CN111221108B

CN111221108B - Optical imaging lens

Info

Publication number: CN111221108B
Application number: CN202010162694.4A
Authority: CN
Inventors: 徐标; 张凯元
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2022-02-11
Anticipated expiration: 2038-12-26
Also published as: CN111221107A; CN109491048A; CN111221108A; WO2020134093A1; CN109491048B; CN111308655A; CN111221107B; CN111308655B

Abstract

The application discloses optical imaging lens, this optical imaging lens includes along optical axis from the thing side to the image side in proper order: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a sixth lens having a negative optical power, wherein an effective focal length f1 of the first lens and an effective focal length f6 of the sixth lens satisfy 0.8 ≦ f6|/| f1| < 1.2; and the distance BFL on the optical axis from the image side surface of the sixth lens to the imaging surface of the optical imaging lens and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens satisfy that BFL/TTL is not less than 0.11.

Description

Optical imaging lens

Divisional application

The application is a divisional application of a Chinese patent application with the invention name of 'optical imaging lens' and the application number of 201811600338.5 filed on 26.12.2018.

Technical Field

The present invention relates to an optical imaging lens, and more particularly, to an optical imaging lens including six lenses.

Background

With the development of science and technology, portable electronic products are gradually emerging, and portable electronic products with a camera shooting function are more popular, so that the market demand for an imaging lens suitable for the portable electronic products is gradually increased. On one hand, since portable electronic products such as smart phones tend to be miniaturized, the total length of the lens is limited, thereby increasing the design difficulty of the lens. On the other hand, with the improvement of the performance of a common photosensitive element such as a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), the number of pixels of the photosensitive element is increasing, so that the size of an image plane is increasing, and the requirement for the imaging performance of a matched imaging lens is increasing.

Disclosure of Invention

The present application provides an optical imaging lens applicable to portable electronic products that may solve, at least, or in part, at least one of the above-mentioned disadvantages of the related art.

In one aspect, the present disclosure provides an optical imaging lens, which may include, in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; the sixth lens with negative focal power, wherein the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens can satisfy | f6|/| f1| < 1.2 more than or equal to 0.8; and the distance BFL on the optical axis from the image side surface of the sixth lens to the imaging surface of the optical imaging lens and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens can meet the condition that BFL/TTL is not less than 0.11.

In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy f/EPD < 1.90.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on an optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens may satisfy TTL/ImgH < 1.4.

In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens can satisfy-2.5 < f2/f ≦ -1.6.

In one embodiment, the combined focal length f234 of the second lens, the third lens and the fourth lens and the total effective focal length f of the optical imaging lens can satisfy-3.5 ≦ f234/f ≦ -1.8.

In one embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the optical imaging lens may satisfy-1.7 < f56/f < -1.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy-2 < (R1+ R2)/(R1-R2) < -1.6.

In one embodiment, a central thickness CT1 of the first lens on the optical axis, a separation distance T12 of the first lens and the second lens on the optical axis, a central thickness CT2 of the second lens on the optical axis, and a separation distance T23 of the second lens and the third lens on the optical axis may satisfy 1.35 ≦ CT1/(T12+ CT2+ T23) < 1.6.

In one embodiment, a sum Sigma CT of center thicknesses of the first lens to the sixth lens on the optical axis and a sum Sigma T of a distance separating any adjacent two lenses of the first lens to the sixth lens on the optical axis may satisfy 1.1 < SigmaCT/Sigma T ≦ 1.5.

In one embodiment, a spacing distance T45 between the fourth lens and the fifth lens on the optical axis, a center thickness CT5 between the fifth lens and the sixth lens on the optical axis, a spacing distance T56 between the fifth lens and the sixth lens on the optical axis, and a distance TTL between an object side surface of the first lens and an imaging surface of the optical imaging lens on the optical axis may satisfy 0.3 < (T45+ CT5+ T56)/TTL ≦ 0.4.

In one embodiment, an on-axis distance from an intersection of an object-side surface of the sixth lens and the optical axis to a vertex of an effective radius of the object-side surface of the sixth lens, SAG11, and a center thickness of the sixth lens on the optical axis, CT6, may satisfy-5.3 < SAG11/CT6 ≦ -2.4.

In one embodiment, the maximum effective diameter SD12 of the image-side surface of the sixth lens and the maximum effective diameter SD4 of the image-side surface of the second lens may satisfy 3 < SD12/SD4 < 3.6.

In one embodiment, the on-axis distance SAG1 from the intersection point of the maximum effective diameter SD1 of the object-side surface of the first lens and the object-side surface and the optical axis of the first lens to the apex of the effective radius of the object-side surface of the first lens may satisfy 2 ≦ SD1/SAG1 < 2.2.

In one embodiment, the distance TTL from the object side surface of the first lens element to the imaging surface of the optical imaging lens on the optical axis, the aperture value Fno of the optical imaging lens, and the half length ImgH of the diagonal line of the effective pixel area on the imaging surface of the optical imaging lens satisfy TTL × Fno/ImgH < 2.5.

