CN113671673A

CN113671673A - Optical imaging lens

Info

Publication number: CN113671673A
Application number: CN202111098551.2A
Authority: CN
Inventors: 周进; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2021-11-19

Abstract

The invention discloses an optical imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having a positive optical power; the second lens with 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; a third lens having a refractive power, an object side surface of which is concave; and a fourth lens having a focal power; the distance TTL from the object side surface of the first lens element of the optical imaging lens to the imaging surface on the optical axis and the effective focal length f of the optical imaging lens meet the following requirements: TTL/f < 1.1; the distance BFL from the image side surface of the last lens to the imaging surface on the optical axis meets the following requirements: 5.0mm < BFL <12.0 mm. This conditional constraint can make the system obtain longer focus under the prerequisite of guaranteeing the miniaturization, helps promoting the ability that the camera lens highlights the main part and shoots the scenery far away. The distance from the image side surface of the last lens to the imaging surface on the optical axis is restricted, so that the lens has a larger telescopic length, and the ultrathin electronic equipment is more adaptive to the long focal length.

Description

Optical imaging lens

Technical Field

The invention belongs to the field of optical imaging, and particularly relates to an optical imaging lens comprising four lenses.

Background

With the rapid development of science and technology, portable electronic devices such as mobile phones and tablet computers are rapidly popularized among people; professional photographic equipment such as a single lens reflex and a digital camera are expensive and difficult to carry, and diversified use scenes and requirements of people are difficult to meet; therefore, it is becoming a trend to integrate high-quality camera systems into electronic products such as mobile phones and tablet computers. In order to improve competitiveness, smart phone manufacturers put forward more and higher demands on mobile phone lenses, and particularly on high-end and flagship models, multiple lenses such as large image planes, large wide angles and long focuses are often selected for cooperation. The telephoto lens has a longer focal length and a smaller viewing angle, and can highlight a shot main body in a smaller picture; the distortion is small, the original outline proportion of the shooting main body can be well restored, and the distortion is reduced; the depth of field is small, and the depth sense of distant scenes and nearby scenes can be reduced. However, the telephoto lens generally has a long length, and in order to ensure portability and beauty, smart phones have a trend of ultra-thin development, and based on the above background, the invention provides a four-piece telephoto lens with a novel structure, on the premise of satisfying a long focal length, a large telescopic length of the lens is reserved, the lens is extended during photographing, and the lens is retracted when the smart phone is not used for photographing in daily life, so that the problem of incompatibility of the ultra-thin mobile phone with the telephoto lens is well solved.

Disclosure of Invention

The application aims at providing an optical imaging lens formed by four lenses, and the optical imaging lens has the characteristics of large lens telescopic length and the like.

The present application provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising:

a first lens having a positive optical power;

the second lens with 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;

a third lens having a refractive power, an object side surface of which is concave; and

a fourth lens having an optical power;

the distance TTL from the object side surface of the first lens element of the optical imaging lens to the imaging surface on the optical axis and the effective focal length f of the optical imaging lens meet the following requirements: TTL/f < 1.1;

the distance BFL from the image side surface of the last lens to the imaging surface on the optical axis meets the following requirements: 5.0mm < BFL <12.0 mm.

According to one embodiment of the application, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0< f/f1+ f/f2< 0.5.

According to an embodiment of the present application, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.0< ET2/CT2-ET1/CT1< 1.5.

According to one embodiment of the present application, a combined focal length f12 of the first and second lenses and a combined focal length f34 of the third and fourth lenses satisfy: 0< f12/f34< 1.0.

According to an embodiment of the present application, the central thickness CT1 of the first lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy: 0< T12 × 50/CT1< 1.0.

According to an embodiment of the present application, a sum Σ AT of an air interval T23 on the optical axis of the second lens and the third lens and an air interval on the optical axis between any adjacent two lenses of the first lens to the fourth lens satisfies: 0< T23/Σ AT < 1.0.

According to one embodiment of the present application, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object-side surface of the third lens satisfy: 0< ET3/DT31< 1.0.

According to one embodiment of the present application, an on-axis distance SAG11 between an intersection point of the first lens object-side surface and the optical axis to an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection point of the second lens image-side surface and the optical axis to an effective radius vertex of the second lens image-side surface satisfy: 0.5< SAG22/SAG11< 1.0.

According to one embodiment of the present application, an on-axis distance SAG21 between an intersection of the second lens object-side surface and the optical axis to an effective radius vertex of the second lens object-side surface and an on-axis distance SAG41 between an intersection of the fourth lens object-side surface and the optical axis to an effective radius vertex of the fourth lens object-side surface satisfy: 0< SAG21/(SAG21+ SAG41) < 1.0.

According to one embodiment of the present application, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image-side surface of the third lens, and the maximum effective radius DT42 of the image-side surface of the fourth lens satisfy: 0< CT3/DT32+ CT4/DT42< 1.0.

