiment 3 of the present application;

fig. 11 is a schematic sectional view showing another imaging lens according to embodiment 3 of the present application;

fig. 12 is a schematic sectional view showing still another imaging lens according to embodiment 3 of the present application;

fig. 13A to 13C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an imaging lens according to embodiment 3 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position 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 concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

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

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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 this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The following examples are presented to illustrate only a few embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications and improvements without departing from the concept of the present application, which all fall within the protection scope of the present invention, for example, any combination between the optical lens group, the barrel structure and the spacing element in the embodiments of the present application may be adopted, and the optical lens group in one embodiment is not limited to only be combined with the barrel structure, the spacing element and the like in this embodiment. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An image pickup lens according to an exemplary embodiment of the present application may include an optical lens group including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, each having power, a plurality of spacing elements, and a lens barrel for accommodating the optical lens group and the plurality of spacing elements.

In an exemplary embodiment, the first lens element may have a positive power, the object-side surface may be convex, and the image-side surface may be convex or concave, and the second lens element may have a negative power, the object-side surface may be convex, and the image-side surface may be concave, thereby forming a meniscus shape convex toward the object side; the third lens element can have a positive focal power, and the object side surface can be a convex surface and the image side surface can be a convex surface, thereby forming a biconvex lens element; the fourth lens element can have negative focal power, and the object-side surface of the fourth lens element can be concave and the image-side surface of the fourth lens element can be convex or concave; the fifth lens element has positive focal power, and has a concave or convex object-side surface and a convex image-side surface; the sixth lens element can have a negative power, and can have a convex or concave object-side surface and a concave image-side surface. The focal power of each lens of the camera lens is reasonably distributed, so that the camera lens can meet the requirement of long focus; the optical path of the optical path in the optical system can be adjusted by reasonably distributing the surface type of each lens, the manufacturability of lens forming is increased, the resolving power of the camera lens is effectively improved, and the camera effect can be effectively improved by reasonably distributing the focal power and the surface type.

More specifically, the third lens element is controlled to have positive focal power, the object-side surface is convex, and the image-side surface is convex; the fourth lens is controlled to have negative focal power, the object side surface of the fourth lens is a concave surface so as to control the sixth lens to have negative focal power, and the reduction of the inclination angle of incident light is facilitated, so that the large field of view of the object space is effectively shared, and a larger field angle range is obtained.

It is further clear that by controlling the second lens to have negative focal power, the object-side surface is convex and the image-side surface is concave; and controlling the fifth lens to have positive focal power, wherein the imaging requirement of the lens can be ensured by the convex surface at the image side of the fifth lens, the light transmission quantity of the lens can be ensured by the positive focal power of the fifth lens, the light can be ensured to be converged and imaged by the negative focal power of the second lens through adjusting the direction of the light, and the imaging quality of the lens can be improved through the matching of the opposite focal powers of the second lens and the fifth lens.

In an exemplary embodiment, the plurality of spacer elements includes, for example, a first spacer element between the first lens and the second lens and a second spacer element between the second lens and the third lens. Alternatively, the first spacer element may abut against an image side surface of an adjacent lens (e.g., the first lens), and more specifically, the first spacer element may contact a non-effective optical portion of the image side surface of the first lens (e.g., an edge region of the first lens). Alternatively, the second spacer element may abut against an image side surface of an adjacent lens (e.g., the second lens), and more specifically, the second spacer element may contact an inactive optical portion of the image side surface of the second lens (e.g., an edge region of the second lens). Through rationally setting up between first lens and second lens and leaning on the first spacer element of establishing with the image side of first lens and rationally setting up between second lens and third lens and leaning on the second spacer element of establishing with the image side of second lens, can reduce the static of the PC part of assemblage in-process and repel, guarantee the stability of lens part assemblage in-process, promote the manufacturing yield of camera lens.

In an exemplary embodiment, the plurality of spacer elements further comprises, for example, at least one spacer element between the first spacer element and the second lens and/or at least one spacer element between the second spacer element and the third lens. By providing at least three spacer elements between the first lens and the third lens, the distribution of optical power can be constrained, the upper performance limit of the optical system is improved, and the wall thickness of each spacer element can be controlled; meanwhile, the forming difficulty of the lens group can be reduced, and the assembling stability is facilitated.

