CN107577033B - Imaging lens - Google Patents

Imaging lens Download PDF

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CN107577033B
CN107577033B CN201711001644.2A CN201711001644A CN107577033B CN 107577033 B CN107577033 B CN 107577033B CN 201711001644 A CN201711001644 A CN 201711001644A CN 107577033 B CN107577033 B CN 107577033B
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lens
imaging
focal length
effective focal
imaging lens
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CN107577033A (en
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闻人建科
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to PCT/CN2018/095980 priority patent/WO2019080556A1/en
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Abstract

The application discloses imaging lens includes following preface from object side to image side along optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has positive focal power, and both the object side surface and the image side surface of the first lens are convex surfaces; the second lens has negative focal power, and the object side surface and the image side surface of the second lens are both concave surfaces; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface; the fifth lens has positive focal power or negative focal power, wherein the maximum half field angle HFOV of the imaging lens satisfies HFOV ≦ 25 °.

Description

Imaging lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an imaging lens including five lenses.
Background
In recent years, with the rapid update of portable electronic products such as mobile phones and tablet computers, the requirements of the market for product-side imaging lenses are increasingly diversified. At present, in addition to the miniaturization of the imaging lens to be suitable for portable electronic products, the imaging lens is required to have high pixel, high resolution, and long focal length, so as to meet the imaging requirements of various fields.
Disclosure of Invention
The present application provides an imaging lens, such as a compact telephoto lens, applicable to portable electronic products, which can solve at least or partially at least one of the above-mentioned disadvantages of the related art.
In one aspect, the present application provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens can have negative focal power, and both the object side surface and the image side surface of the second lens can be concave; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, and the image side surface of the fourth lens can be concave; the fifth lens has positive focal power or negative focal power, wherein the maximum half field angle HFOV of the imaging lens can satisfy HFOV ≦ 25 °.
In one embodiment, the effective focal length f1 of the first lens and the separation distance T23 of the second lens and the third lens on the optical axis can satisfy 3.0 < f1/T23 < 5.0.
In one embodiment, the distance TTL between the center of 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 of the imaging lens can satisfy TTL/f ≦ 1.0.
In one embodiment, the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy 1.5 < f1/CT1 < 3.0.
In one embodiment, the total effective focal length f of the imaging lens and the separation distance T45 between the fourth lens and the fifth lens on the optical axis can satisfy 4.0 < f/T45 < 6.0.
In one embodiment, the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens may satisfy 0 < f/f3 < 1.
In one embodiment, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy 1.5 < (f3-f4)/(f3+ f4) < 8.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy-0.3 ≦ (f1+ f2)/(f1-f2) < 0.
In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens can satisfy 0 < (R2-R3)/(R2+ R3) ≦ 0.20.
In one embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the total effective focal length f of the imaging lens may satisfy 3.0mm < f1 × f3/f < 5.5 mm.
In one embodiment, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the imaging lens may satisfy 2.5mm < f2 × f4/f < 3.5 mm.
In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens can have negative focal power, and both the object side surface and the image side surface of the second lens can be concave; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, and the image side surface of the fourth lens can be concave; the fifth lens has positive focal power or negative focal power, wherein the distance TTL from the center of the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and the total effective focal length f of the imaging lens can meet the condition that TTL/f is less than or equal to 1.0.
In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens can have negative focal power, and both the object side surface and the image side surface of the second lens can be concave; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, and the image side surface of the fourth lens can be concave; the fifth lens has positive power or negative power, wherein the total effective focal length f of the imaging lens and the separation distance T45 between the fourth lens and the fifth lens on the optical axis can satisfy 4.0 < f/T45 < 6.0.
In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens can have negative focal power, and both the object side surface and the image side surface of the second lens can be concave; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, and the image side surface of the fourth lens can be concave; the fifth lens has positive power or negative power, wherein the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens can satisfy 1.5 < (f3-f4)/(f3+ f4) < 8.
In another aspect, the present application further provides an imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and both the object side surface and the image side surface of the first lens can be convex surfaces; the second lens can have negative focal power, and both the object side surface and the image side surface of the second lens can be concave; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, and the image side surface of the fourth lens can be concave; the fifth lens has positive power or negative power, wherein the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens and the total effective focal length f of the imaging lens can satisfy 2.5mm < f2 f4/f < 3.5 mm.
The imaging lens adopts a plurality of lenses (for example, five lenses), and has at least one beneficial effect of ultra-thinness, miniaturization, long focus, low sensitivity, good processability, high imaging quality and the like by reasonably distributing the focal power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments 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 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 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 magnification chromatic aberration curve, respectively, of an imaging lens of embodiment 8;
fig. 17 is a schematic structural view showing an imaging lens according to embodiment 9 of the present application;
fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens of embodiment 9.
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.
The imaging lens according to an exemplary embodiment of the present application may include, for example, five lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in sequence 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 and the image-side surface thereof may be convex; the second lens can have negative focal power, and the object side surface of the second lens can be a concave surface, and the image side surface of the second lens can be a concave surface; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, and the image side surface of the fourth lens can be concave; the fifth lens has positive power or negative power.
