CN216792569U - Imaging lens group - Google Patents
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- CN216792569U CN216792569U CN202220464465.2U CN202220464465U CN216792569U CN 216792569 U CN216792569 U CN 216792569U CN 202220464465 U CN202220464465 U CN 202220464465U CN 216792569 U CN216792569 U CN 216792569U
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Abstract
The utility model provides an imaging lens group. The imaging lens group comprises from the shot object side to the image side in sequence: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the sixth lens has positive focal power; distortion DIST of imaging lens set at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the most imaging lens groupThe large half field angle Semi-FOV, half imgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface satisfy the following conditions: 0.8<ImgH*tan(Semi‑FOV)/TTL<1. The utility model solves the problem that the imaging lens group in the prior art has wide angle and high image quality which are difficult to realize simultaneously.
Description
Technical Field
The utility model relates to the technical field of optical imaging equipment, in particular to an imaging lens group.
Background
At present, the mobile phone market develops fiercely, and with various requirements of users on mobile phone photographing functions, an imaging lens group on the mobile phone becomes a key of current design, and meanwhile, the imaging lens group needs to be ensured to have better imaging quality. In order to realize different photographing functions, the number of camera modules adopted on the mobile phone is gradually increased, and multi-camera mobile phones with six cameras, seven cameras and the like become a trend. Taking the latest mobile phones in the market as an example, a wide-angle lens is carried as a secondary camera at present, so that the mobile phones have a more professional photographing function, and a photographed picture is clearer, so that the FOV is improved to a greater extent on the basis of keeping the image quality improved, and the small distortion is kept, which is a main research direction of the wide-angle lens on the mobile phones at present.
That is to say, the imaging lens group in the prior art has the problem that the wide angle and the high image quality are difficult to be realized simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide an imaging lens group to solve the problem that the wide angle and high image quality of the imaging lens group in the prior art are difficult to realize at the same time.
In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens assembly, sequentially from an object side to an image side, comprising: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the sixth lens has positive focal power; distortion DIST of imaging lens set at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the maximum half field angle Semi-FOV of the imaging lens group, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the on-axis distance TTL from the shot object detection surface of the first lens to the imaging surface meet the following conditions: 0.8<ImgH*tan(Semi-FOV)/TTL<1。
Further, an on-axis distance SD from the diaphragm to the image side surface of the sixth lens and an on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens satisfy: 0.5< SD/TD < 0.65.
Further, an on-axis distance BFL from the image-side surface of the sixth lens to the imaging surface and the effective focal length f of the imaging lens group satisfy: 0.55< BFL/f < 0.65.
Further, the maximum half field angle Semi-FOV of the imaging lens group, the on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and the entrance pupil diameter EPD of the imaging lens group satisfy: 0.2< EPD tan (Semi-FOV)/TD < 0.35.
Further, the focal length f1 of the first lens, the focal length f2 of the second lens and the combined focal length f12 of the first lens and the second lens satisfy the following conditions: 1< (f1-f2)/f12< 1.5.
Further, the effective focal length f of the imaging lens group and the combined focal length f2 of the second lens and the third lens satisfy the following relation: 0.9< f23/f < 1.1.
Further, the focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 0.7< (R3+ R4)/f2< 0.8.
Further, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9< (R5-R6)/(R3+ R4) < 1.2.
Further, the maximum center thickness CT in the first to sixth lensesMAXThe maximum air interval AT on the optical axis between the adjacent two lenses of the first lens to the sixth lensMAXSatisfies the following conditions: 0.8<ATMAX/CTMAX<1。
Further, the sum Σ AT of the air intervals on the optical axis between two adjacent lenses in the first to sixth lenses and the axial distance BFL from the image side surface of the sixth lens to the image forming surface satisfy: 0.7< BFL/SIGMA AT < 0.8.
Further, the central thickness CT1 of the first lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.7< CT1/CT6< 0.9.
Further, the distance T12 between the first lens and the second lens, the distance T23 between the second lens and the third lens, and the distance T34 between the third lens and the fourth lens satisfy: 0.9< (T23+ T34)/T12< 1.
Further, the edge thickness ET3 of the third lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 0.4< ET3/CT3< 0.6.
Further, the edge thickness ET1 of the first lens on the optical axis, the edge thickness ET2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 0.9< (ET1+ ET2)/(CT1+ CT2) < 1.1.
Further, an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis to an effective radius vertex of the image side surface of the third lens and an on-axis distance SAG41 between an intersection point of the object side surface of the fourth lens and the optical axis to an effective radius vertex of the object side surface of the fourth lens satisfy: 0.8< SAG32/SAG41< 1.1.
Further, the effective radius DT11 of the object side surface of the first lens, the effective radius DT31 of the object side surface of the third lens, the effective radius DT32 of the image side surface of the third lens, and the effective radius DT62 of the image side surface of the sixth lens satisfy: 0.8< (DT11-DT31)/(DT62-DT32) < 1.1.
Further, the effective radius DT32 of the image side surface of the third lens and the effective radius DT62 of the image side surface of the sixth lens satisfy: 0.2< DT32/DT62< 0.4.
According to another aspect of the present invention, an imaging lens assembly is provided, which includes, in order from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens element; the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the maximum half field angle Semi-FOV of the imaging lens group, half ImgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface meet the following requirements: 0.8< ImgH tan (Semi-FOV)/TTL < 1; the edge thickness ET1 of the first lens on the optical axis, the edge thickness ET2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy the following conditions: 0.9< (ET1+ ET2)/(CT1+ CT2) < 1.1.
Further, the sixth lens has positive optical power; distortion DIST of imaging lens group at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the on-axis distance SD from the diaphragm to the image side surface of the sixth lens and the on-axis distance TD from the shot object side surface of the first lens to the image side surface of the sixth lens satisfy the following conditions: 0.5<SD/TD<0.65。
Further, an on-axis distance BFL from the image-side surface of the sixth lens to the imaging surface and the effective focal length f of the imaging lens group satisfy: 0.55< BFL/f < 0.65.
Further, the maximum half field angle Semi-FOV of the imaging lens group, the on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and the entrance pupil diameter EPD of the imaging lens group satisfy: 0.2< EPD tan (Semi-FOV)/TD < 0.35.
Further, the focal length f1 of the first lens, the focal length f2 of the second lens and the combined focal length f12 of the first lens and the second lens satisfy the following conditions: 1< (f1-f2)/f12< 1.5.
Further, the effective focal length f of the imaging lens group and the combined focal length f2 of the second lens and the third lens satisfy: 0.9< f23/f < 1.1.
Further, the focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 0.7< (R3+ R4)/f2< 0.8.
Further, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9< (R5-R6)/(R3+ R4) < 1.2.
Further, the maximum center thickness CT in the first to sixth lensesMAXThe maximum air interval AT on the optical axis between the adjacent two lenses of the first lens to the sixth lensMAXSatisfies the following conditions: 0.8<ATMAX/CTMAX<1。
Further, the sum Σ AT of the air spaces on the optical axis between adjacent two lenses in the first to sixth lenses and the on-axis distance BFL from the image-side surface of the sixth lens to the imaging surface satisfy: 0.7< BFL/SIGMA AT < 0.8.
Further, the central thickness CT1 of the first lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.7< CT1/CT6< 0.9.
Further, the pitch T12 of the first and second lenses, the pitch T23 of the second and third lenses, and the pitch T34 of the third and fourth lenses satisfy: 0.9< (T23+ T34)/T12< 1.
