CN108732724B - Optical imaging system - Google Patents

Optical imaging system Download PDF

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Publication number
CN108732724B
CN108732724B CN201810961646.4A CN201810961646A CN108732724B CN 108732724 B CN108732724 B CN 108732724B CN 201810961646 A CN201810961646 A CN 201810961646A CN 108732724 B CN108732724 B CN 108732724B
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lens
imaging system
optical imaging
optical
curvature
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CN108732724A (en
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黄林
游兴海
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201810961646.4A priority Critical patent/CN108732724B/en
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Priority to PCT/CN2019/095204 priority patent/WO2020038134A1/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

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

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 optical power; the second lens has negative focal power; the third lens has optical power; the fourth lens has optical power; the fifth lens has focal power, and the image side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, and both the object side surface and the image side surface of the sixth lens are convex; the seventh lens has negative focal power, and the object side surface of the seventh lens is concave. The imaging surface of the optical imaging system has half of the effective pixel area with the diagonal length of ImgH, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system meet the requirement that ImgH/(f/EPD) is more than or equal to 2.4mm.

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 development of science and technology, portable electronic products are gradually rising, and portable electronic products with a camera shooting function are more favored by people, so that the market demand for camera shots suitable for the portable electronic products is gradually increasing. On the one hand, since portable electronic products such as smartphones tend to be miniaturized, the total length of the lens is limited, thereby increasing the difficulty in designing the lens. On the other hand, with the improvement of the performance and the reduction of the size of the common photosensitive element such as the photosensitive coupling element (CCD) or the Complementary Metal Oxide Semiconductor (CMOS), the pixel number and the pixel size of the photosensitive element are increased and reduced, so that the requirements for high imaging quality and miniaturization of the matched imaging lens are raised.
In order to meet the miniaturization requirement, the conventional lens is generally configured to have an F-number (F-number) of 2.0 or more, so as to achieve both miniaturization and good optical performance. However, with the continuous development of portable electronic products such as smart phones, higher requirements are put forward on the matched imaging lens, and particularly under the conditions of insufficient light (such as overcast and rainy days, dusk, etc.), hand shake, etc., the lens with the F number of 2.0 or more than 2.0 cannot meet the imaging requirements of higher orders.
Disclosure of Invention
The present application provides an optical imaging system, such as a large aperture imaging lens, applicable to portable electronic products that at least addresses or partially addresses at least one of the above-mentioned shortcomings in the 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 may have positive optical power; the second lens may have negative optical power; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power, and the image side surface of the fifth lens can be concave; the sixth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the seventh lens may have negative optical power, and an object side surface thereof may be concave. The imaging plane of the optical imaging system has half of the diagonal line length of an effective pixel area, and the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system can meet the requirement that ImgH/(f/EPD) is more than or equal to 2.4mm.
In one embodiment, the combined focal length f123 of the first lens, the second lens and the third lens and the total effective focal length f of the optical imaging system may satisfy 0.5 < f123/f < 1.5.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the effective focal length f1 of the first lens may satisfy 0.2 < R1/f1 < 0.7.
In one embodiment, the radius of curvature R4 of the image side of the second lens and the radius of curvature R3 of the object side of the second lens may satisfy 0.3 < R4/R3 < 0.8.
In one embodiment, the total effective focal length f of the optical imaging system, the combined focal length f45 of the fourth lens and the fifth lens, and the combined focal length f67 of the sixth lens and the seventh lens may satisfy |f/f45|+|f/f67|+|0.6.
In one embodiment, the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, and the effective focal length f5 of the fifth lens satisfy 0 < (r9+r10)/|f5| < 0.7.
In one embodiment, the center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis may satisfy 1.2 < CT6/CT7 < 1.9.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, 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 0.4.ltoreq.R11+R12)/|R13-R14|.ltoreq.2.4.
In one embodiment, the maximum effective half-caliber DT51 of the object side of the fifth lens and the maximum effective half-caliber DT71 of the object side of the seventh lens may satisfy 0.3 < DT51/DT71 < 0.7.
In one embodiment, the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis may satisfy 0.3 < ET6/CT6 < 0.7.
In one embodiment, the distance TTL between the object side surface of the first lens and 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 TTL/ImgH < 1.65.
In one embodiment, the center thickness CT1 of the first lens on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis may satisfy 1.1 < CT1/ttl×10 < 1.6.
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 may have positive optical power; the second lens may have negative optical power; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power, and the image side surface of the fifth lens can be concave; the sixth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the seventh lens may have negative optical power, and an object side surface thereof may be concave. The radius of curvature R11 of the object-side surface of the sixth lens element, the radius of curvature R12 of the image-side surface of the sixth lens element, 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 0.4 (R11+R12)/|R13-R14|2.4.
In yet 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 may have positive optical power; the second lens may have negative optical power; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power, and the image side surface of the fifth lens can be concave; the sixth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the seventh lens may have negative optical power, and an object side surface thereof may be concave. The combined focal length f123 of the first lens, the second lens and the third lens and the total effective focal length f of the optical imaging system can meet 0.5 < f123/f < 1.5.
In yet 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 may have positive optical power; the second lens may have negative optical power; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power, and the image side surface of the fifth lens can be concave; the sixth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the seventh lens may have negative optical power, and an object side surface thereof may be concave. The center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis can satisfy 1.2 < CT6/CT7 < 1.9.
In yet 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 may have positive optical power; the second lens may have negative optical power; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power, and the image side surface of the fifth lens can be concave; the sixth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the seventh lens may have negative optical power, and an object side surface thereof may be concave. The maximum effective half-caliber DT51 of the object side surface of the fifth lens and the maximum effective half-caliber DT71 of the object side surface of the seventh lens can satisfy 0.3 < DT51/DT71 < 0.7.
