CN217543511U

CN217543511U - Optical imaging lens

Info

Publication number: CN217543511U
Application number: CN202221109906.3U
Authority: CN
Inventors: 周洁; 蒋文超; 励维芳; 金银芳; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-10-04
Anticipated expiration: 2032-05-10

Abstract

The utility model provides an optical imaging lens, include: the curvature radius of the surface of the first lens facing the object side is positive, and the curvature radius of the surface of the first lens facing the image side is positive; at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface of the second lens facing the image side is a second spacer; the curvature radius of the surface of the fourth lens facing the object side is negative, and the curvature radius of the surface of the fourth lens facing the image side is negative; at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface of the third lens facing the image side is a third spacer; the curvature radius of the surface of the fifth lens facing the image side is positive; at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side is a fourth spacer. The utility model provides a leading optical imaging lens have the unstable problem of assemblage among the prior art.

Description

Optical imaging lens

Technical Field

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

Background

Electronic products gradually become varieties which must be consumed in daily life, so that updating iteration of the electronic products is faster, meanwhile, the requirements of the market on an imaging lens of the electronic products are higher and higher, the imaging quality is high, the size of the imaging lens is required to be reduced to reduce the screen occupation ratio, the shooting range is required to be enlarged, the problems that assembly is unstable, stray light and the like can occur in assembly and yield detection (including stray light detection) are solved, and the influence caused by stray light and assembly stability is avoided.

That is to say, the front optical imaging lens in the prior art has the problems of large screen occupation ratio, small shooting range (small angle of view), stray light and unstable assembly.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an optical imaging lens, which solves the unstable problem of the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens, comprising in order from an object side to an image side: the curvature radius of the surface of the first lens facing the object side is positive, and the curvature radius of the surface of the first lens facing the image side is positive; a second lens; at least one spacer is arranged between the first lens and the second lens, and the spacer in contact with the surface of the first lens facing the image side is a first spacer; a third lens; at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface of the second lens facing the image side is a second spacer; the curvature radius of the surface of the fourth lens facing the object side is negative, and the curvature radius of the surface of the fourth lens facing the image side is negative; at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface of the third lens facing the image side is a third spacer; a fifth lens element having a positive curvature radius of a surface facing the image side; at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side is a fourth spacer.

Further, the optical imaging lens further comprises a lens barrel, and the first lens, the fifth lens, the lenses between the first lens and the fifth lens and the spacing piece are all located in the lens barrel.

Further, an inner diameter D0m of a surface of the lens barrel facing the image side, an outer diameter D0m of a surface of the lens barrel facing the image side, and an on-axis distance TD from a surface of the first lens facing the object side to a surface of the last lens facing the image side satisfy: (D0 m-D0 m)/TD >0.

Further, the radius of curvature R3 of the surface of the second lens facing the object side, the on-axis distance TD from the surface of the first lens facing the object side to the surface of the last lens facing the image side, and the maximum height L of the lens barrel satisfy: R3/TD + R3/L > -19.0.

Further, an outer diameter D4s of a surface of the fourth spacer facing the object side, an inner diameter D4s of a surface of the fourth spacer facing the object side, and a curvature radius R8 of a surface of the fourth lens facing the image side satisfy: (D4 s-D4 s)/R8 < -1.0.

Further, an outer diameter D4m of a surface of the fourth spacer facing the image side, an outer diameter D1m of a surface of the first spacer facing the image side, a maximum thickness CP1 of the first spacer, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, and an interval EP34 between the third spacer and the fourth spacer satisfy: (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) >1.0.

Further, an inner diameter d3s of a surface of the third spacer facing the object side, an inner diameter d1s of a surface of the first spacer facing the object side, an interval EP12 between the first spacer and the second spacer, a center thickness CT2 of the second lens on the optical axis of the optical imaging lens, a center thickness CT3 of the third lens on the optical axis, and an air interval T23 of the second lens and the third lens on the optical axis satisfy: (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) >0.

Further, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, the center thickness CT4 of the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, and the maximum thickness CP4 of the fourth spacer satisfy: CT3/CP4+ CT4/CP3 < 75.

Further, a distance EP12 between the first spacer and the second spacer, a distance EP34 between the third spacer and the fourth spacer, and an air interval T12 of the first lens and the second lens on the optical axis of the optical imaging lens satisfy: (EP 12+ EP 34)/T12 < 6.0.

Further, at least one spacer between the fourth lens and the fifth lens is a metal spacer.

According to another aspect of the present invention, there is provided an optical imaging lens, comprising in order from an object side to an image side: the curvature radius of the surface of the first lens facing the object side is positive, and the curvature radius of the surface of the first lens facing the image side is positive; a second lens; at least one spacer is arranged between the first lens and the second lens, and the spacer in contact with the surface of the first lens facing the image side is a first spacer; a third lens; at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface of the second lens facing the image side is a second spacer; the curvature radius of the surface of the fourth lens facing the object side is negative, and the curvature radius of the surface of the fourth lens facing the image side is negative; at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface of the third lens facing the image side is a third spacer; a fifth lens element having a positive curvature radius of a surface facing the image side; at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side is a fourth spacer; the radius of curvature R9 of the surface of the fifth lens facing the object side, the radius of curvature R10 of the surface of the fifth lens facing the image side, the outer diameter D1s of the object side surface of the first spacer, and the inner diameter D1s of the object side surface of the first spacer satisfy: R9/R10+ D1s/D1s is more than 0 and less than 6.5.

Further, an inner diameter d3s of a surface of the third spacer facing the object side, an inner diameter d1s of a surface of the first spacer facing the object side, an interval EP12 between the first spacer and the second spacer, a central thickness CT2 of the second lens on the optical axis of the optical imaging lens, a central thickness CT3 of the third lens on the optical axis, and an air interval T23 of the second lens and the third lens on the optical axis satisfy: (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) >0.

By applying the technical solution of the present invention, the optical imaging lens includes, in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, a curvature radius of a surface of the first lens facing the object side is positive, and a curvature radius of a surface of the first lens facing the image side is positive; at least one spacer is arranged between the first lens and the second lens, and the spacer in contact with the surface of the first lens facing the image side in the spacer between the first lens and the second lens is a first spacer; at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface, facing the image side, of the second lens is a second spacer; the curvature radius of the surface of the fourth lens facing the object side is negative, and the curvature radius of the surface of the fourth lens facing the image side is negative; at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface, facing the image side, of the third lens is a third spacer; the curvature radius of the surface of the fifth lens facing the image side is positive; at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side in the spacer between the fourth lens and the fifth lens is a fourth spacer.

