CN211857037U - Image pickup lens assembly - Google Patents

Image pickup lens assembly Download PDF

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CN211857037U
CN211857037U CN202020241834.2U CN202020241834U CN211857037U CN 211857037 U CN211857037 U CN 211857037U CN 202020241834 U CN202020241834 U CN 202020241834U CN 211857037 U CN211857037 U CN 211857037U
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lens
lens group
image
imaging
satisfy
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王新权
计云兵
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 application discloses a photographing lens assembly, sequentially comprising, from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having positive optical power; and an eighth lens having a negative optical power. The combined focal length f67 of the sixth lens and the seventh lens and the distance BFL from the image side surface of the eighth lens to the imaging surface of the shooting lens group on the optical axis satisfy that: f67/BFL is more than 7.00 and less than 14.00.

Description

Image pickup lens assembly
Technical Field
The present application relates to the field of optical elements, and in particular, to a photographing lens assembly.
Background
With the development of science and technology, the market of portable electronic products such as mobile phones and the like has increased demand for portable electronic product lenses such as high-pixel mobile phones and the like. The total length of the lens is limited due to the reduction of the thickness of the portable electronic products such as the mobile phone, so that the design difficulty of the lens of the portable electronic products such as the mobile phone is increased.
Meanwhile, as the performance of a charge-coupled device (CCD) and a complementary metal-oxide semiconductor (cmos) image sensor is improved and the size thereof is reduced, the corresponding camera lens also meets the requirement of high imaging quality. In addition, whether clear imaging effect under the condition of insufficient light (such as rainy days, dusk and the like) can be met or not needs to be considered when the lens of the portable electronic product such as a mobile phone and the like is designed.
SUMMERY OF THE UTILITY MODEL
The present application provides a photographing lens assembly, in order from an object side to an image side along an optical axis comprising: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having positive optical power; and an eighth lens having a negative optical power. The combined focal length f67 of the sixth lens element and the seventh lens element and the distance BFL from the image side surface of the eighth lens element to the imaging surface of the image pickup lens group on the optical axis can satisfy the following conditions: f67/BFL is more than 7.00 and less than 14.00.
In one embodiment, at least one of the object-side surface of the first lens element to the image-side surface of the eighth lens element is an aspheric surface.
In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group, may satisfy: imgH is less than or equal to 6.00 mm.
In one embodiment, the total effective focal length f of the image capturing lens group and half of the Semi-FOV of the maximum field angle of the image capturing lens group may satisfy: f/tan of more than 8.00mm2(Semi-FOV)＜9.00mm。
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 < 1.32.
In one embodiment, the total effective focal length f of the image capturing lens group and the radius of curvature R5 of the object side surface of the third lens element satisfy: r5/f is more than 1.00 and less than 3.50.
In one embodiment, the separation distance T12 between the first lens and the second lens on the optical axis and the central thickness CT1 of the first lens on the optical axis may satisfy: 13.00 < CT1/T12 < 30.00.
In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens may satisfy: 1.50 < (R2+ R3)/(R2-R3) < 2.50.
In one embodiment, a distance SAG11 on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens and 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 may satisfy: 7.00 < SAG11/SAG12 < 10.00.
In one embodiment, the maximum effective radius DT82 of the image-side surface of the eighth lens and the maximum effective radius DT11 of the object-side surface of the first lens may satisfy: 2.00 < (DT82+ DT11)/(DT82-DT11) < 3.00.
In one embodiment, the edge thickness ET7 of the seventh lens and the edge thickness ET8 of the eighth lens may satisfy: 1.00 < ET8/ET7 < 3.00.
In one embodiment, the combined focal length f23 of the second and third lenses and the combined focal length f78 of the seventh and eighth lenses may satisfy: 0.50 < f78/f23 < 4.50.
In another aspect, the present application provides a photographing lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having positive optical power; and an eighth lens having a negative optical power. The combined focal length f23 of the second lens and the third lens and the combined focal length f78 of the seventh lens and the eighth lens may satisfy: 0.50 < f78/f23 < 4.50.
With the above configuration, the photographing lens group according to the present application can have at least one advantageous effect of ultra-thinness, miniaturization, and high imaging quality.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic 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;
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;
fig. 17 is a schematic view showing the structure of a photographing lens group according to embodiment 9 of the present application; and
fig. 18A to 18D 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 9.