Further, the edge thickness ET3 of the third lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 0.4< ET3/CT3< 0.6.
Further, an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis to an effective radius vertex of the image side surface of the third lens and an on-axis distance SAG41 between an intersection point of the object side surface of the fourth lens and the optical axis to an effective radius vertex of the object side surface of the fourth lens satisfy: 0.8< SAG32/SAG41< 1.1.
Further, the effective radius DT11 of the object side surface of the first lens, the effective radius DT31 of the object side surface of the third lens, the effective radius DT32 of the image side surface of the third lens, and the effective radius DT62 of the image side surface of the sixth lens satisfy: 0.8< (DT11-DT31)/(DT62-DT32) < 1.1.
Further, the effective radius DT32 of the image side surface of the third lens and the effective radius DT62 of the image side surface of the sixth lens satisfy: 0.2< DT32/DT62< 0.4.
By applying the technical scheme of the utility model, the imaging mirrorThe lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side in sequence; the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the sixth lens has positive focal power; distortion DIST of imaging lens set at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the maximum half field angle Semi-FOV of the imaging lens group, half ImgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface meet the following requirements: 0.8<ImgH*tan(Semi-FOV)/TTL<1。
The object side of the first lens is a concave surface, and the image side surface of the first lens is a concave surface, so that the first lens bears the light convergence effect, and the second lens is matched with the first lens, so that the focal length can be maximally improved on the premise that the light has good convergence. Meanwhile, a third lens with a convex object side surface and a convex image side surface and a sixth lens with positive focal power are carried, so that aberration can be effectively reduced. Distortion DIST at 0.9 field of view by constraining imaging lens set0.9FThe characteristic of small distortion of the imaging lens group is favorably ensured, and the system illumination is favorably improved. By constraining the maximum half field angle Semi-FOV of the imaging lens group, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the on-axis distance TTL from the shot object detection surface of the first lens to the imaging surface to be within a reasonable range, the imaging lens group has smaller TTL under the characteristic of keeping the wide angle of the imaging lens group, and the application range of the imaging lens group is widened.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic view of an imaging lens assembly according to a first embodiment of the present invention;
fig. 2 to 5 respectively show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the imaging lens set in fig. 1;
FIG. 6 is a schematic view of an imaging lens assembly according to example two of the present invention;
figures 7 to 10 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve, respectively, of the imaging lens assembly of figure 6;
FIG. 11 is a schematic structural view of a third imaging lens set according to an example of the present invention;
fig. 12 to 15 respectively show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the imaging lens set in fig. 11;
FIG. 16 is a schematic view of an imaging lens assembly of example four of the present invention;
FIGS. 17 to 20 show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve and a distortion curve of the imaging lens assembly of FIG. 16;
FIG. 21 is a schematic view of an imaging lens assembly of example five of the present invention;
fig. 22 to 25 show an axial chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens group of fig. 21, respectively.
Wherein the figures include the following reference numerals:
STO, stop; e1, a first lens; s1, the object side of the first lens; s2, the image side surface of the first lens; e2, a second lens; s3, the object side of the second lens; s4, the image side surface of the second lens; e3, third lens; s5, the object side of the third lens; s6, the image side surface of the third lens; e4, fourth lens; s7, the object side of the fourth lens; s8, the image side surface of the fourth lens; e5, fifth lens; s9, the object side of the fifth lens; s10, the image side surface of the fifth lens; e6, sixth lens; s11, the object side of the sixth lens; s12, the image side surface of the sixth lens; e7, optical filters; s13, the object detection surface of the optical filter; s14, the image side surface of the optical filter; and S15, imaging surface.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the utility model.
It should be noted that in this specification the expressions first, second, third etc. are only used 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 lenses have been slightly exaggerated for the convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be made by determining whether or not the surface shape is concave or convex using an R value (R denotes a radius of curvature of the paraxial region, and usually denotes an R value in a lens database (lens data) in optical software) according to a determination method by a person ordinarily skilled in the art. When the R value is positive, the surface is judged to be convex, and when the R value is negative, the surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.
The utility model mainly aims to provide an imaging lens group to solve the problem that the wide angle and high image quality of the imaging lens group in the prior art are difficult to realize simultaneously.
Example one
As shown in fig. 1 to 25, the imaging lens assembly includes, in order from a subject side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the sixth lens has positive focal power; distortion DIST of imaging lens set at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the maximum half field angle Semi-FOV of the imaging lens group, half ImgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface meet the following requirements: 0.8<ImgH*tan(Semi-FOV)/TTL<1。
The object side of the first lens is a concave surface, and the image side surface of the first lens is a concave surface, so that the first lens bears the light convergence effect, and the second lens is matched with the first lens, so that the focal length can be maximally improved on the premise that the light has good convergence. Meanwhile, a third lens with a convex object side surface and a convex image side surface and a sixth lens with positive focal power are carried, so that aberration can be effectively reduced. Distortion DIST at 0.9 field of view by constraining imaging lens set0.9FThe characteristic of small distortion of the imaging lens group is favorably ensured, and the system illumination is favorably improved. By restricting the maximum half field angle Semi-FOV of the imaging lens group, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the distance from the object detection surface of the first lens to the imaging surfaceThe relation between the axial distance TTL is in a reasonable range, and the imaging lens group has smaller TTL under the characteristic of keeping the wide angle of the imaging lens group, so that the application range of the imaging lens group is widened.
In this embodiment, an on-axis distance SD from the stop to the image side surface of the sixth lens and an on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens satisfy: 0.5< SD/TD < 0.65. The ratio between the axial distance SD of the image side surface of the constraint diaphragm to the sixth lens and the axial distance TD of the shot object side surface of the first lens to the image side surface of the sixth lens is in a reasonable range, so that the imaging effect of the imaging lens group can be improved, the imaging lens group has a wider shooting angle, and the optical performance of the imaging lens group is improved. Preferably 0.5< SD/TD < 0.6.
In this embodiment, an on-axis distance BFL from the image-side surface to the imaging surface of the sixth lens element and the effective focal length f of the imaging lens group satisfy: 0.55< BFL/f < 0.65. Satisfying this conditional expression, being favorable to obtaining great optics back burnt to make the imaging lens group possess telecentric effect, also be favorable to reducing the sensitivity of imaging lens group simultaneously, and shorten imaging lens group overall length, realize the miniaturization.
In the present embodiment, the maximum half field angle Semi-FOV of the imaging lens group, the on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and the entrance pupil diameter EPD of the imaging lens group satisfy: 0.2< EPD tan (Semi-FOV)/TD < 0.35. The condition is satisfied, the light inlet quantity of the imaging lens group can be effectively increased, and meanwhile, the imaging lens group keeps a smaller TD, so that the imaging lens group has higher optical performance and better processing technology.
In the present embodiment, the focal length f1 of the first lens, the focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy the following conditions: 1< (f1-f2)/f12< 1.5. The condition is satisfied, and the imaging quality of the imaging lens group is improved and the sensitivity of the system is reduced. Preferably, 1.1< (f1-f2)/f12< 1.5.
In the embodiment, the effective focal length f of the imaging lens group and the combined focal length f2 of the second lens and the third lens satisfy: 0.9< f23/f < 1.1. Satisfying this conditional expression, being favorable to distributing the focal power of formation of image lens group more on two lenses in back, can promoting system aberration correction ability well, can also reduce the size of formation of image lens group simultaneously effectively.
