CN220671728U

CN220671728U - Optical imaging system

Info

Publication number: CN220671728U
Application number: CN202322265931.1U
Authority: CN
Inventors: 张良锐; 李洋; 黄崇建; 丁先翠; 闻人建科; 戴付建
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2024-03-26
Anticipated expiration: 2033-08-22

Abstract

The present utility model provides an optical imaging system comprising: a plurality of lenses including first to sixth lenses; a plurality of spacing elements including at least a first spacing element located on and at least partially contacting an image side of the first lens; a barrel in which the plurality of lenses and at least a portion of the plurality of spacer elements are disposed; the air interval of the first lens and the second lens on the optical axis is larger than the air interval of the other two adjacent lenses on the optical axis; the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first interval element, the effective focal length f of the optical imaging system and half of the Semi-FOV of the maximum field angle of the optical imaging system meet the following conditions: 0.85< (d 0s-d1 s)/(f tan (Semi-FOV)) <3.99; the inner diameter d1s of the object side surface of the first spacing element, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy the following conditions: 2.0< d1s/R2+d1s/R3<3.5. The utility model solves the problem of poor imaging quality of the optical imaging system in the prior art.

Description

Optical imaging system

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to an optical imaging system.

Background

As optical imaging systems are developed in more and more fields, the requirements for the optical imaging systems for using scene changes are also increasing. In order to meet the application requirements of fields such as shooting, scene monitoring, robot navigation obstacle avoidance and the like, an optical imaging system is required to have an ultra-large field of view and a unique picture effect, but the volume of a lens used is larger and larger, so that the miniaturization of the optical imaging system is difficult to realize. On one hand, the radial size of the front end lens of the optical imaging system is larger, and poor matching with the size of the object side end surface of the lens barrel easily causes poor light incoming quantity, so that the imaging effect is poor in a dark environment; on the other hand, in order to meet the requirement of larger light flux, the shape of the front end lens also influences the deflection range of light, so that the problems of larger aberration such as stray light, field curvature, distortion and the like easily occur, and the imaging quality is poor. Therefore, how to control the shape of the front lens of the optical imaging system and the size of the spacer element, balance the relationship between the front lens and the spacer element, and improve the imaging quality on the premise of ensuring a large field angle and miniaturization is a problem to be solved.

Disclosure of Invention

The utility model mainly aims to provide an optical imaging system so as to solve the problem of poor imaging quality of the optical imaging system in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided an optical imaging system comprising: a plurality of lenses including, in order from an object side to an image side of the optical imaging system, first to sixth lenses; a plurality of spacing elements including at least a first spacing element located on and at least partially contacting an image side of the first lens; a barrel in which at least a portion of the plurality of lenses and at least a portion of the plurality of spacer elements are disposed; the air interval of the first lens and the second lens on the optical axis of the optical imaging system is larger than the air interval of the other two adjacent lenses on the optical axis; the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first interval element, the effective focal length f of the optical imaging system and half of the Semi-FOV of the maximum field angle of the optical imaging system meet the following conditions: 0.85< (d 0s-d1 s)/(f tan (Semi-FOV)) <3.99; the inner diameter d1s of the object side surface of the first spacing element, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy the following conditions: 2.0< d1s/R2+d1s/R3<3.5.

According to another aspect of the present utility model, there is provided an optical imaging system including: a plurality of lenses including, in order from an object side to an image side of the optical imaging system, first to sixth lenses; a plurality of spacing elements including at least a first spacing element located on and at least partially contacting an image side of the first lens; a barrel in which at least a portion of the plurality of lenses and at least a portion of the plurality of spacer elements are disposed; the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacing element satisfy the following conditions: -5.0< f1/d1s <0, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens satisfying: -1.5< (d1s+d1m)/(f1+f2) <28.0. The utility model provides a six formula optical imaging system, under-5.0 < f1/d1s < 0's prerequisite, the internal diameter of first interval element is great makes more marginal light incident to the structural part of lens easily, thereby lead to more marginal parasitic light production, and this application can restrict the shape of first lens and second lens especially the shape of the effective footpath region of lens through controlling the effective focal length of first interval element and the internal diameter of first lens, thereby adjust the light path way, reduce the parasitic light of the effective footpath edge of incidence to first lens and second lens, adjust the internal diameter of interval element simultaneously and intercept the parasitic light of incident to the structural part of lens and lens surface reflection, avoid the unnecessary light incidence to follow-up lens from preceding lens in, thereby improve the penetrating parasitic light and interior anti-parasitic light problem between first lens and the second lens and promote the imaging quality of optical imaging system.

According to still another aspect of the present utility model, there is provided an optical imaging system including: a plurality of lenses including, in order from an object side to an image side of the optical imaging system, first to sixth lenses; a plurality of spacing elements including at least a first spacing element located on and at least partially contacting an image side of the first lens; a barrel in which at least a portion of the plurality of lenses and at least a portion of the plurality of spacer elements are disposed; the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel and half of the maximum field angle Semi-FOV of the optical imaging system meet the following conditions: 0.2< (d 0s-d0 m)/tan (Semi-FOV) <15.0. The application provides a six formula optical imaging system for the optical imaging system of this application has the characteristics of big angle of view through the internal diameter of the thing side terminal surface of control optical imaging system's angle of view and lens cone, can control the lens cone simultaneously and to the degree of sheltering from of light path, and effectively control the optical imaging system quantity of intaking, guarantee the light beam in object space can image at the angle range of chip image plane behind optical imaging system, and have comparatively ideal imaging under dark environment, guarantee imaging quality.

Further, the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacing element satisfy: -5.0< f1/d1s <0, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens satisfying: -1.5< (d1s+d1m)/(f1+f2) <28.0.

Further, the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 1.60< (N1+N2)/2 <1.90, and the air interval T12 between the first lens and the second lens on the optical axis, the interval distance EP01 between the object side end surface of the lens barrel and the object side surface of the first interval element along the optical axis direction, and the effective focal length f2 of the second lens satisfy the following conditions: 0.7< (EP 01+T12)/f 2<2.0.

Further, the first lens ' abbe number V1, the second lens ' abbe number V2, the first spacer element's maximum thickness CP1 in the optical axis direction, the first lens's and second lens's air space T12 on the optical axis, the first lens's and second lens's combined focal length f12 satisfy: -4.0< (V1-V2), (CP 1+ T12)/f 12<26.0.

Further, the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and half of the maximum field angle Semi-FOV of the optical imaging system satisfy: 0.2< (d 0s-d0 m)/tan (Semi-FOV) <15.0.

Further, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, and the interval distance TD between the object side surface of the first lens and the image side surface of the last lens on the optical axis satisfy: 0.5< (d0s+d0m)/(2 TD) <1.5.

Further, the sum Σct of the heights L of the lens barrels, the center thicknesses of all lenses on the optical axis satisfies: 1.0< L/ΣCT <1.9.

Further, the height L of the lens barrel, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: -2.0< L/(f 3-f 4) < -0.5.

Further, the height L of the lens barrel, the combined focal length f56 of the fifth lens and the sixth lens, satisfy: 0.1< f56/L <1.0.

