CN113433664B

CN113433664B - Camera lens

Info

Publication number: CN113433664B
Application number: CN202110793604.6A
Authority: CN
Inventors: 戴付建; 宋立通; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-10-11
Anticipated expiration: 2041-07-12
Also published as: CN113433664A; CN115616736A

Abstract

The application discloses a camera lens, it includes along optical axis from the thing side to image side in order: a first lens having an optical power; a second lens having a refractive power, an object side surface of which is concave; a third lens having positive optical power; a fourth lens having an optical power; and a fifth lens having a power. The distance TTL on the optical axis from the object-side surface of the first lens to the imaging surface of the imaging lens, the maximum half field angle Semi-FOV of the imaging lens, the F-number Fno of the imaging lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy the following conditional expressions: 4.5mm < TTL XFno/tan (Semi-FOV) < 8.0mm; and TTL/(CT 1+ CT 5) is more than 3.0 and less than or equal to 3.5.

Description

Camera lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging lens.

Background

With the rapid development of the electronic consumption field, the development trend of product intellectualization is more and more obvious. As is well known, the intelligent electronic product often has application functions such as scene shooting and detection and recognition, and these functions are mainly realized by shooting with a camera lens mounted on the intelligent electronic product. Based on the characteristics of the intelligent electronic product such as miniaturization requirement, in order to better meet the application requirement of the small intelligent electronic product, the market also puts forward a stricter requirement on the camera lens loaded on the intelligent electronic product.

Disclosure of Invention

The present application provides an imaging lens, which includes, in order from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a refractive power, an object-side surface of which is concave; a third lens having a positive optical power; a fourth lens having an optical power; and a fifth lens having a power. The distance TTL on the optical axis from the object-side surface of the first lens to the imaging surface of the imaging lens, the maximum half field angle Semi-FOV of the imaging lens, the F-number Fno of the imaging lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis may satisfy the following conditional expressions: 4.5mm < TTL XFno/tan (Semi-FOV) < 8.0mm; and TTL/(CT 1+ CT 5) is more than 3.0 and less than or equal to 3.5.

In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the fifth lens is an aspherical mirror surface.

In one embodiment, the imaging lens further includes a stop located between the first lens and the second lens, and a distance T1s between an image side surface of the first lens and an optical axis of the stop, a distance T12 between the image side surface of the first lens and an object side surface of the second lens, and a distance SAG21 between an intersection point of the object side surface of the second lens and the optical axis and a maximum effective radius vertex of the object side surface of the second lens on the optical axis may satisfy: -2.0 < (T12-T1 s)/SAG 21 is less than or equal to-1.5.

In one embodiment, the imaging lens further includes a stop, and the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DTs of the stop, and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy: the ratio of (DT 11-DTs)/(DT 52-DTs) is more than or equal to 0.9 and less than or equal to 1.2.

In one embodiment, an average value DT3 of the maximum effective radii of the object-side surface and the image-side surface of the third lens, an average value DT4 of the maximum effective radii of the object-side surface and the image-side surface of the fourth lens, and a maximum effective radius DT12 of the image-side surface of the first lens may satisfy: 0.9 < (DT 3+ DT 4)/(2 XDT 12) ≦ 1.3.

In one embodiment, a half of a diagonal length ImgH of an effective pixel region on an imaging plane of an imaging lens and a maximum effective radius DT11 of an object side surface of a first lens may satisfy: imgH/DT11 is more than or equal to 1.0 and less than 1.5.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: -3.5 < f1/f3 < -1.5.

In one embodiment, the total effective focal length f of the image pickup lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy: 3.5 < (f 2+ f 3)/f < 6.0.

In one embodiment, the total effective focal length f of the image pickup lens and the central thickness CT5 of the fifth lens on the optical axis may satisfy: f/CT5 is more than or equal to 1.5 and less than 3.0.

In one embodiment, the effective focal length f2 of the second lens and the radius of curvature R3 of the object-side surface of the second lens may satisfy: f2/R3 is more than-2.0 and less than or equal to-0.9.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 2.0 is less than or equal to (| R3| -R4)/(| R3| + R4) < 3.5.

In one embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object-side surface of the first lens may satisfy: f1/R1 is more than 1.5 and less than 3.5.