In an exemplary embodiment, the plurality of spacer elements further includes, for example, a fourth spacer element between the fourth lens and the fifth lens and a fifth spacer element between the fifth lens and the sixth lens. Alternatively, the fourth spacer element may abut against an image side surface of an adjacent lens (e.g., the fourth lens), and more specifically, the fourth spacer element may contact an inactive optical portion of the image side surface of the fourth lens (e.g., an edge region of the fourth lens). Alternatively, the fifth spacer element may abut against an image side surface of an adjacent lens (e.g., the fifth lens), and more specifically, the fifth spacer element may contact an inactive optical portion of the image side surface of the fifth lens (e.g., an edge region of the fifth lens). Through rationally setting up between fourth lens and fifth lens and leaning on the fourth spacer element of establishing with the image side of fourth lens and rationally setting up between fifth lens and sixth lens and leaning on the fifth spacer element of establishing with the image side of fifth lens, can reduce the static of the PC part of assemblage in-process and repel, guarantee the stability of lens part assemblage in-process, promote the manufacturing yield of camera lens.

Through setting up above-mentioned a plurality of spacer elements, help intercepting unnecessary reflection light path, promote camera lens's formation of image definition, reduce the production of parasitic light, ghost to can guarantee that a plurality of spacer elements assemble with lens cone, lens in order, and guarantee that the assembly is stable.

In an exemplary embodiment, a second spacer element of the plurality of spacer elements has a thickness greater than a thickness of any remaining spacer elements. The second spacing element is controlled to have thicker thickness, so that the stability of the lens component in the assembling process can be ensured, and the manufacturing yield of the lens is improved.

In an exemplary embodiment, the plurality of spacer elements further comprises, for example, at least one spacer element located between the fifth spacer element and the sixth lens. Through set up at least three spacer element between fourth lens and sixth lens, can reduce lens and leave the type degree of difficulty, improve the equipment precision, also help reducing stray light's production to the accessible shortens the system overall length and realizes that the module is miniaturized.

In an exemplary embodiment, the lens barrel arrangement may be provided as a split type lens barrel including a front end lens barrel and a rear end lens barrel, wherein the first lens, the second lens, and the third lens are provided at the front end lens barrel, and the fourth lens, the fifth lens, and the sixth lens are provided at the rear end lens barrel. By respectively assembling the two split lens cones, the assembly difficulty of a single lens can be reduced, the concentration of integral assembly is improved, and the problem of poor eccentricity is solved; in addition, in the process of assembling the lens, the assembling freedom degree is larger and the selectable assembling angles are more, so that the better assembling angles can be screened conveniently.