In yet 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 may have positive optical power; the second lens may have negative optical power; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power, and the image side surface of the fifth lens can be concave; the sixth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the seventh lens may have negative optical power, and an object side surface thereof may be concave. The thickness ET6 of the edge of the sixth lens and the thickness CT6 of the center of the sixth lens on the optical axis can satisfy 0.3 < ET6/CT6 < 0.7.
The optical imaging system has at least one beneficial effect of ultrathin, miniaturized, large-aperture, 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. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the 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 sequentially arranged from the object side to the image side along the optical axis, and an air space can be arranged between any two adjacent lenses.
In an exemplary embodiment, the first lens may have positive optical power; the second lens may have negative optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive focal power or negative focal power, and the image side surface of the fifth lens can be concave; the sixth lens element with positive refractive power may have a convex object-side surface and a convex image-side surface; and the seventh lens may have negative optical power, and an object-side surface thereof may be concave. By defining the surface forms of the first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens or the optical powers thereof, the optical imaging system can be made to have good imaging quality.
In an exemplary embodiment, the object side surface of the first lens may be convex.
In an exemplary embodiment, the object-side surface of the second lens may be convex and the image-side surface may be concave.
In an exemplary embodiment, the object side surface of the fifth lens may be convex.
In an exemplary embodiment, the image side surface of the seventh lens may be concave.
In an exemplary embodiment, the optical imaging system of the present application may satisfy a conditional expression ImgH/(f/EPD) > 2.4mm, where ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system, 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, imgH, f and EPD may further satisfy 2.44 mm.ltoreq.ImgH/(f/EPD). Ltoreq.2.81 mm. By properly adjusting the total effective focal length, the entrance pupil diameter and the image height of the optical imaging system, the optical imaging system can have the characteristics of large aperture, large image plane, high pixel and the like.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < f123/f < 1.5, where f123 is a combined focal length of the first lens, the second lens, and the third lens, and f is a total effective focal length of the optical imaging system. More specifically, f123 and f may further satisfy 0.8.ltoreq.f123/f.ltoreq.1.2, for example, 0.97.ltoreq.f123/f.ltoreq.1.08. By restricting the ratio range of the combined focal length of the first lens, the second lens and the third lens to the total focal length of the system, the first lens, the second lens and the third lens can be combined to be used as a lens group with reasonable positive focal power to carry out aberration balance with the lens group with negative focal power at the rear end, so that good imaging quality is obtained, and the effect of high resolution is realized.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression |f/f45|+|f/f67|+|0.6, where f is the total effective focal length of the optical imaging system, f45 is the combined focal length of the fourth lens and the fifth lens, and f67 is the combined focal length of the sixth lens and the seventh lens. More specifically, f45, and f67 further satisfy 0.26.ltoreq.f/f 45.ltoreq.f/f 67.ltoreq.0.60. By reasonably controlling the combined focal length of the fourth lens and the fifth lens and the combined focal length of the sixth lens and the seventh lens, the aberration contribution of the four lenses can be reasonably controlled, so that the aberration generated by the four lenses can be balanced with the aberration generated by the front-end optical lens, the total aberration of the system is in a reasonable horizontal state, and the optical imaging system has good imaging quality.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition 0 < (r9+r10)/|f5| < 0.7, where R9 is a radius of curvature of the object side of the fifth lens, R10 is a radius of curvature of the image side of the fifth lens, and f5 is an effective focal length of the fifth lens. More specifically, R9, R10 and f5 may further satisfy 0.01.ltoreq.R9+R10)/|f5|.ltoreq.0.64. By controlling the curvature radius of the object side surface and the image side surface of the fifth lens, the contribution rate of the third-order astigmatism of the fifth lens can be controlled to a certain extent, so that the third-order astigmatism of the fifth lens is in a reasonable range, and the effect of high resolution of the image system can be realized.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < R4/R3 < 0.8, where R4 is a radius of curvature of the image side of the second lens and R3 is a radius of curvature of the object side of the second lens. More specifically, R4 and R3 may further satisfy 0.36.ltoreq.R4/R3.ltoreq.0.61. By limiting the ratio range of the curvature radius of the object side surface and the image side surface of the second lens, the shape of the second lens can be effectively restrained, and further the aberration contribution rate of the object side surface of the second lens, the aberration related to the aperture zone of the system and the imaging quality of the system are effectively controlled.