CN218630326U - Optical imaging system - Google Patents

Optical imaging system Download PDF

Info

Publication number
CN218630326U
CN218630326U CN202222816357.XU CN202222816357U CN218630326U CN 218630326 U CN218630326 U CN 218630326U CN 202222816357 U CN202222816357 U CN 202222816357U CN 218630326 U CN218630326 U CN 218630326U
Authority
CN
China
Prior art keywords
lens
optical imaging
spacer
imaging system
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202222816357.XU
Other languages
Chinese (zh)
Inventor
宋亚竹
李洋
丁先翠
黄林
戴付建
赵烈烽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sunny Optics Co Ltd
Original Assignee
Zhejiang Sunny Optics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Sunny Optics Co Ltd filed Critical Zhejiang Sunny Optics Co Ltd
Priority to CN202222816357.XU priority Critical patent/CN218630326U/en
Application granted granted Critical
Publication of CN218630326U publication Critical patent/CN218630326U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Lenses (AREA)

Abstract

The application discloses an optical imaging system, which comprises a lens barrel, a five-piece lens group and a plurality of spacers, wherein the five-piece lens group and the plurality of spacers are arranged in the lens barrel, the five-piece lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side on an optical axis, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the plurality of spacers at least comprise a fourth spacer which is arranged between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; wherein, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the curvature radius R9 of the object side surface of the fifth lens, the maximum thickness CP4 of the fourth spacer and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 2.0 TsT45/CP 4+ R9/d4s <4.5.

