CN114815169B - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN114815169B CN114815169B CN202210613175.4A CN202210613175A CN114815169B CN 114815169 B CN114815169 B CN 114815169B CN 202210613175 A CN202210613175 A CN 202210613175A CN 114815169 B CN114815169 B CN 114815169B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 86
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 238000005286 illumination Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
-
- 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention relates to an imaging lens, which sequentially comprises the following components along an optical axis from an object side to an image side: a first lens (L1) having positive optical power, a second lens (L2) having positive optical power, a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) having negative optical power, a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9), the fourth lens (L4) having negative optical power. Through the optical architecture of the invention, the imaging lens realizes the performance characteristics of small volume, high resolution, large aperture with FNO number less than or equal to 1.24, low distortion with distortion absolute value less than 2% and high illuminance with relative illuminance more than 60%.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to an imaging lens.
Background
Most of the existing aiming lenses in the market are used for imaging in the middle-short infrared band, the image contrast is low, so that the resolution capability of the lenses is poor, the aiming lenses cannot be used at the same time in the daytime and at night, meanwhile, the problems of large volume, low reliability and the like exist, and the requirements of users and markets on higher performance of the lenses are difficult to meet.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an imaging lens, which realizes day-night confocal, simultaneously realizes the performance characteristics of small volume, high resolution, large aperture with FNO number less than or equal to 1.24, low distortion with distortion absolute value less than 2% and high illuminance with relative illuminance greater than 60%, and can perform whole group focusing along with the change of object distance.
In order to achieve the above object, the present invention provides an imaging lens, including, in order from an object side to an image side along an optical axis: a first lens having positive optical power, a second lens having positive optical power, a third lens, a fourth lens having negative optical power, a fifth lens, a sixth lens having negative optical power, a seventh lens, an eighth lens, and a ninth lens.
According to one aspect of the invention, the third lens and the seventh lens each have negative optical power;
the fifth lens, the eighth lens, and the ninth lens have positive optical power.
According to an aspect of the present invention, the imaging lens further includes a diaphragm, the diaphragm being located between the third lens and the fourth lens.
According to one aspect of the invention, the optical axis is oriented in a direction from the object side to the image side,
the first lens, the second lens, the third lens and the ninth lens are all convex-concave lenses;
the fourth lens is a convex-concave lens, a concave-concave lens or a plano-concave lens;
the fifth lens and the eighth lens are convex lenses;
the sixth lens is a concave-convex lens;
the seventh lens is a concave-concave lens.
According to one aspect of the invention, the second lens and the third lens are cemented to form a first cemented lens group.
According to one aspect of the present invention, the focal length F1 of the first cemented lens group and the total focal length F of the imaging lens satisfy the relation: F1/F is less than or equal to-0.99 and less than or equal to-0.89.
According to one aspect of the present invention, the fourth lens, the fifth lens and the sixth lens are cemented to constitute a second cemented lens group.
According to one aspect of the present invention, the focal length F2 of the second cemented lens group and the total focal length F of the imaging lens satisfy the relation: F2/F is less than or equal to-1.18 and less than or equal to-1.06.
According to an aspect of the present invention, the seventh lens and the eighth lens are cemented to constitute a third cemented lens group.
According to one aspect of the present invention, the focal length F3 of the third cemented lens group and the total focal length F of the imaging lens satisfy the relation: F3/F is more than or equal to 0.86 and less than or equal to 0.95.
According to one aspect of the present invention, a focal length F9 of the ninth lens and a total focal length F of the imaging lens satisfy the relation: F9/F is less than or equal to 1.05 and less than or equal to 1.10.
According to one aspect of the present invention, the lens side thickness D at the maximum optical effective diameter of the first lens and the center thickness D of the first lens on the optical axis satisfy the relationship: D/D is more than or equal to 0.28 and less than or equal to 0.38.
According to one aspect of the present invention, the optical total length TTL of the imaging lens and the total focal length F of the imaging lens satisfy the relation: TTL/F is less than or equal to 1.6 and less than or equal to 1.7.
