CN109521554B

CN109521554B - Image pickup lens group

Info

Publication number: CN109521554B
Application number: CN201910036101.7A
Authority: CN
Inventors: 肖海东; 徐武超; 贾远林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2024-05-10
Anticipated expiration: 2039-01-15
Also published as: CN109521554A

Abstract

The application discloses an imaging lens group, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens with positive focal power, the object side surface of which is a convex surface; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first lens to the sixth lens has an aspherical surface that is non-rotationally symmetrical; and the effective focal length fx of the imaging lens group in the X-axis direction and the effective focal length fy of the imaging lens group in the Y-axis direction satisfy 0.90 < fx/fy < 1.10.

Description

Image pickup lens group

Technical Field

The present application relates to an imaging lens group, and more particularly, to an imaging lens group including six lenses.

Background

In recent years, with the rapid development of the field of mobile phone imaging and the popularization of chips of large-size and high-pixel Complementary Metal Oxide Semiconductor (CMOS) devices or photosensitive coupling devices (CCDs), manufacturers of large mobile phones have demanded to make the lens thinner and smaller, and at the same time, have made stringent demands on the imaging quality of the lens. Currently, lenses used in portable electronic products such as mobile phones are of six-piece structure, and the lens surfaces are all aspheric surfaces with rotational symmetry (axisymmetry). Such rotationally symmetrical aspherical surfaces can be seen as a curve in the meridian plane which is formed by 360 ° rotation around the optical axis, and thus have sufficient degrees of freedom only in the meridian plane and do not correct off-axis aberrations well.

Disclosure of Invention

The present application provides an imaging lens assembly applicable to a portable electronic product, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.

In one aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative optical power may have a concave image-side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical; and the effective focal length fx of the imaging lens group in the X-axis direction and the effective focal length fy of the imaging lens group in the Y-axis direction can satisfy 0.90 < fx/fy < 1.10.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy 2.00 < (R1 x 10)/R4 < 4.50.

In one embodiment, the effective focal length f6 of the sixth lens and the effective focal length fy in the Y-axis direction of the imaging lens group may satisfy 0.50 < |f6/fy| < 1.50.

In one embodiment, the separation distance T23 of the second lens and the third lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis can satisfy 0.50 < T23/T45 < 2.50.

In one embodiment, the radius of curvature R6 of the image side of the third lens and the radius of curvature R7 of the object side of the fourth lens may satisfy 0.50 < R6/R7 < 2.50.

In one embodiment, the center thickness CT4 of the fourth lens element on the optical axis and the distance TTL between the object side surface of the first lens element and the imaging surface of the imaging lens assembly on the optical axis may satisfy 7.00 < CT4×100/TTL < 11.50.

In one embodiment, the on-axis distance SAG11 from the intersection point of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens and the center thickness CT1 of the first lens on the optical axis may satisfy 0.40 < SAG11/CT1 < 1.00.

In one embodiment, a distance T56 between half of a diagonal line length of an effective pixel region on an imaging surface of the imaging lens group and an optical axis of the fifth lens element and the sixth lens element may satisfy 1.50 < (10×t56)/ImgH < 2.00.

In one embodiment, the effective focal length f4 of the fourth lens and the radius of curvature R10 of the image side of the fifth lens may satisfy 1.00 < f4/R10 < 4.00.

In one embodiment, the center thickness CT1 of the first lens on the optical axis and the distance T12 of the first lens and the second lens on the optical axis can satisfy 4.00 < CT1/T12 < 8.50.

In one embodiment, the sum Σat of the distances between any two adjacent lenses of the first lens element and the sixth lens element on the optical axis and the distance TD between the object side surface of the first lens element and the image side surface of the sixth lens element on the optical axis may satisfy Σat/TD < 0.45.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens group on an optical axis and a half of a diagonal length ImgH of an effective pixel area on the imaging surface of the imaging lens group may satisfy TTL/ImgH < 1.25.

In another aspect, the present application provides an imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical; and the effective focal length f6 of the sixth lens and the effective focal length fy in the Y-axis direction of the imaging lens group can satisfy 0.50 < |f6/fy| < 1.50.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens group on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens group can meet the requirement that TTL/ImgH is less than 1.25.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The interval distance T23 between the second lens and the third lens on the optical axis and the interval distance T45 between the fourth lens and the fifth lens on the optical axis can satisfy 0.50 < T23/T45 < 2.50.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R6 of the image side of the third lens and the curvature radius R7 of the object side of the fourth lens can satisfy 0.50 < R6/R7 < 2.50.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The on-axis distance SAG11 from the intersection point of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens and the center thickness CT1 of the first lens on the optical axis can satisfy 0.40 < SAG11/CT1 < 1.00.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The distance T56 between half of the diagonal line length of the effective pixel region on the imaging surface of the imaging lens group and the fifth lens element and the sixth lens element on the optical axis can satisfy 1.50 < (10×t56)/ImgH < 2.00.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length f4 of the fourth lens and the curvature radius R10 of the image side surface of the fifth lens can satisfy 1.00 < f4/R10 < 4.00.

In still another aspect, the present application provides an imaging lens assembly, which may include, in order from an object side to an image side along an optical axis: a first lens having positive optical power, the object-side surface of which may be convex; a second lens having optical power; a third lens having optical power; a fourth lens having positive optical power; a fifth lens having optical power; the sixth lens with negative focal power has a concave image side surface. Wherein at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The center thickness CT1 of the first lens on the optical axis and the interval distance T12 of the first lens and the second lens on the optical axis can meet the condition that CT1/T12 is more than 4.00 and less than 8.50.

The application adopts a plurality of (for example, six) lenses, and the imaging lens group has at least one beneficial effect of miniaturization, ultra-thinning, high pixels and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing among the lenses and the like. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the imaging lens group are corrected simultaneously, so that the optical performance of the imaging lens group is greatly improved.