In an exemplary embodiment, the image pickup lens further includes a prism disposed in the lens barrel, and the prism may be disposed on an object side of the first lens along the optical axis. The prism may have two optical axes that are orthogonal, an incident optical axis that is perpendicular to the incident surface of the prism and an exit optical axis that is perpendicular to the exit surface of the prism. The light from the object can sequentially pass through the incident surface of the prism along the incident optical axis, is reflected and deflected by 90 degrees by the reflecting surface of the prism, and then is emitted in the direction vertical to the emitting surface. The emergent optical axis of the prism and the optical axis of the optical lens group are positioned on the same straight line, and light emitted through the emergent surface of the prism can sequentially pass through the second lens, the third lens, the fourth lens and the fifth lens and is finally projected onto an imaging surface. The optical axes are fused together to form the main optical axis of the periscopic telephoto lens. The reflection direction of light rays is changed through the prism, so that the telephoto lens can be laid horizontally (placed backwards relative to vertical placement), a periscopic structure can be realized, and the thickness of a device carrying the telephoto lens is reduced.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 16< (d 1s f 1R 1)/(d 2s CP 2T 23) <26, where d1s is an inner diameter of an object-side surface of the first spacer element, f1 is an effective focal length of the first lens E1, R1 is a radius of curvature of the object-side surface of the first lens E1, d2s is an inner diameter of an object-side surface of the second spacer element P2, CP2 is a thickness of the second spacer element P2, and T23 is an air space on an optical axis between the second lens E2 and the third lens E3. Further, the imaging lens satisfies: 19< (d 1s f 1R 1)/(d 2s CP 2T 23) <24. By controlling the above conditions, the segment difference between the lenses can be reduced, the assembly stability of the lens is improved, the assembly eccentricity and errors are reduced, the assembly consistency is improved, and the shooting quality is further improved.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 26< (D1 m + D1 m)/(T12 + CT 2) <35, where D1m is an outer diameter of an image-side surface of the first spacing element P1, D1m is an inner diameter of the image-side surface of the first spacing element P1, T12 is an air interval between the first lens E1 and the second lens E2 on the optical axis, and CT2 is a central thickness of the second lens E2 on the optical axis. Further, the imaging lens satisfies: 29< (D1 m + D1 m)/(T12 + CT 2) <33. By controlling the above conditions, it is possible to ensure that the incident light has a tendency to shrink after passing through the first lens E1, the second lens E2, and the third lens E3, and is uniformly incident to the subsequent lenses (e.g., the fourth lens E4, the fifth lens E5, and the sixth lens E6). In addition, the smaller air interval is formed on the optical axes of the first lens E1 and the second lens E2, and a first spacing element is further arranged between the first lens E1 and the second lens E2 to block redundant light paths, so that the stray light is reduced, and the overall imaging quality is improved.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 19< (D4 s T45)/(D5 m T56) <47, wherein D4s is an outer diameter of an object side surface of the fourth spacing element P4, T45 is an air space between the fourth lens E4 and the fifth lens E5 on an optical axis, D5m is an inner diameter of an image side surface of the fifth spacing element P5, and T56 is an air space between the fifth lens E5 and the sixth lens E6 on the optical axis. By controlling the above conditions, the total length of the lens can be controlled, and meanwhile, the intervals between the surfaces of the lens can be reasonably controlled, so that the overlarge light angle and the processing difficulty of the lens are avoided.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 1< (D1 s × D0 s)/(f × CT 1) <6, where D1s is an outer diameter of an object-side surface of the first spacer element P1, D0s is an inner diameter of an object-side end of a lens barrel (e.g., a front end lens barrel P0-1), f is a total effective focal length of the image pickup lens, and CT1 is a center thickness of the first lens E1 on an optical axis. Further, the imaging lens satisfies: 2< (D1 s D0 s)/(f CT 1) <5. By controlling the conditions, the problem of low yield caused by the matching amount is favorably improved, the reasonable distribution of focal power is favorably realized, and the imaging quality of an optical system is improved; in addition, the difficulty of the lens forming process can be reduced, the release is better, and the white object scheme can be reduced.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 8< (f 5-f 6)/(D0 m-D5 m) <20, where f5 is an effective focal length of the fifth lens E5, f6 is an effective focal length of the sixth lens E6, D0m is an outer diameter of an image-side end of a lens barrel (e.g., the rear end barrel P0-2), and D5m is an outer diameter of an image-side face of the fifth spacing element P4. By controlling the above conditions, it is helpful to control the thickness of the fifth lens, and to control the air gap between the fifth lens and the sixth lens; the larger the interval is, the easier the interval element is to select, and the larger the stray light improving space is, which is beneficial to improving the quality of the stray light of the whole lens.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 0< (d 4m-f 4)/(CP 4-R7) <5, where d4m is the inner diameter of the image-side surface of the fourth spacer element P4, f4 is the effective focal length of the fourth lens E4, CP4 is the thickness of the fourth spacer element P4, and R7 is the radius of curvature of the object-side surface of the fourth lens E4. Further, the imaging lens satisfies: 1< (d 4m-f 4)/(CP 4-R7) <4. Through controlling above-mentioned condition, can guarantee that light presents the trend of diverging when passing through fourth lens, fifth lens and sixth lens, guarantee the rationality of light trend, control fourth spacing element P4 simultaneously and be close to the internal diameter of like the side end, effectively shelter from stray light, promote the imaging quality.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 23< (f 3+ R5-R6)/(D2 m-D2 m) <33, where f3 is an effective focal length of the third lens E3, R5 is a radius of curvature of an object-side surface of the third lens E3, R6 is a radius of curvature of an image-side surface of the third lens E3, D2m is an outer diameter of an image-side surface of the second spacer element P2, and D2m is an inner diameter of an image-side surface of the second spacer element P2. Further, the imaging lens satisfies: 25< (f 3+ R5-R6)/(D2 m-D2 m) <30. By controlling the above conditions, a suitable stop position can be selected by controlling the central thickness of the third lens E3 on the optical axis, so that the focal power of the third lens can be effectively ensured to be positive, and the aberrations (coma, astigmatism, distortion and axial chromatic aberration) related to the stop of the optical system can be effectively corrected.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 5< (R12-R10)/(D5 s-D5s + CP 5) <42, wherein R12 is a radius of curvature of an image-side surface of the sixth lens E6, R10 is a radius of curvature of an image-side surface of the fifth lens E5, D5s is an outer diameter of an object-side surface of the fifth spacing element P5, D5s is an inner diameter of an object-side surface of the fifth spacing element P5, and CP5 is a thickness of the fifth spacing element P5. Further, the imaging lens satisfies: 5< (R12-R10)/(D5 s-D5s + CP 5) <42. By controlling the above conditions, the upper limit of the performance of the optical system can be improved, and the wall thickness of the fifth spacing element can be ensured, so that the uniformity and the overall structural strength of the fifth spacing element are improved, and meanwhile, the size of the fifth spacing element is favorably controlled, and the imaging quality is improved.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 52< (D2 s × D4 m)/(tanFOV EP 01) <62, where D2s is the outer diameter of the object-side surface of the second spacer P2, D4m is the outer diameter of the image-side surface of the fourth spacer P4, FOV is the maximum field angle of the image-taking lens, and EP01 is the distance on the optical axis between the object-side end of the lens barrel and the object-side surface of the first spacer P1. By controlling the above conditions, the maximum field angle of the lens can be effectively increased, so that light can be incident better, a sufficient light source can be obtained, the imaging quality of the lens is further improved, and the image quality is clearer.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens satisfies: 5< (d 4s + L)/(EP 12+ T34) <10, wherein d4s is the inner diameter of the object side surface of the fourth spacing element P4, L is the dimension of the lens barrel in the optical axis direction, EP12 is the distance between the first spacing element P1 and the second spacing element P2 on the optical axis, and T34 is the air space between the third lens E3 and the fourth lens E4 on the optical axis. By controlling the above conditions, the total length of the lens barrel can be reduced, the system is more stable, and the reliability and stability of the whole lens are improved; meanwhile, the size of the spacing element is controlled, stray light is blocked, and imaging quality is improved.

