CN216210197U - Large-aperture optical lens - Google Patents
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- CN216210197U CN216210197U CN202122960857.6U CN202122960857U CN216210197U CN 216210197 U CN216210197 U CN 216210197U CN 202122960857 U CN202122960857 U CN 202122960857U CN 216210197 U CN216210197 U CN 216210197U
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Abstract
The utility model provides a large-aperture optical lens, comprising: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a parallel flat plate and an image plane I MA (image plane MA) which are arranged in sequence along the incident direction of an optical axis, wherein the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface or a concave surface; the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative focal power, the object side surface of the third lens is a convex surface or a concave surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the F index of the large-aperture optical lens is less than 1.8, the F index is equal to the ratio of the focal length F of the large-aperture optical lens to the entrance pupil aperture D, and the resolution of the large-aperture optical lens is more than 25 ten thousand pixels; the technical problems of low resolution and small aperture of the optical lens are solved, and the cost of the optical lens is reduced.
Description
Technical Field
The utility model relates to the technical field of optical lenses, in particular to a large-aperture optical lens.
Background
In recent years, with the development of automobile automatic driving, the degree of intelligence of automobile automatic driving is increasing, and the laser radar lens is also becoming an important component in an automobile automatic driving system as an automobile eye-aware surrounding environment. The vehicle-mounted computer can find the obstacles in front of the vehicle according to the perception of the laser radar to the driving environment, avoid the obstacles in time and avoid accidents.
However, the resolution of surrounding images obtained by the traditional mechanical and semi-solid laser radars is low, details of human environments cannot be clearly distinguished, the current solid laser radar lens has a small aperture and cannot be seen too far, the driving auxiliary system cannot accurately judge information of a front vehicle in real time so as to make timely early warning or avoidance, driving risks exist, and the cost of the solid laser radar lens is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides an optical lens with a large aperture, which solves the technical problems of low resolution and small aperture of the optical lens and reduces the cost of the optical lens.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides a large-aperture optical lens, comprising: a first lens, a second lens, a third lens, a fourth lens, a parallel flat plate and an image plane IMA are arranged along the incident direction of an optical axis in sequence,
the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface or a concave surface;
the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has negative focal power, the object side surface of the third lens is a convex surface or a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the F index of the large-aperture optical lens is smaller than 1.8, the F index is equal to the ratio of the focal length F of the large-aperture optical lens to the entrance pupil diameter D, and the resolution of the large-aperture optical lens is larger than 25 ten thousand pixels.
The utility model provides an optical lens with a large aperture, which solves the technical problems of low resolution and small aperture of the optical lens and reduces the cost of the optical lens.
Preferably, the first lens, the second lens, the third lens and the fourth lens are all spherical lenses.
Preferably, the first lens Nd1 is more than 1.55, and Vd1 is more than 45; wherein, the Nd1 is the optical refractive index of the first lens, and the Vd1 is the Abbe constant of the first lens;
the second lens Nd2 is more than 1.55, and Vd2 is more than 45, wherein the Nd2 is the optical refractive index of the second lens, and the Vd2 is the Abbe constant of the second lens;
the third lens Nd3 is more than 1.8, Vd3 is less than 40, wherein the Nd3 is the optical refractive index of the third lens, and the Vd3 is the Abbe constant of the third lens;
the fourth lens Nd4 is more than 1.8, Vd4 is less than 40, wherein the Nd4 is the optical refractive index of the fourth lens, and the Vd4 is the Abbe constant of the fourth lens.
As a preferred technical scheme, the first lens meets the requirement that dn/dt1 < -1X10-6And DEG C, wherein dn/dt1 refers to the temperature coefficient of the refractive index of the first lens.
As a preferred technical scheme, the second lens meets the requirement that dn/dt2 < -1X10-6And DEG C, wherein dn/dt2 refers to the temperature coefficient of the refractive index of the second lens.
As a preferred technical solution, the large aperture optical lens satisfies the condition: BFL/TTL is more than 0.15, wherein BFL is the distance from the center of the image side surface of a fourth lens on the large aperture optical lens to the imaging surface of the large aperture optical lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the large-aperture optical lens on the optical axis.
As a preferred technical solution, the following conditions are satisfied among the maximum field angle FOV of the large-aperture optical lens, the entire group of focal length values f of the large-aperture optical lens, and the image height h corresponding to the maximum field angle of the large-aperture optical lens: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6.
As a preferred technical solution, the large aperture optical lens satisfies the conditional expression: f1/f is more than or equal to 1.3 and less than or equal to 1.8, f2/f is more than or equal to 1.0 and less than or equal to 1.5, f3/f is more than or equal to 0.25 and less than or equal to-0.2, and f4/f is more than or equal to 0.28 and less than or equal to 0.32, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
Preferably, a diaphragm is disposed between the second lens and the third lens.
The utility model provides a large-aperture optical lens, which adopts a structure of 4 glass spherical lenses, has simple structure, good processability, high resolution, small distortion and large aperture, reduces the cost, and realizes clear imaging and normal work of the large-aperture optical lens within the range of-40-105 degrees.
Drawings
Fig. 1 is a structural diagram of an optical lens with a large aperture according to embodiment 1 of the present invention;
fig. 2 is a field curvature distortion diagram of a large aperture optical lens according to embodiment 1 of the present invention;
fig. 3 is a structural diagram of an optical lens with a large aperture according to embodiment 2 of the present invention;
fig. 4 is a field curvature distortion diagram of a large aperture optical lens according to embodiment 2 of the present invention;
fig. 5 is a structural diagram of an optical lens with a large aperture according to embodiment 3 of the present invention;
fig. 6 is a field curvature distortion diagram of a large aperture optical lens according to embodiment 3 of the present invention;
wherein: 1-a first lens; 2-a second lens; 3-a diaphragm; 4-a third lens; 5-a fourth lens; 6-parallel plates; 7-image plane IMA.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It is understood that the utility model achieves the objects of the utility model by means of some embodiments.
Example 1
As shown in fig. 1, the present invention provides a large aperture optical lens, comprising: a first lens 1, a second lens 2, a third lens 4, a fourth lens 5, a parallel flat plate 6 and an image plane IMA7 are sequentially arranged along the incident direction of an optical axis;
the first lens 1 has positive focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface;
the second lens 2 has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens 4 has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens 5 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the F index of the large-aperture optical lens is 1.78, the F index is equal to the ratio of the focal length F of the lens to the entrance pupil aperture D, and the resolution of the large-aperture optical lens is 26 ten thousand pixels;
a diaphragm 3 is arranged between the second lens 2 and the third lens 4;
f1/f is 1.6, f2/f is 1.35, f3/f is-0.23, f4/f is 0.30, and the large-aperture optical lens satisfies the following conditional expression: f1/f is more than or equal to 1.3 and less than or equal to 1.8, f2/f is more than or equal to 1.0 and less than or equal to 1.5, f3/f is more than or equal to 0.25 and less than or equal to-0.2, and f4/f is more than or equal to 0.28 and less than or equal to 0.32, wherein f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 4, and f4 is the focal length of the fourth lens 5.
