CN114047605A

CN114047605A - Optical imaging lens

Info

Publication number: CN114047605A
Application number: CN202111467715.4A
Authority: CN
Inventors: 李洋; 王浩; 邢天祥; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-02-15
Anticipated expiration: 2041-12-02
Also published as: CN114047605B

Abstract

The invention provides an optical imaging lens. The optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative refractive power, the object side surface being concave; a second lens having a refractive power, the image-side surface being concave; a diaphragm; a third lens having optical power; a fourth lens having a negative refractive power, the object side surface being concave; a fifth lens having a focal power, an image-side surface of which is convex; a sixth lens having optical power; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0. The invention solves the problems that the optical imaging lens in the prior art has high image quality, high and low temperature environment adaptability and large shooting range and is difficult to simultaneously consider.

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 continuous development of science and technology, people generally tend to replace a traditional camera with the photographing function of a mobile phone, so that the photographing quality of the mobile phone is more and more a big selling point of the smart phone, a high-quality optical imaging lens of the mobile phone needs to take a high-quality photo and is also suitable for different photographing environments such as extreme thunderstorm weather or high and low temperature weather, the optical imaging lens in the prior art generally consists of a common plastic lens, the photographing quality is not good when the temperature is low or high, and the performance of a glass lens in the environments is satisfactory. Meanwhile, the shooting range of the optical imaging lens is small, and the requirements of users are difficult to meet.

That is to say, the optical imaging lens in the prior art has the problems of high image quality, capability of adapting to high and low temperature environments, and large shooting range, which are difficult to be compatible at the same time.

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens to solve the problems that the optical imaging lens in the prior art has high image quality, high and low temperature environment adaptability and large shooting range and is difficult to simultaneously consider.

In order to achieve the above object, according to an aspect of the present invention, there is provided an optical imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens having a negative refractive power, the object side surface being concave; a second lens having a refractive power, the image-side surface being concave; a diaphragm; a third lens having optical power; a fourth lens having a negative refractive power, the object side surface being concave; a fifth lens having a focal power, an image-side surface of which is convex; a sixth lens having optical power; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0.

Further, the maximum field angle FOV of the optical imaging lens satisfies: FOV > 120.

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 < 2.5.

Further, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.8.

Further, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0.

Further, the axial distance SAG11 between the intersection point of the edge thickness ET1 of the first lens and the object side surface and the optical axis of the first lens and the effective radius vertex of the object side surface of the first lens satisfies the following conditions: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0.

Further, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0.

Further, the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0.

Further, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0.

Further, the on-axis distance SAG52 between the central thickness CT5 of the fifth lens on the optical axis and the intersection point of the image-side surface of the fifth lens and the optical axis to the effective radius vertex of the image-side surface of the fifth lens satisfies: 2.0 < CT5/SAG52 < -1.5.

Further, the radius of curvature R5 of the object-side surface of the third lens and the effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5.

According to another aspect of the present invention, there is provided an optical imaging lens, comprising, in order from an object side to an image side along an optical axis: a first lens having a negative refractive power, the object side surface being concave; a second lens having a refractive power, the image-side surface being concave; a diaphragm; a third lens having optical power; a fourth lens having a negative refractive power, the object side surface being concave; a fifth lens having a focal power, an image-side surface of which is convex; a sixth lens having optical power; wherein, the first lens is a glass aspheric lens; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: FOV >120 °; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: f/EPD < 2.5.

Further, 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 and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0.

By applying the technical scheme of the invention, the optical imaging lens sequentially comprises a first lens with negative focal power, a second lens with focal power, a diaphragm, a third lens with focal power, a fourth lens with negative focal power, a fifth lens with focal power and a sixth lens with focal power from an object side to an image side along an optical axis; the object side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a concave surface; the image side surface of the fifth lens is a convex surface; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0.

Through the reasonable distribution of the focal power and the surface type of each lens, the wide-angle characteristic of the optical imaging lens can be realized, the shooting range can be enlarged, and through the reasonable distribution of the focal power of each lens, the sensitivity can be effectively reduced, and the image quality can be improved. First lens are glass aspheric lens, can effectively control the temperature drift like this for optical imaging camera lens can adapt to high low temperature's environment, improves the imaging quality simultaneously. By constraining the relation between the on-axis distance SAG61 from the intersection point of the object-side surface of the sixth lens and the optical axis to the effective radius vertex of the object-side surface of the sixth lens and the on-axis distance SAG62 from the intersection point of the image-side surface of the sixth lens and the optical axis to the effective radius vertex of the image-side surface of the sixth lens to be within a reasonable range, the processing characteristics of the sixth lens can be ensured, and the optical imaging lens is favorably assembled.