Further, the outer diameter D1m of the image side surface of the first spacing element, the inner diameter D1m of the image side surface of the first spacing element, and the maximum effective radius DT21 of the object side surface of the second lens satisfy the following conditions: 0.2< (D1 m-D1 m)/DT 21<5.0.

Further, the plurality of spacer elements at least includes a second spacer element located on the image side of the second lens and at least partially contacting the image side surface of the second lens, and a spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis direction, a maximum thickness CP2 of the second spacer element along the optical axis direction, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 0.4< (EP 12+ CP 2)/(CT 2+ CT 3) <1.4.

Further, the plurality of spacer elements include at least a third spacer element located on the image side of the third lens and at least partially contacting the image side of the third lens, and the radius of curvature R6 of the image side of the third lens and the radius of curvature R7 of the object side of the fourth lens satisfy: -1.0< R6/R7<0, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter d3s of the object side of the third spacer element, the inner diameter d3m of the image side of the third spacer element: 1.0< (d3s+d3m)/(f3+f4) <40.0.

Further, the sum Σn of the refractive indices of all lenses satisfies: 1.6< ΣN/6<1.9.

Further, the curvature radius R3 of the object side surface of the second lens and the curvature radius R2 of the image side surface of the first lens satisfy: 1.2< R3/R2<3.5; the radius of curvature R1 of the object side of the first lens, the radius of curvature R4 of the image side of the second lens, the outer diameter D1m of the image side of the first spacer element, and the effective focal length f2 of the second lens satisfy the following conditions: -1.5< (R1/R4)/(D1 m/f 2) <0.

By applying the technical scheme of the utility model, the optical imaging system comprises a plurality of lenses, a plurality of spacing elements and a lens barrel, wherein the lenses sequentially comprise a first lens, a second lens and a third lens from the object side to the image side of the optical imaging system; at least a first spacer element of the plurality of spacer elements being located on and at least partially contacting an image side of the first lens; at least a portion of the plurality of lenses and at least a portion of the plurality of spacing elements are disposed within the barrel; the air interval of the first lens and the second lens on the optical axis of the optical imaging system is larger than the air interval of the other two adjacent lenses on the optical axis; the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first interval element, the effective focal length f of the optical imaging system and half of the Semi-FOV of the maximum field angle of the optical imaging system meet the following conditions: 0.85< (d 0s-d1 s)/(f tan (Semi-FOV)) <3.99; the inner diameter d1s of the object side surface of the first spacing element, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy the following conditions: 2.0< d1s/R2+d1s/R3<3.5.

The application provides a six-piece optical imaging system, through controlling the effective focal length, the angle of view, the internal diameter of the object side terminal surface of lens cone and the internal diameter of first interval component of optical imaging system, the optical imaging system of this application can control radial size more effectively, and have bigger light flux, also have better imaging quality under dark environment, but easily cause front end first, the problem that second lens goes out on the scene curved greatly, therefore this scheme is through limiting the ratio of the object side internal diameter of first interval component and the radius of curvature of first lens image side and the sum of the object side internal diameter of first interval component and the radius of curvature of second lens object side, constraint first lens and the unsmooth degree of second lens, adjust the light from the exit state of the image side of first lens and the incident state of the object side of second lens, can control the bending range of light better, effectively control front end position lens and because of realizing better light flux and less size and the influence of optical imaging system field curvature, the image quality of optical imaging system has been promoted.

Drawings

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

FIG. 1 is a schematic diagram of an optical imaging system and a partial parametric schematic diagram of an alternative embodiment of the present utility model;

FIG. 2 is a schematic diagram of an optical imaging system according to a first embodiment of the present utility model;

fig. 3 to 7 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and an MTF curve, respectively, according to the first embodiment of the present utility model;

fig. 8 is a schematic diagram showing the structure of an optical imaging system according to a second embodiment of the present utility model;

fig. 9 is a schematic diagram showing the structure of an optical imaging system according to a third embodiment of the present utility model;

fig. 10 to 14 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and an MTF curve, respectively, of the third embodiment of the present utility model;

fig. 15 is a schematic diagram showing the structure of an optical imaging system according to a fourth embodiment of the present utility model;

fig. 16 is a schematic diagram showing the structure of an optical imaging system according to a fifth embodiment of the present utility model;

fig. 17 to 21 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and an MTF curve, respectively, of the fifth embodiment of the present utility model;

fig. 22 is a schematic diagram showing the structure of an optical imaging system according to a sixth embodiment of the present utility model;

Fig. 23 is a schematic diagram showing the structure of an optical imaging system according to a seventh embodiment of the present utility model;

fig. 24 to 28 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and an MTF curve, respectively, of embodiment seven of the present utility model;

fig. 29 is a schematic diagram showing the structure of an optical imaging system according to an eighth embodiment of the present utility model;

FIG. 30 shows a spot plot of the parasitic energy angle of a first spacer element of an optical imaging system of an alternative embodiment of the utility model;

FIG. 31 shows a spot diagram of the (d1s+d1m)/(f1+f2) parasitic energy angle at less than-1.5 for an optical imaging system of the prior art;

FIG. 32 shows a spot diagram of the stray light energy angle of (d1s+d1m)/(f1+f2) of the optical imaging system of the prior art at greater than 28;

FIG. 33 shows a MTF plot for a prior art optical imaging system with d1s/R2+d1s/R3 less than 2.0;

FIG. 34 shows the MTF curve for a prior art optical imaging system with d1s/R2+d1s/R3 greater than 3.5.

Wherein the above figures include the following reference numerals:

p0, 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, first spacer elements; p1b, a first auxiliary spacer element; e2, a second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; p2, second spacer elements; p2b, a second auxiliary spacer element; e3, a third lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; p3, third spacer elements; e4, a fourth lens; s7, an object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; p4, fourth spacer elements; e5, a fifth lens; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens (an object side surface of the sixth lens); e6, a sixth lens; s11, an image side surface of the sixth lens.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

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

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

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

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

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

First embodiment

As shown in fig. 1 to 30, the optical imaging system includes a plurality of lenses, a plurality of spacer elements, a lens barrel, the plurality of lenses sequentially including first to sixth lenses from an object side to an image side of the optical imaging system; at least a first spacer element of the plurality of spacer elements being located on and at least partially contacting an image side of the first lens; at least a portion of the plurality of lenses and at least a portion of the plurality of spacing elements are disposed within the barrel; the air interval of the first lens and the second lens on the optical axis of the optical imaging system is larger than the air interval of the other two adjacent lenses on the optical axis; the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first interval element, the effective focal length f of the optical imaging system and half of the Semi-FOV of the maximum field angle of the optical imaging system meet the following conditions: 0.85< (d 0s-d1 s)/(f tan (Semi-FOV)) <3.99; the inner diameter d1s of the object side surface of the first spacing element, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy the following conditions: 2.0< d1s/R2+d1s/R3<3.5.

The application provides a six-piece optical imaging system, through controlling the effective focal length of the optical imaging system, the angle of view, the internal diameter of the object side end face of the lens barrel and the internal diameter of a first interval element, the optical imaging system of the application can more effectively control radial size, and have larger light flux, better imaging quality also exists in dark environment, but the problem that front end first and second lenses are curved more easily is caused, therefore, the ratio of the internal diameter of the object side of the first interval element to the curvature radius of the image side of the first lens and the sum of the internal diameter of the object side of the first interval element and the curvature radius of the object side of the second lens are limited, the concave-convex degree of the first lens and the second lens are restrained, the emergent state of light rays from the image side of the first lens and the incident state of the object side of the second lens are adjusted, the bending range of light rays can be better controlled, the influence of the front end position lens on the field curvature of the optical imaging system due to the fact that better light flux and smaller size are realized is effectively controlled, and the image quality of the optical imaging system is improved.

As can be seen from the MTF graph of the prior art optical imaging system shown in fig. 33 when d1s/r2+d1s/R3 is less than 2.0, the graph is not smooth enough, and the MTF performance is poor; as can be seen from the MTF graph of the prior art optical imaging system shown in fig. 34 when d1s/r2+d1s/R3 is greater than 3.5, the curve MTF performance is lower than 0.7 and the MTF performance is poor.

Preferably, the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacing element, the effective focal length f of the optical imaging system, and half of the maximum field angle Semi-FOV of the optical imaging system satisfy: 0.87< (d 0s-d1 s)/(f tan (Semi-FOV)) <3.69.

Preferably, the inner diameter d1s of the object side surface of the first spacer element, the radius of curvature R2 of the image side surface of the first lens, and the radius of curvature R3 of the object side surface of the second lens satisfy: 2.1< d1s/R2+d1s/R3<3.3.

In the present embodiment, the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: -5.0< f1/d1s <0, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens satisfying: -1.5< (d1s+d1m)/(f1+f2) <28.0. The more complicated the required spacer element structure is affected by the thickness of the raw material of the spacer element, the more complicated the stray light state is, under the premise of meeting-5.0 < f1/d1s <0, the shapes of the first lens and the second lens, especially the shapes of the effective diameter areas of the lenses, can be restrained by limiting (d1s+d1m)/(f1+f2) within a reasonable range, so that the light path line is adjusted, stray light entering the effective diameter edges of the first lens and the second lens is reduced, meanwhile, the stray light entering the structural part of the lenses and reflected by the surfaces of the lenses is intercepted by the spacer element, the unnecessary light from the front lens is prevented from entering the subsequent lenses, and the problems of penetrating stray light and internal stray light between the first lens and the second lens are improved, so that the imaging quality of the optical imaging system is improved. Preferably, -4.5< f1/d1s < -0.5, -1.3< (d1s+d1m)/(f1+f2) <27.5.

The spot pattern of the parasitic energy angle of the first spacer element of the optical imaging system as shown in fig. 30, the maximum energy intensity is about 0.000000593lm/mm ² Total energy and about 0.00000356lm. In the prior art, when (d1s+d1m)/(f1+f2) is smaller than-1.5 as shown in FIG. 31, the maximum energy intensity of the parasitic light is about 0.000003339lm/mm ² The total energy intensity is about 0.000001196lm; or when (d1s+d1m)/(f1+f2) is larger than 28 as shown in FIG. 32, the maximum energy intensity of the parasitic light is about 0.000001123lm/mm ² The total energy intensity is about 0.000000696lm. Therefore, compared with the prior art, the stray light spot of the optical imaging system is obviously weakened, and the stray light improving effect is better.

In the present embodiment, the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy the following conditions: 1.60< (N1+N2)/2 <1.90, and the air interval T12 between the first lens and the second lens on the optical axis, the interval distance EP01 between the object side end surface of the lens barrel and the object side surface of the first interval element along the optical axis direction, and the effective focal length f2 of the second lens satisfy the following conditions: 0.7< (EP 01+T12)/f 2<2.0. On the premise of meeting 1.60< (N1+N2)/2 <1.90, the thicknesses of the first lens, the second lens and the first spacing element on the optical axis can be better controlled by limiting (EP 01+T12)/f 2 in a reasonable range so as to control the structural characteristics of the first lens, the second lens and the first spacing element, so that the (EP 01+T12)/f 2 is more favorable to be limited in the reasonable range, the space utilization rate can be improved, the assembly stability is ensured, the aberration of the whole optical imaging system is reduced, the total length of the optical imaging system is shortened, and the optical imaging system can be better suitable for a system with limited size. Preferably 1.61< (n1+n2)/2 <1.85,0.8< (EP 01+t12)/f2 <1.5.

In the present embodiment, the first lens has an abbe number V1, the second lens has an abbe number V2, the first spacer element has a maximum thickness CP1 in the optical axis direction, the first and second lenses have an air space T12 on the optical axis, and the first and second lenses have a combined focal length f12 that satisfies: -4.0< (V1-V2), (CP 1+ T12)/f 12<26.0. The (V1-V2)/(CP1+T12)/f 12 is limited in a reasonable range, so that the contours of the image side surface of the first lens and the object side surface of the second lens are controlled, the optimization and improvement degree of internal reflection stray light of the first lens and the second lens are influenced, meanwhile, the influence of the first lens and the second lens on chromatic aberration of the optical imaging system can be better regulated, and the imaging quality of the optical imaging system is improved. Preferably, -3.8< (V1-V2), (CP 1+ T12)/f 12<25.5.

In the present embodiment, the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and half of the maximum field angle Semi-FOV of the optical imaging system satisfy the following conditions: 0.2< (d 0s-d0 m)/tan (Semi-FOV) <15.0. By limiting (d 0s-d0 m)/tan (Semi-FOV) to a reasonable range, the shielding degree of the lens barrel on the light path can be controlled, the ratio of the lens barrel to the maximum field angle of the optical imaging system can be controlled, the quantity of the light entering quantity of the optical imaging system can be effectively controlled, and the angle range of the light beam in the object space, which can be imaged on the chip image surface after passing through the optical imaging system, is ensured. Preferably, 0.32< (d 0s-d0 m)/tan (Semi-FOV) <13.5.

In the present embodiment, the outer diameter D0s of the object-side end surface of the lens barrel, the outer diameter D0m of the image-side end surface of the lens barrel, and the distance TD between the object-side surface of the first lens and the image-side surface of the last lens on the optical axis satisfy: 0.5< (d0s+d0m)/(2 TD) <1.5. The outer diameter D0s of the object side end face of the lens barrel is mainly controlled by the size of a module windowing and assembling bearing area, the outer diameter D0m of the image side end face of the lens barrel is controlled by the size of an imaging surface of the optical imaging system and a module motor in a matched mode, and the integral appearance style of the optical imaging system is controlled by limiting (D0s+D0m)/(2 TD) within a reasonable range, so that the thickness uniformity of the wall thickness of the lens barrel is better and the reliability of the optical imaging system is more stable under the condition of fixing the optical effective caliber. Preferably, 0.5< (d0s+d0m)/(2 TD) <1.5.

In the present embodiment, the sum Σct of the height L of the lens barrel and the center thickness of all lenses on the optical axis satisfies: 1.0< L/ΣCT <1.9. The L/ΣCTis limited in a reasonable range, so that the requirement of appearance control is met, the uniform size distribution of lenses is facilitated, the lens processing and assembling difficulty is reduced, the assembling stability is guaranteed, the aberration of the whole optical imaging system is reduced, the coma aberration and the spherical aberration of the optical imaging system are effectively reduced, meanwhile, the sizes are the same as the whole appearance style of the optical imaging system, the better the thickness uniformity of the lens barrel wall thickness is under the condition of fixing the optical effective caliber, and the more stable the reliability of the optical imaging system is. Preferably, 1.2< L/ΣCT <1.8.

In the present embodiment, the height L of the lens barrel, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following conditions: -2.0< L/(f 3-f 4) < -0.5. By limiting L/(f 3-f 4) within a reasonable range, the difference between the effective focal length of the third lens and the effective focal length of the fourth lens is controlled to be negative focal power, the low-order aberration of the optical imaging system can be effectively balanced and controlled, the sensitivity of the tolerance can be reduced, the miniaturization of the optical imaging system is maintained, meanwhile, the ratio of the optical imaging system to the height of the lens barrel is controlled, the long-focus characteristic of the optical imaging system is effectively maintained, in addition, the image side surface of the fourth lens is a convex surface, the light has a divergent effect, the larger the convex focal length is, the more serious the light divergence is, the larger the propagation diameter of the light is, and the more obvious the image height is improved. Preferably, -1.5< L/(f 3-f 4) < -0.7.

In the present embodiment, the height L of the lens barrel, the combined focal length f56 of the fifth lens and the sixth lens, satisfy: 0.1< f56/L <1.0. By limiting f56/L to a reasonable range, the range of the combined focal length of the fifth lens and the sixth lens is controlled, so that the contribution range of the focal power can be reasonably controlled, and the contribution rate of the negative spherical aberration can be reasonably controlled, so that the positive focal power of the combined focal length of the fifth lens and the sixth lens can be reasonably balanced, and on-axis spherical aberration and off-axis coma can be corrected. Preferably 0.2< f56/L <0.9.

In the present embodiment, the outer diameter D1m of the image side surface of the first spacer element, the inner diameter D1m of the image side surface of the first spacer element, and the maximum effective radius DT21 of the object side surface of the second lens satisfy the following conditions: 0.2< (D1 m-D1 m)/DT 21<5.0. By limiting (D1 m-D1 m)/DT 21 to a reasonable range, the interception condition of the first spacing element to the emergent light of the first lens can be controlled, and under the condition of ensuring the illumination of the optical imaging system, the more the blocked stray light is, the better the improvement is, and the higher the imaging quality of the optical imaging system is; meanwhile, the matching surfaces of the second lens and the first interval element can be ensured to coincide in the same straight line, and the larger the overlapping area is, the better the assembly stability is. Preferably 0.3< (D1 m-D1 m)/DT 21<4.9.

In this embodiment, the plurality of spacer elements includes at least a second spacer element located on the image side of the second lens and at least partially contacting the image side of the second lens, and a spacing distance EP12 from the image side of the first spacer element to the object side of the second spacer element in the optical axis direction, a maximum thickness CP2 of the second spacer element in the optical axis direction, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 0.4< (EP 12+ CP 2)/(CT 2+ CT 3) <1.4. By limiting (EP 12+CP2)/(CT 2+CT3) within a reasonable range, the lens forming and stray light improvement requirements are guaranteed, the edge thickness of the second lens is controlled, and the forming difficulty of the second lens is reduced; meanwhile, the contours of the second lens and the third lens can be controlled, so that the optimization and improvement degree of the internal stray light of the second lens and the third lens are improved. Preferably, 0.5< (EP 12+ CP 2)/(CT 2+ CT 3) <1.3.

In this embodiment, the plurality of spacer elements includes at least a third spacer element located on the image side of the third lens and at least partially contacting the image side of the third lens, and the radius of curvature R6 of the image side of the third lens and the radius of curvature R7 of the object side of the fourth lens satisfy the following conditions: -1.0< R6/R7<0, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter d3s of the object side of the third spacer element, the inner diameter d3m of the image side of the third spacer element: 1.0< (d3s+d3m)/(f3+f4) <40.0. On the premise of satisfying-1.0 < R6/R7<0, limiting (d3s+d3m)/(f3+f4) to a reasonable range, controlling the light output quantity of the third lens and the light input quantity of the fourth lens by controlling the inner diameter d3s of the object side surface of the third spacing element and the inner diameter d3m of the image side surface of the third spacing element, so that the luminous flux of an optical imaging system can be increased, and the imaging effect in a dark environment can be enhanced; while the aberrations of the fringe field of view can be reduced. Preferably, -0.9< R6/R7< -0.2,1.3 > (d3s+d3m)/(f3+f4) <38.0.

In the present embodiment, the sum Σn of refractive indices of all lenses satisfies: 1.6< ΣN <1.9. Through limiting Sigma N in reasonable scope, the object side or the image side of two at least lenses in control first lens to the sixth lens is the concave surface, and the object side of first lens has unsmooth opposite face type with the object side of sixth lens, is favorable to satisfying optical imaging system's imaging demand, and the lens face of different shapes has different focal lengths, has different treatment effects to the light, and optical imaging system is the stack of different lens faces, reaches certain imaging effect through the focal length stack of different lens faces, and simultaneously, the refractive index of the better control optical imaging system of different unsmooth lens is in suitable scope, makes optical imaging system's wholeness ability better. Preferably 1.71< Σn/6<1.88.

In the present embodiment, the curvature radius R3 of the object side surface of the second lens and the curvature radius R2 of the image side surface of the first lens satisfy the following conditions: 1.2< R3/R2<3.5; the radius of curvature R1 of the object side of the first lens, the radius of curvature R4 of the image side of the second lens, the outer diameter D1m of the image side of the first spacer element, and the effective focal length f2 of the second lens satisfy the following conditions: -1.5< (R1/R4)/(D1 m/f 2) <0. On the premise of satisfying 1.2< R3/R2<3.5, the sensitivity of the optical imaging system can be effectively reduced by limiting (R1/R4)/(D1 m/f 2) to a reasonable range, and reasonably controlling the total deflection angle of the edge view field on the image side surface of the first lens and the object side surface of the second lens to be within a reasonable range. Meanwhile, chromatic aberration on the shaft can be effectively reduced, and the stray light improvement effect of the first interval element can be facilitated, so that the imaging quality of the optical imaging system is improved. Preferably 1.25< R3/R2<3.3; -1.40< (R1/R4)/(D1 m/f 2) < -0.01.

Second embodiment

As shown in fig. 1 to 30, the optical imaging system includes a plurality of lenses, a plurality of spacer elements, a lens barrel, the plurality of lenses sequentially including first to sixth lenses from an object side to an image side of the optical imaging system; at least a first spacer element of the plurality of spacer elements being located on and at least partially contacting an image side of the first lens; at least a portion of the plurality of lenses and at least a portion of the plurality of spacing elements are disposed within the barrel; the air interval of the first lens and the second lens on the optical axis of the optical imaging system is larger than the air interval of the other two adjacent lenses on the optical axis; the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacing element satisfy the following conditions: -5.0< f1/d1s <0, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens satisfying: -1.5< (d1s+d1m)/(f1+f2) <28.0.

