CN217181321U

CN217181321U - Optical lens group

Info

Publication number: CN217181321U
Application number: CN202220655585.0U
Authority: CN
Inventors: 王彦; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-08-12
Anticipated expiration: 2032-03-24

Abstract

The utility model provides an optics lens group. The optical lens group comprises in order from the object side to the imaging side: the first lens with positive focal power, the object side of the first lens is a convex surface, and the imaging side of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the imaging side surface of the second lens is a concave surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the imaging side surface of the third lens is a convex surface; a fourth lens with negative focal power, wherein the object side surface is a concave surface, and the imaging side surface is a concave surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; satisfies the following conditions: 7.2< f34/(SAG61+ SAG62) < 9.0; the air space T34 between the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy that: 1.3< T34/CT4< 1.8. The utility model provides an optical lens group among the prior art have big image plane, large aperture and the ultra-thin problem that is difficult to realize simultaneously.

Description

Optical lens group

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an optics lens group.

Background

At present, the field of portable electronic products such as mobile phones is well developed. Meanwhile, users also put forward new requirements on the photographing function of portable electronic products, and taking mobile phones as examples, users are more and more interested in photographing effects with large image plane, large aperture and high definition, so that manufacturers are prompted to continuously update the design of the optical lens group on the mobile phones. Meanwhile, with the development of image sensor process technologies such as CCD and CMOS, the number of pixels on a single image sensor is increased and the size of a single pixel is decreased, which puts a higher requirement on the imaging quality of the optical lens group. In addition, in order to facilitate the application of the optical lens assembly to ultra-thin electronic products, it is necessary to ensure that the overall size of the optical lens assembly is small.

That is to say, the optical lens group in the prior art has the problem that large image plane, large aperture and ultra-thin are difficult to realize simultaneously.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an optical lens assembly to solve the problem that the optical lens assembly in the prior art has large image plane, large aperture and ultra-thin being difficult to realize simultaneously.

In order to achieve the above object, the present invention provides an optical lens assembly, which comprises, from an object side to an imaging side according to a predetermined order: the first lens with positive focal power, the object side of the first lens is a convex surface, and the imaging side of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the imaging side surface of the second lens is a concave surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the imaging side surface of the third lens is a convex surface; a fourth lens with negative focal power, wherein the object side surface is a concave surface, and the imaging side surface is a concave surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; wherein, the combined focal length f34 of the third lens and the fourth lens, the on-axis distance SAG61 from the intersection point of the object side surface and the optical axis of the sixth lens to the effective radius vertex of the object side surface of the sixth lens, and the on-axis distance SAG62 from the intersection point of the imaging side surface and the optical axis of the sixth lens to the effective radius vertex of the imaging side surface of the sixth lens satisfy: 7.2< f34/(SAG61+ SAG62) < 9.0; the air space T34 between the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy the following conditions: 1.3< T34/CT4< 1.8.

Further, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy the following conditions: 1.0< f3/(f1+ f5) < 1.5.

Further, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy the following conditions: 2.0< f2/(f4+ f6) < 2.6.

Further, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the imaging side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the imaging side surface of the second lens satisfy: 1.1< R2/R1-R3/R4< 1.5.

Further, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the imaging side of the third lens satisfy: 1.2< (R5-R6)/(R5+ R6) < 1.6.

Further, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the imaging side of the fourth lens satisfy: 1.8< (R8-R7)/(R8+ R7) < 4.8.

Further, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the imaging side surface of the sixth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1.0< (R11+ R12)/R9< 1.5.

Further, the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy the following condition: 1.8< f56/f12< 3.4.

Further, an on-axis distance SAG22 between an intersection point of the imaging side surface of the second lens and the optical axis to an effective radius vertex of the imaging side surface of the second lens, 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, and an on-axis distance SAG42 between an intersection point of the imaging side surface of the fourth lens and the optical axis to an effective radius vertex of the imaging side surface of the fourth lens satisfy: -4.2< (SAG41+ SAG42)/SAG22< -3.6.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.3.

Further, the center thickness CT5 of the fifth lens on the optical axis, the on-axis distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the effective radius vertex of the object side surface of the fifth lens, and the on-axis distance SAG52 between the intersection point of the imaging side surface of the fifth lens and the optical axis and the effective radius vertex of the imaging side surface of the fifth lens satisfy: 0.5< (SAG51-SAG52)/CT5< 0.9.

