CN113625433A - Optical imaging lens - Google Patents

Abstract

The invention provides an optical imaging lens. The imaging lens sequentially comprises from the object side to the image side of the imaging lens: the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, 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; a fourth lens having a focal power; a fifth lens having optical power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, satisfy between the effective focal length f of optical imaging lens and the entrance pupil diameter EPD of optical imaging lens: f/EPD < 1.9; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: 30 ° < FOV <55 °. The invention solves the problem of poor imaging quality of the optical imaging lens in the prior art.

Description

Optical imaging lens

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an optical imaging lens.

Background

With the development of mobile phone photography technology, mobile phone photography products are ubiquitous in the circle of friends of people; how to take a more beautiful and layered picture is one of the main concerns of the current consumers for purchasing mobile phone products. The existing optical imaging lens has the defects that the shot product is darker, so that the imaging quality is poor.

That is to say, the optical imaging lens in the prior art has the problem of poor imaging quality.

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens to solve the problem of poor imaging quality of the optical imaging lens in the prior art.

In order to achieve the above object, the present invention provides an optical imaging lens, comprising in order from an object side to an image side of the optical imaging lens: the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, 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; a fourth lens having a focal power; a fifth lens having optical power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, satisfy between the effective focal length f of optical imaging lens and the entrance pupil diameter EPD of optical imaging lens: f/EPD < 1.9; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: 30 ° < FOV <55 °.

Further, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface of the optical imaging lens and an effective focal length f of the optical imaging lens satisfy: TTL/f < 1.1.

Further, the effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 1.4< f1/R1< 2.2.

Further, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.5< f6/f2< 3.3.

Further, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0.1< R5/R6< 1.1.

Further, the effective half aperture DT11 of the object side surface of the first lens, the effective half aperture DT12 of the image side surface of the first lens, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens satisfy: 0.9< (DT11+ DT12)/ImgH < 1.5.

Further, a composite focal length f12 of the first lens and the second lens, a center thickness CT1 of the first lens on the optical axis of the optical imaging lens, and a center thickness CT2 of the second lens on the optical axis satisfy: 3.3< f12/(CT1+ CT2) < 5.3.

Further, the combined focal length f56 of the fifth lens and the sixth lens and the combined focal length f34 of the third lens and the fourth lens satisfy: -2.5< f56/f34< 0.5.

Further, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the optical imaging lens, an air interval T23 between the second lens and the third lens on the optical axis of the optical imaging lens, and an air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 4.5< TTL/(T23+ T34) < 10.0.

Further, an air space T45 between the fourth lens and the fifth lens on the optical axis of the optical imaging lens, an air space T56 between the fifth lens and the sixth lens on the optical axis, an on-axis distance SAG51 between an intersection point of an object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, and an on-axis distance SAG52 between an intersection point of an image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens satisfy: -3.4< (T45+ T56)/(SAG51+ SAG52) < -1.0.

Further, an on-axis distance SAG11 between an intersection point of the object-side surface of the first lens and the optical axis of the optical imaging lens to an effective radius vertex of the object-side surface of the first lens, an on-axis distance SAG21 between an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens, and an on-axis distance SAG22 between an intersection point of the image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens satisfy: 1.0< SAG11/(SAG21+ SAG22) < 2.9.

Further, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 0.3< ET5/ET6< 1.9.

Further, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the edge thickness ET4 of the fourth lens satisfy: 1.0< (ET1+ ET2)/(ET3+ ET4) < 2.2.

By applying the technical scheme of the invention, the optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side of the optical imaging lens, wherein the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, 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; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, satisfy between the effective focal length f of optical imaging lens and the entrance pupil diameter EPD of optical imaging lens: f/EPD < 1.9; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: 30 ° < FOV <55 °.

By setting the first lens to positive focal power and the second lens to negative focal power, the aperture of the optical imaging lens can be increased, and meanwhile, under the condition of a large aperture, the spherical aberration is reduced; the third lens with positive focal power, the convex object side surface and the concave image side surface can be favorable for eliminating aberrations such as coma aberration, chromatic aberration and astigmatism of the optical imaging lens; the fourth lens element and the fifth lens element are combined with a sixth lens element, the image side surface of which is concave and has negative focal power, and the fourth lens element and the fifth lens element are mainly used for correcting aberrations such as field curvature, distortion and the like of the system. By limiting the f/EPD within a reasonable range, the light transmission quantity of the optical imaging lens can be increased and the overall illuminance can be improved by increasing the aperture. And the FOV is limited within a reasonable range, so that the effect of the optical imaging lens in the process of shooting the character features is more attractive in aesthetic point of view. Preferably, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 1.6< f/EPD < 1.88. The maximum field angle FOV of the optical imaging lens satisfies: 40 ° < FOV <52 °.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention;

