CN216526500U - Optical imaging lens group - Google Patents
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- CN216526500U CN216526500U CN202220048795.3U CN202220048795U CN216526500U CN 216526500 U CN216526500 U CN 216526500U CN 202220048795 U CN202220048795 U CN 202220048795U CN 216526500 U CN216526500 U CN 216526500U
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Abstract
The application discloses an optical imaging lens group, which sequentially comprises a first lens group consisting of a first lens, a second lens and a third lens and a second lens group consisting of a fourth lens and a fifth lens from an object side to an image side along an optical axis, wherein the third lens has positive refractive power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the maximum optical distortion Dist of the optical imaging lens group satisfies: l Dist. | < 2.5%; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis, the half ImgH of the diagonal length of the effective pixel area on the imaging surface, the effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group meet the following requirements: TTL/ImgH + f/EPD is less than 4.2; and an air interval T12 of the first lens and the second lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.3< (T34+ T45)/T12< 1.3.
Description
Technical Field
The application relates to the field of optical elements, in particular to an optical imaging lens group.
Background
With the development of science and technology, electronic products with a camera function are rapidly developed, and people have higher requirements on the aspects of ultrathin, miniaturization, high imaging effect and the like of an optical imaging lens group suitable for portable electronic products. Wide-angle lenses with large field angles in the market have large distortion, and the edges of shot pictures can be deformed. How to miniaturize an optical imaging lens assembly mounted on a portable electronic product on the premise of good imaging quality is one of the problems to be solved by many lens designers at present.
SUMMERY OF THE UTILITY MODEL
The application provides an optical imaging lens group, which comprises a first lens group consisting of a first lens, a second lens and a third lens, and a second lens group consisting of a fourth lens and a fifth lens in sequence from an object side to an image side along an optical axis, wherein the third lens has positive refractive power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the maximum optical distortion dist of the optical imaging lens group satisfies: l Dist. | < 2.5%; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis, the half ImgH of the diagonal length of the effective pixel area on the imaging surface, the effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group meet the following requirements: TTL/ImgH + f/EPD is less than 4.2; and an air interval T12 of the first lens and the second lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.3< (T34+ T45)/T12< 1.3.
In one embodiment, the TV distortion TVD of the optical imaging lens group satisfies: | TVD | < 2.5%.
In one embodiment, the maximum field angle FOV of the optical imaging lens group satisfies: 85 ° < FOV <100 °.
In one embodiment, the effective focal length Fa of the first lens group and the effective focal length Fb of the second lens group satisfy: -5.0< Fb/Fa < -3.0.
In one embodiment, the abbe number V1 of the first lens, the abbe number V2 of the second lens and the abbe number V3 of the third lens satisfy: v1>40, V2>40 and V3> 40.
In one embodiment, the abbe number V4 of the fourth lens and the abbe number V5 of the fifth lens satisfy: v4<20 and V5< 20.
In one embodiment, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy: n4>1.6 and N5> 1.6.
In one embodiment, the effective focal length f of the optical imaging lens group and the effective focal length f1 of the first lens satisfy: 0< f/f1< 1.0.
In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.5< (CT2+ CT3)/CT1< 2.5.
In one embodiment, the effective focal length f3 of the third lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy: -0.7< (R5+ R6)/f3< 0.
In one embodiment, the effective focal length f5 of the fifth lens, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: -0.5< (R9+ R10)/f5< 0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R7 of the object-side surface of the fourth lens, and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: -1.0< (R7+ R8)/R1< 0.
In one embodiment, an optical imaging lens group according to the present application may satisfy: 0.3< ATmax/Δ DTmax <0.8, wherein any two adjacent lenses of the first lens to the fifth lens have an air space on an optical axis, and ATmax is a maximum value of the air space; and Δ DTmax is the maximum value among absolute values of differences between the maximum effective radii of two adjacent surfaces of any two adjacent lenses among the first lens to the fifth lens.
In one embodiment, the maximum effective radius DT41 of the object side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens, the edge thickness ET1 of the first lens, and the edge thickness ET5 of the fifth lens satisfy: 4.0< DT41/ET1+ DT51/ET5< 5.0.
In one embodiment, an on-axis distance SAG32 between an intersection point of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens, an on-axis distance SAG41 between an intersection point of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens, and an on-axis distance SAG42 between an intersection point of the image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens satisfy: 1.5< (SAG32+ SAG41)/SAG42< 2.5.
In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness DT12 of the first lens, and the maximum effective radius DT21 of the object side surface of the second lens satisfy: 0.5< (ET2/DT21)/(ET1/DT12) < 1.5.
In one embodiment, the first lens element with positive refractive power has a convex object-side surface; the fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface.
This application adopts five lens, through the epaxial interval etc. of refractive power, face type, the central thickness of each lens and each lens of rational distribution each lens for above-mentioned optical imaging lens group has at least one beneficial effect such as low aberration, high resolution, low distortion factor, miniaturization, high imaging quality.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic structural view of an optical imaging lens group according to embodiment 1 of the present application;
fig. 2A to 2E show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of embodiment 1;
fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application;
fig. 4A to 4E show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of embodiment 2;
fig. 5 is a schematic view showing a structure of an optical imaging lens group according to embodiment 3 of the present application;
fig. 6A to 6E show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of embodiment 3;
fig. 7 is a schematic view showing a structure of an optical imaging lens group according to embodiment 4 of the present application;
fig. 8A to 8E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of embodiment 4;
fig. 9 is a schematic view showing a structure of an optical imaging lens group according to embodiment 5 of the present application;
fig. 10A to 10E show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of example 5;
fig. 11 is a schematic view showing a structure of an optical imaging lens group according to embodiment 6 of the present application;
fig. 12A to 12E show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of embodiment 6;
fig. 13 is a schematic view showing a structure of an optical imaging lens group according to embodiment 7 of the present application; and
fig. 14A to 14E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and TV distortion, respectively, of the optical imaging lens group of example 7.
