CN111399175B - Imaging lens - Google Patents

Imaging lens Download PDF

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CN111399175B
CN111399175B CN202010280798.5A CN202010280798A CN111399175B CN 111399175 B CN111399175 B CN 111399175B CN 202010280798 A CN202010280798 A CN 202010280798A CN 111399175 B CN111399175 B CN 111399175B
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lens
imaging
imaging lens
focal length
effective focal
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CN111399175A (en
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张凯元
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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Abstract

The application discloses 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. The first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has focal power; the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface; the fifth lens has focal power; the sixth lens has focal power, wherein the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens meet f/f6 is more than or equal to-1.63 and less than or equal to 0.12; and the curvature radius R8 of the image side surface of the fourth lens and the total effective focal length f meet the condition that R8/f is more than or equal to-2.36 and less than or equal to-0.53.

Description

Imaging lens
Divisional application
The application is a divisional application of a Chinese invention patent application with the invention name of "imaging lens" and the application number of 201710414137.5, which is filed on 6, month and 5 days in 2017.
Technical Field
The present invention relates to an imaging lens, and more particularly, to an imaging lens including six lenses.
Background
In recent years, with the improvement of performance and size reduction of devices such as a common photosensitive Device CCD (Charge-Coupled Device) and a CMOS (Complementary Metal-Oxide Semiconductor Device), higher demands have been made on high imaging quality and miniaturization of a lens used in cooperation therewith.
With the popularization of portable electronic products, people have increasingly demanded image quality of portable electronic products with an image pickup function.
In order to adapt to the trend of light and thin portable electronic products such as mobile phones and tablet computers, the imaging lens used in cooperation with the mobile phone also needs to meet the requirement of miniaturization. In order to satisfy the miniaturization of the imaging lens, it is generally necessary to reduce the number of lenses of the imaging lens as much as possible, but the lack of freedom in design caused thereby makes it difficult for the imaging lens to satisfy the market demand for high imaging performance.
In addition, in order to obtain an image with a wide viewing angle, a wide-angle optical system is generally adopted in the current mainstream imaging lens, but the wide-angle optical system is not beneficial to shooting a distant object, a clear image at a distant position cannot be obtained, and user experience is not good.
In order to solve the above problems, a double-shot technique has been developed, in which a high spatial and angular resolution is obtained by a telephoto lens, and then high-frequency information enhancement is realized by an image fusion technique. However, in the double-shot technology, the design of the telephoto lens is particularly critical, and how to design the lens to satisfy both the telephoto characteristic and the ultra-thin characteristic is an urgent problem to be solved.
Disclosure of Invention
The present invention provides an imaging lens applicable to portable electronic products that can solve at least or partially at least one of the above-mentioned disadvantages of the related art.
An aspect of the present application provides an imaging lens including, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has focal power; the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface; the fifth lens has focal power; the sixth lens has focal power, wherein the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens can satisfy f/f6 is more than or equal to-1.63 and less than or equal to 0.12; and the curvature radius R8 and the total effective focal length f of the image side surface of the fourth lens can satisfy that R8/f is more than or equal to-2.36 and less than or equal to-0.53.
In one embodiment, f/EPD ≦ 2.7 may be satisfied between the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens.
In one embodiment, the total effective focal length f of the imaging lens and the central thickness CT6 of the sixth lens on the optical axis can satisfy f/CT6 ≧ 15.
In one embodiment, a central thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens at the maximum radius may satisfy CT6/ET6< 1.3.
In one embodiment, the central thickness CT4 of the fourth lens on the optical axis and the total effective focal length f of the imaging lens can satisfy 0< CT4/f < 0.5.
In one embodiment, the third lens and the fourth lens may satisfy 0< T34/f <0.2 between an air interval T34 on an optical axis and a total effective focal length f of the imaging lens.
In one embodiment, 0< f4/f3<0.5 may be satisfied between the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens.
In one embodiment, a radius of curvature R1 of the object side surface of the first lens and a total effective focal length f of the imaging lens satisfy 0< R1/f < 0.5.
In one embodiment, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens may satisfy | R1/R2| < 0.5.
In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and the total effective focal length f can satisfy that TTL/f is less than or equal to 1.05.
In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens on an optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens satisfy TTL/ImgH ≦ 2.0.
Another aspect of the present application provides an imaging lens including, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has focal power; the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface; the fifth lens has focal power; the sixth lens has focal power, wherein the total effective focal length f and the central thickness CT6 of the sixth lens on the optical axis can meet f/CT6 not less than 15, and the total effective focal length f of the imaging lens, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens can meet f/f5+ f/f6 not more than-1.55 and not more than-0.1.
