CN114706193B

CN114706193B - Optical imaging lens

Info

Publication number: CN114706193B
Application number: CN202210356912.7A
Authority: CN
Inventors: 李建林; 邢天祥; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-04-01
Filing date: 2022-04-01
Publication date: 2024-04-02
Anticipated expiration: 2042-04-01
Also published as: CN114706193A

Abstract

The application discloses optical imaging lens, it includes in order from the object side to the image side along the optical axis: a first lens having optical power; a second lens having positive optical power; a third lens having negative optical power; a fourth lens having optical power. The entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens satisfy: f/EPD > 4.

Description

Optical imaging lens

Technical Field

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

Background

In recent years, portable electronic products such as smart phones and the like are rapidly developed, and users have higher and higher requirements on functions of the smart phones and the like, particularly requirements on photographing functions of the mobile phones, and the conventional lens cannot meet the requirements of the users. In order to develop an optical imaging lens mounted on a smart phone in a direction of higher definition, higher imaging quality, and the like, a tele lens is favored by many lens manufacturers. However, the overall length of the conventional tele lens is long, which severely limits the miniaturization development of the optical imaging lens, and further hinders the miniaturization development of the smart phone.

Disclosure of Invention

An aspect of the present application provides an optical imaging lens including, in order from an object side to an image side along an optical axis: a first lens having optical power; a second lens having positive optical power; a third lens having negative optical power; a fourth lens having optical power. The entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens may satisfy: f/EPD > 4.

In one embodiment, the optical imaging lens may satisfy: T34/(T12+T23). Gtoreq.1.89, wherein T12 is the air space on the optical axis of the first lens and the second lens, T23 is the air space on the optical axis of the second lens and the third lens, and T34 is the air space on the optical axis of the third lens and the fourth lens.

In one embodiment, the optical imaging lens may satisfy: 0 < f12/f < 1, wherein f12 is the combined focal length of the first lens and the second lens, and f is the total effective focal length of the optical imaging lens.

In one embodiment, the optical imaging lens may satisfy: CT2/CT3 < 3, wherein CT3 is the center thickness of the third lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

In one embodiment, the optical imaging lens may satisfy: 1.6 < f1/EPD < 4, where EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens.

In one embodiment, the optical imaging lens may satisfy: 0 < (R1+R3+R6)/(f1+f2+f3) < 1.2, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R1 is the radius of curvature of the object side of the first lens, R3 is the radius of curvature of the object side of the second lens, and R6 is the radius of curvature of the image side of the third lens.

In one embodiment, the optical imaging lens may satisfy: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image side of the third lens.

In one embodiment, the optical imaging lens may satisfy: DT31/DT21 < 1, where DT21 is the effective radius of the object-side surface of the second lens and DT31 is the effective radius of the object-side surface of the third lens.

In one embodiment, the optical imaging lens may satisfy: ET3/CT3 is equal to or greater than ETn/CTn, wherein ET3 is the edge thickness of the third lens, CT3 is the center thickness of the third lens on the optical axis, ETn is the edge thickness of any one of the first lens, the second lens and the fourth lens, and CTn is the center thickness of any one of the first lens, the second lens and the fourth lens on the optical axis.

In one embodiment, the optical imaging lens may satisfy: 1.4 < (N1+N2+N3+N4)/4 < 1.8, where N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens.

In one embodiment, the optical imaging lens may satisfy: TTL/f < 1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens.

In one embodiment, the optical imaging lens includes a stop between the first lens and the second lens, the optical imaging lens satisfying: 0.8 < SL/TTL < 1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis.

In one embodiment, the optical imaging lens may satisfy: tan (Semi-FOV) ×f > 3mm, where Semi-FOV is half of the maximum field angle of the optical imaging lens and f is the total effective focal length of the optical imaging lens.

In one embodiment, the optical imaging lens may satisfy: 0.2 < BFL/f < 0.8, wherein BFL is the distance on the optical axis from the image side surface of the fourth lens to the imaging surface of the optical imaging lens, and f is the total effective focal length of the optical imaging lens.