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 eight lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, respectively. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any adjacent two lenses of the first lens to the eighth lens may have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a negative optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive optical power or a negative optical power; the seventh lens may have a positive optical power; the eighth lens may have a negative optical power.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: and ImgH is less than or equal to 6.00mm, wherein the ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group. The ImgH with the thickness of 6.00mm or less is satisfied, and the characteristic of a large image surface is favorably realized.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: f/tan of more than 8.00mm2(Semi-FOV) < 9.00mm, where f is the total effective focal length of the image pickup lens group, and Semi-FOV is half of the maximum field angle of the image pickup lens group. Satisfies the f/tan of 8.00mm2The (Semi-FOV) is less than 9.00mm, so that the camera lens group has the characteristics of high pixel and ultra-thin and can better balance the aberration of the camera lens group.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: TTL/ImgH < 1.32, 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 1.32 can ensure that the shooting lens group has better imaging quality and reduces the design difficulty on the premise of ensuring the total length of a thinner shooting lens group.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.00 < R5/f < 3.50, where f is the total effective focal length of the image pickup lens group, and R5 is the radius of curvature of the object side surface of the third lens element. More specifically, R5 and f further satisfy: r5/f is more than 1.10 and less than 3.20. The requirement that R5/f is more than 1.00 and less than 3.50 is met, the curvature of field and the distortion of the camera lens group can be improved, and the processing difficulty of the third lens is controlled.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 13.00 < CT1/T12 < 30.00, where T12 is the separation distance of the first lens and the second lens on the optical axis, and CT1 is the center thickness of the first lens on the optical axis. The requirements of CT1/T12 of 13.00 < 30.00 are met, the deformation caused by lens assembly is reduced, the assembly difficulty is reduced, and better imaging quality is obtained.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.50 < (R2+ R3)/(R2-R3) < 2.50, wherein R2 is the radius of curvature of the image-side surface of the first lens and R3 is the radius of curvature of the object-side surface of the second lens. More specifically, R2 and R3 may further satisfy: 1.90 < (R2+ R3)/(R2-R3) < 2.30. Satisfies 1.50 < (R2+ R3)/(R2-R3) < 2.50, can reasonably control the side deflection angle of the first lens object in the marginal field of view within a reasonable range, and can effectively reduce the sensitivity of the camera lens group.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 7.00 < f67/BFL < 14.00, wherein f67 is the combined focal length of the sixth lens element and the seventh lens element, and BFL is the distance on the optical axis from the image side surface of the eighth lens element to the image plane of the image pickup lens group. More specifically, f67 and BFL may further satisfy: f67/BFL is more than 7.30 and less than 13.50. F67/BFL is more than 7.00 and less than 14.00, which is beneficial to correcting chromatic aberration of the camera lens group and field curvature of the camera lens group, and finally improves the image quality of the camera lens group.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 7.00 & lt SAG11/SAG12 & lt 10.00, wherein SAG11 is the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, and SAG12 is the 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. More specifically, SAG11 and SAG12 further may satisfy: 7.70 < SAG11/SAG12 < 9.50. The requirements that 7.00 is more than SAG11/SAG12 is less than 10.00 are met, the first lens can be prevented from being bent too much, the processing difficulty is reduced, and meanwhile, the assembly of the camera lens group has higher stability.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2.00 < (DT82+ DT11)/(DT82-DT11) < 3.00, where DT82 is the maximum effective radius of the image-side surface of the eighth lens and DT11 is the maximum effective radius of the object-side surface of the first lens. More specifically, DT82 and DT11 further satisfy: 2.40 < (DT82+ DT11)/(DT82-DT11) < 2.70. Satisfy 2.00 < (DT82+ DT11)/(DT82-DT11) < 3.00, can prevent that the segment difference between the lens is too big, reduce the equipment degree of difficulty, guarantee the MTF performance after the equipment.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.00 < ET8/ET7 < 3.00, wherein ET7 is the edge thickness of the seventh lens and ET8 is the edge thickness of the eighth lens. More specifically, ET8 and ET7 further satisfy: 1.20 < ET8/ET7 < 2.70. The requirements of ET8/ET7 of 1.00 < ET8/ET7 < 3.00 are met, aberration can be effectively controlled, the image pickup lens group can obtain better imaging quality, and the stability of lens assembly and the miniaturization of the lens are more convenient.
