CN216792562U

CN216792562U - Photographic lens group

Info

Publication number: CN216792562U
Application number: CN202220201554.8U
Authority: CN
Inventors: 何旦; 吕赛锋; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-06-21
Anticipated expiration: 2032-01-25

Abstract

The utility model provides a photographic lens group, which sequentially comprises the following components from the light inlet side of the photographic lens group to the light outlet side of the photographic lens group: the surface of the first lens close to the light-in side is in a convex shape, and the surface of the first lens close to the light-out side is in a concave shape; the second lens with positive refractive power is provided, and the surface of the second lens close to the light-emitting side is in a convex shape; the surface of the third lens close to the light inlet side is concave, and the surface of the third lens close to the light outlet side is concave; the fourth lens with positive refractive power is provided, and the surface of the fourth lens close to the light-emitting side is in a convex shape; the surface of the fifth lens close to the light-emitting side is in a concave shape; wherein, the on-axis distance TTL from the surface of the first lens close to the light incidence side to the imaging surface satisfies: 1.8mm < TTL <2.4 mm. The utility model solves the problem that the miniaturization and high image quality of the photographing lens group in the prior art are difficult to be considered simultaneously.

Description

Photographic lens group

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to a photographic lens group.

Background

Because the camera lens on the mobile terminal needs to be matched with the chip, and along with the upgrading and upgrading of the chip, the camera lens of the mobile terminal needs to be upgraded along with the chip so as to meet the requirement of faster modern work rhythm, the visual field has higher requirement on the portability of a computer, the camera lens is continuously developed towards flattening, and meanwhile, pixels need to be improved so as to meet the requirement of high image quality.

That is, the conventional photographing lens group has a problem that it is difficult to achieve both miniaturization and high image quality.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a photographic lens group to solve the problem that the miniaturization and high image quality of the photographic lens group in the prior art are difficult to achieve simultaneously.

In order to achieve the above object, according to one aspect of the present invention, there is provided a photographing lens group comprising, in order from an incident side of the photographing lens group to an emergent side of the photographing lens group: the surface of the first lens close to the light-in side is in a convex shape, and the surface of the first lens close to the light-out side is in a concave shape; the second lens with positive refractive power is provided, and the surface of the second lens close to the light-emitting side is in a convex shape; the surface of the third lens close to the light-in side is in a concave shape, and the surface of the third lens close to the light-out side is in a concave shape; the fourth lens with positive refractive power is provided, and the surface of the fourth lens close to the light-emitting side is in a convex shape; the surface of the fifth lens close to the light-emitting side is in a concave shape; wherein, the on-axis distance TTL from the surface of the first lens close to the light incidence side to the imaging surface satisfies: 1.8mm < TTL <2.4 mm.

Further, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy the following conditions: 0.5< f1/(f2+ f4) < 1.3.

Further, the effective focal length f5 of the fifth lens and the effective focal length f3 of the third lens satisfy: 0.2< f5/f3< 2.9.

Further, the curvature radius R1 of the surface of the first lens close to the light inlet side and the curvature radius R2 of the surface of the first lens close to the light outlet side satisfy that: 2.4< R2/R1< 3.5.

Further, the effective focal length f of the photographing lens group, the curvature radius R4 of the surface of the second lens close to the light-in side and the curvature radius R8 of the surface of the fourth lens close to the light-out side satisfy: -1.3< f/(R4+ R8) < -0.7.

Further, the curvature radius R5 of the surface of the third lens close to the light inlet side and the curvature radius R6 of the surface of the third lens close to the light outlet side satisfy that: 0.1< (R6+ R5)/(R6-R5) < 0.8.

Further, the curvature radius R10 of the surface of the fifth lens close to the light-emitting side and the central thickness CT5 of the fifth lens satisfy that: 1.4< R10/CT5< 4.0.

Further, the combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy the following conditions: 0< (f23+ f45)/(f23-f45) < 0.7.

Further, an on-axis distance SAG22 from an intersection point of a surface of the second lens close to the light exit side and the optical axis of the photographing lens group to an effective radius vertex of the surface of the second lens close to the light exit side, an on-axis distance SAG31 from an intersection point of a surface of the third lens close to the light entrance side and the optical axis to an effective radius vertex of a surface of the third lens close to the light entrance side, and an on-axis distance SAG42 from an intersection point of a surface of the fourth lens close to the light exit side and the optical axis to an effective radius vertex of a surface of the fourth lens close to the light exit side satisfy: 0.6< (SAG22+ SAG31)/SAG42< 1.3.

Further, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 2.8< CT2/ET2+ ET3/CT3< 3.6.

Further, the edge thickness ET5 of the fifth lens and the edge thickness ET4 of the fourth lens satisfy: 1.0< ET5/ET4< 2.8.