In the present embodiment, the focal length f2 of the second lens, 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 satisfy: 0.7< (R3+ R4)/f2< 0.8. Satisfying this conditional expression, first make the formation of image lens group possess better colour difference correction ability, the second has reduced the sensitivity of formation of image lens group and can avoid effectively because the second lens manufacturability is too poor a series of processing problems that bring, the third is favorable to the formation of image lens group to keep its ultra-thin characteristic.
In the present embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9< (R5-R6)/(R3+ R4) < 1.2. The condition formula is satisfied, which is helpful to compress TTL, increase the field angle of the imaging lens group, improve the angular magnification, and present clearer shooting details.
In the present embodiment, the maximum central thickness CT of the first to sixth lensesMAXThe maximum air interval AT on the optical axis between the adjacent two lenses of the first lens to the sixth lensMAXSatisfies the following conditions: 0.8<ATMAX/CTMAX<1. The condition is satisfied, which is beneficial to the miniaturization of the imaging lens group, reduces the ghost image risk and can effectively reduce the chromatic aberration.
In the present embodiment, a sum Σ AT of air spaces on the optical axis between adjacent two lenses of the first to sixth lenses and an on-axis distance BFL from the image-side surface of the sixth lens to the imaging surface satisfy: 0.7< BFL/SIGMA AT < 0.8. The condition is satisfied, the ultra-thin characteristic of imaging lens group is facilitated to be realized, and the actual processing difficulty caused by too short back focal length of the imaging lens group can be avoided.
In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.7< CT1/CT6< 0.9. The imaging lens group can better balance the chromatic aberration of the system by meeting the conditional expression, and meanwhile, the problem that the processing technology is difficult due to the fact that the sixth lens is too thin is solved.
In this embodiment, the pitch T12 of the first and second lenses, the pitch T23 of the second and third lenses, and the pitch T34 of the third and fourth lenses satisfy: 0.9< (T23+ T34)/T12< 1. Satisfying this conditional expression, not only making the balanced system colour difference that the formation of image lens group can be better, controlling the distortion volume of formation of image lens group effectively, can effectively reducing the ghost image risk between third lens and the fourth lens moreover, making the formation of image lens group possess more outstanding imaging quality.
In the present embodiment, the edge thickness ET3 of the third lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.4< ET3/CT3< 0.6. Satisfying this conditional expression makes it possible to balance the amount of distortion influence of the system while reducing the system size and maintaining good workability.
In the present embodiment, the edge thickness ET1 of the first lens on the optical axis, the edge thickness ET2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 0.9< (ET1+ ET2)/(CT1+ CT2) < 1.1. When the conditional expression is satisfied, the imaging lens group can better balance the chromatic aberration of the system, and the distortion quantity of the imaging lens group is effectively controlled; secondly, the problems of difficult processing and poor system sensitivity caused by over-thin first lens can be effectively avoided.
In this embodiment, an on-axis distance SAG32 between an intersection point of the image-side surface of the third lens and the optical axis and an effective radius vertex of the image-side surface of the third lens and an on-axis distance SAG41 between an intersection point of the object-side surface of the fourth lens and the optical axis and an effective radius vertex of the object-side surface of the fourth lens satisfy: 0.8< SAG32/SAG41< 1.1. The condition is satisfied, so that the effective focal length is improved on the premise of keeping the imaging quality of the imaging lens group; secondly, the spherical aberration of the middle field and the coma of the edge field are improved, so that the system has better aberration correction capability; the third helps increasing the relative illuminance of formation of image lens group, promotes the formation of image quality of formation of image lens group under darker environment.
In the present embodiment, the effective radius DT11 of the object side surface of the first lens, the effective radius DT31 of the object side surface of the third lens, the effective radius DT32 of the image side surface of the third lens, and the effective radius DT62 of the image side surface of the sixth lens satisfy: 0.8< (DT11-DT31)/(DT62-DT32) < 1.1. The condition is satisfied, the excessive lens light emergent angle can be effectively inhibited, the main light angle of the imaging lens group is adjusted, the relative brightness of the imaging lens group can be effectively improved, and the image plane definition is improved.
In the present embodiment, the effective radius DT32 of the image-side surface of the third lens and the effective radius DT62 of the image-side surface of the sixth lens satisfy: 0.2< DT32/DT62< 0.4. Satisfying this conditional expression, can increasing the light flux of formation of image lens group effectively, can promote the relative illuminance of system especially marginal visual field for the system still has good imaging quality under the darker environment of light.
Example two
As shown in fig. 1 to 25, the imaging lens assembly includes, in order from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the maximum half field angle Semi-FOV of the imaging lens group, half ImgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface meet the following requirements: 0.8< ImgH tan (Semi-FOV)/TTL < 1; the edge thickness ET1 of the first lens on the optical axis, the edge thickness ET2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy the following conditions: 0.9< (ET1+ ET2)/(CT1+ CT2) < 1.1.
The object side of the first lens is a concave surface, and the image side surface of the first lens is a concave surface, so that the first lens bears the light convergence effect, and the second lens is matched with the first lens, so that the focal length can be maximally improved on the premise that the light has good convergence. Meanwhile, a third lens with a convex object side surface and a convex image side surface and a sixth lens with positive focal power are carried, so that aberration can be effectively reduced. The imaging lens group has smaller TTL under the characteristic of keeping the wide angle of the imaging lens group by constraining the relational expression between the maximum half field angle Semi-FOV of the imaging lens group, half of the diagonal length ImgH of the effective pixel area on the imaging surface and the on-axis distance TTL from the object measuring surface of the first lens to the imaging surface to be in a reasonable range, and the use range of the imaging lens group is widened. By constraining the relation among the edge thickness ET1 of the first lens on the optical axis, the edge thickness ET2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis, the first imaging lens group can better balance the chromatic aberration of the system and effectively control the distortion of the imaging lens group; secondly, the problems of difficult processing and poor system sensitivity caused by over-thin first lens can be effectively avoided.
In this embodiment, the sixth lens has positive optical power; distortion DIST of imaging lens set at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent. Distortion DIST at 0.9 field of view by constraining imaging lens set0.9FThe characteristic of small distortion of the imaging lens group is favorably ensured, and the system illumination is favorably improved.
In this embodiment, an on-axis distance SD from the stop to the image side surface of the sixth lens and an on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens satisfy: 0.5< SD/TD < 0.65. The ratio between the axial distance SD of the image side surface of the constraint diaphragm to the sixth lens and the axial distance TD of the shot object side surface of the first lens to the image side surface of the sixth lens is in a reasonable range, so that the imaging effect of the imaging lens group can be improved, the imaging lens group has a wider shooting angle, and the optical performance of the imaging lens group is improved. Preferably 0.5< SD/TD < 0.6.
In this embodiment, an on-axis distance BFL from the image-side surface to the imaging surface of the sixth lens element and the effective focal length f of the imaging lens group satisfy: 0.55< BFL/f < 0.65. Satisfying this conditional expression, being favorable to obtaining great optics back burnt to make the imaging lens group possess telecentric effect, also be favorable to reducing the sensitivity of imaging lens group simultaneously, and shorten imaging lens group overall length, realize the miniaturization.
In the present embodiment, the maximum half field angle Semi-FOV of the imaging lens group, the on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and the entrance pupil diameter EPD of the imaging lens group satisfy: 0.2< EPD tan (Semi-FOV)/TD < 0.35. The condition is satisfied, the light inlet quantity of the imaging lens group can be effectively increased, and meanwhile, the imaging lens group keeps a smaller TD, so that the imaging lens group has higher optical performance and better processing technology.
