CN216210176U

CN216210176U - Optical imaging lens

Info

Publication number: CN216210176U
Application number: CN202122274521.4U
Authority: CN
Inventors: 张爽; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-04-05
Anticipated expiration: 2031-09-18

Abstract

The present invention provides an optical imaging lens, including: the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; a second lens having a negative focal power; the third lens has negative 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 negative focal power, and the object side surface of the fourth lens is a concave surface; a fifth lens having a positive refractive power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.5< f123/(CT1+ CT2+ CT3) < 3.5. The utility model solves the problem of poor imaging quality of the optical imaging lens in the prior art.

Description

Optical imaging lens

Technical Field

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

Background

Along with the universality of mobile phone use, the convenience of mobile phone photographing is greatly highlighted, more and more people are interested in mobile phone photographing, meanwhile, the requirement for mobile phone photographing is more and more, the photographing quality of a mobile phone camera is more and more, a great number of mobile phone photographing enthusiasts can photograph shared pictures through the mobile phone every day, but the photographing quality of the camera is not ideal due to the limitation of the size of the mobile phone.

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

SUMMERY OF THE UTILITY MODEL

The utility model 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, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; a second lens having a negative focal power; the third lens has negative 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 negative focal power, and the object side surface of the fourth lens is a concave surface; a fifth lens having a positive refractive power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.5< f123/(CT1+ CT2+ CT3) < 3.5.

Further, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.95.

Further, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy: 0.1< (f2+ f4)/f3< 2.0.

Further, the effective focal length f5 of the fifth lens, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following conditions: 1.0< f5/(f + f1) < 1.7.

Further, a radius of curvature R2 of the image-side surface of the first lens and a radius of curvature R1 of the object-side surface of the first lens satisfy: 1.0< (R2-R1)/(R2+ R1) < 1.7.

Further, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R5 of the object-side surface of the third lens and the effective focal length f of the optical imaging lens satisfy: 0.8< (R5+ R6)/f < 1.5.

Further, the effective half aperture DT11 of the object side surface of the first lens and the effective half aperture DT31 of the object side surface of the third lens satisfy: 1.0< DT11/DT31< 1.5.

Further, the effective half aperture DT61 of the object side surface of the sixth lens, the effective half aperture DT62 of the image side surface of the sixth lens, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens satisfy: 1.2< (DT61+ DT62)/ImgH < 1.7.

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 air interval T56 between the fifth lens element and the sixth lens element on the optical axis of the optical imaging lens satisfy: 4.2< TTL/T56< 5.4.

Further, an on-axis distance SAG51 between an intersection point of the object-side surface of the fifth lens and the optical axis of the optical imaging lens 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 the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens satisfy: 1.1< SAG52/SAG51< 1.6.

Further, the edge thickness ET2 of the second lens, the edge thickness ET4 of the fourth lens, the center thickness CT2 of the second lens and the center thickness CT4 of the fourth lens satisfy: 1.8< (ET2+ ET4)/(CT2+ CT4) < 2.7.

Further, an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and an optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the sixth lens, an on-axis distance SAG62 between an intersection point of an image-side surface of the sixth lens and the optical axis and an effective radius vertex of the image-side surface of the sixth lens, and an edge thickness ET6 of the sixth lens satisfy: -9< (SAG61+ SAG62)/ET6< -6.

By applying the technical scheme of the utility model, 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, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the second lens has negative focal power; the third lens has negative 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 negative focal power, and the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.5< f123/(CT1+ CT2+ CT3) < 3.5.

The light passes through the first lens with positive focal power, and both the object side surface and the image side surface are convex surfaces, so that the light can generate larger deflection, and is matched with the second lens with negative focal power, the propagation path of the light can be improved, and the phenomenon of over-steep appearance in optics is avoided. The relationship between the focal length and the central thickness of the first three lenses is restrained, so that the distribution of the focal power is mainly improved, various aberrations such as spherical aberration, coma aberration, curvature of field and distortion of the optical system are improved, the shape of the lenses is optimized, the manufacturability of the optical system is enhanced, and the sensitivity of the optical system is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. 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 astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 21.

