CN114594573B - Imaging lens group - Google Patents

Abstract

The invention provides an imaging lens group. The imaging lens group includes: a first lens having positive optical power, the object side of which is convex, and the imaging side of which is concave; a second lens having negative optical power, the object side of which is convex and the imaging side of which is concave; a third lens with positive focal power, the object side of which is concave, and the imaging side of which is convex; a fourth lens having positive optical power, the object side of which is convex, and the imaging side of which is convex; a fifth lens having negative optical power, the object side of which is convex, and the imaging side of which is concave; the on-axis distance TTL from the object side of the first lens to the imaging surface and half the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.3; the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy: 70< (v1+v3+v5)/3 <85. The invention solves the problem that the imaging lens group in the prior art has large image plane, large aperture and good color difference performance which are difficult to consider simultaneously.

Description

Imaging lens group

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an imaging lens group.

Background

Along with the continuous development of technology, the mobile phone camera shooting field is increasingly competitive, especially on the imaging lens group of the high-end flagship model, besides the requirements of larger image surface and larger aperture, the requirements on the chromatic aberration of the imaging lens group are also higher and higher, meanwhile, good imaging quality needs to be ensured, and meanwhile, the whole size of the imaging lens group is not excessively large so as to be applied to ultrathin electronic products, which clearly presents higher difficulty challenges for the design of the imaging lens group.

That is, the imaging lens group in the prior art has the problem that the large image plane, the large aperture and the good chromatic aberration performance are difficult to be simultaneously combined.

Disclosure of Invention

The invention mainly aims to provide an imaging lens group so as to solve the problem that the imaging lens group in the prior art has a large image plane, a large aperture and good chromatic aberration performance which are difficult to be simultaneously considered.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens group comprising, in order from an object side to an imaging side: a first lens having positive optical power, the object side of which is convex, and the imaging side of which is concave; a second lens having negative optical power, the object side of which is convex and the imaging side of which is concave; a third lens with positive focal power, the object side of which is concave, and the imaging side of which is convex; a fourth lens having positive optical power, the object side of which is convex, and the imaging side of which is convex; a fifth lens having negative optical power, the object side of which is convex, and the imaging side of which is concave; and at least 3 lenses of the first lens to the fifth lens are made of glass materials, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH <1.3; the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy: 70< (v1+v3+v5)/3 <85.

Further, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.9< f 3/(f1+f4) <1.3.

Further, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.1< f2/f5<2.6.

Further, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the imaging side of the first lens, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the imaging side of the second lens satisfy: 0.8< (R1+R2)/(R3+R4) <1.2.

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: 5.0< R5/R6<5.6.

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: 1.6< (R7-R8)/(R7+R8) <2.2.

Further, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the imaging side of the fifth lens satisfy: 3.2< R9/R10<4.2.

Further, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 3.2< f 123/(c1+c2+c3) <3.8.

Further, the on-axis distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens, the on-axis distance SAG42 between the intersection point of the imaging side surface of the fourth lens and the optical axis and the effective radius vertex of the imaging side surface of the fourth lens, 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: 2.8< f 45/(sag41+sag42+sag51+sag52) <3.4.

Further, the air interval T34 between the third lens and the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 1.4< (T34+T45)/(Ct4+Ct5) <1.8.

Further, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET5 of the fifth lens and the edge thickness ET4 of the fourth lens satisfy: 1.2< (ET 4+ ET 5)/(ET 2+ ET 3) <1.6.

According to another aspect of the present invention, there is provided an imaging lens group comprising, in order from an object side to an imaging side: a first lens having positive optical power, the object side of which is convex, and the imaging side of which is concave; a second lens having negative optical power, the object side of which is convex and the imaging side of which is concave; a third lens with positive focal power, the object side of which is concave, and the imaging side of which is convex; a fourth lens having positive optical power, the object side of which is convex, and the imaging side of which is convex; a fifth lens having negative optical power, the object side of which is convex, and the imaging side of which is concave; at least 3 lenses of the first lens to the fifth lens are made of glass materials, and the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy the following conditions: 70< (v1+v3+v5)/3 <85; the air interval T34 between the third lens and the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy the following conditions: 1.4< (T34+T45)/(Ct4+Ct5) <1.8.