In the present embodiment, the focal length f1 of the first lens, the focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy the following conditions: 1< (f1-f2)/f12< 1.5. The condition is satisfied, and the imaging quality of the imaging lens group is improved and the sensitivity of the system is reduced. Preferably, 1.1< (f1-f2)/f12< 1.5.
In the embodiment, the effective focal length f of the imaging lens group and the combined focal length f2 of the second lens and the third lens satisfy: 0.9< f23/f < 1.1. Satisfying this conditional expression, being favorable to distributing the focal power of formation of image lens group more on two lenses in back, can promoting system aberration correction ability well, can also reduce the size of formation of image lens group simultaneously effectively.
In the present embodiment, the focal length f2 of the second lens, 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 satisfy: 0.7< (R3+ R4)/f2< 0.8. Satisfying this conditional expression, first make the formation of image lens group possess better colour difference correction ability, the second has reduced the sensitivity of formation of image lens group and can avoid effectively because the second lens manufacturability is too poor a series of processing problems that bring, the third is favorable to the formation of image lens group to keep its ultra-thin characteristic.
In the present embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9< (R5-R6)/(R3+ R4) < 1.2. Satisfying the conditional expression can help to compress TTL, increase the field angle of the imaging lens group, improve the angular magnification and present clearer shot details.
In the present embodiment, the maximum central thickness CT of the first to sixth lensesMAXThe maximum air interval AT on the optical axis between the adjacent two lenses of the first lens to the sixth lensMAXSatisfies the following conditions: 0.8<ATMAX/CTMAX<1. The condition is satisfied, which is beneficial to the miniaturization of the imaging lens group, reduces the ghost image risk and can effectively reduce the chromatic aberration.
In the present embodiment, a sum Σ AT of air spaces on the optical axis between adjacent two lenses of the first to sixth lenses and an on-axis distance BFL from the image-side surface of the sixth lens to the imaging surface satisfy: 0.7< BFL/sigma AT < 0.8. The condition is satisfied, the ultra-thin characteristic of imaging lens group is facilitated to be realized, and the actual processing difficulty caused by too short back focal length of the imaging lens group can be avoided.
In the present embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.7< CT1/CT6< 0.9. The imaging lens group can better balance the chromatic aberration of the system by meeting the conditional expression, and meanwhile, the problem that the processing technology is difficult due to the fact that the sixth lens is too thin is solved.
In the present embodiment, the distance T12 between the first and second lenses, the distance T23 between the second and third lenses, and the distance T34 between the third and fourth lenses satisfy: 0.9< (T23+ T34)/T12< 1. Satisfying this conditional expression, not only making the balanced system colour difference that the formation of image lens group can be better, controlling the distortion volume of formation of image lens group effectively, can effectively reducing the ghost image risk between third lens and the fourth lens moreover, making the formation of image lens group possess more outstanding imaging quality.
In the present embodiment, the edge thickness ET3 of the third lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.4< ET3/CT3< 0.6. Satisfying this conditional expression makes it possible to balance the amount of distortion influence of the system while reducing the system size and maintaining good workability.
In this embodiment, an on-axis distance SAG32 between an intersection point of the image-side surface of the third lens and the optical axis and an effective radius vertex of the image-side surface of the third lens and an on-axis distance SAG41 between an intersection point of the object-side surface of the fourth lens and the optical axis and an effective radius vertex of the object-side surface of the fourth lens satisfy: 0.8< SAG32/SAG41< 1.1. The condition is satisfied, so that the effective focal length is improved on the premise of keeping the imaging quality of the imaging lens group; secondly, the spherical aberration of the middle field of view and the coma of the edge field of view are improved, so that the system has better aberration correction capability; the third helps increasing the relative illuminance of formation of image lens group, promotes the formation of image quality of formation of image lens group under darker environment.
In the present embodiment, the effective radius DT11 of the object side surface of the first lens, the effective radius DT31 of the object side surface of the third lens, the effective radius DT32 of the image side surface of the third lens, and the effective radius DT62 of the image side surface of the sixth lens satisfy: 0.8< (DT11-DT31)/(DT62-DT32) < 1.1. The condition is satisfied, the excessive lens light emergent angle can be effectively inhibited, the main light angle of the imaging lens group is adjusted, the relative brightness of the imaging lens group can be effectively improved, and the image plane definition is improved.
In the present embodiment, the effective radius DT32 of the image-side surface of the third lens and the effective radius DT62 of the image-side surface of the sixth lens satisfy: 0.2< DT32/DT62< 0.4. Satisfying this conditional expression, can increasing the light flux of formation of image lens group effectively, can promote the relative illuminance of system especially marginal visual field for the system still has good imaging quality under the darker environment of light.
Optionally, the imaging lens group may further include a filter for correcting color deviation or a protective glass for protecting the photosensitive element on the imaging surface.
The imaging lens assembly in the present application may employ a plurality of lenses, such as the six lenses described above. The aperture of the imaging lens group can be effectively increased, the sensitivity of the lens is reduced, and the machinability of the lens is improved by reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, so that the imaging lens group is more beneficial to production and processing and is applicable to portable electronic equipment such as smart phones. The imaging lens group also has the advantages of ultra-thinness and good imaging quality, and can meet the miniaturization requirement of intelligent electronic products.
In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens has the characteristics 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 lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens set can be varied to achieve the various results and advantages described herein without departing from the claimed technology. For example, although six lenses are exemplified in the embodiment, the imaging lens group is not limited to include six lenses. The imaging lens assembly can also include other numbers of lenses, if desired.
Examples of specific surface types and parameters of the imaging lens group applicable to the above embodiments are further described below with reference to the drawings.
It should be noted that any one of the following examples one to five is applicable to all embodiments of the present application.
Example one
As shown in fig. 1 to 5, an imaging lens set according to a first example of the present application is described. Fig. 1 is a schematic diagram illustrating the structure of an imaging lens set of the first example.
As shown in fig. 1, the imaging lens assembly includes, in order from a subject side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an image plane S15.
The first lens E1 has negative power, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has positive focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has positive power, and the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The fourth lens E4 has negative power, and the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The fifth lens E5 has positive power, and the object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has positive refractive power, and the object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
In this example, the total effective focal length f of the imaging lens assembly is 2.16mm, the maximum half field of view Semi-FOV of the imaging lens assembly is 58.38 °, the total length TTL of the imaging lens assembly is 6.21mm and the image height ImgH is 3.42 mm.
Table 1 shows a table of basic structural parameters for the imaging lens set of example one, wherein the radius of curvature, thickness/distance, and effective radius are all in millimeters (mm).
TABLE 1
In the first example, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspheric surfaces, and the surface shape of each aspheric surface lens can be defined by, but is not limited to, the following aspheric surface formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S12 in example one.
TABLE 2
Fig. 2 shows an axial chromatic aberration curve of the imaging lens assembly of example one, which shows the deviation of the converging focuses of light rays with different wavelengths through the imaging lens assembly. Fig. 3 shows a chromatic aberration of magnification curve of the imaging lens assembly of the first example, which represents the deviation of different image heights of light passing through the imaging lens assembly on the image plane. FIG. 4 shows an astigmatism curve representing meridional and sagittal field curvatures for the imaging lens assembly of example one. Fig. 5 shows distortion curves of the imaging lens assembly of example one, which show values of distortion magnitudes for different angles of view.