Drawings

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

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

Fig. 2 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 1 is within the first quadrant;

fig. 3 is a schematic diagram showing the structure of an imaging lens group according to embodiment 2 of the present application;

Fig. 4 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 2 is within the first quadrant;

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

fig. 6 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 3 is within the first quadrant;

Fig. 7 shows a schematic configuration diagram of an imaging lens group according to embodiment 4 of the present application;

fig. 8 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 4 is within the first quadrant;

fig. 9 shows a schematic configuration diagram of an imaging lens group according to embodiment 5 of the present application;

Fig. 10 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 5 is within the first quadrant;

fig. 11 is a schematic diagram showing the structure of an imaging lens group according to embodiment 6 of the present application;

fig. 12 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 6 is within the first quadrant;

fig. 13 is a schematic diagram showing the structure of an imaging lens group according to embodiment 7 of the present application;

Fig. 14 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 7 is within the first quadrant;

fig. 15 shows a schematic configuration diagram of an imaging lens group according to embodiment 8 of the present application;

fig. 16 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 8 is within the first quadrant;

fig. 17 is a schematic diagram showing the structure of an imaging lens group according to embodiment 9 of the present application;

Fig. 18 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 9 is within the first quadrant.

Detailed Description

For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

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

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

Herein, we define a direction parallel to the optical axis as a Z-axis direction, a direction perpendicular to the Z-axis and lying in a meridian plane as a Y-axis direction, and a direction perpendicular to the Z-axis and lying in a sagittal plane as an X-axis direction. Unless otherwise specified, each parameter symbol (e.g., radius of curvature, etc.) other than the parameter symbol related to the field of view herein represents a characteristic parameter value in the Y-axis direction of the imaging lens group. For example, unless otherwise specified, the reference symbol R1 denotes a value of the radius of curvature R1Y in the Y-axis direction of the object side surface of the first lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

The imaging lens group according to the exemplary embodiment of the present application may include, for example, six lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.

In an exemplary embodiment, the first lens may have positive optical power, and its object-side surface may be convex; the second lens has positive optical power or negative optical power; the third lens has positive optical power or negative optical power; the fourth lens may have positive optical power; the fifth lens has positive optical power or negative optical power; the sixth lens may have negative optical power, and an image side surface thereof may be concave. The focal power of the camera lens group is reasonably configured, when the focal power of the first lens is positive, the focal power of the second lens is negative, the focal power of the sixth lens is negative, and the three are combined, so that the off-axis aberration of the camera lens group can be corrected and the imaging quality can be improved on the premise of ensuring the total length of a smaller optical system.

In addition, the image quality may be further improved by setting the object side surface and/or the image side surface of at least one of the first lens to the sixth lens to an aspherical surface that is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is a free-form surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the introduction of the non-rotationally symmetrical aspheric surface in the lens system is beneficial to effectively correcting off-axis meridian aberration and sagittal aberration, and greatly improving the performance of the optical system. The imaging lens group according to the present application may include at least one non-rotationally symmetrical aspherical surface, for example, one non-rotationally symmetrical aspherical surface, two non-rotationally symmetrical aspherical surfaces, three non-rotationally symmetrical aspherical surfaces, or a plurality of non-rotationally symmetrical aspherical surfaces.

In the following examples, the image side surface of the first lens in example 1, the image side surface of the first lens in example 2, the object side surface of the second lens in example 3, the object side surface of the second lens in example 4, the object side surface and the image side surface of the second lens in example 5, the image side surface of the second lens in example 6, the image side surface of the second lens in example 7, the object side surface of the second lens in example 8, and the object side surface of the second lens in example 9 are all aspherical surfaces which are rotationally asymmetric, i.e., free curved surfaces.

In an exemplary embodiment, the image side of the first lens may be concave; the object side surface of the second lens element may be convex, and the image side surface thereof may be concave; the fifth lens element may have a convex object-side surface and a concave image-side surface.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.90 < fx/fy < 1.10, where fx is an effective focal length in an X-axis direction of the imaging lens group and fy is an effective focal length in a Y-axis direction of the imaging lens group. More specifically, fx and fy may further satisfy 0.98. Ltoreq.fx/fy. Ltoreq.1.03. The focal length ratio in the X-axis and Y-axis directions is reasonably configured, so that the degree of freedom of the free curved surface in two directions is improved, and the correcting effect of the photographing lens group on off-axis aberration is optimized; meanwhile, the aberration and various parameters of the camera lens group are controlled in a proper range, and finally, a high-quality image is obtained.