According to another aspect of the present invention, there is provided a photographing lens group, comprising in order from a light-in side of the photographing lens group to a light-out side of the photographing lens group: the first lens with positive refractive power is provided, the surface of the first lens close to the light inlet side is in a convex shape, and the surface of the first lens close to the light outlet side is in a concave shape; the second lens with positive refractive power is provided, and the surface of the second lens close to the light-emitting side is in a convex shape; the surface of the third lens close to the light-in side is in a concave shape, and the surface of the third lens close to the light-out side is in a concave shape; the fourth lens with positive refractive power is provided, and the surface of the fourth lens close to the light-emitting side is in a convex shape; the surface of the fifth lens close to the light-emitting side is in a concave shape; the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy the following conditions: 0.5< f1/(f2+ f4) < 1.3.

Further, the combined focal length f23 of the second and third lenses and the combined focal length f45 of the fourth and fifth lenses satisfy the following condition: 0< (f23+ f45)/(f23-f45) < 0.7.

By applying the technical scheme of the utility model, the photographing lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the light-in side to the light-out side, wherein the first lens has positive refractive power, the surface of the first lens close to the light-in side is in a convex shape, and the surface of the first lens close to the light-out side is in a concave shape; the second lens has positive refractive power, and the surface of the second lens close to the light-emitting side is in a convex shape; the third lens has negative refractive power, the surface of the third lens close to the light-in side is in a concave shape, and the surface of the third lens close to the light-out side is in a concave shape; the fourth lens has positive refractive power, and the surface of the fourth lens close to the light-emitting side is in a convex shape; the fifth lens has negative refractive power, and the surface of the fifth lens close to the light-emitting side is in a concave shape; wherein, the on-axis distance TTL from the surface of the first lens close to the light incidence side to the imaging surface satisfies: 1.8mm < TTL <2.4 mm. Through the positive and negative distribution of the refractive power of each lens of the photographing lens group, the low-order aberration of the photographing lens group can be effectively balanced, meanwhile, the tolerance sensitivity of the photographing lens group can be reduced, the miniaturization of the photographing lens group is kept, and meanwhile, the imaging quality of the photographing lens group is guaranteed. Positive refracting power is set to first lens and second lens, can effectively assemble light, and third lens and fifth lens are negative refracting power, can ensure that the system maintains great image plane, adopt the combination of positive and negative refracting power, can effectively reduce photographic lens group's aberration, promote imaging quality, can avoid the great deflection to appear in the light path simultaneously, and positive and negative refracting power staggers the distribution, avoids the refracting power to lead to local lens's shape strange and different too much, is difficult to process. Through restricting TTL at reasonable within range, fine restriction the total length of photographic lens group, be favorable to the miniaturization of module simultaneously to the more frivolous mobile terminal of adaptation.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic view showing a configuration of a photographing lens group according to a first example of the present invention;

fig. 2 to 3 show an on-axis chromatic aberration curve and a distortion curve of the photographing lens group in fig. 1, respectively;

fig. 4 is a schematic view showing a configuration of a photographing lens group according to a second example of the present invention;

fig. 5 to 6 show an on-axis chromatic aberration curve and a distortion curve of the photographing lens group in fig. 4, respectively;

fig. 7 is a schematic view showing a configuration of a photographing lens group according to a third example of the present invention;

fig. 8 to 9 show an on-axis chromatic aberration curve and a distortion curve of the photographing lens group in fig. 7, respectively;

fig. 10 is a schematic view showing a configuration of a photographing lens group of example four of the present invention;

fig. 11 to 12 show an on-axis chromatic aberration curve and a distortion curve of the photographing lens group in fig. 10, respectively;

fig. 13 is a schematic view showing a configuration of a photographing lens group of example five of the present invention;

fig. 14 to 15 show an on-axis chromatic aberration curve and a distortion curve of the photographing lens group in fig. 13, respectively;

fig. 16 is a schematic view showing a configuration of a photographing lens group of example six of the present invention;

fig. 17 to 18 show an on-axis chromatic aberration curve and a distortion curve of the photographing lens group in fig. 16, respectively;

wherein the figures include the following reference numerals:

STO, diaphragm; e1, first lens; s1, the surface of the first lens close to the light incidence side; s2, the surface of the first lens close to the light-emitting side; e2, second lens; s3, the surface of the second lens close to the light incidence side; s4, the surface of the second lens close to the light-emitting side; e3, third lens; s5, the surface of the third lens close to the light incidence side; s6, the surface of the third lens close to the light-emitting side; e4, fourth lens; s7, the surface of the fourth lens close to the light incidence side; s8, the surface of the fourth lens close to the light-emitting side; e5, fifth lens; s9, the surface of the fifth lens close to the light incident side; s10, the surface of the fifth lens close to the light-emitting side; e6, a filter plate; s11, the surface of the filter close to the light incident side; s12, enabling the filter to be close to the surface of the light emergent side; and S13, 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 invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the utility model.

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. For the surface close to the light incident side, the shape is determined to be convex when the R value is positive, and the shape is determined to be concave when the R value is negative; the surface closer to the light exit side is determined to be concave when the R value is positive, and convex when the R value is negative.

The utility model provides a photographic lens group, aiming at solving the problem that the miniaturization and high image quality of the photographic lens group in the prior art are difficult to be considered.