Description

Optical imaging system
Technical Field
The application relates to the field of optical devices, in particular to a five-piece type optical imaging system.
Background
With the continuous development of scientific technology, requirements on the appearance, size, imaging quality of an optical imaging system in a mobile phone and the like are higher and higher, so that when an optical imaging system adapted to a portable device such as a mobile phone is designed, not only higher pixels but also smaller volumes are required. In the actual design process of the optical imaging system, not only the imaging effect of the optical imaging system is considered, but also the optical imaging system has good processability, so as to improve the yield.
The last lens in the optical imaging system is often required to correct spherical aberration, and an aspheric design with a large surface shape variation is usually adopted, so that the molding yield of the lens is low. In addition, in order to meet the imaging requirement, in the five-piece optical imaging system, a large distance is often required to be left between the last two lenses, however, the spacer is easily deformed when being assembled due to a large step difference structure formed by the large distance, the adjacent lenses are tilted due to the deformed spacer, so that imaging cannot be performed or part of imaging cannot be performed, the spacer is deformed, the position of the spacer is shifted, and edge light enters a non-imaging part of the fifth lens to form inner reflection stray light, so that the yield is affected. The spacer that prior art adopted is the thickening spacer, and the thickening spacer can make optical imaging system's volume increase, is unfavorable for miniaturization and reduction in production cost.
SUMMERY OF THE UTILITY MODEL
The present application provides an optical imaging system that addresses at least one of, or at least partially, at least one of the problems with the prior art, or other problems.
One aspect of the present application provides an optical imaging system, which includes a lens barrel, and a five-lens group and a plurality of spacers disposed in the lens barrel, where the five-lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along an optical axis, where an object side surface of the fifth lens is a convex surface, and an image side surface of the fifth lens is a concave surface; the plurality of spacers at least comprise a fourth spacer which is arranged between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; wherein, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the curvature radius R9 of the object side surface of the fifth lens, the maximum thickness CP4 of the fourth spacer and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 2.0 sT45/CP 4+ R9/d4s <4.5.
According to an exemplary embodiment of the present application, the plurality of spacers further includes a first spacer disposed between the first lens and the second lens and in contact with an image side surface of the first lens, wherein an on-axis distance TD from an object side surface of the first lens to an image side surface of the fifth lens, an interval EP01 along the optical axis between a front end surface of the lens barrel and the first spacer, a total effective focal length f of the optical imaging system, and an effective focal length f1 of the first lens satisfy: 4.0 sP TD/EP01+ f/f1<5.0.
According to an exemplary embodiment of the present application, a radius of curvature R1 of an object-side surface of the first lens, a radius of curvature R2 of an image-side surface of the first lens, an air interval T12 of the first lens and the second lens on an optical axis, and a maximum thickness CP1 of the first spacer satisfy: 22.5< (R2-R1)/(T12-CP 1) <65.0.
According to an exemplary embodiment of the present application, the relative F-number Fno of the optical imaging system, 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: 3.0 s are composed of (Fno x) (D1 s/D1 s) <5.0.
According to an exemplary embodiment of the present application, the plurality of spacers further includes a second spacer disposed between the second lens and the third lens and in contact with an image side surface of the second lens, wherein an effective focal length f2 of the second lens, a total effective focal length f of the optical imaging system, an interval EP12 of the first spacer and the second spacer along the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 3.5< | f2/f | + EP12/CT2<4.5.
According to an exemplary embodiment of the present application, a radius of curvature R3 of the object-side surface of the second lens, a radius of curvature R4 of the image-side surface of the second lens, an air interval T23 of the second lens and the third lens on the optical axis, and a maximum thickness CP2 of the second spacer satisfy: 15.5< (R3-R4)/(T23-CP 2) <22.5.
According to an exemplary embodiment of the present application, the plurality of spacers further includes a third spacer disposed between the third lens and the fourth lens and in contact with an image-side surface of the third lens, wherein a radius of curvature R5 of an object-side surface of the third lens, a spacing EP23 of the second spacer and the third spacer along the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 4.5 are woven into (R5)/(EP 23+ CT 3) <7.5.
According to an exemplary embodiment of the present application, a center thickness CT3 of the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, a maximum thickness CP3 of the third spacer, a radius of curvature R5 of the object side surface of the third lens, and a radius of curvature R6 of the image side surface of the third lens satisfy: 8.0< | (CT 3-T34) |/CP3+ R6/R5<15.5.
According to an exemplary embodiment of the present application, a radius of curvature R8 of an image-side surface of the fourth lens, a spacing EP34 of the third spacer and the fourth spacer along the optical axis, and a maximum thickness CP4 of the fourth spacer satisfy: 1.5< | R8/(EP 34+ CP 4) | <4.0.
According to an exemplary embodiment of the present application, a total effective focal length f of the optical imaging system, a length L of the lens barrel in a direction of the optical axis, an outer diameter D0s of a front end surface of the lens barrel, and an outer diameter D0m of a rear end surface of the lens barrel satisfy: 2.0 are woven as f/L + D0m/D0s <3.0.
According to an exemplary embodiment of the present application, a Semi-FOV of a maximum field angle of the optical imaging system, a total effective focal length f of the optical imaging system, an on-axis distance TD from an object-side surface of the first lens to an image-side surface of the fifth lens, an inner diameter d0s of a front end surface of the barrel, and an inner diameter d0m of a rear end surface of the barrel satisfy: 3.5<Tan (Semi-FOV). Times.f/TD + d0m/d0s <5.0.
According to an exemplary embodiment of the application, the optical imaging system further comprises an auxiliary spacer, which is disposed between the fourth spacer and the fifth lens, and an object side surface of which is in contact with the fourth spacer and an image side surface of which is in contact with the fifth lens, wherein an effective focal length f5 of the fifth lens, an outer diameter D4bm of the image side surface of the auxiliary spacer, and an inner diameter D4bm of the image side surface of the auxiliary spacer satisfy: 1.0 sP f5/(D4 bm-D4 bm) <3.0.
This application is adjusted through the cooperation setting to battery of lens and structure, and specifically through controlling the air space of fourth lens and fifth lens on the optical axis, the maximum thickness of fourth isolator, interrelationship between the inner diameter of the object side of the curvature radius of the object side of fifth lens and fourth isolator, make the paraxial interval and the distal axis interval of fourth lens and fifth lens reach equilibrium, avoid utilizing too thick isolator to solve the poor problem of big segment, the cost is saved, and guarantee from the marginal light of fourth lens outgoing just get into in the effective diameter of fifth lens object side, reduce the probability that interior anti-parasitic light appears, the yield has been improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 shows a schematic structural diagram of an optical imaging system according to the present application;
FIG. 2 shows a schematic optical path diagram of an optical imaging system according to the present application;
fig. 3 shows a schematic configuration diagram of an optical imaging system according to example 1 of the first embodiment of the present application;
fig. 4 shows a schematic configuration diagram of an optical imaging system according to example 2 of the first embodiment of the present application;
fig. 5A to 5D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of an optical imaging system according to a first embodiment of the present application;
fig. 6 shows a schematic configuration diagram of an optical imaging system according to example 1 of a second embodiment of the present application;
fig. 7 shows a schematic configuration diagram of an optical imaging system according to example 2 of a second embodiment of the present application;
fig. 8A to 8D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of an optical imaging system according to a second embodiment of the present application;
fig. 9 shows a schematic configuration diagram of an optical imaging system according to example 1 of a third embodiment of the present application;
fig. 10 is a schematic configuration diagram showing an optical imaging system according to example 2 of a third embodiment of the present application;
fig. 11A to 11D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of an optical imaging system according to a third embodiment of the present application;
fig. 12 is a schematic configuration diagram showing an optical imaging system according to example 1 of a fourth embodiment of the present application;
fig. 13 shows a schematic configuration diagram of an optical imaging system according to example 2 of a fourth embodiment of the present application; and
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging system according to a fourth embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.