Further, the on-axis distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.3; the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy the following conditions: 0.9< f 3/(f1+f4) <1.3.

Further, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.1< f2/f5<2.6.

Further, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the imaging side of the first lens, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the imaging side of the second lens satisfy: 0.8< (R1+R2)/(R3+R4) <1.2.

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: 5.0< R5/R6<5.6.

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: 1.6< (R7-R8)/(R7+R8) <2.2.

Further, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the imaging side of the fifth lens satisfy: 3.2< R9/R10<4.2.

Further, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 3.2< f 123/(c1+c2+c3) <3.8.

Further, the on-axis distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens, the on-axis distance SAG42 between the intersection point of the imaging side surface of the fourth lens and the optical axis and the effective radius vertex of the imaging side surface of the fourth lens, 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: 2.8< f 45/(sag41+sag42+sag51+sag52) <3.4.

Further, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET5 of the fifth lens and the edge thickness ET4 of the fourth lens satisfy: 1.2< (ET 4+ ET 5)/(ET 2+ ET 3) <1.6.

By applying the technical scheme of the invention, the imaging 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 positive focal power and a fifth lens with negative focal power from the object side to the imaging side in sequence; the object side surface of the first lens is a convex surface, and the imaging side surface is a concave surface; the object side surface of the second lens is convex, and the imaging side surface is concave; the object side surface of the third lens is a concave surface, and the imaging side surface is a convex surface; the object side surface of the fourth lens is a convex surface, and the imaging side surface is a convex surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface is a concave surface; and at least 3 lenses of the first lens to the fifth lens are made of glass materials, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH <1.3; the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy: 70< (v1+v3+v5)/3 <85.

The focal power and the surface shape of each lens are reasonably restrained, so that smooth transition of light is facilitated, and meanwhile, the characteristics of large image surface and large aperture of the imaging lens group are guaranteed, and good imaging quality of the imaging lens group is guaranteed. At least 3 lenses of the first lens to the fifth lens are made of glass materials, so that good color edge expression can be realized by utilizing the characteristic of high Abbe number of the glass materials, and better imaging effect can be achieved. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface is restrained, so that the ultrathin characteristic and the miniaturization characteristic of the imaging lens group are realized, and the imaging lens group can be applied to ultrathin electronic products. The Abbe number V1 of the first lens, the Abbe number V3 of the third lens and the Abbe number V5 of the fifth lens are reasonably constrained, so that the chromatic dispersion degree of the system is reasonably controlled, and the chromatic aberration correcting capability of the imaging lens group is improved, so that a better imaging effect is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic diagram of an imaging lens set according to example one of the present invention;

FIGS. 2-5 show on-axis, astigmatic, distortion, and power chromatic curves, respectively, of the imaging lens set of FIG. 1;

FIG. 6 shows a schematic diagram of an imaging lens set of example two of the present invention;

fig. 7 to 10 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging lens group of fig. 6;

FIG. 11 shows a schematic structural view of an imaging lens set of example three of the present invention;

FIGS. 12-15 show on-axis, astigmatic, distortion, and power chromatic curves, respectively, of the imaging lens set of FIG. 11;

FIG. 16 shows a schematic of the structure of an imaging lens set of example four of the present invention;

fig. 17 to 20 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging lens group of fig. 16;

FIG. 21 shows a schematic diagram of the structure of an imaging lens set of example five of the present invention;

fig. 22 to 25 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging lens group in fig. 21.

Wherein the above figures include the following reference numerals:

STO and diaphragm; e1, a first lens; s1, an object side surface of a first lens; s2, an imaging side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, an imaging side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens; s6, an imaging side surface of the third lens; e4, a fourth lens; s7, the object side surface of the fourth lens; s8, an imaging side surface of the fourth lens; e5, a fifth lens; s9, the object side surface of the fifth lens; s10, an imaging side surface of a fifth lens; e6, an optical filter; s11, the object side surface of the optical filter; s12, an imaging side surface of the optical filter; s13, an imaging surface.

