CN112684589B - Camera lens group - Google Patents

Camera lens group Download PDF

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CN112684589B
CN112684589B CN202110052620.XA CN202110052620A CN112684589B CN 112684589 B CN112684589 B CN 112684589B CN 202110052620 A CN202110052620 A CN 202110052620A CN 112684589 B CN112684589 B CN 112684589B
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lens
image
lens group
satisfy
optical axis
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CN112684589A (en
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王彦
肖海东
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Abstract

The present invention discloses a photographing lens assembly, which sequentially comprises, from an object side to an image side along an optical axis: a diaphragm; a first lens having an optical power; a second lens having an optical power; a third lens having optical power; wherein, half of the Semi-FOV of the maximum field angle of the camera lens group and the effective focal length f of the camera lens group satisfy: 1.00mm ‑1 ＜tan 2 (Semi‑FOV)/f＜1.50mm ‑1 (ii) a The effective focal length f of the camera lens group and the distance BFL from the image side surface of the third lens to the imaging surface of the camera lens group on the optical axis satisfy that: f/BFL is more than 1.00 and less than 3.00; an on-axis distance SAG22 between the intersection point of the second lens image-side surface and the optical axis and the effective radius vertex of the second lens image-side surface and an on-axis distance SAG21 between the intersection point of the second lens object-side surface and the optical axis and the effective radius vertex of the second lens object-side surface satisfy: -4.00< SAG22/SAG21< 3.00. The camera lens group provided by the invention can provide an infrared visible light confocal lens, and has the characteristics of large aperture, large wide angle and the like on the basis of ensuring the miniaturization of the lens.

Description

Camera lens group
Technical Field
The invention belongs to the field of optical imaging, and particularly relates to a camera lens group comprising three lenses.
Background
With the popularization of portable electronic products such as mobile phones and tablet computers, people increasingly need diversified functions of the products. Meanwhile, with the development of scientific technology, the 3D camera shooting technology is more and more mature and widely applied to portable electronic products.
In order to meet the demand of market development, an infrared and visible light co-focusing lens is needed, and the infrared and visible light co-focusing lens has the characteristics of large aperture, large wide angle and the like on the basis of ensuring the miniaturization of the lens.
Disclosure of Invention
The invention aims to provide a camera lens group consisting of three lenses, which can provide an infrared and visible light confocal lens and has the characteristics of large aperture, large wide angle and the like on the basis of ensuring the miniaturization of the lens.
One aspect of the present invention provides an image capturing lens assembly, in order from an object side to an image side along an optical axis, comprising: a diaphragm, a first lens having a focal power; a second lens having an optical power; a third lens having a focal power.
Wherein, half of the Semi-FOV of the maximum field angle of the image pickup lens group and the effective focal length f of the image pickup lens group satisfy: 1.00mm -1 <tan 2 (Semi-FOV)/f<1.50mm -1 (ii) a The effective focal length f of the camera lens group and the distance BFL from the image side surface of the third lens to the imaging surface of the camera lens group on the optical axis satisfy: 1.00<f/BFL<3.00; an on-axis distance SAG22 between the intersection point of the second lens image-side surface and the optical axis and the effective radius vertex of the second lens image-side surface and an on-axis distance SAG21 between the intersection point of the second lens object-side surface and the optical axis and the effective radius vertex of the second lens object-side surface satisfy: -4.00<SAG22/SAG21<3.00。
According to one embodiment of the present invention, an on-axis distance TTL from an object-side surface of the first lens to an imaging surface and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than or equal to 1.61.
According to one embodiment of the present invention, the F-number Fno of the image pickup lens group satisfies: fno is less than or equal to 1.56.
According to one embodiment of the invention, the combined focal length f12 of the first lens and the second lens and the curvature radius R4 of the image side surface of the second lens meet the following conditions: -5.00< f12/R4< -1.00.
According to one embodiment of the invention, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 0.00< R3/R2< 3.00.
According to one embodiment of the invention, the central thickness CT1 of the first lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.50< CT1/CT3< 3.00.
According to one embodiment of the invention, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 1.00< (ET2+ ET3)/(ET3-ET2) < 5.00.
According to one embodiment of the present invention, the effective radius DT31 of the object-side surface of the third lens and the effective radius DT32 of the image-side surface of the third lens satisfy the following conditional expression: 4.00< (DT31+ DT32)/(DT32-DT31) < 9.00.
According to one embodiment of the present invention, a sum Σ AT of air intervals on the optical axis between any adjacent two lenses having optical powers of the first lens to the third lens and a distance TD on the optical axis between the object-side surface of the first lens to the image-side surface of the third lens satisfy: Σ AT/TD < 0.30.
According to an embodiment of the present invention, a combined focal length f23 of the second lens and the third lens and an effective focal length f of the image capturing lens group satisfy: 0.50< f23/f < 7.00.
In another aspect, the present invention provides an image capturing lens assembly, in order from an object side to an image side along an optical axis, comprising: a diaphragm; a first lens having an optical power; a second lens having an optical power; a third lens having optical power.
Wherein, each lens is independent, and there is air space on the optical axis between each lens; the half Semi-FOV of the maximum field angle of the image pickup lens group and the effective focal length f of the image pickup lens group satisfy: 1.00mm -1 <tan 2 (Semi-FOV)/f<1.50mm -1 (ii) a An on-axis distance SAG22 between the intersection point of the second lens image-side surface and the optical axis and the effective radius vertex of the second lens image-side surface and an on-axis distance SAG21 between the intersection point of the second lens object-side surface and the optical axis and the effective radius vertex of the second lens object-side surface satisfy: -4.00<SAG22/SAG21<3.00; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH is less than or equal to 1.61.