In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < f78/f23 < 4.50, wherein f23 is the combined focal length of the second lens and the third lens, and f78 is the combined focal length of the seventh lens and the eighth lens. More specifically, f78 and f23 may further satisfy: 0.90 < f78/f23 < 4.40. Satisfies the condition that f78/f23 is more than 0.50 and less than 4.50, is favorable for better balancing aberration of the camera lens group and simultaneously is favorable for improving the resolving power of the camera lens group.
In an exemplary embodiment, a photographing lens group according to the present application further includes a diaphragm disposed between an object side and an object side surface of the first lens or a diaphragm disposed between the first lens and the second 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, eight 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 camera lens group with the configuration has the characteristics of large aperture, large image surface, ultra-thin property, good imaging quality and the like.
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 eighth 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, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens has an object-side surface and an image-side surface which 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 eight lenses are exemplified in the embodiment, the image pickup lens group is not limited to include eight 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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
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 DEST_PATH_GDA0002598843190000061
Figure DEST_PATH_GDA0002598843190000071
TABLE 1
In the present example, the total effective focal length f of the image-taking lens group is 6.72mm, the total length TTL of the image-taking 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 S19 of the image-taking lens group) is 7.86mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.26mm, the half Semi-FOV of the maximum angle of view of the image-taking lens group is 42.16 °, and the aperture value Fno of the image-taking lens group is 1.59.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 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 DEST_PATH_GDA0002598843190000072
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 S16 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
Figure DEST_PATH_GDA0002598843190000073
Figure DEST_PATH_GDA0002598843190000081
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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave 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 positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.62mm, the total length TTL of the image-taking lens group is 7.86mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.10mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.36 °, and the aperture value Fno of the image-taking lens group is 1.55.
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 DEST_PATH_GDA0002598843190000091
TABLE 3
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.3703E-03 2.0261E-03 -2.1114E-03 1.4257E-03 -5.8666E-04 1.4879E-04 -2.3109E-05 2.0884E-06 -9.8799E-08
S2 1.0997E-02 -1.4641E-02 1.5777E-02 -1.2626E-02 7.2340E-03 -2.9041E-03 7.8941E-04 -1.3755E-04 1.3777E-05
S3 -7.8383E-03 -1.1654E-02 1.4853E-02 -1.0490E-02 4.8550E-03 -1.4758E-03 2.8376E-04 -3.1726E-05 1.6061E-06
S4 -1.1493E-02 -2.8137E-03 8.2749E-03 -7.7274E-03 5.1987E-03 -2.5472E-03 8.5870E-04 -1.6873E-04 1.3947E-05
S5 5.3103E-04 -1.0931E-03 3.4367E-03 -4.8448E-03 5.1787E-03 -3.2692E-03 1.2414E-03 -2.5348E-04 2.1150E-05
S6 -3.6905E-03 5.8783E-03 -1.1359E-02 1.6909E-02 -1.5503E-02 9.4861E-03 -3.8120E-03 9.7988E-04 -1.4705E-04
S7 -2.5466E-02 1.1662E-02 -2.4107E-02 2.7509E-02 -2.1157E-02 1.0592E-02 -3.2888E-03 5.7260E-04 -4.2627E-05
S8 -2.5674E-02 2.5664E-03 2.6272E-04 -4.3840E-03 4.5275E-03 -2.3894E-03 7.2616E-04 -1.2081E-04 8.5823E-06
S9 -2.3038E-02 -6.1844E-03 6.2091E-03 -3.3578E-03 1.1536E-03 -2.9050E-04 5.5612E-05 -7.0948E-06 4.1428E-07
S10 -3.3023E-03 -1.7738E-02 1.2735E-02 -5.4481E-03 1.4590E-03 -2.4127E-04 2.3281E-05 -1.1575E-06 2.1374E-08
S11 2.5758E-02 -2.8070E-02 1.4398E-02 -4.5288E-03 8.1064E-04 -6.2207E-05 -3.7325E-06 1.1876E-06 -9.1640E-08
S12 1.1971E-02 -2.9810E-02 1.7535E-02 -5.6591E-03 9.8896E-04 -4.7988E-05 -1.8246E-05 4.7819E-06 -5.7063E-07
S13 4.3119E-03 -1.7870E-02 8.6835E-03 -4.0983E-03 1.7297E-03 -5.3088E-04 1.1117E-04 -1.5925E-05 1.5774E-06
S14 2.0101E-02 -9.7103E-03 2.4011E-04 2.2360E-05 3.0630E-04 -1.5224E-04 3.6090E-05 -5.2348E-06 5.0393E-07
S15 -5.7867E-02 3.4813E-02 -1.9943E-02 7.6624E-03 -1.8349E-03 2.8670E-04 -3.0309E-05 2.1963E-06 -1.0762E-07
S16 -6.3617E-02 2.9941E-02 -1.2883E-02 3.9152E-03 -8.0258E-04 1.1359E-04 -1.1396E-05 8.2332E-07 -4.2990E-08
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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave 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 positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.65mm, the total length TTL of the image-taking lens group is 7.86mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.02mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 40.87 °, and the aperture value Fno of the image-taking lens group is 1.57.