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. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present 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.
The optical imaging lens group according to the exemplary embodiment of the present application may include five lenses with refractive power, namely, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The five lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the fifth lens can have a spacing distance therebetween.
In an exemplary embodiment, the front lens group includes a first lens, a second lens, and a third lens, and the rear lens group includes a fourth lens and a fifth lens. Wherein the first lens element has positive refractive power or negative refractive power; the second lens element with positive or negative refractive power; the third lens element with negative refractive power has a concave object-side surface and a convex image-side surface; the fourth lens element with positive or negative refractive power has a concave object-side surface and a convex image-side surface; and the fifth lens element with positive or negative refractive power. By reasonably controlling the positive and negative distribution of the refractive power of each lens of the optical imaging lens group, the low-order aberration of the optical imaging lens group can be effectively controlled in a balanced manner, the sensitivity of tolerance can be reduced, and the miniaturization of the system can be maintained.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: l Dist | < 2.5%, wherein Dist is the maximum optical distortion of the optical imaging lens group. More specifically, dist further can satisfy: l Dist. | < 2.1%. Satisfy | Dist | < 2.5%, be favorable to promoting the performance of the marginal visual field of optical imaging lens group.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: TTL/ImgH + f/EPD <4.2, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, f is the effective focal length of the optical imaging lens group, and EPD is the entrance pupil diameter of the optical imaging lens group. The TTL/ImgH + f/EPD <4.2 is satisfied, the size of the optical imaging lens group is reduced, and the ultra-thinning of the optical imaging lens group is realized.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: TTL/ImgH <1.6, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface. The requirements of TTL/ImgH <1.6 are met, the size of the optical imaging lens group is favorably compressed, and the ultrathin characteristic of the optical imaging lens group is ensured so as to meet the requirement of miniaturization of the optical imaging lens group.
The optical imaging lens group according to the present application can have a smaller total optical length with a large image plane, for example, TTL can satisfy 4.17mm < TTL <4.21 mm.
In an exemplary embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH < 2.64mm < 2.76 mm.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3< (T34+ T45)/T12<1.3, wherein T12 is an air space on the optical axis of the first lens and the second lens, T34 is an air space on the optical axis of the third lens and the fourth lens, and T45 is an air space on the optical axis of the fourth lens and the fifth lens. More specifically, T12, T34, and T45 may further satisfy: 0.6< (T34+ T45)/T12< 1.0. The optical imaging lens group satisfies 0.3< (T34+ T45)/T12<1.3, and is beneficial to effectively ensuring the field curvature of the optical imaging lens group, so that the off-axis field of view of the optical imaging lens group obtains good imaging quality.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: l TVD | < 2.5%, where TVD is the TV distortion of the optical imaging lens group. More specifically, the TVD may further satisfy: | TVD | < 2.1%. Satisfy | Dist | < 2.5%, be favorable to reducing the TV distortion of optical imaging lens group, improve the deflection of user's corner picture in the actual shooting process, realize high-quality imaging requirement.
In an exemplary embodiment, an optical imaging lens group according to the present application further includes a stop disposed between the object side and the first lens.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 85 ° < FOV <100 °, where FOV is the maximum field angle of the optical imaging lens group. More specifically, the FOV may further satisfy: 89 < FOV < 94. The wide-angle optical imaging lens group satisfies 85 degrees < FOV <100 degrees, is beneficial to enabling the maximum field angle of the optical imaging lens group to be larger than 90 degrees, and realizes the wide-angle characteristic of the optical imaging lens group.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -5.0< Fb/Fa < -3.0, wherein Fa is the effective focal length of the first lens group and Fb is the effective focal length of the second lens group. More specifically, Fa and Fb further satisfy: -4.7< Fb/Fa < -3.5. Satisfies-5.0 < Fb/Fa < -3.0, and is beneficial to the optical imaging lens group to realize the characteristic of a wide-angle lens.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: v1>40, V2>40 and V3>40, where V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens and V3 is the Abbe number of the third lens. Satisfying V1>40, V2>40 and V3>40 is beneficial to controlling the dispersion coefficients of the first lens, the second lens and the third lens in the first lens group, so that the light rays with different wavelengths in the first lens group are diverged.
In exemplary embodiments, an optical imaging lens group according to the present application may satisfy: v4<20 and V5<20, where V4 is the abbe number of the fourth lens and V5 is the abbe number of the fifth lens. The requirements of V4<20 and V5<20 are met, and the dispersion coefficients of the fourth lens and the fifth lens in the second lens group are favorably controlled, so that the light rays with different wavelengths in the second lens group are converged, and the chromatic aberration of the whole optical imaging lens group is controlled.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: n4>1.6 and N5>1.6, where N4 is the refractive index of the fourth lens and N5 is the refractive index of the fifth lens. The requirements of N4>1.6 and N5>1.6 are favorable for controlling the refractive indexes of the fourth lens and the fifth lens in the second lens group, the refraction angle of the light is increased, and the light is better converged.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0< f/f1<1.0, where f is the effective focal length of the optical imaging lens group and f1 is the effective focal length of the first lens. More specifically, f and f1 further satisfy: 0.3< f/f1< 0.9. The optical imaging lens group has the advantages that the requirement that f/f1 is 0< 1.0 is met, the contribution of the effective focal length of the optical imaging lens group and the curvature radius of the object side surface of the first lens is favorably controlled, the contribution of the effective focal length of the optical imaging lens group and the curvature radius of the object side surface of the first lens is controlled, and further the third-order spherical aberration generated by the lens is compensated, so that the optical imaging lens group has good imaging quality on the optical axis.