The invention has the beneficial effects that:
the camera lens group provided by the invention comprises a plurality of lenses, such as a first lens, a second lens and a third lens. The camera lens group can provide an infrared and visible light co-focusing lens, and has the characteristics of large aperture, large wide angle and the like on the basis of ensuring the miniaturization of the lens.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a lens assembly of an embodiment 1 of the image capturing lens assembly of the present invention;
fig. 2a to 2d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the photographing lens assembly of embodiment 1 of the present invention, respectively;
FIG. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention;
fig. 4a to 4d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the photographing lens assembly of embodiment 2 according to the present invention;
FIG. 5 is a schematic view of a lens assembly according to embodiment 3 of the present invention;
fig. 6a to 6d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the photographing lens assembly of embodiment 3 of the present invention, respectively;
FIG. 7 is a schematic view of a lens assembly according to embodiment 4 of the present invention;
fig. 8a to 8d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve, respectively, of the photographing lens assembly of embodiment 4;
FIG. 9 is a schematic view of a lens assembly according to embodiment 5 of the present invention;
FIGS. 10a to 10d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve, respectively, of the photographing lens assembly of embodiment 5;
FIG. 11 is a schematic view of a lens assembly according to embodiment 6 of the present invention;
fig. 12a to 12d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve, respectively, of the photographing lens assembly of embodiment 6 of the present invention;
FIG. 13 is a schematic view of a lens assembly of the image capturing lens assembly according to embodiment 7 of the present invention;
fig. 14a to 14d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve, respectively, of the photographing lens assembly of embodiment 7 of the present invention;
FIG. 15 is a schematic view of a lens assembly of the image capturing lens assembly according to embodiment 8 of the present invention;
fig. 16a to 16d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve, respectively, of the photographing lens assembly of embodiment 8 of the present invention;
FIG. 17 is a schematic view of a lens assembly of the image capturing lens assembly according to embodiment 9 of the present invention;
fig. 18a to 18d are an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve, respectively, of the photographing lens assembly of embodiment 9 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that in this specification the expressions first, second, third etc. are only used 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 invention.
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, 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.
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.
In the description of the present invention, 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.
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 of the present invention may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Exemplary embodiments
The image capturing lens assembly according to an exemplary embodiment of the present invention includes three lens elements, in order from an object side to an image side along an optical axis: the lens comprises a diaphragm, a first lens, a second lens and a third lens, wherein the lenses are independent from one another, and air space is formed between the lenses on an optical axis.
In the present exemplary embodiment, the first lens may have a positive power or a negative power; the second lens may have a positive or negative optical power; the third lens may have a positive power or a negative power.
In the present exemplary embodiment, the condition that half of the Semi-FOV of the maximum angle of view of the image capturing lens group and the effective focal length f of the image capturing lens group satisfy is: 1.00mm -1 <tan 2 (Semi-FOV)/f<1.50mm -1 . By restricting the ratio of half of the maximum field angle of the camera lens group to the effective focal length of the lens group, the size of the field angle of the camera lens group can be effectively controlled, which is beneficial to obtaining a larger field range, improving the collection capability of the camera lens group on object information and realizing the imaging effect of the wide angle of the camera lens group. More specifically, Semi-FOV and f satisfy: 1.05mm -1 <tan 2 (Semi-FOV)/f<1.42mm -1 E.g. 1.08mm -1 ≤tan 2 (Semi-FOV)/f≤1.41mm -1 。
In the present exemplary embodiment, the conditional expression that the effective focal length f of the image pickup lens group and the distance BFL on the optical axis from the image side surface of the third lens to the imaging surface of the image pickup lens group satisfy is: 1.00< f/BFL < 3.00. The distance from the image side surface of the third lens to the imaging surface of the camera lens group on the optical axis is in a reasonable range, so that a margin can be reserved for the structure, and the processing is facilitated. More specifically, f and BFL satisfy: 1.5< f/BFL <2.2, e.g., 1.60 ≦ f/BFL ≦ 2.16.
In the present exemplary embodiment, the conditional expression that the on-axis distance SAG22 between the intersection point of the second lens image-side surface and the optical axis to the effective radius vertex of the second lens image-side surface and the on-axis distance SAG21 between the intersection point of the second lens object-side surface and the optical axis to the effective radius vertex of the second lens object-side surface satisfy: -4.00< SAG22/SAG21< 3.00. More specifically, SAG22 and SAG21 satisfy: -3.9< SAG22/SAG21<2.8, for example, -3.81. ltoreq. SAG22/SAG 21. ltoreq.2.78.
In the present exemplary embodiment, the conditional expression that the on-axis distance TTL from the object-side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy is: TTL/ImgH is less than or equal to 1.61. By controlling the ratio of the total optical length to the image height of the photographing lens group, the total size of the photographing lens group can be effectively reduced, and the ultrathin characteristic and the miniaturization of the photographing lens group are realized. More specifically, TTL and ImgH satisfy: 1.5 ≦ TTL/ImgH ≦ 1.61, e.g., 1.57 ≦ TTL/ImgH ≦ 1.61.
In the present exemplary embodiment, the F-number Fno of the image pickup lens group satisfies the conditional expression: fno is less than or equal to 1.56. Through the F number of the camera lens group which is reasonably restrained, the camera lens group can be ensured to have large aperture imaging effect, and good imaging quality can be ensured in a dark environment. More specifically, Fno satisfies: 1.50. ltoreq. Fno.ltoreq.1.56, for example, Fno 1.56.
In the present exemplary embodiment, the combined focal length f12 of the first and second lenses and the curvature radius R4 of the image-side surface of the second lens satisfy the conditional expression: -5.00< f12/R4< -1.00. Through the ratio of the combined focal length of the first and second lenses of the camera lens group and the curvature radius of the image side surface of the second lens, the astigmatism of the camera lens group can be effectively controlled, and the imaging quality of an off-axis field of view can be improved. More specifically, f12 and R4 satisfy: -4.9< f12/R4< -1.3, for example, -4.85. ltoreq. f 12/R4. ltoreq. 1.35.