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 DEST_PATH_GDA0002598843190000101
Figure DEST_PATH_GDA0002598843190000111
TABLE 5
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.7894E-03 8.8771E-04 -6.0733E-04 2.4623E-04 -1.7624E-05 -2.0259E-05 6.8137E-06 -7.7522E-07 1.4064E-08
S2 9.8951E-03 -1.1705E-02 1.0933E-02 -7.6004E-03 3.8581E-03 -1.4231E-03 3.6950E-04 -6.3534E-05 6.4160E-06
S3 -8.9598E-03 -8.6000E-03 1.0630E-02 -6.7123E-03 2.6486E-03 -6.5506E-04 9.7432E-05 -8.2247E-06 3.4391E-07
S4 -1.2870E-02 1.2601E-03 1.1254E-03 5.7773E-04 -9.7955E-04 3.7140E-04 1.3303E-05 -3.2831E-05 4.7432E-06
S5 7.8012E-06 -4.9077E-04 2.2527E-03 -2.8954E-03 3.3694E-03 -2.2854E-03 9.2925E-04 -2.0120E-04 1.7659E-05
S6 -3.4803E-03 6.0477E-03 -1.1190E-02 1.6058E-02 -1.4318E-02 8.6334E-03 -3.4644E-03 8.9971E-04 -1.3737E-04
S7 -2.4570E-02 1.0545E-02 -2.2756E-02 2.6614E-02 -2.1070E-02 1.0834E-02 -3.4493E-03 6.1587E-04 -4.7069E-05
S8 -2.4662E-02 1.2731E-03 1.1901E-03 -4.5855E-03 4.2809E-03 -2.1641E-03 6.4352E-04 -1.0595E-04 7.5081E-06
S9 -2.1463E-02 -6.3358E-03 4.5752E-03 -1.7619E-03 3.7103E-04 -6.3611E-05 1.6573E-05 -3.3960E-06 2.6487E-07
S10 -2.0913E-03 -1.7486E-02 1.1388E-02 -4.4724E-03 1.0928E-03 -1.5947E-04 1.2388E-05 -3.6214E-07 -3.0442E-09
S11 2.1348E-02 -2.2086E-02 1.0468E-02 -3.0101E-03 4.3637E-04 -5.1724E-07 -1.0630E-05 1.6947E-06 -1.1377E-07
S12 2.3754E-03 -2.0693E-02 1.2046E-02 -3.3996E-03 3.0006E-04 1.1157E-04 -4.5760E-05 8.1806E-06 -8.5819E-07
S13 -8.8987E-04 -1.4266E-02 6.8759E-03 -3.2698E-03 1.4095E-03 -4.3903E-04 9.2522E-05 -1.3259E-05 1.3092E-06
S14 1.9550E-02 -1.0058E-02 7.1148E-04 -1.2409E-04 3.0880E-04 -1.4311E-04 3.3419E-05 -4.8336E-06 4.6637E-07
S15 -5.3828E-02 2.9078E-02 -1.5752E-02 5.8845E-03 -1.3609E-03 2.0234E-04 -1.9895E-05 1.2854E-06 -5.0795E-08
S16 -6.0190E-02 2.6085E-02 -1.0676E-02 3.1625E-03 -6.3531E-04 8.7986E-05 -8.6051E-06 6.0295E-07 -3.0340E-08
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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave 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 convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.63mm, the total length TTL of the image-taking lens group is 7.92mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S19 of the image-taking lens group is 6.22mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.86 °, and the aperture value Fno of the image-taking lens group is 1.55.