By arranging at least one spacing piece between two adjacent lenses, the reflection of light rays between the two adjacent lenses can be reduced, the generation of stray light is favorably reduced, and the imaging quality of the optical imaging lens is ensured. Meanwhile, at least one spacer is assembled between two adjacent lenses, so that the distance between the two adjacent lenses can be adjusted, and the imaging quality of the optical imaging lens is ensured. In addition, the setting of spacer can also guarantee that lens are stable to bear and lean on, guarantees the stability of lens assembly, has effectively increased the stability that optical imaging lens group was founded.

Drawings

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

fig. 1 shows a schematic structural diagram of an optical imaging lens according to an alternative embodiment of the present invention;

fig. 2 is a schematic structural diagram of an optical imaging lens according to a first example of the present invention in a first state;

fig. 3 is a schematic structural diagram of an optical imaging lens according to a first example of the present invention in a second state;

fig. 4 to 7 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to example one of the present invention.

Fig. 8 is a schematic structural diagram of an optical imaging lens according to a second example of the present invention in a first state;

fig. 9 is a schematic structural view of an optical imaging lens according to a second example of the present invention in a second state;

fig. 10 to 13 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to example two of the present invention.

Fig. 14 is a schematic structural diagram of an optical imaging lens system according to a third example of the present invention in a first state;

fig. 15 is a schematic structural diagram of an optical imaging lens system according to a third example of the present invention in a second state;

fig. 16 to 19 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, according to example three of the present invention.

Fig. 20 is a diagram illustrating the trend of the optical path of the stray light of the optical imaging lens according to an alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a lens barrel; e1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; p1, a first spacer; p1b, a sixth spacer; e2, a second lens; s3, an object side surface of the second lens; s4, the image side surface of the second lens;

p2, second spacer; e3, a third lens; s5, an object side surface of the third lens; s6, an image side surface of the third lens; p3, third spacer; p3b, a seventh spacer; e4, a fourth lens; s7, an object side surface of the fourth lens; s8, the image side surface of the fourth lens; p4, fourth spacer; p4b, a fifth spacer; e5, a fifth lens; s9, an object side surface of the fifth lens; s10, the image side surface of the fifth lens.

Detailed Description

It should be noted that, without conflict, the imaging lens group, the lens barrel structure and the spacing element in the embodiments and examples of the present application may be combined with each other, and the imaging lens group in an embodiment is not limited to be combined with the lens barrel structure, the spacing element and the like in the embodiment. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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

In order to solve the unstable problem of leading optical imaging lens existence assemblage among the prior art, the utility model provides an optical imaging lens.

Example one

As shown in fig. 1 to 19, the optical imaging lens includes, in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, a curvature radius of a surface of the first lens facing the object side is positive, and a curvature radius of a surface of the first lens facing the image side is positive; at least one spacer is arranged between the first lens and the second lens, and the spacer in contact with the surface of the first lens facing the image side in the spacer between the first lens and the second lens is a first spacer; at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface, facing the image side, of the second lens is a second spacer; the curvature radius of the surface of the fourth lens facing the object side is negative, and the curvature radius of the surface of the fourth lens facing the image side is negative; at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface, facing the image side, of the third lens is a third spacer; the curvature radius of the surface of the fifth lens facing the image side is positive; at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side in the spacer between the fourth lens and the fifth lens is a fourth spacer.

It should be noted that the spacer may be a relatively thin shading member, or may be a relatively thick spacer ring to play a role of bearing and limiting. Of course, the thicknesses of the spacers between the two lenses may be the same or different, and need to be designed according to actual requirements. The thickness of the spacers between different lenses may be the same or different, and the spacers are designed according to actual design requirements.

The application provides a little first wide angle imaging lens, can select to adopt different equipment modes between different lens, interval component and the lens-barrel according to product service environment, for example, adopt lens lock structure to increase eccentric stability and be applicable to the comparatively harsh electronic equipment of shake parameter. The reasonably controlled edge thickness of the lens can improve the quality of the lens, and the combination and matching of the spacers with different thicknesses are utilized to improve the appearance of the lens and avoid stray light; can also set up metal space ring and increase assemblage stability and self intensity, satisfy market demand.

As shown in fig. 1, the optical imaging lens further includes a lens barrel 10, and the first to fifth lenses and the spacers therebetween are located in the lens barrel 10. The structure between the first lens and the fifth lens is used as a lens group, and the lens group is assembled in the lens barrel 10, so that the positions of the lenses can be fixed, the conditions of lens dislocation and inclination are avoided, and the working stability of the optical imaging lens is ensured. Meanwhile, the lens barrel 10 can protect the lens group, so that collision of other structural members to the lens is avoided, and the working stability of the optical imaging lens is effectively ensured.

In the present embodiment, an inner diameter D0m of a surface of the lens barrel 10 facing the image side, an outer diameter D0m of the surface of the lens barrel 10 facing the image side, and an on-axis distance TD from the surface of the first lens facing the object side to the surface of the last lens facing the image side satisfy: (D0 m-D0 m)/TD >0. Through restricting (D0 m-D0 m)/TD within a reasonable range, can place the color filter at the camera lens end or the module end to satisfy the different demands of customer, can also set up according to product self overall dimension. This arrangement also increases the degree of freedom of the color filter placement position. Preferably, (D0 m-D0 m)/TD >0.3.

In the present embodiment, the radius of curvature R3 of the surface of the second lens facing the object side, the on-axis distance TD from the surface of the first lens facing the object side to the surface of the last lens facing the image side, and the maximum height L of the lens barrel 10 satisfy: R3/TD + R3/L > -19.0. Through with R3 TD + R3/L control at reasonable within range, can be with the overall length restriction between first lens to the last lens at reasonable within range, also limit the biggest height of lens cone 10 at reasonable within range simultaneously to guarantee the miniaturized characteristics of optical imaging lens, control the radius of curvature control of second lens at reasonable within range simultaneously, control chief ray deflection angle can play the limiting action to the height of lens cone 10, compromise the miniaturized characteristics when having guaranteed optical imaging lens's wide angle demand. Preferably, -18.8 < R3/TD + R3/L < 60.

