CN108983399B - Optical imaging lens group - Google Patents

Optical imaging lens group Download PDF

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Publication number
CN108983399B
CN108983399B CN201811167277.8A CN201811167277A CN108983399B CN 108983399 B CN108983399 B CN 108983399B CN 201811167277 A CN201811167277 A CN 201811167277A CN 108983399 B CN108983399 B CN 108983399B
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lens
optical imaging
optical
imaging lens
image
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CN108983399A (en
Inventor
李龙
吕赛锋
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201811167277.8A priority Critical patent/CN108983399B/en
Priority to CN202310894777.6A priority patent/CN116679423A/en
Publication of CN108983399A publication Critical patent/CN108983399A/en
Priority to PCT/CN2019/095359 priority patent/WO2020073702A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

The application discloses an optical imaging lens group, which sequentially comprises the following components 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. The first lens has optical power; the second lens has positive optical power; the third lens has optical power, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power; the fifth lens has optical power; the sixth lens element has optical power, wherein an object-side surface of the sixth lens element is concave, and an image-side surface of the sixth lens element is convex; the seventh lens has positive optical power; and the eighth lens has optical power.

Description

Optical imaging lens group
Technical Field
The present application relates to an optical imaging lens group, and more particularly, to an optical imaging lens group including eight lenses.
Background
In recent years, with the increase of requirements on software and hardware of a mobile phone, an increasing requirement on imaging quality of an imaging lens mounted on the mobile phone is raised. Besides the basic parameters of high pixel, high resolution and the like, the mobile phone lens is increasingly required to have the characteristics of ultra-thin, large aperture and wide field angle. Thus, the targeted development of these features is a major concern for current mobile phone lens designs.
Theoretically, adding multiple lenses allows the system more space and freedom to find the optimal solution, which is one of the most efficient ways to improve the imaging quality of an optical system. However, in contradiction to this, the increase in the number of lenses extremely causes an increase in the size of the system, which is contrary to the current trend of the ultra-thin lens of the mobile phone. Therefore, how to improve the imaging quality of the lens while maintaining the ultra-thin lens is a matter to be solved in the research of the art.
Disclosure of Invention
The present application provides an optical imaging lens set applicable to portable electronic products that at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an optical imaging lens group comprising, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive focal power or negative focal power, and the image side surface of the third lens can be a convex surface; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power.
In one embodiment, the object side surface of the second lens may be convex.
In one embodiment, the image side of the fourth lens may be concave.
In one embodiment, the object side surface of the seventh lens may be convex.
In one embodiment, the effective focal length f2 of the second lens and the effective focal length f7 of the seventh lens may satisfy 0 < f2/f7 < 0.8.
In one embodiment, the total effective focal length f of the optical imaging lens group and the effective focal length f4 of the fourth lens may satisfy-0.8 < f/f4 < 0.
In one embodiment, the center thickness CT7 of the seventh lens element on the optical axis and the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens assembly on the optical axis may satisfy 1.5 < CT7/ttl×10 < 2.5.
In one embodiment, the maximum effective radius DT61 of the object-side surface of the sixth lens and the maximum effective radius DT71 of the object-side surface of the seventh lens may satisfy 0.2 < DT61/DT71 < 0.7.
In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the effective focal length f1 of the first lens may satisfy 0 < (r1+r2)/|f1| < 0.5.
In one embodiment, the radius of curvature R6 of the image side of the third lens and the effective focal length f3 of the third lens may satisfy 0 < |R6/f3| < 0.8.
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 may satisfy-0.8 < R15/R16 < -0.3.
In one embodiment, the radius of curvature R12 of the image side of the sixth lens and the radius of curvature R11 of the object side of the sixth lens may satisfy 0.3 < R12/R11 < 1.3.
In one embodiment, the total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group may satisfy f/EPD < 2.0.
In one embodiment, the maximum half field angle HFOV of the optical imaging lens set may satisfy 40 < HFOV < 50.
In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens group on the optical axis and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group can satisfy TTL/ImgH < 1.4.
In one embodiment, the combined focal length f123456 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens and the total effective focal length f of the optical imaging lens group may satisfy 1.0 < f123456/f < 1.5.
In one embodiment, the separation distance T67 of the sixth lens and the seventh lens on the optical axis and the separation distance T78 of the seventh lens and the eighth lens on the optical axis may satisfy 0.4 < T67/T78 < 1.0.
In another aspect, the present application also provides an optical imaging lens group, including, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power. The distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group can meet the requirement that TTL/ImgH is less than 1.4.
In yet another aspect, the present application also provides an optical imaging lens group including, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power. Wherein the maximum half field angle HFOV of the set of optical imaging lenses may satisfy 40 DEG < HFOV < 50 deg.
In yet another aspect, the present application also provides an optical imaging lens group including, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power. The radius of curvature R15 of the object-side surface of the eighth lens element and the radius of curvature R16 of the image-side surface of the eighth lens element may satisfy-0.8 < R15/R16 < -0.3.
In yet another aspect, the present application also provides an optical imaging lens group including, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power. The maximum effective radius DT61 of the object side of the sixth lens and the maximum effective radius DT71 of the object side of the seventh lens may satisfy 0.2 < DT61/DT71 < 0.7.
In yet another aspect, the present application also provides an optical imaging lens group including, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power. The center thickness CT7 of the seventh lens element on the optical axis and the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens assembly on the optical axis may satisfy 1.5 < CT7/ttl×10 < 2.5.
In yet another aspect, the present application also provides an optical imaging lens group including, 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. The first lens has positive optical power or negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; and the eighth lens has positive optical power or negative optical power. The distance T67 between the sixth lens and the seventh lens on the optical axis and the distance T78 between the seventh lens and the eighth lens on the optical axis can satisfy 0.4 < T67/T78 < 1.0.