In the present exemplary embodiment, the conditional expression that the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R2 of the image-side surface of the first lens satisfy is: 0.00< R3/R2< 3.00. The curvature radius of the lens is reasonably configured, so that CRA matching of the lens is ensured, curvature of field of the lens is corrected, and imaging definition requirements of each view field are met. More specifically, R3 and R2 satisfy: 0.5< R3/R2<2.5, e.g., 0.55. ltoreq. R3/R2. ltoreq.2.44.
In the present exemplary embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy the conditional expression: 0.50< CT1/CT3< 3.00. By controlling the ratio of the central thickness of the first lens and the third lens, the distortion of the camera lens group can be reasonably regulated and controlled, and finally the distortion of the camera lens group is in a certain range. More specifically, CT1 and CT3 satisfy: 0.9< CT1/CT3<2.3, e.g., 0.94. ltoreq. CT1/CT 3. ltoreq.2.22.
In the present exemplary embodiment, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy the conditional expression: 1.00< (ET2+ ET3)/(ET3-ET2) < 5.00. By restricting the ratio of the sum of the difference of the edge thicknesses of the second lens and the third lens within a certain range, the aberration of the off-axis field of view can be reasonably controlled, so that the imaging camera lens group has good imaging quality. More specifically, ET2 and ET3 satisfy: 1.4< (ET2+ ET3)/(ET3-ET2) <4.9, for example, 1.49 ≦ (ET2+ ET3)/(ET3-ET2) ≦ 4.86.
In the present exemplary embodiment, the effective radius DT31 of the object-side surface of the third lens and the effective radius DT32 of the image-side surface of the third lens satisfy the conditional expression: 4.00< (DT31+ DT32)/(DT32-DT31) < 9.00. The difference between the sum of the effective semi-calibers of the object side surface and the image side surface of the third lens is reasonably controlled within a certain range, so that the third lens can meet the requirement of machinability. More specifically, DT31 and DT32 satisfy: 4.3< (DT31+ DT32)/(DT32-DT31) <8.7, e.g., 4.35 ≦ (DT31+ DT32)/(DT32-DT31) ≦ 8.63.
In the present exemplary embodiment, the conditional expression that the sum Σ AT of the air intervals on the optical axis between any adjacent two lenses having optical powers of the first lens to the third lens and the distance TD on the optical axis between the object-side surface of the first lens to the image-side surface of the third lens satisfy is: Σ AT/TD < 0.30. The reasonable distribution lens group air gap of making a video recording can guarantee processing and equipment characteristic, avoids appearing the clearance undersize and leads to the front and back lens to interfere the scheduling problem before the assembling process appears. Meanwhile, the light deflection is favorably slowed down, the field curvature of the camera lens group is adjusted, the sensitivity is reduced, and better imaging quality is obtained. More specifically, Σ AT and TD satisfy: 0< ∑ AT/TD <0.29, e.g., 0.04 ≦ Σ AT/TD ≦ 0.28.
In the present exemplary embodiment, the combined focal length f23 of the second lens and the third lens and the effective focal length f of the image pickup lens group satisfy the conditional expression: 0.50< f23/f < 7.00. By reasonably controlling the combined focal length of the second lens and the third lens within a certain range, the contribution of the aberration of the two lenses can be controlled to balance with the aberration generated by the front-end optical element, so that the aberration of the shooting lens group is in a reasonable horizontal state. More specifically, f23 and f satisfy: 0.60< f23/f <6.98, e.g., 0.65. ltoreq. f 23/f. ltoreq.6.95.
In the present exemplary embodiment, the above-described photographing lens group may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. Optionally, the above-mentioned image pickup lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the image plane.
The image capturing lens assembly according to the above embodiment of the present invention can employ a plurality of lenses, for example, the above three lenses. The focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, so that the camera lens group has a larger imaging image surface, has the characteristics of wide imaging range and high imaging quality, and ensures the ultrathin property of the mobile phone.
In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the third lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, and the third lens is an aspheric mirror surface. Optionally, the object-side surface and the image-side surface of each of the first lens, the second lens and the third lens are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although three lenses are exemplified in the embodiment, the photographing lens group is not limited to include three lenses, and the photographing lens group may include other numbers of lenses if necessary.
Specific embodiments of an image pickup lens group suitable for the above embodiments are further described below with reference to the drawings.
Detailed description of the preferred embodiment 1
Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, the lens assembly in order from an object side to an image side includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 1, the basic parameter table of the image pickup lens assembly according to embodiment 1 is shown, in which the unit of the curvature radius, the thickness, and the focal length are millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round 0.0456
S1 Aspherical surface 1.9448 0.2845 1.09 1.55 56.1 0.0000
S2 Aspherical surface -0.8095 0.1469 0.0000
S3 Aspherical surface -0.5452 0.3091 1.41 1.55 56.1 0.0000
S4 Aspherical surface -0.3819 0.0200 -1.0000
S5 Aspherical surface 0.7062 0.2071 -1.92 1.67 20.4 0.0000
S6 Aspherical surface 0.4005 0.1583 -1.0000
S7 Spherical surface All-round 0.1100 1.52 64.2
S8 Spherical surface All-round 0.2657
S9 Spherical surface All-round
TABLE 1
As shown in table 2, in embodiment 1, the total effective focal length f of the image capturing lens group is 0.92mm, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half Semi-FOV of the maximum field angle of the optical imaging system is 44.9 °.
