CN215895097U - Monitoring lens in short-focus vehicle carrying vehicle - Google Patents
Monitoring lens in short-focus vehicle carrying vehicle Download PDFInfo
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- CN215895097U CN215895097U CN202122382388.4U CN202122382388U CN215895097U CN 215895097 U CN215895097 U CN 215895097U CN 202122382388 U CN202122382388 U CN 202122382388U CN 215895097 U CN215895097 U CN 215895097U
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Abstract
The utility model discloses a short-focus vehicle-mounted in-vehicle monitoring lens which sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the first lens to the sixth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass; the first lens element has negative refractive index, the second lens element has negative refractive index, the third lens element has positive refractive index, the fourth lens element has negative refractive index, the fifth lens element has positive refractive index, and the sixth lens element has positive refractive index; the optical imaging lens has only the six lenses with the refractive indexes. The utility model adopts six lenses, and by correspondingly designing each lens, the lens can have good picture brightness when used in a night weak light driving environment, can ensure the imaging quality of edge pictures, and has high-definition imaging effect and higher image color reducibility.
Description
Technical Field
The utility model relates to the technical field of lenses, in particular to a short-focus vehicle-mounted in-vehicle monitoring lens.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, the optical imaging lens is also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring and the like, so that the requirement on the optical imaging lens is higher and higher. However, the monitoring lens in the current vehicle-mounted vehicle at least has the following defects:
1. the monitoring lens in the existing vehicle-mounted vehicle generally has the problems of small clear aperture, dark imaging picture and many noise points, and cannot meet the use requirement in a low-light environment at night.
2. The monitoring lens in the existing vehicle-mounted vehicle has low relative illumination of the edge of a picture due to the wide-angle design requirement.
3. The existing monitoring lens in the vehicle-mounted vehicle has low resolution and fuzzy imaging pictures.
4. The monitoring lens in the existing vehicle-mounted vehicle is difficult to meet the requirement of vehicle-mounted reliability and has short service life.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a monitoring lens in a short-focus vehicle carrier to at least solve one of the problems.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a monitoring lens in a short-focus vehicle-mounted vehicle sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the first lens to the sixth lens respectively comprise an object side surface facing the object side and allowing imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the optical imaging lens only has the six lenses with the refractive indexes, and the following conditional expressions are satisfied:
2.0＜|(f1/f)|＜3.5，1.5＜|(f2/f)|＜2.5，1.5＜|(f3/f)|＜2.1，
1.5＜|(f4/f)|＜2.0，1.5＜|(f5/f)|＜1.7，2.5＜|(f6/f)|＜3.5，
wherein f is a focal length value of the lens, and f1, f2, f3, f4, f5 and f6 are focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, respectively.
Preferably, the lens complies with the following conditional expression:
1.65＜Nd1＜1.80，1.41＜Nd2＜1.50，1.90＜Nd3＜2.10，
1.91＜Nd4＜2.12，1.50＜Nd5＜1.63，1.69＜Nd6＜1.84,
wherein Nd1 is a refractive index of the first lens, Nd2 is a refractive index of the second lens, Nd3 is a refractive index of the third lens, Nd4 is a refractive index of the fourth lens, Nd5 is a refractive index of the fifth lens, and Nd6 is a refractive index of the sixth lens.
Preferably, the lens complies with the following conditional expression:
50＜Vd1＜59，90＜Vd2＜98，25＜Vd3＜40,
16＜Vd4＜21，66＜Vd5＜72，50＜Vd6＜55，
wherein Vd1 is an abbe number of the first lens, Vd2 is an abbe number of the second lens, Vd3 is an abbe number of the third lens, Vd4 is an abbe number of the fourth lens, Vd5 is an abbe number of the fifth lens, and Vd6 is an abbe number of the sixth lens.
Preferably, the image side surface of the fourth lens and the object side surface of the fifth lens are mutually cemented, and the following conditional expression is satisfied: vd5-Vd4 > 45.
