CN214151213U - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN214151213U CN214151213U CN202120407844.3U CN202120407844U CN214151213U CN 214151213 U CN214151213 U CN 214151213U CN 202120407844 U CN202120407844 U CN 202120407844U CN 214151213 U CN214151213 U CN 214151213U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses an optical imaging lens, which comprises a first lens to an eleventh lens from an object side to an image side along an optical axis in sequence; the first lens, the second lens and the seventh lens are convex-concave lenses with negative refraction; the third lens element and the tenth lens element are both concave and convex lenses with negative refractive index, the fourth lens element, the sixth lens element, the eighth lens element and the eleventh lens element are all convex and convex lenses with positive refractive index, the fifth lens element is a convex and concave lens with positive refractive index, the ninth lens element is with positive refractive index and the image side surface is convex, the fifth lens element and/or the sixth lens element is/are aspheric lens elements, and the refractive index temperature coefficients of the eighth lens element and the ninth lens element are negative values. The utility model has the advantages of total length, small volume, high resolution, large light transmission, large image surface, high imaging quality and good temperature drift control.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, security monitoring, machine vision, vehicle-mounted monitoring auxiliary driving, unmanned aerial vehicle aerial photography and the like, so that the requirements on the optical imaging lenses are higher and higher.
However, the optical imaging lens applied to the vehicle-mounted ADAS (advanced driver assistance system) at present has many defects, such as low requirement on reliability and incapability of meeting the requirements of vehicle specifications; the resolution is not high, and the resolution is reduced sharply especially in a large target surface area; the light transmission is small, the energy utilization rate is low, and the low-light effect is poor; to achieve high quality, the structure is complex, the outer diameter is large, and the total length is long; the high and low temperature easily run coke, can not meet the requirements of vehicle specifications and the like, can not meet the increasingly improved requirements of vehicle-mounted ADAS, and needs to be improved urgently.
Disclosure of Invention
An object of the utility model is to provide an optical imaging lens is used for solving the technical problem that the above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens element to the eleventh lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive power has a convex image-side surface;
the tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the eleventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the fifth lens and/or the sixth lens are/is an aspheric lens, and the temperature coefficients of the refractive indexes of the eighth lens and the ninth lens are negative values;
the optical imaging lens has only the first lens element to the eleventh lens element with refractive index.
Further, the optical imaging lens further satisfies: -1.3< f3/f4< -0.8, wherein f3 is the focal length of the third lens and f4 is the focal length of the fourth lens.
Further, the optical imaging lens further satisfies: T1/D1 is more than or equal to 0.1, D12/R12 is more than or equal to 1.6, wherein T1 is the thickness of the first lens on the optical axis, D1 is the outer diameter of the first lens, D12 is the aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.
Further, the optical imaging lens further satisfies: 0.8< f1/f2<1.3, wherein f1 is the focal length of the first lens and f2 is the focal length of the second lens.
Further, the optical imaging lens further satisfies: vd2 > 50, where vd2 is the Abbe number of the second lens.
Further, the third lens and the fourth lens are cemented with each other, the seventh lens and the eighth lens are cemented with each other, and the ninth lens and the tenth lens are cemented with each other.
Further, the optical imaging lens further satisfies: vd8-vd7 > 30, vd9-vd10 > 30, wherein vd7 is the abbe number of the seventh lens, vd8 is the abbe number of the eighth lens, vd9 is the abbe number of the ninth lens, and vd10 is the abbe number of the tenth lens.
Further, the optical imaging lens further satisfies: TTL/BFL is more than or equal to 9, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis; and BFL is the optical back focus of the optical imaging lens.
Further, the optical imaging lens further satisfies: D112/IMH is more than 0.8, wherein D112 is the aperture of the image side surface of the eleventh lens, and IMH is the size of the target surface of the optical imaging lens.
Further, the optical imaging lens further satisfies: nd11 is greater than 1.8, where nd11 is the refractive index of the eleventh lens.