fig. 2 to 5 respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens in fig. 1;

fig. 6 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;

fig. 7 to 10 respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens in fig. 6;

fig. 11 is a schematic structural diagram showing an optical imaging lens according to a third embodiment of the present invention;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 11;

fig. 16 is a schematic structural diagram showing an optical imaging lens according to a fourth embodiment of the present invention;

fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 16;

fig. 21 is a schematic structural view showing an optical imaging lens according to embodiment five of the present invention;

fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 21;

fig. 26 is a schematic structural view showing an optical imaging lens according to a sixth embodiment of the present invention;

fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 26;

fig. 31 is a schematic structural view showing an optical imaging lens according to a seventh embodiment of the present invention;

fig. 32 to 35 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 31.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, an image side surface of the sixth lens element; e7, a filter plate; s13, the object side surface of the filter plate; s14, the image side surface of the filter plate; and S15, imaging surface.

Detailed Description

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 invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present 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. The surface of each lens close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides an optical imaging lens, aiming at solving the problem of poor imaging quality of the optical imaging lens in the prior art.

As shown in fig. 1 to 35, the optical imaging lens includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, the first lens element has positive refractive power, and an object-side surface of the first lens element is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, 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; the fourth lens has focal power; the fifth lens has focal power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, satisfy between the effective focal length f of optical imaging lens and the entrance pupil diameter EPD of optical imaging lens: f/EPD < 1.9; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: 30 ° < FOV <55 °.

By setting the first lens to positive focal power and the second lens to negative focal power, the aperture of the optical imaging lens can be increased, and meanwhile, under the condition of a large aperture, the spherical aberration is reduced; the third lens with positive focal power, the convex object side surface and the concave image side surface can be favorable for eliminating aberrations such as coma aberration, chromatic aberration and astigmatism of the optical imaging lens; the fourth lens element and the fifth lens element are combined with a sixth lens element, the image side surface of which is concave and has negative focal power, and the fourth lens element and the fifth lens element are mainly used for correcting aberrations such as field curvature, distortion and the like of the system. By limiting the f/EPD within a reasonable range, the light transmission quantity of the optical imaging lens can be increased and the overall illuminance can be improved by increasing the aperture. And the FOV is limited within a reasonable range, so that the effect of the optical imaging lens in the process of shooting the character features is more attractive in aesthetic point of view.

Preferably, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 1.6< f/EPD < 1.88. The maximum field angle FOV of the optical imaging lens satisfies: 40 ° < FOV <52 °.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface of the optical imaging lens and an effective focal length f of the optical imaging lens satisfy: TTL/f < 1.1. By limiting TTL/f in a reasonable range, the compression transformation of an object image space can be realized, so that a shot portrait is presented on a chip as much as possible, the effect of presenting a main body and blurring a background is realized, and the detailed morphological characteristics of the shot main body are highlighted. Preferably, 0.9< TTL/f < 1.08.

In the present embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 1.4< f1/R1< 2.2. By limiting f1/R1 within a reasonable range, the bending degree of the lens is reduced, the process is facilitated, large-angle ghost generated by reflection of the first lens is optimized, and the imaging quality of the optical imaging lens is improved. Preferably, 1.5< f1/R1< 2.1.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.5< f6/f2< 3.3. By limiting f6/f2 within a reasonable range, curvature of field can be corrected, spherical aberration, coma aberration and chromatic aberration of the optical imaging lens can be reduced, and the imaging quality of the optical imaging lens can be improved. Preferably 0.6< f6/f2< 3.2.

In the present embodiment, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0.1< R5/R6< 1.1. The distribution of the focal power of the third lens is realized by controlling the curvatures of the object side surface and the image side surface of the third lens, which is beneficial to comprehensively balancing the spherical aberration, chromatic aberration and field curvature of the optical imaging lens and is beneficial to the manufacturability of lens processing. Preferably 0.2< R5/R6< 1.0.

