CN107577034B - Image pickup lens - Google Patents

Image pickup lens Download PDF

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Publication number
CN107577034B
CN107577034B CN201711007882.4A CN201711007882A CN107577034B CN 107577034 B CN107577034 B CN 107577034B CN 201711007882 A CN201711007882 A CN 201711007882A CN 107577034 B CN107577034 B CN 107577034B
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lens
imaging
imaging lens
satisfy
optical axis
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CN107577034A (en
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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 CN201711007882.4A priority Critical patent/CN107577034B/en
Priority to CN202310397190.4A priority patent/CN116360082A/en
Publication of CN107577034A publication Critical patent/CN107577034A/en
Priority to PCT/CN2018/100471 priority patent/WO2019080610A1/en
Priority to US16/273,584 priority patent/US11029501B2/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

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

Abstract

The application discloses camera lens, this camera lens includes in proper order along the optical axis from the thing side to the image side: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens element with optical power having a convex object-side surface and a convex image-side surface; the object side surface of the seventh lens with negative focal power is a convex surface. The effective focal length of the second lens and the total effective focal length f of the imaging lens meet that f2/f < -1.5 is less than or equal to-3.

Description

Image pickup lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an imaging lens including seven lenses.
Background
With the improvement of the performance and the reduction of the size of common photosensitive elements such as a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS), the pixel number and the pixel size of the photosensitive elements are increased and reduced, so that higher requirements are put on the high imaging quality and the miniaturization of matched imaging lenses.
The reduction in the size of the picture element means that the light flux of the lens will be smaller in the same exposure time. However, under dim ambient conditions, the lens needs to have a large amount of light to ensure imaging quality. The conventional lenses are generally configured to have an f-number Fno (total effective focal length of the lens/entrance pupil diameter of the lens) of 2.0 or more. Although the lens can meet the miniaturization requirement, the imaging quality of the lens cannot be ensured under the conditions of insufficient light (such as rainy days, dusk and the like), hand shake and the like, and therefore, the lens with the f-number FNo of 2.0 or more than 2.0 cannot meet the higher-order imaging requirement.
Disclosure of Invention
The present application provides an imaging lens, e.g., a large aperture imaging lens, applicable to portable electronic products that can at least address or partially address at least one of the above-mentioned shortcomings of the prior art.
In one aspect, the present application provides an imaging lens including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The effective focal length of the second lens and the total effective focal length f of the imaging lens can meet that f2/f < -1.5 is less than or equal to-3.
In one embodiment, the total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens may satisfy f/EPD < 2.0.
In one embodiment, the total effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens may satisfy 1 < |f/f1|+|f/f2| < 1.55.
In one embodiment, the radius of curvature R2 of the image side of the first lens and the effective focal length f1 of the first lens may satisfy 1.3 < R2/f1 < 2.
In one embodiment, the sixth lens may have positive optical power; the effective focal length f6 of the sixth lens and the total optical length TTL of the imaging lens can satisfy 0.6 < f6/TTL < 1.3.
In one embodiment, the effective focal length f7 of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis may satisfy-5 < f7/CT7 < -4.
In one embodiment, the object side surface of the first lens may be convex; the total effective focal length f of the imaging lens and the curvature radius R1 of the object side surface of the first lens can satisfy the condition that f/R1 is more than 2 and less than 2.6.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R14 of the image-side surface of the seventh lens may satisfy 1 < R1/R14 < 1.5.
In one embodiment, the effective half-caliber DT11 of the object side surface of the first lens and the effective half-caliber DT51 of the object side surface of the fifth lens may satisfy 0.8 < DT11/DT51 < 1.2.
In one embodiment, the distance SAG71 between the intersection point of the object side surface of the seventh lens and the optical axis and the effective half-caliber vertex of the object side surface of the seventh lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis can satisfy-0.5 < SAG71/CT7 < 0.
In one embodiment, the total optical length TTL of the imaging lens and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the imaging lens may satisfy TTL/ImgH < 1.65.
In one embodiment, the center thickness CT3 of the third lens element and the center thickness CT4 of the fourth lens element may satisfy 1 < CT3/CT4 < 1.5.
In one embodiment, a center thickness CT4 of the fourth lens element on the optical axis and a center thickness CT5 of the fifth lens element on the optical axis may satisfy CT4/CT 5. Ltoreq.1.
In one embodiment, the distance T56 between the fifth lens element and the sixth lens element and the distance T67 between the sixth lens element and the seventh lens element satisfy 1.5 < T56/T67 < 3.2.
In another aspect, the present application provides an imaging lens including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The total effective focal length f of the imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens can meet the requirement that 1 < |f/f1|+|f/f2| < 1.55.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The effective focal length f6 of the sixth lens and the total optical length TTL of the imaging lens can meet the requirement that f6/TTL is more than 0.6 and less than 1.3.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The curvature radius R2 of the image side surface of the first lens and the effective focal length f1 of the first lens can satisfy 1.3 < R2/f1 < 2.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The curvature radius R1 of the object side surface of the first lens and the curvature radius R14 of the image side surface of the seventh lens can satisfy 1 < R1/R14 < 1.5.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The distance T56 between the fifth lens and the sixth lens and the distance T67 between the sixth lens and the seventh lens can satisfy 1.5 < T56/T67 < 3.2.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The effective half-caliber DT11 of the object side surface of the first lens and the effective half-caliber DT51 of the object side surface of the fifth lens can meet the conditions that DT11/DT51 is smaller than 0.8 and smaller than 1.2.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power; a third lens having optical power; a fourth lens having optical power; a fifth lens having optical power; the object side surface of the sixth lens element with optical power can be a convex surface, and the image side surface of the sixth lens element can be a convex surface; the object side surface of the seventh lens with negative focal power can be a convex surface. The distance SAG71 between the intersection point of the object side surface of the seventh lens and the optical axis and the effective half-caliber vertex of the object side surface of the seventh lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis can satisfy-0.5 < SAG71/CT7 < 0.
The imaging lens has at least one beneficial effect of ultra-thin, miniaturized, large aperture, high imaging quality and the like by reasonably distributing the focal power, the surface shape, the center 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 imaging lens 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 imaging lens of embodiment 1;
fig. 3 shows a schematic configuration diagram of an imaging lens 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 imaging lens of embodiment 2;
fig. 5 shows a schematic configuration diagram of an imaging lens 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 imaging lens of embodiment 3;
Fig. 7 shows a schematic configuration diagram of an imaging lens 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 imaging lens of embodiment 4;
fig. 9 shows a schematic configuration diagram of an imaging lens 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 imaging lens of embodiment 5;
fig. 11 shows a schematic configuration diagram of an imaging lens 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 imaging lens of embodiment 6;
fig. 13 shows a schematic configuration diagram of an imaging lens 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 imaging lens of embodiment 7;
fig. 15 shows a schematic configuration diagram of an imaging lens 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 of the imaging lens of embodiment 8, respectively.
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 imaging lens 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 imaging lens of the present application may satisfy the condition that f/EPD < 2.0, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens. More specifically, f and EPD may further satisfy f/EPD < 1.9, e.g., 1.51.ltoreq.f/EPD.ltoreq.1.87. The smaller the ratio of the total effective focal length f of the imaging lens to the entrance pupil diameter EPD, the larger the clear aperture of the lens, and the more the amount of light entering in the same unit time. The lens is configured to meet the condition that f/EPD is smaller than 2.0, so that the lens has the advantage of a larger aperture, the light flux of the system can be increased, and the imaging effect in a dark environment is enhanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that f2/f is less than or equal to-3 and less than or equal to-1.5, where f2 is an effective focal length of the second lens, and f is a total effective focal length of the imaging lens. More specifically, f2 and f may further satisfy-3.ltoreq.f2/f < -2.1, for example, -2.97.ltoreq.f2/f.ltoreq.2.19. The focal power of the second lens is reasonably distributed, so that the optical total length of the lens can be effectively shortened, and the ultrathin characteristic of the lens is ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 1 < |f/f1|+|f/f2| < 1.55, where f is the total effective focal length of the imaging lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. More specifically, f1 and f2 may further satisfy 1.20 < |f/f1|+|f/f2| < 1.55, e.g., 1.25+|f/f 1|+|f/f 2|+|1.51. The optical power of the first lens and the optical power of the second lens are reasonably distributed, so that the optical deflection angle can be reduced, and the sensitivity of the imaging system is further reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.6 < f6/TTL < 1.3, where f6 is an effective focal length of the sixth lens element, and TTL is an optical total length of the imaging lens element (i.e., a distance on an optical axis from a center of an object side surface of the first lens element to an imaging surface of the imaging lens element). More specifically, f6 and TTL can further satisfy 0.6 < f6/TTL < 0.8, for example, 0.69.ltoreq.f6/TTL.ltoreq.0.78. The ratio of f6 to TTL is reasonably controlled, so that the imaging system can meet the requirement of compact size.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that TTL/ImgH < 1.65, where TTL is the total optical length of the imaging lens and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens. More specifically, TTL and ImgH can further satisfy 1.37.ltoreq.TTL/ImgH.ltoreq.1.54. The conditional TTL/ImgH is smaller than 1.65, the size of the imaging system can be effectively compressed, and the miniaturization characteristic of the lens is ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 2 < f/R1 < 2.6, where f is the total effective focal length of the imaging lens, and R1 is the radius of curvature of the object side surface of the first lens. More specifically, f and R1 may further satisfy 2.06.ltoreq.f/R1.ltoreq.2.51. The curvature radius of the first lens is reasonably arranged, so that the aberration of the imaging system can be easily balanced, and the optical performance of the imaging system is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1.3 < R2/f1 < 2, where R2 is a radius of curvature of an image side surface of the first lens, and f1 is an effective focal length of the first lens. More specifically, R2 and f1 may further satisfy 1.4 < R2/f1 < 1.9, for example, 1.48.ltoreq.R2/f 1.ltoreq.1.82. By reasonably controlling the ratio of R2 to f1, the deflection angle of the marginal view field light ray at the first lens can be effectively controlled, and the sensitivity of the system can be effectively reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1 < R1/R14 < 1.5, where R1 is a radius of curvature of an object side surface of the first lens element, and R14 is a radius of curvature of an image side surface of the seventh lens element. More specifically, R1 and R14 may further satisfy 1.10.ltoreq.R1/R14 < 1.40, for example, 1.10.ltoreq.R1/R14.ltoreq.1.31. The ratio of R1 to R14 is reasonably controlled, so that the aberration of the imaging system can be effectively balanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition-5 < f7/CT7 < -4, where f7 is an effective focal length of the seventh lens and CT7 is a center thickness of the seventh lens on the optical axis. More specifically, f7 and CT7 may further satisfy-4.6 < f7/CT7 < -4.3, for example, -4.55.ltoreq.f7/CT 7.ltoreq.4.35. The ratio of f7 to CT7 is reasonably controlled, so that the size of the rear end of the imaging system can be effectively reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that 1 < CT3/CT4 < 1.5, where CT3 is a central thickness of the third lens element on the optical axis, and CT4 is a central thickness of the fourth lens element on the optical axis. More specifically, CT3 and CT4 may further satisfy 1.1 < CT3/CT4 < 1.4, for example, 1.14. Ltoreq.CT3/CT 4. Ltoreq.1.37. The center thickness of the third lens and the center thickness of the fourth lens are reasonably controlled, and the processability of the third lens and the spherical aberration contribution rate of the fourth lens can be ensured, so that an on-axis view field area of the imaging system has good imaging quality.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1.5 < T56/T67 < 3.2, where T56 is a distance between the fifth lens element and the sixth lens element on the optical axis, and T67 is a distance between the sixth lens element and the seventh lens element on the optical axis. More specifically, T56 and T67 may further satisfy 1.9 < T56/T67 < 3.2, e.g., 1.91.ltoreq.T56/T67.ltoreq.3.11. The axial spacing distance of the fifth lens, the sixth lens and the seventh lens is reasonably controlled, so that good machining clearance of the imaging system is guaranteed, and good light path deflection in the imaging system is guaranteed.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression CT4/CT 5+.1, where CT4 is the center thickness of the fourth lens element on the optical axis, and CT5 is the center thickness of the fifth lens element on the optical axis. More specifically, CT4 and CT5 may further satisfy 0 < CT4/CT 5.ltoreq.1, and still further, CT4 and CT5 may satisfy 0.50.ltoreq.CT 4/CT 5.ltoreq.1, for example, 0.50.ltoreq.CT 4/CT 5.ltoreq.0.99. The center thicknesses of the fourth lens and the fifth lens are reasonably controlled, so that the processability of the fourth lens and the spherical aberration contribution rate of the fifth lens can be ensured, and an on-axis view field area of the imaging system has good imaging quality.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.8 < DT11/DT51 < 1.2, where DT11 is an effective half-caliber of the object side surface of the first lens element, and DT51 is an effective half-caliber of the object side surface of the fifth lens element. More specifically, DT11 and DT51 may further satisfy 0.9 < DT11/DT51 < 1.1, e.g., 0.97. Ltoreq.DT 11/DT 51. Ltoreq.1.05. By reasonably controlling the effective half calibers of the first lens and the fifth lens object side surface, the deflection angles of the edge view fields at the first lens and the fifth lens can be reasonably controlled, and the sensitivity of an imaging system can be effectively reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression-0.5 < SAG71/CT7 < 0, where SAG71 is a distance between an intersection point of an object side surface of the seventh lens and an optical axis and an effective half-caliber vertex of the object side surface of the seventh lens on the optical axis, and CT7 is a center thickness of the seventh lens on the optical axis. More specifically, SAG71 and CT7 may further satisfy-0.5 < SAG71/CT7 < -0.1, for example, -0.45. Ltoreq.SAG 71/CT 7. Ltoreq.0.19. By reasonably controlling the ratio of SAG71 to CT7, the third-order coma of the seventh lens can be controlled within a reasonable range, so that the coma generated by the seventh lens can be used to balance the amount of coma generated by the front-end lenses (i.e., from the object side to the seventh lens), thereby enabling the imaging system to have good imaging quality.
In an exemplary embodiment, the photographing lens may further include at least one diaphragm to improve an imaging quality of the lens. 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 first lens and the second lens.
Optionally, the above-mentioned image pickup lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The imaging lens according to the above embodiment of the present application may employ a plurality of lenses, such as seven lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the camera lens is more beneficial to production and processing and is applicable to portable electronic products. Meanwhile, the imaging lens configured as described above has 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, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example in the embodiment, the imaging lens is not limited to include seven lenses. The camera lens may also include other numbers of lenses, if desired.
Specific examples of the imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An imaging lens 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 imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 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 L4 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 L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000111
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 L1 to the seventh lens L7 are aspherical surfaces. 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 BDA0001444836110000121
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 -3.2510E-02 2.7649E-01 -1.1950E+00 2.9877E+00 -4.6362E+00 4.4974E+00 -2.6599E+00 8.7574E-01 -1.2323E-01
S2 -4.2699E-02 -5.2153E-01 3.6451E+00 -1.2234E+01 2.4201E+01 -2.9422E+01 2.1581E+01 -8.7654E+00 1.5141E+00
S3 -2.0269E-01 1.0594E+00 -5.6930E+00 2.0993E+01 -4.8444E+01 6.9649E+01 -6.0599E+01 2.9193E+01 -5.9756E+00
S4 -2.6261E-02 -8.8568E-01 8.4026E+00 -3.8786E+01 1.0835E+02 -1.8811E+02 1.9826E+02 -1.1609E+02 2.8978E+01
S5 -5.1076E-02 1.0895E+00 -8.6595E+00 3.7846E+01 -1.0212E+02 1.7180E+02 -1.7598E+02 1.0054E+02 -2.4538E+01
S6 -1.2113E-01 6.2936E-01 -3.5422E+00 1.2074E+01 -2.7558E+01 4.1451E+01 -3.9979E+01 2.2573E+01 -5.6093E+00
S7 -2.8963E-01 1.5154E+00 -7.2490E+00 2.0903E+01 -3.8121E+01 4.3966E+01 -3.1651E+01 1.3359E+01 -2.5698E+00
S8 -6.2172E-01 2.7484E+00 -9.8942E+00 2.3201E+01 -3.5125E+01 3.3444E+01 -1.9163E+01 5.9476E+00 -7.4437E-01
S9 6.7447E-03 -8.1883E-01 2.6274E+00 -4.9504E+00 6.3252E+00 -5.4795E+00 2.9656E+00 -8.7877E-01 1.0730E-01
S10 -7.0290E-02 -2.4344E-01 4.9701E-01 -5.2363E-01 5.3066E-01 -5.3210E-01 3.4405E-01 -1.1352E-01 1.4655E-02
S11 5.3341E-02 1.1931E-01 -3.8251E-01 2.9748E-01 -5.1412E-02 -8.9953E-02 7.6338E-02 -2.5020E-02 3.0989E-03
S12 3.7899E-02 4.0393E-01 -6.7321E-01 5.1170E-01 -2.2628E-01 6.1508E-02 -1.0192E-02 9.4969E-04 -3.8218E-05
S13 -4.5666E-02 -1.2536E-01 2.0002E-01 -1.1851E-01 3.7082E-02 -6.6831E-03 6.9106E-04 -3.7373E-05 7.8434E-07
S14 -1.1549E-01 5.8679E-02 -2.8312E-02 1.2142E-02 -4.4883E-03 1.1728E-03 -1.8695E-04 1.6097E-05 -5.7253E-07
TABLE 2
Table 3 gives the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens (i.e., the distance on the optical axis from the center of the object side surface S1 of the first lens L1 to the imaging surface S17), and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 1.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.33 3.89 -8.56 15.59 -35.36
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value 19.56 3.50 -2.91 4.50 2.93
TABLE 3 Table 3
The imaging lens in embodiment 1 satisfies:
f/epd=1.51, where f is the total effective focal length of the imaging lens, EPD is the entrance pupil diameter of the imaging lens;
f2/f= -2.57, wherein f2 is the effective focal length of the second lens L2, and f is the total effective focal length of the imaging lens;
i f/f1 i+|f/f 2 i=1.25, where f is the total effective focal length of the imaging lens, f1 is the effective focal length of the first lens L1, and f2 is the effective focal length of the second lens L2;
f6/ttl=0.78, where f6 is the effective focal length of the sixth lens L6, and TTL is the optical total length of the imaging lens;
TTL/imgh=1.54, where TTL is the optical total length of the imaging lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface S17;
fr1=2.06, where f is the total effective focal length of the imaging lens, and R1 is the radius of curvature of the object side surface S1 of the first lens L1;
r2/f1=1.50, where R2 is a radius of curvature of the image side surface S2 of the first lens L1, and f1 is an effective focal length of the first lens L1;
r1/r14=1.10, where R1 is a radius of curvature of the object side surface S1 of the first lens element L1, and R14 is a radius of curvature of the image side surface S14 of the seventh lens element L7;
f7/CT 7= -4.55, where f7 is the effective focal length of the seventh lens L7, and CT7 is the center thickness of the seventh lens L7 on the optical axis;
CT3/CT4 = 1.14, wherein CT3 is the center thickness of the third lens L3 on the optical axis, and CT4 is the center thickness of the fourth lens L4 on the optical axis;
t56/t67=2.18, where T56 is the distance between the fifth lens L5 and the sixth lens L6 on the optical axis, and T67 is the distance between the sixth lens L6 and the seventh lens L7 on the optical axis;
CT 4/ct5=0.99, wherein CT4 is the center thickness of the fourth lens L4 on the optical axis, and CT5 is the center thickness of the fifth lens L5 on the optical axis;
DT11/DT51 = 1.00, wherein DT11 is the effective half-caliber of the object side surface S1 of the first lens L1, and DT51 is the effective half-caliber of the object side surface S9 of the fifth lens L5;
SAG71/CT7 = -0.19, where SAG71 is the distance between the intersection point of the object side surface S13 of the seventh lens L7 and the optical axis and the effective half-caliber vertex of the object side surface S13 of the seventh lens L7 on the optical axis, and CT7 is the center thickness of the seventh lens L7 on the optical axis.
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve of the imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values in the case of different angles of view. Fig. 2D shows a magnification chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the imaging lens provided in embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens 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 imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 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 L4 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 L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 2, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000141
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Figure BDA0001444836110000151
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 L1 to the seventh lens L7 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 -1.3930E-02 1.2714E-01 -5.1925E-01 1.2275E+00 -1.8043E+00 1.6424E+00 -9.0159E-01 2.6848E-01 -3.3011E-02
S2 -5.6505E-02 -1.7634E-01 1.3081E+00 -4.2093E+00 7.9293E+00 -9.1646E+00 6.3562E+00 -2.4237E+00 3.9005E-01
S3 -1.6659E-01 4.1678E-01 -1.5096E+00 5.4679E+00 -1.2747E+01 1.8307E+01 -1.5731E+01 7.4238E+00 -1.4767E+00
S4 -3.8892E-02 -5.2915E-01 5.7519E+00 -2.8088E+01 8.3374E+01 -1.5413E+02 1.7297E+02 -1.0777E+02 2.8618E+01
S5 3.8886E-03 1.9758E-01 -2.2826E+00 1.0874E+01 -3.1706E+01 5.7209E+01 -6.2577E+01 3.8013E+01 -9.8046E+00
S6 -3.8996E-02 8.6322E-02 -1.1008E+00 5.5385E+00 -1.7730E+01 3.4625E+01 -4.0406E+01 2.5925E+01 -6.9715E+00
S7 -2.0249E-01 4.0417E-01 -2.3143E+00 8.5850E+00 -2.1305E+01 3.4109E+01 -3.4337E+01 1.9915E+01 -5.0068E+00
S8 -2.2043E-01 3.4174E-02 6.8110E-01 -3.4629E+00 8.7129E+00 -1.3417E+01 1.2462E+01 -6.3563E+00 1.3696E+00
S9 -1.4656E-01 -8.8763E-02 4.2818E-01 -6.8469E-01 7.0294E-01 -6.5986E-01 4.8562E-01 -2.1200E-01 4.0018E-02
S10 -9.2762E-02 -1.7742E-01 4.2695E-01 -4.7926E-01 3.7452E-01 -2.5014E-01 1.2912E-01 -3.8932E-02 4.8109E-03
S11 1.3903E-01 -1.7691E-01 6.6168E-02 -4.5795E-02 3.5943E-02 -1.3582E-02 6.3155E-05 1.3660E-03 -2.5829E-04
S12 8.1625E-02 2.4137E-01 -4.6845E-01 3.8114E-01 -1.8008E-01 5.2536E-02 -9.3893E-03 9.4866E-04 -4.1631E-05
S13 -1.1350E-01 5.6420E-02 1.9490E-02 -2.4697E-02 8.8729E-03 -1.6480E-03 1.7235E-04 -9.6759E-06 2.2795E-07
S14 -8.6430E-02 4.0138E-02 -1.2190E-02 1.1359E-03 4.9128E-04 -1.8384E-04 2.6278E-05 -1.7702E-06 4.6443E-08
TABLE 5
Table 6 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 2.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.80 3.75 -8.52 14.07 -111.75
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -448.40 3.48 -2.46 4.69 3.41
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values in the case of different angles of view. Fig. 4D shows a magnification chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens provided in embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens 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 imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 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 L4 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 L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 3, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000171
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 L1 to the seventh lens L7 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.
Figure BDA0001444836110000172
Figure BDA0001444836110000181
TABLE 8
Table 9 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 3.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.95 3.76 -8.63 12.54 -44.52
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -635.02 3.54 -2.43 4.76 3.41
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values in the case of different angles of view. Fig. 6D shows a magnification chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens provided in embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens 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 imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 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 L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex; the fifth lens element L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 4, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000191
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 L1 to the seventh lens L7 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.
Figure BDA0001444836110000192
Figure BDA0001444836110000201
TABLE 11
Table 12 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 4.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.74 3.64 -8.22 15.31 76.39
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -43.13 3.15 -2.30 4.56 3.08
Table 12
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 8B shows an astigmatism curve of the imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values in the case of different angles of view. Fig. 8D shows a magnification chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens provided in embodiment 4 can achieve good imaging quality.
Example 5
An imaging lens 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 imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 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 L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex; the fifth lens element L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 5, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000211
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 L1 to the seventh lens L7 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 6.0551E-04 3.0026E-02 -1.1089E-01 2.2595E-01 -2.6806E-01 1.5227E-01 -6.5149E-03 -3.9346E-02 1.3378E-02
S2 -5.2015E-02 -7.1564E-02 3.8739E-01 -9.9658E-01 1.6662E+00 -1.8460E+00 1.2664E+00 -4.8169E-01 7.7113E-02
S3 -1.1495E-01 3.2475E-02 1.7174E-01 1.1787E-01 -1.1378E+00 2.1560E+00 -2.0803E+00 1.0824E+00 -2.4113E-01
S4 -2.8264E-02 -1.9850E-01 1.8803E+00 -8.5804E+00 2.6411E+01 -5.2230E+01 6.3462E+01 -4.3093E+01 1.2619E+01
S5 3.0428E-02 -4.1536E-01 1.9552E+00 -9.4253E+00 2.9910E+01 -5.9589E+01 7.2047E+01 -4.8233E+01 1.3780E+01
S6 1.4904E-02 -5.5515E-01 2.4919E+00 -9.6007E+00 2.4377E+01 -3.9502E+01 3.9500E+01 -2.2203E+01 5.3444E+00
S7 -1.6130E-01 4.7353E-02 -2.0712E+00 1.0179E+01 -2.7196E+01 4.3871E+01 -4.1925E+01 2.1379E+01 -4.3400E+00
S8 -1.0893E-01 -2.3527E-01 3.3539E-01 -3.9584E-01 1.0267E+00 -2.0499E+00 2.2162E+00 -1.3147E+00 3.6598E-01
S9 -8.5152E-02 -1.6386E-01 4.5281E-01 -1.1069E+00 2.3641E+00 -3.2289E+00 2.5055E+00 -1.0116E+00 1.6667E-01
S10 -9.7417E-02 -1.5208E-01 4.2939E-01 -9.3997E-01 1.6612E+00 -1.8806E+00 1.2458E+00 -4.3945E-01 6.3755E-02
S11 1.4509E-01 -1.5861E-01 1.0665E-01 -2.0310E-01 2.4658E-01 -1.7022E-01 6.8455E-02 -1.4809E-02 1.3191E-03
S12 1.3331E-01 1.6545E-01 -3.8250E-01 2.9365E-01 -1.1728E-01 2.5184E-02 -2.5474E-03 4.5267E-05 7.0686E-06
S13 -1.0207E-01 2.6699E-02 6.4830E-03 1.9414E-02 -2.1403E-02 8.4021E-03 -1.6344E-03 1.5996E-04 -6.3221E-06
S14 -9.0439E-02 4.5947E-02 -2.1362E-02 8.8635E-03 -3.0540E-03 7.5309E-04 -1.1683E-04 9.9840E-06 -3.5534E-07
TABLE 14
Table 15 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 5.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.75 3.58 -8.90 18.59 90.70
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -75.56 3.19 -2.27 4.56 3.08
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values in the case of different angles of view. Fig. 10D shows a magnification chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens provided in embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave; the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex; the fifth lens element L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 6, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000231
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 L1 to the seventh lens L7 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 -9.7750E-04 4.0207E-02 -1.6732E-01 4.0534E-01 -6.2409E-01 5.9325E-01 -3.3700E-01 9.7385E-02 -1.0367E-02
S2 -5.1596E-02 -5.2802E-02 1.4964E-01 -1.0663E-01 -1.1388E-01 2.9461E-01 -2.7885E-01 1.3525E-01 -2.7625E-02
S3 -9.9317E-02 6.6921E-03 -2.2974E-02 1.0298E+00 -2.9027E+00 3.9373E+00 -2.9243E+00 1.1447E+00 -1.8395E-01
S4 -4.6002E-03 -2.2266E-01 1.6017E+00 -6.7565E+00 2.0360E+01 -3.9805E+01 4.7813E+01 -3.2071E+01 9.3116E+00
S5 5.0687E-02 -3.6169E-01 1.4000E+00 -6.2971E+00 1.9705E+01 -3.9078E+01 4.7041E+01 -3.1292E+01 8.8904E+00
S6 -8.3882E-03 -5.0086E-01 2.0204E+00 -7.0682E+00 1.6503E+01 -2.4771E+01 2.2834E+01 -1.1746E+01 2.5662E+00
S7 -1.7231E-01 -1.2135E-01 -9.7132E-01 5.7184E+00 -1.6533E+01 2.8818E+01 -3.0188E+01 1.7136E+01 -3.9335E+00
S8 -1.0387E-01 -2.7680E-01 6.6994E-01 -1.7038E+00 4.0119E+00 -6.0709E+00 5.2413E+00 -2.4008E+00 4.8321E-01
S9 -9.9993E-02 -9.5016E-02 3.4788E-01 -8.3128E-01 1.8253E+00 -2.6351E+00 2.1360E+00 -8.9462E-01 1.5269E-01
S10 -1.1673E-01 -8.0658E-02 3.0430E-01 -6.6320E-01 1.1636E+00 -1.3156E+00 8.6310E-01 -2.9873E-01 4.2204E-02
S11 1.0958E-01 -9.7921E-02 1.5330E-02 -5.8817E-02 8.9526E-02 -6.8385E-02 3.0766E-02 -7.5162E-03 7.5527E-04
S12 1.3582E-01 8.6344E-02 -2.0942E-01 1.1631E-01 -1.1783E-02 -1.3652E-02 6.2368E-03 -1.0787E-03 6.9402E-05
S13 -1.0932E-01 4.0235E-02 -3.8002E-03 2.4754E-02 -2.3902E-02 9.3236E-03 -1.8475E-03 1.8629E-04 -7.6428E-06
S14 -8.1176E-02 3.0950E-02 -6.1060E-03 -6.2063E-04 5.9247E-04 -1.1205E-04 5.7468E-06 5.2076E-07 -5.0079E-08
TABLE 17
Table 18 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 6.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.75 3.62 -11.11 -164.83 16.06
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -61.38 3.18 -2.22 4.56 3.08
TABLE 18
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the imaging lens of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values in the case of different angles of view. Fig. 12D shows a magnification chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens provided in embodiment 6 can achieve good imaging quality.
Example 7
An imaging lens 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 imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave; the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex; the fifth lens element L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 7, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000251
Figure BDA0001444836110000261
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 L1 to the seventh lens L7 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -2.9470E-03 5.9079E-02 -2.5000E-01 6.2731E-01 -9.9866E-01 9.9127E-01 -5.9416E-01 1.8909E-01 -2.4187E-02
S2 -5.1916E-02 -7.9253E-02 3.2517E-01 -6.7064E-01 9.9558E-01 -1.0750E+00 7.4648E-01 -2.8833E-01 4.6252E-02
S3 -9.6307E-02 -2.2559E-02 1.6668E-01 2.7814E-01 -9.5164E-01 6.5020E-01 4.8869E-01 -8.2445E-01 2.9723E-01
S4 7.5238E-04 -2.8121E-01 1.9946E+00 -8.5449E+00 2.5497E+01 -4.9030E+01 5.7892E+01 -3.8216E+01 1.0922E+01
S5 5.9919E-02 -4.6251E-01 2.0732E+00 -9.5739E+00 2.9957E+01 -5.9051E+01 7.0639E+01 -4.6790E+01 1.3227E+01
S6 -1.0006E-03 -5.5019E-01 2.2064E+00 -7.6114E+00 1.7336E+01 -2.4846E+01 2.1435E+01 -1.0157E+01 2.0163E+00
S7 -1.7164E-01 -6.8875E-02 -1.5239E+00 8.8392E+00 -2.7340E+01 5.1518E+01 -5.8119E+01 3.5575E+01 -8.9622E+00
S8 -1.0826E-01 -2.4999E-01 5.5310E-01 -1.2089E+00 2.3812E+00 -2.6946E+00 1.1908E+00 1.6468E-01 -1.7714E-01
S9 -1.0231E-01 -1.0716E-01 4.4050E-01 -1.0656E+00 2.1325E+00 -2.8383E+00 2.1695E+00 -8.6343E-01 1.3984E-01
S10 -1.1812E-01 -8.4912E-02 3.3588E-01 -7.3397E-01 1.2420E+00 -1.3608E+00 8.7432E-01 -2.9832E-01 4.1691E-02
S11 1.1117E-01 -1.0299E-01 3.1637E-02 -9.2358E-02 1.2846E-01 -9.6552E-02 4.3389E-02 -1.0669E-02 1.0862E-03
S12 1.3597E-01 8.7825E-02 -2.0684E-01 1.0616E-01 -9.9885E-04 -1.9335E-02 7.8772E-03 -1.3275E-03 8.4934E-05
S13 -1.1203E-01 4.3991E-02 -7.9466E-03 2.8601E-02 -2.6171E-02 1.0111E-02 -2.0052E-03 2.0337E-04 -8.4222E-06
S14 -8.7772E-02 4.1321E-02 -1.5802E-02 4.9293E-03 -1.4134E-03 3.4692E-04 -5.8639E-05 5.5700E-06 -2.1932E-07
Table 20
Table 21 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 7.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.74 3.52 -10.13 -91.00 14.41
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -53.16 3.18 -2.21 4.56 3.08
Table 21
Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the imaging lens of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the imaging lens of embodiment 7, which represents distortion magnitude values in the case of different angles of view. Fig. 14D shows a magnification chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the imaging lens provided in embodiment 7 can achieve good imaging quality.
Example 8
An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter L8, and an imaging surface S17.
The first lens element L1 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 L2 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 L3 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 L4 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 L5 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 L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter L8 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 8, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001444836110000271
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Figure BDA0001444836110000281
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 L1 to the seventh lens L7 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 -2.6924E-04 2.3538E-02 -9.1561E-02 1.7250E-01 -1.7724E-01 5.9275E-02 4.2443E-02 -4.6119E-02 1.1788E-02
S2 -5.9832E-02 -5.3346E-02 5.0247E-01 -1.6029E+00 2.9824E+00 -3.4314E+00 2.3725E+00 -9.0107E-01 1.4411E-01
S3 -1.2687E-01 1.3952E-01 -1.5064E-01 6.3880E-01 -1.5929E+00 2.1472E+00 -1.5790E+00 5.7943E-01 -7.4494E-02
S4 -4.7959E-02 -1.5015E-01 2.0399E+00 -9.8116E+00 2.9470E+01 -5.5661E+01 6.4059E+01 -4.0999E+01 1.1211E+01
S5 2.2387E-02 -6.1593E-02 -7.3586E-02 1.4619E-01 -8.5956E-02 -3.9472E-01 9.2848E-01 -9.1225E-01 4.0034E-01
S6 -2.4768E-02 8.1096E-02 -9.4703E-01 4.1510E+00 -1.2010E+01 2.1711E+01 -2.3740E+01 1.4330E+01 -3.6156E+00
S7 -1.9208E-01 1.7248E-01 -7.0573E-01 2.2699E+00 -5.8586E+00 1.0269E+01 -1.1283E+01 6.9697E+00 -1.7999E+00
S8 -2.0784E-01 3.2467E-02 4.1429E-01 -2.0952E+00 4.9244E+00 -6.9770E+00 6.0050E+00 -2.8855E+00 5.9857E-01
S9 -1.5260E-01 9.2261E-03 1.8748E-01 -3.8625E-01 3.7583E-01 -2.7475E-01 1.7680E-01 -8.7842E-02 2.1089E-02
S10 -1.1501E-01 -9.6273E-02 2.7807E-01 -3.1465E-01 2.1157E-01 -9.3141E-02 2.5998E-02 -3.7703E-03 1.5132E-04
S11 1.1522E-01 -1.9703E-01 1.9607E-02 2.0622E-01 -3.5859E-01 3.0580E-01 -1.4551E-01 3.7077E-02 -3.9830E-03
S12 1.8518E-01 -6.5478E-02 -3.9937E-02 2.8295E-02 4.4322E-03 -9.1505E-03 3.3577E-03 -5.3362E-04 3.2427E-05
S13 -1.3328E-01 5.0363E-02 4.6496E-02 -4.2917E-02 1.4792E-02 -2.7335E-03 2.8761E-04 -1.6315E-05 3.8904E-07
S14 -9.2011E-02 4.1673E-02 -1.0094E-02 -8.4478E-04 1.2182E-03 -3.2699E-04 4.2417E-05 -2.7586E-06 7.2048E-08
Table 23
Table 24 shows the total effective focal length f of the imaging lens, the effective focal lengths f1 to f7 of the respective lenses, the total optical length TTL of the imaging lens, and half the diagonal length ImgH of the effective pixel region on the imaging surface S17 in embodiment 8.
Parameters (parameters) f(mm) f1(mm) f2(mm) f3(mm) f4(mm)
Numerical value 3.95 3.85 -9.02 12.03 -69.00
Parameters (parameters) f5(mm) f6(mm) f7(mm) TTL(mm) ImgH(mm)
Numerical value -43.80 3.59 -2.49 4.76 3.41
Table 24
Fig. 16A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 8, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 16B shows an astigmatism curve of the imaging lens of embodiment 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the imaging lens of embodiment 8, which represents distortion magnitude values in the case of different angles of view. Fig. 16D shows a magnification chromatic aberration curve of the imaging lens of embodiment 8, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 16A to 16D, the imaging lens provided in embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 25 below.
Conditional\embodiment 1 2 3 4 5 6 7 8
f/EPD 1.51 1.75 1.87 1.72 1.73 1.74 1.74 1.83
f2/f -2.57 -2.24 -2.19 -2.20 -2.38 -2.97 -2.71 -2.29
|f/f1|+|f/f2| 1.25 1.46 1.51 1.48 1.47 1.37 1.43 1.46
f6/TTL 0.78 0.74 0.74 0.69 0.70 0.70 0.70 0.76
TTL/ImgH 1.54 1.37 1.40 1.48 1.48 1.48 1.48 1.40
f/R1 2.06 2.42 2.51 2.44 2.47 2.45 2.44 2.48
R2/f1 1.50 1.52 1.52 1.57 1.60 1.58 1.82 1.48
R1/R14 1.10 1.25 1.26 1.28 1.29 1.30 1.31 1.23
f7/CT7 -4.55 -4.39 -4.35 -4.41 -4.52 -4.53 -4.51 -4.45
CT3/CT4 1.14 1.37 1.36 1.36 1.34 1.34 1.34 1.35
T56/T67 2.18 2.40 3.11 2.27 2.74 3.09 3.11 1.91
CT4/CT5 0.99 0.71 0.57 0.81 0.80 0.81 0.79 0.50
DT11/DT51 1.00 0.99 0.97 1.02 1.03 1.05 1.05 0.97
SAG71/CT7 -0.19 -0.30 -0.31 -0.41 -0.34 -0.45 -0.44 -0.36
Table 25
The present application also provides an image pickup apparatus, in which the electron photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The image pickup apparatus may be a stand-alone image pickup device such as a digital camera, or may be an image pickup module integrated on a mobile electronic device such as a cellular phone, a tablet computer, or the like. The image pickup apparatus is equipped with the image pickup lens 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 (26)

1. The imaging lens is characterized by sequentially comprising, from an object side to an image side along an optical axis:
The first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens having negative optical power, the image side surface of which is concave;
a third lens having optical power;
a fourth lens having optical power;
a fifth lens having optical power;
a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
wherein the number of lenses having optical power in the imaging lens is seven;
the effective focal length of the second lens and the total effective focal length f of the imaging lens meet the condition that f2/f is less than or equal to-3 and less than or equal to-1.5; and
the interval distance T56 between the fifth lens and the sixth lens on the optical axis and the interval distance T67 between the sixth lens and the seventh lens on the optical axis satisfy 1.5 < T56/T67 < 3.2.
2. The imaging lens of claim 1, wherein a total effective focal length f of the imaging lens and an entrance pupil diameter EPD of the imaging lens satisfy f/EPD < 2.0.
3. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens, an effective focal length f1 of the first lens, and an effective focal length f2 of the second lens satisfy 1 < |f/f1|+|f/f2| < 1.55.
4. The imaging lens according to claim 1, wherein a radius of curvature R2 of an image side surface of the first lens and an effective focal length f1 of the first lens satisfy 1.3 < R2/f1 < 2.
5. The imaging lens according to claim 1, wherein an effective focal length f6 of the sixth lens and an optical total length TTL of the imaging lens satisfy 0.6 < f6/TTL < 1.3.
6. The imaging lens as claimed in claim 1, wherein an effective focal length f7 of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy-5 < f7/CT7 < -4.
7. The imaging lens system according to claim 1, wherein an object side surface of the first lens element is convex;
the total effective focal length f of the imaging lens and the curvature radius R1 of the object side surface of the first lens satisfy 2 < f/R1 < 2.6.
8. The imaging lens according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy 1 < R1/R14 < 1.5.
9. The imaging lens according to claim 1, wherein an effective half-diameter DT11 of an object side surface of the first lens and an effective half-diameter DT51 of an object side surface of the fifth lens satisfy 0.8 < DT11/DT51 < 1.2.
10. The imaging lens according to claim 1, wherein a distance SAG71 between an intersection point of the object side surface of the seventh lens and the optical axis and an effective half-caliber vertex of the object side surface of the seventh lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy-0.5 < SAG71/CT7 < 0.
11. The imaging lens according to any one of claims 1 to 10, wherein a total optical length TTL of the imaging lens and a half of a diagonal length ImgH of an effective pixel area on an imaging surface of the imaging lens satisfy TTL/ImgH < 1.65.
12. The imaging lens as claimed in claim 11, wherein a center thickness CT3 of the third lens element on the optical axis and a center thickness CT4 of the fourth lens element on the optical axis satisfy 1 < CT3/CT4 < 1.5.
13. The imaging lens as claimed in claim 11, wherein a center thickness CT4 of the fourth lens element on the optical axis and a center thickness CT5 of the fifth lens element on the optical axis satisfy CT4/CT5 being less than or equal to 1.
14. The imaging lens is characterized by sequentially comprising, from an object side to an image side along an optical axis:
the first lens with positive focal power has a convex object side surface and a concave image side surface;
A second lens having negative optical power, the image side surface of which is concave;
a third lens having optical power;
a fourth lens having optical power;
a fifth lens having optical power;
a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
wherein the number of lenses having optical power in the imaging lens is seven;
the total effective focal length f of the imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens meet 1 < |f/f1|+|f/f2| < 1.55; and
the interval distance T56 between the fifth lens and the sixth lens on the optical axis and the interval distance T67 between the sixth lens and the seventh lens on the optical axis satisfy 1.5 < T56/T67 < 3.2.
15. The imaging lens system according to claim 14, wherein a radius of curvature R1 of an object side surface of the first lens element and a radius of curvature R14 of an image side surface of the seventh lens element satisfy 1 < R1/R14 < 1.5.
16. The imaging lens system according to claim 15, wherein an object side surface of the first lens element is convex;
The total effective focal length f of the imaging lens and the curvature radius R1 of the object side surface of the first lens satisfy 2 < f/R1 < 2.6.
17. The imaging lens according to claim 14, wherein a radius of curvature R2 of an image side surface of the first lens and an effective focal length f1 of the first lens satisfy 1.3 < R2/f1 < 2.
18. The imaging lens according to any one of claims 14 to 17, wherein a total effective focal length f of the imaging lens and an entrance pupil diameter EPD of the imaging lens satisfy f/EPD < 2.0.
19. The imaging lens according to claim 18, wherein an effective focal length of the second lens and a total effective focal length f of the imaging lens satisfy-3.ltoreq.f2/f < -1.5.
20. The imaging lens according to claim 18, wherein an effective focal length f6 of the sixth lens and an optical total length TTL of the imaging lens satisfy 0.6 < f6/TTL < 1.3.
21. The imaging lens as claimed in claim 18, wherein an effective focal length f7 of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy-5 < f7/CT7 < -4.
22. The imaging lens system according to claim 18, wherein an effective half-diameter DT11 of an object side surface of the first lens element and an effective half-diameter DT51 of an object side surface of the fifth lens element satisfy 0.8 < DT11/DT51 < 1.2.
23. The imaging lens system according to claim 21, wherein a distance SAG71 between an intersection of the object side surface of the seventh lens element and the optical axis and an effective half-caliber vertex of the object side surface of the seventh lens element on the optical axis and a center thickness CT7 of the seventh lens element on the optical axis satisfy-0.5 < SAG71/CT7 < 0.
24. The imaging lens as claimed in claim 14, wherein a center thickness CT3 of the third lens element on the optical axis and a center thickness CT4 of the fourth lens element on the optical axis satisfy 1 < CT3/CT4 < 1.5.
25. The imaging lens as claimed in claim 14, wherein a center thickness CT4 of the fourth lens element on the optical axis and a center thickness CT5 of the fifth lens element on the optical axis satisfy CT4/CT5 being less than or equal to 1.
26. The imaging lens according to any one of claims 24 to 25, wherein a total optical length TTL of the imaging lens and a half of a diagonal length ImgH of an effective pixel area on an imaging surface of the imaging lens satisfy TTL/ImgH < 1.65.
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