Detailed Description

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

It is noted that 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 unless otherwise indicated.

In the present application, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present application.

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the imaging side is referred to as the imaging side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side, 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; in the image forming side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

The invention provides an imaging lens group in order to solve the problem that the imaging lens group in the prior art has a large image plane, a large aperture and good chromatic aberration performance which are difficult to consider simultaneously.

Example 1

As shown in fig. 1 to 25, the imaging lens group includes, in order from the object side to the imaging side, a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having positive optical power, and a fifth lens having negative optical power; the object side surface of the first lens is a convex surface, and the imaging side surface is a concave surface; the object side surface of the second lens is convex, and the imaging side surface is concave; the object side surface of the third lens is a concave surface, and the imaging side surface is a convex surface; the object side surface of the fourth lens is a convex surface, and the imaging side surface is a convex surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface is a concave surface; and at least 3 lenses of the first lens to the fifth lens are made of glass materials, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH <1.3; the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy: 70< (v1+v3+v5)/3 <85.

Preferably, 74< (v1+v3+v5)/3 <77.

The focal power and the surface shape of each lens are reasonably restrained, so that smooth transition of light is facilitated, and meanwhile, the characteristics of large image surface and large aperture of the imaging lens group are guaranteed, and good imaging quality of the imaging lens group is guaranteed. At least 3 lenses of the first lens to the fifth lens are made of glass materials, so that good color edge expression can be realized by utilizing the characteristic of high Abbe number of the glass materials, and better imaging effect can be achieved. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface is restrained, so that the ultrathin characteristic and the miniaturization characteristic of the imaging lens group are realized, and the imaging lens group can be applied to ultrathin electronic products. The Abbe number V1 of the first lens, the Abbe number V3 of the third lens and the Abbe number V5 of the fifth lens are reasonably constrained, so that the chromatic dispersion degree of the system is reasonably controlled, and the chromatic aberration correcting capability of the imaging lens group is improved, so that a better imaging effect is realized.

In this embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.9< f 3/(f1+f4) <1.3. The conditional expression is satisfied, and the contribution of three lenses to the aberration of the whole optical system can be effectively restrained, so that the imaging quality of the imaging lens group is improved. Preferably, 1.0< f 3/(f1+f4) <1.2.

In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.1< f2/f5<2.6. The optical sensitivity of the second lens and the fifth lens can be effectively reduced by meeting the conditional expression, and the mass production is more facilitated. Preferably 2.3< f2/f5<2.5.

In the present embodiment, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the imaging side of the first lens, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the imaging side of the second lens satisfy: 0.8< (R1+R2)/(R3+R4) <1.2. The optical path deflection device meets the condition, so that the imaging lens group can better realize optical path deflection and can better balance the advanced spherical aberration generated by the imaging lens group. Preferably, 0.9< (r1+r2)/(r3+r4) <1.1.

In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the imaging side surface of the third lens satisfy: 5.0< R5/R6<5.6. The on-axis aberration generated by the imaging lens group can be effectively balanced by meeting the conditional expression. Preferably, 5.2< R5/R6<5.5.

In the present embodiment, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the imaging side surface of the fourth lens satisfy: 1.6< (R7-R8)/(R7+R8) <2.2. The condition is satisfied, so that the imaging lens group can better realize light path deflection, and meanwhile, the fourth lens is guaranteed to have good machinability, and the sensitivity of the system is reduced. Preferably, 1.8< (R7-R8)/(R7 + R8) <2.2.

In the present embodiment, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the imaging side surface of the fifth lens satisfy: 3.2< R9/R10<4.2. The on-axis aberration generated by the imaging lens group can be effectively balanced by meeting the conditional expression. Preferably 3.4< R9/R10<4.0.

In the present embodiment, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 3.2< f 123/(c1+c2+c3) <3.8. The sensitivity of the front lenses can be reduced by meeting the conditional expression, and the yield is improved while the processability is ensured. Preferably, 3.4< f 123/(CT 1+ CT2+ CT 3) <3.7.