In this embodiment, the outer diameter D4s of the surface of the fourth spacer facing the object side, the inner diameter D4s of the surface of the fourth spacer facing the object side, and the radius of curvature R8 of the surface of the fourth lens facing the image side satisfy: (D4 s-D4 s)/R8 < -1.0. By controlling the (D4 s-D4 s)/R8 within a reasonable range, the bearing area of the fourth spacer and the fourth lens can be ensured, the bearing stability between the fourth spacer and the fourth lens is further ensured, and the assembling stability of the optical imaging lens is ensured. Meanwhile, the arrangement is favorable for controlling the surface shape of the surface of the fourth lens facing the image side, the processability of the fourth lens is improved, the yield is increased, and the quality of the fourth lens can be ensured. Preferably, -3 < (D4 s-D4 s)/R8 < -1.2.

It should be noted that, if there is only one spacer between the fourth lens and the fifth lens, the fourth spacer is the fourth spacer, and in this case, controlling (D4 s-D4 s)/R8 within a reasonable range can ensure the bearing areas of the fourth spacer and the fourth lens and the fifth lens, so as to ensure the stability of the bearing between the fourth spacer and the fourth lens and the fifth lens.

In the present embodiment, an outer diameter D4m of a surface of the fourth spacer facing the image side, an outer diameter D1m of a surface of the first spacer facing the image side, a maximum thickness CP1 of the first spacer, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, and an interval EP34 between the third spacer and the fourth spacer satisfy: (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) >1.0. By controlling the distance between the third spacer and the fourth spacer, the thickness of the fourth lens can be controlled, so that the deformation of the lens caused by the assembly temperature is reduced, and the yield of the lens processing and molding is improved. The maximum thickness CP1 of the first spacer is controlled, the air gap between the first lens and the second lens can be effectively controlled, the stability of the first lens and the second lens is met, the central thickness CT2 of the second lens and the central thickness of the third lens are controlled, the second lens is not easy to break in practical application, the distance between the third spacer and the fourth spacer is controlled, the assembly stability is met, meanwhile, the miniaturization of an optical system is guaranteed, the outer diameter of the surface, facing the image side, of the first spacer and the outer diameter of the surface, facing the image side, of the fourth spacer are reasonably controlled, and the angle of view of the system is guaranteed. Preferably, 1.3 < (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) < 6.

In the present embodiment, an inner diameter d3s of a surface of the third spacer facing the object side, an inner diameter d1s of a surface of the first spacer facing the object side, an interval EP12 between the first spacer and the second spacer, a central thickness CT2 of the second lens on the optical axis of the optical imaging lens, a central thickness CT3 of the third lens on the optical axis, and an air interval T23 of the second lens and the third lens on the optical axis satisfy: (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) >0. By limiting (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) within a reasonable range, the minimum inner diameters of the first spacer and the third spacer can be restricted, stray light generated by redundant light on the spacer ring and the lens can be weakened, and the relative illumination of the edge field of view can be effectively controlled, so that the optical imaging lens can still clearly image in a dark environment, and the optical imaging lens is ensured to have good imaging quality. The reasonable arrangement of the interval between the first spacer and the second spacer can ensure the stability of the main body and reduce the sensitivity of the gap between the first lens and the second lens structure; the central thickness of the second lens and the central thickness of the third lens are reasonably set, the air interval between the second lens and the third lens is limited, under the condition that the central thicknesses of the two lenses meet the forming process, the axial distance between the second lens and the third lens is reasonably restricted, light rays are effectively diffused after passing through the second lens, and meanwhile, the third lens bears the corresponding three-order distortion aberration amount, so that the distortion of the system is reasonably controlled. Preferably, 0.5 < (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) < 2.

In the present embodiment, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, the center thickness CT4 of the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, and the maximum thickness CP4 of the fourth spacer satisfy: CT3/CP4+ CT4/CP3 < 75. By controlling CT3/CP4+ CT4/CP3 in a reasonable range, the thicknesses of the third lens and the fourth lens can be controlled in a reasonable range, meanwhile, the thickness uniformity of the third spacer and the fourth spacer is guaranteed, and the stability of the optical imaging lens structure is improved. Preferably, 2 < CT3/CP4+ CT4/CP3 < 74.

In the present embodiment, a distance EP12 between the first spacer and the second spacer, a distance EP34 between the third spacer and the fourth spacer, and an air interval T12 of the first lens and the second lens on the optical axis of the optical imaging lens satisfy: (EP 12+ EP 34)/T12 < 6.0. By controlling the distance between the first lens and the second lens, the light emitted from the first lens can just enter the second lens, so that the imaging of the lens can be ensured; the distance between the first spacer and the second spacer and the distance between the third spacer and the fourth spacer are controlled, so that the stability of the first lens, the second lens, the third lens and the fourth lens is ensured, the volume of the head of the optical imaging lens can be effectively reduced, and the optical imaging lens is favorably miniaturized. Preferably, 1.5 < (EP 12+ EP 34)/T12 < 5.9.

In this embodiment, at least one spacer between the fourth lens and the fifth lens is a metal spacer. Through setting up the metal space ring between fourth lens and the fifth lens, be favorable to promoting the equipment stability, reduce the deflection effectively to and the field curvature variation of each visual field, guarantee optical imaging lens's imaging stability.

Example two

As shown in fig. 1 to 19, the optical imaging lens includes, in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, a curvature radius of a surface of the first lens facing the object side is positive, and a curvature radius of a surface of the first lens facing the image side is positive; at least one spacer is arranged between the first lens and the second lens, and the spacer in contact with the surface of the first lens facing the image side is a first spacer; at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface of the second lens facing the image side is a second spacer; the curvature radius of the surface of the fourth lens facing the object side is negative, and the curvature radius of the surface of the fourth lens facing the image side is negative; at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface of the third lens facing the image side is a third spacer; the curvature radius of the surface of the fifth lens facing the image side is positive; at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side is a fourth spacer; the radius of curvature R9 of the surface of the fifth lens facing the object side, the radius of curvature R10 of the surface of the fifth lens facing the image side, the outer diameter D1s of the object side surface of the first spacer, and the inner diameter D1s of the object side surface of the first spacer satisfy: R9/R10+ D1s/D1s is more than 0 and less than 6.5.