This application has adopted six lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical lens group has at least one beneficial effect such as miniaturization, ultra-thin, big image plane, large aperture, high imaging quality.

Drawings

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

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

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

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

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

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

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

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

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

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

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

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

fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 6;

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

fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging lens of embodiment 7;

fig. 15 is a schematic structural view showing an optical imaging lens according to embodiment 8 of the present application;

fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging lens of embodiment 8;

fig. 17 is a schematic structural view showing an optical imaging lens according to embodiment 9 of the present application;

fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging lens of embodiment 9;

fig. 19 is a schematic structural view showing an optical imaging lens according to embodiment 10 of the present application;

fig. 20A to 20D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 10;

fig. 21 is a schematic structural view showing an optical imaging lens according to embodiment 11 of the present application;

fig. 22A to 22D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 11.

Detailed Description

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

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

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

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

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

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

The optical imaging lens according to an exemplary embodiment of the present application may include, for example, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged in order from the object side to the image side along the optical axis. Any adjacent two lenses among the first to sixth lenses may have an air space therebetween.

In an exemplary embodiment, the first lens may have a positive optical power, and the object side surface thereof may be convex and the image side surface thereof may be concave; the second lens can have negative focal power, and the image side surface of the second lens can be concave; the third lens has positive focal power or negative focal power, the object side surface of the third lens can be a convex surface, and the image side surface of the third lens can be a concave surface; the fourth lens has positive focal power or negative focal power, and the object side surface of the fourth lens can be a concave surface; the fifth lens element has positive focal power, and has a convex object-side surface and a concave image-side surface; the sixth lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface.