The application adopts eight lenses, and the optical imaging lens group has at least one beneficial effects of ultra-thin, large light flux, wide imaging range, miniaturization and the like by reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing among the lenses and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic view showing the structure of an optical imaging 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 optical imaging lens group of embodiment 1;
FIG. 3 is a schematic view showing the structure of an optical imaging 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 optical imaging lens group of embodiment 2;
FIG. 5 is a schematic view showing the structure of an optical imaging lens group according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of example 3;
FIG. 7 is a schematic view showing the structure of an optical imaging 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 magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 4;
FIG. 9 is a schematic view showing the structure of an optical imaging lens group according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of example 5;
FIG. 11 is a schematic view showing the structure of an optical imaging lens group according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of example 6;
FIG. 13 is a schematic view showing the structure of an optical imaging lens group according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of example 7;
FIG. 15 is a schematic view showing the structure of an optical imaging lens group according to embodiment 8 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of example 8;
FIG. 17 is a schematic view showing the structure of an optical imaging lens group according to embodiment 9 of the present application;
fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of example 9;
FIG. 19 is a schematic view showing the structure of an optical imaging lens group according to embodiment 10 of the present application;
fig. 20A to 20D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 10.
Detailed Description
For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical imaging lens group according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, 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 sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens has positive or negative optical power; the second lens may have positive optical power; the third lens has positive focal power or negative focal power, and the image side surface of the third lens can be a convex surface; the fourth lens may have negative optical power; the fifth lens has positive optical power or negative optical power; the sixth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the seventh lens may have positive optical power; the eighth lens has positive optical power or negative optical power. By setting the second lens as positive focal power, the aberration correcting capability of the lens group can be effectively improved, the sensitivity of the system can be reduced, and the negative focal power of the fourth lens and the positive focal power of the seventh lens are further matched, so that the focal power distribution of the whole lens group is facilitated, the excessive concentration of the focal power is avoided, and meanwhile, the chromatic aberration of the vertical axis and the lateral chromatic aberration of the lens group are balanced. The image side surface of the third lens is designed to be convex, so that the spherical aberration of the system can be reduced and the aberration correcting capability of the system can be improved by effectively matching the first lens with the second lens. And the sixth lens is designed into a concave-convex structure, so that the imaging range of the system can be enlarged, the image height is increased, and the high image height of the system is realized.
In an exemplary embodiment, the object-side surface of the first lens may be convex and the image-side surface may be concave.
In an exemplary embodiment, the object side surface of the second lens may be convex. By designing the object side surface of the second lens to be a convex surface, the second lens can bear positive focal power, aberration of the whole system can be effectively reduced, sensitivity of the system is reduced, yield of the system is improved, and meanwhile processing and assembling of a subsequent structure are facilitated.
In an exemplary embodiment, the image side of the fourth lens may be concave. The image side surface of the fourth lens is designed to be concave, so that the fourth lens is provided with the focal power, and the aberration correcting capability of the system is improved.
In an exemplary embodiment, the seventh lens object side may be convex. The object side surface of the seventh lens is designed to be convex, so that the seventh lens can bear a certain degree of positive focal power and can share part of the focal power of the system to avoid excessive concentration of the focal power.
In an exemplary embodiment, the eighth lens may have negative optical power, and both the object-side surface and the image-side surface thereof may be concave.
In an exemplary embodiment, the optical imaging lens set of the present application may satisfy the condition f/EPD < 2.0, where f is the total effective focal length of the optical imaging lens set and EPD is the entrance pupil diameter of the optical imaging lens set. More specifically, f and EPD may further satisfy 1.6 < f/EPD < 2.0, e.g., 1.70.ltoreq.f/EPD.ltoreq.1.98. The f/EPD is controlled to be less than 2.0, the light flux in unit time of the lens can be effectively increased, the lens has higher relative illuminance, the imaging quality of the lens in a darker environment can be better improved, and the lens has higher practicability.
In an exemplary embodiment, the optical imaging lens set of the present application may satisfy the conditional expression 40 ° < HFOV < 50 °, wherein HFOV is the maximum half field angle of the optical imaging lens set. More specifically, HFOV's further may satisfy 43 < HFOV < 48, such as 45.2 < HFOV < 47.1. The imaging image height of the system can be improved by adjusting the system field angle, meanwhile, the overlarge aberration of the edge field of view can be avoided, and the characteristics of wide imaging range and high imaging quality of the system can be better realized.
In an exemplary embodiment, the optical imaging lens set of the present application may satisfy the condition 0 < f2/f7 < 0.8, where f2 is an effective focal length of the second lens and f7 is an effective focal length of the seventh lens. More specifically, f2 and f7 may further satisfy 0.25.ltoreq.f2/f7.ltoreq.0.59. The first effect is to enable the focal power of the lens group to be distributed more reasonably by reasonably adjusting the effective focal lengths of the second lens and the seventh lens, so that the focal power is not concentrated excessively on the seventh lens, thereby being beneficial to improving the imaging quality of the system and reducing the sensitivity of the system; the second effect is to effectively maintain the ultra-thin nature of the lens set.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression-0.8 < f/f4 < 0, where f is the total effective focal length of the optical imaging lens group and f4 is the effective focal length of the fourth lens. More specifically, f and f4 may further satisfy-0.64.ltoreq.f4.ltoreq.0.19. By reasonably controlling the ratio of the total effective focal length of the lens group to the effective focal length of the fourth lens, the spherical aberration contribution of the fourth lens can be controlled within a reasonable range, so that the on-axis view field area of the optical system has better imaging quality.