By arranging at least two spacing pieces between two adjacent lenses, the reflection of light rays between the two adjacent lenses can be reduced, the generation of stray light is favorably reduced, and the imaging quality of the optical imaging lens is ensured. Meanwhile, at least one spacer is assembled between two adjacent lenses, so that the distance between the two adjacent lenses can be adjusted, and the imaging quality of the optical imaging lens is ensured. In addition, the setting of spacer can also guarantee that lens are stable to bear and lean on, guarantees the stability of lens assembly, has effectively increased the stability that optical imaging lens group was founded. By limiting the R9/R10+ D1s/D1s within a reasonable range, the range of light rays entering the second lens can be controlled, the light flux of the second lens is controlled, stray light generated by the second lens is improved, the yield of the optical imaging lens is improved, and meanwhile, the surface shape of the fifth lens is favorably controlled, so that the size of the rear end of the lens barrel 10 is controlled, and the optical imaging lens is favorably matched with other structures.

Preferably, a radius of curvature R9 of a surface of the fifth lens facing the object side, a radius of curvature R10 of a surface of the fifth lens facing the image side, an outer diameter D1s of the object side surface of the first spacer, and an inner diameter D1s of the object side surface of the first spacer satisfy: R9/R10+ D1s/D1s is more than 0 and less than 6.4.

It should be noted that the spacer may be a relatively thin shading member, or may be a relatively thick spacer ring to play a role of bearing and limiting.

Of course, the thicknesses of the spacers between the two lenses may be the same or different, and need to be designed according to actual requirements. The thickness of the spacers between different lenses may be the same or different, and the spacers are designed according to actual design requirements.

As shown in fig. 1, the optical imaging lens further includes a lens barrel 10, and the first to fifth lenses and the spacers therebetween are located in the lens barrel 10. The structure between the first lens and the fifth lens is used as a lens group, and the lens group is assembled in the lens barrel 10, so that the positions of the lenses can be fixed, the conditions of lens dislocation and inclination are avoided, and the working stability of the optical imaging lens is ensured. Meanwhile, the lens cone 10 can protect the lens group, so that collision of other structural members to the lens is avoided, and the working stability of the optical imaging lens is effectively ensured.

In the present embodiment, an outer diameter D0s of a surface of the lens barrel 10 facing the object side, an outer diameter D0m of a surface of the lens barrel 10 facing the image side, and an on-axis distance TD between a surface of the first lens facing the object side and a surface of the last lens facing the image side satisfy: (D0 m-D0 m)/TD >0. Through restricting (D0 m-D0 m)/TD in reasonable within range, can place the color filter at the camera lens end or the module end to satisfy the different demands of customer, can also set up according to product self overall dimension. This arrangement also increases the degree of freedom of the color filter placement position. Preferably, (D0 m-D0 m)/TD >0.3.

In the present embodiment, the outer diameter D4s of the surface of the fourth spacer facing the object side, the inner diameter D4s of the surface of the fourth spacer facing the object side, the interval EP23 between the second spacer and the third spacer, and the half Semi-FOV of the maximum angle of view of the optical imaging lens satisfy: 1.5 < (D4 s-D4 s)/EP 23 TAN (Semi-FOV) < 8.5. By controlling the (D4 s-D4 s)/EP 23 star (Semi-FOV) within a reasonable range, the light flux of the fifth lens can be controlled, and by controlling the inner diameter of the fourth spacer, the external excessive light can be blocked, the stray light generated by the fifth lens can be improved, the imaging quality of the optical imaging lens can be improved, and the yield of the lens can be improved. Meanwhile, the maximum field angle and the interval between the second spacing element and the third spacing element are controlled within a reasonable range to control the size of the fourth lens, and further control the size of the shape of the rear end of the whole optical imaging lens so as to ensure the miniaturization of the optical imaging lens. Preferably, 1.7 < (D4 s-D4 s)/EP 23 TAN (Semi-FOV) < 8.45.

In the present embodiment, an outer diameter D4m of a surface of the fourth spacer facing the image side, an outer diameter D1m of a surface of the first spacer facing the image side, a maximum thickness CP1 of the first spacer, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, and an interval EP34 between the third spacer and the fourth spacer satisfy: (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) >1.0. By controlling the distance between the third spacer and the fourth spacer, the thickness of the fourth lens can be controlled, so that the deformation of the lens caused by the assembly temperature is reduced, and the yield of the lens processing and molding is improved. The maximum thickness CP1 of the first spacer is controlled, the air gap between the first lens and the second lens can be effectively controlled, the stability of the first lens and the second lens is met, the central thickness CT2 of the second lens and the central thickness of the third lens are controlled, the second lens is not easy to break in practical application, the distance between the third spacer and the fourth spacer is controlled, the assembly stability is met, meanwhile, the miniaturization of an optical system is guaranteed, the outer diameter of the image side of the first spacer and the outer diameter of the image side of the fourth spacer are reasonably controlled, and the angle of view of the system is guaranteed. Preferably, 1.3 < (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) < 6.

In the present embodiment, the inner diameter d3s of the surface of the third spacer facing the object side, the inner diameter d1s of the surface of the first spacer facing the object side, the interval EP12 between the first spacer and the second spacer, the central thickness CT2 of the second lens on the optical axis of the optical imaging lens, the central thickness CT3 of the third lens on the optical axis, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) >0. By limiting (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) within a reasonable range, the minimum inner diameters of the first spacer and the third spacer can be restricted, stray light generated by redundant light on the spacer ring and the lens can be weakened, and the relative illumination of the edge field of view can be effectively controlled, so that the optical imaging lens can still clearly image in a dark environment, and the optical imaging lens is ensured to have good imaging quality. The reasonable arrangement of the interval between the first spacer and the second spacer can ensure the stability of the main body and reduce the sensitivity of the structural gap between the first lens and the second lens; the center thickness of the second lens and the center thickness of the third lens are reasonably set, the air interval between the second lens and the third lens is limited, under the condition that the center thicknesses of the two lenses meet the forming process, the axial distance between the second lens and the third lens is reasonably restricted, light rays are effectively diffused after passing through the second lens, and meanwhile, the third lens bears the corresponding three-order distortion aberration quantity, so that the distortion of the system is reasonably controlled. Preferably, 0.5 < (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) < 2.

In the present embodiment, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, the center thickness CT4 of the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, and the maximum thickness CP4 of the fourth spacer satisfy: CT3/CP4+ CT4/CP3 < 75. By controlling the CT3/CP4+ CT4/CP3 within a reasonable range, the thicknesses of the third lens and the fourth lens can be controlled within a reasonable range, the thickness uniformity of the third spacer and the fourth spacer is ensured, and the stability of the optical imaging lens structure is improved. Preferably, 2 < CT3/CP4+ CT4/CP3 < 74.

