CN114326046B - Image pickup lens - Google Patents

Image pickup lens Download PDF

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CN114326046B
CN114326046B CN202210093693.8A CN202210093693A CN114326046B CN 114326046 B CN114326046 B CN 114326046B CN 202210093693 A CN202210093693 A CN 202210093693A CN 114326046 B CN114326046 B CN 114326046B
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lens
imaging
optical axis
imaging lens
satisfy
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CN114326046A (en
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张萌
娄琪琪
耿晓婷
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Abstract

The application discloses an imaging lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens to the sixth lens are sequentially arranged from an object side to an image side along an optical axis, and an image side surface of the fourth lens, an object side surface of the fifth lens and an image side surface of the fifth lens are all convex surfaces; and the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: imgH >6.0mm and TTL/ImgH <1.4.

Description

Image pickup lens
Technical Field
The application relates to the field of optical elements, in particular to an imaging lens.
Background
Along with the development of intelligent electronic devices such as mobile phones and the like in a thinner direction, people also put forward higher requirements on the camera lens carried on the intelligent electronic devices, not only are the camera lens required to have higher resolution, but also the camera lens is required to have the characteristic of miniaturization, but the smaller the overall length of the camera lens is, the greater the design difficulty of the camera lens is, and various parameter indexes are difficult to ensure. In order to meet the needs of manufacturers of intelligent devices, imaging lenses with large image surfaces, miniaturization and high imaging quality have become the main development direction of improving the self-competitiveness of many lens manufacturers at present.
Disclosure of Invention
The application provides an imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens satisfies: imgH >6.0mm; and the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens satisfy the following conditions: TTL/ImgH <1.4.
In one embodiment, the entrance pupil diameter EPD of the imaging lens and half the diagonal length of the effective pixel area on the imaging surface of the imaging lens ImgH satisfy: 0.5< EPD/ImgH <0.6.
In one embodiment, the image capturing lens further includes a diaphragm disposed between the object side and the first lens, and a distance TTL between the object side of the first lens and an imaging plane of the image capturing lens on an optical axis and a distance SL between the diaphragm and the imaging plane on an axis satisfy: 0.8< SL/TTL <1.
In one embodiment, the maximum half field angle Semi-FOV of the imaging lens, the effective focal length f 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 satisfy: 0.8< f/(TTL tan (Semi-FOV)) <1.
In one embodiment, the distance BFL between the image side surface of the sixth lens element and the imaging plane and the distance TD between the object side surface of the first lens element and the image side surface of the sixth lens element on the optical axis satisfy the following conditions: 0.2< BFL/TD <0.3.
In one embodiment, the effective focal length f of the imaging lens and the distance TD between the object side surface of the first lens element and the image side surface of the sixth lens element on the optical axis satisfy the following conditions: 0.9< TD/f <1.
In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the effective focal length f of the imaging lens satisfy: 0.85< (R2-R1)/f 1<1.
In one embodiment, the focal length f5 of the fifth lens, the combined focal length f45 of the fourth lens and the fifth lens satisfies: 0.85< f5/f45<1.
In one embodiment, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 0.8< R12/R1<1.
In one embodiment, the center thickness CT1 of the first lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.9< CT1/CT6<1.2.
In one embodiment, the sum Σat of the air intervals on the optical axis between any two adjacent lenses of the first lens element to the sixth lens element and the distance BFL between the image side surface of the sixth lens element and the imaging surface on the optical axis satisfy: 0.8< BFL/ΣAT <1.
In one embodiment, the first lens to the sixth lens each have a center thickness on the optical axis, and any adjacent two lenses of the first lens to the sixth lens have an air gap on the optical axis, and a maximum value CT MAX of the center thickness, a minimum value CT MIN of the center thickness, a maximum value AT MAX of the air gap, and a minimum value AT MIN of the air gap satisfy: 1< (CT MAX-CTMIN)/(ATMAX-ATMIN) <1.2.
In one embodiment, the first lens to the sixth lens each have a center thickness on the optical axis, and the sum Σct of the center thicknesses, the minimum CT MIN of the center thicknesses, and the maximum CT MAX of the center thicknesses satisfy: 0.2< (CT MIN+CTMAX)/(Sigma CT < 0.4).
In one embodiment, the imaging lens further includes a diaphragm located between the object side and the first lens, and a sum Σct of a distance SD of the diaphragm to an image side of the sixth lens on the optical axis and a center thickness of the first lens to the sixth lens on the optical axis satisfies: 1.2< SD/ΣCT <1.4.
In one embodiment, the edge thickness ET2 of the second lens on the optical axis and the edge thickness ET5 of the fifth lens on the optical axis satisfy: 0.9< ET2/ET5<1.1.
In one embodiment, the effective radius DT11 of the object side surface of the first lens and the effective radius DT32 of the image side surface of the third lens satisfy: 0.9< DT11/DT32<1.1.
