CN113093368A

CN113093368A - Optical imaging lens

Info

Publication number: CN113093368A
Application number: CN202110393928.0A
Authority: CN
Inventors: 高劲柏; 宋立通; 金银芳; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-07-09
Anticipated expiration: 2041-04-13
Also published as: CN113093368B; CN115220192A

Abstract

The application discloses optical imaging lens includes following preface from object side to image side along optical axis: the image side surface of the first lens is a convex surface; a second lens having an optical power; a third lens having optical power; and a fourth lens having a negative optical power. The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: f/EPD < 1.4.

Description

Optical imaging lens

Technical Field

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

Background

With the development of science and technology, nowadays, competition among digital products of various manufacturers is increasingly intense, and particularly in the aspect of cameras, lenses with different functions are continuously integrated, so that the use experience of consumers is improved, and the competitiveness of the products is enhanced. Among them, the TOF (Time-of-Flight) shot has its own unique advantages, and has an orderly increase in market share, showing excellent potential.

The TOF lens transmits and receives infrared pulses, and inversion is carried out by using the obtained time difference or phase difference, so that the environmental depth information is reproduced. TOF lenses have significant advantages over structured light paths in terms of computation time and effective depth. If this technique combines together with big light ring, will have faster speed of shooing under the equal illumination condition to outstanding formation of image main part in the depth scanning promotes like the matter in coordination, occupies more important position in fields such as unmanned driving, AR modeling, medical treatment control and gesture recognition.

Disclosure of Invention

An aspect of the present disclosure provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: the image side surface of the first lens is a convex surface; a second lens having an optical power; a third lens having optical power; and a fourth lens having a negative optical power. The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens can satisfy the following conditions: f/EPD < 1.4.

In one embodiment, the distance TTL along the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens, and the effective focal length f1 of the first lens may satisfy: TTL/ImgH + f/f1 is more than 2.0 and less than 3.0.

In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the effective focal length f2 of the second lens satisfy: -2.0 < R4/f2 < -0.5.

In one embodiment, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy: -1.3 < f3/f4 < -0.3.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: 0.5 < R1/R2 < 1.0.

In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the 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 may satisfy: -1.5 < (R7+ R8)/(R5+ R6) < -0.5.

In one embodiment, the central thickness CT2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 0.5 < CT2/(CT1+ CT3+ CT4) < 1.1.

In one embodiment, a sum Σ AT of a separation distance T23 of the second lens and the third lens on the optical axis and a separation distance on the optical axis of any adjacent two lenses of the first lens to the fourth lens may satisfy: 0.5 < T23/Σ AT < 1.0.

In one embodiment, the maximum effective radius DT22 of the image-side surface of the second lens and the maximum effective radius DT11 of the object-side surface of the first lens may satisfy: 0.5 < DT22/DT11 < 1.0.

In one embodiment, the operating wavelength band of the optical imaging lens may be 900nm to 1000 nm.

In one embodiment, the edge thickness ET2 of the second lens, the edge thickness ET1 of the first lens, and the edge thickness ET4 of the fourth lens may satisfy: 0.3 < ET2/(ET1+ ET4) < 0.8.

In one embodiment, an on-axis distance SAG11 from an intersection point of an 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, an on-axis distance SAG31 from an intersection point of an object-side surface of the third lens and the optical axis to an effective radius vertex of an object-side surface of the third lens, an on-axis distance SAG22 from an intersection point of an image-side surface of the second lens and the optical axis to an effective radius vertex of an image-side surface of the second lens, and an on-axis distance SAG32 from an intersection point of an image-side surface of the third lens and the optical axis to an effective radius vertex of an image-side surface of the third lens may satisfy: 0.3 < (SAG11+ SAG31)/(SAG22+ SAG32) < 1.0.

In one embodiment, the edge thickness ET3 of the third lens and the maximum effective radius DT31 of the object side surface of the third lens may satisfy: 0 < ET3/DT31 < 0.5.

In one embodiment, the second lens may have a positive optical power, and the image side surface thereof may be convex.