The utility model provides a six formula optical imaging system, under-5.0 < f1/d1s < 0's prerequisite, the internal diameter of first interval element is great makes more marginal light incident to the structural part of lens easily, thereby lead to more marginal parasitic light production, and this application can restrict the shape of first lens and second lens especially the shape of the effective footpath region of lens through controlling the effective focal length of first interval element and the internal diameter of first lens, thereby adjust the light path way, reduce the parasitic light of the effective footpath edge of incidence to first lens and second lens, adjust the internal diameter of interval element simultaneously and intercept the parasitic light of incident to the structural part of lens and lens surface reflection, avoid the unnecessary light incidence to follow-up lens from preceding lens in, thereby improve the penetrating parasitic light and interior anti-parasitic light problem between first lens and the second lens and promote the imaging quality of optical imaging system.

Preferably, -4.5< f1/d1s < -0.5, -1.3< (d1s+d1m)/(f1+f2) <27.5.

The present embodiment may further include other conditional expressions in the first embodiment, which are not described here in detail.

Third embodiment

As shown in fig. 1 to 30, the optical imaging system includes a plurality of lenses, a plurality of spacer elements, a lens barrel, the plurality of lenses sequentially including first to sixth lenses from an object side to an image side of the optical imaging system; at least a first spacer element of the plurality of spacer elements being located on and at least partially contacting an image side of the first lens; at least a portion of the plurality of lenses and at least a portion of the plurality of spacing elements are disposed within the barrel; the air interval of the first lens and the second lens on the optical axis of the optical imaging system is larger than the air interval of the other two adjacent lenses on the optical axis; the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel and half of the maximum field angle Semi-FOV of the optical imaging system satisfy the following conditions: 0.2< (d 0s-d0 m)/tan (Semi-FOV) <15.0.

The application provides a six formula optical imaging system, through the internal diameter of control optical imaging system's angle of view, the thing side terminal surface and the image side terminal surface of lens cone for the optical imaging system of this application has the characteristics of big angle of view, can control the lens cone simultaneously and to the degree of sheltering from of light path, and effectively control optical imaging system advances the quantity of light, guarantees that the light beam in object space can image at the angle range of chip image plane behind optical imaging system, also can obtain comparatively ideal imaging under dark environment simultaneously, guarantees imaging quality.

Preferably, 0.32< (d 0s-d0 m)/tan (Semi-FOV) <13.5.

Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface. The optical imaging system in the present application may employ a plurality of lenses, such as the six lenses described above. By reasonably distributing the effective focal length, the surface shape, the center thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging system can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the optical imaging system is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like.

However, those skilled in the art will appreciate that the number of lenses making up an optical imaging system can be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although six lenses are described as an example in the embodiment, the optical imaging system is not limited to including six lenses. The optical imaging system may also include other numbers of lenses, if desired.

Fig. 1 shows a schematic configuration of an optical imaging system of the present application. Parameters D0s, D3s, D1m, etc. are also marked in fig. 1 to clearly and intuitively understand the meaning of the parameters. In order to facilitate the presentation of the optical imaging system architecture and the specific surface geometry, these parameters are not further shown in the drawings when describing the specific embodiments.

Wherein Dis refers to an outer diameter of an object side surface of the ith spacing element, dis refers to an inner diameter of the object side surface of the ith spacing element, dim refers to an outer diameter of an image side surface of the ith spacing element, dim refers to an inner diameter of the image side surface of the ith spacing element, cpci refers to a maximum thickness of the ith spacing element, that is, a maximum distance from the object side surface of the ith spacing element to the image side surface in an optical axis direction, epi j refers to a distance from the image side surface of the ith spacing element to the object side surface of the jth spacing element in the optical axis direction, wherein i and j are positive integers equal to or greater than 1. And D0s is the inner diameter of the object side end surface of the lens barrel, and D0m is the outer diameter of the image side end surface of the lens barrel. The maximum height L of the lens barrel P0 refers to the maximum distance from the object side end surface of the lens barrel P0 to the image side end surface of the lens barrel P0 in the optical axis direction.

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

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

Example 1

As shown in fig. 2 to 7, an optical imaging system of the first embodiment of the present application is described.

As shown in fig. 2, the optical imaging system sequentially includes, from an object side to an image side, a first lens element E1, a second lens element E2, a second lens element P2, a second auxiliary lens element P2b, a third lens element E3, a third lens element P3, a fourth lens element E4, a fifth lens element E5, and a sixth lens element E6. Wherein, two spacing elements are arranged between the second lens and the third lens to improve the bearing stability.

As shown in fig. 2, the object side of the first lens element is S1, the image side of the first lens element is S2, the object side of the second lens element is S3, the image side of the second lens element is S4, the object side of the third lens element is S5, the image side of the third lens element is S6, the object side of the fourth lens element is S7, the image side of the fourth lens element is S8, the object side of the fifth lens element is S9, the image side of the fifth lens element is S10, the object side of the sixth lens element is S10, and the image side of the sixth lens element is S11. Since the fifth lens and the sixth lens are cemented to form a cemented lens, the image side surface of the fifth lens and the object side surface of the sixth lens are both S10, but the image side surface of the fifth lens and the object side surface of the sixth lens are opposite in surface shape.

Table 1 shows a basic structural parameter table of the optical imaging system of the first embodiment, in which the unit of curvature radius, thickness/distance, and effective focal length is millimeter mm.

TABLE 1

Also shown in table 1 are an object side surface S12 of the filter, an image side surface S13 of the filter, and an imaging surface S14.

Fig. 3 shows an on-axis chromatic aberration curve of the optical imaging system of the first embodiment, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging system. Fig. 4 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 5 shows a distortion curve of the optical imaging system of the first embodiment, which represents distortion magnitude values corresponding to different angles of view. Fig. 6 shows a chromatic aberration of magnification curve of the optical imaging system according to the first embodiment, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 7 shows the MTF curve of the optical imaging system according to the first embodiment, which shows the relationship between the image height and the MTF in the operating band of the optical imaging system at the frequency of 40lp/mm, and it can be seen from fig. 7 that the MTF performance is better and the curve is smooth in the 0.8 field of view.

As can be seen from fig. 3 to fig. 7, the optical imaging system according to the first embodiment can achieve good imaging quality.

Example two

The difference from the first embodiment is that parameters of the lens barrel P0 and the spacer element are different.

As shown in fig. 8, an optical imaging system of the second embodiment of the present application is described. For brevity, a description of portions similar to those of the first embodiment will be omitted.

The parameters such as the radius of curvature, the center thickness, etc. of the first to sixth lenses of the optical imaging system and the distance between the lenses thereof are the same as those of the first embodiment, as shown in table 1, but at least some of the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the distance between the spacer elements are different. The imaging quality of the optical imaging system of the present embodiment is thus as shown in fig. 3 to 8.

As shown in fig. 8, a first auxiliary spacer element P1b is further included between the first lens and the second lens, the first auxiliary spacer element P1b bearing against the image side of the first spacer element. The bearing stability is improved between the first lens and the second lens with large intervals, and meanwhile, the interception effect on stray light is improved.

Example III

The difference from the first embodiment is that parameters of the lens barrel P0, the spacer member, and the lens are different.

As shown in fig. 9 to 14, an optical imaging system of the third embodiment of the present application is described.

As shown in fig. 9, the optical imaging system includes, in order from an object side to an image side, a first lens element E1, a first spacer element P1, a second lens element E2, a second spacer element P2, a second auxiliary spacer element P2b, a third lens element E3, a fourth lens element E4, a fifth lens element E5, and a sixth lens element E6. Wherein, two spacing elements are arranged between the second lens and the third lens to improve the bearing stability. The lens cone P0 is composed of two parts which are movably connected, so that the object side surface and the outer ring surface of the first lens are respectively supported, the supporting effect on the large-caliber first lens is improved, and the assembling stability is ensured.

As shown in fig. 9, the object side of the first lens element is S1, the image side of the first lens element is S2, the object side of the second lens element is S3, the image side of the second lens element is S4, the object side of the third lens element is S5, the image side of the third lens element is S6, the object side of the fourth lens element is S7, the image side of the fourth lens element is S8, the object side of the fifth lens element is S9, the image side of the fifth lens element is S10, the object side of the sixth lens element is S10, and the image side of the sixth lens element is S11. Since the fifth lens and the sixth lens are cemented to form a cemented lens, the image side surface of the fifth lens and the object side surface of the sixth lens are both S10, but the image side surface of the fifth lens and the object side surface of the sixth lens are opposite in surface shape.

Table 2 shows a basic structural parameter table of the optical imaging system of the third embodiment, in which the unit of radius of curvature, thickness/distance, effective focal length is millimeter mm.

Face number	Surface type	Radius of curvature	Thickness of (L)	Refractive index	Abbe number
						OBJ	Spherical surface	Infinity is provided	Infinity is provided
S1	Spherical surface	8.7621	3.5379	1.74	23.6
						S2	Spherical surface	5.0437	1.2610
S3	Spherical surface	6.3763	3.8930	1.74	44.9
						S4	Spherical surface	-128.4358	0.7655
STO	Spherical surface	Infinity is provided	0.3785
						S5	Spherical surface	-8.7253	0.5000	1.69	26.7
S6	Spherical surface	11.2834	0.4098
						S7	Spherical surface	-17.0908	2.7405	1.88	40.8
S8	Spherical surface	-6.6805	0.0300
						S9	Spherical surface	8.6252	2.1547	1.74	44.9
S10	Spherical surface	-9.4202	1.9973	1.71	29.7
						S11	Spherical surface	23.5351	1.0412
S12	Spherical surface	Infinity is provided	0.4000	1.52	64.2
						S13	Spherical surface	Infinity is provided	3.7900
S14	Spherical surface	Infinity is provided

TABLE 2

Also shown in table 2 are the object side S12 of the filter, the image side S13 of the filter, and the imaging plane S14.

Fig. 10 shows an on-axis chromatic aberration curve of the optical imaging system of the third embodiment, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 11 shows an astigmatism curve of the optical imaging system of the third embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12 shows a distortion curve of the optical imaging system of the third embodiment, which represents distortion magnitude values corresponding to different angles of view. Fig. 13 shows a magnification chromatic aberration curve of the optical imaging system of the third embodiment, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 14 shows the MTF curve of the optical imaging system of the third embodiment, which shows the relationship between the image height and the MTF in the operating band of the optical imaging system at a frequency of 40lp/mm, and it can be seen from fig. 14 that the MTF performance is better and the curve is smooth in the 0.8 field of view.

As can be seen from fig. 10 to 14, the optical imaging system according to the third embodiment can achieve good imaging quality.

Example IV

The difference from the third embodiment is that parameters of the lens barrel P0 and the spacer element are different.

As shown in fig. 15, an optical imaging system of the fourth embodiment of the present application is described. For brevity, descriptions of portions similar to those of the embodiments will be omitted.

The parameters such as the radius of curvature, the center thickness, etc. of the first to sixth lenses of the optical imaging system and the distance between the lenses thereof are the same as those of the third embodiment, as shown in table 2, but at least some of the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the distance between the spacer elements are different. The imaging quality of the optical imaging system of the present embodiment is thus as shown in fig. 10 to 14.

As shown in fig. 15, a first auxiliary spacer element P1b is further included between the first lens and the second lens, and the first auxiliary spacer element P1b is abutted against the image side of the first spacer element. The bearing stability is improved between the first lens and the second lens with large intervals, and meanwhile, the interception effect on stray light is improved. In addition, the lens barrel P0 is an integrally formed structure, and the first lens has only an outer annular surface and is supported by the lens barrel P0.

Example five

As shown in fig. 16 to 21, an optical imaging system of embodiment five of the present application is described.

As shown in fig. 16, the optical imaging system includes, in order from an object side to an image side, a first lens element E1, a first spacer element P1, a first auxiliary spacer element P1b, a second lens element E2, a third lens element E3, a third spacer element P3, a fourth lens element E4, a fourth spacer element P4, a fifth lens element E5, and a sixth lens element E6. Wherein, two spacing elements are arranged between the second lens and the third lens to improve the bearing stability. The lens cone P0 is composed of two parts which are movably connected, so that the object side surface and the outer ring surface of the first lens are respectively supported, the supporting effect on the large-caliber first lens is improved, and the assembling stability is ensured.

As shown in fig. 16, the object side of the first lens element is S1, the image side of the first lens element is S2, the object side of the second lens element is S3, the image side of the second lens element is S4, the object side of the third lens element is S5, the image side of the third lens element is S6, the object side of the fourth lens element is S7, the image side of the fourth lens element is S8, the object side of the fifth lens element is S9, the image side of the fifth lens element is S10, the object side of the sixth lens element is S10, and the image side of the sixth lens element is S11. Since the fifth lens and the sixth lens are cemented to form a cemented lens, the image side surface of the fifth lens and the object side surface of the sixth lens are both S10, but the image side surface of the fifth lens and the object side surface of the sixth lens are opposite in surface shape.

Table 3 shows a basic structural parameter table of the optical imaging system of the fifth embodiment, in which the unit of radius of curvature, thickness/distance, effective focal length is millimeter mm.

TABLE 3 Table 3

Also shown in table 3 are the object side S12 of the filter, the image side S13 of the filter, and the imaging plane S14.

Fig. 17 shows an on-axis chromatic aberration curve of the optical imaging system of the fifth embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 18 shows an astigmatism curve of the optical imaging system of the fifth embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 19 shows a distortion curve of the optical imaging system of the fifth embodiment, which represents distortion magnitude values corresponding to different angles of view. Fig. 20 shows a magnification chromatic aberration curve of the optical imaging system of the fifth embodiment, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging system. Fig. 21 shows the MTF curve of the optical imaging system of the fifth embodiment, which shows the relationship between the image height and the MTF in the operating band of the optical imaging system at the frequency of 40lp/mm, and it can be seen from fig. 21 that the MTF performance is better and the curve is smooth in the 0.8 field of view.

As can be seen from fig. 17 to 21, the optical imaging system according to the fifth embodiment can achieve good imaging quality.

Example six

The difference from the fifth embodiment is that parameters of the lens barrel P0 and the spacer element are different.

