CN113985572A - Image pickup lens assembly - Google Patents

Image pickup lens assembly Download PDF

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Publication number
CN113985572A
CN113985572A CN202111254751.2A CN202111254751A CN113985572A CN 113985572 A CN113985572 A CN 113985572A CN 202111254751 A CN202111254751 A CN 202111254751A CN 113985572 A CN113985572 A CN 113985572A
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China
Prior art keywords
lens
image
lens group
convex
imaging
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CN202111254751.2A
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CN113985572B (en
Inventor
管磊
娄琪琪
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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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Abstract

The present application discloses a photographing lens assembly, sequentially comprising, from an object side to an image side along an optical axis: the image side surface of the first lens is a convex surface; a second lens having a positive refractive power, the object-side surface of which is convex; a diaphragm; a third lens with focal power, wherein the image side surface of the third lens is convex; a fourth lens having a focal power, an object side surface of which is concave; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; a sixth lens having a positive refractive power, an object-side surface of which is convex; the seventh lens with negative focal power has a convex object-side surface and a concave image-side surface. At least one mirror surface from the object side surface of the first lens to the image side surface of the seventh lens is an aspheric mirror surface. The combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.50 < f12/f56 < 2.50.

Description

Image pickup lens assembly
Divisional application
The present application is a divisional application of the chinese patent application entitled "imaging lens group" filed on 15.01/2020, application No. 202010040389.8.
Technical Field
The present application relates to the field of optical elements, and in particular, to a photographing lens assembly.
Background
In recent years, the development of camera lens assemblies of portable electronic products such as mobile phones is very rapid. The camera lens assembly of portable electronic products such as mobile phones with high pixels and large image planes has become a standard for the portable electronic products such as mobile phones. Theoretically, the more the number of the lenses of the photographing lens group is, the stronger the aberration balancing capability is, and the imaging quality of the photographing lens group can be greatly improved. However, the increase in the number of lenses also increases the size of the lens, which is contrary to the trend of ultra-thin and miniaturized portable electronic products such as mobile phones.
Disclosure of Invention
The present application provides a photographing lens assembly, in order from an object side to an image side along an optical axis comprising: the image side surface of the first lens is a convex surface; a second lens having a positive refractive power, the object-side surface of which is convex; a diaphragm; a third lens with focal power, wherein the image side surface of the third lens is convex; a fourth lens having a focal power, an object side surface of which is concave; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; a sixth lens having a positive refractive power, an object-side surface of which is convex; the seventh lens with negative focal power has a convex object-side surface and a concave image-side surface.
In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface.
In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the image capturing lens group, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the image capturing lens group, and the total effective focal length f of the image capturing lens group satisfy: TTL/ImgH multiplied by f is more than 5.00mm and less than 6.00 mm.
In one embodiment, a combined focal length f56 of the fifth lens element and the sixth lens element and a distance BFL on the optical axis from the image-side surface of the seventh lens element to the imaging surface of the imaging lens group satisfy: f56/BFL is more than 1.50 and less than 5.00.
In one embodiment, the total effective focal length f of the image capturing lens group, the effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens may satisfy: 1.50 < (f/f2) + (f/f6) < 2.50.
In one embodiment, the combined focal length f12 of the first and second lenses and the combined focal length f56 of the fifth and sixth lenses may satisfy: 0.50 < f12/f56 < 2.50.
In one embodiment, the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens may satisfy: 3.00 < (R13+ R14)/(R13-R14) < 4.50.
In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 0.50 < CT1/CT7 < 2.00.
In one embodiment, the central thickness CT4 of the fourth lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis may satisfy: 0.50 < CT4/T45 < 4.50.
In one embodiment, a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens and a distance SAG21 on the optical axis from the intersection point of the object-side surface of the second lens and the optical axis to the effective radius vertex of the object-side surface of the second lens may satisfy: 1.00 < (SAG21+ SAG12)/(SAG21-SAG12) < 3.00.
In one embodiment, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens may satisfy: 1.50 < ET4/ET5 < 3.50.
In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT72 of the image-side surface of the seventh lens may satisfy: 2.50 < (DT11+ DT72)/(DT72-DT11) < 5.00.
In one embodiment, the total effective focal length f of the image capturing lens group and the radius of curvature R11 of the object side surface of the sixth lens element satisfy: f/R11 is more than 0.50 and less than 2.00.
In one embodiment, the distance TTL from the object side surface of the first lens element to the imaging surface of the imaging lens group on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging lens group satisfy: TTL/ImgH is less than 1.50.
With the above configuration, the photographing lens group according to the present application can have at least one advantageous effect of ultra-thinness, miniaturization, large image plane, high imaging quality, and the like.
