CN114047605B

CN114047605B - Optical imaging lens

Info

Publication number: CN114047605B
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: 2024-04-19
Anticipated expiration: 2041-12-02
Also published as: CN114047605A

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: the first lens with negative focal power is concave on the object side; a second lens having optical power, the image-side surface being concave; a diaphragm; a third lens having optical power; a fourth lens with negative focal power, the object side surface of which is a concave surface; a fifth lens element with optical power, wherein an image-side surface of the fifth lens element is convex; a sixth lens having optical power; wherein the first lens is a glass aspheric lens; the on-axis distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens and the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: (SAG61+SAG62)/(SAG 61-SAG 62) < 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 adaptation capability and large shooting range and is difficult to consider simultaneously.

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 technology, the public generally tends to replace the traditional camera with the photographing function of the mobile phone, so that the photographing quality of the mobile phone is promoted to become a big selling point of the smart phone, the high-quality optical imaging lens of the mobile phone is required to take high-quality photos and is also suitable for different photographing environments, such as extreme thunderstorm weather or high-low temperature weather, etc., the optical imaging lens in the prior art generally consists of a common plastic lens, the photographing quality is often poor when the temperature is very low or the temperature is very high, and the performance of the lens made of glass materials is satisfactory in the environments. Meanwhile, the shooting range of the optical imaging lens is smaller, and the requirements of users are difficult to meet.

That is, the optical imaging lens in the prior art has the problems of high image quality, high adaptability to high and low temperature environment and large shooting range, which are difficult to be simultaneously combined.

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens, which solves the problems that the optical imaging lens in the prior art has high image quality, high and low temperature environment adaptation capability and large shooting range and is difficult to take into account.

In order to achieve the above object, according to one 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: the first lens with negative focal power is concave on the object side; a second lens having optical power, the image-side surface being concave; a diaphragm; a third lens having optical power; a fourth lens with negative focal power, the object side surface of which is a concave surface; a fifth lens element with optical power, wherein an image-side surface of the fifth lens element is convex; a sixth lens having optical power; wherein the first lens is a glass aspheric lens; the on-axis distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens and the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: (SAG61+SAG62)/(SAG 61-SAG 62) < 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, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL/ImgH < 1.8.

Further, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -7.0 < (R1-R2)/(R1+R2) is less than or equal to-2.0.

Further, 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 to an effective radius vertex of the object side surface of the first lens satisfies: ET1/SAG11 is less than or equal to 2.0 and less than 3.0.

Further, the air space T12 on the optical axis of the first lens and the second lens, the air space T23 on the optical axis of the second lens and the third lens, the air space T34 on the optical axis of the third lens and the fourth lens, and the air space T45 on the optical axis of the fourth lens and the fifth lens satisfy: the (T12+T23)/(T34+T45) is less 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, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 3.0 < (R11+R12)/(R11-R12) < 8.0.

Further, an on-axis distance SAG52 between the center thickness CT5 of the fifth lens on the optical axis and 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 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: the first lens with negative focal power is concave on the object side; a second lens having optical power, the image-side surface being concave; a diaphragm; a third lens having optical power; a fourth lens with negative focal power, the object side surface of which is a concave surface; a fifth lens element with optical power, wherein an image-side surface of the fifth lens element 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: FOV >120 °; 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 SAG61 between an intersection point of the 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 the 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: (SAG61+SAG62)/(SAG 61-SAG 62) < 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 the focal power, a diaphragm, a third lens with the focal power, a fourth lens with the negative focal power, a fifth lens with the focal power and a sixth lens with the focal power from the object side to the image side along the 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; the on-axis distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens and the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: (SAG61+SAG62)/(SAG 61-SAG 62) < 5.0.

The optical power and the surface shape of each lens are reasonably distributed, so that the wide angle characteristic of the optical imaging lens is realized, the shooting range is enlarged, the sensitivity can be effectively reduced, and the image quality is improved. The first lens is a glass aspheric lens, so that the temperature drift can be effectively controlled, the optical imaging lens can adapt to high and low temperature environments, and the imaging quality is improved. By restricting the relation between the on-axis distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens and the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens within a reasonable range, the processing characteristics of the sixth lens can be ensured, and the assembly of the optical imaging lens is facilitated.

