CN209979916U - Optical imaging system - Google Patents

Optical imaging system Download PDF

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CN209979916U
CN209979916U CN201920667878.9U CN201920667878U CN209979916U CN 209979916 U CN209979916 U CN 209979916U CN 201920667878 U CN201920667878 U CN 201920667878U CN 209979916 U CN209979916 U CN 209979916U
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lens
imaging system
optical imaging
image
satisfy
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叶丽慧
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 application discloses an optical imaging system, which comprises in order from an object side to an image side along an optical axis: 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 having optical power. The object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the third lens and the sixth lens each have positive optical power. The curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens meet 0.5 < R11/R12 < 1.5.

Description

Optical imaging system
Technical Field
The present application relates to an optical imaging system, and more particularly, to an optical imaging system including eight lenses.
Background
In recent years, with the development of scientific technology, the demand of the market for an image pickup lens suitable for portable electronic products has been increasing. The rapid development of the lens module of the mobile phone, especially the popularization of the large-size and high-pixel CMOS chip, makes the mobile phone manufacturer put forward more stringent requirements on the imaging quality of the lens. In addition, as the performance and size of CCD and cmos devices are improved and reduced, higher requirements are also placed on the high imaging quality and miniaturization of the associated imaging system.
In order to meet the miniaturization requirement and the imaging requirement, an optical imaging system which can achieve both miniaturization and large image plane, large viewing angle and high resolution is required.
SUMMERY OF THE UTILITY MODEL
The present application provides an optical imaging system applicable to portable electronic products that may address, at least in part, at least one of the above-identified deficiencies in the prior art.
The present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: 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 having optical power. The object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the object side surface of the fourth lens can be a convex surface, and the image side surface can be a concave surface; the object side surface of the fifth lens can be a concave surface, and the image side surface can be a convex surface; the third lens and the sixth lens can both have positive focal power.
In one embodiment, half of the Semi-FOV of the maximum field angle of the optical imaging system may satisfy Semi-FOV ≧ 48.
In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging system on an optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging system may satisfy 1.0 < TTL/ImgH < 1.5.
In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens can satisfy 1.0 < | f2|/f1 < 2.5.
In one embodiment, the eighth lens may have a negative optical power.
In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f8 of the eighth lens may satisfy 0.5 < f4/f8 < 2.0.
In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy 0.5 < R3/R4 < 1.5.
In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens may satisfy 2.0 < R7/R8 < 2.5.
In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a radius of curvature R10 of the image-side surface of the fifth lens may satisfy 0.5 < R10/R9 < 1.5.
In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R1 of the object-side surface of the first lens may satisfy 1.0 < R2/R1 < 2.0.
In one embodiment, a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R12 of an image-side surface of the sixth lens may satisfy 0.5 < R11/R12 < 1.5.
In one embodiment, the radius of curvature R15 of the object-side surface of the eighth lens and the radius of curvature R16 of the image-side surface of the eighth lens satisfy-2.5 < R15/R16 < -1.
In one embodiment, the central thickness CT1 of the first lens on the optical axis and the separation distance T12 of the first lens and the second lens on the optical axis may satisfy 3 < CT1/T12 < 4.5.
In one embodiment, a central thickness CT3 of the third lens on the optical axis and a central thickness CT5 of the fifth lens on the optical axis may satisfy 2.5 < CT3/CT5 < 3.0.
In one embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy 3.5 < T45/CT4 < 4.5.
In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens can satisfy 1.0 < f/f3 < 2.0.
In one embodiment, the refractive index N3 of the third lens may satisfy N3 > 1.7.
In one embodiment, the Abbe number V3 of the third lens can satisfy V3 ≧ 45.6.
In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f/EPD < 2.5.
In one embodiment, ImgH of half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system may satisfy ImgH > 4.8 mm.
This application has adopted eight lenses, through the reasonable collocation of the lens of different materials and the focal power of rational distribution each lens, face type, the central thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging system has at least one beneficial effect such as big image plane, big visual angle, high resolution.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an optical imaging system 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 optical imaging system of embodiment 1;
fig. 3 shows a schematic configuration diagram of an optical imaging system 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 chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 2;
fig. 5 shows a schematic configuration diagram of an optical imaging system 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 chromatic aberration of magnification curve, respectively, of the optical imaging system of embodiment 3;
fig. 7 shows a schematic configuration diagram of an optical imaging system 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 optical imaging system of embodiment 4;
fig. 9 shows a schematic configuration diagram of an optical imaging system 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 optical imaging system of embodiment 5;
fig. 11 shows a schematic configuration diagram of an optical imaging system 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 optical imaging system of embodiment 6;
fig. 13 is a schematic structural view showing an optical imaging system 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 optical imaging system of embodiment 7;
fig. 15 shows a schematic configuration diagram of an optical imaging system 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 optical imaging system 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 optical imaging system according to an exemplary embodiment of the present application may include, for example, eight lenses having optical powers, i.e., 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. The eight lenses are arranged in order from an object side to an image side along an optical axis. In the first to eighth lenses, any adjacent two lenses may have an air space therebetween.
