CN108279484B - Optical imaging system - Google Patents

Optical imaging system Download PDF

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Publication number
CN108279484B
CN108279484B CN201810204941.5A CN201810204941A CN108279484B CN 108279484 B CN108279484 B CN 108279484B CN 201810204941 A CN201810204941 A CN 201810204941A CN 108279484 B CN108279484 B CN 108279484B
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Prior art keywords
lens
imaging system
optical imaging
optical
image
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CN201810204941.5A
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CN108279484A (en
Inventor
高雪
李明
闻人建科
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201810204941.5A priority Critical patent/CN108279484B/en
Publication of CN108279484A publication Critical patent/CN108279484A/en
Priority to PCT/CN2018/125311 priority patent/WO2019174364A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
    • 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

Abstract

The application discloses an optical imaging system, this optical imaging system includes in order along the optical axis from the object side to the image side: 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 has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive optical power; the third lens has negative focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens, the fifth lens and the sixth lens all have focal power; the seventh lens has optical power, wherein an object side surface of the seventh lens is a convex surface, and an image side surface of the seventh lens is a concave surface. Half of the HFOV's maximum field of view of the optical imaging system satisfies HFOV's 45.0 degrees or more.

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 diversification of portable electronic products such as smartphones, consumers have increasingly demanded photographing functions attached to the portable electronic products. In order to meet the market demand, a lens suitable for a portable electronic product needs to have a larger field angle in addition to the characteristics of high pixels, high resolution, high relative brightness, and the like.
Therefore, there is a need for an optical imaging system that has ultra-thin, large field of view, excellent imaging quality, low sensitivity, and the like, and is adaptable to portable electronic products.
Disclosure of Invention
The present application provides an optical imaging system 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 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 element may have positive refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the second lens may have positive optical power; the third lens element may have negative refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the fourth lens, the fifth lens and the sixth lens all have focal power; the seventh lens element has an object-side surface being convex and an image-side surface being concave. Wherein, half of the HFOV of the maximum field angle of the optical imaging system satisfies HFOV 45.0 degrees or more.
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 2 < f1/f < 5.
In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging system may satisfy 1.5 < f2/f < 2.5.
In one embodiment, the effective focal length f3 of the third lens and the total effective focal length f of the optical imaging system may satisfy 2.1 < |f3/f| < 3.
In one embodiment, the total effective focal length f of the optical imaging system and the radius of curvature R14 of the image side of the seventh lens may satisfy 3.5 < f/R14 < 5.
In one embodiment, the total effective focal length f of the optical imaging system and the radius of curvature R5 of the object side of the third lens may satisfy 1 < f/R5 < 1.5.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy 0.5 < R1/R2 < 1.
In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy 1.0 < R5/R6 < 2.0.
In one embodiment, a distance TTL between a center of the object side surface of the first lens and an imaging surface of the optical imaging system on the optical axis and a half of a diagonal length ImgH of an effective pixel area on the imaging surface of the optical imaging system may satisfy TTL/ImgH < 1.7.
In one embodiment, the total effective focal length f of the optical imaging system, the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system may satisfy 4.5 < f×ttl/ImgH < 5.5.
In one embodiment, the sum Σct of the total effective focal length f of the optical imaging system and the center thicknesses of the first lens element to the seventh lens element on the optical axis may satisfy 0.5 < f/Σct < 1.5.
In one embodiment, the center thickness CT2 of the second lens on the optical axis and the distance T23 between the second lens and the third lens on the optical axis can satisfy 10 < CT2/T23 < 12.
In one embodiment, the interval distance T67 between the sixth lens element and the seventh lens element on the optical axis, the center thickness CT6 of the sixth lens element on the optical axis, and the center thickness CT7 of the seventh lens element on the optical axis may satisfy 0 < T67/(CT 6+ct 7) < 0.5.
In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f/EPD < 1.8.
In another 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 element may have positive refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the second lens may have positive optical power; the third lens element may have negative refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the fourth lens, the fifth lens and the sixth lens all have focal power; the seventh lens element has an object-side surface being convex and an image-side surface being concave. The center thickness CT2 of the second lens on the optical axis and the interval distance T23 of the second lens and the third lens on the optical axis can satisfy the condition that CT2/T23 is smaller than 12.