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that 0 < (r1+r2)/|f1| < 0.5, where R1 is a radius of curvature of an object side surface of the first lens, R2 is a radius of curvature of an image side surface of the first lens, and f1 is an effective focal length of the first lens. More specifically, R1, R2 and f1 may further satisfy 0 < (R1+R2)/|f1| < 0.1, for example, 0.03.ltoreq.R1+R2)/|f1|.ltoreq.0.08. The curvature radius and the effective focal length of the object side surface and the image side surface of the first lens are reasonably controlled, the system size can be effectively reduced, the system focal power can be reasonably distributed to avoid excessive concentration on the first lens, meanwhile, the aberration of the rear end lens can be corrected, and the first lens can maintain good process processability.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition 0 < |r6/f3| < 0.8, where R6 is a radius of curvature of an image side surface of the third lens and f3 is an effective focal length of the third lens. More specifically, R6 and f3 may further satisfy 0.17.ltoreq.R6/f3.ltoreq.0.61. By reasonably controlling the curvature radius of the image side surface and the effective focal length of the third lens, the astigmatic and coma contribution of the third lens can be controlled within a reasonable range, and the astigmatic and coma remained by the front lens can be effectively balanced, so that the lens group has better imaging quality.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that TTL/ImgH < 1.4, where TTL is a distance between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on an optical axis, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens group. More specifically, TTL and ImgH can further satisfy 1.0 < TTL/ImgH < 1.4, e.g., 1.27. Ltoreq.TTL/ImgH. Ltoreq.1.35. The total size of the lens group can be effectively reduced by meeting the condition that TTL/ImgH is smaller than 1.4, and the ultrathin characteristic and miniaturization of the lens group are realized, so that the lens group can be better suitable for ultrathin portable electronic products.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.3 < R12/R11 < 1.3, wherein R12 is a radius of curvature of an image side surface of the sixth lens element, and R11 is a radius of curvature of an object side surface of the sixth lens element. More specifically, R12 and R11 may further satisfy 0.54.ltoreq.R12/R11.ltoreq.1.14. By reasonably distributing the curvature radius of the object side surface and the image side surface of the sixth lens, astigmatism and coma between the sixth lens and the front end lens can be effectively balanced, and the lens can have better imaging quality.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition-0.8 < R15/R16 < -0.3, wherein R15 is a radius of curvature of an object side of the eighth lens element and R16 is a radius of curvature of an image side of the eighth lens element. More specifically, R15 and R16 may further satisfy-0.71.ltoreq.R15/R16.ltoreq.0.41. By reasonably distributing the curvature radiuses of the object side surface and the image side surface of the eighth lens, astigmatism and coma between the eighth lens and the front end lens can be effectively balanced, and the object side convex surface of the seventh lens can be matched to enable the lens to keep better imaging quality, and meanwhile, the image height of the lens group on the imaging surface can be increased.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.2 < DT61/DT71 < 0.7, wherein DT61 is the maximum effective radius of the object side of the sixth lens element and DT71 is the maximum effective radius of the object side of the seventh lens element. More specifically, DT61 and DT71 may further satisfy 0.35. Ltoreq.DT 61/DT 71. Ltoreq.0.65, e.g., 0.50. Ltoreq.DT 61/DT 71. Ltoreq.0.64. By reasonably controlling the effective radius of the object side surface of the sixth lens and the effective radius of the object side surface of the seventh lens, the light passing amount of the lens group can be effectively increased, and the relative illumination of the view field at the edge of the system can be increased, so that the system can still have good imaging quality in a dark-light environment.
In an exemplary embodiment, the optical imaging lens assembly of the present application may satisfy the condition of 1.5 < CT 7/ttlx 10 < 2.5, where CT7 is a central thickness of the seventh lens element on the optical axis, and TTL is a distance between an object side surface of the first lens element and an imaging surface of the optical imaging lens assembly on the optical axis. More specifically, CT7 and TTL may further satisfy 1.74.ltoreq.CT 7/TTL.times.10.ltoreq.2.27. The thickness of the center of the seventh lens on the optical axis is reasonably controlled, which is beneficial to the miniaturization of the system and can reduce the risk of generating ghost images; meanwhile, the system chromatic aberration can be effectively reduced by matching the fifth lens and the sixth lens, and meanwhile, the system performance degradation caused by the over-thin seventh lens can be avoided.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition of 1.0 < f123456/f < 1.5, wherein f123456 is a combined focal length of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and f is a total effective focal length of the optical imaging lens group. More specifically, f123456 and f may further satisfy 1.03.ltoreq.f123456/f.ltoreq.1.20. By reasonably adjusting the ratio of the combined focal length of the first lens to the sixth lens to the total focal length of the optical system, the focal power of the system is distributed more on the first lens to the sixth lens, the aberration correcting capability of the system can be better improved, and meanwhile, the size of the lens group can be effectively reduced, so that the ultra-thin characteristic can be kept.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.4 < T67/T78 < 1.0, where T67 is a separation distance of the sixth lens and the seventh lens on the optical axis, and T78 is a separation distance of the seventh lens and the eighth lens on the optical axis. More specifically, T67 and T78 may further satisfy 0.47.ltoreq.T67/T78.ltoreq.0.91. By reasonably controlling the spacing distance between the sixth lens and the seventh lens and the spacing distance between the seventh lens and the eighth lens, the risk of ghost images generated by the system can be effectively reduced, and the size of the lens group can be reduced.
In an exemplary embodiment, the optical imaging lens set may further include at least one diaphragm to enhance the imaging quality of the optical imaging lens set. Alternatively, a diaphragm may be provided between the object side and the first lens.
Optionally, the optical imaging lens set may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The optical imaging lens group according to the above 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 center thickness of each lens, the axial spacing between each lens and the like, the volume of the optical imaging lens group can be effectively reduced, the sensitivity of the optical imaging lens group can be reduced, and the processability of the optical imaging lens group can be improved, so that the optical imaging lens group is more beneficial to production and processing and is applicable to portable electronic products. The optical imaging lens group configured in the above way can also have the beneficial effects of ultra-thin, large aperture, large angle of view, high imaging quality and the like.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., 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 surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Alternatively, each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may be aspherical in object side and image side.
However, those skilled in the art will appreciate that the number of lenses making up an optical imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although eight lenses are described as an example in the embodiment, the optical imaging lens group is not limited to include eight lenses. The optical imaging lens group may also include other numbers of lenses, if desired.
Specific examples of optical imaging lens sets applicable to the above embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration of an optical imaging lens group according to embodiment 1 of the present application.