Example one

As shown in fig. 1 to 18, the photographing lens assembly includes, in order from the light incident side of the photographing lens assembly to the light exiting side of the photographing lens assembly, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, the first lens has positive refractive power, a surface of the first lens near the light incident side is convex, and a surface of the first lens near the light exiting side is concave; the second lens has positive refractive power, and the surface of the second lens close to the light-emitting side is in a convex shape; the third lens has negative refractive power, the surface of the third lens close to the light-in side is in a concave shape, and the surface of the third lens close to the light-out side is in a concave shape; the fourth lens has positive refractive power, and the surface of the fourth lens close to the light-emitting side is in a convex shape; the fifth lens has negative refractive power, and the surface of the fifth lens close to the light-emitting side is in a concave shape; wherein, the on-axis distance TTL from the surface of the first lens close to the light incidence side to the imaging surface satisfies: 1.8mm < TTL <2.4 mm. Through the positive and negative distribution of the refractive power of each lens of the photographing lens group, the low-order aberration of the photographing lens group can be effectively balanced, meanwhile, the tolerance sensitivity of the photographing lens group can be reduced, the miniaturization of the photographing lens group is kept, and meanwhile, the imaging quality of the photographing lens group is guaranteed. Positive refractive power is set to first lens and second lens, can effectively assemble light, and third lens and fifth lens are negative refractive power, can ensure that the system maintains great image planes, adopt the combination of positive and negative refractive power, can effectively reduce photographic lens group's aberration, promote imaging quality, can avoid great deflection to appear in the light path simultaneously, and positive and negative refractive power distribution of staggering avoids refractive power to lead to local lens's shape strange and different too much in concentration, is difficult to process. Through restricting TTL at reasonable within range, fine restriction the total length of photographic lens group, be favorable to the miniaturization of module simultaneously to the more frivolous mobile terminal of adaptation.

Preferably, the on-axis distance TTL from the surface of the first lens near the light entrance side to the imaging surface satisfies: 1.9mm < TTL <2.3 mm.

In the present embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens satisfy: 0.5< f1/(f2+ f4) < 1.3. By limiting f1/(f2+ f4) within a reasonable range, it is advantageous to compress the overall length of the photographing lens group, achieve miniaturization of the module, and avoid the problem of increased tolerance sensitivity of the photographing lens group caused by excessive concentration of refractive power. Preferably, 0.6< f1/(f2+ f4) < 1.1.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f3 of the third lens satisfy: 0.2< f5/f3< 2.9. By controlling f5/f3 within a reasonable range, the imaging quality can be improved by reasonably distributing the refractive power, and meanwhile, the sensitivity of the manufacturing error of the product can be reduced by reducing the refractive power of the third lens. Preferably 0.3< f5/f3< 2.8.

In the present embodiment, the radius of curvature R1 of the surface of the first lens on the light incident side and the radius of curvature R2 of the surface of the first lens on the light exit side satisfy: 2.4< R2/R1< 3.5. By limiting R2/R1 within a reasonable range, the deflection angle of marginal rays at the first lens can be reasonably controlled, and the sensitivity of the photographing lens group can be effectively reduced. Preferably 2.5< R2/R1< 3.45.

In the present embodiment, the effective focal length f of the photographing lens group, the radius of curvature R4 of the surface of the second lens on the light incident side, and the radius of curvature R8 of the surface of the fourth lens on the light exit side satisfy: -1.3< f/(R4+ R8) < -0.7. By controlling f/(R4+ R8) within a reasonable range, the photographing lens group can be ensured to have a larger angle of view by reasonably controlling the conditions, marginal rays can be ensured to have a reasonable deflection angle at the fourth lens, and the sensitivity of the photographing lens group is reduced. Preferably, -1.1< f/(R4+ R8) < -0.8.

In the embodiment, the radius of curvature R5 of the surface of the third lens close to the light incident side and the radius of curvature R6 of the surface of the third lens close to the light emergent side satisfy: 0.1< (R6+ R5)/(R6-R5) < 0.8. By controlling the ratio of the sum of the curvature radius of the surface of the third lens close to the light inlet side and the curvature radius of the surface of the third lens close to the light outlet side to the difference within a certain range, the deflection angle of the light at the edge of the photographic lens group can be reasonably controlled, and the sensitivity of the photographic lens group is effectively reduced. Preferably, 0.3< (R6+ R5)/(R6-R5) < 0.7.

In the present embodiment, the radius of curvature R10 of the surface of the fifth lens near the light exit side and the center thickness CT5 of the fifth lens satisfy: 1.4< R10/CT5< 4.0. By controlling R10/CT5 within a reasonable range, the workability of the fifth lens can be ensured while the sensitivity of the fifth lens is reduced. Preferably, 1.5< R10/CT5< 3.9.

In the present embodiment, a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 0< (f23+ f45)/(f23-f45) < 0.7. By reasonably controlling the sum-difference ratio of the combined focal length of the second lens and the third lens and the combined focal length of the fourth lens and the fifth lens, the contribution of the aberration of the two groups of lenses can be controlled to balance the aberration generated by the front end optical element, so that the aberration of the photographing lens group is in a reasonable horizontal state. Preferably, 0.05< (f23+ f45)/(f23-f45) < 0.6.

