CN108761730B - Image pickup lens - Google Patents

Image pickup lens Download PDF

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Publication number
CN108761730B
CN108761730B CN201810670789.XA CN201810670789A CN108761730B CN 108761730 B CN108761730 B CN 108761730B CN 201810670789 A CN201810670789 A CN 201810670789A CN 108761730 B CN108761730 B CN 108761730B
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China
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lens
imaging
image
imaging lens
convex
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CN108761730A (en
Inventor
高雪
李明
闻人建科
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201810670789.XA priority Critical patent/CN108761730B/en
Publication of CN108761730A publication Critical patent/CN108761730A/en
Priority to PCT/CN2019/081364 priority patent/WO2020001119A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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

Abstract

The application discloses camera lens, this camera lens includes in proper order along the optical axis from the thing side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens all have positive optical power or negative optical power; the second lens has positive optical power; the object side surface of the first lens is a concave surface, and the image side surface is a convex surface; and an air space is arranged between any two adjacent lenses of the first lens and the eighth lens. The total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens meet the requirement that f/EPD is less than or equal to 1.9.

Description

Image pickup lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an imaging lens including eight lenses.
Background
With the development of science and technology, portable electronic products are tending to be miniaturized, which also requires that the camera lens carried by them have a smaller overall length. Currently, the commonly used photosensitive elements of the imaging lens include a charge-coupled device (CCD) and a complementary metal oxide semiconductor (complementary metal-oxide semiconductor) image sensor, and the performance of the CMOS image sensor is continuously improved and the size of the CMOS image sensor is gradually reduced, so that the imaging lens corresponding to the CCD image sensor is required to further meet the requirements of high imaging quality and miniaturization.
In order to satisfy miniaturization, conventional lenses are generally configured to have F-numbers (F-numbers) of 2.0 or more to enable a reduction in size of the lens while having good optical performance. However, with the increasing strictness of market demands, users want the imaging lens to have a large aperture performance on the basis of ultra-thin and miniaturized imaging lens, so as to realize background blurring and still capture high-quality images especially under the conditions of insufficient light (such as overcast and rainy days, dusk, etc.), hand tremble, etc., and for this reason, the F number of 2.0 or more cannot meet the imaging requirements of higher orders.
Disclosure of Invention
The present application provides an imaging lens applicable to portable electronic products that can at least address or partially address at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an imaging lens sequentially including, 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, a seventh lens and an eighth lens. The first lens has positive focal power or negative focal power, the object side surface of the first lens can be a concave surface, and the image side surface of the first lens can be a convex surface; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens has positive optical power or negative optical power; and any two adjacent lenses from the first lens to the eighth lens can have an air space between them. The total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens can meet the requirement that f/EPD is less than or equal to 1.9.
In one embodiment, the second lens may have positive power, and the total effective focal length f of the imaging lens and the effective focal length f2 of the second lens may satisfy 0 < f2/f < 2.
In one embodiment, the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens may satisfy 1 < |f3/f| < 3.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy 0 < R2/R1 < 2.
In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy 1 < |R5/R6| < 3.
In one embodiment, the maximum effective radius DT21 of the object-side surface of the second lens and the maximum effective radius DT41 of the object-side surface of the fourth lens may satisfy 1 < DT21/DT41 < 1.5.
In one embodiment, the fourth lens may have positive power, and the total effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens may satisfy 0 < f/f4 < 0.5.
In one embodiment, the seventh lens may have positive optical power, and its image side may be convex.
In one embodiment, the eighth lens may have negative optical power, and its image-side surface may be concave.
In one embodiment, the central thickness CT1 of the first lens element, the central thickness CT2 of the second lens element and the central thickness CT3 of the third lens element satisfy 0 < (CT1+CT3)/CT 2 < 1.5.
In one embodiment, the sum of the air intervals Σat on the optical axis of any adjacent two lenses among the first to eighth lenses and the air interval T78 on the optical axis of the seventh and eighth lenses may satisfy 3.5 < Σat/T78 < 5.5.
In one embodiment, the air space T45 on the optical axis of the fourth lens and the fifth lens and the air space T56 on the optical axis of the fifth lens and the sixth lens may satisfy 1 < T45/T56 < 3.
In one embodiment, the total effective focal length f of the imaging lens, the maximum half field angle HFOV of the imaging lens, and the distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis may satisfy 0 < f×tan (HFOV)/TTL < 1.
In another aspect, the present application provides an imaging lens including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has positive focal power or negative focal power, the object side surface of the first lens can be a concave surface, and the image side surface of the first lens can be a convex surface; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens has positive optical power or negative optical power; and any two adjacent lenses from the first lens to the eighth lens can have an air space between them. The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis can satisfy 0 < (CT 1+ CT 3)/CT 2 < 1.5.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has positive focal power or negative focal power, the object side surface of the first lens can be a concave surface, and the image side surface of the first lens can be a convex surface; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens has positive optical power or negative optical power; and any two adjacent lenses from the first lens to the eighth lens can have an air space between them. Wherein the sum of the air intervals sigma AT of any two adjacent lenses with positive or negative optical power in the first lens to the eighth lens on the optical axis and the air interval T78 of the seventh lens and the eighth lens on the optical axis can meet 3.5 < sigmaAT/T78 < 5.5.