As shown in fig. 1, an optical imaging lens group according to an exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. 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 the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 1, wherein the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S16 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -5.4500E-02 -4.6660E-02 1.2747E-01 -4.3541E-01 8.4064E-01 -9.9804E-01 7.2113E-01 -2.9114E-01 5.0495E-02
S2 -6.7070E-02 -5.4610E-02 1.4375E-01 -4.6224E-01 8.3661E-01 -9.1248E-01 5.8514E-01 -2.0156E-01 2.8596E-02
S3 -1.0860E-02 9.4760E-03 -4.9330E-02 2.2994E-01 -5.8281E-01 8.6445E-01 -7.4452E-01 3.4291E-01 -6.4960E-02
S4 -1.5280E-02 -4.6100E-03 -1.6390E-02 1.7322E-01 -4.7988E-01 7.2006E-01 -6.1594E-01 2.8557E-01 -5.5680E-02
S5 -1.9710E-02 1.5441E-02 1.0452E-02 3.7620E-02 -1.7848E-01 3.5657E-01 -3.7767E-01 2.1131E-01 -4.8910E-02
S6 1.8448E-02 9.8160E-03 9.3870E-03 1.6320E-02 -5.6520E-02 1.1044E-01 -1.3036E-01 8.5067E-02 -2.2880E-02
S7 5.8308E-02 -2.8720E-02 -1.9230E-02 1.0309E-01 -2.0714E-01 2.5153E-01 -1.8914E-01 8.0124E-02 -1.4370E-02
S8 3.3071E-02 -1.9040E-02 2.1725E-02 -4.7870E-02 8.4561E-02 -9.1390E-02 5.7625E-02 -1.9410E-02 2.7050E-03
S9 -5.9090E-02 4.3262E-02 -1.7856E-01 5.1289E-01 -8.6894E-01 9.0597E-01 -5.6671E-01 1.9633E-01 -2.9220E-02
S10 -5.7230E-02 3.1872E-02 -2.1874E-01 5.7316E-01 -8.6593E-01 7.8573E-01 -4.2650E-01 1.2878E-01 -1.6770E-02
S11 5.6190E-02 -1.3510E-02 -6.9890E-02 2.0031E-01 -2.4822E-01 1.5315E-01 -4.2910E-02 1.6960E-03 1.0250E-03
S12 3.6697E-02 -8.9500E-03 2.2000E-02 1.8420E-03 -2.3500E-02 2.3536E-02 -1.1780E-02 3.1050E-03 -3.4000E-04
S13 -3.1420E-02 9.9980E-03 -5.1900E-03 1.9100E-03 -5.8000E-04 1.3700E-04 -2.2000E-05 1.9500E-06 -7.7000E-08
S14 -1.6300E-03 2.2580E-03 -1.4000E-03 3.2500E-04 -4.2000E-05 3.0600E-06 -1.2000E-07 1.8200E-09 1.8700E-12
S15 2.1280E-03 3.3090E-03 -1.0300E-03 3.3100E-04 -7.4000E-05 9.7500E-06 -7.3000E-07 2.8700E-08 -4.6000E-10
S16 -9.9800E-03 -4.1000E-04 3.8300E-04 -8.7000E-05 1.0600E-05 -7.0000E-07 1.9500E-08 9.6000E-11 -1.1000E-11
TABLE 2
Table 3 gives the effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in embodiment 1, the total effective focal length f of the optical imaging lens group, the total optical length TTL (i.e., the distance on the optical axis from the object side surface S1 to the imaging surface S19 of the first lens E1), half the diagonal length ImgH of the effective pixel area on the imaging surface S19, and the maximum half field angle HFOV.
f1(mm) -49.32 f7(mm) 10.36
f2(mm) 4.07 f8(mm) -3.62
f3(mm) 10.87 f(mm) 4.25
f4(mm) -6.77 TTL(mm) 5.76
f5(mm) 17.29 ImgH(mm) 4.28
f6(mm) -98.16 HFOV(°) 45.2
TABLE 3 Table 3
The optical imaging lens group in example 1 satisfies:
f/EPD = 1.98, where f is the total effective focal length of the optical imaging lens group and EPD is the entrance pupil diameter of the optical imaging lens group;
f2/f7=0.39, where f2 is the effective focal length of the second lens E2 and f7 is the effective focal length of the seventh lens E7;
ff4= -0.63, where f is the total effective focal length of the optical imaging lens group and f4 is the effective focal length of the fourth lens E4;
(r1+r2)/|f1|=0.08, wherein R1 is the radius of curvature of the object-side surface S1 of the first lens element E1, R2 is the radius of curvature of the image-side surface S2 of the first lens element E1, and f1 is the effective focal length of the first lens element E1;
r6/f3|=0.37, where R6 is the radius of curvature of the image side of the third lens E3, and f3 is the effective focal length of the third lens E3;
TTL/imgh=1.35, where TTL is the distance between the object side surface S1 of the first lens E1 and the imaging surface S19 on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface S19 of the optical imaging lens group;
r12/r11=1.08, where R12 is a radius of curvature of the image side of the sixth lens E6, and R11 is a radius of curvature of the object side of the sixth lens E6;
r15/r16= -0.48, wherein R15 is the radius of curvature of the object-side surface S15 of the eighth lens element E8, and R16 is the radius of curvature of the image-side surface S16 of the eighth lens element E8;
DT61/DT71 = 0.56, wherein DT61 is the maximum effective radius of the object-side surface S11 of the sixth lens E6, and DT71 is the maximum effective radius of the object-side surface S13 of the seventh lens E7;
CT 7/ttlx10=2.25, wherein CT7 is the center thickness of the seventh lens element E7 on the optical axis, and TTL is the distance from the object side surface S1 of the first lens element E1 to the imaging surface S19 on the optical axis;
f123456/f=1.18, where f123456 is the combined focal length of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6, and f is the total effective focal length of the optical imaging lens group;
t67/t78=0.49, where T67 is the distance between the sixth lens E6 and the seventh lens E7 on the optical axis, and T78 is the distance between the seventh lens E7 and the eighth lens E8 on the optical axis.