Further, the center thickness CT5 of the fifth lens on the optical axis, the air space T56 of the fifth lens and the sixth lens on the optical axis, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.5< (CT5+ T56)/(ET5+ ET6) < 2.4.

By applying the technical scheme of the utility model, the optical lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power in sequence from the object side to the imaging side, the object side of the first lens is a convex surface, and the imaging side is a concave surface; the object side surface of the second lens is a convex surface, and the imaging side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the imaging side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the imaging side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; wherein, the combined focal length f34 of the third lens and the fourth lens, the on-axis distance SAG61 from the intersection point of the object side surface and the optical axis of the sixth lens to the effective radius vertex of the object side surface of the sixth lens, and the on-axis distance SAG62 from the intersection point of the imaging side surface and the optical axis of the sixth lens to the effective radius vertex of the imaging side surface of the sixth lens satisfy: 7.2< f34/(SAG61+ SAG62) < 9.0; the air space T34 between the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy that: 1.3< T34/CT4< 1.8.

Through the focal power and the face type of rational configuration each lens, be favorable to the smooth transition of light, be favorable to guaranteeing the stability of formation of image, simultaneously can each lens shape and size of rational planning, the whole size of compression optics lens group to realize miniaturization and large aperture. By constraining the relational expression between the combined focal length f34 of the third lens and the fourth lens, the on-axis distance SAG61 from the intersection point of the object side surface and the optical axis of the sixth lens to the effective radius vertex of the object side surface of the sixth lens, and the on-axis distance SAG62 from the intersection point of the imaging side surface and the optical axis of the sixth lens to the effective radius vertex of the imaging side surface of the sixth lens, the processing and the forming of the sixth lens can be ensured, and simultaneously, the combined focal lengths of the third lens and the fourth lens are distributed, so that the light deflection is smoother, the aberration is favorably reduced, and the imaging quality is favorably ensured. By constraining the ratio between the air space T34 on the optical axis of the third and fourth lenses and the central thickness CT4 on the optical axis of the fourth lens, the field curvature of each field of view can be controlled within a reasonable range while facilitating the compression of the size of the optical lens group.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of an optical lens assembly according to a first embodiment of the present invention;

fig. 2 to 5 respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical lens set in fig. 1;

fig. 6 is a schematic structural view of an optical lens assembly according to a second embodiment of the present invention;

fig. 7 to 10 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical lens set of fig. 6, respectively;

fig. 11 is a schematic structural view of an optical lens assembly according to a third example of the present invention;

fig. 12 to 15 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical lens group of fig. 11;

fig. 16 is a schematic structural view of an optical lens assembly according to a fourth example of the present invention;

fig. 17 to 20 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of the optical lens assembly of fig. 16;

fig. 21 is a schematic structural view of an optical lens assembly according to example five of the present invention;

fig. 22 to 25 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical lens group of fig. 21, respectively.

Wherein the figures include the following reference numerals:

STO, stop; e1, a first lens; s1, the object side surface of the first lens; s2, the imaging side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, the imaging side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, the imaging side surface of the third lens; e4, fourth lens; s7, an object side surface of the fourth lens; s8, the imaging side surface of the fourth lens; e5, fifth lens; s9, the object side surface of the fifth lens; s10, the imaging side surface of the fifth lens; e6, sixth lens; s11, the object side surface of the sixth lens; s12, the imaging side surface of the sixth lens; e7, optical filters; s13, the object side of the optical filter; s14, imaging side face 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 accompanying drawings in conjunction with embodiments.

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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; 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 invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, 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 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 near the object side becomes the object side surface of the lens, and the surface of each lens near the imaging side is called the imaging 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 object side is judged to be convex, and when the R value is negative, the object side is judged to be concave; for the imaged side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

In order to solve the problem that the optical lens group among the prior art has big image plane, large aperture and ultra-thin being difficult to realize simultaneously, the utility model provides an optical lens group.