In this embodiment, the on-axis distance SAG22 between the intersection point of the optical axis of the photographing lens group and the surface of the second lens on the light exit side to the effective radius vertex of the surface of the second lens on the light exit side, the on-axis distance SAG31 between the intersection point of the surface of the third lens on the light entrance side and the optical axis to the effective radius vertex of the surface of the third lens on the light entrance side, and the on-axis distance SAG42 between the intersection point of the surface of the fourth lens on the light exit side and the optical axis to the effective radius vertex of the surface of the fourth lens on the light exit side satisfy: 0.6< (SAG22+ SAG31)/SAG42< 1.3. By controlling (SAG22+ SAG31)/SAG42 within a reasonable range, the relationship between the miniaturization of the module and the relative illumination of the off-axis field of view is favorably realized in a better balance mode. Preferably, 0.7< (SAG22+ SAG31)/SAG42< 1.2.

In the present embodiment, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the edge thickness ET2 of the second lens, and the edge thickness ET3 of the third lens satisfy: 2.8< CT2/ET2+ ET3/CT3< 3.6. By controlling the CT2/ET2+ ET3/CT3 in a reasonable range, the processing manufacturability of the second lens and the third lens is improved, and the molding manufacturing difficulty is reduced. Preferably, 3< CT2/ET2+ ET3/CT3< 3.5.

In the present embodiment, the edge thickness ET5 of the fifth lens and the edge thickness ET4 of the fourth lens satisfy: 1.0< ET5/ET4< 2.8. By limiting ET5/ET4 within a reasonable range, the edge structure of the photographing lens group can be effectively controlled, the photographing lens group can have a more compact structure, and the miniaturization of the photographing lens group is facilitated. Preferably, 1.05< ET5/ET4< 2.7.

Example two

As shown in fig. 1 to 18, the photographing lens assembly includes, in order from the light incident side of the photographing lens assembly to the light exiting side of the photographing lens assembly, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, the first lens has positive refractive power, a surface of the first lens near the light incident side is convex, and a surface of the first lens near the light exiting side is concave; the second lens has positive refractive power, and the surface of the second lens close to the light-emitting side is in a convex shape; the third lens has negative refractive power, the surface of the third lens close to the light-in side is in a concave shape, and the surface of the third lens close to the light-out side is in a concave shape; the fourth lens has positive refractive power, and the surface of the fourth lens close to the light-emitting side is in a convex shape; the fifth lens has negative refractive power, and the surface of the fifth lens close to the light-emitting side is in a concave shape; the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy the following conditions: 0.5< f1/(f2+ f4) < 1.3.

Through the positive and negative distribution of the refractive power of each lens of the photographing lens group, the low-order aberration of the photographing lens group can be effectively balanced, meanwhile, the tolerance sensitivity of the photographing lens group can be reduced, the miniaturization of the photographing lens group is kept, and meanwhile, the imaging quality of the photographing lens group is guaranteed. Positive refracting power is set to first lens and second lens, can effectively assemble light, and third lens and fifth lens are negative refracting power, can ensure that the system maintains great image plane, adopt the combination of positive and negative refracting power, can effectively reduce photographic lens group's aberration, promote imaging quality, can avoid the great deflection to appear in the light path simultaneously, and positive and negative refracting power staggers the distribution, avoids the refracting power to lead to local lens's shape strange and different too much, is difficult to process. By limiting f1/(f2+ f4) within a reasonable range, it is advantageous to compress the overall length of the photographing lens group, achieve miniaturization of the module, and avoid the problem of increased tolerance sensitivity of the photographing lens group caused by excessive concentration of refractive power.

Preferably, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy the following conditions: 0.6< f1/(f2+ f4) < 1.1.

In the present embodiment, the radius of curvature R1 of the surface of the first lens on the light incident side and the radius of curvature R2 of the surface of the first lens on the light exit side satisfy: 2.4< R2/R1< 3.5. By limiting R2/R1 within a reasonable range, the deflection angle of marginal rays at the first lens can be reasonably controlled, and the sensitivity of the photographing lens group can be effectively reduced. Preferably 2.5< R2/R1< 3.45. In the present embodiment, the effective focal length f of the photographing lens group, the radius of curvature R4 of the surface of the second lens on the light incident side, and the radius of curvature R8 of the surface of the fourth lens on the light exit side satisfy: -1.3< f/(R4+ R8) < -0.7. By controlling f/(R4+ R8) within a reasonable range, the photographing lens group can be ensured to have a larger angle of view by reasonably controlling the conditions, marginal rays can be ensured to have a reasonable deflection angle at the fourth lens, and the sensitivity of the photographing lens group is reduced. Preferably, -1.1< f/(R4+ R8) < -0.8.

In the present embodiment, a curvature radius R5 of a surface of the third lens on the light incident side and a curvature radius R6 of a surface of the third lens on the light exit side satisfy: 0.1< (R6+ R5)/(R6-R5) < 0.8. By controlling the ratio of the sum of the curvature radius of the surface of the third lens close to the light inlet side and the curvature radius of the surface of the third lens close to the light outlet side to the difference within a certain range, the deflection angle of the light at the edge of the photographic lens group can be reasonably controlled, and the sensitivity of the photographic lens group is effectively reduced. Preferably, 0.3< (R6+ R5)/(R6-R5) < 0.7.