Preferably, the HK hardness of the first lens is more than or equal to 690 x 107Pa and the following conditional formula is satisfied: h1 > 1.0mm, wherein H1 is the central thickness of the first lens. Preferably, the temperature coefficient of refractive index dn/dt of the fifth lens is a negative value.
Preferably, the lens complies with the following conditional expression: TTL is less than 15mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
After adopting the technical scheme, compared with the background technology, the utility model has the following advantages:
1. the six lenses are adopted along the direction from the object side to the image side, and the lenses are correspondingly designed, so that the light passing F/2.0 of the lens is realized, the imaging edge illumination is more than 55%, the good image brightness can be ensured when the lens is used in a low-light driving environment at night, the field angle DFOV of the lens is 150 degrees, the optical F-Theta distortion is controlled within-10%, and the imaging quality of edge images is ensured.
2. The utility model matches with 1/3.8' sensor, can support 120 ten thousand pixels, has high-definition imaging effect, and clear and uniform imaging picture, simultaneously, the lens adopts 425nm-675nm visible wide spectrum design, focal shift on the axis is controlled within 13um, and the later color is controlled within 6um, thus ensuring that the picture can not have blue-violet side color difference and having higher image color reducibility.
3. The design of the first lens can meet the reliability requirements of vehicle ball falling, broken stone and the like, can prevent the first lens from being broken to influence the driving safety, meets the vehicle-mounted reliability requirement, and prolongs the service life of the vehicle-mounted monitoring lens in the vehicle.
Drawings
FIG. 1 is a light path diagram according to the first embodiment;
FIG. 2 is a graph of MTF of the lens in the first embodiment under the condition of 436nm-659nm of visible light;
FIG. 3 is a defocus graph of the lens in the first embodiment at 436nm-659nm of visible light;
FIG. 4 is a lateral aberration diagram of the lens at 546nm in the first embodiment;
FIG. 5 is a graph of chromatic aberration and focus shift of a lens according to a first embodiment;
FIG. 6 is a graph of field curvature and distortion under 436nm-659nm in the first embodiment;
FIG. 7 is a graph of relative illumination at 546nm for a lens according to one embodiment;
FIG. 8 is a light path diagram of the second embodiment;
FIG. 9 is a graph of MTF of the lens of the second embodiment in the range of 436nm to 659nm in visible light;
FIG. 10 is a defocus graph of the lens in the second embodiment at 436nm-659nm of visible light;
FIG. 11 is a lateral aberration diagram of the lens of the second embodiment under the visible light 546 nm;
FIG. 12 is a graph of chromatic aberration and focal shift of the lens according to the second embodiment;
FIG. 13 is a graph of curvature of field and distortion under 436nm-659nm in the case of a lens according to the second embodiment;
FIG. 14 is a graph of relative illumination at 546nm for the lens of the second embodiment;
FIG. 15 is a light path diagram of the third embodiment;
FIG. 16 is a graph of MTF of the lens of the third embodiment in the range of 436nm to 659nm in visible light;
FIG. 17 is a graph showing the defocus of the lens of the third embodiment in the range from 436nm to 659nm of visible light;
FIG. 18 is a lateral aberration diagram of the lens of the third embodiment under the visible light 546 nm;
FIG. 19 is a graph showing chromatic aberration and focal shift of the lens according to the third embodiment;
FIG. 20 is a graph showing the curvature of field and distortion of a lens in the third embodiment under 436nm-659nm of visible light;
FIG. 21 is a graph of relative illumination of the lens of the third embodiment in 546 nm.
Description of reference numerals:
the lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, an aperture 7 and a protective glass 8.
Detailed Description
To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The utility model will now be further described with reference to the accompanying drawings and detailed description.
In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss 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 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 a short-focus vehicle-mounted in-vehicle monitoring lens which sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the first lens to the sixth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the optical imaging lens only has the six lenses with the refractive indexes, and the following conditional expressions are satisfied:
2.0＜|(f1/f)|＜3.5，1.5＜|(f2/f)|＜2.5，1.5＜|(f3/f)|＜2.1，
1.5＜|(f4/f)|＜2.0，1.5＜|(f5/f)|＜1.7，2.5＜|(f6/f)|＜3.5，
wherein f is the focal length value of the lens, f1, f2, f3, f4, f5 and f6 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, and the optical performance of the lens can be improved by reasonably distributing the focal power.