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 element may have positive refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the second lens may have positive optical power; the third lens element may have negative refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the fourth lens, the fifth lens and the sixth lens all have focal power; the seventh lens element has an object-side surface being convex and an image-side surface being concave. The total effective focal length f of the optical imaging system and the curvature radius R5 of the object side surface of the third lens can satisfy 1 < f/R5 < 1.5.
The optical imaging system has at least one beneficial effect of ultra-thin, miniaturized, large field angle, high imaging quality and the like by reasonably distributing the focal power, the surface thickness of each lens, the axial spacing between each lens and the like of a plurality of (e.g., seven) lenses.
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 structural view 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 structural view 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 structural view 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 structural view 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.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are 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 surface, and the surface of each lens closest to the imaging surface is referred to as the image side surface.
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 present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction 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 arranged in sequence from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have positive optical power, an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the second lens may have positive optical power; the third lens element may have negative refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be concave; 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 has positive optical power or negative optical power; the seventh lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The focal power and the surface shape of each lens are reasonably configured, so that the total length of the system can be effectively shortened.
In an exemplary embodiment, at least one of the object side surface and the image side surface of the second lens may be convex. Optionally, the object side surface of the second lens is convex.
In an exemplary embodiment, the fourth lens may have positive optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave.
In an exemplary embodiment, at least one of the object side surface and the image side surface of the fifth lens may be concave. Optionally, the object side surface of the fifth lens is a concave surface.
In an exemplary embodiment, at least one of the object side surface and the image side surface of the sixth lens may be convex. Optionally, the object side surface of the sixth lens is a convex surface.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression HFOV 45.0, where HFOV is half the maximum field angle of the optical imaging system. More specifically, HFOV's further may satisfy 45.0 and 45.2. The wide-angle optical imaging system has a larger field angle, can effectively enlarge the shooting range of the optical imaging system, and ensures the wide-angle characteristic of the optical imaging system.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 2 < f1/f < 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, f1 and f may further satisfy 2.5 < f1/f < 4.5, for example, 3.01.ltoreq.f1/f.ltoreq.4.10. The total effective focal length of the optical imaging system and the effective focal length of the first lens are reasonably distributed, so that light deflection can be effectively controlled, and sensitivity is reduced; meanwhile, spherical aberration, astigmatism and the like of the system can be reduced, so that the imaging quality of the optical imaging system is effectively improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < f2/f < 2.5, where f2 is an effective focal length of the second lens, and f is a total effective focal length of the optical imaging system. More specifically, f2 and f may further satisfy 1.7 < f2/f < 2.1, for example, 1.73.ltoreq.f2/f.ltoreq.2.01. The total effective focal length of the whole optical imaging system and the effective focal length of the second lens are reasonably distributed, so that spherical aberration, coma aberration, astigmatism and distortion of the system can be effectively balanced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.1 < |f3/f| < 3, where f3 is an effective focal length of the third lens and f is a total effective focal length of the optical imaging system. More specifically, f3 and f may further satisfy 2.3 < |f3/f| < 2.9, for example, 2.39|f3/f|| < 2.87. The total effective focal length of the whole optical imaging system and the effective focal length of the third lens are reasonably distributed, so that the field curvature, on-axis chromatic aberration, astigmatism and distortion of the system can be effectively balanced, and the resolving power of the imaging system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 3.5 < f/R14 < 5, where f is the total effective focal length of the optical imaging system and R14 is the radius of curvature of the image side surface of the seventh lens. More specifically, f and R14 may further satisfy 3.7 < f/R14 < 4.8, for example, 3.73.ltoreq.f/R14.ltoreq.4.76. The total effective focal length of the optical imaging system and the curvature radius of the image side surface of the seventh lens are reasonably controlled, so that astigmatism and distortion of the optical imaging system can be reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition of 1 < f/R5 < 1.5, where f is the total effective