In this embodiment, a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 0< (f23+ f45)/(f23-f45) < 0.7. By reasonably controlling the sum-difference ratio of the combined focal length of the second lens and the third lens and the combined focal length of the fourth lens and the fifth lens, the contribution of the aberration of the two groups of lenses can be controlled to balance the aberration generated by the front end optical element, so that the aberration of the photographing lens group is in a reasonable horizontal state. Preferably, 0.05< (f23+ f45)/(f23-f45) < 0.6.

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

The photographing lens group in the present application may employ a plurality of lenses, for example, the above-mentioned five lenses. By reasonably distributing the refractive power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the photographing lens group can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the photographing lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses constituting a photographing lens group may be varied without departing from the technical solutions claimed in the present application to obtain the respective results and advantages described in the present specification. For example, although five lenses are exemplified in the embodiment, the photographing lens group is not limited to include five lenses. The photographing lens group may further include other numbers of lenses, if necessary.

Examples of specific surface types, parameters applicable to the imaging system of the above embodiment are further described below with reference to the drawings.

It should be noted that any one of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 3, a photographing lens group of the first example of the present application is described. Fig. 1 shows a schematic view of a photographing lens group structure of example one.

As shown in fig. 1, the photographing lens assembly, in order from an object side to an image side, comprises: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and image plane S13.

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

In this example, the total effective focal length f of the photographing lens group is 1.36mm, the total length TTL of the photographing lens group is 2.02mm, and the image height ImgH is 1.55 mm.

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

TABLE 1

In the first example, a surface of any one of the first lens E1 to the fifth lens E5 close to the light incident side and a surface close to the light emergent side are both aspheric surfaces, and the surface shape of each aspheric surface lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the 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-S10 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-3.6242E-01

4.2661E+00

-1.9409E+02

3.3669E+03

-3.5943E+04

2.0111E+05

-4.7592E+05

S2

-4.9543E-01

-4.6986E+00

-2.2237E+01

1.9473E+01

1.4497E+02

-1.3199E+04

7.5224E+04

S3

-1.0095E+00

-4.4503E+00

-2.5308E+02

5.5120E+03

-6.5388E+04

3.7118E+05

-7.4739E+05

S4

-7.1038E+00

7.8792E+01

-9.0216E+02

8.2480E+03

-5.4565E+04

2.1498E+05

-3.4818E+05

S5

-4.5535E+00

1.8546E+00

4.1032E+02

-4.2397E+03

1.8513E+04

-3.0720E+04

-1.7179E+03

S6

-1.1625E+00

-3.9799E+00

9.7881E+01

-6.9444E+02

2.5451E+03

-5.1904E+03

4.8301E+03

S7

5.6433E-01

4.0408E+00

-1.9930E+02

2.4259E+03

-1.6859E+04

7.1831E+04

-1.8462E+05

S8

5.3579E-01

1.1240E+01

-1.4979E+02

1.0259E+03

-4.4070E+03

1.1913E+04

-1.9365E+04

S9

7.7025E-01

-3.6100E+01

4.5281E+02

-3.7283E+03

2.1250E+04

-8.5682E+04

2.4792E+05

S10

-7.4089E+00

4.6004E+01

-2.5339E+02

1.0736E+03

-3.3874E+03

7.9193E+03

-1.3723E+04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

0.0000E+00

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

2.6150E+05

-1.5593E+05

0.0000E+00

S8

1.7207E+04

-6.4229E+03

0.0000E+00

S9

-5.1856E+05

7.8361E+05

-8.4631E+05

6.3654E+05

-3.1659E+05

9.3571E+04

-1.2441E+04

S10

1.7591E+04

-1.6555E+04

1.1256E+04

-5.3673E+03

1.6994E+03

-3.2048E+02

2.7217E+01

TABLE 2

Fig. 2 shows on-axis chromatic aberration curves of the photographing lens group of example one, which represent convergent focus deviations of light rays of different wavelengths after passing through the photographing lens group. Fig. 3 shows distortion curves of the photographing lens group of example one, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 2 and 3, the photographing lens group given as example one can achieve good imaging quality.

Example two

As shown in fig. 4 to 6, a photographic lens group of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 4 shows a schematic diagram of a photographing lens group structure of example two.

As shown in fig. 4, the photographing lens assembly includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and image plane S13.

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

In this example, the total effective focal length f of the photographing lens group is 1.41mm, the total length TTL of the photographing lens group is 2.02mm, and the image height ImgH is 1.55 mm.

Table 3 shows a basic structural parameter table of the photographing lens group of example two, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.

TABLE 4

Fig. 5 shows on-axis chromatic aberration curves of the photographing lens group of example two, which represent the deviation of the convergent focus of light rays of different wavelengths after passing through the photographing lens group. Fig. 6 shows distortion curves of the photographing lens group of example two, which indicate distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 5 and 6, the photographing lens group given in example two can achieve good imaging quality.

Example III

As shown in fig. 7 to 9, a photographic lens group of example three of the present application is described. Fig. 7 shows a schematic diagram of a photographic lens group structure of example three.