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 configuration diagram of a photographing lens group according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing lens group of embodiment 1;
fig. 3 shows a schematic configuration diagram of a photographing lens group according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing lens group of embodiment 2;
fig. 5 is a schematic view showing the structure of a photographing lens group according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing lens group of embodiment 3;
fig. 7 is a schematic view showing the structure of a photographing lens group according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 4;
fig. 9 is a schematic view showing the structure of a photographing lens group according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 5;
fig. 11 is a schematic view showing the structure of a photographing lens group according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image taking lens group of embodiment 6;
fig. 13 is a schematic view showing the structure of a photographing lens group according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 7;
fig. 15 is a schematic view showing the structure of a photographing lens group according to embodiment 8 of the present application; and
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 8.
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 image capturing lens group according to an exemplary embodiment of the present application may include seven lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven 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 seventh lens may have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have a positive or negative optical power, and the image-side surface thereof may be convex; the second lens can have positive focal power, and the object side surface of the second lens can be a convex surface; the third lens can have positive focal power or negative focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have positive focal power or negative focal power, and the object side surface of the fourth lens can be a concave surface; the fifth lens can have positive focal power or negative focal power, and the image side surface of the fifth lens can be a convex surface; the sixth lens element may have a positive refractive power, and the object-side surface thereof may be convex; the seventh lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 5.00mm < TTL/ImgH x f < 6.00mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the shooting lens group on the optical axis, ImgH is half of the length of the diagonal line of the effective pixel area on the imaging surface of the shooting lens group, and f is the total effective focal length of the shooting lens group. More specifically, TTL, ImgH, and f further may satisfy: 5.10mm < TTL/ImgH x f < 5.80 mm. The lens group meets the requirements that TTL/ImgH multiplied by f is more than 5.00mm and less than 6.00mm, can effectively reduce the total size of the camera lens group while obtaining a larger focal length, and realizes the ultrathin characteristic and miniaturization of the camera lens group, thereby enabling the camera lens group to be better suitable for more and more ultrathin electronic products in the market.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.50 < f56/BFL < 5.00, wherein f56 is the combined focal length of the fifth lens and the sixth lens, and BFL is the distance from the image side surface of the seventh lens to the imaging surface of the shooting lens group on the optical axis. More specifically, f56 and BFL may further satisfy: f56/BFL is more than 1.70 and less than 4.80. Satisfying 1.50 < f56/BFL < 5.00, the size of the camera lens group can be effectively reduced, and the focal power distribution of the whole camera lens group is facilitated due to the positive focal power of the combination of the fifth lens and the sixth lens, and the excessive concentration of the focal power is avoided.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.50 < (f/f2) + (f/f6) < 2.50, where f is the total effective focal length of the image-taking lens group, f2 is the effective focal length of the second lens, and f6 is the effective focal length of the sixth lens. More specifically, f2, and f6 may further satisfy: 1.60 < (f/f2) + (f/f6) < 2.20. Satisfying 1.50 < (f/f2) + (f/f6) < 2.50, can make the lens group of making a video recording shorten the size more effectively, make the lens group of making a video recording keep ultra-thin characteristic at the same time, avoid making a video recording the excessive concentration of the lens group focal power, cooperate with other lens to make the lens group of making a video recording aberration can get better correction.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < f12/f56 < 2.50, wherein f12 is the combined focal length of the first lens and the second lens, and f56 is the combined focal length of the fifth lens and the sixth lens. More specifically, f12 and f56 may further satisfy: f12/f56 is more than 0.80 and less than 2.10. Satisfies the condition that f12/f56 is more than 0.50 and less than 2.50, can effectively reduce the aberration of the whole shooting lens group, reduce the sensitivity of the shooting lens group and avoid the poor manufacturability caused by over concentration of focal power.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 3.00 < (R13+ R14)/(R13-R14) < 4.50, wherein R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens. More specifically, R13 and R14 may further satisfy: 3.00 < (R13+ R14)/(R13-R14) < 4.30. Satisfies the requirement that 3.00 < (R13+ R14)/(R13-R14) < 4.50, can effectively correct the chromatic aberration of the photographing lens group, realize the balance of various aberrations, and effectively reduce the size of the photographing lens group, so that the focal power of the photographing lens group is reasonably distributed.