In addition, the optical imaging lens of the application mainly has four characteristics: firstly, compared with a common lens, the wide-angle optical imaging lens has a wider shooting range; secondly, a glass aspheric lens is added, so that the imaging quality can be improved, and the imaging device can adapt to high and low temperature environments; thirdly, the large aperture can have better image quality in a darker environment; fourthly, the optical imaging lens is ultra-thin, the whole volume of the optical imaging lens is small, and the attractiveness is improved.

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 view showing an optical imaging lens according to a first example of the present invention;

fig. 2 to 4 respectively show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging lens in fig. 1;

fig. 5 is a schematic view showing a configuration of an optical imaging lens according to a second example of the present invention;

fig. 6 to 8 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging lens in fig. 5, respectively;

fig. 9 is a schematic structural view showing an optical imaging lens of example three of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging lens in fig. 9, respectively;

fig. 13 is a schematic view showing a configuration of an optical imaging lens of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 13;

fig. 17 is a schematic structural view showing an optical imaging lens of example five of the present invention;

fig. 18 to 20 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 17;

fig. 21 is a schematic structural view showing an optical imaging lens of example six of the present invention;

fig. 22 to 24 show an on-axis chromatic aberration curve, an astigmatism 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:

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; STO, stop; 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, optical filters; s13, the object side surface of the optical filter; s14, the image side surface of the optical filter; 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 problems that the optical imaging lens in the prior art has high image quality, high and low temperature environment adaptability and large shooting range and is difficult to simultaneously take into consideration.

Example one

As shown in fig. 1 to 24, the optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens having negative power, a second lens having power, a stop, a third lens having power, a fourth lens having negative power, a fifth lens having power, and a sixth lens having power; the object side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a concave surface; the image side surface of the fifth lens is a convex surface; wherein, the first lens is a glass aspheric lens; an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0.

Preferably, the following components: 2.0-4.9 of (SAG61+ SAG62)/(SAG61-SAG 62).

In the present embodiment, the maximum field angle FOV of the optical imaging lens satisfies: FOV > 120. By reasonably restricting the maximum field angle FOV of the optical imaging lens within a certain range, the wide-angle characteristic can be met, the obtained object information is effectively expanded, and the shooting range is expanded. Preferably, the FOV is >123.5 °.

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 < 2.5. The ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is restricted within a reasonable range, so that the characteristic of a large aperture can be realized, and the optical imaging lens can have better image quality in a dark environment. Preferably, f/EPD < 2.3.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.8. The ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface is restrained within a reasonable range, so that the optical imaging lens has a small size as a whole, the characteristic of miniaturization is guaranteed, and the appearance attractiveness of the optical imaging lens is improved. Preferably, TTL/ImgH < 1.7.

In the present embodiment, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0. The method satisfies the conditional expression, can control the bending degree of the first lens, and ensures the first lens to have better molding processing characteristics on the basis of ensuring the wide-angle characteristic of the optical imaging lens. Preferably-6.8 < (R1-R2)/(R1+ R2) ≦ -2.0.

In the embodiment, the on-axis distance SAG11 from the intersection point of the edge thickness ET1 of the first lens and the object side surface and the optical axis of the first lens to the effective radius vertex of the object side surface of the first lens satisfies the following condition: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0. Satisfying the condition, the edge thickness of the first lens can be controlled, and the first lens has better molding processing characteristics. Preferably, 2.0. ltoreq. ET1/SAG11 < 2.8.

In the present embodiment, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0. Satisfying this conditional expression, can rationally distribute the interval between each lens, reduce the aberration and improve the assemblability simultaneously. Preferably, 2.0 ≦ (T12+ T23)/(T34+ T45) < 2.8.

In the present embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0. Satisfying the conditional expression, the curvature and the focal power of the fourth lens can be ensured, the molding processability of the fourth lens can be improved, and the aberration can be reduced. Preferably, 0.8 < R7/f4 < 3.6.