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 DEST_PATH_GDA0002598843190000121
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.8997E-03 1.9368E-04 5.9825E-04 -8.9093E-04 6.2238E-04 -2.4405E-04 5.4512E-05 -6.4605E-06 3.0599E-07
S2 9.4525E-03 -1.2968E-02 1.3558E-02 -9.9138E-03 4.8413E-03 -1.5604E-03 3.2733E-04 -4.3323E-05 3.3144E-06
S3 -1.0874E-02 -8.3647E-03 1.4129E-02 -1.2170E-02 6.5652E-03 -2.2077E-03 4.4789E-04 -5.0425E-05 2.4459E-06
S4 -1.3866E-02 -1.7938E-03 1.2127E-02 -1.5217E-02 1.1252E-02 -5.1684E-03 1.4788E-03 -2.4084E-04 1.6894E-05
S5 -1.1954E-03 -1.6792E-03 6.2069E-03 -8.2358E-03 6.9334E-03 -3.5487E-03 1.1348E-03 -2.0409E-04 1.5549E-05
S6 -3.2297E-03 -1.2366E-03 9.7570E-03 -1.7826E-02 2.0142E-02 -1.4205E-02 6.3549E-03 -1.7366E-03 2.6313E-04
S7 -1.9048E-02 -1.3880E-03 1.5639E-03 -4.8059E-03 5.0519E-03 -2.9575E-03 1.0138E-03 -1.9134E-04 1.5472E-05
S8 -1.6838E-02 -6.8764E-03 1.1791E-02 -1.4511E-02 1.0545E-02 -4.7312E-03 1.2940E-03 -1.9820E-04 1.3097E-05
S9 -1.5058E-02 -1.4170E-02 1.4252E-02 -9.0335E-03 3.8043E-03 -1.0908E-03 2.0326E-04 -2.1913E-05 1.0231E-06
S10 2.8757E-03 -2.2976E-02 1.5300E-02 -6.0840E-03 1.5141E-03 -2.3687E-04 2.2712E-05 -1.2371E-06 3.0042E-08
S11 3.3388E-02 -3.1356E-02 1.3988E-02 -3.5320E-03 3.9374E-04 2.4729E-05 -1.3671E-05 1.7704E-06 -1.0407E-07
S12 2.2307E-02 -3.2545E-02 1.6327E-02 -4.6392E-03 7.2792E-04 -3.3811E-05 -1.0831E-05 2.7462E-06 -3.1980E-07
S13 7.9750E-03 -1.6722E-02 7.0334E-03 -3.7202E-03 1.7931E-03 -5.8355E-04 1.2467E-04 -1.7944E-05 1.7761E-06
S14 1.5583E-02 -1.1443E-03 -5.1483E-03 2.0826E-03 -3.0409E-04 -6.7755E-06 9.5609E-06 -1.6838E-06 1.6268E-07
S15 -4.4682E-02 2.7503E-02 -1.2753E-02 3.2353E-03 -3.4714E-04 -2.1350E-05 1.2118E-05 -1.8507E-06 1.6429E-07
S16 -6.0492E-02 2.9698E-02 -1.1390E-02 2.8670E-03 -4.7760E-04 5.3930E-05 -4.1547E-06 2.1288E-07 -6.5654E-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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave 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 positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.66mm, the total length TTL of the image-taking lens group is 7.85mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.22mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.70 °, and the aperture value Fno of the image-taking lens group is 1.56.
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 DEST_PATH_GDA0002598843190000141
TABLE 9
Figure DEST_PATH_GDA0002598843190000142
Figure DEST_PATH_GDA0002598843190000151
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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.60mm, the total length TTL of the image-taking lens group is 7.82mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S19 of the image-taking lens group is 6.22mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.96 °, and the aperture value Fno of the image-taking lens group is 1.54.