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < CT1/CT7 < 2.00, wherein CT1 is the central thickness of the first lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. More specifically, CT1 and CT7 further satisfy: 0.70 < CT1/CT7 < 2.00. The requirement of 0.50 < CT1/CT7 < 2.00 is met, so that the chromatic aberration of the photographing lens group can be better balanced, the distortion of the photographing lens group can be effectively controlled, the problem of difficult processing caused by over-thin seventh lens can be effectively avoided, and the size of the photographing lens group can be reduced to keep the ultra-thin characteristic.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < CT4/T45 < 4.50, where CT4 is the central thickness of the fourth lens on the optical axis, and T45 is the separation distance between the fourth lens and the fifth lens on the optical axis. More specifically, CT4 and T45 further satisfy: 0.80 < CT4/T45 < 4.20. Satisfying 0.50 < CT4/T45 < 4.50 can effectively reduce the risk of the image capturing lens group generating ghost images, and will contribute to the reduction in size of the image capturing lens group.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.00 < (SAG21+ SAG12)/(SAG21-SAG12) < 3.00, wherein SAG12 is a distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and SAG21 is a distance on the optical axis from the intersection point of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens. The requirement that 1.00 < (SAG21+ SAG12)/(SAG21-SAG12) < 3.00 is met, the spherical aberration of the middle field of view and the coma aberration of the edge field of view can be improved, and the image pickup lens group has better aberration correction capability; but also can help to improve the effective focal length of the camera lens group on the premise of keeping the imaging quality of the camera lens group; the relative illumination of the camera lens group can be increased, and the imaging quality of the camera lens group in a dark environment is improved.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.50 < ET4/ET5 < 3.50, wherein ET4 is the edge thickness of the fourth lens and ET5 is the edge thickness of the fifth lens. More specifically, ET4 and ET5 further satisfy: 1.60 < ET4/ET5 < 3.30. Satisfies 1.50 < ET4/ET5 < 3.50, and can balance the influence quantity of the distortion of the photographing lens group while reducing the size of the photographing lens group and maintaining good processability.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2.50 < (DT11+ DT72)/(DT72-DT11) < 5.00, where DT11 is the maximum effective radius of the object side surface of the first lens and DT72 is the maximum effective radius of the image side surface of the seventh lens. More specifically, DT11 and DT72 further satisfy: 2.50 < (DT11+ DT72)/(DT72-DT11) < 4.60. Satisfy 2.50 < (DT11+ DT72)/(DT72-DT11) < 5.00, can increase the light flux of the camera lens group effectively, promote the relative illumination of the camera lens group especially the marginal field of view, make the camera lens group still have good imaging quality under the dark environment.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < f/R11 < 2.00, where f is the total effective focal length of the image pickup lens group, and R11 is the radius of curvature of the object side surface of the sixth lens element. Satisfies the requirement that f/R11 is more than 0.50 and less than 2.00, so that the camera lens group has better chromatic aberration correction capability, the sensitivity of the camera lens group is reduced, and a series of processing problems caused by poor manufacturability of the sixth lens can be effectively avoided.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: TTL/ImgH < 1.50, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens group on the optical axis, and ImgH is half of the length of the diagonal line of the effective pixel area on the imaging surface of the camera lens group. The requirements that TTL/ImgH is less than 1.50 are met, the total size of the camera lens group can be effectively reduced, and the ultra-thin characteristic and miniaturization of the camera lens group are realized, so that the camera lens group can be better suitable for more and more ultra-thin electronic products in the market.
In an exemplary embodiment, a photographing lens group according to the present application further includes a stop disposed between the second lens and the third 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 pickup lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the camera lens group can be effectively reduced, the machinability of the camera lens group is improved, and the camera lens group is more favorable for production and processing and is suitable for portable electronic products. The imaging lens group configured as described above can have features such as miniaturization, large aperture, ultra-thinness, large angle of view, large image plane, and good imaging quality.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, sixth, and seventh lenses has an object-side surface and an image-side surface that 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 seven lenses are exemplified in the embodiment, the image pickup lens group is not limited to include seven lenses. The image pickup lens group may further include other numbers of lenses if necessary.
Specific examples of the image pickup lens group applicable to the above embodiments are further described below with reference to the drawings.
Example 1
An image capturing lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an image capturing lens group according to embodiment 1 of the present application.
As shown in fig. 1, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows a basic parameter table of the image pickup lens group of embodiment 1, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).