Preferably, the lens complies with the following conditional expression:
1.65＜Nd1＜1.80，1.41＜Nd2＜1.50，1.90＜Nd3＜2.10，
1.91＜Nd4＜2.12，1.50＜Nd5＜1.63，1.69＜Nd6＜1.84,
wherein Nd1 is a refractive index of the first lens, Nd2 is a refractive index of the second lens, Nd3 is a refractive index of the third lens, Nd4 is a refractive index of the fourth lens, Nd5 is a refractive index of the fifth lens, and Nd6 is a refractive index of the sixth lens.
Preferably, the lens complies with the following conditional expression:
50＜Vd1＜59，90＜Vd2＜98，25＜Vd3＜40,
16＜Vd4＜21，66＜Vd5＜72，50＜Vd6＜55，
wherein Vd1 is an abbe number of the first lens, Vd2 is an abbe number of the second lens, Vd3 is an abbe number of the third lens, Vd4 is an abbe number of the fourth lens, Vd5 is an abbe number of the fifth lens, and Vd6 is an abbe number of the sixth lens.
Preferably, the image side surface of the fourth lens and the object side surface of the fifth lens are mutually cemented, and the following conditional expression is satisfied: vd5-Vd4 is more than 45, and the fourth lens and the fifth lens are combined by high-low dispersion materials, so that chromatic aberration can be corrected conveniently, and the system performance can be improved.
Preferably, the HK hardness of the first lens is more than or equal to 690 x 107Pa and the following conditional formula is satisfied: h1 is more than 1.0mm, wherein H1 is the central thickness of the first lens, preferably, the first lens is made of a high-hardness H-LAK5 material, and the lens is plated with a waterproof scratch-resistant film to meet the requirements of a vehicle ball drop test, a scratch-resistant test and the like.
Preferably, the temperature coefficient dn/dt of the refractive index of the fifth lens is a negative value, that is, the refractive index of the fifth lens is reduced along with the increase of the temperature, and the fifth lens can correct chromatic aberration of the lens and can offset the influence of temperature change on the back focal offset of the lens, so that when the lens is used in a temperature range of-40 ℃ to 105 ℃, the image is still clear and cannot be out of focus, and the requirements of a use environment of a vehicle gauge can be met.
Preferably, the lens complies with the following conditional expression: TTL is less than 15mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
The monitoring lens of the present invention will be described in detail with specific embodiments.
Example one
Referring to fig. 1, the present embodiment discloses a short-focus in-vehicle monitoring lens, which includes, in order along an optical axis from an object side a1 to an image side a2, a first lens element 1, a second lens element 2, a third lens element 3, a stop 7, a fourth lens element 4, a fifth lens element 5, and a sixth lens element 6, where the first lens element 1 to the sixth lens element 6 each include an object side surface facing the object side a1 and allowing passage of imaging light rays, and an image side surface facing the image side a2 and allowing passage of imaging light rays;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are concave;
the third lens element 3 has a positive refractive index, and the object-side surface and the image-side surface of the third lens element 3 are convex and convex;
the fourth lens element 4 has a negative refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are concave;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a positive refractive index, and the sixth lens element 6 has a convex object-side surface and a convex image-side surface;
the optical imaging lens has only the six lenses, the image side surface of the fourth lens element 4 and the object side surface of the fifth lens element 5 are mutually glued, and the fourth lens element 4 and the fifth lens element 5 meet the following conditional expressions: vd5-Vd4 > 45, wherein Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens.
Detailed optical data of this embodiment are shown in table 1.