The focal power of the first lens is reasonably controlled, so that the aberration of an on-axis field of view is favorably reduced, and the system has good imaging performance on the axis. The surface type of the second lens, the surface type of the third lens and the surface type of the fifth lens are reasonably controlled, so that high-order aberration generated by the lenses can be balanced, and the system has smaller aberration. The focal power of the second lens and the surface type of the third lens are reasonably controlled, so that the aberration of an on-axis field of view is favorably reduced, and the system has good imaging performance on the axis. The focal power and the surface type of the fifth lens and the focal power and the surface type of the sixth lens are reasonably controlled, so that high-order aberration generated by the lenses is balanced, and the system has smaller aberration.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression TTL/ImgH < 1.4, where TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging lens, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens. More specifically, TTL and ImgH can further satisfy 1.26 ≦ TTL/ImgH ≦ 1.28. By restricting the ratio of the total length and the image height of the system, the ultra-thin characteristic of the system can be realized.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression f/EPD < 1.90, where f is a total effective focal length of the optical imaging lens and EPD is an entrance pupil diameter of the optical imaging lens. More specifically, f and EPD further satisfy 1.88 ≦ f/EPD ≦ 1.90. Through restricting the focal length of the system and the diameter of the entrance pupil of the system, the F number of the imaging system with a large image surface is not more than 1.90, the system can be ensured to have a large-aperture imaging effect, and the system also has good imaging quality in a dark environment.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy a conditional expression TTL × Fno/ImgH < 2.5, where TTL is an axial distance from an object side surface of the first lens element to an imaging surface of the optical imaging lens, Fno is an aperture value of the optical imaging lens, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens. More specifically, TTL, Fno, and ImgH may further satisfy 2.37 ≦ TTL × Fno/ImgH ≦ 2.41. The optical system has the characteristics of ultra-thin and large aperture by restricting the ratio of the product of the total length and the relative aperture of the system to the image height.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression 0.11 ≦ BFL/TTL, where BFL is a distance on an optical axis from an image-side surface of the sixth lens element to an imaging surface of the optical imaging lens, and TTL is a distance on an optical axis from an object-side surface of the first lens element to the imaging surface of the optical imaging lens. More specifically, BFL and TTL can further satisfy 0.11 ≦ BFL/TTL ≦ 0.14. The ratio of the on-axis distance from the image side surface of the sixth lens to the imaging surface of the optical imaging lens to the total length of the system is controlled, so that the assembling characteristic of the system structure is facilitated.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression 0.8 ≦ f6|/| f1| < 1.2, where f1 is an effective focal length of the first lens and f6 is an effective focal length of the sixth lens. More specifically, f1 and f6 can further satisfy 0.80 ≦ f6|/| f1| ≦ 1.13. Through reasonably controlling the ratio of the effective focal lengths of the first lens and the sixth lens, the focal power of the system can be reasonably distributed, so that the positive spherical aberration and the negative spherical aberration of the front group lens and the rear group lens are mutually offset.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression-2.5 < f2/f ≦ -1.6, where f2 is an effective focal length of the second lens and f is a total effective focal length of the optical imaging lens. More specifically, f2 and f further satisfy-2.41. ltoreq. f 2/f. ltoreq.1.60. By reasonably adjusting the ratio of the focal power of the second lens to the focal power of the system within a certain range, the off-axis aberration of the optical system can be balanced.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression-3.5 ≦ f234/f ≦ -1.8, where f234 is a combined focal length of the second lens, the third lens, and the fourth lens, and f is a total effective focal length of the optical imaging lens. More specifically, f234 and f further satisfy-3.50. ltoreq. f 234/f. ltoreq-1.80. By restricting the effective focal length of the optical imaging lens and the combined focal length of the second lens, the third lens and the fourth lens within a certain range, the focal power of the system can be reasonably distributed, so that the system has good imaging quality and the sensitivity of the system is effectively reduced.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression-1.7 < f56/f < -1, where f56 is a combined focal length of the fifth lens and the sixth lens, and f is a total effective focal length of the optical imaging lens. More specifically, f56 and f can further satisfy-1.64. ltoreq. f 56/f. ltoreq.1.06. The off-axis aberration of the optical system is favorably balanced by reasonably adjusting the ratio of the combined focal length of the fifth lens and the sixth lens to the focal power of the system within a certain range.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression-2 < (R1+ R2)/(R1-R2) < -1.6, where R1 is a radius of curvature of an object-side surface of the first lens and R2 is a radius of curvature of an image-side surface of the first lens. More specifically, R1 and R2 may further satisfy the formula-1.98 ≦ (R1+ R2)/(R1-R2) ≦ -1.66. By restricting the ratio of the sum of the curvature radii of the object side surface and the image side surface of the first lens to the difference between the sum and the difference within a certain range, the field curvature of each field of view can be balanced within a reasonable range, so that the imaging system has good imaging quality.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression 1.35 ≦ CT1/(T12+ CT2+ T23) < 1.6, where CT1 is a central thickness of the first lens on the optical axis, T12 is a separation distance of the first lens and the second lens on the optical axis, CT2 is a central thickness of the second lens on the optical axis, and T23 is a separation distance of the second lens and the third lens on the optical axis. More specifically, CT1, T12, CT2 and T23 further satisfy 1.35. ltoreq. CT1/(T12+ CT2+ T23). ltoreq.1.58. By restricting the ratio of the center thickness of the first lens to the sum of the air space of the first lens and the second lens on the optical axis, the center thickness of the second lens, and the air gap of the second lens and the third lens on the optical axis within a certain range, it can be ensured that the optical element has good processability.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression 1.1 < ∑ CT ≦ 1.5, where Σ CT is a sum of central thicknesses of the first lens to the sixth lens on the optical axis, respectively, and Σ T is a sum of separation distances of any adjacent two lenses of the first lens to the sixth lens on the optical axis. More specifically, Σ CT and Σ T can further satisfy 1.12 ≦ Σ CT/Σ T ≦ 1.50. The ratio of the sum of the central thicknesses of the first lens to the sixth lens on the axis to the sum of the distances between any two adjacent lenses of the first lens to the sixth lens on the axis is controlled, so that the total length TTL of the system can be ensured to be in a certain range.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression 0.3 < (T45+ CT5+ T56)/TTL ≦ 0.4, where T45 is a separation distance between the fourth lens and the fifth lens on the optical axis, CT5 is a center thickness of the fifth lens on the optical axis, T56 is a separation distance between the fifth lens and the sixth lens on the optical axis, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging lens on the optical axis. More specifically, T45, CT5, T56 and TTL further satisfy 0.33 ≦ (T45+ CT5+ T56)/TTL ≦ 0.40. The system can have ultra-thin characteristics by controlling the ratio of the sum of the air space of the fourth fifth lens, the center thickness of the fifth lens and the air space of the fifth sixth lens to the total length of the system.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression-5.3 < SAG11/CT6 ≦ -2.4, where SAG11 is an on-axis distance from an intersection 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 CT6 is a center thickness of the sixth lens on the optical axis. More specifically, SAG11 and CT6 further satisfy-5.27. ltoreq. SAG11/CT 6. ltoreq. 2.40. By controlling SAG11 and CT6 to meet the requirements, the incident angle of the chief ray on the object side surface of the sixth lens can be effectively reduced, and the matching degree of the lens and the chip can be improved.

In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the conditional expression 3 < SD12/SD4 < 3.6, where SD12 is the maximum effective diameter of the image-side surface of the sixth lens and SD4 is the maximum effective diameter of the image-side surface of the second lens. More specifically, SD12 and SD4 may further satisfy 3.04 ≦ SD12/SD4 ≦ 3.58. The ratio of the maximum effective diameters of the image side surface of the sixth lens and the image side surface of the second lens is controlled, so that the performance of the edge field of view of the system is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy the conditional expression 2 ≦ SD1/SAG1 < 2.2, where SD1 is the maximum effective diameter of the object-side surface of the first lens, and SAG1 is the on-axis distance from the intersection of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens. More specifically, SD1 and SAG1 further can satisfy 2.00 ≦ SD1/SAG1 ≦ 2.19. By controlling SD1 and SAG1 to satisfy the above requirements, it can be ensured that the optical lens has good processing characteristics.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy a conditional expression TTL/f < 1.2, where TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and f is a total effective focal length of the optical imaging lens. More specifically, TTL and f can further satisfy 1.05 ≦ TTL/f ≦ 1.11. By controlling TTL and f, the system miniaturization is facilitated.