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 surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
An optical imaging system according to an exemplary embodiment of the present application may include a lens barrel and a five-piece lens group disposed within the lens barrel, the five-piece lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and the five lenses being arranged in order from an object side to an image side along an optical axis. In the first lens to the fifth lens, any two adjacent lenses may have an air space therebetween. The object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface.
In an exemplary embodiment, the optical imaging system may include a plurality of spacers disposed within the lens barrel, the plurality of spacers including at least a fourth spacer disposed between the fourth lens and the fifth lens and in direct contact with an image side surface of the fourth lens. Wherein, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the curvature radius R9 of the object-side surface of the fifth lens, the maximum thickness CP4 of the fourth spacer, and the inner diameter d4s of the object-side surface of the fourth spacer may satisfy: 2.0 sT45/CP 4+ R9/d4s <4.5. Through the air interval of reasonable control fourth lens and fifth lens on the optical axis, the maximum thickness of fourth isolator, the interrelation between the radius of curvature of the object side of fifth lens and the internal diameter of the object side of fourth isolator, can make the paraxial interval and the distance shaft interval of fourth lens and fifth lens reach balance, avoid utilizing too thick isolator to solve the poor problem of big section, the cost is saved, and guarantee from the marginal light of fourth lens outgoing just get into in the effective diameter of fifth lens object side, reduce the probability that interior anti stray light appears, the yield has been improved.
The plurality of spacers may further include a first spacer disposed between the first lens and the second lens and in direct contact with the image-side surface of the first lens, a second spacer disposed between the second lens and the third lens and in direct contact with the image-side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and in direct contact with the image-side surface of the third lens. The reasonable use of the isolating piece can effectively avoid the risk of stray light, reduce the interference to the image quality and further improve the imaging quality of the optical imaging system. These spacers will be described in detail below.
In an exemplary embodiment, the plurality of spacers may further include an auxiliary spacer which is disposed between the fourth spacer and the fifth lens, and whose object-side surface is in contact with the fourth spacer and whose image-side surface is in contact with the fifth lens.
In an exemplary embodiment, an on-axis distance TD from an object-side surface of the first lens to an image-side surface of the fifth lens, an interval EP01 along an optical axis between a front end surface of the lens barrel and the first spacer, a total effective focal length f of the optical imaging system, and an effective focal length f1 of the first lens satisfy: 4.0 sP TD/EP01+ f/f1<5.0. In the example, 4.2-woven TD/EP01+ f/f1<4.6. The axial distance from the object side surface of the first lens to the image side surface of the fifth lens, the distance between the front end surface of the lens barrel and the first spacer along the optical axis, and the mutual relation between the total effective focal length of the optical imaging system and the effective focal length of the first lens are reasonably controlled, so that the wall thickness of the front end of the lens barrel is limited in a reasonable interval, the machinability of the lens barrel, the planeness and the roundness of the front end of the lens barrel are guaranteed, the stability of the lens barrel is improved, the assembling stability and the assembling yield of the whole optical imaging system are improved, the distance between the front end surface of the lens barrel and the first spacer along the optical axis is limited in a reasonable range, the stray light position is favorably positioned, stray light is effectively intercepted, the imaging quality of the optical imaging system is improved, meanwhile, the ratio of the total effective focal length of the optical imaging system to the effective focal length of the first lens can be limited in a reasonable range, the optical sensitivity of the first lens is favorably reduced, and the imaging quality of the optical imaging system is improved.
In the exemplary embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the air interval T12 of the first lens and the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy: 22.5< (R2-R1)/(T12-CP 1) <65.0. The curvature radius of the object side surface of the first lens, the curvature radius of the image side surface of the first lens, the air space of the first lens and the second lens on the optical axis and the maximum thickness of the first spacer are reasonably controlled, so that the curvature radii of the object side surface and the image side surface of the first lens are limited within a reasonable interval, the refraction angle of a light beam at the first lens in the system is effectively controlled, the system has good processability, the air space of the first lens and the second lens on the optical axis is limited within a reasonable range, the processability of the first lens and the second lens is improved, the first spacer with larger thickness can be avoided, the cost is reduced, and the benefit is improved.
In an exemplary embodiment, the relative F-number Fno of the optical imaging system, 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: 3.0 s are composed of (Fno x) (D1 s/D1 s) <5.0. The mutual relation between the relative F number of the optical imaging system and the inner diameter and the outer diameter of the object side surface of the first isolating piece is reasonably controlled, so that the relative F number of the optical imaging system is limited in a reasonable interval, the optical imaging system is guaranteed to have enough light entering amount under the condition of good imaging quality, the imaging requirement of a light and dark environment is met, the bandwidth of the first isolating piece can be effectively controlled, the problem of spacer baking deformation caused by overlarge bandwidth of the first isolating piece is avoided, the first isolating piece can effectively block redundant light generated at the structural part after passing through the first lens, the stray light phenomenon is improved, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the effective focal length f2 of the second lens, the total effective focal length f of the optical imaging system, the interval EP12 of the first spacer and the second spacer along the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 3.5< | f2/f | + EP12/CT2<4.5. The effective focal length of the second lens, the total effective focal length of the optical imaging system, and the mutual relation between the interval of the first spacer and the second spacer along the optical axis and the central thickness of the second lens on the optical axis are reasonably controlled, so that the edge thickness and the central thickness of the second lens are balanced, the processability of the second lens is improved, the molding of the second lens is facilitated, the ratio of the effective focal length of the second lens to the total effective focal length of the optical imaging system can be limited within a reasonable range, the optical sensitivity of the second lens is reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, a radius of curvature R3 of an object-side surface of the second lens, a radius of curvature R4 of an image-side surface of the second lens, an air interval T23 of the second lens and the third lens on the optical axis, and a maximum thickness CP2 of the second spacer satisfy: 15.5< (R3-R4)/(T23-CP 2) <22.5. The mutual relation between the curvature radius of the object side surface and the image side surface of the second lens and the mutual relation between the air interval of the second lens and the third lens on the optical axis and the maximum thickness of the second isolating piece are reasonably controlled, so that the curvature radius of the object side surface and the curvature radius of the image side surface of the second lens are limited in a reasonable interval, the light is ensured to be in a converging state when passing through the second lens, the reasonability of the trend of the light is further ensured, the air interval of the second lens and the third lens on the optical axis can be limited in a reasonable range, the thicknesses of non-imaging areas of the second lens and the third lens are favorably controlled, and the structural strength of the optical imaging system is improved.
In an exemplary embodiment, a radius of curvature R5 of the object-side surface of the third lens, a spacing EP23 of the second spacer and the third spacer along the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 4.5 sR5/(EP 23+ CT 3) <7.5. The curvature radius of the object side surface of the third lens, the distance E between the second spacer and the third spacer along the optical axis and the central thickness of the third lens on the optical axis are reasonably controlled, the central thickness of the third lens on the optical axis and the thickness of a non-imaging area of the third lens can be limited within a reasonable range, the machinability of the third lens is guaranteed, the machining precision of the lens is improved, and the assembly yield of the optical imaging system is improved.