As shown in fig. 1 to 25, the optical lens group includes, in order from the object side to the image side, a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, and a sixth lens with negative focal power, wherein the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the imaging side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the imaging side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the imaging side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface; wherein, the combined focal length f34 of the third lens and the fourth lens, the on-axis distance SAG61 from the intersection point of the object side surface and the optical axis of the sixth lens to the effective radius vertex of the object side surface of the sixth lens, and the on-axis distance SAG62 from the intersection point of the imaging side surface and the optical axis of the sixth lens to the effective radius vertex of the imaging side surface of the sixth lens satisfy: 7.2< f34/(SAG61+ SAG62) < 9.0; the air space T34 between the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy that: 1.3< T34/CT4< 1.8.

Preferably 7.4< f34/(SAG61+ SAG62) < 8.8.

Preferably, 1.3< T34/CT4< 1.6.

Through the focal power and the face type of rational configuration each lens, be favorable to the smooth transition of light, be favorable to guaranteeing the stability of formation of image, simultaneously can each lens shape and size of rational planning, the whole size of compression optics lens group to realize miniaturization and large aperture. By constraining the relational expressions among the axial distance SAG61 between the combined focal length f34 of the third lens and the fourth lens, the axial distance between the intersection point of the object side surface and the optical axis of the sixth lens and the effective radius vertex of the object side surface of the sixth lens, and the axial distance SAG62 between the intersection point of the imaging side surface and the optical axis of the sixth lens and the effective radius vertex of the imaging side surface of the sixth lens, the processing and the forming of the sixth lens can be ensured, the combined focal lengths of the third lens and the fourth lens are distributed, the light deflection is smoother, the aberration is favorably reduced, and the imaging quality is favorably ensured. By constraining the ratio between the air space T34 on the optical axis of the third and fourth lenses and the central thickness CT4 on the optical axis of the fourth lens, the field curvature of each field of view can be controlled within a reasonable range while facilitating the compression of the size of the optical lens group.

In the embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy the following conditions: 1.0< f3/(f1+ f5) < 1.5. Satisfying the conditional expression, the focal power of the whole system can be reasonably distributed, and the sensitivity of the system is reduced. Preferably, 1.1< f3/(f1+ f5) < 1.2.

In the embodiment, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens satisfy the following conditions: 2.0< f2/(f4+ f6) < 2.6. The conditional expression is satisfied, the contribution of each lens to the aberration of the system can be reasonably controlled, and the system has better imaging quality. Preferably, 2.1< f2/(f4+ f6) < 2.5.

In the present embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first 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: 1.1< R2/R1-R3/R4< 1.5. The condition is satisfied, so that CRA matching of the optical lens group is ensured, curvature of field of the optical lens group is corrected, and imaging definition requirements of each view field are satisfied. Preferably, 1.2< R2/R1-R3/R4< 1.3.

In the present embodiment, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the imaging side surface of the third lens satisfy: 1.2< (R5-R6)/(R5+ R6) < 1.6. The third lens can be reasonably controlled in processability and mass production can be ensured by satisfying the conditional expression. Preferably, 1.2< (R5-R6)/(R5+ R6) < 1.4.

In the present embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the imaging side surface of the fourth lens satisfy: 1.8< (R8-R7)/(R8+ R7) < 4.8. The method satisfies the conditional expression, can reasonably control the deflection angle of the edge light of the system, and ensures the imaging quality. Preferably, 1.9< (R8-R7)/(R8+ R7) < 4.7.

In the present embodiment, the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the imaging side surface of the sixth lens, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 1.0< (R11+ R12)/R9< 1.5. The field curvature of the system can be reasonably distributed by meeting the conditional expression, so that the field curvature of the system is in a certain range. Preferably, 1.1< (R11+ R12)/R9< 1.3.

In the embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy the following conditions: 1.8< f56/f12< 3.4. The spherical aberration generated by the front lens and the rear lens of the system can be balanced by meeting the conditional expression, so that the spherical aberration of the system is finely adjusted, and the aberration of an on-axis field of view is reduced. Preferably, 2.0< f56/f12< 3.3.