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 DEST_PATH_GDA0002598843190000152
Figure DEST_PATH_GDA0002598843190000161
TABLE 11
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.0737E-03 2.1610E-04 3.9194E-04 -6.4578E-04 4.7121E-04 -1.9078E-04 4.3697E-05 -5.3003E-06 2.5421E-07
S2 1.0339E-02 -1.2987E-02 1.1474E-02 -7.0594E-03 2.9619E-03 -8.3046E-04 1.4844E-04 -1.5611E-05 7.9316E-07
S3 -8.1714E-03 -1.0908E-02 1.3315E-02 -8.9596E-03 4.0202E-03 -1.1996E-03 2.2656E-04 -2.4683E-05 1.2052E-06
S4 -1.2061E-02 -8.6579E-04 4.9351E-03 -3.9923E-03 2.4071E-03 -1.1419E-03 4.0532E-04 -8.5888E-05 7.5438E-06
S5 -4.0276E-04 1.9498E-03 -2.5631E-03 3.0589E-03 -1.4084E-03 1.8110E-04 1.4362E-04 -6.0804E-05 6.9033E-06
S6 -3.5714E-03 2.8157E-03 -3.5144E-03 6.6627E-03 -7.2060E-03 5.1278E-03 -2.3235E-03 6.6382E-04 -1.1018E-04
S7 -2.5728E-02 1.1699E-02 -2.0679E-02 1.8763E-02 -1.1118E-02 4.1835E-03 -9.3932E-04 1.0929E-04 -4.4089E-06
S8 -2.4732E-02 4.8191E-03 -4.9670E-03 1.2323E-03 7.6333E-04 -7.9862E-04 3.1566E-04 -6.1788E-05 4.9746E-06
S9 -2.7023E-02 -8.5694E-04 2.4714E-03 -1.5122E-03 5.4096E-04 -1.7153E-04 4.5110E-05 -7.1245E-06 4.5973E-07
S10 -7.6677E-03 -1.3470E-02 1.0241E-02 -4.3398E-03 1.0984E-03 -1.6389E-04 1.3321E-05 -4.7067E-07 1.9916E-09
S11 2.9562E-02 -3.2065E-02 1.6474E-02 -5.1717E-03 9.3589E-04 -7.8922E-05 -2.0365E-06 1.0550E-06 -8.4881E-08
S12 2.2511E-02 -3.8002E-02 2.1541E-02 -7.1291E-03 1.4454E-03 -1.6689E-04 5.4962E-06 1.4091E-06 -2.4565E-07
S13 7.2208E-03 -1.8285E-02 7.0396E-03 -3.0673E-03 1.4203E-03 -4.7792E-04 1.0637E-04 -1.5864E-05 1.6171E-06
S14 1.8084E-02 -3.9023E-03 -4.3702E-03 1.8738E-03 -1.4377E-04 -8.0123E-05 2.8056E-05 -4.5820E-06 4.6298E-07
S15 -7.7943E-02 6.5004E-02 -4.0761E-02 1.5997E-02 -3.9808E-03 6.6331E-04 -7.6951E-05 6.3478E-06 -3.7460E-07
S16 -8.2731E-02 5.0947E-02 -2.4318E-02 7.6733E-03 -1.6202E-03 2.3758E-04 -2.4894E-05 1.8930E-06 -1.0481E-07
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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave 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 convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.60mm, the total length TTL of the image-taking lens group is 7.88mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.02mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.14 °, and the aperture value Fno of the image-taking lens group is 1.58.
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 DEST_PATH_GDA0002598843190000171
Figure DEST_PATH_GDA0002598843190000181
Watch 13
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.9357E-03 1.5356E-03 -2.4657E-03 2.6308E-03 -1.6423E-03 6.2292E-04 -1.4163E-04 1.7778E-05 -9.5764E-07
S2 -3.0569E-03 4.0857E-03 -2.2414E-04 -3.6895E-03 4.1920E-03 -2.4024E-03 8.1399E-04 -1.6455E-04 1.8362E-05
S3 -2.5199E-02 1.4486E-02 -8.5148E-03 3.8976E-03 -1.1431E-03 1.6198E-04 8.6866E-06 -6.5233E-06 6.6555E-07
S4 -1.9478E-02 9.5734E-03 -7.7822E-04 -5.1950E-03 6.9575E-03 -4.4906E-03 1.6312E-03 -3.1383E-04 2.4672E-05
S5 -1.8008E-03 -5.1969E-03 1.0479E-02 -1.3796E-02 1.2119E-02 -6.6309E-03 2.2332E-03 -4.1721E-04 3.2934E-05
S6 -3.2071E-03 2.3094E-03 -7.3952E-03 1.0095E-02 -7.4380E-03 3.2487E-03 -7.6867E-04 7.8548E-05 5.4808E-07
S7 -1.7700E-02 -3.0988E-05 -7.8003E-03 1.1764E-02 -1.1586E-02 6.9438E-03 -2.4777E-03 4.8529E-04 -4.0312E-05
S8 -1.6122E-02 -7.5393E-03 1.0754E-02 -1.2040E-02 8.1128E-03 -3.4732E-03 9.2752E-04 -1.4040E-04 9.2033E-06
S9 -9.3364E-03 -2.7281E-02 2.2923E-02 -1.0930E-02 3.2671E-03 -6.7323E-04 1.0089E-04 -1.0059E-05 4.7201E-07
S10 1.4933E-02 -3.7500E-02 2.2095E-02 -7.3966E-03 1.4432E-03 -1.4849E-04 4.5669E-06 4.3121E-07 -3.0046E-08
S11 1.1618E-02 -3.8991E-03 -7.0274E-03 6.0251E-03 -2.3557E-03 5.4804E-04 -7.9555E-05 6.9935E-06 -3.3586E-07
S12 -4.3605E-02 2.3927E-02 -1.4685E-02 7.1426E-03 -2.5081E-03 6.1485E-04 -1.0143E-04 1.0698E-05 -6.5253E-07
S13 -2.8095E-02 5.1318E-03 -1.4868E-03 -5.4673E-04 6.4803E-04 -2.4844E-04 5.3611E-05 -7.3829E-06 6.8217E-07