Another aspect of the present disclosure provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: the image side surface of the first lens is a convex surface; a second lens having an optical power; a third lens having optical power; and a fourth lens having a negative optical power. The central thickness CT2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 0.5 < CT2/(CT1+ CT3+ CT4) < 1.1.

In one embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: f/EPD < 1.4.

The four-piece type lens framework is adopted, and an effective implementation way is provided for the large-aperture TOF lens through reasonable distribution of focal power and optimal selection of surface type and thickness. The optical imaging lens has at least one beneficial effect of higher photographing speed under the same illumination condition, projecting an imaging main body in depth scanning, cooperatively improving the image quality and the like.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic structural view of an optical imaging lens according to embodiment 1 of the present application;

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

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

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

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

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

fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application;

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

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

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

fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;

fig. 12A to 12E show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging lens of embodiment 6.

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

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

Detailed Description

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

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 application.

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. In this document, the surface of each lens closest to the subject is referred to as the object-side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image-side surface of the lens.

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

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

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

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

An optical imaging lens according to an exemplary embodiment of the present application may include, for example, four lenses having optical powers, i.e., a first lens, a second lens, a third lens, and a fourth lens. The four lenses are arranged in sequence from the object side to the image side along the optical axis.

In an exemplary embodiment, the first lens may have a negative power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a negative optical power.

In an exemplary embodiment, the image side surface of the first lens may be convex.