In the present embodiment, the on-axis distance SAG22 between the intersection of the imaging side surface of the second lens and the optical axis to the effective radius vertex of the imaging side surface of the second lens, the on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens, and the on-axis distance SAG42 between the intersection of the imaging side surface of the fourth lens and the optical axis to the effective radius vertex of the imaging side surface of the fourth lens satisfy: -4.2< (SAG41+ SAG42)/SAG22< -3.6. The condition is satisfied, and the processing and forming of the second lens and the fourth lens are guaranteed, so that a good imaging effect is obtained. An unreasonable ratio may cause difficulty in adjusting the molding surface shape, and the molding surface shape is easily deformed obviously after being assembled, so that the imaging quality cannot be ensured. Preferably, -4.1< (SAG41+ SAG42)/SAG22< -3.8.

In this embodiment, an on-axis distance TTL from the object side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.3. The characteristics of ultra-thin and large image surface of the optical lens group can be realized by constraining the ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface within a reasonable range.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis, the on-axis distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the effective radius vertex of the object side surface of the fifth lens, and the on-axis distance SAG52 between the intersection point of the imaging side surface of the fifth lens and the optical axis and the effective radius vertex of the imaging side surface of the fifth lens satisfy: 0.5< (SAG51-SAG52)/CT5< 0.9. The conditional expression is satisfied, the incidence angle of the chief ray of the fifth lens can be effectively reduced, and the matching degree of the optical lens group and the chip can be improved. Preferably, 0.5< (SAG51-SAG52)/CT5< 0.8.

In the present embodiment, the central thickness CT5 of the fifth lens on the optical axis, the air space T56 between the fifth lens and the sixth lens on the optical axis, the edge thickness ET5 of the fifth lens and the edge thickness ET6 of the sixth lens satisfy: 1.5< (CT5+ T56)/(ET5+ ET6) < 2.4. The condition is satisfied, the influence of ghost images in the system can be effectively reduced, and a better imaging effect is obtained. Preferably, 1.7< (CT5+ T56)/(ET5+ ET6) < 2.3.

Optionally, the optical lens group may further include a filter for correcting color deviation or a protective glass for protecting a photosensitive element on the image plane.

The optical lens assembly in the present application may employ a plurality of lenses, such as the six lenses described above. The optical lens group is more beneficial to production and processing and is applicable to portable electronic equipment such as smart phones and the like by reasonably distributing the focal power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like, so that the sensitivity of the lens can be effectively reduced and the processability of the lens can be improved. The left side is the object side and the right side is the imaging side.

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 is understood by those skilled in the art that the number of lenses constituting the optical lens group may be varied to obtain the various results and advantages described in the present description without departing from the technical solutions claimed in the present application. For example, although six lenses are exemplified in the embodiments, the optical lens group is not limited to include six lenses. The optical lens set can also include other numbers of lenses, if necessary.

Examples of specific surface types and parameters of the optical lens set 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 the embodiments of the present application.

Example one

Fig. 1 to 5 show an optical lens assembly according to a first example of the present application. Fig. 1 is a schematic diagram illustrating a structure of an optical lens set according to an example one.

As shown in fig. 1, the optical lens assembly includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

The first lens E1 has positive optical power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The second lens E2 has negative 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 optical 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 concave surface, and the image side surface S8 of the fourth lens is a concave surface. The fifth lens E5 has positive optical 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 negative 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 a filter object side surface S13 and a filter image side surface S14. 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 optical lens assembly is 5.04mm, the total system length TTL of the optical lens assembly is 6.20mm, and the image height ImgH is 4.95 mm.

Table 1 shows a basic structural parameter table of the optical lens assembly of example one, wherein the radius of curvature and the thickness/distance are all in millimeters (mm).

TABLE 1

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

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c 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 aspherical 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 optical lens assembly of the first example, which shows the deviation of the convergent focus of light rays with different wavelengths after passing through the optical lens assembly. FIG. 3 shows astigmatism curves for the first example set of optical lenses representing meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the optical lens assembly of the first example, which show distortion magnitude values corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the optical lens assembly of the first example, which shows the deviation of different image heights of the light passing through the optical lens assembly on the image plane.

As can be seen from fig. 2 to 5, the optical lens assembly of the example one can achieve good imaging quality.

Example two

Fig. 6 to 10 show an optical lens assembly according to the second embodiment of the present application. 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 illustrating a structure of an optical lens set of example two.