focal length of the optical imaging system, and R5 is the radius of curvature of the object side surface of the third lens. More specifically, f and R5 may further satisfy 1.1 < f/R5 < 1.4, for example, 1.17.ltoreq.f/R5.ltoreq.1.32. The total effective focal length of the optical imaging system and the curvature radius of the image side surface of the third lens are reasonably controlled, so that astigmatism and distortion of the optical imaging system can be reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < R1/R2 < 1, where R1 is a radius of curvature of an object side surface of the first lens, and R2 is a radius of curvature of an image side surface of the first lens. More specifically, R1 and R2 may further satisfy 0.6 < R1/R2 < 0.8, for example, 0.69.ltoreq.R1/R2.ltoreq.0.79. The curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens are reasonably controlled, so that the deflection capability of light rays can be reduced, the relative illuminance of an optical imaging system can be effectively improved, and the sensitivity of the system is reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition that TTL/ImgH < 1.7, where TTL is a distance between a center of an object side surface of the first lens and an imaging surface of the optical imaging system 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 system. More specifically, TTL and ImgH can further satisfy TTL/ImgH < 1.5, e.g., 1.45.ltoreq.TTL/ImgH.ltoreq.1.49. The conditional TTL/ImgH is smaller than 1.7, the size of the optical imaging system can be effectively compressed, and the compact size characteristic of the imaging system is ensured.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 10 < CT2/T23 < 12, where CT2 is the center thickness of the second lens on the optical axis, and T23 is the separation distance of the second lens and the third lens on the optical axis. More specifically, CT2 and T23 may further satisfy 10 < CT2/T23 < 11.1, e.g., 10.14. Ltoreq.CT 2/T23. Ltoreq.11.00. The ratio of the center thickness of the second lens to the air space of the second lens and the third lens on the optical axis is reasonably controlled, so that the light deflection tends to be relaxed, the sensitivity of the system is reduced, and the front section size of the system is controlled.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < f/Σct < 1.5, where f is the total effective focal length of the optical imaging system, Σct is the sum of the central thicknesses of the first lens to the seventh lens on the optical axis, respectively. More specifically, f and ΣCT may further satisfy 1.20 < f/ΣCT < 1.35, for example, 1.25. Ltoreq.f/ΣCT. Ltoreq.1.30. Satisfies the condition that f/sigma CT is smaller than 0.5 and smaller than 1.5, and is favorable for ensuring miniaturization of the lens. By reasonably distributing the center thickness of each lens, the deflection of light rays tends to be relaxed, and the sensitivity of the system is reduced; meanwhile, astigmatism, distortion and chromatic aberration of the optical imaging system are reduced, and resolving power is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.0 < R5/R6 < 2.0, where R5 is a radius of curvature of an object side surface of the third lens and R6 is a radius of curvature of an image side surface of the third lens. More specifically, R5 and R6 may further satisfy 1.4 < R5/R6 < 1.6, for example, 1.47.ltoreq.R5/R6.ltoreq.1.55. And the curvature radiuses of the object side surface and the image side surface of the third lens are reasonably distributed, so that the optical imaging 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 0 < T67/(CT 6+ct 7) < 0.5, where T67 is a distance between the sixth lens and the seventh lens on the optical axis, CT6 is a center thickness of the sixth lens on the optical axis, and CT7 is a center thickness of the seventh lens on the optical axis. More specifically, T67, CT6 and CT7 may further satisfy 0 < T67/(CT6+CT7) < 0.2, for example, 0.10.ltoreq.T67/(CT6+CT7). Ltoreq.0.17. The center thicknesses of the sixth lens and the seventh lens and the air gap between the sixth lens and the seventh lens are reasonably distributed, so that astigmatism and distortion of the optical imaging system can be improved, imaging quality can be improved, and the rear section size of the optical imaging system can be reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition f/EPD < 1.8, where f is the total effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system. More specifically, f and EPD may further satisfy f/EPD < 1.6, e.g., f/epd=1.55. Satisfies the condition f/EPD < 1.8, has a large aperture, can enhance the imaging effect in the environment with weaker light, improves the relative illumination of the edge view field, and improves the imaging quality.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition that f is less than f×ttl/ImgH is less than 5.5, where f is a total effective focal length of the optical imaging system, TTL is a distance between a center of an object side surface of the first lens and an imaging surface of the optical imaging system 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 system. More specifically, f, TTL and ImgH may further satisfy 4.9 < f TTL/ImgH < 5.4, e.g., 4.99.ltoreq.f TTL/ImgH.ltoreq.5.34. The ratio of the product of the total effective focal length of the optical imaging system and the total optical length of the optical imaging system to the maximum image height of the optical imaging system is reasonably controlled, so that the ultra-thin performance and the wide-angle performance of the optical imaging system can be effectively ensured.
In an exemplary embodiment, the optical imaging system may further include at least one diaphragm to enhance the imaging quality of the imaging system. Alternatively, a diaphragm may be provided between the object side and the first lens.
Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.
The optical imaging system according to the above-described embodiments 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 system can be effectively reduced, the sensitivity of the system can be reduced, and the workability of the system can be improved, so that the optical imaging system is more beneficial to production and processing and is applicable to portable electronic products. In addition, by the optical imaging system configured as described above, it is possible to have advantageous effects such as ultra-thin, large angle of view, low sensitivity, 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. 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 may be varied to achieve the various results and advantages described in this specification without departing from the technical solutions claimed herein. 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, along an optical axis from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 convex, and an image-side surface S6 thereof is concave. 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 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 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 。
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 center of the object side surface S1 of the first lens E1 to the imaging surface S17), and half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 10.97 f6(mm) 5.40
f2(mm) 6.98 f7(mm) -20.42
f3(mm) -8.50 f(mm) 3.46
f4(mm) 35.17 TTL(mm) 5.22
f5(mm) 327.56 ImgH(mm) 3.50
TABLE 3 Table 3
The optical imaging system in embodiment 1 satisfies:
HFOV = 45.2 °, wherein HFOV is half of the maximum field angle of the optical imaging system;
f1/f=3.17, 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;
f2/f=2.01, where f2 is the effective focal length of the second lens E2, and f is the total effective focal length of the optical imaging system;
i f3/f i=2.45, where f3 is the effective focal length of the third lens E3, and f is the total effective focal length of the optical imaging system;
fr14=4.44, where f is the total effective focal length of the optical imaging system, R14 is the radius of curvature of the image side S14 of the seventh lens E7;
fr5=1.17, where f is the total effective focal length of the optical imaging system, and R5 is the radius of curvature of the object-side surface S5 of the third lens E3;
r1/r2=0.69, wherein R1 is a radius of curvature of the object-side surface S1 of the first lens element E1, and R2 is a radius of curvature of the image-side surface S2 of the first lens element E1;
TTL/imgh=1.49, where TTL is the distance between the center of the object side surface S1 of the first lens E1 and the imaging surface S17 on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface S17;
CT 2/t23=10.37, where CT2 is the center thickness of the second lens E2 on the optical axis, and T23 is the separation distance between the second lens E2 and the third lens E3 on the optical axis;
f/Σct=1.25, where f is the total effective focal length of the optical imaging system, Σct is the sum of the center thicknesses of the first lens E1 to the seventh lens E7 on the optical axis, respectively;
r5/r6=1.55, where R5 is a radius of curvature of the object-side surface S5 of the third lens element E3, and R6 is a radius of curvature of the image-side surface S6 of the third lens element E3;
T67/(CT 6+ct 7) =0.11, where T67 is the distance between the sixth lens element E6 and the seventh lens element E7 on the optical axis, CT6 is the center thickness of the sixth lens element E6 on the optical axis, and CT7 is the center thickness of the seventh lens element E7 on the optical axis;
f/EPD = 1.55, where f is the total effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging system;
TTL/imgh=5.17, where f is the total effective focal length of the optical imaging system, TTL is the distance between the center of the object side surface S1 of the first lens element E1 and the imaging surface S17 on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface S17.
