CN217767011U - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN217767011U CN217767011U CN202221346551.XU CN202221346551U CN217767011U CN 217767011 U CN217767011 U CN 217767011U CN 202221346551 U CN202221346551 U CN 202221346551U CN 217767011 U CN217767011 U CN 217767011U
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Abstract
The utility model relates to an imaging lens follows the direction of optical axis from the thing side to picture side, includes in proper order: the lens comprises a first lens (L1) with positive focal power, a second lens (L2) with positive focal power, a third lens (L3), a diaphragm (S), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) with negative focal power, a seventh lens (L7), an eighth lens (L8) and a ninth lens (L9), wherein the fourth lens (L4) has negative focal power. Through the utility model discloses an optics framework makes imaging lens realize that the big light ring that small volume, high resolution, FNO number are less than or equal to 1.24, distortion absolute value are less than 2% low distortion and relative illuminance are greater than the performance characteristic of 60% high illuminance.
Description
Technical Field
The utility model relates to an optical system technical field especially relates to an imaging lens.
Background
The existing sighting lens on the market is mainly used for imaging in middle and short infrared bands, the image contrast is low, the resolution detail capability of the lens is poor, the sighting lens cannot be used in the daytime and at night, the problems of large size, low reliability and the like exist simultaneously, and the requirement of user demands and the requirement of the market for higher performance of the lens are difficult to meet.
SUMMERY OF THE UTILITY MODEL
For solving the problem that above-mentioned prior art exists, the utility model aims to provide an imaging lens, when realizing the confocality day and night, still satisfy the big light ring that realizes little volume, high resolution, FNO number and is less than or equal to 1.24, the distortion absolute value is less than 2% low distortion and relative illumination intensity and is greater than 60% high illumination's performance characteristic, and can carry out whole group along with the object distance change and focus.
To achieve the above object, the present invention provides an imaging lens, sequentially including, along an optical axis from an object side to an image side: the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens with negative focal power, a seventh lens, an eighth lens and a ninth lens, wherein the fourth lens has negative focal power.
According to an aspect of the invention, the third lens and the seventh lens each have a negative power;
the fifth lens, the eighth lens, and the ninth lens have positive optical power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
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 type lens.
According to an aspect of the present invention, the second lens and the third lens are cemented to constitute a first cemented lens group.
According to an 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 more than or equal to-0.99 and less than or equal to-0.89.
According to an aspect of the present invention, the fourth lens, the fifth lens and the sixth lens are cemented to form a second cemented lens group.
According to an aspect of the utility model, the focus F2 of second cemented lens group with imaging lens's total focal length F satisfies the relational expression: F2/F is more than or equal to-1.17 and less than or equal to-1.12.
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 an aspect of the utility model, the focal length F3 of third cemented lens group with imaging lens's total focal length F satisfies the relational expression: F3/F is more than or equal to 0.87 and less than or equal to 0.94.
According to an aspect of the present invention, the focal length F9 of the ninth lens and the total focal length F of the imaging lens satisfy the following relation: F9/F is more than or equal to 1.07 and less than or equal to 1.09.
According to an aspect of the utility model, the lens limit of the biggest optical effective diameter department of first lens thick D with first lens is at epaxial central thickness D and satisfies the relational expression: D/D is more than or equal to 0.32 and less than or equal to 0.37.
According to the utility model discloses an aspect, imaging lens's optics total length TTL with imaging lens's total focal length F satisfies the relational expression: TTL/F is more than or equal to 1.6 and less than or equal to 1.7.
According to one aspect of the present invention, by using nine lenses and setting the focal powers of the first to ninth lenses to "positive, negative, positive" in order, and different shapes of the lenses are reasonably matched, so that the imaging lens is miniaturized and has small volume, and the whole group of focusing can be carried out 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 and 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 less than 2% and high illumination with the relative illumination greater than 60%, and realizes high-resolution imaging quality with visible light and infrared light wave bands both 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 used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 schematically shows a schematic structural view of an imaging lens according to embodiment 1 of the present invention;
fig. 2 is a diagram schematically showing the relative illuminance of the imaging lens according to embodiment 1 of the present invention;
fig. 3 schematically shows a distortion diagram of an imaging lens according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of an imaging lens according to embodiment 2 of the present invention;
fig. 5 is a diagram schematically showing the relative illuminance of an imaging lens according to embodiment 2 of the present invention;
fig. 6 is a schematic diagram showing a distortion diagram of an imaging lens according to embodiment 2 of the present invention;
fig. 7 is a schematic view showing a structure of an imaging lens according to embodiment 3 of the present invention;
fig. 8 is a diagram schematically showing the relative illuminance of an imaging lens according to embodiment 3 of the present invention;
fig. 9 schematically shows a distortion diagram of an imaging lens according to embodiment 3 of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the appended drawings are intended to be part of the entire specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations in the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present individually or in combination, and the present invention is not limited to the preferred embodiments in particular. The scope of the present invention is defined by the claims.
Referring to fig. 1, an embodiment of the present invention provides an imaging lens, sequentially including, 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 stop S, 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.
In the embodiment of the present invention, the object-side surface of the first lens element L1, the second lens element L2, the third lens element L3 and the ninth lens element L9 is a convex surface, and the image-side surface thereof is a concave surface. 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 L5 and the eighth lens L8 are convex. The object-side surface of the sixth lens element L6 is concave, and the image-side surface thereof is convex. The object-side surface and the image-side surface of the seventh lens L7 are both concave.
Therefore, the focal powers of the nine lenses are sequentially set to be positive, negative, positive and positive, and the 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 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 and night confocal characteristic can be realized, and meanwhile, the large aperture characteristic that FNO (FNO) is less than or equal to 1.24 can be realized by the imaging lens.
In the embodiment of the present 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. Through the arrangement of the three cemented lens groups, wherein the first cemented lens group and the third cemented lens group can be called as double cemented lenses, and the second cemented lens group can be called as triple cemented lenses, system aberration can be corrected, tolerance sensitivity between lenses in the optical system can be avoided, and the imaging lens can realize high imaging performance characteristics that the wave bands of visible light and infrared light can reach more than 400 ten thousand pixels.
The embodiment of the utility model provides an in, focus F1 of first cemented lens group, focus F2 of second cemented lens group and focus F3 of third cemented lens group satisfy following relational expression with imaging lens's total focus F respectively: F1/F is more than or equal to-0.99 and less than or equal to-0.89; F2/F is more than or equal to-1.17 and less than or equal to-1.12; and F3/F is more than or equal to 0.87 and less than or equal to 0.94. Under the relation, the distortion absolute value of the imaging lens is less than 3%, namely, the low distortion of lens imaging is ensured, and meanwhile, the integral tolerance sensitivity of the imaging lens is reduced, so that the imaging lens has higher imaging quality and performance.
In the embodiment of the utility model, the focus F9 of ninth lens L9 and imaging lens's total focal length F satisfy the relational expression: F9/F is more than or equal to 1.07 and less than or equal to 1.09. Under the relation, the relative illumination of the imaging lens is larger than 60%, namely the imaging lens is ensured to have high illumination performance.
The embodiment of the utility model provides an in, the thick D in lens limit of the biggest optics effective diameter department of first lens L1 satisfies the relational expression with first lens L1 at the epaxial center thickness D of light: D/D is more than or equal to 0.32 and less than or equal to 0.37. Under the relation, the possibility that the lens is fragile due to collision can be reduced.
The embodiment of the utility model provides an in, imaging lens's total optical length TTL and imaging lens's total focal length F satisfy the relational expression: 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 following describes the imaging lens of the present invention in detail by using 3 embodiments in conjunction with the accompanying drawings and tables. In each of the following embodiments, the present invention records the diaphragm S as one surface, the image plane IMA as one surface, and the parallel plate CG as two surfaces.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
| conditional formula (II) | Example 1 | Example 2 | Example 3 |
| -0.99≤F1/F≤-0.89 | -0.955 | -0.970 | -0.913 |
| -1.17≤F2/F≤-1.12 | -1.137 | -1.131 | -1.156 |
| 0.87≤F3/F≤0.94 | 0.925 | 0.926 | 0.891 |
| 1.07≤F9/F≤1.09 | 1.084 | 1.077 | 1.085 |
| 0.32≤d/D≤0.37 | 0.335 | 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:
FNO:1.24; total optical length TTL:49.998mm; focal length F:30.8mm.
The fourth lens L4 is a concave-concave lens (concave on both the object-side surface and the image-side surface).
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.
| Number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 22.177 | 4.6 | 1.92 | 20.9 |
| S2 | Spherical surface | 79.088 | 0.102 | ||
| S3 | Spherical surface | 13.08 | 5.38 | 1.59 | 68.6 |
| S4 | Spherical surface | 92.93 | 1.73 | 1.81 | 22.7 |
| S5 | Spherical surface | 8.029 | 3.743 | ||
| S6(S) | Spherical surface | Infinity | 0.298 | ||
| S7 | Spherical surface | -607.47 | 0.8 | 1.63 | 35.7 |
| S8 | Spherical surface | 8.027 | 6.6 | 1.59 | 68.6 |
| S9 | Spherical surface | -8.027 | 0.8 | 1.81 | 22.7 |
| S10 | Spherical surface | -165.906 | 1.584 | ||
| S11 | Spherical surface | -13.36 | 0.8 | 1.53 | 48.9 |
| S12 | Spherical surface | 44.337 | 4.01 | 1.83 | 37.2 |
| S13 | Spherical surface | -13.476 | 1.819 | ||
| S14 | Spherical surface | 22.269 | 6.37 | 1.96 | 17.5 |
| S15 | Spherical surface | 60.975 | 5.522 | ||
| S16 | Spherical surface | Infinity | 1.5 | 1.52 | 64.2 |
| S17 | Spherical surface | Infinity | 4.34 | ||
| S18(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 2
As shown in fig. 1 to 3 and tables 1 to 2, the imaging lens of the present embodiment has the following high performance characteristics: the optical lens meets the performance characteristics of small volume, high resolution, large aperture with FNO number of 1.24, low distortion with distortion absolute value less than 2 percent and high illumination with relative illumination greater than 60 percent, and can carry out whole group focusing along with the change of object distance. The infrared band has good performance, the wavelength of the infrared band can reach 940nm, and day and night confocal can be realized. The imaging lens also realizes high-quality imaging with visible light and infrared light wave bands of more than 400 ten thousand pixels. Fig. 2 and 3 show the imaging performance of the imaging lens of the present embodiment with 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:
FNO:1.23; total optical length TTL:50.11mm; focal length F:30.88mm.
The fourth lens element L4 is a plano-concave lens element (the object-side surface is a flat surface, and the image-side surface is a concave surface).
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.
| Noodle sequence number | Surface type | R value | Thickness of | 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
As shown in fig. 4 to 6 and tables 1 and 3, the imaging lens of the present embodiment has the following high performance characteristics: the optical lens meets 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 percent and high illumination with relative illumination greater than 60 percent, and can carry out whole group focusing along with the change of object distance. The infrared band has good performance, the wavelength of the infrared band can reach 940nm, and day and night confocal can be realized. The imaging lens also realizes high-quality imaging with visible light and infrared light wave bands of more than 400 ten thousand pixels. Fig. 5 and 6 show the imaging performance of the imaging lens of the present embodiment with high illumination and low distortion, respectively.
Example 3
Referring to fig. 7, the parameters of the imaging lens of the present embodiment are as follows:
FNO:1.23; total optical length TTL:49.999mm; focal length F:30.8mm.
The fourth lens L4 is a lens having a concave-convex shape (the object side surface is convex, and the image side surface is concave).
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
As shown in fig. 7 to 9 and tables 1 and 4 described above, the imaging lens of the present embodiment has the following high performance characteristics: the optical lens meets 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 percent and high illumination with relative illumination greater than 60 percent, and can carry out whole-group focusing along with the change of object distance. The infrared band has good performance, the wavelength of the infrared band can reach 940nm, and day and night confocal can be realized. The imaging lens also realizes high-quality imaging with visible light and infrared light wave bands of more than 400 ten thousand pixels. Fig. 8 and 9 show the imaging performance of the imaging lens of the present embodiment with high illumination and low distortion, respectively.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An imaging lens, comprising in order along an optical axis from an object side to an image side: -a first lens (L1) with positive power, -a second lens (L2) with positive power, -a third lens (L3), -a diaphragm (S), -a fourth lens (L4), -a fifth lens (L5), -a sixth lens (L6) with negative power, -a seventh lens (L7), -an eighth lens (L8) and-a ninth lens (L9), characterized in that said fourth lens (L4) has negative power.
2. The imaging lens according to claim 1, characterized in that the third lens (L3) and the seventh lens (L7) each have a negative optical power;
the fifth lens (L5), the eighth lens (L8), and the ninth lens (L9) each have positive optical power.
3. The imaging lens according to claim 1, wherein in a direction from an object side to an image side along an 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 lenses;
the sixth lens (L6) is a concave-convex lens;
the seventh lens (L7) is a concave-concave type lens.
4. Imaging lens according to claim 1, characterized in that the second lens (L2) and the third lens (L3) are cemented to constitute a first cemented lens group.
5. The imaging lens according to claim 4, wherein a focal length F1 of the first cemented lens group and a total focal length F of the imaging lens satisfy the relation: F1/F is more 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 fourth lens (L4), the fifth lens (L5) and the sixth lens (L6) are cemented to constitute a second cemented lens group.
7. The imaging lens according to claim 6, wherein a focal length F2 of the second cemented lens group and a total focal length F of the imaging lens satisfy the relation: F2/F is more than or equal to-1.17 and less than or equal to-1.12.
8. Imaging lens according to claim 1, characterized in that the seventh lens (L7) and the eighth lens (L8) are cemented to constitute a third cemented lens group.
9. The imaging lens according to claim 8, wherein a focal length F3 of the third cemented lens group and a total focal length F of the imaging lens satisfy the relation: F3/F is more than or equal to 0.87 and less than or equal to 0.94.
10. An imaging lens according to any one of claims 1 to 9, characterized in that 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 more than or equal to 1.07 and less than or equal to 1.09.
11. An imaging lens according to any one of claims 1 to 9, characterized in that the edge thickness D of the lens at the maximum optical effective diameter of the first lens (L1) and the central thickness D of the first lens (L1) on the optical axis satisfy the relation: D/D is more than or equal to 0.32 and less than or equal to 0.37.
12. The imaging lens of any one of claims 1 to 9, wherein 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815169A (en) * | 2022-05-31 | 2022-07-29 | 舜宇光学(中山)有限公司 | Imaging lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815169A (en) * | 2022-05-31 | 2022-07-29 | 舜宇光学(中山)有限公司 | Imaging lens |
| CN114815169B (en) * | 2022-05-31 | 2024-02-23 | 舜宇光学(中山)有限公司 | Imaging lens |
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