Figure BDA0003323723360000071
TABLE 1
In the present example, the total effective focal length f of the image capturing lens group is 3.85mm, the total length TTL of the image capturing 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 S17 of the image capturing lens group) is 6.79mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image capturing lens group is 4.63mm, the aperture value Fno of the image capturing lens group is 1.87, and the maximum half field angle Semi-FOV of the image capturing lens group is 58.4 °.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 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 BDA0003323723360000081
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 S14 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.8823E-02 -3.5186E-03 1.6422E-03 -6.0836E-04 1.8388E-04 -4.1356E-05 6.1150E-06 -5.1163E-07 1.8085E-08
S2 4.2455E-02 -3.2589E-02 5.1228E-02 -5.7344E-02 4.6602E-02 -2.5818E-02 9.2325E-03 -1.9121E-03 1.7517E-04
S3 8.7196E-03 -3.9884E-03 -5.0288E-02 1.8149E-01 -2.7853E-01 2.3085E-01 -1.0020E-01 1.8024E-02 0.0000E+00
S4 -3.1135E-02 7.1826E-03 -5.0242E-03 4.2321E-03 -1.9445E-02 6.9140E-02 -1.0088E-01 6.6945E-02 -1.6320E-02
S5 -3.8409E-02 -9.5491E-03 -3.7975E-02 1.0407E-01 -1.7609E-01 1.3307E-01 -6.8170E-03 -5.1716E-02 2.1943E-02
S6 -8.7863E-02 -1.9849E-02 1.6295E-01 -5.1221E-01 9.5289E-01 -1.1178E+00 7.9319E-01 -3.1156E-01 5.1994E-02
S7 -1.8039E-01 6.7848E-02 -2.2055E-01 5.7289E-01 -8.3184E-01 7.2103E-01 -3.8299E-01 1.1796E-01 -1.6192E-02
S8 -6.4950E-02 2.1046E-02 -4.7501E-02 7.7917E-02 -6.7687E-02 3.1897E-02 -7.7712E-03 8.2283E-04 -1.2356E-05
S9 1.0029E-01 1.8395E-03 -8.9201E-02 1.0027E-01 -5.9605E-02 2.1475E-02 -4.6950E-03 5.7714E-04 -3.0948E-05
S10 -9.0391E-02 4.4683E-02 -2.2636E-02 1.0049E-02 -1.4573E-03 -5.6142E-04 2.8389E-04 -4.8002E-05 2.9495E-06
S11 -6.6096E-03 -4.8132E-03 -4.8903E-03 -5.3714E-04 2.1221E-03 -9.4223E-04 1.8774E-04 -1.7888E-05 6.6131E-07
S12 2.0611E-01 -1.0968E-01 2.2392E-02 9.6066E-04 -1.6491E-03 3.9935E-04 -4.7008E-05 2.8013E-06 -6.7562E-08
S13 -1.1392E-01 -4.0083E-02 3.1177E-02 -8.3259E-03 1.2531E-03 -1.1630E-04 6.6255E-06 -2.1329E-07 2.9778E-09
S14 -1.4011E-01 4.1436E-02 -9.6523E-03 1.7287E-03 -2.0728E-04 1.5094E-05 -6.0932E-07 1.1394E-08 -5.3081E-11
TABLE 2
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 a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the image capturing lens assembly of embodiment 1 can achieve good image quality.
Example 2
An image capturing lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. 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 configuration diagram of a photographing lens group according to embodiment 2 of the present application.
As shown in fig. 3, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image-taking lens group is 3.87mm, the total length TTL of the image-taking lens group is 6.84mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 4.60mm, the aperture value Fno of the image-taking lens group is 1.90, and the maximum half field angle Semi-FOV of the image-taking lens group is 61.0 °.
Table 3 shows a basic parameter table of the image pickup lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.
Figure BDA0003323723360000091
TABLE 3
Figure BDA0003323723360000092
Figure BDA0003323723360000101
TABLE 4
Fig. 4A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 2, which represents the deviation of the convergent focus 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 can be seen from fig. 4A to 4D, the image capturing lens assembly according to embodiment 2 can achieve good image quality.
Example 3
A photographing lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of a photographing lens group according to embodiment 3 of the present application.
As shown in fig. 5, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex 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 convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image-taking lens group is 3.90mm, the total length TTL of the image-taking lens group is 6.80mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 4.60mm, the aperture value Fno of the image-taking lens group is 1.77, and the maximum half field angle Semi-FOV of the image-taking lens group is 58.2 °.
Table 5 shows a basic parameter table of the image pickup lens group of embodiment 3, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.
Figure BDA0003323723360000111
TABLE 5
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 3.1345E-02 -1.0103E-02 5.7263E-03 -2.7023E-03 9.2944E-04 -2.1791E-04 3.2454E-05 -2.7427E-06 9.9381E-08
S2 2.0820E-02 3.0032E-02 -5.6134E-02 7.1524E-02 -5.9387E-02 3.2114E-02 -1.0782E-02 2.0339E-03 -1.6358E-04
S3 -1.9835E-02 3.9651E-02 -5.6845E-02 5.1493E-02 -9.0485E-03 -3.1212E-02 3.4185E-02 -1.4961E-02 2.5251E-03
S4 -2.5122E-02 -5.0878E-03 7.8149E-02 -2.7354E-01 5.5152E-01 -6.6802E-01 4.8284E-01 -1.9193E-01 3.2451E-02
S5 -2.8950E-02 8.5650E-03 -5.4814E-02 1.0393E-01 -1.1326E-01 4.9532E-02 1.7194E-02 -2.6254E-02 7.5087E-03
S6 -6.0536E-02 -6.0850E-03 2.6622E-02 -1.0534E-01 2.1962E-01 -2.6954E-01 1.9368E-01 -7.5603E-02 1.2305E-02
S7 -1.1632E-01 9.0070E-02 -3.3079E-01 6.9532E-01 -8.5974E-01 6.6097E-01 -3.0648E-01 7.7437E-02 -8.0789E-03
S8 -5.4254E-02 1.4753E-01 -2.7592E-01 2.8197E-01 -1.7610E-01 6.8768E-02 -1.5935E-02 1.9112E-03 -8.1460E-05
S9 -4.8121E-02 3.2771E-01 -5.1012E-01 4.4693E-01 -2.5440E-01 9.5452E-02 -2.2484E-02 2.9902E-03 -1.7088E-04
S10 -2.1941E-01 2.7521E-01 -2.9213E-01 2.2018E-01 -1.1364E-01 3.8499E-02 -7.9984E-03 9.1478E-04 -4.3993E-05
S11 1.9974E-02 -1.2470E-03 -4.0937E-02 3.7847E-02 -1.9407E-02 5.9577E-03 -1.0655E-03 1.0192E-04 -4.0210E-06
S12 2.7262E-01 -1.9734E-01 9.0499E-02 -3.1311E-02 7.6683E-03 -1.2294E-03 1.2103E-04 -6.6177E-06 1.5380E-07
S13 -1.2891E-01 -4.8007E-02 3.9125E-02 -1.0805E-02 1.6551E-03 -1.5429E-04 8.7413E-06 -2.7778E-07 3.8075E-09
S14 -2.5237E-01 8.6783E-02 -2.4182E-02 4.9820E-03 -6.9494E-04 6.2190E-05 -3.3933E-06 1.0258E-07 -1.3178E-09
TABLE 6
Fig. 6A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 3, which represents the deviation of the convergent focus 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 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 a 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 image capturing lens assembly of embodiment 3 can achieve good image quality.