By reasonably designing the focal power and the surface type of the first lens, the structure of the lens can be ensured to have good machinability, the total length of the lens can be regulated and controlled, and the imaging system has the advantage of large field angle; by reasonably matching the focal power of the second lens and the third lens, the off-axis aberration of the optical lens can be corrected, and the imaging quality is improved; by reasonably matching the focal power and the surface type of the fourth lens, the processability of the fourth lens can be ensured, the chromatic aberration of the optical system can be reduced, and the imaging quality of the optical system can be improved.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression f/EPD < 1.4, where f is an effective focal length of the optical imaging lens and EPD is an entrance pupil diameter of the optical imaging lens. By controlling the ratio of the effective focal length of the optical imaging lens to the entrance pupil diameter of the optical imaging lens, namely, the f-number is in the range, the imaging speed and the image surface illumination of the lens can be improved, and the depth of field information is highlighted.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 2.0 < TTL/ImgH + f/f1 < 3.0, where TTL is a distance along an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging lens, ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens, f is an effective focal length of the optical imaging lens, and f1 is an effective focal length of the first lens. The distance from the object side surface of the first lens to the imaging surface of the optical imaging lens along the optical axis, half of the diagonal length of an effective pixel area on the imaging surface of the optical imaging lens, and the effective focal length of the optical imaging lens and the effective focal length of the first lens meet the condition that TTL/ImgH + f/f1 is more than 2.0 and less than 3.0, so that the large field of view of an object space can be shared, the imaging quality of the lens is ensured, the system length is reduced as far as possible, and the applicable range of the lens is increased. More specifically, TTL, ImgH, f, and f1 can satisfy 2.3 < TTL/ImgH + f/f1 < 2.8.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression-2.0 < R4/f2 < -0.5, where R4 is a radius of curvature of an image-side surface of the second lens and f2 is an effective focal length of the second lens. By controlling the ratio of the curvature radius of the image side surface of the second lens to the effective focal length of the second lens in the range, the second lens can be controlled to have good image side surface appearance and low sensitivity, the chromatic aberration on the axis is effectively reduced, and better imaging quality is ensured. More specifically, R4 and f2 may satisfy-1.5 < R4/f2 < -0.5.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression-1.3 < f3/f4 < -0.3, where f3 is an effective focal length of the third lens and f4 is an effective focal length of the fourth lens. By controlling the ratio of the effective focal length of the third lens to the effective focal length of the fourth lens to be in the range, the matching of the main ray angle (CRA) of the lens can be ensured, the curvature of field and the astigmatism can be effectively corrected, and the imaging quality of the optical system is improved. More specifically, f3 and f4 may satisfy-1 < f3/f4 < -0.5.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.5 < R1/R2 < 1.0, where R1 is a radius of curvature of an object-side surface of the first lens and R2 is a radius of curvature of an image-side surface of the first lens. By controlling the ratio of the curvature radius of the object side surface of the first lens to the curvature radius of the image side surface of the first lens to be in the range, the first lens can be ensured to have good lens appearance and machinability, so that the imaging system has the advantage of large field angle and is beneficial to improving the image plane relative illumination. More specifically, R1 and R2 may satisfy 0.6 < R1/R2 < 0.9.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression-1.5 < (R7+ R8)/(R5+ R6) < -0.5, where R7 is a radius of curvature of an object-side surface of the fourth lens, R8 is a radius of curvature of an image-side surface of the fourth lens, R5 is a radius of curvature of an object-side surface of the third lens, and R6 is a radius of curvature of an image-side surface of the third lens. By controlling the ratio of the sum of the curvature radius of the object side surface of the fourth lens and the curvature radius of the image side surface of the fourth lens to the sum of the curvature radius of the object side surface of the third lens and the curvature radius of the image side surface of the third lens to be in the range, the spherical aberration of the system can be eliminated in a matched mode, the off-axis aberration is optimized, and therefore good imaging quality is guaranteed. More specifically, R7, R8, R5 and R6 may satisfy-1.2 < (R7+ R8)/(R5+ R6) < -0.6.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.5 < CT2/(CT1+ CT3+ CT4) < 1.1, where CT2 is a central thickness of the second lens on the optical axis, CT1 is a central thickness of the first lens on the optical axis, CT3 is a central thickness of the third lens on the optical axis, and CT4 is a central thickness of the fourth lens on the optical axis. By controlling the ratio of the central thickness of the second lens on the optical axis to the sum of the central thickness of the first lens on the optical axis, the central thickness of the third lens on the optical axis and the central thickness of the fourth lens on the optical axis within the range, the thickness sensitivity of the lens can be effectively reduced, the curvature of field can be corrected, and the processability of the optical system can be improved.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.5 < T23/Σ AT < 1.0, where T23 is a separation distance of the second lens and the third lens on the optical axis, and Σ AT is a sum of separation distances of any adjacent two lenses of the first lens to the fourth lens on the optical axis. By controlling the ratio of the spacing distance of the second lens and the third lens on the optical axis to the sum of the spacing distances of any two adjacent lenses in the range from the first lens to the fourth lens on the optical axis, the thickness sensitivity of the lens can be effectively reduced, the insertion of structural components such as spacers is facilitated, and the system processing yield is considered. More specifically, T23 and Σ AT may satisfy 0.5 < T23/Σ AT < 0.9.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.5 < DT22/DT11 < 1.0, where DT22 is the maximum effective radius of the image-side surface of the second lens and DT11 is the maximum effective radius of the object-side surface of the first lens. The ratio of the maximum effective radius of the image side surface of the second lens to the maximum effective radius of the object side surface of the first lens is controlled within the range, so that the capacity of the lens for accommodating light can be effectively controlled, and the adaptability of image surface illumination and a chip is improved, so that the power consumption of a system is reduced, and the imaging quality is improved.