In an exemplary embodiment, the first lens has a positive or negative power; the second lens has positive focal power or negative focal power, the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens may have a positive optical power; the fourth lens has positive focal power or negative focal power, and the object side surface of the fourth lens can be a convex surface, and the image side surface of the fourth lens can be a concave surface; the fifth lens has positive focal power or negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens may have a positive optical power; the seventh lens has positive focal power or negative focal power; the eighth lens may have a negative optical power. The low-order aberration of the control system is effectively balanced by reasonably controlling the positive and negative distribution of the focal power of each component of the system and the lens surface curvature. When the focal power of the third lens is positive, the correction of the off-axis aberration of the optical lens group is facilitated, and the imaging quality is improved; when the focal power of the eighth lens is negative, the wide field of view can be shared effectively, a larger field angle range can be obtained, and the collection capability of the optical system on object information can be improved.
In an exemplary embodiment, the first lens may have a positive optical power.
In an exemplary embodiment, the image side surface of the third lens may be convex.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression Semi-FOV ≧ 48 °, where Semi-FOV is half of the maximum field angle of the optical imaging system. More specifically, the Semi-FOV may further satisfy 48.9 ≦ Semi-FOV ≦ 51.7. The Semi-FOV is more than or equal to 48 degrees, and the imaging system has a larger field angle range.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < TTL/ImgH < 1.5, where TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging system. More specifically, TTL and ImgH can further satisfy 1.0 < TTL/ImgH < 1.3, e.g., 1.11 ≦ TTL/ImgH ≦ 1.18. The requirement of miniaturization of an imaging system is met by controlling the ratio of TTL to ImgH.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < | f2|/f1 < 2.5, where f2 is an effective focal length of the second lens and f1 is an effective focal length of the first lens. More specifically, f2 and f1 can further satisfy 1.38 ≦ f2|/f1 ≦ 2.29. The optical imaging system satisfies 1.0 < | f2|/f1 < 2.5, and the object side end has enough convergence capacity to adjust the focusing position of the light beam, thereby shortening the total length of the system.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < f4/f8 < 2.0, where f4 is an effective focal length of the fourth lens and f8 is an effective focal length of the eighth lens. More specifically, f4 and f8 can further satisfy 0.97. ltoreq. f4/f 8. ltoreq.1.71. The focal lengths of the fourth lens and the eighth lens are reasonably distributed, the focal power of the rear section of the system is controlled in a small range, and the deflection angle of light can be reduced, so that the sensitivity of the system is reduced. Alternatively, the fourth lens may have a negative power, and the eighth lens may have a negative power.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < R3/R4 < 1.5, where R3 is a radius of curvature of an object-side surface of the second lens and R4 is a radius of curvature of an image-side surface of the second lens. More specifically, R3 and R4 may further satisfy 0.96 ≦ R3/R4 ≦ 1.28. The curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet 0.5 < R3/R4 < 1.5, and the spherical aberration of the system and the generation of astigmatism are reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression f/EPD < 2.5, where f is the effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system. More specifically, f and EPD further satisfy 1.98 ≦ f/EPD ≦ 2.37. The light flux can be increased, so that the optical imaging system has the advantage of a large aperture, and the imaging effect in a dark environment is enhanced while the aberration of the marginal field of view is reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.0 < R7/R8 < 2.5, where R7 is a radius of curvature of an object-side surface of the fourth lens and R8 is a radius of curvature of an image-side surface of the fourth lens. More specifically, R7 and R8 may further satisfy 2.05. ltoreq. R7/R8. ltoreq.2.27. By controlling the bending direction of the fourth lens, the field curvature of the system is effectively controlled, and the image quality of the system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < R10/R9 < 1.5, where R9 is a radius of curvature of an object-side surface of the fifth lens and R10 is a radius of curvature of an image-side surface of the fifth lens. More specifically, R10 and R9 may further satisfy 0.98. ltoreq. R10/R9. ltoreq.1.36. By controlling the bending direction of the fifth lens, the field curvature of the system is effectively controlled, and the image quality of the system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < R2/R1 < 2.0, where R2 is a radius of curvature of an image-side surface of the first lens and R1 is a radius of curvature of an object-side surface of the first lens. More specifically, R2 and R1 may further satisfy 1.19. ltoreq. R2/R1. ltoreq.1.65. By controlling the curvature radius of the object side surface and the image side surface of the first lens, the requirement that R2/R1 is more than 1.0 and less than 2.0 can be met, the optical system can have a larger aperture, and the integral brightness of imaging is improved. Alternatively, the object-side surface of the first lens element can be convex and the image-side surface can be concave.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < R11/R12 < 1.5, where R11 is a radius of curvature of an object-side surface of the sixth lens and R12 is a radius of curvature of an image-side surface of the sixth lens. More specifically, R11 and R12 may further satisfy 0.89. ltoreq. R11/R12. ltoreq.1.37. The curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens meet 0.5 < R11/R12 < 1.5, the chromatic aberration of the system can be corrected, and the balance of all aberrations can be realized. Alternatively, the object-side surface of the sixth lens element can be concave and the image-side surface can be convex.