In an exemplary embodiment, the imaging lens group of the present application may satisfy a condition that TTL/ImgH is less than 1.25, where TTL is a distance between an object side surface of the first lens element and an imaging surface of the imaging lens group on an optical axis, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the imaging lens group. More specifically, TTL and ImgH can further satisfy 1.20.ltoreq.TTL/ImgH < 1.25, e.g., TTL/ImgH=1.23. By controlling the ratio of the total optical length to the image height of the imaging lens group, the ultra-thin structure and high-pixel imaging of the imaging lens group can be realized.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition of 2.00 < (R1 x 10)/R4 < 4.50, where R1 is a radius of curvature of an object side surface of the first lens element and R4 is a radius of curvature of an image side surface of the second lens element. More specifically, R1 and R4 may further satisfy 2.40.ltoreq.R1.ltoreq.10/R4.ltoreq.4.16. By reasonably controlling the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the second lens within a certain range, the distribution of the optical power of the first lens and the second lens of the image pickup lens group can be restrained, and further the aberration correction of the first lens and the second lens can be effectively controlled.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.50 < T23/T45 < 2.50, where T23 is a distance between the second lens and the third lens on the optical axis, and T45 is a distance between the fourth lens and the fifth lens on the optical axis. More specifically, T23 and T45 may further satisfy 0.88.ltoreq.T23/T45.ltoreq.2.06. By restricting the air gaps of the second lens and the third lens and the air gaps of the fourth lens and the fifth lens, the field curvature balance of the imaging lens group can be effectively controlled, so that the imaging lens group has reasonable field curvature.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.50 < R6/R7 < 2.50, where R6 is a radius of curvature of an image side surface of the third lens element and R7 is a radius of curvature of an object side surface of the fourth lens element. More specifically, R6 and R7 may further satisfy 0.67.ltoreq.R6/R7.ltoreq.2.06. The ratio of the curvature radius of the image side surface of the third lens to that of the object side surface of the fourth lens is reasonably set, so that the contribution of the third lens and the fourth lens to astigmatism of the imaging lens group can be reasonably controlled, and the imaging quality of the imaging lens group is improved.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition of 7.00 < CT4×100/TTL < 11.50, where CT4 is a center thickness of the fourth lens element on the optical axis, and TTL is a distance between an object side surface of the first lens element and an imaging surface of the imaging lens group on the optical axis. More specifically, CT4 and TTL can further satisfy CT4 x 100/TTL not more than 7.42 and not more than 11.04. The center thickness of the fourth lens is effectively restrained, good machinability of the imaging lens set can be guaranteed, and the total length TTL of the imaging lens set can be guaranteed to be in a reasonable range.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.40 < SAG11/CT1 < 1.00, where SAG11 is an on-axis distance from an intersection point of an object side surface of the first lens and an optical axis to an effective radius vertex of the object side surface of the first lens, and CT1 is a center thickness of the first lens on the optical axis. More specifically, SAG11 and CT1 may further satisfy 0.46.ltoreq.SAG 11/CT 1.ltoreq.0.86. The incident angle of the principal ray on the object side surface of the first lens can be effectively reduced by meeting the requirements, and the matching degree of the camera lens group and the chip can be improved.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition Σat/TD < 0.45, where Σat is a sum of distances between any two adjacent lenses of the first lens element to the sixth lens element on the optical axis, and TD is a distance between an object side surface of the first lens element and an image side surface of the sixth lens element on the optical axis. More specifically, sigma AT and TD may further satisfy 0.35 Sigma AT/TD < 0.45, e.g., 0.38 Sigma AT/TD < 0.43. The air gaps of the camera lens groups are reasonably distributed, so that the processing and assembling characteristics can be guaranteed, and the problems of front and rear lens interference and the like in the assembling process caused by too small gaps are avoided. Meanwhile, the method is favorable for slowing down light deflection, adjusting the field curvature of the camera lens group, reducing the sensitivity degree and further obtaining better imaging quality.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.50 < |f6/fy| < 1.50, where f6 is an effective focal length of the sixth lens and fy is an effective focal length in the Y-axis direction of the imaging lens group. More specifically, f6 and fy may further satisfy 0.73.ltoreq.f6/fy.ltoreq.1.46. The focal power of the sixth lens is reasonably distributed, the spherical aberration on the meridian direction axis generated by the sixth lens can be restrained in a reasonable interval, and the imaging quality of the view field on the meridian direction axis is ensured.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition that (10×t56)/ImgH < 2.00, where ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the imaging lens group, and T56 is the interval distance between the fifth lens and the sixth lens on the optical axis. More specifically, imgH and T56 further satisfy 1.54+.10×t56)/imgh+.1.78. Through reasonably restricting the ratio of the air interval of the fifth lens and the sixth lens on the optical axis to half of the diagonal length of the effective pixel area on the imaging surface, the problems of the process processing, forming, assembling and other links caused by the excessively thick or excessively thin lenses can be avoided, and meanwhile, the ultrathin characteristic can be ensured.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 1.00 < f4/R10 < 4.00, where f4 is an effective focal length of the fourth lens element and R10 is a radius of curvature of an image side surface of the fifth lens element. More specifically, f4 and R10 may further satisfy 1.25.ltoreq.f4/R10.ltoreq.3.93. By restricting the effective focal length of the fourth lens and the curvature radius of the image side surface of the fifth lens, the focal power of the imaging lens group can be reasonably distributed, the third-order astigmatism amount of the imaging lens group can be controlled to be in a certain range, and the astigmatism amounts generated by the front-end optical element and the rear-end optical element of the imaging lens group are balanced, so that the imaging lens group has good imaging quality.

In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 4.00 < CT1/T12 < 8.50, where CT1 is the center thickness of the first lens on the optical axis, and T12 is the separation distance of the first lens and the second lens on the optical axis. More specifically, CT1 and T12 may further satisfy 4.35.ltoreq.CT1/T12.ltoreq.8.02. By restricting the ratio of the center thickness of the first lens on the optical axis to the air space between the first lens and the second lens on the optical axis, the curvature of field contribution of each field of view can be controlled within a reasonable range, and the size compression of the imaging lens group can be facilitated.

In an exemplary embodiment, the above-described imaging lens group may further include a diaphragm. Alternatively, a diaphragm may be provided between the object side and the first lens. It will be appreciated by those skilled in the art that the aperture may be arranged at any position between the object side and the image side as desired.

Optionally, the above-mentioned imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The imaging lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, six lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing 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 processability of the lens can be improved, so that the camera lens group is more beneficial to production and processing and is applicable to portable electronic products. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the imaging lens group are corrected, so that further image quality improvement can be obtained, and the use requirements of various portable electronic products in an imaging scene can be better met.

In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. 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, the fifth lens, and the sixth lens may be aspherical. Alternatively, 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 may be aspherical surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solution claimed in the present application. For example, although six lenses are described as an example in the embodiment, the imaging lens group is not limited to include six lenses. The imaging lens group may further include other numbers of lenses, if necessary.

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

Example 1

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

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

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the imaging lens group of example 1, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

TABLE 1

It should be understood that the "radius of curvature X" and "conic coefficient X" not specifically indicated (blank) in the above table remain consistent with the corresponding values of "radius of curvature Y" and "conic coefficient Y". The following examples are similar.

As can be seen from table 1, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the object side surface S1 of the first lens element E1 are rotationally symmetrical aspheric surfaces. In the present embodiment, the surface shape x of each rotationally symmetrical aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A ₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈ and A ₂₀ that can be used for each of the aspherical mirror surfaces S1, S3-S12 in example 1 are given in Table 2 below.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.1883E-02