In an exemplary embodiment, an optical imaging lens of the present application may have an operating wavelength band between 900nm and 1000 nm.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.3 < ET2/(ET1+ ET4) < 0.8, where ET2 is the edge thickness of the second lens, ET1 is the edge thickness of the first lens, and ET4 is the edge thickness of the fourth lens. By controlling the ratio of the edge thickness of the second lens to the sum of the edge thickness of the first lens and the edge thickness of the fourth lens within the range, the improvement of the edge light convergence capability can be facilitated, the surface smoothness of the lens can be effectively controlled, and the injection molding yield of the lens can be improved. More specifically, ET2, ET1, and ET4 may satisfy 0.4 < ET2/(ET1+ ET4) < 0.7.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.3 < (SAG11+ SAG31)/(SAG22+ SAG32) < 1.0, where SAG11 is an on-axis distance from an intersection of an object-side surface of the first lens and an optical axis to an effective radius vertex of the object-side surface of the first lens, SAG31 is an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, SAG22 is an on-axis distance from an intersection of an image-side surface of the second lens and the optical axis to an effective radius vertex of an image-side surface of the second lens, and SAG32 is an on-axis distance from an intersection of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens. The ratio of the sum of the on-axis distance from the intersection point of the object side surface of the first lens and the optical axis to the effective radius peak of the object side surface of the first lens, the on-axis distance from the intersection point of the object side surface of the third lens and the optical axis to the effective radius peak of the object side surface of the third lens, and the sum of the on-axis distance from the intersection point of the image side surface of the second lens and the optical axis to the effective radius peak of the image side surface of the second lens and the on-axis distance from the intersection point of the image side surface of the third lens and the optical axis to the effective radius peak of the image side surface of the third lens is controlled to be within the range, the spherical aberration and the coma aberration of the system can be controlled and optimized. More specifically, SAG11, SAG31, SAG22 and SAG32 may satisfy 0.3 < (SAG11+ SAG31)/(SAG22+ SAG32) < 0.9.

In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0 < ET3/DT31 < 0.5, 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. 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 the range, the injection molding yield of the third lens can be effectively improved, and the system processability is improved. More specifically, ET3 and DT31 may satisfy 0.2 < ET3/DT31 < 0.5.

In an exemplary embodiment, the second lens may have a positive optical power, and the image side surface thereof may be convex. By reasonably configuring the focal power and the image side surface appearance of the second lens, the light gathering degree can be optimized, the sensitivity of the second lens is reduced, and the yield of finished products is improved.

In an exemplary embodiment, the optical imaging lens may further include at least one diaphragm. The diaphragm may be disposed at an appropriate position as needed, for example, between the first lens and the second lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, four lenses as described above. 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, the optical imaging lens can be effectively ensured to have the characteristics of higher photographing speed under the same illumination condition, projection of an imaging main body in depth scanning, cooperative improvement of image quality and the like.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror, that is, at least one of the object-side surface of the first lens and the image-side surface of the fourth lens is an aspherical mirror. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, 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, second, third, and fourth lenses has an object-side surface and an image-side surface that 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. The optical imaging lens may also include other numbers of lenses, if desired.

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

Example 1

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

As shown in fig. 1, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex 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 optical imaging lens has an imaging surface S11, and light from the object passes through the respective surfaces S1 to S10 in order and is finally imaged on the imaging surface S11.

Table 1 shows basic parameters of the optical imaging lens of embodiment 1, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm).

TABLE 1

In embodiment 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 surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein the content of the first and second substances,x is the distance rise from 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 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The high-order term coefficients A usable for the aspherical mirror surfaces S1 to S8 in example 1 are shown in Table 2-1 and Table 2-2 below₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂And A₂₄。

TABLE 2-1

Flour mark	A16	A18	A20	A22	A24
						S1	-8.3046E-04	-3.3309E-04	-4.6805E-05	4.2909E-05	3.5460E-05
S2	-5.6762E-04	8.2068E-05	1.7229E-04	1.8277E-04	6.3802E-05
						S3	-2.0718E-05	1.5337E-05	1.4560E-05	4.9961E-06	-1.3146E-05
S4	2.3535E-05	1.9643E-05	6.1538E-05	1.2833E-05	2.9222E-05
						S5	7.6105E-05	1.4738E-05	-3.3277E-05	6.0256E-06	-1.8872E-05
S6	4.9500E-04	-1.7528E-04	1.2139E-04	-4.2515E-05	7.5102E-06
						S7	-2.2325E-04	-4.6885E-04	-4.0906E-06	-6.0972E-05	-2.1628E-05
S8	1.2883E-03	-5.5510E-04	5.9196E-04	-3.9458E-05	2.9026E-04

Tables 2 to 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the convergent focus deviation 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 angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. Fig. 2E shows a relative illuminance curve of the optical imaging lens of embodiment 1, which represents the relative illuminance at different image heights. As can be seen from fig. 2A to 2E, the optical imaging lens according to 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 4E. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of 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, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