Figure BDA0002899597490000071
TABLE 2
The image pickup lens group in embodiment 1 satisfies:
tan 2 (Semi-FOV)/f＝1.08mm -1 wherein, Semi-FOV is half of the maximum field angle of the camera lens group, and f is the effective focal length of the camera lens group;
f/BFL is 1.73, wherein f is the effective focal length of the camera lens group, and BFL is the distance from the image side surface of the third lens to the imaging surface of the camera lens group on the optical axis;
SAG22/SAG21 is 2.54, wherein SAG22 is the on-axis distance between the intersection point of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens, and SAG21 is the on-axis distance between the intersection point of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens;
the TTL/ImgH is 1.61, wherein the TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and the ImgH is half of the diagonal length of the effective pixel area on the imaging surface;
fno is 1.56, wherein Fno is the F number of the image capturing lens group;
f12/R4 is-1.35, wherein f12 is the composite focal length of the first lens and the second lens, and R4 is the curvature radius of the image side surface of the second lens;
R3/R2 is 1.55, where R3 is the radius of curvature of the object-side surface of the second lens, and R2 is the radius of curvature of the image-side surface of the first lens;
CT1/CT3 is 1.37, where CT1 is the central thickness of the first lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis;
(ET2+ ET3)/(ET3-ET2) ═ 4.68, where ET2 is the edge thickness of the second lens and ET3 is the edge thickness of the third lens;
(DT31+ DT32)/(DT32-DT31) ═ 6.30, where DT31 is the effective radius of the object-side surface of the third lens and DT32 is the effective radius of the image-side surface of the third lens;
Σ AT/TD is 0.17, where Σ AT is a sum of air intervals on the optical axis between any two adjacent lenses having refractive powers of the first lens to the third lens, and TD is a distance on the optical axis between the object side surface of the first lens and the image side surface of the third lens;
f23/f is 4.55, where f23 is the combined focal length of the second lens and the third lens, and f is the effective focal length of the imaging lens group.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the third lens E3 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 BDA0002899597490000081
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, and c is 1/R (i.e., paraxial curvature c is the reciprocal of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.
In example 1, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 3 shows high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S6 in example 1 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 -3.0459E+00 1.2955E+02 -7.4323E+03 2.3852E+05 -4.7366E+06 5.8493E+07 -4.3343E+08
S2 6.2726E-01 -9.9400E+01 3.1937E+03 -5.8710E+04 6.5352E+05 -4.3028E+06 1.6240E+07
S3 3.4819E+00 -2.2831E+01 2.2087E+02 1.7965E+03 -3.5687E+04 2.7184E+05 -1.2632E+06
S4 6.2656E+00 -1.6351E+02 3.3314E+03 -4.5886E+04 4.1899E+05 -2.4604E+06 8.8789E+06
S5 -2.6444E+00 1.9554E+02 -1.5892E+04 6.2118E+05 -1.5086E+07 2.4812E+08 -2.8792E+09
S6 -5.2724E+00 -1.2902E+01 1.0299E+03 -1.8870E+04 2.0602E+05 -1.5048E+06 7.6783E+06
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.7513E+09 -2.9507E+09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 -3.2422E+07 2.6534E+07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 3.3649E+06 -3.8050E+06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 -1.7726E+07 1.4744E+07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 2.4034E+10 -1.4500E+11 6.2670E+11 -1.8911E+12 3.7809E+12 -4.4961E+12 2.4042E+12
S6 -2.7902E+07 7.2537E+07 -1.3371E+08 1.7038E+08 -1.4250E+08 7.0294E+07 -1.5481E+07
TABLE 3
Fig. 2a shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 1, which represents the deviation of the convergent focus 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 image pickup lens group of embodiment 1. Fig. 2c shows a distortion curve of the image capturing lens group of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As shown in fig. 2a to 2d, the image capturing lens assembly of embodiment 1 can achieve good image quality.
Specific example 2
Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the lens assembly in order from an object side to an image side includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 4, the basic parameter table of the imaging lens group according to embodiment 2 is shown, in which the unit of the curvature radius, the thickness, and the focal length are millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface Go to nothing All-round
STO Spherical surface All-round 0.0436
S1 Aspherical surface 1.8449 0.2907 1.10 1.55 56.1 0.0000
S2 Aspherical surface -0.8334 0.1571 0.0000
S3 Aspherical surface -0.6498 0.3064 -1.41 1.55 56.1 0.0000
S4 Aspherical surface -5.0123 0.0200 0.0000
S5 Aspherical surface 0.3167 0.2497 1.09 1.67 20.4 -1.0000
S6 Aspherical surface 0.3902 0.2079 -1.0000
S7 Spherical surface Go to nothing 0.1100 1.52 64.2
S8 Spherical surface All-round 0.1582
S9 Spherical surface Go to nothing
TABLE 4
As shown in table 5, in embodiment 2, the total effective focal length f of the image pickup lens group is 0.92mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 45.1 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002899597490000091
TABLE 5
In example 2, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S6 in example 2 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 BDA0002899597490000092
Figure BDA0002899597490000101
TABLE 6
Fig. 4a shows on-axis chromatic aberration curves of the image-taking lens group of embodiment 2, which represent deviation of convergent focuses 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 image pickup lens group of embodiment 2. Fig. 4c shows a distortion curve of the image capturing lens group of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As shown in fig. 4a to 4d, the image capturing lens assembly of embodiment 2 can achieve good image quality.