Table 1 detailed optical data of example one
| Surface of | Type (B) | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | Focal length | |
| OBJ | Shot object surface | 0.000 | | Infinity | |||||
| 1 | First lens | 9.018 | 8.721 | 1.098 | H-LAK53B | 1.75500 | 52.337 | -5.339 | |
| 2 | 4.855 | 2.615 | 2.296 | ||||||
| 3 | Second lens | 4.159 | -7.587 | 0.748 | FCD100 | 1.43700 | 95.100 | -3.628 | |
| 4 | 2.903 | 2.071 | 0.551 | ||||||
| 5 | Third lens | 2.843 | 4.729 | 1.958 | TAFD65 | 2.05090 | 26.942 | 3.208 | |
| 6 | 2.026 | -9.531 | -0.001 | ||||||
| 7 | STO | 1.942 | Infinity | 0.638 | |||||
| 8 | Fourth lens | 1.980 | -51.068 | 0.609 | E-FDS2 | 2.00272 | 19.317 | -3.016 | |
| 9 | Fifth lens element | 2.275 | 3.276 | 1.551 | H-ZPK5 | 1.59280 | 68.346 | 3.020 | |
| 10 | 3.005 | -3.276 | 0.101 | ||||||
| 11 | Sixth lens element | 3.709 | 7.819 | 1.450 | H-LAK53A | 1.75500 | 52.329 | 5.652 | |
| 12 | 4.004 | -8.730 | 0.150 | ||||||
| 13 | Cover glass | 4.084 | Infinity | 0.700 | H-K9L | 1.51680 | 64.212 | Infinity | |
| 14 | 4.161 | Infinity | 2.897 | ||||||
| IMA | Image plane | 4.646 | Infinity |
In this specific embodiment, the lens is applicable to 1/3.8 "sensor, the focal length F of the optical imaging lens is 1.87mm, the DFOV is at 150 °, and the light transmission is F/2.0, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 1 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 2, which shows that when the spatial frequency of the lens reaches 133.6lp/mm, the full-field transfer function image is still larger than 30%, the center-to-edge uniformity is high, the imaging quality is excellent, and the resolution of the lens is high. Please refer to fig. 3, which shows the defocus curve of the lens under the visible light of 436nm-659nm, and it can be seen that the defocus amount of the lens under the visible light is small. Please refer to fig. 4 for a transverse aberration diagram of the lens under the visible light 546nm, and it can be seen from the diagram that the latercolor is less than 6um in the visible 436nm-659nm wide spectrum band, so as to ensure that the picture does not have blue-violet side aberration and has high image color reducibility. Please refer to fig. 5, it can be seen that focal shift is less than 13um, the chromatic aberration is small, and the color reproducibility of the image is high. Please refer to fig. 6 for the field curvature and distortion diagram of the lens under the visible light of 436nm to 659nm, it can be seen from the diagram that the optical distortion is controlled within-10%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by the later image algorithm, and the application is convenient. Referring to fig. 7, it can be seen that the relative illumination of the lens under the 546nm is greater than 55%, which ensures uniform relative illumination under high-illumination conditions, and can ensure sufficient image brightness even at night or in low-light driving environment.
Example two
As shown in fig. 8 to 14, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 2.
Table 2 detailed optical data of example two
| Surface of | Type (B) | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | Focal length | |
| OBJ | Shot object surface | 0.000 | | Infinity | |||||
| 1 | First lens | 9.112 | 9.766 | 1.100 | H-LAK52 | 1.72916 | 54.669 | -5.227 | |
| 2 | 4.851 | 2.619 | 2.312 | ||||||
| 3 | Second lens | 4.031 | -9.310 | 0.745 | FCD100 | 1.43700 | 95.100 | -3.751 | |
| 4 | 2.807 | 2.044 | 0.512 | ||||||
| 5 | Third lens | 2.745 | 4.927 | 1.833 | TAFD65 | 2.05090 | 26.942 | 3.386 | |
| 6 | 1.955 | -10.686 | 0.005 | ||||||
| 7 | STO | 1.878 | Infinity | 0.714 | |||||
| 8 | Fourth lens | 2.014 | -81.980 | 0.601 | E-FDS2 | 2.00272 | 19.317 | -3.300 | |
| 9 | Fifth lens element | 2.311 | 3.505 | 1.420 | H-ZPK5 | 1.59280 | 68.346 | 2.993 | |
| 10 | 2.944 | -3.073 | 0.101 | ||||||