Table 3 shows basic parameters of the optical imaging lens of embodiment 2, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 4-1 and 4-2 show the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 through S8 in example 2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 3

Flour mark	A4	A6	A8	A10	A12
						S1	7.7760E-01	-3.3611E-02	9.8388E-03	3.2578E-05	2.4305E-04
S2	3.1431E-01	2.4703E-04	1.6365E-03	-2.9684E-04	-5.6413E-05
						S3	-1.7096E-03	-6.0470E-03	-4.5979E-04	-1.3427E-04	-2.3915E-05
S4	-4.4377E-02	-7.6576E-03	-1.0133E-03	-2.1131E-04	-3.0597E-05
						S5	1.5674E-01	2.4566E-02	8.0328E-03	-1.2892E-03	4.4245E-04
S6	2.1223E-01	4.2333E-02	1.0152E-02	-4.2571E-04	-1.0027E-04
						S7	-1.6348E+00	9.1920E-02	-7.2303E-02	1.0143E-02	-8.6858E-03
S8	-7.5062E-01	4.5803E-02	-3.8192E-02	9.6552E-03	-2.5377E-03

TABLE 4-1

Flour mark	A14	A16	A18	A20
					S1	4.3339E-05	1.0053E-05	6.2488E-06	5.0373E-06
S2	-7.6912E-05	-9.8337E-06	-1.4744E-05	7.0636E-06
					S3	-6.3180E-06	6.6953E-08	1.9967E-06	-1.7683E-06
S4	-7.7212E-06	-3.9384E-06	-5.0428E-06	-3.5414E-06
					S5	5.3786E-05	6.2664E-05	-8.9233E-06	9.0439E-06
S6	2.1724E-04	7.9679E-05	-7.3212E-06	8.5138E-06
					S7	3.7930E-04	-1.6555E-03	-5.0265E-05	-2.4596E-04
S8	1.9917E-03	-1.6495E-04	3.5183E-04	1.8355E-05

TABLE 4-2

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and 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 angles of view. 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 plane after light passes through the lens. Fig. 4E shows a relative illuminance curve of the optical imaging lens of embodiment 2, which represents the relative illuminance at different image heights. As can be seen from fig. 4A to 4E, the optical imaging lens according to 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 6E. 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, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

Table 5 shows basic parameters of the optical imaging lens of embodiment 3, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 6-1 and 6-2 show the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S8 in example 3₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 5

Flour mark	A4	A6	A8	A10	A12
						S1	1.1196E+00	-8.0679E-02	1.7617E-02	-1.9936E-03	3.5480E-04
S2	3.2610E-01	3.1144E-02	-8.8386E-03	3.2060E-03	-2.2961E-03
						S3	-2.8287E-03	-1.1088E-02	1.1316E-04	-3.4040E-04	1.1172E-05
S4	-8.6364E-02	-1.0994E-02	-6.5010E-04	5.1541E-04	6.6429E-04
						S5	2.5448E-01	1.4218E-02	-1.4373E-02	-1.1683E-02	-5.1342E-03
S6	4.5896E-01	2.5785E-02	2.3186E-02	-6.6035E-03	2.3682E-03
						S7	-5.1866E-01	3.5186E-02	-1.0802E-02	1.9125E-03	-4.3798E-04
S8	-4.0667E-01	1.3736E-02	-1.5637E-02	2.6008E-03	-1.5967E-03

TABLE 6-1

TABLE 6-2

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and 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 angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. Fig. 6E shows a relative illuminance curve of the optical imaging lens of embodiment 3, which represents the relative illuminance at different image heights. As can be seen from fig. 6A to 6E, the optical imaging lens according to 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 8E. 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, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

Table 7 shows basic parameters of the optical imaging lens of embodiment 4, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S8 in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 7