In an exemplary embodiment, the optical imaging lens may further include a stop to improve the imaging quality of the lens group. The stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the lens can be effectively reduced, 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 products. The optical lens group with the configuration also has the advantages of being ultrathin, large in image surface, large in aperture, high in imaging quality and the like.

In the embodiment of the present application, at least one of the mirror surfaces of the respective lenses is an aspherical mirror surface, that is, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth 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. Optionally, each of the first, second, third, fourth, fifth, and sixth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical imaging lens is not limited to including six lenses. The optical imaging lens may also include other numbers of lenses, if desired.

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

Example 1

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

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

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

Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 1, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 1

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein 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 the conic coefficient (given in table 1); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S12 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.196E-03

-3.261E-02

1.467E-01

-3.843E-01

6.074E-01

-5.925E-01

3.473E-01

-1.123E-01

1.513E-02

S2

-4.728E-02

4.898E-02

-1.272E-01

3.862E-01

-8.106E-01

1.026E+00

-7.730E-01

3.205E-01

-5.621E-02

S3

-5.011E-02

1.611E-01

-1.095E-01

1.329E-01

-5.042E-01

1.016E+00

-1.034E+00

5.359E-01

-1.122E-01

S4

-5.246E-02

3.161E-01

-7.501E-01

2.096E+00

-4.034E+00

4.513E+00

-2.359E+00

7.722E-02

3.060E-01

S5

-1.245E-01

-1.635E-01

1.653E+00

-7.295E+00

1.889E+01

-3.041E+01

2.982E+01

-1.633E+01

3.840E+00

S6

-9.724E-02

-3.858E-02

3.059E-01

-1.109E+00

2.203E+00

-2.754E+00

2.132E+00

-9.385E-01

1.823E-01

S7

-1.156E-01

-8.524E-02

6.175E-01

-1.745E+00

2.861E+00

-2.877E+00

1.705E+00

-5.108E-01

3.047E-02

S8

-1.325E-01

4.776E-02

7.220E-02

-1.997E-01

2.562E-01

-1.758E-01

6.482E-02

-1.185E-02

7.198E-04

S9

-7.758E-02

-7.087E-03

-2.787E-03

4.271E-03

1.944E-04

-8.723E-04

3.077E-04

-4.940E-05

3.494E-06

S10

-1.294E-02

-3.205E-02

1.993E-02

-1.042E-02

4.004E-03

-9.692E-04

1.295E-04

-5.654E-06

-7.064E-07

S11

-7.858E-02

8.612E-02

-5.365E-02

1.886E-02

-3.874E-03

4.814E-04

-3.590E-05

1.481E-06

-1.928E-08

S12

-1.417E-01

1.060E-01

-6.590E-02

2.710E-02

-7.195E-03

1.234E-03

-1.330E-04

8.026E-06

-1.314E-07

TABLE 2

Table 3 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 1.

f1(mm)	3.51	f6(mm)	-3.74
				f2(mm)	-8.18	f(mm)	4.72
f3(mm)	32.03	TTL(mm)	5.00
				f4(mm)	106.65	ImgH(mm)	3.93
f5(mm)	20.15

TABLE 3

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, an optical imaging lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 4

In embodiment 2, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric. Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Table 6 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 2.

f1(mm)	3.53	f6(mm)	-3.68
				f2(mm)	-8.02	f(mm)	4.72
f3(mm)	32.35	TTL(mm)	5.00
				f4(mm)	101.71	ImgH(mm)	3.93
f5(mm)	17.71

TABLE 6

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural diagram of an optical imaging lens according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 3, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 7

In embodiment 3, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric. Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.658E-03