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-2.5 < R15/R16 < -1, where R15 is a radius of curvature of an object-side surface of the eighth lens and R16 is a radius of curvature of an image-side surface of the eighth lens. More specifically, R15 and R16 may further satisfy-2.28. ltoreq. R15/R16. ltoreq. 1.13. By controlling the ratio of the object side surface to the image side surface curvature radius of the eighth lens, the overall aberration of the imaging system can be corrected. Alternatively, the object side surface of the eighth lens element can be concave, and the image side surface can be concave.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 3 < CT1/T12 < 4.5, where CT1 is a center thickness of the first lens on the optical axis and T12 is an air space between the first lens and the second lens on the optical axis. More specifically, CT1 and T12 further satisfy 3.17 ≦ CT1/T12 ≦ 4.42. The reasonable control first lens at the epaxial central thickness of optical axis and first lens and the epaxial air interval of second lens help the lens size distribution even, guarantee the package stability to be favorable to reducing the aberration of whole optical imaging lens, shorten optical imaging lens's overall length.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.5 < CT3/CT5 < 3.0, where CT3 is a central thickness of the third lens on the optical axis and CT5 is a central thickness of the fifth lens on the optical axis. More specifically, CT3 and CT5 further satisfy 2.59 ≦ CT3/CT5 ≦ 2.93. The central thickness CT3 of the third lens and the central thickness CT5 of the fifth lens on the optical axis satisfy 2.5 < CT3/CT5 < 3.0, which is beneficial to the uniform size distribution of the lens, can effectively reduce the size of an optical system, avoid the overlarge volume of the optical imaging lens, and simultaneously reduce the assembly difficulty of the lens and realize higher space utilization rate.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 3.5 < T45/CT4 < 4.5, where T45 is an air space of the fourth lens and the fifth lens on the optical axis, and CT4 is a center thickness of the fourth lens on the optical axis. More specifically, T45 and CT4 further satisfy 3.61 ≦ T45/CT4 ≦ 4.18. The lens size distribution is uniform, the assembly stability is ensured, the aberration of the whole imaging system is reduced, and the total length of the imaging system is shortened.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < f/f3 < 2.0, where f is an overall effective focal length of the optical imaging system, and f3 is an effective focal length of the third lens. More specifically, f and f3 further satisfy 1.3 < f/f3 < 1.7, e.g., 1.41. ltoreq. f/f 3. ltoreq.1.63. By controlling the power of the third lens, tolerance sensitivity is reduced and miniaturization of the imaging system is maintained.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression N3 > 1.7, where N3 is a refractive index of the third lens. More specifically, N3 further can satisfy 1.75. ltoreq. N3. ltoreq.1.76. By controlling the refractive index N3 of the third lens to be more than 1.7, the control of the edge angle of the lens is facilitated, the edge light of the system can be effectively controlled, and the improvement of the image quality of the system is facilitated.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression ImgH > 4.8mm, where ImgH is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system. More specifically, ImgH can further satisfy 4.85mm ≦ ImgH ≦ 5.20 mm. The half of the diagonal length ImgH of the effective pixel area on the imaging surface is more than 4.8mm, which is beneficial to improving the image quality of the system under the condition of a certain image source size.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression V3 ≧ 45.6, where V3 is the Abbe number of the third lens. For example, V3 can satisfy 45.50 ≦ V3 ≦ 45.60. The system chromatic aberration can be effectively controlled by controlling the abbe number of the third lens, and meanwhile, the balance of all aberrations can be realized.
In an exemplary embodiment, the optical imaging system may further include at least one diaphragm. The stop may be disposed at an appropriate position as needed, for example, between the object side and the first lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.
The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, such as the eight lenses described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more favorable for production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging system further has excellent optical properties such as a large image plane, a large visual angle and high resolution.
In the embodiment of the present application, at least one of the mirror surfaces of the respective lenses is an aspherical mirror surface, that is, at least one of the object-side surface and the 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. 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 during imaging can be eliminated as much as possible, thereby improving the imaging quality. 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 optical imaging system may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although eight lenses are exemplified in the embodiment, the optical imaging system is not limited to include eight lenses. The optical imaging system may also include other numbers of lenses, if desired.
Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging system 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 optical imaging system according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging system, in order from an object side to an image side along an optical axis, 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 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 convex 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 concave 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.
Table 1 shows a basic parameter table of the optical imaging system of example 1, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0002056120310000071
TABLE 1
In embodiment 1, the total effective focal length f of the optical imaging system is 4.16mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.80mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 5.15mm, and the half semifov of the maximum field angle is 50.5 °.