In still another aspect, the present application further provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has positive focal power or negative focal power, the object side surface of the first lens can be a concave surface, and the image side surface of the first lens can be a convex surface; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens has positive optical power or negative optical power; and any two adjacent lenses from the first lens to the eighth lens can have an air space between them. The air interval T45 of the fourth lens and the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis can satisfy 1 < T45/T56 < 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, a sixth lens, a seventh lens and an eighth lens. The first lens has positive focal power or negative focal power, the object side surface of the first lens can be a concave surface, and the image side surface of the first lens can be a convex surface; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens has positive optical power or negative optical power; and any two adjacent lenses from the first lens to the eighth lens can have an air space between them. The maximum effective radius DT21 of the object side of the second lens and the maximum effective radius DT41 of the object side of the fourth lens can satisfy 1 < DT21/DT41 < 1.5.
The eight 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 large aperture, ultra-thin, high resolution, good imaging quality, miniaturization 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 configuration diagram of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 2;
fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 3;
fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 4;
fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application;
Fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 5;
fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 6;
fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 7;
fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens of embodiment 8, respectively;
fig. 17 shows a schematic configuration 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, respectively, of the imaging lens of embodiment 9;
fig. 19 shows a schematic structural diagram 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, eight lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The eight 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 object-side surface of which may be concave, and the image-side surface of which may be convex; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens has positive optical power or negative optical power. The lens has the advantage of large aperture by reasonably controlling the surface shape and focal power of each lens.
In an exemplary embodiment, the object side surface of the second lens may be convex.
In an exemplary embodiment, the third lens may have negative optical power, and the object-side surface thereof may be convex and the image-side surface thereof may be concave.
In an exemplary embodiment, the fourth lens may have positive optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave.
In an exemplary embodiment, the object-side surface of the first lens may be concave, and the image-side surface may be convex; the seventh lens may have positive optical power, and an image side surface thereof may be convex; the eighth lens may have negative optical power, and an image-side surface thereof may be concave. The surface type and focal power of the first lens, the seventh lens and the eighth lens are further controlled, the image quality of each view field of the optical system can be effectively balanced, the sensitivity of the optical system is improved, the assembly stability of the system is guaranteed, and mass production is realized.
In an exemplary embodiment, the imaging lens can satisfy the condition that f/EPD is equal to or less than 1.9, wherein f is the total effective focal length of the imaging lens, and EPD is the entrance pupil diameter of the imaging lens. More specifically, f and EPD may further satisfy f/EPD.ltoreq.1.6, e.g., 1.41.ltoreq.f/EPD.ltoreq.1.49. The f/EPD is less than or equal to 1.9, so that the optical system has the advantage of a large aperture, and the imaging effect of the system in a weak light environment can be enhanced; meanwhile, the aberration of the edge view field can be reduced, and better optical Modulation Transfer Function (MTF) performance can be obtained, so that the overall imaging quality can be improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < f2/f < 2, where f is the total effective focal length of the imaging lens, and f2 is the effective focal length of the second lens. More specifically, f2 and f may further satisfy 0.5.ltoreq.f2/f.ltoreq.1.2, for example, 0.86.ltoreq.f2/f.ltoreq.1.01. The effective focal length of the second lens is reasonably set, so that the second lens meets positive focal power, the light position is adjusted, and meanwhile, the optical total length of the camera lens is shortened.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 1 < |f3/f| < 3, where f is the total effective focal length of the imaging lens and f3 is the effective focal length of the third lens. More specifically, f3 and f may further satisfy 1.5.ltoreq.f3/f.ltoreq.2.5, for example 1.85.ltoreq.f3/f.ltoreq.2.11. The effective focal length of the third lens is reasonably arranged so as to have larger positive focal power, so that the optical system has better field curvature balancing capability.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < R2/R1 < 2, where R1 is a radius of curvature of an object side surface of the first lens, and R2 is a radius of curvature of an image side surface of the first lens. More specifically, R2 and R1 may further satisfy 0.9.ltoreq.R2/R1.ltoreq.1.2, for example 1.02.ltoreq.R2/R1.ltoreq.1.06. The curvature radius of the object side surface and the image side surface of the first lens is reasonably set, so that the optical system can have a larger aperture, and the overall brightness of imaging can be improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1 < |r5/r6| < 3, where R5 is a radius of curvature of an object side surface of the third lens, and R6 is a radius of curvature of an image side surface of the third lens. More specifically, R5 and R6 may further satisfy 2.0.ltoreq.R5/R6.ltoreq.2.6, for example 2.02.ltoreq.R5/R6.ltoreq.2.53. The curvature radius of the object side surface and the curvature radius of the image side surface of the third lens are reasonably distributed, so that the light trend of the outer view field can be effectively controlled, and the optical system can be better matched with the chief ray angle of the chip.