| 11 | Sixth lens element | 3.611 | 8.167 | 1.385 | H-LAK53A | 1.75500 | 52.329 | 5.931 | |
| 12 | 3.903 | -9.283 | 0.150 | ||||||
| 13 | Cover glass | 3.974 | Infinity | 0.700 | H-K9L | 1.51680 | 64.212 | Infinity | |
| 14 | 4.066 | Infinity | 2.929 | ||||||
| IMA | Image plane | 4.652 | Infinity |
In this specific embodiment, the lens is applicable to 1/3.8 "sensor, the focal length F of the optical imaging lens is 1.87mm, the DFOV is at 150 °, and the light transmission is F/2.0, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 8 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 9 for the MTF graph of the lens under the visible light of 436nm to 659nm, it can be seen from the graph that when the spatial frequency of the lens reaches 133.6lp/mm, the full-field transfer function image is still larger than 30%, the center-to-edge uniformity is high, the imaging quality is excellent, and the resolution of the lens is high. Please refer to fig. 10, which shows the defocus curve of the lens under the visible light of 436nm-659nm, and it can be seen that the defocus amount of the lens under the visible light is small. Please refer to fig. 11 for a transverse aberration diagram of the lens under the visible light 546nm, and it can be seen from the diagram that the latercolor is less than 6um in the visible 436nm-659nm wide spectrum band, so as to ensure that the picture does not have blue-violet side aberration and has high image color reducibility. Please refer to fig. 12, it can be seen that focal shift is less than 13um, the chromatic aberration is small, and the color reproducibility of the image is high. Please refer to fig. 13 for the field curvature and distortion diagram of the lens under the visible light of 436nm to 659nm, it can be seen from the diagram that the optical distortion is controlled within-10%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by the later image algorithm, and the application is convenient. Referring to fig. 14, it can be seen that the relative illuminance of the lens under the visible light 546nm is greater than 55%, so that the relative illuminance under the high-light condition is uniform, and sufficient image brightness can be ensured when the lens is used at night or in a low-light driving environment.
EXAMPLE III
As shown in fig. 15 to 21, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 3.
Table 3 detailed optical data of example three
| Surface of | Type (B) | Caliber size (diameter) | Radius of curvature | Thickness of | Material of | Refractive index | Coefficient of dispersion | Focal length | |
| OBJ | Shot object surface | 0.000 | | Infinity | |||||
| 1 | First lens | 9.070 | 9.201 | 1.149 | H-LAK52 | 1.72916 | 54.669 | -5.289 | |
| 2 | 4.780 | 2.582 | 2.206 | ||||||
| 3 | Second lens | 4.002 | -10.550 | 0.525 | FCD10A | 1.45860 | 90.195 | -3.659 | |
| 4 | 2.883 | 2.033 | 0.509 | ||||||
| 5 | Third lens | 2.839 | 5.205 | 1.839 | TAFD65 | 2.05090 | 26.942 | 3.565 | |
| 6 | 2.056 | -11.290 | 0.100 | ||||||
| 7 | STO | 1.832 | Infinity | 0.540 | |||||
| 8 | Fourth lens | 1.891 | -101.031 | 1.083 | E-FDS2 | 2.00272 | 19.317 | -3.516 | |
| 9 | Fifth lens element | 2.394 | 3.719 | 1.270 | H-ZPK5 | 1.59280 | 68.346 | 3.034 | |
| 10 | 2.943 | -3.059 | 0.081 | ||||||
| 11 | Sixth lens element | 3.648 | 7.779 | 1.406 | H-LAF50B | 1.77250 | 49.614 | 5.588 | |
| 12 | 3.940 | -9.031 | 2.108 | ||||||
| 13 | Cover glass | 4.381 | Infinity | 0.700 | H-K9L | 1.51680 | 64.212 | Infinity | |
| 14 | 4.468 | Infinity | 1.000 | ||||||
| IMA | Image plane | 4.658 | Infinity |
In this specific embodiment, the lens is applicable to 1/3.8 "sensor, the focal length F of the optical imaging lens is 1.87mm, the DFOV is at 150 °, and the light transmission is F/2.0, and the lens has the advantages of large light transmission, compact structure, strong practicability and the like.
