CN217085400U - Monitoring lens in car - Google Patents
Monitoring lens in car Download PDFInfo
- Publication number
- CN217085400U CN217085400U CN202221024582.3U CN202221024582U CN217085400U CN 217085400 U CN217085400 U CN 217085400U CN 202221024582 U CN202221024582 U CN 202221024582U CN 217085400 U CN217085400 U CN 217085400U
- Authority
- CN
- China
- Prior art keywords
- lens
- monitoring
- vehicle
- equal
- refers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model provides a monitoring lens in a vehicle, which is provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a light filter, protective glass and an image plane I MA in sequence along the incident direction of an optical axis, wherein the first lens has negative focal power, the object side surface of the first lens is a concave surface or a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens 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 has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the monitoring lens in the vehicle has the advantages of simple structure, small volume, simple assembly and low cost, can not only achieve the resolution of 200 ten thousand pixels and ensure the normal work of clear imaging in high and low temperature environments, but also enlarge the monitoring range of the monitoring lens in the vehicle, can monitor the state of a driver more accurately and improve the driving safety.
Description
Technical Field
The utility model relates to an optical imaging technical field, concretely relates to in-vehicle monitoring camera.
Background
With the rapid development and wide application of intelligent driving assistance systems, the requirements for a lens for monitoring the automobile condition and the driving state of a driver are continuously increased. In order to improve the capture of the facial expression state of a driver and provide instant and accurate fatigue driving warning, a new requirement is provided for clear imaging of the monitoring lens in the vehicle, the view field angle of the existing monitoring lens in the vehicle is smaller, the monitoring range of the monitoring lens in the vehicle is smaller, a blind area exists in a monitoring area, the head size of the monitoring lens in the vehicle is larger, the assembly is more complex, the cost is increased, and the existing monitoring lens in the vehicle has the problems of poor temperature stability, low image resolution and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an in-car monitoring camera, its simple structure, this in-car monitoring camera volume is less, and the assembly is simple, and the cost is lower, not only can reach 200 ten thousand pixel resolution powers and guarantee in high low temperature environment that clear formation of image normally works, but has more enlarged this in-car monitoring camera monitoring range for the security of vehicle in driving process has obtained the improvement.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a monitoring lens in a vehicle is provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a light filter, a protective glass and an image plane IMA in sequence along the incident direction of an optical axis,
the first lens has negative focal power, the object side surface of the first lens is a concave surface or a convex surface, and the image side surface of the first lens is 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 convex surface;
the third lens 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 has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
and the full field angle of the monitoring lens in the vehicle is more than or equal to 70 degrees.
The utility model provides a monitoring camera lens in car, its simple structure, this monitoring camera lens volume in car is less, and the assembly is simple, and the cost is lower, not only can reach 200 ten thousand pixel resolutions and guarantee in high low temperature environment clear formation of image normal work, but has more enlarged this monitoring camera lens monitoring range in car for the security of vehicle in driving process has obtained the improvement.
As a preferred technical solution, the maximum field angle FOV of the in-vehicle monitoring lens, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens, and the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the in-vehicle monitoring lens satisfy the following condition:
2.5≤FOV/h/D≤2.8。
as a preferable technical solution, the first lens satisfies Nd1<1.7, Vd1>50, wherein Nd1 refers to the refractive index of the first lens, and Vd1 refers to the abbe number of the first lens;
the second lens satisfies Nd2>1.8, Vd2<35, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens;
the third lens satisfies Nd3>1.6, Vd3<45, wherein Nd3 refers to the refractive index of the third lens, and Vd3 refers to the Abbe number of the third lens;
the fourth lens satisfies Nd4>1.85, Vd4 <35, wherein Nd4 refers to the refractive index of the fourth lens, and Vd4 refers to the Abbe number of the fourth lens;
the fifth lens satisfies Nd5>1.8, Vd5 <45, wherein Nd5 refers to the refractive index of the fifth lens, and Vd5 refers to the Abbe number of the fifth lens.
Preferably, the third lens satisfies the following condition: dn/dt3>5X10 -6 And DEG C, wherein dn/dt3 refers to the temperature coefficient of refractive index of the third lens.