-3.1770E-01

2.8319E+00

-1.3814E+01

4.1223E+01

-7.6204E+01

8.5228E+01

-5.2806E+01

1.3880E+01

S3

-1.3631E-01

3.3631E-01

-1.7071E+00

1.2629E+01

-5.7212E+01

1.5781E+02

-2.6296E+02

2.4160E+02

-9.3775E+01

S4

-4.9030E-02

4.1816E-01

-1.8098E+00

9.7484E+00

-3.1033E+01

5.7215E+01

-5.8410E+01

2.8548E+01

-3.9223E+00

S5

-1.3565E-01

-4.8651E-02

3.9817E-01

-2.0584E+00

6.1337E+00

-1.0838E+01

1.0715E+01

-4.7915E+00

6.4375E-01

S6

-9.7105E-02

-1.6314E-01

2.5244E-01

1.7810E-03

-1.6363E+00

4.2252E+00

-4.9610E+00

2.8436E+00

-6.0788E-01

S7

1.3172E-01

-4.9878E-01

1.1707E+00

-1.8581E+00

1.7890E+00

-1.0594E+00

3.7552E-01

-7.2683E-02

6.0260E-03

S8

2.0981E-01

-8.4627E-01

1.8712E+00

-2.4260E+00

1.9250E+00

-9.4445E-01

2.8009E-01

-4.6195E-02

3.2657E-03

S9

1.7930E-01

-9.2016E-01

1.3786E+00

-1.2843E+00

7.6316E-01

-2.8417E-01

6.3566E-02

-7.7245E-03

3.8646E-04

S10

2.0879E-01

-7.1532E-01

9.1244E-01

-7.2489E-01

3.6958E-01

-1.1959E-01

2.3624E-02

-2.5876E-03

1.2003E-04

S11

-1.6494E-01

2.1272E-01

-1.6460E-01

7.8933E-02

-2.3098E-02

4.1816E-03

-4.6111E-04

2.8575E-05

-7.6757E-07

S12

-2.7308E-01

2.6777E-01

-1.8489E-01

8.3226E-02

-2.4467E-02

4.6212E-03

-5.3955E-04

3.5512E-05

-1.0101E-06

TABLE 2

As can be further seen from table 1, the image side surface S2 of the first lens E1 is an aspherical surface (i.e., AAS surface) which is not rotationally symmetrical, and the surface shape of the aspherical surface is defined by, but not limited to, the following aspherical surface formula which is not rotationally symmetrical:

wherein Z is the sagittal height of the plane parallel to the Z-axis direction; CUX and CUY are the curvatures (=1/radius of curvature) of the vertices of the X, Y axial planes, respectively; KX and KY are cone coefficients in the X, Y axial direction respectively; AR, BR, CR, DR are 4 th order, 6 th order, 8 th order, 10 th order coefficients in the aspheric rotationally symmetric component, respectively; AP, BP, CP, DP are the 4 th, 6 th, 8 th and 10 th order coefficients, respectively, in the aspherical non-rotationally symmetric component. Table 3 below gives the various higher order coefficients of the non-rotationally symmetric aspherical surface S2 that can be used in example 1.

AAS surface	AR	BR	CR	DR	AP	BP	CP	DP
									S2	-0.0823	-0.0091	0.2788	-0.3429	0.0200	-0.1143	0.0030	0.0002

TABLE 3 Table 3

Table 4 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 1, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel area on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	3.25	fx(mm)	3.32
				f2(mm)	-10.83	fy(mm)	3.39
f3(mm)	13.50	TTL(mm)	3.99
				f4(mm)	7.41	ImgH(mm)	3.25
f5(mm)	17.83	Semi-FOV(°)	43.8
				f6(mm)	-2.50

TABLE 4 Table 4

The imaging lens group in embodiment 1 satisfies:

fx/fy=0.98, where fx is an effective focal length in the X-axis direction of the imaging lens group, and fy is an effective focal length in the Y-axis direction of the imaging lens group;

TTL/imgh=1.23, where TTL is the distance between the object side surface S1 of the first lens E1 and the imaging surface S15 on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface S15;

(r1×10)/r4=3.13, wherein R1 is a radius of curvature of the object-side surface S1 of the first lens element E1, and R4 is a radius of curvature of the image-side surface S4 of the second lens element E2;

T23/t45=0.88, where T23 is the separation distance of the second lens E2 and the third lens E3 on the optical axis, and T45 is the separation distance of the fourth lens E4 and the fifth lens E5 on the optical axis;

R6/r7=0.93, wherein R6 is a radius of curvature of the image side surface S6 of the third lens element E3, and R7 is a radius of curvature of the object side surface S7 of the fourth lens element E4;

CT4 x 100/ttl=9.20, wherein CT4 is the center thickness of the fourth lens element E4 on the optical axis, and TTL is the distance between the object side surface S1 of the first lens element E1 and the imaging surface S15 on the optical axis;

SAG 11/ct1=0.79, wherein SAG11 is an on-axis distance from an intersection point of the object side surface S1 of the first lens E1 and the optical axis to an apex of an effective radius of the object side surface S1 of the first lens E1, and CT1 is a center thickness of the first lens E1 on the optical axis;

Σat/td=0.42, where Σat is the sum of the distances between any two adjacent lenses in the first lens element E1 to the sixth lens element E6 on the optical axis, and TD is the distance between the object-side surface S1 of the first lens element E1 and the image-side surface S12 of the sixth lens element E6 on the optical axis;

f6/fy|=0.74, where f6 is an effective focal length of the sixth lens E6, and fy is an effective focal length in the Y-axis direction of the imaging lens group;

(10×t56)/imgh=1.57, where ImgH is half the diagonal length of the effective pixel region on the imaging surface S15, and T56 is the interval distance between the fifth lens E5 and the sixth lens E6 on the optical axis;

f4/r10=1.25, where f4 is the effective focal length of the fourth lens element E4, and R10 is the radius of curvature of the image-side surface S10 of the fifth lens element E5;

CT 1/t12=4.90, where CT1 is the center thickness of the first lens E1 on the optical axis, and T12 is the separation distance of the first lens E1 and the second lens E2 on the optical axis.

Fig. 2 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 1 at different image height positions in the first quadrant. As can be seen from fig. 2, the imaging lens group provided in embodiment 1 can achieve good imaging quality.

Example 2

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

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

Table 5 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 2, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

TABLE 5

As can be seen from table 5, in example 2, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the object side surface S1 of the first lens element E1 are rotationally symmetrical aspherical surfaces; the image side surface S2 of the first lens E1 is an aspherical surface that is non-rotationally symmetrical.

Table 6 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in example 2, where each aspherical surface profile can be defined by equation (1) given in example 1 above. Table 7 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S2 in embodiment 2, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.0740E-02