Fig. 15 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 16, which shows that when the spatial frequency of the lens reaches 133.6lp/mm, the full-field transfer function image is still larger than 30%, the center-to-edge uniformity is high, the imaging quality is excellent, and the resolution of the lens is high. Please refer to fig. 17, which shows the defocus curve of the lens under the visible light of 436nm-659nm, and it can be seen that the defocus amount of the lens under the visible light is small. Please refer to fig. 18 for a transverse aberration diagram of the lens under the visible light 546nm, and it can be seen from the diagram that the latercolor is less than 6um in the visible 436nm-659nm wide spectrum band, so as to ensure that the picture does not have blue-violet side aberration and has high image color reducibility. Please refer to fig. 19, it can be seen that focal shift is less than 13um, the chromatic aberration is small, and the color reproducibility of the image is high. Please refer to fig. 20 for the field curvature and distortion diagram of the lens under the visible light of 436nm to 659nm, it can be seen from the diagram that the optical distortion is controlled within-10%, the wide-angle distortion is strictly controlled, the image quality is improved, the distortion is not required to be corrected by the later image algorithm, and the application is convenient. Referring to fig. 21, it can be seen that the relative illumination of the lens under the visible light 546nm is greater than 55%, which ensures uniform relative illumination under high-light conditions, and can also ensure sufficient image brightness when used at night or in a low-light driving environment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The short-focus vehicle-mounted monitoring lens is characterized by comprising a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along an optical axis, wherein the first lens to the sixth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element has negative refractive index, and has a concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the optical imaging lens only has the six lenses with the refractive indexes, and the following conditional expressions are satisfied:
2.0＜|(f1/f)|＜3.5，1.5＜|(f2/f)|＜2.5，1.5＜|(f3/f)|＜2.1，
1.5＜|(f4/f)|＜2.0，1.5＜|(f5/f)|＜1.7，2.5＜|(f6/f)|＜3.5，
wherein f is a focal length value of the lens, and f1, f2, f3, f4, f5 and f6 are focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, respectively.
2. The short-focus vehicle-mounted monitoring lens according to claim 1, wherein the following conditional expressions are satisfied:
1.65＜Nd1＜1.80，1.41＜Nd2＜1.50，1.90＜Nd3＜2.10，
1.91＜Nd4＜2.12，1.50＜Nd5＜1.63，1.69＜Nd6＜1.84,
wherein Nd1 is a refractive index of the first lens, Nd2 is a refractive index of the second lens, Nd3 is a refractive index of the third lens, Nd4 is a refractive index of the fourth lens, Nd5 is a refractive index of the fifth lens, and Nd6 is a refractive index of the sixth lens.
3. The short-focus vehicle-mounted monitoring lens according to claim 1, wherein the following conditional expressions are satisfied:
50＜Vd1＜59，90＜Vd2＜98，25＜Vd3＜40,
16＜Vd4＜21，66＜Vd5＜72，50＜Vd6＜55，
wherein Vd1 is an abbe number of the first lens, Vd2 is an abbe number of the second lens, Vd3 is an abbe number of the third lens, Vd4 is an abbe number of the fourth lens, Vd5 is an abbe number of the fifth lens, and Vd6 is an abbe number of the sixth lens.
4. The short-focus vehicle-mounted monitoring lens as claimed in claim 3, wherein the image side surface of the fourth lens and the object side surface of the fifth lens are mutually glued, and the following conditional expressions are satisfied: vd5-Vd4 > 45.
5. The short-focus vehicle-mounted monitoring lens according to claim 1, wherein HK hardness of the first lens is more than or equal to 690 x 107Pa and the following conditional formula is satisfied: h1 > 1.0mm, wherein H1 is the central thickness of the first lens.
6. The short-focus vehicular monitoring lens according to claim 1, wherein the temperature coefficient of refractive index dn/dt of the fifth lens is negative.
7. The short-focus vehicle-mounted monitoring lens according to claim 1, wherein the following conditional expressions are satisfied: TTL is less than 15mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
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