In the present embodiment, the effective half aperture DT11 of the object side surface of the first lens, the effective half aperture DT12 of the image side surface of the first lens, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens satisfy: 0.9< (DT11+ DT12)/ImgH < 1.5. By limiting (DT11+ DT12)/ImgH within a reasonable range, the optical power of the first lens is enhanced, the light gathering capacity of the first lens is increased, the light flux is increased, the image plane illumination is improved, and the imaging quality of the optical imaging lens is improved. Preferably, 1.0< (DT11+ DT12)/ImgH < 1.3.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, and the center thickness CT2 of the second lens on the optical axis satisfy: 3.3< f12/(CT1+ CT2) < 5.3. The relationship between the synthetic focal length of the first lens and the second lens and the central thickness of the second lens of the first lens is controlled, so that the reasonable distribution of the focal power of the first lens and the focal power of the second lens is facilitated, and the improvement of the manufacturability of the processing of the first lens and the second lens is facilitated. Preferably, 3.2< f12/(CT1+ CT2) < 5.2.

In the present embodiment, the combined focal length f56 of the fifth lens and the sixth lens, and the combined focal length f34 of the third lens and the fourth lens satisfy: -2.5< f56/f34< 0.5. The focal power can be reasonably distributed by controlling the relationship between the combined focal length of the fifth lens and the sixth lens and the combined focal length of the third lens and the fourth lens, so that the aberration of the optical imaging lens is reduced, and the performance of the optical imaging lens is improved. Preferably, -2.4< f56/f34< 0.4.

In the present embodiment, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the optical imaging lens, an air interval T23 between the second lens and the third lens on the optical axis of the optical imaging lens, and an air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 4.5< TTL/(T23+ T34) < 10.0. By limiting TTL/(T23+ T34) within a reasonable range, optimization of chromatic aberration of the optical imaging lens is facilitated, ghost images generated by reflection between the second lens and the third lens and between the second lens and the fourth lens are facilitated, and imaging quality of the optical imaging lens is improved. Preferably, 4.6< TTL/(T23+ T34) < 9.8.

In the present embodiment, an air space T45 between the fourth lens and the fifth lens on the optical axis of the optical imaging lens, an air space T56 between the fifth lens and the sixth lens on the optical axis, an on-axis distance SAG51 between the intersection of the object-side surface of the fifth lens and the optical axis and the effective radius vertex of the object-side surface of the fifth lens, and an on-axis distance SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the effective radius vertex of the image-side surface of the fifth lens satisfy: -3.4< (T45+ T56)/(SAG51+ SAG52) < -1.0. By controlling (T45+ T56)/(SAG51+ SAG52) in a reasonable range, the shape of the lens is favorably controlled, the manufacturability of lens processing is improved, the balance of the comprehensive curvature of field of the optical imaging lens is favorably realized, and the distortion of the optical imaging lens is reduced. Preferably, -3.3< (T45+ T56)/(SAG51+ SAG52) < -1.1.

In the present embodiment, the on-axis distance SAG11 between the intersection point of the object-side surface of the first lens and the optical axis of the optical imaging lens to the effective radius vertex of the object-side surface of the first lens, the on-axis distance SAG21 between the intersection point of the object-side surface of the second lens and the optical axis to the effective radius vertex of the object-side surface of the second lens, and the on-axis distance SAG22 between the intersection point of the image-side surface of the second lens and the optical axis to the effective radius vertex of the image-side surface of the second lens satisfy: 1.0< SAG11/(SAG21+ SAG22) < 2.9. By controlling SAG11/(SAG21+ SAG22) within a reasonable range, multiple aberrations such as spherical aberration, chromatic aberration, coma aberration and the like of the optical imaging lens can be corrected, and meanwhile, the shape of the lens can be restrained, and the manufacturability of lens processing can be improved. Preferably, 1.1< SAG11/(SAG21+ SAG22) < 2.8.

In the present embodiment, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 0.3< ET5/ET6< 1.9. By controlling the ratio of the edge thicknesses of the fifth lens and the sixth lens, the processing manufacturability of the system is enhanced, the optimization of the field curvature and distortion of the outer field of view of the optical imaging lens is facilitated, the optimization of ghost images generated by reflection of the fifth lens and the sixth lens is facilitated, and the imaging quality of the optical imaging lens is improved. Preferably 0.4< ET5/ET6< 1.8.

In the present embodiment, the edge thicknesses ET1, ET2, ET3 and ET4 of the first lens, the second lens and the fourth lens satisfy: 1.0< (ET1+ ET2)/(ET3+ ET4) < 2.2. By limiting (ET1+ ET2)/(ET3+ ET4) within a reasonable range, the edge thickness of the front four lenses can be controlled, the aberration of the optical imaging lens can be optimized, the overall sensitivity of the optical imaging lens can be reduced, and the manufacturability of the optical imaging lens can be enhanced. Preferably, 1.1< (ET1+ ET2)/(ET3+ ET4) < 2.1.