In exemplary embodiments, an optical imaging lens group according to the present application may satisfy: 1.5< (CT2+ CT3)/CT1<2.5, wherein CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. More specifically, CT1, CT2, and CT3 may further satisfy: 1.9< (CT2+ CT3)/CT1< 2.3. Satisfies 1.5< (CT2+ CT3)/CT1<2.5, and is beneficial to reducing distortion of each field of view of the optical imaging lens group.
In exemplary embodiments, an optical imaging lens group according to the present application may satisfy: -0.7< (R5+ R6)/f3<0, wherein f3 is the effective focal length of the third lens, R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens. More specifically, f3, R5, and R6 may further satisfy: -0.7< (R5+ R6)/f3< -0.3. The optical imaging lens group satisfies-0.7 < (R5+ R6)/f3<0, is beneficial to effectively controlling the astigmatism of the optical imaging lens group, and further can improve the imaging quality of an off-axis visual field.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -0.5< (R9+ R10)/f5<0, wherein f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object-side surface of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens. More specifically, f5, R9, and R10 may further satisfy: -0.3< (R9+ R10)/f5< -0.1. The optical imaging lens group satisfies-0.5 < (R9+ R10)/f5<0, is beneficial to effectively controlling the astigmatism of the optical imaging lens group, and further can improve the imaging quality of an off-axis visual field.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.0< (R7+ R8)/R1<0, wherein R1 is the radius of curvature of the object-side surface of the first lens, R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens. More specifically, R1, R7, and R8 may further satisfy: -0.8< (R7+ R8)/R1< -0.6. The optical imaging lens group satisfies-1.0 < (R7+ R8)/R1<0, which is beneficial to effectively controlling the refractive power of the fourth lens of the optical imaging lens group, so that the light of the optical imaging lens group can be better deflected at the fourth lens, and a better imaging effect can be obtained.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3< ATmax/Δ DTmax <0.8, wherein any two adjacent lenses of the first lens to the fifth lens have an air space on the optical axis, and ATmax is the maximum value of the air space; Δ DTmax is a maximum value among absolute values of differences between maximum effective radii of two adjacent surfaces of any two adjacent lenses of the first to fifth lenses, that is, Δ DTmax is a maximum value among an absolute value of a difference between a maximum effective radius of an image-side surface of the first lens and a maximum effective radius of an object-side surface of the second lens, an absolute value of a difference between a maximum effective radius of an image-side surface of the second lens and a maximum effective radius of an object-side surface of the third lens, an absolute value of a difference between a maximum effective radius of an image-side surface of the third lens and a maximum effective radius of an object-side surface of the fourth lens, and an absolute value of a difference between a maximum effective radius of an image-side surface of the fourth lens and a maximum effective radius of an object-side surface of the fifth lens. More specifically, ATmax and Δ DTmax may further satisfy: 0.3< ATmax/Δ DTmax < 0.8. Satisfying 0.3< ATmax/Δ DTmax <0.8 is advantageous for manufacturing the assembly between the lenses.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 4.0< DT41/ET1+ DT51/ET5<5.0, where DT41 is the maximum effective radius of the object side of the fourth lens, DT51 is the maximum effective radius of the object side of the fifth lens, ET1 is the edge thickness of the first lens, and ET5 is the edge thickness of the fifth lens. More specifically, DT41, DT51, ET1, and ET5 may further satisfy: 4.6< DT41/ET1+ DT51/ET5< 4.8. The condition that < 4.0< DT41/ET1+ DT51/ET5<5.0 is met, the risk of generating weld marks on the lens is reduced, and the assembling strength is increased.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1.5< (SAG32+ SAG41)/SAG42<2.5, wherein SAG32 is an on-axis distance from an intersection point of an image side surface and an optical axis of the third lens to an effective radius vertex of the image side surface of the third lens, SAG41 is an on-axis distance from an intersection point of an object side surface and the optical axis of the fourth lens to an effective radius vertex of an object side surface of the fourth lens, and SAG42 is an on-axis distance from an intersection point of the image side surface and the optical axis of the fourth lens to an effective radius vertex of the image side surface of the fourth lens. More specifically, SAG32, SAG41, and SAG42 may further satisfy: 1.9< (SAG32+ SAG41)/SAG42< 2.3. The requirement 1.5< (SAG32+ SAG41)/SAG42<2.5 is favorable for reasonably controlling the distortion of the optical imaging lens group, so that the optical imaging lens group has good distortion performance.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5< (ET2/DT21)/(ET1/DT12) <1.5, wherein ET1 is the edge thickness of the first lens, ET2 is the edge thickness of the second lens, DT12 is the edge thickness of the first lens, and DT21 is the maximum effective radius of the object-side face of the second lens. More specifically, ET1, ET2, DT12, and DT21 may further satisfy: 0.9< (ET2/DT21)/(ET1/DT12) < 1.2. Satisfying 0.5< (ET2/DT21)/(ET1/DT12) <1.5 is advantageous for making the optical imaging lens group more manufacturable.