-2.8857E-01

2.5937E+00

-1.2949E+01

4.0094E+01

-7.7675E+01

9.1798E+01

-6.0545E+01

1.7069E+01

S3

-1.3265E-01

2.9329E-01

-1.4514E+00

1.1963E+01

-5.7682E+01

1.6541E+02

-2.8270E+02

2.6417E+02

-1.0375E+02

S4

-5.8703E-02

5.8898E-01

-3.4443E+00

1.9171E+01

-6.5184E+01

1.3561E+02

-1.6898E+02

1.1604E+02

-3.3677E+01

S5

-1.2799E-01

-1.3839E-01

9.3919E-01

-3.8790E+00

9.3176E+00

-1.2517E+01

7.5066E+00

7.5665E-01

-1.9036E+00

S6

-1.0410E-01

-4.4125E-02

-6.0974E-01

3.5324E+00

-1.0440E+01

1.7784E+01

-1.7535E+01

9.2727E+00

-1.9987E+00

S7

1.2633E-01

-4.4626E-01

9.4647E-01

-1.3122E+00

9.8290E-01

-3.2810E-01

-2.1407E-02

4.5382E-02

-8.7640E-03

S8

2.1367E-01

-8.7096E-01

1.9364E+00

-2.5192E+00

2.0030E+00

-9.8364E-01

2.9161E-01

-4.8000E-02

3.3804E-03

S9

1.8269E-01

-9.3295E-01

1.3973E+00

-1.2926E+00

7.5752E-01

-2.7612E-01

5.9851E-02

-6.9343E-03

3.2108E-04

S10

2.1137E-01

-7.2546E-01

9.3065E-01

-7.4262E-01

3.7998E-01

-1.2339E-01

2.4469E-02

-2.6922E-03

1.2556E-04

S11

-1.6401E-01

2.0961E-01

-1.6071E-01

7.6439E-02

-2.2171E-02

3.9745E-03

-4.3365E-04

2.6585E-05

-7.0676E-07

S12

-2.7065E-01

2.6618E-01

-1.8519E-01

8.4204E-02

-2.5013E-02

4.7711E-03

-5.6199E-04

3.7260E-05

-1.0654E-06

TABLE 6

AAS surface	AR	BR	CR	DR	AP	BP	CP	DP
									S2	-0.0824	-0.0089	0.2789	-0.3432	0.0086	0.0010	0.0010	-0.0013

TABLE 7

Table 8 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 2, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	3.53	fx(mm)	3.34
				f2(mm)	-10.54	fy(mm)	3.38
f3(mm)	13.43	TTL(mm)	3.99
				f4(mm)	7.50	ImgH(mm)	3.25
f5(mm)	16.94	Semi-FOV(°)	43.8
				f6(mm)	-2.50

TABLE 8

Fig. 4 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 2 at different image height positions in the first quadrant. As can be seen from fig. 4, the imaging lens group provided in embodiment 2 can achieve good imaging quality.

Example 3

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

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

Table 9 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 3, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

TABLE 9

As can be seen from table 9, in example 3, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the image side surface S4 of the second lens element E2 are rotationally symmetrical aspheric surfaces; the object side surface S3 of the second lens element E2 is an aspheric surface with non-rotational symmetry.

Table 10 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in embodiment 3, where each aspherical surface profile can be defined by the formula (1) given in embodiment 1 above. Table 11 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S3 in embodiment 3, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Table 10

AAS surface	AR	BR	CR	DR	AP	BP	CP	DP
									S3	-0.1267	0.1609	0.1471	-0.3175	0.0077	0.0086	0.0047	0.0031

TABLE 11

Table 12 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 3, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	3.64	fx(mm)	3.32
				f2(mm)	-11.30	fy(mm)	3.28
f3(mm)	13.21	TTL(mm)	3.99
				f4(mm)	7.41	ImgH(mm)	3.25
f5(mm)	15.42	Semi-FOV(°)	44.1
				f6(mm)	-2.50

Table 12

Fig. 6 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 3 at different image height positions in the first quadrant. As can be seen from fig. 6, the imaging lens group provided in embodiment 3 can achieve good imaging quality.

Example 4

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

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

Table 13 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 4, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

TABLE 13

As can be seen from table 13, in example 4, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the image side surface S4 of the second lens element E2 are rotationally symmetrical aspheric surfaces; the object side surface S3 of the second lens element E2 is an aspheric surface with non-rotational symmetry.

Table 14 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in example 4, where each aspherical surface profile can be defined by equation (1) given in example 1 above. Table 15 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S3 in embodiment 4, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.2829E-02

3.3544E-01

-2.7906E+00

1.2962E+01

-3.4030E+01

5.0230E+01

-3.7249E+01

8.0911E+00

2.8201E+00

S2

-7.3924E-02

-3.6846E-01

6.2648E+00

-4.9105E+01

2.2294E+02

-6.0354E+02

9.6075E+02

-8.3111E+02

3.0151E+02

S4

-3.6641E-02

1.0636E-01

1.8548E+00

-1.4952E+01

6.8422E+01

-1.8572E+02

2.9561E+02

-2.5507E+02

9.2290E+01

S5

-1.3588E-01

-3.9788E-02

3.2094E-01

-2.1556E+00

7.9331E+00

-1.5661E+01

1.5789E+01

-6.3084E+00

1.9501E-01

S6

-9.0656E-02

-1.8283E-01

3.6703E-01

-6.3540E-01

2.9609E-01

8.5571E-01

-1.5121E+00

8.9081E-01

-1.3286E-01

S7

1.1689E-01

-3.6343E-01

6.6397E-01

-7.4156E-01

2.4598E-01

2.8523E-01

-3.3615E-01

1.3512E-01

-1.9576E-02

S8

2.1633E-01

-9.0030E-01

2.0369E+00

-2.6985E+00

2.1867E+00

-1.0948E+00

3.3076E-01

-5.5396E-02

3.9593E-03

S9

1.6978E-01

-8.6071E-01

1.2117E+00

-1.0279E+00

5.2713E-01

-1.5014E-01

1.7517E-02

1.0453E-03

-3.2275E-04

S10

2.0178E-01

-6.7231E-01

8.2577E-01

-6.3509E-01

3.1607E-01

-1.0056E-01

1.9643E-02

-2.1374E-03

9.8875E-05

S11

-1.6149E-01

2.0592E-01

-1.5683E-01

7.2527E-02

-1.9804E-02

3.1903E-03

-2.9086E-04

1.3069E-05

-1.8470E-07

S12

-2.3867E-01

2.0288E-01

-1.2456E-01

5.0508E-02

-1.3477E-02

2.3024E-03

-2.3952E-04

1.3694E-05

-3.2603E-07

TABLE 14

AAS surface	AR	BR	CR	DR	AP	BP	CP	DP
									S3	-0.1266	0.1601	0.1457	-0.3189	0.0081	0.0024	0.0029	-0.0003

TABLE 15

Table 16 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 4, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	3.63	fx(mm)	3.35
				f2(mm)	-10.82	fy(mm)	3.29
f3(mm)	13.41	TTL(mm)	4.00
				f4(mm)	7.24	ImgH(mm)	3.25
f5(mm)	15.73	Semi-FOV(°)	44.0
				f6(mm)	-2.50

Table 16

Fig. 8 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 4 at different image height positions in the first quadrant. As can be seen from fig. 8, the imaging lens group provided in embodiment 4 can achieve good imaging quality.