As shown in fig. 6, the optical lens assembly includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

In this example, the total effective focal length f of the optical lens assembly is 5.03mm, the total system length TTL of the optical lens assembly is 6.19mm, and the image height ImgH is 4.80 mm.

Table 3 shows a basic structural parameter table of the optical lens assembly of example two, wherein the radius of curvature and the thickness/distance 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

-1.0711E-02

1.0410E-01

-5.6177E-01

1.9360E+00

-4.4777E+00

7.2057E+00

-8.2565E+00

S2

-1.5449E-02

-3.9933E-02

1.9088E-01

-4.4258E-01

3.4330E-01

8.8419E-01

-3.1489E+00

S3

-5.6145E-02

1.2863E-01

-9.3772E-01

4.4764E+00

-1.4050E+01

3.0578E+01

-4.7343E+01

S4

-1.7851E-02

-1.8073E-01

2.0151E+00

-1.2613E+01

5.1239E+01

-1.4197E+02

2.7693E+02

S5

-4.7566E-02

3.4416E-01

-2.7421E+00

1.3551E+01

-4.5599E+01

1.0826E+02

-1.8531E+02

S6

-3.7541E-02

1.6048E-02

-2.8113E-02

7.9229E-02

-6.8012E-01

2.6088E+00

-5.6198E+00

S7

-1.5090E-01

1.4697E-01

-6.9375E-02

-3.1861E-01

1.0349E+00

-1.6882E+00

1.7997E+00

S8

-2.2341E-01

2.3873E-01

-2.6457E-01

1.8436E-01

-2.2421E-02

-9.3196E-02

1.0406E-01

S9

-7.8277E-02

8.4601E-02

-1.1339E-01

1.1330E-01

-9.0698E-02

5.6325E-02

-2.6134E-02

S10

-9.9089E-04

3.9084E-02

-3.7318E-02

1.6128E-02

-4.5323E-03

1.3150E-03

-5.1838E-04

S11

-2.4554E-01

1.1950E-01

-3.1119E-02

-4.4430E-03

7.4227E-03

-3.2291E-03

8.3353E-04

S12

-2.7764E-01

1.8081E-01

-1.0043E-01

4.3749E-02

-1.4583E-02

3.6471E-03

-6.7665E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.8194E+00

-4.0678E+00

1.7353E+00

-5.1607E-01

1.0159E-01

-1.1893E-02

6.2673E-04

S2

4.8774E+00

-4.6547E+00

2.9385E+00

-1.2349E+00

3.3317E-01

-5.2320E-02

3.6396E-03

S3

5.2776E+01

-4.2401E+01

2.4289E+01

-9.6619E+00

2.5324E+00

-3.9272E-01

2.7264E-02

S4

-3.8648E+02

3.8738E+02

-2.7638E+02

1.3687E+02

-4.4693E+01

8.6475E+00

-7.5062E-01

S5

2.3115E+02

-2.1025E+02

1.3797E+02

-6.3617E+01

1.9561E+01

-3.6025E+00

3.0068E-01

S6

7.7236E+00

-7.1410E+00

4.5133E+00

-1.9281E+00

5.3323E-01

-8.6252E-02

6.1999E-03

S7

-1.3405E+00

7.1632E-01

-2.7590E-01

7.5232E-02

-1.3825E-02

1.5375E-03

-7.8155E-05

S8

-5.9268E-02

2.1048E-02

-4.8685E-03

7.2851E-04

-6.7115E-05

3.3720E-06

-6.6756E-08

S9

8.8725E-03

-2.1742E-03

3.7808E-04

-4.5325E-05

3.5518E-06

-1.6344E-07

3.3446E-09

S10

1.8359E-04

-4.5503E-05

7.5690E-06

-8.3361E-07

5.8511E-08

-2.3748E-09

4.2459E-11

S11

-1.4394E-04

1.7241E-05

-1.4404E-06

8.2491E-08

-3.0909E-09

6.8314E-11

-6.7565E-13

S12

9.2393E-05

-9.1936E-06

6.5576E-07

-3.2560E-08

1.0665E-09

-2.0685E-11

1.7971E-13

TABLE 4

Fig. 7 shows an axial chromatic aberration curve of the optical lens assembly of example two, which shows the deviation of the convergence focus of light rays with different wavelengths after passing through the optical lens assembly. FIG. 8 shows astigmatism curves for the second set of optical lenses, representing meridional and sagittal curvature of field. Fig. 9 shows a distortion curve of the optical lens assembly of example two, which shows distortion magnitude values corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the optical lens assembly of the second example, which shows the deviation of different image heights of the light passing through the optical lens assembly on the image plane.