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 in the present application may employ a plurality of lenses, for example, the above-mentioned six lenses. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical imaging lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The optical imaging lens also has large aperture and large field angle. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

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 six lenses are exemplified in the embodiment, the optical imaging lens is not limited to include six lenses. The optical imaging lens may also include other numbers of lenses, as desired.

Examples of specific surface types and parameters applicable to the optical imaging lens of the above-described embodiment are further described below with reference to the drawings.

Example one

As shown in fig. 1 to 5, an optical imaging lens according to a first embodiment of the present application is described. Fig. 1 is a schematic diagram illustrating a structure of an optical imaging lens according to a first embodiment.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.10mm, the maximum field angle FOV of the optical imaging lens is 50.7 °, the total length TTL of the optical imaging lens is 6.83mm, and the image height ImgH is 3.40 mm.

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

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 which can be used for each of the aspherical mirrors S1-S12 in example one.

TABLE 2

Fig. 2 shows an axial chromatic aberration curve of the optical imaging lens according to the first embodiment, which indicates that light rays with different wavelengths are deviated from a convergent focus after passing through the optical imaging lens. Fig. 3 shows astigmatism curves of the optical imaging lens according to the first embodiment, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the optical imaging lens according to the first embodiment, which indicate values of distortion magnitudes corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the optical imaging lens according to the first embodiment, which shows the deviation of different image heights on the imaging surface after the light passes through the lens.

As can be seen from fig. 2 to 5, the optical imaging lens according to the first embodiment can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an optical imaging lens according to a second embodiment of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions of parts similar to those of the first embodiment will be omitted. Fig. 6 is a schematic diagram showing a structure of an optical imaging lens according to a second embodiment.

As shown in fig. 6, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.17mm, the maximum field angle FOV of the optical imaging lens is 50.5 °, the total length TTL of the optical imaging lens is 7.5mm, and the image height ImgH is 3.40 mm.

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

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 4

Fig. 7 shows an on-axis chromatic aberration curve of the optical imaging lens of the second embodiment, which represents the deviation of the convergent focal points of the light rays of different wavelengths after passing through the optical imaging lens. Fig. 8 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of the second embodiment. Fig. 9 shows distortion curves of the optical imaging lens of the second embodiment, which represent distortion magnitude values corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the optical imaging lens according to the second embodiment, which shows the deviation of different image heights on the imaging surface after the light passes through the lens.

As can be seen from fig. 7 to 10, the optical imaging lens according to the second embodiment can achieve good imaging quality.

EXAMPLE III

As shown in fig. 11 to 15, an optical imaging lens of a third embodiment of the present application is described. Fig. 11 is a schematic diagram showing a structure of an optical imaging lens according to a third embodiment.

As shown in fig. 11, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.19mm, the maximum field angle FOV of the optical imaging lens is 51.5 °, the total length TTL of the optical imaging lens is 7.49mm, and the image height ImgH is 3.50 mm.

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

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula (1) given in the first embodiment.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-8.1205E-04

-1.2260E-03

2.8989E-03

-4.6847E-03

4.6409E-03

-3.0217E-03

1.3268E-03

S2

5.5339E-02

-9.1204E-02

1.0231E-01

-7.2588E-02

2.8428E-02

-1.2415E-03

-5.0214E-03

S3

9.9338E-03

-9.5488E-02

1.3872E-01

-1.4105E-01

1.2266E-01

-9.4654E-02

6.1280E-02

S4

-4.9478E-02

-1.4064E-02

-1.1982E-03

4.3378E-02

-5.8591E-02

3.5056E-02

-4.3535E-03

S5

1.2161E-01

-2.2893E-01

5.7260E-01

-1.4642E+00

2.8785E+00

-4.1146E+00

4.2593E+00

S6

8.5710E-02

-8.1601E-02

1.4545E-02

3.1355E-01

-1.1923E+00

2.4653E+00

-3.3019E+00

S7

-3.3466E-02

-1.1399E-01

9.6129E-01

-4.1798E+00

1.1503E+01

-2.1597E+01

2.8604E+01

S8

-7.3219E-02

8.3936E-02

-1.3987E-01

1.5638E-01

-7.6452E-02

-7.9070E-02

1.9348E-01

S9

-3.5416E-02

2.1809E-02

-3.5615E-02

2.0183E-02

1.6596E-02

-4.7236E-02

4.7353E-02

S10

-6.8252E-02

8.3077E-02

-1.4022E-01

1.9566E-01

-2.1493E-01

1.7748E-01

-1.0883E-01

S11

-1.8217E-01

7.9304E-02

-2.8267E-02

1.0538E-02

-7.6483E-03

6.5714E-03

-4.0410E-03

S12

-1.8439E-01

8.9042E-02

-4.2787E-02

1.6427E-02

-4.1130E-03

8.0904E-05

4.7948E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.9610E-04

7.9345E-05

-1.0224E-05

7.6680E-07

-2.5487E-08

0.0000E+00

0.0000E+00

S2

2.9092E-03

-8.4767E-04

1.4325E-04

-1.3375E-05

5.3606E-07

0.0000E+00

0.0000E+00

S3

-3.0786E-02

1.1299E-02

-2.8839E-03

4.8154E-04

-4.7140E-05

2.0482E-06

0.0000E+00

S4

-7.8770E-03

5.7995E-03

-1.8918E-03

3.1278E-04

-2.1250E-05

0.0000E+00

0.0000E+00

S5

-3.1892E+00

1.7155E+00

-6.5144E-01

1.6880E-01

-2.8010E-02

2.6240E-03

-1.0113E-04

S6

3.0187E+00

-1.9076E+00

8.2192E-01

-2.3086E-01

3.8145E-02

-2.8142E-03

0.0000E+00

S7

-2.7147E+01

1.8518E+01

-8.9938E+00

3.0311E+00

-6.7294E-01

8.8413E-02

-5.2020E-03

S8

-1.8934E-01

1.1158E-01

-4.2110E-02

9.9825E-03

-1.3566E-03

8.0695E-05

0.0000E+00

S9

-2.6652E-02

8.4308E-03

-9.9942E-04

-2.5749E-04

1.1990E-04

-1.8315E-05

1.0412E-06

S10

4.9379E-02

-1.6477E-02

3.9846E-03

-6.7821E-04

7.6891E-05

-5.2007E-06

1.5837E-07

S11

1.6705E-03

-4.6827E-04

8.9354E-05

-1.1449E-05

9.4423E-07

-4.5375E-08

9.6705E-10

S12

-2.4795E-04

7.2256E-05

-1.3868E-05

1.7842E-06

-1.4847E-07

7.2308E-09

-1.5662E-10

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the optical imaging lens of the third embodiment, which represents the deviation of the convergent focal points of the light rays of different wavelengths after passing through the optical imaging lens. Fig. 13 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of the third embodiment. Fig. 14 shows distortion curves of the optical imaging lens of the third embodiment, which represent distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the optical imaging lens according to the third embodiment, which shows the deviation of different image heights on the imaging surface after the light passes through the lens.

As can be seen from fig. 12 to 15, the optical imaging lens according to the third embodiment can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an optical imaging lens according to a fourth embodiment of the present application is described. Fig. 16 is a schematic diagram showing a configuration of an optical imaging lens according to a fourth embodiment.

As shown in fig. 16, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.19mm, the maximum field angle FOV of the optical imaging lens is 50.2 °, the total length TTL of the optical imaging lens is 7.50mm, and the image height ImgH is 3.40 mm.

Table 7 shows a basic structural parameter table of the optical imaging lens of the fourth embodiment, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula (1) given in the first embodiment described above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.3336E-03

7.9343E-04

-1.8369E-03

2.4317E-03

-2.5549E-03

2.0326E-03

-1.1856E-03

S2

4.7073E-02

-8.2583E-02

1.4578E-01

-2.1701E-01

2.4305E-01

-1.9715E-01

1.1499E-01

S3

-1.2335E-03

-9.1704E-02

2.6113E-01

-5.3778E-01

7.7710E-01

-7.8126E-01

5.5241E-01

S4

-5.8644E-02

3.8310E-03

8.4933E-03

-2.3319E-02

2.0297E-02

2.6064E-02

-7.8390E-02

S5

1.1106E-01

-1.8568E-01

3.5964E-01

-6.3502E-01

7.1493E-01

-2.6275E-01

-5.4335E-01

S6

7.4799E-02

-2.3278E-02

-2.6722E-01

1.3145E+00

-3.5927E+00

6.4451E+00

-7.9547E+00

S7

-2.4231E-02

-1.8951E-01

1.3827E+00

-5.6238E+00

1.4832E+01

-2.7008E+01

3.4956E+01

S8

-6.5921E-02

4.8224E-02

9.4277E-03

-2.2598E-01

5.6818E-01

-8.2990E-01

8.1134E-01

S9

-3.2710E-02

-3.8992E-03

7.3889E-02

-2.5539E-01

4.8031E-01

-5.9376E-01

5.0900E-01

S10

-6.3481E-02

5.8404E-02

-7.5208E-02

8.2223E-02

-7.5672E-02

5.4571E-02

-2.9931E-02

S11

-1.7584E-01

5.8166E-02

1.3211E-03

-1.8078E-02

1.3691E-02

-5.9520E-03

1.6775E-03

S12

-1.7710E-01

6.8082E-02

-1.2537E-02

-1.3115E-02

1.6657E-02

-1.0616E-02

4.5453E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

4.9289E-04

-1.4296E-04

2.8140E-05

-3.5767E-06

2.6466E-07

-8.6618E-09

0.0000E+00

S2

-4.8044E-02

1.4225E-02

-2.9101E-03

3.9084E-04

-3.0991E-05

1.0990E-06

0.0000E+00

S3

-2.7636E-01

9.7261E-02

-2.3544E-02

3.7311E-03

-3.4843E-04

1.4534E-05

0.0000E+00

S4

8.5809E-02

-5.4069E-02

2.1225E-02

-5.1424E-03

7.0616E-04

-4.2131E-05

0.0000E+00

S5

1.0717E+00

-9.8727E-01

5.6488E-01

-2.1036E-01

4.9822E-02

-6.8384E-03

4.1496E-04

S6

6.8792E+00

-4.1653E+00

1.7309E+00

-4.7057E-01

7.5403E-02

-5.4021E-03

0.0000E+00

S7

-3.2587E+01

2.1912E+01

-1.0514E+01

3.5058E+00

-7.7052E-01

1.0020E-01

-5.8316E-03

S8

-5.5159E-01

2.6218E-01

-8.5568E-02

1.8282E-02

-2.3029E-03

1.2964E-04

0.0000E+00

S9

-3.0922E-01

1.3384E-01

-4.0936E-02

8.6343E-03

-1.1942E-03

9.7492E-05

-3.5625E-06

S10

1.2374E-02

-3.8276E-03

8.7133E-04

-1.4095E-04

1.5170E-05

-9.5879E-07

2.6346E-08

S11

-3.0725E-04

3.5045E-05

-2.2503E-06

6.1946E-08

0.0000E+00

0.0000E+00

0.0000E+00

S12

-1.3902E-03

3.0817E-04

-4.9182E-05

5.5091E-06

-4.1091E-07

1.8318E-08

-3.6903E-10

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the optical imaging lens of the fourth embodiment, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 18 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of the fourth embodiment. Fig. 19 shows distortion curves of the optical imaging lens of the fourth embodiment, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging lens according to the fourth embodiment, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

As can be seen from fig. 17 to 20, the optical imaging lens according to the fourth embodiment can achieve good imaging quality.

EXAMPLE five

As shown in fig. 21 to 25, an optical imaging lens of fifth embodiment of the present application is described. Fig. 21 is a schematic diagram showing a configuration of an optical imaging lens of embodiment five.

As shown in fig. 21, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.19mm, the maximum field angle FOV of the optical imaging lens is 50.2 °, the total length TTL of the optical imaging lens is 7.50mm, and the image height ImgH is 3.40 mm.

Table 9 shows a basic structural parameter table of the optical imaging lens of example five, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.1456E-03