As a preferred technical scheme, the in-vehicle monitoring lens meets the following conditions: BFL/TTL is more than 0.4, wherein BFL is the distance between the center of the image side surface of the fifth lens and the imaging surface of the monitoring lens in the vehicle 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 monitoring lens in the vehicle on the optical axis.
As a preferred technical solution, the following conditions are satisfied among the maximum field angle FOV of the in-vehicle monitoring lens, the entire group of focal length values f of the in-vehicle monitoring lens, and the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens:
55≤(FOV×f)/h≤60。
as a preferred technical scheme, the in-vehicle monitoring lens meets the following conditions: f1/f is more than or equal to 1.25 and less than or equal to-0.85, f2/f is more than or equal to 0.75 and less than or equal to 0.85, f3/f is more than or equal to 1.15 and less than or equal to-0.9, f4/f is more than or equal to 0.95 and less than or equal to 1.05, and f5/f is more than or equal to 2.0 and less than or equal to 2.7, wherein f1, f2, f3, f4 and f5 are focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens in sequence, and f is a focal length value of the whole group of the monitoring lens in the automobile.
Preferably, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.
Preferably, a diaphragm is disposed between the second lens and the third lens.
The utility model also provides an in-car monitoring camera is applied to vehicle driving as supplementary safe driving monitoring camera.
The utility model provides a monitoring camera in car has following beneficial effect:
1) the utility model provides an in-car monitoring camera, its simple structure, this in-car monitoring camera volume is less, and the assembly is simple, and the cost is lower, not only can reach 200 ten thousand pixel resolutions and guarantee in high low temperature environment clear formation of image normal work, but has more enlarged this in-car monitoring camera monitoring range for the security of vehicle in driving process has obtained the improvement.
2) The utility model provides an in-car monitoring camera adopts 5 glass sphere lenses, its simple structure, and the resolution power is high, and is small, with low costs, and this in-car monitoring camera can be in-40 to 105 temperature environment, to the clear imaging monitoring of driver's driving state.
Drawings
Fig. 1 is a structural diagram of an in-vehicle monitoring lens provided in embodiment 1 (an object side is at the leftmost position, and an image side is at the rightmost position);
fig. 2 is a structural diagram of the monitoring lens in the vehicle provided in embodiment 2 (an object side is at the leftmost position, and an image side is at the rightmost position);
fig. 3 is a structural diagram of the monitoring lens in the vehicle provided in embodiment 3 (the object side is at the leftmost position, and the image side is at the rightmost position);
wherein, 1-a first lens; 2-a second lens; 3-a third lens; 4-a fourth lens; 5-a fifth lens; 6-an optical filter; 7-protective glass; 8-image plane IMA; 9-diaphragm.
Detailed Description
It should be noted that, the terms "first", "second", "third", "fourth" and "fifth" are used to limit the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, should not be construed as limiting the scope of the present invention.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It can be understood that the present invention is achieved by some embodiments.
Example 1
As shown in fig. 1, the present invention provides an in-vehicle monitoring lens, which comprises a first lens 1, a second lens 2, a diaphragm 9, a third lens 3, a fourth lens 4, a fifth lens 5, a light filter 6, a protective glass 7 and an image plane IMA8 sequentially arranged along an incident direction of an optical axis,
the first lens 1 has negative 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, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens 3 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 4 has positive focal power, and the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens 5 has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the first lens 1 has negative focal power, so that light rays can be collected, and the size of the head can be reduced; the second lens 2 is a biconvex lens and has positive focal power, can bear light rays and reduce system aberration; the third lens 3 has negative focal power, and can reduce the sensitivity of the lens for the system to refract light and improve the temperature stability of the lens; the fourth lens 4 has positive focal power and can bear light rays to reduce the sensitivity of the lens; the fifth lens is a double-convex positive lens with 5 convex lenses, so that light collection is facilitated, and the imaging quality of the system is improved.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are all glass spherical lenses.