As can be seen from fig. 2 to 5, the imaging lens assembly of the first example can achieve good imaging quality.
Example two
As shown in FIG. 6 to FIG. 10, an imaging lens assembly of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 6 is a schematic diagram of the imaging lens group of the second example.
As shown in fig. 6, the imaging lens assembly includes, in order from a subject side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an image plane S15.
The first lens E1 has negative power, and the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has positive focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has positive power, and the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The fourth lens E4 has positive power, and the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The fifth lens E5 has negative power, and the object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has positive refractive power, and the object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
In this example, the total effective focal length f of the imaging lens group is 2.06mm, the maximum half field angle Semi-FOV of the imaging lens group is 58.51 ° the total length TTL of the imaging lens group is 5.96mm and the image height ImgH is 3.35 mm.
Table 3 shows a table of basic structural parameters for the imaging lens set of example two, wherein the radius of curvature, thickness/distance and effective radius are all in millimeters (mm).
TABLE 3
Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.5255E-01 | -2.3473E-01 | 2.0739E-01 | -1.5187E-01 | 8.7288E-02 | -3.8451E-02 | 1.2846E-02 |
| S2 | 2.6500E-01 | -2.0336E-01 | 7.6391E-02 | 1.7321E-01 | -4.5712E-01 | 5.5702E-01 | -4.0847E-01 |
| S3 | -6.7280E-02 | -1.0501E-01 | -3.8744E-01 | 3.9887E+00 | -1.9728E+01 | 6.0598E+01 | -1.2473E+02 |
| S4 | -1.4620E-03 | -1.7097E+00 | 3.3333E+01 | -4.3399E+02 | 3.8607E+03 | -2.4320E+04 | 1.1101E+05 |
| S5 | -1.1151E-02 | 1.1485E+00 | -2.9522E+01 | 4.6182E+02 | -4.7233E+03 | 3.3116E+04 | -1.6389E+05 |
| S6 | -2.6874E-01 | 1.9222E-01 | 2.3963E+00 | -8.9791E+01 | 1.1837E+03 | -8.9797E+03 | 4.4393E+04 |
| S7 | -7.2391E-01 | 8.7998E+00 | -1.4884E+02 | 1.5585E+03 | -1.1284E+04 | 5.8403E+04 | -2.1932E+05 |
| S8 | -4.4244E-01 | 6.0678E+00 | -4.8979E+01 | 2.4346E+02 | -8.4003E+02 | 2.0834E+03 | -3.7240E+03 |
| S9 | -6.8831E-01 | 7.3762E+00 | -3.9557E+01 | 1.4306E+02 | -3.7807E+02 | 7.5082E+02 | -1.1271E+03 |
| S10 | -1.1855E+00 | 4.9826E+00 | -1.8123E+01 | 5.5859E+01 | -1.3750E+02 | 2.6190E+02 | -3.7924E+02 |
| S11 | -8.0967E-01 | 1.6582E+00 | -3.0770E+00 | 4.6155E+00 | -5.4328E+00 | 5.0183E+00 | -3.6234E+00 |
| S12 | -5.5521E-01 | 6.4717E-01 | -6.6492E-01 | 5.2661E-01 | -3.0974E-01 | 1.3408E-01 | -4.2572E-02 |
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -3.2286E-03 | 6.0351E-04 | -8.2365E-05 | 7.9543E-06 | -5.1449E-07 | 2.0005E-08 | -3.5419E-10 |
| S2 | 1.8446E-01 | -4.7422E-02 | 4.0969E-03 | 1.3204E-03 | -4.7889E-04 | 6.3130E-05 | -3.2098E-06 |
| S3 | 1.7855E+02 | -1.8030E+02 | 1.2805E+02 | -6.2590E+01 | 2.0033E+01 | -3.7757E+00 | 3.1716E-01 |
| S4 | -3.7068E+05 | 9.0411E+05 | -1.5896E+06 | 1.9579E+06 | -1.6006E+06 | 7.7905E+05 | -1.7068E+05 |
| S5 | 5.8160E+05 | -1.4865E+06 | 2.7142E+06 | -3.4560E+06 | 2.9175E+06 | -1.4686E+06 | 3.3395E+05 |
| S6 | -1.5058E+05 | 3.5773E+05 | -5.9549E+05 | 6.8113E+05 | -5.1031E+05 | 2.2565E+05 | -4.4669E+04 |
| S7 | 6.0133E+05 | -1.2008E+06 | 1.7238E+06 | -1.7301E+06 | 1.1506E+06 | -4.5486E+05 | 8.0818E+04 |
| S8 | 4.7323E+03 | -4.1344E+03 | 2.2970E+03 | -6.3351E+02 | -4.8996E+01 | 8.5383E+01 | -1.7366E+01 |
| S9 | 1.2736E+03 | -1.0716E+03 | 6.5913E+02 | -2.8726E+02 | 8.3918E+01 | -1.4729E+01 | 1.1735E+00 |
| S10 | 4.1292E+02 | -3.3432E+02 | 1.9769E+02 | -8.2740E+01 | 2.3167E+01 | -3.8854E+00 | 2.9464E-01 |
| S11 | 2.0274E+00 | -8.6734E-01 | 2.7766E-01 | -6.4176E-02 | 1.0077E-02 | -9.5806E-04 | 4.1478E-05 |
| S12 | 9.8537E-03 | -1.6394E-03 | 1.9072E-04 | -1.4731E-05 | 6.8109E-07 | -1.4562E-08 | 2.2717E-11 |
TABLE 4
Fig. 7 shows on-axis chromatic aberration curves of the imaging lens group of example two, which indicate the deviation of the converging focuses of light rays with different wavelengths after passing through the imaging lens group. Fig. 8 shows a chromatic aberration of magnification curve of the imaging lens assembly of the second example, which shows the deviation of different image heights of the light passing through the imaging lens assembly. FIG. 9 is an astigmatism curve representing meridional and sagittal field curvatures for the imaging lens assembly of example two. Fig. 10 shows distortion curves for the imaging lens set of example two, which show distortion magnitude values for different field angles.
As can be seen from fig. 7 to 10, the imaging lens assembly of example two can achieve good imaging quality.
EXAMPLE III
As shown in fig. 11 to 15, an imaging lens set of the third example of the present application is described. Fig. 11 is a schematic diagram showing the structure of the imaging lens group of example three.
As shown in fig. 11, the imaging lens assembly includes, in order from a subject side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an image plane S15.
The first lens E1 has negative power, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has positive focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has positive power, and the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The fourth lens E4 has negative power, and the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The fifth lens E5 has positive power, and the object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The sixth lens E6 has positive refractive power, and the object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
In this example, the total effective focal length f of the imaging lens assembly is 2.10mm, the maximum half field of view Semi-FOV of the imaging lens assembly is 58.92 °, the total length TTL of the imaging lens assembly is 6.26mm and the image height ImgH is 3.42 mm.
Table 5 shows a table of basic structural parameters for the imaging lens set of example three, wherein the radius of curvature, thickness/distance and effective radius are all in millimeters (mm).