In the present embodiment, the interval EP23 between the second spacer and the third spacer, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy: f3/EP32+ f3/CT2> -320. By controlling f3/EP32+ f3/CT2 within a reasonable range, the distance between the second spacer and the third spacer can be controlled within a reasonable range to control the edge thickness of the second lens within a reasonable range, and simultaneously, the center thickness of the second lens is controlled within a reasonable range to ensure the shape of the second lens. Meanwhile, f3/EP32+ f3/CT2 can limit the focal length of the third lens, which means that the focal length of the third lens can be positive or negative, the form of the third lens can be limited, the quality of the lenses is improved, stable buckling among the lenses is guaranteed, the eccentricity sensitivity is reduced, the thickness and the number of the spacing pieces are reasonably selected to reduce the generation of stray light, and the assembling stability is improved. Preferably, -320 < f3/EP32+ f3/CT2 < 160.

In the present embodiment, a distance EP12 between the first spacer and the second spacer, a distance EP34 between the third spacer and the fourth spacer, and an air interval T12 of the first lens and the second lens on the optical axis of the optical imaging lens satisfy: (EP 12+ EP 34)/T12 < 6.0. By controlling the distance between the first lens and the second lens, the light emitted from the first lens can just enter the second lens, so that the imaging of the lens is ensured; through the distance of controlling first spacer and second spacer and the distance of third spacer and fourth spacer, guarantee the stability of first lens, second lens, third lens, fourth lens assemblage, can effectively reduce the volume of optical imaging lens's head simultaneously, be favorable to optical imaging lens's miniaturization. Preferably, 1.5 < (EP 12+ EP 34)/T12 < 5.9.

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

The optical imaging lens in the present application may employ a plurality of lenses, for example, the above-mentioned five lenses. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical imaging lens 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 an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical imaging lens is not limited to include five lenses. The optical imaging lens may also include other numbers of lenses, as desired.

Fig. 1 shows a schematic structural diagram of an optical imaging lens of the present application, where parameters such as D1s, D1S, D m are labeled in fig. 1 to clearly and intuitively understand the meaning of the parameters. In order to facilitate the structure and specific surface shape of the optical imaging lens, the following description of specific examples will not refer to these parameters in the drawings.

Fig. 20 shows a trend chart of stray light in an optical imaging lens according to the application, in fig. 20, light enters the second lens through the first lens, and then is reflected to the second spacer P2 through the surface of the third lens facing the image side, and then a part of the stray light is absorbed, and then a part of the stray light is reflected to the third spacer P3 by the second spacer P2 and then is absorbed. Of course, fig. 20 shows only one stray light absorption light path, and the stray light absorption light path of different structures may also be different, and the structural design in the present application may reduce the generation of stray light.

Examples of specific surface types and parameters applicable to the optical imaging lens of the above-described embodiment are further described below with reference to the drawings.

It should be noted that, in the following examples, there are the first state and the second state, and in the same example, parameters such as the radius of curvature, the center thickness, and the like of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens of the optical imaging lens in the first state and in the second state, and the separation distance and the higher order image coefficient between the lenses are the same, but parameters such as the lens barrel 10, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the distance between the spacers are different, and the shapes of the partial lenses are different. Or the primary structure for imaging is the same while the secondary structure for imaging is different.

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

Example one

As shown in fig. 2 to 7, an optical imaging lens of the first example of the present application is described. Fig. 2 shows a schematic configuration diagram of the optical imaging lens of the first example in a first state, and fig. 3 shows a schematic configuration diagram of the optical imaging lens of the first example in a second state.

As shown in fig. 2 and fig. 3, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth spacer P4b, and a fifth lens E5.

A second spacer P2 is interposed between the second lens E2 and the third lens E3 in fig. 2, and the second lens E1 and the third lens E3 are spaced apart from each other. In fig. 3, the second lens E2 and the third lens E3 are engaged to form an engaging structure, and the second spacer P2 is located inside the engaging structure, that is, the second spacer P2 is spaced from the inner wall surface of the lens barrel.

The object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The object-side surface S3 of the second lens element is concave, and the image-side surface S4 of the second lens element is convex. The third lens element E3 has negative refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex and concave, respectively. The object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The object-side surface S9 of the fifth lens element is convex, and the image-side surface S10 of the fifth lens element is concave. Light from the object passes through the respective surfaces S1 to S10 in sequence and is finally imaged on the imaging plane.

In this example, the on-axis distance TD from the object-side-facing surface of the first lens to the image-side-facing surface of the last lens was 2.32mm, and the maximum half field angle Semi-FOV of the optical imaging lens was 49.9 °.

Table 1 shows a basic structural parameter table of the optical imaging lens of example one, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all mm.

TABLE 1

In example one, the object-side surface and the image-side surface of any one of the first lens element E1 to the fifth lens element E5 are aspheric surfaces, and the surface shape of each aspheric surface lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the distance rise from the vertex of the aspheric surface 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 =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 coefficients of the higher-order terms A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirror surfaces S1-S10 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.0489E-02

