CN108873254B - Optical imaging system - Google Patents

Optical imaging system Download PDF

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Publication number
CN108873254B
CN108873254B CN201810730916.0A CN201810730916A CN108873254B CN 108873254 B CN108873254 B CN 108873254B CN 201810730916 A CN201810730916 A CN 201810730916A CN 108873254 B CN108873254 B CN 108873254B
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China
Prior art keywords
lens
imaging system
optical imaging
optical
image
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CN201810730916.0A
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CN108873254A (en
Inventor
高雪
李明
贺凌波
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201810730916.0A priority Critical patent/CN108873254B/en
Publication of CN108873254A publication Critical patent/CN108873254A/en
Priority to PCT/CN2019/078954 priority patent/WO2020007068A1/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
    • 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 system, 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 and a seventh lens. Wherein the first lens and the seventh lens both have negative optical power; the second lens, the fourth lens and the fifth lens all have positive focal power or negative focal power; the third lens and the sixth lens both have positive optical power; the object side surface of the first lens is a concave surface; and the curvature radius R10 of the image side of the fifth lens and the curvature radius R12 of the image side of the sixth lens satisfy 4 < R10/R12 < 6.5.

Description

Optical imaging system
Technical Field
The present application relates to an optical imaging system, and more particularly, to an optical imaging system including seven lenses.
Background
With the increase of the living standard of substances, the demands of people for photography/video are gradually increasing. As the price of single-lens reflex cameras and micro-lens reflex cameras is high, the camera function added to portable electronic products such as smart phones has become one of the main choices of people. However, the imaging quality of the additional lens of the mobile phone is not ideal at present, especially the resolution of the edge view field of the additional lens is far less than that of the center view field, and aberration such as distortion, chromatic aberration and the like also exist, so that the imaging quality of the additional lens is affected, and the additional lens cannot meet the shooting requirement of a user.
Therefore, how to reduce aberration such as distortion and chromatic aberration of the wide-angle additional lens of the mobile phone and improve imaging quality is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The present application provides an optical imaging system, e.g., a wide angle lens, applicable to portable electronic products that at least addresses or partially addresses at least one of the above-mentioned shortcomings of the prior art.
In one aspect, the present application provides an optical imaging system 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The curvature radius R10 of the image side of the fifth lens and the curvature radius R12 of the image side of the sixth lens can satisfy 4 < R10/R12 < 6.5.
In one embodiment, the image side of the third lens may be convex; the effective focal length f3 of the third lens and the curvature radius R6 of the image side of the third lens can satisfy-2 < f3/R6 < -1.
In one embodiment, the maximum half field angle HFOV of the optical imaging system may satisfy 45 < HFOV < 55.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy 1 < R7/R8 < 2.
In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging system may satisfy-7.5 < f1/f < -3.5.
In one embodiment, the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens may satisfy 2 < R13/R14 < 3.
In one embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens may satisfy-1.5 < f6/f7 < -0.5.
In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis can satisfy 1 < CT1/CT2 < 2.
In one embodiment, the spacing distance T23 between the second lens and the third lens on the optical axis and the center thickness CT3 of the third lens on the optical axis can satisfy 1 < T23/CT3 < 2.5.
In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT71 of the object-side surface of the seventh lens may satisfy 1 < DT11/DT71 < 1.5.
In one embodiment, the maximum effective radius DT12 of the image side of the first lens and half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system may satisfy 0.6 < DT12/ImgH < 1.
In one embodiment, the separation distance T45 between the fourth lens and the fifth lens on the optical axis, the separation distance T56 between the fifth lens and the sixth lens on the optical axis, and the separation distance T67 between the sixth lens and the seventh lens on the optical axis may satisfy 0.3 < T45/(t56+t67) < 1.8.
In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens may satisfy |f/f2| < 0.1.
In another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power, and an image side surface thereof may be convex; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The distance T23 between the second lens and the third lens on the optical axis and the center thickness CT3 of the third lens on the optical axis can satisfy 1 < T23/CT3 < 2.5.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. Wherein the maximum half field angle HFOV of the optical imaging system may satisfy 45 DEG < HFOV < 55 deg.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens can satisfy 1 < R7/R8 < 2.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The effective focal length f1 of the first lens and the total effective focal length f of the optical imaging system can meet the condition that f1/f is less than-7.5 and less than-3.5.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The radius of curvature R13 of the object-side surface of the seventh lens element and the radius of curvature R14 of the image-side surface of the seventh lens element may satisfy 2 < R13/R14 < 3.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens can satisfy-2 < f3/R6 < -1.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. The maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT71 of the object side of the seventh lens may satisfy 1 < DT11/DT71 < 1.5.
In yet another aspect, the present application further provides an optical imaging system, 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 and a seventh lens. The first lens can have negative focal power, and the object side surface of the first lens can be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power. Wherein, the maximum effective radius DT12 of the image side surface of the first lens and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system can satisfy 0.6 < DT12/ImgH < 1.
The application adopts a plurality of (e.g. seven) lenses, and the optical imaging system has at least one beneficial effect of wide angle, good imaging quality, low sensitivity, miniaturization and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens 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 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 1;
fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 2;
fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 3;
fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 4;
fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 5;
Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 6;
fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 7;
fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system of embodiment 8;
fig. 17 shows a schematic configuration diagram of an optical imaging system 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 system of embodiment 9.