In an exemplary embodiment, a center thickness CT3 of the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, a maximum thickness CP3 of the third spacer, a radius of curvature R5 of the object-side surface of the third lens, and a radius of curvature R6 of the image-side surface of the third lens satisfy: 8.0< | (CT 3-T34) |/CP3+ R6/R5<15.5. The center thickness of the third lens on the optical axis, the air interval of the third lens and the fourth lens on the optical axis, and the correlation between the maximum thickness of the third spacer and the curvature radius of the object side surface and the image side surface of the third lens are reasonably controlled, so that the center thickness of the third lens on the optical axis and the air interval of the third lens and the fourth lens on the optical axis are limited to a reasonable interval, the air interval of the third lens and the fourth lens on the optical axis is ensured to be larger, a larger stray light improving space is provided, stray light is favorably improved, the imaging quality of the optical imaging system is improved, the curvature radii of the object side surface and the image side surface of the third lens are also constrained to a certain range, the optical distortion of the optical imaging system is favorably reduced, and the optical imaging system is ensured to have good imaging quality.
In an exemplary embodiment, a radius of curvature R8 of an image-side surface of the fourth lens, a spacing EP34 of the third spacer and the fourth spacer along the optical axis, and a maximum thickness CP4 of the fourth spacer satisfy: 1.5< | R8/(EP 34+ CP 4) | <4.0. The curvature radius of the image side face of the fourth lens, the mutual relation between the interval of the third spacer and the fourth spacer along the optical axis and the maximum thickness of the fourth spacer are reasonably controlled, the size distribution uniformity of the fourth lens is favorably ensured, the assembling stability and the assembling yield are improved, the thickness and the strength of the fourth spacer are favorably ensured, the structural strength of an optical imaging system is improved, and the generation of stray light is reduced through the fourth spacer.
In an exemplary embodiment, the total effective focal length f of the optical imaging system, the length L of the lens barrel in the direction of the optical axis, the outer diameter D0s of the front end surface of the lens barrel, and the outer diameter D0m of the rear end surface of the lens barrel satisfy: 2.0 are woven as f/L + D0m/D0s <3.0. In the example, 2.2 were woven of f/L + D0m/D0s <2.7. The total effective focal length of the optical imaging system, the length of the lens barrel along the direction of the optical axis, and the correlation between the outer diameter of the front end surface of the lens barrel and the outer diameter of the rear end surface of the lens barrel are reasonably controlled, so that the length of the lens barrel along the direction of the optical axis is effectively controlled, the scratch problem caused by the outward protrusion of the lens is avoided, the appearance yield of the optical imaging system is improved, the appearance structure of the optical imaging system is ensured to be in a reasonable range by controlling the ratio of the outer diameter of the front end surface of the lens barrel to the outer diameter of the rear end surface of the lens barrel, the space where the optical imaging system is located is reduced, the utilization rate of a mobile phone space is improved, in addition, the thickness uniformity of the lens barrel can be ensured, the machinability of the lens barrel is improved, and the assembly yield of the optical imaging system is improved.
In an exemplary embodiment, a half Semi-FOV of a maximum field angle of the optical imaging system, a total effective focal length f of the optical imaging system, an on-axis distance TD from an object-side surface of the first lens to an image-side surface of the fifth lens, an inner diameter d0s of a front end surface of the barrel, and an inner diameter d0m of a rear end surface of the barrel satisfy: 3.5<Tan (Semi-FOV). Times.f/TD + d0m/d0s <5.0. The half of the maximum field angle of the optical imaging system, the total effective focal length of the optical imaging system, the axial distance from the object side surface of the first lens to the image side surface of the fifth lens, and the mutual relationship between the inner diameter of the front end surface of the lens barrel and the inner diameter of the rear end surface of the lens barrel are reasonably controlled, and on the premise that the optical imaging system has a sufficiently large field angle, the total length of the optical imaging system and the opening on the image side of the lens barrel can be reasonably limited, so that the optical imaging system has good image quality on the basis of realizing miniaturization.
In an exemplary embodiment, the effective focal length f5 of the fifth lens, the outer diameter D4bm of the image side surface of the auxiliary spacer, and the inner diameter D4bm of the image side surface of the auxiliary spacer satisfy: 1.0 sP f5/(D4 bm-D4 bm) <3.0. The effective focal length of the fifth lens element and the inner and outer diameters of the image side surface of the auxiliary isolating element are reasonably controlled, the refractive power of the fifth lens element can be reasonably controlled, so that the optical imaging system has smaller spherical aberration, the optical imaging system is ensured to have good imaging quality in an on-axis view field, the optical sensitivity of the fifth lens element is reduced, the fifth lens element is favorable for batch production, the inner and outer diameters of the image side surface of the auxiliary isolating element can be reasonably limited, the bearing width between the fourth isolating element and the auxiliary isolating element is ensured, and the assembling stability and the assembling yield are improved.
In an exemplary embodiment, the optical imaging system further includes a diaphragm, and the diaphragm may be located between the object side and the first lens. The diaphragm is arranged between the object side and the first lens, so that the miniaturization of the optical imaging system is facilitated, the optical imaging system has a good imaging effect, the size of the optical imaging system on the screen is small enough when the optical imaging system is applied to a mobile phone as a front camera, and the requirement of the whole screen of the mobile phone is better met.
In an exemplary embodiment, the first lens to the fifth lens are plastic lenses, which can effectively control the length of the optical imaging system, reduce the weight of the optical imaging system, reduce the manufacturing cost and improve the production efficiency. The first to fourth spacers and the auxiliary spacer are made of plastic spacers, which can effectively improve the processability of the lens, improve the molding yield, reduce the weight and reduce the cost.
The optical imaging system according to the above-described embodiment of the present application may employ five lenses and a plurality of spacers, such as the above five lens groups and five spacers (e.g., the first to fourth spacers and the auxiliary spacer). By reasonably distributing the optical parameters of the lenses and the isolators, the optical imaging system can be miniaturized, the spherical aberration and the stray light risk of the optical imaging system can be reduced, and the imaging quality, the machinability, the assembly stability and the assembly yield of the optical imaging system are improved.
In the embodiment of the present application, at least one of the mirror surfaces of each of the first to fifth lenses 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 in imaging can be eliminated as much as possible, and the imaging quality is further improved.
However, it will be appreciated by those skilled in the art that the number of lenses and spacers making up the optical imaging system can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses and five spacers are exemplified in the embodiment, the optical imaging system is not limited to include a five-piece lens group and five spacers. The optical imaging system may also include other numbers of lenses or spacers, if desired.
Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.
First embodiment
An optical imaging system according to a first embodiment of the present application is described below with reference to fig. 3 to 5D. Fig. 3 shows a schematic structural view of an optical imaging system 110 according to example 1 of the first embodiment of the present application; fig. 4 shows a schematic configuration diagram of an optical imaging system 120 according to example 2 of the first embodiment of the present application.
As shown in fig. 3 and 4, each of the optical imaging systems 110 and 120 includes a lens barrel P0, and a five-piece lens group and a plurality of spacers disposed in the lens barrel P0, the five-piece lens group includes, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The stop STO can be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4b. The spacers P1-P4 and the auxiliary spacer P4b can block the entry of external redundant light, so that the lens and the lens barrel P0 are better supported, and the structural stability of the optical imaging system is enhanced.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with positive refractive power has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The filter has an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the surfaces S1 to S12 in the optical path M shown in fig. 2 and is finally imaged on the imaging surface S13.
Table 1 shows a basic parameter table of the optical imaging system of the first embodiment in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
Figure BDA0003907609750000081
Figure BDA0003907609750000091
TABLE 1
In this embodiment, the total effective focal length F of the optical imaging system is 3.75mm, the Semi-FOV of the maximum field angle of the optical imaging system is 41.6 °, and the relative F-number Fno of the optical imaging system is 2.30.
In the first embodiment, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
Figure BDA0003907609750000092
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =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 aspheric surface. Tables 2-1 to 2-2 show the coefficients A of the high-order terms that can be used for the aspherical mirror surfaces S1-S10 in the first embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 4.0438E-02 2.6019E-03 7.9178E-04 1.9712E-04 4.9552E-05 1.4289E-05 2.6696E-06