According to one scheme of the invention, nine lenses are adopted, the focal powers of the first lens to the ninth lens are sequentially set to be positive, negative, positive and positive, and different shapes of the lenses are reasonably matched, so that the imaging lens is miniaturized and small in size, and the whole group of focusing can be carried out along with the change of object distances. The infrared band imaging performance is good, the wavelength of the infrared band can reach 940nm, the day-night confocal characteristic can be realized, and meanwhile, the imaging lens is ensured to realize the large aperture characteristic that FNO is less than or equal to 1.24. The imaging lens also has the performance characteristics of low distortion with the distortion absolute value smaller than 2% and high illumination with the relative illumination larger than 60%, and can realize high-resolution imaging quality with the visible light and infrared light wave bands reaching more than 400 ten thousand pixels.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 schematically shows a structural diagram of an imaging lens of embodiment 1 of the present invention;
fig. 2 schematically shows a relative illuminance map of an imaging lens of embodiment 1 of the present invention;
fig. 3 schematically shows a distortion chart of an imaging lens of embodiment 1 of the present invention;
fig. 4 schematically shows a structural diagram of an imaging lens of embodiment 2 of the present invention;
fig. 5 schematically shows a relative illuminance map of an imaging lens of embodiment 2 of the present invention;
fig. 6 schematically shows a distortion chart of an imaging lens of embodiment 2 of the present invention;
fig. 7 schematically shows a structural diagram of an imaging lens of embodiment 3 of the present invention;
fig. 8 schematically shows a relative illuminance map of an imaging lens of embodiment 3 of the present invention;
fig. 9 schematically shows a distortion chart of an imaging lens of embodiment 3 of the present invention.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
Referring to fig. 1, an embodiment of the present invention provides an imaging lens, including, in order along an optical axis from an object side to an image side: a first lens L1 having positive power, a second lens L2 having positive power, a third lens L3 having negative power, a fourth lens L4 having negative power, a fifth lens L5 having positive power, a sixth lens L6 having negative power, a seventh lens L7 having negative power, an eighth lens L8 having positive power, a ninth lens L9 having positive power, and a parallel plate CG. The imaging lens further includes a stop S located between the third lens L3 and the fourth lens L4.
In the embodiment of the invention, the object side surfaces of the first lens element L1, the second lens element L2, the third lens element L3 and the ninth lens element L9 are convex, and the image side surfaces thereof are concave. The object-side surface of the fourth lens element L4 is convex, concave or planar, and the image-side surface of the fourth lens element L4 is concave regardless of whether the object-side surface is convex or concave or planar. The object side surface and the image side surface of the fifth lens element L5 and the eighth lens element L8 are convex. The sixth lens element L6 has a concave object-side surface and a convex image-side surface. The object side surface and the image side surface of the seventh lens L7 are both concave surfaces.
Therefore, the optical power of the nine lenses is sequentially set as positive, negative, positive and positive, and the lens shapes are reasonably matched, so that the imaging lens is miniaturized and small in size, and the whole group focusing can be performed along with the change of the object distance. The infrared band imaging performance is good, the wavelength of the infrared band can reach 940nm, the day-night confocal characteristic can be realized, and meanwhile, the imaging lens is ensured to realize the large aperture characteristic that FNO is less than or equal to 1.24.
In the embodiment of the invention, the second lens L2 and the third lens L3 are cemented to form a first cemented lens group. The fourth lens L4, the fifth lens L5, and the sixth lens L6 are cemented to constitute a second cemented lens group. The seventh lens L7 and the eighth lens L8 are cemented to constitute a third cemented lens group. By arranging three cemented lens groups, wherein the first cemented lens group and the third cemented lens group can be also called as double cemented lenses, and the second cemented lens group can be also called as triple cemented lenses, the aberration of the system can be corrected, the tolerance sensitivity between lenses in the optical system can be avoided, and the imaging lens can realize high imaging performance characteristics of more than 400 ten thousand pixels in both visible light and infrared light wave bands.