TABLE 8-1

Flour mark	A14	A16	A18	A20
					S1	3.1056E-04	4.5018E-04	1.8522E-04	3.8161E-05
S2	-4.3872E-03	-2.9070E-03	-8.5340E-04	-2.5803E-04
					S3	-1.7545E-04	-4.7679E-05	-4.1791E-05	-8.1751E-06
S4	-6.9155E-06	-1.2201E-05	3.1541E-06	0.0000E+00
					S5	-1.5599E-04	3.9054E-05	8.3424E-07	-1.3539E-06
S6	-8.3532E-06	-1.1751E-05	9.0110E-06	-8.7598E-07
					S7	2.5784E-04	-3.7078E-04	4.6967E-05	-5.8712E-05
S8	1.2243E-04	-1.7459E-04	8.4979E-05	-3.6289E-05

TABLE 8-2

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and 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 angles of view. 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 light passes through the lens. Fig. 8E shows a relative illuminance curve of the optical imaging lens of embodiment 4, which represents the relative illuminance at different image heights. As can be seen from fig. 8A to 8E, the optical imaging lens according to 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 10E. 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, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

Table 9 shows basic parameters of the optical imaging lens of embodiment 5, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 10-1 and 10-2 show the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S8 in example 5₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 9

Flour mark	A4	A6	A8	A10	A12
						S1	6.7777E-01	-4.3571E-02	9.6489E-03	-9.0475E-04	2.1414E-04
S2	1.8629E-01	1.4035E-05	1.3109E-05	2.0049E-04	3.1952E-06
						S3	1.3039E-02	-6.2799E-03	4.7370E-04	-1.4045E-04	1.9522E-05
S4	-4.1978E-02	-4.7928E-03	-1.0030E-03	-4.1055E-04	-9.2095E-05
						S5	1.4054E-01	2.8220E-03	1.5348E-03	-2.0252E-03	4.0633E-04
S6	2.3997E-01	1.1849E-02	6.0886E-03	-2.3707E-03	2.0971E-04
						S7	-1.0441E+00	5.3203E-02	-3.4303E-02	3.7149E-03	-2.9377E-03
S8	-4.6382E-01	1.3069E-02	-1.8554E-02	1.4896E-03	-1.9562E-03

TABLE 10-1

Flour mark	A14	A16	A18	A20
					S1	-2.3680E-05	9.9839E-06	-2.4859E-06	1.0438E-06
S2	-1.4094E-05	9.7407E-06	-4.5648E-06	3.2119E-07
					S3	-7.7879E-06	5.3312E-06	-2.2740E-06	2.3912E-07
S4	-5.8899E-05	-3.7655E-05	-3.7259E-05	0.0000E+00
					S5	-1.3009E-06	-6.3610E-06	-5.1152E-06	1.9361E-06
S6	-8.9078E-06	4.0270E-05	-1.3330E-05	-1.5080E-07
					S7	3.7483E-04	-3.4165E-04	1.0747E-04	-6.0190E-05
S8	2.0018E-04	-3.0099E-04	1.5333E-04	-9.2671E-05

TABLE 10-2

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and 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 angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. Fig. 10E shows a relative illuminance curve of the optical imaging lens of example 5, which represents the relative illuminance at different image heights. As can be seen from fig. 10A to 10E, the optical imaging lens according to 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 12E. Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

Table 11 shows basic parameters of the optical imaging lens of embodiment 6, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 12-1 and 12-2 show the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S8 in example 6₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 11

Flour mark	A4	A6	A8	A10	A12
						S1	1.7434E+00	-9.3684E-02	4.2813E-02	-3.9868E-03	-2.4023E-04
S2	3.4226E-01	1.0556E-02	-1.5926E-02	1.5032E-03	-4.4495E-03
						S3	-8.7226E-04	-1.4941E-02	1.0456E-03	-4.8924E-04	6.9756E-05
S4	8.1955E-02	-1.5516E-02	3.1930E-03	-8.0588E-04	-8.9026E-05
						S5	2.8740E-01	1.1302E-02	4.0289E-03	-2.6796E-03	8.0594E-04
S6	5.1351E-01	-8.7011E-03	2.8378E-02	-4.9394E-03	3.3634E-03
						S7	-9.2970E-01	-6.0862E-03	-2.9231E-02	-4.4375E-03	-2.7610E-03
S8	-5.9676E-01	-2.3525E-02	-2.0827E-02	-5.0748E-03	-8.2113E-04