In one embodiment, the effective radius DT11 of the object side surface of the first lens element, the effective radius DT42 of the image side surface of the fourth lens element, and the effective radius DT62 of the image side surface of the sixth lens element satisfy the following conditions: 0.8< (DT11+DT42)/DT 62<0.9.
The application adopts six lenses, 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 image surface, high resolution, miniaturization, high imaging quality and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
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 is a schematic diagram showing the structure 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 is a schematic diagram showing the structure 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 is a schematic diagram showing the structure of an imaging lens according to embodiment 6 of the present application; and
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.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The image pickup lens according to the exemplary embodiment of the present application may include six lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively. The six lenses are arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the sixth lens can have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have positive or negative optical power; the second lens may have positive or negative optical power; the third lens may have positive or negative optical power; the fourth lens can have positive focal power or negative focal power, and the image side surface of the fourth lens is a convex surface; the fifth lens element with positive or negative optical power has a convex object-side surface and a convex image-side surface; and the sixth lens may have positive or negative optical power. The surface type of the imaging lens is beneficial to ensuring that the distribution of the focal power of the imaging lens is more reasonable under the condition that the size of the imaging lens is reduced and is very important to improving the aberration correction capability of the imaging lens and reducing the sensitivity of the imaging lens.
Half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens satisfies: imgH >6.0mm; and the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens satisfy the following conditions: TTL/ImgH is less than 1.4, the total size of the camera lens can be effectively reduced, a larger field angle is ensured, the ultra-thin characteristic and miniaturization of the camera lens are realized, and the camera lens can be better suitable for more and more ultra-thin electronic products on the market.
In an exemplary embodiment, the imaging lens according to the present application further includes a diaphragm disposed between the object side and the first lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.5< EPD/ImgH <0.6, wherein EPD is the entrance pupil diameter of the camera lens and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the camera lens. Satisfies 0.5< EPD/ImgH <0.6, is favorable for guaranteeing the illumination of the camera lens, can effectively increase the light quantity of the camera lens, enables the camera lens to have higher relative illumination, can well improve the imaging quality of the camera lens in a darker environment, enables the camera lens to have practicability, and is favorable for realizing the characteristic of a large image plane of the camera lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.8< SL/TTL <1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis, and SL is the distance between the diaphragm and the imaging surface on the axis. Satisfying 0.8< SL/TTL <1, being beneficial to controlling the size of the camera lens not to be overlarge and ensuring the ultrathin characteristic of the camera lens.
In an exemplary embodiment, the imaging lens according to the present application may satisfy 0.8< f/(ttl×tan (Semi-FOV)) <1, where Semi-FOV is a maximum half field angle of the imaging lens, f is an effective focal length of the imaging lens, and TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the imaging lens. Satisfying 0.8< f/(TTL-FOV)) <1, is beneficial to effectively reducing the size of the imaging lens and is beneficial to balancing vertical axis chromatic aberration and lateral chromatic aberration of the imaging lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.2< BFL/TD <0.3, wherein BFL is the distance from the image side surface of the sixth lens element to the image plane on the optical axis, and TD is the distance from the object side surface of the first lens element to the image side surface of the sixth lens element on the optical axis. Satisfies the BFL/TD of 0.2< 0.3, is favorable for realizing the characteristic of large image surface of the camera lens, and can avoid the actual processing difficulty caused by too short back focus of the camera lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.9< TD/f <1, wherein f is the effective focal length of the imaging lens, and TD is the distance between the object side surface of the first lens and the image side surface of the sixth lens on the optical axis. Satisfying 0.9< TD/f <1, being favorable for reducing the size of the imaging lens, better balancing the aberration of the imaging lens and enabling the imaging lens to have higher processability.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.85< (R2-R1)/f 1<1, wherein R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and f is the effective focal length of the imaging lens. Satisfying 0.85< (R2-R1)/f 1<1, the imaging lens has better chromatic aberration correction capability, reduces sensitivity, and maintains proper lens length.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.85< f5/f45<1, where f5 is the focal length of the fifth lens and f45 is the combined focal length of the fourth and fifth lenses. Satisfying 0.85< f5/f45<1, being beneficial to effectively reducing aberration of the whole camera lens, reducing sensitivity of the camera lens and avoiding processing difficulty caused by overlarge tilt angle.