Example 5

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

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

Table 17 shows the surface type, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the imaging lens group of example 5, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

TABLE 17

As can be seen from table 17, in example 5, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 are rotationally symmetrical aspherical surfaces; the object side surface S3 and the image side surface S4 of the second lens element E2 are aspheric with non-rotational symmetry.

Table 18 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in embodiment 5, where each aspherical surface profile can be defined by the formula (1) given in embodiment 1 above. Table 19 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S3 and S4 in embodiment 5, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

9.3311E-03

-1.0171E-01

1.2057E+00

-7.1544E+00

2.5963E+01

-5.8681E+01

8.0683E+01

-6.1638E+01

1.9986E+01

S2

-7.3164E-02

-1.3546E-01

2.5580E+00

-1.9170E+01

8.4198E+01

-2.2133E+02

3.4166E+02

-2.8606E+02

1.0010E+02

S5

-1.3610E-01

1.1123E-01

-8.7382E-01

3.4868E+00

-8.5845E+00

1.3748E+01

-1.4565E+01

9.9050E+00

-3.1650E+00

S6

-9.6738E-02

-1.3374E-01

1.0592E-01

5.1442E-01

-3.0465E+00

6.9568E+00

-8.1984E+00

4.9226E+00

-1.1680E+00

S7

1.1216E-01

-2.7841E-01

3.7769E-01

-2.4848E-01

-1.8434E-01

4.1974E-01

-2.8204E-01

8.5722E-02

-9.9000E-03

S8

2.0715E-01

-8.1773E-01

1.7621E+00

-2.2157E+00

1.6955E+00

-7.9624E-01

2.2386E-01

-3.4585E-02

2.2580E-03

S9

1.6664E-01

-8.2392E-01

1.1514E+00

-9.8959E-01

5.3974E-01

-1.8388E-01

3.7480E-02

-4.1155E-03

1.8253E-04

S10

2.1295E-01

-6.8524E-01

8.3510E-01

-6.3519E-01

3.1152E-01

-9.7475E-02

1.8712E-02

-2.0017E-03

9.1163E-05

S11

-1.4709E-01

1.6837E-01

-1.1452E-01

4.7748E-02

-1.1696E-02

1.6630E-03

-1.2962E-04

4.6026E-06

-3.3151E-08

S12

-2.8375E-01

2.8665E-01

-2.0154E-01

9.2470E-02

-2.7544E-02

5.2273E-03

-6.0813E-04

3.9551E-05

-1.1024E-06

TABLE 18

AAS surface	AR	BR	CR	DR	AP	BP	CP	DP
									S3	-0.1182	0.1492	0.1210	-0.2613	0.0072	0.0228	0.0075	0.0051
S4	-0.0429	0.2542	-0.1331	0.1106	-0.0864	-0.0128	0.0006	0.0268

TABLE 19

Table 20 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 5, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel area on the imaging surface S15, and a maximum half field angle Semi-FOV.

Table 20

Fig. 10 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 5 at different image height positions in the first quadrant. As can be seen from fig. 10, the imaging lens group provided in embodiment 5 can achieve good imaging quality.

Example 6

An imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 and 12. Fig. 11 shows a schematic configuration diagram of an imaging lens group according to embodiment 6 of the present application.

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

Table 21 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 6, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

Table 21

As can be seen from table 21, in example 6, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the object side surface S3 of the second lens element E2 are rotationally symmetrical aspherical surfaces; the image side surface S4 of the second lens E2 is an aspherical surface with non-rotational symmetry.

Table 22 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in example 6, where each aspherical surface profile can be defined by equation (1) given in example 1 above. Table 23 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S4 in embodiment 6, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.0207E-02

2.4966E-01

-2.1804E+00

1.1856E+01

-3.9460E+01

8.1589E+01

-1.0211E+02

7.0941E+01

-2.1055E+01

S2

-9.0205E-02

1.8094E-01

-1.4524E+00

9.9537E+00

-4.0907E+01

1.0372E+02

-1.5974E+02

1.3656E+02

-5.0022E+01

S3

-1.6152E-01

9.4858E-01

-8.8133E+00

6.0389E+01

-2.5518E+02

6.6922E+02

-1.0641E+03

9.3845E+02

-3.5228E+02

S5

-1.4588E-01

7.7528E-02

-7.1106E-01

3.6154E+00

-1.1698E+01

2.4378E+01

-3.2065E+01

2.4676E+01

-8.2173E+00

S6

-9.5307E-02

-2.1188E-01

4.9764E-01

-6.5492E-01

-7.9192E-01

4.0308E+00

-5.7236E+00

3.6943E+00

-8.9002E-01

S7

1.1258E-01

-3.2978E-01

5.2373E-01

-3.9416E-01

-2.6358E-01

7.2367E-01

-5.5460E-01

1.9364E-01

-2.6105E-02

S8

2.5321E-01

-1.2139E+00

3.1331E+00

-4.7012E+00

4.3152E+00

-2.4590E+00

8.5018E-01

-1.6355E-01

1.3437E-02

S9

1.9373E-01

-1.0072E+00

1.5078E+00

-1.3654E+00

7.6282E-01

-2.5459E-01

4.6886E-02

-3.8269E-03

4.2944E-05

S10

2.3118E-01

-8.1936E-01

1.0839E+00

-8.8685E-01

4.6361E-01

-1.5346E-01

3.0977E-02

-3.4663E-03

1.6432E-04

S11

-1.6537E-01

2.1312E-01

-1.6303E-01

7.6590E-02

-2.1777E-02

3.8002E-03

-4.0105E-04

2.3665E-05

-6.0420E-07

S12

-3.0482E-01

3.1034E-01

-2.1962E-01

1.0201E-01

-3.1102E-02

6.1031E-03

-7.3961E-04

5.0373E-05

-1.4759E-06

Table 22

AAS surface	AR	BR	CR	DR	AP	BP	CP	DP
									S4	-0.0462	0.2795	-0.1543	0.1293	0.0339	0.0099	-0.0033	-0.0139

Table 23

Table 24 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 6, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel area on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	3.38	fx(mm)	3.35
				f2(mm)	-9.93	fy(mm)	3.38
f3(mm)	13.37	TTL(mm)	4.00
				f4(mm)	8.06	ImgH(mm)	3.25
f5(mm)	18.37	Semi-FOV(°)	42.6
				f6(mm)	-2.46

Table 24

Fig. 12 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 6 at different image height positions in the first quadrant. As can be seen from fig. 12, the imaging lens group provided in embodiment 6 can achieve good imaging quality.