TABLE 12-1

TABLE 12-2

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and 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 angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging surface after light passes through the lens. Fig. 12E shows a relative illuminance curve of the optical imaging lens of example 6, which represents the relative illuminance at different image heights. As can be seen from fig. 12A to 12E, the optical imaging lens according to 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 14E. Fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, and a filter E5.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex 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 optical imaging lens has an imaging surface S11, and light from the object passes through the respective surfaces S1 to S10 in order and is finally imaged on the imaging surface S11.

Table 13 shows basic parameters of the optical imaging lens of embodiment 7, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 14-1 and 14-2 show the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S8 in example 7₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.

Watch 13

Flour mark	A4	A6	A8	A10	A12
						S1	4.1934E-01	-4.0847E-02	6.7103E-03	-9.1573E-04	4.9389E-06
S2	1.7409E-01	-6.4740E-03	2.4708E-03	3.2343E-04	7.2849E-05
						S3	5.9973E-02	-2.5957E-02	3.7428E-03	-1.4406E-03	2.7196E-04
S4	-7.0790E-02	-1.0318E-02	-1.7661E-03	-4.0165E-04	-9.4060E-05
						S5	3.0678E-01	1.0853E-02	7.3248E-03	-1.1479E-03	4.4013E-04
S6	4.3254E-01	-2.8156E-02	1.5248E-02	-2.5920E-03	1.1738E-03
						S7	-7.7175E-01	2.8751E-02	-1.6492E-02	5.3274E-04	-7.3551E-04
S8	-6.2173E-01	5.2126E-02	-2.2939E-02	6.8656E-03	-2.1804E-03

TABLE 14-1

Flour mark	A14	A16	A18	A20
					S1	8.0847E-05	-6.5739E-05	3.0393E-05	-7.6472E-06
S2	7.8737E-05	8.0214E-06	8.6281E-06	0.0000E+00
					S3	-1.0324E-04	2.6629E-05	-5.8717E-06	1.1143E-06
S4	-1.9361E-05	-1.0727E-06	-3.7143E-06	0.0000E+00
					S5	-9.8987E-05	4.2704E-05	1.4016E-06	-5.6023E-07
S6	-2.6458E-04	1.1712E-04	-1.8135E-05	1.2273E-05
					S7	6.0697E-05	-2.0468E-05	5.0346E-05	1.2502E-05
S8	9.4959E-04	-3.5231E-04	1.7104E-04	-3.9414E-05

TABLE 14-2

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the convergent focus deviation 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 angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. Fig. 14E shows a relative illuminance curve of the optical imaging lens of example 7, which represents the relative illuminance at different image heights. As can be seen from fig. 14A to 14E, the optical imaging lens according to embodiment 7 can achieve good imaging quality.

Further, in embodiments 1 to 7, the focal length values f1 to f4 of the respective lenses, the effective focal length f of the optical imaging lens, the distance TTL along the optical axis from the object side surface of the first lens of the optical imaging lens to the imaging surface of the optical imaging lens, half the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging lens, half the Semi-FOV of the maximum field angle of the optical imaging lens, and the ratio f/EPD of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens, that is, the f-number of the optical imaging lens are as shown in table 15.

Parameters/embodiments	1	2	3	4	5	6	7
								f1(mm)	-26.28	-14.02	-19.30	-9.06	-10.99	-35.19	-59.73
f2(mm)	3.14	2.58	2.73	2.49	2.65	3.07	3.12
								f3(mm)	2.76	4.57	2.53	6.17	4.02	2.73	2.67
f4(mm)	-3.23	-6.56	-2.90	-10.24	-5.56	-3.11	-2.80
								f(mm)	2.39	2.23	2.27	2.20	2.30	2.43	2.37
TTL(mm)	5.64	5.25	5.23	5.34	5.22	5.53	5.47
								ImgH(mm)	2.00	2.00	2.00	2.00	2.00	2.00	2.00
Semi-FOV(°)	43.5	43.5	45.0	47.9	42.4	41.9	46.2
								f/EPD	1.15	1.32	1.23	1.28	1.33	1.33	1.34

Table 15 each of the conditional expressions in example 1 to example 7 satisfies the condition shown in table 16.