The full view field angle of the in-vehicle monitoring lens is 70 degrees, so that the in-vehicle monitoring lens has a larger view field angle and a larger monitoring range. The optical parameters of the in-vehicle monitoring lens provided in embodiment 1 are as follows:
table 1 optical parameters of in-vehicle monitoring lens provided in embodiment 1
Table 1 shows a basic parameter table of the in-vehicle monitoring lens of example 1, in which when curvature radii of a Stop (STO), a filter (IR), a Cover Glass (CG) surface, and an image plane IMA are all Infinity, the surfaces are represented as planes, and R values and thickness/interval units are all millimeters (mm).
From table 1, we can observe that the first lens 1 satisfies Nd1<1.7，Vd1>50, wherein Nd1 refers to the refractive index of the first lens 1, and Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies Nd2>1.8，Vd2<35, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the abbe number of the second lens 2; the third lens 3 satisfies Nd3>1.6，Vd3<45, where Nd3 refers to the refractive index of the third lens 3, Vd3 refers to the abbe number of the third lens 3; the fourth lens 4 satisfies Nd4>1.85, Vd4 <35, wherein Nd4 refers to the refractive index of the fourth lens 4, and Vd4 refers to the abbe number of the fourth lens 4; the fifth lens 5 satisfies Nd5>1.8, Vd5 <45, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5; the third lens 3 satisfies dn/dt3>5X10 -6 The temperature coefficient of the refractive index of the third lens 3 is dn/dt3, the materials of the second lens 2 and the third lens 3 are matched by adopting a material with a higher refractive index, so that the sensitivity of each lens of the monitoring lens in the vehicle can be effectively reduced, better temperature stability is ensured, and the monitoring lens in the vehicle can clearly image and monitor the driving state of a driver in a-40-degree temperature environment. The experimental data of the in-vehicle monitoring lens provided in the embodiment 1 are as follows 1-1:
table 1-1 experimental data of in-vehicle monitoring lens provided in embodiment 1
| Conditional formula (II) | Example 1 |
| f | 4.98 |
| TTL | 12.8 |
| BFL | 5.44 |
| h | 3.092 |
| D | 4.1 |
| FOV | 35.3 |
| BFL/TTL | 0.43 |
| (FOV*f)/h | 56.85 |
| FOV/H/D | 2.78 |
| f1/f | -0.9 |
| f2/f | 0.76 |
| f3/f | -1.1 |
| f4/f | 1.04 |
| f5/f | 2.32 |
From table 1-1, it can be observed that the maximum field angle FOV of the in-vehicle monitoring lens is 35.3, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens is 3.092, the maximum clear aperture D of the object-side surface of the first lens 1 corresponding to the maximum field angle of the in-vehicle monitoring lens is 4.1, and FOV/h/D is 2.78, which satisfies the relationship among FOV/h/D not less than 2.5 and not more than 2.8, and the relationship among the three parameters FOV, h and D is reasonably controlled, thereby facilitating the reduction of the front end aperture of the optical lens and realizing the miniaturization of the optical lens.
From table 1-1, we can observe that the distance BFL on the optical axis from the center of the image-side surface of the fifth lens element 5 to the imaging surface of the in-vehicle monitoring lens is 5.44, the distance TTL on the optical axis from the center of the object-side surface of the first lens element 1 to the imaging surface of the in-vehicle monitoring lens is 12.8, and BFL/TTL is 0.425, and the following conditions are satisfied: BFL/TTL is more than 0.4, wherein BFL is the distance from the center of the image side surface of the fifth lens 5 to the imaging surface of the monitoring lens in the vehicle on the optical axis; and TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the monitoring lens in the vehicle on the optical axis, and further BFL/TTL is more than 0.4, so that the optical back focus of the lens can be increased, and a sufficient space is reserved for the module.
From table 1-1, we can observe that the maximum field angle FOV of the in-vehicle monitoring lens is 35.3, the entire group focal length value f of the in-vehicle monitoring lens is 4.98, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens is 3.092, (FOV × f)/h is 56.85, and the following conditions are satisfied: the FOV xf/h is more than or equal to 55 and less than or equal to 60, and the three indexes are controlled, so that the lens distortion is reduced in the redesign process.