As can be seen from fig. 7 to 10, the optical lens assembly of example two can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an optical lens assembly of example three of the present application is described. Fig. 11 is a schematic diagram illustrating a structure of an optical lens set of example three.

As shown in fig. 11, the optical lens assembly includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

In this example, the total effective focal length f of the optical lens assembly is 5.03mm, the total system length TTL of the optical lens assembly is 6.18mm, and the image height ImgH is 4.90 mm.

Table 5 shows a basic structural parameter table of the optical lens assembly of example three, wherein the radius of curvature and the thickness/distance 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

-1.2198E-02

1.1927E-01

-6.4830E-01

2.2434E+00

-5.2034E+00

8.3916E+00

-9.6325E+00

S2

-1.4450E-02

-5.1995E-02

2.6197E-01

-7.0272E-01

9.6797E-01

-1.4310E-01

-1.9644E+00

S3

-5.6785E-02

1.4307E-01

-1.0501E+00

4.9784E+00

-1.5531E+01

3.3612E+01

-5.1774E+01

S4

-1.5316E-02

-2.1401E-01

2.3337E+00

-1.4529E+01

5.8873E+01

-1.6306E+02

3.1840E+02

S5

-5.0854E-02

4.0312E-01

-3.2241E+00

1.6001E+01

-5.3964E+01

1.2823E+02

-2.1949E+02

S6

-3.6903E-02

7.5992E-03

4.0407E-02

-2.2801E-01

1.4794E-01

1.1639E+00

-3.9501E+00

S7

-1.5095E-01

1.5422E-01

-9.3777E-02

-3.0422E-01

1.1208E+00

-1.9622E+00

2.2249E+00

S8

-2.1768E-01

2.3875E-01

-2.7799E-01

2.1137E-01

-5.0311E-02

-7.6993E-02

9.9789E-02

S9

-7.6960E-02

8.5962E-02

-1.2130E-01

1.2831E-01

-1.0749E-01

6.8790E-02

-3.2559E-02

S10

-6.2976E-03

4.4571E-02

-4.5726E-02

2.6064E-02

-1.2253E-02

5.3713E-03

-2.0106E-03

S11

-2.4574E-01

1.2252E-01

-3.6416E-02

2.0155E-04

4.9711E-03

-2.3940E-03

6.4125E-04

S12

-2.7578E-01

1.8057E-01

-1.0147E-01

4.4795E-02

-1.5107E-02

3.8124E-03

-7.1208E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

7.9684E+00

-4.7599E+00

2.0333E+00

-6.0541E-01

1.1930E-01

-1.3981E-02

7.3742E-04

S2

3.9122E+00

-4.1026E+00

2.7225E+00

-1.1802E+00

3.2532E-01

-5.1895E-02

3.6540E-03

S3

5.7451E+01

-4.5970E+01

2.6238E+01

-1.0402E+01

2.7176E+00

-4.2010E-01

2.9067E-02

S4

-4.4531E+02

4.4761E+02

-3.2045E+02

1.5932E+02

-5.2245E+01

1.0155E+01

-8.8564E-01

S5

2.7360E+02

-2.4858E+02

1.6287E+02

-7.4958E+01

2.2998E+01

-4.2251E+00

3.5172E-01

S6

6.4707E+00

-6.5924E+00

4.4430E+00

-1.9906E+00

5.7189E-01

-9.5535E-02

7.0649E-03

S7

-1.7591E+00

9.9732E-01

-4.0716E-01

1.1742E-01

-2.2743E-02

2.6555E-03

-1.4118E-04

S8

-5.9770E-02

2.1769E-02

-5.0837E-03

7.5506E-04

-6.7205E-05

3.0805E-06

-4.6406E-08

S9

1.1219E-02

-2.7843E-03

4.9001E-04

-5.9446E-05

4.7151E-06

-2.1967E-07

4.5520E-09

S10

5.7589E-04

-1.1967E-04

1.7577E-05

-1.7735E-06

1.1686E-07

-4.5257E-09

7.8075E-11

S11

-1.1313E-04

1.3756E-05

-1.1627E-06

6.7212E-08

-2.5377E-09

5.6443E-11

-5.6116E-13

S12

9.7715E-05

-9.7601E-06

6.9824E-07

-3.4753E-08

1.1406E-09

-2.2157E-11

1.9277E-13

TABLE 6

Fig. 12 shows an axial chromatic aberration curve of the optical lens assembly of example three, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens assembly. FIG. 13 shows astigmatism curves for the optical lens group of example three, which represent meridional field curvature and sagittal field curvature. Fig. 14 shows distortion curves of the optical lens group of example three, which show values of distortion magnitudes for different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the optical lens assembly of example three, which shows the deviation of different image heights of the light passing through the optical lens assembly on the image plane.