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.8< R12/R1<1, wherein R1 is the radius of curvature of the object side of the first lens and R12 is the radius of curvature of the image side of the sixth lens. Satisfying 0.8< R12/R1<1, being beneficial to effectively balancing astigmatism and coma between the sixth lens and the first lens, and enabling the imaging lens to keep better imaging quality.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.9< CT1/CT6<1.2, wherein CT1 is the center thickness of the first lens on the optical axis and CT6 is the center thickness of the sixth lens on the optical axis. Satisfying 0.9< CT1/CT6<1.2, not only being beneficial to making the camera lens balance system chromatic aberration and effectively controlling the distortion amount of the lens, but also being beneficial to ensuring the processability of the camera lens, and being beneficial to reducing the size of the camera lens and keeping the ultra-thin characteristic of the camera lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.8< BFL/ΣAT <1, wherein ΣAT is the sum of the air intervals on the optical axis between any adjacent two lenses of the first lens element to the sixth lens element, and BFL is the distance on the optical axis from the image side surface to the imaging surface of the sixth lens element. Satisfying 0.8< BFL/ΣAT <1, is favorable to reducing the sensitivity of the camera lens, and is favorable to keeping the ultrathin characteristic of the camera lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 1< (CT MAX-CTMIN)/(ATMAX-ATMIN) <1.2, wherein the first lens to the sixth lens each have a center thickness on the optical axis, and any adjacent two lenses of the first lens to the sixth lens have an air gap on the optical axis, CT MAX is a maximum value of the center thickness, CT MIN is a minimum value of the center thickness, AT MAX is a maximum value of the air gap, and AT MIN is a minimum value of the air gap. Satisfying 1< (CT MAX-CTMIN)/(ATMAX-ATMIN) <1.2, being favorable to guaranteeing the workability of camera lens, can rationally distribute the meat thickness ratio of each lens (i.e. the ratio of minimum value to maximum value of the thickness of lens), effectively distribute the distance between each lens, make camera lens have better aberration correction ability.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.2< (CT MIN+CTMAX)/(Sigma CT < 0.4), wherein the first lens to the sixth lens respectively have a center thickness on the optical axis, sigma CT is the sum of the center thicknesses, CT MIN is the minimum value of the center thickness, and CT MAX is the maximum value of the center thickness. The lens satisfies the condition that the CT (CT MIN+CTMAX)/(sigma) is less than 0.4, is favorable for controlling the overall uniformity of each lens, ensures that the center thickness of each lens of the imaging lens is reasonably distributed, effectively balances the chromatic aberration and distortion of the imaging lens, and is favorable for avoiding the difficulty in the processing technology caused by the over-thin or over-thick lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 1.2< SD/ΣCT <1.4, wherein SD is the distance between the aperture stop and the image side of the sixth lens element on the optical axis, ΣCT is the sum of the thicknesses of the centers of the first lens element to the sixth lens element on the optical axis. Satisfies 1.2< SD/ΣCT <1.4, is favorable to miniaturization of camera lens, reduces ghost image risk.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.9< ET2/ET5<1.1, where ET2 is the edge thickness of the second lens on the optical axis and ET5 is the edge thickness of the fifth lens on the optical axis. Satisfying 0.9< ET2/ET5<1.1, which is beneficial to ensuring the higher processability of the camera lens and ensuring the performance stability of the camera lens.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.9< DT11/DT32<1.1, where DT11 is the effective radius of the object side of the first lens and DT32 is the effective radius of the image side of the third lens. Satisfying 0.9< D11/DT 32<1.1, not only being favorable to the camera lens to promote the height of formation of image face to promote the effective focal length of camera lens, be favorable to the camera lens to balance the aberration of marginal visual field better again.
In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.8< (dt11+dt42)/DT 62<0.9, wherein DT11 is the effective radius of the object-side surface of the first lens element, DT42 is the effective radius of the image-side surface of the fourth lens element, and DT62 is the effective radius of the image-side surface of the sixth lens element. Satisfies 0.8< (DT 11+DT 42)/DT 62<0.9, is favorable to promoting the technology workability of first lens, fourth lens and sixth lens for the camera lens has higher practicality.
In an exemplary embodiment, the effective focal length f1 of the first lens may be, for example, in the range of 6.31mm to 6.42mm, the effective focal length f2 of the second lens may be, for example, in the range of-20.16 mm to-17.00 mm, the effective focal length f3 of the third lens may be, for example, in the range of 27.86mm to 41.84mm, the effective focal length f4 of the fourth lens may be, for example, in the range of-47.57 mm to-35.68 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of 5.55mm to 5.94mm, the effective focal length f6 of the sixth lens may be, for example, in the range of-4.52 mm to-4.17 mm, and the effective focal length f of the imaging lens may be, for example, in the range of 6.69mm to 6.89 mm. Half of the maximum field angle of the imaging lens Semi-FOV can satisfy: semi-FOV > 42.0. 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 8.11mm < TTL <8.39mm. The aperture value Fno of the imaging lens can satisfy 1.98< Fno <2.05.
In an exemplary embodiment, the image pickup lens according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an imaging lens with continuously variable optical power. The imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the above six lenses. 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 low-order aberration of the imaging lens can be effectively balanced and controlled, and the sensitivity of the tolerance of the imaging lens can be reduced, so that the miniaturization of the imaging lens can be maintained.
In an embodiment of the present application, at least one of the mirror surfaces of each of the first to sixth lenses is an aspherical mirror surface. 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 during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, the object side surface and the image side surface of each of the first lens to the sixth lens are aspherical mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the imaging lens is not limited to include six 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, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In this example, the effective focal length f of the imaging lens is 6.88mm, the effective focal length f1 of the first lens of the imaging lens is 6.41mm, the effective focal length f2 of the second lens is-17.01 mm, the effective focal length f3 of the third lens is 27.87mm, the effective focal length f4 of the fourth lens is-35.74 mm, the effective focal length f5 of the fifth lens is 5.93mm, the effective focal length f6 of the sixth lens is-4.51 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens) is 8.38mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, half the maximum field angle Semi-FOV of the imaging lens is 42.07 °, and the aperture value Fno of the imaging lens is 2.04.
Table 1 shows a basic parameter table of an imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness, and the effective radius are all millimeters (mm).
TABLE 1
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical, and the surface profile 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 a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following tables 2-1 and 2-2 show the higher order coefficients A4、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28 and A 30 that can be used for each of the aspherical mirror faces S1-S12 in example 1.
TABLE 2-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 1.5728E-01 -5.8829E-02 1.5197E-02 -2.5795E-03 2.5881E-04 -1.1629E-05 0.0000E+00
S2 -2.7543E-01 1.1066E-01 -3.0145E-02 5.2888E-03 -5.3605E-04 2.3661E-05 0.0000E+00
S3 3.9618E+00 -2.2912E+00 9.4366E-01 -2.7002E-01 5.0997E-02 -5.7137E-03 2.8752E-04
S4 -3.6244E+00 2.1628E+00 -8.8232E-01 2.3509E-01 -3.7082E-02 2.6968E-03 -1.7502E-05
S5 2.7093E+00 -1.1197E+00 3.1811E-01 -5.9110E-02 6.4634E-03 -3.1455E-04 0.0000E+00
S6 -1.2636E-01 5.4704E-02 -1.6230E-02 3.1635E-03 -3.6597E-04 1.9082E-05 0.0000E+00
S7 2.1915E-03 -5.8589E-04 8.5308E-05 -5.1549E-06 0.0000E+00 0.0000E+00 0.0000E+00
S8 -2.7757E-04 3.5946E-05 -2.6013E-06 8.0420E-08 0.0000E+00 0.0000E+00 0.0000E+00
S9 9.7614E-06 -9.5475E-07 5.6102E-08 -1.7256E-09 1.5429E-11 2.7186E-13 0.0000E+00
S10 -6.2838E-06 5.9794E-07 -3.9147E-08 1.7418E-09 -5.0661E-11 8.7877E-13 -7.0170E-15
S11 -6.0907E-07 4.5259E-08 -2.2984E-09 7.9427E-11 -1.7934E-12 2.3922E-14 -1.4322E-16
S12 4.8342E-07 -2.7193E-08 1.1094E-09 -3.1837E-11 6.0808E-13 -6.9281E-15 3.5580E-17
TABLE 2-2
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 angles of view. Fig. 2D shows a magnification chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the imaging lens provided in embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In this example, the effective focal length f of the imaging lens is 6.71mm, the effective focal length f1 of the first lens of the imaging lens is 6.37mm, the effective focal length f2 of the second lens is-19.40 mm, the effective focal length f3 of the third lens is 33.33mm, the effective focal length f4 of the fourth lens is-39.07 mm, the effective focal length f5 of the fifth lens is 5.57mm, the effective focal length f6 of the sixth lens is-4.18 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens) is 8.12mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, half the maximum field angle Semi-FOV of the imaging lens is 42.83 °, and the aperture value Fno of the imaging lens is 2.02.
Table 3 shows a basic parameter table of the imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness, and the effective radius are all millimeters (mm). Tables 4-1 and 4-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 3 Table 3
Face number A4 A6 A8 A10 A12 A14 A16
S1 -3.8245E-03 2.9368E-02 -1.0344E-01 2.3328E-01 -3.5134E-01 3.6601E-01 -2.6913E-01
S2 -1.5120E-02 -1.6391E-02 9.9340E-02 -2.8059E-01 5.0564E-01 -6.1331E-01 5.1376E-01
S3 -3.3877E-02 6.5623E-02 -3.4577E-01 1.3069E+00 -3.1747E+00 5.2320E+00 -6.0529E+00
S4 -1.3611E-02 -9.9925E-03 1.7814E-01 -8.1676E-01 2.2897E+00 -4.2356E+00 5.3668E+00
S5 -5.9357E-02 3.0693E-01 -1.3109E+00 3.5140E+00 -6.3016E+00 7.8033E+00 -6.7987E+00
S6 -4.9661E-02 4.8588E-02 -5.0890E-02 -2.7278E-02 1.7507E-01 -2.9111E-01 2.8579E-01
S7 -6.4411E-02 2.5235E-02 -1.7586E-02 1.4543E-02 -1.2976E-02 1.0415E-02 -6.6417E-03
S8 -4.6778E-02 5.9872E-03 8.0122E-03 -1.2708E-02 1.0367E-02 -5.3502E-03 1.8124E-03
S9 -2.7853E-03 -2.7253E-03 2.6905E-04 1.0003E-03 -8.3380E-04 3.4092E-04 -8.5812E-05
S10 6.9598E-03 6.8756E-04 1.4063E-03 -1.5465E-03 8.7348E-04 -2.9958E-04 6.5645E-05
S11 -9.1157E-02 3.0570E-02 -7.1454E-03 9.7382E-04 3.2409E-05 -4.2581E-05 8.9779E-06
S12 -1.0389E-01 4.1116E-02 -1.3896E-02 3.6451E-03 -7.2220E-04 1.0716E-04 -1.1877E-05
TABLE 4-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 1.4069E-01 -5.1976E-02 1.3262E-02 -2.2232E-03 2.2031E-04 -9.7774E-06 0.0000E+00
S2 -3.0024E-01 1.2179E-01 -3.3497E-02 5.9336E-03 -6.0719E-04 2.7059E-05 0.0000E+00
S3 5.0037E+00 -2.9699E+00 1.2553E+00 -3.6864E-01 7.1452E-02 -8.2159E-03 4.2430E-04
S4 -4.7370E+00 2.9121E+00 -1.2238E+00 3.3593E-01 -5.4587E-02 4.0897E-03 -2.7343E-05
S5 4.1936E+00 -1.8194E+00 5.4259E-01 -1.0584E-01 1.2149E-02 -6.2064E-04 0.0000E+00
S6 -1.8734E-01 8.4726E-02 -2.6261E-02 5.3477E-03 -6.4632E-04 3.5207E-05 0.0000E+00
S7 2.9670E-03 -8.2037E-04 1.2354E-04 -7.7206E-06 0.0000E+00 0.0000E+00 0.0000E+00
S8 -3.9617E-04 5.3375E-05 -4.0183E-06 1.2923E-07 0.0000E+00 0.0000E+00 0.0000E+00
S9 1.3808E-05 -1.4036E-06 8.5718E-08 -2.7401E-09 2.5463E-11 4.6628E-13 0.0000E+00
S10 -9.5824E-06 9.5558E-07 -6.5565E-08 3.0573E-09 -9.3189E-11 1.6941E-12 -1.4176E-14
S11 -1.0801E-06 8.5536E-08 -4.6292E-09 1.7049E-10 -4.1025E-12 5.8319E-14 -3.7211E-16
S12 9.7955E-07 -5.9599E-08 2.6300E-09 -8.1634E-11 1.6865E-12 -2.0783E-14 1.1545E-16
TABLE 4-2
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 angles of view. Fig. 4D shows a magnification chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens provided in embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In this example, the effective focal length f of the imaging lens is 6.81mm, the effective focal length f1 of the first lens of the imaging lens is 6.36mm, the effective focal length f2 of the second lens is-20.15 mm, the effective focal length f3 of the third lens is 41.83mm, the effective focal length f4 of the fourth lens is-36.93 mm, the effective focal length f5 of the fifth lens is 5.56mm, the effective focal length f6 of the sixth lens is-4.22 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens) is 8.19mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, and half the maximum field angle Semi-FOV of the imaging lens is 42.34 ° and the aperture value Fno of the imaging lens is 2.02.
Table 5 shows a basic parameter table of an imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness, and the effective radius are all millimeters (mm). Tables 6-1 and 6-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 5
Face number A4 A6 A8 A10 A12 A14 A16
S1 -3.9000E-03 3.0243E-02 -1.0756E-01 2.4497E-01 -3.7257E-01 3.9194E-01 -2.9103E-01
S2 -1.5475E-02 -1.6972E-02 1.0406E-01 -2.9737E-01 5.4213E-01 -6.6525E-01 5.6378E-01
S3 -3.3406E-02 6.4259E-02 -3.3622E-01 1.2620E+00 -3.0441E+00 4.9818E+00 -5.7232E+00
S4 -1.3714E-02 -1.0106E-02 1.8085E-01 -8.3230E-01 2.3421E+00 -4.3488E+00 5.5311E+00
S5 -5.8076E-02 2.9705E-01 -1.2549E+00 3.3274E+00 -5.9024E+00 7.2296E+00 -6.2306E+00
S6 -5.0930E-02 5.0462E-02 -5.3524E-02 -2.9054E-02 1.8883E-01 -3.1799E-01 3.1613E-01
S7 -6.9763E-02 2.8444E-02 -2.0630E-02 1.7754E-02 -1.6487E-02 1.3772E-02 -9.1399E-03
S8 -4.9556E-02 6.5283E-03 8.9920E-03 -1.4679E-02 1.2325E-02 -6.5471E-03 2.2827E-03
S9 -2.8331E-03 -2.7957E-03 2.7836E-04 1.0438E-03 -8.7743E-04 3.6182E-04 -9.1852E-05
S10 6.9156E-03 6.8102E-04 1.3885E-03 -1.5221E-03 8.5695E-04 -2.9298E-04 6.3994E-05
S11 -9.0003E-02 2.9991E-02 -6.9657E-03 9.4329E-04 3.1193E-05 -4.0724E-05 8.5318E-06
S12 -1.0329E-01 4.0762E-02 -1.3736E-02 3.5929E-03 -7.0979E-04 1.0501E-04 -1.1606E-05
TABLE 6-1
/>
TABLE 6-2
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 angles of view. Fig. 6D shows a magnification chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens provided in embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In this example, the effective focal length f of the imaging lens is 6.75mm, the effective focal length f1 of the first lens of the imaging lens is 6.32mm, the effective focal length f2 of the second lens is-19.41 mm, the effective focal length f3 of the third lens is 37.49mm, the effective focal length f4 of the fourth lens is-40.06 mm, the effective focal length f5 of the fifth lens is 5.78mm, the effective focal length f6 of the sixth lens is-4.23 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens) is 8.15mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, half the maximum field angle Semi-FOV of the imaging lens is 42.54 °, and the aperture value Fno of the imaging lens is 2.00.
Table 7 shows a basic parameter table of an imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness, and the effective radius are all millimeters (mm). Tables 8-1 and 8-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 7
Face number A4 A6 A8 A10 A12 A14 A16
S1 -3.8118E-03 2.9223E-02 -1.0275E-01 2.3135E-01 -3.4786E-01 3.6179E-01 -2.6558E-01
S2 -1.4938E-02 -1.6096E-02 9.6965E-02 -2.7223E-01 4.8761E-01 -5.8788E-01 4.8948E-01
S3 -3.2756E-02 6.2392E-02 -3.2326E-01 1.2015E+00 -2.8698E+00 4.6506E+00 -5.2904E+00
S4 -1.3452E-02 -9.8182E-03 1.7401E-01 -7.9315E-01 2.2105E+00 -4.0651E+00 5.1207E+00
S5 -5.7967E-02 2.9621E-01 -1.2502E+00 3.3118E+00 -5.8690E+00 7.1820E+00 -6.1837E+00
S6 -5.0621E-02 5.0004E-02 -5.2877E-02 -2.8615E-02 1.8542E-01 -3.1129E-01 3.0853E-01
S7 -6.9466E-02 2.8263E-02 -2.0454E-02 1.7566E-02 -1.6278E-02 1.3568E-02 -8.9853E-03
S8 -4.9018E-02 6.4223E-03 8.7979E-03 -1.4284E-02 1.1928E-02 -6.3018E-03 2.1852E-03
S9 -2.7711E-03 -2.7046E-03 2.6632E-04 9.8764E-04 -8.2113E-04 3.3488E-04 -8.4078E-05
S10 6.7320E-03 6.5409E-04 1.3158E-03 -1.4231E-03 7.9050E-04 -2.6665E-04 5.7465E-05
S11 -8.9806E-02 2.9893E-02 -6.9353E-03 9.3815E-04 3.0989E-05 -4.0413E-05 8.4575E-06
S12 -1.0267E-01 4.0397E-02 -1.3573E-02 3.5395E-03 -6.9716E-04 1.0284E-04 -1.1331E-05
TABLE 8-1
/>
TABLE 8-2
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 angles of view. Fig. 8D shows a magnification chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens provided in embodiment 4 can achieve good imaging quality.
Example 5
An imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In this example, the effective focal length f of the imaging lens is 6.70mm, the effective focal length f1 of the first lens of the imaging lens is 6.37mm, the effective focal length f2 of the second lens is-18.81 mm, the effective focal length f3 of the third lens is 31.98mm, the effective focal length f4 of the fourth lens is-47.56 mm, the effective focal length f5 of the fifth lens is 5.91mm, the effective focal length f6 of the sixth lens is-4.25 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens) is 8.13mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens is 6.36mm, half the maximum field angle Semi-FOV of the imaging lens is 42.90 °, and the aperture value Fno of the imaging lens is 1.99.
Table 9 shows a basic parameter table of an imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness, and the effective radius are all millimeters (mm). Tables 10-1 and 10-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 9
Face number A4 A6 A8 A10 A12 A14 A16
S1 -3.6375E-03 2.7241E-02 -9.3570E-02 2.0580E-01 -3.0228E-01 3.0712E-01 -2.2023E-01
S2 -1.4041E-02 -1.4668E-02 8.5670E-02 -2.3319E-01 4.0495E-01 -4.7333E-01 3.8209E-01
S3 -3.2307E-02 6.1112E-02 -3.1445E-01 1.1607E+00 -2.7533E+00 4.4311E+00 -5.0060E+00
S4 -1.2982E-02 -9.3083E-03 1.6207E-01 -7.2569E-01 1.9868E+00 -3.5895E+00 4.4419E+00
S5 -5.8463E-02 3.0002E-01 -1.2716E+00 3.3830E+00 -6.0209E+00 7.3993E+00 -6.3980E+00
S6 -4.9349E-02 4.8131E-02 -5.0253E-02 -2.6851E-02 1.7179E-01 -2.8476E-01 2.7867E-01
S7 -6.4591E-02 2.5341E-02 -1.7684E-02 1.4645E-02 -1.3086E-02 1.0518E-02 -6.7165E-03
S8 -4.6228E-02 5.8818E-03 7.8248E-03 -1.2338E-02 1.0005E-02 -5.1330E-03 1.7286E-03
S9 -2.6212E-03 -2.4880E-03 2.3827E-04 8.5939E-04 -6.9490E-04 2.7563E-04 -6.7302E-05
S10 6.6820E-03 6.4681E-04 1.2963E-03 -1.3968E-03 7.7302E-04 -2.5979E-04 5.5777E-05
S11 -8.8494E-02 2.9240E-02 -6.7340E-03 9.0424E-04 2.9650E-05 -3.8383E-05 7.9738E-06
S12 -1.0146E-01 3.9682E-02 -1.3253E-02 3.4356E-03 -6.7268E-04 9.8637E-05 -1.0804E-05
TABLE 10-1
/>
TABLE 10-2
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 angles of view. Fig. 10D shows a magnification chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens provided in embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is 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 filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In this example, the effective focal length f of the imaging lens is 6.78mm, the effective focal length f1 of the first lens of the imaging lens is 6.40mm, the effective focal length f2 of the second lens is-19.40 mm, the effective focal length f3 of the third lens is 30.90mm, the effective focal length f4 of the fourth lens is-35.69 mm, the effective focal length f5 of the fifth lens is 5.78mm, the effective focal length f6 of the sixth lens is-4.34 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens) is 8.22mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, half the maximum field angle of the imaging lens Semi-FOV is 42.48 °, and the aperture value Fno of the imaging lens is 2.01.
Table 11 shows a basic parameter table of an imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness, and the effective radius are all millimeters (mm). Tables 12-1 and 12-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 11
Face number A4 A6 A8 A10 A12 A14 A16
S1 -3.5110E-03 2.5833E-02 -8.7175E-02 1.8837E-01 -2.7183E-01 2.7133E-01 -1.9116E-01
S2 -1.3324E-02 -1.3560E-02 7.7147E-02 -2.0456E-01 3.4605E-01 -3.9402E-01 3.0985E-01
S3 -3.1007E-02 5.7463E-02 -2.8967E-01 1.0475E+00 -2.4343E+00 3.8381E+00 -4.2480E+00
S4 -1.2323E-02 -8.6088E-03 1.4604E-01 -6.3711E-01 1.6995E+00 -2.9914E+00 3.6066E+00
S5 -5.6194E-02 2.8273E-01 -1.1749E+00 3.0644E+00 -5.3470E+00 6.4424E+00 -5.4614E+00
S6 -4.7804E-02 4.5888E-02 -4.7155E-02 -2.4798E-02 1.5615E-01 -2.5475E-01 2.4537E-01
S7 -6.2365E-02 2.4042E-02 -1.6487E-02 1.3416E-02 -1.1779E-02 9.3029E-03 -5.8375E-03
S8 -4.4666E-02 5.5861E-03 7.3048E-03 -1.1321E-02 9.0242E-03 -4.5510E-03 1.5065E-03
S9 -2.6150E-03 -2.4792E-03 2.3715E-04 8.5435E-04 -6.9001E-04 2.7337E-04 -6.6672E-05
S10 6.6608E-03 6.4374E-04 1.2881E-03 -1.3857E-03 7.6569E-04 -2.5691E-04 5.5073E-05
S11 -8.7178E-02 2.8590E-02 -6.5352E-03 8.7100E-04 2.8347E-05 -3.6422E-05 7.5099E-06
S12 -9.7885E-02 3.7604E-02 -1.2336E-02 3.1410E-03 -6.0407E-04 8.7003E-05 -9.3600E-06
TABLE 12-1
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TABLE 12-2
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 angles of view. Fig. 12D shows a magnification chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens provided in embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 satisfy the relationships shown in table 13, respectively.