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 0 < (CT 1+ct 3)/CT 2 < 1.5, where CT1 is a central thickness of the first lens element on the optical axis, CT2 is a central thickness of the second lens element on the optical axis, and CT3 is a central thickness of the third lens element on the optical axis. More specifically, CT1, CT3 and CT2 may further satisfy 0.5.ltoreq.Ct1+Ct3)/CT 2.ltoreq.0.9, for example 0.69.ltoreq.Ct1+Ct3)/CT 2.ltoreq.0.74. The thicknesses of the centers of the first lens, the second lens and the third lens on the optical axis are reasonably distributed, so that the size of the optical system can be effectively reduced, and the volume of the photographing lens is prevented from being too large; meanwhile, the assembly difficulty of the lens can be reduced, and the higher space utilization rate can be realized.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 3.5 < Σat/T78 < 5.5, where Σat is the sum of the air intervals on the optical axis of any adjacent two lenses of the first lens to the eighth lens, and T78 is the air interval on the optical axis of the seventh lens and the eighth lens. More specifically, sigma AT and T78 further satisfy 4.06.ltoreq.Sigma AT/T78.ltoreq.5.21. Satisfies the condition that Sigma AT/T78 is less than 5.5, and can effectively ensure the miniaturization of the lens. By reasonably distributing the air thickness between adjacent lenses, the deflection of light rays tends to be relaxed, the sensitivity of the lens is reduced, and the astigmatism, distortion and chromatic aberration of the system can be reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1 < T45/T56 < 3, where T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens. More specifically, T45 and T56 may further satisfy 1.2.ltoreq.T45/T56.ltoreq.2.2, for example 1.46.ltoreq.T45/T56.ltoreq.2.06. The air intervals of the fourth lens, the fifth lens and the sixth lens on the optical axis are reasonably controlled, so that good processing gaps among optical elements can be ensured, and better light path deflection in the system can be ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of 0 < f×tan (HFOV)/TTL < 1, where f is the total effective focal length of the imaging lens, HFOV is the maximum half field angle of the imaging lens, and TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis. More specifically, f, HFOV and TTL may further satisfy 0.3.ltoreq.f×TAN (HFOV)/TTL.ltoreq.0.7, e.g., 0.49.ltoreq.f×TAN (HFOV)/TTL.ltoreq.0.50. The effective focal length, the maximum field angle and the total optical length of the optical system are reasonably distributed, and the size of the system can be effectively reduced so as to ensure that the lens has compact size characteristics.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1 < DT21/DT41 < 1.5, where DT21 is a maximum effective radius of an object side surface of the second lens, and DT41 is a maximum effective radius of an object side surface of the fourth lens. More specifically, DT21 and DT41 may further satisfy 1 < DT21/DT 41.ltoreq.1.3, e.g., 1.16.ltoreq.DT 21/DT 41.ltoreq.1.21. The ratio of the maximum effective radius of the object side surface of the second lens to the maximum effective radius of the object side surface of the fourth lens is reasonably controlled, so that the refractive power of light rays at the front end of the optical system can be effectively slowed down, the sensitivity of the optical system is reduced, and the dispersion of the optical system can be corrected.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < f/f4 < 0.5, where f is the total effective focal length of the imaging lens, and f4 is the effective focal length of the fourth lens. More specifically, f and f4 may further satisfy 0.09.ltoreq.f4.ltoreq.0.29. The ratio of the total effective focal length of the imaging lens to the effective focal length of the fourth lens is reasonably controlled, and the spherical aberration contribution of the fourth lens can be controlled within a reasonable level, so that the on-axis view field obtains good imaging quality.
In an exemplary embodiment, the image capturing lens may further include at least one diaphragm to improve the imaging quality of the lens. Alternatively, a diaphragm may be provided between the first lens and the second lens.
Optionally, the above-mentioned image pickup lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, eight lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the camera lens is more beneficial to production and processing and is applicable to portable electronic products. The imaging lens with the configuration can also have the beneficial effects of large aperture, ultra-thin, high resolution, good imaging quality, miniaturization and the like.
In the embodiments of the present application, aspherical mirror surfaces are often used for each lens. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. For example, although eight lenses are described as an example in the embodiment, the imaging lens is not limited to include eight lenses. The camera lens may also include other numbers of lenses, if desired.
Specific examples of the imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is 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 convex 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 convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S3-S16 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
S3 2.8157E-02 4.3407E-02 -1.2221E-01 2.0094E-01 -2.0115E-01 1.2326E-01 -4.4873E-02 8.7677E-03 -7.0185E-04
S4 -6.4100E-02 2.6169E-02 9.1851E-02 -2.1156E-01 2.2591E-01 -1.4247E-01 5.3459E-02 -1.0969E-02 9.4194E-04
S5 -5.7302E-02 -1.9149E-02 1.5167E-01 -1.9723E-01 1.2713E-01 -3.6325E-02 -3.2791E-03 5.0304E-03 -***4E-04
S6 6.6810E-02 -2.0696E-01 -6.7999E-02 9.6138E-01 -1.8261E+00 1.8355E+00 -1.0783E+00 3.5095E-01 -4.9203E-02
S7 2.1041E-01 -3.2687E-01 -1.6505E-01 1.3582E+00 -2.3614E+00 2.2672E+00 -1.2853E+00 4.0253E-01 -5.3549E-02
S8 4.4973E-02 -1.6260E-01 5.8532E-01 -1.7923E+00 3.4917E+00 -4.1497E+00 2.9687E+00 -1.1795E+00 2.0077E-01
S9 -6.2981E-02 1.5068E-02 -1.4213E-01 1.0004E-01 2.3116E-01 -6.0401E-01 6.1756E-01 -3.0864E-01 6.1457E-02
S10 -6.2880E-02 -1.1375E-02 9.1963E-02 -4.6724E-01 8.6904E-01 -8.8437E-01 5.3943E-01 -1.8643E-01 2.8100E-02
S11 -1.3019E-01 1.1406E-01 -9.7402E-02 -2.8068E-02 9.2869E-02 -7.0349E-02 3.8094E-02 -1.5359E-02 2.7730E-03
S12 -1.4293E-01 9.2089E-02 -1.9761E-02 -7.6529E-02 9.7847E-02 -5.5382E-02 1.7321E-02 -2.9285E-03 2.0892E-04
S13 -2.7776E-02 -4.5923E-02 5.7753E-02 -4.9425E-02 2.0635E-02 -3.9156E-03 1.4258E-04 6.3023E-05 -7.5239E-06
S14 5.2091E-02 -7.4359E-02 6.1313E-02 -3.4442E-02 1.0817E-02 -1.6269E-03 6.7076E-05 8.1155E-06 -6.7926E-07
S15 -3.0623E-01 2.1618E-01 -1.0753E-01 3.4496E-02 -6.2717E-03 5.4734E-04 -4.8105E-06 -2.5571E-06 1.2866E-07
S16 -1.4951E-01 1.1185E-01 -5.8274E-02 2.0640E-02 -4.9499E-03 7.8811E-04 -7.9816E-05 4.6599E-06 -1.1943E-07
TABLE 2
Table 3 shows half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 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 S19), the maximum half field angle HFOV, the f-number Fno, the total effective focal length f, and the effective focal lengths f1 to f8 of the respective lenses.
ImgH(mm) 3.00 f3(mm) -8.82
TTL(mm) 5.90 f4(mm) 17.32
HFOV(°) 34.8 f5(mm) 63.75
Fno 1.41 f6(mm) -23.76
f(mm) 4.18 f7(mm) 3.69
f1(mm) 594.23 f8(mm) -2.67
f2(mm) 4.21
TABLE 3 Table 3
The imaging lens in embodiment 1 satisfies:
f/epd=1.41, where f is the total effective focal length of the imaging lens, EPD is the entrance pupil diameter of the imaging lens;
f2/f=1.01, where f is the total effective focal length of the imaging lens, and f2 is the effective focal length of the second lens E2;
i f3/f i=2.11, where f is the total effective focal length of the imaging lens, and f3 is the effective focal length of the third lens E3;
r2/r1=1.03, wherein R1 is a radius of curvature of the object-side surface S1 of the first lens element E1, and R2 is a radius of curvature of the image-side surface S2 of the first lens element E1;
r5/r6|=2.13, where R5 is the radius of curvature of the object-side surface S5 of the third lens element E3, and R6 is the radius of curvature of the image-side surface S6 of the third lens element E3;
(CT 1+ CT 3)/CT 2 = 0.73, wherein CT1 is the center thickness of the first lens element E1 on the optical axis, CT2 is the center thickness of the second lens element E2 on the optical axis, and CT3 is the center thickness of the third lens element E3 on the optical axis;
Σat/t78=4.89, where Σat is the sum of the air intervals on the optical axis of any adjacent two lenses among the first lens E1 to eighth lens E8, and T78 is the air interval on the optical axis of the seventh lens E7 and eighth lens E8;
t45/t56=1.46, where T45 is an air space on the optical axis of the fourth lens E4 and the fifth lens E5, and T56 is an air space on the optical axis of the fifth lens E5 and the sixth lens E6;
F×tan (HFOV)/ttl=0.49, where f is the total effective focal length of the imaging lens, HFOV is the maximum half field angle of the imaging lens, and TTL is the distance between the object side surface S1 of the first lens E1 and the imaging surface on the optical axis;
DT21/DT41 = 1.18, wherein DT21 is the maximum effective radius of the object-side surface S3 of the second lens element E2, and DT41 is the maximum effective radius of the object-side surface S7 of the fourth lens element E4;
ff4=0.24, where f is the total effective focal length of the imaging lens, and f4 is the effective focal length of the fourth lens E4.
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve of the imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values 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 configuration diagram of an imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is 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 convex 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 convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 2, wherein the units of the radius of curvature and the thickness are millimeters (mm).
TABLE 4 Table 4
As can be seen from table 4, in embodiment 2, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 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
S3 3.1816E-02 2.1372E-02 -5.8601E-02 9.5193E-02 -9.4019E-02 5.6484E-02 -1.9996E-02 3.7223E-03 -2.7689E-04
S4 -6.7904E-02 3.5235E-02 7.8540E-02 -2.0124E-01 2.2510E-01 -1.4710E-01 5.7055E-02 -1.2132E-02 1.0858E-03
S5 -5.3025E-02 -4.2484E-02 2.4714E-01 -4.3381E-01 4.5889E-01 -3.0798E-01 1.2739E-01 -2.9383E-02 2.8735E-03
S6 4.4915E-02 -2.7649E-01 6.9076E-01 -1.2910E+00 1.7093E+00 -1.4664E+00 7.6412E-01 -2.1535E-01 2.4483E-02
S7 2.0504E-01 -4.8497E-01 9.3139E-01 -1.6109E+00 2.1149E+00 -1.8495E+00 1.0099E+00 -3.0897E-01 4.0387E-02
S8 4.8253E-02 -1.4998E-01 4.5943E-01 -1.2333E+00 2.1854E+00 -2.4333E+00 1.6699E+00 -6.4750E-01 1.0895E-01
S9 -7.0317E-02 2.9214E-02 -2.1708E-01 4.3474E-01 -5.4358E-01 4.2526E-01 -1.7827E-01 2.4884E-02 2.8483E-03
S10 -7.4461E-02 6.1226E-04 5.5997E-02 -3.6101E-01 6.8394E-01 -6.8867E-01 4.1525E-01 -1.4311E-01 2.1692E-02
S11 -1.3225E-01 1.0259E-01 -2.9927E-02 -1.7829E-01 2.6190E-01 -1.6725E-01 6.0295E-02 -1.3895E-02 1.7636E-03
S12 -1.5513E-01 1.0016E-01 6.0706E-03 -1.4568E-01 1.7779E-01 -1.0722E-01 3.6328E-02 -6.5768E-03 4.9286E-04
S13 -2.4668E-02 -6.5529E-02 1.0273E-01 -1.0780E-01 6.8354E-02 -2.8211E-02 7.3948E-03 -1.0847E-03 6.6498E-05
S14 7.0750E-02 -1.2945E-01 1.5007E-01 -1.2125E-01 6.4121E-02 -2.2327E-02 4.9661E-03 -6.3168E-04 3.4467E-05
S15 -3.2406E-01 2.2076E-01 -8.6698E-02 1.0481E-02 5.3254E-03 -2.4389E-03 4.2370E-04 -3.4931E-05 1.1337E-06
S16 -1.6877E-01 1.3210E-01 -7.0052E-02 2.5080E-02 -6.1012E-03 9.9533E-04 -1.0444E-04 6.3752E-06 -1.7179E-07
TABLE 5
Table 6 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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 2.
ImgH(mm) 3.00 f3(mm) -8.56
TTL(mm) 5.90 f4(mm) 16.12
HFOV(°) 34.6 f5(mm) 64.39
Fno 1.48 f6(mm) -21.06
f(mm) 4.22 f7(mm) 3.79
f1(mm) 624.63 f8(mm) -2.71
f2(mm) 4.17
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values 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 configuration diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is 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 convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 3, wherein the units of the radius of curvature and the thickness are millimeters (mm).
TABLE 7
As can be seen from table 7, in embodiment 3, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 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
S3 3.2240E-02 1.6805E-02 -4.6612E-02 7.8913E-02 -8.2109E-02 5.2769E-02 -2.0468E-02 4.3452E-03 -3.9247E-04
S4 -1.4008E-01 3.6765E-01 -6.6617E-01 7.9667E-01 -6.2552E-01 3.1891E-01 -1.0187E-01 1.8563E-02 -1.4796E-03
S5 -1.3536E-01 3.8146E-01 -7.6172E-01 9.9138E-01 -8.2768E-01 4.4329E-01 -1.4719E-01 2.7623E-02 -2.2482E-03
S6 -1.4088E-02 4.9508E-04 2.5476E-02 -2.9389E-01 7.4706E-01 -8.8295E-01 5.6106E-01 -1.8381E-01 2.4058E-02
S7 1.8572E-01 -4.0961E-01 7.4736E-01 -1.2549E+00 1.6237E+00 -1.3998E+00 7.5320E-01 -2.2697E-01 2.9207E-02
S8 5.2768E-02 -1.4914E-01 3.8266E-01 -9.4979E-01 1.6428E+00 -1.8155E+00 1.2484E+00 -4.8817E-01 8.3473E-02
S9 -6.8408E-02 1.2978E-02 -1.8775E-01 4.1276E-01 -5.7949E-01 5.4423E-01 -3.0858E-01 9.1001E-02 -1.0181E-02
S10 -7.4565E-02 3.9735E-03 -2.3294E-02 -1.0538E-01 2.3582E-01 -1.9069E-01 7.6245E-02 -1.6483E-02 1.8769E-03
S11 -1.3594E-01 1.2768E-01 -1.2750E-01 3.1937E-02 -4.9490E-02 1.6221E-01 -1.5931E-01 6.3947E-02 -9.2029E-03
S12 -1.6646E-01 1.1534E-01 1.4820E-02 -2.0963E-01 2.8083E-01 -1.8865E-01 7.0740E-02 -1.4231E-02 1.2374E-03
S13 -3.4067E-02 -6.0989E-02 1.0001E-01 -8.4999E-02 1.8441E-02 1.9616E-02 -1.6087E-02 4.5766E-03 -4.5456E-04
S14 7.6552E-02 -1.4853E-01 1.7838E-01 -1.3705E-01 6.1515E-02 -1.5440E-02 1.7902E-03 5.6734E-06 -1.4356E-05
S15 -3.0067E-01 1.5739E-01 3.7003E-02 -1.1517E-01 7.5674E-02 -2.5287E-02 4.7238E-03 -4.7036E-04 1.9478E-05
S16 -1.9889E-01 1.7363E-01 -9.8648E-02 3.6834E-02 -9.1824E-03 1.5175E-03 -1.5997E-04 9.7429E-06 -2.6059E-07
TABLE 8
Table 9 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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 3.
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values 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 configuration diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is 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 concave. 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 eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 4, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Table 10
As can be seen from table 10, in embodiment 4, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 are aspherical surfaces. Table 11 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 11
Table 12 shows 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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 4.
ImgH(mm) 3.00 f3(mm) -8.64
TTL(mm) 5.90 f4(mm) 15.11
HFOV(°) 34.6 f5(mm) 42.32
Fno 1.48 f6(mm) -16.57
f(mm) 4.20 f7(mm) 3.45
f1(mm) 495.69 f8(mm) -2.49
f2(mm) 4.19
Table 12
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 8B shows an astigmatism curve of the imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values 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 configuration diagram of an imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is 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 convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 5, wherein the units of the radius of curvature and the thickness are millimeters (mm).
TABLE 13
As can be seen from table 13, in example 5, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 are aspherical surfaces. Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 3.1598E-02 1.9561E-02 -5.7580E-02 1.0131E-01 -1.0898E-01 7.2747E-02 -2.9569E-02 6.6917E-03 -6.5577E-04
S4 -1.4993E-01 4.1457E-01 -7.6713E-01 9.3317E-01 -7.4479E-01 3.8606E-01 -1.2534E-01 2.3183E-02 -1.8710E-03
S5 -1.5964E-01 4.6524E-01 -9.0819E-01 1.1461E+00 -9.2160E-01 4.7001E-01 -1.4605E-01 2.4927E-02 -1.7559E-03
S6 -5.9373E-02 1.2352E-01 -1.6157E-01 -7.8984E-02 5.1780E-01 -6.4245E-01 3.7802E-01 -1.0683E-01 1.0885E-02
S7 1.7052E-01 -3.8935E-01 7.7235E-01 -1.3036E+00 1.5652E+00 -1.1761E+00 5.1280E-01 -1.1232E-01 8.2951E-03
S8 4.8437E-02 -1.2715E-01 2.6629E-01 -5.1110E-01 6.7401E-01 -5.4989E-01 2.7078E-01 -7.5991E-02 1.0133E-02
S9 -7.6453E-02 4.1777E-02 -3.0263E-01 7.9745E-01 -1.3317E+00 1.4287E+00 -9.3911E-01 3.4299E-01 -5.3568E-02
S10 -8.1968E-02 -7.0666E-03 6.7759E-03 -1.0414E-01 1.8523E-01 -1.2786E-01 3.2989E-02 1.5270E-03 -1.5694E-03
S11 -1.4209E-01 9.6900E-02 1.3509E-02 -2.9180E-01 4.3321E-01 -3.0398E-01 1.1739E-01 -2.7165E-02 3.4634E-03
S12 -1.7771E-01 1.0796E-01 1.0139E-01 -3.9498E-01 4.9491E-01 -3.4204E-01 1.3925E-01 -3.1905E-02 3.2603E-03
S13 -2.5673E-02 -1.1948E-01 2.5657E-01 -3.3924E-01 2.8822E-01 -1.6701E-01 6.4399E-02 -1.5005E-02 1.5869E-03
S14 8.6493E-02 -1.6625E-01 1.8704E-01 -1.3413E-01 5.6458E-02 -1.3313E-02 1.4356E-03 1.7946E-05 -1.2770E-05
S15 -2.8296E-01 9.6696E-02 1.1316E-01 -1.6823E-01 9.7228E-02 -3.0368E-02 5.3953E-03 -5.1528E-04 2.0612E-05
S16 -2.1648E-01 1.8795E-01 -1.0472E-01 3.8088E-02 -9.2069E-03 1.4733E-03 -1.5072E-04 8.9592E-06 -2.3568E-07
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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 5.
ImgH(mm) 3.00 f3(mm) -8.26
TTL(mm) 5.90 f4(mm) 15.20
HFOV(°) 34.9 f5(mm) 39.79
Fno 1.48 f6(mm) -16.97
f(mm) 4.16 f7(mm) 3.40
f1(mm) 483.01 f8(mm) -2.42
f2(mm) 4.12
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values 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 configuration diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 6, wherein the units of the radius of curvature and the thickness are millimeters (mm).
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Table 16
As can be seen from table 16, in example 6, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 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
S3 2.9588E-02 2.2650E-02 -6.6421E-02 1.1044E-01 -1.1433E-01 7.4084E-02 -2.9351E-02 6.4753E-03 -6.1269E-04
S4 -9.5273E-02 1.5852E-01 -1.6665E-01 1.1321E-01 -4.4315E-02 5.3156E-03 2.6436E-03 -1.0388E-03 9.9818E-05
S5 -7.7510E-02 8.3725E-02 -6.8287E-02 5.3315E-02 -2.7589E-02 4.8179E-03 2.7991E-03 -1.5722E-03 2.2174E-04
S6 2.3169E-02 -1.3380E-01 2.1888E-01 -3.3324E-01 4.8158E-01 -4.7647E-01 2.8531E-01 -9.2454E-02 1.2269E-02
S7 1.4236E-01 -2.5908E-01 3.6570E-01 -5.7412E-01 8.2412E-01 -7.9206E-01 4.6817E-01 -1.5378E-01 2.1531E-02
S8 4.9540E-02 -1.6374E-01 5.5936E-01 -1.5112E+00 2.5961E+00 -2.7574E+00 1.7784E+00 -6.4058E-01 9.9278E-02
S9 -6.7268E-02 -3.0003E-02 4.9577E-02 -2.0999E-01 4.4170E-01 -5.4538E-01 4.2121E-01 -1.8691E-01 3.5599E-02
S10 -6.9567E-02 -8.7507E-02 3.2622E-01 -8.3032E-01 1.1511E+00 -9.3679E-01 4.7020E-01 -1.4051E-01 1.9542E-02
S11 -1.3468E-01 6.7516E-02 3.3642E-02 -1.1475E-01 -1.2469E-01 4.0861E-01 -3.4836E-01 1.2769E-01 -1.7466E-02
S12 -1.6223E-01 7.2048E-02 1.2233E-01 -3.1436E-01 2.9468E-01 -1.3809E-01 3.0557E-02 -1.9423E-03 -1.3723E-04
S13 -1.9378E-02 -1.2858E-01 2.2351E-01 -2.4232E-01 1.6607E-01 -8.1419E-02 2.9667E-02 -7.3458E-03 8.8282E-04
S14 1.2698E-01 -2.3219E-01 2.5645E-01 -1.8266E-01 7.9920E-02 -2.1079E-02 3.0914E-03 -1.8309E-04 -2.3998E-06
S15 -2.8712E-01 9.3959E-02 1.1392E-01 -1.6271E-01 9.2651E-02 -2.8826E-02 5.1336E-03 -4.9332E-04 1.9903E-05
S16 -2.1326E-01 1.8678E-01 -1.0514E-01 3.8903E-02 -9.6120E-03 1.5728E-03 -1.6401E-04 9.8859E-06 -2.6210E-07
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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 6.
ImgH(mm) 3.00 f3(mm) -8.56
TTL(mm) 5.88 f4(mm) 45.54
HFOV(°) 35.0 f5(mm) 77.07
Fno 1.48 f6(mm) -17.88
f(mm) 4.15 f7(mm) 3.17
f1(mm) -274.94 f8(mm) -2.33
f2(mm) 3.55
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 configuration diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. 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 eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 7, wherein the units of the radius of curvature and the thickness are millimeters (mm).
TABLE 19
As can be seen from table 19, in example 7, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 20
Table 21 shows 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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 7.
ImgH(mm) 3.00 f3(mm) -7.95
TTL(mm) 5.87 f4(mm) 17.51
HFOV(°) 34.8 f5(mm) 152.12
Fno 1.48 f6(mm) 95.50
f(mm) 4.21 f7(mm) 4.67
f1(mm) 716.74 f8(mm) -2.85
f2(mm) 4.07
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 configuration diagram of an imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is 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 convex 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 convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 8, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Table 22
As can be seen from table 22, in example 8, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 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
S3 3.2806E-02 1.4556E-02 -3.9343E-02 6.4036E-02 -6.5196E-02 4.1228E-02 -1.5743E-02 3.2671E-03 -2.8414E-04
S4 -5.9373E-02 7.2414E-03 1.4037E-01 -3.0447E-01 3.4244E-01 -2.3264E-01 9.5069E-02 -2.1461E-02 2.0526E-03
S5 -5.4846E-02 -5.3947E-02 2.6867E-01 -4.2141E-01 4.0570E-01 -2.5924E-01 1.0692E-01 -2.5484E-02 2.6341E-03
S6 8.6088E-02 -4.6680E-01 1.2045E+00 -2.4610E+00 3.7718E+00 -3.8276E+00 2.3631E+00 -7.9520E-01 1.1102E-01
S7 2.4092E-01 -5.9951E-01 1.1279E+00 -2.0937E+00 3.2169E+00 -3.3032E+00 2.0533E+00 -6.9200E-01 9.6686E-02
S8 4.9428E-02 -1.7345E-01 6.2346E-01 -1.8545E+00 3.4925E+00 -4.0330E+00 2.8097E+00 -1.0885E+00 1.8129E-01
S9 -8.0315E-02 9.3268E-02 -4.8777E-01 1.1818E+00 -1.8512E+00 1.8736E+00 -1.1663E+00 4.0337E-01 -5.9384E-02
S10 -1.0025E-01 1.2812E-01 -3.8447E-01 6.5919E-01 -8.0374E-01 6.8395E-01 -3.6758E-01 1.0931E-01 -1.3556E-02
S11 -1.4032E-01 1.4316E-01 -2.0489E-01 2.2074E-01 -2.4881E-01 2.3360E-01 -1.3635E-01 4.2031E-02 -5.2533E-03
S12 -1.2861E-01 6.4831E-02 8.6740E-03 -9.8509E-02 1.1530E-01 -6.6841E-02 2.1145E-02 -3.3799E-03 2.1095E-04
S13 -2.4324E-02 -5.2467E-02 6.1223E-02 -4.8405E-02 1.2886E-02 7.5676E-03 -7.4294E-03 2.3224E-03 -2.5556E-04
S14 8.2499E-02 -1.2666E-01 1.3306E-01 -1.0402E-01 5.3952E-02 -1.8085E-02 3.7744E-03 -4.4164E-04 2.1872E-05
S15 -3.0477E-01 2.1340E-01 -1.0331E-01 3.0653E-02 -4.5401E-03 1.5142E-04 3.7882E-05 -3.8281E-06 6.1768E-08
S16 -1.6138E-01 1.2327E-01 -6.6868E-02 2.5015E-02 -6.4017E-03 1.0975E-03 -1.2039E-04 7.6277E-06 -2.1185E-07
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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 8.
Table 24
Fig. 16A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 8, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 16B shows an astigmatism curve of the imaging lens of embodiment 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the imaging lens of embodiment 8, which represents distortion magnitude values 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 configuration diagram of an imaging lens according to embodiment 9 of the present application.
As shown in fig. 17, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is 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 convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 25 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 9, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Table 25
As can be seen from table 25, in example 9, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 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.
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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 9.
ImgH(mm) 2.70 f3(mm) -8.09
TTL(mm) 5.87 f4(mm) 16.34
HFOV(°) 34.8 f5(mm) 26.41
Fno 1.47 f6(mm) -27.22
f(mm) 4.18 f7(mm) 4.25
f1(mm) 759.07 f8(mm) -2.71
f2(mm) 4.12
Table 27
Fig. 18A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 9, which indicates a convergent focus deviation after light rays of different wavelengths pass 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 configuration diagram of an imaging lens according to embodiment 10 of the present application.