In an exemplary embodiment, the first lens element with positive refractive power has a convex object-side surface, which is advantageous for correcting distortion; the fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface, and the low-order aberration of the optical imaging lens assembly is effectively balanced and controlled by reasonably controlling the positive and negative distribution of the refractive power of each lens element of the optical imaging lens assembly, so that the tolerance sensitivity can be reduced, and the miniaturization of the optical imaging lens assembly can be maintained.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: f/EPD < 2.60, wherein f is the effective focal length of the optical imaging lens group, and EPD is the entrance pupil diameter of the optical imaging lens group. The optical imaging lens group satisfies the F/EPD < 2.60, is beneficial to reducing the F number of the optical imaging lens group, enlarging the aperture, increasing the light inlet quantity, enhancing the imaging effect in a dark environment and simultaneously reducing the aberration of the marginal field.
In an exemplary embodiment, the effective focal length f1 of the first lens may be, for example, in the range of 2.93mm to 5.76mm, the effective focal length f2 of the second lens may be, for example, in the range of-28.51 mm to 8.11mm, the effective focal length f3 of the third lens may be, for example, in the range of 4.67mm to 6.72mm, the effective focal length f4 of the fourth lens may be, for example, in the range of-54.00 mm to 16.23mm, the effective focal length f5 of the fifth lens may be, for example, in the range of-12.45 mm to-6.00 mm, and the effective focal length f of the optical imaging lens group may be, for example, in the range of 2.60mm to 2.66 mm.
In an exemplary embodiment, an optical imaging lens group according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an optical imaging lens group with continuously variable refractive power. The optical imaging lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above five lenses. By reasonably distributing the refractive power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like of each lens, the low-order aberration of the optical imaging lens group can be effectively balanced and controlled, meanwhile, the tolerance sensitivity can be reduced, and the miniaturization of the optical imaging lens group can be kept.
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 a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatism 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. Optionally, the object-side surface and the image-side surface of each of the first lens to the fifth lens are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical imaging lens group is not limited to include five lenses. The optical imaging lens group may also include other numbers of lenses, if desired.
Specific examples of the optical imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2E. Fig. 1 shows a schematic structural diagram of an optical imaging lens group according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive 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 concave object-side surface S5 and a convex 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. Filter E6 has an object side S11 and an image side S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.60mm, the effective focal length f1 of the first lens of the optical imaging lens group is 5.52mm, the effective focal length f2 of the second lens is 7.93mm, the effective focal length f3 of the third lens is 5.05mm, the effective focal length f4 of the fourth lens is 14.02mm, the effective focal length f5 of the fifth lens is-6.50 mm, the total length of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.18mm, half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.75mm, half of the maximum field angle Semi-FOV of the optical imaging lens group is 93.3 °, the ratio f/imp of the effective focal length f of the optical imaging lens group to the lens group entrance pupil diameter EPD of the optical imaging is 2.40.
Table 1-1 shows a basic parameter table of the optical imaging lens group of example 1, in which the radius of curvature and the thickness are both in units of millimeters (mm).
TABLE 1
In embodiment 1, 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:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S10 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | -1.7973E-02 | -1.6318E-03 | -2.5491E-04 | -4.5526E-05 | -8.7569E-06 | 2.2349E-06 | 5.0194E-07 | 2.5745E-06 | -2.3623E-07 |
| S2 | -1.1824E-01 | -1.2899E-03 | -5.9814E-04 | -1.4769E-04 | -4.2823E-05 | 1.8804E-05 | 1.0046E-05 | 2.9553E-06 | -1.3906E-07 |
| S3 | -1.3167E-01 | -1.9626E-02 | 4.5834E-04 | -1.0583E-03 | -5.3363E-05 | -8.8142E-06 | 8.3754E-05 | 3.9890E-05 | 1.0803E-05 |
| S4 | -1.2284E-01 | -3.1241E-02 | -7.6439E-03 | -1.4454E-04 | 1.6576E-03 | 5.4966E-04 | -2.5183E-04 | -5.3241E-05 | -6.1448E-07 |
| S5 | 1.0510E-01 | 1.4084E-03 | -9.0302E-03 | 2.8511E-03 | 2.2890E-03 | 2.7805E-05 | -7.2259E-04 | -4.9207E-05 | 6.7080E-05 |
| S6 | -1.9774E-01 | 7.4623E-02 | -3.0964E-02 | 1.8984E-02 | -8.2591E-03 | 5.1490E-03 | -2.5119E-03 | 3.6803E-04 | -3.0175E-04 |
| S7 | 7.2642E-02 | 5.2228E-02 | -1.8638E-02 | 1.9181E-02 | -6.6560E-03 | 5.1266E-03 | -2.3164E-03 | 5.0625E-04 | -2.6530E-04 |
| S8 | 2.2629E-01 | 3.2069E-02 | 8.4265E-03 | 4.4414E-03 | -6.6770E-04 | 6.0463E-04 | -3.5928E-04 | 1.4264E-04 | 4.9324E-05 |
| S9 | -1.3424E+00 | 1.4090E-01 | -2.9741E-02 | 4.8276E-03 | -2.9235E-04 | -1.0281E-04 | 7.4994E-04 | 1.1226E-04 | 3.9452E-05 |
| S10 | -4.1269E+00 | 3.4918E-01 | -1.9448E-01 | 3.4578E-02 | -2.1927E-02 | 5.0531E-03 | -2.5924E-03 | 4.2410E-04 | -2.7227E-04 |
TABLE 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens group of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 1, which represents a deviation of different image heights on an imaging surface after light passes through the lens. Fig. 2E shows TV distortion of the optical imaging lens group of embodiment 1, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 2A to 2E, the optical imaging lens assembly according to embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4E. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive 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 concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with negative 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. Filter E6 has an object side S11 and an image side S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.64mm, the effective focal length f1 of the first lens of the optical imaging lens group is 5.74mm, the effective focal length f2 of the second lens is 7.28mm, the effective focal length f3 of the third lens is 4.68mm, the effective focal length f4 of the fourth lens is-53.99 mm, the effective focal length f5 of the fifth lens is-12.40 mm, the total length TTL of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.20mm, the ImgH of the half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.75mm, the semifov of the maximum field angle of view of the optical imaging lens group is 92.3 °, the ratio f/EPD of the effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.40.