Specific example 3
Fig. 5 is a lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through each of the surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 7, the basic parameter table of the imaging lens group according to embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0002899597490000102
Figure BDA0002899597490000111
TABLE 7
As shown in table 8, in embodiment 3, the total effective focal length f of the image pickup lens group is 0.90mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 45.8 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002899597490000112
TABLE 8
In example 3, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 9 shows the high-order term coefficients a usable for the aspheric mirror surfaces S1 to S6 in example 3 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 -8.8096E+00 1.5886E+03 -1.9778E+05 1.5117E+07 -7.6336E+08 2.6569E+10 -6.5393E+11
S2 3.7905E-01 -9.4905E+01 3.8565E+03 -1.1172E+05 2.3389E+06 -3.5001E+07 3.7416E+08
S3 1.1309E+01 -3.5758E+02 1.1521E+04 -4.0495E+05 1.4369E+07 -4.0351E+08 8.1189E+09
S4 -3.6191E+00 -6.8909E+01 -1.5791E+03 2.6629E+05 -1.0294E+07 2.2530E+08 -3.2435E+09
S5 -1.2035E+01 4.2253E+02 -2.7494E+04 1.1011E+06 -2.8402E+07 5.0119E+08 -6.2689E+09
S6 1.3684E+00 -1.5615E+02 2.7680E+03 -3.0885E+04 2.3947E+05 -1.3301E+06 5.3661E+06
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.1532E+13 -1.4600E+14 1.3140E+15 -8.1913E+15 3.3582E+16 -8.1354E+16 8.8156E+16
S2 -2.8418E+09 1.5225E+10 -5.6870E+10 1.4466E+11 -2.3867E+11 2.3017E+11 -9.8391E+10
S3 -1.1512E+11 1.1506E+12 -8.0590E+12 3.8714E+13 -1.2151E+14 2.2447E+14 -1.8509E+14
S4 3.2336E+10 -2.2665E+11 1.1084E+12 -3.6666E+12 7.6833E+12 -8.8895E+12 3.9809E+12
S5 5.6567E+10 -3.6970E+11 1.7340E+12 -5.6878E+12 1.2385E+13 -1.6076E+13 9.4115E+12
S6 -1.5798E+07 3.3813E+07 -5.1873E+07 5.5424E+07 -3.9070E+07 1.6302E+07 -3.0445E+06
TABLE 9
Fig. 6a shows on-axis chromatic aberration curves of the image-taking lens group of embodiment 3, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing meridional image plane curvature and sagittal image plane curvature of the image pickup lens group of embodiment 3. Fig. 6c shows a distortion curve of the image capturing lens group of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6a to 6d, the imaging lens assembly according to embodiment 3 can achieve good imaging quality.
Specific example 4
Fig. 7 is a lens assembly according to embodiment 4 of the present invention, in order from an object side to an image side, the lens assembly includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 10, the basic parameter table of the imaging lens group according to embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round 0.0459
S1 Aspherical surface -1.9448 0.3035 1.06 1.55 56.1 -34.9382
S2 Aspherical surface -0.4679 0.2478 -0.5195
S3 Aspherical surface -0.4606 0.2000 5.49 1.55 56.1 -0.2454
S4 Aspherical surface -0.4599 0.0200 -0.6758
S5 Aspherical surface 0.5205 0.2000 10.96 1.67 20.4 -0.4577
S6 Aspherical surface 0.4755 0.2793 -0.8811
S7 Spherical surface All-round 0.1100 1.52 64.2
S8 Spherical surface All-round 0.1393
S9 Spherical surface All-round
TABLE 10
As shown in table 11, in embodiment 4, the total effective focal length f of the image pickup lens group is 0.85mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 47.5 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002899597490000121
Figure BDA0002899597490000131
TABLE 11
In example 4, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 12 shows that each aspheric mirror surface that can be used in example 4High-order term coefficient A of S1-S6 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 2.3071E+01 -7.6772E+03 1.1826E+06 -1.0973E+08 6.6244E+09 -2.7330E+11 7.9408E+12
S2 1.0390E+01 -1.3592E+03 1.0303E+05 -5.0212E+06 1.6689E+08 -3.9159E+09 6.6066E+10
S3 5.3305E+00 5.5713E+01 -4.6193E+03 1.9669E+05 -5.7061E+06 1.1800E+08 -1.7730E+09
S4 3.5668E+00 -3.9319E+01 -5.5097E+03 4.1429E+05 -1.4414E+07 3.0779E+08 -4.4093E+09
S5 -4.2621E+00 3.5724E+02 -2.3160E+04 8.6206E+05 -2.0829E+07 3.4508E+08 -4.0490E+09
S6 -1.3838E+00 3.0455E+01 -6.8103E+02 5.7153E+03 -1.9345E+04 -4.3334E+04 7.6829E+05
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 -1.6510E+14 2.4656E+15 -2.6215E+16 1.9350E+17 -9.4153E+17 2.7137E+18 -3.5065E+18
S2 -8.0699E+11 7.1170E+12 -4.4717E+13 1.9463E+14 -5.5638E+14 9.3786E+14 -7.0549E+14
S3 1.9492E+10 -1.5627E+11 9.0045E+11 -3.6215E+12 9.6269E+12 -1.5171E+13 1.0715E+13
S4 4.4065E+10 -3.1179E+11 1.5573E+12 -5.3735E+12 1.2190E+13 -1.6362E+13 9.8448E+12
S5 3.4218E+10 -2.0909E+11 9.1545E+11 -2.7995E+12 5.6767E+12 -6.8564E+12 3.7327E+12
S6 -3.9174E+06 1.1726E+07 -2.2838E+07 2.9323E+07 -2.3980E+07 1.1327E+07 -2.3521E+06
TABLE 12
Fig. 8a shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 4, which represents the deviation of the convergent focus 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 image pickup lens group of embodiment 4. Fig. 8c shows a distortion curve of the image capturing lens group of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8a to 8d, the imaging lens assembly according to embodiment 4 can achieve good imaging quality.
Specific example 5
Fig. 9 is a lens assembly according to embodiment 5 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 13, the basic parameter table of the imaging lens group according to embodiment 5 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0002899597490000132
Figure BDA0002899597490000141
Watch 13
As shown in table 14, in embodiment 5, the total effective focal length f of the image capturing lens group is 0.92mm, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the imaging surface S9 is 1.48mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half Semi-FOV of the maximum field angle of the optical imaging system is 45.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are listed in the following table.