S2 -2.8048E-02 2.8134E-03 2.0507E-03 4.1557E-04 -3.5967E-06 2.7929E-05 3.7500E-06
S3 -5.2820E-02 6.5407E-03 1.8181E-03 1.4043E-04 -2.9748E-04 2.3190E-05 3.5760E-06
S4 -3.4349E-02 1.1114E-02 1.1736E-03 6.1637E-04 -3.1036E-04 2.2621E-06 -2.4962E-05
S5 -1.1558E-01 8.5462E-03 2.3180E-03 3.3560E-03 6.8796E-04 2.5441E-05 -1.4514E-04
S6 -3.0620E-01 5.8495E-03 1.2914E-03 5.0112E-03 1.9196E-03 8.0119E-04 2.5733E-04
S7 -2.7627E-01 4.6973E-03 -8.7537E-04 -1.9190E-03 -1.1111E-03 -7.7647E-04 -3.3276E-04
S8 -8.7292E-02 7.7699E-02 -1.6683E-02 -9.5163E-03 4.9614E-04 1.0743E-03 -1.6797E-04
S9 -1.4782E+00 5.8229E-01 -1.5233E-01 3.1093E-02 -1.3280E-02 5.5247E-03 -1.8105E-04
S10 -1.6933E+00 3.7095E-01 -7.9870E-02 4.8896E-02 -1.9422E-02 4.5761E-03 -2.4506E-03
TABLE 2-1
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.5611E-06 -1.1996E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 6.6840E-06 1.8404E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 8.2327E-06 5.4486E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 3.3448E-06 1.9697E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -8.7198E-05 -4.2498E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S6 1.2268E-04 3.6364E-05 3.1487E-05 5.5463E-06 9.6646E-06 1.8645E-06 0.0000E+00
S7 -4.7345E-05 2.2600E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S8 -1.9547E-04 -6.1917E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S9 -1.0371E-03 3.3845E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S10 1.2603E-04 -2.4271E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
Tables 2 to 2
The optical imaging systems 110 and 120 in examples 1 and 2 of the first embodiment are different in the structural sizes of the lens barrel and the spacer included therein. Tables 3-1 to 3-2 show some basic parameters of the lens barrel and the spacer of the optical imaging systems 110 and 120 of the first embodiment, such as EP01, CP1, EP12, CP2, EP23, CP3, EP34, CP4, D0m, D0s, D1s, D4bm, L, etc., some of the basic parameters listed in tables 3-1 to 3-2 are measured according to the labeling method shown in fig. 1, and the units of the basic parameters listed in tables 3-1 to 3-2 are millimeters (mm).
Examples/parameters EP01 CP1 EP12 CP2 EP23 CP3 EP34 CP4 L
1-1 1.007 0.016 0.369 0.016 0.367 0.016 0.503 0.588 4.116
1-2 0.972 0.016 0.405 0.016 0.432 0.016 0.388 0.638 4.015
TABLE 3-1
Examples/parameters D0m D0s d0m d0s D1s d1s d4s D4bm d4bm
1-1 6.630 4.007 6.170 1.865 3.573 1.709 3.523 5.800 4.330
1-2 6.630 4.920 6.210 1.768 2.606 1.698 3.523 5.660 4.330
TABLE 3-2
Fig. 5A shows on-axis chromatic aberration curves of the optical imaging systems 110 and 120 of the first embodiment, which represent the convergent focus deviations of light rays of different wavelengths after passing through the optical imaging systems 110 and 120. Fig. 5B shows astigmatism curves of the optical imaging systems 110 and 120 of the first embodiment, which represent meridional field curvature and sagittal field curvature corresponding to different image heights. Fig. 5C shows distortion curves of the optical imaging systems 110 and 120 of the first embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 5D shows a chromatic aberration of magnification curve of the optical imaging systems 110 and 120 of the first embodiment, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging systems 110 and 120. As can be seen from fig. 5A to 5D, the optical imaging systems 110 and 120 according to the first embodiment can achieve good imaging quality.
Second embodiment
An optical imaging system according to a second embodiment of the present application is described below with reference to fig. 6 to 8D. Fig. 6 shows a schematic structural diagram of an optical imaging system 210 according to example 1 of a second embodiment of the present application; fig. 7 shows a schematic structural diagram of an optical imaging system 220 according to example 2 of the second embodiment of the present application.
As shown in fig. 6 and 7, each of the optical imaging systems 210 and 220 includes a lens barrel P0, and a five-piece lens group and a plurality of spacers disposed in the lens barrel P0, the five-piece lens group includes, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The stop STO may be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4b. The spacers P1-P4 and the auxiliary spacer P4b can block the entry of external redundant light, so that the lens and the lens barrel P0 are better supported, and the structural stability of the optical imaging system is enhanced.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with positive refractive power has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The filter has an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the surfaces S1 to S12 in the optical path M shown in fig. 2 and is finally imaged on the imaging surface S13.
Table 4 shows a basic parameter table of the optical imaging system of the second embodiment in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
Figure BDA0003907609750000111
TABLE 4
In this embodiment, the total effective focal length F of the optical imaging system is 3.82mm, the Semi-FOV, which is the half of the maximum field angle of the optical imaging system, is 40.5 °, and the relative F-number Fno of the optical imaging system is 2.30.
In the second embodiment, both 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. Tables 5-1 to 5-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S10 in the second embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 4.5335E-02 3.3357E-03 6.8481E-04 1.2403E-04 3.1676E-05 1.0112E-05 1.8057E-06
S2 -2.8469E-02 3.4248E-03 1.6921E-03 4.5789E-04 -2.5212E-04 -6.3393E-06 -6.5659E-06
S3 -3.5794E-02 6.0736E-03 6.1408E-04 2.6867E-04 -4.7035E-04 -3.5522E-06 -1.1792E-05
S4 -1.1806E-02 9.0004E-03 -1.4298E-04 3.3258E-04 -2.2811E-04 -6.2588E-06 -1.5709E-05
S5 -1.0633E-01 9.1365E-03 3.2343E-03 2.0413E-03 4.2899E-04 -2.2688E-05 -7.3601E-05
S6 -2.2002E-01 4.8815E-03 7.2064E-03 5.4476E-03 2.7691E-03 1.2048E-03 5.1657E-04
S7 -3.1123E-01 -3.0408E-02 -4.7523E-03 -4.1826E-03 -2.7280E-03 -1.3910E-03 -6.3082E-04
S8 -1.3570E-01 6.1642E-02 -1.8599E-03 -1.0088E-02 -1.2602E-03 1.5186E-03 5.9163E-05
S9 -1.2952E+00 4.1710E-01 -9.4607E-02 2.5224E-02 -9.1637E-03 1.7054E-03 -5.1585E-04
S10 -1.4860E+00 2.8183E-01 -9.2365E-02 4.1816E-02 -1.1129E-02 4.8797E-03 -2.0018E-03
TABLE 5-1
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 2.6260E-06 -1.0417E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 4.4086E-06 -4.0488E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 4.6353E-06 -2.8303E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 -6.8734E-08 2.9127E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -4.6453E-05 -1.4983E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S6 1.7506E-04 5.2911E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -2.3960E-04 -6.3089E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S8 -2.9660E-04 -1.6071E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S9 4.7180E-04 -1.3161E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S10 5.6087E-04 -4.4513E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 5-2
The optical imaging systems 210 and 220 in examples 1 and 2 of the second embodiment are different in the structural sizes of the lens barrel and the spacer included therein. Tables 6-1 to 6-2 show some basic parameters of the lens barrel and the spacer of the optical imaging systems 210 and 220 of the second embodiment, such as EP01, CP1, EP12, CP2, EP23, CP3, EP34, CP4, D0m, D0s, D1s, D4bm, and L, etc., some of the basic parameters listed in tables 6-1 to 6-2 are measured according to the labeling method shown in fig. 1, and the units of the basic parameters listed in tables 6-1 to 6-2 are millimeters (mm).
Examples/parameters EP01 CP1 EP12 CP2 EP23 CP3 EP34 CP4 L
2-1 0.978 0.016 0.387 0.016 0.351 0.016 0.469 0.350 3.840
2-2 0.977 0.016 0.356 0.016 0.433 0.016 0.469 0.300 3.870
TABLE 6-1
Examples/parameters D0m D0s d0m d0s D1s d1s d4s D4bm d4bm
2-1 6.470 3.890 6.087 1.879 3.273 1.709 3.323 5.516 3.673
2-2 6.630 4.918 6.327 1.779 2.453 1.695 3.263 5.516 3.573
TABLE 6-2
Fig. 8A shows on-axis aberration curves of the optical imaging systems 210 and 220 of the second embodiment, which represent the convergent focus deviations of light rays of different wavelengths after passing through the optical imaging systems 210 and 220. Fig. 8B shows astigmatism curves of the optical imaging systems 210 and 220 of the second embodiment, which represent meridional field curvature and sagittal field curvature corresponding to different image heights. Fig. 8C shows distortion curves of the optical imaging systems 210 and 220 of the second embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging systems 210 and 220 of the second embodiment, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging systems 210 and 220. As can be seen from fig. 8A to 8D, the optical imaging systems 210 and 220 according to the second embodiment can achieve good imaging quality.
Third embodiment
An optical imaging system according to a third embodiment of the present application is described below with reference to fig. 9 to 11D. Fig. 9 shows a schematic configuration of an optical imaging system 310 according to example 1 of a third embodiment of the present application; fig. 10 shows a schematic configuration of an optical imaging system 320 according to example 2 of a third embodiment of the present application.
As shown in fig. 9 and 10, each of the optical imaging systems 310 and 320 includes a lens barrel P0, and a five-piece lens group and a plurality of spacers disposed in the lens barrel P0, the five-piece lens group includes, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The stop STO may be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first separator P1, a second separator P2, a third separator P3, a fourth separator P4, and an auxiliary separator P4b. The spacers P1-P4 and the auxiliary spacer P4b can block the entry of external redundant light, so that the lens and the lens barrel P0 are better supported, and the structural stability of the optical imaging system is enhanced.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with positive refractive power has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The filter has an object side surface S11 and an image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order along the optical path M as shown in fig. 2 and is finally imaged on the imaging surface S13.