Table 3 shows a basic parameter table of the optical imaging lens group of embodiment 2, in which the radius of curvature and the thickness are both in millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 3
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | -1.7828E-02 | -1.5796E-03 | -2.3966E-04 | -3.9071E-05 | -1.2947E-05 | 3.2594E-07 | -1.4882E-06 | 3.0796E-06 | -3.1675E-09 |
| S2 | -1.1857E-01 | -6.0831E-04 | -5.0742E-04 | -1.4511E-04 | -4.9248E-05 | 4.2742E-06 | 9.0915E-06 | 2.0714E-06 | -9.7222E-07 |
| S3 | -1.2791E-01 | -1.8574E-02 | 4.9647E-04 | -1.1235E-03 | -1.1823E-04 | -5.6323E-05 | 6.5831E-05 | 3.7466E-05 | 1.3436E-05 |
| S4 | -1.2368E-01 | -3.2178E-02 | -7.4769E-03 | -3.0618E-04 | 1.6304E-03 | 5.6465E-04 | -1.6950E-04 | -2.3545E-05 | 4.2150E-06 |
| S5 | 1.0348E-01 | 1.9488E-03 | -8.6897E-03 | 3.1075E-03 | 2.3135E-03 | 1.2603E-04 | -6.5302E-04 | -2.7866E-05 | 5.4471E-05 |
| S6 | -1.9072E-01 | 7.7377E-02 | -3.1760E-02 | 1.9873E-02 | -8.1665E-03 | 5.0148E-03 | -2.5461E-03 | 4.7345E-04 | -3.1073E-04 |
| S7 | 9.4328E-02 | 4.7007E-02 | -1.8032E-02 | 2.0180E-02 | -6.3542E-03 | 5.0328E-03 | -2.5688E-03 | 5.5430E-04 | -3.5108E-04 |
| S8 | 1.4834E-01 | 2.7793E-02 | 8.3797E-03 | 5.2235E-03 | -5.5856E-04 | 6.4449E-04 | -5.4777E-04 | 1.9113E-04 | -1.3117E-05 |
| S9 | -1.3683E+00 | 1.3794E-01 | -2.6081E-02 | 4.0710E-03 | -4.0396E-04 | -7.3694E-05 | 3.8633E-04 | 1.5532E-04 | -1.5604E-05 |
| S10 | -4.2009E+00 | 3.3865E-01 | -1.9254E-01 | 3.0597E-02 | -2.0297E-02 | 4.0019E-03 | -2.2546E-03 | 2.3548E-04 | -2.1741E-04 |
TABLE 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 2, which represents a deviation of different image heights on an imaging surface after light passes through the lens. Fig. 4E shows TV distortion of the optical imaging lens group of embodiment 2, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 4A to 4E, the optical imaging lens group according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6E. Fig. 5 shows a schematic structural view of an optical imaging lens group according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive 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 concave object-side surface S5 and a convex 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. Filter E6 has an object side S11 and an image side S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.64mm, the effective focal length f1 of the first lens of the optical imaging lens group is 5.41mm, the effective focal length f2 of the second lens is 8.10mm, the effective focal length f3 of the third lens is 5.08mm, the effective focal length f4 of the fourth lens is 14.53mm, the effective focal length f5 of the fifth lens is-6.13 mm, the total length of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.20mm, half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.75mm, half of the maximum field angle Semi-FOV of the optical imaging lens group is 92.3 °, the ratio f/imp of the effective focal length f of the optical imaging lens group to the lens group entrance pupil diameter EPD of the optical imaging is 2.50.
Table 5 shows a basic parameter table of the optical imaging lens group of embodiment 3, in which the radius of curvature and the thickness are both in millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 5
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 3, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens group of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 3, which represents a deviation of different image heights on an imaging surface after light passes through the lens. Fig. 6E shows TV distortion of the optical imaging lens group of embodiment 3, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 6A to 6E, the optical imaging lens group according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8E. Fig. 7 shows a schematic structural diagram of an optical imaging lens group according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive 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 concave object-side surface S5 and a convex 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. Filter E6 has an object side S11 and an image side S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.64mm, the effective focal length f1 of the first lens of the optical imaging lens group is 5.41mm, the effective focal length f2 of the second lens is 8.08mm, the effective focal length f3 of the third lens is 5.10mm, the effective focal length f4 of the fourth lens is 14.55mm, the effective focal length f5 of the fifth lens is-6.14 mm, the total length of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.20mm, half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.65mm, half of the maximum field angle Semi-FOV of the optical imaging lens group is 90.0 °, and the ratio f/im of the effective focal length f to the lens group entrance pupil diameter EPD of the optical imaging is 2.40.