Fig. 2A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 1, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 2B shows an astigmatism curve of the optical imaging lens group of example 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows distortion curves of the optical imaging lens set of example 1, which represent distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens set of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 2A to 2D, the optical imaging lens set in embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 4 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 2, wherein the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 4 Table 4
As can be seen from table 4, in embodiment 2, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 5 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 5
Table 6 shows the effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 2, the total effective focal length f of the optical imaging lens group, the total optical length TTL, half the diagonal length ImgH of the effective pixel region on the imaging surface S19, and the maximum half field angle HFOV.
f1(mm) 100.00 f7(mm) 12.83
f2(mm) 4.51 f8(mm) -3.69
f3(mm) 11.12 f(mm) 4.25
f4(mm) -6.59 TTL(mm) 5.71
f5(mm) 17.66 ImgH(mm) 4.28
f6(mm) 100.00 HFOV(°) 45.2
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 4B shows an astigmatism curve of the optical imaging lens group of example 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens set of example 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens set of example 2, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 4A to 4D, the optical imaging lens set in embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of an optical imaging lens group according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 7 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 3, wherein the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 7
As can be seen from table 7, in example 3, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.5230E-02 -5.6260E-02 1.8918E-01 -5.9134E-01 1.0794E+00 -1.2305E+00 8.5267E-01 -3.2850E-01 5.4057E-02
S2 -6.2350E-02 -5.6020E-02 1.5705E-01 -4.5712E-01 7.5122E-01 -7.6438E-01 4.5738E-01 -1.4632E-01 1.9304E-02
S3 -1.3690E-02 2.1757E-02 -1.1893E-01 4.5093E-01 -9.4046E-01 1.1768E+00 -8.7630E-01 3.5631E-01 -6.0430E-02
S4 -1.8160E-02 -3.9300E-03 -1.5800E-02 1.7441E-01 -4.7863E-01 7.2071E-01 -6.1594E-01 2.8557E-01 -5.5680E-02
S5 -2.1700E-02 1.7990E-02 1.1093E-02 3.7833E-02 -1.7777E-01 3.5779E-01 -3.7767E-01 2.1131E-01 -4.8910E-02
S6 1.0509E-02 6.9360E-03 1.1525E-02 1.8411E-02 -5.5310E-02 1.1108E-01 -1.3036E-01 8.5067E-02 -2.2880E-02
S7 4.5155E-02 -2.3840E-02 -4.0580E-02 1.4165E-01 -2.4283E-01 2.7044E-01 -1.9301E-01 7.8922E-02 -1.3790E-02
S8 3.2049E-02 -1.8530E-02 2.2331E-02 -4.7460E-02 8.4758E-02 -9.1300E-02 5.7480E-02 -1.9410E-02 2.7050E-03
S9 -6.1340E-02 4.3988E-02 -1.7798E-01 5.1316E-01 -8.6886E-01 9.0599E-01 -5.6671E-01 1.9633E-01 -2.9220E-02
S10 -5.7890E-02 3.0388E-02 -2.1952E-01 5.7293E-01 -8.6601E-01 7.8570E-01 -4.2646E-01 1.2878E-01 -1.6770E-02
S11 5.1723E-02 -1.5580E-02 -7.0620E-02 2.0000E-01 -2.4837E-01 1.5305E-01 -4.2980E-02 1.6960E-03 1.0250E-03
S12 4.1843E-02 -1.2120E-02 1.9499E-02 6.0270E-03 -2.4670E-02 2.2959E-02 -1.1850E-02 3.3760E-03 -4.0000E-04
S13 -1.9600E-02 1.4720E-03 -2.4000E-04 -3.4000E-04 1.9800E-04 -5.0000E-05 7.0100E-06 -5.2000E-07 1.5700E-08
S14 3.5170E-03 -6.5000E-04 -9.2000E-04 3.2900E-04 -5.5000E-05 5.1700E-06 -2.8000E-07 7.5500E-09 -8.1000E-11
S15 1.7050E-03 2.9230E-03 -9.0000E-04 2.9600E-04 -6.5000E-05 8.4500E-06 -6.2000E-07 2.3900E-08 -3.8000E-10
S16 -1.3070E-02 2.7600E-05 4.1700E-04 -1.2000E-04 2.0400E-05 -2.0000E-06 1.1300E-07 -3.4000E-09 4.1400E-11
TABLE 8
Table 9 shows the effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 3, the total effective focal length f of the optical imaging lens group, the total optical length TTL, half the diagonal length ImgH of the effective pixel region on the imaging surface S19, and the maximum half field angle HFOV.
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 3, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 6B shows an astigmatism curve of the optical imaging lens group of example 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens set of example 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve for the optical imaging lens set of example 3, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 6A to 6D, the optical imaging lens set in embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural view of an optical imaging lens group according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 10 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 4, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 10
As can be seen from table 10, in example 4, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 11 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 11
Table 12 shows the effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 4, the total effective focal length f of the optical imaging lens group, the total optical length TTL, half the diagonal length ImgH of the effective pixel region on the imaging surface S19, and the maximum half field angle HFOV.