In the present embodiment, the on-axis distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens, the on-axis distance SAG42 between the intersection point of the imaging side surface of the fourth lens and the optical axis and the effective radius vertex of the imaging side surface of the fourth lens, 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: 2.8< f 45/(sag41+sag42+sag51+sag52) <3.4. The processing, forming and assembling of the fourth lens and the fifth lens are guaranteed to meet the condition, so that good imaging quality is obtained. The unreasonable ratio can cause difficult adjustment of molding surface type, easy deformation after assembly is obvious, and further the imaging quality can not be ensured. Preferably, 2.9< f 45/(sag41+sag42+sag51+sag52) <3.3.

In the present embodiment, the air space T34 between the third lens and the fourth lens on the optical axis, the air space T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 1.4< (T34+T45)/(Ct4+Ct5) <1.8. The condition is satisfied to control the field curvature contribution of each view field of the imaging lens group within a reasonable range, balance the generated field curvature of other lenses and effectively improve the resolution. Preferably, 1.5< (t34+t45)/(CT 4+ct 5) <1.7.

In the present embodiment, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET5 of the fifth lens and the edge thickness ET4 of the fourth lens satisfy: 1.2< (ET 4+ ET 5)/(ET 2+ ET 3) <1.6. The uniformity of lens shape transition and the reliability of subsequent molding assembly are reasonably controlled by controlling the edge thickness of the second lens to the fifth lens; meanwhile, the range of incident light rays can be reasonably limited, off-axis aberration is reduced, and the sensitivity of the system is reduced. Preferably, 1.3< (ET 4+ ET 5)/(ET 2+ ET 3) <1.5.

Example two

As shown in fig. 1 to 25, the imaging lens group includes, in order from an object side to an imaging side: a first lens having positive optical power, the object side of which is convex, and the imaging side of which is concave; a second lens having negative optical power, the object side of which is convex and the imaging side of which is concave; a third lens with positive focal power, the object side of which is concave, and the imaging side of which is convex; a fourth lens having positive optical power, the object side of which is convex, and the imaging side of which is convex; a fifth lens having negative optical power, the object side of which is convex, and the imaging side of which is concave; at least 3 lenses of the first lens to the fifth lens are made of glass materials, and the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy the following conditions: 70< (v1+v3+v5)/3 <85; the air interval T34 between the third lens and the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy the following conditions: 1.4< (T34+T45)/(Ct4+Ct5) <1.8.

Preferably, 74< (v1+v3+v5)/3 <77.

Preferably, 1.5< (t34+t45)/(CT 4+ct 5) <1.7.

The focal power and the surface shape of each lens are reasonably restrained, so that smooth transition of light is facilitated, and meanwhile, the characteristics of large image surface and large aperture of the imaging lens group are guaranteed, and good imaging quality of the imaging lens group is guaranteed. At least 3 lenses of the first lens to the fifth lens are made of glass materials, so that good color edge expression can be realized by utilizing the characteristic of high Abbe number of the glass materials, and better imaging effect can be achieved. The Abbe number V1 of the first lens, the Abbe number V3 of the third lens and the Abbe number V5 of the fifth lens are reasonably constrained, so that the chromatic dispersion degree of the system is reasonably controlled, and the chromatic aberration correcting capability of the imaging lens group is improved, so that a better imaging effect is realized. The field curvature contribution of each view field of the imaging lens group is controlled to be within a reasonable range by restraining the relation among the air interval T34 of the third lens and the fourth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens, the generated field curvature of other lenses is balanced, and the resolution is effectively improved.

In this embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.3. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface is restrained, so that the ultrathin characteristic and the miniaturization characteristic of the imaging lens group are realized, and the imaging lens group can be applied to ultrathin electronic products.

In this embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.9< f 3/(f1+f4) <1.3. The conditional expression is satisfied, and the contribution of three lenses to the aberration of the whole optical system can be effectively restrained, so that the imaging quality of the imaging lens group is improved. Preferably, 1.0< f 3/(f1+f4) <1.2.