The first lens 1 has positive focal power, the image side surface of the first lens 1 is a convex surface or a concave surface, the first lens 1 is in a meniscus shape, and the first lens 1 is beneficial to collecting light rays and reducing distortion; the second lens 2 has positive focal power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, and the second lens 2 bends to the diaphragm, so that the second lens is beneficial to smoothly carrying light rays, reducing aberration, reducing the sensitivity of the lens and simultaneously being beneficial to reducing the caliber of the lens; the third lens 4 has negative focal power, and is beneficial to folding light rays to correct field curvature; the fourth lens element 5 has positive focal power, which is beneficial to reducing aberration and improving imaging quality, and the optical parameters of the large-aperture optical lens provided in embodiment 1 are as follows in table 1:
table 1 shows the optical parameters of the large aperture optical lens provided in this embodiment 1
As can be observed from table 1, the first lens 1, the second lens 2, the third lens 4 and the fourth lens 5 are all spherical lenses; the first lens 1 satisfies Nd 1-1.59 and Vd 1-68.3, wherein the Nd1 is the optical refractive index of the first lens 1, and the Vd1 is the Abbe constant of the first lens 1; the second lens 2 satisfies the following condition: nd2 is 1.59, and Vd2 is 67.3, wherein Nd2 is the optical refractive index of the second lens 2, and Vd2 is the abbe constant of the second lens 2; the third lens 4 satisfies the following condition: nd3 is 1.85, and Vd3 is 32.3, wherein Nd3 is the optical refractive index of the third lens 4, and Vd3 is the abbe constant of the third lens 4; the fourth lens 5 satisfies the following condition: nd4 is 1.85, and Vd4 is 23.8, wherein Nd4 is the optical refractive index of the fourth lens 5, and Vd4 is the abbe constant of the fourth lens 5; the parallel plate 6 satisfies the following conditions: nd5 is 1.52, and Vd5 is 64.2, wherein Nd5 is the optical refractive index of the parallel flat plate, and Vd5 is the abbe constant of the parallel flat plate 6.
The measurement parameters of the large-aperture optical lens provided by the embodiment are shown in the following table 1.1:
TABLE 1.1 measurement parameters of the large aperture optical lens provided in this example
Substituting the measurement parameters of the large-aperture optical lens provided in this embodiment in table 1.1 into a formula BFL/TTL of 0.1832, where BFL is a distance on the optical axis from the center of the image-side surface of the fourth lens 5 along the incident direction of the optical axis to the imaging surface of the large-aperture optical lens; TTL is the distance on the optical axis from the center of the object-side surface of the first lens element 1 to the imaging surface of the large-aperture optical lens; the large-aperture optical lens in the embodiment meets the condition that BFL/TTL is more than 0.15, and is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
Substituting the measurement parameters of the large-aperture optical lens provided by this embodiment in table 1.1 into the formula (FOV × f)/h as 55.2356, where the maximum field angle FOV of the large-aperture optical lens, the entire group of focal length values f of the large-aperture optical lens, and the image height h corresponding to the maximum field angle of the large-aperture optical lens provided by this embodiment satisfy: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6; controlling the maximum field angle FOV of the large-aperture optical lens, the whole group of focal length values f of the large-aperture optical lens and the image height h corresponding to the maximum field angle of the large-aperture optical lens to meet the following requirements: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6, which is beneficial to reducing the lens distortion.
As shown in fig. 2, a field curvature distortion diagram of a large aperture optical lens according to embodiment 1 of the present invention is provided, where the left diagram is a field curvature graph, the ordinate of the field curvature diagram is a field angle, the abscissa is a distance between an image point and a paraxial image plane, T represents a meridional field curvature, S represents a sagittal field curvature, and the field curvature curve shows a distance between a current focal plane or image plane as a field coordinate function and the paraxial focal plane, and is divided into a meridional field curvature and a sagittal field curvature. The right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, the similarity degree of the object image is reflected, the optical distortion of the large-aperture optical lens in the embodiment is small, and the image is clear.
Example 2
As shown in fig. 3, the present invention provides a large aperture optical lens, comprising: a first lens 1, a second lens 2, a third lens 4, a fourth lens 5, a parallel flat plate 6 and an image plane IMA7 are arranged in sequence along the incident direction of an optical axis,
the first lens 1 has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens 2 has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens 4 has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens 5 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the F index of the large-aperture optical lens is 1.75, the F index is equal to the ratio of the focal length F of the large-aperture optical lens to the entrance pupil diameter D, and the resolution of the large-aperture optical lens is 28 ten thousand pixels.
A diaphragm 3 is arranged between the second lens 2 and the third lens 4;
f1/f is 1.7, f2/f is 1.40, f3/f is-0.21, f4/f is 0.31, and the large-aperture optical lens satisfies the following conditional expression: f1/f is more than or equal to 1.3 and less than or equal to 1.8, f2/f is more than or equal to 1.0 and less than or equal to 1.5, f3/f is more than or equal to 0.25 and less than or equal to-0.2, and f4/f is more than or equal to 0.28 and less than or equal to 0.32, wherein f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 4, and f4 is the focal length of the fourth lens 5.
The first lens 1 has positive focal power, the image side surface of the first lens is a convex surface or a concave surface, and the first lens 1 is in a meniscus shape, so that light rays can be collected conveniently, and distortion is reduced; the second lens 2 has positive focal power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, the second lens 2 is in a meniscus shape and is bent to a diaphragm, light receiving is smooth, aberration is reduced, lens sensitivity is reduced, and the lens caliber is reduced; the third lens 4 has negative focal power, and is beneficial to folding light rays to correct field curvature; the fourth lens element 5 has positive focal power, which is beneficial to reducing aberration and improving imaging quality, and the optical parameters of the large-aperture optical lens provided in embodiment 2 are as follows:
table 2 shows the optical parameters of the large aperture optical lens provided in this embodiment 2
| Surface type | R value | Thickness/spacing | Optical refractive index (Nd) | Abbe constant (Vd) | |
| S1 | Spherical surface | 20.993 | 2.982 | 1.56 | 69.2 |
| S2 | Spherical surface | 90.385 | 3.239 | ||
| S3 | Spherical surface | 14.035 | 4.502 | 1.56 | 68.3 |
| S4 | Spherical surface | 48.629 | 0.532 | ||
| S5 | Diaphragm | Infinity | 5.774 | ||
| S6 | Spherical surface | -37.685 | 6.523 | 1.89 | 30.0 |
| S7 | Spherical surface | 6.315 | 2.940 | ||
| S8 | Spherical surface | 10.632 | 2.934 | 1.87 | 23.9 |
| S9 | Spherical surface | -25.821 | 0.5 | ||
| S10 | Spherical surface | Infinity | 0.7 | 1.52 | 64.2 |
| S14 | Spherical surface | Infinity | 4.298 | ||
| S15 | Spherical surface | Infinity |
As can be observed from table 2, the first lens 1, the second lens 2, the third lens 4 and the fourth lens 5 are all spherical lenses; the first lens 1 satisfies Nd 1-1.56 and Vd 1-69.2, wherein the Nd1 is the optical refractive index of the first lens 1, and the Vd1 is the Abbe constant of the first lens; the second lens 2 satisfies the following condition: nd2 is 1.56, and Vd2 is 68.3, wherein Nd2 is the optical refractive index of the second lens 2, and Vd2 is the abbe constant of the second lens; the third lens 4 satisfies the following condition: nd3 is 1.89, and Vd3 is 30.0, wherein the Nd3 is the optical refractive index of the third lens, and the Vd3 is the abbe constant of the third lens; the fourth lens 5 satisfies the following condition: nd4 is 1.87, and Vd4 is 23.9, wherein Nd4 is the optical refractive index of the fourth lens, and Vd4 is the abbe constant of the fourth lens; the parallel plate 6 satisfies the following conditions: nd5 is 1.52, and Vd5 is 64.2, wherein Nd5 is the optical refractive index of the parallel plate 6, and Vd5 is the abbe constant of the parallel plate 6. The measurement parameters of the large-aperture optical lens provided by the embodiment are shown in the following table 2.1:
TABLE 2.1 measurement parameters of the large aperture optical lens provided in this embodiment
Substituting the measurement parameters of the large-aperture optical lens provided in this embodiment of table 2.1 into a formula BFL/TTL of 0.2320, where BFL is a distance on the optical axis from the center of the image-side surface of the fourth lens 5 along the incident direction of the optical axis to the imaging surface of the large-aperture optical lens; TTL is the distance on the optical axis from the center of the object-side surface of the first lens element 1 to the imaging surface of the large-aperture optical lens; the large-aperture optical lens in the embodiment meets the condition that BFL/TTL is more than 0.15, and is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
Substituting the measurement parameters of the large-aperture optical lens provided by this embodiment in table 2.1 into the formula (FOV × f)/h as 55.9873, where the maximum field angle FOV of the large-aperture optical lens, the entire group of focal length values f of the large-aperture optical lens, and the image height h corresponding to the maximum field angle of the large-aperture optical lens provided by this embodiment satisfy: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6; controlling the maximum field angle FOV of the large-aperture optical lens, the whole group of focal length values f of the large-aperture optical lens and the image height h corresponding to the maximum field angle of the large-aperture optical lens to meet the following requirements: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6, which is beneficial to reducing the lens distortion.
As shown in fig. 4, a field curvature distortion diagram of a large aperture optical lens according to embodiment 2 of the present invention is provided, where the left diagram is a field curvature graph, the ordinate of the field curvature diagram is a field angle, the abscissa is a distance between an image point and a paraxial image plane, T represents a meridional field curvature, S represents a sagittal field curvature, and the field curvature curve shows a distance between a current focal plane or an image plane as a function of the field coordinate and the paraxial focal plane, and is divided into a meridional field curvature and a sagittal field curvature. The right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, the similarity degree of the object image is reflected, the optical distortion of the large-aperture optical lens in the embodiment is small, and the image is clear.
Example 3
As shown in fig. 5, the present invention provides a large aperture optical lens, comprising: a first lens 1, a second lens 2, a third lens 4, a fourth lens 5, a parallel flat plate 6 and an image plane I MA7 are arranged in sequence along the incident direction of an optical axis,
the first lens 1 has positive focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface;
the second lens 2 has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens 4 has negative focal power, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens 5 has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the F index of the large-aperture optical lens is 1.6, the F index is equal to the ratio of the focal length F of the large-aperture optical lens to the entrance pupil diameter D, and the resolution of the large-aperture optical lens is 32 ten thousand pixels.
A diaphragm 3 is arranged between the second lens 2 and the third lens 4;
f1/f is 1.75, f2/f is 1.43, f3/f is-0.21, f4/f is 0.29, and the large-aperture optical lens satisfies the following conditional expression: f1/f is more than or equal to 1.3 and less than or equal to 1.8, f2/f is more than or equal to 1.0 and less than or equal to 1.5, f3/f is more than or equal to 0.25 and less than or equal to-0.2, and f4/f is more than or equal to 0.28 and less than or equal to 0.32, wherein f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 4, and f4 is the focal length of the fourth lens 5.
The first lens 1 has positive focal power, the image side surface of the first lens is a convex surface or a concave surface, and the first lens 1 is in a meniscus shape, so that light rays can be collected conveniently, and distortion is reduced; the second lens 2 has positive focal power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, the second lens 2 is in a meniscus shape and is bent to a diaphragm, light receiving is smooth, aberration is reduced, lens sensitivity is reduced, and the lens caliber is reduced; the third lens 4 has negative focal power, and is beneficial to folding light rays to correct field curvature; the fourth lens element 5 has positive focal power, which is beneficial to reducing aberration and improving imaging quality, and the optical parameters of the large aperture optical lens provided in embodiment 3 are as follows in table 3:
table 3 shows the optical parameters of the large aperture optical lens provided in this embodiment 3
| Surface type | R value | Thickness/spacing | Optical refractive index (Nd) | Abbe constant (Vd) | |
| S1 | Spherical surface | 27.861 | 3.52 | 1.57 | 68.6 |
| S2 | Spherical surface | -94.51 | 2.776 | ||
| S3 | Spherical surface | 10.993 | 2.943 | 1.58 | 66.7 |
| S4 | Spherical surface | 25.576 | 1.812 | ||
| S5 | Diaphragm | Infinity | 2.569 | ||
| S6 | Spherical surface | 149.52 | 6.51 | 1.87 | 31.3 |
| S7 | Spherical surface | 4.99 | 6.017 | ||
| S8 | Spherical surface | 19.957 | 3.495 | 1.88 | 23.6 |
| S9 | Spherical surface | -12.764 | 0.5 | ||
| S10 | Spherical surface | Infinity | 0.7 | 1.52 | 64.2 |
| S14 | Spherical surface | Infinity | 4.17 | ||
| S15 | Spherical surface | Infinity |
As can be observed from table 3, the first lens 1, the second lens 2, the third lens 4 and the fourth lens 5 are all spherical lenses; the first lens 1 satisfies Nd 1-1.57 and Vd 1-68.6, wherein the Nd1 is the optical refractive index of the first lens 1, and the Vd1 is the Abbe constant of the first lens; the second lens 2 satisfies the following condition: nd 2-1.58 and Vd 2-66.7, wherein the Nd2 is the optical refractive index of the second lens 2, and the Vd2 is the abbe constant of the second lens; the third lens 4 satisfies the following condition: nd3 is 1.87, and Vd3 is 31.3, wherein Nd3 is the optical refractive index of the third lens, and Vd3 is the abbe constant of the third lens; the fourth lens 5 satisfies the following condition: nd4 is 1.88, and Vd4 is 23.6, wherein Nd4 is the optical refractive index of the fourth lens, and Vd4 is the abbe constant of the fourth lens; the parallel plate 6 satisfies the following conditions: nd5 is 1.52, and Vd5 is 64.2, wherein Nd5 is the optical refractive index of the parallel flat plate, and Vd5 is the abbe constant of the parallel flat plate.
The measurement parameters of the large-aperture optical lens provided by the embodiment are shown in the following table 3.1:
TABLE 3.1 measurement parameters of the large aperture optical lens provided in this embodiment
Substituting the measurement parameters of the large-aperture optical lens provided in this embodiment of table 3.1 into a formula BFL/TTL of 0.2345, where BFL is a distance on the optical axis from the center of the image-side surface of the fourth lens 5 along the incident direction of the optical axis to the imaging surface of the large-aperture optical lens; TTL is the distance on the optical axis from the center of the object-side surface of the first lens element 1 to the imaging surface of the large-aperture optical lens; the large-aperture optical lens in the embodiment meets the condition that BFL/TTL is more than 0.15, and is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
Substituting the measurement parameters of the large-aperture optical lens provided by this embodiment in table 3.1 into the formula (FOV × f)/h as 57.5047, the maximum field angle FOV of the large-aperture optical lens, the entire group of focal length values f of the large-aperture optical lens, and the image height h corresponding to the maximum field angle of the large-aperture optical lens provided by this embodiment satisfy: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6; controlling the maximum field angle FOV of the large-aperture optical lens, the whole group of focal length values f of the large-aperture optical lens and the image height h corresponding to the maximum field angle of the large-aperture optical lens to meet the following requirements: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6, which is beneficial to reducing the lens distortion.
As shown in fig. 6, a field curvature distortion diagram of a large aperture optical lens according to embodiment 3 of the present invention is provided, where the left diagram is a field curvature graph, the ordinate of the field curvature diagram is a field angle, the abscissa is a distance between an image point and a paraxial image plane, T represents a meridional field curvature, S represents a sagittal field curvature, and the field curvature curve shows a distance between a current focal plane or an image plane as a function of the field coordinate and the paraxial focal plane, and is divided into a meridional field curvature and a sagittal field curvature. The right image is a distortion curve graph, the ordinate of the distortion graph is the angle of view, the abscissa is the distortion percentage, the distortion belongs to the principal ray aberration, the similarity degree of the object image is reflected, the optical distortion of the large-aperture optical lens in the embodiment is small, and the image is clear.
The utility model provides a large-aperture optical lens, which adopts a structure of 4 glass spherical lenses, has simple structure, good processability, high resolution, small distortion and large aperture, reduces the cost, and realizes clear imaging and normal work of the large-aperture optical lens within the range of-40-105 degrees.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all modifications and equivalents falling within the scope of the appended claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A large aperture optical lens, comprising: a first lens, a second lens, a third lens, a fourth lens, a parallel flat plate and an image plane IMA are arranged along the incident direction of an optical axis in sequence,
the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface or a concave surface;
the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has negative focal power, the object side surface of the third lens is a convex surface or a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the F index of the large-aperture optical lens is smaller than 1.8, the F index is equal to the ratio of the focal length F of the large-aperture optical lens to the entrance pupil diameter D, and the resolution of the large-aperture optical lens is larger than 25 ten thousand pixels.
2. The large aperture optical lens of claim 1, wherein the first lens, the second lens, the third lens and the fourth lens are all spherical lenses.
3. The large-aperture optical lens according to claim 1, wherein the first lens Nd1 > 1.55, Vd1 > 45; wherein, the Nd1 is the optical refractive index of the first lens, and the Vd1 is the Abbe constant of the first lens;
the second lens Nd2 is more than 1.55, and Vd2 is more than 45, wherein the Nd2 is the optical refractive index of the second lens, and the Vd2 is the Abbe constant of the second lens;
the third lens Nd3 is more than 1.8, Vd3 is less than 40, wherein the Nd3 is the optical refractive index of the third lens, and the Vd3 is the Abbe constant of the third lens;
the fourth lens Nd4 is more than 1.8, Vd4 is less than 40, wherein the Nd4 is the optical refractive index of the fourth lens, and the Vd4 is the Abbe constant of the fourth lens.
4. The large aperture optical lens of claim 1, wherein the first lens satisfies dn/dt1 < -1X10-6And DEG C, wherein dn/dt1 refers to the temperature coefficient of the refractive index of the first lens.
5. The large aperture optical lens of claim 1, wherein the second lens satisfies dn/dt2 < -1X10-6And DEG C, wherein dn/dt2 refers to the temperature coefficient of the refractive index of the second lens.
6. The large aperture optical lens of claim 1, wherein the large aperture optical lens satisfies the condition: BFL/TTL is more than 0.15, wherein BFL is the distance from the center of the image side surface of a fourth lens on the large aperture optical lens to the imaging surface of the large aperture optical lens on the optical axis; and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the large-aperture optical lens on the optical axis.
7. The large-aperture optical lens according to claim 1, wherein the following conditions are satisfied among the maximum field angle FOV of the large-aperture optical lens, the entire group of focal length values f of the large-aperture optical lens, and the image height h corresponding to the maximum field angle h of the large-aperture optical lens: the FOV xf/h is more than or equal to 55.6 and less than or equal to 57.6.
8. The large-aperture optical lens according to claim 1, wherein the large-aperture optical lens satisfies the conditional expression: f1/f is more than or equal to 1.3 and less than or equal to 1.8, f2/f is more than or equal to 1.0 and less than or equal to 1.5, f3/f is more than or equal to 0.25 and less than or equal to-0.2, and f4/f is more than or equal to 0.28 and less than or equal to 0.32, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
9. The large aperture optical lens of claim 1, wherein a stop is disposed between the second lens and the third lens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024016663A1 (en) * | 2022-07-18 | 2024-01-25 | 歌尔光学科技有限公司 | Optical system and augmented reality device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024016663A1 (en) * | 2022-07-18 | 2024-01-25 | 歌尔光学科技有限公司 | Optical system and augmented reality device |
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