According to one embodiment of the present application, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0< R1/(R3+ R4) < 1.0.

According to one embodiment of the present application, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0.3< R6/(R5+ R6) < 1.3.

According to one embodiment of the present application, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.3< R8/(R7+ R8) < 1.3.

According to one embodiment of the application, the fourth lens, having a power, has a convex object-side surface.

According to one embodiment of the present application, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH >3 mm.

According to one embodiment of the application, the entrance pupil diameter EPD of the optical imaging lens, the half of the diagonal length ImgH of the effective pixel area on the imaging plane, and the effective focal length f of the optical imaging lens satisfy: f/EPD-imgH/f < 2.

The present application further provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising:

a first lens having a positive optical power;

a fourth lens having an optical power;

wherein, the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfies: ImgH >3 mm;

the entrance pupil diameter EPD of the optical imaging lens, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the effective focal length f of the optical imaging lens meet the following requirements: f/EPD-imgH/f < 2.

According to one embodiment of the present application, a distance TTL between an object-side surface and an image plane of a first lens element of an optical imaging lens on an optical axis and an effective focal length f of the optical imaging lens satisfy: TTL/f < 1.1.

According to an embodiment of the present application, a distance BFL between an image-side surface of the last lens element and an image plane on an optical axis satisfies: 5.0mm < BFL <12.0 mm.

The invention has the beneficial effects that:

the optical imaging lens provided by the invention comprises a plurality of lenses, such as a first lens, a second lens and a third lens. The system can obtain a longer focal length on the premise of ensuring miniaturization by restricting the ratio range of the total length and the focal length of the optical imaging system, and is beneficial to improving the capability of the lens for highlighting a main body and the capability of shooting a distant scene; the distance from the image side surface of the last lens to the imaging surface on the optical axis is restricted, so that the lens has a larger telescopic length, and the ultra-thin electronic equipment is more suitable while a long focal length is obtained; the imaging effect of a large image plane of the system is realized by restricting the maximum half field angle of the imaging system and controlling the effective focal length of the imaging system, so that the system has high optical performance and a good processing technology; by restricting the ratio of the effective focal length of the imaging system to the diameter of the entrance pupil, the F number of the imaging system is small, the system can be ensured to have large aperture, and good imaging quality can be achieved in a dark environment.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a lens assembly of an optical imaging lens system according to embodiment 1 of the present invention;

fig. 2a to 2d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a lens assembly according to embodiment 2 of the present invention;

fig. 4a to 4d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, according to an optical imaging lens of embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of a lens assembly according to embodiment 3 of the present invention;

fig. 6a to 6d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of a lens assembly according to embodiment 4 of the present invention;

fig. 8a to 8d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 4 of the present invention;

FIG. 9 is a schematic diagram of a lens assembly of an optical imaging lens system according to embodiment 5 of the present invention;

fig. 10a to 10d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 5 of the present invention;

FIG. 11 is a schematic diagram of a lens assembly according to embodiment 6 of the present invention;

fig. 12a to 12d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, according to an optical imaging lens of embodiment 6 of the present invention;

FIG. 13 is a schematic diagram illustrating a lens assembly according to embodiment 7 of the optical imaging lens system of the present invention;

fig. 14a to 14d are diagrams illustrating an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 7 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only 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 invention.

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.

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.

In the description of the present invention, 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.

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 may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Exemplary embodiments

The optical imaging lens according to an exemplary embodiment of the present invention includes four lens elements, in order from an object side to an image side along an optical axis: the lens comprises a first lens, a second lens, a third lens and a fourth lens, wherein the lenses are independent from each other, and air spaces are formed between the lenses on an optical axis.

In the present exemplary embodiment, the distance TTL between the object side surface of the first lens element of the optical imaging lens and the imaging plane on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL/f < 1.1. This conditional constraint can make the system obtain longer focus under the prerequisite of guaranteeing the miniaturization, helps promoting the ability that the camera lens highlights the main part and shoots the scenery far away. More specifically, in the present exemplary embodiment, the optical imaging lens includes a distance TTL between an object-side surface of the first lens element and an image plane on the optical axis and an effective focal length f of the optical imaging lens satisfy: TTL/f is less than or equal to 1.0.

In the present exemplary embodiment, the distance BFL on the optical axis from the image-side surface of the last lens to the image plane satisfies: 5.0mm < BFL <12.0 mm. The distance from the image side surface of the last lens to the imaging surface on the optical axis is restricted, so that the lens has a larger telescopic length, and the ultrathin electronic equipment is more adaptive to the long focal length. More specifically, the distance BFL from the image-side surface of the last lens to the imaging surface on the optical axis satisfies: BFL is more than or equal to 5.61mm and less than or equal to 7.29 mm.