From table 1-1, we can observe that f1/f ≦ -0.9, satisfying-1.25 ≦ f1/f ≦ -0.85; f2/f is 0.76, and f2/f is more than or equal to 0.75 and less than or equal to 0.85; f3/f is-1.1, which satisfies-1.15 is not less than f3/f is not less than-0.9; f4/f is 1.04, f4/f is not less than 0.95 and not more than 1.05, f5/f is 2.32, f5/f is not less than 2.0 and not more than 2.7, and the in-vehicle monitoring lens meets the following conditions: f1/f is more than or equal to 1.25 and less than or equal to-0.85, f2/f is more than or equal to 0.75 and less than or equal to 0.85, f3/f is more than or equal to 1.15 and less than or equal to-0.9, f4/f is more than or equal to 0.95 and less than or equal to 1.05, and f5/f is more than or equal to 2.0 and less than or equal to 2.7, wherein f1, f2, f3, f4 and f5 are focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 in sequence, and f is a focal length value of the whole group of the monitoring lens in the vehicle; by reasonably matching the focal length of the lens, the assembly sensitivity is favorably reduced, and the assembly yield of the lens is improved.
The monitoring lens in car that this embodiment provided, its simple structure, this monitoring lens volume in car is less, and the assembly is simple, and the cost is lower, not only can reach 200 ten thousand pixel resolutions and guarantee in high low temperature environment clear formation of image normal work, but has more enlarged this monitoring lens monitoring range in car for the security of vehicle in driving process has obtained the improvement.
Example 2
As shown in fig. 2, the present invention provides an in-vehicle monitoring lens, which comprises a first lens 1, a second lens 2, a diaphragm 9, a third lens 3, a fourth lens 4, a fifth lens 5, a light filter 6, a protective glass 7 and an image plane IMA8 sequentially arranged along an incident direction of an optical axis,
the first lens 1 has negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;
the second lens 2 has positive focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens 3 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 4 has positive focal power, and the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens 5 has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the first lens 1 has negative focal power, so that light rays can be collected, and the size of the head can be reduced; the second lens 2 is a biconvex lens and has positive focal power, can bear light rays and reduce system aberration; the third lens 3 has negative focal power, and can reduce the sensitivity of the lens for refracting light rays of the system and improve the temperature stability of the lens; the fourth lens 4 has positive focal power and can bear light rays to reduce the sensitivity of the lens; the fifth lens 5 is a biconvex positive lens, which is beneficial to collecting light and improving the imaging quality of the system.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are all glass spherical lenses.
The full field angle of the in-vehicle monitoring lens is 72 degrees, so that the in-vehicle monitoring lens has a larger field angle and a larger monitoring range. The optical parameters of the in-vehicle monitoring lens provided in embodiment 2 are as follows:
table 2 optical parameters of in-vehicle monitoring lens provided in embodiment 2
Table 2 shows a basic parameter table of the in-vehicle monitoring lens of example 2, in which when curvature radii of the Stop (STO), the filter (IR), the Cover Glass (CG) surface, and the image plane IMA are all Infinity, this surface is represented as a plane, and R values and thickness/interval units are all millimeters (mm).
From table 2, we can observe that the first lens 1 satisfies Nd1<1.7，Vd1>50, wherein Nd1 refers to the refractive index of the first lens 1, and Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies Nd2>1.8，Vd2<35, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the abbe number of the second lens 2; the third lens 3 satisfies Nd3>1.6，Vd3<45, where Nd3 refers to the refractive index of the third lens 3, Vd3 refers to the abbe number of the third lens 3; the fourth lens 4 satisfies Nd4>1.85, Vd4 <35, wherein Nd4 refers to the refractive index of the fourth lens 4, and Vd4 refers to the fourth lensAbbe number of mirror 4; the fifth lens 5 satisfies Nd5>1.8, Vd5 <45, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5; the third lens 3 satisfies dn/dt3>5X10 -6 The temperature coefficient of the refractive index of the third lens 3 is dn/dt3, the materials of the second lens 2 and the third lens 3 are matched by adopting a material with a higher refractive index, so that the sensitivity of each lens of the monitoring lens in the vehicle can be effectively reduced, better temperature stability is ensured, and the monitoring lens in the vehicle can clearly image and monitor the driving state of a driver in a temperature environment of 105 degrees. The experimental data of the in-vehicle monitoring lens provided in the embodiment 2 are as follows:
table 2-1 experimental data of in-vehicle monitoring lens provided in embodiment 2
| Conditional formula (II) | Example 2 |
| f | 4.92 |
| TTL | 11.76 |
| BFL | 5.21 |
| h | 3.104 |
| D | 4.4 |
| FOV | 35 |
| BFL/TTL | 0.44 |
| (FOV*f)/h | 55.48 |
| FOV/H/D | 2.56 |
| f1/f | -1.02 |
| f2/f | 0.77 |
| f3/f | -0.97 |
| f4/f | 0.97 |
| f5/f | 2.00 |
From table 2-1, it can be observed that the maximum field angle FOV of the in-vehicle monitoring lens is 35, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens is 3.104, the maximum clear aperture D of the object-side surface of the first lens 1 corresponding to the maximum field angle of the in-vehicle monitoring lens is 4.4, and FOV/h/D is 2.56, which satisfies the relationship among FOV/h/D not less than 2.5 and not more than 2.8, and reasonably controls the interrelation among the parameters FOV, h, and D, thereby facilitating the reduction of the front end aperture of the optical lens and realizing the miniaturization of the optical lens.