S14 1.5291E-02 -1.2134E-02 5.9116E-03 -3.4284E-03 1.4774E-03 -4.1266E-04 7.6663E-05 -9.7960E-06 8.7666E-07
S15 -3.4749E-02 8.2014E-03 -6.6151E-05 -1.3285E-03 6.8221E-04 -1.7630E-04 2.8225E-05 -3.0249E-06 2.2425E-07
S16 -4.2463E-02 1.1403E-02 -2.3842E-03 1.7079E-04 6.7189E-05 -2.4641E-05 4.1664E-06 -4.4099E-07 3.1449E-08
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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 concave 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 convex object-side surface S9 and a concave 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 positive power, and has a convex object-side surface S13 and a convex image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.60mm, the total length TTL of the image-taking lens group is 7.88mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.02mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.16 °, and the aperture value Fno of the image-taking lens group is 1.57.
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 DEST_PATH_GDA0002598843190000191
Watch 15
Figure DEST_PATH_GDA0002598843190000192
Figure DEST_PATH_GDA0002598843190000201
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.
Example 9
A photographing lens group according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an image capturing lens group according to embodiment 9 of the present application.
As shown in fig. 17, the image capturing lens assembly, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S19.
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 negative 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 convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the image-taking lens group is 6.60mm, the total length TTL of the image-taking lens group is 7.90mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the image-taking lens group is 6.00mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 41.09 °, and the aperture value Fno of the image-taking lens group is 1.65.
Table 17 shows a basic parameter table of the image pickup lens group of embodiment 9, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 18 shows high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure DEST_PATH_GDA0002598843190000211
TABLE 17
Figure DEST_PATH_GDA0002598843190000212
Figure DEST_PATH_GDA0002598843190000221
Watch 18
Fig. 18A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 9, which represents the deviation of the convergent focus 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 a 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.
In summary, examples 1 to 9 each satisfy the relationship shown in table 19.
Conditions/examples 1 2 3 4 5 6 7 8 9
f/tan2(Semi-FOV) 8.20 8.54 8.89 8.26 8.39 8.16 8.65 8.63 8.69
TTL/ImgH 1.26 1.29 1.31 1.27 1.26 1.26 1.31 1.31 1.317
ImgH 6.26 6.10 6.02 6.22 6.22 6.22 6.02 6.02 6.00
R5/f 1.37 1.47 1.28 1.23 1.36 1.37 1.17 1.20 3.19
CT1/T12 28.18 15.17 14.66 22.76 18.10 17.45 13.76 21.02 19.08
(R2+R3)/(R2-R3) 2.28 2.13 2.12 2.10 2.17 2.25 2.22 2.25 1.97
f67/BFL 10.75 10.44 10.96 13.45 11.26 10.38 8.96 7.38 8.17
SAG11/SAG12 8.26 8.63 8.43 9.43 8.50 8.39 8.26 8.39 7.73
(DT82+DT11)/(DT82-DT11) 2.55 2.50 2.56 2.63 2.50 2.59 2.48 2.42 2.45
ET8/ET7 2.30 2.42 2.14 2.27 2.39 1.93 2.61 2.46 1.21
f78/f23 0.98 1.26 1.57 0.93 1.07 1.10 2.27 1.00 4.35
Watch 19
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 (21)

1. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
a first lens having a positive optical power;
a second lens having a negative optical power;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens having optical power;
a sixth lens having optical power;
a seventh lens having positive optical power; and
an eighth lens having a negative optical power;
a combined focal length f67 of the sixth lens element and the seventh lens element and a distance BFL on the optical axis from an image side surface of the eighth lens element to an imaging surface of the image pickup lens group satisfy: f67/BFL is more than 7.00 and less than 14.00.