In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.1< f2/f5<2.6. The optical sensitivity of the second lens and the fifth lens can be effectively reduced by meeting the conditional expression, and the mass production is more facilitated. Preferably 2.3< f2/f5<2.5.

In the present embodiment, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the imaging side of the first lens, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the imaging side of the second lens satisfy: 0.8< (R1+R2)/(R3+R4) <1.2. The optical path deflection device meets the condition, so that the imaging lens group can better realize optical path deflection and can better balance the advanced spherical aberration generated by the imaging lens group. Preferably, 0.9< (r1+r2)/(r3+r4) <1.1.

In the present embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the imaging side surface of the third lens satisfy: 5.0< R5/R6<5.6. The on-axis aberration generated by the imaging lens group can be effectively balanced by meeting the conditional expression. Preferably, 5.2< R5/R6<5.5.

In the present embodiment, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the imaging side surface of the fourth lens satisfy: 1.6< (R7-R8)/(R7+R8) <2.2. The condition is satisfied, so that the imaging lens group can better realize light path deflection, and meanwhile, the fourth lens is guaranteed to have good machinability, and the sensitivity of the system is reduced. Preferably, 1.8< (R7-R8)/(R7 + R8) <2.2.

In the present embodiment, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the imaging side surface of the fifth lens satisfy: 3.2< R9/R10<4.2. The on-axis aberration generated by the imaging lens group can be effectively balanced by meeting the conditional expression. Preferably 3.4< R9/R10<4.0.

In the present embodiment, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 3.2< f 123/(c1+c2+c3) <3.8. The sensitivity of the front lenses can be reduced by meeting the conditional expression, and the yield is improved while the processability is ensured. Preferably, 3.4< f 123/(CT 1+ CT2+ CT 3) <3.7.

In the present embodiment, the on-axis distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens, the on-axis distance SAG42 between the intersection point of the imaging side surface of the fourth lens and the optical axis and the effective radius vertex of the imaging side surface of the fourth lens, 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: 2.8< f 45/(sag41+sag42+sag51+sag52) <3.4. The processing, forming and assembling of the fourth lens and the fifth lens are guaranteed to meet the condition, so that good imaging quality is obtained. The unreasonable ratio can cause difficult adjustment of molding surface type, easy deformation after assembly is obvious, and further the imaging quality can not be ensured. Preferably, 2.9< f 45/(sag41+sag42+sag51+sag52) <3.3.

In this embodiment, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, the edge thickness ET5 of the fifth lens and the edge thickness ET4 of the fourth lens satisfy: 1.2< (ET 4+ ET 5)/(ET 2+ ET 3) <1.6. The uniformity of lens shape transition and the reliability of subsequent molding assembly are reasonably controlled by controlling the edge thickness of the second lens to the fifth lens; meanwhile, the range of incident light rays can be reasonably limited, off-axis aberration is reduced, and the sensitivity of the system is reduced. Preferably, 1.3< (ET 4+ ET 5)/(ET 2+ ET 3) <1.5.

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

The imaging lens group in the present application may employ a plurality of lenses, such as the five lenses described above. Through the optical power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of the reasonable distribution, the aperture of the imaging lens group can be effectively increased, the sensitivity of the lens is reduced, and the processability of the lens is improved, so that the imaging lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like. The imaging lens group has the advantages of ultra-thin 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 aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, those skilled in the art will appreciate that the number of lenses making up an imaging lens set can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although described in the embodiment as a five-lens example, the imaging lens group is not limited to include five lenses. The imaging lens set may also include other numbers of lenses, if desired.

Examples of specific aspects and parameters applicable to the imaging lens set of the above embodiment are further described below with reference to the accompanying drawings.

It should be noted that any 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 group according to an example one of the present application is described. Fig. 1 shows a schematic view of an imaging lens group structure of example one.

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

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

In this example, the total effective focal length f of the imaging lens group is 5.58mm, the total length TTL of the imaging lens group is 6.53mm and the image height ImgH is 5.29mm.