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 near the object side is referred to as the object side of the lens, and the surface of each lens near the image side 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 system according to the exemplary embodiment of the present application may include, for example, seven lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven 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 may have negative optical power, and its object-side surface may be concave; the second lens has positive optical power or negative optical power; the third lens may have positive optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens may have positive optical power; the seventh lens may have negative optical power.
In an exemplary embodiment, the image side surface of the third lens may be convex.
In an exemplary embodiment, the object-side surface of the fourth lens may be convex, and the image-side surface may be concave.
In an exemplary embodiment, the image side surface of the fifth lens may be convex.
In an exemplary embodiment, the image side surface of the sixth lens may be convex.
In an exemplary embodiment, the object-side surface of the seventh lens may be convex and the image-side surface may be concave.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression-7.5 < f1/f < -3.5, where f1 is an effective focal length of the first lens and f is a total effective focal length of the optical imaging system. More specifically, f and f1 may further satisfy-5.5.ltoreq.f1/f < -3.5, for example, -5.07.ltoreq.f1/f.ltoreq.3.85. The effective focal length of the first lens is reasonably set to enable the first lens to meet negative focal power, the function of adjusting the light position can be achieved, and meanwhile the sensitivity of an optical system can be reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition-2 < f3/R6 < -1, where f3 is an effective focal length of the third lens and R6 is a radius of curvature of an image side surface of the third lens. More specifically, f3 and R6 may further satisfy-1.83.ltoreq.f3/R6.ltoreq.1.37. The effective focal length of the third lens of the optical system and the curvature radius of the image side surface of the third lens are reasonably controlled, so that aberration can be easily balanced, and the optical Modulation Transfer Function (MTF) performance of the system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 45 ° < HFOV < 55 °, where HFOV is the maximum half field angle of the optical imaging system. More specifically, HFOV's further may satisfy 45.1 and 47.5. The maximum field angle of the optical imaging system is reasonably controlled, and the wide-angle performance of the optical system can be effectively ensured.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 1 < R7/R8 < 2, where R7 is a radius of curvature of an object side surface of the fourth lens element, and R8 is a radius of curvature of an image side surface of the fourth lens element. More specifically, R7 and R8 may further satisfy 1.04.ltoreq.R7/R8.ltoreq.1.79. The ratio of the curvature radius of the object side surface of the fourth lens to the curvature radius of the image side surface of the fourth lens of the optical system is reasonably controlled, so that the chromatic aberration and distortion of the optical system can be effectively improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 4 < R10/R12 < 6.5, where R10 is a radius of curvature of the image side of the fifth lens element and R12 is a radius of curvature of the image side of the sixth lens element. More specifically, R10 and R12 may further satisfy 4.28.ltoreq.R10/R12.ltoreq.6.24. The curvature radius of the image side surface of the fifth lens and the curvature radius of the image side surface of the sixth lens are reasonably arranged, so that the optical system has a larger aperture, and the overall brightness of imaging is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 2 < R13/R14 < 3, where R13 is a radius of curvature of an object side surface of the seventh lens, and R14 is a radius of curvature of an image side surface of the seventh lens. More specifically, R13 and R14 may further satisfy 2.35.ltoreq.R13/R14.ltoreq.2.73. The curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the seventh lens are reasonably distributed, and the light trend of the outer view field can be controlled, so that the optical system can be better matched with the chief ray angle of the chip.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition-1.5 < f6/f7 < -0.5, where f6 is the effective focal length of the sixth lens and f7 is the effective focal length of the seventh lens. More specifically, f6 and f7 may further satisfy-1.2.ltoreq.f6/f7.ltoreq.0.8, for example, -1.05.ltoreq.f6/f7.ltoreq.0.98. The ratio of the effective focal length of the sixth lens to the effective focal length of the seventh lens is reasonably set, so that the seventh lens has negative focal power under the condition that the sixth lens has positive focal power, the angles of incident light rays and emergent light rays of the lens can be adjusted, and chromatic aberration of an optical system can be effectively corrected.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition 1 < CT1/CT2 < 2, where CT1 is a central thickness of the first lens on the optical axis and CT2 is a central thickness of the second lens on the optical axis. More specifically, CT1 and CT2 may further satisfy 1.3.ltoreq.CT1/CT 2.ltoreq.1.9, for example 1.48.ltoreq.CT1/CT 2.ltoreq.1.86. The ratio of the center thickness of the first lens on the optical axis to the center thickness of the second lens on the optical axis is reasonably controlled, so that the on-axis chromatic aberration of the optical system can be effectively corrected, and the imaging quality of the optical system can be effectively improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 1 < T23/CT3 < 2.5, where T23 is a distance between the second lens and the third lens on the optical axis, and CT3 is a center thickness of the third lens on the optical axis. More specifically, T23 and CT3 may further satisfy 1 < T23/CT3 < 2.2, for example, 1.10.ltoreq.T23/CT 3.ltoreq.2.00. The ratio of the spacing distance of the second lens and the third lens on the optical axis to the central thickness of the third lens on the optical axis is reasonably controlled, so that the front end size of the optical system can be effectively shortened, and good machining gaps between the optical lenses are ensured.