As shown in fig. 7, the photographing lens assembly, in order from an object side to an image side, comprises: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and image plane S13.

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

In this example, the total effective focal length f of the photographing lens group is 1.36mm, the total length TTL of the photographing lens group is 2.00mm, and the image height ImgH is 1.55 mm.

Table 5 shows a basic structural parameter table of the photographing lens group of example three, in which the units of the radius of curvature, thickness/distance, and focal length are 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.

TABLE 6

Fig. 8 shows on-axis chromatic aberration curves of the photographing lens group of example three, which represent the convergent focus deviations of light rays of different wavelengths after passing through the photographing lens group. Fig. 9 shows distortion curves of the photographing lens group of example three, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 8 and 9, the photographing lens group given in example three can achieve good imaging quality.

Example four

As shown in fig. 10 to 12, a photographing lens group of example four of the present application is described. Fig. 10 shows a schematic diagram of a photographing lens group structure of example four.

As shown in fig. 10, the photographing lens assembly, in order from an object side to an image side, comprises: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and image plane S13.

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

In this example, the total effective focal length f of the photographing lens group is 1.48mm, the total length TTL of the photographing lens group is 2.03mm, and the image height ImgH is 1.55 mm.

Table 7 shows a basic structural parameter table of the photographing lens group of example four, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-3.6135E-01

3.1353E+00

-1.1475E+02

1.6234E+03

-1.3944E+04

6.2013E+04

-1.1670E+05

S2

-4.6209E-01

-6.5718E+00

1.1298E+02

-2.2609E+03

2.1904E+04

-1.1302E+05

2.3834E+05

S3

-7.6661E-01

-6.5864E+00

4.0794E+01

-6.2356E+02

4.6552E+03

-2.4023E+04

6.7614E+04

S4

-5.5581E+00

6.0294E+01

-5.2863E+02

2.4383E+03

-5.3975E+03

3.0751E+03

2.8532E+03

S5

-6.3949E+00

7.4934E+01

-7.1804E+02

4.6219E+03

-2.1142E+04

6.3543E+04

-9.4090E+04

S6

-2.6174E+00

1.6491E+01

-6.9687E+01

4.0220E+01

8.7254E+02

-3.3514E+03

4.0980E+03

S7

-2.7842E-01

-2.4797E+00

6.3130E+01

-5.9699E+02

3.3684E+03

-1.2350E+04

2.8277E+04

S8

2.6763E+00

-2.3280E+01

1.7387E+02

-7.9541E+02

2.2140E+03

-3.7685E+03

3.8199E+03

S9

-3.0102E+00

1.6273E+01

-1.2525E+02

1.2143E+03

-8.2790E+03

3.5667E+04

-1.0075E+05

S10

-6.4345E+00

4.2813E+01

-2.4387E+02

1.0762E+03

-3.5413E+03

8.5440E+03

-1.5070E+04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

0.0000E+00

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

-3.6471E+04

2.0027E+04

0.0000E+00

S8

-2.1146E+03

4.9165E+02

0.0000E+00

S9

1.9416E+05

-2.6119E+05

2.4624E+05

-1.6000E+05

6.8427E+04

-1.7365E+04

1.9831E+03

S10

1.9439E+04

-1.8276E+04

1.2369E+04

-5.8667E+03

1.8500E+03

-3.4829E+02

2.9616E+01

TABLE 8

Fig. 11 shows on-axis chromatic aberration curves of the photographing lens group of example four, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the photographing lens group. Fig. 12 shows distortion curves of the photographing lens group of example four, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 11 and 12, the photographing lens group given in example four can achieve good imaging quality.

Example five

As shown in fig. 13 to 15, a photographic lens group of example five of the present application is described. Fig. 13 shows a schematic diagram of a photographic lens group structure of example five.

As shown in fig. 13, the photographing lens assembly, in order from an object side to an image side, comprises: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and image plane S13.

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

In this example, the total effective focal length f of the photographing lens group is 1.36mm, the total length TTL of the photographing lens group is 2.20mm, and the image height ImgH is 1.55 mm.

Table 9 shows a basic structural parameter table of the photographing lens group of example five in which the units of the radius of curvature, thickness/distance, and focal length are all 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. 14 shows on-axis chromatic aberration curves of the photographing lens group of example five, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the photographing lens group. Fig. 15 shows distortion curves of the photographing lens group of example five, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 14 and 15, the photographing lens group given in example five can achieve good imaging quality.

Example six

As shown in fig. 16 to 18, a photographic lens group of example six of the present application is described. Fig. 16 shows a schematic diagram of a photographing lens group structure of example six.

As shown in fig. 16, the photographing lens assembly includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and image plane S13.