In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the central thickness CT3 of the third lens on the optical axis may satisfy: R5/CT3 is more than 2.0 and less than 5.0.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the central thickness CT3 of the third lens on the optical axis may satisfy: -5.0 < (f 1+ f 3)/CT 3 < -2.0.

In one embodiment, a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the imaging lens, a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens, and an entrance pupil diameter EPD of the imaging lens may satisfy: TTL/(ImgH/EPD) < 2.0mm is more than or equal to 1.4 mm.

Another aspect of the present application provides an imaging lens. The image pickup lens sequentially comprises from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a refractive power, an object side surface of which is concave; a third lens having positive optical power; a fourth lens having an optical power; and a fifth lens having optical power. The distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the image pickup lens, the maximum half field angle Semi-FOV of the image pickup lens and the F number Fno of the image pickup lens can meet the following requirements: 4.5mm < TTL XFno/tan (Semi-FOV) < 8.0mm; and the effective focal length f1 of the first lens and the effective focal length f3 of the third lens can satisfy: -3.5 < f1/f3 < -1.5.

In one embodiment, the imaging lens further includes a stop located between the first lens and the second lens, and a distance T1s between an image side surface of the first lens and an optical axis of the stop, a distance T12 between the image side surface of the first lens and an object side surface of the second lens, and a distance SAG21 between an intersection point of the object side surface of the second lens and the optical axis and a maximum effective radius vertex of the object side surface of the second lens on the optical axis may satisfy: -2.0 < (T12-T1 s)/SAG 21 ≦ 1.5.

In one embodiment, the imaging lens further includes a stop, and the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DTs of the stop, and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: the ratio of (DT 11-DTs)/(DT 52-DTs) is more than or equal to 0.9 and less than or equal to 1.2.

In one embodiment, an average value DT3 of the maximum effective radii of the object-side surface and the image-side surface of the third lens, an average value DT4 of the maximum effective radii of the object-side surface and the image-side surface of the fourth lens, and a maximum effective radius DT12 of the image-side surface of the first lens may satisfy: 0.9 < (DT 3+ DT 4)/(2 XDT 12) is less than or equal to 1.3.

In one embodiment, a half ImgH of a diagonal length of an effective pixel region on an imaging plane of an imaging lens and a maximum effective radius DT11 of an object side surface of a first lens may satisfy: imgH/DT11 is more than or equal to 1.0 and less than 1.5.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 2.0 ≦ (| R3| -R4)/(| R3| + R4) < 3.5.

In one embodiment, a distance TTL on the optical axis from the object side surface of the first lens element to the image plane of the imaging lens, a central thickness CT1 of the first lens element on the optical axis, and a central thickness CT5 of the fifth lens element on the optical axis may satisfy: TTL/(CT 1+ CT 5) is more than 3.0 and less than or equal to 3.5.

The present application adopts a plurality of (for example, five) lenses, and reasonably distributes the focal power, the surface type, the center thickness of each lens, the on-axis distance between each lens, and the like, so that the above-mentioned camera lens has at least one beneficial effect of miniaturization, wide angle, high imaging quality, and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;

fig. 2A to 2C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 1, respectively;

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

fig. 4A to 4C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 2, respectively;

fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;

fig. 6A to 6C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 3, respectively;

fig. 7 is a schematic configuration diagram showing an imaging lens according to embodiment 4 of the present application;

fig. 8A to 8C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of embodiment 4, respectively;

fig. 9 is a schematic configuration diagram showing an imaging lens according to embodiment 5 of the present application; and

fig. 10A to 10C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of example 5, respectively.

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 examples or illustrations.

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.