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 BDA0002056120310000072
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
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.4943E-02 1.4761E-01 -1.1619E+00 4.9048E+00 -1.2659E+01 2.0242E+01 -1.9546E+01 1.0447E+01 -2.3749E+00
S2 -6.7824E-03 -2.6937E-01 1.7303E+00 -7.6773E+00 2.1909E+01 -3.8920E+01 4.1558E+01 -2.4226E+01 5.8500E+00
S3 -1.1225E-01 -6.7322E-03 -2.6142E-01 1.3685E+00 -4.4649E+00 9.5608E+00 -1.2856E+01 9.7107E+00 -3.1604E+00
S4 -5.8676E-02 -1.6966E-01 7.9734E-01 -3.0026E+00 7.1247E+00 -1.0558E+01 9.4519E+00 -4.6900E+00 9.8681E-01
S5 -2.2299E-02 1.7365E-02 -8.5743E-02 1.3290E-01 7.4888E-02 -5.8302E-01 8.4386E-01 -5.2678E-01 1.2519E-01
S6 -1.8118E-02 6.7292E-02 -2.2416E-01 2.4188E-01 -5.8259E-02 -9.4352E-02 6.9236E-02 -4.4645E-03 -3.9490E-03
S7 -1.7879E-01 4.0774E-01 -9.6596E-01 1.4889E+00 -1.5501E+00 1.0857E+00 -4.8315E-01 1.2226E-01 -1.3413E-02
S8 -1.8354E-01 2.9214E-01 -4.6340E-01 5.0785E-01 -3.7189E-01 1.7750E-01 -4.9619E-02 6.3145E-03 -8.4977E-05
S9 -2.3462E-01 5.2151E-01 -1.1905E+00 2.0374E+00 -2.1238E+00 1.3775E+00 -5.5426E-01 1.2771E-01 -1.2929E-02
S10 -2.2307E-01 4.5036E-01 -7.0724E-01 7.6022E-01 -4.8634E-01 1.8672E-01 -4.3048E-02 5.6168E-03 -3.2982E-04
S11 2.2394E-01 -1.7879E-01 1.7450E-01 -1.9064E-01 1.6209E-01 -8.8560E-02 2.9081E-02 -5.2627E-03 4.0397E-04
S12 1.5104E-01 -2.1992E-01 2.8353E-01 -2.1206E-01 9.9205E-02 -3.0006E-02 5.7605E-03 -6.4699E-04 3.2782E-05
S13 -1.0018E-01 -1.2424E-02 4.3826E-02 -2.5701E-02 8.1114E-03 -1.5976E-03 2.0004E-04 -1.4792E-05 4.9375E-07
S14 2.0637E-03 -3.9340E-02 2.9513E-02 -1.0719E-02 2.2858E-03 -3.0310E-04 2.4765E-05 -1.1489E-06 2.3249E-08
S15 -5.3845E-03 5.2523E-03 -1.7555E-03 2.9635E-04 -2.6996E-05 1.3275E-06 -3.1164E-08 1.6013E-10 3.6984E-12
S16 -2.4149E-02 9.1168E-03 -2.6883E-03 4.7519E-04 -5.4557E-05 4.1244E-06 -1.9561E-07 5.2138E-09 -5.9154E-11
TABLE 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the system. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging system of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 1, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 2A to 2D, the optical imaging system according to embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging system 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 structural diagram of an optical imaging system according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging system, in order from an object side to an image side along an optical axis, 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 convex image-side surface S6. The fourth lens element E4 has negative 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 concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave 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. 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 embodiment 2, the total effective focal length f of the optical imaging system is 4.28mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.87mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 5.15mm, and the half semifov of the maximum field angle is 49.2 °.
Table 3 shows a basic parameter table of the optical imaging system of example 2, in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000081
Figure BDA0002056120310000091
TABLE 3
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.8356E-02 1.1923E-01 -9.8362E-01 3.9730E+00 -9.8005E+00 1.4966E+01 -1.3787E+01 7.0109E+00 -1.5093E+00
S2 -6.0044E-03 -1.5757E-01 1.1431E+00 -5.0220E+00 1.3600E+01 -2.2671E+01 2.2589E+01 -1.2208E+01 2.7076E+00
S3 -1.0194E-01 -2.4478E-02 -1.2806E-02 2.5321E-01 -1.5442E+00 4.4329E+00 -6.8738E+00 5.5168E+00 -1.8169E+00
S4 -9.3747E-02 -6.5520E-02 3.4550E-01 -1.3946E+00 3.3200E+00 -4.8663E+00 4.2837E+00 -2.0842E+00 4.2728E-01
S5 -1.8637E-02 6.8530E-03 -5.2022E-02 1.0758E-01 -1.1761E-02 -3.2157E-01 5.5411E-01 -3.7773E-01 9.4360E-02
S6 -2.1517E-02 1.0701E-01 -4.3324E-01 8.6527E-01 -1.1936E+00 1.1882E+00 -8.0331E-01 3.2304E-01 -5.6367E-02
S7 -1.8014E-01 4.1706E-01 -1.0009E+00 1.5932E+00 -1.7437E+00 1.2994E+00 -6.1931E-01 1.6845E-01 -1.9887E-02
S8 -1.8791E-01 2.9822E-01 -4.7492E-01 5.2741E-01 -3.9732E-01 1.9549E-01 -5.4651E-02 6.1238E-03 1.6063E-04
S9 -2.3179E-01 3.7923E-01 -6.7180E-01 1.1037E+00 -1.1378E+00 7.4906E-01 -3.2165E-01 8.3403E-02 -9.8549E-03
S10 -2.0423E-01 3.5864E-01 -4.8025E-01 4.3436E-01 -1.9908E-01 2.9226E-02 9.2920E-03 -4.0430E-03 4.3040E-04
S11 1.8755E-01 -3.3059E-02 -1.3946E-01 2.0175E-01 -1.3997E-01 5.7196E-02 -1.3812E-02 1.7613E-03 -8.5752E-05
S12 1.3394E-01 -1.2258E-01 1.0545E-01 -3.4120E-02 -9.2751E-03 1.1335E-02 -3.8554E-03 6.0125E-04 -3.6489E-05
S13 -7.6605E-02 -1.9902E-02 5.0229E-02 -3.3279E-02 1.2516E-02 -2.9804E-03 4.4591E-04 -3.8252E-05 1.4298E-06
S14 -6.6128E-03 -1.8769E-02 1.5167E-02 -5.7075E-03 1.2666E-03 -1.7691E-04 1.5413E-05 -7.6942E-07 1.6828E-08
S15 -1.7320E-03 1.4203E-03 -1.4786E-04 -5.3944E-05 1.7262E-05 -2.0495E-06 1.2272E-07 -3.7058E-09 4.5017E-11
S16 -2.4731E-02 5.9788E-03 -1.0352E-03 9.7730E-05 -5.5131E-06 2.3556E-07 -8.7856E-09 2.0912E-10 -1.7636E-12
TABLE 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging system of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 4A to 4D, the optical imaging system according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging system, in order from an object side to an image side along an optical axis, 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 convex image-side surface S6. The fourth lens element E4 has negative 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 concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave 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 embodiment 3, the total effective focal length f of the optical imaging system is 4.31mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.95mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 5.15mm, and the half semifov of the maximum field angle is 48.9 °.