The imaging lens can achieve the effect of telephoto while meeting the requirement of miniaturization by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens and the air interval of each lens on the optical axis, for example, adopting a plurality of (for example, six) lenses.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 1;
fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the imaging lens of embodiment 2, respectively;
fig. 5 is a schematic structural view showing 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 an 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 an imaging lens of embodiment 4;
fig. 9 is a schematic view showing a 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 an imaging lens of embodiment 5;
fig. 11 is a schematic structural view showing an imaging lens according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an imaging lens of embodiment 6;
fig. 13 is a schematic structural view showing an imaging lens according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an imaging lens of embodiment 7;
fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens of embodiment 8.
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, and the surface of each lens closest to the image plane is called the image side surface.
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 imaging lens according to an exemplary embodiment of the present application includes, for example, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens may have a negative optical power; the third lens to the sixth lens may have positive power or negative power. Through reasonable distribution of focal power, the distribution of low-order aberration of a system and good optical image quality are favorably realized, and the ultrathin function is favorably realized.
In use, the first lens provides the primary positive power required by the overall optical system, and most of the positive power is concentrated on the object side of the first lens. By restricting the curvature radius of the object-side surface of the first lens within a reasonable range, the focal power of the whole optical system can be ensured, and a large amount of spherical aberration can not be generated due to too strong bending of the object-side surface of the first lens, so that the aberration contribution rate of each mirror surface in a rear system is improved. For example, a radius of curvature R1 of the object side surface of the first lens and the total effective focal length f of the imaging lens may satisfy 0< R1/f <0.5, and more specifically, R1 and f may further satisfy 0.24 ≦ R1/f ≦ 0.32.
In addition, the relative range of the curvature radius of the object side surface and the image side surface of the first lens can be reasonably controlled, so that the coma aberration of each field of view of the optical system can be effectively controlled, and good imaging quality can be obtained. The radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens can satisfy R1/R2| <0.5, and more specifically, R1 and R2 can further satisfy 0.02 ≦ R1/R2| ≦ 0.26.
In an exemplary embodiment, through reasonable distribution of the powers of the fourth lens and the third lens, the correction of the field-related aberration can be effectively realized, which is beneficial to realizing good imaging quality of the peripheral field of view of the optical system. For example, 0< f4/f3<0.5 may be satisfied between the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens, and more specifically, f4 and f3 may further satisfy 0.01 ≦ f4/f3 ≦ 0.37.
In an exemplary embodiment, by controlling the power of the sixth lens within a reasonable range, curvature of field and distortion of the optical system can be effectively controlled, so that good image quality is obtained at the peripheral field of view of the optical system. For example, the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens may satisfy-2.0 < f/f6<0.5, and more specifically, f and f6 may further satisfy-1.63 ≦ f/f6 ≦ 0.12.
The total effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens can satisfy-2.0 < f/f5 < 1.0, and more specifically, f and f5 can further satisfy-1.61 ≦ f/f5 ≦ 0.75. By controlling the effective focal power of the fifth lens, the astigmatism contribution rate of the fifth lens is in a reasonable range, so that the astigmatism of the system is effectively balanced, and the system obtains good imaging quality.
The total effective focal length f of the imaging lens and the curvature radius R10 of the image side surface of the fifth lens can satisfy-2.0 < f/R10 <0, and more specifically, f and R10 can further satisfy-1.65 ≦ f/R10 ≦ -0.63. The size and the direction of the curvature radius of the image side surface of the fifth lens are reasonably controlled, so that the fifth lens has good spherical aberration balance capability, and good on-axis imaging quality is obtained.
In application, the center thickness of each lens and the spacing distance between each lens can be reasonably arranged. The central thickness CT4 of the fourth lens on the optical axis and the total effective focal length f of the imaging lens can satisfy 0< CT4/f <0.5, more specifically, CT4 and f further satisfy 0.04 ≦ CT4/f ≦ 0.14. By limiting the ratio of the central thickness of the fourth lens to the total effective focal length of the optical system, the curvature of field and distortion of the optical system can be effectively corrected, so that the optical system can obtain good image quality in a full field of view.
In an exemplary embodiment, the center thickness CT6 of the sixth lens on the optical axis and the total effective focal length f of the imaging lens can satisfy f/CT6 ≧ 15, and more specifically, CT6 and f can further satisfy 15.27 ≦ f/CT6 ≦ 30.41. In addition, the central thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens at the maximum radius can satisfy CT6/ET6<1.3, more specifically, CT6 and ET6 can further satisfy 0.34 ≦ CT6/ET6 ≦ 1.21. Through the constraint on the ratio of the center thickness to the edge thickness of the sixth lens, the sixth lens with larger aspheric surface can have better molding characteristics.