Table 7 shows a basic parameter table of the optical imaging lens group of embodiment 4, in which the radius of curvature and the thickness are both in millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | -1.7967E-02 | -1.6720E-03 | -2.6764E-04 | -4.8884E-05 | -1.3826E-05 | -9.3833E-07 | -2.0159E-06 | 2.2357E-06 | -1.7176E-07 |
| S2 | -1.1737E-01 | -1.3692E-03 | -6.0718E-04 | -1.2298E-04 | -6.3704E-05 | 7.2326E-06 | 4.6176E-06 | 2.1306E-06 | -8.3832E-07 |
| S3 | -1.2955E-01 | -1.9023E-02 | 6.7573E-04 | -9.5191E-04 | -7.7685E-05 | -6.1027E-05 | 5.3522E-05 | 2.8737E-05 | 9.5172E-06 |
| S4 | -1.1977E-01 | -3.0468E-02 | -7.7644E-03 | -6.6783E-05 | 1.6405E-03 | 5.1964E-04 | -2.1940E-04 | -3.8649E-05 | 4.7118E-06 |
| S5 | 1.0385E-01 | 9.7211E-04 | -9.2657E-03 | 2.8260E-03 | 2.3537E-03 | 1.0964E-04 | -6.5441E-04 | -3.9545E-05 | 6.1642E-05 |
| S6 | -1.9396E-01 | 7.5315E-02 | -3.0831E-02 | 1.8825E-02 | -8.1831E-03 | 5.1563E-03 | -2.5335E-03 | 4.3071E-04 | -2.9004E-04 |
| S7 | 7.1983E-02 | 5.0984E-02 | -1.9666E-02 | 1.8960E-02 | -6.7510E-03 | 5.2353E-03 | -2.4633E-03 | 5.5465E-04 | -3.0287E-04 |
| S8 | 2.2463E-01 | 3.0189E-02 | 8.1011E-03 | 4.6280E-03 | -4.8114E-04 | 8.2443E-04 | -4.7453E-04 | 1.7055E-04 | -4.9680E-06 |
| S9 | -1.3495E+00 | 1.3422E-01 | -2.8674E-02 | 5.1359E-03 | 9.0274E-04 | 1.8995E-04 | 9.3046E-04 | 7.7221E-05 | 6.8145E-06 |
| S10 | -4.1664E+00 | 3.4981E-01 | -1.9787E-01 | 3.5544E-02 | -2.2191E-02 | 5.1259E-03 | -2.7623E-03 | 4.2540E-04 | -2.7249E-04 |
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 4, which represents a deviation of different image heights on the imaging surface after light passes through the lens. Fig. 8E shows TV distortion of the optical imaging lens group of embodiment 4, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 8A to 8E, the optical imaging lens group according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10E. Fig. 9 shows a schematic structural view of an optical imaging lens group according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
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 positive 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 concave object-side surface S5 and a convex 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. Filter E6 has an object side S11 and an image side S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.65mm, the effective focal length f1 of the first lens of the optical imaging lens group is 7.54mm, the effective focal length f2 of the second lens is 5.50mm, the effective focal length f3 of the third lens is 5.14mm, the effective focal length f4 of the fourth lens is 14.86mm, the effective focal length f5 of the fifth lens is-6.18 mm, the total length of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.19mm, half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.75mm, half of the maximum field angle Semi-FOV of the optical imaging lens group is 92.3 °, the ratio f/imp of the effective focal length f of the optical imaging lens group to the lens group entrance diameter EPD of the optical imaging is 2.40.
Table 9 shows a basic parameter table of the optical imaging lens group of example 5, in which the radius of curvature and the thickness are both in millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 9
TABLE 10
Fig. 10A shows on-axis chromatic aberration curves of the optical imaging lens group of embodiment 5, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens group of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 5, which represents a deviation of different image heights on an imaging surface after light passes through the lens. Fig. 10E shows TV distortion of the optical imaging lens group of example 5, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 10A to 10E, the optical imaging lens group according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12E. Fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging lens assembly includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with negative refractive power has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 with positive refractive power has a concave object-side surface S5 and a convex 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. Filter E6 has an object side S11 and an image side S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.62mm, the effective focal length f1 of the first lens of the optical imaging lens group is 2.94mm, the effective focal length f2 of the second lens is-28.50 mm, the effective focal length f3 of the third lens is 5.19mm, the effective focal length f4 of the fourth lens is 16.22mm, the effective focal length f5 of the fifth lens is-6.69 mm, the total length TTL of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.20mm, the ImgH of the half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.75mm, the semifov of the maximum field angle of view of the optical imaging lens group is 92.2 °, the ratio f/EPD of the effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.40.