In the embodiment of the present invention, the focal length F1 of the first cemented lens group, the focal length F2 of the second cemented lens group, and the focal length F3 of the third cemented lens group respectively satisfy the following relation with the total focal length F of the imaging lens: F1/F is less than or equal to-0.99 and less than or equal to-0.89; F2/F is less than or equal to-1.18 and less than or equal to-1.06; F3/F is more than or equal to 0.86 and less than or equal to 0.95. Under the relation, the absolute value of distortion of the imaging lens is smaller than 3%, namely, the low distortion of imaging of the lens is ensured, and meanwhile, the overall tolerance sensitivity of the imaging lens is reduced, so that the imaging lens has higher imaging quality and performance.
In the embodiment of the present invention, the focal length F9 of the ninth lens L9 and the total focal length F of the imaging lens satisfy the relation: F9/F is less than or equal to 1.05 and less than or equal to 1.10. Under the relation, the relative illumination of the imaging lens is more than 60%, namely, the imaging lens is guaranteed to have high illumination performance.
In the embodiment of the present invention, the lens edge thickness D at the maximum optical effective diameter of the first lens L1 and the center thickness D of the first lens L1 on the optical axis satisfy the relationship: D/D is more than or equal to 0.28 and less than or equal to 0.38. Under this relationship, the likelihood of the lens being fragile due to impact is reduced.
In the embodiment of the invention, the total optical length TTL of the imaging lens and the total focal length F of the imaging lens satisfy the relation: TTL/F is more than or equal to 1.6 and less than or equal to 1.7, so that the imaging lens is smaller in size and miniaturized.
The imaging lens of the present invention will be specifically described below with reference to the accompanying drawings and tables in 3 embodiments. In the following embodiments, the present invention refers to the diaphragm S as one side, the image plane IMA as one side, and the parallel flat CG as two sides.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
| conditional expression | Example 1 | Example 2 | Example 3 |
| -0.99≤F1/F≤-0.89 | -0.910 | -0.970 | -0.913 |
| -1.18≤F2/F≤-1.06 | -1.090 | -1.131 | -1.156 |
| 0.86≤F3/F≤0.95 | 0.883 | 0.926 | 0.891 |
| 1.05≤F9/F≤1.10 | 1.060 | 1.077 | 1.085 |
| 0.28≤d/D≤0.38 | 0.307 | 0.360 | 0.356 |
| 1.6≤TTL/F≤1.7 | 1.623 | 1.623 | 1.623 |
TABLE 1
Example 1
Referring to fig. 1, the parameters of the imaging lens of the present embodiment are as follows:
and F, NO:1.23; optical total length TTL:49.999mm; focal length F:30.8mm.
The fourth lens L4 is a concave lens (both the object side surface and the image side surface are concave).
Table 2 lists relevant parameters of each lens in the imaging lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
| Face number | Surface type | R value | Thickness of (L) | Refractive index | Abbe number |
| S1 | Spherical surface | 22.018 | 4.635 | 1.92 | 20.9 |
| S2 | Spherical surface | 80.115 | 0.1 | ||
| S3 | Spherical surface | 13.198 | 5.404 | 1.59 | 68.6 |
| S4 | Spherical surface | 117.316 | 1.85 | 1.81 | 22.7 |
| S5 | Spherical surface | 7.929 | 3.695 | ||
| S6(S) | Spherical surface | Infinity | 0.3 | ||
| S7 | Spherical surface | -507.631 | 0.8 | 1.63 | 35.7 |
| S8 | Spherical surface | 7.87 | 6.623 | 1.59 | 68.6 |
| S9 | Spherical surface | -7.87 | 0.8 | 1.81 | 22.7 |
| S10 | Spherical surface | -178.259 | 1.55 | ||
| S11 | Spherical surface | -13.573 | 0.8 | 1.53 | 48.9 |
| S12 | Spherical surface | 42.042 | 4.076 | 1.83 | 37.2 |
| S13 | Spherical surface | -13.33 | 2.51 | ||
| S14 | Spherical surface | 20.67 | 5.405 | 1.96 | 17.5 |
| S15 | Spherical surface | 51.645 | 5.451 | ||
| S16 | Spherical surface | Infinity | 1.5 | 1.52 | 64.2 |
| S17 | Spherical surface | Infinity | 4.5 | ||
| S18(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 2
Referring to fig. 1 to 3 and tables 1 to 2, the imaging lens of the present embodiment has the following high performance characteristics: the performance characteristics of small volume, high resolution, large aperture with FNO number of 1.23, low distortion with distortion absolute value less than 2% and high illuminance with relative illuminance more than 60% are satisfied, and the whole group of focusing can be performed along with the change of object distance. The infrared band has good performance, the wavelength of the infrared band can reach 940nm, and day-night confocal can be realized. The imaging lens also realizes high-quality imaging with visible light and infrared light wave bands reaching more than 400 ten thousand pixels. Fig. 2 and 3 show the imaging performance of the imaging lens in this embodiment, which is high illumination and low distortion, respectively.