f1(mm) 100.00 f7(mm) 10.54
f2(mm) 5.63 f8(mm) -3.60
f3(mm) 8.41 f(mm) 4.02
f4(mm) -7.11 TTL(mm) 5.48
f5(mm) 10.64 ImgH(mm) 4.28
f6(mm) -40.54 HFOV(°) 47.1
Table 12
Fig. 8A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 4, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 8B shows an astigmatism curve of the optical imaging lens group of example 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens set of example 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve for the optical imaging lens set of example 4, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 8A to 8D, the optical imaging lens set in embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural view of an optical imaging lens group according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 13 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 5, wherein the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 13
As can be seen from table 13, in example 5, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -3.2360E-02 4.5980E-03 -1.3313E-01 3.9171E-01 -7.4369E-01 8.3026E-01 -5.5636E-01 2.1022E-01 -3.4440E-02
S2 -3.8990E-02 -1.9060E-02 -1.3510E-02 7.8517E-02 -2.5131E-01 3.5420E-01 -3.0060E-01 1.4416E-01 -2.8990E-02
S3 -2.0490E-02 4.4491E-02 -1.9666E-01 6.1871E-01 -1.1030E+00 1.2499E+00 -8.8951E-01 3.5917E-01 -6.1820E-02
S4 -3.5730E-02 -2.6100E-03 -1.0750E-02 1.7799E-01 -4.7758E-01 7.2025E-01 -6.1594E-01 2.8557E-01 -5.5680E-02
S5 -1.6220E-02 2.0747E-02 9.7670E-03 3.6063E-02 -1.7855E-01 3.5789E-01 -3.7767E-01 2.1131E-01 -4.8910E-02
S6 -1.9790E-02 -4.1100E-03 1.0647E-02 1.9562E-02 -5.4420E-02 1.1151E-01 -1.3036E-01 8.5067E-02 -2.2880E-02
S7 7.2120E-03 -2.9930E-02 -8.2200E-02 3.3458E-01 -6.4826E-01 7.7478E-01 -5.5430E-01 2.1596E-01 -3.4980E-02
S8 3.5073E-02 -1.6960E-02 2.2641E-02 -4.7430E-02 8.4685E-02 -9.1410E-02 5.7389E-02 -1.9350E-02 2.7050E-03
S9 -3.2830E-02 4.4566E-02 -1.7987E-01 5.1185E-01 -8.6956E-01 9.0575E-01 -5.6663E-01 1.9653E-01 -2.9220E-02
S10 -5.1730E-02 2.4062E-02 -2.2224E-01 5.7266E-01 -8.6595E-01 7.8572E-01 -4.2645E-01 1.2880E-01 -1.6770E-02
S11 4.7943E-02 -1.4970E-02 -6.9650E-02 2.0036E-01 -2.4823E-01 1.5302E-01 -4.3150E-02 1.5150E-03 1.0250E-03
S12 2.9613E-02 -2.2100E-03 2.3938E-02 -2.3060E-02 2.4138E-02 -1.6130E-02 3.8300E-03 4.2800E-04 -2.1000E-04
S13 -2.3630E-02 7.8390E-03 -6.3800E-03 2.7180E-03 -8.8000E-04 1.9700E-04 -3.1000E-05 3.1900E-06 -1.5000E-07
S14 1.9620E-03 2.1330E-03 -1.8200E-03 5.1400E-04 -8.1000E-05 7.7600E-06 -4.5000E-07 1.3500E-08 -1.5000E-10
S15 -7.1400E-03 4.5010E-03 -6.8000E-04 2.4000E-04 -6.4000E-05 9.0100E-06 -6.9000E-07 2.7300E-08 -4.4000E-10
S16 -1.9710E-02 3.0570E-03 -5.4000E-04 9.1300E-05 -1.4000E-05 1.5200E-06 -1.1000E-07 3.9800E-09 -6.1000E-11
TABLE 14
Table 15 shows the effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 5, the total effective focal length f of the optical imaging lens group, the total optical length TTL, half the diagonal length ImgH of the effective pixel region on the imaging surface S19, and the maximum half field angle HFOV.
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 5, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 10B shows an astigmatism curve of the optical imaging lens group of example 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens set of example 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve for the optical imaging lens set of example 5, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 10A to 10D, the optical imaging lens set provided in embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 16 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 6, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 16
As can be seen from table 16, in example 6, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 17 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 17
Table 18 shows the effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 6, the total effective focal length f of the optical imaging lens group, the total optical length TTL, half the diagonal length ImgH of the effective pixel region on the imaging surface S19, and the maximum half field angle HFOV.
f1(mm) 99.97 f7(mm) 17.95
f2(mm) 4.57 f8(mm) -3.46
f3(mm) -100.00 f(mm) 4.03
f4(mm) -16.67 TTL(mm) 5.44
f5(mm) 9.99 ImgH(mm) 4.29
f6(mm) 48.22 HFOV(°) 46.8
TABLE 18
Fig. 12A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 12B shows an astigmatism curve of the optical imaging lens group of example 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens set of example 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve for the optical imaging lens set of example 6, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 12A to 12D, the optical imaging lens set in embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic structural view of an optical imaging lens group according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 19 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 7, wherein the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 19
As can be seen from table 19, in example 7, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -3.9430E-02 -2.3960E-02 4.8979E-02 -9.5200E-02 6.8382E-02 1.8669E-02 -8.8800E-02 6.6713E-02 -1.6280E-02
S2 -6.8560E-02 -1.3210E-02 1.4667E-02 -3.6910E-02 3.5284E-02 -7.7000E-04 -7.5840E-02 7.1897E-02 -1.9520E-02
S3 -3.0500E-02 3.6690E-02 -1.8196E-01 5.7997E-01 -1.0556E+00 1.2490E+00 -9.2190E-01 3.7728E-01 -6.4430E-02
S4 -3.0110E-02 -5.6400E-03 -1.0620E-02 1.7996E-01 -4.7612E-01 7.2089E-01 -6.1594E-01 2.8557E-01 -5.5680E-02
S5 -1.9140E-02 1.8293E-02 9.8680E-03 3.6098E-02 -1.7830E-01 3.5841E-01 -3.7767E-01 2.1131E-01 -4.8910E-02
S6 -3.4300E-02 -1.0430E-02 4.9550E-03 1.7453E-02 -5.4460E-02 1.1214E-01 -1.3036E-01 8.5067E-02 -2.2880E-02
S7 -8.8800E-03 -1.8910E-02 -1.7046E-01 6.1390E-01 -1.1810E+00 1.4037E+00 -9.9180E-01 3.8115E-01 -6.1290E-02
S8 2.8479E-02 -1.8510E-02 2.4098E-02 -4.6910E-02 8.4664E-02 -9.1500E-02 5.7355E-02 -1.9360E-02 2.7050E-03
S9 -4.4790E-02 5.0012E-02 -1.8164E-01 5.1017E-01 -8.7004E-01 9.0579E-01 -5.6656E-01 1.9657E-01 -2.9220E-02
S10 -4.7090E-02 2.4236E-02 -2.2227E-01 5.7308E-01 -8.6568E-01 7.8584E-01 -4.2638E-01 1.2885E-01 -1.6770E-02
S11 4.3402E-02 -1.7180E-02 -6.9920E-02 2.0060E-01 -2.4786E-01 1.5336E-01 -4.2900E-02 1.6680E-03 1.0250E-03
S12 4.4958E-02 -1.9090E-02 4.7712E-02 -4.9690E-02 4.3924E-02 -2.7000E-02 9.0740E-03 -1.3500E-03 5.1700E-05
S13 -1.2290E-02 6.9960E-03 -6.8000E-03 3.4250E-03 -1.1600E-03 2.3600E-04 -2.8000E-05 1.7100E-06 -4.3000E-08
S14 2.6320E-03 3.8840E-03 -2.6900E-03 8.9500E-04 -2.0000E-04 3.0700E-05 -2.8000E-06 1.4300E-07 -3.0000E-09
S15 -3.4200E-03 -3.8000E-04 7.5700E-04 3.6800E-06 -3.8000E-05 7.2600E-06 -6.6000E-07 3.1000E-08 -5.9000E-10
S16 -1.7210E-02 7.7100E-04 5.6500E-05 2.6500E-05 -1.5000E-05 2.5100E-06 -2.0000E-07 8.1900E-09 -1.3000E-10
Table 20
Table 21 shows effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 7, a total effective focal length f of the optical imaging lens group, an optical total length TTL, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S19, and a maximum half field angle.