Table 5 shows a basic parameter table of the optical imaging system of example 3, in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000101
TABLE 5
Figure BDA0002056120310000102
Figure BDA0002056120310000111
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging system of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 3, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 6A to 6D, the optical imaging system according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an optical imaging system according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging system, in order from an object side to an image side along an optical axis, 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 convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex 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 concave 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 embodiment 4, the total effective focal length f of the optical imaging system is 3.80mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.71mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 4.95mm, and the half semifov of the maximum field angle is 51.7 °.
Table 7 shows a basic parameter table of the optical imaging system of example 4 in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000112
Figure BDA0002056120310000121
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -5.1905E-02 2.2976E-01 -1.4949E+00 5.2960E+00 -1.1585E+01 1.5686E+01 -1.2782E+01 5.7208E+00 -1.0759E+00
S2 -7.7110E-03 -2.6584E-01 2.2247E+00 -9.2657E+00 2.2466E+01 -3.3094E+01 2.8958E+01 -1.3707E+01 2.6574E+00
S3 -1.3507E-01 1.1040E-01 -4.3696E-01 1.7459E+00 -5.6647E+00 1.1674E+01 -1.4294E+01 9.4816E+00 -2.6306E+00
S4 -9.8855E-02 -8.1438E-02 5.7646E-01 -2.1475E+00 4.5333E+00 -5.7836E+00 4.3774E+00 -1.8008E+00 3.0586E-01
S5 -2.2553E-02 8.8685E-02 -4.8518E-01 1.4363E+00 -2.5995E+00 2.9541E+00 -2.0705E+00 8.2882E-01 -1.4703E-01
S6 1.5466E-02 -5.2121E-02 -1.7803E-05 1.4620E-01 -4.6272E-01 7.6766E-01 -6.9874E-01 3.3075E-01 -6.3370E-02
S7 -1.5117E-01 2.9360E-01 -7.3061E-01 1.2021E+00 -1.3263E+00 9.7548E-01 -4.5394E-01 1.2025E-01 -1.3843E-02
S8 -1.8347E-01 2.9855E-01 -4.9396E-01 5.8217E-01 -4.6478E-01 2.4510E-01 -8.0676E-02 1.4926E-02 -1.1799E-03
S9 -2.5528E-01 6.6043E-01 -1.5420E+00 2.3399E+00 -2.1344E+00 1.2126E+00 -4.2883E-01 8.7407E-02 -7.8887E-03
S10 -2.4370E-01 5.9817E-01 -1.0662E+00 1.2106E+00 -8.1561E-01 3.3273E-01 -8.1818E-02 1.1300E-02 -6.8418E-04
S11 2.4142E-01 -2.6053E-01 3.1201E-01 -3.0028E-01 2.0295E-01 -9.0401E-02 2.5073E-02 -3.9313E-03 2.6681E-04
S12 1.2416E-01 -2.1766E-01 3.2274E-01 -2.7419E-01 1.4387E-01 -4.7505E-02 9.5877E-03 -1.0795E-03 5.1959E-05
S13 -1.4163E-01 5.6751E-02 -1.4090E-02 6.0707E-04 5.4842E-04 -1.1111E-04 -2.3149E-06 2.3682E-06 -1.6140E-07
S14 -1.2251E-02 -6.9276E-03 6.4549E-03 -2.4023E-03 5.0806E-04 -6.6154E-05 5.2743E-06 -2.3793E-07 4.6896E-09
S15 -7.3192E-03 9.7159E-03 -4.1575E-03 9.1834E-04 -1.1646E-04 8.8385E-06 -3.9775E-07 9.8223E-09 -1.0298E-10
S16 -2.0838E-02 1.6709E-03 6.8252E-04 -3.1267E-04 5.3106E-05 -4.6810E-06 2.2579E-07 -5.6135E-09 5.5625E-11
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging system of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 8A to 8D, the optical imaging system according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an optical imaging system according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging system, in order from an object side to an image side along an optical axis, 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 convex image-side surface S6. The fourth lens element E4 has negative 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 concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave 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 embodiment 5, the total effective focal length f of the optical imaging system is 4.18mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.75mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 5.20mm, and the half semifov of the maximum field angle is 50.0 °.