The air space T34 on the optical axis of the third lens and the fourth lens and the total effective focal length f of the imaging lens can satisfy 0< T34/f <0.2, and more specifically, T34 and f can further satisfy 0.05 ≦ T34/f ≦ 0.14. By controlling the distance between the third lens and the fourth lens, the combined focal power of the first optical lens group consisting of the first lens, the second lens and the third lens and the combined focal power of the second optical lens group consisting of the fourth lens, the fifth lens and the sixth lens can be effectively adjusted, so that the first optical lens group and the second optical lens group respectively obtain reasonable combined focal powers.
In an exemplary embodiment, the requirement of large image plane and high pixel of the imaging lens is realized by restricting the proportion of the total lens length and the image height. For example, a distance TTL/ImgH ≦ 2.0 between an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens and an ImgH that is half a diagonal length of an effective pixel region on the imaging surface of the imaging lens may be satisfied, and more specifically, the TTL and the ImgH may further satisfy 1.48 ≦ TTL/ImgH ≦ 2.00.
The on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and the total effective focal length f of the imaging lens can satisfy that TTL/f is less than or equal to 1.05, and more specifically, TTL and f further satisfy that TTL/f is less than or equal to 0.92 and less than or equal to 1.05. When the lens parameter meets the condition that TTL/f is less than or equal to 1.05, the total length of the optical system can be effectively controlled, so that the optical system can be suitable for terminal equipment such as a mobile phone and the like with strict requirements on the size of the optical system.
f/EPD ≦ 2.7 may be satisfied between the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens, and more specifically, f and EPD may further satisfy 2.47 ≦ f/EPD ≦ 2.69. The conditional expression f/EPD is less than or equal to 2.7, so that the lens can obtain reasonable diffraction resolution, and further obtain reasonable design and real resolution capability after processing.
Optionally, the imaging lens of the present application may further include a filter for correcting color deviation. The filter may be disposed, for example, between the sixth lens and the imaging surface. It should be understood by those skilled in the art that the filter may be disposed at other positions as desired.
The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. Through rational distribution of focal power and surface type of each lens, central thickness of each lens, on-axis distance between each lens and the like, the characteristic of long focus can be realized while the miniaturization of the lens is ensured, and the resolution and imaging quality of the lens are improved, so that the imaging lens is more favorable for production and processing and is applicable to portable electronic products. In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center 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, so that the imaging quality of the lens is improved.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens can be varied to achieve the various results and advantages described in the present 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 imaging 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 six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens E3 having positive optical power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having positive power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens element E5 having a negative refractive power, and both the object-side surface S9 and the image-side surface S10 being aspheric; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. Optionally, the imaging lens may further include a filter E7 having an object side S13 and an image side S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the object side and the first lens E1 to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 1.
Figure BDA0002446490380000071
TABLE 1
In the embodiment, six lenses are taken as an example, and the focal length of each lens, the surface type of each lens and the spacing distance between each lens are reasonably distributed, so that the miniaturization of the lens is ensured, the resolution of the lens is improved, and the effect of telephoto is realized. Each aspherical surface type x is defined by the following formula:
Figure BDA0002446490380000072
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 the conic coefficient (given in table 1 above); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S12 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Figure BDA0002446490380000073
Figure BDA0002446490380000081
TABLE 2
Table 3 gives the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens of embodiment 1.