-2.965E-02

1.390E-01

-3.750E-01

6.068E-01

-6.042E-01

3.607E-01

-1.086E-01

1.624E-02

S2

-4.099E-02

4.794E-02

-1.565E-01

4.713E-01

-9.610E-01

1.196E+00

-8.931E-01

3.687E-01

-6.459E-02

S3

-4.056E-02

1.734E-01

-2.196E-01

4.304E-01

-1.011E+00

1.585E+00

-1.439E+00

7.007E-01

-1.414E-01

S4

-5.252E-02

3.357E-01

-7.469E-01

1.793E+00

-2.870E+00

2.237E+00

1.825E-01

-1.462E+00

6.995E-01

S5

-1.460E-01

-8.720E-02

1.286E+00

-5.962E+00

1.566E+01

-2.544E+01

2.517E+01

-1.394E+01

3.326E+00

S6

-9.704E-02

-3.900E-02

2.907E-01

-1.046E+00

2.084E+00

-2.649E+00

2.112E+00

-9.689E-01

1.977E-01

S7

-1.076E-01

-1.080E-01

7.449E-01

-2.170E+00

3.715E+00

-3.900E+00

2.407E+00

-7.500E-01

4.694E-02

S8

-1.292E-01

4.798E-02

7.594E-02

-2.168E-01

2.925E-01

-2.112E-01

8.179E-02

-1.567E-02

9.934E-04

S9

-8.288E-02

4.412E-04

-1.216E-02

9.847E-03

-6.078E-04

-1.362E-03

5.438E-04

-8.989E-05

6.175E-06

S10

-1.854E-02

-2.926E-02

1.954E-02

-1.133E-02

4.716E-03

-1.173E-03

1.530E-04

-5.948E-06

-8.326E-07

S11

-8.081E-02

8.062E-02

-4.706E-02

1.586E-02

-3.141E-03

3.769E-04

-2.725E-05

1.098E-06

-1.147E-08

S12

-1.434E-01

1.068E-01

-6.739E-02

2.853E-02

-7.772E-03

1.352E-03

-1.461E-04

8.766E-06

-1.477E-07

TABLE 8

Table 9 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 3.

f1(mm)	3.50	f6(mm)	-3.80
				f2(mm)	-7.91	f(mm)	4.72
f3(mm)	25.43	TTL(mm)	5.00
				f4(mm)	149.18	ImgH(mm)	3.93
f5(mm)	21.75

TABLE 9

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values in the case of different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, an optical imaging lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 4, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 10

In embodiment 4, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric.

Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.

TABLE 11

Table 12 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 4.

f1(mm)	3.53	f6(mm)	-3.69
				f2(mm)	-7.55	f(mm)	4.72
f3(mm)	21.86	TTL(mm)	5.00
				f4(mm)	181.72	ImgH(mm)	3.93
f5(mm)	18.38

TABLE 12

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 5, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 13

In embodiment 5, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric. Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.173E-03

-1.823E-02

9.987E-02

-2.978E-01

5.218E-01

-5.526E-01

3.456E-01

-1.174E-01

1.640E-02

S2

-2.553E-02

-1.099E-03

-9.144E-03

3.833E-01

-1.655E-01

3.090E-01

-2.944E-01

1.423E-01

-2.775E-02

S3

-1.384E-02

7.876E-02

-1.192E-01

2.889E-01

-6.523E-01

9.698E-01

-8.485E-01

4.027E-01

-7.966E-02

S4

-1.991E-02

2.975E-01

-1.182E+00

4.322E+00

-1.033E+01

1.555E+01

-1.409E+01

6.985E+00

-1.429E+00

S5

-1.110E-01

-6.259E-02

8.572E-01

-3.942E+00

1.013E+01

-1.598E+01

1.529E+01

-8.172E+00

1.881E+00

S6

-7.739E-02

-5.806E-03

1.239E-01

-5.001E-01

9.868E-01

-1.221E+00

9.439E-01

-4.233E-01

8.597E-02

S7

-9.351E-02

-1.335E-01

8.008E-01

-2.163E+00

3.532E+00

-3.592E+00

2.210E+00

-7.397E-01

8.884E-02

S8

-1.202E-01

-1.765E-02

2.348E-01

-4.691E-01

5.329E-01

-3.413E-01

1.189E-01

-2.016E-02

1.066E-03

S9

-4.830E-02

-5.534E-02

6.384E-02

-6.102E-02

3.693E-02

-1.267E-02

2.458E-03

-2.555E-04

1.142E-05

S10

4.465E-03

-5.071E-02

3.099E-02

-1.568E-02

6.051E-03

-1.497E-03

2.162E-04

-1.521E-05

9.986E-08

S11

-1.439E-01

1.118E-01

-5.512E-02

1.790E-02

-3.703E-03

4.844E-04

-3.883E-05

1.739E-06

-3.271E-08

S12

-2.004E-01

1.373E-01

-7.578E-02

2.804E-02

-6.759E-03

1.059E-03

-1.057E-04

6.250E-06

-1.682E-07

TABLE 14

Table 15 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 5.

Watch 15

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10C shows distortion curves of the optical imaging lens of embodiment 5, which represent distortion magnitude values corresponding to different fields of view. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application.

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

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

Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 6, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 16

In embodiment 6, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric. Table 17 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-2.579E-04