In the present embodiment, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0. Satisfying the conditional expression, the curvature and the focal power of the sixth lens can be ensured, the molding processability of the sixth lens can be improved, and the aberration can be reduced. Preferably 3.2 < (R11+ R12)/(R11-R12) < 7.5.

In the present embodiment, the on-axis distance SAG52 between the central thickness CT5 of the fifth lens on the optical axis and the intersection point of the image-side surface of the fifth lens and the optical axis to the effective radius vertex of the image-side surface of the fifth lens satisfies: 2.0 < CT5/SAG52 < -1.5. Satisfying this conditional expression, the center thickness of the fifth lens can be ensured, and the molding processability of the fifth lens can be improved. Preferably, -1.8 < CT5/SAG52 < -1.5.

In the present embodiment, the radius of curvature R5 of the object-side surface of the third lens and the effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5. Satisfying the conditional expression, the curvature and the focal power of the third lens can be ensured, the molding processability of the third lens can be improved, and the aberration can be reduced. Preferably, 1.1 < R5/f3 < 1.3.

Example two

As shown in fig. 1 to 24, the optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens having negative power, a second lens having power, a stop, a third lens having power, a fourth lens having negative power, a fifth lens having power, and a sixth lens having power; the object side surface of the first lens is a concave surface; the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a concave surface; the image side surface of the fifth lens is a convex surface; wherein, the first lens is a glass aspheric lens; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: FOV >120 °; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: f/EPD < 2.5.

Preferably, the FOV is >123.5 °.

Preferably, f/EPD < 2.3.

Through the reasonable distribution of the focal power and the surface type of each lens, the wide-angle characteristic of the optical imaging lens can be realized, the shooting range can be enlarged, and through the reasonable distribution of the focal power of each lens, the sensitivity can be effectively reduced, and the image quality can be improved. First lens are glass aspheric lens, can effectively control the temperature drift like this for optical imaging camera lens can adapt to high low temperature's environment, improves the imaging quality simultaneously. By reasonably restricting the maximum field angle FOV of the optical imaging lens within a certain range, the wide-angle characteristic can be met, the obtained object information is effectively expanded, and the shooting range is expanded. The ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is restricted within a reasonable range, so that the characteristic of a large aperture can be realized, and the optical imaging lens can have better image quality in a dark environment.

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 and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0. By constraining the relation between the on-axis distance SAG61 from the intersection point of the object-side surface of the sixth lens and the optical axis to the effective radius vertex of the object-side surface of the sixth lens and the on-axis distance SAG62 from the intersection point of the image-side surface of the sixth lens and the optical axis to the effective radius vertex of the image-side surface of the sixth lens to be within a reasonable range, the processing characteristics of the sixth lens can be ensured, and the optical imaging lens is favorably assembled. Preferably, the following components: 2.0-4.9 of (SAG61+ SAG62)/(SAG61-SAG 62).

The above-described optical imaging lens may further optionally include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.

The optical imaging lens in the present application may employ a plurality of lenses, for example, the above-described 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 left side is the object side and the right side is the image side.

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.

It should be noted that any one of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 4, an optical imaging lens of the first example of the present application is described. Fig. 1 shows a schematic diagram of an optical imaging lens structure of example one.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, 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 negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive 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 and the image-side surface S6 of the third lens element are convex. 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. The filter E7 has an object side surface S13 of the filter and an image side surface 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 this example, the total effective focal length f of the optical imaging lens is 2.23mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 61.8 °, the total length TTL of the optical imaging lens is 5.10mm, and the image height ImgH is 3.03 mm.

Table 1 shows a basic structural parameter table of the optical imaging lens of example one, 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 example, 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 gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each of the aspherical mirrors S1-S12 in example one.

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the optical imaging lens of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 3 shows astigmatism curves of the optical imaging lens of example one, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows a chromatic aberration of magnification curve of the optical imaging lens of the first example, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens.

As can be seen from fig. 2 to 4, the optical imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, an optical imaging lens of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of the optical imaging lens structure of example two.

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, 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.

In this example, the total effective focal length f of the optical imaging lens is 1.88mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 61.9 °, the total length TTL of the optical imaging lens is 5.00mm, and the image height ImgH is 3.03 mm.