Condition/example 1 2 3 4 5 6
TTL/ImgH 1.32 1.28 1.29 1.29 1.28 1.30
EPD/ImgH 0.53 0.52 0.53 0.53 0.53 0.53
SL/TTL 0.92 0.89 0.90 0.89 0.89 0.89
f/(TTL*tan(Semi-FOV)) 0.91 0.89 0.91 0.90 0.89 0.90
BFL/TD 0.28 0.29 0.29 0.28 0.28 0.29
TD/f 0.95 0.94 0.93 0.94 0.95 0.94
(R2-R1)/f1 0.92 0.89 0.87 0.93 0.95 0.97
f5/f45 0.88 0.90 0.89 0.90 0.91 0.89
R12/R1 0.93 0.88 0.89 0.89 0.88 0.91
CT1/CT6 0.98 1.13 1.08 1.09 1.10 1.14
BFL/∑AT 0.88 0.88 0.90 0.84 0.83 0.86
(CTMAX-CTMIN)/(ATMAX-ATMIN) 1.10 1.09 1.05 1.01 1.00 1.06
(CTMIN+CTMAX)/∑CT 0.29 0.31 0.31 0.31 0.31 0.31
SD/∑CT 1.32 1.27 1.28 1.28 1.29 1.29
ET2/ET5 0.93 1.02 0.98 0.97 1.03 1.06
DT11/DT32 0.99 1.05 1.05 1.06 1.07 1.07
(DT11+DT42)/DT62 0.83 0.84 0.84 0.82 0.84 0.87
TABLE 13
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (14)

1. An imaging lens comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens to the sixth lens are sequentially arranged from an object side to an image side along an optical axis,
It is characterized in that the method comprises the steps of,
The first, third, and fifth lenses have positive optical power, and the second, fourth, and sixth lenses have negative optical power;
The object side surfaces of the first lens and the second lens are convex, and the image side surfaces are concave;
The image side surface of the third lens is a convex surface;
The object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface;
The object side surface of the fifth lens and the image side surface of the fifth lens are both convex surfaces;
the image side surface of the sixth lens is a concave surface;
the number of lenses with focal power in the imaging lens is six;
The focal length f5 of the fifth lens, the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.85< f5/f45<1;
The radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.8< R12/R1<1;
The sum Σat of the air intervals on the optical axis between any two adjacent lenses of the first lens and the sixth lens and the distance BFL between the image side surface of the sixth lens and the imaging surface of the imaging lens on the optical axis satisfy the following conditions: 0.8< BFL/ΣAT <1;
The distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: imgH >6.0mm; and 1< TTL/ImgH <1.4.
2. The imaging lens according to claim 1, wherein an entrance pupil diameter EPD of the imaging lens and a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the imaging lens satisfy: 0.5< EPD/ImgH <0.6.
3. The imaging lens according to claim 1, further comprising a stop located between the object side and the first lens, a distance TTL on the optical axis from the object side of the first lens to the imaging surface and an on-axis distance SL from the stop to the imaging surface satisfying: 0.8< SL/TTL <1.
4. The imaging lens as claimed in claim 1, wherein a maximum half field angle Semi-FOV of the imaging lens, an effective focal length f 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: 0.8< f/(TTL tan (Semi-FOV)) <1.
5. The imaging lens as claimed in claim 1, wherein a distance BFL from an image side surface of the sixth lens element to the imaging surface on the optical axis and a distance TD from an object side surface of the first lens element to the image side surface of the sixth lens element on the optical axis satisfy: 0.2< BFL/TD <0.3.
6. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens and a distance TD on the optical axis from an object side surface of the first lens element to an image side surface of the sixth lens element satisfy: 0.9< TD/f <1.
7. The imaging lens according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens, a radius of curvature R2 of an image side surface of the first lens, and an effective focal length f of the imaging lens satisfy: 0.85< (R2-R1)/f 1<1.
8. The imaging lens according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0.9< CT1/CT6<1.2.
9. The imaging lens according to claim 1, wherein the first to sixth lenses each have a center thickness on the optical axis, and any adjacent two of the first to sixth lenses have an air gap on the optical axis, a maximum value CT MAX of the center thickness, a minimum value CT MIN of the center thickness, a maximum value AT MAX of the air gap, and a minimum value AT MIN of the air gap satisfy: 1< (CT MAX-CTMIN)/(ATMAX-ATMIN) <1.2.
10. The imaging lens according to claim 1, wherein the first to sixth lenses each have a center thickness on the optical axis, a sum Σct of the center thicknesses, a minimum value CT MIN of the center thicknesses, and a maximum value CT MAX of the center thicknesses satisfy: 0.2< (CT MIN+CTMAX)/(Sigma CT < 0.4).
11. The imaging lens according to claim 3, wherein a sum Σct of a distance SD of the diaphragm to an image side surface of the sixth lens on the optical axis and a center thickness of the first lens to the sixth lens on the optical axis satisfies: 1.2< SD/ΣCT <1.4.
12. The imaging lens according to claim 1, wherein an edge thickness ET2 of the second lens on the optical axis and an edge thickness ET5 of the fifth lens on the optical axis satisfy: 0.9< ET2/ET5<1.1.
13. The imaging lens according to claim 1, wherein an effective radius DT11 of an object side surface of the first lens and an effective radius DT32 of an image side surface of the third lens satisfy: 0.9< DT11/DT32<1.1.
14. The imaging lens according to claim 1, wherein an effective radius DT11 of an object side surface of the first lens, an effective radius DT42 of an image side surface of the fourth lens, and an effective radius DT62 of an image side surface of the sixth lens satisfy: 0.8< (DT11+DT42)/DT 62<0.9.
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CN106802469A (en) * 2016-12-14 2017-06-06 瑞声科技(新加坡)有限公司 Camera optical camera lens
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