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.2 < R1/f1 < 0.7, where R1 is a radius of curvature of an object side surface of the first lens, and f1 is an effective focal length of the first lens. More specifically, R1 and f1 may further satisfy 0.48.ltoreq.R1/f1.ltoreq.0.56. By controlling the radius of curvature of the object-side surface of the first lens and the effective focal length of the first lens, the contribution rate of the fifth-order spherical aberration of the object-side surface of the first lens can be controlled to a certain extent so as to balance the fifth-order spherical aberration generated by the image-side surface of the first lens, and therefore the fifth-order spherical aberration of the first lens is controlled within a reasonable range.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition that TTL/ImgH < 1.65, where TTL is a distance between 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 1.46.ltoreq.TTL/ImgH.ltoreq.1.61. The ultra-thin and high-pixel optical imaging system is realized simultaneously by restricting the ratio of the on-axis distance from the object side surface of the first lens to the imaging surface to the half of the diagonal length of the effective pixel area on the imaging surface.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.2 < CT6/CT7 < 1.9, where 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, CT6 and CT7 may further satisfy 1.29.ltoreq.CT6/CT 7.ltoreq.1.88. The distortion contribution of the sixth lens and the seventh lens is controlled within a reasonable range by controlling the ratio of the center thicknesses of the sixth lens and the seventh lens, so that the final distortion of each view field is below 2%, and the need of later software debugging is avoided.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.4+.R11+R12)/|R13-R14|+.2.4, where R11 is the radius of curvature of the object-side surface of the sixth lens, R12 is the radius of curvature of the image-side surface of the sixth lens, R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens. More specifically, R11, R12, R13 and R14 may further satisfy 0.40.ltoreq.R11+R12)/|R13-R14|.ltoreq.2.28. By reasonably limiting the curvature radiuses of the object side surface and the image side surface of the sixth lens and the seventh lens, the incidence angles of the chief rays of all view fields of the optical imaging system on the image surface can be reasonably controlled relatively, and the requirement of the optical system on designing the incidence angle of the chief rays is met.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.1 < CT1/ttl×10 < 1.6, where CT1 is a center thickness of the first lens on the optical axis, and TTL is a distance between an object side surface of the first lens and an imaging surface of the optical imaging system on the optical axis. More specifically, CT1 and TTL may further satisfy 1.34.ltoreq.CT 1/TTL.times.10.ltoreq.1.43. The range of residual distortion after balancing can be reasonably controlled by controlling the range of the center thickness of the first lens on the optical axis, so that the system has good distortion performance.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < DT51/DT71 < 0.7, where DT51 is the maximum effective half-caliber of the object side surface of the fifth lens and DT71 is the maximum effective half-caliber of the object side surface of the seventh lens. More specifically, DT51 and DT71 may further satisfy 0.45. Ltoreq.DT 51/DT 71. Ltoreq.0.55. The maximum effective half calibers of the object side surfaces of the fifth lens and the seventh lens are reasonably limited, so that the size of the imaging system can be effectively reduced, the miniaturization requirement can be met, and the resolution of the imaging system can be improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.3 < ET6/CT6 < 0.7, where ET6 is an edge thickness of the sixth lens and CT6 is a center thickness of the sixth lens on the optical axis. More specifically, ET6 and CT6 may further satisfy 0.48.ltoreq.ET 6/CT 6.ltoreq.0.66. By controlling the ratio of the edge thickness of the sixth lens to the center thickness of the sixth lens on the optical axis, the system has good imaging quality, lower sensitivity, easy injection molding and higher yield.
In an exemplary embodiment, the optical imaging system may further include a diaphragm to enhance the imaging quality of the imaging system. The diaphragm may be disposed at any position between the object side and the image side as needed, for example, the diaphragm may be disposed 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 also possible to have advantageous effects such as ultra-thin, miniaturization, large aperture, 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 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 concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is 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 the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000111
Figure BDA0001773960690000121
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:
Figure BDA0001773960690000122