2. The imaging lens group of claim 1, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group, satisfies: imgH is less than or equal to 6.00 mm.
3. The imaging lens group according to claim 1, wherein the total effective focal length f of the imaging lens group and half of the Semi-FOV of the maximum field angle of the imaging lens group satisfy: f/tan of more than 8.00mm2(Semi-FOV)＜9.00mm。
4. The imaging lens group of claim 1, 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 of the imaging lens group satisfy: TTL/ImgH < 1.32.
5. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group and the radius of curvature R5 of the object side surface of the third lens satisfy: r5/f is more than 1.00 and less than 3.50.
6. The imaging lens group of claim 1, wherein a separation distance T12 between the first and second lenses on the optical axis and a center thickness CT1 of the first lens on the optical axis satisfy: 13.00 < CT1/T12 < 30.00.
7. The imaging lens group of claim 1, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 1.50 < (R2+ R3)/(R2-R3) < 2.50.
8. The image capturing lens group according to claim 1, wherein a distance SAG11 on the optical axis from an intersection point of the object side surface of the first lens and the optical axis to an effective radius vertex of the object side surface of the first lens to 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 satisfies: 7.00 < SAG11/SAG12 < 10.00.
9. The imaging lens group of claim 1, wherein the maximum effective radius DT82 of the image side surface of the eighth lens and the maximum effective radius DT11 of the object side surface of the first lens satisfy: 2.00 < (DT82+ DT11)/(DT82-DT11) < 3.00.
10. The imaging lens group of claim 1, wherein the edge thickness ET7 of the seventh lens element and the edge thickness ET8 of the eighth lens element satisfy: 1.00 < ET8/ET7 < 3.00.
11. The image capturing lens group according to claim 1, wherein a combined focal length f23 of the second lens and the third lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: 0.50 < f78/f23 < 4.50.
12. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
a first lens having a positive optical power;
a second lens having a negative optical power;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens having optical power;
a sixth lens having optical power;
a seventh lens having positive optical power; and
an eighth lens having a negative optical power;
a combined focal length f23 of the second lens and the third lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: 0.50 < f78/f23 < 4.50.
13. The imaging lens group of claim 12, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group, satisfies: imgH is less than or equal to 6.00 mm.
14. The imaging lens group according to claim 12, wherein the total effective focal length f of the imaging lens group and half of the Semi-FOV of the maximum field angle of the imaging lens group satisfy: f/tan of more than 8.00mm2(Semi-FOV)＜9.00mm。
15. The imaging lens group of claim 12, 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 of the imaging lens group satisfy: TTL/ImgH < 1.32.
16. The imaging lens group of claim 12, wherein the total effective focal length f of the imaging lens group and the radius of curvature R5 of the object side surface of the third lens satisfy: r5/f is more than 1.00 and less than 3.50.
17. The imaging lens group of claim 12, wherein a separation distance T12 between the first and second lenses on the optical axis and a center thickness CT1 of the first lens on the optical axis satisfy: 13.00 < CT1/T12 < 30.00.
18. The imaging lens group of claim 12, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 1.50 < (R2+ R3)/(R2-R3) < 2.50.
19. The image capturing lens group according to claim 12, wherein a distance SAG11 on the optical axis from an intersection point of the object side surface of the first lens and the optical axis to an effective radius vertex of the object side surface of the first lens to 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 satisfies: 7.00 < SAG11/SAG12 < 10.00.
20. The imaging lens group of claim 12, wherein the maximum effective radius DT82 of the image side surface of the eighth lens and the maximum effective radius DT11 of the object side surface of the first lens satisfy: 2.00 < (DT82+ DT11)/(DT82-DT11) < 3.00.
21. The imaging lens group of claim 12, wherein the edge thickness ET7 of the seventh lens element and the edge thickness ET8 of the eighth lens element satisfy: 1.00 < ET8/ET7 < 3.00.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021073275A1 (en) * 2019-10-17 2021-04-22 浙江舜宇光学有限公司 Optical imaging lens
WO2022226888A1 (en) * 2021-04-29 2022-11-03 江西晶超光学有限公司 Optical system, camera module and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021073275A1 (en) * 2019-10-17 2021-04-22 浙江舜宇光学有限公司 Optical imaging lens
WO2022226888A1 (en) * 2021-04-29 2022-11-03 江西晶超光学有限公司 Optical system, camera module and electronic device

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