Table 11 shows a basic parameter table of the optical imaging lens group of example 6, in which the radius of curvature and the thickness are both in millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 11
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | -1.9208E-02 | -2.4643E-03 | -4.9303E-04 | -1.2180E-04 | -2.7283E-05 | -2.7497E-06 | 2.9576E-06 | 4.1322E-06 | 8.3249E-07 |
| S2 | -1.4081E-01 | 1.7568E-03 | -2.4255E-03 | 5.8000E-05 | -1.2942E-04 | 1.9760E-05 | 5.9852E-06 | 5.3231E-06 | 3.8725E-07 |
| S3 | -1.2574E-01 | -1.1127E-02 | -1.7245E-03 | -7.3508E-04 | -1.1417E-04 | -3.9731E-05 | 2.8630E-05 | 2.0470E-05 | 8.3022E-06 |
| S4 | -1.0786E-01 | -2.8731E-02 | -6.7769E-03 | -4.0727E-04 | 9.5104E-04 | 5.4068E-04 | -9.4557E-05 | -2.0142E-05 | -2.8309E-05 |
| S5 | 9.8214E-02 | 2.6735E-03 | -6.7131E-03 | 1.1488E-03 | 1.3340E-03 | 5.5699E-04 | -3.4168E-04 | -5.2465E-05 | 5.9416E-07 |
| S6 | -1.8991E-01 | 6.6812E-02 | -2.9938E-02 | 1.8300E-02 | -7.5659E-03 | 4.6698E-03 | -1.8801E-03 | 6.0093E-04 | -1.1781E-04 |
| S7 | 4.6089E-02 | 4.5762E-02 | -2.0455E-02 | 1.8488E-02 | -5.8769E-03 | 4.6008E-03 | -1.9752E-03 | 5.7305E-04 | -1.4157E-04 |
| S8 | 2.2692E-01 | 3.0082E-02 | 8.5332E-03 | 4.4147E-03 | -2.7939E-04 | 2.3001E-04 | -4.6684E-04 | 9.1639E-05 | 4.1328E-05 |
| S9 | -1.4260E+00 | 1.6306E-01 | -2.9772E-02 | 6.9432E-03 | -1.6168E-03 | -4.8536E-04 | 8.3921E-04 | -1.1472E-04 | 1.4934E-04 |
| S10 | -4.2904E+00 | 3.4146E-01 | -2.0655E-01 | 3.3034E-02 | -2.6179E-02 | 5.2046E-03 | -3.5401E-03 | 6.4266E-04 | -4.2508E-04 |
TABLE 12
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 6, which represents a deviation of different image heights on an imaging surface after light passes through the lens. Fig. 12E shows TV distortion of the optical imaging lens group of example 6, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 12A to 12E, the optical imaging lens group according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14E. Fig. 13 shows a schematic structural diagram of an optical imaging lens group according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.
The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 with positive refractive power has a concave object-side surface S5 and a convex 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. Filter E6 has an object side S11 and an image side S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
In the present example, the effective focal length f of the optical imaging lens group is 2.64mm, the effective focal length f1 of the first lens of the optical imaging lens group is 5.75mm, the effective focal length f2 of the second lens is 5.15mm, the effective focal length f3 of the third lens is 6.71mm, the effective focal length f4 of the fourth lens is 14.43mm, the effective focal length f5 of the fifth lens is-6.05 mm, the total length of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens group) is 4.20mm, half of the diagonal line length of the effective pixel area on the imaging surface S13 of the optical imaging lens group is 2.75mm, half of the maximum field angle Semi-FOV of the optical imaging lens group is 92.6 °, the ratio f/imp of the effective focal length f of the optical imaging lens group to the lens group entrance pupil diameter EPD of the optical imaging is 2.40.
Table 13 shows a basic parameter table of the optical imaging lens group of example 7, in which the radius of curvature and the thickness are both in millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | -1.8087E-02 | -1.7408E-03 | -2.9627E-04 | -5.3805E-05 | -8.5284E-06 | 6.9139E-07 | 5.4323E-07 | 2.7246E-06 | -1.8975E-08 |
| S2 | -1.2069E-01 | -2.0436E-03 | -5.1136E-04 | -1.8785E-04 | -5.9851E-06 | 3.4597E-06 | 1.1962E-05 | -8.1577E-07 | 1.2005E-06 |
| S3 | -1.3289E-01 | -1.9139E-02 | -3.5222E-04 | -7.7414E-04 | 8.6783E-05 | 4.9001E-05 | 7.6758E-05 | 2.9816E-05 | 6.1260E-06 |
| S4 | -1.1254E-01 | -3.0199E-02 | -5.8477E-03 | 3.0193E-04 | 1.7200E-03 | 1.5300E-04 | -3.2402E-04 | -3.5035E-05 | 2.5660E-05 |
| S5 | 1.3165E-01 | 7.9204E-03 | -8.3304E-03 | 1.6360E-03 | 1.9322E-03 | -7.0779E-05 | -6.2056E-04 | 2.2118E-05 | 6.5733E-05 |
| S6 | -1.8431E-01 | 7.5594E-02 | -3.2532E-02 | 1.9071E-02 | -7.9377E-03 | 4.9308E-03 | -2.7879E-03 | 4.9036E-04 | -4.0271E-04 |
| S7 | 7.4052E-02 | 5.5780E-02 | -1.7606E-02 | 1.9283E-02 | -6.3443E-03 | 4.7556E-03 | -2.3758E-03 | 6.8983E-04 | -3.5163E-04 |
| S8 | 2.3373E-01 | 3.4770E-02 | 1.0459E-02 | 4.3090E-03 | -4.7173E-04 | 2.3628E-04 | -1.8511E-04 | 2.3431E-04 | -2.2421E-06 |
| S9 | -1.3467E+00 | 1.3243E-01 | -2.9785E-02 | 6.3007E-03 | -7.2980E-05 | 5.2172E-04 | 1.5266E-03 | -6.8453E-05 | 1.7285E-04 |
| S10 | -4.1180E+00 | 3.4773E-01 | -1.9645E-01 | 3.6569E-02 | -2.3705E-02 | 6.4515E-03 | -3.3989E-03 | 7.3642E-04 | -3.4066E-04 |
TABLE 14
Fig. 14A shows on-axis chromatic aberration curves of the optical imaging lens group of embodiment 7, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens group of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. Fig. 14E shows TV distortion of the optical imaging lens group of embodiment 7, which represents the degree of distortion (or degree of deformation) of the image made by the optical imaging lens group on the object with respect to the object itself. As can be seen from fig. 14A to 14E, the optical imaging lens group according to embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 15.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| |Dist.|(％) | 1.99 | 2.02 | 2.01 | 2.00 | 2.00 | 1.73 | 2.02 |