Example 2
Referring to fig. 4, the parameters of the imaging lens of the present embodiment are as follows:
and F, NO:1.23; optical total length TTL:50.11mm; focal length F:30.88mm.
The fourth lens L4 is a lens having a plano-concave shape (the object side surface is a plane, and the image side surface is concave).
Table 3 lists relevant parameters of each lens in the imaging lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
| Face number | Surface type | R value | Thickness of (L) | Refractive index | Abbe number |
| S1 | Spherical surface | 22.16 | 4.57 | 1.92 | 20.9 |
| S2 | Spherical surface | 76.325 | 0.101 | ||
| S3 | Spherical surface | 13.053 | 5.35 | 1.59 | 68.6 |
| S4 | Spherical surface | 81.287 | 1.72 | 1.81 | 22.7 |
| S5 | Spherical surface | 8.055 | 3.913 | ||
| S6(S) | Spherical surface | Infinity | 0.3 | ||
| S7 | Spherical surface | Infinity | 0.8 | 1.63 | 35.7 |
| S8 | Spherical surface | 8.06 | 6.56 | 1.59 | 68.6 |
| S9 | Spherical surface | -8.06 | 0.8 | 1.81 | 22.7 |
| S10 | Spherical surface | -227.154 | 1.624 | ||
| S11 | Spherical surface | -13.197 | 0.8 | 1.53 | 48.9 |
| S12 | Spherical surface | 45.746 | 4.01 | 1.83 | 37.2 |
| S13 | Spherical surface | -13.384 | 1.784 | ||
| S14 | Spherical surface | 22.049 | 6.3 | 1.96 | 17.5 |
| S15 | Spherical surface | 59.607 | 5.378 | ||
| S16 | Spherical surface | Infinity | 1.5 | 1.52 | 64.2 |
| S17 | Spherical surface | Infinity | 4.600 | ||
| S18(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 3 Table 3
As shown in fig. 4 to 6 and the above tables 1 and 3, the imaging lens of the present embodiment has the following high performance characteristics: the performance characteristics of small volume, high resolution, large aperture with FNO number of 1.23, low distortion with distortion absolute value less than 2% and high illuminance with relative illuminance more than 60% are satisfied, and the whole group of focusing can be performed along with the change of object distance. The infrared band has good performance, the wavelength of the infrared band can reach 940nm, and day-night confocal can be realized. The imaging lens also realizes high-quality imaging with visible light and infrared light wave bands reaching more than 400 ten thousand pixels. Fig. 5 and 6 show the imaging performance of the imaging lens in this embodiment, which is high illumination and low distortion, respectively.
Example 3
Referring to fig. 7, the imaging lens of the present embodiment has the following parameters:
and F, NO:1.23; optical total length TTL:49.999mm; focal length F:30.8mm.
The fourth lens L4 is a convex-concave lens (convex object side surface, concave image side surface).