Figure BDA0002899597490000142
TABLE 14
In example 5, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 15 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S6 in example 5 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 BDA0002899597490000143
Figure BDA0002899597490000151
Watch 15
Fig. 10a shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 5, which represents the deviation of the convergent focus 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 image pickup lens group of embodiment 5. Fig. 10c shows a distortion curve of the image capturing lens group of embodiment 5, which represents the distortion magnitude values corresponding to different image heights. Fig. 10d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10a to 10d, the image capturing lens assembly according to embodiment 5 can achieve good image quality.
Specific example 6
Fig. 11 is a lens assembly according to embodiment 6, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 16, the basic parameter table of the imaging lens group according to embodiment 6 is shown, in which the units of the radius of curvature, thickness, and focal length are millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface Go to nothing Go to nothing
STO Spherical surface All-round 0.0155
S1 Aspherical surface 0.9841 0.4438 -3.39 1.55 56.1 6.3808
S2 Aspherical surface 0.5397 0.0215 -86.0344
S3 Aspherical surface 0.5452 0.3241 0.58 1.55 56.1 -99.0000
S4 Aspherical surface -0.5938 0.0200 -0.4687
S5 Aspherical surface 0.6816 0.2000 -1.82 1.67 20.4 0.0101
S6 Aspherical surface 0.3839 0.1820 -1.4176
S7 Spherical surface Go to nothing 0.1100 1.52 64.2
S8 Spherical surface All-round 0.1987
S9 Spherical surface All-round
TABLE 16
As shown in table 17, in embodiment 6, the total effective focal length f of the image pickup lens group is 0.92mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 45.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are listed in the following table.
Figure BDA0002899597490000161
TABLE 17
In example 6, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 18 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S6 in example 6 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 1.9829E+00 -1.0818E+03 1.5573E+05 -1.3173E+07 7.1228E+08 -2.6061E+10 6.6757E+11
S2 1.4222E+00 3.2182E+02 -2.4165E+04 8.0824E+05 -1.6448E+07 2.1586E+08 -1.8809E+09
S3 -4.4620E+00 1.5603E+03 -1.3658E+05 7.0162E+06 -2.3989E+08 5.7101E+09 -9.6865E+10
S4 -2.1908E+00 -2.6766E+02 2.6385E+04 -1.2013E+06 3.5762E+07 -7.5175E+08 1.1542E+10
S5 -8.3272E+00 1.5231E+01 -6.4081E+02 9.8473E+04 -3.8076E+06 8.0875E+07 -1.1141E+09
S6 -7.1997E+00 4.7351E+01 -2.6361E+02 2.0499E+03 -2.2244E+04 1.8699E+05 -1.0476E+06
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 -1.2192E+13 1.5956E+14 -1.4839E+15 9.5639E+15 -4.0564E+16 1.0172E+17 -1.1414E+17
S2 1.1050E+10 -4.3693E+10 1.1336E+11 -1.7996E+11 1.4331E+11 -9.8721E+09 -4.3794E+10
S3 1.1836E+12 -1.0420E+13 6.5402E+13 -2.8513E+14 8.1981E+14 -1.3969E+15 1.0679E+15
S4 -1.3155E+11 1.1164E+12 -6.9782E+12 3.1228E+13 -9.4658E+13 1.7390E+14 -1.4598E+14
S5 1.0562E+10 -7.0365E+10 3.2926E+11 -1.0601E+12 2.2368E+12 -2.7847E+12 1.5506E+12
S6 3.9575E+06 -1.0274E+07 1.8390E+07 -2.2323E+07 1.7549E+07 -8.0623E+06 1.6431E+06
Watch 18
Fig. 12a shows on-axis chromatic aberration curves of the image-taking lens group of embodiment 6, which represent deviation of convergent focuses 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 image pickup lens group of embodiment 6. Fig. 12c shows a distortion curve of the image capturing lens group of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12a to 12d, the imaging lens assembly according to embodiment 6 can achieve good imaging quality.
Specific example 7
Fig. 13 is a lens assembly according to embodiment 7, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through each of the surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 19, the basic parameter table of the imaging lens group according to embodiment 7 is shown, in which the units of the radius of curvature, thickness, and focal length are millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round 0.0315
S1 Aspherical surface 1.2713 0.2823 1.09 1.55 56.1 -0.5415
S2 Aspherical surface -1.0175 0.1365 -0.5699
S3 Aspherical surface -0.7998 0.2763 -0.44 1.55 56.1 0.6728
S4 Aspherical surface 0.3819 0.0204 -23.7402
S5 Aspherical surface 0.2079 0.2996 0.39 1.67 20.4 -2.4737
S6 Aspherical surface 0.4760 0.1426 -0.7147
S7 Spherical surface All-round 0.1100 1.52 64.2
S8 Spherical surface All-round 0.1986
S9 Spherical surface All-round
Watch 19
As shown in table 20, in embodiment 7, the total effective focal length f of the image pickup lens group is 0.92mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.47mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 45.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002899597490000171
Watch 20
In example 7, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 21 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S6 in example 7 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 BDA0002899597490000172
Figure BDA0002899597490000181
TABLE 21
Fig. 14a shows on-axis chromatic aberration curves of the image-taking lens group of embodiment 7, which represent deviation of convergent focuses of light rays of different wavelengths through the lens. Fig. 14b shows an astigmatism curve representing meridional image plane curvature and sagittal image plane curvature of the image pickup lens group of embodiment 7. Fig. 14c shows a distortion curve of the image capturing lens group of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14d shows a chromatic aberration of magnification curve of the image capturing lens group of embodiment 7, which represents the deviation of different image heights of light rays on the image forming surface after passing through the lens. As can be seen from fig. 14a to 14d, the imaging lens assembly according to embodiment 7 can achieve good imaging quality.
Specific example 8
Fig. 15 is a lens assembly according to embodiment 8, which, in order from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 22, the basic parameter table of the imaging lens group according to embodiment 8 is shown, in which the units of the radius of curvature, thickness, and focal length are millimeters (mm).