| (T34+T45)/T12 | 0.69 | 0.73 | 0.64 | 0.66 | 0.82 | 0.99 | 0.80 |
| TTL/ImgH+f/EPD | 3.92 | 3.93 | 4.03 | 3.99 | 3.92 | 3.93 | 3.93 |
| |TVD|(％) | -2.02 | -2.02 | -2.02 | -2.01 | -2.01 | -0.83 | -2.01 |
| FOV | 93.26 | 92.35 | 92.33 | 90.00 | 92.33 | 92.19 | 92.56 |
| Fb/Fa | -4.69 | -3.55 | -4.04 | -4.06 | -4.04 | -4.33 | -4.00 |
| f/f1 | 0.47 | 0.46 | 0.49 | 0.49 | 0.35 | 0.89 | 0.46 |
| (CT2+CT3)/CT1 | 2.21 | 2.16 | 2.17 | 2.14 | 2.12 | 1.91 | 2.18 |
| (R5+R6)/f3 | -0.60 | -0.65 | -0.60 | -0.60 | -0.61 | -0.55 | -0.39 |
| (R9+R10)/f5 | -0.27 | -0.13 | -0.28 | -0.28 | -0.28 | -0.26 | -0.29 |
| (R7+R8)/R1 | -0.68 | -0.73 | -0.69 | -0.69 | -0.74 | -0.62 | -0.64 |
| ATmax/ΔDTmax | 0.51 | 0.54 | 0.56 | 0.61 | 0.59 | 0.40 | 0.58 |
| DT41/ET1+DT51/ET5 | 4.80 | 4.64 | 4.77 | 4.70 | 4.74 | 4.66 | 4.70 |
| (SAG32+SAG41)/SAG42 | 2.02 | 2.07 | 1.99 | 2.00 | 2.03 | 2.21 | 2.04 |
| (ET2/DT21)/(ET1/DT12) | 1.01 | 0.98 | 0.97 | 0.98 | 1.00 | 1.11 | 0.99 |
Watch 15
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (17)
1. An optical imaging lens group comprising, in order from an object side to an image side along an optical axis, a first lens group composed of a first lens, a second lens, and a third lens, and a second lens group composed of a fourth lens and a fifth lens,
the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface;
the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the maximum optical distortion Dist of the optical imaging lens group satisfies: l Dist. | < 2.5%;
the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis, the half ImgH of the diagonal length of the effective pixel area on the imaging surface, the effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group meet the following requirements: TTL/ImgH + f/EPD is less than 4.2; and
an air interval T12 of the first lens and the second lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.3< (T34+ T45)/T12< 1.3.
2. The optical imaging lens group of claim 1 wherein the TV distortion TVD of the optical imaging lens group satisfies: | TVD | < 2.5%.
3. The optical imaging lens group of claim 1 wherein the maximum field angle FOV of the optical imaging lens group satisfies: 85 ° < FOV <100 °.
4. The optical imaging lens group of claim 1, wherein the effective focal length Fa of the first lens group and the effective focal length Fb of the second lens group satisfy: -5.0< Fb/Fa < -3.0.
5. The optical imaging lens group of claim 1 wherein the first lens Abbe number V1, the second lens Abbe number V2, and the third lens Abbe number V3 satisfy: v1>40, V2>40 and V3> 40.
6. The optical imaging lens group of claim 1, wherein the abbe number V4 of the fourth lens and the abbe number V5 of the fifth lens satisfy: v4<20 and V5< 20.
7. The optical imaging lens group of claim 1, wherein the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy: n4>1.6 and N5> 1.6.
8. The optical imaging lens group of claim 1, wherein the effective focal length f of the optical imaging lens group and the effective focal length f1 of the first lens satisfy: 0< f/f1< 1.0.
9. The optical imaging lens group of claim 1 wherein the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 1.5< (CT2+ CT3)/CT1< 2.5.
10. The optical imaging lens group of claim 1, wherein the effective focal length f3 of the third lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: -0.7< (R5+ R6)/f3< 0.
11. The optical imaging lens group of claim 1, wherein the effective focal length f5 of the fifth lens, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: -0.5< (R9+ R10)/f5< 0.
12. The optical imaging lens group of claim 1, wherein the radius of curvature of the object-side surface of the first lens R1, the radius of curvature of the object-side surface of the fourth lens R7, and the radius of curvature of the image-side surface of the fourth lens R8 satisfy: -1.0< (R7+ R8)/R1< 0.
13. Optical imaging lens group according to claim 1, characterized by 0.3< ATmax/Δ DTmax <0.8, wherein,
any two adjacent lenses of the first lens to the fifth lens have an air space on the optical axis, and ATmax is the maximum value of the air space; and
Δ DTmax is a maximum value among absolute values of differences between maximum effective radii of two adjacent surfaces of any two adjacent lenses of the first lens to the fifth lens.
14. The optical imaging lens group of claim 1 wherein the maximum effective radius DT41 of the object side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens, the edge thickness ET1 of the first lens, and the edge thickness ET5 of the fifth lens satisfy: 4.0< DT41/ET1+ DT51/ET5< 5.0.
15. The optical imaging lens group of claim 1, wherein an on-axis distance SAG32 between an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens, an on-axis distance SAG41 between an intersection of the object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens, and an on-axis distance SAG42 between an intersection of the image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens satisfy: 1.5< (SAG32+ SAG41)/SAG42< 2.5.
16. The optical imaging lens group of claim 1 wherein the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness DT12 of the first lens, and the maximum effective radius DT21 of the object side surface of the second lens satisfy: 0.5< (ET2/DT21)/(ET1/DT12) < 1.5.
17. The optical imaging lens group of any one of claims 1 to 16,
the first lens element with positive refractive power has a convex object-side surface; and
the fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface.
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