9.8860E-04

-1.5836E-03

1.2667E-03

-6.4279E-04

1.9100E-04

-2.7451E-05

S2

3.5446E-02

-8.4710E-02

1.3164E-01

-1.3376E-01

9.3307E-02

-4.5304E-02

1.5252E-02

S3

-1.9010E-02

-7.2505E-02

9.6159E-02

-7.9324E-02

4.8714E-02

-2.1566E-02

6.5393E-03

S4

-6.5854E-02

4.8398E-02

-3.2416E-01

1.0191E+00

-2.1154E+00

3.0883E+00

-3.2365E+00

S5

5.8837E-02

-5.2711E-02

2.8634E-01

-1.0512E+00

2.4871E+00

-4.1069E+00

4.8874E+00

S6

2.7194E-02

5.6606E-02

-2.6709E-01

1.0281E+00

-2.7294E+00

4.9697E+00

-6.3150E+00

S7

-8.8776E-02

-1.8698E-02

2.5426E-01

-5.7491E-01

4.9999E-02

2.7919E+00

-7.6995E+00

S8

-9.4352E-02

6.4604E-02

-8.5015E-02

1.3167E-01

-1.9863E-01

2.3815E-01

-2.0580E-01

S9

-5.2885E-02

3.6491E-02

1.2240E-02

-1.5921E-01

3.4417E-01

-4.4006E-01

3.8175E-01

S10

-9.1099E-02

1.1185E-01

-1.4878E-01

1.6746E-01

-1.5042E-01

1.0241E-01

-5.1790E-02

S11

-2.1395E-01

1.3082E-01

-9.2693E-02

8.5311E-02

-7.3038E-02

4.7480E-02

-2.2397E-02

S12

-2.0608E-01

1.3022E-01

-9.5045E-02

6.9075E-02

-4.2878E-02

2.0675E-02

-7.4764E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-7.2324E-07

8.8355E-07

-1.2077E-07

5.4294E-09

0.0000E+00

0.0000E+00

0.0000E+00

S2

-3.4858E-03

5.1544E-04

-4.4446E-05

1.6964E-06

0.0000E+00

0.0000E+00

0.0000E+00

S3

-1.2778E-03

1.4438E-04

-7.1490E-06

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S4

2.4583E+00

-1.3535E+00

5.3430E-01

-1.4729E-01

2.6907E-02

-2.9256E-03

1.4326E-04

S5

-4.2445E+00

2.6927E+00

-1.2340E+00

3.9747E-01

-8.5289E-02

1.0936E-02

-6.3333E-04

S6

5.6535E+00

-3.5486E+00

1.5274E+00

-4.2908E-01

7.0815E-02

-5.2038E-03

0.0000E+00

S7

1.1448E+01

-1.0976E+01

7.0879E+00

-3.0737E+00

8.5972E-01

-1.4028E-01

1.0148E-02

S8

1.2380E-01

-5.0332E-02

1.3155E-02

-1.9930E-03

1.3297E-04

0.0000E+00

0.0000E+00

S9

-2.3476E-01

1.0369E-01

-3.2709E-02

7.1903E-03

-1.0460E-03

9.0460E-05

-3.5182E-06

S10

1.9210E-02

-5.1452E-03

9.7109E-04

-1.2399E-04

9.9577E-06

-4.3488E-07

7.0861E-09

S11

7.6144E-03

-1.8581E-03

3.2180E-04

-3.8563E-05

3.0388E-06

-1.4163E-07

2.9581E-09

S12

2.0022E-03

-3.9340E-04

5.5866E-05

-5.5735E-06

3.7031E-07

-1.4705E-08

2.6393E-10

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging lens of the fifth embodiment, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of example five. Fig. 24 shows distortion curves of the optical imaging lens of embodiment five, which represent distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the optical imaging lens of the fifth embodiment, which represents a deviation of different image heights on the imaging surface after light passes through the lens.

As can be seen from fig. 22 to 25, the optical imaging lens according to the fifth embodiment can achieve good imaging quality.

EXAMPLE six

As shown in fig. 26 to 30, an optical imaging lens according to a sixth embodiment of the present application is described. Fig. 26 is a schematic diagram showing a configuration of an optical imaging lens of embodiment six.

As shown in fig. 26, the optical imaging lens, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.14mm, the maximum field angle FOV of the optical imaging lens is 47.7 °, the total length TTL of the optical imaging lens is 6.85mm, and the image height ImgH is 3.20 mm.

Table 11 shows a basic structural parameter table of the optical imaging lens of example six, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each aspherical mirror surface in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the optical imaging lens of the sixth embodiment, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of example six. Fig. 29 shows distortion curves of the optical imaging lens of the sixth embodiment, which represent distortion magnitude values corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the optical imaging lens of the sixth embodiment, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

As can be seen from fig. 27 to 30, the optical imaging lens according to the sixth embodiment can achieve good imaging quality.

EXAMPLE seven

As shown in fig. 31 to 35, an optical imaging lens of a seventh embodiment of the present application is described. Fig. 31 is a schematic diagram showing a structure of an optical imaging lens of the seventh embodiment.

As shown in fig. 31, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element are convex. The second lens E2 has negative power, and the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the present embodiment, the total effective focal length f of the optical imaging lens is 7.23mm, the maximum field angle FOV of the optical imaging lens is 49.4 °, the total length TTL of the optical imaging lens is 7.49mm, and the image height ImgH is 3.35 mm.

Table 13 shows a basic structural parameter table of the optical imaging lens of example seven, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Watch 13

Table 14 shows the high-order term coefficients that can be used for each aspherical mirror surface in example seven, wherein each aspherical mirror surface type can be defined by formula (1) given in the above-described first example.