From table 2-1, we can observe that the distance BFL on the optical axis from the center of the image-side surface of the fifth lens element 5 to the image plane of the in-vehicle monitoring lens is 5.21, the distance TTL on the optical axis from the center of the object-side surface of the first lens element 1 to the image plane of the in-vehicle monitoring lens is 11.76, and BFL/TTL is 0.44, which satisfies the following conditions: BFL/TTL is more than 0.4, wherein BFL is the distance from the center of the image side surface of the fifth lens 5 to the imaging surface of the monitoring lens in the vehicle on the optical axis; and TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the monitoring lens in the vehicle on the optical axis, and further BFL/TTL is more than 0.4, so that the optical back focus of the lens can be increased, and a sufficient space is reserved for the module.
From table 2-1, we can observe that the maximum field angle FOV of the in-vehicle monitoring lens is 35, the entire group focal length value f of the in-vehicle monitoring lens is 4.92, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens is 3.104, (FOV × f)/h is 55.48, and the following conditions are satisfied: the FOV xf/h is more than or equal to 55 and less than or equal to 60, and the three indexes are controlled, so that the lens distortion is reduced in the redesign process.
From table 2-1, we can observe that f1/f is-1.02, satisfying-1.25 ≦ f1/f ≦ -0.85; f2/f is 0.77, and f2/f is more than or equal to 0.75 and less than or equal to 0.85; f3/f is-0.97, which satisfies-1.15 ≤ f3/f ≤ 0.9; f4/f is 0.97, f4/f is not less than 0.95 and not more than 1.05, f5/f is 2.00, and f5/f is not less than 2.0 and not more than 2.7, and the in-vehicle monitoring lens meets the following conditions: f1/f is more than or equal to 1.25 and less than or equal to-0.85, f2/f is more than or equal to 0.75 and less than or equal to 0.85, f3/f is more than or equal to 1.15 and less than or equal to-0.9, f4/f is more than or equal to 0.95 and less than or equal to 1.05, and f5/f is more than or equal to 2.0 and less than or equal to 2.7, wherein f1, f2, f3, f4 and f5 are focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 in sequence, and f is a focal length value of the whole group of the monitoring lens in the vehicle; by reasonably matching the focal length of the lens, the assembly sensitivity is favorably reduced, and the assembly yield of the lens is improved.
The monitoring lens in car that this embodiment provided, its simple structure, this monitoring lens volume in car is less, and the assembly is simple, and the cost is lower, not only can reach 200 ten thousand pixel resolutions and guarantee in high low temperature environment clear formation of image normal work, but has more enlarged this monitoring lens monitoring range in car for the security of vehicle in driving process has obtained the improvement.