In one embodiment, the optical imaging lens further includes a prism located between the object side and the first lens, the prism reflecting light incident to the prism in an incident direction to exit from the prism in an optical axis direction.

Another aspect of the present application provides an optical imaging lens. The optical imaging lens sequentially comprises, from an object side to an image side along an optical axis: a first lens with positive focal power, the object side surface of which is a convex surface; a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; and a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; the total effective focal length f of the optical imaging lens can satisfy: f is more than 13mm.

In one embodiment, the entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens may satisfy: f/EPD > 4.

The optical imaging lens has the beneficial effects of long focus, miniaturization, good imaging quality and the like, and is applicable to portable electronic products by reasonably distributing the focal power, the surface shape and the optimized optical parameters of each lens.

Drawings

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

Fig. 1 shows a schematic configuration diagram of an optical imaging lens according to embodiment 1 of the present application;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 1;

fig. 3 shows a schematic structural view of an optical imaging lens according to embodiment 2 of the present application;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 2;

fig. 5 shows a schematic structural view of an optical imaging lens according to embodiment 3 of the present application;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 3;

fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 4;

fig. 9 shows a schematic structural view of an optical imaging lens according to embodiment 5 of the present application;

fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 5;

Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application;

fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 6;

fig. 13 shows a schematic structural view of an optical imaging lens according to embodiment 7 of the present application; and

fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens of embodiment 7, respectively.

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 these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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.

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

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation on the one hand. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale. On the other hand, the shape of the prism is slightly exaggerated and simplified at the same time in the drawing. Specifically, the shape of the prism shown in the drawings is shown by way of planar example. In practical applications, the size and structure of the prism may be specifically designed according to practical conditions.

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, then 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

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

An optical imaging lens according to an exemplary embodiment of the present application may include a prism and four lenses having optical power. The four lenses having optical power are a first lens, a second lens, a third lens, and a fourth lens, respectively. As shown in fig. 1, the prism T may reflect light incident to the prism T in an incident direction Y, which may be perpendicular to the optical axis direction X, to exit the prism T in the optical axis direction X. The four lenses are arranged in order from the prism to the image side along the optical axis. Any two adjacent lenses in the first lens to the fourth lens can have a spacing distance.

In an exemplary embodiment, by providing a prism in the optical imaging lens, light rays may be deflected through the prism by a certain angle to adjust the total effective focal length of the optical imaging lens.

In an exemplary embodiment, the first lens may have positive or negative optical power; the second lens may have positive optical power; the third lens may have negative optical power; the fourth lens may have positive or negative optical power. The focal power of the first lens to the focal power of the fourth lens are reasonably arranged, so that the focal power of each lens can be matched with each other, smaller aberration can be realized, and the lens optimization time can be shortened.