Table 1 shows a basic structural parameter table for the imaging lens set of example one, in which the radius of curvature, thickness/distance are all in millimeters (mm).

TABLE 1

In example one, the object side and the imaging side of any one of the first lens E1 to the fifth lens E5 are aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients 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-S10 in example one.

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve for an imaging lens set of example one, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 3 shows an astigmatic curve of an imaging lens set of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4 shows a distortion curve for an imaging lens set of example one, which represents distortion magnitude values corresponding to different field angles. Fig. 5 shows a chromatic aberration of magnification curve of an imaging lens set of example one, which represents the deviation of different image heights on an imaging plane after light passes through the imaging lens set.

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

Example two

As shown in fig. 6 to 10, an imaging lens set of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the imaging lens set structure of example two.

As shown in fig. 6, the imaging lens group sequentially includes, from an object side to an imaging side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, optical filter E6 and imaging surface S13.

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

In this example, the total effective focal length f of the imaging lens group is 5.57mm, the total length TTL of the imaging lens group is 6.47mm and the image height ImgH is 5.30mm.

Table 3 shows a basic structural parameter table for the imaging lens set of example two, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

TABLE 4 Table 4

FIG. 7 shows an on-axis chromatic aberration curve for an imaging lens set of example two, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 8 shows the astigmatism curves of the imaging lens group of example two, which represent meridional image plane curvature and sagittal image plane curvature. Fig. 9 shows a distortion curve for the imaging lens set of example two, which represents distortion magnitude values corresponding to different field angles. Fig. 10 shows a chromatic aberration of magnification curve of an imaging lens set of example two, which represents the deviation of different image heights on an imaging plane after light passes through the imaging lens set.

As can be seen from fig. 7 to fig. 10, the imaging lens set provided in example two can achieve good imaging quality.

Example three

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

As shown in fig. 11, the imaging lens group sequentially includes, from an object side to an imaging side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, optical filter E6 and imaging surface S13.

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

In this example, the total effective focal length f of the imaging lens group is 5.56mm, the total length TTL of the imaging lens group is 6.47mm and the image height ImgH is 5.34mm.

Table 5 shows a basic structural parameter table for the imaging lens set of example three, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.7205E-03