In an exemplary embodiment, a material of any one of the first to sixth lenses is selected from at least one of plastic and glass. Through the material of reasonable setting lens, be favorable to under the prerequisite of the control cost and the processing degree of difficulty, guarantee imaging quality.

In an exemplary embodiment, the optical lens group according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface.

The optical lens group according to the above-described embodiment of the present application may employ a multi-piece lens, such as the above six-piece lens. By reasonably distributing the focal power, the surface type, the center thickness of each lens, the on-axis distance between each lens and the like, the low-order aberration of the camera lens can be effectively balanced and controlled, meanwhile, the tolerance sensitivity can be reduced, and the miniaturization of the camera lens can be kept.

In the embodiment of the present application, at least one of the mirror surfaces of each of the first to sixth lenses is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously 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, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, the object-side surface and the image-side surface of each of the first lens to the sixth lens are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an imaging lens may be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the imaging lens is not limited to including six lenses. The camera lens may also include other numbers of lenses, if desired.

Specific examples of an imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 2 to 5C. Fig. 2 to 4 respectively show schematic sectional views of three types of imaging lenses according to embodiment 1 of the present application.

The imaging lens system shown in fig. 2 to 5 includes, in order from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. Alternatively, the imaging lens may further include an optical filter and an imaging surface S15.

The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive refractive power, the object-side surface S9 is concave, the image-side surface S10 is convex, the sixth lens element E6 has negative refractive power, the object-side surface S11 is concave, and the image-side surface S12 is concave. The filter has an object side surface S13 and an image side surface S14. The light from the subject passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

Table 1 shows a basic parameter table of the imaging lens of embodiment 1, in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm).

TABLE 1

In the present embodiment, the total effective focal length f of the imaging lens is 10.10mm, the distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S15 on the optical axis is 9.84mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 is 3.52mm, and the maximum field angle FOV of the imaging lens is 38.7 °.

In the present embodiment, the face shape x of the aspheric surfaces included in the object-side surface and the image-side surface of the lenses of the first lens E1 to the sixth lens E6 can be defined using, but not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for each of the aspherical mirrors S1 to S12 in example 1.