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 2.87 -5.46 954.41 7.23 -9.08 -5.84 5.07 26.6
TABLE 3
Fig. 2A shows on-axis chromatic aberration curves of the imaging lens of embodiment 1, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the imaging lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a 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 in the case of 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 imaging lens. As can be seen from fig. 2A to 2D, the imaging lens 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 six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens element E2 having a negative refractive power, the object-side surface S3 being spherical and the image-side surface S4 being aspherical; a third lens element E3 having a positive refractive power, and having an object-side surface S5 aspheric and an image-side surface S6 spherical; a fourth lens element E4 having positive refractive power, and having an object-side surface S7 aspheric and an image-side surface S8 spherical; a fifth lens E5 having positive power, and both of which are aspheric on the object-side surface S9 and the image-side surface S10; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the second lens E2 and the third lens E3 to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 2. Table 5 shows the high-order coefficient of each aspherical mirror surface in example 2. Table 6 shows the effective focal lengths f1 to f6 of the respective lenses of embodiment 2, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000091
TABLE 4
Figure BDA0002446490380000092
TABLE 5
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 3.01 -4.83 25.97 9.37 9.23 -2.90 4.60 34.1
TABLE 6
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 imaging lens. Fig. 4B shows an astigmatism curve representing a meridional field curvature and a 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 in the case of 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 plane after light passes through the imaging 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 six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens element E3 having a negative power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having a negative power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens E5 having positive power, and both of which are aspheric on the object-side surface S9 and the image-side surface S10; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. Optionally, the imaging lens may further include a filter E7 having an object side S13 and an image side S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the first lens E1 and the second lens E2 to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 3. Table 8 shows the high-order coefficient of each aspherical mirror surface in example 3. Table 9 shows the effective focal lengths f1 to f6 of the respective lenses of embodiment 3, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000101
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.2596E-04 -1.0764E-02 2.3720E-02 -3.4946E-02 3.1012E-02 -1.6982E-02 5.4696E-03 -9.2649E-04 5.9226E-05
S2 -5.7804E-03 8.3091E-03 -2.0865E-02 3.5473E-02 -3.6487E-02 2.3053E-02 -8.7845E-03 1.8621E-03 -1.7128E-04
S3 -4.7463E-03 -1.4221E-02 1.1807E-01 -3.1757E-01 5.4741E-01 -6.0551E-01 4.1383E-01 -1.5961E-01 2.6626E-02
S4 2.0735E-02 3.5338E-02 -5.3468E-02 -1.7804E-01 1.6608E+00 -4.7062E+00 6.6797E+00 -4.8100E+00 1.3964E+00
S5 -1.2280E-02 -1.7809E-03 3.7222E-01 -1.6061E+00 3.9965E+00 -6.1480E+00 5.7842E+00 -3.0433E+00 6.8118E-01
S6 -6.3233E-02 1.2316E-01 -1.7384E-01 3.4595E-01 -4.9387E-01 3.2631E-01 1.0231E-01 -2.4497E-01 8.5683E-02
S7 -1.5923E-01 5.7838E-02 2.8709E-01 -8.7229E-01 1.4651E+00 -1.6366E+00 1.0529E+00 -2.9424E-01 4.4968E-03
S8 -1.1188E-01 1.3208E-01 -7.6361E-02 1.1764E-01 -1.9515E-01 1.5243E-01 -5.3394E-02 4.8553E-03 9.0347E-04
S9 -3.6352E-02 -2.1184E-02 6.1650E-02 -4.7187E-02 2.0454E-02 -5.6407E-03 9.7835E-04 -9.7114E-05 4.1981E-06
S10 -7.5094E-04 -6.3111E-02 6.1268E-02 -2.8978E-02 9.2727E-03 -2.1796E-03 3.5139E-04 -3.3361E-05 1.3739E-06
S11 -5.1397E-03 -1.4491E-02 -7.0252E-03 1.2588E-02 -6.0203E-03 1.5212E-03 -2.2076E-04 1.7337E-05 -5.7033E-07
S12 -1.4868E-02 2.8788E-02 -3.6965E-02 2.1226E-02 -7.0568E-03 1.4395E-03 -1.7626E-04 1.1848E-05 -3.3598E-07
TABLE 8
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 3.47 -4.62 -195.12 -30.93 9.99 -8.84 7.48 24.7
TABLE 9