TABLE 5
Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.3527E-01 | -2.1806E-01 | 2.1249E-01 | -1.7427E-01 | 1.1041E-01 | -5.2199E-02 | 1.8200E-02 |
| S2 | 3.0468E-01 | -4.5623E-01 | 1.3272E+00 | -3.4872E+00 | 6.5408E+00 | -8.6716E+00 | 8.2115E+00 |
| S3 | 1.4971E-02 | -1.1384E-01 | -1.0126E+00 | 1.0147E+01 | -5.6541E+01 | 2.0627E+02 | -5.2099E+02 |
| S4 | 5.6039E-02 | -1.7588E+00 | 3.6900E+01 | -5.2422E+02 | 4.9896E+03 | -3.2910E+04 | 1.5423E+05 |
| S5 | -3.8360E-02 | 2.9350E+00 | -9.2892E+01 | 1.7988E+03 | -2.2941E+04 | 2.0146E+05 | -1.2520E+06 |
| S6 | -1.9421E-01 | -4.2699E-01 | 1.9096E+01 | -3.1221E+02 | 3.1615E+03 | -2.1637E+04 | 1.0391E+05 |
| S7 | -8.1894E-01 | 5.8903E+00 | -7.2661E+01 | 6.5837E+02 | -4.2723E+03 | 2.0186E+04 | -7.0220E+04 |
| S8 | -1.1739E+00 | 7.9450E+00 | -5.0520E+01 | 2.3865E+02 | -8.2350E+02 | 2.0920E+03 | -3.9405E+03 |
| S9 | -9.4748E-01 | 6.6502E+00 | -3.3231E+01 | 1.2492E+02 | -3.5516E+02 | 7.6365E+02 | -1.2417E+03 |
| S10 | -1.0498E+00 | 3.5762E+00 | -9.7408E+00 | 2.3017E+01 | -4.4921E+01 | 6.9874E+01 | -8.4361E+01 |
| S11 | -4.5760E-01 | 7.3889E-01 | -8.6400E-01 | 6.9040E-01 | -3.1570E-01 | 6.8309E-03 | 9.9088E-02 |
| S12 | -4.5244E-01 | 4.2343E-01 | -3.1092E-01 | 1.4876E-01 | -3.2643E-02 | -8.9586E-03 | 1.0197E-02 |
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -4.6419E-03 | 8.5402E-04 | -1.1027E-04 | 9.4808E-06 | -4.8744E-07 | 1.1341E-08 | 0.0000E+00 |
| S2 | -5.5718E+00 | 2.6798E+00 | -8.8861E-01 | 1.9260E-01 | -2.4506E-02 | 1.3862E-03 | 0.0000E+00 |
| S3 | 9.3591E+02 | -1.2066E+03 | 1.1098E+03 | -7.1131E+02 | 3.0189E+02 | -7.6238E+01 | 8.6687E+00 |
| S4 | -5.2038E+05 | 1.2669E+06 | -2.2034E+06 | 2.6678E+06 | -2.1343E+06 | 1.0135E+06 | -2.1618E+05 |
| S5 | 5.5863E+06 | -1.7948E+07 | 4.1136E+07 | -6.5563E+07 | 6.8997E+07 | -4.3078E+07 | 1.2078E+07 |
| S6 | -3.5653E+05 | 8.7807E+05 | -1.5392E+06 | 1.8734E+06 | -1.5038E+06 | 7.1556E+05 | -1.5281E+05 |
| S7 | 1.8059E+05 | -3.4200E+05 | 4.7019E+05 | -4.5588E+05 | 2.9518E+05 | -1.1446E+05 | 2.0087E+04 |
| S8 | 5.5153E+03 | -5.7070E+03 | 4.3015E+03 | -2.2932E+03 | 8.1869E+02 | -1.7548E+02 | 1.7066E+01 |
| S9 | 1.5217E+03 | -1.3926E+03 | 9.3480E+02 | -4.4588E+02 | 1.4283E+02 | -2.7514E+01 | 2.4060E+00 |
| S10 | 7.7198E+01 | -5.2395E+01 | 2.5757E+01 | -8.8707E+00 | 2.0241E+00 | -2.7442E-01 | 1.6719E-02 |
| S11 | -7.4405E-02 | 3.0346E-02 | -7.9037E-03 | 1.3484E-03 | -1.4629E-04 | 9.1774E-06 | -2.5385E-07 |
| S12 | -4.1466E-03 | 1.0233E-03 | -1.6698E-04 | 1.8169E-05 | -1.2713E-06 | 5.1828E-08 | -9.3635E-10 |
TABLE 6
Fig. 12 shows the on-axis aberration curves of the imaging lens group of example three, which show the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. Fig. 13 shows a chromatic aberration of magnification curve of the imaging lens assembly of example three, which represents the deviation of different image heights of light passing through the imaging lens assembly on the image plane. FIG. 14 shows the astigmatism curves for the imaging lens group of example three, representing meridional and sagittal curvature of field. Fig. 15 shows distortion curves of the imaging lens group of example three, which show values of distortion magnitudes for different angles of view.
As can be seen from fig. 12 to 15, the imaging lens assembly of the third example can achieve good imaging quality.
Example four
As shown in fig. 16 to 20, an imaging lens set of the fourth example of the present application is described. Fig. 16 is a schematic diagram illustrating the structure of the imaging lens group of example four.
As shown in fig. 16, the imaging lens assembly includes, in order from a subject side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an image plane S15.
The first lens E1 has negative power, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has positive focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has positive power, and the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The fourth lens E4 has negative power, and the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The fifth lens E5 has positive power, and the object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has positive power, and the object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
In this example, the total effective focal length f of the imaging lens group is 2.07mm, the maximum half field angle Semi-FOV of the imaging lens group is 59.98 ° and the total length TTL of the imaging lens group is 6.18mm and the image height ImgH is 3.42 mm.
Table 7 shows a table of basic structural parameters for the imaging lens set of example four, wherein the radius of curvature, thickness/distance, and effective radius are all in millimeters (mm).
