CN107065141B - Imaging lens - Google Patents

Imaging lens Download PDF

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CN107065141B
CN107065141B CN201710353145.3A CN201710353145A CN107065141B CN 107065141 B CN107065141 B CN 107065141B CN 201710353145 A CN201710353145 A CN 201710353145A CN 107065141 B CN107065141 B CN 107065141B
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lens
imaging
imaging lens
image
focal length
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CN107065141A (en
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戴付建
黄林
贾远林
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN202211141335.6A priority Critical patent/CN115373112A/en
Priority to CN201710353145.3A priority patent/CN107065141B/en
Publication of CN107065141A publication Critical patent/CN107065141A/en
Priority to PCT/CN2017/107324 priority patent/WO2018209890A1/en
Priority to US15/780,099 priority patent/US11181718B2/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • 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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

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  • Optics & Photonics (AREA)
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Abstract

The application discloses an imaging lens, which has a total effective focal length f and sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis. Wherein the first lens and the fifth lens both have negative focal power; the second lens, the fourth lens, the sixth lens and the seventh lens all have positive focal power or negative focal power; the third lens has positive focal power, and the effective focal length f3 and the total effective focal length f meet the requirement that f3/f is more than 1 and less than 1.5.

Description

Imaging lens
Technical Field
The present invention relates to an imaging lens, and more particularly, to an imaging lens including seven lenses.
Background
In recent years, with the development of science and technology, portable electronic products have been gradually developed, and portable electronic products having an image capturing function are more favored. Imaging lenses mounted on moving devices such as vehicle-mounted imaging lenses, surveillance imaging lenses, and unmanned aerial vehicles are also being developed in the direction of high-pixel and wide-angle. In addition, higher requirements are also put on the stability of the performance of the lens under different temperature conditions.
Because the glass lens has small coefficient of performance expansion and is less influenced by temperature, the lens of the full glass lens can be adopted to keep the stability of the performance of the lens under different temperature conditions. However, the all-glass lens is high in cost and difficult to miniaturize; meanwhile, due to the use of the spherical lens, the resolving power of the lens is poor, and the cost performance is low.
Therefore, there is a need for a wide-angle and miniaturized imaging lens that can have high imaging quality over a wide temperature variation range.
Disclosure of Invention
The technical solution provided by the present application at least partially solves the technical problems described above.
According to an aspect of the present application, there is provided an imaging lens having a total effective focal length f and including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Wherein the first lens and the fifth lens both have negative focal power; the second lens, the fourth lens, the sixth lens and the seventh lens all have positive focal power or negative focal power; the third lens has positive focal power, and the effective focal length f3 and the total effective focal length f meet the requirement that f3/f is more than 1 and less than 1.5.
In one embodiment, the third lens is a glass lens.
This application has adopted the multi-disc (for example, seven) lenses, through the focal power of each lens of rational distribution imaging lens to and the material of each lens of rational selection (as above, the third lens can be the lens of glass material), at the in-process that reduces the temperature and to imaging lens performance influence, make imaging lens have wide angle, miniaturized and high definition power's advantage.
Another aspect of the present application provides an optical lens having a total effective focal length f and including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens and the fifth lens each have a negative power; the second lens, the fourth lens, the sixth lens and the seventh lens all have positive focal power or negative focal power; the third lens has positive focal power; and the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens can satisfy the condition that R3/R4 is more than 0.6 and less than or equal to 1.4.
There is also provided according to another aspect of the present application an optical lens having a maximum half field angle HFOV and including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens and the fifth lens each have a negative power; the second lens, the fourth lens, the sixth lens and the seventh lens all have positive focal power or negative focal power; the third lens has positive focal power; and the maximum half field angle HFOV may satisfy 1.7 < tan (HFOV) < 2.5.
In one embodiment, the image-side surface of the second lens element may be convex, and the object-side surface of the seventh lens element may be convex.
In one embodiment, the fourth lens and the fifth lens are cemented to form a cemented lens.
In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the imaging lens along the optical axis and the total effective focal length f may satisfy 4.2 < TTL/f < 5.5.
In one embodiment, the fourth lens has positive power, and the effective focal length f4 and the total effective focal length f can satisfy 1 < f4/f < 1.7.
In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens can satisfy-1.15 < f5/f < 0.
In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the effective focal length f1 of the first lens can satisfy-0.6 < R2/f1 < -0.2.
With the imaging lens configured as described above, it is also possible to further have at least one of advantageous effects of maintaining performance stability at different temperatures, effectively correcting aberrations, shortening the total length of the optical system, reducing tolerance sensitivity of the lens, and the like.
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 axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens of embodiment 1, respectively;
fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 2;
fig. 5 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 structural view 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 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 axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of an imaging lens of embodiment 7, respectively.
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.
The paraxial region refers to a region near the optical axis. Herein, a surface closest to the object in each lens is referred to as an object side surface, and a surface closest to the imaging surface in each lens is referred to as an image side surface.
It will be further understood that the terms "comprises," "comprising," "includes," "including" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, 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, in the present application, the embodiments and features of the embodiments 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 following provides a detailed description of the features, principles, and other aspects of the present application.
An imaging lens according to an exemplary embodiment of the present application has, for example, seven lenses, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are 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 negative power; the second lens can have positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens may have a positive optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a negative optical power; the sixth lens may have a positive power or a negative power; and the seventh lens element may have positive or negative power, and the object-side surface thereof may be convex.
The third lens may be a glass lens. Compared with a lens made of plastic, the lens made of glass has a smaller thermal expansion coefficient and is less affected by temperature. The third lens is made of glass, so that the influence of temperature change on imaging quality can be reduced, and the performance stability of the lens at different temperatures can be improved. The mixed use of the glass lens and the plastic lens is to correct the influence of temperature change on the imaging quality of the lens, and thus the effective focal length f3 of the third glass lens mainly based on the correction temperature is required to be equivalent to the total effective focal length f of the imaging lens. For example, 1 < f3/f < 1.5 may be satisfied between the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens, and more specifically, f3 and f may further satisfy 1.27 ≦ f3/f ≦ 1.49.
The fourth lens and the fifth lens may be cemented together to constitute a cemented lens. As known to those skilled in the art, cemented lenses are used to minimize or eliminate chromatic aberration. The use of the cemented lens can improve the image quality and reduce the reflection loss of light energy, thereby improving the definition of the image. By introducing the cemented lens consisting of the fourth lens and the fifth lens, the chromatic aberration of the system can be corrected, the tolerance sensitivity of the system is reduced, and the imaging quality of the imaging lens is improved. In addition, the use of the cemented lens composed of the fourth lens and the fifth lens can also simplify the assembly procedure in the lens manufacturing process, facilitating the mass production of the lens.
In application, the power of each lens can be optimized. For example, an effective focal length f5 of the fifth lens and a total effective focal length f of the imaging lens may satisfy-1.15 < f5/f < 0, and more specifically, f5 and f may further satisfy-1.07 ≦ f5/f ≦ -0.75.
In some embodiments, the fourth lens may have a positive optical power. An effective focal length f4 of the fourth lens and a total effective focal length f of the imaging lens can satisfy 1 < f4/f < 1.7, and more specifically, f4 and f further can satisfy 1.17 ≦ f4/f ≦ 1.60. When f4 and f satisfy 1 < f4/f < 1.7, the fourth lens can provide a relatively small positive focal length under the condition of ensuring that the fourth lens satisfies the processing performance condition, thereby being beneficial to the correction of chromatic aberration.
The distance between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis TTL and the total effective focal length f of the imaging lens can satisfy 4.2 < TTL/f < 5.5, and more specifically, the distance between TTL and f can further satisfy 4.45 < TTL/f < 4.57. The optical lens can be miniaturized, the field angle can be enlarged, various aberrations can be effectively corrected, and the imaging quality is improved.
The maximum half field angle HFOV of the imaging lens can satisfy 1.7 < tan (HFOV) < 2.5, and more specifically, the HFOV can further satisfy 1.85 < tan (HFOV) < 2.12. When the maximum half field angle HFOV of the imaging lens meets 1.7 < tan (HFOV) < 2.5, the lens can have the field angle as large as possible on the premise of ensuring the imaging quality of the lens.
In addition, the radii of curvature of the object-side and image-side surfaces of the second lens can be optimized. For example, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens may satisfy 0.6 < R3/R4 ≦ 1.4, and more specifically, R3 and R4 may further satisfy 0.62 ≦ R3/R4 ≦ 1.40. When the curvature radius R3 of the object side surface of the second lens is similar to the curvature radius R4 of the image side surface of the second lens, the imaging lens can have a longer focal length; at the same time, such a configuration is advantageous for correcting aberrations.
In order to reduce tolerance sensitivity of the first lens and facilitate assembly of the lens, the curvature radius R2 of the image side surface of the first lens and the effective focal length f1 of the first lens need to be reasonably configured. For example, the radius of curvature R2 of the image-side surface of the first lens element and the effective focal length f1 of the first lens element can satisfy-0.6 < R2/f1 < -0.2, and more specifically, R2 and f1 can further satisfy-0.52 ≦ R2/f1 ≦ -0.39.
As known to those skilled in the art, the aspheric lens has better curvature radius characteristics, and thus has the advantages of improving distortion aberration and improving astigmatic aberration, which can improve the imaging quality. In use, for example, at least one of the object-side and image-side surfaces of the second, sixth and/or seventh lenses may be arranged as an aspheric surface to further improve the imaging quality of the lens.
In the embodiment of the present application, a stop STO may be further provided, for example, between the second lens and the third lens to effectively contract light entering the imaging lens, thereby improving the imaging quality of the lens. It should be understood by those skilled in the art that the stop STO may be disposed at other positions as needed, i.e., the disposition of the stop STO should not be limited to the position shown in the drawings.
The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. 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 field angle of the imaging lens can be effectively enlarged, the influence of temperature on an optical system is reduced, the miniaturization of the lens is ensured, the relative illumination of the lens is improved, and the imaging quality of the lens is improved. The imaging lens can be applied to portable electronic products, and can also be suitable for being carried on sports equipment such as vehicle-mounted camera lenses, monitoring camera lenses, unmanned aerial vehicles and the like.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the imaging lens is not limited to include seven lenses. The imaging lens may also include other numbers of lenses, if desired.
Specific examples of 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 seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality. The light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging plane S16.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface All-round Go to nothing
S1 Spherical surface 9.6634 0.6500 1.732/54.68
S2 Spherical surface 2.5362 2.2183
S3 Aspherical surface -5.7394 1.5313 1.645/23.53 -0.6469
S4 Aspherical surface -5.0485 -0.2161 0.3292
STO Spherical surface Go to nothing 0.7541
S5 Spherical surface 25.5967 1.9298 1.807/56.57
S6 Spherical surface -4.4288 0.1614
S7 Spherical surface 6.1884 1.7046 1.591/64.14
S8 Spherical surface -4.8831 0.5000 1.853/23.78
S9 Spherical surface 4.5632 1.1260
S10 Spherical surface 9.8374 1.7011 1.546/56.11
S11 Aspherical surface All-round 0.6163 -98.9818
S12 Aspherical surface 2.6752 1.1014 1.546/56.11 -4.5044
S13 Aspherical surface 3.9892 0.5702 -4.0426
S14 Spherical surface All-round 0.8000 1.517/64.17
S15 Spherical surface Go to nothing 0.8601
S16 Spherical surface Go to nothing
TABLE 1
As can be seen from table 1, R3/R4=1.14 is satisfied between the radius of curvature R3 of the object-side surface S3 of the second lens L2 and the radius of curvature R4 of the image-side surface S4 of the second lens L2.
The embodiment adopts seven lenses as an example, and by reasonably distributing the focal length and the surface type of each lens, the field angle of the lens is effectively enlarged, the total length of the lens is shortened, and the influence of temperature change on the imaging quality is corrected; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Wherein each aspheric surface type x is defined by the following formula:
Figure BDA0001298381360000081
wherein x is the distance rise from the vertex of the aspheric surface 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 =1/R (i.e., paraxial curvature c is the reciprocal of the 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 S3, S4, S11, S12 and S13 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 -7.2185E-03 1.2809E-04 3.2896E-06 -2.4476E-07 5.3992E-09 -5.2934E-11 1.9592E-13
S4 7.0105E-04 -3.3937E-04 1.2965E-03 -1.1875E-03 6.2973E-04 -1.7163E-04 1.8836E-05
S11 -2.1039E-02 5.1825E-03 -9.2174E-04 1.1284E-04 -8.6741E-06 3.7296E-07 -6.8288E-09
S12 -1.8843E-03 -6.8724E-04 7.1636E-05 -2.6597E-06 4.7938E-08 -4.2361E-10 1.4682E-12
S13 -1.1709E-03 -1.2110E-03 1.5168E-04 -9.3184E-06 3.3024E-07 -6.1337E-09 4.5550E-11
TABLE 2
Table 3 shown below gives the effective focal lengths f1 to f7 of the respective lenses of embodiment 1, the total effective focal length f of the imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens.
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm)
Numerical value -4.89 34.82 4.82 4.90 -2.70 18.02 11.48
Parameter(s) f(mm) ImgH(mm) HFOV(°) TTL(mm)
Numerical value 3.50 4.08 64.75 16.01
TABLE 3
According to table 3, f3/f =1.37 is satisfied between the effective focal length f3 of the third lens L3 and the total effective focal length f of the imaging lens; f4/f =1.40 is satisfied between the effective focal length f4 of the fourth lens L4 and the total effective focal length f of the imaging lens; f5/f = -0.77 is satisfied between the effective focal length f5 of the fifth lens L5 and the total effective focal length f of the imaging lens; the distance TTL between the object side surface S1 of the first lens L1 and the imaging surface S16 of the imaging lens on the optical axis and the total effective focal length f of the imaging lens satisfy TTL/f =4.57; the maximum half field angle HFOV of the imaging lens satisfies tan (HFOV) =2.12. As can be seen from tables 1 and 3, R2/f1= -0.52 is satisfied between the radius of curvature R2 of the image-side surface S2 of the first lens L1 and the effective focal length f1 of the first lens L1.
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 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 surface 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 seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S15 in order and is finally imaged on the imaging plane S16.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of 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 f7 of the respective lenses, the total effective focal length f of the imaging lens, half ImgH of the diagonal length of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens of example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001298381360000101
Figure BDA0001298381360000111
TABLE 4
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 4.8540E-03 1.6463E-03 -1.1453E-03 7.2924E-04 -1.8882E-04 7.3343E-06 3.8579E-06
S4 -8.1765E-05 -3.9458E-03 6.2793E-03 -5.6195E-03 2.7510E-03 -6.9738E-04 7.1459E-05
S10 8.2159E-03 -1.9622E-03 2.3361E-04 4.2219E-06 -4.7012E-06 5.0415E-07 -1.6583E-08
S11 4.3118E-03 -2.9069E-03 9.5921E-04 -1.7117E-04 1.8493E-05 -1.1614E-06 3.3243E-08
S12 -8.7381E-03 -2.1927E-03 5.6086E-04 -7.0974E-05 4.6112E-06 -1.4372E-07 9.9722E-10
S13 -7.1778E-03 -1.8328E-03 3.8218E-04 -3.9732E-05 2.1778E-06 -5.8846E-08 4.7272E-10
TABLE 5
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm)
Numerical value -4.76 -30.58 5.25 4.15 -3.76 11.64 29.22
Parameter(s) f(mm) ImgH(mm) HFOV(°) TTL(mm)
Numerical value 3.53 3.93 62.13 16.00
TABLE 6
Fig. 4A shows on-axis chromatic aberration curves of the imaging lens of embodiment 2, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the imaging lens. Fig. 4B shows an astigmatism curve 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 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. 3, the imaging lens includes seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, an aperture STO for limiting a light beam may be further provided to improve imaging quality. The light from the object passes through the respective surfaces S1 to S15 in order and is finally imaged on the imaging plane S16.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of 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 f7 of the respective lenses, the total effective focal length f of the imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens of embodiment 3. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001298381360000121
Figure BDA0001298381360000131
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 -5.0561E-04 9.7638E-04 1.5370E-05 8.8931E-05 -5.6889E-05 9.2825E-06 5.5438E-08
S4 -3.6858E-03 -6.6265E-03 1.8358E-02 -1.8972E-02 1.0668E-02 -3.1006E-03 3.6459E-04
S10 -7.5309E-04 -8.0633E-04 4.2678E-04 -1.0040E-04 1.6905E-05 -1.5260E-06 5.5919E-08
S11 -7.5478E-03 1.6779E-03 3.4018E-05 -7.1729E-05 1.5885E-05 -1.4080E-06 4.9413E-08
S12 -2.0693E-02 2.5172E-03 -2.0894E-04 1.0596E-05 -4.0189E-07 1.5042E-08 -4.7628E-10
S13 -1.6790E-02 8.1195E-04 7.2357E-05 -1.9613E-05 1.6479E-06 -6.4074E-08 8.6098E-10
TABLE 8
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm)
Numerical value -4.62 82.92 4.64 5.52 -3.30 8.54 70.07
Parameter(s) f(mm) ImgH(mm) HFOV(°) TTL(mm)
Numerical value 3.58 3.93 63.39 16.00
TABLE 9
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 imaging lens. Fig. 6B shows an astigmatism curve 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 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 seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to constitute a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality. The light from the object passes through the respective surfaces S1 to S15 in order and is finally imaged on the imaging plane S16.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of 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 f7 of the respective lenses, the total effective focal length f of the imaging lens, half ImgH of the diagonal length of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens of example 4. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface All-round All-round
S1 Spherical surface 8.4266 0.7376 1.732/54.68
S2 Spherical surface 2.2981 1.8945
S3 Aspherical surface -9.3481 2.3881 1.645/23.53 15.3033
S4 Aspherical surface -6.6957 -0.1000 2.3447
STO Spherical surface All-round 0.4876
S5 Spherical surface 15.7512 1.4086 1.807/56.57
S6 Spherical surface -4.7947 0.0500
S7 Spherical surface 6.4264 1.7215 1.591/64.14
S8 Spherical surface -4.1083 0.3000 1.853/23.78
S9 Spherical surface 5.2039 1.0448
S10 Aspherical surface -25.1730 1.3091 1.546/56.11 0.0000
S11 Aspherical surface -18.9561 0.6257 0.0000
S12 Aspherical surface 3.1714 1.8871 1.546/56.11 -7.1752
S13 Aspherical surface 8.4351 0.6408 -2.3974
S14 Spherical surface Go to nothing 0.3000 1.517/64.17
S15 Spherical surface All-round 1.3047
S16 Spherical surface All-round
Watch 10
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 -3.7359E-03 2.2151E-04 -7.1690E-05 5.3657E-06 -1.7279E-07 2.5998E-09 -1.5041E-11
S4 1.0883E-03 -1.9210E-03 3.3736E-03 -2.8032E-03 1.2696E-03 -2.9341E-04 2.7126E-05
S10 -9.9658E-03 -2.4312E-04 6.1825E-04 -3.0871E-04 6.9944E-05 -6.8443E-06 2.3970E-07
S11 -3.6737E-02 8.9341E-03 -1.9358E-03 3.1641E-04 -3.7066E-05 2.9148E-06 -1.0500E-07
S12 -6.8837E-03 6.3204E-04 -9.1429E-06 -5.0866E-07 1.8551E-08 -2.1768E-10 8.7413E-13
S13 -5.3574E-03 -5.8906E-04 1.6337E-04 -1.8267E-05 1.2421E-06 -4.5893E-08 6.8089E-10
TABLE 11
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm)
Numerical value -4.55 27.06 4.70 4.52 -2.65 130.86 8.26
Parameter(s) f(mm) ImgH(mm) HFOV(°) TTL(mm)
Numerical value 3.51 3.93 61.67 16.00
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 seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, an aperture STO for limiting a light beam may be further provided to improve imaging quality. The light from the object passes through the respective surfaces S1 to S15 in order and is finally imaged on the imaging plane S16.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of 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 f7 of the respective lenses, the total effective focal length f of the imaging lens, half ImgH of the diagonal length of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 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.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface All-round All-round
S1 Spherical surface 7.3301 0.7000 1.732/54.68
S2 Spherical surface 2.2000 1.7220
S3 Aspherical surface -5.1829 2.0952 1.645/23.53 4.7612
S4 Aspherical surface -5.1020 0.0500 -1.0810
STO Spherical surface All-round 0.4614
S5 Spherical surface 11.4212 1.6834 1.807/56.57
S6 Spherical surface -5.0613 0.0500
S7 Spherical surface 7.5904 1.7069 1.591/64.14
S8 Spherical surface -3.7216 0.6000 1.853/23.78
S9 Spherical surface 6.1133 0.9677
S10 Aspherical surface -10.4315 0.8871 1.546/56.11 0.0000
S11 Aspherical surface -4.0042 0.4397 0.0000
S12 Aspherical surface 14.1299 1.9387 1.546/56.11 11.2434
S13 Aspherical surface -300.0000 1.0099 -1.2218E+21
S14 Spherical surface All-round 0.8000 1.517/64.17
S15 Spherical surface All-round 0.8879
S16 Spherical surface All-round
Watch 13
Figure BDA0001298381360000161
Figure BDA0001298381360000171
TABLE 14
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm)
Numerical value -4.56 45.48 4.55 4.48 -2.64 11.35 24.77
Parameter(s) f(mm) ImgH(mm) HFOV(°) TTL(mm)
Numerical value 3.54 3.93 62.14 16.00
Watch 15
Fig. 10A shows on-axis chromatic aberration curves of the imaging lens of embodiment 5, which represent deviation of convergence focuses 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 seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, an aperture STO for limiting a light beam may be further provided to improve imaging quality. The light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging plane S16.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of 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 f7 of the respective lenses, the total effective focal length f of the imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens of embodiment 6. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface Go to nothing All-round
S1 Spherical surface 8.3266 0.7000 1.546/56.11
S2 Spherical surface 2.0758 1.8788
S3 Aspherical surface -3.5060 1.0134 1.645/23.53 1.6737
S4 Aspherical surface -3.9391 0.0500 -0.1677
STO Spherical surface Go to nothing 0.0500
S5 Spherical surface 9.4945 2.3870 1.807/56.57
S6 Spherical surface -6.6890 0.8526
S7 Spherical surface 22.5256 1.7345 1.591/64.14
S8 Spherical surface -3.2636 0.6000 1.853/23.78
S9 Spherical surface 33.2668 0.1387
S10 Aspherical surface -36.3604 1.7408 1.546/56.11 0.0000
S11 Aspherical surface -4.3233 0.0500 0.0000
S12 Aspherical surface 3.7887 1.9780 1.546/56.11 0.0000
S13 Aspherical surface 4.2481 1.0386 0.0000
S14 Spherical surface Go to nothing 0.8000 1.517/64.17
S15 Spherical surface Go to nothing 0.9876
S16 Spherical surface Go to nothing
TABLE 16
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 3.0495E-03 2.6078E-04 4.6653E-04 -3.5445E-04 2.0235E-04 -6.4637E-05 8.9457E-06
S4 -6.5201E-04 -3.2508E-03 4.9834E-03 -4.3441E-03 2.0560E-03 -5.0503E-04 5.0359E-05
S10 9.2204E-03 -2.5050E-03 5.6156E-04 -6.9412E-05 4.8289E-06 -1.4415E-07 7.8836E-10
S11 -2.7043E-03 1.1147E-03 -1.0369E-04 3.3831E-06 2.5011E-06 -3.8923E-07 1.8548E-08
S12 -1.5367E-02 1.7325E-03 -4.3983E-04 8.3974E-05 -9.6587E-06 5.8582E-07 -1.5030E-08
S13 -9.8408E-03 -5.9885E-04 1.6100E-04 -1.5981E-05 8.1788E-07 -2.3542E-08 2.4306E-10
TABLE 17
Figure BDA0001298381360000181
Figure BDA0001298381360000191
Watch 18
Fig. 12A shows on-axis chromatic aberration curves of the imaging lens of embodiment 6, which represent deviation of convergence focuses 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 seven lenses L1 to L7 arranged in order from the object side to the imaging side along the optical axis. A first lens L1 having an object-side surface S1 and an image-side surface S2; a second lens L2 having an object-side surface S3 and an image-side surface S4; a third lens L3 having an object-side surface S5 and an image-side surface S6; a fourth lens L4 having an object-side surface S7 and an image-side surface S8; a fifth lens L5 having an object-side surface S8 and an image-side surface S9; a sixth lens L6 having an object-side surface S10 and an image-side surface S11; and a seventh lens L7 having an object-side surface S12 and an image-side surface S13. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens. Optionally, the imaging lens may further include a filter L8 having an object side surface S14 and an image side surface S15. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality. The light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging plane S16.
Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of 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 f7 of the respective lenses, the total effective focal length f of the imaging lens, half of the diagonal length ImgH of the effective pixel region on the imaging surface S16, the maximum half field angle HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens of embodiment 7. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface All-round Go to nothing
S1 Spherical surface 5.1238 0.7000 1.732/54.68
S2 Spherical surface 2.1242 1.7838
S3 Aspherical surface -5.2278 2.1014 1.645/23.53 3.7233
S4 Aspherical surface -8.4611 0.0500 -4.4272
STO Spherical surface All-round 0.0500
S5 Spherical surface 11.4207 1.2465 1.807/56.57
S6 Spherical surface -5.1980 1.2980
S7 Spherical surface -57.0466 1.6563 1.546/56.11
S8 Spherical surface -3.0000 0.6000 1.645/23.53
S9 Spherical surface 11.7189 0.1828
S10 Aspherical surface 25.7496 1.5897 1.546/56.11 0.0000
S11 Aspherical surface -4.8224 0.0500 0.0000
S12 Aspherical surface 4.0602 1.2784 1.546/56.11 0.0000
S13 Aspherical surface 4.5933 1.2664 0.0000
S14 Spherical surface Go to nothing 0.8000 1.517/64.17
S15 Spherical surface Go to nothing 1.3467
S16 Spherical surface All-round
Watch 19
Flour mark A4 A6 A8 A10 A12 A14 A16
S3 -1.4633E-03 3.6635E-03 -4.8602E-03 3.6316E-03 -1.4806E-03 3.1021E-04 -2.6059E-05
S4 -1.7348E-04 -1.8831E-03 3.3958E-03 -3.0964E-03 1.5379E-03 -3.8979E-04 3.9399E-05
S10 6.0460E-03 -1.7363E-03 4.3265E-04 -9.1468E-05 1.1913E-05 -7.9849E-07 2.1898E-08
S11 3.2575E-03 -3.6518E-04 2.8585E-04 -7.7251E-05 9.5967E-06 -5.5950E-07 1.3569E-08
S12 -1.1480E-02 5.1254E-04 6.6478E-05 -2.5333E-05 2.8635E-06 -1.4633E-07 2.7260E-09
S13 -1.3595E-02 6.0390E-04 5.7792E-05 -1.8978E-05 1.8753E-06 -8.6990E-08 1.5361E-09
Watch 20
Parameter(s) f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm)
Numerical value -5.50 -28.48 4.58 5.74 -3.65 7.58 34.70
Parameter(s) f(mm) ImgH(mm) HFOV(°) TTL(mm)
Numerical value 3.60 3.93 63.91 16.00
TABLE 21
Fig. 14A shows on-axis chromatic aberration curves of the imaging lens of embodiment 7, which represent deviation of convergence focuses 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.
In conclusion, examples 1 to 7 each satisfy the relationship shown in table 22 below.
Conditional expression (A) example 1 2 3 4 5 6 7
f5/f -0.77 -1.07 -0.92 -0.76 -0.75 -0.97 -1.01
f3/f 1.37 1.49 1.30 1.34 1.29 1.46 1.27
TTL/f 4.57 4.53 4.47 4.56 4.53 4.48 4.45
tan(HFOV) 2.12 1.89 2.00 1.85 1.89 1.91 2.04
R3/R4 1.14 0.75 1.04 1.40 1.02 0.89 0.62
f4/f 1.40 1.17 1.54 1.29 1.27 1.38 1.60
R2/f1 -0.52 -0.46 -0.48 -0.51 -0.48 -0.39 -0.39
TABLE 22
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 (9)

1. An imaging lens assembly 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, a sixth lens element and a seventh lens element,
the first lens and the fifth lens each have a negative optical power;
the second lens has positive focal power or negative focal power;
the fourth lens, the sixth lens and the seventh lens each have positive optical power;
the third lens has positive optical power;
the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet the condition that R3/R4 is more than 0.6 and less than or equal to 1.4;
the maximum half field angle HFOV of the imaging lens meets 1.7 < tan (HFOV) < 2.5; and
the number of lenses having optical power of the imaging lens is seven.
2. The imaging lens assembly of claim 1, wherein the image-side surface of the second lens element is convex and the object-side surface of the seventh lens element is convex.
3. The imaging lens according to claim 1, wherein an effective focal length f3 of the third lens and a total effective focal length f of the imaging lens satisfy 1 < f3/f < 1.5.
4. The imaging lens of claim 2, wherein an effective focal length f5 of the fifth lens and a total effective focal length f of the imaging lens satisfy-1.15 < f5/f < 0.
5. The imaging lens according to claim 2, wherein a radius of curvature R2 of an image side surface of the first lens and an effective focal length f1 of the first lens satisfy-0.6 < R2/f1 < -0.2.
6. The imaging lens of claim 2, wherein a distance TTL between an object side surface of the first lens element and an image plane of the imaging lens on the optical axis and a total effective focal length f of the imaging lens satisfy 4.2 < TTL/f < 5.5.
7. The imaging lens of claim 2, wherein the third lens is a glass lens.
8. The imaging lens according to claim 2, characterized in that the fourth lens and the fifth lens are cemented to constitute a cemented lens.
9. The imaging lens according to claim 2, wherein the fourth lens has a positive power, and an effective focal length f4 thereof and a total effective focal length f of the imaging lens satisfy 1 < f4/f < 1.7.
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