In the present exemplary embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH >3 mm. By controlling half of the diagonal length of the effective pixel area on the imaging surface, the imaging effect of the large image surface of the system is realized, and the system has higher optical performance. More specifically, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH is more than or equal to 3.27 mm.

In the present exemplary embodiment, the entrance pupil diameter EPD of the optical imaging lens, half of the diagonal length ImgH of the effective pixel area on the imaging plane, and the effective focal length f of the optical imaging lens satisfy: f/EPD-imgH/f < 2. Through reasonable control effective focal length and entrance pupil diameter ratio and half of effective pixel area diagonal length and effective focal length ratio on the imaging surface, the imaging system F number of the large image surface is smaller, the system can be ensured to have large aperture, and good imaging quality is also achieved in dark environment. More specifically, the entrance pupil diameter EPD of the optical imaging lens, the half of the diagonal length ImgH of the effective pixel area on the imaging surface, and the effective focal length f of the optical imaging lens satisfy: f/EPD-imgH/f is more than or equal to 1.56 and less than or equal to 1.96.

In the present exemplary embodiment, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: 0< f/f1+ f/f2< 0.5. By meeting the conditions, the focal power of the system is reasonably distributed, and the excessive concentration of the focal power of the shooting lens group is avoided, so that the aberration of the shooting lens group can be better corrected; on the other hand, the sensitivity of the first lens and the second lens is reduced, so that the application of the lens is more stable. More specifically, the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: f/f1+ f/f2 is more than or equal to 0.10 and less than or equal to 0.34.

In the present exemplary embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.0< ET2/CT2-ET1/CT1< 1.5. By satisfying the above conditions, the shape of the lens is effectively controlled, and it can be ensured that the first lens and the second lens have good processability. More specifically, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: ET2/CT2-ET1/CT1 is more than or equal to 1.04 and less than or equal to 1.32.

In the present exemplary embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 0< f12/f34< 1.0. By restricting the range of the ratio of the combined focal length of the first lens and the second lens to the combined focal length of the third lens and the fourth lens, the focal power of the system is reasonably distributed, so that the aberration generated by the front two lenses and the aberration generated by the rear two lenses are better balanced, good imaging quality is obtained, and the effect of high resolving power is realized. More specifically, a combined focal length f12 of the first lens and the second lens and a combined focal length f34 of the third lens and the fourth lens satisfy: f12/f34 is more than or equal to 0.27 and less than or equal to 0.68.

In the present exemplary embodiment, the center thickness CT1 of the first lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy: 0< T12 × 50/CT1< 1.0. By restricting the ratio range of the air space of the first lens and the second lens on the optical axis and the central thickness of the first lens on the optical axis, the field curvature contribution of the first lens is reasonably controlled, so that the system has reasonable field curvature. More specifically, the center thickness CT1 of the first lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy: T12X 50/CT1 is more than or equal to 0.3 and less than or equal to 0.8.

In the present exemplary embodiment, the sum Σ AT of the air interval T23 on the optical axis of the second lens and the third lens and the air interval on the optical axis between any adjacent two lenses of the first lens to the fourth lens satisfies: 0< T23/Σ AT < 1.0. By satisfying the above conditions, the curvature of field generated by the front lens and the curvature of field generated by the rear lens of the system can be balanced, so that the curvature of field of the system is balanced in a reasonable state. More specifically, the sum Σ AT of the air interval T23 on the optical axis of the second lens and the third lens and the air interval on the optical axis between any adjacent two lenses of the first lens to the fourth lens satisfies: T23/Sigma AT is more than or equal to 0.55 and less than or equal to 0.98.

In the present exemplary embodiment, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object-side surface of the third lens satisfy: 0< ET3/DT31< 1.0. The shape of the third lens is effectively controlled by controlling the ratio of the edge thickness of the third lens to the maximum effective radius of the object side surface of the third lens within a reasonable range, so that the injection molding is facilitated, and the third lens has good processability. More specifically, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object-side surface of the third lens satisfy: ET3/DT31 is more than or equal to 0.21 and less than or equal to 0.50.

In the present exemplary embodiment, an on-axis distance SAG11 between the intersection of the first lens object-side surface and the optical axis to the effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between the intersection of the second lens image-side surface and the optical axis to the effective radius vertex of the second lens image-side surface satisfy: 0.5< SAG22/SAG11< 1.0. Through satisfying above-mentioned condition, the degree of curvature of first lens and second lens of effective control reduces first lens and second lens sensitivity, does benefit to processing and shaping more simultaneously, improves the equipment yield and ensures better imaging quality. More specifically, an on-axis distance SAG11 between an intersection point of the first lens object-side surface and the optical axis to an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection point of the second lens image-side surface and the optical axis to an effective radius vertex of the second lens image-side surface satisfy: 0.57 is less than or equal to SAG22/SAG11 is less than or equal to 0.65.