Example 3
As shown in fig. 3, the present invention provides a monitoring lens in a vehicle, which comprises a first lens 1, a second lens 2, a diaphragm 9, a third lens 3, a fourth lens 4, a fifth lens 5, a light filter 6, a protective glass 7 and an image plane IMA8 sequentially arranged along an incident direction of an optical axis,
the first lens 1 has negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;
the second lens 2 has positive focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens 3 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 4 has positive focal power, and the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens 5 has positive focal power, and the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the first lens 1 has negative focal power, so that light rays can be collected conveniently, and the size of the head is reduced; the second lens 2 is a biconvex lens and has positive focal power, can bear light rays and reduce system aberration; the third lens 3 has negative focal power, and can reduce the sensitivity of the lens for refracting light rays of the system and improve the temperature stability of the lens; the fourth lens 4 has positive focal power and can bear light rays to reduce the sensitivity of the lens; the fifth lens 5 is a biconvex positive lens, which is beneficial to collecting light and improving the imaging quality of the system.
The first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are all glass spherical lenses.
The full field angle of the in-vehicle monitoring lens is 75 degrees, so that the in-vehicle monitoring lens has a larger field angle and a larger monitoring range. The optical parameters of the in-vehicle monitoring lens provided in embodiment 3 are as follows:
table 3 optical parameters of in-vehicle monitoring lens provided in embodiment 3
Table 3 shows a basic parameter table of the in-vehicle monitoring lens of example 3, in which when the radii of curvature of the Stop (STO), the filter (IR), the Cover Glass (CG) surface, and the image plane IMA are all Infinity, this surface is represented as a plane, and the R value and the thickness/interval are all in units of millimeters (mm).
From table 3, we can observe that the first lens 1 satisfies Nd1<1.7，Vd1>50, wherein Nd1 refers to the refractive index of the first lens, Vd1 refers to the abbe number of the first lens 1; the second lens 2 satisfies Nd2>1.8，Vd2<35, wherein Nd2 refers to the refractive index of the second lens 2, and Vd2 refers to the abbe number of the second lens 2; the third lens 3 satisfies Nd3>1.6，Vd3<45, where Nd3 refers to the refractive index of the third lens 3, Vd3 refers to the abbe number of the third lens 3; the fourth lens 4 satisfies Nd4>1.85, Vd4 <35, wherein Nd4 refers to the refractive index of the fourth lens 4, and Vd4 refers to the abbe number of the fourth lens 4; the fifth lens 5 satisfies Nd5>1.8, Vd5 <45, wherein Nd5 refers to the refractive index of the fifth lens 5, and Vd5 refers to the Abbe number of the fifth lens 5; the third lens 3 satisfies dn/dt3>5X10 -6 The temperature coefficient of the refractive index of the third lens 3 is dn/dt3, the materials of the second lens 2 and the third lens 3 are matched by adopting a material with a higher refractive index, so that the sensitivity of each lens of the monitoring lens in the vehicle can be effectively reduced, better temperature stability is ensured, and the monitoring lens in the vehicle can clearly image and monitor the driving state of a driver in a temperature environment of 105 degrees. The experimental data of the in-vehicle monitoring lens provided in the embodiment 3 are as follows in table 3-1:
table 3-1 experimental data of in-vehicle monitoring lens provided in embodiment 3
From table 3-1, it can be observed that the maximum field angle FOV of the in-vehicle monitoring lens is 35, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens is 3.06, the maximum clear aperture D of the object-side surface of the first lens 1 corresponding to the maximum field angle of the in-vehicle monitoring lens is 4.3, FOV/h/D is 2.66, which satisfies that FOV/h/D is not less than 2.5 and not more than 2.8, and the interrelation among the three parameters FOV, h and D is reasonably controlled, which is beneficial to reducing the front end aperture of the optical lens and realizing miniaturization of the optical lens.
From table 3-1, we can observe that the distance BFL on the optical axis from the center of the image-side surface of the fifth lens element 5 to the image plane of the in-vehicle monitoring lens is 5.68, the distance TTL on the optical axis from the center of the object-side surface of the first lens element 1 to the image plane of the in-vehicle monitoring lens is 12.94, and BFL/TTL is 0.44, which satisfies the following conditions: BFL/TTL is more than 0.4, wherein BFL is the distance from the center of the image side surface of the fifth lens 5 to the imaging surface of the monitoring lens in the vehicle on the optical axis; and the TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the monitoring lens in the vehicle on the optical axis, and further the BFL/TTL is more than 0.4, so that the optical back focus of the lens can be increased, and a sufficient space is reserved for the module.
From table 3-1, we can observe that the maximum field angle FOV of the in-vehicle monitoring lens is 35, the entire group focal length value f of the in-vehicle monitoring lens is 4.98, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens is 3.06, (FOV × f)/h is 56.96, and the following conditions are satisfied: the FOV multiplied by f/h is more than or equal to 55 and less than or equal to 60, and the three indexes are controlled, thereby being beneficial to reducing the lens distortion in the redesign process.
From table 3-1, we can observe that f1/f is-0.88, satisfying-1.25 ≦ f1/f ≦ -0.85; f2/f is 0.76, and f2/f is more than or equal to 0.75 and less than or equal to 0.85; f3/f is-1.01, and satisfies the condition that the ratio of f3/f is more than or equal to-1.15 and less than or equal to-0.9; f4/f is 1.01, f4/f is more than or equal to 0.95 and less than or equal to 1.05, f5/f is 2.31, f5/f is more than or equal to 2.0 and less than or equal to 2.7, and the in-vehicle monitoring lens meets the following conditions: f1/f is more than or equal to 1.25 and less than or equal to-0.85, f2/f is more than or equal to 0.75 and less than or equal to 0.85, f3/f is more than or equal to 1.15 and less than or equal to-0.9, f4/f is more than or equal to 0.95 and less than or equal to 1.05, and f5/f is more than or equal to 2.0 and less than or equal to 2.7, wherein f1, f2, f3, f4 and f5 are focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 in sequence, and f is a focal length value of the whole group of the monitoring lens in the vehicle; by reasonably matching the focal length of the lens, the assembly sensitivity is favorably reduced, and the assembly yield of the lens is improved.
The monitoring lens in car that this embodiment provided, its simple structure, this monitoring lens volume in car is less, and the assembly is simple, and the cost is lower, not only can reach 200 ten thousand pixel resolutions and guarantee in high low temperature environment clear formation of image normal work, but has more enlarged this monitoring lens monitoring range in car for the security of vehicle in driving process has obtained the improvement.
The in-vehicle monitoring lens provided by the embodiment 1-3 is applied to vehicle driving as an auxiliary safe driving monitoring lens, can clearly image in an extreme temperature environment, and further enlarges the monitoring range of the in-vehicle monitoring lens, so that the safety of a vehicle in the driving process is improved.
It is to be understood that the present invention has been described with respect to certain embodiments and that various changes in the features and embodiments, and equivalents thereof, may be substituted for elements thereof without departing from the spirit and scope of the invention as defined by the appended claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not to be limited to the specific embodiments disclosed herein, and all modifications and equivalents that fall within the scope of the claims of the present application are intended to be embraced therein. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.
Claims (9)
1. A monitoring lens in a vehicle is characterized in that a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a light filter, a protective glass and an image plane IMA are sequentially arranged along the incident direction of an optical axis,
the first lens has negative focal power, the object side surface of the first lens is a concave surface or a convex surface, and the image side surface of the first lens is 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 convex surface;
the third lens 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 has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
and the full field angle of the monitoring lens in the vehicle is more than or equal to 70 degrees.
2. The in-vehicle monitoring lens according to claim 1, wherein the maximum field angle FOV of the in-vehicle monitoring lens, the image height h corresponding to the maximum field angle of the in-vehicle monitoring lens, and the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the in-vehicle monitoring lens satisfy the following condition:
2.5≤FOV/h/D≤2.8。
3. the in-vehicle monitoring lens according to claim 1, wherein the first lens satisfies Nd1<1.7, Vd1>50, where Nd1 refers to a refractive index of the first lens and Vd1 refers to an abbe number of the first lens;
the second lens satisfies Nd2>1.8, Vd2<35, wherein Nd2 refers to the refractive index of the second lens, and Vd2 refers to the Abbe number of the second lens;
the third lens satisfies Nd3>1.6, Vd3<45, wherein Nd3 refers to the refractive index of the third lens, and Vd3 refers to the Abbe number of the third lens;
the fourth lens satisfies Nd4>1.85, Vd4 <35, wherein Nd4 refers to the refractive index of the fourth lens, and Vd4 refers to the Abbe number of the fourth lens;
the fifth lens satisfies Nd5>1.8, Vd5 <45, wherein Nd5 refers to the refractive index of the fifth lens, and Vd5 refers to the Abbe number of the fifth lens.