Example 4
A photographing lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of a photographing lens group according to embodiment 4 of the present application.
As shown in fig. 7, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex 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 convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image-taking lens group is 3.91mm, the total length TTL of the image-taking lens group is 6.80mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 4.60mm, the aperture value Fno of the image-taking lens group is 1.80, and the maximum half field angle Semi-FOV of the image-taking lens group is 58.4 °.
Table 7 shows a basic parameter table of the image pickup lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.
Figure BDA0003323723360000121
Figure BDA0003323723360000131
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 3.1965E-02 -1.1017E-02 6.5792E-03 -3.2858E-03 1.1995E-03 -2.9907E-04 4.7395E-05 -4.2600E-06 1.6420E-07
S2 2.3652E-02 2.3009E-02 -4.5217E-02 5.9779E-02 -5.1147E-02 2.8406E-02 -9.7610E-03 1.8765E-03 -1.5287E-04
S3 -1.8359E-02 3.3742E-02 -4.6334E-02 3.3077E-02 2.0174E-02 -6.6007E-02 6.0186E-02 -2.5586E-02 4.3430E-03
S4 -2.6430E-02 -4.0731E-03 7.3787E-02 -2.6018E-01 5.3055E-01 -6.5335E-01 4.8195E-01 -1.9608E-01 3.4016E-02
S5 -2.5595E-02 -4.8285E-03 -2.0090E-02 6.1351E-02 -1.0591E-01 9.8136E-02 -4.5340E-02 6.4022E-03 1.0304E-03
S6 -5.8134E-02 -5.7264E-03 2.4551E-02 -9.5199E-02 1.9450E-01 -2.3392E-01 1.6471E-01 -6.3008E-02 1.0050E-02
S7 -1.1496E-01 4.8161E-02 -1.9310E-01 4.7206E-01 -6.5995E-01 5.6622E-01 -2.9113E-01 8.1898E-02 -9.6926E-03
S8 -6.6084E-02 1.3286E-01 -2.1501E-01 2.0486E-01 -1.2389E-01 4.7976E-02 -1.1207E-02 1.3848E-03 -6.4396E-05
S9 -4.8964E-02 2.7704E-01 -4.2153E-01 3.6515E-01 -2.0662E-01 7.7241E-02 -1.8118E-02 2.3910E-03 -1.3477E-04
S10 -2.2696E-01 2.5694E-01 -2.4691E-01 1.7192E-01 -8.2266E-02 2.5882E-02 -4.9887E-03 5.2691E-04 -2.3233E-05
S11 -4.2109E-03 2.5613E-02 -5.8975E-02 4.5631E-02 -2.1040E-02 5.9457E-03 -9.9549E-04 9.0356E-05 -3.4191E-06
S12 2.6257E-01 -2.0011E-01 9.6234E-02 -3.3738E-02 8.1576E-03 -1.2803E-03 1.2335E-04 -6.6142E-06 1.5109E-07
S13 -1.3168E-01 -4.9618E-02 4.0895E-02 -1.1412E-02 1.7636E-03 -1.6552E-04 9.4187E-06 -2.9980E-07 4.1038E-09
S14 -2.5419E-01 8.6742E-02 -2.3517E-02 4.6803E-03 -6.3245E-04 5.5071E-05 -2.9345E-06 8.6912E-08 -1.0975E-09
TABLE 8
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.
Example 5
A photographing lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of a photographing lens group according to embodiment 5 of the present application.
As shown in fig. 9, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image capturing lens group is 3.86mm, the total length TTL of the image capturing lens group is 6.84mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image capturing lens group is 4.71mm, the aperture value Fno of the image capturing lens group is 1.87, and the maximum half field angle Semi-FOV of the image capturing lens group is 52.8 °.