TABLE 14

Fig. 32 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment seven, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 33 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment seven. Fig. 34 shows distortion curves of the optical imaging lens of embodiment seven, which represent distortion magnitude values corresponding to different angles of view. Fig. 35 shows a chromatic aberration of magnification curve of the optical imaging lens of the seventh embodiment, which represents a deviation of different image heights on the imaging surface after light passes through the lens.

As can be seen from fig. 22 to 35, the optical imaging lens according to the seventh embodiment can achieve good imaging quality.

In summary, the first to seventh embodiments satisfy the relationships shown in table 15, respectively.

Conditions/examples	1	2	3	4	5	6	7
								f/EPD	1.81	1.63	1.64	1.64	1.64	1.85	1.67
FOV(°)	50.7	50.5	51.5	50.2	50.2	47.7	49.4
								TTL/f	0.96	1.05	1.04	1.04	1.04	0.96	1.04
f1/R1	1.86	1.77	1.62	1.62	1.61	2.02	1.59
								f6/f2	1.83	1.28	3.12	3.12	2.24	0.75	1.43
R5/R6	0.82	0.93	0.81	0.82	0.22	0.90	0.94
								(DT11+DT12)/ImgH	1.12	1.25	1.20	1.24	1.24	1.17	1.25
f12/(CT1+CT2)	4.72	4.73	4.27	4.25	3.44	5.17	4.48
								f56/f34	-0.31	-0.57	-0.35	-0.32	0.31	-2.21	-0.41
TTL/(T23+T34)	4.75	7.74	6.57	6.91	7.51	5.18	7.48
								(T45+T56)/(SAG51+SAG52)	-1.12	-1.60	-1.52	-1.59	-1.38	-3.21	-1.72
SAG11/(SAG21+SAG22)	1.43	1.24	2.73	2.72	1.96	1.72	2.15
								ET5/ET6	1.73	0.63	0.86	0.85	0.86	0.93	1.19
(ET1+ET2)/(ET3+ET4)	1.14	1.67	1.70	1.68	1.79	1.12	1.81

Watch 15

Table 16 shows the effective focal lengths f of the optical imaging lenses of the first to seventh embodiments, and the effective focal lengths f1 to f6 of the respective lenses.

TABLE 16

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (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.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

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

a first lens having a positive focal power, an object side surface of the first lens being a convex surface;

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

the third lens has positive focal power, 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;

a fourth lens having an optical power;

a fifth lens having an optical power;

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

wherein the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.9;

the maximum field angle FOV of the optical imaging lens satisfies the following conditions: 30 ° < FOV <55 °.

2. The optical imaging lens of claim 1, wherein an on-axis distance TTL from an object-side surface of the first lens element to an imaging surface of the optical imaging lens and an effective focal length f of the optical imaging lens satisfy: TTL/f < 1.1.

3. The optical imaging lens of claim 1, wherein an effective focal length f1 of the first lens and a radius of curvature R1 of an object side of the first lens satisfy: 1.4< f1/R1< 2.2.

4. The optical imaging lens of claim 1, wherein an effective focal length f6 of the sixth lens and an effective focal length f2 of the second lens satisfy: 0.5< f6/f2< 3.3.

5. The optical imaging lens of claim 1, wherein a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0.1< R5/R6< 1.1.

6. The optical imaging lens of claim 1, wherein the effective half aperture DT11 of the object side surface of the first lens, the effective half aperture DT12 of the image side surface of the first lens, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfy: 0.9< (DT11+ DT12)/ImgH < 1.5.

7. The optical imaging lens of claim 1, wherein a combined focal length f12 of the first lens and the second lens, a center thickness CT1 of the first lens on an optical axis of the optical imaging lens, and a center thickness CT2 of the second lens on the optical axis satisfy: 3.3< f12/(CT1+ CT2) < 5.3.

8. The optical imaging lens of claim 1, wherein a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f34 of the third lens and the fourth lens satisfy: -2.5< f56/f34< 0.5.

9. The optical imaging lens of claim 1, wherein an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the optical imaging lens, an air interval T23 between the second lens and the third lens on an optical axis of the optical imaging lens, and an air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 4.5< TTL/(T23+ T34) < 10.0.

10. The optical imaging lens of claim 1, wherein an air interval T45 between the fourth lens and the fifth lens on an optical axis of the optical imaging lens, an air interval T56 between the fifth lens and the sixth lens on the optical axis, an on-axis distance SAG51 between an intersection point of an object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens, and an on-axis distance SAG52 between an intersection point of an image side surface of the fifth lens and the optical axis to an effective radius vertex of an image side surface of the fifth lens satisfy: -3.4< (T45+ T56)/(SAG51+ SAG52) < -1.0.

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