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 -4.5000E-04 7.0560E-03 -1.5340E-02 1.7893E-02 -1.3180E-02 6.0210E-03 -1.6800E-03 2.5900E-04 -1.7000E-05
S2 -2.7330E-02 5.6521E-02 -7.0640E-02 5.6769E-02 -3.0090E-02 1.0191E-02 -2.0800E-03 2.2400E-04 -8.9000E-06
S3 -1.4390E-02 4.1193E-02 -5.7190E-02 5.5134E-02 -3.4790E-02 1.4390E-02 -3.7300E-03 5.4100E-04 -3.3000E-05
S4 2.9900E-03 6.1750E-03 1.2042E-02 -3.0790E-02 3.3819E-02 -1.7950E-02 3.1520E-03 8.9100E-04 -3.3000E-04
S5 1.1036E-02 -4.5000E-05 -4.2500E-03 1.3822E-02 -2.4960E-02 2.8550E-02 -1.8700E-02 6.5930E-03 -9.5000E-04
S6 2.6670E-03 -2.4800E-02 8.5779E-02 -1.8592E-01 2.5532E-01 -2.2067E-01 1.1701E-01 -3.4730E-02 4.4470E-03
S7 -3.3910E-02 -2.8150E-02 6.8609E-02 -1.4271E-01 1.7980E-01 -1.4377E-01 7.0857E-02 -1.9690E-02 2.3610E-03
S8 -5.5680E-02 2.0810E-02 -2.1700E-02 1.2513E-02 -6.8800E-03 3.4030E-03 -1.1300E-03 1.9700E-04 -1.1000E-05
S9 -4.6050E-02 1.6285E-02 -1.2680E-02 1.5102E-02 -1.4180E-02 7.2570E-03 -2.0700E-03 3.1100E-04 -1.9000E-05
S10 -1.7710E-02 -3.7890E-02 4.5747E-02 -2.9090E-02 1.1372E-02 -2.8800E-03 4.6600E-04 -4.4000E-05 1.8200E-06
S11 -5.5400E-03 -5.3000E-03 9.7300E-05 7.3700E-04 -5.1000E-04 1.5400E-04 -2.3000E-05 1.6300E-06 -4.6000E-08
S12 9.7310E-03 -1.0300E-03 2.1560E-03 -1.7000E-03 4.9600E-04 -7.3000E-05 5.6500E-06 -2.1000E-07 2.8200E-09
S13 -4.6410E-02 2.6360E-02 -8.3000E-03 1.8750E-03 -2.9000E-04 2.8200E-05 -1.7000E-06 5.6100E-08 -7.9000E-10
S14 -3.0240E-02 1.0470E-02 -2.7100E-03 4.2500E-04 -4.3000E-05 2.6000E-06 -6.9000E-08 -7.7000E-10 5.7400E-11
TABLE 2
Table 3 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 1, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.88 f6(mm) 4.11
f2(mm) -8.63 f7(mm) -3.26
f3(mm) 17.28 f(mm) 5.71
f4(mm) -26.72 TTL(mm) 6.70
f5(mm) 799.90 ImgH(mm) 4.60
TABLE 3 Table 3
The optical imaging system in embodiment 1 satisfies:
ImgH/(f/EPD) =2.81 mm, where ImgH is half the diagonal length of the effective pixel region on the imaging surface S17, f is the total effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system;
f123/f=1.08, where f123 is the combined focal length of the first lens E1, the second lens E2, and the third lens E3, and f is the total effective focal length of the optical imaging system;
f/f45+|f/f67|=0.26, where f is the total effective focal length of the optical imaging system, f45 is the combined focal length of the fourth lens E4 and the fifth lens E5, and f67 is the combined focal length of the sixth lens E6 and the seventh lens E7;
(r9+r10)/|f5|=0.01, wherein R9 is the radius of curvature of the object-side surface S9 of the fifth lens element E5, R10 is the radius of curvature of the image-side surface S10 of the fifth lens element E5, and f5 is the effective focal length of the fifth lens element E5;
r4/r3=0.60, wherein R4 is a radius of curvature of the image side surface S4 of the second lens element E2, and R3 is a radius of curvature of the object side surface S3 of the second lens element E2;
r1/f1=0.49, wherein R1 is a radius of curvature of the object side surface S1 of the first lens E1, and f1 is an effective focal length of the first lens E1;
TTL/imgh=1.46, where TTL is the distance between 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;
CT6/CT7 = 1.42, where CT6 is the center thickness of the sixth lens E6 on the optical axis, and CT7 is the center thickness of the seventh lens E7 on the optical axis;
(r11+r12)/|r13-r14|=0.40, wherein R11 is the radius of curvature of the object-side surface S11 of the sixth lens element E6, R12 is the radius of curvature of the image-side surface S12 of the sixth lens element E6, R13 is the radius of curvature of the object-side surface S13 of the seventh lens element E7, and R14 is the radius of curvature of the image-side surface S14 of the seventh lens element E7;
CT 1/ttlx10=1.43, where CT1 is the center thickness of the first lens E1 on the optical axis, and TTL is the distance from the object side surface S1 of the first lens E1 to the imaging surface S17 on the optical axis;
DT51/DT71 = 0.55, wherein DT51 is the maximum effective half-caliber of the fifth lens E5 object side S9 and DT71 is the maximum effective half-caliber of the seventh lens E7 object side S13;
ET6/CT6 = 0.48, where ET6 is the edge thickness of the sixth lens E6 and CT6 is the center thickness of the sixth lens E6 on the optical axis.
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 corresponding to different image heights. 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 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 concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000151
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 1.2400E-03 8.3100E-04 -2.8100E-03 3.7180E-03 -3.1200E-03 1.5460E-03 -4.6000E-04 7.3500E-05 -5.0000E-06
S2 -1.7410E-02 3.3277E-02 -4.1730E-02 3.5800E-02 -2.1740E-02 9.0250E-03 -2.4300E-03 3.8100E-04 -2.6000E-05
S3 -5.0600E-03 2.4009E-02 -3.2380E-02 3.1043E-02 -2.1600E-02 1.0837E-02 -3.6400E-03 7.2300E-04 -6.3000E-05
S4 5.6950E-03 7.3480E-03 1.9160E-03 -1.0910E-02 1.6346E-02 -1.3510E-02 6.8090E-03 -1.8700E-03 1.9700E-04
S5 7.5300E-03 1.1910E-03 3.7610E-03 -5.4700E-03 8.9350E-03 -7.8700E-03 4.4800E-03 -1.3600E-03 1.6200E-04
S6 -1.6400E-03 -3.3400E-03 1.6482E-02 -4.2140E-02 6.8441E-02 -6.6800E-02 3.9215E-02 -1.2670E-02 1.7500E-03
S7 -4.0760E-02 5.1830E-03 -3.6440E-02 6.3171E-02 -7.8720E-02 6.2742E-02 -3.1130E-02 8.7350E-03 -1.0800E-03
S8 -6.1020E-02 1.6233E-02 -4.7400E-03 -2.0660E-02 3.1979E-02 -2.3990E-02 1.0339E-02 -2.4400E-03 2.4600E-04