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

Table 11 shows a basic structural parameter table of the photographing lens group of example six in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, 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

-3.9686E-01

1.9187E+00

-1.2275E+02

2.1260E+03

-2.3805E+04

1.4044E+05

-3.5185E+05

S2

-9.2798E-01

-2.0137E+00

-1.9158E+02

3.4676E+03

-3.6047E+04

1.8823E+05

-3.8069E+05

S3

-1.2977E+00

-5.5273E+00

-2.6269E+02

4.5557E+03

-5.0617E+04

3.0665E+05

-6.7891E+05

S4

-8.1400E+00

1.0621E+02

-1.5834E+03

1.5875E+04

-9.1849E+04

2.8513E+05

-3.6208E+05

S5

-6.4424E+00

5.3168E+01

-6.8265E+02

8.3495E+03

-5.3269E+04

1.6193E+05

-1.8743E+05

S6

-1.0072E+00

-4.1114E+00

6.7552E+01

-3.6967E+02

1.1474E+03

-2.1731E+03

1.9632E+03

S7

2.7724E-01

6.5147E+00

-1.4118E+02

1.3231E+03

-7.7069E+03

2.8095E+04

-6.1708E+04

S8

1.4046E-01

1.1117E+01

-1.2446E+02

8.1533E+02

-3.3425E+03

8.3639E+03

-1.2264E+04

S9

2.4229E+00

-2.9031E+01

1.8419E+02

-8.1890E+02

2.6826E+03

-6.6090E+03

1.2283E+04

S10

-3.3506E+00

8.9053E+00

-2.2720E+01

5.9770E+01

-1.6078E+02

3.6826E+02

-6.3396E+02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

0.0000E+00

S2

0.0000E+00

S3

0.0000E+00

S4

0.0000E+00

S5

0.0000E+00

S6

0.0000E+00

S7

7.4709E+04

-3.8446E+04

0.0000E+00

S8

9.6615E+03

-3.1618E+03

0.0000E+00

S9

-1.7082E+04

1.7531E+04

-1.3011E+04

6.7671E+03

-2.3346E+03

4.7942E+02

-4.4346E+01

S10

7.8665E+02

-6.9431E+02

4.3035E+02

-1.8270E+02

5.0518E+01

-8.1893E+00

5.9009E-01

TABLE 12

Fig. 17 shows on-axis chromatic aberration curves of the photographing lens group of example six, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the photographing lens group. Fig. 18 shows distortion curves of the photographing lens group of example six, which represent values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 17 and 18, the photographing lens group given in example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditional formula/example	1	2	3	4	5	6
							TTL/tan(HFOV)(mm)	1.78	1.84	1.76	1.93	1.94	1.92
TTL(mm)	2.02	2.02	2.00	2.03	2.20	2.20
							f1/(f2+f4)	0.91	0.85	0.96	0.68	1.08	1.09
f5/f3	1.19	1.03	0.53	0.38	2.28	2.73
							R2/R1	2.75	2.82	2.88	3.39	2.64	3.36
f/(R4+R8)	-1.04	-1.04	-1.09	-0.96	-0.97	-1.05
							(R6+R5)/(R6-R5)	0.41	0.40	0.44	0.56	0.64	0.67
R10/CT5	1.65	1.79	2.42	3.76	1.66	1.61
							∑CT/∑AT	2.97	2.76	2.91	2.44	3.37	3.08
(f23+f45)/(f23-f45)	0.47	0.40	0.54	0.12	0.52	0.56
							(SAG22+SAG31)/SAG42	0.94	0.92	0.80	1.06	0.98	1.08
CT2/ET2+ET3/CT3	3.30	3.28	3.22	3.14	3.32	3.44
							ET5/ET4	2.44	2.33	2.14	1.10	1.89	2.63

Table 13 table 14 shows effective focal lengths f of the photographing lens groups of example one to example six, and effective focal lengths f1 to f5 of the respective lenses.

Example parameters	1	2	3	4	5	6
							f1(mm)	2.12	2.05	2.06	1.92	2.59	2.58
f2(mm)	1.29	1.37	1.43	2.03	1.27	1.11
							f3(mm)	-1.03	-1.09	-1.22	-1.64	-0.95	-0.90
f4(mm)	1.04	1.04	0.72	0.78	1.12	1.24
							f5(mm)	-1.23	-1.12	-0.65	-0.63	-2.16	-2.45
f(mm)	1.36	1.41	1.36	1.48	1.36	1.36
							TTL(mm)	2.02	2.02	2.00	2.03	2.20	2.20
ImgH(mm)	1.55	1.55	1.55	1.55	1.55	1.55

TABLE 14

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described photographing lens group.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings 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. A photographic lens assembly, comprising, in order from an incident side of the photographic lens assembly to an emergent side of the photographic lens assembly:

the surface of the first lens close to the light-in side is in a convex shape, and the surface of the first lens close to the light-out side is in a concave shape;

the second lens with positive refractive power is provided, and the surface of the second lens close to the light-emitting side is in a convex shape;

the surface of the third lens close to the light-in side is in a concave shape, and the surface of the third lens close to the light-out side is in a concave shape;

the fourth lens has positive refractive power, and the surface of the fourth lens close to the light-emitting side is in a convex shape;

the surface of the fifth lens close to the light-emitting side is in a concave shape;

wherein, the axial distance TTL from the surface of the first lens close to the light incidence side to the imaging surface of the photographic lens group satisfies the following conditions: 1.8mm < TTL <2.4 mm.

2. The photographing lens group of claim 1, wherein an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, and an effective focal length f4 of the fourth lens satisfy: 0.5< f1/(f2+ f4) < 1.3.