-5.3968E-03

3.5342E-05

1.3165E-05

2.0916E-05

3.9783E-05

-8.2424E-07

S2

-1.3585E-02

-1.8017E-03

2.0465E-04

-4.0133E-05

4.6785E-05

-2.1871E-05

1.2684E-05

S3

-1.0811E-02

-9.9180E-04

-8.4688E-05

6.8332E-05

-6.2329E-05

2.8612E-06

-3.1838E-05

S4

-5.4728E-02

5.7680E-03

-3.2893E-04

-2.5764E-05

-2.1931E-04

-1.8382E-04

-5.3857E-05

S5

-1.4305E-01

1.0910E-02

-5.7073E-04

-1.3975E-04

-2.9567E-04

-1.2066E-04

-2.3605E-05

S6

-8.8075E-02

-9.2805E-04

-8.3978E-04

-1.0192E-03

-2.8936E-05

-1.1872E-04

4.4963E-05

S7

2.4681E-01

7.1425E-03

4.0982E-03

-9.2625E-04

1.7278E-04

-1.4577E-04

2.1888E-05

S8

1.1764E-01

-6.1917E-03

2.4626E-02

-6.9241E-04

7.9038E-05

-7.7912E-04

-3.6272E-04

S9

-2.5452E-01

-7.7508E-02

3.1643E-02

-1.2812E-02

7.3360E-03

-1.1305E-03

8.6270E-04

S10

-5.8019E-01

-2.9612E-02

3.5741E-03

-1.0888E-02

5.9756E-03

-9.3763E-04

1.0238E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.1135E-06

-8.9859E-07

0.0000E+00

S2

-1.2941E-05

1.6556E-05

0.0000E+00

S3

1.5676E-07

-1.5199E-05

0.0000E+00

S4

-4.5496E-05

5.0159E-07

0.0000E+00

S5

-2.4020E-05

4.8688E-06

0.0000E+00

S6

-3.9092E-06

2.0627E-05

0.0000E+00

S7

1.6143E-05

1.5476E-05

0.0000E+00

S8

-1.5013E-04

-3.3827E-05

0.0000E+00

S9

-4.7745E-04

-5.0029E-05

0.0000E+00

S10

-3.4050E-04

1.4105E-04

0.0000E+00

TABLE 2

Fig. 4 shows an on-axis chromatic aberration curve of the optical imaging lens of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 5 shows an astigmatism curve of the optical imaging lens of example one, which represents meridional field curvature and sagittal field curvature. Fig. 6 shows distortion curves of the optical imaging lens of example one, which indicate distortion magnitude values corresponding to different angles of view. Fig. 7 shows a chromatic aberration of magnification curve of the optical imaging lens of the first example, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens.

As can be seen from fig. 4 to 7, the optical imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 8 to 13, an optical imaging lens of example two of the present application is described. Fig. 8 shows a schematic configuration diagram of an optical imaging lens of a second example in a first state, and fig. 9 shows a schematic configuration diagram of the optical imaging lens of the second example in a second state.

As shown in fig. 8 and fig. 9, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth spacer P4b, and a fifth lens E5.

In fig. 8, two spacers are disposed between the first lens E1 and the second lens E2, i.e., the thickness of the first spacer P1, the sixth spacer P1b, and the first spacer P1 is smaller than the thickness of the sixth spacer P1 b.

In fig. 9, the first lens E1 and the second lens E2 have a spacer therebetween, i.e., a first spacer P1. The first lens E1 and the second lens E2 are buckled to form a buckling structure, and the first spacer P1 is arranged on the inner side of the buckling structure.

The object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex and concave, respectively. The object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The object-side surface S9 of the fifth lens element is convex, and the image-side surface S10 of the fifth lens element is concave. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane.

In this example, the on-axis distance TD from the object-side-facing surface of the first lens to the image-side-facing surface of the last lens is 2.69mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 50.9 °.

Table 3 shows a basic structural parameter table of the optical imaging lens of example two, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all 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 equation 1 given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

5.5140E-02

-1.2481E-02

1.9260E-03

-6.5902E-04

2.0382E-04

-5.7114E-05

1.6367E-05

S2

2.6618E-03

-2.3080E-03

1.6582E-04

-3.2294E-05

2.5200E-05

-4.9179E-06

2.5245E-06

S3

-4.5163E-02

-8.2118E-03

-1.5011E-03

-2.3392E-04

9.7236E-06

3.9108E-05

1.3341E-05

S4

-1.4118E-01

-1.5037E-02

-4.8429E-03

6.2147E-04

3.3156E-04

4.1270E-04

1.5381E-04

S5

-1.8393E-01

-2.6824E-02

-4.0803E-04

2.0696E-03

5.7303E-04

1.6600E-04

-2.6385E-04

S6

-1.7315E-01

-5.4626E-03

9.6341E-03

-1.8856E-03

-8.2744E-04

-3.1649E-04

-2.2481E-04

S7

5.6269E-02

1.3214E-01

-2.1927E-02

6.2998E-03

4.5009E-03

-9.8704E-05

-2.1214E-04

S8

4.1535E-01

3.7924E-02

3.0835E-02

-3.5450E-02

9.8927E-03

2.0599E-03

-6.6146E-05

S9

-5.3047E-01

1.7178E-01

-4.0392E-02

1.3347E-02

-6.1149E-03

-2.7039E-04

1.5732E-03

S10

-1.2233E+00

2.0897E-01

-6.1290E-02

2.6864E-02

-6.9330E-03

1.2768E-03

-1.9719E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-4.9447E-06

-3.1272E-06

0.0000E+00

S2

-4.2958E-06

1.6339E-06

0.0000E+00

S3

8.5012E-06

-2.2272E-06

0.0000E+00

S4

8.5994E-05

2.4832E-05

0.0000E+00

S5

-1.4427E-04

-7.4758E-05

0.0000E+00

S6

-6.0632E-05

-1.4980E-05

0.0000E+00

S7

6.6906E-04

1.6169E-04

0.0000E+00

S8

-2.3500E-03

-2.0551E-04

0.0000E+00

S9

-3.1503E-04

-3.6673E-05

0.0000E+00

S10

7.6070E-04

2.0747E-04

0.0000E+00

TABLE 4

Fig. 10 shows an on-axis chromatic aberration curve of the optical imaging lens of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 11 shows astigmatism curves of the optical imaging lens of example two, which represent meridional field curvature and sagittal field curvature. Fig. 12 shows distortion curves of the optical imaging lens of example two, which indicate distortion magnitude values corresponding to different angles of view. Fig. 13 shows a chromatic aberration of magnification curve of the optical imaging lens of example two, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 10 to 13, the optical imaging lens according to example two can achieve good imaging quality.

Example III

As shown in fig. 14 to 19, an optical imaging lens of example three of the present application is described. Fig. 14 shows a schematic configuration diagram of an optical imaging lens of example three in a first state, and fig. 15 shows a schematic configuration diagram of the optical imaging lens of example three in a second state.

As shown in fig. 14 and fig. 15, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a seventh spacer P3b, a fourth lens E4, a fourth spacer P4, a fifth spacer P4b, and a fifth lens E5.

In fig. 14, the first lens E1 and the second lens E2 both bear against the first spacer P1, and the first lens E1 and the second lens E2 are disposed at intervals at other positions. Two spacers are arranged between the third lens E3 and the fourth lens E4 to realize the setting of the primary step difference, and two spacers are arranged between the fourth lens E4 and the fifth lens E5 to realize the setting of the secondary step difference, so that the large step difference is realized, and meanwhile, each structure is favorable for stable bearing.

In fig. 15, the first lens E1 and the second lens E2 are engaged to form an engaging structure, the first spacer P1 is disposed inside the engaging structure, and the first lens E1 and the second lens E2 abut on each other in an outer region of the first spacer P1.