f1(mm) -100.00 f7(mm) 10.01
f2(mm) 4.15 f8(mm) -3.16
f3(mm) -48.77 f(mm) 4.08
f4(mm) -18.31 TTL(mm) 5.63
f5(mm) 10.29 ImgH(mm) 4.29
f6(mm) 100.00 HFOV(°) 46.4
Table 21
Fig. 14A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 7, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 14B shows an astigmatism curve of the optical imaging lens group of example 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the optical imaging lens set of example 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve for the optical imaging lens set of example 7, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 14A to 14D, the optical imaging lens set of embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging 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 an optical imaging lens group according to embodiment 8 of the present application.
As shown in fig. 15, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 22 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 8, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 22
As can be seen from table 22, in example 8, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 23 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 23
Table 24 shows effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 8, a total effective focal length f of the optical imaging lens group, an optical total length TTL, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S19, and a maximum half field angle HFOV.
f1(mm) 100.00 f7(mm) 10.43
f2(mm) 4.88 f8(mm) -3.56
f3(mm) 99.28 f(mm) 4.07
f4(mm) -15.28 TTL(mm) 5.50
f5(mm) -100.00 ImgH(mm) 4.29
f6(mm) 10.53 HFOV(°) 45.7
Table 24
Fig. 16A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 8, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 16B shows an astigmatism curve of the optical imaging lens group of example 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the optical imaging lens set of example 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve for the optical imaging lens set of example 8, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 16A to 16D, the optical imaging lens set in embodiment 8 can achieve good imaging quality.
Example 9
An optical imaging 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 structural view of an optical imaging lens group according to embodiment 9 of the present application.
As shown in fig. 17, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 25 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 9, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 25
As is clear from table 25, in example 9, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 26 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 9, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.0090E-02 -3.8660E-02 1.0210E-01 -1.2814E-01 -4.0270E-02 2.8052E-01 -3.2690E-01 1.6644E-01 -3.2230E-02
S2 -7.5190E-02 -3.9020E-02 1.4898E-01 -3.0837E-01 2.8921E-01 -3.4430E-02 -2.0416E-01 1.6702E-01 -4.0730E-02
S3 -3.1460E-02 2.3373E-02 -1.5898E-01 6.8360E-01 -1.5181E+00 1.9984E+00 -1.5386E+00 6.3475E-01 -1.0776E-01
S4 -1.8000E-02 -7.7300E-03 -1.6810E-02 1.7984E-01 -4.7498E-01 7.2055E-01 -6.1594E-01 2.8557E-01 -5.5680E-02
S5 -2.0060E-02 1.0148E-02 1.0029E-02 3.6385E-02 -1.7777E-01 3.5878E-01 -3.7767E-01 2.1131E-01 -4.8910E-02
S6 -5.4490E-02 -5.0000E-04 3.2750E-03 1.5808E-02 -5.4130E-02 1.1163E-01 -1.3036E-01 8.5067E-02 -2.2880E-02
S7 -2.9220E-02 -4.8000E-04 -2.4069E-01 7.8992E-01 -1.4921E+00 1.7359E+00 -1.1998E+00 4.5115E-01 -7.0990E-02
S8 3.4082E-02 -2.4710E-02 2.4637E-02 -4.5860E-02 8.4652E-02 -9.1870E-02 5.7224E-02 -1.9370E-02 2.7050E-03
S9 -5.6980E-02 5.8117E-02 -1.7782E-01 5.1071E-01 -8.7031E-01 9.0547E-01 -5.6672E-01 1.9651E-01 -2.9220E-02
S10 -4.3530E-02 3.0867E-02 -2.2023E-01 5.7308E-01 -8.6611E-01 7.8551E-01 -4.2652E-01 1.2879E-01 -1.6770E-02
S11 2.2124E-02 -1.0670E-02 -6.9200E-02 1.9968E-01 -2.4833E-01 1.5328E-01 -4.3200E-02 1.4850E-03 1.0250E-03
S12 -1.0710E-02 3.9898E-02 -9.3170E-02 1.7487E-01 -1.8114E-01 1.1916E-01 -5.1860E-02 1.3333E-02 -1.4800E-03
S13 -1.5480E-02 3.6170E-03 -2.1400E-03 8.4300E-04 -2.1000E-04 2.9900E-05 -2.4000E-06 9.7800E-08 -1.5000E-09
S14 4.7080E-03 -3.7400E-03 6.8200E-04 7.7400E-05 -4.4000E-05 6.3600E-06 -4.2000E-07 1.1800E-08 -6.6000E-11
S15 -3.3050E-02 9.9030E-03 -1.0600E-03 2.8900E-04 -8.2000E-05 1.2200E-05 -9.5000E-07 3.8200E-08 -6.2000E-10
S16 -1.0790E-02 -5.9200E-03 3.3640E-03 -8.1000E-04 1.1600E-04 -1.0000E-05 5.5100E-07 -1.6000E-08 2.0800E-10
Table 26
Table 27 shows effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 9, a total effective focal length f of the optical imaging lens group, an optical total length TTL, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S19, and a maximum half field angle HFOV.