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 utility model.

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 utility model 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 25, 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, wherein the first lens element has positive refractive power, an object-side surface of the first lens element is a convex surface, and an image-side surface of the first lens element is a convex surface; the second lens has negative focal power; the third lens has negative 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 negative focal power, and the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; wherein, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.5< f123/(CT1+ CT2+ CT3) < 3.5.

The light passes through the first lens with positive focal power, and both the object side surface and the image side surface are convex surfaces, so that the light can generate larger deflection, and is matched with the second lens with negative focal power, the propagation path of the light can be improved, and the phenomenon of over-steep appearance in optics is avoided. The relationship between the focal length and the central thickness of the first three lenses is restrained, so that the distribution of the focal power is mainly improved, various aberrations such as spherical aberration, coma aberration, curvature of field and distortion of the optical system are improved, the shape of the lenses is optimized, the manufacturability of the optical system is enhanced, and the sensitivity of the optical system is reduced. Preferably, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.6< f123/(CT1+ CT2+ CT3) < 3.4. The optical imaging lens also serves as an optical system.

In the present embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.95. By limiting the f/EPD within a reasonable range, the optical system can be ensured within a certain aperture range, the size of the luminous flux entering the optical system is improved, and the optical system can clearly image under the condition of enough light transmission. Preferably, 1.8< f/EPD < 1.92.

In the present embodiment, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens, and the effective focal length f3 of the third lens satisfy: 0.1< (f2+ f4)/f3< 2.0. By constraining the focal length relationship among the second lens, the third lens and the fourth lens, the focal power of the optical system is reasonably distributed, the aberrations such as spherical aberration, coma aberration, astigmatism, curvature of field, distortion and chromatic aberration of the optical system are corrected, and the imaging quality of the optical imaging lens is effectively improved. Preferably, 0.2< (f2+ f4)/f3< 1.9.

In the present embodiment, the effective focal length f5 of the fifth lens, the effective focal length f of the optical imaging lens, and the effective focal length f1 of the first lens satisfy: 1.0< f5/(f + f1) < 1.7. The focal power of each lens can be reasonably distributed by reasonably distributing the relationship between the focal lengths of the first lens and the fifth lens and the focal length of the optical imaging lens, the proportion of the aberration generated by the first lens in the comprehensive aberration is minimized in the comprehensive aberration distribution, the sensitivity of the first lens is reduced, the focal power of the fifth lens is restrained, the field curvature is comprehensively debugged through the fifth lens, the aberration of an optical system is comprehensively corrected, and the imaging quality of the optical imaging lens is improved. Preferably, 1.1< f5/(f + f1) < 1.6.

In the present embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens satisfy: 1.0< (R2-R1)/(R2+ R1) < 1.7. By constraining the relationship between the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the first lens, the focal power of the first lens can be improved, the sensitivity of the first lens can be reduced, and the processing performance of the first lens can be improved. Preferably, 1.05< (R2-R1)/(R2+ R1) < 1.6.

In the present embodiment, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0.8< (R5+ R6)/f < 1.5. The focal power of the third lens in the whole optical system is distributed by restricting the relation between the curvature radius of the third lens and the focal length of the optical system, so that the field curvature can be comprehensively balanced to a certain extent, the distortion of the optical system can be reduced, the manufacturability of the third lens can be optimized, and the process performance can be improved, so that the processing of the third lens can be facilitated. Preferably, 0.9< (R5+ R6)/f < 1.4.