The object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex and concave, respectively. The object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The object side surface S9 of the fifth lens element is concave, and the image side surface S10 of the fifth lens element is concave. Light from the object passes through the respective surfaces S1 to S10 in sequence and is finally imaged on the imaging plane.

In this example, the on-axis distance TD from the surface of the first lens facing the object side to the surface of the last lens facing the image side is 2.89mm, and the maximum half field angle Semi-FOV of the optical imaging lens is 44.1 °.

Table 5 shows a basic structural parameter table of the optical imaging lens of example three, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all mm.

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror in example three, wherein each aspherical mirror type can be defined by formula 1 given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

3.7370E-02

2.8729E-03

-2.5932E-04

-1.8357E-04

-1.1349E-04

-2.0928E-05

-3.1708E-05

S2

-6.6100E-03

-4.4650E-03

-5.0661E-04

-2.6114E-04

-8.8541E-05

-3.0394E-05

-2.1070E-05

S3

-7.8079E-03

3.2762E-03

-1.5753E-04

-1.4456E-04

-3.6691E-05

-2.4772E-05

-2.4816E-05

S4

2.4511E-02

5.4542E-03

6.0768E-04

7.3198E-05

2.9164E-05

5.0334E-06

7.2641E-06

S5

-1.4618E-01

-3.4820E-03

-2.8710E-03

-1.3800E-03

-8.7073E-04

-2.8861E-04

-1.4361E-04

S6

-2.5086E-01

2.2385E-02

-3.1169E-04

-2.8798E-03

-1.3532E-03

1.6427E-04

1.1868E-04

S7

-2.6348E-01

6.8673E-02

-5.5677E-03

-1.1461E-02

2.4045E-03

1.8850E-03

-1.3489E-03

S8

9.9181E-01

-1.5058E-01

-2.2402E-02

6.7833E-03

-5.0868E-03

-3.6980E-03

3.1404E-03

S9

3.2827E-01

1.8728E-01

-1.4306E-01

8.0476E-02

-3.0664E-02

6.8913E-03

2.5442E-03

S10

-1.5716E+00

2.2924E-01

-2.5910E-02

5.1403E-02

-9.6838E-03

3.1872E-03

-2.4873E-03

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.9796E-05

-2.0325E-05

0.0000E+00

S2

-1.5388E-05

-8.5388E-06

0.0000E+00

S3

-9.1575E-06

2.5280E-07

0.0000E+00

S4

-5.6718E-07

8.3274E-07

0.0000E+00

S5

-4.2808E-05

-3.1203E-05

0.0000E+00

S6

4.8185E-06

-4.0619E-05

0.0000E+00

S7

-5.2131E-04

2.9130E-04

0.0000E+00

S8

-2.3360E-03

-6.6424E-04

0.0000E+00

S9

-3.9314E-03

1.3158E-03

0.0000E+00

S10

1.0376E-05

-4.1492E-04

0.0000E+00

TABLE 6

Fig. 16 shows on-axis chromatic aberration curves of the optical imaging lens of example three, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 17 shows astigmatism curves of the optical imaging lens of example three, which represent meridional field curvature and sagittal field curvature. Fig. 18 shows distortion curves of the optical imaging lens of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 19 shows a chromatic aberration of magnification curve of the optical imaging lens of example three, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 16 to 19, the optical imaging lens according to the third example can achieve good imaging quality.

To sum up, the examples one to three satisfy the relationships shown in table 7, respectively.

Table 7 table 8 shows effective focal lengths f of the optical imaging lenses of example one to example three, and effective focal lengths f1 to f5 of the respective lenses.

Example parameters	1-1	1-2	2-1	2-2	3-1	3-2
							d1s(mm)	0.80	0.79	0.89	0.89	1.43	1.43
D1S(mm)	2.32	2.58	2.72	1.77	2.74	1.92
							D1m(mm)	2.32	2.58	2.72	1.77	2.74	1.92
d3s(mm)	1.62	1.61	2.32	2.32	2.29	2.29
							D4s(mm)	2.90	2.90	4.55	4.55	5.84	5.84
d4s(mm)	2.12	2.14	2.84	2.84	4.26	4.26
							D4m(mm)	3.80	3.90	5.60	5.60	5.74	5.74
CP1(mm)	0.02	0.02	0.02	0.02	0.02	0.02
							CP3(mm)	0.02	0.02	0.01	0.01	0.23	0.23
CP4(mm)	0.53	0.53	0.80	0.80	0.24	0.24
							EP12(mm)	0.26	0.19	0.50	0.35	0.30	0.31
EP23(mm)	0.42	0.49	0.34	0.34	0.18	0.18
							EP34(mm)	0.36	0.36	0.29	0.29	0.26	0.26
D0m(mm)	8.80	5.63	7.63	7.63	7.30	7.30
							d0m(mm)	4.65	4.68	6.45	6.45	3.02	3.02
L(mm)	3.73	3.20	3.45	3.45	3.05	3.05

TABLE 8

It should be noted that, in table 8, 1-1 is a partial parameter of the optical imaging lens in the first state in example one, 1-2 is a partial parameter of the optical imaging lens in the second state in example one, 2-1 is a partial parameter of the optical imaging lens in the first state in example two, 2-2 is a partial parameter of the optical imaging lens in the second state in example two, 3-1 is a partial parameter of the optical imaging lens in the first state in example three, and 3-2 is a partial parameter of the optical imaging lens in the second state in example three.

Table 9 gives effective focal lengths f3 of the third lenses of example one to example three.

Example parameters	1	2	3
				TD(mm)	2.32	2.69	2.89
f3(mm)	-22.55	22.74	-30.73
				Semi-FOV(°)	49.9	50.9	44.1

TABLE 9

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

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

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

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the 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. An optical imaging lens, comprising, in order from an object side to an image side:

a first lens having a positive radius of curvature of a surface facing the object side and a positive radius of curvature of a surface facing the image side;

a second lens;

at least one spacer is arranged between the first lens and the second lens, and the spacer which is in contact with the surface of the first lens facing the image side is a first spacer;

a third lens;

at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface, facing the image side, of the second lens is a second spacer;

a fourth lens element having a negative radius of curvature of a surface facing the object side and a negative radius of curvature of a surface facing the image side;

at least one spacer is arranged between the third lens and the fourth lens, and the spacer which is in contact with the surface of the third lens facing the image side is a third spacer;

a fifth lens having a positive radius of curvature of a surface facing the image side;

at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side is a fourth spacer.