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 of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. 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 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 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 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 4.9826E-02 -2.1260E-01 1.0896E+00 -3.3849E+00 6.5475E+00 -7.9055E+00 5.7728E+00 -2.3261E+00 3.9620E-01
S2 9.0310E-02 -5.6426E-01 2.6947E+00 -8.3528E+00 1.6233E+01 -1.9732E+01 1.4556E+01 -5.9512E+00 1.0326E+00
S3 -4.9787E-02 -8.6610E-02 5.4227E-01 -2.1194E+00 4.8490E+00 -6.5881E+00 5.2753E+00 -2.3002E+00 4.2015E-01
S4 -6.6415E-02 2.5223E-01 -5.3836E-01 2.8972E-01 8.8951E-01 -2.0225E+00 1.8774E+00 -8.5934E-01 1.5835E-01
S5 1.4501E-02 1.1866E-01 -3.9158E-01 5.1930E-01 -3.6853E-01 1.0292E-01 3.5325E-02 -3.3080E-02 6.8557E-03
S6 1.4278E-02 5.1462E-02 -1.1090E-01 5.9034E-02 4.9123E-02 -9.6734E-02 6.5369E-02 -2.1198E-02 2.7515E-03
S7 -5.9641E-02 1.2059E-01 -3.8085E-01 7.4167E-01 -8.8860E-01 6.6345E-01 -3.0065E-01 7.5551E-02 -8.0807E-03
S8 -4.8414E-02 4.6816E-02 -7.2679E-02 2.8786E-05 9.6787E-02 -1.1267E-01 6.0505E-02 -1.6209E-02 1.7475E-03
S9 -6.4214E-02 2.0909E-01 -2.6663E-01 1.8584E-01 -7.8180E-02 1.9196E-02 -2.3719E-03 6.9491E-05 8.0286E-06
S10 -2.4590E-01 3.5415E-01 -3.7695E-01 2.6306E-01 -1.2000E-01 3.5875E-02 -6.7420E-03 7.1690E-04 -3.2706E-05
S11 8.1928E-02 -6.1479E-02 1.6514E-02 -8.7923E-03 4.1420E-03 -1.0360E-03 1.3989E-04 -9.8417E-06 2.8513E-07
S12 2.0863E-01 -9.5843E-02 4.5061E-03 6.7244E-03 -1.9697E-03 2.0693E-04 -1.7885E-06 -1.1578E-06 5.9942E-08
S13 -6.0595E-02 -9.6206E-02 7.6298E-02 -2.5011E-02 4.6222E-03 -5.1788E-04 3.4985E-05 -1.3143E-06 2.1126E-08
S14 -9.3809E-02 4.3728E-03 7.5497E-03 -2.2507E-03 2.8205E-04 -1.6126E-05 1.6908E-07 2.2349E-08 -7.3190E-10
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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 12.32 f6(mm) 5.22
f2(mm) 6.44 f7(mm) -19.96
f3(mm) -8.29 f(mm) 3.47
f4(mm) 28.71 TTL(mm) 5.22
f5(mm) -74.3 ImgH(mm) 3.50
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 of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 4A to 4D, the optical imaging system according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 convex, and an image-side surface S6 thereof is concave. 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 convex and an image-side surface S12 thereof is concave. 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).
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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 2.8790E-02 1.5890E-02 -1.2147E-01 3.8322E-01 -6.7037E-01 6.8896E-01 -4.1236E-01 1.3252E-01 -1.7618E-02
S2 8.4723E-02 -2.1494E-01 4.0876E-01 -7.1975E-01 1.0105E+00 -1.0397E+00 7.1846E-01 -2.8946E-01 5.0169E-02
S3 -4.1068E-02 -3.2006E-02 7.5100E-02 -4.6636E-01 1.2265E+00 -1.6583E+00 1.2574E+00 -5.0736E-01 8.4375E-02
S4 -2.5133E-02 1.1121E-01 -3.8488E-01 6.1581E-01 -6.9055E-01 6.9245E-01 -5.4623E-01 2.5338E-01 -4.8669E-02
S5 4.0167E-02 -2.6742E-03 -1.1963E-01 1.9622E-01 -2.4989E-01 3.0286E-01 -2.6646E-01 1.2726E-01 -2.3941E-02
S6 2.1507E-02 3.0306E-02 -7.2030E-02 8.3874E-03 9.6466E-02 -1.2460E-01 7.1170E-02 -1.9332E-02 2.0009E-03
S7 -6.0328E-02 1.3022E-01 -3.9213E-01 7.3005E-01 -8.5613E-01 6.3395E-01 -2.8751E-01 7.2955E-02 -7.9492E-03
S8 -7.0147E-02 9.0384E-02 -1.5615E-01 1.2169E-01 -3.3571E-02 -1.9093E-02 1.8566E-02 -5.7022E-03 6.3430E-04
S9 -1.3588E-01 3.5532E-01 -4.4934E-01 3.3283E-01 -1.5569E-01 4.6274E-02 -8.4964E-03 8.8397E-04 -4.0055E-05
S10 -3.1677E-01 5.1110E-01 -5.5811E-01 3.7814E-01 -1.5967E-01 4.2513E-02 -6.9671E-03 6.4311E-04 -2.5618E-05
S11 8.7959E-02 -2.6518E-02 -4.1880E-02 2.6419E-02 -7.1171E-03 1.0893E-03 -9.9589E-05 5.1267E-06 -1.1533E-07
S12 2.4354E-01 -1.0620E-01 -1.8017E-02 2.7754E-02 -1.0079E-02 1.8984E-03 -2.0126E-04 1.1382E-05 -2.6753E-07