In an exemplary embodiment, the object-side surface of the fifth lens element may be concave, and the image-side surface may be convex.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 3.0 < f1/T23 < 5.0, where f1 is an effective focal length of the first lens, and T23 is a separation distance on an optical axis between the second lens and the third lens. More specifically, f1 and T23 can further satisfy 3.35. ltoreq. f 1/T23. ltoreq.4.43. Satisfying the conditional expression 3.0 < f1/T23 < 5.0, the light condensing characteristic of the first lens can be ensured, and the spherical aberration of the central field of view can be effectively reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy a conditional expression TTL/f ≦ 1.0, where TTL is a distance on an optical axis from a center of an object-side surface of the first lens element to an imaging surface of the imaging lens, and f is a total effective focal length of the imaging lens. More specifically, TTL and f can further satisfy 0.87 ≦ TTL/f ≦ 0.90. The condition formula TTL/f is less than or equal to 1.0, so that the miniaturization characteristic of the lens is ensured while the long-focus characteristic is met.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1.5 < f1/CT1 < 3.0, where f1 is an effective focal length of the first lens, and CT1 is a central thickness of the first lens on an optical axis. More specifically, f1 and CT1 can further satisfy 1.91. ltoreq. f1/CT 1. ltoreq.2.55. The method meets the conditional expression that f1/CT1 is more than 1.5 and less than 3.0, can effectively ensure the processing characteristics of the first lens, and meets the requirement of miniaturization of the imaging lens.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 4.0 < f/T45 < 6.0, where f is a total effective focal length of the imaging lens, and T45 is a separation distance of the fourth lens and the fifth lens on an optical axis. More specifically, f and T45 further satisfy 4.31. ltoreq. f/T45. ltoreq.5.79. The distance between the fourth lens and the fifth lens is reasonably arranged, so that the distortion of the marginal field of view can be effectively ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < f/f3 < 1, where f is the total effective focal length of the imaging lens, and f3 is the effective focal length of the third lens. More specifically, f and f3 further can satisfy 0.50. ltoreq. f/f 3. ltoreq.0.90, for example, 0.60. ltoreq. f/f 3. ltoreq.0.82. And the focal power of the third lens is reasonably distributed, so that the sensitivity of the imaging lens is favorably reduced, and the processability of the lens is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1.5 < (f3-f4)/(f3+ f4) < 8, where f3 is an effective focal length of the third lens and f4 is an effective focal length of the fourth lens. More specifically, f3 and f4 further satisfy 1.99 ≦ (f3-f4)/(f3+ f4) ≦ 7.65. By reasonably distributing the focal power of the third lens and the fourth lens, the on-axis chromatic aberration of the imaging lens can be balanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression-0.3 ≦ (f1+ f2)/(f1-f2) < 0, where f1 is an effective focal length of the first lens and f2 is an effective focal length of the second lens. More specifically, f1 and f2 further satisfy-0.29 ≦ (f1+ f2)/(f1-f2) ≦ -0.08. By reasonably distributing the focal power of the first lens and the second lens, the aberration of the marginal field of view is favorably reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < (R2-R3)/(R2+ R3) ≦ 0.20, where R2 is a radius of curvature of an image-side surface of the first lens and R3 is a radius of curvature of an object-side surface of the second lens. More specifically, R2 and R3 may further satisfy 0.05 ≦ (R2-R3)/(R2+ R3) ≦ 0.20. The curvature radiuses of the image side surface of the first lens and the object side surface of the second lens are reasonably distributed, and high-grade spherical aberration and high-grade astigmatism of the imaging lens are balanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 3.0mm < f1 f3/f < 5.5mm, where f1 is an effective focal length of the first lens, f3 is an effective focal length of the third lens, and f is a total effective focal length of the imaging lens. More specifically, f1, f3, and f can further satisfy 3.32mm ≦ f1 × f3/f ≦ 5.34 mm. By reasonably distributing f1, f3 and f, the field angle of the imaging lens is favorably reduced, and the imaging lens can better meet the requirement of telephoto.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 2.5mm < f2 f4/f < 3.5mm, where f2 is an effective focal length of the second lens, f4 is an effective focal length of the fourth lens, and f is a total effective focal length of the imaging lens. More specifically, f2, f4, and f can further satisfy 2.62mm ≦ f2 × f4/f ≦ 3.28 mm. By reasonably distributing f2, f4 and f, primary aberration and high-order aberration of the imaging lens are balanced, and the telephoto characteristic of the lens is realized while the miniaturization of the lens is ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression HFOV ≦ 25 °, where HFOV is the maximum half field angle of the imaging lens. More specifically, the HFOV further can satisfy 16.0 ≦ HFOV ≦ 16.6. The HFOV is less than or equal to 25 degrees, which is beneficial to realizing the long focus characteristic of the lens.
In an exemplary embodiment, the imaging lens may further include at least one stop to improve the imaging quality of the lens. For example, the stop may be disposed between the second lens and the third lens, and for example, the stop may also be disposed between the object side and the first lens.
Optionally, the imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five 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 volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the imaging lens is more beneficial to production and processing and can be suitable for portable electronic products. Meanwhile, the imaging lens with the configuration has the beneficial effects of ultrathin, long-focus, high imaging quality and the like.
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 of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
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 five lenses are exemplified in the embodiment, the imaging lens is not limited to including five 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, an imaging lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the second lens E2 and the third lens E3 to improve the imaging quality of the lens.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1, where the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001443502350000091
Figure BDA0001443502350000101
TABLE 1
As can be seen from table 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. In the present embodiment, the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric formula:
Figure BDA0001443502350000102
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); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S10 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 5.6390E-03 -7.2600E-03 1.9167E-02 -2.4190E-02 1.8396E-02 -8.3200E-03 2.1040E-03 -2.5000E-04 4.8800E-06
S2 -4.3220E-02 1.0205E-01 -1.2552E-01 1.1807E-01 -8.5150E-02 4.2530E-02 -1.3350E-02 2.3250E-03 -1.7000E-04
S3 -1.1041E-01 2.8836E-01 -4.2568E-01 4.7040E-01 -4.0245E-01 2.4944E-01 -1.0098E-01 2.3398E-02 -2.3300E-03
S4 -1.3590E-02 2.1409E-01 -5.6802E-01 1.1330E+00 -1.6333E+00 1.5547E+00 -9.0983E-01 2.9590E-01 -4.1000E-02
S5 -1.8040E-02 -8.6370E-02 2.2982E-01 -1.3021E+00 3.1009E+00 -4.3760E+00 3.7329E+00 -1.7523E+00 3.4310E-01
S6 -1.0190E-02 -4.0450E-02 1.7128E-02 -7.0956E-01 1.9806E+00 -2.8336E+00 2.4295E+00 -1.1760E+00 2.4505E-01
S7 -4.3870E-02 1.0163E-02 -4.8495E-01 1.7566E+00 -4.0462E+00 6.0498E+00 -5.4681E+00 2.7049E+00 -5.6453E-01
S8 -2.3120E-02 1.2133E-02 -1.2298E-01 3.7725E-01 -6.7935E-01 8.3168E-01 -6.4025E-01 2.7167E-01 -4.8200E-02
S9 -5.3840E-02 3.4079E-02 -3.4030E-02 3.0829E-02 -1.9290E-02 7.6970E-03 -1.8000E-03 2.2200E-04 -1.1000E-05
S10 -7.3400E-02 2.8454E-02 -1.8990E-02 1.0514E-02 -4.1900E-03 1.1820E-03 -2.5000E-04 3.8100E-05 -2.9000E-06
TABLE 2
In embodiment 1, the total effective focal length f of the imaging lens is 7.31 mm; the effective focal length f1 of the first lens E1 is 3.21 mm; the effective focal length f2 of the second lens E2 is-4.80 mm; the effective focal length f3 of the third lens E3 is 8.94 mm; the effective focal length f4 of the fourth lens E4 is-3.99 mm; the effective focal length f5 of the fifth lens E5 is 68561.24 mm. The total optical length of the imaging lens (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens E1 to the imaging surface S13) TTL is 6.39 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.0 °.
The imaging lens in embodiment 1 satisfies:
f1/T23 is 3.54, wherein f1 is the effective focal length of the first lens E1, and T23 is the distance between the second lens E2 and the third lens E3 on the optical axis;
the TTL/f is 0.87, where TTL is the total optical length of the imaging lens, and f is the total effective focal length of the imaging lens;
f1/CT1 is 2.55, where f1 is the effective focal length of the first lens E1, and CT1 is the central thickness of the first lens E1 on the optical axis;
f/T45 is 5.79, where f is the total effective focal length of the imaging lens, and T45 is the distance between the fourth lens element E4 and the fifth lens element E5 on the optical axis;
f/f3 is 0.82, where f is the total effective focal length of the imaging lens, and f3 is the effective focal length of the third lens E3;
(f3-f4)/(f3+ f4) ═ 2.61, where f3 is the effective focal length of the third lens E3 and f4 is the effective focal length of the fourth lens E4;
(f1+ f2)/(f1-f2) — 0.20, where f1 is the effective focal length of the first lens E1 and f2 is the effective focal length of the second lens E2;
(R2-R3)/(R2+ R3) ═ 0.05, where R2 is the radius of curvature of the image side S2 of the first lens E1 and R3 is the radius of curvature of the object side S3 of the second lens E2;
f1 × f3/f is 3.93mm, where f1 is the effective focal length of the first lens E1, f3 is the effective focal length of the third lens E3, and f is the total effective focal length of the imaging lens;
f2 × f4/f is 2.62mm, where f2 is the effective focal length of the second lens E2, f4 is the effective focal length of the fourth lens E4, and f is the total effective focal length of the imaging lens.
In addition, fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the 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 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, an imaging lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the second lens E2 and the third lens E3 to improve the imaging quality of the lens.
Table 3 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001443502350000121
Figure BDA0001443502350000131
TABLE 3
As is clear from table 3, in example 2, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 3.6220E-03 1.3007E-02 -2.1420E-02 2.4524E-02 -1.5890E-02 5.6520E-03 -8.8000E-04 3.9617E-06 5.6200E-06
S2 1.1703E-02 5.7752E-02 -1.0738E-01 2.0698E-02 1.0215E-01 -1.1597E-01 5.6443E-02 -1.3417E-02 1.2740E-03
S3 6.1420E-03 5.5697E-02 -6.4210E-02 -1.1146E-01 3.1124E-01 -2.9871E-01 1.4647E-01 -3.6878E-02 3.8000E-03
S4 1.3852E-01 -3.5074E-01 1.3582E+00 -3.6324E+00 6.1801E+00 -6.5944E+00 4.2957E+00 -1.5636E+00 2.4409E-01
S5 -6.3680E-02 3.2919E-02 -2.1809E-01 2.8740E-01 -2.4158E-01 1.0644E-01 -1.7150E-02 0.0000E+00 0.0000E+00
S6 -4.1780E-02 -2.6620E-02 -5.2100E-02 6.2561E-02 -2.7426E-02 -3.2600E-03 5.5120E-03 0.0000E+00 0.0000E+00
S7 -2.6200E-02 3.7653E-02 4.1712E-02 -5.3830E-02 2.1067E-02 -3.5300E-03 2.1700E-04 0.0000E+00 0.0000E+00
S8 6.3994E-02 -1.7550E-02 1.0275E-01 -9.9940E-02 4.3486E-02 -9.8100E-03 8.9300E-04 0.0000E+00 0.0000E+00
S9 -1.8666E-01 8.1860E-02 -4.3280E-02 1.4386E-02 -2.0349E-03 7.3100E-05 3.8900E-06 0.0000E+00 0.0000E+00
S10 -1.8607E-01 9.7703E-02 -6.3550E-02 3.1214E-02 -1.0118E-02 1.7920E-03 -1.3000E-04 0.0000E+00 0.0000E+00
TABLE 4
In embodiment 2, the total effective focal length f of the imaging lens is 7.15 mm; the effective focal length f1 of the first lens E1 is 2.44 mm; the effective focal length f2 of the second lens E2 is-2.85 mm; the effective focal length f3 of the third lens E3 is 9.72 mm; the effective focal length f4 of the fourth lens E4 is-7.47 mm; the effective focal length f5 of the fifth lens E5 is-12.36 mm. The total optical length TTL of the imaging lens is 6.40 mm. The ImgH of half of the diagonal length of the effective pixel area on the imaging plane S13 is 2.16 mm. The maximum half field angle HFOV of the imaging lens is 16.1 °.
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows 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 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 according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the second lens E2 and the third lens E3 to improve the imaging quality of the lens.
Table 5 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 3, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 5
As is clear from table 5, in example 3, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 5.4400E-03 -4.5200E-03 1.1667E-02 -1.2060E-02 6.2690E-03 -6.5000E-04 -8.9000E-04 4.1700E-04 -5.9685E-05
S2 -8.0780E-02 2.1485E-01 -3.2263E-01 3.5881E-01 -2.8845E-01 1.5595E-01 -5.2640E-02 9.8970E-03 -7.8524E-04
S3 -1.1351E-01 3.2532E-01 -5.2622E-01 6.1631E-01 -5.2088E-01 2.9910E-01 -1.0776E-01 2.1609E-02 -1.8108E-03
S4 -9.5400E-03 1.6470E-01 -4.1406E-01 7.1880E-01 -8.6800E-01 6.8413E-01 -3.2693E-01 8.4523E-02 -8.8731E-03
S5 -3.9980E-02 3.1766E-02 -3.8326E-01 1.1310E+00 -2.6309E+00 3.9222E+00 -3.4681E+00 1.6669E+00 -3.3517E-01
S6 -7.1110E-02 2.5925E-01 -1.1130E+00 2.9917E+00 -6.0966E+00 8.3280E+00 -6.9721E+00 3.2219E+00 -6.2826E-01
S7 -1.2804E-01 3.4078E-01 -1.1720E+00 3.1525E+00 -6.5670E+00 9.2670E+00 -8.1316E+00 3.9851E+00 -8.3201E-01
S8 -8.7690E-02 2.8258E-01 -6.8806E-01 1.4265E+00 -2.3533E+00 2.7343E+00 -2.0237E+00 8.4538E-01 -1.5091E-01
S9 -5.9420E-02 1.3095E-02 2.4672E-02 -4.0090E-02 3.1884E-02 -1.4760E-02 3.9480E-03 -5.6000E-04 3.2412E-05
S10 -7.5520E-02 1.5869E-02 2.8080E-03 -3.5700E-03 -7.9000E-04 1.9060E-03 -8.7000E-04 1.6900E-04 -1.2177E-05
TABLE 6
In embodiment 3, the total effective focal length f of the imaging lens is 7.31 mm; the effective focal length f1 of the first lens E1 is 3.21 mm; the effective focal length f2 of the second lens E2 is-5.89 mm; the effective focal length f3 of the third lens E3 is 11.72 mm; the effective focal length f4 of the fourth lens E4 is-3.89 mm; the effective focal length f5 of the fifth lens E5 is 67120.11 mm. The total optical length TTL of the imaging lens is 6.39 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.1 °.
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows 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 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 according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the object side and the first lens E1 to improve the imaging quality of the lens.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 4, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001443502350000161
TABLE 7
As is clear from table 7, in example 4, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 3.7810E-03 8.2030E-03 -2.1540E-02 3.7564E-02 -3.8260E-02 2.3820E-02 -8.9100E-03 1.8470E-03 -1.7000E-04
S2 1.7550E-03 1.6839E-02 5.7087E-02 -1.6513E-01 1.9271E-01 -1.2587E-01 4.7821E-02 -9.8800E-03 8.5800E-04
S3 -5.3560E-02 9.4706E-02 3.4460E-02 -3.2054E-01 5.0684E-01 -4.1848E-01 1.9877E-01 -5.1440E-02 5.6400E-03
S4 1.1061E-02 3.8790E-03 1.9308E-01 -6.6504E-01 1.0865E+00 -1.0359E+00 5.9310E-01 -1.9029E-01 2.6397E-02
S5 -9.9720E-02 1.3217E-01 -4.6091E-01 1.2806E+00 -3.1063E+00 4.9062E+00 -4.6678E+00 2.4392E+00 -5.4085E-01
S6 -3.5958E-01 1.3920E+00 -4.1925E+00 9.7736E+00 -1.7424E+01 2.1779E+01 -1.7568E+01 8.1317E+00 -1.6330E+00
S7 -3.2313E-01 1.1847E+00 -3.2717E+00 7.1368E+00 -1.2604E+01 1.6341E+01 -1.4007E+01 6.9420E+00 -1.4939E+00
S8 -1.6667E-01 4.7929E-01 -9.1699E-01 1.2597E+00 -1.1422E+00 6.1308E-01 -1.4512E-01 -1.2420E-02 9.4170E-03
S9 -7.5530E-02 1.4830E-02 8.0720E-03 -9.1600E-03 3.3686E-03 -1.5000E-04 -2.0000E-04 4.6800E-05 -3.3000E-06
S10 -7.7990E-02 1.2194E-02 1.1224E-02 -1.5440E-02 9.3195E-03 -3.3700E-03 7.3300E-04 -8.7000E-05 4.2600E-06
TABLE 8
In embodiment 4, the total effective focal length f of the imaging lens is 7.24 mm; the effective focal length f1 of the first lens E1 is 2.86 mm; the effective focal length f2 of the second lens E2 is-4.25 mm; the effective focal length f3 of the third lens E3 is 11.87 mm; the effective focal length f4 of the fourth lens E4 is-4.50 mm; the effective focal length f5 of the fifth lens E5 is-316.30 mm. The total optical length TTL of the imaging lens is 6.40 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.1 °.
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 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 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 according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the object side and the first lens E1 to improve the imaging quality of the lens.
Table 9 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 5, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 9
As is clear from table 9, in example 5, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 6.5800E-03 -8.6300E-03 2.0416E-02 -2.2200E-02 1.3495E-02 -3.6600E-03 -2.0000E-04 3.4613E-04 -5.6761E-05
S2 -4.2170E-02 8.2233E-02 -7.8624E-02 8.9707E-02 -1.1128E-01 9.1843E-02 -4.3210E-02 1.0582E-02 -1.0486E-03
S3 -6.0740E-02 1.0453E-01 -5.6293E-02 -1.5800E-03 -6.3600E-03 3.3124E-02 -2.6970E-02 8.9004E-03 -1.0768E-03
S4 1.2450E-02 7.4364E-02 -2.5424E-01 6.5454E-01 -1.1227E+00 1.1891E+00 -7.4585E-01 2.5465E-01 -3.6547E-02
S5 -6.2130E-02 1.0110E-03 -1.1769E-01 2.7641E-01 -9.4559E-01 1.8066E+00 -1.8298E+00 9.6642E-01 -2.1496E-01
S6 -1.8077E-01 5.6106E-01 -1.6934E+00 3.9771E+00 -7.4135E+00 9.6446E+00 -7.8889E+00 3.6152E+00 -7.0759E-01
S7 -1.7110E-01 4.5653E-01 -8.7121E-01 1.3028E+00 -1.8780E+00 2.3175E+00 -1.9599E+00 9.4202E-01 -1.9349E-01
S8 -1.3917E-01 4.2607E-01 -8.2220E-01 1.3803E+00 -1.9518E+00 2.0716E+00 -1.4572E+00 5.8787E-01 -1.0194E-01
S9 -7.6380E-02 2.4831E-02 -1.2224E-02 1.4395E-02 -1.3180E-02 7.0810E-03 -2.0800E-03 3.0918E-04 -1.8332E-05
S10 -8.5760E-02 1.9738E-02 -2.9700E-03 -2.0400E-03 1.8850E-03 -8.4000E-04 2.1800E-04 -2.7842E-05 1.3392E-06
Watch 10
In embodiment 5, the total effective focal length f of the imaging lens is 7.32 mm; the effective focal length f1 of the first lens E1 is 3.21 mm; the effective focal length f2 of the second lens E2 is-5.65 mm; the effective focal length f3 of the third lens E3 is 12.17 mm; the effective focal length f4 of the fourth lens E4 is-4.10 mm; the effective focal length f5 of the fifth lens E5 is 70049.70 mm. The total optical length TTL of the imaging lens is 6.40 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.1 °.
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows 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 surface after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens according to embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the object side and the first lens E1 to improve the imaging quality of the lens.
Table 11 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 6, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001443502350000201
TABLE 11
As is clear from table 11, in example 6, both the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric. Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 5.4400E-03 -4.5219E-03 1.1667E-02 -1.2060E-02 6.2690E-03 -6.5000E-04 -8.9000E-04 4.1700E-04 -5.9685E-05
S2 -8.0780E-02 2.1485E-01 -3.2263E-01 3.5881E-01 -2.8845E-01 1.5595E-01 -5.2640E-02 9.8970E-03 -7.8524E-04
S3 -1.1351E-01 3.2532E-01 -5.2622E-01 6.1631E-01 -5.2088E-01 2.9910E-01 -1.0776E-01 2.1609E-02 -1.8108E-03
S4 -9.5400E-03 1.6470E-01 -4.1406E-01 7.1880E-01 -8.6800E-01 6.8413E-01 -3.2693E-01 8.4523E-02 -8.8731E-03
S5 -3.9980E-02 3.1766E-02 -3.8326E-01 1.1310E+00 -2.6309E+00 3.9222E+00 -3.4681E+00 1.6669E+00 -3.3517E-01
S6 -7.1110E-02 2.5925E-01 -1.1130E+00 2.9917E+00 -6.0966E+00 8.3280E+00 -6.9721E+00 3.2219E+00 -6.2826E-01
S7 -1.2804E-01 3.4078E-01 -1.1720E+00 3.1525E+00 -6.5670E+00 9.2670E+00 -8.1316E+00 3.9851E+00 -8.3201E-01
S8 -8.7690E-02 2.8258E-01 -6.8806E-01 1.4265E+00 -2.3533E+00 2.7343E+00 -2.0237E+00 8.4538E-01 -1.5091E-01
S9 -5.9420E-02 1.3095E-02 2.4672E-02 -4.0090E-02 3.1884E-02 -1.4760E-02 3.9480E-03 -5.6000E-04 3.2412E-05
S10 -7.5520E-02 1.5869E-02 2.8080E-03 -3.5700E-03 -7.9016E-04 1.9060E-03 -8.7000E-04 1.6900E-04 -1.2177E-05
TABLE 12
In embodiment 6, the total effective focal length f of the imaging lens is 7.31 mm; the effective focal length f1 of the first lens E1 is 3.21 mm; the effective focal length f2 of the second lens E2 is-5.89 mm; the effective focal length f3 of the third lens E3 is 11.72 mm; the effective focal length f4 of the fourth lens E4 is-3.89 mm; the effective focal length f5 of the fifth lens E5 is 67120.11 mm. The total optical length TTL of the imaging lens is 6.39 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.1 °.
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values 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 surface after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens according to embodiment 6 can achieve good imaging quality.
Example 7
An imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the object side and the first lens E1 to improve the imaging quality of the lens.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 7, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Watch 13
As is clear from table 13, in example 7, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 5.6390E-03 -7.2600E-03 1.9167E-02 -2.4190E-02 1.8396E-02 -8.3200E-03 2.1040E-03 -2.5000E-04 4.8800E-06
S2 -4.3220E-02 1.0205E-01 -1.2552E-01 1.1807E-01 -8.5154E-02 4.2530E-02 -1.3350E-02 2.3250E-03 -1.7000E-04
S3 -1.1041E-01 2.8836E-01 -4.2568E-01 4.7040E-01 -4.0245E-01 2.4944E-01 -1.0098E-01 2.3398E-02 -2.3300E-03
S4 -1.3590E-02 2.1409E-01 -5.6802E-01 1.1330E+00 -1.6333E+00 1.5547E+00 -9.0983E-01 2.9590E-01 -4.1000E-02
S5 -1.8040E-02 -8.6370E-02 2.2982E-01 -1.3021E+00 3.1009E+00 -4.3760E+00 3.7329E+00 -1.7523E+00 3.4310E-01
S6 -1.0190E-02 -4.0450E-02 1.7128E-02 -7.0956E-01 1.9806E+00 -2.8336E+00 2.4295E+00 -1.1760E+00 2.4505E-01
S7 -4.3870E-02 1.0163E-02 -4.8495E-01 1.7566E+00 -4.0462E+00 6.0498E+00 -5.4681E+00 2.7049E+00 -5.6453E-01
S8 -2.3120E-02 1.2133E-02 -1.2298E-01 3.7725E-01 -6.7935E-01 8.3168E-01 -6.4025E-01 2.7167E-01 -4.8200E-02
S9 -5.3840E-02 3.4079E-02 -3.4031E-02 3.0829E-02 -1.9290E-02 7.6970E-03 -1.8000E-03 2.2200E-04 -1.1000E-05
S10 -7.3400E-02 2.8454E-02 -1.8990E-02 1.0514E-02 -4.1857E-03 1.1820E-03 -2.5000E-04 3.8100E-05 -2.9000E-06
TABLE 14
In embodiment 7, the total effective focal length f of the imaging lens is 7.31 mm; the effective focal length f1 of the first lens E1 is 3.21 mm; the effective focal length f2 of the second lens E2 is-4.80 mm; the effective focal length f3 of the third lens E3 is 8.94 mm; the effective focal length f4 of the fourth lens E4 is-3.99 mm; the effective focal length f5 of the fifth lens E5 is 68561.24 mm. The total optical length TTL of the imaging lens is 6.39 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.0 °.
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 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 surface after light passes through the 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 8 of the present application.
As shown in fig. 15, the imaging lens according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the second lens E2 and the third lens E3 to improve the imaging quality of the lens.
Table 15 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 8, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001443502350000241
Watch 15
As is clear from table 15, in example 8, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 16 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.7660E-03 5.1192E-03 -9.3241E-03 1.4478E-02 -1.4300E-02 8.9430E-03 -3.4000E-03 7.1500E-04 -6.4000E-05
S2 -5.3950E-02 1.5218E-01 -2.2997E-01 2.4446E-01 -1.7982E-01 8.6529E-02 -2.5580E-02 4.1740E-03 -2.9000E-04
S3 -1.3293E-01 4.0534E-01 -7.2350E-01 9.1052E-01 -7.9857E-01 4.6673E-01 -1.7033E-01 3.4755E-02 -3.0000E-03
S4 -1.3050E-02 2.1671E-01 -4.7848E-01 6.1579E-01 -4.1511E-01 6.2650E-03 2.0597E-01 -1.3386E-01 2.7842E-02
S5 -1.8940E-02 -1.0422E-01 4.6469E-01 -2.6667E+00 7.1725E+00 -1.1500E+01 1.1077E+01 -5.8646E+00 1.3083E+00
S6 3.3110E-03 -5.2655E-02 2.8464E-02 -7.9447E-01 2.0166E+00 -2.5217E+00 1.8458E+00 -7.5522E-01 1.3297E-01
S7 -7.0140E-02 1.2012E-01 -7.7015E-01 2.2210E+00 -4.6292E+00 6.5185E+00 -5.5944E+00 2.6342E+00 -5.2576E-01
S8 -6.1750E-02 1.0772E-01 -2.8122E-01 4.8048E-01 -5.8509E-01 5.6814E-01 -3.9046E-01 1.5463E-01 -2.5860E-02
S9 -1.1138E-01 6.2945E-02 -2.9423E-02 8.3880E-03 1.1840E-03 -1.5300E-03 4.2700E-04 -5.3000E-05 2.5300E-06
S10 -1.3646E-01 8.6412E-02 -6.7139E-02 4.4095E-02 -2.1630E-02 7.6180E-03 -1.7600E-03 2.3500E-04 -1.4000E-05
TABLE 16
In embodiment 8, the total effective focal length f of the imaging lens is 7.27 mm; the effective focal length f1 of the first lens E1 is 3.21 mm; the effective focal length f2 of the second lens E2 is-4.60 mm; the effective focal length f3 of the third lens E3 is 9.54 mm; the effective focal length f4 of the fourth lens E4 is-4.60 mm; the effective focal length f5 of the fifth lens E5 is 123451.56 mm. The total optical length TTL of the imaging lens is 6.39 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.1 °.
Fig. 16A shows an on-axis chromatic aberration curve of an imaging lens of embodiment 8, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the 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 surface after light passes through the lens. As can be seen from fig. 16A to 16D, the imaging lens according to embodiment 8 can achieve good imaging quality.
Example 9
An imaging lens according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an imaging lens according to embodiment 9 of the present application.
As shown in fig. 17, an imaging lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and an image plane S13.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10.
Optionally, the imaging lens may further include a filter E6 having an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Optionally, the imaging lens may further include a stop STO disposed between the object side and the first lens E1 to improve the imaging quality of the lens.
Table 17 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 9, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001443502350000261
TABLE 17
As is clear from table 17, in example 9, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 18 shows high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0001443502350000262
Figure BDA0001443502350000271
Watch 18
In embodiment 9, the total effective focal length f of the imaging lens is 7.08 mm; the effective focal length f1 of the first lens E1 is 2.86 mm; the effective focal length f2 of the second lens E2 is-4.29 mm; the effective focal length f3 of the third lens E3 is 11.90 mm; the effective focal length f4 of the fourth lens E4 is-5.42 mm; the effective focal length f5 of the fifth lens E5 is-18.97 mm. The total optical length TTL of the imaging lens is 6.40 mm. The ImgH, which is half the diagonal length of the effective pixel area on the imaging plane S13, is 2.15 mm. The maximum half field angle HFOV of the imaging lens is 16.6 °.
Fig. 18A shows an on-axis chromatic aberration curve of an imaging lens of embodiment 9, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 9. Fig. 18C shows a distortion curve of the imaging lens of embodiment 9, which represents distortion magnitude values in the case of different angles of view. Fig. 18D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 9, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 18A to 18D, the imaging lens according to embodiment 9 can achieve good imaging quality.
In summary, examples 1 to 9 each satisfy the relationship shown in table 19.
Conditional expression (A) example 1 2 3 4 5 6 7 8 9
HFOV(°) 16.0 16.1 16.1 16.1 16.1 16.1 16.0 16.1 16.6
f1/T23 3.54 4.37 3.35 4.36 4.07 3.35 3.54 3.47 4.43
TTL/f 0.87 0.89 0.87 0.88 0.87 0.87 0.87 0.88 0.90
f1/CT1 2.55 1.91 2.54 2.02 2.36 2.54 2.55 2.50 2.00
f/T45 5.79 4.31 5.48 4.74 5.46 5.48 5.79 5.76 5.08
f/f3 0.82 0.74 0.62 0.61 0.60 0.62 0.82 0.76 0.60
(f3-f4)/(f3+f4) 2.61 7.65 1.99 2.22 2.02 1.99 2.61 2.86 2.67
(f1+f2)/(f1-f2) -0.20 -0.08 -0.29 -0.20 -0.28 -0.29 -0.20 -0.18 -0.20
(R2-R3)/(R2+R3) 0.05 0.08 0.09 0.12 0.20 0.09 0.05 0.05 0.11
f1*f3/f(mm) 3.93 3.32 5.15 4.69 5.34 5.15 3.93 4.21 4.81
f2*f4/f(mm) 2.62 2.97 3.14 2.64 3.16 3.14 2.62 2.91 3.28
Watch 19
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 device 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 (18)

1. An imaging lens in which five lenses having refractive power are provided, the lenses being a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, the first lens to the fifth lens being arranged in order from an object side surface to an image side surface along an optical axis,
the first lens has positive focal power, and both the object side surface and the image side surface of the first lens are convex surfaces;
the second lens has negative focal power, and both the object side surface and the image side surface of the second lens are concave;
the third lens has positive focal power, and the image side surface of the third lens is a convex surface;
the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface;
the fifth lens has positive focal power or negative focal power, the image side surface of the fifth lens is a convex surface,
wherein the maximum half field angle HFOV of the imaging lens meets the condition that the HFOV is less than or equal to 25 degrees,
an effective focal length f1 of the first lens is separated from the second lens and the third lens on the optical axis by a distance T23 satisfying 3.0 < f1/T23 < 5.0; and
the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy 1.5 < (f3-f4)/(f3+ f4) < 8.
2. The imaging lens of claim 1, wherein a distance TTL between a center of an object-side surface of the first lens element and an imaging surface of the imaging lens on the optical axis and a total effective focal length f of the imaging lens satisfy TTL/f ≤ 1.0.
3. The imaging lens of claim 1, wherein an effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy 1.5 < f1/CT1 < 3.0.
4. The imaging lens of claim 1, wherein a total effective focal length f of the imaging lens and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy 4.0 < f/T45 < 6.0.
5. The imaging lens of claim 1, wherein the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy 0 < f/f3 < 1.
6. The imaging lens according to any one of claims 1 to 5, characterized in that an effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy-0.3 ≦ (f1+ f2)/(f1-f2) < 0.
7. The imaging lens according to any one of claims 1 to 5, wherein a radius of curvature R2 of an image-side surface of the first lens and a radius of curvature R3 of an object-side surface of the second lens satisfy 0 < (R2-R3)/(R2+ R3) ≦ 0.20.
8. The imaging lens according to any one of claims 1 to 5, characterized in that an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and a total effective focal length f of the imaging lens satisfy 3.0mm < f1 f3/f < 5.5 mm.
9. The imaging lens according to any one of claims 1 to 5, characterized in that an effective focal length f2 of the second lens, an effective focal length f4 of the fourth lens, and a total effective focal length f of the imaging lens satisfy 2.5mm < f2 x f4/f < 3.5 mm.
10. An imaging lens in which five lenses having refractive power are provided, the lenses being a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, the first lens to the fifth lens being arranged in order from an object side surface to an image side surface along an optical axis,
the first lens has positive focal power, and both the object side surface and the image side surface of the first lens are convex surfaces;
the second lens has negative focal power, and both the object side surface and the image side surface of the second lens are concave;
the third lens has positive focal power, and the image side surface of the third lens is a convex surface;
the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface;
the fifth lens has positive focal power or negative focal power, the image side surface of the fifth lens is a convex surface,
the distance TTL between the center of 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 of the imaging lens meet the condition that TTL/f is less than or equal to 1.0,
an effective focal length f1 of the first lens is separated from the second lens and the third lens on the optical axis by a distance T23 satisfying 3.0 < f1/T23 < 5.0; and
the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy 1.5 < (f3-f4)/(f3+ f4) < 8.
11. The imaging lens of claim 10, wherein an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and a total effective focal length f of the imaging lens satisfy 3.0mm < f1 f3/f < 5.5 mm.
12. The imaging lens of claim 10, wherein an effective focal length f2 of the second lens, an effective focal length f4 of the fourth lens, and a total effective focal length f of the imaging lens satisfy 2.5mm < f2 f4/f < 3.5 mm.
13. The imaging lens of claim 10, wherein an effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy-0.3 ≦ (f1+ f2)/(f1-f2) < 0.
14. The imaging lens of claim 10, wherein the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens satisfy 0 < f/f3 < 1.
15. The imaging lens according to claim 14, wherein a maximum half field angle HFOV of the imaging lens satisfies HFOV ≦ 25 °.
16. The imaging lens according to any one of claims 10 to 14, wherein an effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy 1.5 < f1/CT1 < 3.0.
17. The imaging lens according to any one of claims 10 to 14, characterized in that a total effective focal length f of the imaging lens and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy 4.0 < f/T45 < 6.0.
18. The imaging lens according to any one of claims 10 to 14, wherein a radius of curvature R2 of an image-side surface of the first lens and a radius of curvature R3 of an object-side surface of the second lens satisfy 0 < (R2-R3)/(R2+ R3) ≦ 0.20.
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