TABLE 2

As shown in fig. 2, the image pickup lens 110 may further include a plurality of spacer members and a lens barrel for accommodating the above-described optical lens group and the plurality of spacer members. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements include, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

As shown in fig. 3, the image pickup lens 120 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

As shown in fig. 4, the image pickup lens 130 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens cone can be arranged as a split type lens cone which comprises a front lens cone P0-1 and a rear lens cone P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

In some examples of the imaging lens system shown in fig. 2 to 4, the first spacer element P1 may abut against an image-side surface of the first lens element E1, the second spacer element P2 may abut against an image-side surface of the second lens element E2, the fourth spacer element P4 may abut against an image-side surface of the fourth lens element E4, and the fifth spacer element P5 may abut against an image-side surface of the fifth lens element E5.

In some examples of the imaging lens shown in fig. 2 to 4, the plurality of spacer elements further include, for example, one spacer element P1 'between the first spacer element P1 and the second lens E2 and/or one spacer element P2' between the second spacer element P2 and the third lens E3, so that at least three spacer elements are provided between the first lens E1 and the third lens E3, the above arrangement can secure the wall thickness of the at least three spacer elements and reduce the difficulty of lens group formation, which is advantageous for assembly stability.

In some examples of the imaging lens shown in fig. 2 to 4, the plurality of spacer elements further include, for example, one spacer element P5' between the fifth spacer element P5 and the sixth lens E6, so that three spacer elements are provided between the first lens E1 and the third lens E3, which can ensure the wall thicknesses of the three spacer elements, improve the assembly accuracy, and reduce the generation of stray light, while facilitating shortening of the total length of the system to achieve module miniaturization.

In the present embodiment, the first spacing element P1, one spacing element P2' between the second spacing element P2 and the third lens E3, the fourth spacing element P4, and one spacing element P5' between the fifth spacing element P5 and the sixth lens E6 are spacers, and the one spacing element P1' between the first spacing element P1 and the second lens E2, the second spacing element P2, and the fifth spacing element P5 are spacers. The plurality of spacing elements can prevent external redundant light from entering, so that the lens and the lens barrel are better supported, and the structural stability of the camera lens is enhanced.

Fig. 5A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging lens. Fig. 5B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 5C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 5A to 5C, the imaging lens according to embodiment 1 can achieve good imaging quality.

Example 2

An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 6 to 9C. Fig. 6 to 8 respectively show schematic sectional views of three types of imaging lenses according to embodiment 2 of the present application.

The imaging lens system shown in fig. 6 to 8 includes, in order from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. Alternatively, the imaging lens may further include an optical filter and an imaging surface S15.

The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, the object-side surface S9 is concave, the image-side surface S10 is convex, the sixth lens element E6 has negative power, the object-side surface S11 is convex, and the image-side surface S12 is concave. The filter has an object side surface S13 and an image side surface S14. The light from the subject sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 3 shows a basic parameter table of the imaging lens of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm).

TABLE 3

In the present embodiment, the total effective focal length f of the imaging lens is 10.09mm, the distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S15 on the optical axis is 9.84mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 is 3.55mm, and the maximum field angle FOV of the imaging lens is 39.0 °.

Table 4 shows the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for each of the mirror surfaces in the aspherical surfaces S1 to S12 in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 4

As shown in fig. 6, the image pickup lens 210 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

As shown in fig. 7, the image pickup lens 220 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

As shown in fig. 8, the image pickup lens 230 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

In some examples of the imaging lens system shown in fig. 6 to 8, the first spacer element P1 may abut against an image-side surface of the first lens element E1, the second spacer element P2 may abut against an image-side surface of the second lens element E2, the fourth spacer element P4 may abut against an image-side surface of the fourth lens element E4, and the fifth spacer element P5 may abut against an image-side surface of the fifth lens element E5.

In some examples of the imaging lens shown in fig. 6 to 8, the plurality of spacer elements further include, for example, one spacer element P1 'between the first spacer element P1 and the second lens E2 and/or one spacer element P2' between the second spacer element P2 and the third lens E3, so that at least three spacer elements are provided between the first lens E1 and the third lens E3, which can ensure the wall thickness of the at least three spacer elements and reduce the difficulty of lens group formation, contributing to the assembly stability.

In some examples of the imaging lens shown in fig. 6 to 8, the plurality of spacer elements further include, for example, one spacer element P5' between the fifth spacer element P5 and the sixth lens E6, so that three spacer elements are provided between the first lens E1 and the third lens E3, which can ensure the wall thicknesses of the three spacer elements, improve the assembly accuracy, and reduce the generation of stray light, while facilitating shortening of the total length of the system to achieve module miniaturization.