Example 7

An imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 and 14. Fig. 13 shows a schematic configuration diagram of an imaging lens group according to embodiment 7 of the present application.

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

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 7, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

Table 25

As can be seen from table 25, in example 7, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the object side surface S3 of the second lens element E2 are rotationally symmetrical aspherical surfaces; the image side surface S4 of the second lens E2 is an aspherical surface with non-rotational symmetry.

Table 26 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in example 7, where each aspherical surface profile can be defined by equation (1) given in example 1 above. Table 27 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S4 in embodiment 7, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Table 26

AAS surface

AR

BR

CR

DR

AP

BP

CP

DP

S4

3.6072E-02

-1.4837E-01

5.5371E-01

-2.4455E-01

1.4279E-02

-3.0956E-04

-3.6750E-04

1.6822E-03

Table 27

Table 28 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 7, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel area on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	7.95	fx(mm)	3.06
				f2(mm)	7.12	fy(mm)	3.03
f3(mm)	15.60	TTL(mm)	4.00
				f4(mm)	4.08	ImgH(mm)	3.25
f5(mm)	-5.94	Semi-FOV(°)	44.1
				f6(mm)	-4.42

Table 28

Fig. 14 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 7 at different image height positions in the first quadrant. As can be seen from fig. 14, the imaging lens group provided in embodiment 7 can achieve good imaging quality.

Example 8

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

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

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

Table 29 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 8, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

Table 29

As can be seen from table 29, in example 8, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the image side surface S4 of the second lens element E2 are rotationally symmetrical aspheric surfaces; the object side surface S3 of the second lens element E2 is an aspheric surface with non-rotational symmetry.

Table 30 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in example 8, where each aspherical surface profile can be defined by equation (1) given in example 1 above. Table 31 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S4 in embodiment 8, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.9537E-03

-9.9426E-02

2.3185E+00

-1.7787E+01

7.3437E+01

-1.7700E+02

2.4944E+02

-1.9051E+02

6.0866E+01

S2

-4.3128E-02

4.9039E-02

-1.8511E-01

3.4161E+00

-2.1949E+01

7.1888E+01

-1.3232E+02

1.3008E+02

-5.3557E+01

S4

3.0572E-02

9.6325E-02

4.9639E-01

5.7857E+00

-7.3226E+01

3.1645E+02

-6.7122E+02

7.0896E+02

-2.9821E+02

S5

-3.0855E-01

1.5671E+00

-1.1019E+01

4.8577E+01

-1.3647E+02

2.4326E+02

-2.6603E+02

1.6337E+02

-4.3133E+01

S6

-7.6068E-01

3.4898E+00

-1.5266E+01

4.4272E+01

-8.4301E+01

1.0302E+02

-7.7375E+01

3.2468E+01

-5.8160E+00

S7

-8.9001E-01

3.0918E+00

-7.8348E+00

1.3899E+01

-1.7143E+01

1.4024E+01

-7.1459E+00

2.0363E+00

-2.4674E-01

S8

-8.3801E-01

1.8280E+00

-2.1625E+00

1.4778E+00

-5.2858E-01

3.8450E-02

4.0692E-02

-1.4312E-02

1.5231E-03

S9

-4.8883E-01

5.5450E-01

-5.8241E-01

4.0644E-01

-1.8429E-01

5.4922E-02

-1.0515E-02

1.1927E-03

-6.2200E-05

S10

-1.5068E-01

3.9751E-02

-3.7550E-02

2.7125E-02

-1.4119E-02

5.3971E-03

-1.3629E-03

1.9735E-04

-1.2273E-05

S11

-3.2408E-01

3.7504E-01

-2.7822E-01

1.3815E-01

-4.4176E-02

9.0179E-03

-1.1425E-03

8.2190E-05

-2.5727E-06

S12

-2.9003E-01

2.0364E-01

-1.1114E-01

4.5777E-02

-1.3112E-02

2.4591E-03

-2.8493E-04

1.8429E-05

-5.0830E-07

Table 30

AAS surface

AR

BR

CR

DR

AP

BP

CP

DP

S3

-4.5485E-02

1.3112E-01

-2.6117E-02

-1.1493E-01

1.3122E-01

6.4113E-02

-7.1519E-02

6.1192E-02

Table 31

Table 32 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 8, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel area on the imaging surface S15, and a maximum half field angle Semi-FOV.

f1(mm)	2.73	fx(mm)	3.44
				f2(mm)	-6.56	fy(mm)	3.37
f3(mm)	-7.00	TTL(mm)	4.00
				f4(mm)	8.79	ImgH(mm)	3.25
f5(mm)	5.02	Semi-FOV(°)	38.9
				f6(mm)	-3.37

Table 32

Fig. 16 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 8 at different image height positions in the first quadrant. As can be seen from fig. 16, the imaging lens group provided in embodiment 8 can achieve good imaging quality.

Example 9

An imaging lens group according to embodiment 9 of the present application is described below with reference to fig. 17 and 18. Fig. 17 shows a schematic configuration diagram of an imaging lens group according to embodiment 9 of the present application.

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

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

Table 33 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 9, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).

Table 33

As can be seen from table 33, in example 9, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 and the image side surface S4 of the second lens element E2 are rotationally symmetrical aspheric surfaces; the object side surface S3 of the second lens element E2 is an aspheric surface with non-rotational symmetry.

Table 34 shows the higher order coefficients that can be used for each rotationally symmetric aspherical mirror in example 9, where each aspherical surface profile can be defined by equation (1) given in example 1 above. Table 35 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S4 in embodiment 9, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-5.5435E-03