As shown in fig. 22, an optical imaging system of embodiment six of the present application is described. For brevity, a description partially similar to that of the fifth embodiment will be omitted.

Parameters such as the radius of curvature, the center thickness, and the like of the first to sixth lenses of the optical imaging system and the distance between the lenses thereof are the same in embodiment six as in embodiment five, as shown in table 3, but at least some of the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter of the spacer element, and the outer diameter of the spacer element, and the distance between the spacer elements are different. The imaging quality of the optical imaging system of the present embodiment is thus as shown in fig. 17 to 21.

As shown in fig. 22, only the first spacer element is disposed between the first lens element and the second lens element for bearing, and the object side surface of the first spacer element is in bearing contact with the image side surface of the first lens element, and the outer annular surface and the image side surface of the first spacer element are respectively in bearing contact with two mutually perpendicular surfaces on the inner annular surface of the lens barrel P0. In addition, the lens barrel P0 is an integrally formed structure, and the first lens has only an outer annular surface and is supported by the lens barrel P0.

Example seven

As shown in fig. 23 to 28, an optical imaging system of embodiment seven of the present application is described.

As shown in fig. 23, the optical imaging system includes, in order from an object side to an image side, a first lens element E1, a first spacer element P1, a second lens element E2, a third lens element E3, a third spacer element P3, a fourth lens element E4, a fifth lens element E5, and a sixth lens element E6. Wherein, there is no spacing element between the second lens and the third lens, and the second lens and the third lens are directly supported by the convex part in the inner ring surface of the lens barrel.

As shown in fig. 23, the object side of the first lens element is S1, the image side of the first lens element is S2, the object side of the second lens element is S3, the image side of the second lens element is S4, the object side of the third lens element is S5, the image side of the third lens element is S6, the object side of the fourth lens element is S7, the image side of the fourth lens element is S8, the object side of the fifth lens element is S9, the image side of the fifth lens element is S10, the object side of the sixth lens element is S10, and the image side of the sixth lens element is S11. Since the fifth lens and the sixth lens are cemented to form a cemented lens, the image side surface of the fifth lens and the object side surface of the sixth lens are both S10, but the image side surface of the fifth lens and the object side surface of the sixth lens are opposite in surface shape.

Table 4 shows a basic structural parameter table of the optical imaging system of the seventh embodiment, in which the unit of radius of curvature, thickness/distance, effective focal length is millimeter mm.

Face number	Surface type	Radius of curvature	Thickness of (L)	Refractive index	Abbe number
						OBJ	Spherical surface	Infinity is provided	Infinity is provided
S1	Spherical surface	33.0714	3.7623	1.73	54.5
						S2	Spherical surface	2.8923	2.0814
S3	Spherical surface	8.5185	4.2463	1.75	27.6
						S4	Spherical surface	-13.9629	0.0300
STO	Spherical surface	Infinity is provided	0.1695
						S5	Spherical surface	-10.5817	1.5000	1.88	19.2
S6	Spherical surface	15.7430	0.2427
						S7	Spherical surface	-41.6627	1.3885	1.88	40.8
S8	Spherical surface	-5.5787	0.3000
						S9	Spherical surface	7.6252	3.1792	1.74	44.9
S10	Spherical surface	-3.0647	1.0000	1.75	27.6
						S11	Spherical surface	-17.2307	0.8100
S12	Spherical surface	Infinity is provided	0.4000	1.52	64.2
						S13	Spherical surface	Infinity is provided	3.7900
S14	Spherical surface	Infinity is provided

TABLE 4 Table 4

Also shown in table 4 are the object side S12 of the filter, the image side S13 of the filter, and the imaging plane S14.

Fig. 24 shows an on-axis chromatic aberration curve of the optical imaging system of embodiment seven, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 25 shows an astigmatism curve of the optical imaging system of the seventh embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 26 shows a distortion curve of the optical imaging system of the seventh embodiment, which represents distortion magnitude values corresponding to different angles of view. Fig. 27 shows a magnification chromatic aberration curve of the optical imaging system of the seventh embodiment, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 28 shows the MTF curve of the optical imaging system of the seventh embodiment, which shows the relationship between the image height and the MTF in the operating band of the optical imaging system at the frequency of 40lp/mm, and it can be seen from fig. 28 that the MTF performance is better and the curve is smooth in the 0.8 field of view.

As can be seen from fig. 24 to 28, the optical imaging system according to the seventh embodiment can achieve good imaging quality.

Example eight

The difference from the seventh embodiment is that parameters of the lens barrel P0 and the spacer element are different.

As shown in fig. 29, an optical imaging system of an embodiment eight of the present application is described. For brevity, descriptions of parts similar to those of the seventh embodiment will be omitted.

Parameters such as the radius of curvature, the center thickness, and the like of the first to sixth lenses of the optical imaging system and the distance between the lenses thereof are the same as those in embodiment eight, as shown in table 4, but at least some of the parameters such as the lens barrel P0, the thickness of the spacer element, the inner diameter of the spacer element, the outer diameter of the spacer element, and the distance between the spacer elements are different. The imaging quality of the optical imaging system of the present embodiment is thus as shown in fig. 24 to 28.

As shown in fig. 29, a first auxiliary spacer element P1b is further disposed between the first lens element and the second lens element, and an object side surface of the first auxiliary spacer element P1b is in bearing contact with an image side surface of the first spacer element, so that the bearing stability is improved at the large-caliber first lens element, and meanwhile, stray light is also facilitated to be intercepted. Between the fourth lens and the fifth lens there is a fourth spacer element P4, the object-side and image-side surfaces of which bear against the fourth lens and the fifth lens, respectively.

In summary, examples one to eight satisfy the relationships shown in table 5, respectively.

Condition/example	1	2	3	4	5	6	7	8
									(d0s-d1s)/(f*tan(Semi-FOV))	1.23	1.30	1.94	2.01	0.89	1.11	3.10	3.53
d1s/R2+d1s/R3	2.58	2.38	3.18	2.36	2.98	3.13	3.14	2.38
									f1/d1s	-1.00	-1.09	-3.00	-4.03	-2.80	-2.66	-0.67	-0.89
(d1s+d1m)/(f1+f2)	27.20	24.19	-0.92	-0.72	-1.06	-1.05	4.16	3.43
									(N1+N2)/2	1.80	1.80	1.74	1.74	1.63	1.63	1.74	1.74
(EP01+T12)/f2	0.82	0.81	0.91	0.87	0.90	0.92	1.02	1.02
									(V1-V2)*(CP1+T12)/f12	11.39	6.93	-3.60	-1.89	15.88	25.34	-0.35	-0.23
(d0s-d0m)/tan(Semi-FOV)	2.29	0.33	12.07	5.90	2.20	0.89	8.54	8.54
									(D0s+D0m)/(2TD)	0.93	0.99	0.91	0.87	0.88	1.02	1.01	1.18
L/∑CT	1.29	1.29	1.31	1.29	1.67	1.74	1.24	1.24
									L/(f3-f4)	-1.11	-1.11	-1.08	-1.06	-0.81	-0.84	-1.33	-1.33
f56/L	0.54	0.54	0.78	0.79	0.73	0.70	0.42	0.42
									(D1m-d1m)/DT21	0.35	1.64	0.31	1.39	0.96	0.78	4.35	4.83
(EP12+CP2)/(CT2+CT3)	0.54	0.84	0.64	1.11	/	/	/	/
									R6/R7	-0.70	-0.70	-0.66	-0.66	-0.66	-0.66	-0.38	-0.38
(d3s+d3m)/(f3+f4)	4.75	4.74	/	2.20	1.50	1.49	36.51	37.32
									∑N/6	1.85	1.85	1.75	1.75	1.75	1.75	1.79	1.79
R3/R2	3.04	3.04	1.26	1.26	1.38	1.38	2.95	2.95
									(R1/R4)/(D1m/f2)	-1.25	-0.95	-0.06	-0.05	-0.15	-0.17	-1.10	-1.06

TABLE 5

Table 6 gives part of parameters of the optical imaging systems of embodiments one to eight.