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, the glass aspheric lens is added, so that the imaging quality can be improved, and the imaging lens can adapt to high and low temperature environments; thirdly, the large aperture has better image quality in a darker environment; fourth, ultra-thin, the whole volume of optical imaging lens is less, improve the aesthetic measure.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 is a schematic view showing the structure of an optical imaging lens according to an example one of the present invention;

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

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

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

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

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

fig. 13 is a schematic view showing the structure 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 magnification chromatic aberration curve of the optical imaging lens in fig. 13, respectively;

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

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

Fig. 21 is a schematic diagram showing the structure of 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 magnification chromatic aberration curve of the optical imaging lens in fig. 21, respectively.

Wherein the above figures include the following reference numerals:

E1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; STO and diaphragm; e3, a third lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; e4, a fourth lens; s7, an object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; e5, a fifth lens; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens; e6, a sixth lens; s11, an object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, an optical filter; s13, the object side surface of the optical filter; s14, an image side surface of the optical filter; s15, an imaging surface.

Detailed Description

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

It is noted that 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 unless otherwise indicated.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.

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

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region may be based on the determination by a person of ordinary skill in the art by determining the presence or absence of a concave-convex with an R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lensdata) in optical software). In 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 image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

The invention provides an optical imaging lens, which aims to solve the problems that the optical imaging lens in the prior art has high image quality, high adaptability to high and low temperature environments and large shooting range and is difficult to take into consideration.

Example 1

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 optical power, a second lens having optical power, a stop, a third lens having optical power, a fourth lens having negative optical power, a fifth lens having optical power, and a sixth lens having optical 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 on-axis distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens and the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: (SAG61+SAG62)/(SAG 61-SAG 62) < 5.0.

Preferably, the method comprises: (SAG61+SAG62)/(SAG 61-SAG 62) < 4.9.

In the present embodiment, the maximum field angle FOV of the optical imaging lens satisfies: FOV >120 °. The maximum field angle FOV of the optical imaging lens is reasonably restricted within a certain range, so that the characteristic of a wide angle can be met, the obtained object information is effectively enlarged, and the shooting range is enlarged. Preferably, FOV >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 characteristic of a large aperture can be realized by restraining the ratio between the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens in a reasonable range, so that the optical imaging lens can have better image quality in a dark light environment. Preferably, f/EPD < 2.3.

In this embodiment, the on-axis distance TTL from the object side surface to the imaging surface of the first lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL/ImgH < 1.8. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal line length of the effective pixel area on the imaging surface is in a reasonable range, so that the whole optical imaging lens has a small volume, the miniaturization is ensured, and the appearance attractiveness of the optical imaging lens is improved. Preferably, TTL/ImgH < 1.7.

In the present embodiment, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -7.0 < (R1-R2)/(R1+R2) is less than or equal to-2.0. The bending degree of the first lens can be controlled by meeting the conditional expression, and the first lens has better forming and processing characteristics on the basis of guaranteeing the wide-angle characteristics of the optical imaging lens. Preferably, -6.8 < (R1-R2)/(R1+R2) < 2.0.

In the present embodiment, the on-axis distance SAG11 between the edge thickness ET1 of the first lens and the vertex of the effective radius of the object side of the first lens from the intersection point of the object side of the first lens and the optical axis is as follows: ET1/SAG11 is less than or equal to 2.0 and less than 3.0. The edge thickness of the first lens can be controlled to enable the first lens to have good molding processing characteristics when the conditional expression is satisfied. Preferably, 2.0.ltoreq.ET 1/SAG11 < 2.8.

In the present embodiment, the air space T12 on the optical axis of the first lens and the second lens, the air space T23 on the optical axis of the second lens and the third lens, the air space T34 on the optical axis of the third lens and the fourth lens, and the air space T45 on the optical axis of the fourth lens and the fifth lens satisfy: the (T12+T23)/(T34+T45) is less than or equal to 2.0 and less than 3.0. The space between the lenses can be reasonably distributed by meeting the conditional expression, the aberration is reduced, and meanwhile, the assembly property is improved. Preferably, 2.0.ltoreq.T12+T23)/(T34+T45) < 2.8.