S9 -5.6930E-02 1.9504E-02 2.2160E-03 -1.9740E-02 1.9684E-02 -1.0870E-02 3.5920E-03 -6.6000E-04 5.2100E-05
S10 -3.5860E-02 8.9500E-03 1.2050E-03 -2.3800E-03 9.4600E-04 -1.8000E-04 1.5200E-05 -6.9000E-08 -4.4000E-08
S11 -8.8900E-03 -5.4400E-03 1.4400E-03 4.8100E-05 -1.9000E-04 5.2800E-05 -6.1000E-06 3.0400E-07 -4.8000E-09
S12 2.9053E-02 -1.6190E-02 6.1710E-03 -1.7200E-03 2.9600E-04 -3.0000E-05 1.7800E-06 -5.7000E-08 8.4600E-10
S13 -2.3670E-02 5.9660E-03 5.4200E-04 -3.7000E-04 6.3700E-05 -6.0000E-06 3.2600E-07 -9.9000E-09 1.3000E-10
S14 -2.7320E-02 7.1710E-03 -1.4100E-03 1.6200E-04 -8.6000E-06 -1.4000E-07 4.6200E-08 -2.3000E-09 3.9600E-11
TABLE 5
Table 6 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 2, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.85 f6(mm) 4.46
f2(mm) -10.13 f7(mm) -3.02
f3(mm) 20.85 f(mm) 5.94
f4(mm) -40.44 TTL(mm) 6.90
f5(mm) -504.07 ImgH(mm) 4.60
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 corresponding to different image heights. 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 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 positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000171
Figure BDA0001773960690000181
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 5.2500E-04 8.9700E-04 -2.7500E-03 3.3480E-03 -2.7400E-03 1.3690E-03 -4.2000E-04 7.0700E-05 -5.1000E-06
S2 -1.1400E-02 2.4225E-02 -3.0120E-02 2.5113E-02 -1.4650E-02 5.7790E-03 -1.4600E-03 2.1400E-04 -1.4000E-05
S3 -9.9000E-03 2.2438E-02 -2.5310E-02 2.1052E-02 -1.1950E-02 4.6280E-03 -1.1500E-03 1.6300E-04 -9.6000E-06
S4 4.4750E-03 5.5730E-03 -2.3100E-03 1.4130E-03 -6.2000E-05 3.2800E-04 -5.1000E-04 3.5400E-04 -9.0000E-05
S5 9.2110E-03 -1.6300E-03 1.8590E-03 9.6100E-04 -1.3500E-03 2.3800E-03 -1.7600E-03 7.3800E-04 -1.3000E-04
S6 -3.4000E-05 6.7590E-03 -3.2620E-02 7.1179E-02 -9.1440E-02 7.4207E-02 -3.6670E-02 1.0106E-02 -1.1900E-03
S7 -4.1100E-02 1.9190E-03 -2.8960E-02 4.4929E-02 -4.7850E-02 3.2857E-02 -1.4120E-02 3.4240E-03 -3.7000E-04
S8 -5.9020E-02 1.0156E-02 -6.5300E-03 -1.2140E-02 2.4131E-02 -1.9370E-02 8.3960E-03 -1.9400E-03 1.8800E-04
S9 -5.4890E-02 2.7154E-02 -2.0260E-02 8.1960E-03 -2.5000E-04 -1.4300E-03 6.7000E-04 -1.4000E-04 1.0700E-05
S10 -3.7210E-02 1.9723E-02 -1.0530E-02 4.6790E-03 -1.5600E-03 3.5200E-04 -5.1000E-05 4.2100E-06 -1.5000E-07
S11 -1.1500E-02 -9.0000E-04 -5.9000E-05 1.0800E-04 -6.9000E-05 1.1200E-05 2.0200E-07 -1.5000E-07 8.1500E-09
S12 2.8322E-02 -1.7140E-02 6.7210E-03 -1.7600E-03 2.7800E-04 -2.5000E-05 1.2800E-06 -3.1000E-08 2.2900E-10
S13 -1.7490E-02 2.1590E-03 1.4290E-03 -4.6000E-04 6.4100E-05 -5.2000E-06 2.4700E-07 -6.6000E-09 7.5500E-11
S14 -2.3860E-02 5.9720E-03 -1.1000E-03 1.2100E-04 -6.4000E-06 -5.6000E-08 2.5600E-08 -1.2000E-09 1.8900E-11
TABLE 8
Table 9 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 3, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.46 f6(mm) 4.85
f2(mm) -9.24 f7(mm) -3.14
f3(mm) 45.12 f(mm) 6.39
f4(mm) 530.21 TTL(mm) 7.42
f5(mm) -40.87 ImgH(mm) 4.60
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 corresponding to different image heights. 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 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 negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000191
Figure BDA0001773960690000201
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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 8.3300E-04 2.1410E-03 -4.9600E-03 6.3150E-03 -5.1900E-03 2.6390E-03 -8.2000E-04 1.4000E-04 -1.0000E-05
S2 -1.0870E-02 1.7629E-02 -1.6460E-02 1.0881E-02 -5.3700E-03 1.8550E-03 -4.2000E-04 5.6100E-05 -3.4000E-06
S3 -1.2200E-02 1.5068E-02 -8.1300E-03 3.0310E-03 2.4200E-04 -8.5000E-04 4.1700E-04 -9.5000E-05 8.3300E-06
S4 5.2120E-03 8.6300E-04 1.8270E-03 2.3360E-03 -3.6000E-03 2.9340E-03 -1.3700E-03 4.3300E-04 -7.8000E-05
S5 1.1207E-02 -1.1020E-02 1.5637E-02 -1.6470E-02 1.7901E-02 -1.2140E-02 5.0590E-03 -1.1100E-03 9.3500E-05
S6 3.8710E-03 -1.9600E-03 -1.7830E-02 4.9084E-02 -6.3100E-02 4.9624E-02 -2.3550E-02 6.1720E-03 -6.8000E-04
S7 -3.6030E-02 -1.2150E-02 -7.9900E-03 2.0852E-02 -2.9980E-02 2.6058E-02 -1.3900E-02 4.0760E-03 -5.2000E-04
S8 -4.9960E-02 -1.5350E-02 2.6084E-02 -3.9990E-02 4.2105E-02 -2.7330E-02 1.0500E-02 -2.2100E-03 1.9900E-04
S9 -5.0120E-02 7.2060E-03 1.6330E-03 -3.8500E-03 4.6980E-03 -3.1800E-03 1.1070E-03 -1.9000E-04 1.3400E-05
S10 -3.3200E-02 1.2085E-02 -3.9700E-03 2.1960E-03 -1.2400E-03 4.0000E-04 -7.1000E-05 6.5000E-06 -2.4000E-07
S11 -9.7400E-03 -3.2800E-03 1.7070E-03 -6.4000E-04 1.5800E-04 -3.8000E-05 6.7800E-06 -6.4000E-07 2.3100E-08
S12 2.6231E-02 -1.6090E-02 6.0450E-03 -1.4000E-03 1.8100E-04 -1.1000E-05 -7.9000E-08 3.8900E-08 -1.3000E-09
S13 -1.7480E-02 3.1140E-03 7.2100E-04 -2.5000E-04 3.2700E-05 -2.3000E-06 9.2500E-08 -2.0000E-09 1.6400E-11
S14 -2.2310E-02 5.9960E-03 -1.1800E-03 1.4900E-04 -1.2000E-05 5.5500E-07 -1.4000E-08 1.5200E-10 -1.4000E-13
TABLE 11
Table 12 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 4, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.26 f6(mm) 5.04
f2(mm) -9.50 f7(mm) -3.24
f3(mm) -401.95 f(mm) 6.39
f4(mm) 190.00 TTL(mm) 7.39
f5(mm) -45.33 ImgH(mm) 4.60
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 corresponding to different image heights. 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 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 negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000221
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.
Figure BDA0001773960690000222
Figure BDA0001773960690000231
TABLE 14
Table 15 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 5, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.24 f6(mm) 5.15
f2(mm) -9.52 f7(mm) -3.25
f3(mm) -293.93 f(mm) 6.39
f4(mm) -699.98 TTL(mm) 7.40
f5(mm) -63.26 ImgH(mm) 4.60
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 corresponding to different image heights. 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 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 concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. 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 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 the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000241
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 9.8800E-04 1.4530E-03 -3.6000E-03 4.5660E-03 -3.7800E-03 1.9040E-03 -5.8000E-04 9.9100E-05 -7.2000E-06
S2 -1.0850E-02 1.7058E-02 -1.9490E-02 1.5039E-02 -8.3500E-03 3.2450E-03 -8.4000E-04 1.3200E-04 -9.4000E-06
S3 -4.7900E-03 1.5805E-02 -1.6750E-02 1.2405E-02 -6.1700E-03 2.4260E-03 -7.9000E-04 1.7900E-04 -1.9000E-05
S4 4.2500E-03 1.5794E-02 -1.6500E-02 2.1466E-02 -2.3650E-02 1.9402E-02 -1.0090E-02 2.9470E-03 -3.8000E-04
S5 7.0550E-03 5.2800E-03 -9.1900E-03 2.2229E-02 -3.0780E-02 2.6782E-02 -1.3740E-02 3.9080E-03 -4.8000E-04
S6 -4.5600E-03 4.6550E-03 -8.6700E-03 1.3717E-02 -1.1620E-02 4.3700E-03 7.9500E-04 -1.1600E-03 2.7800E-04
S7 -4.0720E-02 2.6293E-02 -9.5060E-02 1.7831E-01 -2.2434E-01 1.8048E-01 -9.0310E-02 2.5579E-02 -3.1700E-03
S8 -5.7880E-02 1.9843E-02 -2.5060E-02 1.3979E-02 -1.8100E-03 -3.2600E-03 2.3540E-03 -6.8000E-04 7.3700E-05
S9 -4.4670E-02 6.5660E-03 -4.6400E-03 -2.1000E-04 1.4880E-03 -1.1200E-03 4.9000E-04 -1.2000E-04 1.1000E-05
S10 -3.0020E-02 3.5830E-03 1.7350E-03 -1.4600E-03 4.6200E-04 -6.9000E-05 1.3900E-06 8.0600E-07 -6.6000E-08
S11 -1.4430E-02 -5.0000E-03 1.8900E-03 3.2100E-04 -3.7000E-04 7.5600E-05 -3.8000E-06 -3.2000E-07 2.8100E-08
S12 3.6931E-02 -2.6980E-02 1.0941E-02 -2.7200E-03 4.1000E-04 -3.8000E-05 2.1200E-06 -7.2000E-08 1.2100E-09
S13 -1.7040E-02 1.6990E-03 1.6630E-03 -5.2000E-04 7.4300E-05 -6.0000E-06 2.8800E-07 -7.5000E-09 8.0800E-11
S14 -2.2690E-02 4.8000E-03 -5.0000E-04 -5.1000E-05 2.1200E-05 -2.6000E-06 1.6100E-07 -5.0000E-09 6.2100E-11
TABLE 17
Table 18 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 6, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.71 f6(mm) 5.02
f2(mm) -9.13 f7(mm) -3.03
f3(mm) 23.59 f(mm) 5.89
f4(mm) 802.00 TTL(mm) 6.87
f5(mm) 1001.79 ImgH(mm) 4.60
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 the corresponding distortion magnitude values at different image heights. 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 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 negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. 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 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 the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000261
Figure BDA0001773960690000271
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 1.0780E-03 6.9300E-04 -1.7400E-03 2.0620E-03 -1.6800E-03 8.3300E-04 -2.6000E-04 4.4200E-05 -3.4000E-06
S2 -8.3300E-03 1.4550E-02 -1.3320E-02 8.2830E-03 -3.8200E-03 1.2310E-03 -2.6000E-04 2.8800E-05 -1.2000E-06
S3 -1.4530E-02 1.8986E-02 -1.1250E-02 4.6650E-03 -3.6000E-04 -7.0000E-04 4.1500E-04 -1.1000E-04 1.2300E-05
S4 6.6200E-04 5.7260E-03 5.4200E-03 -1.4040E-02 2.0921E-02 -1.8200E-02 9.7190E-03 -2.8400E-03 3.3600E-04
S5 7.3700E-03 -4.4800E-03 6.2070E-03 -5.8700E-03 1.1004E-02 -1.0810E-02 6.4020E-03 -2.0200E-03 2.5900E-04
S6 4.6570E-03 -5.5200E-03 1.5060E-03 5.3210E-03 -6.1600E-03 4.0750E-03 -1.4000E-03 1.9900E-04 2.5800E-06
S7 -3.5700E-02 -1.3680E-02 6.8300E-04 3.4910E-03 -9.2700E-03 9.6230E-03 -5.6700E-03 1.7850E-03 -2.5000E-04
S8 -4.9890E-02 -2.4500E-02 4.3591E-02 -5.2770E-02 4.4194E-02 -2.4930E-02 8.8980E-03 -1.8100E-03 1.6100E-04
S9 -4.6210E-02 -1.9550E-02 3.6217E-02 -2.4240E-02 9.6310E-03 -2.5900E-03 4.7100E-04 -5.3000E-05 2.6300E-06
S10 -2.3410E-02 -1.2760E-02 2.2406E-02 -1.3220E-02 4.1870E-03 -7.9000E-04 8.5700E-05 -4.9000E-06 1.0600E-07
S11 -5.1100E-03 -8.7600E-03 5.5020E-03 -2.6500E-03 9.1400E-04 -2.2000E-04 3.4700E-05 -2.9000E-06 9.5900E-08
S12 2.8010E-02 -1.7180E-02 6.2940E-03 -1.4900E-03 2.1700E-04 -1.9000E-05 1.0700E-06 -3.5000E-08 5.7200E-10
S13 -1.7300E-02 2.9520E-03 7.6800E-04 -2.7000E-04 3.5300E-05 -2.6000E-06 1.1400E-07 -2.7000E-09 2.8300E-11
S14 -2.0720E-02 5.1620E-03 -9.0000E-04 9.6200E-05 -5.4000E-06 8.0800E-08 7.3600E-09 -4.0000E-10 5.9500E-12
Table 20
Table 21 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 7, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.25 f6(mm) 5.54
f2(mm) -9.25 f7(mm) -3.30
f3(mm) -802.58 f(mm) 6.39
f4(mm) -415.00 TTL(mm) 7.36
f5(mm) 800.07 ImgH(mm) 4.60
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 the corresponding distortion magnitude values at different image heights. 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 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 concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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).
Figure BDA0001773960690000281
Figure BDA0001773960690000291
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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 9.1500E-04 2.4310E-03 -5.3800E-03 6.7070E-03 -5.3800E-03 2.6620E-03 -8.1000E-04 1.3500E-04 -9.7000E-06
S2 -9.4100E-03 1.4657E-02 -1.5510E-02 1.0686E-02 -5.2900E-03 1.8610E-03 -4.6000E-04 7.0300E-05 -5.2000E-06
S3 -6.8000E-03 1.6701E-02 -1.4920E-02 9.3810E-03 -3.8400E-03 1.3450E-03 -4.6000E-04 1.2000E-04 -1.4000E-05
S4 3.2580E-03 1.7349E-02 -2.0540E-02 3.0793E-02 -3.6570E-02 3.0155E-02 -1.5440E-02 4.4350E-03 -5.6000E-04
S5 7.4370E-03 3.2400E-03 -5.1200E-03 1.5545E-02 -2.4350E-02 2.2484E-02 -1.1930E-02 3.4620E-03 -4.2000E-04
S6 -4.4700E-03 4.3890E-03 -6.2300E-03 4.5000E-03 3.7180E-03 -1.0490E-02 8.9970E-03 -3.5900E-03 5.7600E-04
S7 -3.6010E-02 8.3600E-03 -4.2610E-02 7.4690E-02 -8.8190E-02 6.5162E-02 -3.0010E-02 7.8880E-03 -9.4000E-04
S8 -5.1830E-02 1.1415E-02 -1.9810E-02 1.4591E-02 -5.9100E-03 5.0900E-04 6.3900E-04 -2.8000E-04 3.7400E-05
S9 -4.0830E-02 1.5390E-03 -9.3600E-03 1.0594E-02 -7.7400E-03 3.8750E-03 -1.1900E-03 1.9300E-04 -1.2000E-05
S10 -3.4990E-02 9.2880E-03 -7.0700E-03 6.0010E-03 -2.8000E-03 7.3000E-04 -1.1000E-04 9.3900E-06 -3.4000E-07
S11 -2.4560E-02 2.3360E-03 -2.1000E-03 2.1980E-03 -1.0400E-03 2.2200E-04 -2.1000E-05 6.1900E-07 1.0300E-08
S12 3.2842E-02 -2.3630E-02 9.4350E-03 -2.3100E-03 3.4600E-04 -3.2000E-05 1.8700E-06 -6.6000E-08 1.1200E-09
S13 -1.4960E-02 1.1980E-03 1.3620E-03 -3.7000E-04 4.2400E-05 -2.5000E-06 6.7300E-08 6.1100E-11 -2.8000E-11
S14 -2.0040E-02 4.1870E-03 -4.8000E-04 -1.2000E-05 9.6600E-06 -1.1000E-06 5.7300E-08 -1.4000E-09 9.9300E-12
Table 23
Table 24 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 8, a total effective focal length f of the optical imaging system, a distance TTL on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S17.
f1(mm) 4.67 f6(mm) 5.09
f2(mm) -9.00 f7(mm) -3.08
f3(mm) 21.95 f(mm) 5.89
f4(mm) -737.59 TTL(mm) 6.94
f5(mm) -157.54 ImgH(mm) 4.60
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 the corresponding distortion magnitude values at different image heights. 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
ImgH/(f/EPD)(mm) 2.81 2.63 2.44 2.44 2.44 2.65 2.44 2.65
f123/f 1.08 0.98 0.97 1.01 1.01 1.02 1.02 1.01
|f/f45|+|f/f67| 0.26 0.53 0.60 0.53 0.55 0.59 0.56 0.60
(R9+R10)/|f5| 0.01 0.03 0.64 0.54 0.35 0.01 0.02 0.07
R4/R3 0.60 0.61 0.50 0.40 0.38 0.56 0.36 0.54
R1/f1 0.49 0.48 0.56 0.56 0.56 0.49 0.56 0.49
TTL/ImgH 1.46 1.50 1.61 1.61 1.61 1.50 1.60 1.51
CT6/CT7 1.42 1.29 1.39 1.75 1.86 1.64 1.88 1.86
(R11+R12)/|R13-R14| 0.40 0.88 0.79 0.85 0.91 2.28 1.64 2.06
CT1/TTL*10 1.43 1.34 1.35 1.42 1.43 1.38 1.43 1.38
DT51/DT71 0.55 0.49 0.48 0.47 0.46 0.50 0.45 0.50
ET6/CT6 0.48 0.60 0.66 0.65 0.64 0.63 0.63 0.65
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 (22)

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 optical power;
the second lens has negative optical power;
the third lens has optical power;
the fourth lens has optical power;
the fifth lens has focal power, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive focal power, and both the object side surface and the image side surface of the sixth lens are convex;
the seventh lens has negative focal power, and the object side surface of the seventh lens is a concave surface; and
half of the diagonal line length of an effective pixel area on an imaging surface of the optical imaging system is ImgH, and the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system meet the requirement that ImgH/(f/EPD) is more than or equal to 2.4mm;
the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis meet 0.3 < ET6/CT6 < 0.7;
at least one of the mirrors of the first to seventh lenses is an aspherical mirror;
the number of lenses having optical power in the optical imaging system is seven.
2. The optical imaging system of claim 1, wherein a combined focal length f123 of the first lens, the second lens, and the third lens and a total effective focal length f of the optical imaging system satisfy 0.5 < f123/f < 1.5.
3. The optical imaging system of claim 1, wherein a radius of curvature R1 of the object side of the first lens and an effective focal length f1 of the first lens satisfy 0.2 < R1/f1 < 0.7.
4. The optical imaging system of claim 1, wherein the radius of curvature R4 of the image side of the second lens and the radius of curvature R3 of the object side of the second lens satisfy 0.3 < R4/R3 < 0.8.
5. The optical imaging system of claim 1, wherein a total effective focal length f of the optical imaging system, a combined focal length f45 of the fourth lens and the fifth lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy |f/f45|+|f/f67|+|0.6.
6. The optical imaging system according to claim 1, wherein a radius of curvature R9 of an object side surface of the fifth lens, a radius of curvature R10 of an image side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy 0 < (r9+r10)/|f5| < 0.7.
7. The optical imaging system of claim 1, wherein 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 1.2 < CT6/CT7 < 1.9.
8. The optical imaging system according to claim 5, wherein a radius of curvature R11 of the object side surface of the sixth lens, a radius of curvature R12 of the image side surface of the sixth lens, a radius of curvature R13 of the object side surface of the seventh lens, and a radius of curvature R14 of the image side surface of the seventh lens satisfy 0.4 +.ltoreq.r11+r12)/|r13-r14|+.2.4.
9. The optical imaging system of claim 1, wherein the maximum effective half-caliber DT51 of the object side of the fifth lens and the maximum effective half-caliber DT71 of the object side of the seventh lens satisfy 0.3 < DT51/DT71 < 0.7.
10. The optical imaging system according to any one of claims 1 to 9, wherein a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system and a half of a diagonal length ImgH of an effective pixel area on the imaging surface of the optical imaging system satisfy TTL/ImgH < 1.65.
11. The optical imaging system according to any one of claims 1 to 9, wherein a center thickness CT1 of the first lens on the optical axis and a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system satisfy 1.1 < CT1/TTL x 10 < 1.6.
12. 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 optical power;
the second lens has negative optical power;
the third lens has optical power;
the fourth lens has optical power;
the fifth lens has focal power, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive focal power, and both the object side surface and the image side surface of the sixth lens are convex;
the seventh lens has negative focal power, and the object side surface of the seventh lens is a concave surface; and
the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens meet 0.4-2.4 (R11+R12)/R13-R14;
the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis meet 0.3 < ET6/CT6 < 0.7;
at least one of the mirrors of the first to seventh lenses is an aspherical mirror;
the number of lenses having optical power in the optical imaging system is seven.
13. The optical imaging system of claim 12, wherein a radius of curvature R1 of the object side of the first lens and an effective focal length f1 of the first lens satisfy 0.2 < R1/f1 < 0.7.
14. The optical imaging system of claim 12, wherein the radius of curvature R4 of the image side of the second lens and the radius of curvature R3 of the object side of the second lens satisfy 0.3 < R4/R3 < 0.8.
15. The optical imaging system of claim 12, wherein a center thickness CT1 of the first lens on the optical axis and a distance TTL between an object side surface of the first lens and an imaging surface of the optical imaging system on the optical axis satisfy 1.1 < CT1/TTL x 10 < 1.6.
16. The optical imaging system of any of claims 13 to 15, wherein a combined focal length f123 of the first, second, and third lenses and a total effective focal length f of the optical imaging system satisfy 0.5 < f123/f < 1.5.
17. The optical imaging system according to claim 12, wherein a radius of curvature R9 of an object side surface of the fifth lens, a radius of curvature R10 of an image side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy 0 < (r9+r10)/|f5| < 0.7.
18. The optical imaging system of claim 12, wherein 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 1.2 < CT6/CT7 < 1.9.
19. The optical imaging system of claim 12, wherein the maximum effective half-caliber DT51 of the object side of the fifth lens and the maximum effective half-caliber DT71 of the object side of the seventh lens satisfy 0.3 < DT51/DT71 < 0.7.
20. The optical imaging system according to any one of claims 17 to 19, wherein a total effective focal length f of the optical imaging system, a combined focal length f45 of the fourth lens and the fifth lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy |f/f45|+|f/f67|+|0.6.
21. The optical imaging system of claim 12, wherein the effective pixel area on the imaging surface of the optical imaging system is half the diagonal length ImgH, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy ImgH/(f/EPD) > 2.4mm.
22. The optical imaging system of claim 12, wherein a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the optical imaging system and a half of a diagonal length ImgH of an effective pixel area on the imaging surface of the optical imaging system satisfy TTL/ImgH < 1.65.
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