Table 7 shows a basic parameter table of the optical imaging system of the third embodiment in which the units of the radius of curvature, the thickness/distance, and the focal length are millimeters (mm).
Figure BDA0003907609750000131
TABLE 7
In this embodiment, the total effective focal length F of the optical imaging system is 3.82mm, the Semi-FOV of the maximum field angle of the optical imaging system is 40.8 °, and the relative F-number Fno of the optical imaging system is 2.30.
In the third embodiment, both 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. Tables 8-1 to 8-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S10 in the third embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
Figure BDA0003907609750000132
Figure BDA0003907609750000141
TABLE 8-1
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 3.6742E-06 1.5826E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 2.5790E-05 2.6209E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 1.6702E-05 2.6538E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 3.3475E-06 1.1623E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -5.5751E-05 4.8234E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S6 1.6759E-04 9.5041E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -2.6634E-04 -5.4605E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S8 -6.8138E-05 5.9647E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S9 7.3437E-04 1.0347E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S10 6.0700E-04 -9.9283E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 8-2
The optical imaging systems 310 and 320 in examples 1 and 2 of the third embodiment are different in the structural sizes of the lens barrel and the spacer included therein. Tables 9-1 to 9-2 show some basic parameters of the lens barrels and spacers of the optical imaging systems 310 and 320 of the third embodiment, such as EP01, CP1, EP12, CP2, EP23, CP3, EP34, CP4, D0m, D0s, D1s, D4bm, L, etc., some of the basic parameters listed in tables 9-1 to 9-2 are measured according to the labeling method shown in fig. 1, and the units of the basic parameters listed in tables 9-1 to 9-2 are millimeters (mm).
Examples/parameters EP01 CP1 EP12 CP2 EP23 CP3 EP34 CP4 L
3-1 0.990 0.016 0.423 0.016 0.304 0.016 0.708 0.229 3.840
3-2 0.990 0.016 0.356 0.016 0.412 0.016 0.600 0.288 3.940
TABLE 9-1
Examples/parameters D0m D0s d0m d0s D1s d1s d4s D4bm d4bm
3-1 6.430 3.890 6.127 1.879 3.073 1.709 3.573 5.516 3.946
3-2 6.630 4.818 6.027 2.173 2.325 1.724 3.661 5.316 4.015
TABLE 9-2
Fig. 11A shows on-axis aberration curves of the optical imaging systems 310 and 320 of the third embodiment, which represent the convergent focus deviations of light rays of different wavelengths after passing through the optical imaging systems 310 and 320. Fig. 11B shows astigmatism curves of the optical imaging systems 310 and 320 of the third embodiment, which represent meridional field curvature and sagittal field curvature corresponding to different image heights. Fig. 11C shows distortion curves of the optical imaging systems 310 and 320 of the third embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 11D shows a chromatic aberration of magnification curve of the optical imaging systems 310 and 320 of the third embodiment, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging systems 310 and 320. As can be seen from fig. 11A to 11D, the optical imaging systems 310 and 320 according to the third embodiment can achieve good imaging quality.
Fourth embodiment
An optical imaging system according to a fourth embodiment of the present application is described below with reference to fig. 12 to 14D. Fig. 12 shows a schematic structural diagram of an optical imaging system 410 according to example 1 of a fourth embodiment of the present application; fig. 13 shows a schematic structural diagram of an optical imaging system 420 according to example 2 of a fourth embodiment of the present application.
As shown in fig. 12 and 13, each of the optical imaging systems 410 and 420 includes a lens barrel P0, and a five-piece lens group and a plurality of spacers disposed in the lens barrel P0, the five-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The stop STO can be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4b. The spacers P1-P4 and the auxiliary spacer P4b can block the entry of external redundant light, so that the lens and the lens barrel P0 are better supported, and the structural stability of the optical imaging system is enhanced.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The filter has an object side surface S11 and an image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order along the optical path M as shown in fig. 2 and is finally imaged on the imaging surface S13.
Table 10 shows a basic parameter table of the optical imaging system of the fourth embodiment in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
Figure BDA0003907609750000151
Watch 10
In this embodiment, the total effective focal length F of the optical imaging system is 3.75mm, the Semi-FOV of the maximum field angle of the optical imaging system is 41.5 °, and the relative F-number Fno of the optical imaging system is 2.30.
In the fourth embodiment, both 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. Tables 11-1 to 11-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S10 in the fourth embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 5.0846E-02 4.5131E-03 1.2378E-03 2.0396E-04 4.7505E-05 7.4910E-06 6.7952E-06
S2 -3.1723E-02 6.4266E-03 2.5549E-03 3.9796E-05 -2.8941E-04 -1.7590E-05 -8.9287E-06
S3 -6.2032E-02 9.2052E-03 1.3761E-03 -5.4744E-04 -5.6507E-04 1.0125E-05 -6.7135E-06
S4 -3.1242E-02 1.2105E-02 2.0856E-04 -1.0874E-04 -4.6730E-04 2.9922E-05 -5.1578E-07
S5 -9.4344E-02 2.4370E-02 3.6465E-03 3.0484E-03 -3.1881E-04 -3.7275E-04 -9.6047E-05
S6 -3.1152E-01 1.4599E-02 2.3213E-03 6.7597E-03 3.0840E-03 1.2775E-03 5.0647E-04
S7 -3.2165E-01 -1.7309E-02 -5.1611E-03 -3.9365E-03 -7.0661E-04 -5.0567E-04 -3.1996E-04
S8 -8.4452E-02 6.7873E-02 -7.7494E-03 -1.0597E-02 2.0682E-03 1.1755E-03 -2.7562E-04
S9 -1.6029E+00 5.8524E-01 -1.4682E-01 3.1458E-02 -1.5726E-02 6.8044E-03 -8.7694E-04
S10 -1.7427E+00 3.3610E-01 -1.2058E-01 5.1669E-02 -1.7940E-02 8.0954E-03 -2.7027E-03
TABLE 11-1
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 7.5010E-07 6.6297E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 1.7261E-05 2.7268E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 8.2316E-06 2.5691E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 1.4964E-05 1.1207E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -8.8568E-06 4.2286E-05 6.5232E-06 5.7076E-06 -6.6058E-06 0.0000E+00 0.0000E+00
S6 2.0979E-04 8.5465E-05 3.7850E-05 3.8573E-06 1.2533E-05 -3.5772E-07 0.0000E+00
S7 -2.1503E-04 -4.1770E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S8 -2.4219E-04 8.3722E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S9 -2.8710E-04 4.1717E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S10 3.2090E-04 -5.7403E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 11-2
The optical imaging systems 410 and 420 in examples 1 and 2 of the fourth embodiment are different in the structural sizes of the lens barrel and the spacer included therein. Tables 12-1 to 12-2 show some basic parameters of the lens barrel and the spacer of the optical imaging systems 410 and 420 of the fourth embodiment, such as EP01, CP1, EP12, CP2, EP23, CP3, EP34, CP4, D0m, D0s, D1s, D4bm, L, etc., some of the basic parameters listed in tables 12-1 to 12-2 are measured according to the labeling method shown in fig. 1, and the units of the basic parameters listed in tables 12-1 to 12-2 are millimeters (mm).
Examples/parameters EP01 CP1 EP12 CP2 EP23 CP3 EP34 CP4 L
4-1 1.006 0.016 0.451 0.016 0.326 0.016 0.667 0.288 3.840
4-2 1.006 0.016 0.419 0.016 0.333 0.016 0.722 0.330 4.104
TABLE 12-1
Figure BDA0003907609750000161
Figure BDA0003907609750000171
TABLE 12-2
Fig. 14A shows on-axis aberration curves of the optical imaging systems 410 and 420 of the fourth embodiment, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging systems 410 and 420. Fig. 14B shows astigmatism curves of the optical imaging systems 410 and 420 of the fourth embodiment, which represent meridional field curvature and sagittal field curvature corresponding to different image heights. Fig. 14C shows distortion curves of the optical imaging systems 410 and 420 of the fourth embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging systems 410 and 420 of the fourth embodiment, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging systems 410 and 420. As can be seen from fig. 14A to 14D, the optical imaging systems 410 and 420 of the fourth embodiment can achieve good imaging quality.
In summary, the conditional expressions of each example of the first to fourth embodiments satisfy the relationship shown in table 13.
Conditions/examples 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2
TD/EP01+f/f1 4.41 4.54 4.45 4.45 4.41 4.41 4.26 4.26
(R2-R1)/(T12-CP1) 22.89 22.89 64.49 64.49 56.68 56.68 25.27 25.27
|f2/f|+EP12/CT2 3.80 3.98 3.79 3.65 3.81 3.53 4.33 4.18
(R3-R4)/(T23-CP2) 22.39 22.39 15.56 15.56 22.17 22.17 18.11 18.11
R5/(EP23+CT3) 6.57 6.07 7.11 6.40 5.20 4.55 5.93 5.87
|(CT3-T34)|/CP3+R6/R5 8.23 8.23 12.15 12.15 15.05 15.05 10.30 10.30
|R8/(EP34+CP4)| 1.85 1.97 3.29 3.51 3.73 3.95 2.77 2.51
T45/CP4+R9/d4s 2.21 2.08 3.09 3.47 3.39 2.82 4.08 3.61
f/L+D0m/D0s 2.57 2.28 2.66 2.34 2.65 2.35 2.63 2.54
Tan(Semi-FOV)×f/TD+d0m/d0s 4.27 4.47 4.21 4.53 4.26 3.77 4.27 4.35
Fno×(D1s/d1s) 4.81 3.53 4.40 3.33 4.14 3.10 4.35 3.22
|f5/(D4bm-d4bm)| 2.35 2.59 1.50 1.42 1.69 2.04 1.75 1.66
Watch 13
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 system described above.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of the above-described features, but also encompasses other combinations of any of the above-described features or their equivalents without departing from the spirit of the invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (12)