TABLE 7
Table 8 shows the high-order term coefficients that can be used for each aspherical mirror in example four, wherein each aspherical mirror type can be defined by formula (1) given in example one above.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.4985E-01 | -2.1820E-01 | 1.8217E-01 | -1.2432E-01 | 6.6313E-02 | -2.6976E-02 | 8.2663E-03 |
| S2 | 2.8784E-01 | -1.7552E-01 | 4.5667E-02 | -1.7293E-01 | 1.0482E+00 | -2.5460E+00 | 3.5391E+00 |
| S3 | 9.1249E-03 | 3.3380E-02 | -3.4018E+00 | 3.1259E+01 | -1.7257E+02 | 6.3301E+02 | -1.6137E+03 |
| S4 | 7.9824E-02 | -2.7114E+00 | 5.5912E+01 | -7.5587E+02 | 6.8741E+03 | -4.3589E+04 | 1.9748E+05 |
| S5 | -6.7903E-03 | 9.4208E-01 | -2.4099E+01 | 3.7193E+02 | -3.7174E+03 | 2.4865E+04 | -1.1243E+05 |
| S6 | -1.7319E-01 | -2.8027E-01 | 1.4019E+01 | -2.4283E+02 | 2.5351E+03 | -1.7547E+04 | 8.4221E+04 |
| S7 | -7.7568E-01 | 5.2187E+00 | -6.1643E+01 | 5.2826E+02 | -3.2309E+03 | 1.4380E+04 | -4.7159E+04 |
| S8 | -1.1503E+00 | 7.8391E+00 | -4.9506E+01 | 2.2960E+02 | -7.7214E+02 | 1.9013E+03 | -3.4574E+03 |
| S9 | -9.6800E-01 | 6.8608E+00 | -3.4307E+01 | 1.2777E+02 | -3.5700E+02 | 7.5045E+02 | -1.1917E+03 |
| S10 | -9.9319E-01 | 3.3178E+00 | -8.7428E+00 | 1.9191E+01 | -3.3570E+01 | 4.6359E+01 | -5.0453E+01 |
| S11 | -4.2426E-01 | 7.2660E-01 | -9.7323E-01 | 9.9871E-01 | -7.5923E-01 | 4.1652E-01 | -1.6181E-01 |
| S12 | -4.2738E-01 | 4.2266E-01 | -3.7284E-01 | 2.6583E-01 | -1.4903E-01 | 6.4772E-02 | -2.1613E-02 |
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.8901E-03 | 3.1830E-04 | -3.8527E-05 | 3.1913E-06 | -1.6285E-07 | 3.8727E-09 | 0.0000E+00 |
| S2 | -3.1586E+00 | 1.8705E+00 | -7.3106E-01 | 1.8124E-01 | -2.5835E-02 | 1.6136E-03 | 0.0000E+00 |
| S3 | 2.9239E+03 | -3.7928E+03 | 3.4996E+03 | -2.2438E+03 | 9.5045E+02 | -2.3922E+02 | 2.7095E+01 |
| S4 | -6.4741E+05 | 1.5389E+06 | -2.6257E+06 | 3.1330E+06 | -2.4812E+06 | 1.1713E+06 | -2.4940E+05 |
| S5 | 3.3815E+05 | -6.3282E+05 | 5.6474E+05 | 2.8165E+05 | -1.3157E+06 | 1.3297E+06 | -4.8286E+05 |
| S6 | -2.8673E+05 | 6.9746E+05 | -1.2038E+06 | 1.4392E+06 | -1.1330E+06 | 5.2798E+05 | -1.1031E+05 |
| S7 | 1.1458E+05 | -2.0566E+05 | 2.6908E+05 | -2.4933E+05 | 1.5490E+05 | -5.7830E+04 | 9.7994E+03 |
| S8 | 4.6602E+03 | -4.6399E+03 | 3.3668E+03 | -1.7307E+03 | 5.9722E+02 | -1.2409E+02 | 1.1738E+01 |
| S9 | 1.4309E+03 | -1.2909E+03 | 8.6074E+02 | -4.1103E+02 | 1.3279E+02 | -2.5966E+01 | 2.3180E+00 |
| S10 | 4.2672E+01 | -2.7340E+01 | 1.2831E+01 | -4.2212E+00 | 9.1188E-01 | -1.1495E-01 | 6.3296E-03 |
| S11 | 4.3445E-02 | -7.6834E-03 | 7.8690E-04 | -2.2424E-05 | -4.5730E-06 | 5.4680E-07 | -1.9333E-08 |
| S12 | 5.4773E-03 | -1.0385E-03 | 1.4405E-04 | -1.4118E-05 | 9.2244E-07 | -3.5943E-08 | 6.3037E-10 |
TABLE 8
Fig. 17 shows an on-axis aberration curve of the imaging lens group of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. Fig. 18 shows a chromatic aberration of magnification curve of the imaging lens group of example four, which shows the deviation of different image heights of the light passing through the imaging lens group on the imaging plane. Figure 19 shows the astigmatism curves for the imaging lens group of example four representing meridional and sagittal image planes curvature. Fig. 20 shows distortion curves of the imaging lens group of example four, which show values of distortion magnitudes for different angles of view.
As can be seen from fig. 17 to 20, the imaging lens assembly of example four can achieve good imaging quality.
Example five
As shown in fig. 21 to 25, an imaging lens assembly of example five of the present application is described. FIG. 21 is a schematic view of the imaging lens assembly of example five.
As shown in fig. 21, the imaging lens assembly includes, in order from a subject side to an image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an image plane S15.
The first lens E1 has negative power, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has positive focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The third lens E3 has positive power, and the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The fourth lens E4 has negative power, and the object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The fifth lens E5 has positive power, and the object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The sixth lens E6 has positive refractive power, and the object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 has the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
In this example, the total effective focal length f of the imaging lens group is 2.04mm, the maximum half field angle Semi-FOV of the imaging lens group is 60.23 ° and the total length TTL of the imaging lens group is 6.18mm and the image height ImgH is 3.42 mm.
Table 9 sets forth a table of basic structural parameters for the imaging lens set of example five wherein the radii of curvature, thickness/distance and effective radius are all in millimeters (mm).
TABLE 9
Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
Fig. 22 shows an on-axis aberration curve for the imaging lens group of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. Fig. 23 shows a chromatic aberration of magnification curve of the imaging lens group of example five, which shows the deviation of different image heights of light rays on the imaging plane after passing through the imaging lens group. FIG. 24 is an astigmatism curve representing meridional and sagittal field curvatures for the imaging lens assembly of example five. Fig. 25 shows distortion curves for the imaging lens set of example five, representing distortion magnitude values for different field angles.
As can be seen from fig. 22 to 25, the imaging lens assembly of example five can achieve good imaging quality.
To sum up, examples one to five respectively satisfy the relationships shown in table 11.
Table 11 table 12 shows the effective focal lengths f of the imaging lens sets of examples one to five, and the effective focal lengths f1 to f6 of the respective lenses.
| Parameters/examples | 1 | 2 | 3 | 4 | 5 |
| f(mm) | 2.16 | 2.06 | 2.10 | 2.07 | 2.04 |
| f1(mm) | -3.37 | -3.27 | -3.33 | -3.23 | -3.22 |
| f2(mm) | 6.55 | 6.06 | 6.68 | 6.84 | 6.86 |
| f3(mm) | 2.56 | 2.46 | 2.45 | 2.39 | 2.39 |
| f4(mm) | -3.31 | 737.96 | -3.27 | -3.32 | -3.39 |
| f5(mm) | 5.35 | -55.10 | 6.55 | 6.32 | 6.33 |
| f6(mm) | 6.30 | 33.32 | 5.17 | 5.49 | 5.49 |
| Semi-FOV(°) | 58.38 | 58.51 | 58.92 | 59.98 | 60.23 |
| TTL(mm) | 6.21 | 5.96 | 6.26 | 6.18 | 6.18 |
| ImgH(mm) | 3.42 | 3.35 | 3.42 | 3.42 | 3.42 |
| Fno | 2.26 | 2.40 | 2.26 | 2.35 | 2.42 |
| |DIST0.9F| | 1.00 | 0.12 | 0.87 | 0.85 | 0.79 |
TABLE 12
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 imaging lens set described above.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (33)
1. An imaging lens assembly, comprising, in order from a subject side to an image side:
a first lens;
a second lens;
a third lens;
a fourth lens;
a fifth lens;
a sixth lens;
the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the sixth lens has positive optical power; distortion DIST of the imaging lens group at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the maximum half field angle Semi-FOV of the imaging lens group, half imgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface meet the following requirements: 0.8<ImgH*tan(Semi-FOV)/TTL<1。
2. The imaging lens assembly of claim 1, wherein an on-axis distance SD from the stop to the image side surface of the sixth lens element and an on-axis distance TD from the object side surface of the first lens element to the image side surface of the sixth lens element satisfy: 0.5< SD/TD < 0.65.
3. The imaging lens group of claim 1, wherein an on-axis distance BFL from an image side surface to an imaging surface of the sixth lens element and an effective focal length f of the imaging lens group satisfy: 0.55< BFL/f < 0.65.