As can be seen from fig. 12 to 15, the optical lens assembly of the third example can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an optical lens assembly of example four of the present application is described. Fig. 16 is a schematic diagram of an optical lens set structure in example four.

As shown in fig. 16, the optical lens assembly includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

In this example, the total effective focal length f of the optical lens assembly is 5.01mm, the total system length TTL of the optical lens assembly is 6.17mm, and the image height ImgH is 4.95 mm.

Table 7 shows a table of basic structural parameters for the optical lens set of example four, wherein the radius of curvature and the thickness/distance are all in millimeters (mm).

TABLE 7

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

TABLE 8

Fig. 17 shows an axial chromatic aberration curve of the optical lens assembly of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens assembly. FIG. 18 shows astigmatism curves for the optical lens group of example four, representing meridional and sagittal image planes curvature. Fig. 19 shows distortion curves of the optical lens assembly of example four, which show values of distortion magnitudes for different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the optical lens assembly of example four, which shows the deviation of different image heights of the light beam on the image plane after passing through the optical lens assembly.

As can be seen from fig. 17 to 20, the optical lens assembly of example four can achieve good imaging quality.

Example five

Fig. 21 to 25 show an optical lens assembly according to example five of the present application. Fig. 21 is a schematic diagram illustrating a structure of an optical lens group in example five.

As shown in fig. 21, the optical lens assembly includes, in order from an object side to an image side: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane S15.

In this example, the total effective focal length f of the optical lens assembly is 5.00mm, the total system length TTL of the optical lens assembly is 6.14mm, and the image height ImgH is 4.95 mm.

Table 9 shows a table of basic structural parameters for the optical lens set of example five, wherein the radius of curvature and thickness/distance are 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.

Watch 10

Fig. 22 shows an axial chromatic aberration curve of the optical lens group of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical lens group. FIG. 23 shows astigmatism curves for the optical lens group of example five, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the optical lens group of example five, which show values of distortion magnitudes for different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the optical lens assembly of example five, which shows the deviation of different image heights of light rays passing through the optical lens assembly on the image plane.

As can be seen from fig. 22 to 25, the optical 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.

Conditional formula/example	1	2	3	4	5
						TTL/ImgH	1.25	1.29	1.26	1.25	1.24
T34/CT4	1.41	1.40	1.38	1.37	1.50
						f3/(f1+f5)	1.18	1.19	1.16	1.17	1.13
f2/(f4+f6)	2.20	2.23	2.29	2.31	2.40
						R2/R1-R3/R4	1.25	1.25	1.24	1.24	1.23
(R5-R6)/(R5+R6)	1.31	1.31	1.32	1.32	1.30
						(R8-R7)/(R8+R7)	4.69	4.69	2.69	2.60	1.96
(R11+R12)/R9	1.29	1.28	1.23	1.22	1.12
						f56/f12	2.04	2.06	2.40	2.40	3.22
(SAG41+SAG42)/SAG22	-3.89	-3.89	-3.92	-3.94	-4.01
						f34/(SAG61+SAG62)	7.48	7.58	7.82	7.77	8.78
(SAG51-SAG52)/CT5	0.71	0.60	0.69	0.72	0.71
						(CT5+T56)/(ET5+ET6)	1.97	1.72	2.04	2.17	2.20

Table 11 table 12 shows the effective focal lengths f of the optical lens sets of examples one to five, the effective focal lengths f1 to f6 of the respective lenses, and so on.