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition that 1 < DT11/DT71 < 1.5, wherein DT11 is a maximum effective radius of an object side surface of the first lens and DT71 is a maximum effective radius of an object side surface of the seventh lens. More specifically, DT11 and DT71 may further satisfy 1.25.ltoreq.DT 11/DT 71.ltoreq.1.39. The ratio of the maximum effective radius of the first lens object side surface to the maximum effective radius of the seventh lens object side surface is reasonably controlled, so that the incidence angle of marginal rays can be effectively reduced, and good tolerance characteristics of the optical system are ensured.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.6 < DT12/ImgH < 1, where DT12 is the maximum effective radius of the image side surface of the first lens and ImgH is half the diagonal length of the effective pixel region on the imaging surface. More specifically, DT12 and ImgH may further satisfy 0.66.ltoreq.DT 12/ImgH.ltoreq.0.76. The ratio of the maximum effective radius of the image side surface of the first lens to half of the diagonal length of the effective pixel area on the imaging surface is reasonably controlled, so that the front end miniaturization of the optical system can be effectively ensured, and the optical system can meet the structural characteristic of small size.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < T45/(t56+t67) < 1.8, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, T56 is the distance between the fifth lens and the sixth lens on the optical axis, and T67 is the distance between the sixth lens and the seventh lens on the optical axis. More specifically, T45, T56 and T67 may further satisfy 0.31.ltoreq.T45/(T56+T67). Ltoreq.1.78. Satisfies the condition that T45/(T56+T67) < 1.8 is less than 0.3, and can effectively ensure miniaturization of the lens. By reasonably distributing the center thickness of each lens, the deflection of light rays tends to be relaxed, the sensitivity is reduced, and meanwhile, the astigmatism, distortion and chromatic aberration of the system can be reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression |f/f2| < 0.1, where f is the total effective focal length of the optical imaging system and f2 is the effective focal length of the second lens. More specifically, f and f2 may further satisfy 0.001. Ltoreq.f/f2. Ltoreq.0.077. The ratio between the total effective focal length of the optical system and the effective focal length of the second lens is reasonably set, so that the chromatic aberration of the optical system can be effectively balanced, and the imaging quality of the optical system can be further improved.
In an exemplary embodiment, the optical imaging system may further include at least one diaphragm to improve imaging quality of the optical imaging system. Optionally, a stop may be provided between the second lens and the third lens.
Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.
The optical imaging system according to the above embodiment of the present application may employ a plurality of lenses, such as seven lenses 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 lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the optical imaging system is more beneficial to production and processing and is applicable to portable electronic products. The optical imaging system configured as described above can also have the advantageous effects of wide angle, excellent imaging quality, low sensitivity, and the like.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror. 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.
However, those skilled in the art will appreciate that the number of lenses making up an optical imaging system 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 seven lenses are described as an example in the embodiment, the optical imaging system is not limited to include seven lenses. The optical imaging system may also include other numbers of lenses, if desired.
Specific examples of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application.
As shown in fig. 1, an optical imaging system according to an exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has negative 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 1, in which 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 seventh lens element E7 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-S14 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 2.2960E-01 -1.7947E-01 1.1360E-01 -2.3070E-02 -5.2950E-02 7.0194E-02 -3.9840E-02 1.0978E-02 -1.1800E-03
S2 3.3026E-02 -9.7390E-02 1.5272E-01 -2.6380E-01 4.1970E-01 -4.1660E-01 2.3284E-01 -6.8210E-02 8.2480E-03
S3 -4.8710E-02 -3.7190E-02 1.0111E+00 -3.3983E+00 6.1236E+00 -6.6966E+00 4.3802E+00 -1.5684E+00 2.3632E-01
S4 2.7048E-01 6.6653E-02 -6.5651E-01 6.1642E+00 -2.6123E+01 6.0398E+01 -8.0573E+01 5.7478E+01 -1.6853E+01
S5 3.1061E-02 5.2372E-01 -1.9795E+01 2.5649E+02 -2.1656E+03 1.1599E+04 -3.8243E+04 7.0578E+04 -5.5866E+04
S6 -8.4604E-01 9.5382E+00 -8.6952E+01 5.7234E+02 -2.5863E+03 7.7032E+03 -1.4408E+04 1.5341E+04 -7.1044E+03
S7 -7.8681E-01 5.4220E+00 -4.3860E+01 2.4485E+02 -9.0759E+02 2.1784E+03 -3.2309E+03 2.6980E+03 -9.7936E+02
S8 -3.0595E-01 -4.6137E-01 4.2092E+00 -2.0181E+01 6.8262E+01 -1.5475E+02 2.1977E+02 -1.7294E+02 5.6549E+01
S9 2.0432E-01 -1.1039E-01 -1.1108E+00 5.7354E+00 -1.4081E+01 1.9874E+01 -1.6458E+01 7.4709E+00 -1.4395E+00
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 1.5254E-01 -1.0186E+00 3.5464E+00 -7.5498E+00 9.9668E+00 -8.1444E+00 3.9988E+00 -1.0455E+00 9.1429E-02
S12 3.7501E-01 -7.0468E-01 1.3978E+00 -3.2172E-01 -3.9175E+00 7.7154E+00 -6.6893E+00 2.8653E+00 -4.9495E-01
S13 -1.0398E+00 1.0416E+00 -8.6910E-02 -1.6958E+00 2.1577E+00 -8.7772E-01 -2.4977E-01 3.2850E-01 -7.9380E-02
S14 -6.1958E-01 1.1644E+00 -1.5708E+00 1.4537E+00 -9.2386E-01 3.9586E-01 -1.0910E-01 1.7417E-02 -1.2200E-03
TABLE 2
Table 3 gives the effective focal lengths f1 to f7 of the respective lenses in embodiment 1, the total effective focal length f of the optical imaging system, the total optical length TTL (i.e., the distance on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1), and the maximum half field angle HFOV.