In the present embodiment, the first spacing element P1, the one spacing element P2' between the second spacing element P2 and the third lens E3, the fourth spacing element P4, and the one spacing element P5' between the fifth spacing element P5 and the sixth lens E6 are spacers, and the one spacing element P1', the second spacing element P2, and the fifth spacing element P5 between the first spacing element P1 and the second lens E2 are spacers. The plurality of spacing elements can prevent external redundant light from entering, so that the lens and the lens barrel are better supported, and the structural stability of the camera lens is enhanced.

Fig. 9A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 9B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. Fig. 9C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 9A to 9C, the imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 10 to 13C. Fig. 10 to 12 respectively show schematic sectional views of three types of imaging lenses according to embodiment 3 of the present application.

The imaging lens system shown in fig. 10 to 12 includes, in order from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. Alternatively, the imaging lens may further include an optical filter and an imaging surface S15.

The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10, and the sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The filter has an object side surface S13 and an image side surface S14. The light from the subject sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 5 shows a basic parameter table of the imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 5

In the present embodiment, the total effective focal length f of the imaging lens is 10.10mm, the distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S15 on the optical axis is 9.84mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 is 3.55mm, and the maximum field angle FOV of the imaging lens is 38.6 °.

Table 6 shows the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for each of the mirror surfaces in the aspherical surfaces S1 to S12 in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

9.5501E-05

-1.7740E-03

3.6851E-03

-4.9662E-03

4.3269E-03

-2.5569E-03

1.0544E-03

S2

-2.8409E-03

1.5149E-02

-1.7061E-02

1.3903E-02

-8.6213E-03

3.9781E-03

-1.3345E-03

S3

-3.3794E-02

2.3400E-02

-1.4555E-02

1.0744E-02

-8.5824E-03

5.4646E-03

-2.4547E-03

S4

-4.1251E-02

1.4994E-02

-3.5308E-03

3.4744E-03

-6.1753E-03

5.6717E-03

-3.0017E-03

S5

4.1179E-03

-3.4543E-03

2.1057E-02

-5.8237E-02

1.0184E-01

-1.1587E-01

8.8671E-02

S6

7.8536E-03

-7.6078E-04

7.9016E-03

-1.1295E-02

1.1774E-02

-7.7567E-03

3.2445E-03

S7

2.7468E-02

9.6121E-02

-2.4227E-01

3.0010E-01

-1.3850E-01

-1.8628E-01

4.1957E-01

S8

1.2899E-01

1.4498E-01

-1.4899E+00

6.5450E+00

-1.8879E+01

3.7711E+01

-5.3216E+01

S9

2.6502E-04

8.2810E-04

-8.3059E-03

7.0525E-03

8.2117E-04

-7.3641E-03

7.8686E-03

S10

-9.4076E-02

1.6406E-01

-1.8106E-01

1.4786E-01

-1.2875E-01

1.2015E-01

-9.0036E-02

S11

-2.1313E-01

2.3905E-01

-1.2927E-01

-7.3614E-02

1.8705E-01

-1.5747E-01

7.8297E-02

S12

-1.1246E-01

1.0346E-01

-8.9151E-02

6.1022E-02

-3.1659E-02

1.2306E-02

-3.5751E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.0746E-04

6.3232E-05

-8.9809E-06

8.3879E-07

-4.6357E-08

1.1484E-09

0.0000E+00

S2

3.1863E-04

-5.2583E-05

5.6916E-06

-3.6328E-07

1.0360E-08

0.0000E+00

S3

7.5817E-04

-1.5810E-04

2.1327E-05

-1.6850E-06

5.9360E-08

0.0000E+00

S4

9.7807E-04

-1.9462E-04

2.1721E-05

-1.0430E-06

0.0000E+00

S5

-4.6019E-02

1.5989E-02

-3.5632E-03

4.6071E-04

-2.6283E-05

0.0000E+00

S6

-7.7412E-04

8.0988E-05

0.0000E+00

S7

-3.9928E-01

2.2572E-01

-7.8051E-02

1.5296E-02

-1.3050E-03

0.0000E+00

S8

5.3384E+01

-3.7811E+01

1.8471E+01

-5.9191E+00

1.1194E+00

-9.4658E-02

0.0000E+00

S9

-4.7145E-03

1.8187E-03

-4.6110E-04

7.4350E-05

-6.9105E-06

2.8140E-07

0.0000E+00

S10

4.7657E-02

-1.7463E-02

4.4139E-03

-7.5706E-04

8.4274E-05

-5.4983E-06

1.5966E-07

S11

-2.5568E-02

5.6448E-03

-8.3679E-04

7.9905E-05

-4.4423E-06

1.0919E-07

0.0000E+00

S12

7.7145E-04

-1.2171E-04

1.3612E-05

-1.0198E-06

4.5796E-08

-9.2976E-10

0.0000E+00

TABLE 6

As shown in fig. 10, the image pickup lens 310 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