In another exemplary embodiment, the first lens may have positive optical power, and its object-side surface may be convex; the second lens element may have positive refractive power, wherein the object-side surface thereof may be convex, and the image-side surface thereof may be concave; the third lens element may have negative refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the fourth lens element may have positive refractive power, wherein an object-side surface thereof may be convex and an image-side surface thereof may be concave. Through the optical power and the face type of rationally setting up first lens to fourth lens, if through the optical power of rationally setting up the second lens, be favorable to second lens and other lens reasonable collocations to be favorable to realizing less aberration, shorten the camera lens optimization time.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f/EPD > 4, where EPD is the entrance pupil diameter of the optical imaging lens and f is the total effective focal length of the optical imaging lens. More specifically, f and EPD may further satisfy: f/EPD > 4.4. Satisfies f/EPD > 4, is favorable to controlling the ability of camera lens to accomodate light to be favorable to improving the relative illuminance of camera lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: T34/(T12+T23). Gtoreq.1.89, wherein T12 is the air space on the optical axis of the first lens and the second lens, T23 is the air space on the optical axis of the second lens and the third lens, and T34 is the air space on the optical axis of the third lens and the fourth lens. Satisfies T34/(T12+T23) not less than 1.89, and is favorable for effectively reducing the sensitivity of the thickness of the air gap of the lens and correcting curvature of field.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < f12/f < 1, wherein f12 is the combined focal length of the first lens and the second lens, and f is the total effective focal length of the optical imaging lens. More specifically, f12 and f further satisfy: f12/f is more than 0.3 and less than 0.5. Satisfies 0 < f12/f < 1, is beneficial to realizing the characteristic of large field of view of the object space, is beneficial to correcting the off-axis aberration of the lens, and improves the imaging quality of the lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: CT2/CT3 < 3, wherein CT3 is the center thickness of the third lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. More specifically, CT2 and CT3 may further satisfy: CT2/CT3 is less than or equal to 0.88 and less than or equal to 2.1. The lens satisfies CT2/CT3 less than or equal to 0.88, is beneficial to reducing the thickness sensitivity of the lens and is beneficial to correcting field curvature.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.6 < f1/EPD < 4, where EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens. More specifically, EPD and f1 may further satisfy: 2.2 < f1/EPD < 3.5. Satisfies 1.6 < f1/EPD < 4, is beneficial to controlling the angle of view of the lens and reducing the effective radius of the first lens, thereby being beneficial to satisfying the processing requirement of the first lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < (R1+R3+R6)/(f1+f2+f3) < 1.2, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R1 is the radius of curvature of the object side of the first lens, R3 is the radius of curvature of the object side of the second lens, and R6 is the radius of curvature of the image side of the third lens. More specifically, R1, R3, R6, f1, f2, and f3 may further satisfy: 0.2 < (R1+R3+R6)/(f1+f2+f3) < 0.8. Satisfies 0 < (R1+R3+R6)/(f1+f2+f3) < 1.2, and is favorable for effectively matching the focal power among the lenses, thereby effectively reducing on-axis chromatic aberration, correcting astigmatism and field curvature of the lens, facilitating the matching of the Chief Ray Angle (CRA) of the lens, and realizing better imaging quality.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image side of the third lens. More specifically, f3 and R6 may further satisfy: -2.1 < f3/R6 < -1.5. Satisfies-3 < f3/R6 < -0.5, is favorable for reasonably controlling the curvature of the image side surface of the third lens, ensures that the field curvature contribution quantity is in a reasonable range, and reduces the surface type sensitivity of the image side surface of the third lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: DT31/DT21 < 1, where DT21 is the effective radius of the object-side surface of the second lens and DT31 is the effective radius of the object-side surface of the third lens. Satisfies DT31/DT21 < 1, is favorable to controlling the convergence of each light of the visual field in the lens, and is favorable to improving the imaging quality of the visual field in the lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: ET3/CT3 is equal to or greater than ETn/CTn, wherein ET3 is the edge thickness of the third lens, CT3 is the center thickness of the third lens on the optical axis, ETn is the edge thickness of any one of the first lens, the second lens and the fourth lens, CTn is the center thickness of any one of the first lens, the second lens and the fourth lens on the optical axis, and n is selected from 1, 2 or 4. Meets ET3/CT3 not less than ETn/CTn, and is beneficial to the processing and forming of each lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.4 < (N1+N2+N3+N4)/4 < 1.8, where N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens. More specifically, N1, N2, N3, and N4 may further satisfy: 1.5 < (N1+N2+N3+N4)/4 < 1.7. Satisfies 1.4 < (N1+N2+N3+N4)/4 < 1.8, is favorable for optimizing good imaging effect while reducing cost, reduces the influence of chromatic aberration on a lens, and improves imaging quality.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: TTL/f < 1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens. The TTL/f is smaller than 1, which is beneficial to the characteristics of the long focus of the lens, the small depth of field, high magnification, miniaturization and the like.