Figure BDA0002899597490000182
Figure BDA0002899597490000191
TABLE 22
As shown in table 23, in embodiment 8, the total effective focal length f of the image pickup lens group is 0.91mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S9 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 45.5 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002899597490000192
TABLE 23
In example 8, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 were both aspherical, and table 24 shows high-order term coefficients a usable for the aspherical mirrors S1 to S6 in example 8 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 -2.4420E+00 -4.8109E+02 1.2223E+05 -1.4582E+07 1.0420E+09 -4.9007E+10 1.5881E+12
S2 -6.6740E-01 1.9484E+01 -1.8508E+03 7.0168E+04 -1.4972E+06 2.0208E+07 -1.7983E+08
S3 -9.2541E+00 1.7387E+03 -1.3715E+05 6.8252E+06 -2.2979E+08 5.4464E+09 -9.2977E+10
S4 3.6241E+01 -2.0505E+03 8.1849E+04 -2.7908E+06 7.6756E+07 -1.5905E+09 2.4141E+10
S5 6.1146E+01 -2.7745E+03 8.7641E+04 -2.1362E+06 4.0661E+07 -6.0022E+08 6.7885E+09
S6 -3.3375E+00 -2.7147E+01 5.8135E+02 -5.6374E+03 3.0634E+04 -6.6866E+04 -2.7945E+05
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 -3.6272E+13 5.8812E+14 -6.7244E+15 5.2948E+16 -2.7297E+17 8.2867E+17 -1.1221E+18
S2 1.0793E+09 -4.4149E+09 1.2265E+10 -2.2624E+10 2.6294E+10 -1.7194E+10 4.7130E+09
S3 1.1560E+12 -1.0472E+13 6.8370E+13 -3.1315E+14 9.5443E+14 -1.7378E+15 1.4296E+15
S4 -2.6637E+11 2.1259E+12 -1.2127E+13 4.8172E+13 -1.2655E+14 1.9759E+14 -1.3884E+14
S5 -5.8088E+10 3.7075E+11 -1.7302E+12 5.7180E+12 -1.2654E+13 1.6802E+13 -1.0115E+13
S6 2.8920E+06 -1.1782E+07 2.8840E+07 -4.5187E+07 4.4479E+07 -2.5105E+07 6.2031E+06
Watch 24
Fig. 16a shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 8, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 16b shows an astigmatism curve representing meridional image plane curvature and sagittal image plane curvature of the image pickup lens group of embodiment 8. Fig. 16c shows a distortion curve of the image capturing lens group of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16d shows a chromatic aberration of magnification curve of the image-taking lens group of embodiment 8, which represents deviation of different image heights of light rays on an image-forming surface after passing through the lens. As can be seen from fig. 16a to 16d, the imaging lens assembly according to embodiment 8 can achieve good imaging quality.
Specific example 9
Fig. 17 is a lens assembly according to embodiment 9, in order from an object side to an image side, the image lens assembly of the present invention: a stop STO, a first lens E1, a second lens E2, a third lens E3, a filter E4, and an image forming surface S9.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging plane S9.
As shown in table 25, the basic parameter table of the imaging lens group according to embodiment 9 is shown, in which the units of the radius of curvature, thickness, and focal length are millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface Go to nothing 0.0456
S1 Aspherical surface 1.7276 0.2931 0.94 1.55 56.1 19.2974
S2 Aspherical surface -0.6771 0.1497 -1.9118
S3 Aspherical surface -0.4898 0.3395 0.35 1.55 56.1 0.0677
S4 Aspherical surface -0.1710 0.1072 -1.7623
S5 Aspherical surface -0.1463 0.2000 -0.51 1.67 20.4 -11.2662
S6 Aspherical surface -0.4005 0.1166 -98.9519
S7 Spherical surface All-round 0.1100 1.52 64.2
S8 Spherical surface All-round 0.1839
S9 Spherical surface Go to nothing
TABLE 25
As shown in table 26, in embodiment 9, the total effective focal length f of the image pickup lens group is 0.89mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S9 is 1.50mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S17 is 0.93mm, and the half semifov of the maximum field angle of the optical imaging system is 45.8 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002899597490000201
Figure BDA0002899597490000211
Watch 26
In example 9, the object-side surface and the image-side surface of any one of the first lens E1 to the third lens E3 are aspheric, and table 27 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S6 in example 9 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 -5.8058E+00 -1.0708E+02 9.2280E+04 -1.2446E+07 9.1202E+08 -4.3162E+10 1.4058E+12
S2 2.4642E+01 -5.4984E+03 6.3564E+05 -4.6201E+07 2.2666E+09 -7.8283E+10 1.9501E+12
S3 -2.0286E+01 2.7514E+03 -2.3434E+05 1.3044E+07 -4.8660E+08 1.2618E+10 -2.3332E+11
S4 2.3862E+01 -1.0279E+03 2.9041E+04 -4.2220E+05 -1.6706E+06 2.1466E+08 -4.8852E+09
S5 -4.7563E+00 1.2295E+03 -5.8156E+04 1.6601E+06 -3.2679E+07 4.6268E+08 -4.8004E+09
S6 1.5180E+01 -2.6987E+02 3.5613E+03 -3.6091E+04 2.7325E+05 -1.5269E+06 6.2693E+06
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 -3.2384E+13 5.3184E+14 -6.1818E+15 4.9622E+16 -2.6133E+17 8.1163E+17 -1.1255E+18
S2 -3.5432E+13 4.6964E+14 -4.4882E+15 3.0094E+16 -1.3424E+17 3.5752E+17 -4.2995E+17
S3 3.1208E+12 -3.0285E+13 2.1126E+14 -1.0326E+15 3.3574E+15 -6.5236E+15 5.7319E+15
S4 6.4205E+10 -5.5748E+11 3.3051E+12 -1.3286E+13 3.4713E+13 -5.3247E+13 3.6412E+13
S5 3.6753E+10 -2.0709E+11 8.4727E+11 -2.4457E+12 4.7178E+12 -5.4530E+12 2.8536E+12
S6 -1.8843E+07 4.1135E+07 -6.4207E+07 6.9584E+07 -4.9602E+07 2.0869E+07 -3.9205E+06
Watch 27
Fig. 18a shows on-axis chromatic aberration curves of the image-taking lens group of embodiment 9, which represent deviation of convergent focuses of light rays of different wavelengths after passing through the lens. Fig. 18b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 9. Fig. 18c shows a distortion curve of the image capturing lens group of embodiment 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18d shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 9, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 18a to 18d, the imaging lens assembly according to embodiment 9 can achieve good imaging quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, improvements, equivalents, etc. within the spirit and scope of the present invention.