S13 -6.8380E-02 -1.0250E-01 8.5658E-02 -2.8655E-02 5.2948E-03 -5.8412E-04 3.8417E-05 -1.3939E-06 2.1516E-08
S14 -1.8855E-01 8.8177E-02 -3.6778E-02 1.1910E-02 -2.4586E-03 3.0599E-04 -2.2272E-05 8.7441E-07 -1.4319E-08
TABLE 8
Table 9 gives 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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 14.20 f6(mm) 5.73
f2(mm) 6.00 f7(mm) -29.18
f3(mm) -8.38 f(mm) 3.47
f4(mm) 37.84 TTL(mm) 5.20
f5(mm) 339.79 ImgH(mm) 3.50
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 of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 6A to 6D, the optical imaging system according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 convex, and an image-side surface S6 thereof is concave. 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 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 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 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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 11.36 f6(mm) 5.28
f2(mm) 6.81 f7(mm) -21.86
f3(mm) -8.60 f(mm) 3.43
f4(mm) 35.76 TTL(mm) 5.16
f5(mm) -1000.05 ImgH(mm) 3.48
Table 12
Fig. 8A shows an on-axis chromatic aberration curve for the optical imaging system of embodiment 4, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 8A to 8D, the optical imaging system according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. 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 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 convex and an image-side surface S12 thereof is concave. 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 2.2644E-02 7.9301E-02 -3.5058E-01 8.7242E-01 -1.3394E+00 1.2799E+00 -7.3924E-01 2.3512E-01 -3.1471E-02
S2 4.9610E-02 -3.3084E-02 -3.4075E-01 1.5325E+00 -3.3019E+00 4.0569E+00 -2.8691E+00 1.0844E+00 -1.6937E-01
S3 -6.4367E-02 8.5187E-02 -3.3965E-01 6.2642E-01 -5.9004E-01 2.4276E-01 4.1982E-02 -7.7877E-02 2.0749E-02
S4 -1.9523E-02 -1.0280E-01 7.3628E-01 -2.5186E+00 4.7130E+00 -5.1179E+00 3.2405E+00 -1.1158E+00 1.6199E-01
S5 5.3278E-02 -8.7441E-02 1.5862E-01 -4.5678E-01 7.9405E-01 -7.5645E-01 3.8762E-01 -9.7159E-02 8.7280E-03
S6 4.0479E-02 -9.8469E-02 3.5630E-01 -8.9413E-01 1.3169E+00 -1.1623E+00 6.0675E-01 -1.7268E-01 2.0696E-02
S7 -1.3909E-02 -1.2144E-01 3.4221E-01 -6.0586E-01 6.9827E-01 -5.1719E-01 2.3701E-01 -6.1059E-02 6.7260E-03
S8 -5.0290E-02 6.4632E-02 -1.6264E-01 1.9817E-01 -1.5333E-01 7.5653E-02 -2.3120E-02 4.0262E-03 -3.0911E-04
S9 -9.3502E-02 3.0239E-01 -4.2674E-01 3.4784E-01 -1.8092E-01 6.0106E-02 -1.2278E-02 1.4024E-03 -6.8457E-05
S10 -2.5291E-01 3.9243E-01 -4.4599E-01 3.2435E-01 -1.4986E-01 4.4126E-02 -8.0010E-03 8.1074E-04 -3.5008E-05
S11 1.0504E-01 -7.6365E-02 6.0360E-03 4.5439E-03 -1.5588E-03 2.5617E-04 -2.6237E-05 1.6163E-06 -4.4786E-08
S12 2.6623E-01 -1.6076E-01 3.3789E-02 2.0305E-03 -2.6673E-03 6.0970E-04 -6.7809E-05 3.8009E-06 -8.5691E-08
S13 -2.8765E-02 -1.2683E-01 9.1184E-02 -2.8886E-02 5.1574E-03 -5.5281E-04 3.5335E-05 -1.2434E-06 1.8562E-08
S14 -1.2649E-01 3.7450E-02 -1.5051E-02 6.4640E-03 -1.6213E-03 2.2624E-04 -1.7683E-05 7.2744E-07 -1.2287E-08
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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 10.96 f6(mm) 5.68
f2(mm) 6.56 f7(mm) -28.88
f3(mm) -9.87 f(mm) 3.44
f4(mm) 28.71 TTL(mm) 5.14
f5(mm) -74.30 ImgH(mm) 3.50
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 of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 10A to 10D, the optical imaging system according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 convex, and an image-side surface S6 thereof is concave. 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 negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. 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 5.2835E-02 -2.4058E-01 1.2548E+00 -3.9435E+00 7.7162E+00 -9.4347E+00 6.9855E+00 -2.8572E+00 4.9448E-01