As shown in fig. 11, the image pickup lens 320 may further include a plurality of spacing elements and a lens barrel for accommodating the above-described optical lens group and the plurality of spacing elements. The lens barrel can be arranged as a split type lens barrel, and the split type lens barrel comprises a front end lens barrel P0-1 and a rear end lens barrel P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

As shown in fig. 12, the image pickup lens 330 may further include a plurality of spacer members and a lens barrel for accommodating the above-described optical lens group and the plurality of spacer members. The lens cone can be arranged as a split type lens cone which comprises a front lens cone P0-1 and a rear lens cone P0-2. The plurality of spacer elements includes, for example, a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, and a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6.

In some examples of the imaging lens system shown in fig. 10 to 12, the first spacer element P1 may abut against an image-side surface of the first lens element E1, the second spacer element P2 may abut against an image-side surface of the second lens element E2, the fourth spacer element P4 may abut against an image-side surface of the fourth lens element E4, and the fifth spacer element P5 may abut against an image-side surface of the fifth lens element E5.

In some examples of the imaging lens shown in fig. 10 to 12, the plurality of spacer elements further include, for example, one spacer element P1 'between the first spacer element P1 and the second lens E2 and/or one spacer element P2' between the second spacer element P2 and the third lens E3, so that at least three spacer elements are provided between the first lens E1 and the third lens E3, which can ensure the wall thickness of the at least three spacer elements and reduce the difficulty of lens group formation, contributing to the assembly stability.

In some examples of the imaging lens shown in fig. 10 to 12, the plurality of spacer elements further include, for example, one spacer element P5' between the fifth spacer element P5 and the sixth lens E6, so that three spacer elements are provided between the first lens E1 and the third lens E3, which can secure the wall thicknesses of the three spacer elements, improve the assembly accuracy, and reduce the generation of stray light, while contributing to shortening the overall length of the system and achieving module miniaturization.

Fig. 13A shows on-axis chromatic aberration curves of the imaging lens of embodiment 3, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 13B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. Fig. 13C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 13A to 13C, the imaging lens according to embodiment 3 can achieve good imaging quality.

Table 7 shows basic parameter tables of lens barrels and spacer elements of three kinds of imaging lenses of embodiments 1 to 3, in which the unit of each parameter in table 7 is millimeter (mm).

TABLE 7

In conclusion, examples 1 to 3 each satisfy the relationship shown in table 8.

TABLE 8

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An imaging lens including an optical lens group, a plurality of spacer elements, and a lens barrel for accommodating the optical lens group and the plurality of spacer elements, wherein the optical lens group includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having power,

the first lens and the third lens have positive optical power; the plurality of spacing elements comprise a first spacing element and a second spacing element, and the first spacing element is positioned between the first lens and the second lens and is abutted against the image side surface of the first lens; the second spacing element is positioned between the second lens and the third lens and abuts against the image side surface of the second lens, wherein the thickness of the second spacing element in the plurality of spacing elements is larger than that of any other spacing element; and the imaging lens satisfies:

16<(d1s*f1*R1)/(d2s*CP2*T23)<26，

wherein d1s is an inner diameter of an object-side surface of the first spacer element, f1 is an effective focal length of the first lens, R1 is a radius of curvature of the object-side surface of the first lens, d2s is an inner diameter of an object-side surface of the second spacer element, CP2 is a thickness of the second spacer element, and T23 is an air space between the second lens and the third lens on the optical axis.

2. The imaging lens according to claim 1, wherein the lens barrel is provided as a divided body barrel including a front end lens barrel and a rear end lens barrel, wherein the first lens, the second lens, and the third lens are provided to the front end lens barrel, and the fourth lens, the fifth lens, and the sixth lens are provided to the rear end lens barrel.

3. The imaging lens of claim 1, wherein the plurality of spacer elements further includes at least one spacer element between the first spacer element and the second lens and/or at least one spacer element between the second spacer element and the third lens.