As shown in fig. 19, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is 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 eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 28 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 10, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Table 28
As can be seen from table 28, in embodiment 10, the object side surface S1 and the image side surface S2 of the first lens element E1 are spherical surfaces, and the object side surface and the image side surface of any one of the second lens element E2 to the eighth lens element E8 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
S3 3.1893E-02 2.0398E-02 -6.1269E-02 1.0844E-01 -1.1755E-01 7.9291E-02 -3.2593E-02 7.4494E-03 -7.2972E-04
S4 -1.6466E-01 4.6376E-01 -8.7568E-01 1.0855E+00 -8.8363E-01 4.6781E-01 -1.5516E-01 2.9302E-02 -2.4099E-03
S5 -1.7923E-01 5.5705E-01 -1.1296E+00 1.4989E+00 -1.2978E+00 7.2967E-01 -2.5630E-01 5.0986E-02 -4.3836E-03
S6 -7.3511E-02 1.8838E-01 -2.9804E-01 1.0934E-01 4.0604E-01 -7.1806E-01 5.3420E-01 -1.9303E-01 2.7317E-02
S7 1.8892E-01 -4.5693E-01 9.4890E-01 -1.6575E+00 2.1243E+00 -1.8204E+00 9.8071E-01 -2.9691E-01 3.8359E-02
S8 6.5779E-02 -1.8280E-01 4.4897E-01 -1.0559E+00 1.7515E+00 -1.8851E+00 1.2652E+00 -4.8155E-01 8.0019E-02
S9 -6.5972E-02 -8.2737E-03 -1.2104E-01 3.7439E-01 -7.2830E-01 8.9557E-01 -6.5171E-01 2.5566E-01 -4.1916E-02
S10 -5.8159E-02 -1.0548E-01 2.6701E-01 -5.6371E-01 6.8354E-01 -4.3269E-01 1.2276E-01 -4.1790E-03 -3.2880E-03
S11 -9.5073E-02 -7.9131E-02 2.6030E-01 -3.4682E-01 1.1232E-02 4.9052E-01 -5.4600E-01 2.4265E-01 -3.9701E-02
S12 -1.0216E-01 -8.4889E-02 3.5043E-01 -6.0752E-01 5.9878E-01 -3.2909E-01 8.7119E-02 -5.3575E-03 -1.1199E-03
S13 -4.7037E-02 -4.7078E-02 1.5244E-02 9.5438E-02 -2.2678E-01 2.2879E-01 -1.2263E-01 3.3518E-02 -3.6238E-03
S14 6.2896E-02 -8.3645E-02 7.1717E-02 -3.8036E-02 2.0691E-03 9.3365E-03 -5.2292E-03 1.1946E-03 -1.0248E-04
S15 -2.6625E-01 1.7434E-01 -5.9902E-02 -1.0625E-02 2.0128E-02 -8.5561E-03 1.7896E-03 -1.8829E-04 7.8980E-06
S16 -1.5085E-01 1.1710E-01 -6.4518E-02 2.4126E-02 -6.1474E-03 1.0479E-03 -1.1421E-04 7.1770E-06 -1.9728E-07
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 f8 of the respective lenses on the imaging surface S19 of the imaging lens in embodiment 10.
ImgH(mm) 2.75 f3(mm) -7.91
TTL(mm) 5.90 f4(mm) 14.69
HFOV(°) 34.2 f5(mm) 56.04
Fno 1.49 f6(mm) -35.88
f(mm) 4.27 f7(mm) 3.90
f1(mm) 584.74 f8(mm) -2.63
f2(mm) 4.06
Table 30
Fig. 20A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 10, which indicates a 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.
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 above-described imaging lens.
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 (12)

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, a seventh lens and an eighth lens, characterized in that,
The first lens, the fifth lens and the sixth lens all have positive optical power or negative optical power;
the second lens, the fourth lens and the seventh lens all have positive optical power;
the third lens and the eighth lens each have negative optical power;
the object side surface of the first lens is a concave surface, and the image side surface is a convex surface;
the object side surface of the second lens is a convex surface;
the object side surface of the third lens is a convex surface, and the image side surface is a concave surface;
the object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface;
an air space is arranged between any two adjacent lenses from the first lens to the eighth lens;
the total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the requirement that f/EPD is not less than 1.41 and not more than 1.9;
the total effective focal length f of the camera lens and the effective focal length f2 of the second lens meet 0 < f2/f < 2; and
the number of lenses having optical power in the imaging lens is eight.
2. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens and an effective focal length f3 of the third lens satisfy 1 < |f3/f| < 3.
3. The imaging lens according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy 0 < R2/R1 < 2.
4. The imaging lens according to claim 2, wherein a radius of curvature R5 of an object side surface of the third lens and a radius of curvature R6 of an image side surface of the third lens satisfy 1 < |r5/r6| < 3.
5. The imaging lens according to claim 1, wherein a maximum effective radius DT21 of an object side surface of the second lens and a maximum effective radius DT41 of an object side surface of the fourth lens satisfy 1 < DT21/DT41 < 1.5.
6. The imaging lens according to claim 1, wherein the fourth lens has positive optical power, and a total effective focal length f of the imaging lens and an effective focal length f4 of the fourth lens satisfy 0 < f/f4 < 0.5.
7. The imaging lens according to any one of claims 1 to 6, wherein an image side surface of the seventh lens is convex.
8. The imaging lens according to claim 7, wherein an image side surface of the eighth lens element is concave.
9. The imaging lens according to any one of claims 1 to 6, wherein a sum Σat of air intervals on the optical axis of any adjacent two lenses of the first to eighth lenses and an air interval T78 on the optical axis of the seventh and eighth lenses satisfy 3.5 < Σat/T78 < 5.5.
10. The imaging lens as claimed in claim 9, wherein a center thickness CT1 of the first lens element on the optical axis, a center thickness CT2 of the second lens element on the optical axis, and a center thickness CT3 of the third lens element on the optical axis satisfy 0 < (CT 1+ct 3)/CT 2 < 1.5.
11. The imaging lens according to claim 9, wherein an air space T45 of the fourth lens and the fifth lens on the optical axis and an air space T56 of the fifth lens and the sixth lens on the optical axis satisfy 1 < T45/T56 < 3.
12. The imaging lens according to any one of claims 1 to 6, wherein a total effective focal length f of the imaging lens, a maximum half field angle HFOV of the imaging lens, and a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the imaging lens satisfy 0 < f×tan (HFOV)/TTL < 1.
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