f1(mm) -8.06 f6(mm) 2.00
f2(mm) -30.92 f7(mm) -1.92
f3(mm) 2.19 f(mm) 1.90
f4(mm) -9.05 TTL(mm) 4.94
f5(mm) 12.90 HFOV(°) 47.5
TABLE 3 Table 3
The optical imaging system in embodiment 1 satisfies:
f1/f= -4.24, where f1 is the effective focal length of the first lens E1, and f is the total effective focal length of the optical imaging system;
f3/r6= -1.42, where f3 is the effective focal length of the third lens E3, and R6 is the radius of curvature of the image-side surface S6 of the third lens E3;
HFOV = 47.5 °, wherein HFOV is the maximum half field angle of the optical imaging system;
r7/r8=1.58, where R7 is the radius of curvature of the object-side surface S7 of the fourth lens element E4, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens element E4;
r10/r12=5.08, where R10 is the radius of curvature of the image-side surface S10 of the fifth lens element E5, and R12 is the radius of curvature of the image-side surface S12 of the sixth lens element E6;
r13/r14=2.35, where R13 is a radius of curvature of the object-side surface S13 of the seventh lens element E7, and R14 is a radius of curvature of the image-side surface S14 of the seventh lens element E7;
f6/f7= -1.04, where f6 is the effective focal length of the sixth lens E6 and f7 is the effective focal length of the seventh lens E7;
CT1/CT2 = 1.48, wherein CT1 is the center thickness of the first lens element E1 on the optical axis, and CT2 is the center thickness of the second lens element E2 on the optical axis;
t23/ct3=1.36, where T23 is the distance between the second lens E2 and the third lens E3 on the optical axis, and CT3 is the center thickness of the third lens E3 on the optical axis;
DT11/DT71 = 1.25, wherein DT11 is the maximum effective radius of the object-side surface S1 of the first lens E1, and DT71 is the maximum effective radius of the object-side surface S13 of the seventh lens E7;
DT 12/imgh=0.66, where DT12 is the maximum effective radius of the image side surface S2 of the first lens E1, imgH is half the diagonal length of the effective pixel area on the imaging plane;
t45/(t56+t67) =1.04, where T45 is the distance between the fourth lens E4 and the fifth lens E5 on the optical axis, T56 is the distance between the fifth lens E5 and the sixth lens E6 on the optical axis, and T67 is the distance between the sixth lens E6 and the seventh lens E7 on the optical axis;
i f/f2|=0.061, where f is the total effective focal length of the optical imaging system and f2 is the effective focal length of the second lens E2.
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 2B shows an astigmatism curve of the optical imaging system of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the optical imaging system of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 2D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging system of embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has negative 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 4 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 2, in which 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 seventh lens element E7 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.3044E-01 -1.8421E-01 1.2383E-01 -3.9620E-02 -3.2120E-02 5.1227E-02 -2.9070E-02 7.7160E-03 -7.8000E-04
S2 3.2244E-02 -9.2290E-02 1.3806E-01 -2.2914E-01 3.5812E-01 -3.4950E-01 1.9140E-01 -5.4820E-02 6.4720E-03
S3 -5.5920E-02 -5.4050E-02 1.2765E+00 -4.3855E+00 8.0893E+00 -8.9984E+00 5.9566E+00 -2.1538E+00 3.2763E-01
S4 2.6857E-01 -6.2020E-02 5.5948E-01 7.5271E-01 -1.2143E+01 3.8994E+01 -6.1361E+01 4.7910E+01 -1.4728E+01
S5 -3.5400E-03 2.2410E+00 -6.1005E+01 8.3316E+02 -7.1055E+03 3.7914E+04 -1.2330E+05 2.2326E+05 -1.7259E+05
S6 -9.1336E-01 1.0497E+01 -8.9787E+01 5.3815E+02 -2.1823E+03 5.7158E+03 -9.0832E+03 7.7531E+03 -2.5972E+03
S7 -8.8952E-01 7.1529E+00 -5.9505E+01 3.3977E+02 -1.3008E+03 3.2574E+03 -5.0893E+03 4.5097E+03 -1.7398E+03
S8 -3.3858E-01 -2.5312E-01 3.8643E+00 -2.2263E+01 8.2396E+01 -1.9467E+02 2.8170E+02 -2.2379E+02 7.3703E+01
S9 1.8386E-01 -1.6820E-02 -1.5798E+00 7.6330E+00 -1.9097E+01 2.7855E+01 -2.3782E+01 1.1033E+01 -2.1490E+00
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 1.5872E-01 -1.0491E+00 3.8757E+00 -9.0092E+00 1.3408E+01 -1.3099E+01 8.4428E+00 -3.3379E+00 6.0953E-01
S12 3.9772E-01 -8.1546E-01 1.8907E+00 -1.7710E+00 -1.3152E+00 4.7866E+00 -4.6595E+00 2.0767E+00 -3.6437E-01
S13 -1.0355E+00 1.0128E+00 5.9390E-02 -2.1654E+00 3.0167E+00 -1.8127E+00 3.5806E-01 1.1068E-01 -4.6420E-02