2.4479E-01

-2.1929E+00

1.1904E+01

-3.9268E+01

8.0204E+01

-9.8974E+01

6.7621E+01

-1.9688E+01

S2

-1.0813E-01

2.1293E-01

-7.0429E-01

2.5357E+00

-4.0541E+00

-3.2068E+00

2.1274E+01

-2.9474E+01

1.4034E+01

S4

-3.2532E-02

2.0498E-01

3.2557E-01

-1.5349E+00

3.3424E+00

-4.1674E+00

2.9573E+00

-4.6435E-01

-3.9804E-01

S5

-1.3686E-01

1.7359E-01

-1.7673E+00

9.9359E+00

-3.4409E+01

7.3997E+01

-9.6058E+01

6.8969E+01

-2.0804E+01

S6

-8.1451E-02

-1.9618E-01

7.6653E-01

-2.9527E+00

7.3890E+00

-1.1644E+01

1.1203E+01

-6.0157E+00

1.3954E+00

S7

1.6268E-01

-4.7794E-02

-8.4367E-01

2.3781E+00

-3.5439E+00

3.1320E+00

-1.6254E+00

4.5564E-01

-5.3079E-02

S8

6.1954E-01

-1.4326E+00

2.3691E+00

-2.7075E+00

2.0485E+00

-9.8848E-01

2.9062E-01

-4.7344E-02

3.2716E-03

S9

2.9396E-01

-1.2539E+00

2.1320E+00

-2.3102E+00

1.6178E+00

-7.2653E-01

2.0237E-01

-3.1877E-02

2.1723E-03

S10

-1.1005E-01

-2.0425E-01

3.6789E-01

-3.4157E-01

1.8663E-01

-6.1150E-02

1.1717E-02

-1.1944E-03

4.8950E-05

S11

-5.3416E-01

4.6377E-01

-2.6100E-01

9.8269E-02

-2.3932E-02

3.6754E-03

-3.3984E-04

1.6967E-05

-3.3944E-07

S12

-4.5734E-01

3.9786E-01

-2.4444E-01

1.0111E-01

-2.7487E-02

4.7970E-03

-5.1584E-04

3.1114E-05

-8.0617E-07

Watch 34

AAS surface

AR

BR

CR

DR

AP

BP

CP

DP

S3

-1.5017E-01

2.8871E-01

-1.1597E-01

-1.1767E-01

1.3979E-02

8.2877E-03

-1.7152E-02

2.2974E-02

Table 35

Table 36 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 9, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15, and a maximum half field angle Semi-FOV.

Table 36

Fig. 18 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 9 at different image height positions in the first quadrant. As can be seen from fig. 18, the imaging lens group according to embodiment 9 can achieve good imaging quality.

In summary, examples 1 to 9 each satisfy the relationship shown in table 37.

Conditional\embodiment	1	2	3	4	5	6	7	8	9
										fx/fy	0.98	0.99	1.01	1.02	1.03	0.99	1.01	1.02	1.01
TTL/ImgH	1.23	1.23	1.23	1.23	1.23	1.23	1.23	1.23	1.23
										(R1*10)/R4	3.13	3.14	3.25	3.32	2.40	3.16	3.37	3.57	4.16
T23/T45	0.88	0.89	0.97	0.96	1.04	0.99	1.50	1.49	2.06
										R6/R7	0.93	0.94	1.05	1.09	1.16	1.03	0.67	2.03	2.06
CT4*100/TTL	9.20	9.14	9.17	9.05	7.73	8.92	11.04	7.42	8.74
										SAG11/CT1	0.79	0.77	0.86	0.85	0.59	0.62	0.46	0.58	0.57
∑AT/TD	0.42	0.43	0.43	0.43	0.43	0.42	0.38	0.42	0.43
										\|f6/fy\|	0.74	0.74	0.76	0.76	0.76	0.73	1.46	1.00	1.17
(10*T56)/ImgH	1.57	1.57	1.60	1.60	1.58	1.54	1.63	1.78	1.63
										f4/R10	1.25	1.29	1.32	1.29	1.69	1.40	1.41	3.93	1.71
CT1/T12	4.90	4.85	4.72	4.75	4.35	4.83	8.02	7.58	5.71

Table 37

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

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. The imaging lens assembly is characterized by comprising, in order from an object side to an image side along an optical axis:

The first lens with positive focal power has a convex object side surface and a concave image side surface;

The object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

A third lens having optical power;

A fourth lens having positive optical power;

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

A sixth lens having negative optical power, an image-side surface of which is a concave surface;

the number of lenses with focal power of the imaging lens group is six;

the first lens or the second lens has an aspherical surface that is non-rotationally symmetrical;

The third lens has positive focal power, and the positive and negative attributes of the signs of the focal power of the second lens and the fifth lens are opposite; or the second lens has negative focal power, and the positive and negative attributes of the signs of the focal power of the third lens and the fifth lens are opposite;

The effective focal length fx of the image pickup lens group in the X-axis direction and the effective focal length fy of the image pickup lens group in the Y-axis direction meet 0.90 < fx/fy not less than 0.99,1.01 < fx/fy < 1.10, wherein the X-axis direction is a direction perpendicular to the optical axis and positioned in a sagittal plane, and the Y-axis direction is a direction perpendicular to the optical axis and positioned in a meridian plane;

An effective focal length f6 of the sixth lens and an effective focal length fy of the imaging lens group in a Y-axis direction satisfy 0.50 < |f6/fy| < 1.50;

An on-axis distance SAG11 from an intersection point of 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 and a center thickness CT1 of the first lens on the optical axis satisfy 0.40 < SAG11/CT1 < 1.00; and

The effective focal length f4 of the fourth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy 1.00 < f4/R10 < 4.00.

2. The imaging lens system according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens element and a radius of curvature R4 of an image side surface of the second lens element satisfy 2.00 < (r1×10)/R4 < 4.50.

3. The imaging lens system according to claim 1, wherein a separation distance T23 of the second lens and the third lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy 0.50 < T23/T45 < 2.50.

4. The imaging lens system according to claim 1, wherein a radius of curvature R6 of an image side surface of the third lens element and a radius of curvature R7 of an object side surface of the fourth lens element satisfy 0.50 < R6/R7 < 2.50.

5. The imaging lens assembly according to claim 1, wherein a center thickness CT4 of the fourth lens element on the optical axis and a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens assembly on the optical axis satisfy 7.00 < CT4 x 100/TTL < 11.50.

6. The imaging lens group according to claim 1, wherein a distance T56 between a half of a diagonal length of an effective pixel region on an imaging surface of the imaging lens group and the fifth lens and the sixth lens on the optical axis satisfies 1.50 < (10×t56)/ImgH < 2.00.

7. The imaging lens system according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy 4.00 < CT1/T12 < 8.50.

8. The imaging lens system according to any one of claims 1 to 7, wherein a sum Σat of separation distances on the optical axis of any adjacent two lenses of the first lens to the sixth lens and a distance TD on the optical axis of an object side surface of the first lens to an image side surface of the sixth lens satisfy 0.35 Σat/TD < 0.45.

9. The imaging lens group according to any one of claims 1 to 7, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens group on the optical axis and a half of a diagonal length ImgH of an effective pixel region on the imaging surface of the imaging lens group satisfy 1.20 ∈ttl/ImgH < 1.25.