1.7058E-02

-5.2335E-02

1.0184E-01

-1.2431E-01

9.5529E-02

-4.4809E-02

S2

-2.2320E-02

6.4799E-03

5.3421E-02

-1.4966E-01

2.1326E-01

-1.8031E-01

8.9875E-02

S3

-4.9921E-02

5.3009E-02

-2.0428E-02

-5.8938E-03

1.2924E-02

-5.0589E-03

-2.0051E-03

S4

-3.4870E-02

6.1309E-02

-9.3861E-02

2.3423E-01

-4.3582E-01

5.0559E-01

-3.4856E-01

S5

-5.2261E-02

1.5007E-02

-5.3360E-02

7.6304E-02

-5.5077E-02

-6.4869E-03

3.9090E-02

S6

-3.5733E-02

-5.7050E-03

1.1978E-02

-2.9750E-02

3.6790E-02

-2.7352E-02

1.2441E-02

S7

-9.7062E-03

4.6218E-03

-1.2921E-02

1.8614E-02

-1.7645E-02

1.0393E-02

-3.9043E-03

S8

-1.4114E-02

-3.0031E-04

1.1062E-02

-1.2180E-02

6.4815E-03

-2.1335E-03

4.7086E-04

S9

-2.1140E-01

6.9932E-02

7.1492E-03

-2.0897E-02

1.1156E-02

-3.3487E-03

6.5649E-04

S10

-2.3297E-01

1.3113E-01

-5.9003E-02

2.0278E-02

-5.2670E-03

1.0303E-03

-1.5127E-04

Face number

A18

A20

A22

A24

A26

A28

A30

S1

1.1696E-02

-1.3035E-03

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S2

-2.4287E-02

2.7281E-03

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S3

2.3223E-03

-5.6549E-04

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S4

1.3110E-01

-2.0664E-02

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S5

-2.5022E-02

5.4437E-03

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S6

-3.2316E-03

3.8064E-04

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S7

9.4717E-04

-1.4611E-04

1.3516E-05

-6.3178E-07

5.2017E-09

4.5100E-10

0.0000E+00

S8

-7.0747E-05

7.0708E-06

-4.3793E-07

1.3711E-08

-2.8428E-11

-7.2101E-12

0.0000E+00

S9

-8.8884E-05

8.4989E-06

-5.7453E-07

2.6931E-08

-8.3418E-10

1.5376E-11

-1.2782E-13

S10

1.6586E-05

-1.3457E-06

7.9463E-08

-3.3148E-09

9.2528E-11

-1.5507E-12

1.1802E-14

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve for the imaging lens set of example three, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 13 shows an astigmatism curve of the imaging lens group of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14 shows a distortion curve for the imaging lens set of example three, which represents distortion magnitude values for different field angles. Fig. 15 shows a chromatic aberration of magnification curve for an imaging lens set of example three, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens set.

As can be seen from fig. 12 to 15, the imaging lens set given in example three can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an imaging lens group of example four of the present application is described. Fig. 16 shows a schematic view of the structure of an imaging lens set of example four.

As shown in fig. 16, the imaging lens group sequentially includes, from an object side to an imaging side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, optical filter E6 and imaging surface S13.

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

In this example, the total effective focal length f of the imaging lens group is 5.56mm, the total length TTL of the imaging lens group is 6.48mm and the image height ImgH is 5.23mm.

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

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve for the imaging lens set of example four, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 18 shows an astigmatism curve of the imaging lens group of example four, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 19 shows a distortion curve of the imaging lens group of example four, which represents distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve for an imaging lens set of example four, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens set.

As can be seen from fig. 17 to 20, the imaging lens set provided in example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an imaging lens group of example five of the present application is described. Fig. 21 shows a schematic diagram of an imaging lens set configuration of example five.

As shown in fig. 21, the imaging lens group sequentially includes, from an object side to an imaging side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, optical filter E6 and imaging surface S13.

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

In this example, the total effective focal length f of the imaging lens group is 5.56mm, the total length TTL of the imaging lens group is 6.48mm and the image height ImgH is 5.10mm.

Table 9 shows a basic structural parameter table for the imaging lens set of example five, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Table 10

Fig. 22 shows an on-axis chromatic aberration curve for the imaging lens set of example five, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 23 shows an astigmatism curve of the imaging lens group of example five, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the imaging lens group of example five, which represents distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve for the imaging lens set of example five, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens set.

As can be seen from fig. 22 to 25, the imaging lens set provided in example five can achieve good imaging quality.

In summary, examples one to five satisfy the relationships shown in table 11, respectively.

Condition/example	1	2	3	4	5
						TTL/ImgH	1.23	1.22	1.21	1.24	1.27
(V1+V3+V5)/3	75.67	76.30	74.33	75.39	74.81
						f3/(f1+f4)	1.08	1.12	1.16	1.15	1.17
f2/f5	2.37	2.38	2.39	2.31	2.32
						(R1+R2)/(R3+R4)	1.00	0.95	0.93	0.92	0.95
R5/R6	5.38	5.47	5.25	5.42	5.45
						(R7-R8)/(R7+R8)	1.90	1.91	2.00	2.10	1.88
R9/R10	3.95	3.79	3.63	3.45	3.63
						f123/(CT1+CT2+CT3)	3.42	3.52	3.59	3.60	3.59
f45/(SAG41+SAG42+SAG51+SAG52)	2.96	2.97	3.07	3.24	3.23
						(T34+T45)/(CT4+CT5)	1.59	1.68	1.65	1.64	1.64
(ET4+ET5)/(ET2+ET3)	1.40	1.41	1.45	1.47	1.45

Table 11 table 12 gives the effective focal lengths f of the imaging lens groups of examples one to five, the effective focal lengths f1 to f5 of the respective lenses.