S14 -6.2488E-01 1.1819E+00 -1.6109E+00 1.5080E+00 -9.6949E-01 4.1985E-01 -1.1678E-01 1.8780E-02 -1.3200E-03
TABLE 5
Table 6 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 2, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
f1(mm) -8.15 f6(mm) 1.96
f2(mm) -33.01 f7(mm) -1.90
f3(mm) 2.18 f(mm) 1.89
f4(mm) -9.08 TTL(mm) 4.95
f5(mm) 13.09 HFOV(°) 47.5
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 4B shows an astigmatism curve of the optical imaging system of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging system of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging system according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 7 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 3, in which the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 7
As is clear from table 7, in embodiment 3, the object side surface and the image side surface of any one of the first lens element E1 to the seventh lens element E7 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 2.4027E-01 -2.3297E-01 2.2663E-01 -1.8042E-01 1.0359E-01 -4.0810E-02 1.1223E-02 -2.1100E-03 2.0600E-04
S2 4.7045E-02 -1.4604E-01 2.3363E-01 -2.7878E-01 2.5909E-01 -1.6761E-01 6.7871E-02 -1.5400E-02 1.5080E-03
S3 -1.2232E-01 3.2414E-01 1.4441E-01 -1.9673E+00 4.2673E+00 -4.8183E+00 3.0821E+00 -1.0571E+00 1.5182E-01
S4 1.9746E-01 3.6071E-01 -7.8605E-01 3.7499E+00 -1.7256E+01 4.5033E+01 -6.4728E+01 4.7353E+01 -1.3692E+01
S5 5.8200E-03 2.1597E+00 -6.1452E+01 8.6704E+02 -7.6382E+03 4.2020E+04 -1.4051E+05 2.6082E+05 -2.0605E+05
S6 -9.3382E-01 1.1594E+01 -1.0557E+02 6.6277E+02 -2.7613E+03 7.2325E+03 -1.0945E+04 7.9251E+03 -1.4127E+03
S7 -9.2838E-01 8.0349E+00 -7.1293E+01 4.3459E+02 -1.7740E+03 4.7186E+03 -7.7626E+03 7.1281E+03 -2.7769E+03
S8 -3.7942E-01 -4.6970E-02 3.2427E+00 -2.2226E+01 9.2972E+01 -2.4970E+02 4.2204E+02 -4.0379E+02 1.6575E+02
S9 1.6074E-01 7.0818E-02 -2.1857E+00 1.1336E+01 -3.2418E+01 5.5104E+01 -5.6295E+01 3.2779E+01 -8.6010E+00
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 1.7349E-01 -1.1272E+00 4.9609E+00 -1.4910E+01 3.0464E+01 -4.3148E+01 4.0912E+01 -2.2933E+01 5.6149E+00
S12 4.5212E-01 -1.2122E+00 4.5136E+00 -1.1894E+01 2.2023E+01 -2.8445E+01 2.3908E+01 -1.1444E+01 2.3300E+00
S13 -1.0291E+00 8.9310E-01 8.5221E-01 -5.1287E+00 9.2390E+00 -9.4188E+00 5.7253E+00 -1.9114E+00 2.6798E-01
S14 -6.3449E-01 1.2146E+00 -1.7185E+00 1.6941E+00 -1.1528E+00 5.2733E-01 -1.5421E-01 2.5963E-02 -1.9100E-03
TABLE 8
Table 9 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 3, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
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TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 6B shows an astigmatism curve of the optical imaging system of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging system of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. Fig. 6D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging system according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave 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 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 10 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 4, in which 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 seventh lens element E7 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 f7 of the respective lenses in embodiment 4, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
f1(mm) -8.39 f6(mm) 1.91
f2(mm) -65.93 f7(mm) -1.87
f3(mm) 2.16 f(mm) 1.89
f4(mm) -8.68 TTL(mm) 4.95
f5(mm) 13.46 HFOV(°) 47.0
Table 12
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the optical imaging system of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging system of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. Fig. 8D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the optical imaging system according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has negative 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 13 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 5, in which the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 13
As is clear 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 seventh lens element E7 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 2.3188E-01 -1.9838E-01 1.6217E-01 -1.0504E-01 4.1231E-02 -2.7600E-03 -4.5800E-03 1.6830E-03 -1.8000E-04
S2 2.6869E-02 -6.7110E-02 8.7992E-02 -1.2784E-01 1.7909E-01 -1.5613E-01 7.5694E-02 -1.9050E-02 1.9640E-03
S3 -6.3370E-02 -1.0517E-01 1.5426E+00 -4.8129E+00 8.3615E+00 -8.9136E+00 5.7032E+00 -2.0069E+00 2.9968E-01
S4 2.1972E-01 -1.7502E-01 1.7735E+00 -4.6146E+00 4.2855E+00 5.5657E+00 -1.7769E+01 1.4813E+01 -3.7692E+00
S5 -9.2700E-03 3.3266E+00 -8.9566E+01 1.2731E+03 -1.1208E+04 6.1440E+04 -2.0451E+05 3.7799E+05 -2.9756E+05
S6 -9.6499E-01 1.4079E+01 -1.3176E+02 8.2599E+02 -3.4858E+03 9.5755E+03 -1.6158E+04 1.4846E+04 -5.4507E+03
S7 -1.0591E+00 1.1172E+01 -9.9249E+01 5.8966E+02 -2.3469E+03 6.1198E+03 -9.9547E+03 9.1417E+03 -3.6209E+03
S8 -5.2889E-01 1.1981E+00 -2.6882E+00 -3.8379E+00 5.3620E+01 -1.8552E+02 3.3017E+02 -3.0138E+02 1.1038E+02
S9 6.7489E-02 1.9231E-01 -1.4388E+00 5.4048E+00 -1.2732E+01 1.7878E+01 -1.4365E+01 6.0946E+00 -1.0591E+00
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 2.4055E-01 -1.0797E+00 3.6250E+00 -8.8478E+00 1.4362E+01 -1.5778E+01 1.1455E+01 -4.7110E+00 7.3793E-01
S12 6.4694E-01 -1.8996E+00 5.7095E+00 -1.2257E+01 1.8319E+01 -1.9094E+01 1.3226E+01 -5.3331E+00 9.2450E-01
S13 -9.6433E-01 5.6077E-01 1.4284E+00 -5.2023E+00 7.7752E+00 -6.7541E+00 3.5494E+00 -1.0388E+00 1.2879E-01
S14 -6.2520E-01 1.1342E+00 -1.5098E+00 1.3865E+00 -8.7583E-01 3.7199E-01 -1.0106E-01 1.5779E-02 -1.0700E-03
TABLE 14
Table 15 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 5, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
f1(mm) -7.98 f6(mm) 1.85
f2(mm) -72.73 f7(mm) -1.79
f3(mm) 2.17 f(mm) 1.88
f4(mm) -7.24 TTL(mm) 4.92
f5(mm) 8.26 HFOV(°) 46.7
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 5, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the optical imaging system of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging system of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. Fig. 10D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging system according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 16 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 6, in which the radii of curvature and thicknesses are each in millimeters (mm).
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Table 16
As is clear 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 seventh lens element E7 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.4782E-01 -2.4498E-01 2.3568E-01 -1.9045E-01 1.1696E-01 -5.0080E-02 1.4023E-02 -2.3100E-03 1.7200E-04
S2 3.2974E-02 1.8954E-02 -3.3568E-01 7.1738E-01 -7.6271E-01 4.7429E-01 -1.7574E-01 3.6097E-02 -3.1700E-03
S3 -1.8902E-01 5.3499E-01 9.7843E-02 -3.4400E+00 9.0017E+00 -1.1818E+01 8.6223E+00 -3.3349E+00 5.3585E-01
S4 1.1463E-01 4.6816E-01 -2.4350E-01 1.0724E+00 -1.3487E+01 4.9737E+01 -8.2473E+01 6.3391E+01 -1.8370E+01
S5 -3.6850E-02 -1.5802E+00 2.6950E+01 -4.0589E+02 3.5776E+03 -1.9288E+04 6.1774E+04 -1.0807E+05 7.9302E+04
S6 -7.7624E-01 9.3912E+00 -6.8412E+01 2.7392E+02 -1.8327E+02 -3.5469E+03 1.6737E+04 -3.1994E+04 2.3391E+04
S7 -1.0498E+00 7.9059E+00 -6.2713E+01 3.5504E+02 -1.3617E+03 3.4766E+03 -5.6673E+03 5.4029E+03 -2.3288E+03
S8 -4.1924E-01 2.2121E-01 7.3359E-01 -1.6286E+00 -8.9980E+00 6.9365E+01 -2.0106E+02 2.8817E+02 -1.6566E+02
S9 1.3514E-01 1.2093E-01 -3.0459E+00 1.9129E+01 -6.6891E+01 1.4278E+02 -1.8681E+02 1.3878E+02 -4.4932E+01
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 2.0824E-01 -9.1058E-01 3.7597E+00 -1.1490E+01 2.3188E+01 -3.1844E+01 2.9008E+01 -1.5436E+01 3.5383E+00
S12 5.6949E-01 -1.2951E+00 3.6483E+00 -7.7230E+00 1.1323E+01 -1.1681E+01 8.0841E+00 -3.2001E+00 5.1925E-01
S13 -1.0815E+00 1.3086E+00 -1.0525E+00 -4.4908E-01 2.0723E+00 -2.3713E+00 1.4435E+00 -4.5705E-01 5.7207E-02
S14 -5.9881E-01 1.1455E+00 -1.7000E+00 1.7808E+00 -1.2916E+00 6.2950E-01 -1.9585E-01 3.5022E-02 -2.7300E-03
TABLE 17
Table 18 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 6, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
f1(mm) -7.46 f6(mm) 1.83
f2(mm) 91.30 f7(mm) -1.75
f3(mm) 2.22 f(mm) 1.87
f4(mm) -8.21 TTL(mm) 4.96
f5(mm) 9.07 HFOV(°) 45.9
TABLE 18
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the optical imaging system of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging system of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging system according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has negative 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 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 convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 19 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 7, in which the radii of curvature and thicknesses are each in millimeters (mm).
TABLE 19
As is clear 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 seventh lens element E7 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 2.3661E-01 -2.0345E-01 1.5226E-01 -7.9380E-02 1.4550E-02 1.3265E-02 -1.0410E-02 2.9050E-03 -3.0000E-04
S2 2.7502E-02 -5.8630E-02 4.8450E-02 -4.7600E-02 8.4706E-02 -8.4100E-02 4.0880E-02 -9.4700E-03 8.3000E-04
S3 -1.5638E-01 2.0605E-02 2.3702E+00 -8.6830E+00 1.6515E+01 -1.8820E+01 1.2726E+01 -4.6952E+00 7.2847E-01
S4 1.7553E-01 -7.8970E-02 2.5232E+00 -5.7835E+00 -5.4124E+00 5.2849E+01 -1.0628E+02 9.0943E+01 -2.8710E+01
S5 4.2866E-02 1.7011E+00 -4.7270E+01 6.3312E+02 -5.2917E+03 2.7597E+04 -8.7639E+04 1.5479E+05 -1.1670E+05
S6 -1.0896E+00 1.3431E+01 -9.0578E+01 2.5478E+02 7.8706E+02 -9.4930E+03 3.4501E+04 -5.9172E+04 4.0358E+04
S7 -1.1903E+00 1.1682E+01 -9.5403E+01 5.2139E+02 -1.8947E+03 4.5058E+03 -6.7066E+03 5.6766E+03 -2.0991E+03
S8 -5.8093E-01 9.4483E-01 1.6402E+00 -3.6042E+01 1.9799E+02 -5.7426E+02 9.4621E+02 -8.2981E+02 2.9882E+02
S9 1.2309E-01 3.8331E-01 -2.5147E+00 8.4399E+00 -1.8978E+01 2.7322E+01 -2.3873E+01 1.1495E+01 -2.3319E+00
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 2.6030E-01 -1.0733E+00 2.9602E+00 -6.2361E+00 8.8013E+00 -7.6591E+00 3.9155E+00 -1.0807E+00 1.2460E-01
S12 5.9688E-01 -1.3727E+00 3.3750E+00 -5.3554E+00 4.3120E+00 -5.7979E-01 -1.5990E+00 1.0954E+00 -2.2596E-01
S13 -1.1016E+00 8.0734E-01 5.7058E-01 -2.4924E+00 2.4522E+00 -4.7275E-01 -7.6904E-01 5.6184E-01 -1.2015E-01
S14 -7.0291E-01 1.2685E+00 -1.6823E+00 1.5631E+00 -1.0136E+00 4.4774E-01 -1.2796E-01 2.1242E-02 -1.5500E-03
Table 20
Table 21 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 7, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
Table 21
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the optical imaging system of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the optical imaging system of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging system according to embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application.
As shown in fig. 15, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 22 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 8, in which 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 seventh lens element E7 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 the effective focal lengths f1 to f7 of the respective lenses in embodiment 8, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
f1(mm) -7.71 f6(mm) 1.60
f2(mm) 1976.39 f7(mm) -1.64
f3(mm) 2.03 f(mm) 1.85
f4(mm) -10.21 TTL(mm) 4.95
f5(mm) -1132.83 HFOV(°) 45.2
Table 24
Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 8, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve of the optical imaging system of embodiment 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the optical imaging system of embodiment 8, which represents distortion magnitude values corresponding to different angles of view. Fig. 16D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 8, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 16A to 16D, the optical imaging system according to embodiment 8 can achieve good imaging quality.
Example 9
An optical imaging system according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an optical imaging system according to embodiment 9 of the present application.