Table 9 shows a basic parameter table of the image pickup lens group of embodiment 5, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.
Figure BDA0003323723360000141
TABLE 9
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.2383E-02 -4.2413E-03 1.7543E-03 -5.6301E-04 1.4583E-04 -2.9458E-05 4.1658E-06 -3.4901E-07 1.2693E-08
S2 4.0148E-02 -3.1033E-02 5.3991E-02 -6.2988E-02 5.1140E-02 -2.7582E-02 9.4623E-03 -1.8674E-03 1.6279E-04
S3 1.0834E-02 -3.6807E-02 1.1034E-01 -2.2100E-01 3.2070E-01 -3.1237E-01 1.9235E-01 -6.7376E-02 1.0261E-02
S4 -2.8097E-02 2.0917E-03 1.8140E-02 -6.7562E-02 1.3165E-01 -1.4253E-01 8.2236E-02 -2.0483E-02 1.0302E-03
S5 -3.8404E-02 2.6411E-03 -1.4670E-01 5.5003E-01 -1.2130E+00 1.5818E+00 -1.2145E+00 5.0102E-01 -8.4712E-02
S6 -7.8471E-02 -4.2594E-02 2.0931E-01 -5.4561E-01 9.2747E-01 -1.0447E+00 7.2556E-01 -2.8083E-01 4.6373E-02
S7 -1.5997E-01 7.5572E-03 -1.0083E-01 4.1631E-01 -6.8846E-01 6.1876E-01 -3.3526E-01 1.0752E-01 -1.5887E-02
S8 -4.3414E-02 -3.1812E-02 2.9634E-02 -4.9965E-03 -1.7139E-03 -5.5479E-03 6.2428E-03 -2.2318E-03 2.7839E-04
S9 1.4273E-01 -5.6158E-02 -3.2930E-02 5.7539E-02 -3.5154E-02 1.2056E-02 -2.4120E-03 2.6027E-04 -1.1678E-05
S10 -5.4133E-02 1.0391E-02 2.8318E-03 -7.4203E-03 5.9361E-03 -2.0535E-03 3.5031E-04 -2.9029E-05 9.1773E-07
S11 -3.7726E-03 -5.7112E-03 -4.8326E-03 2.5074E-03 -5.7981E-04 8.9196E-05 -1.3133E-05 1.5925E-06 -8.4725E-08
S12 1.9778E-01 -1.1322E-01 3.4679E-02 -6.9287E-03 8.6502E-04 -5.3929E-05 -2.9644E-07 2.3920E-07 -9.5670E-09
S13 -1.1566E-01 -4.0781E-02 3.0935E-02 -7.9602E-03 1.1355E-03 -9.8354E-05 5.1588E-06 -1.5113E-07 1.9013E-09
S14 -2.3838E-01 7.6950E-02 -2.0128E-02 3.9077E-03 -5.1293E-04 4.3151E-05 -2.2152E-06 6.3108E-08 -7.6517E-10
Watch 10
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 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 imaging lens assembly according to embodiment 5 can achieve good imaging quality.
Example 6
A photographing lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of a photographing lens group according to embodiment 6 of the present application.
As shown in fig. 11, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image-taking lens group is 3.51mm, the total length TTL of the image-taking lens group is 6.72mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 4.55mm, the aperture value Fno of the image-taking lens group is 1.90, and the maximum half field angle Semi-FOV of the image-taking lens group is 60.9 °.
Table 11 shows a basic parameter table of the imaging lens group of embodiment 6, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.