Table 3 shows a basic structural parameter table of the optical imaging lens of example two, 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. 6 shows an on-axis chromatic aberration curve of the optical imaging lens of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 7 shows astigmatism curves of the optical imaging lens of example two, which represent meridional field curvature and sagittal field curvature. Fig. 8 shows a chromatic aberration of magnification curve of the optical imaging lens of example two, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 6 to 8, the optical imaging lens according to the second example can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an optical imaging lens of example three of the present application is described. Fig. 9 shows a schematic diagram of an optical imaging lens structure of example three.

As shown in fig. 9, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, 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.

In this example, the total effective focal length f of the optical imaging lens is 1.94mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 63.5 °, the total length TTL of the optical imaging lens is 5.00mm, and the image height ImgH is 3.03 mm.

Table 5 shows a basic structural parameter table of the optical imaging lens of example three, in which the units of the radius of curvature, thickness/distance, focal length, and 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 example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 6

Fig. 10 shows an on-axis chromatic aberration curve of the optical imaging lens of example three, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 11 shows astigmatism curves of the optical imaging lens of example three, which represent meridional field curvature and sagittal field curvature. Fig. 12 shows a chromatic aberration of magnification curve of the optical imaging lens of example three, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 10 to 12, the optical imaging lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an optical imaging lens of example four of the present application is described. Fig. 13 shows a schematic diagram of an optical imaging lens structure of example four.

As shown in fig. 13, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, 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 negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive 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 and the image-side surface S6 of the third lens element are convex. 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 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. The filter E7 has an object side surface S13 of the filter and an image side surface 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 this example, the total effective focal length f of the optical imaging lens is 1.89mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 63.0 °, the total length TTL of the optical imaging lens is 5.00mm, and the image height ImgH is 3.03 mm.

Table 7 shows a basic structural parameter table of the optical imaging lens of example four, 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 example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 8

Fig. 14 shows on-axis chromatic aberration curves of the optical imaging lens of example four, which represent the deviation of the convergence focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 15 shows astigmatism curves of the optical imaging lens of example four, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows a chromatic aberration of magnification curve of the optical imaging lens of example four, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 14 to 16, the optical imaging lens according to example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an optical imaging lens of example five of the present application is described. Fig. 17 shows a schematic diagram of an optical imaging lens structure of example five.

As shown in fig. 17, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, 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.

In this example, the total effective focal length f of the optical imaging lens is 1.87mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 63.5 °, the total length TTL of the optical imaging lens is 5.05mm, and the image height ImgH is 3.03 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. 18 shows an on-axis chromatic aberration curve of the optical imaging lens of example five, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 19 shows astigmatism curves of the optical imaging lens of example five, which represent meridional field curvature and sagittal field curvature. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging lens of example five, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 18 to 20, the optical imaging lens according to example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an optical imaging lens of example six of the present application is described. Fig. 21 shows a schematic diagram of an optical imaging lens structure of example six.

As shown in fig. 21, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, 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.

In this example, the total effective focal length f of the optical imaging lens is 1.88mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 61.8 °, the total length TTL of the optical imaging lens is 5.10mm, and the image height ImgH is 3.03 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 of the aspherical mirror surfaces in example six, 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