S2 1.0968E-01 -6.4245E-01 3.0012E+00 -9.4614E+00 1.8828E+01 -2.3435E+01 1.7684E+01 -7.3892E+00 1.3098E+00
S3 -4.6076E-02 -7.5990E-02 5.1124E-01 -2.3066E+00 5.6629E+00 -7.9854E+00 6.5465E+00 -2.9047E+00 5.3855E-01
S4 -7.8728E-02 3.8826E-01 -1.1143E+00 1.4765E+00 -3.7215E-01 -1.4611E+00 1.9910E+00 -1.0628E+00 2.1332E-01
S5 3.0910E-02 1.0150E-01 -5.0396E-01 8.4368E-01 -6.9304E-01 1.6503E-01 1.5379E-01 -1.1863E-01 2.4398E-02
S6 2.4008E-02 4.6322E-02 -1.7535E-01 2.4032E-01 -1.8165E-01 6.1666E-02 7.5362E-03 -1.1397E-02 2.2765E-03
S7 -4.8620E-02 5.2360E-02 -1.6231E-01 3.5516E-01 -4.7751E-01 3.9461E-01 -1.9535E-01 5.3178E-02 -6.1475E-03
S8 -2.6671E-02 -8.2302E-02 2.3318E-01 -4.2646E-01 4.6982E-01 -3.2141E-01 1.3273E-01 -3.0117E-02 2.8711E-03
S9 -1.5937E-02 2.6623E-02 9.9838E-03 -7.1593E-02 8.4650E-02 -5.0800E-02 1.6764E-02 -2.8790E-03 2.0123E-04
S10 -3.4351E-01 5.7462E-01 -6.7268E-01 5.1370E-01 -2.5020E-01 7.7450E-02 -1.4760E-02 1.5783E-03 -7.2458E-05
S11 1.2568E-01 -6.0901E-02 -1.5125E-02 1.4779E-02 -3.7721E-03 4.2605E-04 -1.4127E-05 -1.1526E-06 8.1500E-08
S12 8.8639E-02 1.5451E-02 -7.5790E-02 4.7418E-02 -1.5224E-02 2.8947E-03 -3.2916E-04 2.0747E-05 -5.5908E-07
S13 -1.2414E-01 -1.9749E-02 4.3256E-02 -1.7773E-02 3.7534E-03 -4.6425E-04 3.4005E-05 -1.3703E-06 2.3451E-08
S14 -1.6910E-01 8.5166E-02 -3.2803E-02 8.9117E-03 -1.5665E-03 1.6912E-04 -1.0601E-05 3.4426E-07 -4.2509E-09
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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
TABLE 18
Fig. 12A shows an on-axis chromatic aberration curve for the optical imaging system of example 6, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 12A to 12D, the optical imaging system according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging system 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, filter E8, and imaging plane S17.
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 convex, and an image-side surface S6 thereof is concave. 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 negative refractive power, wherein an object-side surface S9 thereof is concave, 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 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.
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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 11.70 f6(mm) 3.30
f2(mm) 6.70 f7(mm) -5.62
f3(mm) -8.65 f(mm) 3.41
f4(mm) 26.51 TTL(mm) 5.15
f5(mm) -46.12 ImgH(mm) 3.48
Table 21
Fig. 14A shows an on-axis chromatic aberration curve for the optical imaging system of embodiment 7, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 14A to 14D, the optical imaging system according to embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.
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 negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. 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 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 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 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 gives 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 half the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 11.09 f6(mm) 4.75
f2(mm) 7.00 f7(mm) -8.70
f3(mm) -8.88 f(mm) 3.68
f4(mm) 37.82 TTL(mm) 5.42
f5(mm) -2363.45 ImgH(mm) 3.74
Table 24
Fig. 16A shows an on-axis chromatic aberration curve for the optical imaging system of embodiment 8, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the system. 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 at different viewing angles. 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 system. As can be seen from fig. 16A to 16D, the optical imaging system according to embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 25.
Conditional\embodiment 1 2 3 4 5 6 7 8
HFOV(°) 45.2 45.2 45.2 45.1 45.2 45.2 45.2 45.0
f1/f 3.17 3.56 4.10 3.31 3.19 3.87 3.43 3.01
f2/f 2.01 1.86 1.73 1.99 1.91 1.83 1.96 1.90
|f3/f| 2.45 2.39 2.42 2.51 2.87 2.60 2.54 2.41
f/R14 4.44 4.74 4.76 4.51 4.63 3.73 4.20 4.12
f/R5 1.17 1.23 1.19 1.26 1.17 1.32 1.23 1.22
R1/R2 0.69 0.73 0.79 0.71 0.71 0.77 0.72 0.70
TTL/ImgH 1.49 1.49 1.49 1.48 1.47 1.45 1.48 1.45
CT2/T23 10.37 10.46 10.47 10.24 11.00 10.14 10.24 10.58
f/∑CT 1.25 1.27 1.29 1.27 1.25 1.28 1.30 1.30
R5/R6 1.55 1.54 1.55 1.51 1.48 1.47 1.52 1.55
T67/(CT6+CT7) 0.11 0.10 0.13 0.10 0.10 0.10 0.16 0.17
f/EPD 1.55 1.55 1.55 1.55 1.55 1.55 1.55 1.55
f*TTL/ImgH 5.17 5.17 5.15 5.08 5.05 4.99 5.04 5.34
Table 25
The present application also provides an imaging device, the electron-sensitive element of which may 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 foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (13)

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,
It is characterized in that the method comprises the steps of,
the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has positive optical power;
the third lens has negative focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens, the fifth lens and the sixth lens all have optical power;
the seventh lens has optical power, the object side surface of the seventh lens is a convex surface, the image side surface of the seventh lens is a concave surface,
half of the HFOV of the maximum field angle of the optical imaging system meets the HFOV of 45.0 degrees or more;
the number of lenses having optical power in the optical imaging system is seven;
the central thickness CT2 of the second lens on the optical axis and the interval distance T23 of the second lens and the third lens on the optical axis satisfy the conditions that CT2/T23 is more than 10 and less than 12;
at least one of the object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror surface.
2. 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 2 < f1/f < 5.
3. The optical imaging system of claim 1, wherein an effective focal length f2 of the second lens and a total effective focal length f of the optical imaging system satisfy 1.5 < f2/f < 2.5.
4. The optical imaging system of claim 1, wherein an effective focal length f3 of the third lens and a total effective focal length f of the optical imaging system satisfy 2.1 < |f3/f| < 3.
5. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the radius of curvature R14 of the image side of the seventh lens satisfy 3.5 < f/R14 < 5.
6. The optical imaging system of claim 1, wherein a total effective focal length f of the optical imaging system and a radius of curvature R5 of an object side of the third lens satisfy 1 < f/R5 < 1.5.
7. The optical imaging system of claim 1, wherein a radius of curvature R1 of an object side of the first lens and a radius of curvature R2 of an image side of the first lens satisfy 0.5 < R1/R2 < 1.
8. The optical imaging system of claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy 1.0 < R5/R6 < 2.0.
9. The optical imaging system of claim 1, wherein a distance TTL from a center of an object side surface of the first lens to an imaging surface of the optical imaging system on the optical axis and a half of a diagonal length ImgH of an effective pixel region on the imaging surface of the optical imaging system satisfy 1.45 ∈ttl/ImgH < 1.7.
10. The optical imaging system of claim 9, wherein a total effective focal length f of the optical imaging system, a distance TTL from a center of an object side surface of the first lens to an imaging surface of the optical imaging system on the optical axis, and a half of a diagonal length ImgH of an effective pixel area on the imaging surface of the optical imaging system satisfy 4.5 < f x TTL/ImgH < 5.5.
11. The optical imaging system according to claim 1, wherein a sum Σct of a total effective focal length f of the optical imaging system and center thicknesses of the first lens to the seventh lens on the optical axis, respectively, satisfies 0.5 < f/Σct < 1.5.
12. The optical imaging system of claim 11, wherein a separation distance T67 of the sixth lens and the seventh lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy 0 < T67/(CT 6+ct 7) < 0.5.
13. The optical imaging system of any of claims 1 to 12, wherein a total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy 1.55 +.f/EPD < 1.8.
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