In the present embodiment, the curvature radius 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. The curvature and the focal power of the fourth lens can be ensured by meeting the conditional expression, the molding processability of the fourth lens can be increased, and meanwhile, the aberration is reduced. Preferably, 0.8 < R7/f4 < 3.6.

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

In the present embodiment, an on-axis distance SAG52 between the center thickness CT5 of the fifth lens on the optical axis and the point of intersection 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. The center thickness of the fifth lens can be ensured by satisfying this conditional expression, and the molding processability of the fifth lens can be improved. Preferably, -1.8 < CT5/SAG52 < -1.5.

In the present embodiment, the curvature radius 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. The curvature and the focal power of the third lens can be ensured by meeting the conditional expression, the molding processability of the third lens can be improved, and meanwhile, the aberration is 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 optical power, a second lens having optical power, a stop, a third lens having optical power, a fourth lens having negative optical power, a fifth lens having optical power, and a sixth lens having optical 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: FOV >120 °; 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.

Preferably, FOV >123.5 °.

Preferably, f/EPD < 2.3.

The optical power and the surface shape of each lens are reasonably distributed, so that the wide angle characteristic of the optical imaging lens is realized, the shooting range is enlarged, the sensitivity can be effectively reduced, and the image quality is improved. The first lens is a glass aspheric lens, so that the temperature drift can be effectively controlled, the optical imaging lens can adapt to high and low temperature environments, and the imaging quality is improved. The maximum field angle FOV of the optical imaging lens is reasonably restricted within a certain range, so that the characteristic of a wide angle can be met, the obtained object information is effectively enlarged, and the shooting range is enlarged. The characteristic of a large aperture can be realized by restraining the ratio between the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens in a reasonable range, so that the optical imaging lens can have better image quality in a dark light environment.

In the present embodiment, an on-axis distance SAG61 between an intersection point of the 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 the 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: (SAG61+SAG62)/(SAG 61-SAG 62) < 5.0. By restricting the relation between the on-axis distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the effective radius vertex of the object side surface of the sixth lens and the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens within a reasonable range, the processing characteristics of the sixth lens can be ensured, and the assembly of the optical imaging lens is facilitated. Preferably, the method comprises: (SAG61+SAG62)/(SAG 61-SAG 62) < 4.9.

The optical imaging lens may optionally further 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 six lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability 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 and the like. 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 aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the technical solution claimed in the present application. For example, although six lenses are described as an example 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, if desired.

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

Any 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 according to an example one 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 sequentially includes, 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 imaging surface S15.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an 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. 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, half of the maximum field angle Semi-FOV 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 3.03mm.

Table 1 shows a basic structural parameter table of an optical imaging lens of example one, in which the units of radius of curvature, thickness/distance, focal length, and 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 to the sixth lens element E6 are aspheric, and the surface shape of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients 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 indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 3 shows an astigmatism curve of the optical imaging lens of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4 shows a magnification chromatic aberration curve of the optical imaging lens of example one, 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 fig. 4, the optical imaging lens according to the example one 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, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of an optical imaging lens structure of example two.

As shown in fig. 5, the optical imaging lens sequentially includes, 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 imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.88mm, half of the maximum field angle Semi-FOV 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 3.03mm.

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

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

TABLE 4 Table 4

Fig. 6 shows an on-axis chromatic aberration curve of the optical imaging lens of example two, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 7 shows an astigmatism curve of the optical imaging lens of example two, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8 shows a magnification chromatic aberration curve of the optical imaging lens of example two, 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. 6 to 8, the optical imaging lens provided in the second example can achieve good imaging quality.

Example three

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 sequentially includes, 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 imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.94mm, half of the maximum field angle Semi-FOV 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 3.03mm.

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

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the 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 indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 11 shows an astigmatism curve of the optical imaging lens of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12 shows a magnification chromatic aberration curve of the optical imaging lens of example three, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 10 to 12, the optical imaging lens given in example three 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 sequentially includes, 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 imaging surface S15.

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 of the sixth lens element is convex, and an 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. 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, half of the maximum field angle Semi-FOV 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 3.03mm.