-1.360E-02

8.933E-02

-2.725E-01

4.680E-01

-4.782E-01

2.868E-01

-9.307E-02

1.233E-02

S2

-3.575E-02

9.209E-03

-8.816E-03

1.168E-01

-3.755E-01

5.688E-01

-4.755E-01

2.105E-01

-3.853E-02

S3

-4.114E-02

7.889E-02

3.900E-02

-3.525E-02

-3.433E-01

8.500E-01

-8.838E-01

4.528E-01

-9.298E-02

S4

-2.765E-02

2.734E-01

-9.165E-01

3.132E+00

-6.587E+00

8.055E+00

-5.165E+00

1.224E+00

1.355E-01

S5

-1.004E-01

-2.037E-01

1.775E+00

-7.677E+00

1.977E+01

-3.167E+01

3.088E+01

-1.681E+01

3.927E+00

S6

-9.661E-02

3.589E-02

-6.898E-02

7.798E-02

-9.683E-02

2.716E-02

8.396E-02

-9.758E-02

3.358E-02

S7

-8.522E-02

-2.118E-01

1.040E+00

-2.655E+00

4.141E+00

-4.030E+00

2.340E+00

-6.993E-01

4.621E-02

S8

-1.028E-01

-6.461E-02

3.384E-01

-6.186E-01

6.809E-01

-4.433E-01

1.637E-01

-3.058E-02

1.778E-03

S9

-5.376E-02

-5.968E-02

6.335E-02

-5.129E-02

2.863E-02

-9.513E-03

1.827E-03

-1.901E-04

8.517E-06

S10

1.321E-02

-6.177E-02

3.988E-02

-1.777E-02

5.321E-03

-9.938E-04

9.890E-05

-1.600E-06

-7.206E-07

S11

-4.410E-02

3.827E-02

-1.615E-02

4.135E-03

-6.321E-04

5.356E-05

-1.040E-06

-3.504E-07

5.426E-08

S12

-1.179E-01

6.608E-02

-3.242E-02

1.107E-02

-2.472E-03

3.574E-04

-3.286E-05

1.815E-06

-5.106E-08

TABLE 17

Table 18 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 6.

f1(mm)	3.54	f6(mm)	-3.88
				f2(mm)	-9.54	f(mm)	4.72
f3(mm)	-4575.97	TTL(mm)	5.00
				f4(mm)	41.10	ImgH(mm)	3.93
f5(mm)	19.14

Watch 18

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens according to embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

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

Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 7, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 19

In embodiment 7, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric.

Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 20

Table 21 gives effective focal lengths f1 to f6 of the respective lenses, a total effective focal length f of the optical imaging lens, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and a half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 7.

f1(mm)	3.97	f6(mm)	-3.17
				f2(mm)	-10.71	f(mm)	4.56
f3(mm)	22.98	TTL(mm)	5.00
				f4(mm)	-71.20	ImgH(mm)	3.93
f5(mm)	9.15

TABLE 21

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging lens according to embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural diagram of an optical imaging lens according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

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

Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 8, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 22

In embodiment 8, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric.

Table 23 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 8, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

9.193E-04

-2.980E-03

2.698E-02

-8.681E-02

1.585E-01

-1.705E-01

1.054E-01

-3.438E-02

4.273E-03

S2

-2.865E-02

1.358E-02

-6.944E-02

2.363E-01

-5.458E-01

7.761E-01

-6.604E-01

3.074E-01

-6.001E-02

S3

-3.995E-02

2.986E-02

2.002E-01

-7.109E-01

1.343E+00

-1.535E+00

1.040E+00

-3.754E-01

5.430E-02

S4

-3.038E-02

2.045E-01

-7.565E-01

2.876E+00

-6.888E+00

1.022E+01

-9.084E+00

4.413E+00

-8.842E-01

S5

-5.840E-02

-1.346E-01

9.874E-01

-4.057E+00

9.942E+00

-1.520E+01

1.416E+01

-7.394E+00

1.667E+00

S6

-4.865E-02

-2.385E-02

9.573E-02

-3.809E-01

7.883E-01

-1.056E+00

8.815E-01

-4.194E-01

8.792E-02

S7

-9.425E-02

-1.844E-01

6.895E-01

-1.377E+00

1.664E+00

-1.246E+00

5.503E-01

-1.227E-01

3.416E-03

S8

-1.062E-01

-9.145E-02

3.012E-01

-4.348E-01

3.810E-01

-1.963E-01

5.691E-02

-8.232E-03

3.633E-04

S9

-1.101E-02

-6.407E-02

5.841E-02

-5.079E-02

3.094E-02

-1.113E-02

2.263E-03

-2.393E-04

9.963E-06

S10

4.206E-02

-4.545E-02

1.300E-02

-1.941E-03

8.167E-05

6.211E-05

-2.185E-05

3.005E-06

-1.629E-07

S11

-8.527E-02

8.418E-02

-4.334E-02

1.287E-02

-2.303E-03

2.557E-04

-1.739E-05

6.708E-07

-1.111E-08

S12

-1.524E-01

9.899E-02

-4.934E-02

1.609E-02

-3.383E-03

4.545E-04

-3.789E-05

1.813E-06

-3.915E-08

TABLE 23

Table 24 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in embodiment 8.

f1(mm)	3.97	f6(mm)	-3.19
				f2(mm)	-10.97	f(mm)	4.56
f3(mm)	24.15	TTL(mm)	5.00
				f4(mm)	-80.92	ImgH(mm)	3.93
f5(mm)	9.42

Watch 24

Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 8, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the optical imaging lens of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 8, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 16A to 16D, the optical imaging lens according to embodiment 8 can achieve good imaging quality.

Example 9

An optical imaging lens according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 is a schematic structural view showing an optical imaging lens according to embodiment 9 of the present application.