1. An optical imaging system, comprising:
the optical lens assembly comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
a plurality of spacers including at least a fourth spacer disposed between the fourth lens and the fifth lens and in contact with an image side surface of the fourth lens; and
a lens barrel in which the five-piece lens group and the plurality of spacers are disposed,
wherein an air interval T45 of the fourth lens and the fifth lens on the optical axis, a curvature radius R9 of an object-side surface of the fifth lens, a maximum thickness CP4 of the fourth spacer, and an inner diameter d4s of the object-side surface of the fourth spacer satisfy: 2.0 sT45/CP 4+ R9/d4s <4.5.
2. The optical imaging system of claim 1, wherein the plurality of spacers further includes a first spacer disposed between the first lens and the second lens and in contact with an image side surface of the first lens,
wherein an on-axis distance TD from an object side surface of the first lens to an image side surface of the fifth lens, an interval EP01 between a front end surface of the lens barrel and the first spacer along the optical axis, a total effective focal length f of the optical imaging system, and an effective focal length f1 of the first lens satisfy: 4.0 sP TD/EP01+ f/f1<5.0.
3. The optical imaging system according to claim 2, wherein a radius of curvature R1 of an object-side surface of the first lens, a radius of curvature R2 of an image-side surface of the first lens, an air interval T12 of the first lens and the second lens on the optical axis, and a maximum thickness CP1 of the first spacer satisfy: 22.5< (R2-R1)/(T12-CP 1) <65.0.
4. The optical imaging system of claim 2, wherein the relative F-number Fno of the optical imaging system, 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: 3.0 s are composed of (Fno x) (D1 s/D1 s) <5.0.
5. The optical imaging system of claim 2, wherein the plurality of spacers further includes a second spacer disposed between the second lens and the third lens and in contact with an image side surface of the second lens,
wherein an effective focal length f2 of the second lens, a total effective focal length f of the optical imaging system, a spacing EP12 of the first and second spacers along the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 3.5< | f2/f | + EP12/CT2<4.5.
6. The optical imaging system according to claim 5, wherein a radius of curvature R3 of an object-side surface of the second lens, a radius of curvature R4 of an image-side surface of the second lens, an air interval T23 of the second lens and the third lens on the optical axis, and a maximum thickness CP2 of the second spacer satisfy: 15.5< (R3-R4)/(T23-CP 2) <22.5.
7. The optical imaging system of claim 5, wherein the plurality of spacers further includes a third spacer disposed between the third lens and the fourth lens and in contact with an image side surface of the third lens,
wherein a radius of curvature R5 of an object-side surface of the third lens, a spacing EP23 of the second spacer and the third spacer along the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 4.5 are woven into (R5)/(EP 23+ CT 3) <7.5.
8. The optical imaging system of claim 7, wherein a center thickness CT3 of the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, a maximum thickness CP3 of the third spacer, a radius of curvature R5 of an object-side surface of the third lens, and a radius of curvature R6 of an image-side surface of the third lens satisfy: 8.0< | (CT 3-T34) |/CP3+ R6/R5<15.5.
9. The optical imaging system of claim 7, wherein a radius of curvature R8 of an image-side surface of the fourth lens, a spacing EP34 of the third spacer and the fourth spacer along the optical axis, and a maximum thickness CP4 of the fourth spacer satisfy: 1.5< | R8/(EP 34+ CP 4) | <4.0.
10. The optical imaging system according to claim 1, wherein a total effective focal length f of the optical imaging system, a length L of the lens barrel in a direction of the optical axis, an outer diameter D0s of a front end surface of the lens barrel, and an outer diameter D0m of a rear end surface of the lens barrel satisfy: 2.0 are woven as f/L + D0m/D0s <3.0.
11. The optical imaging system according to claim 1, wherein a Semi-FOV of a maximum field angle of the optical imaging system, a total effective focal length f of the optical imaging system, an on-axis distance TD from an object-side surface of the first lens to an image-side surface of the fifth lens, an inner diameter d0s of a front end surface of the lens barrel, and an inner diameter d0m of a rear end surface of the lens barrel satisfy: 3.5 sTan (Semi-FOV). Times.f/TD + d0m/d0s <5.0.
12. The optical imaging system of claim 1, wherein the plurality of spacers further includes an auxiliary spacer disposed between the fourth spacer and the fifth lens and having an object-side surface in contact with the fourth spacer and an image-side surface in contact with the fifth lens,
wherein an effective focal length f5 of the fifth lens, an outer diameter D4bm of an image side surface of the auxiliary spacer, and an inner diameter D4bm of the image side surface of the auxiliary spacer satisfy: 1.0 sP f5/(D4 bm-D4 bm) <3.0.
CN202222816357.XU 2022-10-25 2022-10-25 Optical imaging system Active CN218630326U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222816357.XU CN218630326U (en) 2022-10-25 2022-10-25 Optical imaging system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222816357.XU CN218630326U (en) 2022-10-25 2022-10-25 Optical imaging system