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

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

TABLE 8

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

As can be seen from fig. 14 to 16, the optical imaging lens provided in 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 sequentially includes, 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 imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.87mm, half of the maximum field angle Semi-FOV 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 3.03mm.

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

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Table 10

Fig. 18 shows an on-axis chromatic aberration curve of the optical imaging lens of example five, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 19 shows an astigmatism curve of the optical imaging lens of example five, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 20 shows a magnification chromatic aberration curve of the optical imaging lens of example five, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 18 to 20, the optical imaging lens provided in 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 sequentially includes, 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 imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.88mm, half of the maximum field angle Semi-FOV 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 3.03mm.

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

TABLE 11

Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example six, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

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 indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens. Fig. 23 shows an astigmatism curve of an optical imaging lens of example six, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a magnification chromatic aberration 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 given in example six can achieve good imaging quality.

In summary, examples one to six satisfy the relationships shown in table 13, respectively.

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

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

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated 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 the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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:

the first lens with negative focal power is concave on the object side;

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

A diaphragm;

a third lens having positive optical power;

A fourth lens with negative focal power, the object side surface of which is a concave surface;

A fifth lens element with positive refractive power having a convex image-side surface;

A sixth lens having negative optical power;

wherein the first lens is a glass aspheric lens; an on-axis distance SAG61 between an intersection point of the 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 the 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: (SAG61+SAG62)/(SAG 61-SAG 62) < 5.0; the maximum field angle FOV of the optical imaging lens satisfies: FOV >123.5 °; an on-axis distance TTL from an object side surface of the first lens to an imaging surface and a half of a diagonal length ImgH of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.7; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: (R11+R12)/(R11-R12) is less than or equal to 5.67 and less than or equal to 7.45.

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 < 2.5.

3. The optical imaging lens of claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: -7.0 < (R1-R2)/(R1+R2) is less than or equal to-2.0.

4. The optical imaging lens as claimed in 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 to an effective radius vertex of the object side surface of the first lens is as follows: ET1/SAG11 is less than or equal to 2.0 and less than 3.0.

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

6. The optical imaging lens of claim 1, wherein a radius of curvature R7 of an 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.

7. The optical imaging lens according to claim 1, wherein an on-axis distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and 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 satisfies: -2.0 < CT5/SAG52 < -1.5.

8. The optical imaging lens of claim 1, wherein a radius of curvature R5 of an object side surface of the third lens and an effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5.

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

the first lens with negative focal power is concave on the object side;

A diaphragm;

a third lens having positive optical power;

A sixth lens having negative optical power;

Wherein the first lens is a glass aspheric lens; the maximum field angle FOV of the optical imaging lens satisfies: FOV >123.5 °; 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; an on-axis distance TTL from an object side surface of the first lens to an imaging surface and a half of a diagonal length ImgH of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.7; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: (R11+R12)/(R11-R12) is less than or equal to 5.67 and less than or equal to 7.45.

10. The optical imaging lens of claim 9, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: -7.0 < (R1-R2)/(R1+R2) is less than or equal to-2.0.

11. The optical imaging lens as claimed in claim 9, wherein an on-axis distance SAG11 between an intersection of the edge thickness ET1 of the first lens and the object side of the first lens and the optical axis to an effective radius vertex of the object side of the first lens is: ET1/SAG11 is less than or equal to 2.0 and less than 3.0.

12. The optical imaging lens according to claim 9, wherein an air space T12 of the first lens and the second lens on the optical axis, an air space T23 of the second lens and the third lens on the optical axis, an air space T34 of the third lens and the fourth lens on the optical axis, and an air space T45 of the fourth lens and the fifth lens on the optical axis satisfy: the (T12+T23)/(T34+T45) is less than or equal to 2.0 and less than 3.0.

13. The optical imaging lens of claim 9, wherein a radius of curvature R7 of an 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.

14. The optical imaging lens according to claim 9, wherein an on-axis distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and 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 satisfies: -2.0 < CT5/SAG52 < -1.5.

15. The optical imaging lens of claim 9, wherein a radius of curvature R5 of an object side surface of the third lens and an effective focal length f3 of the third lens satisfy: r5/f3 is more than 1.0 and less than 1.5.