Conditions/examples	1	2	3	4	5	6	7
								TTL/ImgH+f/f1	2.73	2.47	2.50	2.43	2.40	2.70	2.70
R4/f2	-0.85	-1.45	-1.19	-0.85	-1.23	-0.87	-0.58
								f3/f4	-0.85	-0.70	-0.88	-0.60	-0.72	-0.88	-0.95
R1/R2	0.82	0.67	0.78	0.64	0.66	0.83	0.86
								(R7+R8)/(R5+R6)	-0.71	-0.94	-1.11	-1.06	-1.05	-0.85	-0.77
CT2/(CT1+CT3+CT4)	0.88	0.60	0.85	1.05	0.75	0.92	0.76
								T23/ΣAT	0.62	0.54	0.57	0.79	0.68	0.66	0.87
DT22/DT11	0.76	0.60	0.64	0.89	0.69	0.79	0.96
								ET2/(ET1+ET4)	0.69	0.41	0.67	0.56	0.50	0.62	0.51
(SAG11+SAG31)/(SAG22+SAG32)	0.50	0.80	0.84	0.64	0.89	0.73	0.32
								ET3/DT31	0.33	0.47	0.43	0.24	0.37	0.37	0.27

TABLE 16

The present application also provides an imaging Device, which is provided with an electron sensing element to form an image, wherein the electron sensing element may be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

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

Claims

1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

the image side surface of the first lens is a convex surface;

a second lens having an optical power;

a third lens having optical power; and

a fourth lens having a negative optical power,

the optical imaging lens satisfies:

f/EPD＜1.4，

where f is the effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens.

2. The optical imaging lens of claim 1, wherein a distance TTL along an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, ImgH which is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens, an effective focal length f of the optical imaging lens and an effective focal length f1 of the first lens element satisfy:

2.0＜TTL/ImgH+f/f1＜3.0。

3. the optical imaging lens of claim 1, wherein the radius of curvature R4 of the image side surface of the second lens and the effective focal length f2 of the second lens satisfy:

-2.0＜R4/f2＜-0.5。

4. the optical imaging lens of claim 1, wherein the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy:

-1.3＜f3/f4＜-0.3。

5. the optical imaging lens of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy:

0.5＜R1/R2＜1.0。

6. the optical imaging lens of claim 1, wherein the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the 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:

-1.5＜(R7+R8)/(R5+R6)＜-0.5。

7. the optical imaging lens according to claim 1, wherein a central thickness CT2 of the second lens on an optical axis, a central thickness CT1 of the first lens on an optical axis, a central thickness CT3 of the third lens on an optical axis, and a central thickness CT4 of the fourth lens on an optical axis satisfy:

0.5＜CT2/(CT1+CT3+CT4)＜1.1。

8. the optical imaging lens according to any one of claims 1 to 7, wherein a sum Σ AT of a separation distance T23 on an optical axis of the second lens and the third lens and a separation distance on an optical axis of any adjacent two lenses of the first lens to the fourth lens satisfies:

0.5＜T23/ΣAT＜1.0。

9. the optical imaging lens according to any one of claims 1 to 7, wherein a maximum effective radius DT22 of an image side surface of the second lens and a maximum effective radius DT11 of an object side surface of the first lens satisfy:

0.5＜DT22/DT11＜1.0。

10. the optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

the image side surface of the first lens is a convex surface;

a second lens having an optical power;

a third lens having optical power; and

a fourth lens having a negative optical power,

the optical imaging lens satisfies:

0.5＜CT2/(CT1+CT3+CT4)＜1.1，

wherein CT2 is a central thickness of the second lens on an optical axis, CT1 is a central thickness of the first lens on an optical axis, CT3 is a central thickness of the third lens on an optical axis, and CT4 is a central thickness of the fourth lens on an optical axis.