An image pickup lens according to an exemplary embodiment of the present application may include five lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, respectively. The five lenses are arranged in order from an object side to an image side along an optical axis. Any adjacent two lenses of the first lens to the fifth lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a positive power or a negative power; the second lens can have positive focal power or negative focal power, and the object side surface of the second lens can be a concave surface; the third lens may have a positive optical power; the fourth lens may have a positive power or a negative power; and the fifth lens may have a positive power or a negative power. Through the focal power and the surface type characteristics of the first lens to the fifth lens which are reasonably distributed, the camera lens has the characteristics of large field of view, short total length and the like, and is favorable for comprehensively correcting various aberrations, so that the camera lens has better imaging quality.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 4.5mm < TTL XFno/tan (Semi-FOV) < 8.0mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis, semi-FOV is the maximum half field angle of the camera lens, and Fno is the F number of the camera lens. More specifically, TTL, fno and Semi-FOV further satisfy: 4.7mm < TTL XFno/tan (Semi-FOV) < 7.3mm. The requirements that TTL multiplied by Fno/tan (Semi-FOV) is more than 4.5mm and less than 8.0mm are met, and the camera lens has the characteristics of large field of view, short total length and the like.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: TTL/(CT 1+ CT 5) is more than 3.0 and less than or equal to 3.5, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis, CT1 is the central thickness of the first lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. The TTL/(CT 1+ CT 5) is more than 3.0 and less than or equal to 3.5, and the miniaturization is favorably realized.

In an exemplary embodiment, an imaging lens according to the present application further includes a stop disposed between the first lens and the second lens. The camera lens according to the application can satisfy: -2.0 < (T12-T1 s)/SAG 21 ≦ 1.5, wherein T1s is a distance separating the image-side surface of the first lens from the stop on the optical axis, T12 is a distance separating the image-side surface of the first lens from the object-side surface of the second lens on the optical axis, and SAG21 is a distance separating the intersection point of the object-side surface of the second lens and the optical axis from the vertex of the maximum effective radius of the object-side surface of the second lens on the optical axis. More specifically, T12, T1s and SAG21 further may satisfy: -1.9 < (T12-T1 s)/SAG 21 is less than or equal to-1.5. Satisfies the condition that (T12-T1 s)/SAG 21 is less than or equal to-1.5 and can better correct the spherical aberration of the lens.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.9 ≦ (DT 11-DTs)/(DT 52-DTs) ≦ 1.2, where DT11 is the maximum effective radius of the object-side face of the first lens, DTs is the maximum effective radius of the diaphragm, and DT52 is the maximum effective radius of the image-side face of the fifth lens. The requirement that (DT 11-DTs)/(DT 52-DTs) is more than or equal to 0.9 and less than or equal to 1.2 is met, the focal power of each lens can be reasonably distributed, the coma aberration of the lens is comprehensively corrected, and the definition of an imaging picture in a marginal field area is ensured.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.9 < (DT 3+ DT 4)/(2 xDT 12) ≦ 1.3, wherein DT3 is an average of the maximum effective radii of the object-side surface and the image-side surface of the third lens, DT4 is an average of the maximum effective radii of the object-side surface and the image-side surface of the fourth lens, and DT12 is the maximum effective radius of the image-side surface of the first lens. Satisfy 0.9 < (DT 3+ DT 4)/(2 XDT 12) and be less than or equal to 1.3, can rationally match third lens and fourth lens to do benefit to and correct vertical axis colour difference, promote picture imaging quality.