TABLE 6

Table 7 gives the effective focal lengths of the first to fourth lenses and the combined focal lengths of the fifth and sixth lenses of the optical imaging systems of the first to eighth embodiments.

Basic data/embodiment	1	2	3	4	5	6	7	8
									f(mm)	4.18	4.18	10.73	10.73	7.25	7.25	3.41	3.41
f1(mm)	-6.57	-6.57	-26.79	-26.79	-19.97	-19.97	-4.57	-4.57
									f2(mm)	7.07	7.07	8.22	8.22	6.55	6.55	7.57	7.57
f3(mm)	-6.56	-6.56	-7.04	-7.04	-5.09	-5.09	-6.93	-6.93
									f4(mm)	8.18	8.18	10.99	10.99	11.10	11.10	7.12	7.12
f56(mm)	8.91	8.91	15.16	15.16	9.57	9.57	7.79	7.79
									Semi-FOV(°)	52.15	52.15	19.51	19.51	27.31	27.31	49.65	49.65

TABLE 7

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

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

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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

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

Claims

1. An optical imaging system, comprising:

a plurality of lenses including, in order from an object side to an image side of the optical imaging system, first to sixth lenses;

a plurality of spacing elements including at least a first spacing element located on and at least partially in contact with an image side of the first lens;

A barrel within which at least a portion of the plurality of lenses and at least a portion of the plurality of spacer elements are disposed;

the air interval of the first lens and the second lens on the optical axis of the optical imaging system is larger than the air interval of the other two adjacent lenses on the optical axis;

the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first interval element, the effective focal length f of the optical imaging system and half of the Semi-FOV of the maximum field angle of the optical imaging system meet the following conditions: 0.85< (d 0s-d1 s)/(f tan (Semi-FOV)) <3.99;

the inner diameter d1s of the object side surface of the first spacing element, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy the following conditions: 2.0< d1s/R2+d1s/R3<3.5.

2. The optical imaging system of claim 1, wherein an effective focal length f1 of the first lens, an inner diameter d1s of the object side surface of the first spacer element, satisfy: -5.0< f1/d1s <0, the inner diameter d1s of the object side of the first spacer element, the inner diameter d1m of the image side of the first spacer element, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens satisfying: -1.5< (d1s+d1m)/(f1+f2) <28.0.

3. The optical imaging system according to claim 1, wherein a refractive index N1 of the first lens and a refractive index N2 of the second lens satisfy: 1.60< (N1+N2)/2 <1.90, wherein an air interval T12 between the first lens and the second lens on the optical axis, an interval distance EP01 between an object side end surface of the lens barrel and an object side surface of the first interval element along the optical axis direction, and an effective focal length f2 of the second lens are as follows: 0.7< (EP 01+T12)/f 2<2.0.

4. The optical imaging system according to claim 1, wherein an abbe number V1 of the first lens, an abbe number V2 of the second lens, a maximum thickness CP1 of the first spacing element in the optical axis direction, an air spacing T12 of the first lens and the second lens on the optical axis, and a combined focal length f12 of the first lens and the second lens satisfy between: -4.0< (V1-V2), (CP 1+ T12)/f 12<26.0.

5. The optical imaging system according to claim 1, wherein an inner diameter d0s of the object side end surface of the lens barrel, an inner diameter d0m of the image side end surface of the lens barrel, and a half of a maximum field angle Semi-FOV of the optical imaging system satisfy: 0.2< (d 0s-d0 m)/tan (Semi-FOV) <15.0.

6. The optical imaging system according to claim 1, wherein an outer diameter D0s of an object side end surface of the lens barrel, an outer diameter D0m of an image side end surface of the lens barrel, and a spacing distance TD between an object side surface of the first lens and an image side surface of a last lens on the optical axis satisfy: 0.5< (d0s+d0m)/(2 TD) <1.5.

7. The optical imaging system according to any one of claims 1 to 6, wherein a height L of the lens barrel, a sum Σct of center thicknesses of all the lenses on the optical axis, satisfies: 1.0< L/ΣCT <1.9.

8. The optical imaging system according to any one of claims 1 to 6, wherein a height L of the lens barrel, an effective focal length f3 of the third lens, and an effective focal length f4 of the fourth lens satisfy: -2.0< L/(f 3-f 4) < -0.5.

9. The optical imaging system according to any one of claims 1 to 6, wherein a height L of the lens barrel, a combined focal length f56 of the fifth lens and the sixth lens, satisfy: 0.1< f56/L <1.0.

10. The optical imaging system according to any one of claims 1 to 6, wherein between an outer diameter D1m of the image side surface of the first spacer element, an inner diameter D1m of the image side surface of the first spacer element, a maximum effective radius DT21 of the object side surface of the second lens, is satisfied: 0.2< (D1 m-D1 m)/DT 21<5.0.

11. The optical imaging system according to any one of claims 1 to 6, wherein at least a second spacer element of the plurality of spacer elements, which is located on the image side of the second lens and is at least partially in contact with the image side of the second lens, is included, a spacing distance EP12 from the image side of the first spacer element to the object side of the second spacer element in the optical axis direction, a maximum thickness CP2 of the second spacer element in the optical axis direction, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of a third lens on the optical axis satisfy: 0.4< (EP 12+ CP 2)/(CT 2+ CT 3) <1.4.

12. The optical imaging system of any of claims 1 to 6, wherein at least a third spacer element of the plurality of spacer elements is located on and at least partially in contact with an image side of a third lens, a radius of curvature R6 of the image side of the third lens, and a radius of curvature R7 of the object side of a fourth lens, satisfy: -1.0< R6/R7<0, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter d3s of the object side of the third spacer element, the inner diameter d3m of the image side of the third spacer element: 1.0< (d3s+d3m)/(f3+f4) <40.0.

13. The optical imaging system according to any one of claims 1 to 6, wherein the sum Σn of refractive indices of all the lenses satisfies: 1.6< ΣN/6<1.9.

14. The optical imaging system according to any one of claims 1 to 6, wherein a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R2 of the image side surface of the first lens satisfy: 1.2< R3/R2<3.5; the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the outer diameter D1m of the image side surface of the first spacing element, and the effective focal length f2 of the second lens satisfy the following conditions: -1.5< (R1/R4)/(D1 m/f 2) <0.