As shown in fig. 17, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has negative 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 positive 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 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 negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 25 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging system of example 9, in which 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 seventh lens element E7 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 2.5386E-01 -2.4898E-01 2.3901E-01 -1.9477E-01 1.1742E-01 -4.6030E-02 1.0921E-02 -1.4600E-03 9.4700E-05
S2 4.2131E-02 1.7001E-02 -4.3498E-01 9.3910E-01 -9.8117E-01 5.9547E-01 -2.1622E-01 4.3927E-02 -3.8400E-03
S3 -2.0007E-01 7.6422E-01 -8.9461E-01 -1.4214E+00 6.9282E+00 -1.1063E+01 9.0125E+00 -3.7537E+00 6.3664E-01
S4 1.4375E-01 8.0836E-01 -1.9876E+00 7.7417E+00 -3.6183E+01 1.1141E+02 -1.8858E+02 1.5764E+02 -5.0350E+01
S5 9.2889E-02 -2.2941E+00 5.7143E+01 -8.6923E+02 7.7283E+03 -4.1681E+04 1.3384E+05 -2.3565E+05 1.7514E+05
S6 -1.7741E+00 1.4967E+01 -8.6312E+01 3.6538E+02 -1.1254E+03 2.2923E+03 -2.6258E+03 1.1004E+03 2.7990E+02
S7 -7.7270E-01 4.8648E-01 2.2652E+01 -2.0350E+02 9.6929E+02 -2.9524E+03 5.6894E+03 -6.2445E+03 2.9511E+03
S8 2.5281E-01 -8.1773E+00 5.8238E+01 -2.6503E+02 8.5840E+02 -1.9679E+03 2.9775E+03 -2.6099E+03 9.9099E+02
S9 7.2617E-01 -3.7285E+00 1.2946E+01 -4.0496E+01 1.5932E+02 -5.1251E+02 9.7738E+02 -9.6752E+02 3.8654E+02
S10 3.5420E-03 3.9306E-02 -2.6497E-01 3.2706E-01 8.6074E-01 -2.8954E+00 3.3950E+00 -1.8715E+00 4.0985E-01
S11 1.3263E-01 -1.3467E+00 6.7875E+00 -1.9743E+01 3.8110E+01 -5.3915E+01 5.5018E+01 -3.4507E+01 9.4642E+00
S12 4.8813E-01 -1.4055E+00 5.0591E+00 -1.2846E+01 2.4489E+01 -3.4955E+01 3.3292E+01 -1.7906E+01 4.0259E+00
S13 -1.0968E+00 1.2363E+00 -7.3490E-02 -2.8816E+00 4.9842E+00 -4.3512E+00 2.2621E+00 -6.7034E-01 8.7263E-02
S14 -6.2057E-01 1.1810E+00 -1.6010E+00 1.4733E+00 -9.2489E-01 3.8916E-01 -1.0478E-01 1.6268E-02 -1.1000E-03
Table 26
Table 27 shows the effective focal lengths f1 to f7 of the respective lenses in embodiment 9, the total effective focal length f of the optical imaging system, the total optical length TTL, and the maximum half field angle HFOV.
f1(mm) -7.46 f6(mm) 1.77
f2(mm) -93.94 f7(mm) -1.71
f3(mm) 2.41 f(mm) 1.85
f4(mm) 1008.45 TTL(mm) 4.95
f5(mm) 27.21 HFOV(°) 45.1
Table 27
Fig. 18A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 9, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve of the optical imaging system of embodiment 9, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 18C shows a distortion curve of the optical imaging system of embodiment 9, which represents distortion magnitude values corresponding to different angles of view. Fig. 18D shows a magnification chromatic aberration curve of the optical imaging system of embodiment 9, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 18A to 18D, the optical imaging system as set forth in embodiment 9 can achieve good imaging quality.
In summary, examples 1 to 9 each satisfy the relationship shown in table 28.
Table 28
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 system 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 (12)

1. The optical imaging system 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 and a seventh lens, characterized in that,
The first lens, the second lens and the seventh lens each have negative optical power;
the fourth lens and the fifth lens have positive focal power or negative focal power;
the third lens and the sixth lens each have positive optical power;
the object side surface of the first lens is a concave surface;
the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens meet the condition that R10/R12 is less than or equal to 5.08 and less than 6.5;
the maximum half field angle HFOV of the optical imaging system satisfies 45 DEG < HFOV < 55 DEG; and
the number of lenses having optical power in the optical imaging system is seven.
2. The optical imaging system of claim 1, wherein an image side of the third lens is convex; the effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy-2 < f3/R6 < -1.
3. The optical imaging system according to claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy 1 < R7/R8 < 2.
4. The optical imaging system according to claim 1, wherein a radius of curvature R13 of an object side surface of the seventh lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy 2 < R13/R14 < 3.
5. The optical imaging system of claim 1, wherein a total effective focal length f of the optical imaging system and an effective focal length f2 of the second lens satisfy |f/f2| < 0.1.
6. The optical imaging system of claim 1, wherein an effective focal length f1 of the first lens and a total effective focal length f of the optical imaging system satisfy-7.5 < f1/f < -3.5.
7. The optical imaging system of claim 1, wherein an effective focal length f6 of the sixth lens and an effective focal length f7 of the seventh lens satisfy-1.5 < f6/f7 < -0.5.
8. The optical imaging system of claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy 1 < CT1/CT2 < 2.
9. The optical imaging system of claim 1, wherein a separation distance T23 of the second lens and the third lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy 1 < T23/CT3 < 2.5.
10. The optical imaging system of claim 1, wherein a maximum effective radius DT11 of the object-side surface of the first lens and a maximum effective radius DT71 of the object-side surface of the seventh lens satisfy 1 < DT11/DT71 < 1.5.
11. The optical imaging system according to claim 9, wherein a separation distance T45 of the fourth lens and the fifth lens on the optical axis, a separation distance T56 of the fifth lens and the sixth lens on the optical axis, and a separation distance T67 of the sixth lens and the seventh lens on the optical axis satisfy 0.3 < T45/(t56+t67) < 1.8.
12. The optical imaging system according to any one of claims 1 to 11, wherein the maximum effective radius DT12 of the image side surface of the first lens and half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfy 0.6 < DT12/ImgH < 1.
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