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 optical lens set described above.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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

1. An optical lens assembly, comprising, in order from an object side to an image side:

the first lens with positive focal power, the object side of the first lens is a convex surface, and the imaging side of the first lens is a concave surface;

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

a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the imaging side surface of the third lens is a convex surface;

a fourth lens with negative focal power, wherein the object side surface is a concave surface, and the imaging side surface is a concave surface;

the object side surface of the fifth lens is a convex surface, and the imaging side surface of the fifth lens is a concave surface;

the object side surface of the sixth lens is a convex surface, and the imaging side surface of the sixth lens is a concave surface;

wherein, the combined focal length f34 of the third lens and the fourth lens, the on-axis distance SAG61 from the intersection point of the object side surface and the optical axis of the sixth lens to the effective radius vertex of the object side surface of the sixth lens, and the on-axis distance SAG62 from the intersection point of the imaging side surface of the sixth lens and the optical axis to the effective radius vertex of the imaging side surface of the sixth lens satisfy: 7.2< f34/(SAG61+ SAG62) < 9.0; the air interval T34 of the third lens and the fourth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy that: 1.3< T34/CT4< 1.8.

2. The set of optical lenses of claim 1, wherein the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f5 of the fifth lens satisfy: 1.0< f3/(f1+ f5) < 1.5.

3. The set of optical lenses of claim 1, wherein the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens, and the effective focal length f6 of the sixth lens satisfy: 2.0< f2/(f4+ f6) < 2.6.

4. The set of optical lenses of claim 1, wherein the radius of curvature of the object side of the first lens, R1, R2, R3 and R4 satisfy: 1.1< R2/R1-R3/R4< 1.5.

5. The optical lens group of claim 1, wherein a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the imaging side surface of the third lens satisfy: 1.2< (R5-R6)/(R5+ R6) < 1.6.

6. The optical lens group of claim 1, wherein a radius of curvature R7 of the object side surface of the fourth lens and a radius of curvature R8 of the imaging side surface of the fourth lens satisfy: 1.8< (R8-R7)/(R8+ R7) < 4.8.

7. The optical lens group of claim 1, wherein a radius of curvature R11 of the object side surface of the sixth lens, a radius of curvature R12 of the imaging side surface of the sixth lens, and a radius of curvature R9 of the object side surface of the fifth lens satisfy: 1.0< (R11+ R12)/R9< 1.5.

8. The set of optical lenses of claim 1, wherein a combined focal length f12 of the first and second lenses and a combined focal length f56 of the fifth and sixth lenses satisfies: 1.8< f56/f12< 3.4.

9. The optical lens group of claim 1, wherein an on-axis distance SAG22 from an intersection of an imaging side surface of the second lens and an optical axis to an effective radius vertex of the imaging side surface of the second lens, an on-axis distance SAG41 from 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, and an on-axis distance SAG42 from an intersection of an imaging side surface of the fourth lens and the optical axis to an effective radius vertex of the imaging side surface of the fourth lens satisfy: -4.2< (SAG41+ SAG42)/SAG22< -3.6.

10. The optical lens group of claim 1, wherein an on-axis distance TTL from an object side surface to an image plane of the first lens element to a half ImgH of a diagonal length of an effective pixel area on the image plane satisfies: TTL/ImgH < 1.3.

11. The set of optical lenses of claim 1, wherein the central thickness CT5 of the fifth lens on the optical axis, the on-axis distance SAG51 between the intersection of the object side of the fifth lens and the optical axis and the effective radius vertex of the object side of the fifth lens and the on-axis distance SAG52 between the intersection of the imaging side of the fifth lens and the optical axis and the effective radius vertex of the imaging side of the fifth lens satisfy: 0.5< (SAG51-SAG52)/CT5< 0.9.

12. The optical lens group of claim 1, wherein a center thickness CT5 of the fifth lens on an optical axis, an air space T56 of the fifth lens and the sixth lens on the optical axis, an edge thickness ET5 of the fifth lens and an edge thickness ET6 of the sixth lens satisfy: 1.5< (CT5+ T56)/(ET5+ ET6) < 2.4.