f1(mm) -100.00 f7(mm) 7.55
f2(mm) 4.49 f8(mm) -3.41
f3(mm) -300.00 f(mm) 4.00
f4(mm) -21.10 TTL(mm) 5.48
f5(mm) -100.00 ImgH(mm) 4.29
f6(mm) 12.81 HFOV(°) 46.3
Table 27
Fig. 18A shows an on-axis chromatic aberration curve for the optical imaging lens set of example 9, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 18B shows an astigmatism curve of the optical imaging lens group of example 9, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 18C shows a distortion curve of the optical imaging lens set of example 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18D shows a chromatic aberration of magnification curve of the optical imaging lens set of example 9, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 18A to 18D, the optical imaging lens set in embodiment 9 can achieve good imaging quality.
Example 10
An optical imaging lens group according to embodiment 10 of the present application is described below with reference to fig. 19 to 20D. Fig. 19 shows a schematic structural view of an optical imaging lens group according to embodiment 10 of the present application.
As shown in fig. 19, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and imaging plane S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 28 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the lenses of the optical imaging lens group of example 10, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 28
As can be seen from table 28, in embodiment 10, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 29 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 10, where each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 29
Table 30 shows effective focal lengths f1 to f8 of the respective lenses of the optical imaging lens group in example 10, a total effective focal length f of the optical imaging lens group, an optical total length TTL, a half of the diagonal length ImgH of the effective pixel region on the imaging surface S19, and a maximum half field angle HFOV.
f1(mm) -100.02 f7(mm) 16.93
f2(mm) 5.21 f8(mm) -3.48
f3(mm) 8.27 f(mm) 4.08
f4(mm) -8.33 TTL(mm) 5.48
f5(mm) -100.00 ImgH(mm) 4.20
f6(mm) 10.76 HFOV(°) 46.2
Table 30
Fig. 20A shows an on-axis chromatic aberration curve for the optical imaging lens set of embodiment 10, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 20B shows an astigmatism curve of the optical imaging lens group of embodiment 10, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 20C shows a distortion curve of the optical imaging lens set of example 10, which represents distortion magnitude values corresponding to different image heights. Fig. 20D shows a chromatic aberration of magnification curve of the optical imaging lens set of embodiment 10, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 20A to 20D, the optical imaging lens set in embodiment 10 can achieve good imaging quality.
In summary, examples 1 to 10 satisfy the relationships shown in table 31, respectively.
Table 31
The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the optical imaging lens group described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (15)

1. The optical imaging lens group sequentially comprises, 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, characterized in that,
The first lens has optical power;
the second lens has positive optical power;
the third lens has optical power;
the fourth lens has negative focal power;
the fifth lens has optical power;
the sixth lens is provided with focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens has positive optical power;
the eighth lens has negative focal power;
the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and half of the diagonal length of an effective pixel area on the imaging surface of the optical imaging lens group meet the condition that TTL/ImgH is less than 1.4;
a separation distance T67 of the sixth lens and the seventh lens on the optical axis and a separation distance T78 of the seventh lens and the eighth lens on the optical axis satisfy 0.4 < T67/T78 < 1.0; and
the number of lenses having optical power in the optical imaging lens group is eight.
2. The optical imaging lens set according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens, a radius of curvature R2 of an image side surface of the first lens, and an effective focal length f1 of the first lens satisfy 0 < (r1+r2)/|f1| < 0.5.
3. The optical imaging lens set according to claim 1, wherein a radius of curvature R6 of an image side surface of the third lens and an effective focal length f3 of the third lens satisfy 0 < |r6/f3| < 0.8.
4. The optical imaging lens set according to claim 1, wherein a radius of curvature R12 of an image side surface of the sixth lens and a radius of curvature R11 of an object side surface of the sixth lens satisfy 0.3 < R12/R11 < 1.3.
5. The optical imaging lens set according to 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-0.8 < R15/R16 < -0.3.
6. The optical imaging lens set of claim 1, wherein a total effective focal length f of the optical imaging lens set and an effective focal length f4 of the fourth lens satisfy-0.8 < f/f4 < 0.
7. The optical imaging lens assembly of claim 6, wherein an image side of said fourth lens element is concave.
8. The optical imaging lens set of claim 1, wherein an effective focal length f2 of the second lens and an effective focal length f7 of the seventh lens satisfy 0 < f2/f7 < 0.8.
9. The optical imaging lens set of claim 1, wherein the object side surface of the second lens is convex.
10. The optical imaging lens set of claim 1, wherein an object side surface of the seventh lens is convex.
11. The optical imaging lens assembly of claim 1, wherein a center thickness CT7 of the seventh lens element on the optical axis and a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens assembly on the optical axis satisfy 1.5 < CT7/TTL x 10 < 2.5.
12. The optical imaging lens set according to claim 1, wherein a maximum effective radius DT61 of an object-side surface of the sixth lens and a maximum effective radius DT71 of an object-side surface of the seventh lens satisfy 0.2 < DT61/DT71 < 0.7.
13. The optical imaging lens set of any of claims 1 to 12, wherein a combined focal length f123456 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens and a total effective focal length f of the optical imaging lens set satisfy 1.0 < f123456/f < 1.5.
14. The optical imaging lens set of any of claims 1 to 12, wherein a maximum half field angle HFOV of the optical imaging lens set satisfies 40 ° < HFOV < 50 °.
15. The optical imaging lens set of claim 14, wherein the total effective focal length f of the optical imaging lens set and the entrance pupil diameter EPD of the optical imaging lens set satisfy f/EPD < 2.0.
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