In an exemplary embodiment, the optical imaging lens according to the present application further includes a stop disposed between the first lens and the second lens. Illustratively, an optical imaging lens may satisfy: 0.8 < SL/TTL < 1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis. The lens satisfies 0.8 < SL/TTL < 1, is beneficial to improving the imaging quality of the lens and reducing the design difficulty of the lens while controlling the total length of the lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: tan (Semi-FOV) ×f > 3mm, where Semi-FOV is half of the maximum field angle of the optical imaging lens and f is the total effective focal length of the optical imaging lens. More specifically, the Semi-FOV may further satisfy: tan (Semi-FOV). Times.f.gtoreq.3.5 mm. Meets the requirement of Tan (Semi-FOV) x f > 3mm, and is favorable for enabling the imaging size of the lens to meet the requirement of chip size.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.2 < BFL/f < 0.8, wherein BFL is the distance on the optical axis from the image side surface of the fourth lens to the imaging surface of the optical imaging lens, and f is the total effective focal length of the optical imaging lens. More specifically, BFL and f may further satisfy: BFL/f is more than 0.3 and less than 0.7. Meets BFL/f of 0.2 < 0.8, is beneficial to realizing the requirement of the lens on back focus and is beneficial to enabling the image formed by the lens to be better presented on a chip.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f > 13mm, where f is the total effective focal length of the optical imaging lens. More specifically, f further satisfies: f is more than 18mm. Satisfies f & gt 13mm, and is beneficial to realizing the long focus of the lens.

In an exemplary embodiment, the Semi-FOV may satisfy a Semi-FOV < 11 °; imgH can meet the requirement that ImgH is smaller than 4mm; and TTL may be in the range of 17mm to 20 mm.

In an exemplary embodiment, the total effective focal length f of the optical imaging lens group may be, for example, in the range of 19.00mm to 20.41mm, the effective focal length f1 of the first lens may be, for example, in the range of 9.51mm to 13.95mm, the effective focal length f2 of the second lens may be, for example, in the range of 13.03mm to 62.45mm, the effective focal length f3 of the third lens may be, for example, in the range of-5.90 mm to-4.45 mm, and the effective focal length f4 of the fourth lens may be, for example, in the range of 14.75mm to 27.25 mm.

In an exemplary embodiment, the optical imaging lens according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an optical imaging lens with characteristics of miniaturization, long focus, high imaging quality and the like. The optical imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the above four lenses. Through reasonable distribution, focal power, surface shape, central thickness and axial spacing between lenses, the optical imaging lens can effectively collect incident light, reduce optical total length and improve processability.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, 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 aspherical mirror. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, and the fourth lens is an aspherical mirror surface. Optionally, 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 are aspherical mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although four lenses are described as an example in the embodiment, the optical imaging lens is not limited to include seven lenses. The optical imaging lens may also include other numbers of lenses, if desired.

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

Example 1

An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.

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

TABLE 1

In this example, the total effective focal length f of the optical imaging lens is 20.41mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis is 18.86mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half of the maximum field angle Semi-FOV of the optical imaging lens is 9.87 °, and the aperture value Fno of the optical imaging lens is 4.49.

In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1-S8 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 。

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

0.0000E+00

S2

0.0000E+00

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

0.0000E+00

S8

0.0000E+00

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 2B shows an astigmatism curve of the optical imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 2D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens provided in embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis is 18.00mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half of the maximum field angle Semi-FOV of the optical imaging lens is 10.71 °, and the aperture value Fno of the optical imaging lens is 4.52.

Table 3 shows the basic parameter table of the optical imaging lens of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 3 Table 3

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-4.3572E-03

-4.4987E-04

1.4918E-04

-1.4122E-05

4.4333E-06

-4.3012E-06

-2.6467E-07

-8.3269E-07

-1.4586E-06

S2

1.1733E-03

3.7534E-04

2.3076E-04

-8.7168E-05

3.4610E-05

-1.4554E-05

5.6530E-06

-1.6177E-06

2.2867E-07

S3

8.8864E-03

5.3433E-03

1.0889E-03

-3.3175E-04

1.6905E-04

-6.3297E-05

2.5196E-05

-9.3622E-06

6.2044E-07

S4

-7.5931E-03

7.6988E-04

3.3833E-03

-6.3267E-04

7.6476E-04

-3.1059E-04

4.1059E-05

-9.4647E-05

3.7603E-06

S5

-3.3346E-03

-3.9152E-03

1.2175E-03

-5.6571E-04

2.6527E-04

-9.9532E-05

4.2757E-05

-1.0309E-05

7.5997E-07

S6

-1.3006E-02

-1.3085E-03

1.9919E-04

-6.6755E-05

3.8773E-05

-1.7465E-05

8.2743E-06

-3.4486E-06

5.8468E-07

S7

1.1505E-03

4.2513E-03

6.1565E-04

-2.9831E-04

-1.2707E-04

6.7745E-05

1.1581E-04

5.5087E-05

-5.1081E-06

S8

1.3292E-02

1.1083E-03

3.5780E-04

8.1644E-05

9.8658E-05

5.1162E-05

6.2636E-05

4.1622E-05

3.3207E-05

TABLE 4 Table 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 4B shows an astigmatism curve of the optical imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens provided in embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural diagram of an optical imaging lens according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis is 17.98mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half of the maximum field angle Semi-FOV of the optical imaging lens is 10.79 °, and the aperture value Fno of the optical imaging lens is 4.52.

Table 5 shows the basic parameter table of the optical imaging lens of embodiment 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 5

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.6564E-04

2.9102E-05

-2.1104E-05

1.4154E-05

-4.3751E-06

4.9498E-06

-4.6245E-06

-8.2593E+01

5.5066E+01

S2

1.8315E-03

1.9014E-04

8.0186E-05

-2.3574E-05

6.8630E-06

-4.5776E-06

3.2648E-06

-6.2966E-07

-5.9926E-08

S3

-8.4752E-05

1.8701E-05

-4.5938E-05

-1.4192E-06

-2.1568E-05

-6.5080E-06

-4.7521E-06

-9.6712E-06

-1.9017E-05

S4

2.5972E-03

-3.7529E-03

-2.6400E-04

7.1772E-05

-6.1292E-05

-2.2193E-05

-2.9625E-05

-1.2680E-05

-7.8785E-06

S5

9.8184E-04

-1.1517E-02

1.0613E-03

-3.6373E-05

6.5765E-06

2.1662E-05

2.7564E-05

2.5317E-05

1.4617E-05

S6

-1.4306E-04

-6.0083E-03

4.7315E-04

5.3320E-06

1.6534E-05

4.5389E-06

3.3037E-06

-1.3550E-06

3.0260E-06

S7

-1.4188E-03

3.6527E-05

1.2736E-04

-9.8248E-05

2.3609E-05

-4.4026E-06

1.1924E-05

-1.9396E-05

-2.3502E-05

S8

1.1851E-03

-1.5134E-04

-3.6621E-05

5.8869E-05

-4.0188E-05

2.4900E-05

-2.1753E-05

-5.2264E-07

-4.0759E-05

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the optical imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. Fig. 6D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens provided in embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis is 17.99mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half of the maximum field angle Semi-FOV of the optical imaging lens is 10.78 °, and the aperture value Fno of the optical imaging lens is 4.52.

Table 7 shows a basic parameter table of the optical imaging lens of example 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 7