Figure BDA0003323723360000151
Figure BDA0003323723360000161
TABLE 11
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 3.1651E-02 -1.2043E-02 8.2064E-03 -4.7131E-03 1.9461E-03 -5.3796E-04 9.3326E-05 -9.1296E-06 3.8237E-07
S2 3.2583E-02 -8.3560E-03 1.4815E-02 -1.2030E-02 2.9207E-03 3.8866E-03 -3.6445E-03 1.2346E-03 -1.5254E-04
S3 -2.9809E-03 -2.5456E-02 1.0207E-01 -2.0710E-01 2.5935E-01 -2.0066E-01 9.4003E-02 -2.4349E-02 2.7437E-03
S4 -2.8802E-02 4.9162E-03 2.4265E-02 -9.1705E-02 1.9987E-01 -2.5780E-01 1.9616E-01 -7.9318E-02 1.2831E-02
S5 -2.2007E-02 -7.7605E-02 3.4347E-01 -9.6384E-01 1.6648E+00 -1.8390E+00 1.2591E+00 -4.8926E-01 8.2673E-02
S6 -9.3022E-02 2.0446E-01 -6.5684E-01 1.3086E+00 -1.6190E+00 1.1937E+00 -4.8936E-01 9.1009E-02 -3.0453E-03
S7 -3.0291E-01 7.5383E-01 -2.0121E+00 3.5533E+00 -3.9749E+00 2.7493E+00 -1.0893E+00 1.8962E-01 8.7933E-03
S8 -6.8590E-01 1.6749E+00 -2.5009E+00 2.3257E+00 -1.3816E+00 5.2218E-01 -1.1930E-01 1.3895E-02 -1.8152E-04
S9 -8.2605E-01 2.0649E+00 -2.8222E+00 2.3474E+00 -1.2464E+00 4.2541E-01 -9.0418E-02 1.0953E-02 -6.0684E-04
S10 -1.9682E-01 3.0718E-01 -2.8785E-01 1.6211E-01 -5.7140E-02 1.2706E-02 -1.6316E-03 9.1201E-05 0.0000E+00
S11 1.1785E-01 -1.3902E-01 7.4202E-02 -2.2235E-02 2.7675E-03 2.3965E-04 -1.2089E-04 1.4332E-05 -5.9623E-07
S12 2.6694E-01 -2.5712E-01 1.4831E-01 -5.5108E-02 1.3064E-02 -1.9513E-03 1.7752E-04 -8.9842E-06 1.9407E-07
S13 -1.2025E-01 -4.1062E-02 3.2191E-02 -8.4642E-03 1.2314E-03 -1.0866E-04 5.8045E-06 -1.7317E-07 2.2186E-09
S14 -2.3725E-01 7.4041E-02 -1.7552E-02 3.0794E-03 -3.7780E-04 3.0537E-05 -1.5267E-06 4.2556E-08 -5.0521E-10
TABLE 12
Fig. 12A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 6, which represents the deviation of the convergent focus 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 a 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.
Example 7
A photographing lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an image capturing lens group according to embodiment 7 of the present application.
As shown in fig. 13, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
The first lens element E1 has negative 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 convex 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 convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image-taking lens group is 3.95mm, the total length TTL of the image-taking lens group is 6.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 4.60mm, the aperture value Fno of the image-taking lens group is 1.78, and the maximum half field angle Semi-FOV of the image-taking lens group is 52.3 °.
Table 13 shows a basic parameter table of the image pickup lens group of embodiment 7, in which the units of the radius of curvature, thickness/distance, and focal length are all 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.
Figure BDA0003323723360000171
Watch 13
Figure BDA0003323723360000172
Figure BDA0003323723360000181
TABLE 14
Fig. 14A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 7, which represents the deviation of the convergent focus 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 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 imaging lens group of embodiment 7, which represents a deviation of different image heights on the imaging plane after light passes 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.
Example 8
A photographing lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural view of a photographing lens group according to embodiment 8 of the present application.
As shown in fig. 15, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.
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 convex object-side surface S3 and a concave 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. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the image-taking lens group is 4.00mm, the total length TTL of the image-taking lens group is 5.86mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 4.30mm, the aperture value Fno of the image-taking lens group is 1.92, and the maximum half field angle Semi-FOV of the image-taking lens group is 35.4 °.
Table 15 shows a basic parameter table of the image pickup lens group of embodiment 8, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 16 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003323723360000191
Watch 15
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.4626E-02 6.7816E-03 -1.0313E-02 1.0549E-02 -7.0048E-03 2.7655E-03 -6.3823E-04 7.9488E-05 -4.1107E-06
S2 4.4273E-02 -3.4997E-03 -4.4744E-03 1.6383E-02 -1.8512E-02 1.1588E-02 -4.3458E-03 9.3679E-04 -8.7640E-05
S3 2.0396E-02 1.5642E-03 -2.8406E-02 6.4732E-02 -4.3084E-02 -2.9085E-02 6.6616E-02 -4.0488E-02 8.8538E-03
S4 -2.2285E-02 1.2599E-02 -1.0419E-01 5.0102E-01 -1.3348E+00 2.0922E+00 -1.9074E+00 9.3768E-01 -1.9183E-01
S5 -4.6569E-02 4.2323E-02 -1.8581E-01 4.4321E-01 -6.4584E-01 5.5673E-01 -2.4890E-01 3.0545E-02 9.1528E-03
S6 -1.2346E-01 9.1343E-02 -3.2001E-01 6.8871E-01 -9.4447E-01 8.9855E-01 -5.7633E-01 2.1124E-01 -3.1721E-02
S7 -1.5820E-01 1.2999E-01 -6.0857E-01 1.5328E+00 -2.3599E+00 2.4206E+00 -1.5922E+00 5.9003E-01 -9.1661E-02
S8 -4.8045E-02 8.9979E-02 -2.5008E-01 3.3412E-01 -2.6311E-01 1.3100E-01 -4.1502E-02 7.7543E-03 -6.4539E-04
S9 4.1551E-03 1.2673E-01 -2.3123E-01 2.1616E-01 -1.2284E-01 4.3596E-02 -9.4402E-03 1.1428E-03 -5.9377E-05
S10 -1.6923E-01 3.7096E-02 9.7926E-02 -1.1709E-01 6.7402E-02 -2.2483E-02 4.3777E-03 -4.6224E-04 2.0496E-05
S11 3.5179E-02 -1.3201E-01 1.2564E-01 -9.8375E-02 7.8373E-02 -5.8647E-02 3.3552E-02 -1.3472E-02 3.7252E-03
S12 2.5577E-01 -1.6924E-01 -8.9174E-02 2.6296E-01 -2.5028E-01 1.4294E-01 -5.4883E-02 1.4746E-02 -2.8084E-03
S13 -2.1189E-01 2.9196E-02 -2.0994E-02 4.3608E-02 -3.4453E-02 1.5172E-02 -4.2733E-03 8.1680E-04 -1.0870E-04
S14 -3.4929E-01 1.9392E-01 -1.1766E-01 6.6505E-02 -2.9461E-02 9.4095E-03 -2.1241E-03 3.3951E-04 -3.8509E-05
TABLE 16
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 field curvature and sagittal field 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 imaging lens group of embodiment 8, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 16A to 16D, the image capturing lens assembly according to embodiment 8 can achieve good image quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 17.