Fig. 6A shows on-axis chromatic aberration curves of the imaging lens of embodiment 3, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the imaging lens. Fig. 6B shows an astigmatism curve representing a meridional field curvature and a 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 in the case of 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 plane after light passes through the imaging lens. As can be seen from fig. 6A to 6D, the imaging lens 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 six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens E3 having positive optical power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having positive power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens element E5 having a negative refractive power, and both the object-side surface S9 and the image-side surface S10 being aspheric; and a sixth lens element E6 having positive power, and having both an object-side surface S11 and an image-side surface S12 being aspheric. Optionally, the imaging lens may further include a filter E7 having an object side S13 and an image side S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the first lens E1 and the second lens E2 to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 4. Table 11 shows the high-order coefficient of each aspherical mirror surface in example 4. Table 12 shows the effective focal lengths f1 to f6 of the respective lenses of embodiment 4, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000121
Watch 10
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.8723E-02 -6.7044E-03 2.2577E-02 -3.0860E-02 2.4964E-02 -1.1181E-02 2.1303E-03 1.3022E-04 -8.5148E-05
S2 -1.1911E-02 3.3335E-02 -5.1946E-02 6.3356E-02 -5.3846E-02 2.7649E-02 -7.2578E-03 4.7080E-04 1.0043E-04
S3 -6.8982E-02 8.4449E-02 9.4814E-02 -5.6120E-01 1.1686E+00 -1.4186E+00 1.0341E+00 -4.1820E-01 7.2101E-02
S4 -7.9768E-02 3.4926E-01 -1.5828E+00 6.9666E+00 -1.9970E+01 3.6029E+01 -3.9489E+01 2.4027E+01 -6.2183E+00
S5 -3.8173E-03 1.1474E-02 2.4663E-01 -8.7857E-01 1.8371E+00 -2.4885E+00 2.0915E+00 -9.8169E-01 1.9622E-01
S6 1.9259E-02 9.3306E-02 -2.3591E-01 6.1611E-01 -1.0894E+00 1.1979E+00 -8.1082E-01 3.1153E-01 -5.2238E-02
S7 -3.2069E-02 -2.5916E-02 7.7155E-02 -7.4381E-02 4.4262E-02 -1.6975E-02 3.9827E-03 -5.1426E-04 2.7865E-05
S8 -2.0003E-03 -3.3974E-02 3.1853E-02 -2.6558E-02 2.0466E-02 -9.1403E-03 2.1877E-03 -2.6539E-04 1.2877E-05
S9 1.2896E-01 -4.9518E-02 -5.2989E-02 5.4964E-02 -1.9470E-02 3.0446E-03 -1.1502E-04 -2.1733E-05 1.9369E-06
S10 3.0400E-02 2.5980E-02 -6.3859E-02 4.4630E-02 -1.7684E-02 4.3624E-03 -6.5140E-04 5.3230E-05 -1.8135E-06
S11 -2.3534E-02 -8.8547E-02 9.5668E-02 -4.9717E-02 1.4207E-02 -2.2511E-03 1.8379E-04 -5.6962E-06 -3.8755E-08
S12 -1.2849E-02 -8.4533E-02 7.7024E-02 -3.6315E-02 1.0380E-02 -1.8468E-03 1.9938E-04 -1.1912E-05 3.0094E-07
TABLE 11
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 3.20 -3.72 153.83 7.32 -4.65 60.77 7.50 24.7
TABLE 12
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 8B shows an astigmatism curve representing a meridional field curvature and a 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 in the case of 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 plane after light passes through the imaging lens. As can be seen from fig. 8A to 8D, the imaging lens 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 six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens E3 having positive optical power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having positive power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens element E5 having a negative refractive power, and both the object-side surface S9 and the image-side surface S10 being aspheric; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. Optionally, the imaging lens may further include a filter E7 having an object side S13 and an image side S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the object side and the first lens E1 to improve the imaging quality. Optionally, the imaging lens may further include a vignetting stop ST1 disposed between the second lens E2 and the third lens E3. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 5. Table 14 shows the high-order coefficient of each aspherical mirror surface in example 5. Table 15 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens of example 5. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000131
Figure BDA0002446490380000141
Watch 13
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 4.1028E-01 -5.6350E-01 1.0135E+00 -1.0689E+00 -3.2971E-01 3.1762E+00 -4.7521E+00 3.2320E+00 -8.6584E-01
S2 -3.6153E-02 2.7066E-01 -1.9148E+00 9.5200E+00 -2.9180E+01 5.5731E+01 -6.4840E+01 4.2096E+01 -1.1728E+01
S3 -5.5216E-02 -1.0718E-01 2.3877E+00 -1.3352E+01 4.4719E+01 -9.5079E+01 1.2488E+02 -9.2736E+01 2.9805E+01
S4 -1.7766E-02 9.5762E-01 -9.9590E+00 8.8567E+01 -4.9501E+02 1.7468E+03 -3.7645E+03 4.5174E+03 -2.3089E+03
S5 -1.5866E-01 -1.2947E-02 3.8271E-01 5.8192E+00 -4.6500E+01 1.6324E+02 -3.1112E+02 3.1058E+02 -1.2688E+02
S6 -1.3259E-01 3.2935E-01 -1.5618E+00 7.4177E+00 -2.1511E+01 3.9349E+01 -4.4515E+01 2.8089E+01 -7.4910E+00
S7 -3.4061E-02 -1.5579E-01 3.9904E-01 -6.4110E-01 6.2964E-01 -3.5840E-01 1.1548E-01 -1.9347E-02 1.2650E-03
S8 3.1771E-01 -9.0559E-01 1.1588E+00 -8.5248E-01 3.6609E-01 -8.7587E-02 9.9714E-03 -1.9369E-04 -3.6477E-05
S9 3.5262E-01 -7.3595E-01 6.7514E-01 -2.5630E-01 -3.5120E-02 7.1664E-02 -2.7753E-02 4.7855E-03 -3.1943E-04
S10 -1.0575E-01 5.1565E-01 -8.0880E-01 6.5761E-01 -3.1953E-01 9.6073E-02 -1.7503E-02 1.7683E-03 -7.5933E-05
S11 2.4819E-03 2.6220E-02 -5.7806E-02 4.2506E-02 -1.8610E-02 5.3255E-03 -9.5436E-04 9.5727E-05 -4.0720E-06
S12 3.0495E-02 -1.9229E-01 1.9233E-01 -1.0055E-01 3.1615E-02 -6.1539E-03 7.2058E-04 -4.6044E-05 1.2169E-06
TABLE 14
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 2.81 -5.19 112.44 6.92 -9.68 -4.94 5.07 32.7
Watch 15
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 imaging lens. Fig. 10B shows an astigmatism curve representing a meridional field curvature and a 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 in the case of 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 plane after light passes through the imaging 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 six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens E3 having positive optical power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having positive power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens E5 having positive power, and both of which are aspheric on the object-side surface S9 and the image-side surface S10; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the second lens E2 and the third lens E3 to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 6. Table 17 shows the high-order coefficient of each aspherical mirror surface in example 6. Table 18 shows the effective focal lengths f1 to f6 of the respective lenses of embodiment 6, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000151
TABLE 16
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 6.2435E-02 -1.3503E-02 1.1755E-01 -3.3913E-01 5.9746E-01 -6.4872E-01 4.2735E-01 -1.5622E-01 2.3871E-02
S2 -2.9075E-02 1.9762E-01 -5.9843E-01 9.5303E-01 -1.7343E-01 -2.1910E+00 3.8380E+00 -2.7397E+00 7.4271E-01
S3 -5.0423E-02 1.4566E-01 3.6093E-01 -4.4543E+00 1.8275E+01 -4.1046E+01 5.2939E+01 -3.6764E+01 1.0682E+01
S4 2.2020E-02 3.3557E-01 -1.3331E+00 1.3577E-02 3.9988E+01 -2.2191E+02 5.7124E+02 -7.3631E+02 3.8444E+02
S5 -5.7897E-02 -5.2816E-01 4.8527E+00 -2.7341E+01 9.8595E+01 -2.2524E+02 3.1768E+02 -2.5231E+02 8.6328E+01
S6 -6.9838E-02 1.0599E-01 -7.5714E-01 3.3675E+00 -8.5307E+00 1.3431E+01 -1.2462E+01 6.1311E+00 -1.1677E+00
S7 2.5238E-02 -1.9625E-01 3.5042E-01 -3.8447E-01 2.6881E-01 -1.0510E-01 1.6568E-02 1.3776E-03 -5.5803E-04
S8 7.6038E-02 -2.6522E-01 2.8852E-01 -1.2231E-01 -2.8471E-02 6.2402E-02 -3.2160E-02 7.6018E-03 -7.0321E-04
S9 4.4389E-02 -1.6889E-01 4.7788E-02 5.0021E-02 -3.6573E-02 3.1896E-03 3.7604E-03 -1.1927E-03 1.0404E-04
S10 3.7775E-02 -1.2752E-02 -7.7224E-02 9.4344E-02 -5.1610E-02 1.5599E-02 -2.6443E-03 2.3287E-04 -8.1648E-06
S11 3.6652E-02 3.3641E-03 -8.0650E-04 -3.4091E-05 5.2483E-07 5.3276E-07 3.4165E-08 3.5466E-09 9.7224E-11
S12 -7.9851E-03 2.6587E-03 -8.4644E-04 1.2708E-04 -5.5743E-06 -4.5512E-07 4.3894E-09 3.3374E-10 -4.1432E-11
TABLE 17
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 3.00 -5.31 27.77 10.21 8.63 -2.82 4.60 34.4
Watch 18
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 imaging 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 in the case of 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 plane after light passes through the imaging lens. As can be seen from fig. 12A to 12D, the imaging lens according to embodiment 6 can achieve good imaging quality.
Example 7
An imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens includes six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive optical power, the object-side surface S1 and the image-side surface S2 being aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens E3 having positive optical power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having positive power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens element E5 having a negative refractive power, and both the object-side surface S9 and the image-side surface S10 being aspheric; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. Optionally, the imaging lens may further include a filter E7 having an object side S13 and an image side S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the object side and the first lens E1 to improve the imaging quality. Optionally, the imaging lens may further include a vignetting stop ST1 disposed between the second lens E2 and the third lens E3. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 7. Table 20 shows the high-order coefficient of each aspherical mirror surface in example 7. Table 21 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens of example 7. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000161
Figure BDA0002446490380000171
Watch 19
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 4.1729E-01 -6.0072E-01 1.2598E+00 -1.9951E+00 1.8297E+00 -7.6431E-03 -1.8445E+00 1.7291E+00 -5.2854E-01
S2 -5.9902E-02 2.7269E-01 -1.2241E+00 4.6967E+00 -1.1055E+01 1.5439E+01 -1.2025E+01 4.3081E+00 -3.3573E-01
S3 -1.2327E-01 3.6564E-01 1.4514E-01 -1.3256E+00 -1.5091E+00 1.8089E+01 -4.4707E+01 4.9102E+01 -2.0910E+01
S4 -6.3501E-02 1.0513E+00 -7.1243E+00 5.5550E+01 -2.8161E+02 9.0313E+02 -1.7730E+03 1.9480E+03 -9.1798E+02
S5 -1.8212E-01 1.1209E-01 1.0767E+00 -6.0259E+00 2.2437E+01 -5.2286E+01 7.2002E+01 -5.3637E+01 1.6693E+01
S6 -1.6491E-01 3.2630E-01 -1.1371E+00 5.3115E+00 -1.5665E+01 2.9740E+01 -3.5340E+01 2.3594E+01 -6.6960E+00
S7 -2.8536E-02 -2.9795E-01 7.7049E-01 -1.2222E+00 1.2517E+00 -7.9618E-01 3.0536E-01 -6.5222E-02 5.9811E-03
S8 2.6581E-01 -1.0126E+00 1.6092E+00 -1.4657E+00 7.8021E-01 -2.3387E-01 3.5044E-02 -1.5781E-03 -9.4154E-05
S9 5.0875E-01 -1.4418E+00 2.1597E+00 -1.9236E+00 1.0235E+00 -3.1535E-01 5.0679E-02 -2.8755E-03 -9.2520E-05
S10 6.9947E-02 -3.3203E-03 -1.4995E-01 1.8680E-01 -1.1864E-01 4.4650E-02 -9.9410E-03 1.2043E-03 -6.1007E-05
S11 -1.2007E-01 5.2665E-01 -8.9675E-01 7.8275E-01 -4.0383E-01 1.2778E-01 -2.4347E-02 2.5658E-03 -1.1500E-04
S12 -1.2881E-01 2.6322E-01 -3.4318E-01 2.4060E-01 -9.9945E-02 2.5624E-02 -4.0092E-03 3.5262E-04 -1.3391E-05
Watch 20
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 2.78 -5.09 158.08 6.44 -7.22 -6.24 5.06 32.7
TABLE 21
Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 14B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the imaging lens of embodiment 7, which represents distortion magnitude values in the case of different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 14A to 14D, the imaging lens according to embodiment 7 can achieve good imaging quality.
Example 8
An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 15, the imaging lens includes six lenses E1-E6 arranged in order from the object side to the imaging side along the optical axis. A first lens E1 having positive power, the object-side surface S1 and the image-side surface S2 being both aspheric; a second lens E2 having a negative power, the object-side surface S3 and the image-side surface S4 being aspheric; a third lens E3 having positive optical power, and both the object-side surface S5 and the image-side surface S6 being aspheric; a fourth lens element E4 having positive power, and both the object-side surface S7 and the image-side surface S8 being aspheric; a fifth lens element E5 having a negative refractive power, and both the object-side surface S9 and the image-side surface S10 being aspheric; and a sixth lens element E6 having a negative power, and having both the object-side surface S11 and the image-side surface S12 being aspherical. Optionally, the imaging lens may further include a filter E7 having an object side S13 and an image side S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may also be provided between, for example, the object side and the first lens E1 to improve the imaging quality. Optionally, the imaging lens may further include a vignetting stop ST1 disposed between the second lens E2 and the third lens E3. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens in example 8. Table 23 shows the high-order coefficient of each aspherical mirror surface in example 8. Table 24 shows the effective focal lengths f1 to f6 of the respective lenses of embodiment 8, the total effective focal length f of the imaging lens, and the maximum half field angle HFOV of the imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0002446490380000181
TABLE 22
Figure BDA0002446490380000182
Figure BDA0002446490380000191
TABLE 23
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f(mm) HFOV(°)
Numerical value 2.79 -5.10 165.07 6.43 -7.32 -6.14 5.06 32.7
Watch 24
Fig. 16A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 8, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 16B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the imaging lens of embodiment 8, which represents distortion magnitude values in the case of different angles of view. Fig. 16D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 8, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 16A to 16D, the imaging lens according to embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 25 below.
Conditional expression (A) example 1 2 3 4 5 6 7 8
TTL/ImgH 1.88 1.55 1.99 2.00 1.49 1.48 1.53 1.53
f/CT6 15.27 30.41 21.37 17.86 15.35 21.90 15.34 15.34
f4/f3 0.01 0.36 0.16 0.05 0.06 0.37 0.04 0.04
CT6/ET6 1.05 0.34 1.06 1.21 0.82 0.49 0.42 0.42
TTL/f 0.96 1.05 0.92 0.93 0.95 1.05 0.95 0.95
CT4/f 0.11 0.10 0.04 0.09 0.14 0.09 0.12 0.12
T34/f 0.13 0.13 0.05 0.14 0.14 0.14 0.13 0.14
R1/f 0.24 0.32 0.25 0.24 0.25 0.32 0.24 0.24
|R1/R2| 0.26 0.13 0.02 0.06 0.22 0.12 0.23 0.23
f/f6 -0.87 -1.59 -0.85 0.12 -1.03 -1.63 -0.81 -0.82
f/EPD 2.64 2.62 2.69 2.63 2.69 2.47 2.69 2.69
f/f5 -0.56 0.50 0.75 -1.61 -0.52 0.53 -0.70 -0.69
f/R10 -1.43 -0.99 -1.20 -0.63 -1.65 -0.96 -1.33 -1.33
TABLE 25
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging apparatus may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.
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 (21)

1. The imaging lens comprises 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 in order from an object side to an image side along an optical axis,
it is characterized in that the preparation method is characterized in that,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface;
the third lens has optical power;
the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface;
the fifth lens has focal power, and the image side surface of the fifth lens is a convex surface;
the sixth lens has an optical power and is,
the total effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens meet the condition that f/f6 is more than or equal to-1.63 and less than or equal to 0.12;
the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens meet the condition that 0< f4/f3 is less than or equal to 0.37;
the total effective focal length f and the central thickness CT6 of the sixth lens on the optical axis meet f/CT6 not less than 15;
the central thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens at the maximum radius meet CT6/ET6< 1.3; and
the number of lenses having a focal power in the imaging lens is six.
2. The imaging lens of claim 1, in which the total effective focal length f and an entrance pupil diameter EPD of the imaging lens satisfy f/EPD ≦ 2.7.
3. The imaging lens of claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis and the total effective focal length f satisfy 0< CT4/f < 0.5.
4. The imaging lens according to claim 1, characterized in that an air interval T34 of the third lens and the fourth lens on the optical axis satisfies 0< T34/f <0.2 with the total effective focal length f.
5. The imaging lens of claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and the total effective focal length f satisfy 0< R1/f < 0.5.
6. The imaging lens of claim 1, wherein a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R2 of an image-side surface of the first lens satisfy | R1/R2| < 0.5.
7. The imaging lens of claim 1, wherein the total effective focal length f and the effective focal length f5 of the fifth lens satisfy-2.0 < f/f5 < 1.0.
8. The imaging lens according to claim 1, wherein the total effective focal length f and a radius of curvature R10 of an image side surface of the fifth lens satisfy-2.0 < f/R10 <0.
9. The imaging lens assembly according to claim 1, wherein TTL and the total effective focal length f satisfy TTL/f ≦ 1.05 for a distance on the optical axis from an object-side surface of the first lens element to an image plane of the imaging lens.
10. The imaging lens system according to any one of claims 1 to 9, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens satisfy TTL/ImgH ≦ 2.0.
11. The imaging lens comprises 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 in order from an object side to an image side along an optical axis,
it is characterized in that the preparation method is characterized in that,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface;
the third lens has optical power;
the fourth lens has focal power, and the image side surface of the fourth lens is a convex surface;
the fifth lens has focal power, and the image side surface of the fifth lens is a convex surface;
the sixth lens has an optical power and is,
the total effective focal length f of the imaging lens and the central thickness CT6 of the sixth lens on the optical axis satisfy f/CT6 is more than or equal to 15,
the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens meet the condition that 0< f4/f3 is less than or equal to 0.37;
the total effective focal length f and the curvature radius R10 of the image side surface of the fifth lens meet the condition that f/R10 is less than 0 and less than 2.0; and
the number of lenses having a focal power in the imaging lens is six.
12. The imaging lens of claim 11, in which the total effective focal length f and an entrance pupil diameter EPD of the imaging lens satisfy f/EPD ≦ 2.7.
13. The imaging lens of claim 11, wherein a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens at a maximum radius satisfy CT6/ET6< 1.3.
14. The imaging lens of claim 11, wherein a center thickness CT4 of the fourth lens on the optical axis and the total effective focal length f satisfy 0< CT4/f < 0.5.
15. The imaging lens of claim 11, wherein an air interval T34 of the third lens and the fourth lens on the optical axis satisfies 0< T34/f <0.2 with the total effective focal length f.
16. The imaging lens of claim 11, wherein a radius of curvature R1 of an object side surface of the first lens and the total effective focal length f satisfy 0< R1/f < 0.5.
17. The imaging lens of claim 11, wherein a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R2 of an image-side surface of the first lens satisfy | R1/R2| < 0.5.
18. The imaging lens of claim 11, wherein the total effective focal length f and the effective focal length f5 of the fifth lens satisfy-2.0 < f/f5 < 1.0.
19. The imaging lens of claim 18, wherein a total effective focal length f of the imaging lens and an effective focal length f6 of the sixth lens satisfy-1.63 ≦ f/f6 ≦ 0.12.
20. The imaging lens system of claim 11, wherein a distance TTL between an object-side surface of the first lens element and an imaging surface of the imaging lens system on the optical axis and the total effective focal length f satisfy TTL/f ≤ 1.05.
21. The imaging lens assembly of claim 11, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens assembly on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens assembly satisfy TTL/ImgH ≦ 2.0.
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