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.6519E-03

1.5100E-04

-1.3882E-04

-1.3677E-05

6.2389E-06

-1.2859E-06

-1.2824E-06

4.4953E-07

1.8946E-08

S2

6.2908E-03

3.3165E-05

-2.0676E-04

3.4743E-06

6.4866E-06

9.0491E-07

-2.4949E-06

4.2871E-07

8.7950E-08

S3

1.6987E+04

-3.3967E+03

1.1325E+03

-4.8497E+02

2.4267E+02

-1.3482E+02

8.0891E+01

-5.1476E+01

3.4318E+01

S4

1.2077E-02

8.4659E-05

4.8390E-04

-4.2947E-05

3.9424E-06

1.0137E-05

1.6886E-06

1.1660E-06

1.3442E-07

S5

1.6804E-03

-1.6317E-02

9.2430E-04

5.3630E-04

1.2482E-03

6.4136E-04

3.0261E-04

9.4251E-05

2.4342E-05

S6

-6.0119E-04

-6.6105E-03

1.0312E-03

-4.1359E-04

-2.6996E-05

-1.1285E-04

-5.4362E-05

-2.7426E-05

-2.6872E-06

S7

9.2656E+02

2.9300E+00

2.9301E+00

9.2656E+02

S8

8.3944E+03

-1.6790E+03

5.5972E+02

-2.3991E+02

1.1997E+02

-6.6661E+01

4.0004E+01

-2.5462E+01

1.6979E+01

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the optical imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. Fig. 8D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the optical imaging lens provided in embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 19.03mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis is 17.99mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half of the maximum field angle Semi-FOV of the optical imaging lens is 10.70 °, and the aperture value Fno of the optical imaging lens is 4.49.

Table 9 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 9

Table 10

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve of the optical imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. Fig. 10D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens provided in embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural diagram of an optical imaging lens according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 11

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-4.3572E-03

-4.4987E-04

1.4918E-04

-1.4122E-05

4.4333E-06

-4.3012E-06

-2.6467E-07

-8.3269E-07

-1.4586E-06

S2

1.1733E-03

3.7534E-04

2.3076E-04

-8.7168E-05

3.4610E-05

-1.4554E-05

5.6530E-06

-1.6177E-06

2.2867E-07

S3

8.8864E-03

5.3433E-03

1.0889E-03

-3.3175E-04

1.6905E-04

-6.3297E-05

2.5196E-05

-9.3622E-06

6.2044E-07

S4

-7.5931E-03

7.6988E-04

3.3833E-03

-6.3267E-04

7.6476E-04

-3.1059E-04

4.1059E-05

-9.4647E-05

3.7603E-06

S5

-3.3346E-03

-3.9152E-03

1.2175E-03

-5.6571E-04

2.6527E-04

-9.9532E-05

4.2757E-05

-1.0309E-05

7.5997E-07

S6

-1.3006E-02

-1.3085E-03

1.9919E-04

-6.6755E-05

3.8773E-05

-1.7465E-05

8.2743E-06

-3.4486E-06

5.8468E-07

S7

1.1505E-03

4.2513E-03

6.1565E-04

-2.9831E-04

-1.2707E-04

6.7745E-05

1.1581E-04

5.5087E-05

-5.1081E-06

S8

1.3292E-02

1.1083E-03

3.5780E-04

8.1644E-05

9.8658E-05

5.1162E-05

6.2636E-05

4.1622E-05

3.3207E-05

Table 12

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the optical imaging lens of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens provided in embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic structural diagram of an optical imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens sequentially includes, from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, an optical filter E5, and an imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens on the optical axis is 18.00mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half of the maximum field angle Semi-FOV of the optical imaging lens is 10.68 °, and the aperture value Fno of the optical imaging lens is 4.49.

Table 13 shows a basic parameter table of the optical imaging lens of embodiment 7, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 13