Conditions/examples 1 2 3 4 5 6 7 8
TTL/ImgH×f(mm) 5.66 5.76 5.77 5.78 5.60 5.19 5.75 5.45
f56/BFL 3.82 4.19 4.36 3.82 3.57 1.72 4.76 3.25
(f/f2)+(f/f6) 1.80 2.12 1.92 1.91 1.89 1.62 1.87 1.72
f12/f56 1.28 0.88 1.02 1.12 1.28 2.09 1.06 1.54
(R13+R14)/(R13-R14) 3.65 3.81 4.24 4.24 3.67 3.66 3.89 3.07
CT1/CT7 1.78 1.53 1.50 1.43 1.82 1.96 1.57 0.73
CT4/T45 0.92 2.29 2.28 3.82 0.85 4.19 1.82 4.17
(SAG12+SAG21)/(SAG21-SAG12) 1.29 1.28 1.26 1.18 1.37 1.11 1.56 2.90
ET4/ET5 2.34 2.37 2.23 2.81 1.64 3.21 1.62 3.08
(DT11+DT72)/(DT72-DT11) 4.50 3.64 3.90 3.75 4.30 3.32 4.01 2.59
f/R11 1.76 1.28 1.39 1.38 1.66 0.63 1.38 1.93
TTL/ImgH 1.47 1.49 1.48 1.48 1.45 1.48 1.46 1.36
TABLE 17
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described image-taking lens group.
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 (10)

1. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
the image side surface of the first lens is a convex surface;
a second lens having a positive refractive power, the object-side surface of which is convex;
a diaphragm;
a third lens with focal power, wherein the image side surface of the third lens is convex;
a fourth lens having a focal power, an object side surface of which is concave;
a fifth lens with focal power, wherein the image side surface of the fifth lens is convex;
a sixth lens having a positive refractive power, an object-side surface of which is convex; and
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface,
wherein a combined focal length f12 of the first and second lenses and a combined focal length f56 of the fifth and sixth lenses satisfy: 0.50 < f12/f56 < 2.50.
2. The imaging lens group of claim 1, wherein a combined focal length f56 of the fifth lens and the sixth lens and a distance BFL on the optical axis from an image side surface of the seventh lens to an imaging surface of the imaging lens group satisfy: f56/BFL is more than 1.50 and less than 5.00.
3. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group, the effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens satisfy: 1.50 < (f/f2) + (f/f6) < 2.50.
4. The imaging lens group of claim 2, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens group on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.50.
5. The imaging lens group of claim 1, wherein the radius of curvature R13 of the object-side surface of the seventh lens element and the radius of curvature R14 of the image-side surface of the seventh lens element satisfy: 3.00 < (R13+ R14)/(R13-R14) < 4.50.
6. The imaging lens group of claim 1, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT7 of the seventh lens on the optical axis satisfy: 0.50 < CT1/CT7 < 2.00.
7. The imaging lens group of claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.50 < CT4/T45 < 4.50.
8. The imaging lens group according to claim 1, wherein a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and a distance SAG21 on the optical axis from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens satisfy: 1.00 < (SAG21+ SAG12)/(SAG21-SAG12) < 3.00.
9. The imaging lens group of claim 1, wherein the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.50 < ET4/ET5 < 3.50.
10. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
the image side surface of the first lens is a convex surface;
a second lens having a positive refractive power, the object-side surface of which is convex;
a diaphragm;
a third lens with focal power, wherein the image side surface of the third lens is convex;
a fourth lens having a focal power, an object side surface of which is concave;
a fifth lens with focal power, wherein the image side surface of the fifth lens is convex;
a sixth lens having a positive refractive power, an object-side surface of which is convex; and
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface,
wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy: 0.50 < CT1/CT7 < 2.00.
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