2. The optical imaging lens according to claim 1, characterized in that it further comprises a lens barrel (10), the first to fifth lenses and the lenses and spacers therebetween being located within the lens barrel (10).

3. The optical imaging lens according to claim 2, wherein an inner diameter D0m of a surface of the lens barrel (10) facing the image side, an outer diameter D0m of a surface of the lens barrel (10) facing the image side, and an on-axis distance TD between a surface of the first lens facing the object side and a surface of the last lens facing the image side satisfy: (D0 m-D0 m)/TD >0.

4. The optical imaging lens according to claim 2, wherein a radius of curvature R3 of the surface of the second lens facing the object side, an on-axis distance TD from the surface of the first lens facing the object side to the surface of the last lens facing the image side, and a maximum height L of the lens barrel (10) satisfy: R3/TD + R3/L > -19.0.

5. The optical imaging lens according to claim 1, wherein an outer diameter D4s of a surface of the fourth spacer facing the object side, an inner diameter D4s of a surface of the fourth spacer facing the object side, and a radius of curvature R8 of a surface of the fourth lens facing the image side satisfy: (D4 s-D4 s)/R8 < -1.0.

6. The optical imaging lens according to claim 1, wherein an outer diameter D4m of a surface of the fourth spacer facing the image side, an outer diameter D1m of a surface of the first spacer facing the image side, a maximum thickness CP1 of the first spacer, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, and an interval EP34 between the third spacer and the fourth spacer satisfy: (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) >1.0.

7. The optical imaging lens according to claim 1, wherein an inner diameter d3s of a surface of the third spacer facing the object side, an inner diameter d1s of a surface of the first spacer facing the object side, a gap EP12 between the first spacer and the second spacer, a center thickness CT2 of the second lens on an optical axis of the optical imaging lens, a center thickness CT3 of the third lens on the optical axis, and an air gap T23 of the second lens and the third lens on the optical axis satisfy: (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) >0.

8. The optical imaging lens of claim 1, wherein a center thickness CT3 of the third lens on an optical axis of the optical imaging lens, a center thickness CT4 of the fourth lens on the optical axis, a maximum thickness CP3 of the third spacer, and a maximum thickness CP4 of the fourth spacer satisfy: CT3/CP4+ CT4/CP3 < 75.

9. The optical imaging lens according to claim 1, characterized in that a distance EP12 between the first spacer and the second spacer, a distance EP34 between the third spacer and the fourth spacer, and an air interval T12 of the first lens and the second lens on an optical axis of the optical imaging lens satisfy: (EP 12+ EP 34)/T12 < 6.0.

10. The optical imaging lens according to any one of claims 1 to 9, characterized in that at least one of the spacers between the fourth lens and the fifth lens is a metal spacer.

11. An optical imaging lens, comprising, in order from an object side to an image side:

a second lens;

a third lens;

at least one spacer is arranged between the second lens and the third lens, and the spacer in contact with the surface of the second lens facing the image side is a second spacer;

at least one spacer is arranged between the third lens and the fourth lens, and the spacer in contact with the surface of the third lens facing the image side is a third spacer;

at least one spacer is arranged between the fourth lens and the fifth lens, and the spacer in contact with the surface of the fourth lens facing the image side is a fourth spacer;

the radius of curvature R9 of the surface of the fifth lens facing the object side, the radius of curvature R10 of the surface of the fifth lens facing the image side, the outer diameter D1s of the object side surface of the first spacer, and the inner diameter D1s of the object side surface of the first spacer satisfy: R9/R10+ D1s/D1s is more than 0 and less than 6.5.

12. The optical imaging lens according to claim 11, characterized in that it further comprises a lens barrel (10), the first to fifth lenses and the lenses and spacers therebetween being located within the lens barrel (10).

13. The optical imaging lens according to claim 12, wherein an inner diameter D0m of a surface of the lens barrel (10) facing the image side, an outer diameter D0m of a surface of the lens barrel (10) facing the image side, and an on-axis distance TD between a surface of the first lens facing the object side and a surface of the last lens facing the image side satisfy: (D0 m-D0 m)/TD >0.

14. The optical imaging lens according to claim 12, wherein a radius of curvature R3 of the surface of the second lens facing the object side, an on-axis distance TD from the surface of the first lens facing the object side to the surface of the last lens facing the image side, and a maximum height L of the lens barrel (10) satisfy: R3/TD + R3/L > -19.0.

15. The optical imaging lens according to claim 11, wherein an outer diameter D4s of a surface of the fourth spacer facing the object side, an inner diameter D4s of a surface of the fourth spacer facing the object side, and a radius of curvature R8 of a surface of the fourth lens facing the image side satisfy: (D4 s-D4 s)/R8 < -1.0.

16. The optical imaging lens according to claim 11, wherein an outer diameter D4m of a surface of the fourth spacer facing the image side, an outer diameter D1m of a surface of the first spacer facing the image side, a maximum thickness CP1 of the first spacer, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, and an interval EP34 between the third spacer and the fourth spacer satisfy: (D4 m-D1 m)/(CP 1+ CT2+ CT3+ EP 34) >1.0.

17. The optical imaging lens according to claim 11, wherein an inner diameter d3s of a surface of the third spacer facing the object side, an inner diameter d1s of a surface of the first spacer facing the object side, a gap EP12 between the first spacer and the second spacer, a center thickness CT2 of the second lens on an optical axis of the optical imaging lens, a center thickness CT3 of the third lens on the optical axis, and an air gap T23 of the second lens and the third lens on the optical axis satisfy: (d 3s-d1 s)/(EP 12+ CT2+ T23+ CT 3) >0.

18. The optical imaging lens of claim 11, wherein a center thickness CT3 of the third lens on an optical axis of the optical imaging lens, a center thickness CT4 of the fourth lens on the optical axis, a maximum thickness CP3 of the third spacer, and a maximum thickness CP4 of the fourth spacer satisfy: CT3/CP4+ CT4/CP3 < 75.

19. The optical imaging lens according to claim 11, wherein a distance EP12 between the first spacer and the second spacer, a distance EP34 between the third spacer and the fourth spacer, and an air interval T12 of the first lens and the second lens on an optical axis of the optical imaging lens satisfy: (EP 12+ EP 34)/T12 < 6.0.

20. The optical imaging lens according to any one of claims 11 to 19, characterized in that at least one of the spacers between the fourth lens and the fifth lens is a metal spacer.