As shown in fig. 17, an optical imaging lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

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

Table 25 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 9, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 25

In embodiment 9, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric. Table 26 shows high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 26

Table 27 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in example 9.

f1(mm)	3.97	f6(mm)	-3.32
				f2(mm)	-10.52	f(mm)	4.56
f3(mm)	22.26	TTL(mm)	5.04
				f4(mm)	-62.27	ImgH(mm)	3.93
f5(mm)	9.38

Watch 27

Fig. 18A shows an on-axis chromatic aberration curve of an optical imaging lens of embodiment 9, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 9. Fig. 18C shows a distortion curve of the optical imaging lens of embodiment 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 9, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 18A to 18D, the optical imaging lens according to embodiment 9 can achieve good imaging quality.

Example 10

An optical imaging lens according to embodiment 10 of the present application is described below with reference to fig. 19 to 20D. Fig. 19 shows a schematic structural diagram of an optical imaging lens according to embodiment 10 of the present application.

As shown in fig. 19, the optical imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

Table 28 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 10, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 28

In embodiment 10, both the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric.

Table 29 shows high-order term coefficients that can be used for each aspherical mirror surface in example 10, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.259E-03

-9.794E-03

6.800E-02

-2.266E-01

4.168E-01

-4.534E-01

2.884E-01

-9.951E-02

1.412E-02

S2

-3.757E-02

1.836E-02

-1.093E-02

4.209E-02

-1.627E-01

2.767E-01

-2.573E-01

1.270E-01

-2.580E-02

S3

-3.844E-02

1.010E-01

6.980E-02

-3.708E-01

5.537E-01

-4.207E-01

1.406E-01

1.295E-02

-1.505E-02

S4

-3.920E-02

3.231E-01

-9.927E-01

3.013E+00

-5.747E+00

6.183E+00

-3.019E+00

-3.427E-02

4.302E-01

S5

-1.093E-01

-2.361E-01

2.195E+00

-9.785E+00

2.559E+01

-4.129E+01

4.032E+01

-2.189E+01

5.087E+00

S6

-9.569E-02

1.326E-02

4.738E-02

-3.121E-01

6.449E-01

-8.487E-01

7.258E-01

-3.654E-01

8.284E-02

S7

-1.048E-01

-1.819E-01

1.064E+00

-2.889E+00

4.658E+00

-4.622E+00

2.702E+00

-8.028E-01

5.396E-02

S8

-1.332E-01

3.569E-02

1.052E-01

-2.346E-01

2.744E-01

-1.807E-01

6.554E-02

-1.192E-02

7.245E-04

S9

-7.116E-02

-2.041E-02

1.204E-02

-6.130E-03

4.940E-03

-2.241E-03

5.440E-04

-7.134E-05

4.333E-06

S10

-1.648E-03

-4.278E-02

2.599E-02

-1.189E-02

3.875E-03

-8.034E-04

9.123E-05

-2.622E-06

-5.673E-07

S11

-8.417E-02

9.471E-02

-5.948E-02

2.109E-02

-4.388E-03

5.527E-04

-4.150E-05

1.673E-06

-1.555E-08

S12

-1.525E-01

1.159E-01

-7.160E-02

2.898E-02

-7.563E-03

1.273E-03

-1.335E-04

7.504E-06

-3.582E-08

Watch 29

Table 30 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in example 10.

Watch 30

Fig. 20A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 10, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 20B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 10. Fig. 20C shows a distortion curve of the optical imaging lens of embodiment 10, which represents distortion magnitude values corresponding to different image heights. Fig. 20D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 10, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 20A to 20D, the optical imaging lens according to embodiment 10 can achieve good imaging quality.

Example 11

An optical imaging lens according to embodiment 11 of the present application is described below with reference to fig. 21 to 22D. Fig. 21 is a schematic structural view showing an optical imaging lens according to embodiment 11 of the present application.

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

Table 31 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 11, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 31

In example 11, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric. Table 32 shows high-order term coefficients that can be used for each aspherical mirror surface in example 11, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.775E-04