Claims (17)

1. An image capturing lens assembly, wherein three lens elements having optical powers are disposed in order from an object side to an image side along an optical axis, comprising:
a diaphragm;
a first lens having an optical power;
a second lens having an optical power;
a third lens having optical power;
wherein a half Semi-FOV of a maximum field angle of the photographing lens group and an effective focal length f of the photographing lens group satisfy: 1.00mm -1 <tan 2 (Semi-FOV)/f<1.50mm -1 (ii) a The effective focal length f of the camera lens group and the distance BFL from the image side surface of the third lens to the imaging surface of the camera lens group on the optical axis satisfy: 1.00<f/BFL<3.00; an on-axis distance SAG22 between the intersection point of the second lens image side surface and the optical axis and the effective radius vertex of the second lens image side surface and an on-axis distance SAG21 between the intersection point of the second lens object side surface and the optical axis and the effective radius vertex of the second lens object side surface satisfy: -4.00<SAG22/SAG21<3.00; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH is less than or equal to 1.61.
2. The image capturing lens group of claim 1, wherein: the F number Fno of the camera lens group meets the following conditions: fno is less than or equal to 1.56.
3. The camera lens group of claim 1, wherein: the combined focal length f12 of the first lens and the second lens and the curvature radius R4 of the image side surface of the second lens meet the following conditions: -5.00< f12/R4< -1.00.
4. The camera lens group of claim 1, wherein: a radius of curvature R3 of the second lens object-side surface and a radius of curvature R2 of the first lens image-side surface satisfy: 0.00< R3/R2< 3.00.
5. The camera lens group of claim 1, wherein: the central thickness CT1 of the first lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy that: 0.50< CT1/CT3< 3.00.
6. The image capturing lens group of claim 1, wherein: the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 1.00< (ET2+ ET3)/(ET3-ET2) < 5.00.
7. The camera lens group of claim 1, wherein: the effective radius DT31 of the object side surface of the third lens and the effective radius DT32 of the image side surface of the third lens satisfy the following conditional expression: 4.00< (DT31+ DT32)/(DT32-DT31) < 9.00.
8. The image capturing lens group of claim 1, wherein: the sum Sigma AT of the air intervals on the optical axis between any two adjacent lenses with focal power in the first lens to the third lens and the distance TD on the optical axis between the object side surface of the first lens and the image side surface of the third lens meet the following conditions: sigma AT/TD < 0.30.
9. The image capturing lens group of claim 1, wherein: the combined focal length f23 of the second lens and the third lens and the effective focal length f of the image pickup lens group satisfy: 0.50< f23/f < 7.00.
10. An image capturing lens assembly, wherein three lens elements having optical powers are disposed in order from an object side to an image side along an optical axis, comprising:
a diaphragm;
a first lens having an optical power;
a second lens having an optical power;
a third lens having optical power;
wherein a half of a Semi-FOV of a maximum field angle of the photographing lens group and an effective focal length f of the photographing lens group satisfy: 1.00mm -1 <tan 2 (Semi-FOV)/f<1.50mm -1 (ii) a An on-axis distance SAG22 between the intersection point of the second lens image side surface and the optical axis and the effective radius vertex of the second lens image side surface and an on-axis distance SAG21 between the intersection point of the second lens object side surface and the optical axis and the effective radius vertex of the second lens object side surface satisfy: -4.00<SAG22/SAG21<3.00; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH is less than or equal to 1.61; the F number Fno of the camera lens group meets the following requirements: fno is less than or equal to 1.56; the combined focal length f12 of the first lens and the second lens and the curvature radius R4 of the image side surface of the second lens meet the following conditions: -5.00<f12/R4<-1.00。
11. The image capturing lens assembly of claim 10, wherein: the effective focal length f of the camera lens group and the distance BFL from the image side surface of the third lens to the imaging surface of the camera lens group on the optical axis satisfy the following conditions: 1.00< f/BFL < 3.00.
12. The image capturing lens assembly of claim 10, wherein: a radius of curvature R3 of the second lens object-side surface and a radius of curvature R2 of the first lens image-side surface satisfy: 0.00< R3/R2< 3.00.
13. The image capturing lens assembly of claim 10, wherein: the central thickness CT1 of the first lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy that: 0.50< CT1/CT3< 3.00.
14. The image capturing lens assembly of claim 10, wherein: the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 1.00< (ET2+ ET3)/(ET3-ET2) < 5.00.
15. The camera lens group of claim 10, wherein: the effective radius DT31 of the object side surface of the third lens and the effective radius DT32 of the image side surface of the third lens satisfy the following conditional expression: 4.00< (DT31+ DT32)/(DT32-DT31) < 9.00.
16. The image capturing lens assembly of claim 10, wherein: the sum Sigma AT of the air intervals on the optical axis between any two adjacent lenses with optical power in the first lens to the third lens and the distance TD on the optical axis between the object side surface of the first lens and the image side surface of the third lens satisfy that: Σ AT/TD < 0.30.
17. The camera lens group of claim 10, wherein: the combined focal length f23 of the second lens and the third lens and the effective focal length f of the camera lens group satisfy that: 0.50< f23/f < 7.00.
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