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.0-ImgH/DT 11 < 1.5, wherein ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens, and DT11 is the maximum effective radius of the object side surface of the first lens. The requirement that ImgH/DT11 is more than or equal to 1.0 and less than 1.5 is met, the overall arrangement of the lens can be ensured to be reasonable, and the lens is ensured to have better manufacturability.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -3.5 < f1/f3 < -1.5, wherein f1 is the effective focal length of the first lens and f3 is the effective focal length of the third lens. More specifically, f1 and f3 further satisfy: -3.2 < f1/f3 < -1.5. F1/f3 is more than-3.5 and less than-1.5, and the coma aberration of the lens can be better corrected so as to ensure the definition of the picture under a large field of view.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5 < (f 2+ f 3)/f < 6.0, wherein f is the total effective focal length of the camera lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. More specifically, f2, f3 and f may further satisfy: 3.7 < (f 2+ f 3)/f < 5.8. Satisfy 3.5 < (f 2+ f 3)/f < 6.0, be favorable to correcting the field curvature aberration of lens, guarantee that picture center and marginal area can obtain clear image quality.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: f/CT5 is more than or equal to 1.5 and less than 3.0, wherein f is the total effective focal length of the camera lens, and CT5 is the central thickness of the fifth lens on the optical axis. More specifically, f and CT5 further satisfy: f/CT5 is more than or equal to 1.5 and less than 2.7. f/CT5 is more than or equal to 1.5 and less than 3.0, which is favorable for correcting the optical distortion of the lens and ensures that the shot picture has no obvious deformation.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -2.0 < f2/R3 ≦ -0.9, wherein f2 is the effective focal length of the second lens and R3 is the radius of curvature of the object-side surface of the second lens. More specifically, f2 and R3 further satisfy: f2/R3 is more than-1.6 and less than or equal to-0.9. Satisfy-2.0 < f2/R3 ≦ 0.9, can correct the lens spherical aberration well, can reduce the tolerance sensitivity of second lens simultaneously, improve the manufacturability of second lens.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.0 ≦ (| R3| -R4)/(| R3| + R4) < 3.5, where R3 is the radius of curvature of the object-side surface of the second lens and R4 is the radius of curvature of the image-side surface of the second lens. More specifically, R3 and R4 may further satisfy: 2.0 ≦ (| R3| -R4)/(| R3| + R4) < 3.2. Satisfies the condition that (| R3| -R4)/(| R3| + R4) < 3.5) more than or equal to 2.0, and can better correct the field curvature and astigmatic aberration of the off-axis field.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.5 < f1/R1 < 3.5, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object-side surface of the first lens. More specifically, f1 and R1 further satisfy: f1/R1 is more than 1.5 and less than 3.2. F1/R1 is more than 1.5 and less than 3.5, the spherical aberration of the central field of view and the coma aberration of the edge field of view can be comprehensively corrected, and the camera lens is favorable for having larger lens aperture and clear imaging quality.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.0 < R5/CT3 < 5.0, wherein R5 is a radius of curvature of an object side surface of the third lens, and CT3 is a center thickness of the third lens on an optical axis. More specifically, R5 and CT3 further may satisfy: R5/CT3 is more than 2.0 and less than 4.8. The requirement that R5/CT3 is more than 2.0 and less than 5.0 is met, and the axial chromatic aberration of the lens can be corrected.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: -5.0 < (f 1+ f 3)/CT 3 < -2.0, wherein f1 is an effective focal length of the first lens, f3 is an effective focal length of the third lens, and CT3 is a central thickness of the third lens on the optical axis. More specifically, f1, f3 and CT3 further satisfy: -4.4 < (f 1+ f 3)/CT 3 < -2.2. Satisfy (f 1+ f 3)/CT 3 less than-2.0 less than-5.0, be favorable to correcting camera lens spherical aberration, promote whole picture image quality.