4. The imaging lens group of claim 1, wherein a maximum half field angle Semi-FOV of the imaging lens group, an on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and an entrance pupil diameter EPD of the imaging lens group satisfy: 0.2< EPD tan (Semi-FOV)/TD < 0.35.
5. The imaging lens set of claim 1, wherein the focal length f1 of the first lens, the focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: 1< (f1-f2)/f12< 1.5.
6. The set of imaging lenses of claim 1, wherein an effective focal length f of the set of imaging lenses and a combined focal length f2 of the second and third lenses satisfy: 0.9< f23/f < 1.1.
7. The set of imaging lenses of claim 1, wherein the focal length f2 of the second lens, 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 satisfy: 0.7< (R3+ R4)/f2< 0.8.
8. The set of imaging lenses of claim 1, wherein the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9< (R5-R6)/(R3+ R4) < 1.2.
9. The imaging lens assembly of claim 1, wherein the largest of the first through sixth lenses isCardiac thickness CTMAXA maximum air space AT on the optical axis between two adjacent lenses of the first lens to the sixth lensMAXSatisfies the following conditions: 0.8<ATMAX/CTMAX<1。
10. The imaging lens group of claim 1, wherein a sum Σ AT of air spaces on the optical axis between adjacent two of said first to sixth lenses and an on-axis distance BFL from an image-side surface to an imaging surface of said sixth lens satisfy: 0.7< BFL/SIGMA AT < 0.8.
11. The imaging lens set of claim 1, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT6 of the sixth lens on the optical axis satisfy: 0.7< CT1/CT6< 0.9.
12. The set of imaging lenses of claim 1, wherein a pitch T12 of the first and second lenses, a pitch T23 of the second and third lenses, and a pitch T34 of the third and fourth lenses satisfy: 0.9< (T23+ T34)/T12< 1.
13. The imaging lens group of claim 1, wherein an edge thickness ET3 of the third lens plate on the optical axis and a center thickness CT3 of the third lens plate on the optical axis satisfy: 0.4< ET3/CT3< 0.6.
14. The imaging lens group of claim 1, wherein an edge thickness ET1 of the first lens piece on the optical axis, an edge thickness ET2 of the second lens piece on the optical axis, a center thickness CT1 of the first lens piece on the optical axis, and a center thickness CT2 of the second lens piece on the optical axis satisfy: 0.9< (ET1+ ET2)/(CT1+ CT2) < 1.1.
15. The imaging lens group of claim 1, wherein an on-axis distance SAG32 between an intersection of an image side surface of the third lens and an optical axis to an effective radius vertex of the image side surface of the third lens and an on-axis distance SAG41 between an intersection of an object side surface of the fourth lens and the optical axis to an effective radius vertex of an object side surface of the fourth lens satisfy: 0.8< SAG32/SAG41< 1.1.
16. The imaging lens group of claim 1, wherein an effective radius DT11 of the object side surface of the first lens element, an effective radius DT31 of the object side surface of the third lens element, an effective radius DT32 of the image side surface of the third lens element and an effective radius DT62 of the image side surface of the sixth lens element satisfy: 0.8< (DT11-DT31)/(DT62-DT32) < 1.1.
17. The imaging lens group of claim 1, wherein an effective radius DT32 of the image side surface of the third lens element and an effective radius DT62 of the image side surface of the sixth lens element satisfy: 0.2< DT32/DT62< 0.4.
18. An imaging lens assembly, comprising, in order from a subject side to an image side:
a first lens;
a second lens;
a third lens;
a fourth lens;
a fifth lens;
a sixth lens;
the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the maximum half field angle Semi-FOV of the imaging lens group, half imgH of the diagonal length of the effective pixel area on the imaging surface and the on-axis distance TTL from the object detection surface of the first lens to the imaging surface meet the following requirements: 0.8< ImgH tan (Semi-FOV)/TTL < 1; the edge thickness ET1 of the first lens on the optical axis, the edge thickness ET2 of the second lens on the optical axis, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 0.9< (ET1+ ET2)/(CT1+ CT2) < 1.1.
19. The imaging lens assembly of claim 18, wherein the sixth lens element has a positive optical power; distortion DIST of the imaging lens group at 0.9 visual field0.9FSatisfies the following conditions: | DIST0.9F|<2 percent; the on-axis distance SD from the diaphragm to the image side surface of the sixth lens and the on-axis distance TD from the shot object side surface of the first lens to the image side surface of the sixth lens meet the following conditions: 0.5<SD/TD<0.65。
20. The imaging lens group of claim 18, wherein an on-axis distance BFL from an image side surface to an imaging surface of said sixth lens element and an effective focal length f of said imaging lens group satisfy: 0.55< BFL/f < 0.65.
21. The imaging lens group of claim 18, wherein a maximum half field angle Semi-FOV of the imaging lens group, an on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and an entrance pupil diameter EPD of the imaging lens group satisfy: 0.2< EPD tan (Semi-FOV)/TD < 0.35.
22. The set of imaging lenses of claim 18, wherein the focal length f1 of the first lens, the focal length f2 of the second lens, and the combined focal length f12 of the first and second lenses satisfy: 1< (f1-f2)/f12< 1.5.
23. The set of imaging lenses of claim 18, wherein an effective focal length f of the set of imaging lenses and a combined focal length f2 of the second and third lenses satisfy: 0.9< f23/f < 1.1.
24. The set of imaging lenses of claim 18, wherein the focal length f2 of the second lens, 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 satisfy: 0.7< (R3+ R4)/f2< 0.8.
25. The set of imaging lenses of claim 18, wherein the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9< (R5-R6)/(R3+ R4) < 1.2.
26. The imaging lens set of claim 18, in which a maximum center thickness CT in the first through sixth lensesMAXA maximum air space AT on the optical axis between two adjacent lenses of the first lens to the sixth lensMAXSatisfies the following conditions: 0.8<ATMAX/CTMAX<1。
27. The imaging lens group of claim 18, wherein a sum Σ AT of air spaces on the optical axis between adjacent two of said first through sixth lenses and an axial distance BFL from an image side to an imaging surface of said sixth lens satisfy: 0.7< BFL/SIGMA AT < 0.8.
28. The set of imaging lenses of claim 18, wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0.7< CT1/CT6< 0.9.
29. The set of imaging lenses of claim 18, wherein a pitch T12 of the first and second lenses, a pitch T23 of the second and third lenses, and a pitch T34 of the third and fourth lenses satisfy: 0.9< (T23+ T34)/T12< 1.
30. The imaging lens group of claim 18, wherein the edge thickness ET3 of the third lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 0.4< ET3/CT3< 0.6.
31. The set of imaging lenses of claim 18, wherein an on-axis distance SAG32 from an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens and an on-axis distance SAG41 from an intersection of the object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens satisfy: 0.8< SAG32/SAG41< 1.1.
32. The set of imaging lenses of claim 18, wherein an effective radius DT11 of the object side surface of the first lens element, an effective radius DT31 of the object side surface of the third lens element, an effective radius DT32 of the image side surface of the third lens element and an effective radius DT62 of the image side surface of the sixth lens element are satisfied: 0.8< (DT11-DT31)/(DT62-DT32) < 1.1.
33. The set of imaging lenses of claim 18, wherein an effective radius DT32 of the image side surface of the third lens and an effective radius DT62 of the image side surface of the sixth lens satisfy: 0.2< DT32/DT62< 0.4.
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