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.2985E-02

-3.2290E-05

4.5340E-04

1.4656E-04

1.4700E-05

-7.6948E-06

-3.5600E-06

-6.2772E-07

-4.3409E-08

S2

1.5610E-03

1.0389E-03

4.9664E-04

9.9338E-05

-4.1588E-07

-5.5321E-06

-1.4901E-06

-1.8942E-07

-1.0176E-08

S3

6.4451E-03

2.5420E-03

7.2590E-04

1.5856E-04

2.3029E-05

1.3274E-06

-2.1363E-07

-5.0434E-08

-3.3208E-09

S4

3.6900E-03

8.2405E-04

2.0515E-04

4.3255E-05

8.1584E-06

1.5467E-06

2.5476E-07

2.8257E-08

1.4841E-09

S5

1.8999E-03

-1.8141E-03

-4.5017E-04

-5.5069E-05

1.4179E-06

1.7647E-06

3.0221E-07

2.3461E-08

6.6824E-10

S6

-6.3040E-03

-9.0162E-04

-2.7256E-04

-2.3137E-05

4.8065E-06

2.2633E-06

4.5718E-07

5.1888E-08

2.6525E-09

S7

2.0586E-02

2.4529E-03

8.2972E-05

-1.8217E-05

3.9661E-06

2.3929E-06

4.1204E-07

3.0635E-08

6.5621E-10

S8

2.1751E-02

1.7756E-03

-3.3705E-06

-5.0773E-05

-1.2126E-05

-7.6899E-07

2.2692E-07

5.4836E-08

3.8849E-09

TABLE 14

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the optical imaging lens of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging lens provided in embodiment 7 can achieve good imaging quality.

In summary, examples 1 to 7 each satisfy the relationship shown in table 15.

TABLE 15

The present application also provides an imaging device, the electron-sensitive element of which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the optical imaging lens described above.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. The optical imaging lens is characterized by sequentially comprising, from an object side to an image side along an optical axis:

a first lens with positive focal power, the object side surface of which is a convex surface;

a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface;

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

a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;

the entrance pupil diameter EPD of the optical imaging lens, the total effective focal length f of the optical imaging lens, and the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis satisfy: f/EPD is more than 4 and less than or equal to 4.52, and TTL/f is more than or equal to 0.92 and less than or equal to 1;

The number of lenses having optical power in the optical imaging lens is four.

2. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 1.89.ltoreq.T34/(T12+T23). Ltoreq.5.02, wherein T12 is the air space of the first lens and the second lens on the optical axis, T23 is the air space of the second lens and the third lens on the optical axis, and T34 is the air space of the third lens and the fourth lens on the optical axis.

3. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 0 < f12/f < 1, wherein f12 is the combined focal length of the first lens and the second lens.

4. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: CT2/CT3 < 3, wherein CT3 is the center thickness of the third lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

5. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 1.6 < f1/EPD < 4, wherein EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens.

6. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 0 < (r1+r3+r6)/(f1+f2+f3) < 1.2, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R1 is the radius of curvature of the object side of the first lens, R3 is the radius of curvature of the object side of the second lens, and R6 is the radius of curvature of the image side of the third lens.

7. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image side of the third lens.

8. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 0.86.ltoreq.DT 31/DT21 < 1, where DT21 is the effective radius of the object side of the second lens and DT31 is the effective radius of the object side of the third lens.

9. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: ET3/CT3 is equal to or greater than ETn/CTn, wherein ET3 is the edge thickness of the third lens, CT3 is the center thickness of the third lens on the optical axis, ETn is the edge thickness of any one of the first lens, the second lens and the fourth lens, and CTn is the center thickness of any one of the first lens, the second lens and the fourth lens on the optical axis.

10. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 1.4 < (N1+N2+N3+N4)/4 < 1.8, wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens.

11. The optical imaging lens of any of claims 1-10, wherein the optical imaging lens comprises a stop between the first lens and the second lens,

the optical imaging lens satisfies the following conditions: 0.8 < SL/TTL < 1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis.

12. The optical imaging lens of any of claims 1-10, wherein the optical imaging lens satisfies: 3mm < Tan (Semi-FOV). Times.f.ltoreq.3.62 mm, wherein the Semi-FOV is half of the maximum field angle of the optical imaging lens.

13. The optical imaging lens of any of claims 1-10, wherein the optical imaging lens satisfies: 0.2 < BFL/f < 0.8, wherein BFL is the distance on the optical axis from the image side of the fourth lens to the imaging surface of the optical imaging lens.

14. The optical imaging lens of any of claims 1-10, further comprising a prism located between the object side and the first lens, the prism reflecting light incident to the prism in an incident direction as exiting the prism in the optical axis direction.