In an exemplary embodiment, an imaging lens according to the present application may satisfy: TTL/(ImgH/EPD) < 2.0mm is more than or equal to 1.4mm, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis, imgH is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens, and EPD is the entrance pupil diameter of the camera lens. More specifically, TTL, imgH, and EPD may further satisfy: TTL/(ImgH/EPD) < 1.8mm and is more than or equal to 1.4 mm. The requirements of TTL/(ImgH/EPD) < 2.0mm which is more than or equal to 1.4mm are met, and the camera lens has the characteristics of short length, large image surface, large aperture and the like.

In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the first lens and the second lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.

The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the axial distance between each lens and the like, the volume of the camera lens can be effectively reduced, the machinability of the camera lens is improved, and the camera lens is more favorable for production and processing and can be suitable for portable electronic products. The camera lens has the characteristics of wide angle, small size, good imaging quality and the like, and can well meet the use requirements of various portable electronic products in a camera scene.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspheric mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the fifth lens is an aspheric 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 in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, and fifth 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 imaging lens may be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the imaging lens is not limited to including five lenses. The camera lens may also include other numbers of lenses, if desired.

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

Example 1

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

As shown in fig. 1, the imaging lens includes, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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

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

TABLE 1

In this example, the total effective focal length f of the imaging lens is 1.23mm, and the maximum field angle FOV of the imaging lens is 123.1 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =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 a correction system of the i-th order of the aspheric surfaceAnd (4) counting. Table 2 below shows the coefficients A of the higher-order terms which can be used for the aspherical mirror surfaces S1 to S10 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.0936E+00

-8.9743E-02

4.0139E-02

-8.0981E-03

3.5722E-03

-1.2495E-03

3.2514E-04

-2.0911E-04

0.0000E+00

S2

2.0255E-01

9.6178E-03

6.3217E-03

5.8962E-04

-1.8321E-04

-2.8920E-04

-2.7586E-04

-1.0628E-04

-7.8851E-05

S3

-1.6497E-02

-9.9391E-04

-1.3576E-04

-2.8654E-05

-8.1299E-06

-1.8499E-06

-9.7852E-06

0.0000E+00

S4

-8.5991E-02

2.2114E-03

-2.7213E-03

-5.8865E-05

-2.3057E-04

7.9174E-06

5.3737E-06

0.0000E+00

S5

-7.6377E-02

3.2993E-02

-6.2218E-03

2.1839E-03

-7.6288E-04

4.3665E-04

-1.4495E-04

3.4691E-05

-4.3195E-05

S6

1.0542E-01

5.5978E-02

1.4719E-02

2.9555E-03

1.0241E-03

1.2741E-03

2.3525E-04

7.1892E-04

2.5844E-04

S7

1.1979E+00

-2.1946E-01

4.7143E-02

-1.8273E-02

5.8627E-03

-2.5071E-03

9.6493E-04

1.7506E-04

2.5651E-04

S8

1.0623E+00

-1.6060E-01

2.3952E-02

-8.5505E-03

5.5336E-03

-3.5860E-03

1.4649E-03

-2.6208E-04

0.0000E+00

S9

-7.4868E-01

8.1502E-02

-5.7542E-03

1.5877E-02

-3.3726E-03

-2.5776E-04

-1.8468E-03

8.3479E-04

0.0000E+00

S10

-1.0348E-02

-2.6216E-01

6.4194E-02

-2.4156E-02

1.7988E-02

-3.2404E-03

1.6675E-03

2.5370E-04

0.0000E+00

TABLE 2

Fig. 2A shows on-axis chromatic aberration curves of the imaging lens of embodiment 1, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2A to 2C, the imaging lens system according to embodiment 1 can achieve good imaging quality.

Example 2

An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. 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 configuration diagram of an imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the image capturing lens system includes, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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

In the present example, the total effective focal length f of the imaging lens is 1.78mm, and the maximum field angle FOV of the imaging lens is 120.0 °.

Table 3 shows a basic parameter table of the imaging lens of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm). Table 4 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 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.5080E-01

-6.8482E-02

1.2895E-02

1.3270E-02

-1.2784E-02

5.3213E-03

-1.2117E-03

1.4524E-04

-7.1031E-06

S2

1.4354E-01

2.2948E+00

-1.6635E+01

6.5121E+01

-1.5622E+02

2.3439E+02

-2.1346E+02

1.0751E+02

-2.2907E+01

S3

-2.2431E-01

-1.4501E+00

5.8669E+00

3.8776E+01

-5.4228E+02

1.3641E+03

4.9161E+01

0.0000E+00

S4

-8.5186E-01

3.1835E+00

-2.4342E+00

-5.6786E+01

2.6807E+02

-4.9927E+02

3.3963E+02

0.0000E+00

S5

-2.4014E-01

1.8232E+00

-5.6075E+00

8.4406E+00

-2.8042E+00

-1.0706E+01

1.7451E+01

-1.0854E+01

2.5103E+00

S6

-6.1497E-02

-9.7778E-01

6.0252E+00

-1.7766E+01

3.1271E+01

-3.4430E+01

2.3275E+01

-8.8248E+00

1.4340E+00

S7

4.1394E-01

-2.5276E+00

9.0505E+00

-2.0114E+01

2.8310E+01

-2.5443E+01

1.4194E+01

-4.4803E+00

6.1097E-01

S8

-2.5205E-01

9.5943E-01

-1.6054E+00

1.2962E+00

-1.4443E-01

-5.4874E-01

4.1401E-01

-1.2138E-01

1.2981E-02

S9

3.9912E-02

1.0674E-01

-4.5417E-01

5.7447E-01

-3.9626E-01

1.6805E-01

-4.3960E-02

6.5297E-03

-4.2247E-04

S10

1.3088E-01

-2.2778E-01

2.0415E-01

-1.3740E-01

6.7673E-02

-2.3105E-02

5.0565E-03

-6.2590E-04

3.2845E-05

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the 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 imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4A to 4C, the imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

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

As shown in fig. 5, the imaging lens includes, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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

In this example, the total effective focal length f of the imaging lens is 1.56mm, and the maximum field angle FOV of the imaging lens is 120.0 °.