The utility model has the advantages of:
the utility model adopts eleven lenses, and each lens is correspondingly designed, so that the requirement on reliability is high, and the reliability is high; the image surface is large; the resolution is high; the light transmission is large, and the low-light effect is good; the outer diameter is small, the total length is short, and the mass production is high; the non-thermalization treatment is better, and when the non-thermalization treatment is used in a temperature range of-40 ℃ to 105 ℃, the image is clear and is not out of focus.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF of visible light 436-;
FIG. 3 is a graph of MTF at 436- > 650nm for visible light at-40 ℃ below zero in accordance with the first embodiment of the present invention;
FIG. 4 is a graph of MTF of 436- "650 nm of visible light at high temperature (80 ℃);
fig. 5 is a contrast curve of 0.436 μm according to the first embodiment of the present invention;
fig. 6 is a color difference curve chart according to the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 8 is a graph of MTF of visible light 436- > 650nm at normal temperature (25 ℃);
FIG. 9 is a graph of MTF at 436- > 650nm for visible light at-40 ℃ in example II of the present invention;
FIG. 10 is a graph of MTF of 436- > 650nm of visible light at high temperature (80 ℃ C.) in example II of the present invention;
fig. 11 is a contrast curve of 0.436 μm according to the second embodiment of the present invention;
fig. 12 is a color difference graph according to the second embodiment of the present invention;
fig. 13 is a schematic structural view of a third embodiment of the present invention;
FIG. 14 is a graph of MTF of visible light 436- > 650nm at normal temperature (25 ℃);
FIG. 15 is a graph of MTF at 436- > 650nm for visible light at-40 ℃ in example III of the present invention;
FIG. 16 is a graph of MTF of 436- & 650nm visible light at high temperature (80 ℃ C.) in accordance with the third embodiment of the present invention;
fig. 17 is a contrast curve of 0.436 μm according to the third embodiment of the present invention;
fig. 18 is a color difference graph of the third embodiment of the present invention.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The utility model discloses an optical imaging lens, which comprises a first lens to an eleventh lens from an object side to an image side along an optical axis in sequence; the first lens element to the eleventh lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The second lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The third lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The seventh lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The ninth lens element with positive refractive power has a convex image-side surface.
The tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface.
The eleventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fifth lens and/or the sixth lens are/is an aspheric lens, so that the resolution is improved, the chromatic aberration is optimized, and the outer diameter and the total length of the optical system are greatly shortened.
The temperature coefficients of the refractive indexes of the eighth lens and the ninth lens are negative values, and the temperature drift is effectively balanced.
The optical imaging lens has only the first lens element to the eleventh lens element with refractive index. The utility model adopts eleven lenses, and each lens is correspondingly designed, so that the requirement on reliability is high, and the reliability is high; the image surface is large; the resolution is high; the light transmission is large, and the low-light effect is good; the outer diameter is small, the total length is short, and the mass production is high; the non-thermalization treatment is better, and when the non-thermalization treatment is used in a temperature range of-40 ℃ to 105 ℃, the image is clear and is not out of focus.
Preferably, the temperature coefficient of refractive index dn/dT < -2 x 10E-6 of the eighth lens in the temperature range of-40 ℃ to 105 ℃, and the temperature coefficient of refractive index dn/dT < -2 x 10E-6 of the ninth lens in the temperature range of-40 ℃ to 105 ℃ further effectively balance the temperature drift.
More preferably, the temperature coefficient of refractive index dn/dT < -6 x 10E-6 of the eighth lens and the ninth lens is used for balancing temperature drift more effectively and realizing no thermalization.
Preferably, the optical imaging lens further satisfies: 1.3< f3/f4< -0.8, wherein f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens, balance power and further control temperature drift.
Preferably, the optical imaging lens further satisfies: T1/D1 is more than or equal to 0.1, D12/R12 is more than or equal to 1.6, wherein T1 is the thickness of the first lens on the optical axis, D1 is the outer diameter of the first lens, D12 is the caliber of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens, so that the reliability and the reliability of the system are further improved, and reliability experiments such as vehicle ball falling, gravel falling and the like can be met.
Preferably, the optical imaging lens further satisfies: 0.8< f1/f2<1.3, wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens, balance the focal power and further improve the system performance.
Preferably, the optical imaging lens further satisfies: vd2 is more than 50, wherein vd2 is the dispersion coefficient of the second lens, and is matched with a low dispersion material, so that the off-axis chromatic aberration is favorably corrected.
Preferably, the third lens and the fourth lens are mutually cemented, the seventh lens and the eighth lens are mutually cemented, and the ninth lens and the tenth lens are mutually cemented, so as to further correct the off-axis chromatic aberration, improve the resolution and shorten the total length of the system.
More preferably, the optical imaging lens further satisfies: vd8-vd7 is more than 30, vd9-vd10 is more than 30, wherein vd7 is the dispersion coefficient of the seventh lens, vd8 is the dispersion coefficient of the eighth lens, vd9 is the dispersion coefficient of the ninth lens, and vd10 is the dispersion coefficient of the tenth lens.
Preferably, the optical imaging lens further satisfies: TTL/BFL is more than or equal to 9, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis; BFL is the optical back focus of the optical imaging lens, and the shorter back focus is beneficial to reducing the temperature drift caused by mechanical parts, reducing the temperature drift of the whole system and being beneficial to no thermalization.
Preferably, the optical imaging lens further satisfies: D112/IMH is more than 0.8, wherein D112 is the aperture of the image side surface of the eleventh lens, and IMH is the size of the target surface of the optical imaging lens, so that the whole light rays are relatively gently transited to the imaging surface, the CRA is reduced, the tolerance and the manufacturability are strong, and the mass production is better.
Preferably, the optical imaging lens further satisfies: nd11 > 1.8, where nd11 is the refractive index of the eleventh lens, reducing the outer diameter of the system while improving resolution.
The optical imaging lens of the present invention will be described in detail with reference to specific embodiments.
Example one
As shown in fig. 1, an optical imaging lens includes, in order along an optical axis I from an object side a1 to an image side a2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a stop 120, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, a protective glass 130, and an image plane 140; the first lens element 1 to the eleventh lens element 110 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
The first lens element 1 has a negative refractive index, and an object-side surface 11 of the first lens element 1 is convex and an image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is concave and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a positive refractive index, and an object-side surface 41 and an image-side surface 42 of the fourth lens element 4 are convex and substantially parallel to each other.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is concave.
The sixth lens element 6 has a positive refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is convex.
The seventh lens element 7 has a negative refractive index, and an object-side surface 71 of the seventh lens element 7 is convex and an image-side surface 72 of the seventh lens element 7 is concave.
The eighth lens element 8 has a positive refractive index, and an object-side surface 81 of the eighth lens element 8 is convex and an image-side surface 82 of the eighth lens element 8 is convex.
The ninth lens element 9 has a positive refractive index, and an object-side surface 91 of the ninth lens element 9 is concave and an image-side surface 92 of the ninth lens element 9 is convex. Of course, in other embodiments, the object side 91 of the ninth lens element 9 may be planar or convex.
The tenth lens element 100 has a negative refractive index, and an object-side surface 101 of the tenth lens element 100 is concave and an image-side surface 102 of the tenth lens element 100 is concave.
The eleventh lens element 110 has a positive refractive index, and an object-side surface 111 of the eleventh lens element 110 is convex and an image-side surface 112 of the eleventh lens element 110 is convex.
Preferably, in the present embodiment, the fifth lens 5 and the sixth lens 6 are both aspheric lenses, but the present invention is not limited thereto, and in some embodiments, only the fifth lens 5 or the sixth lens 6 may be aspheric lenses.
In this embodiment, the third lens 3 and the fourth lens 4 are cemented with each other, the seventh lens 7 and the eighth lens 8 are cemented with each other, and the ninth lens 9 and the tenth lens 10 are cemented with each other.
In the present embodiment, the temperature coefficient of refractive index of the eighth lens 8 and the ninth lens 9 is a negative value.
In other embodiments, the stop 120 may be disposed at other suitable locations.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
In this embodiment, the object- side surfaces 51, 61 and the image- side surfaces 52, 62 are defined according to the following aspheric curve formula:
wherein:
r is the distance from a point on the optical surface to the optical axis.
z is the rise of this point in the direction of the optical axis.
c is the curvature of the surface.
K is the conic constant of the surface.
A4、A6、A8、A10、A12、A14Respectively, the following steps: aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order, and fourteen order. For details of parameters of each aspheric surface, please refer to the following table:
| surface of | 51 | 52 | 61 | 62 |
| K | 9.693E-01 | 9.033E+00 | 0.000E+00 | 8.979E+01 |
| A4 | 1.755E-05 | 1.194E-03 | 2.151E-03 | 1.325E-03 |
| A6 | 1.662E-08 | -1.131E-05 | -1.268E-04 | -1.261E-04 |
| A8 | 1.491E-07 | 8.385E-06 | 3.399E-05 | 2.576E-05 |
| A10 | -3.290E-08 | -4.644E-07 | -3.894E-06 | -2.544E-06 |
| A12 | 1.508E-09 | -1.974E-08 | 1.761E-07 | 5.654E-08 |
| A14 | -3.165E-11 | 3.240E-09 | 0.000E+00 | 4.115E-09 |
Please refer to table 4 for the values of the conditional expressions related to this embodiment.
2-4, it can be seen that the MTF transfer function graph of the present embodiment has high resolution and high pixel, can support the requirements of a 4K-level vehicle-mounted sensor, can be used in a high-temperature and low-temperature environment, can ensure that the image is clear and not out of focus, and meets the use requirements of a temperature range specified by a vehicle-mounted lens; as shown in fig. 5, it can be seen that the relative illumination is high and the overall brightness is uniform; please refer to fig. 6 in detail, it can be seen that the chromatic aberration is optimized well and the imaging quality is high.
In this embodiment, the focal length f of the optical imaging lens is 5.48 mm; f-number FNO 1.6; field angle FOV is 98.0 °; the size IMH of the target surface is 9.3 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 35.39 mm.
Example two
As shown in fig. 7, the surface convexoconcave and the refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the object-side surface 91 of the ninth lens element 9 is a flat surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | 51 | 52 | 61 | 62 |
| K | 9.933E-01 | 8.872E+00 | 0.000E+00 | 8.107E+01 |
| A4 | 1.584E-05 | 1.220E-03 | 2.283E-03 | 1.326E-03 |
| A6 | 5.808E-07 | -1.187E-05 | -1.261E-04 | -1.383E-04 |
| A8 | 1.800E-07 | 8.246E-06 | 3.150E-05 | 2.539E-05 |
| A10 | -3.562E-08 | -4.995E-07 | -3.687E-06 | -2.429E-06 |
| A12 | 1.234E-09 | -2.509E-08 | 1.585E-07 | 5.787E-08 |
| A14 | -7.191E-12 | 3.492E-09 | 0.000E+00 | 2.441E-09 |
Please refer to table 4 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in fig. 8-10, and it can be seen that the resolution is high, the pixel is high, the requirements of a 4K-level vehicle-mounted sensor can be supported, the image can be ensured to be clear without defocusing when the system is used in a high-temperature and low-temperature environment, and the use requirements of a temperature range specified by a vehicle-mounted lens are met; referring to fig. 11 in detail with respect to the contrast graph, it can be seen that the relative illuminance is high and the overall brightness is uniform; please refer to fig. 12 in detail, it can be seen that the color difference is optimized well and the imaging quality is high.
In this embodiment, the focal length f of the optical imaging lens is 5.44 mm; f-number FNO 1.6; field angle FOV is 98.0 °; the size IMH of the target surface is 9.3 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 35.41 mm.
EXAMPLE III
As shown in fig. 13, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | 51 | 52 | 61 | 62 |
| K | 9.893E-01 | 8.825E+00 | 0.000E+00 | 8.651E+01 |
| A4 | 1.241E-05 | 1.199E-03 | 2.279E-03 | 1.387E-03 |
| A6 | 5.048E-08 | -1.236E-05 | -1.246E-04 | -1.345E-04 |
| A8 | 1.528E-07 | 8.148E-06 | 3.156E-05 | 2.514E-05 |
| A10 | -3.537E-08 | -5.151E-07 | -3.705E-06 | -2.390E-06 |
| A12 | 1.447E-09 | -2.538E-08 | 1.633E-07 | 6.341E-08 |
| A14 | -1.508E-11 | 3.633E-09 | 0.000E+00 | 2.403E-09 |
Please refer to table 4 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in fig. 14-16, and it can be seen that the resolution is high, the pixels are high, the requirements of a 4K-level vehicle-mounted sensor can be supported, the image can be ensured to be clear without defocusing when the system is used in a high-temperature and low-temperature environment, and the use requirements of a temperature range specified by a vehicle-mounted lens are met; referring to fig. 17 in detail with respect to the contrast graph, it can be seen that the relative illuminance is high and the overall brightness is uniform; please refer to fig. 18 in detail, it can be seen that the color difference is optimized well and the imaging quality is high.
In this embodiment, the focal length f of the optical imaging lens is 5.45 mm; f-number FNO 1.6; field angle FOV is 98.0 °; the size IMH of the target surface is 9.3 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 140 on the optical axis I is 35.32 mm.
Table 4 values of relevant important parameters of three embodiments of the present invention
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical imaging lens characterized in that: the optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along an optical axis; the first lens element to the eleventh lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive power has a convex image-side surface;
the tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the eleventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the fifth lens and/or the sixth lens are/is an aspheric lens, and the temperature coefficients of the refractive indexes of the eighth lens and the ninth lens are negative values;
the optical imaging lens has only the first lens element to the eleventh lens element with refractive index.
2. The optical imaging lens of claim 1, further satisfying: -1.3< f3/f4< -0.8, wherein f3 is the focal length of the third lens and f4 is the focal length of the fourth lens.
3. The optical imaging lens of claim 1, further satisfying: T1/D1 is more than or equal to 0.1, D12/R12 is more than or equal to 1.6, wherein T1 is the thickness of the first lens on the optical axis, D1 is the outer diameter of the first lens, D12 is the aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.
4. The optical imaging lens of claim 1, further satisfying: 0.8< f1/f2<1.3, wherein f1 is the focal length of the first lens and f2 is the focal length of the second lens.
5. The optical imaging lens of claim 1, further satisfying: vd2 > 50, where vd2 is the Abbe number of the second lens.
6. The optical imaging lens according to claim 1, characterized in that: the third lens and the fourth lens are mutually glued, the seventh lens and the eighth lens are mutually glued, and the ninth lens and the tenth lens are mutually glued.
7. The optical imaging lens of claim 6, further satisfying: vd8-vd7 > 30, vd9-vd10 > 30, wherein vd7 is the abbe number of the seventh lens, vd8 is the abbe number of the eighth lens, vd9 is the abbe number of the ninth lens, and vd10 is the abbe number of the tenth lens.
8. The optical imaging lens of claim 1, further satisfying: TTL/BFL is more than or equal to 9, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis; and BFL is the optical back focus of the optical imaging lens.
9. The optical imaging lens of claim 1, further satisfying: D112/IMH is more than 0.8, wherein D112 is the aperture of the image side surface of the eleventh lens, and IMH is the size of the target surface of the optical imaging lens.
10. The optical imaging lens of claim 1, further satisfying: nd11 is greater than 1.8, where nd11 is the refractive index of the eleventh lens.
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| CN202120407844.3U CN214151213U (en) | 2021-02-25 | 2021-02-25 | Optical imaging lens |
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| CN117270167A (en) * | 2023-11-23 | 2023-12-22 | 江西联益光学有限公司 | Optical lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117270167A (en) * | 2023-11-23 | 2023-12-22 | 江西联益光学有限公司 | Optical lens |
| CN117270167B (en) * | 2023-11-23 | 2024-02-20 | 江西联益光学有限公司 | Optical lens |
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