-1.672E-02

8.987E-02

-2.617E-01

4.449E-01

-4.607E-01

2.844E-01

-9.652E-02

1.359E-02

S2

-3.428E-02

9.022E-03

-3.129E-02

1.650E-01

-4.586E-01

6.821E-01

-5.794E-01

2.649E-01

-5.044E-02

S3

-3.063E-02

9.393E-02

-6.970E-02

2.491E-01

-8.081E-01

1.363E+00

-1.260E+00

6.204E-01

-1.268E-01

S4

-1.823E-02

2.381E-01

-7.420E-01

2.476E+00

-5.181E+00

6.349E+00

-4.104E+00

9.969E-01

9.990E-02

S5

-8.883E-02

-2.108E-01

1.814E+00

-8.019E+00

2.079E+01

-3.323E+01

3.217E+01

-1.734E+01

4.015E+00

S6

-1.052E-01

1.486E-01

-4.771E-01

9.330E-01

-1.264E+00

1.033E+00

-4.276E-01

3.564E-02

2.188E-02

S7

-2.166E-01

1.432E-01

5.499E-01

-2.421E+00

4.418E+00

-4.504E+00

2.571E+00

-7.001E-01

2.010E-02

S8

-2.965E-01

4.500E-01

-5.864E-01

5.498E-01

-3.277E-01

1.221E-01

-2.811E-02

3.683E-03

-1.831E-04

S9

-1.823E-01

1.677E-01

-1.753E-01

1.089E-01

-4.043E-02

9.265E-03

-1.249E-03

8.070E-05

-4.004E-07

S10

-1.054E-01

1.091E-01

-8.997E-02

4.263E-02

-1.302E-02

2.644E-03

-3.429E-04

2.540E-05

-8.031E-07

S11

-4.256E-01

4.671E-01

-2.734E-01

9.358E-02

-1.967E-02

2.576E-03

-2.042E-04

9.051E-06

-2.325E-07

S12

-3.963E-01

3.438E-01

-1.869E-01

6.449E-02

-1.455E-02

2.158E-03

-2.053E-04

1.144E-05

-2.466E-07

Watch 32

Table 33 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 in example 11.

f1(mm)	3.55	f6(mm)	-4.02
				f2(mm)	-9.39	f(mm)	4.70
f3(mm)	35.11	TTL(mm)	5.02
				f4(mm)	-26.69	ImgH(mm)	3.93
f5(mm)	11.54

Watch 33

Fig. 22A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 11, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 22B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of example 11. Fig. 22C shows a distortion curve of the optical imaging lens of embodiment 11, which represents distortion magnitude values corresponding to different image heights. Fig. 22D shows a chromatic aberration of magnification curve of the optical imaging lens of example 11, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 22A to 22D, the optical imaging lens according to embodiment 11 can achieve good imaging quality.

In summary, examples 1 to 11 satisfy the relationship shown in table 34, respectively.

Watch 34

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.

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

Claims

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

a first lens having a positive optical power;

a second lens having a negative optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;

a sixth lens having a negative optical power;

the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens meet | f6|/| f1| < 1.2 more than or equal to 0.8,

the distance BFL between the image side surface of the sixth lens element and the imaging surface of the optical imaging lens on the optical axis and the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis satisfy the condition that BFL/TTL is not less than 0.11,

the combined focal length f234 of the second lens, the third lens and the fourth lens and the total effective focal length f of the optical imaging lens satisfy-3.5 ≤ f234/f ≤ 1.8, and

the number of lenses having power in the optical imaging lens is six.

2. The optical imaging lens of claim 1, characterized in that the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy-2.5 < f2/f ≦ -1.6.

3. The optical imaging lens of claim 1, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis, an aperture value Fno of the optical imaging lens, and a half of an ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy TTL/Fno/ImgH < 2.5.

4. The optical imaging lens of claim 1, wherein the combined focal length f56 of the fifth lens and the sixth lens and the total effective focal length f of the optical imaging lens satisfy-1.7 < f56/f < -1.

5. The optical imaging lens of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy-2 < (R1+ R2)/(R1-R2) < -1.6.

6. The optical imaging lens according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a separation distance T12 of the first lens and the second lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a separation distance T23 of the second lens and the third lens on the optical axis satisfy 1.35 ≦ CT1/(T12+ CT2+ T23) < 1.6.

7. The optical imaging lens according to claim 1, wherein a sum Σ CT of central thicknesses of the first lens to the sixth lens on the optical axis respectively and a sum Σ T of separation distances on the optical axis of any adjacent two lenses of the first lens to the sixth lens satisfy 1.1 ∑ CT/∑ T ≦ 1.5.

8. The optical imaging lens of claim 7, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy TTL/ImgH < 1.4.

9. The optical imaging lens of claim 1, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis, a center thickness CT5 between the fifth lens and the fifth lens on the optical axis, a separation distance T56 between the fifth lens and the sixth lens on the optical axis, and a distance TTL between an object side surface of the first lens and an imaging surface of the optical imaging lens on the optical axis satisfy 0.3 < (T45+ CT5+ T56)/TTL ≦ 0.4.

10. The optical imaging lens of claim 1, wherein an on-axis distance from an intersection point of an object-side surface of the sixth lens and the optical axis to an effective radius apex of the object-side surface of the sixth lens, SAG11, and a center thickness CT6 of the sixth lens on the optical axis satisfy-5.3 < SAG11/CT6 ≦ -2.4.

11. The optical imaging lens of claim 1, wherein the maximum effective diameter SD12 of the image side surface of the sixth lens and the maximum effective diameter SD4 of the image side surface of the second lens satisfy 3 < SD12/SD4 < 3.6.

12. The optical imaging lens according to claim 1, characterized in that an on-axis distance SAG1 from an intersection point of a maximum effective diameter SD1 of the object-side surface of the first lens with 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 2 ≦ SD1/SAG1 < 2.2.