Table 5 shows a basic parameter table of the imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 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.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.0180E-01

-4.0313E-01

4.4893E-01

-3.5958E-01

2.0078E-01

-7.5389E-02

1.8032E-02

-2.4663E-03

1.4599E-04

S2

6.4607E-01

-2.0106E+00

9.2289E+00

-3.4362E+01

9.0388E+01

-1.5398E+02

1.5995E+02

-9.1137E+01

2.1662E+01

S3

-2.3490E-01

-1.0533E+00

1.7820E+01

-2.2365E+02

1.5208E+03

-5.2650E+03

7.0217E+03

0.0000E+00

S4

-1.1486E+00

6.2358E+00

-3.1456E+01

1.1168E+02

-2.4644E+02

2.9586E+02

-1.5607E+02

0.0000E+00

S5

-3.1754E-01

1.9199E+00

-7.7728E+00

2.4350E+01

-5.2039E+01

7.2849E+01

-6.4365E+01

3.2484E+01

-7.1021E+00

S6

-4.1852E-01

2.2469E+00

-2.0294E+01

7.3529E+01

-1.4605E+02

1.7588E+02

-1.2773E+02

5.1246E+01

-8.6884E+00

S7

5.1096E-01

-1.1155E+00

-1.9608E+00

1.4587E+01

-3.6381E+01

5.0965E+01

-4.1448E+01

1.8119E+01

-3.2804E+00

S8

-5.4863E-01

1.3429E+00

1.4312E+00

-9.8842E+00

1.7452E+01

-1.6290E+01

8.7496E+00

-2.5624E+00

3.1797E-01

S9

-3.9683E-01

8.1934E-01

-1.8966E+00

3.2393E+00

-3.5259E+00

2.3987E+00

-1.0047E+00

2.4085E-01

-2.5695E-02

S10

2.3443E-01

-9.3139E-01

1.3069E+00

-1.1303E+00

6.4069E-01

-2.3781E-01

5.5437E-02

-7.3270E-03

4.1692E-04

TABLE 6

Fig. 6A shows on-axis chromatic aberration curves of the imaging lens of embodiment 3, which represent deviation of convergence focuses 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 imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6A to 6C, the imaging lens system according to embodiment 3 can achieve good imaging quality.

Example 4

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

As shown in fig. 7, the imaging lens includes, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

In this example, the total effective focal length f of the imaging lens is 1.37mm, and the maximum field angle FOV of the imaging lens is 120.0 °.

Table 7 shows a basic parameter table of the imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of the convergent focus 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 imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 8A to 8C, the imaging lens according to embodiment 4 can achieve good imaging quality.

Example 5

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

As shown in fig. 9, the imaging lens includes, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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

In this example, the total effective focal length f of the imaging lens is 1.58mm, and the maximum field angle FOV of the imaging lens is 120.0 °.

Table 9 shows a basic parameter table of the imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 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.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.8569E-02

-4.1365E-03

-4.6392E-05

0.0000E+00

S2

7.4794E-02

-3.1146E-03

-4.5612E-03

0.0000E+00

S3

-1.4219E-01

7.9466E-01

-3.3654E+00

0.0000E+00

S4

1.4230E-01

-1.0517E-01

1.8346E-01

0.0000E+00

S5

-5.5605E-03

-4.2049E-03

-6.2720E-04

0.0000E+00

S6

-1.3950E-02

-4.9510E-03

-1.1353E-03

0.0000E+00

S7

5.7571E-04

-3.0835E-03

-2.1236E-04

0.0000E+00

S8

1.0575E-02

2.5707E-03

-1.3292E-03

0.0000E+00

S9

3.7738E-02

-2.7159E-03

-7.1115E-04

0.0000E+00

S10

3.9523E-03

4.7058E-03

2.3126E-03

0.0000E+00

TABLE 10

Fig. 10A shows on-axis chromatic aberration curves of the imaging lens of embodiment 5, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 10A to 10C, the imaging lens according to embodiment 5 can achieve good imaging quality.