4. The in-vehicle monitoring lens according to claim 3, wherein the third lens satisfies the following condition: dn/dt3>5X10 -6 And DEG C, wherein dn/dt3 refers to the temperature coefficient of refractive index of the third lens.
5. The in-vehicle monitoring lens according to claim 1, wherein the in-vehicle monitoring lens satisfies the following condition: BFL/TTL is more than 0.4, wherein BFL is the distance between the center of the image side surface of the fifth lens and the imaging surface of the monitoring lens in the vehicle 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 monitoring lens in the vehicle on the optical axis.
6. The in-vehicle monitoring lens according to claim 1, wherein the following condition is satisfied among a maximum view field angle FOV of the in-vehicle monitoring lens, a whole set of focal length values f of the in-vehicle monitoring lens, and an image height h corresponding to the maximum view field angle of the in-vehicle monitoring lens:
55≤(FOV×f)/h≤60。
7. the in-vehicle monitoring lens according to claim 1, wherein the in-vehicle monitoring lens satisfies the following conditions: f1/f is more than or equal to 1.25 and less than or equal to-0.85, f2/f is more than or equal to 0.75 and less than or equal to 0.85, f3/f is more than or equal to 1.15 and less than or equal to-0.9, f4/f is more than or equal to 0.95 and less than or equal to 1.05, and f5/f is more than or equal to 2.0 and less than or equal to 2.7, wherein f1, f2, f3, f4 and f5 are focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens in sequence, and f is a focal length value of the whole group of the monitoring lens in the automobile.
8. The in-vehicle monitoring lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.
9. The in-vehicle monitoring lens according to claim 1, wherein a diaphragm is disposed between the second lens and the third lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221024582.3U CN217085400U (en) | 2022-04-29 | 2022-04-29 | Monitoring lens in car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221024582.3U CN217085400U (en) | 2022-04-29 | 2022-04-29 | Monitoring lens in car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217085400U true CN217085400U (en) | 2022-07-29 |
Family
ID=82502983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221024582.3U Active CN217085400U (en) | 2022-04-29 | 2022-04-29 | Monitoring lens in car |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217085400U (en) |
-
2022
- 2022-04-29 CN CN202221024582.3U patent/CN217085400U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9261674B2 (en) | Wide-angle imaging lens and imaging apparatus | |
| CN114114643A (en) | High definition car looks sideways at optical lens and imaging device | |
| CN113156611A (en) | Optical lens and imaging apparatus | |
| JP2018116076A (en) | Image capturing lens and image capturing device | |
| CN114660781A (en) | Small fisheye lens with high resolution and application thereof | |
| CN114114634B (en) | Optical system, camera module and car | |
| CN113835201B (en) | Optical system, camera module and electronic equipment | |
| CN111258028A (en) | Optical system, camera module, electronic device and automobile | |
| CN218446163U (en) | High definition car looks sideways at optical lens and imaging device | |
| CN114624854A (en) | Optical lens and electronic device | |
| CN115826200A (en) | Low-cost high-definition vehicle-mounted front-view lens and application thereof | |
| CN217085400U (en) | Monitoring lens in car | |
| CN216210197U (en) | Large-aperture optical lens | |
| CN114326025A (en) | All-round looking optical lens and imaging device | |
| CN212410951U (en) | High-resolution large-visual-angle vehicle-mounted fisheye optical lens and vehicle-mounted all-around-view lens | |
| CN113406774A (en) | Vehicle-mounted front-view lens | |
| CN218446162U (en) | All-round looking optical lens and imaging device | |
| CN114791661B (en) | Vehicle-mounted monitoring lens and application thereof | |
| CN220509201U (en) | Optical lens | |
| US20230350171A1 (en) | Imaging lens system and camera | |
| CN115166948B (en) | Low-cost glass-plastic hybrid monitoring lens and electronic equipment | |
| CN217085399U (en) | Small fisheye lens with high resolution | |
| CN216248531U (en) | High-definition vehicle-mounted lens | |
| CN220626761U (en) | Vehicle-mounted looking-around optical system and camera module | |
| CN114488480B (en) | Optical system, camera module and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |