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CN108490587B - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
CN108490587B
CN108490587B CN201810520948.8A CN201810520948A CN108490587B CN 108490587 B CN108490587 B CN 108490587B CN 201810520948 A CN201810520948 A CN 201810520948A CN 108490587 B CN108490587 B CN 108490587B
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lens
imaging
imaging lens
focal length
image
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CN108490587A (en
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徐标
张凯元
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 CN201810520948.8A priority Critical patent/CN108490587B/en
Publication of CN108490587A publication Critical patent/CN108490587A/en
Priority to PCT/CN2019/077468 priority patent/WO2019228017A1/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 imaging lens, this camera lens includes in proper order along the optical axis from the thing 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. Wherein the first lens has optical power; the second lens has optical power; the third lens has negative focal power; the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has optical power; the sixth lens has optical power; the seventh lens has positive focal power, and the image side surface of the seventh lens is a convex surface; and an air space is arranged between any two adjacent lenses.

Description

Imaging lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an imaging lens including seven lenses.
Background
With the high-speed updating of portable electronic products such as smart phones, portable computers and tablet devices, the performance requirements of imaging lenses matched with the portable electronic products in the market are higher and higher. In addition to the characteristics of high resolution, high relative brightness, etc., imaging lenses are required to have long focal length, etc. Through the collocation of long burnt camera lens and wide angle camera lens, so that imaging system has better imaging effect. Meanwhile, with the gradual thinning of high-end electronic products, the carried imaging lens has the characteristics of high imaging quality, long focal length and the like, and meanwhile, the ultrathin characteristic is also considered.
Disclosure of Invention
The present application provides an imaging lens applicable to portable electronic products that at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an imaging lens including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. Wherein, any two adjacent lenses can have an air space between them.
In one embodiment, the total effective focal length f of the imaging lens and the effective focal length f1 of the first lens may satisfy 1.5 < f/|f1| < 3.5.
In one embodiment, the maximum half field angle HFOV of the imaging lens may satisfy HFOV +.20°.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy 1 < (R7-R8)/(R7 + R8) < 3.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens may satisfy 1 < |f4/f1| < 2.
In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and the total effective focal length f of the imaging lens can satisfy TTL/f < 1.
In one embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R6 of the image side of the third lens may satisfy 2 < |r6|/|r1| < 3.
In one embodiment, the total effective focal length f of the imaging lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy 0 < |f/f2|+|f/f3| < 2.
In one embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens may satisfy-3 < f6/f7 < 0.
In one embodiment, the sum Σct of the total effective focal length f of the imaging lens and the center thicknesses of the first lens to the seventh lens on the optical axis may satisfy 1.5 < f/Σct < 3.
In one embodiment, the central thickness CT2 of the second lens element, the central thickness CT3 of the third lens element and the central thickness CT4 of the fourth lens element satisfy 1.5 < (CT2+CT4)/CT 3 < 3.
In one embodiment, the separation distance T45 of the fourth lens and the fifth lens on the optical axis and the separation distance T56 of the fifth lens and the sixth lens on the optical axis can satisfy 1.5 < T45/T56 < 4.
In 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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. Wherein, the maximum half field angle HFOV of the imaging lens can meet the HFOV of less than or equal to 20 degrees.
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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. Wherein, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens can satisfy 1 < (R7-R8)/(R7 + R8) < 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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. The effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens can meet 1 < |f4/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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. The distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and the total effective focal length f of the imaging lens can meet the condition that TTL/f is smaller than 1.
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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. The curvature radius R1 of the object side surface of the first lens and the curvature radius R6 of the image side surface of the third lens may satisfy 2 < |r6|/|r1| < 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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens can satisfy-3 < f6/f7 < 0.
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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. The sum Σct of the total effective focal length f of the imaging lens and the thicknesses of the centers of the first lens element and the seventh lens element on the optical axis can satisfy 1.5 < f/Σct < 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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Wherein the first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex. The distance T45 between the fourth lens and the fifth lens and the distance T56 between the fifth lens and the sixth lens on the optical axis can satisfy 1.5 < T45/T56 < 4.
Seven lenses are adopted, and the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens are reasonably distributed, so that the imaging lens has at least one beneficial effect of long focal length, ultra-thin, excellent imaging quality, low sensitivity and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an 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 structural view 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 structural view 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 structural 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 structural view 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 structural view 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 structural view 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 structural view 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;
Fig. 17 shows a schematic structural diagram of an imaging lens according to embodiment 9 of the present application;
fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens of embodiment 9, respectively;
fig. 19 shows a schematic structural view of an imaging lens according to embodiment 10 of the present application;
fig. 20A to 20D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 10.
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 near the object side is referred to as the object side of the lens, and the surface of each lens near the image side is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the 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 sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens has positive or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power, and an image side surface thereof may be convex.
The first lens has positive optical power or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power. By reasonably controlling the optical power of the first lens, the second lens and the third lens, the low-order aberration of the system can be effectively balanced, so that the system has good imaging quality. Further, the first lens may have positive optical power and the second lens may have negative optical power.
In an exemplary embodiment, the object side surface of the first lens may be convex.
In an exemplary embodiment, the image side surface of the third lens may be concave.
The object side surface and the image side surface of the fourth lens can be concave. The surface type is favorable for adjusting the angle of light entering and exiting the fourth lens, and can effectively reduce the sensitivity of the system, so that the system has good processing characteristics.
The fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens may have positive optical power. Through reasonable collocation of the fifth lens, the sixth lens and the seventh lens, higher-order aberration generated by the front group lens can be balanced, each view field of the system has smaller aberration, and matching of the principal ray and the image plane of the system can be facilitated. Further, the sixth lens may have negative optical power.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1.5 < f/|f1| < 3.5, where f is the total effective focal length of the imaging lens and f1 is the effective focal length of the first lens. More specifically, f and f1 may further satisfy 2.4.ltoreq.f/|f1|.ltoreq.2.8, for example, 2.49.ltoreq.f/|f1|.ltoreq.2.65. By reasonably controlling the effective focal length of the first lens, it can be made to produce negative spherical aberration to balance with positive spherical aberration produced by other lenses, thereby enabling the system to have good imaging quality on-axis.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression HFOV +.20, where HFOV is the maximum half field angle of the imaging lens. More specifically, HFOV's further may satisfy 18+.ltoreq.HFOV' s.ltoreq.19°, e.g., HFOV=18.1°. Under the condition of ensuring a certain image height, the system can have a larger focal length by controlling the field angle of the imaging lens within a range smaller than 40 degrees, so that the characteristic of long focus is realized.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of 1 < (R7-R8)/(r7+r8) < 3, where R7 is a radius of curvature of an object side surface of the fourth lens and R8 is a radius of curvature of an image side surface of the fourth lens. More specifically, R7 and R8 may further satisfy 1.5.ltoreq.R 7-R8)/(R7 +R8). Ltoreq.2.5, for example 1.90.ltoreq.R 7-R8)/(R7 +R8). Ltoreq.2.29. By reasonably controlling the curvature radius of the object side surface and the image side surface of the fourth lens, the astigmatic contribution of the object side surface and the image side surface of the fourth lens can be effectively controlled, and then the image quality of the intermediate view field and the aperture zone can be effectively and reasonably controlled.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of 1.5 < f/Σct < 3, where f is the total effective focal length of the imaging lens, Σct is the sum of the central thicknesses of the first lens to the seventh lens on the optical axis, respectively. More specifically, f and ΣCT may further satisfy 2.0.ltoreq.f/ΣCT.ltoreq.2.5, for example, 2.16.ltoreq.f/ΣCT.ltoreq.2.26. By controlling the sum of the thicknesses of the lenses in the imaging lens, the distortion range of the system can be reasonably controlled, so that the system has smaller distortion.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 1 < |f4/f1| < 2, where f1 is an effective focal length of the first lens and f4 is an effective focal length of the fourth lens. More specifically, f1 and f4 may further satisfy 1 < |f4/f1| < 1.5, for example 1.14.ltoreq.f4/f1|.ltoreq.1.40. By constraining the effective focal lengths of the first and fourth lenses, the spherical aberration contribution of the fourth lens can be controlled within a reasonable range so that good imaging quality is achieved for the on-axis field of view.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of 1.5 < (CT 2+ct 4)/CT 3 < 3, where CT2 is the center thickness of the second lens element on the optical axis, CT3 is the center thickness of the third lens element on the optical axis, and CT4 is the center thickness of the fourth lens element on the optical axis. More specifically, CT2, CT3 and CT4 may further satisfy 2.0.ltoreq.Ct2+Ct4)/CT 3.ltoreq.2.3, for example, 2.05.ltoreq.Ct2+Ct4)/CT 3.ltoreq.2.14. The central thickness of the second lens, the third lens and the fourth lens on the optical axis can be limited in a certain reasonable range when the condition 1.5 < (CT 2+CT4)/CT 3 < 3 is satisfied, so that the ultra-thin characteristic of the system is ensured while the processing performance is satisfied.
In an exemplary embodiment, the imaging lens of the present application may satisfy a condition of TTL/f < 1, where TTL is an on-axis distance from an object side surface of the first lens to an imaging surface of the imaging lens, and f is a total effective focal length of the imaging lens. More specifically, TTL and f may further satisfy 0.85+.ttl/f+.0.90, for example, TTL/f=0.88. The on-axis distance from the object side surface of the first lens to the imaging surface and the total effective focal length of the imaging lens can be constrained within a certain reasonable range when the condition TTL/f is smaller than 1, so that the excellent image quality of the optical system can be ensured, and the system can also have good processability.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 2 < |r6|/|r1| < 3, where R1 is a radius of curvature of the object side surface of the first lens and R6 is a radius of curvature of the image side surface of the third lens. More specifically, R1 and R6 may further satisfy 2.30.ltoreq.R6|/|R1| < 3, e.g., 2.42.ltoreq.R6|/|R1|.ltoreq.2.90. By restricting the range of the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the third lens, the coma contribution rate of the first lens and the third lens can be controlled within a reasonable range, and further, the coma generated by the front group lens can be well balanced, so that good imaging quality can be obtained.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1.5 < T45/T56 < 4, where T45 is a distance between the fourth lens and the fifth lens on the optical axis, and T56 is a distance between the fifth lens and the sixth lens on the optical axis. More specifically, T45 and T56 may further satisfy 2.0.ltoreq.T45/T56.ltoreq.3.7, e.g., 2.11.ltoreq.T45/T56.ltoreq.3.52. By restricting the air gap between the fourth lens and the sixth lens, the curvature of field generated by the front group lens and the curvature of field generated by the rear group lens of the imaging lens can be balanced, so that the system has reasonable curvature of field.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < |f/f2|+|f/f3| < 2, where f is the total effective focal length of the imaging lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. More specifically, f2 and f3 may further satisfy 0.5.ltoreq.f/f2.++ i f/f3.ltoreq.1.5, for example 0.88.ltoreq.f/f2.++ i f/f3.ltoreq.1.12. By constraining the effective focal lengths of the second lens and the third lens, the spherical aberration and the coma aberration of the second lens and the third lens can be reasonably constrained, so that the system has smaller aberration and good imaging quality.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that-3 < f6/f7 < 0, where f6 is an effective focal length of the sixth lens and f7 is an effective focal length of the seventh lens. More specifically, f6 and f7 may further satisfy-2.90.ltoreq.f6/f7.ltoreq.0.70, for example, -2.83.ltoreq.f6/f7.ltoreq.0.80. By restricting the focal power of the sixth lens and the focal power of the seventh lens within a reasonable range, the sixth lens and the seventh lens can have a reasonable three-order positive spherical aberration contribution and a five-order negative spherical aberration contribution, so that the residual spherical aberration generated by the front group lens can be balanced, and the image quality of the on-axis view field area of the imaging lens can reach a better level.
In an exemplary embodiment, the imaging lens may further include at least one diaphragm to improve the imaging quality of the lens. Alternatively, a diaphragm may be provided between the object side and the first lens.
Optionally, the imaging 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-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 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 imaging lens is more beneficial to production and processing and is applicable to portable electronic products. The imaging lens with the configuration can also have the beneficial effects of ultra-thin, long focal length, excellent imaging quality, low sensitivity and the like.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.
However, 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 this 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 imaging 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 accompanying 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: 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 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 convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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 imaging lens of embodiment 1, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Figure BDA0001674790830000121
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 BDA0001674790830000122
wherein x isWhen the height of the aspherical surface is h along the optical axis direction, the distance from the vertex of the aspherical surface is sagittal; 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 1.9600E-02 -3.5095E-02 2.3039E-01 -7.4523E-01 1.5248E+00 -1.9609E+00 1.5169E+00 -6.4437E-01 1.1332E-01
S2 -1.0499E-01 2.1871E-01 1.7789E-01 -1.7749E+00 3.6953E+00 -3.7045E+00 1.7567E+00 -2.2120E-01 -6.2422E-02
S3 -1.4055E-01 2.8531E-01 1.0093E+00 -6.4578E+00 1.4644E+01 -1.5769E+01 6.4763E+00 1.3604E+00 -1.3766E+00
S4 -9.8949E-03 1.1966E-02 3.0907E-01 2.4523E+00 -3.1293E+01 1.2071E+02 -2.1940E+02 1.9136E+02 -6.3590E+01
S5 4.4485E-02 -1.1898E-01 -1.1244E+00 1.7341E+01 -1.0319E+02 3.3273E+02 -5.9888E+02 5.5934E+02 -2.0874E+02
S6 -1.2494E-02 5.5449E-01 -4.9681E+00 3.9806E+01 -1.9429E+02 5.8306E+02 -1.0658E+03 1.0636E+03 -4.3323E+02
S7 -1.6101E-01 1.7170E-01 2.2845E+00 -2.1137E+01 8.6120E+01 -2.1633E+02 3.2441E+02 -2.8639E+02 1.3085E+02
S8 -3.9427E-02 3.8645E-01 -3.6825E-01 -3.5343E+00 1.9085E+01 -5.5148E+01 9.3145E+01 -8.2516E+01 2.9300E+01
S9 -1.0720E-01 4.4637E-02 6.1201E-02 -1.8811E-01 3.0263E-01 -2.6687E-01 1.2778E-01 -3.1250E-02 3.0512E-03
S10 -1.2878E-01 1.0474E-01 -4.7080E-02 -4.3211E-03 3.3837E-02 -2.3658E-02 7.2671E-03 -1.0641E-03 6.0728E-05
S11 -5.2930E-02 2.7411E-01 -5.2977E-01 6.2255E-01 -4.7441E-01 2.2448E-01 -6.2289E-02 9.2173E-03 -5.6015E-04
S12 3.6712E-02 1.7001E-01 -5.1771E-01 6.8643E-01 -5.4196E-01 2.6685E-01 -8.0172E-02 1.3368E-02 -9.4135E-04
S13 4.9217E-02 -2.0533E-02 -6.4715E-02 1.0060E-01 -7.2552E-02 3.1528E-02 -8.3864E-03 1.2510E-03 -7.9777E-05
S14 -1.9502E-02 -8.1754E-03 -8.7404E-03 1.5619E-02 -1.0669E-02 4.3238E-03 -1.0081E-03 1.2089E-04 -5.6401E-06
TABLE 2
Table 3 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the imaging lens in embodiment 1, the total optical length TTL (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17), the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses.
ImgH(mm) 1.98 f2(mm) -12.84
TTL(mm) 5.17 f3(mm) -10.65
HFOV(°) 18.1 f4(mm) -2.67
Fno 2.82 f5(mm) 12.28
f(mm) 5.90 f6(mm) -9.03
f1(mm) 2.29 f7(mm) 8.66
TABLE 3 Table 3
The imaging lens in embodiment 1 satisfies:
f/|f1|=2.57, wherein f is the total effective focal length of the imaging lens, and f1 is the effective focal length of the first lens E1;
HFOV = 18.1 °, wherein HFOV is the maximum half field angle of the imaging lens;
(R7-R8)/(r7+r8) =1.91, wherein R7 is the radius of curvature of the object-side surface S7 of the fourth lens element E4, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens element E4;
f/Σct=2.18, where f is the total effective focal length of the imaging lens, Σct is the sum of the center thicknesses of the first lens E1 to the seventh lens E7 on the optical axis;
i f4/f1 i=1.16, where f1 is the effective focal length of the first lens E1 and f4 is the effective focal length of the fourth lens E4;
(CT 2+ CT 4)/CT 3 = 2.05, wherein CT2 is the center thickness of the second lens element E2 on the optical axis, CT3 is the center thickness of the third lens element E3 on the optical axis, and CT4 is the center thickness of the fourth lens element E4 on the optical axis;
TTL/f=0.88, 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 f is the total effective focal length of the imaging lens;
R6/R1 = 2.62, wherein R1 is the radius of curvature of the object-side surface S1 of the first lens element E1, and R6 is the radius of curvature of the image-side surface S6 of the third lens element E3;
T45/t56=3.40, where T45 is the distance between the fourth lens E4 and the fifth lens E5 on the optical axis, and T56 is the distance between the fifth lens E5 and the sixth lens E6 on the optical axis;
f/f2+|f/f3|=1.01, where f is the total effective focal length of the imaging lens, f2 is the effective focal length of the second lens E2, and f3 is the effective focal length of the third lens E3;
f6/f7= -1.04, where f6 is the effective focal length of the sixth lens E6 and f7 is the effective focal length of the seventh lens E7.
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which indicates the 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 corresponding to different image heights. 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 structural 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: 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 concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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 imaging lens of example 2, wherein the units of the radii of curvature and thicknesses are millimeters (mm).
Figure BDA0001674790830000151
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 1.9860E-02 -3.6579E-02 2.3219E-01 -7.3231E-01 1.4598E+00 -1.8261E+00 1.3696E+00 -5.6047E-01 9.3578E-02
S2 -1.0130E-01 1.9627E-01 2.3277E-01 -1.8439E+00 3.7616E+00 -3.7944E+00 1.8677E+00 -2.9527E-01 -4.3301E-02
S3 -1.3578E-01 2.4643E-01 1.1311E+00 -6.6735E+00 1.4911E+01 -1.6026E+01 6.6393E+00 1.3121E+00 -1.3754E+00
S4 -8.5177E-03 1.1205E-02 1.9879E-01 3.5211E+00 -3.6350E+01 1.3436E+02 -2.4028E+02 2.0798E+02 -6.8864E+01
S5 3.7569E-02 -5.6879E-02 -1.5646E+00 2.0217E+01 -1.1686E+02 3.7314E+02 -6.6824E+02 6.2238E+02 -2.3211E+02
S6 -2.3670E-02 6.7768E-01 -6.1262E+00 4.8424E+01 -2.3694E+02 7.1542E+02 -1.3105E+03 1.3092E+03 -5.3596E+02
S7 -1.5703E-01 2.1531E-01 1.6104E+00 -1.5886E+01 6.0075E+01 -1.3466E+02 1.7090E+02 -1.2916E+02 6.3099E+01
S8 -2.9730E-02 3.6718E-01 -3.4136E-01 -3.8892E+00 2.1084E+01 -6.0566E+01 1.0117E+02 -8.8961E+01 3.1525E+01
S9 -1.0008E-01 5.9529E-02 8.8061E-03 -1.2677E-01 2.3497E-01 -1.9457E-01 7.8866E-02 -1.4106E-02 6.5594E-04
S10 -1.1695E-01 1.3650E-01 -1.5326E-01 1.0037E-01 -1.9013E-02 -8.1693E-03 4.5901E-03 -8.0991E-04 5.0484E-05
S11 -4.9057E-02 3.2762E-01 -7.3236E-01 8.7009E-01 -6.2073E-01 2.7039E-01 -6.9664E-02 9.6978E-03 -5.6064E-04
S12 2.5059E-02 2.2253E-01 -6.6049E-01 8.5230E-01 -6.4501E-01 3.0407E-01 -8.7966E-02 1.4234E-02 -9.7978E-04
S13 4.0566E-02 5.7924E-03 -9.9147E-02 1.2552E-01 -8.2062E-02 3.2972E-02 -8.2250E-03 1.1681E-03 -7.1933E-05
S14 -2.3755E-02 -3.5697E-03 -1.0966E-02 2.0261E-02 -1.6058E-02 7.5238E-03 -2.0584E-03 3.0280E-04 -1.8634E-05
TABLE 5
Table 6 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 2.
ImgH(mm) 1.98 f2(mm) -12.06
TTL(mm) 5.17 f3(mm) -10.65
HFOV(°) 18.1 f4(mm) -2.64
Fno 2.82 f5(mm) 11.39
f(mm) 5.91 f6(mm) -8.95
f1(mm) 2.28 f7(mm) 8.69
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which indicates the 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 corresponding to different image heights. 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 structural diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, 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: 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 negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens of example 3, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Figure BDA0001674790830000171
Figure BDA0001674790830000181
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 1.9884E-02 -3.2914E-02 2.2556E-01 -7.3972E-01 1.5457E+00 -2.0396E+00 1.6282E+00 -7.1857E-01 1.3255E-01
S2 -1.1165E-01 2.1822E-01 4.0725E-01 -2.9758E+00 6.7107E+00 -8.1151E+00 5.6155E+00 -2.1030E+00 3.3291E-01
S3 -1.4789E-01 2.8425E-01 1.3857E+00 -8.7858E+00 2.1788E+01 -2.8890E+01 2.1120E+01 -7.7710E+00 1.0593E+00
S4 -7.9306E-03 -7.8934E-03 8.3346E-01 -1.8154E+00 -1.2301E+01 7.0633E+01 -1.4214E+02 1.2734E+02 -4.1780E+01
S5 6.0281E-02 -2.6021E-01 8.0080E-02 8.0986E+00 -5.6496E+01 1.9141E+02 -3.5008E+02 3.2397E+02 -1.1639E+02
S6 1.3121E-03 3.4606E-01 -3.4152E+00 2.8047E+01 -1.3047E+02 3.6996E+02 -6.4595E+02 6.1568E+02 -2.3430E+02
S7 -1.7299E-01 7.7253E-02 3.2033E+00 -2.7306E+01 1.1787E+02 -3.2119E+02 5.3083E+02 -5.0443E+02 2.2523E+02
S8 -4.8886E-02 3.7576E-01 -2.5831E-01 -3.3445E+00 1.7105E+01 -4.9713E+01 8.5513E+01 -7.6903E+01 2.7560E+01
S9 -1.0711E-01 1.0470E-02 1.4393E-01 -2.7586E-01 3.7110E-01 -3.1859E-01 1.5826E-01 -4.1508E-02 4.4634E-03
S10 -1.3210E-01 5.0911E-02 7.6613E-02 -1.0991E-01 8.0698E-02 -3.5565E-02 9.0095E-03 -1.1998E-03 6.5023E-05
S11 -4.5614E-02 2.1585E-01 -4.0796E-01 5.2033E-01 -4.3145E-01 2.1541E-01 -6.1602E-02 9.2697E-03 -5.6870E-04
S12 5.6503E-02 1.3538E-01 -4.7260E-01 6.4604E-01 -5.1302E-01 2.5142E-01 -7.5026E-02 1.2448E-02 -8.7455E-04
S13 5.6658E-02 -3.4404E-02 -6.0587E-02 1.0087E-01 -7.1975E-02 3.0868E-02 -8.1922E-03 1.2318E-03 -7.9648E-05
S14 -1.5716E-02 -1.1258E-02 -1.3624E-02 2.1766E-02 -1.3259E-02 4.3918E-03 -6.9803E-04 2.3963E-05 3.6041E-06
TABLE 8
Table 9 shows half of the diagonal length of the effective pixel area ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 3.
Figure BDA0001674790830000182
Figure BDA0001674790830000191
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which indicates the 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 corresponding to different image heights. 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 structural diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, 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: 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 concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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 imaging lens of example 4, in which the units of the radii of curvature and thicknesses are millimeters (mm).
Figure BDA0001674790830000201
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 1.9950E-02 -3.5049E-02 2.3288E-01 -7.6597E-01 1.5954E+00 -2.0937E+00 1.6631E+00 -7.3285E-01 1.3582E-01
S2 -1.1698E-01 3.0068E-01 -1.2069E-01 -1.0905E+00 2.7291E+00 -2.9527E+00 1.5375E+00 -2.8789E-01 -1.7850E-02
S3 -1.5575E-01 3.9369E-01 6.3915E-01 -5.8574E+00 1.4938E+01 -1.8974E+01 1.2238E+01 -3.1881E+00 3.1227E-03
S4 -8.3328E-03 -9.3056E-03 7.6655E-01 -1.4183E+00 -1.3502E+01 7.3078E+01 -1.4570E+02 1.3056E+02 -4.3010E+01
S5 6.0238E-02 -2.7030E-01 4.1233E-02 1.0531E+01 -7.5595E+01 2.5977E+02 -4.8040E+02 4.5303E+02 -1.6884E+02
S6 -1.0447E-02 4.7294E-01 -4.4948E+00 3.7417E+01 -1.8400E+02 5.5072E+02 -9.9878E+02 9.8473E+02 -3.9450E+02
S7 -1.7217E-01 1.3677E-01 2.4435E+00 -1.9952E+01 7.3097E+01 -1.6187E+02 2.0607E+02 -1.5430E+02 7.1113E+01
S8 -4.5538E-02 3.3254E-01 2.3232E-01 -6.4716E+00 2.8202E+01 -7.2882E+01 1.1357E+02 -9.4929E+01 3.2268E+01
S9 -1.1240E-01 5.6211E-03 1.8521E-01 -3.6786E-01 5.0395E-01 -4.4186E-01 2.2681E-01 -6.2183E-02 7.0637E-03
S10 -1.3677E-01 6.0347E-02 6.6597E-02 -9.5844E-02 6.8491E-02 -2.9940E-02 7.6006E-03 -1.0168E-03 5.5318E-05
S11 -3.8716E-02 1.9947E-01 -3.5786E-01 4.5055E-01 -3.8367E-01 1.9701E-01 -5.7462E-02 8.7547E-03 -5.4113E-04
S12 6.1856E-02 8.5363E-02 -3.5622E-01 5.1472E-01 -4.2887E-01 2.1918E-01 -6.7695E-02 1.1534E-02 -8.2639E-04
S13 5.9273E-02 -5.9306E-02 -1.6391E-02 6.2223E-02 -5.1903E-02 2.4280E-02 -6.8259E-03 1.0658E-03 -7.0568E-05
S14 -1.2121E-02 -1.6372E-02 -7.1642E-03 1.3286E-02 -6.3512E-03 1.0001E-03 2.8277E-04 -1.2945E-04 1.3609E-05
TABLE 11
Table 12 shows half of the diagonal length of the effective pixel area ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 4.
ImgH(mm) 1.98 f2(mm) -10.27
TTL(mm) 5.17 f3(mm) -10.73
HFOV(°) 18.1 f4(mm) -2.70
Fno 2.82 f5(mm) 11.89
f(mm) 5.89 f6(mm) -8.46
f1(mm) 2.23 f7(mm) 8.92
Table 12
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the 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 corresponding to different image heights. 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 structural diagram of an imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, 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: 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 concave and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens of example 5, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Figure BDA0001674790830000221
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 BDA0001674790830000222
Figure BDA0001674790830000231
TABLE 14
Table 15 shows half of the diagonal length of the effective pixel region ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 5.
ImgH(mm) 1.98 f2(mm) -19.41
TTL(mm) 5.17 f3(mm) -7.66
HFOV(°) 18.1 f4(mm) -2.80
Fno 2.82 f5(mm) 13.27
f(mm) 5.90 f6(mm) -10.27
f1(mm) 2.24 f7(mm) 12.91
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which indicates the convergent focus deviation of light rays of different wavelengths after passing 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 corresponding to different image heights. 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 structural diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, 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: 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 concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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 imaging lens of example 6, in which the units of the radii of curvature and thicknesses are millimeters (mm).
Figure BDA0001674790830000241
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 1.8529E-02 -2.1747E-02 1.8477E-01 -6.8673E-01 1.5752E+00 -2.2403E+00 1.9096E+00 -8.9932E-01 1.7819E-01
S2 -1.5479E-01 5.2508E-01 -8.0483E-01 6.2712E-01 -8.8336E-01 2.4284E+00 -3.4710E+00 2.2963E+00 -5.8019E-01
S3 -2.0975E-01 7.8713E-01 -9.4088E-01 -6.9279E-01 2.3652E+00 9.8041E-01 -6.9208E+00 6.8954E+00 -2.2315E+00
S4 -1.1445E-02 4.9646E-03 1.0366E+00 -4.7898E+00 4.7745E+00 1.8595E+01 -5.6711E+01 5.7838E+01 -2.0517E+01
S5 1.2709E-01 -7.7152E-01 3.0514E+00 -7.4859E+00 2.0265E+00 4.8739E+01 -1.3663E+02 1.5080E+02 -6.0148E+01
S6 7.1214E-02 -2.7977E-01 2.1635E-01 7.4593E+00 -5.4190E+01 1.9304E+02 -3.9415E+02 4.2269E+02 -1.7980E+02
S7 -1.3984E-01 -1.0620E-01 4.8367E+00 -4.4674E+01 2.1378E+02 -6.3732E+02 1.1574E+03 -1.1878E+03 5.4032E+02
S8 6.8262E-03 2.4300E-01 1.1318E+00 -1.3081E+01 5.3348E+01 -1.2989E+02 1.9216E+02 -1.5561E+02 5.2228E+01
S9 -3.4096E-01 2.5269E-01 6.2131E-01 -1.6464E+00 2.1021E+00 -1.7084E+00 8.6215E-01 -2.4077E-01 2.7573E-02
S10 -5.2731E-01 6.0993E-01 -2.1053E-01 4.7658E-02 -8.4688E-02 7.1946E-02 -2.6489E-02 4.5805E-03 -3.0729E-04
S11 -1.4749E-01 8.4715E-02 1.3739E-01 -1.3279E-01 7.1343E-03 3.0695E-02 -1.3731E-02 2.3800E-03 -1.5109E-04
S12 2.9753E-01 -3.3312E-01 -1.3616E-02 3.6577E-01 -3.8381E-01 2.0246E-01 -6.1449E-02 1.0221E-02 -7.1887E-04
S13 2.3801E-01 -3.9248E-01 4.3048E-01 -3.9560E-01 2.3729E-01 -8.0476E-02 1.3471E-02 -6.5694E-04 -4.6697E-05
S14 4.1619E-02 -1.3298E-01 1.7167E-01 -1.7851E-01 1.2028E-01 -5.0998E-02 1.3327E-02 -1.9579E-03 1.2336E-04
TABLE 17
Table 18 shows half of the diagonal length of the effective pixel region ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 6.
ImgH(mm) 1.98 f2(mm) -15.34
TTL(mm) 5.17 f3(mm) -8.38
HFOV(°) 18.1 f4(mm) -2.97
Fno 2.82 f5(mm) -261.66
f(mm) 5.89 f6(mm) -40.00
f1(mm) 2.23 f7(mm) 14.15
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 corresponding to different image heights. 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 structural diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, 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: 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 concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. 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, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens of example 7, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Figure BDA0001674790830000261
Figure BDA0001674790830000271
TABLE 19
As is clear from table 19, in example 7, the object side surface and the image side surface of any one of the first lens element E1 to the seventh lens element E7 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.1441E-02 -4.5164E-02 3.3850E-01 -1.1976E+00 2.5898E+00 -3.5174E+00 2.9157E+00 -1.3555E+00 2.6859E-01
S2 -2.3614E-01 1.4618E+00 -5.1358E+00 1.1632E+01 -1.7545E+01 1.7610E+01 -1.1395E+01 4.3301E+00 -7.3573E-01
S3 -3.0798E-01 2.1174E+00 -8.1973E+00 2.0476E+01 -3.3510E+01 3.6349E+01 -2.5498E+01 1.0597E+01 -1.9930E+00
S4 -7.2516E-02 1.3228E+00 -9.0968E+00 3.3345E+01 -7.4765E+01 1.0997E+02 -1.0513E+02 5.9325E+01 -1.4758E+01
S5 1.2478E-01 5.7028E-02 -4.8201E+00 2.2472E+01 -5.1663E+01 7.2057E+01 -6.2764E+01 3.1453E+01 -6.0859E+00
S6 1.4278E-01 -4.2923E-01 -4.8817E-01 5.6626E+00 -1.8316E+01 2.7486E+01 -4.7411E+00 -3.8415E+01 3.6016E+01
S7 -1.0233E-01 -8.5582E-02 1.7629E+00 -2.4487E+01 1.2575E+02 -3.8163E+02 7.1495E+02 -7.6471E+02 3.5915E+02
S8 2.6979E-02 5.3344E-01 -3.7341E+00 1.7652E+01 -6.9462E+01 1.9319E+02 -3.3092E+02 3.1035E+02 -1.2197E+02
S9 -4.8066E-01 7.5775E-01 2.6228E-01 -3.1178E+00 6.1788E+00 -6.4619E+00 3.8956E+00 -1.2875E+00 1.8161E-01
S10 -7.3249E-01 1.3162E+00 -1.2177E+00 1.1167E+00 -2.0406E+00 3.2390E+00 -2.7962E+00 1.1975E+00 -2.0228E-01
S11 -1.7122E-01 -1.6373E-01 1.7586E+00 -3.8666E+00 4.5545E+00 -3.2328E+00 1.3905E+00 -3.3630E-01 3.5228E-02
S12 4.2485E-01 -8.2889E-01 1.0074E+00 -8.7947E-01 5.5368E-01 -2.3573E-01 6.1928E-02 -8.7624E-03 4.7665E-04
S13 3.0171E-01 -5.0356E-01 4.8311E-01 -3.2495E-01 1.1890E-01 -4.5132E-03 -1.2277E-02 3.9113E-03 -3.8202E-04
S14 3.7432E-02 -9.2832E-02 8.1613E-02 -9.8194E-02 8.6634E-02 -4.8921E-02 1.7274E-02 -3.4426E-03 2.9264E-04
Table 20
Table 21 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 7.
Figure BDA0001674790830000272
Figure BDA0001674790830000281
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 corresponding to different image heights. 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 structural diagram of an imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, 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: 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 concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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 imaging lens of example 8, in which the units of the radii of curvature and thicknesses are millimeters (mm).
Figure BDA0001674790830000291
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 1.8914E-02 -2.3045E-02 2.1720E-01 -8.0559E-01 1.7958E+00 -2.4965E+00 2.1068E+00 -9.9574E-01 1.9993E-01
S2 -2.4217E-01 1.5476E+00 -5.6932E+00 1.3617E+01 -2.1701E+01 2.2847E+01 -1.5279E+01 5.8787E+00 -9.8905E-01
S3 -3.1211E-01 2.2259E+00 -9.0116E+00 2.3540E+01 -4.0097E+01 4.4621E+01 -3.1281E+01 1.2527E+01 -2.1762E+00
S4 -6.7304E-02 1.2526E+00 -8.5436E+00 2.9773E+01 -5.9468E+01 7.0374E+01 -4.5633E+01 1.1642E+01 9.8094E-01
S5 1.2684E-01 1.5107E-02 -4.5521E+00 2.0816E+01 -4.2448E+01 4.0975E+01 -5.2805E+00 -2.2819E+01 1.4423E+01
S6 1.5018E-01 -4.8664E-01 -7.7181E-02 2.6643E+00 -2.9969E+00 -2.0275E+01 7.9926E+01 -1.1534E+02 6.3206E+01
S7 -9.6881E-02 -4.6449E-02 3.9317E-02 -8.4119E+00 4.5661E+01 -1.3361E+02 2.3728E+02 -2.3849E+02 1.0495E+02
S8 2.8285E-02 4.7908E-01 -3.7428E+00 1.8691E+01 -6.9933E+01 1.8123E+02 -2.9335E+02 2.6435E+02 -1.0147E+02
S9 -4.9827E-01 1.1024E+00 -2.0398E+00 4.1833E+00 -6.9833E+00 7.9139E+00 -5.5587E+00 2.1624E+00 -3.5488E-01
S10 -7.6559E-01 1.7621E+00 -3.4070E+00 6.6510E+00 -1.0038E+01 1.0134E+01 -6.3124E+00 2.1744E+00 -3.1551E-01
S11 -1.7991E-01 3.2766E-02 8.8261E-01 -1.9157E+00 2.0274E+00 -1.2345E+00 4.3268E-01 -7.9405E-02 5.6176E-03
S12 4.2443E-01 -9.4490E-01 1.3645E+00 -1.3996E+00 9.8040E-01 -4.4494E-01 1.2299E-01 -1.8586E-02 1.1519E-03
S13 3.0429E-01 -5.0987E-01 4.5256E-01 -1.9074E-01 -6.2773E-02 1.1439E-01 -5.2968E-02 1.0811E-02 -8.2785E-04
S14 4.1955E-02 -3.3316E-02 -1.9987E-01 4.0606E-01 -3.8893E-01 2.1158E-01 -6.6426E-02 1.1220E-02 -7.8873E-04
Table 23
Table 24 shows half of the diagonal length of the effective pixel area ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 8.
ImgH(mm) 1.98 f2(mm) -15.53
TTL(mm) 5.17 f3(mm) -8.35
HFOV(°) 18.1 f4(mm) -3.08
Fno 2.82 f5(mm) -183.47
f(mm) 5.89 f6(mm) -42.40
f1(mm) 2.24 f7(mm) 21.38
Table 24
Fig. 16A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 8, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve of the 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 corresponding to different image heights. 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.
Example 9
An imaging lens according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic structural diagram of an imaging lens according to embodiment 9 of the present application.
As shown in fig. 17, 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: 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 concave and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 25 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens of example 9, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Figure BDA0001674790830000311
Table 25
As is clear from table 25, in example 9, the object side surface and the image side surface of any one of the first lens element E1 to the seventh lens element E7 are aspherical surfaces. Table 26 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 9, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Figure BDA0001674790830000312
Figure BDA0001674790830000321
Table 26
Table 27 shows half of the diagonal length of the effective pixel region ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 9.
ImgH(mm) 1.98 f2(mm) -20.06
TTL(mm) 5.17 f3(mm) -7.52
HFOV(°) 18.1 f4(mm) -3.12
Fno 2.82 f5(mm) -162.90
f(mm) 5.89 f6(mm) -46.53
f1(mm) 2.23 f7(mm) 23.27
Table 27
Fig. 18A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 9, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve of the imaging lens of embodiment 9, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 18C shows a distortion curve of the imaging lens of embodiment 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18D shows a magnification chromatic aberration curve of the imaging lens of embodiment 9, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 18A to 18D, the imaging lens provided in embodiment 9 can achieve good imaging quality.
Example 10
An imaging lens according to embodiment 10 of the present application is described below with reference to fig. 19 to 20D. Fig. 19 shows a schematic structural diagram of an imaging lens according to embodiment 10 of the present application.
As shown in fig. 19, 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: 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 concave and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave, 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 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 negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is convex. 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 28 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the imaging lens of embodiment 10, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Figure BDA0001674790830000331
Figure BDA0001674790830000341
Table 28
As can be seen from table 28, in embodiment 10, the object side surface and the image side surface of any one of the first lens element E1 to the seventh lens element E7 are aspherical surfaces. Table 29 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 10, where each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.9407E-02 -1.5298E-02 1.6638E-01 -6.2879E-01 1.4413E+00 -2.0766E+00 1.8225E+00 -8.9835E-01 1.8799E-01
S2 -2.5480E-01 1.6817E+00 -6.3101E+00 1.5154E+01 -2.4044E+01 2.5137E+01 -1.6727E+01 6.4421E+00 -1.0944E+00
S3 -3.2010E-01 2.2852E+00 -9.3084E+00 2.4500E+01 -4.2230E+01 4.7939E+01 -3.4707E+01 1.4592E+01 -2.7167E+00
S4 -6.8887E-02 1.3984E+00 -1.0209E+01 3.9613E+01 -9.2882E+01 1.3877E+02 -1.2967E+02 6.8995E+01 -1.5768E+01
S5 1.1537E-01 3.3916E-01 -7.7846E+00 3.8939E+01 -1.0358E+02 1.6874E+02 -1.6811E+02 9.3631E+01 -2.1564E+01
S6 1.5947E-01 -6.4398E-01 8.6499E-01 -2.6345E+00 1.9483E+01 -8.3321E+01 1.9018E+02 -2.2434E+02 1.0960E+02
S7 -9.5716E-02 -9.7736E-02 1.2121E+00 -1.8042E+01 9.1603E+01 -2.7067E+02 4.8992E+02 -5.0376E+02 2.2738E+02
S8 3.2096E-02 4.0919E-01 -2.4872E+00 9.8912E+00 -3.4756E+01 9.2658E+01 -1.5606E+02 1.4477E+02 -5.6417E+01
S9 -4.9446E-01 9.4585E-01 -1.0083E+00 9.3704E-01 -1.0815E+00 1.3532E+00 -1.1619E+00 5.3087E-01 -9.7387E-02
S10 -7.3019E-01 1.4371E+00 -2.0128E+00 3.1984E+00 -4.8409E+00 5.3127E+00 -3.6192E+00 1.3447E+00 -2.0743E-01
S11 -1.4507E-01 -2.6455E-01 1.8909E+00 -3.8284E+00 4.2269E+00 -2.8023E+00 1.1137E+00 -2.4549E-01 2.3128E-02
S12 4.2627E-01 -8.7774E-01 1.1735E+00 -1.0946E+00 6.6933E-01 -2.3935E-01 3.8866E-02 6.0685E-04 -7.1030E-04
S13 3.0782E-01 -4.9030E-01 3.9263E-01 -1.5673E-01 -4.2807E-02 8.4227E-02 -3.9891E-02 8.3760E-03 -6.6660E-04
S14 4.2980E-02 -6.5545E-02 -6.1713E-02 1.5002E-01 -1.3691E-01 6.9000E-02 -1.9642E-02 2.9195E-03 -1.7219E-04
Table 29
Table 30 shows half of the diagonal length of the effective pixel region ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 of the respective lenses on the imaging surface S17 of the imaging lens in embodiment 10.
ImgH(mm) 1.98 f2(mm) -148.13
TTL(mm) 5.17 f3(mm) -5.84
HFOV(°) 18.1 f4(mm) -3.06
Fno 2.82 f5(mm) -92.01
f(mm) 5.90 f6(mm) -56.54
f1(mm) 2.23 f7(mm) 23.54
Table 30
Fig. 20A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 10, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 20B shows an astigmatism curve of the imaging lens of embodiment 10, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 20C shows a distortion curve of the imaging lens of embodiment 10, which represents distortion magnitude values corresponding to different image heights. Fig. 20D shows a magnification chromatic aberration curve of the imaging lens of embodiment 10, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 20A to 20D, the imaging lens provided in embodiment 10 can achieve good imaging quality.
In summary, examples 1 to 10 satisfy the relationships shown in table 31, respectively.
Figure BDA0001674790830000351
Table 31
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 imaging 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 (21)

1. The imaging lens sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, characterized in that,
The first lens has positive optical power;
the second lens has negative optical power;
the third lens has negative focal power;
the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface;
the fifth lens has optical power;
the sixth lens has negative focal power; and
the seventh lens has positive focal power, and the image side surface of the seventh lens is a convex surface; and
an air space is arranged between any two adjacent lenses;
the number of lenses having optical power in the imaging lens is seven;
the effective focal length f4 of the fourth lens and the effective focal length f1 of the first lens satisfy 1 < |f4/f1| < 2.
2. The imaging lens of claim 1, wherein a total effective focal length f of the imaging lens and an effective focal length f1 of the first lens satisfy 1.5 < f/|f1| < 3.5.
3. The imaging lens of claim 1 wherein a maximum half field angle HFOV of the imaging lens satisfies HFOV +.20 °.
4. The imaging lens as claimed in claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy 1 < (R7-R8)/(r7+r8) < 3.
5. The imaging lens as claimed in claim 1, wherein a distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens on the optical axis and a total effective focal length f of the imaging lens satisfy TTL/f < 1.
6. The imaging lens as claimed in claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R6 of an image side surface of the third lens satisfy 2 < |r6|/|r1| < 3.
7. The imaging lens as claimed in claim 6, wherein a total effective focal length f of the imaging lens, an effective focal length f2 of the second lens, and an effective focal length f3 of the third lens satisfy 0 < |f/f2|+|f/f3| < 2.
8. The imaging lens as claimed in claim 1, wherein an effective focal length f6 of the sixth lens and an effective focal length f7 of the seventh lens satisfy-3 < f6/f7 < 0.
9. The imaging lens according to any one of claims 1 to 8, wherein a sum Σct of a total effective focal length f of the imaging lens and center thicknesses of the first lens to the seventh lens on the optical axis, respectively, satisfies 1.5 < f/Σct < 3.
10. The imaging lens as claimed in any one of claims 1 to 8, wherein a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy 1.5 < (CT 2+ct 4)/CT 3 < 3.
11. The imaging lens according to any one of claims 1 to 8, wherein a separation distance T45 of the fourth lens and the fifth lens on the optical axis and a separation distance T56 of the fifth lens and the sixth lens on the optical axis satisfy 1.5 < T45/T56 < 4.
12. The imaging lens sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, characterized in that,
the first lens has positive optical power;
the second lens has negative optical power;
the third lens has negative focal power;
the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface;
the fifth lens has optical power;
the sixth lens has negative focal power; and
the seventh lens has positive focal power, and the image side surface of the seventh lens is a convex surface;
the number of lenses having optical power in the imaging lens is seven;
the maximum half field angle HFOV of the imaging lens meets the HFOV of less than or equal to 20 degrees;
the effective focal length f4 of the fourth lens and the effective focal length f1 of the first lens satisfy 1 < |f4/f1| < 2.
13. The imaging lens as claimed in claim 12, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy 1 < (R7-R8)/(r7+r8) < 3.
14. The imaging lens as claimed in claim 12, wherein a distance TTL from the first lens object side surface to an imaging surface of the imaging lens on the optical axis and a total effective focal length f of the imaging lens satisfy TTL/f < 1.
15. The imaging lens as claimed in claim 12, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R6 of an image side surface of the third lens satisfy 2 < |r6|/|r1| < 3.
16. The imaging lens of claim 15, wherein a total effective focal length f of the imaging lens and an effective focal length f1 of the first lens satisfy 1.5 < f/|f1| < 3.5.
17. The imaging lens of claim 15, wherein the total effective focal length f of the imaging lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy 0 < |f/f2|+|f/f3| < 2.
18. The imaging lens of claim 12, wherein an effective focal length f6 of the sixth lens and an effective focal length f7 of the seventh lens satisfy-3 < f6/f7 < 0.
19. The imaging lens of any of claims 12 to 18, wherein a sum Σct of a total effective focal length f of the imaging lens and a center thickness of the first lens to the seventh lens on the optical axis satisfies 1.5 < f/Σct < 3.
20. The imaging lens of any one of claims 12 to 18, wherein a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy 1.5 < (CT 2+ct 4)/CT 3 < 3.
21. The imaging lens according to any one of claims 12 to 18, wherein a separation distance T45 of the fourth lens and the fifth lens on the optical axis and a separation distance T56 of the fifth lens and the sixth lens on the optical axis satisfy 1.5 < T45/T56 < 4.
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