Table 9 shows a basic parameter table of the optical imaging system of example 5 in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000131
TABLE 9
Figure BDA0002056120310000132
Figure BDA0002056120310000141
Watch 10
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 5. Fig. 10C shows a distortion curve of the optical imaging system of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 5, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 10A to 10D, the optical imaging system according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging system 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 an optical imaging system according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging system, in order from an object side to an image side along an optical axis, 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 convex image-side surface S6. The fourth lens element E4 has negative 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 concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave 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 embodiment 6, the total effective focal length f of the optical imaging system is 4.11mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.72mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 4.85mm, and the half semifov of the maximum field angle is 49.1 °.
Table 11 shows a basic parameter table of the optical imaging system of example 6 in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000142
Figure BDA0002056120310000151
TABLE 11
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.7209E-02 1.4621E-01 -1.2269E+00 5.1442E+00 -1.3082E+01 2.0547E+01 -1.9469E+01 1.0198E+01 -2.2670E+00
S2 -4.1682E-03 -1.8248E-01 1.1961E+00 -4.8578E+00 1.2593E+01 -2.0407E+01 1.9847E+01 -1.0404E+01 2.1870E+00
S3 -9.7839E-02 -7.5087E-02 2.1216E-01 -4.5276E-01 1.2214E-01 1.8296E+00 -4.4648E+00 4.3940E+00 -1.6469E+00
S4 -8.8119E-02 -1.0126E-01 4.7611E-01 -1.7509E+00 4.0662E+00 -5.9693E+00 5.3220E+00 -2.6351E+00 5.5180E-01
S5 -1.4830E-02 -2.4734E-02 1.2255E-01 -5.2452E-01 1.4046E+00 -2.2676E+00 2.1374E+00 -1.0727E+00 2.2025E-01
S6 -1.3512E-02 6.6727E-02 -3.7535E-01 1.0005E+00 -1.8562E+00 2.3306E+00 -1.8345E+00 8.0861E-01 -1.5050E-01
S7 -1.7284E-01 3.6949E-01 -8.9546E-01 1.5032E+00 -1.7694E+00 1.4253E+00 -7.3529E-01 2.1746E-01 -2.8134E-02
S8 -1.8758E-01 2.9999E-01 -5.0706E-01 6.3837E-01 -5.8277E-01 3.7406E-01 -1.5713E-01 3.8820E-02 -4.3013E-03
S9 -2.1552E-01 4.0499E-01 -8.2555E-01 1.3763E+00 -1.4114E+00 9.0533E-01 -3.6430E-01 8.4993E-02 -8.7948E-03
S10 -2.1527E-01 4.0177E-01 -5.9493E-01 6.1635E-01 -3.6977E-01 1.2577E-01 -2.3146E-02 1.9280E-03 -3.4005E-05
S11 2.0890E-01 -8.2892E-02 -5.3598E-02 1.0554E-01 -7.2297E-02 2.7896E-02 -6.4120E-03 7.8941E-04 -3.6689E-05
S12 1.2689E-01 -1.3047E-01 1.4727E-01 -9.6023E-02 3.7098E-02 -8.2757E-03 8.8732E-04 -1.0455E-05 -3.8719E-06
S13 -1.0446E-01 -7.2432E-04 3.3702E-02 -2.1661E-02 7.2972E-03 -1.5292E-03 2.0283E-04 -1.5744E-05 5.4485E-07
S14 3.1913E-03 -3.6408E-02 2.6909E-02 -9.8323E-03 2.1307E-03 -2.8900E-04 2.4275E-05 -1.1623E-06 2.4354E-08
S15 1.7995E-03 4.3972E-05 1.4504E-04 -1.1032E-04 2.7216E-05 -3.2566E-06 2.0808E-07 -6.8544E-09 9.1829E-11
S16 -2.7215E-02 8.6419E-03 -2.0982E-03 3.1218E-04 -3.1518E-05 2.2641E-06 -1.0978E-07 3.1293E-09 -3.8778E-11
TABLE 12
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging system of example 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 6. Fig. 12C shows a distortion curve of the optical imaging system of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging system of example 6, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 12A to 12D, the optical imaging system according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging system 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 optical imaging system according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging system, in order from an object side to an image side along an optical axis, 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 concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative 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 concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave 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 embodiment 7, the total effective focal length f of the optical imaging system is 4.12mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.73mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 4.95mm, and the half semifov of the maximum field angle is 49.5 °.
Table 13 shows a basic parameter table of the optical imaging system of example 7 in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000161
Watch 13
Figure BDA0002056120310000162
TABLE 14
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of example 7, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging system of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging system of example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 14A to 14D, the optical imaging system according to embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging system 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 an optical imaging system according to embodiment 8 of the present application.
As shown in fig. 15, the optical imaging system, in order from an object side to an image side along an optical axis, 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 convex image-side surface S6. The fourth lens element E4 has negative 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 concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave 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 embodiment 8, the total effective focal length f of the optical imaging system is 4.45mm, the on-axis distance TTL of the object side surface of the first lens to the imaging plane is 5.95mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane is 5.20mm, and the half semifov of the maximum field angle is 48.9 °.