Publications (1)

Publication Number Publication Date
CN218630326U true CN218630326U (en) 2023-03-14

Family

ID=85471359

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202222816357.XU Active CN218630326U (en) 2022-10-25 2022-10-25 Optical imaging system

Country Status (1)

Country Link
CN (1) CN218630326U (en)

Similar Documents

Publication Publication Date Title
CN111399181A (en) Optical imaging lens
CN113960754B (en) Optical imaging lens
CN215067498U (en) Optical imaging lens
CN113484993B (en) Optical imaging lens
CN212111953U (en) Optical imaging lens
CN218630326U (en) Optical imaging system
CN114488486A (en) Optical imaging system
CN218601545U (en) Image pickup apparatus
CN218938629U (en) Optical imaging lens
CN218848422U (en) Optical imaging system
CN218630325U (en) Optical imaging lens
CN218601564U (en) Optical imaging system
CN218675438U (en) Optical imaging system
CN219435127U (en) Optical imaging system
CN218601560U (en) Imaging system
CN219978610U (en) Optical imaging system
CN218601565U (en) Optical imaging lens
CN218956895U (en) Optical imaging lens
CN117930462A (en) Optical imaging system
CN219179686U (en) Image pickup lens
CN216411712U (en) Photographic lens
CN218601552U (en) Optical imaging lens
CN214122554U (en) Optical imaging system
CN218601553U (en) Optical imaging lens
CN218647227U (en) Optical lens

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant