CN114326046A - Camera lens - Google Patents

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CN114326046A
CN114326046A CN202210093693.8A CN202210093693A CN114326046A CN 114326046 A CN114326046 A CN 114326046A CN 202210093693 A CN202210093693 A CN 202210093693A CN 114326046 A CN114326046 A CN 114326046A
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lens
imaging
image
imaging lens
optical axis
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CN114326046B (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 a camera 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 the image side surface of the fourth lens, the object side surface of the fifth lens and the image side surface of the fifth lens are convex surfaces; and the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: ImgH >6.0mm and TTL/ImgH < 1.4.

Description

Camera lens
Technical Field
The present application relates to the field of optical elements, and in particular, to an imaging lens.
Background
With the development of smart electronic devices such as mobile phones towards thinner and thinner directions, people also put forward higher and higher requirements on the camera lens carried on the smart electronic devices, and the camera lens is required to have the characteristics of higher resolution and miniaturization. In order to meet the requirements of manufacturers of intelligent devices, camera lenses with large image planes, miniaturization and high imaging quality have become the main development direction for various lens manufacturers to improve their competitiveness.
Disclosure of Invention
The application provides an imaging lens, which 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 of the fifth lens is a convex surface; the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the camera lens satisfies: ImgH >6.0 mm; and the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the camera lens satisfy that: TTL/ImgH < 1.4.
In one embodiment, the entrance pupil diameter EPD of the imaging lens and the half of the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging lens satisfy: 0.5< EPD/ImgH < 0.6.
In one embodiment, the imaging lens further includes a stop located between the object side and the first lens, and a distance TTL on an optical axis from an object side surface of the first lens to an imaging surface of the imaging lens and an on-axis distance SL from the stop to the imaging surface 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, a distance BFL on the optical axis from the image-side surface of the sixth lens element to the image plane and a distance TD on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element satisfy: 0.2< BFL/TD < 0.3.
In one embodiment, the effective focal length f of the imaging lens and the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens satisfy: 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)/f1< 1.
In one embodiment, the focal length f5 of the fifth lens, and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.85< f5/f45 <1.
In one embodiment, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.8< R12/R1< 1.
In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.9< CT1/CT6< 1.2.
In one embodiment, a sum Σ AT of air intervals on an optical axis between any adjacent two lenses of the first lens to the sixth lens and a distance BFL on the optical axis from an image side surface of the sixth lens to an image forming surface satisfy: 0.8< BFL/SIGMA AT <1.
In one embodiment, the first to sixth lenses respectively have a center thickness on an optical axis, and any adjacent two of the first to sixth lenses have an air space on the optical axis, a maximum value CT of the center thicknessMAXMinimum value of center thickness CTMINMaximum value of air space ATMAXMinimum value of air separation ATMINSatisfies the following conditions: 1<(CTMAX-CTMIN)/(ATMAX-ATMIN)<1.2。
In one embodiment, the first to sixth lenses have center thicknesses on the optical axis, respectively, a sum Σ CT of the center thicknesses, and a minimum value CT of the center thicknessesMINMaximum value of the center thickness CTMAXSatisfies the following conditions: 0.2<(CTMIN+CTMAX)/∑CT<0.4。
In one embodiment, the imaging lens further includes a stop located between the object side and the first lens, and a sum Σ CT of a distance SD of the stop 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/SIGMA CT < 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, 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)/DT62< 0.9.
The imaging lens system has the advantages that the six lenses are adopted, the focal power, the surface type and the center thickness of each lens and the on-axis distance between the lenses are reasonably distributed, and the like, so that the imaging lens system 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 following detailed description of non-limiting embodiments thereof, 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 axial 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 axial 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 axial 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 is a schematic configuration diagram showing 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 configuration diagram showing 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 configuration diagram showing an imaging lens according to embodiment 6 of the present application; and
fig. 12A to 12D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens of example 6.
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 the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present 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 this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
An image pickup lens according to an exemplary embodiment of the present application may include six lenses having optical powers, 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 along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the sixth lens can have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have a positive power or a negative power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power or a 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 can have positive focal power or negative focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; and the sixth lens may have a positive power or a negative power. The surface type arrangement of the camera lens is beneficial to ensuring that the distribution of the focal power of the camera lens is more reasonable under the condition that the size of the camera lens is reduced and is not too large, and is vital to improving the aberration correction capability of the camera lens and reducing the sensitivity of the camera lens.
The half ImgH of the diagonal length of the effective pixel area on the imaging surface of the camera lens satisfies: ImgH >6.0 mm; and the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the camera lens satisfy that: TTL/ImgH is less than 1.4, the total size of the camera lens can be effectively reduced, a larger field angle is ensured, and the ultrathin characteristic and miniaturization of the camera lens are realized, so that the camera lens can be better suitable for more and more ultrathin electronic products in the market.
In an exemplary embodiment, an imaging lens according to the present application further includes a stop disposed between the object side and the first lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.5< EPD/ImgH <0.6, where EPD is the entrance pupil diameter of the imaging lens and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens. Satisfy 0.5< EPD/imgH <0.6, be favorable to guaranteeing camera lens's illuminance, can increase camera lens's luminous flux effectively, make it possess higher relative illuminance, promotion camera lens that can be fine is the imaging quality under the darker environment, lets camera lens more have the practicality, is favorable to realizing camera lens's the characteristic of big image plane simultaneously.
In an exemplary embodiment, an imaging lens according to the present application may 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 camera lens on the optical axis, and SL is the distance between the diaphragm and the imaging surface on the axis. The requirement that SL/TTL is more than 0.8 is less than 1 is favorable for controlling the size of the camera lens not to be too large, and the ultrathin characteristic of the camera lens is ensured.
In an exemplary embodiment, an 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 _ tan (Semi-FOV)) <1 is advantageous to effectively reduce the size of the camera lens and to balance vertical axis chromatic aberration and lateral chromatic aberration of the camera lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.2< BFL/TD <0.3, wherein BFL is the distance on the optical axis from the image side surface of the sixth lens element to the image plane, and TD is the distance on the optical axis from the object side surface of the first lens element to the image side surface of the sixth lens element. The requirement that BFL/TD is less than 0.2 and less than 0.3 is met, the characteristic of a large image plane of the camera lens is favorably realized, and the actual processing difficulty caused by over-short back focus of the camera lens can be avoided.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.9< TD/f <1, where f is an effective focal length of the imaging lens, and TD is a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the sixth lens element. The requirement that TD/f is less than 0.9 is met, so that the size of the camera lens is reduced, the aberration of the camera lens is balanced better, and the camera lens has higher processability.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.85< (R2-R1)/f1<1, wherein R1 is a radius of curvature of an object side surface of the first lens, R2 is a radius of curvature of an image side surface of the first lens, and f is an effective focal length of the imaging lens. The requirement of 0.85< (R2-R1)/f1<1 is met, so that the photographic lens has good chromatic aberration correction capability, the sensitivity of the photographic lens is reduced, and the photographic lens is kept in a proper lens length.
In an exemplary embodiment, an imaging lens according to the present application may 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. The optical aberration-reducing lens meets the requirement that f5/f45 is 0.85< f5/f45<1, is favorable for effectively reducing the aberration of the whole camera lens, reduces the sensitivity of the camera lens and avoids processing difficulty caused by overlarge surface inclination angle.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.8< R12/R1<1, wherein R1 is a radius of curvature of an object-side surface of the first lens, and R12 is a radius of curvature of an image-side surface of the sixth lens. The requirements of 0.8< R12/R1<1 are favorable for effectively balancing astigmatism and coma aberration between the sixth lens and the first lens, so that the camera lens can keep better imaging quality.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.9< CT1/CT6<1.2, where CT1 is the central thickness of the first lens on the optical axis and CT6 is the central thickness of the sixth lens on the optical axis. The requirement that the color difference of a camera lens balance system is 0.9< CT1/CT6<1.2 is met, so that the camera lens balance system is favorable for enabling the color difference of the camera lens balance system to effectively control the distortion quantity of the camera lens, the machinability of the camera lens is also favorable for ensuring the machinability of the camera lens, and the size of the camera lens can be reduced to keep the ultrathin characteristic of the camera lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.8< BFL/SIGMA AT <1, wherein SIGMA AT is the sum of air spaces between any two adjacent lenses from the first lens to the sixth lens on the optical axis, and BFL is the distance from the image side surface of the sixth lens to the imaging surface on the optical axis. The requirement of 0.8< BFL/sigma AT <1 is met, the sensitivity of the camera lens is favorably reduced, and the ultra-thin characteristic of the camera lens is favorably kept.