4. The imaging lens of claim 1, wherein the plurality of spacer elements further includes a fifth spacer element positioned between the fifth lens and the sixth lens and abutting an image side surface of the fifth lens, the plurality of spacer elements further including at least one spacer element positioned between the fifth spacer element and the sixth lens.

5. The imaging lens according to claim 1,

the object side surface of the third lens is convex, and the image side surface of the third lens is convex;

the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface; and

the sixth lens has a negative power.

6. The imaging lens according to claim 1,

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; and

the fifth lens has positive focal power and a convex surface on the image side.

7. The imaging lens according to any one of claims 1 to 6, characterized in that the imaging lens satisfies:

26<(D1m+d1m)/(T12+CT2)<35，

wherein D1m is an outer diameter of an image-side surface of the first spacer element, D1m is an inner diameter of the image-side surface of the first spacer element, T12 is an air space between the first lens and the second lens on the optical axis, and CT2 is a central thickness of the second lens on the optical axis.

8. An imaging lens according to any one of claims 1 to 3, wherein the plurality of spacer elements further include a fourth spacer element and a fifth spacer element, the fourth spacer element being located between the fourth lens and the fifth lens and abutting on an image side surface of the fourth lens, the fifth spacer element being located between the fifth lens and the sixth lens and abutting on an image side surface of the fifth lens, wherein the imaging lens satisfies:

19<(D4s*T45)/(d5m*T56)<47，

wherein D4s is an outer diameter of an object-side surface of the fourth spacer element, T45 is an air space between the fourth lens element and the fifth lens element on the optical axis, D5m is an inner diameter of an image-side surface of the fifth spacer element, and T56 is an air space between the fifth lens element and the sixth lens element on the optical axis.

9. The imaging lens according to any one of claims 1 to 6, characterized in that the imaging lens satisfies:

1<(D1s*d0s)/(f*CT1)<6，

wherein D1s is an outer diameter of an object-side surface of the first spacer element, D0s is an inner diameter of an object-side end of the lens barrel, f is a total effective focal length of the imaging lens, and CT1 is a center thickness of the first lens on the optical axis.

10. The imaging lens according to claim 8, characterized in that the imaging lens satisfies:

8<(f5-f6)/(D0m-D5m)<20，

wherein f5 is an effective focal length of the fifth lens, f6 is an effective focal length of the sixth lens, D0m is an outer diameter of an image side end of the lens barrel, and D5m is an outer diameter of an image side surface of the fifth spacer.

11. An imaging lens according to any one of claims 1 to 3, wherein the plurality of spacer elements further includes a fourth spacer element that is located between the fourth lens and the fifth lens and abuts on an image side surface of the fourth lens, wherein the imaging lens satisfies:

0<(d4m-f4)/(CP4-R7)<5，

wherein d4m is an inner diameter of an image-side surface of the fourth spacer element, f4 is an effective focal length of the fourth lens element, CP4 is a thickness of the fourth spacer element, and R7 is a radius of curvature of an object-side surface of the fourth lens element.

12. The imaging lens according to any one of claims 1 to 6, characterized in that the imaging lens satisfies:

23<(f3+R5-R6)/(D2m-d2m)<33，

wherein f3 is an effective focal length of the third lens element, R5 is a radius of curvature of an object-side surface of the third lens element, R6 is a radius of curvature of an image-side surface of the third lens element, D2m is an outer diameter of an image-side surface of the second spacer element, and D2m is an inner diameter of an image-side surface of the second spacer element.

13. The imaging lens according to claim 8, characterized in that the imaging lens satisfies:

5<(R12-R10)/(D5s-d5s+CP5)<42，

14. The imaging lens according to claim 11, characterized in that the imaging lens satisfies:

52<(D2s*D4m)/(tanFOV*EP01)<62，

wherein D2s is an outer diameter of an object-side surface of the second spacer, D4m is an outer diameter of an image-side surface of the fourth spacer, FOV is a maximum field angle of the imaging lens, and EP01 is a distance between an object-side end of the lens barrel and an object-side surface of the first spacer on the optical axis.

15. The imaging lens according to claim 8, characterized in that the imaging lens satisfies:

5<(d4s+L)/(EP12+T34)<10，

wherein d4s is an inner diameter of an object-side surface of the fourth spacing element, L is a dimension of the lens barrel in a direction along the optical axis, EP12 is a distance between the first spacing element and the second spacing element on the optical axis, and T34 is an air space between the third lens and the fourth lens on the optical axis.