Table 4 lists relevant parameters of each lens in the imaging lens of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
TABLE 4 Table 4
As shown in fig. 7 to 9 and the above tables 1 and 4, the imaging lens of the present embodiment has the following high performance characteristics: the performance characteristics of small volume, high resolution, large aperture with FNO number of 1.23, low distortion with distortion absolute value less than 2% and high illuminance with relative illuminance more than 60% are satisfied, and the whole group of focusing can be performed along with the change of object distance. The infrared band has good performance, the wavelength of the infrared band can reach 940nm, and day-night confocal can be realized. The imaging lens also realizes high-quality imaging with visible light and infrared light wave bands reaching more than 400 ten thousand pixels. Fig. 8 and 9 show imaging performance of the imaging lens of the present embodiment with high illuminance and low distortion, respectively.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. An imaging lens, in a direction from an object side to an image side along an optical axis, comprising in order: a first lens (L1) having positive optical power, a second lens (L2) having positive optical power, a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) having negative optical power, a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9), characterized in that the fourth lens (L4) has negative optical power;
-the third lens (L3) and the seventh lens (L7) each have negative optical power;
-the fifth lens (L5), the eighth lens (L8) and the ninth lens (L9) each have positive optical power;
-said fourth lens (L4), said fifth lens (L5) and said sixth lens (L6) are cemented to form a second cemented lens group;
the focal length F2 of the second cemented lens group and the total focal length F of the imaging lens satisfy the relation: F2/F is less than or equal to-1.18 and less than or equal to-1.06.
2. The imaging lens according to claim 1, characterized in that it further comprises a diaphragm (S) located between the third lens (L3) and the fourth lens (L4).
3. The imaging lens as claimed in claim 1, wherein, in a direction from the object side to the image side along the optical axis,
the first lens (L1), the second lens (L2), the third lens (L3) and the ninth lens (L9) are all convex-concave lenses;
the fourth lens (L4) is a convex-concave lens, a concave-concave lens or a plano-concave lens;
the fifth lens (L5) and the eighth lens (L8) are both convex-convex lenses;
the sixth lens (L6) is a concave-convex lens;
the seventh lens (L7) is a concave-concave lens.
4. Imaging lens according to claim 1, characterized in that the second lens (L2) and the third lens (L3) are cemented into a first cemented lens group.
5. The imaging lens as claimed in claim 4, wherein a focal length F1 of the first cemented lens group and a total focal length F of the imaging lens satisfy a relation: F1/F is less than or equal to-0.99 and less than or equal to-0.89.
6. Imaging lens according to claim 1, characterized in that the seventh lens (L7) and the eighth lens (L8) are cemented to form a third cemented lens group.
7. The imaging lens as claimed in claim 6, wherein a focal length F3 of the third cemented lens group and a total focal length F of the imaging lens satisfy a relation: F3/F is more than or equal to 0.86 and less than or equal to 0.95.
8. The imaging lens according to any one of claims 1-7, wherein a focal length F9 of the ninth lens (L9) and a total focal length F of the imaging lens satisfy the relation: F9/F is less than or equal to 1.05 and less than or equal to 1.10.
9. The imaging lens according to any one of claims 1 to 7, wherein a lens side thickness D at a maximum optical effective diameter of the first lens (L1) and a center thickness D of the first lens (L1) on an optical axis satisfy a relation: D/D is more than or equal to 0.28 and less than or equal to 0.38.
10. The imaging lens of any of claims 1-7, wherein an optical total length TTL of the imaging lens and a total focal length F of the imaging lens satisfy the relation: TTL/F is less than or equal to 1.6 and less than or equal to 1.7.
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| CN209690600U (en) * | 2019-04-12 | 2019-11-26 | 奥普特视觉科技(苏州)有限公司 | A kind of low high-resolution linear array camera lens of distortion |
| CN212364690U (en) * | 2020-05-26 | 2021-01-15 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| WO2022032920A1 (en) * | 2020-08-11 | 2022-02-17 | 苏州中科全象智能科技有限公司 | Projection lens |
| CN114167579A (en) * | 2021-11-08 | 2022-03-11 | 浙江大华技术股份有限公司 | Lens |
| CN217767011U (en) * | 2022-05-31 | 2022-11-08 | 舜宇光学(中山)有限公司 | Imaging lens |
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