Table 15 shows a basic parameter table of the optical imaging system of example 8 in which the units of the radius of curvature, the thickness, and the 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 BDA0002056120310000172
Figure BDA0002056120310000181
Watch 15
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.0207E-02 8.1306E-02 -6.5656E-01 2.4874E+00 -5.7308E+00 8.1432E+00 -6.9564E+00 3.2645E+00 -6.4423E-01
S2 -1.2760E-02 -1.1212E-01 8.9448E-01 -3.6884E+00 9.3545E+00 -1.4710E+01 1.3945E+01 -7.2474E+00 1.5716E+00
S3 -9.4669E-02 -4.1940E-02 2.6664E-01 -1.0038E+00 2.1811E+00 -2.8150E+00 1.9565E+00 -5.4892E-01 -2.0229E-02
S4 -8.4341E-02 -4.9298E-02 2.2112E-01 -7.6858E-01 1.6466E+00 -2.2467E+00 1.8746E+00 -8.7293E-01 1.7234E-01
S5 -1.3895E-02 -6.1617E-03 1.9020E-03 -4.1542E-02 2.0358E-01 -4.3079E-01 4.6833E-01 -2.5428E-01 5.4899E-02
S6 -1.5148E-02 7.2952E-02 -2.7908E-01 4.5299E-01 -4.3540E-01 2.5544E-01 -8.8224E-02 1.5794E-02 -5.0033E-04
S7 -1.4767E-01 2.9477E-01 -6.4556E-01 9.2964E-01 -8.9513E-01 5.7216E-01 -2.3062E-01 5.2650E-02 -5.1667E-03
S8 -1.5770E-01 2.1884E-01 -3.0871E-01 3.0092E-01 -1.8847E-01 6.8170E-02 -8.8645E-03 -2.0036E-03 6.1397E-04
S9 -1.9667E-01 3.1899E-01 -5.1514E-01 7.5622E-01 -7.0996E-01 4.2444E-01 -1.6171E-01 3.6102E-02 -3.5873E-03
S10 -1.8021E-01 2.7909E-01 -3.3435E-01 2.7909E-01 -1.2310E-01 2.2010E-02 1.7212E-03 -1.1900E-03 1.2144E-04
S11 1.8694E-01 -8.2233E-02 -9.7872E-03 3.4875E-02 -1.7999E-02 3.6591E-03 5.2771E-05 -1.4522E-04 1.7368E-05
S12 9.6834E-02 -1.1606E-01 1.6179E-01 -1.2234E-01 5.5106E-02 -1.5343E-02 2.5823E-03 -2.4121E-04 9.6590E-06
S13 -8.7433E-02 -3.4018E-02 7.8462E-02 -5.2117E-02 1.9203E-02 -4.4003E-03 6.3383E-04 -5.3544E-05 2.0510E-06
S14 -2.3463E-03 -2.7372E-02 2.1829E-02 -8.4853E-03 1.9466E-03 -2.7841E-04 2.4568E-05 -1.2329E-06 2.7081E-08
S15 4.6199E-03 -1.9320E-04 -3.3129E-04 8.3054E-05 -8.3995E-06 4.0776E-07 -7.9402E-09 -3.4202E-11 2.3505E-12
S16 -2.9440E-02 1.2585E-02 -3.6343E-03 6.4352E-04 -7.2739E-05 5.2572E-06 -2.3412E-07 5.8336E-09 -6.2106E-11
TABLE 16
Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 8, which represents the convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 8. Fig. 16C shows a distortion curve of the optical imaging system of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve of the optical imaging system of example 8, which represents the deviation of different image heights on the imaging plane after the light passes through the system. As can be seen from fig. 16A to 16D, the optical imaging system according to embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 9 each satisfy the relationship shown in table 19.
Figure BDA0002056120310000182
Figure BDA0002056120310000191
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 optical imaging system described above.
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 (38)

1. The optical imaging system comprises, in order from an object side to an image side along an optical axis: 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 having optical power,
the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the third lens and the sixth lens each have a positive optical power,
the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy 0.5 < R11/R12 < 1.5.
2. The optical imaging system of claim 1, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging system on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging system satisfy 1.0 < TTL/ImgH < 1.5.
3. The optical imaging system of claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy 1.0 < | f2|/f1 < 2.5.
4. The optical imaging system of claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f8 of the eighth lens satisfy 0.5 < f4/f8 < 2.0.
5. The optical imaging system of claim 1, wherein a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R4 of an image-side surface of the second lens satisfy 0.5 < R3/R4 < 1.5.
6. The optical imaging system of claim 1, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy 2.0 < R7/R8 < 2.5.
7. The optical imaging system of claim 1, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy 0.5 < R10/R9 < 1.5.
8. The optical imaging system of claim 1, wherein a radius of curvature R2 of an image-side surface of the first lens and a radius of curvature R1 of an object-side surface of the first lens satisfy 1.0 < R2/R1 < 2.0.
9. The optical imaging system of claim 1, wherein a Semi-FOV of a maximum field angle of the optical imaging system satisfies a Semi-FOV ≧ 48 °.