In an exemplary embodimentIn the formula, the imaging lens according to the present application can satisfy: 1<(CTMAX-CTMIN)/(ATMAX-ATMIN)<1.2, wherein the first lens to the sixth lens have center thicknesses on the optical axes, respectively, and any two adjacent lenses of the first lens to the sixth lens have an air space on the optical axis, CTMAXIs the maximum value of the center thickness, CTMINIs the minimum value of the center thickness, ATMAXIs the maximum value of the air space, ATMINIs the minimum value of the air space. Satisfies 1<(CTMAX-CTMIN)/(ATMAX-ATMIN)<1.2, the processability of the camera lens is guaranteed, the thickness ratio of each lens (namely the ratio of the minimum thickness to the maximum thickness of the lens) can be reasonably distributed, and the distance between each lens is effectively distributed, so that the camera lens has better aberration correction capability.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.2<(CTMIN+CTMAX)/∑CT<0.4, wherein the first lens to the sixth lens have center thicknesses on the optical axes, respectively, Σ CT being the sum of the center thicknesses, CTMINAt minimum of center thickness, CTMAXThe maximum value of the center thickness. Satisfies 0.2<(CTMIN+CTMAX)/∑CT<And 0.4, the overall uniformity of each lens is favorably controlled, the central thickness of each lens of the camera lens is reasonably distributed, the chromatic aberration and the distortion of the camera lens are effectively balanced, and the difficulty in the aspect of processing technology caused by over-thin or over-thick lenses is favorably avoided.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.2< SD/∑ CT <1.4, where SD is the distance on the optical axis from the stop to the image-side surface of the sixth lens, and Σ CT is the sum of the central thicknesses on the optical axis of the first lens to the sixth lens. The requirement that 1.2< SD/Sigma CT <1.4 is met, the miniaturization of the camera lens is facilitated, and the ghost risk is reduced.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.9< ET2/ET5<1.1, wherein ET2 is the edge thickness of the second lens in the optical axis and ET5 is the edge thickness of the fifth lens in the optical axis. The requirements that 0.9< ET2/ET5<1.1 are met, and the high processability and the performance stability of the camera lens are both favorably ensured.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.9< DT11/DT32<1.1, where DT11 is the effective radius of the object side surface of the first lens and DT32 is the effective radius of the image side surface of the third lens. The optical lens meets the requirement that DT11/DT32 is 0.9< 1.1, the height of an imaging surface of the optical lens is improved, the effective focal length of the optical lens is improved, and the optical lens is favorable for balancing the aberration of the marginal field of view better.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.8< (DT11+ DT42)/DT62<0.9, where DT11 is the effective radius of the object-side face of the first lens, DT42 is the effective radius of the image-side face of the fourth lens, and DT62 is the effective radius of the image-side face of the sixth lens. The requirements of 0.8< (DT11+ DT42)/DT62<0.9 are met, the process processability of the first lens, the fourth lens and the sixth lens is improved, and the camera lens has higher practicability.
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 and-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 camera lens may be, for example, in the range of 6.69mm to 6.89 mm. Half of the Semi-FOV of the maximum field angle of the camera lens may satisfy: Semi-FOV > 42.0. The TTL of the distance on the optical axis from the object-side surface of the first lens element to the image plane of the camera lens can satisfy 8.11mm < TTL <8.39 mm. The aperture value Fno of the camera lens may satisfy 1.98< Fno < 2.05.
In an exemplary embodiment, an imaging 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 a camera lens with continuously variable focal power. The imaging lens according to the above-described 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 type, the central thickness of each lens, the on-axis distance between each lens and the like, the low-order aberration of the camera lens can be effectively balanced and controlled, meanwhile, the tolerance sensitivity can be reduced, and the miniaturization of the camera lens can be kept.
In the 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 aspheric 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 better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, the object-side surface and the image-side surface of each of the first lens to the sixth lens are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting an imaging lens may be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the imaging lens is not limited to including six lenses. The camera lens may also include other numbers of lenses, if desired.
Specific examples of an 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 imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present 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, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, the half semifov of the maximum field angle of the imaging lens is 42.07 mm, and the aperture value f no 2.04 of the imaging lens.
Table 1 shows a basic parameter table of the imaging lens of embodiment 1, in which the units of the curvature radius, the thickness, and the effective radius are all millimeters (mm).
Figure BDA0003490221860000081
TABLE 1
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
Figure BDA0003490221860000082
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 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 i-th order of the aspherical surface. The high-order term coefficients A usable for the aspherical mirror surfaces S1 to S12 in example 1 are shown in Table 2-1 and Table 2-2 below4、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Figure BDA0003490221860000083
Figure BDA0003490221860000091
TABLE 2-1
Flour mark 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
Tables 2 to 2
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. 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 chromatic aberration of magnification curve of the imaging lens of embodiment 1, which represents a 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 system according to 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 parts similar to those of embodiment 1 will be omitted for the sake of 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 includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present 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, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, the half semifov of the maximum field angle of the imaging lens is 42.83 mm, and the aperture value f3 of the imaging lens is no 2.02.
Table 3 shows a basic parameter table of the imaging lens of embodiment 2, in which the units of the curvature radius, the thickness, and the effective radius are all millimeters (mm). Tables 4-1 and 4-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
Figure BDA0003490221860000101
TABLE 3
Flour mark 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
Flour mark 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 represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. 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 chromatic aberration of magnification curve of the imaging lens of embodiment 2, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens according to 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 includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present 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, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, the half semifov of the maximum field angle 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 the imaging lens of embodiment 3, in which the units of the curvature radius, the thickness, and the effective radius are all millimeters (mm). Tables 6-1 and 6-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
Figure BDA0003490221860000121
TABLE 5
Flour mark 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
Figure BDA0003490221860000122
Figure BDA0003490221860000131
TABLE 6-2
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. 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 chromatic aberration of magnification curve of the imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens system according to 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 includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present 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 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 TTL imaging surface S15 of the imaging lens) is 8.15mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, half semifov-FOV of the maximum field angle of the imaging lens is 42.54 °, and the aperture value f of the imaging lens is 2.00.
Table 7 shows a basic parameter table of the imaging lens of embodiment 4, in which the units of the curvature radius, the thickness, and the effective radius are all millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
Figure BDA0003490221860000141
TABLE 7
Flour mark 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
Figure BDA0003490221860000142
Figure BDA0003490221860000151
TABLE 8-2
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 4. 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 chromatic aberration of magnification curve of the imaging lens of embodiment 4, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens system according to 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 includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
In the present 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, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the imaging lens is 6.36mm, the half semifov of the maximum field angle of the imaging lens is 42.90 mm, and the aperture value f of the imaging lens is no 1.99.
Table 9 shows a basic parameter table of the imaging lens of embodiment 5, in which the units of the curvature radius, the thickness, and the effective radius are all millimeters (mm). Tables 10-1 and 10-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
Figure BDA0003490221860000161
TABLE 9
Flour mark 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
Figure BDA0003490221860000162
Figure BDA0003490221860000171
TABLE 10-2
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. 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 chromatic aberration of magnification curve of the imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens according to 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 includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The 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 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 ImgH of the diagonal line length of the effective pixel area on the imaging surface S15 of the imaging lens is 6.34mm, half mi-FOV of the maximum field angle of the imaging lens is 42.48 °, and the aperture value Fno of the imaging lens is 2.01.
Table 11 shows a basic parameter table of the imaging lens of embodiment 6, in which the units of the curvature radius, the thickness, and the effective radius are all millimeters (mm). Tables 12-1 and 12-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
Figure BDA0003490221860000181
TABLE 11
Flour mark 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
Figure BDA0003490221860000182
Figure BDA0003490221860000191
TABLE 12-2
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 6. 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 chromatic aberration of magnification curve of the imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens according to embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 each satisfy the relationship shown in table 13.
Conditions/examples 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
Watch 13
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. An imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element, wherein the first lens element to the sixth lens element are sequentially disposed along an optical axis from an object side to an image side,
it is characterized in that the preparation method is characterized in that,
the image side surface of the fourth lens, the object side surface of the fifth lens and the image side surface of the fifth lens are convex surfaces; and
the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that:
ImgH >6.0 mm; and
TTL/ImgH<1.4。
2. the imaging lens of claim 1, wherein an entrance pupil diameter EPD of the imaging lens and a half ImgH of a diagonal length of an effective pixel area on an imaging plane of the imaging lens satisfy: 0.5< EPD/ImgH < 0.6.
3. The imaging lens according to claim 1, wherein the imaging lens further comprises a stop located between the object side and the first lens, a distance TTL on the optical axis from an object side surface of the first lens to the imaging surface and an on-axis distance SL from the stop to the imaging surface satisfy: 0.8< SL/TTL <1.
4. The imaging lens according to 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 according to claim 1, wherein a distance BFL between an image-side surface of the sixth lens element and the imaging surface on the optical axis and a distance TD between an object-side surface of the first lens element and 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 to an image side surface of the sixth lens 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)/f1< 1.
8. The imaging lens according to claim 1, wherein a focal length f5 of the fifth lens, a combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.85< f5/f45 <1.
9. 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 R12 of an image-side surface of the sixth lens satisfy: 0.8< R12/R1< 1.
10. 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.
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