3. The photographing lens group of claim 1, wherein an effective focal length f5 of the fifth lens and an effective focal length f3 of the third lens satisfy: 0.2< f5/f3< 2.9.

4. The photographing lens group of claim 1, wherein a radius of curvature R1 of a surface of the first lens on a light incident side and a radius of curvature R2 of a surface of the first lens on a light exit side satisfy: 2.4< R2/R1< 3.5.

5. The photographing lens group of claim 1, wherein an effective focal length f of the photographing lens group, a radius of curvature R4 of a surface of the second lens on a light incident side, and a radius of curvature R8 of a surface of the fourth lens on a light exit side satisfy: -1.3< f/(R4+ R8) < -0.7.

6. The photographing lens group of claim 1, wherein a radius of curvature R5 of a surface of the third lens on a light incident side and a radius of curvature R6 of a surface of the third lens on a light exit side satisfy: 0.1< (R6+ R5)/(R6-R5) < 0.8.

7. The photographing lens group of claim 1, wherein a radius of curvature R10 of a surface of the fifth lens near the light exit side and a center thickness CT5 of the fifth lens satisfy: 1.4< R10/CT5< 4.0.

8. The photographing lens group of claim 1, wherein a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 0< (f23+ f45)/(f23-f45) < 0.7.

9. The photographing lens group of claim 1, wherein an on-axis distance SAG22 from an intersection point of an optical axis of the photographing lens group and a surface of the second lens on a light exit side to an effective radius vertex of the surface of the second lens on the light exit side, and an on-axis distance SAG31 from an intersection point of the optical axis and a surface of the third lens on the light entrance side to an effective radius vertex of the surface of the third lens on the light entrance side, and an on-axis distance SAG42 from an intersection point of the optical axis and a surface of the fourth lens on the light exit side to an effective radius vertex of the surface of the fourth lens on the light exit side satisfy: 0.6< (SAG22+ SAG31)/SAG42< 1.3.

10. The photography lens group of claim 1, wherein a center thickness CT2 of the second lens on an optical axis, a center thickness CT3 of the third lens on an optical axis, an edge thickness ET2 of the second lens, and an edge thickness ET3 of the third lens satisfy: 2.8< CT2/ET2+ ET3/CT3< 3.6.

11. The photography lens group of claim 1, wherein an edge thickness ET5 of the fifth lens and an edge thickness ET4 of the fourth lens satisfy: 1.0< ET5/ET4< 2.8.

12. A photographic lens assembly, comprising, in order from an incident side of the photographic lens assembly to an emergent side of the photographic lens assembly:

the second lens has positive refractive power, and the surface of the second lens close to the light-emitting side is in a convex shape;

wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 0.5< f1/(f2+ f4) < 1.3.

13. The photographing lens group of claim 12, wherein an effective focal length f5 of the fifth lens and an effective focal length f3 of the third lens satisfy: 0.2< f5/f3< 2.9.

14. The photographing lens group of claim 12, wherein a radius of curvature R1 of a surface of the first lens on a light incident side and a radius of curvature R2 of a surface of the first lens on a light exit side satisfy: 2.4< R2/R1< 3.5.

15. The photographing lens group of claim 12, wherein an effective focal length f of the photographing lens group, a radius of curvature R4 of a surface of the second lens on a light incident side, and a radius of curvature R8 of a surface of the fourth lens on a light exit side satisfy: -1.3< f/(R4+ R8) < -0.7.

16. The photographing lens group of claim 12, wherein a radius of curvature R5 of a surface of the third lens on a light incident side and a radius of curvature R6 of a surface of the third lens on a light exit side satisfy: 0.1< (R6+ R5)/(R6-R5) < 0.8.

17. The photographing lens group of claim 12, wherein a radius of curvature R10 of a surface of the fifth lens near the light exit side and a center thickness CT5 of the fifth lens satisfy: 1.4< R10/CT5< 4.0.

18. The photographing lens group of claim 12, wherein a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 0< (f23+ f45)/(f23-f45) < 0.7.

19. The photographing lens group of claim 12, wherein an on-axis distance SAG22 from an intersection of an optical axis of the photographing lens group and a surface on a light exit side of the second lens to an effective radius vertex of the surface on the light exit side of the second lens, and an on-axis distance SAG31 from an intersection of the optical axis and a surface on a light entrance side of the third lens to an effective radius vertex of the surface on the light entrance side of the third lens, and an on-axis distance SAG42 from an intersection of the optical axis and a surface on the light exit side of the fourth lens to an effective radius vertex of the surface on the light exit side of the fourth lens satisfy: 0.6< (SAG22+ SAG31)/SAG42< 1.3.

20. The photography lens group of claim 12, wherein a center thickness CT2 of the second lens on an optical axis, a center thickness CT3 of the third lens on an optical axis, an edge thickness ET2 of the second lens, and an edge thickness ET3 of the third lens satisfy: 2.8< CT2/ET2+ ET3/CT3< 3.6.

21. The photography lens group of claim 12, wherein an edge thickness ET5 of the fifth lens and an edge thickness ET4 of the fourth lens satisfy: 1.0< ET5/ET4< 2.8.