In this embodiment, the effective half aperture DT11 of the object side surface of the first lens and the effective half aperture DT31 of the object side surface of the third lens satisfy: 1.0< DT11/DT31< 1.5. By controlling the relation between the caliber of the first lens and the caliber of the third lens, light rays entering the optical system can be guaranteed to be transmitted stably after being refracted by the lenses, meanwhile, the arrangement of the first three lenses is facilitated, the sensitivity of the first three lenses is reduced, the technological performance of the optical system is improved, and the yield is improved. Preferably, 1.1< DT11/DT31< 1.4.

In this embodiment, the effective half aperture DT61 of the object side surface of the sixth lens, the effective half aperture DT62 of the image side surface of the sixth lens, and half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens satisfy: 1.2< (DT61+ DT62)/ImgH < 1.7. By constraining the relation between the caliber of the sixth lens and the imaging surface, the shape of the sixth lens is mainly optimized, the ghost image generated by the internal reflection of the sixth lens is improved, meanwhile, the condition of stray light at the tail end of the optical system can be improved, and the imaging quality of the optical imaging lens is improved. Preferably, 1.4< (DT61+ DT62)/ImgH < 1.6.

In the present 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 air interval T56 on the optical axis between the fifth lens element and the sixth lens element satisfy: 4.2< TTL/T56< 5.4. The relationship between the air space of the fifth lens and the air space of the sixth lens and the total length of the optical imaging lens is restrained, so that the field curvature of the optical system is balanced comprehensively, and the ghost image generated by reflection between the fifth lens and the sixth lens can be improved. Preferably, 4.4< TTL/T56< 5.3.

In the present embodiment, 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 the image-side surface of the fifth lens satisfy: 1.1< SAG52/SAG51< 1.6. By controlling the relationship between the rise of the fifth lens, the shape of the fifth lens is optimized, the processing manufacturability of the fifth lens can be improved, and simultaneously, the field curvature of the optical system can be balanced by optimizing the shape of the fifth lens, and the ghost image generated by reflection between the fifth lens and the chip can be improved. Preferably, 1.2< SAG52/SAG51< 1.5.

In the present embodiment, the edge thickness ET2 of the second lens, the edge thickness ET4 of the fourth lens, the center thickness CT2 of the second lens, and the center thickness CT4 of the fourth lens satisfy: 1.8< (ET2+ ET4)/(CT2+ CT4) < 2.7. By constraining the relationship between the edge thickness and the center thickness of the second lens and the fourth lens, the manufacturability of the lenses can be improved, the sensitivity of the lenses can be reduced, and the yield of the optical system can be improved on the premise of optimizing and balancing aberration. Preferably, 1.9< (ET2+ ET4)/(CT2+ CT4) < 2.6.

In the present embodiment, an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens, an on-axis distance SAG62 between an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens, and an edge thickness ET6 of the sixth lens satisfy: -9< (SAG61+ SAG62)/ET6< -6. By constraining the relation between the rise of the sixth lens and the edge thickness of the sixth lens, the shape of the lenses is favorably optimized and improved, the manufacturability is enhanced, and meanwhile, the method can be used for balancing the field curvature of an optical system and reducing the aberration; meanwhile, by restricting the shape of the lens, the ghost reflected between the sixth lens and the chip can be optimized and improved. Preferably, -8.8< (SAG61+ SAG62)/ET6< -6.5.

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 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 negative 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 convex. 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 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 7.06mm, the maximum field angle FOV of the optical imaging lens is 49.5 °, the total length TTL of the optical imaging lens is 6.80mm, and the image height ImgH is 3.30 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 concave, and the image-side surface S4 of the second lens element is convex. The third lens element E3 has negative 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 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 7.05mm, the maximum field angle FOV of the optical imaging lens is 49.5 °, the total length TTL of the optical imaging lens is 6.80mm, and the image height ImgH is 3.30 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.6812E-03