In conclusion, examples 1 to 5 respectively satisfy the relationships shown in table 11.

TABLE 11

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 above-described image pickup lens.

The foregoing description is only exemplary of the preferred embodiments 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 imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a negative optical power;

a second lens having a positive refractive power, an object side surface of which is concave;

a third lens having positive optical power;

a fourth lens having a negative optical power; and

a fifth lens having a positive optical power;

a distance TTL on the optical axis from an object-side surface of the first lens element to an image plane of the imaging lens, a maximum half field angle Semi-FOV of the imaging lens, an F-number Fno of the imaging lens, a center thickness CT1 on the optical axis of the first lens element, and a center thickness CT5 on the optical axis of the fifth lens element satisfy the following conditional expressions:

4.5mm < TTL XFno/tan (Semi-FOV) < 8.0mm; and

3.0＜TTL/(CT1+CT5)≤3.5；

the number of lenses having a refractive power in the imaging lens is five.

2. The imaging lens according to claim 1, characterized in that the imaging lens further comprises a diaphragm between the first lens and the second lens,

the distance T1s between the image side surface of the first lens and the diaphragm on the optical axis, the distance T12 between the image side surface of the first lens and the object side surface of the second lens on the optical axis, and the distance SAG21 between the maximum effective radius vertex of the intersection point of the object side surface of the second lens and the optical axis and the object side surface of the second lens on the optical axis satisfy: -2.0 < (T12-T1 s)/SAG 21 ≦ 1.5.

3. The imaging lens according to claim 1, characterized in that the imaging lens further comprises a diaphragm,

the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DTs of the diaphragm and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: the ratio of (DT 11-DTs)/(DT 52-DTs) is more than or equal to 0.9 and less than or equal to 1.2.

4. The imaging lens according to claim 1, wherein an average value DT3 of the maximum effective radii of the object-side surface and the image-side surface of the third lens, an average value DT4 of the maximum effective radii of the object-side surface and the image-side surface of the fourth lens, and a maximum effective radius DT12 of the image-side surface of the first lens satisfy: 0.9 < (DT 3+ DT 4)/(2 XDT 12) is less than or equal to 1.3.

5. The imaging lens according to claim 1, wherein a half ImgH of a diagonal length of an effective pixel area on the imaging plane and a maximum effective radius DT11 of an object side surface of the first lens satisfy: imgH/DT11 is more than or equal to 1.0 and less than 1.5.

6. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f3 of the third lens satisfy: -3.5 < f1/f3 < -1.5.

7. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens, an effective focal length f2 of the second lens, and an effective focal length f3 of the third lens satisfy: 3.5 < (f 2+ f 3)/f < 6.0.

8. The imaging lens of claim 1, wherein a total effective focal length f of the imaging lens satisfies: f/CT5 is more than or equal to 1.5 and less than 3.0.

9. The imaging lens according to claim 1, wherein an effective focal length f2 of the second lens and a radius of curvature R3 of an object side surface of the second lens satisfy: f2/R3 is more than-2.0 and less than or equal to-0.9.

10. The imaging lens according to claim 1, wherein a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy: 2.0 is less than or equal to (| R3| -R4)/(| R3| + R4) < 3.5.

11. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens and a radius of curvature R1 of an object side surface of the first lens satisfy: f1/R1 is more than 1.5 and less than 3.5.

12. The imaging lens according to claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens and a center thickness CT3 of the third lens on the optical axis satisfy: R5/CT3 is more than 2.0 and less than 5.0.

13. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and a center thickness CT3 of the third lens on the optical axis satisfy: -5.0 < (f 1+ f 3)/CT 3 < -2.0.

14. The imaging lens of any one of claims 1 to 13, wherein a half of a diagonal length ImgH of an effective pixel area on the imaging plane and an entrance pupil diameter EPD of the imaging lens satisfy: TTL/(ImgH/EPD) < 2.0mm is more than or equal to 1.4 mm.