A18

A20

S1

7.1278E-01

-1.3831E-01

3.1221E-02

-9.6380E-03

3.2069E-03

-1.1487E-03

3.8895E-04

-9.8634E-05

7.2718E-06

S2

3.8027E-01

-7.6154E-02

3.5026E-03

1.0302E-03

1.4677E-03

-2.1532E-04

-1.7454E-04

0.0000E+00

S3

6.5908E-02

9.8250E-04

8.0881E-03

3.2016E-03

4.6153E-04

-4.0715E-04

-1.7765E-04

0.0000E+00

S4

5.0843E-02

7.2300E-03

2.6450E-03

7.9889E-04

1.6262E-04

0.0000E+00

S5

7.8860E-03

-1.0907E-03

-1.2795E-05

1.3674E-04

6.8638E-05

3.1793E-05

7.2560E-06

2.9007E-06

0.0000E+00

S6

-1.2961E-01

-3.2764E-03

1.6871E-03

3.2444E-04

0.0000E+00

S7

-1.8240E-01

9.2922E-03

5.4169E-03

1.0329E-03

-3.0528E-04

-1.0736E-04

-2.9575E-05

-1.8132E-05

-1.7459E-05

S8

-1.1861E-01

2.2198E-02

1.7524E-03

1.0493E-03

1.1894E-04

-5.6605E-05

5.5905E-05

0.0000E+00

S9

-1.0535E-02

1.5650E-03

-3.6873E-03

-3.6339E-04

1.3904E-04

-3.5547E-04

8.1751E-05

-2.7087E-05

0.0000E+00

S10

1.2977E-01

1.0961E-01

-2.2412E-02

-3.8639E-05

-1.7422E-03

6.3073E-04

-4.7606E-04

-1.6371E-05

9.1199E-05

S11

-1.7761E+00

2.7571E-01

-2.3054E-02

2.5049E-02

-1.4508E-02

-2.8920E-03

6.8296E-04

3.0625E-03

1.1104E-03

S12

-3.0535E+00

4.2194E-01

-1.3311E-01

5.1440E-02

-1.1152E-02

6.2777E-03

-1.5239E-03

8.1234E-04

-3.6721E-04

TABLE 12

Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging lens of example six, 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 six. Fig. 24 shows a chromatic aberration of magnification curve of the optical imaging lens of example six, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 22 to 24, the optical imaging lens according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Table 13 table 14 gives effective focal lengths f of the optical imaging lenses of example one to example six, effective focal lengths f1 to f6 of the respective lenses, and the like.

Parameter/example	1	2	3	4	5	6
							f(mm)	2.23	1.88	1.94	1.89	1.87	1.88
f1(mm)	-3.70	-3.01	-3.12	-3.03	-2.91	-2.96
							f2(mm)	9.44	5.39	5.80	5.38	5.15	5.52
f3(mm)	2.49	2.63	2.66	2.71	2.66	2.84
							f4(mm)	-3.48	-3.83	-5.02	-6.60	-6.64	-6.02
f5(mm)	2.04	2.19	2.36	2.75	2.68	2.70
							f6(mm)	-4.71	-11.55	-9.08	-16.17	-12.93	-28.09
TTL(mm)	5.10	5.00	5.00	5.00	5.05	5.10
							ImgH(mm)	3.03	3.03	3.03	3.03	3.03	3.03
Semi-FOV(°)	61.8	61.9	63.5	63.0	63.5	61.8

TABLE 14

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 along an optical axis:

a first lens having a negative refractive power, the object side surface being concave;

a second lens having a refractive power, the image-side surface being concave;

a diaphragm;

a third lens having optical power;

a fourth lens having a negative refractive power, the object side surface being concave;

a fifth lens having a focal power, an image-side surface of which is convex;

a sixth lens having optical power;

the first lens is a glass aspheric lens; an on-axis distance SAG61 between an intersection point of an object-side surface of the sixth lens and the optical axis and an effective radius vertex of the object-side surface of the sixth lens and 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 satisfy: 2.0-less (SAG61+ SAG62)/(SAG61-SAG62) < 5.0.

2. The optical imaging lens of claim 1, wherein the maximum field angle FOV of the optical imaging lens satisfies: FOV > 120.

3. 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 < 2.5.

4. 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 satisfies, with ImgH, half a diagonal length of an effective pixel area on the imaging surface: TTL/ImgH is less than 1.8.

5. The optical imaging lens of claim 1, wherein a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 7.0 < (R1-R2)/(R1+ R2) ≦ 2.0.

6. The optical imaging lens of claim 1, wherein an on-axis distance SAG11 between an intersection point of the edge thickness ET1 of the first lens and the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens satisfies: ET1/SAG11 is more than or equal to 2.0 and less than or equal to 3.0.

7. The optical imaging lens according to claim 1, characterized in that an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: (T12+ T23)/(T34+ T45) is more than or equal to 2.0 and less than 3.0.

8. The optical imaging lens of claim 1, wherein a radius of curvature R7 of the object side surface of the fourth lens and an effective focal length f4 of the fourth lens satisfy: r7/f4 is more than 0.5 and less than 4.0.

9. The optical imaging lens of claim 1, wherein a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 3.0 < (R11+ R12)/(R11-R12) < 8.0.

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

a second lens having a refractive power, the image-side surface being concave;

a diaphragm;

a third lens having optical power;

a fifth lens having a focal power, an image-side surface of which is convex;

a sixth lens having optical power;

the first lens is a glass aspheric lens; the maximum field angle FOV of the optical imaging lens satisfies the following conditions: FOV >120 °; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: f/EPD < 2.5.