1.0119E-04

-1.5791E-03

3.1423E-03

-4.3688E-03

3.8303E-03

-2.1612E-03

S2

-3.3061E-02

8.5136E-02

-9.6892E-02

4.0608E-02

2.8369E-02

-4.8349E-02

3.0304E-02

S3

2.1299E-02

1.4376E-01

-2.7409E-01

3.0041E-01

-2.1530E-01

1.0353E-01

-3.2351E-02

S4

1.6621E-02

1.2196E-01

-2.1590E-01

2.0354E-01

-4.9040E-02

-1.1541E-01

1.5474E-01

S5

-1.2311E-01

9.5630E-02

6.2518E-03

-2.3907E-01

5.7315E-01

-7.8845E-01

7.0527E-01

S6

-1.1132E-01

6.6183E-02

1.4866E-02

-2.1499E-01

5.5543E-01

-8.7195E-01

9.0561E-01

S7

-3.4853E-02

9.8616E-03

1.6157E-01

-5.5111E-01

8.9696E-01

-7.8513E-01

2.0130E-01

S8

-3.9137E-02

8.5493E-02

-5.8722E-02

-6.4906E-02

2.9231E-01

-5.1681E-01

5.5730E-01

S9

-8.2696E-02

-6.2971E-02

6.0608E-01

-2.5009E+00

6.5180E+00

-1.1516E+01

1.4146E+01

S10

-7.5682E-02

3.6913E-02

-9.4636E-03

-1.5890E-01

5.6514E-01

-1.0550E+00

1.2499E+00

S11

-1.6913E-01

1.0751E-01

-7.4374E-02

5.1680E-02

-2.8206E-02

1.0916E-02

-2.8457E-03

S12

-1.8264E-01

1.1044E-01

-6.6546E-02

3.0697E-02

-7.9890E-03

-2.5044E-04

1.0772E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

7.7524E-04

-1.7085E-04

2.1025E-05

-1.1026E-06

0.0000E+00

S2

-1.0798E-02

2.3020E-03

-2.7502E-04

1.4230E-05

0.0000E+00

S3

5.8193E-03

-3.4993E-04

-5.5073E-05

7.8919E-06

0.0000E+00

S4

-9.3991E-02

3.1717E-02

-5.6711E-03

3.9344E-04

6.7904E-06

0.0000E+00

S5

-4.2028E-01

1.6493E-01

-4.0693E-02

5.6522E-03

-3.2155E-04

-2.8638E-06

0.0000E+00

S6

-6.3127E-01

2.9145E-01

-8.5296E-02

1.4297E-02

-1.0432E-03

0.0000E+00

S7

3.1225E-01

-3.8342E-01

1.9711E-01

-5.0792E-02

5.2277E-03

4.6165E-05

0.0000E+00

S8

-3.9152E-01

1.7942E-01

-5.1480E-02

8.3387E-03

-5.7646E-04

0.0000E+00

S9

-1.2178E+01

7.2911E+00

-2.9533E+00

7.6054E-01

-1.0755E-01

4.7565E-03

3.5429E-04

S10

-9.9315E-01

5.3671E-01

-1.9469E-01

4.5326E-02

-6.1095E-03

3.6168E-04

0.0000E+00

S11

4.5847E-04

-3.3752E-05

-1.8042E-06

5.8756E-07

-4.1693E-08

4.9004E-10

4.0019E-11

S12

-4.3585E-04

9.4543E-05

-1.2072E-05

8.1652E-07

-1.1660E-08

-1.9071E-09

8.9116E-11

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.