In the present exemplary embodiment, an on-axis distance SAG21 between the intersection of the second lens object-side surface and the optical axis to the effective radius vertex of the second lens object-side surface and an on-axis distance SAG41 between the intersection of the fourth lens object-side surface and the optical axis to the effective radius vertex of the fourth lens object-side surface satisfy: 0< SAG21/(SAG21+ SAG41) < 1.0. By meeting the conditions, the size layout of the lens is more reasonable, the assembly of the lens is facilitated, the yield of mass production is improved, and the use stability of the lens is enhanced; meanwhile, aberration contributions of the second lens and the fourth lens are reasonably controlled, so that the system has better imaging quality. More specifically, an on-axis distance SAG21 between an intersection of the second lens object-side surface and the optical axis and an effective radius vertex of the second lens object-side surface and an on-axis distance SAG41 between an intersection of the fourth lens object-side surface and the optical axis and an effective radius vertex of the fourth lens object-side surface satisfy: 0.47-0.74 of SAG21/(SAG21+ SAG 41).

In the present exemplary embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image-side surface of the third lens, and the maximum effective radius DT42 of the image-side surface of the fourth lens satisfy: 0< CT3/DT32+ CT4/DT42< 1.0. By meeting the conditions, the ratio of the thickness to the outer diameter of the third lens and the fourth lens is reasonably controlled, the molding and assembling problems of the lenses are guaranteed, and the system has better imaging quality, lower sensitivity, easy injection molding and higher yield. More specifically, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the maximum effective radius DT32 of the image-side surface of the third lens and the maximum effective radius DT42 of the image-side surface of the fourth lens satisfy: 0.33 is less than or equal to CT3/DT32+ CT4/DT42 is less than or equal to 0.73.

In the present exemplary embodiment, the radius of curvature R1 of the first lens object-side surface, the radius of curvature R3 of the second lens object-side surface, and the radius of curvature R4 of the second lens image-side surface satisfy: 0< R1/(R3+ R4) < 1.0. The on-axis aberration generated by the image pickup optical system can be effectively balanced by reasonably controlling the ratio of the curvature radius of the object side surface of the first lens to the curvature radius of the object side surface and the curvature radius of the image side surface of the second lens to be within a certain interval. More specifically, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: R1/(R3+ R4) is not less than 0.55 and not more than 0.78.

In the present exemplary embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.3< R6/(R5+ R6) < 1.3. The curvatures of the two sides of the third lens are reasonably controlled through the above conditions, so that the generation of image blur is avoided, and meanwhile, ghost images formed by reflection of the third lens are avoided. More specifically, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: R6/(R5+ R6) is more than or equal to 0.45 and less than or equal to 1.00.

In the present exemplary embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.3< R8/(R7+ R8) < 1.3. The ratio of the curvature radius of the image side surface of the fourth lens to the sum of the curvature radii of the object side surface and the image side surface of the fourth lens is controlled within a reasonable range, the angle of the chief ray of the optical imaging lens is adjusted, the relative brightness of the optical imaging lens group can be effectively improved, and the image plane definition is improved. More specifically, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: R8/(R7+ R8) is more than or equal to 0.48 and less than or equal to 1.02.

In the present exemplary embodiment, the fourth lens having optical power has a convex object-side surface. The fourth lens with focal power is used for helping the lens group to balance vertical axis chromatic aberration and transverse chromatic aberration; the object side surface is a convex surface, so that the aberration of a marginal field of view can be effectively reduced while the light transmission quantity is increased, the reasonable distribution of focal power of the whole lens group is facilitated, and the imaging quality is improved.

In the present exemplary embodiment, the object-side surface and the image-side surface of any one of the first lens E1 through the fourth lens E4 are aspheric, and the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric 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 being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.

The optical imaging lens according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above four lenses. The optical imaging lens has the characteristics of large imaging image surface, wide imaging range and high imaging quality by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, and the ultrathin property of the mobile phone is ensured.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the fourth lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, and the fourth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens and the fourth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

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

Specific embodiments of an optical imaging lens suitable for the above-described embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, wherein the optical imaging lens includes, in order from an object side to an image side along an optical axis: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

The first lens element E1 has positive 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 has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.

As shown in table 1, a basic parameter table of the optical imaging lens of embodiment 1 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 1

As shown in table 2, in embodiment 1, the total effective focal length f of the optical imaging lens is 11.34mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 11.33mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 15.9 °.