Parameters/examples	1	2	3	4	5
						f1(mm)	4.86	4.85	4.88	4.87	4.87
f2(mm)	-9.17	-9.22	-9.41	-9.38	-9.35
						f3(mm)	14.17	14.67	15.23	15.40	15.56
f4(mm)	8.27	8.23	8.28	8.50	8.40
						f5(mm)	-3.87	-3.87	-3.93	-4.06	-4.04
f(mm)	5.58	5.57	5.56	5.56	5.56
						TTL(mm)	6.53	6.47	6.47	6.48	6.48
ImgH(mm)	5.29	5.30	5.34	5.23	5.10

Table 12

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

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated 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 the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (9)

1. An imaging lens set, comprising, in order from an object side to an imaging side:

a first lens having positive optical power, the object side of which is convex, and the imaging side of which is concave;

a second lens having negative optical power, the object side of which is convex and the imaging side of which is concave;

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

A fourth lens having positive optical power, the object side of which is convex, and the imaging side of which is convex;

a fifth lens having negative optical power, the object side of which is convex, and the imaging side of which is concave;

the imaging lens group is composed of the first lens to the fifth lens;

and at least 3 lenses of the first lens to the fifth lens are made of glass material,

the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.3; the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens satisfy: 70< (v1+v3+v5)/3 <85;

the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 0.9< f 3/(f1+f4) <1.3; the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 2.1< f2/f5<2.6.

2. The imaging lens set of claim 1, wherein a radius of curvature R1 of an object side of the first lens, a radius of curvature R2 of an imaging side of the first lens, a radius of curvature R3 of an object side of the second lens, and a radius of curvature R4 of an imaging side of the second lens satisfy: 0.8< (R1+R2)/(R3+R4) <1.2.

3. The imaging lens set of claim 1, wherein a radius of curvature R5 of an object side of the third lens and a radius of curvature R6 of an imaging side of the third lens satisfy: 5.0< R5/R6<5.6.

4. The imaging lens set of claim 1, wherein a radius of curvature R7 of an object side of the fourth lens and a radius of curvature R8 of an imaging side of the fourth lens satisfy: 1.6< (R7-R8)/(R7+R8) <2.2.

5. The imaging lens set of claim 1, wherein a radius of curvature R9 of an object side of the fifth lens and a radius of curvature R10 of an imaging side of the fifth lens satisfy: 3.2< R9/R10<4.2.

6. The imaging lens set of claim 1, wherein a combined focal length f123 of the first lens, the second lens, the third lens, a center thickness CT1 of the first lens, a center thickness CT2 of the second lens, and a center thickness CT3 of the third lens satisfy: 3.2< f 123/(c1+c2+c3) <3.8.

7. The imaging lens set of claim 1, wherein an on-axis distance SAG41 between an intersection of an object side of the fourth lens and an optical axis to an effective radius vertex of the object side of the fourth lens, an on-axis distance SAG42 between an intersection of an imaging side of the fourth lens and an optical axis to an effective radius vertex of the imaging side of the fourth lens, an on-axis distance SAG51 between an intersection of an object side of the fifth lens and an optical axis to an effective radius vertex of the object side of the fifth lens and an effective radius vertex of the imaging side of the fifth lens and an on-axis distance SAG52 between an intersection of an imaging side of the fifth lens and an optical axis to an effective radius vertex of the imaging side of the fifth lens, is satisfied: 2.8< f 45/(sag41+sag42+sag51+sag52) <3.4.

8. The imaging lens set of claim 1, wherein an air separation T34 on an optical axis of the third lens and the fourth lens, an air separation T45 on the optical axis of the fourth lens and the fifth lens, a center thickness CT4 of the fourth lens and a center thickness CT5 of the fifth lens satisfy: 1.4< (T34+T45)/(Ct4+Ct5) <1.8.

9. The imaging lens set of claim 1, wherein between an edge thickness ET2 of the second lens, an edge thickness ET3 of the third lens, an edge thickness ET5 of the fifth lens, and an edge thickness ET4 of the fourth lens: 1.2< (ET 4+ ET 5)/(ET 2+ ET 3) <1.6.