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

-1.7960E-03

3.1932E-04

-1.8259E-03

3.1505E-03

-4.1502E-03

3.6074E-03

-2.0547E-03

S2

-4.2372E-02

1.2726E-01

-1.9078E-01

1.7280E-01

-9.7916E-02

3.5018E-02

-7.6092E-03

S3

1.2506E-02

2.0207E-01

-4.2069E-01

5.2673E-01

-4.4856E-01

2.6790E-01

-1.1163E-01

S4

1.4393E-02

1.5166E-01

-2.9768E-01

3.3775E-01

-1.9193E-01

-1.5288E-02

1.0943E-01

S5

-1.3157E-01

1.0695E-01

1.3811E-02

-3.1705E-01

7.7067E-01

-1.0781E+00

9.7958E-01

S6

-1.2170E-01

7.5735E-02

3.4262E-02

-3.3638E-01

8.6854E-01

-1.3697E+00

1.4280E+00

S7

-3.9915E-02

3.3591E-02

6.8818E-02

-2.2277E-01

9.1158E-02

5.5323E-01

-1.3181E+00

S8

-4.3867E-02

8.1055E-02

2.8935E-02

-3.9697E-01

1.0383E+00

-1.6264E+00

1.6829E+00

S9

-8.5849E-02

-6.3916E-02

5.8660E-01

-2.3208E+00

5.8909E+00

-1.0250E+01

1.2487E+01

S10

-7.7536E-02

3.6312E-02

-1.2939E-02

-1.2083E-01

4.4970E-01

-8.5860E-01

1.0341E+00

S11

-1.6955E-01

1.0225E-01

-6.3746E-02

3.8488E-02

-1.7327E-02

4.7673E-03

-4.2420E-04

S12

-1.8380E-01

1.0784E-01

-6.1776E-02

2.5690E-02

-4.6514E-03

-1.7481E-03

1.5468E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

7.4870E-04

-1.6793E-04

2.1040E-05

-1.1233E-06

0.0000E+00

S2

8.3359E-04

6.8324E-06

-1.2365E-05

9.9264E-07

0.0000E+00

S3

3.1518E-02

-5.6942E-03

5.8832E-04

-2.6172E-05

0.0000E+00

S4

-8.1598E-02

3.0025E-02

-5.6446E-03

4.0635E-04

6.8747E-06

0.0000E+00

S5

-5.9266E-01

2.3625E-01

-5.9289E-02

8.3926E-03

-4.8683E-04

-4.7694E-06

0.0000E+00

S6

-9.9906E-01

4.6328E-01

-1.3635E-01

2.3021E-02

-1.6954E-03

0.0000E+00

S7

1.4899E+00

-9.9410E-01

3.9823E-01

-8.7958E-02

7.7995E-03

1.5031E-04

0.0000E+00

S8

-1.1737E+00

5.4545E-01

-1.6168E-01

2.7599E-02

-2.0607E-03

0.0000E+00

S9

-1.0710E+01

6.4091E+00

-2.6030E+00

6.7537E-01

-9.7481E-02

4.8158E-03

2.5484E-04

S10

-8.3214E-01

4.5413E-01

-1.6599E-01

3.8874E-02

-5.2632E-03

3.1259E-04

0.0000E+00

S11

-2.0720E-04

9.2110E-05

-1.7541E-05

1.7715E-06

-8.1115E-08

-1.3243E-10

1.0352E-10

S12

-5.4056E-04

1.1104E-04

-1.3830E-05

9.2759E-07

-1.3850E-08

-2.0863E-09

9.8628E-11

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 concave, and the image-side surface S4 of the second lens element is convex. The third lens element E3 has negative 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 7.15mm, the maximum field angle FOV of the optical imaging lens is 51.1 °, the total length TTL of the optical imaging lens is 6.81mm, and the image height ImgH is 3.47 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.

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 concave, and the image-side surface S4 of the second lens element is convex. The third lens element E3 has negative 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 concave, and the image-side surface S10 of the fifth lens element is convex. 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 7.16mm, the maximum field angle FOV of the optical imaging lens is 49.8 °, the total length TTL of the optical imaging lens is 6.80mm, and the image height ImgH is 3.37 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.

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.

In summary, the first to fifth examples respectively satisfy the relationships shown in table 11.

Conditions/examples	1	2	3	4	5
						f/EPD	1.86	1.86	1.86	1.87	1.90
(f2+f4)/f3	0.22	0.66	0.78	0.61	1.82
						f5/(f+f1)	1.18	1.51	1.48	1.57	1.49
(R2-R1)/(R2+R1)	1.10	1.33	1.33	1.30	1.58
						(R5+R6)/f	1.36	1.05	1.02	1.01	1.14
DT11/DT31	1.18	1.20	1.21	1.22	1.30
						(DT61+DT62)/ImgH	1.52	1.56	1.56	1.49	1.53
f123/(CT1+CT2+CT3)	3.28	3.05	3.07	2.87	3.16
						TTL/T56	4.75	5.23	5.27	4.95	4.53
SAG52/SAG51	1.27	1.33	1.33	1.22	1.42
						(ET2+ET4)/(CT2+CT4)	2.46	2.18	2.16	2.17	1.99
(SAG61+SAG62)/ET6	-8.56	-6.78	-6.73	-6.88	-7.40

TABLE 11

Table 12 shows the effective focal lengths f of the optical imaging lenses of the first to fifth embodiments, and the effective focal lengths f1 to f6 of the respective lenses.

TABLE 12

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

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

the lens comprises a first lens, a second lens and a third lens, wherein the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface;

a second lens having a negative optical power;

the third lens has negative 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 negative focal power, an object side surface of the fourth lens being a concave surface;

a fifth lens having a positive optical power;

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

wherein the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.5< f123/(CT1+ CT2+ CT3) < 3.5.

2. The optical imaging lens of claim 1, wherein an effective focal length f of the optical imaging lens and an entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.95.

3. The optical imaging lens of claim 1, wherein the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy: 0.1< (f2+ f4)/f3< 2.0.

4. The optical imaging lens of claim 1, wherein the effective focal length f5 of the fifth lens, the effective focal length f of the optical imaging lens, and the effective focal length f1 of the first lens satisfy: 1.0< f5/(f + f1) < 1.7.

5. The optical imaging lens of claim 1, wherein a radius of curvature R2 of the image side surface of the first lens and a radius of curvature R1 of the object side surface of the first lens satisfy: 1.0< (R2-R1)/(R2+ R1) < 1.7.

6. The optical imaging lens of claim 1, wherein a radius of curvature R6 of the image side surface of the third lens and a radius of curvature R5 of the object side surface of the third lens and an effective focal length f of the optical imaging lens satisfy: 0.8< (R5+ R6)/f < 1.5.

7. The optical imaging lens of claim 1, wherein the effective half aperture DT11 of the object side surface of the first lens and the effective half aperture DT31 of the object side surface of the third lens satisfy: 1.0< DT11/DT31< 1.5.

8. The optical imaging lens of claim 1, wherein an effective half aperture DT61 of the object side surface of the sixth lens, an effective half aperture DT62 of the image side surface of the sixth lens, and a half ImgH of a diagonal length of an effective pixel area on an imaging surface of the optical imaging lens satisfy: 1.2< (DT61+ DT62)/ImgH < 1.7.

9. 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 air interval T56 between the fifth lens element and the sixth lens element on the optical axis of the optical imaging lens satisfy: 4.2< TTL/T56< 5.4.

10. The optical imaging lens of claim 1, wherein an on-axis distance SAG51 between an intersection point of an object-side surface of the fifth lens and an optical axis of the optical imaging lens 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: 1.1< SAG52/SAG51< 1.6.

11. The optical imaging lens of claim 1, wherein the edge thickness ET2 of the second lens, the edge thickness ET4 of the fourth lens, the center thickness CT2 of the second lens, and the center thickness CT4 of the fourth lens satisfy: 1.8< (ET2+ ET4)/(CT2+ CT4) < 2.7.

12. The optical imaging lens of claim 1, wherein an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and an optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the sixth lens, an on-axis distance SAG62 between an intersection point of an image-side surface of the sixth lens and the optical axis and an effective radius vertex of the image-side surface of the sixth lens and an edge thickness ET6 of the sixth lens satisfy: -9< (SAG61+ SAG62)/ET6< -6.