TABLE 2

The optical imaging lens in embodiment 1 satisfies:

TTL/f is 1.00; wherein, TTL is a distance on an optical axis from an object side surface of the first lens element of the optical imaging lens to the imaging plane, and f is an effective focal length of the optical imaging lens.

f/EPD-imgH/f is 1.78; wherein f is the effective focal length of the optical imaging lens, EPD is the entrance pupil diameter of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

f/f1+ f/f2 is 0.22; wherein f is the effective focal length of the optical imaging lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

ET2/CT2-ET1/CT1 is 1.14; wherein CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, ET1 is the edge thickness of the first lens, and ET2 is the edge thickness of the second lens.

f12/f34 is 0.62; where f12 is the combined focal length of the first lens and the second lens, and f34 is the combined focal length of the third lens and the fourth lens.

T12 × 50/CT1 ═ 0.46; where CT1 is the center thickness of the first lens on the optical axis, and T12 is the air space between the first lens and the second lens on the optical axis.

T23/Σ AT 0.98; where T23 is an air space on the optical axis between the second lens and the third lens, and Σ AT is a sum of air spaces on the optical axis between any adjacent two of the first lens to the fourth lens.

ET3/DT31 ═ 0.30; where ET3 is the edge thickness of the third lens and DT31 is the maximum effective radius of the object-side surface of the third lens.

SAG22/SAG11 is 0.65; SAG11 is an on-axis distance from an intersection point of the object side surface of the first lens and the optical axis to an effective radius vertex of the object side surface of the first lens, and SAG22 is an on-axis distance from an intersection point of the image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens.

SAG21/(SAG21+ SAG41) ═ 0.55; SAG21 is an on-axis distance from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens, and SAG41 is an on-axis distance from an intersection point of the object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens.

CT3/DT32+ CT4/DT42 is 0.48; wherein CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, DT32 is the maximum effective radius of the image-side surface of the third lens, and DT42 is the maximum effective radius of the image-side surface of the fourth lens.

R1/(R3+ R4) ═ 0.59; wherein, R1 is the curvature radius of the object side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, and R4 is the curvature radius of the image side surface of the second lens.

R6/(R5+ R6) ═ 0.54; wherein, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

R8/(R7+ R8) ═ 0.53; wherein, 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.

In example 1, the object-side surface and the image-side surface of any one of the first lens E1 through the fourth lens E4 are aspheric, and table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.0829E-03

-1.0163E-03

1.9997E-03

-2.4502E-03

1.9228E-03

-1.0154E-03

3.7338E-04

S2

6.3516E-04

2.7938E-02

-6.0622E-02

7.5122E-02

-6.0780E-02

3.3971E-02

-1.3527E-02

S3

-1.4778E-02

2.8682E-02

-5.7059E-02

7.1071E-02

-5.8042E-02

3.2574E-02

-1.2910E-02

S4

-3.4386E-02

1.3239E-02

-3.1786E-02

6.1720E-02

-8.3283E-02

7.7728E-02

-5.0986E-02

S5

-4.1029E-02

1.7298E-01

-3.2923E-01

4.7582E-01

-5.2961E-01

4.5057E-01

-2.9271E-01

S6

-1.0950E-01

3.2917E-01

-5.6647E-01

7.5452E-01

-7.7345E-01

5.9617E-01

-3.3995E-01

S7

-6.9036E-02

1.2593E-01

-1.6035E-01

1.4175E-01

-8.1604E-02

1.9183E-02

1.3216E-02

S8

5.6517E-02

-1.7933E-01

3.5127E-01

-5.1082E-01

5.5213E-01

-4.4566E-01

2.6901E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-9.7373E-05

1.8091E-05

-2.3721E-06

2.1377E-07

-1.2544E-08

4.2916E-10

-6.4467E-12

S2

3.8960E-03

-8.1387E-04

1.2210E-04

-1.2817E-05

8.9346E-07

-3.7141E-08

6.9663E-10

S3

3.6560E-03

-7.3789E-04

1.0422E-04

-9.8970E-06

5.8375E-07

-1.8050E-08

1.7841E-10

S4

2.3641E-02

-7.6931E-03

1.7160E-03

-2.4955E-04

2.1292E-05

-8.0789E-07

0.0000E+00

S5

1.4514E-01

-5.4633E-02

1.5383E-02

-3.1441E-03

4.4066E-04

-3.7844E-05

1.4988E-06

S6

1.4148E-01

-4.2209E-02

8.7606E-03

-1.1986E-03

9.7032E-05

-3.5176E-06

0.0000E+00

S7

-1.6205E-02

8.5865E-03

-2.8035E-03

5.9448E-04

-8.0029E-05

6.2307E-06

-2.1398E-07

S8

-1.2107E-01

4.0278E-02

-9.7357E-03

1.6579E-03

-1.8817E-04

1.2757E-05

-3.9030E-07

TABLE 3

Fig. 2a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 2a to 2d, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Specific example 2

Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the optical imaging lens, in order from an object side to an image side along an optical axis, includes: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

The first lens element E1 has positive 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 has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.

As shown in table 4, the basic parameter table of the optical imaging lens of embodiment 2 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 4

As shown in table 5, in embodiment 2, the total effective focal length f of the optical imaging lens is 11.34mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 11.34mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 15.7 °.

TABLE 5

In example 2, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.0345E-04

4.8732E-04

-9.2446E-04

9.5983E-04

-6.3921E-04

2.8940E-04

-9.1962E-05

S2

-4.9698E-03

3.3262E-02

-4.3905E-02

3.5057E-02

-1.8909E-02

7.1771E-03

-1.9519E-03

S3

-2.6769E-02

3.6349E-02

-3.8938E-02

2.6690E-02

-1.1053E-02

2.0958E-03

3.9201E-04

S4

-4.2749E-02

5.9155E-03

1.7300E-02

-4.1198E-02

4.9374E-02

-3.8310E-02

2.0395E-02

S5

-2.1239E-02

8.2347E-02

-1.2245E-01

1.4745E-01

-1.4514E-01

1.1366E-01

-6.9433E-02

S6

5.4939E-02

2.2626E-02

-5.9747E-02

6.9831E-02

-5.7454E-02

3.6391E-02

-1.8412E-02

S7

-3.7947E-02

7.3712E-02

-1.1906E-01

1.5636E-01

-1.6475E-01

1.3485E-01

-8.3803E-02

S8

8.4870E-03

-3.4248E-02

6.2465E-02

-7.9726E-02

7.0780E-02

-4.4069E-02

1.9051E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.0869E-05

-3.3988E-06

3.9419E-07

-3.1771E-08

1.6911E-09

-5.3452E-11

7.5989E-13

S2

3.8180E-04

-5.3212E-05

5.1474E-06

-3.2748E-07

1.2232E-08

-1.9623E-10

-4.1564E-13

S3

-3.9542E-04

1.3182E-04

-2.6135E-05

3.3332E-06

-2.6942E-07

1.2615E-08

-2.6135E-10

S4

-7.5924E-03

1.9736E-03

-3.5082E-04

4.0607E-05

-2.7543E-06

8.2928E-08

0.0000E+00

S5

3.2562E-02

-1.1526E-02

3.0103E-03

-5.6045E-04

7.0183E-05

-5.2872E-06

1.8076E-07

S6

7.4407E-03

-2.3194E-03

5.2667E-04

-8.0692E-05

7.3796E-06

-3.0240E-07

0.0000E+00

S7

3.8917E-02

-1.3314E-02

3.2929E-03

-5.7108E-04

6.5773E-05

-4.5138E-06

1.3962E-07

S8

-5.5048E-03

9.4311E-04

-4.5417E-05

-1.8428E-05

4.5906E-06

-4.5496E-07

1.7706E-08

TABLE 6

Fig. 4a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4c shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 4a to 4d, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Specific example 3

Fig. 5 is a lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

As shown in table 7, the basic parameter table of the optical imaging lens of embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

TABLE 7

As shown in table 8, in embodiment 3, the total effective focal length f of the optical imaging lens is 11.34mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 10.79mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 15.9 °.

TABLE 8

In example 3, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 9 shows the high-order term coefficients a usable for the aspheric mirror surfaces S1 to S14 in example 3₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

TABLE 9

Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6c shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 6a to 6d, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 7 is a lens assembly structure of the optical imaging lens system according to embodiment 4 of the present invention, which, in order from an object side to an image side along an optical axis, includes: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

The first lens element E1 has positive 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 has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.

As shown in table 10, the basic parameter table of the optical imaging lens of embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Watch 10

As shown in table 11, in embodiment 4, the total effective focal length f of the optical imaging lens is 12.22mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 11.77mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 14.7 °.

TABLE 11

In example 4, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

6.4041E-04

-1.0313E-03

1.5859E-03

-1.4777E-03

9.1133E-04

-3.9158E-04

1.2042E-04

S2

-1.3203E-03

3.8888E-02

-5.5115E-02

4.4293E-02

-2.3633E-02

8.8528E-03

-2.3796E-03

S3

-2.6184E-02

3.5205E-02

-2.7598E-02

2.6357E-03

1.4202E-02

-1.4485E-02

7.8710E-03

S4

-4.1557E-02

2.7909E-03

3.4067E-02

-7.0381E-02

7.7216E-02

-5.5327E-02

2.7556E-02

S5

-3.4832E-02

1.1786E-01

-1.7788E-01

2.0874E-01

-1.9445E-01

1.4211E-01

-8.0565E-02

S6

-1.3944E-01

3.9564E-01

-6.3468E-01

7.2833E-01

-6.0753E-01

3.6787E-01

-1.5998E-01

S7

-1.2521E-01

3.1809E-01

-5.0222E-01

5.5334E-01

-4.3348E-01

2.3858E-01

-8.7730E-02

S8

2.5146E-02

-1.0276E-01

2.6716E-01

-4.9683E-01

6.6267E-01

-6.4218E-01

4.5667E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.6836E-05

4.3377E-06

-5.0300E-07

4.0745E-08

-2.1875E-09

6.9899E-11

-1.0058E-12

S2

4.5931E-04

-6.2403E-05

5.6606E-06

-2.9895E-07

4.7279E-09

3.4142E-10

-1.4683E-11

S3

-2.8122E-03

6.9972E-04

-1.2272E-04

1.4932E-05

-1.2024E-06

5.7686E-08

-1.2490E-09

S4

-9.7526E-03

2.4517E-03

-4.2828E-04

4.9358E-05

-3.3613E-06

1.0180E-07

0.0000E+00

S5

3.5020E-02

-1.1499E-02

2.7914E-03

-4.8415E-04

5.6619E-05

-3.9923E-06

1.2799E-07

S6

4.8715E-02

-9.8274E-03

1.1428E-03

-3.8562E-05

-6.4339E-06

5.9364E-07

0.0000E+00

S7

1.7930E-02

3.0264E-04

-1.4396E-03

4.6166E-04

-7.5882E-05

6.6959E-06

-2.5162E-07

S8

-2.3931E-01

9.2099E-02

-2.5675E-02

5.0390E-03

-6.5961E-04

5.1654E-05

-1.8292E-06

TABLE 12

Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8c shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8a to 8d, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

Specific example 5

Fig. 9 is a lens assembly structure of the optical imaging lens system according to embodiment 5 of the present invention, which, in order from an object side to an image side along an optical axis, includes: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

The first lens element E1 has positive 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 has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.

As shown in table 13, the basic parameter table of the optical imaging lens of example 5 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Watch 13

As shown in table 14, in embodiment 5, the total effective focal length f of the optical imaging lens is 12.22mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 11.73mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 14.7 °.

TABLE 14

In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric, and table 15 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 5₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

8.2976E-04

-6.3205E-04

9.0280E-04

-8.4087E-04

5.4586E-04

-2.5654E-04

8.9040E-05

S2

-4.3351E-02

1.2037E-01

-1.5680E-01

1.3333E-01

-7.9935E-02

3.5012E-02

-1.1413E-02

S3

-5.6855E-02

1.0028E-01

-1.0910E-01

7.5397E-02

-3.3459E-02

8.7947E-03

-7.7465E-04

S4

-4.0798E-02

-7.3138E-03

6.0565E-02

-1.1173E-01

1.2027E-01

-8.6569E-02

4.3380E-02

S5

-1.9366E-02

6.3288E-02

-7.8866E-02

8.6326E-02

-8.3955E-02

6.6521E-02

-4.0846E-02

S6

-7.1491E-02

2.1477E-01

-3.1292E-01

3.4550E-01

-2.9863E-01

2.0063E-01

-1.0353E-01

S7

-5.1427E-02

5.1348E-02

3.0221E-02

-1.6075E-01

2.4365E-01

-2.2558E-01

1.4387E-01

S8

3.7100E-02

-1.3252E-01

2.8109E-01

-4.1412E-01

4.3689E-01

-3.3712E-01

1.9241E-01

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.2854E-05

4.2921E-06

-5.7840E-07

5.4179E-08

-3.3375E-09

1.2123E-10

-1.9630E-12

S2

2.7885E-03

-5.0883E-04

6.8326E-05

-6.5512E-06

4.2421E-07

-1.6613E-08

2.9694E-10

S3

-3.4149E-04

1.5797E-04

-3.3360E-05

4.2578E-06

-3.3576E-07

1.5129E-08

-2.9905E-10

S4

-1.5324E-02

3.8004E-03

-6.4734E-04

7.2061E-05

-4.7151E-06

1.3728E-07

0.0000E+00

S5

1.8986E-02

-6.5741E-03

1.6641E-03

-2.9877E-04

3.6036E-05

-2.6192E-06

8.6708E-08

S6

4.0377E-02

-1.1619E-02

2.3789E-03

-3.2658E-04

2.6878E-05

-1.0006E-06

0.0000E+00

S7

-6.5797E-02

2.1837E-02

-5.2279E-03

8.8092E-04

-9.9168E-05

6.6953E-06

-2.0499E-07

S8

-8.1589E-02

2.5619E-02

-5.8775E-03

9.5758E-04

-1.0495E-04

6.9372E-06

-2.0896E-07

Watch 15

Fig. 10a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10c shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 10a to 10d, the optical imaging lens according to embodiment 5 can achieve good imaging quality.

Specific example 6

Fig. 11 is a lens assembly according to embodiment 6 of the present invention, which, in order from an object side to an image side along an optical axis, includes: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

As shown in table 16, the basic parameter table of the optical imaging lens of example 6 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

TABLE 16

As shown in table 17, in embodiment 6, the total effective focal length f of the optical imaging lens is 11.50mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 11.22mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 15.5 °.