10. The optical imaging system of claim 1, wherein the eighth lens has a negative optical power.
11. The optical imaging system of claim 1, wherein a radius of curvature R15 of an object-side surface of the eighth lens and a radius of curvature R16 of an image-side surface of the eighth lens satisfy-2.5 < R15/R16 < -1.
12. The optical imaging system of claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy 3 < CT1/T12 < 4.5.
13. The optical imaging system of claim 1, wherein a central thickness CT3 of the third lens on the optical axis and a central thickness CT5 of the fifth lens on the optical axis satisfy 2.5 < CT3/CT5 < 3.0.
14. The optical imaging system of claim 1, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy 3.5 < T45/CT4 < 4.5.
15. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens satisfy 1.0 < f/f3 < 2.0.
16. The optical imaging system of claim 1, wherein the refractive index N3 of the third lens satisfies N3 > 1.7.
17. The optical imaging system of claim 1, wherein the third lens has an Abbe number V3 satisfying V3 ≧ 45.6.
18. The optical imaging system of any one of claims 1 to 17, wherein a total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy f/EPD < 2.5.
19. The optical imaging system according to any one of claims 1 to 17, wherein ImgH, which is half the diagonal length of an effective pixel area on an imaging plane of the optical imaging system, satisfies ImgH > 4.8 mm.
20. The optical imaging system comprises, in order from an object side to an image side along an optical axis: 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 having optical power,
the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the third lens and the sixth lens both have positive focal power,
the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system meet the condition that TTL/ImgH is more than 1.0 and less than 1.5.
21. The optical imaging system of claim 20, wherein the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy 1.0 < | f2|/f1 < 2.5.
22. The optical imaging system of claim 20, wherein an effective focal length f4 of the fourth lens and an effective focal length f8 of the eighth lens satisfy 0.5 < f4/f8 < 2.0.
23. The optical imaging system of claim 20, wherein a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy 0.5 < R3/R4 < 1.5.
24. The optical imaging system of claim 20, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy 2.0 < R7/R8 < 2.5.
25. The optical imaging system of claim 20, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R10 of an image-side surface of the fifth lens satisfy 0.5 < R10/R9 < 1.5.
26. The optical imaging system of claim 20, wherein a radius of curvature R2 of the image-side surface of the first lens and a radius of curvature R1 of the object-side surface of the first lens satisfy 1.0 < R2/R1 < 2.0.
27. The optical imaging system of claim 26, wherein a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R12 of an image-side surface of the sixth lens satisfy 0.5 < R11/R12 < 1.5.
28. The optical imaging system of claim 20, wherein the eighth lens has a negative optical power.
29. The optical imaging system of claim 28, wherein a radius of curvature R15 of an object-side surface of the eighth lens and a radius of curvature R16 of an image-side surface of the eighth lens satisfy-2.5 < R15/R16 < -1.
30. The optical imaging system of claim 20, wherein a center thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy 3 < CT1/T12 < 4.5.
31. The optical imaging system of claim 20, wherein a central thickness CT3 of the third lens on the optical axis and a central thickness CT5 of the fifth lens on the optical axis satisfy 2.5 < CT3/CT5 < 3.0.
32. The optical imaging system of claim 20, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy 3.5 < T45/CT4 < 4.5.
33. The optical imaging system of claim 20, wherein the total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens satisfy 1.0 < f/f3 < 2.0.
34. The optical imaging system of claim 20, wherein the refractive index N3 of the third lens satisfies N3 > 1.7.
35. The optical imaging system of claim 20, wherein the third lens has an abbe number V3 satisfying V3 ≧ 45.6.
36. The optical imaging system according to any of claims 20 to 35, wherein a half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies Semi-FOV ≧ 48 °.
37. The optical imaging system of any of claims 20 to 35, wherein a total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy f/EPD < 2.5.
38. The optical imaging system according to any one of claims 20 to 35, wherein ImgH of half of a diagonal length of an effective pixel area on an imaging plane of the optical imaging system satisfies ImgH > 4.8 mm.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110068915A (en) * 2019-05-10 2019-07-30 浙江舜宇光学有限公司 Optical imaging system
JP6894569B1 (en) * 2020-09-29 2021-06-30 ジョウシュウシ レイテック オプトロニクス カンパニーリミテッド Imaging optical lens
CN114545594A (en) * 2021-12-31 2022-05-27 江西晶超光学有限公司 Optical system, camera module and electronic equipment
WO2024020893A1 (en) * 2022-07-27 2024-02-01 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Imaging lens assembly, camera module, and imaging device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110068915A (en) * 2019-05-10 2019-07-30 浙江舜宇光学有限公司 Optical imaging system
JP6894569B1 (en) * 2020-09-29 2021-06-30 ジョウシュウシ レイテック オプトロニクス カンパニーリミテッド Imaging optical lens
CN114545594A (en) * 2021-12-31 2022-05-27 江西晶超光学有限公司 Optical system, camera module and electronic equipment
CN114545594B (en) * 2021-12-31 2023-07-04 江西晶超光学有限公司 Optical system, camera module and electronic equipment
WO2024020893A1 (en) * 2022-07-27 2024-02-01 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Imaging lens assembly, camera module, and imaging device

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