TABLE 17

In example 6, the object-side surface and the image-side surface of any one of the first lens element E1 to the fourth lens element E4 are aspheric, and table 18 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 6₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.2072E-03

-1.8446E-03

3.3738E-03

-3.6462E-03

2.5930E-03

-1.2718E-03

4.4214E-04

S2

2.2387E-03

1.8229E-02

-2.6286E-02

2.2942E-02

-1.3952E-02

6.1610E-03

-2.0084E-03

S3

-1.5645E-02

2.1193E-02

-2.9504E-02

2.8319E-02

-2.0123E-02

1.0867E-02

-4.4544E-03

S4

-2.7820E-02

7.8216E-03

-6.2061E-03

3.2540E-03

-8.2096E-04

8.0171E-05

2.1223E-06

S5

2.5519E-02

9.1422E-03

-1.9596E-02

1.4559E-02

-1.9058E-03

-7.9538E-03

9.7383E-03

S6

8.3372E-02

-3.7897E-02

3.5300E-02

-4.9763E-02

6.0683E-02

-5.2840E-02

3.2240E-02

S7

3.4875E-02

-3.6574E-02

1.9819E-02

2.3678E-03

-2.2720E-02

3.0007E-02

-2.3430E-02

S8

9.0004E-03

-1.5053E-02

8.3177E-03

3.2987E-04

-6.7440E-03

7.0090E-03

-3.5100E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.1050E-04

1.9906E-05

-2.5606E-06

2.2925E-07

-1.3563E-08

4.7624E-10

-7.5113E-12

S2

4.8574E-04

-8.6817E-05

1.1304E-05

-1.0412E-06

6.4243E-08

-2.3799E-09

3.9993E-11

S3

1.3755E-03

-3.1649E-04

5.3265E-05

-6.3518E-06

5.0726E-07

-2.4295E-08

5.2690E-10

S4

-6.6256E-07

0.0000E+00

S5

-6.2306E-03

2.5263E-03

-6.6876E-04

1.1233E-04

-1.0886E-05

4.6403E-07

0.0000E+00

S6

-1.3670E-02

3.9353E-03

-7.3241E-04

7.9405E-05

-3.8059E-06

0.0000E+00

S7

1.2414E-02

-4.6418E-03

1.2320E-03

-2.2793E-04

2.8024E-05

-2.0620E-06

6.8811E-08

S8

6.9984E-04

1.8843E-04

-1.6796E-04

5.1695E-05

-8.6472E-06

7.8123E-07

-2.9985E-08

Watch 18

Fig. 12a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12c shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 12a to 12d, the optical imaging lens according to embodiment 6 can achieve good imaging quality.

Specific example 7

Fig. 13 is a lens assembly according to embodiment 7 of the present invention, which, in order from an object side to an image side along an optical axis, includes: the lens system comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

The first lens element E1 has positive 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 has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.

As shown in table 19, the basic parameter table of the optical imaging lens of example 7 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Watch 19

As shown in table 20, in embodiment 7, the total effective focal length f of the optical imaging lens is 12.04mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 11.54mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 3.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 14.9 °.

Watch 20

In example 7, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 are aspheric, and table 21 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 7₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₀A₂₄、A₂₆、A₂₈And A₃₀。

TABLE 21

Fig. 14a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14c shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 14a to 14d, the optical imaging lens according to embodiment 7 can achieve good imaging quality.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, improvements, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising:

a first lens having a positive optical power;

a fourth lens having an optical power;

2. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0< f/f1+ f/f2< 0.5.

3. The optical imaging lens of claim 1, wherein the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.0< ET2/CT2-ET1/CT1< 1.5.

4. The optical imaging lens of claim 1, wherein the combined focal length f12 of the first and second lenses and the combined focal length f34 of the third and fourth lenses satisfy: 0< f12/f34< 1.0.

5. The optical imaging lens of claim 1, wherein the central thickness CT1 of the first lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy: 0< T12 × 50/CT1< 1.0.

6. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising:

a first lens having a positive optical power;

a fourth lens having an optical power;

7. The optical imaging lens of claim 6, wherein the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 0.3< R8/(R7+ R8) < 1.3.

8. The optical imaging lens of claim 6, characterized in that the fourth lens having optical power has a convex object-side surface.

9. The optical imaging lens of claim 6, wherein the distance TTL between the object-side surface of the first lens element and the imaging surface on the optical axis and the effective focal length f of the optical imaging lens satisfy: TTL/f < 1.1.

10. The optical imaging lens of claim 6, wherein a distance BFL between the image-side surface of the last lens element and the image plane on the optical axis satisfies: 5.0mm < BFL <12.0 mm.