CN212873050U - Vehicle-mounted optical lens - Google Patents
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- CN212873050U CN212873050U CN202022117254.5U CN202022117254U CN212873050U CN 212873050 U CN212873050 U CN 212873050U CN 202022117254 U CN202022117254 U CN 202022117254U CN 212873050 U CN212873050 U CN 212873050U
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Abstract
The utility model provides an on-vehicle optical lens, it has the high resolution, big light ring, and the advantage at big visual angle includes by thing side to image side along the optical axis in proper order: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that: the first lens 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is any one of a convex surface and a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex 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 fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface or a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface while the image side surface of the sixth lens is a concave surface.
Description
Technical Field
The utility model relates to an optical imaging technology field is applicable to car foresight system and autopilot field, specifically is an on-vehicle optical lens.
Background
In recent years, with the development of vehicle-mounted technology, there has been an increasing demand for forward-looking cameras, automatic cruise cameras, automobile data recorders, and vehicle-mounted cameras. The front-view vehicle-mounted lens is an important component in an advanced driver assistance system, and a driver can find out obstacles in front of the vehicle through the front-view vehicle-mounted lens, so that driving accidents are avoided.
However, the conventional forward-looking camera lens has low image resolution and small field depth range, cannot realize shooting in a large angle range while presenting remote details, cannot enable a driving assistance system to accurately judge the environmental information around the vehicle in real time so as to make timely early warning or evasion, and has driving risks.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides an on-vehicle optical lens, it has the high resolution, big light ring, the advantage at big visual angle.
The technical scheme is as follows: an on-vehicle optical lens includes, in order from an object side to an image side along an optical axis: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that:
the first lens 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is any one of a convex surface and a concave surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex 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 fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is any one of a concave surface and a convex surface;
the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
wherein, the following relation is satisfied:
the conditional expression is satisfied: f1/f is more than or equal to-2.8 and less than or equal to-0.8, f2/f is more than or equal to 6.3 and less than or equal to 10.3,
0.7≤f3/f≤2.7,0.1≤f4/f≤2.1,-0.5≤f5/f≤-1.5,1.5≤f6/f≤3.5,
f1, f2, f3, f4, f5 and f6 are focal length values of the first lens to the sixth lens in sequence, and f is a focal length value of the whole group of the vehicle-mounted optical lens.
The diaphragm is arranged between the third lens and the fourth lens, the optical filter is arranged on the image plane side of the sixth lens, and the protective glass is arranged on the image plane side of the optical filter.
Furthermore, the first lens, the second lens and the sixth lens are glass aspheric lenses respectively, and the third lens, the fourth lens and the fifth lens are glass spherical lenses.
Further, the fourth lens and the fifth lens are cemented with each other to form a cemented lens set.
Further, the fourth lens and the fifth lens are separate lenses.
Further, the difference between abbe numbers V1 and V2 of at least two adjacent lenses of the vehicle-mounted optical lens satisfies: 20 < | V1-V2| < 50, where V1 represents the Abbe number of one of the lenses and V2 represents the Abbe number of the other adjacent lens.
Further, the vehicle-mounted optical lens meets the following conditions: the BFL/TTL is less than or equal to 0.3,
the BFL is the distance from the center of the image side surface of the last lens of the vehicle-mounted optical lens to the imaging surface of the vehicle-mounted optical lens on the optical axis; TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the vehicle-mounted optical lens.
Further, the vehicle-mounted optical lens meets the following conditions: the FOV/h/d is less than or equal to 2.5,
wherein the FOV is the maximum field angle of the vehicle-mounted optical lens; d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the vehicle-mounted optical lens; and h is the image height corresponding to the maximum field angle of the vehicle-mounted optical lens.
Further, the maximum field angle FOV of the vehicle-mounted optical lens, the entire group of focal length values f of the vehicle-mounted optical lens, and the image height h corresponding to the maximum field angle of the vehicle-mounted optical lens satisfy: (FOV xf)/h is not less than 60.
Further, the vehicle-mounted optical lens satisfies the conditional expression: TTL/f is less than or equal to 7.
Wherein, TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the vehicle-mounted optical lens, and f is a focal length value of the entire group of the vehicle-mounted optical lens.
The vehicle-mounted optical lens only uses six lenses, the structure is compact, the number of the lenses is small, the whole volume of the lens is effectively reduced, the structure of each lens is reasonably designed, and the parameters such as positive and negative focal power distribution, the gluing state, the refractive index, the Abbe coefficient and the like of the lens are optimized, so that the vehicle-mounted optical lens can realize clear imaging in a range of-40 degrees to 125 degrees, the temperature drift is small, the imaging requirement of 800 ten thousand pixels is met, the aperture is large, the range of a photographable field of view is 120 degrees, and the vehicle-mounted optical lens is superior to most vehicle-mounted optical lens products on the market.
Drawings
Fig. 1 is a structural combination diagram of the vehicular optical lens of the present invention;
FIG. 2 is a MTF graph of an in-vehicle optical lens in an embodiment;
fig. 3 is a defocus graph of the on-vehicle optical lens in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides an on-vehicle optical lens includes by thing side to image side along the optical axis in proper order: the lens system comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a sixth lens 6, wherein the fourth lens 4 and the fifth lens 5 are mutually glued to form a group of glued lenses, specifically:
the first lens element has negative power, and has a convex object-side surface S1 and a concave image-side surface S2;
the second lens has positive focal power, and the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface S5, and the image side surface S6 is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface S8, and the image side surface of the fourth lens is a convex surface;
the fifth lens element has negative power, and has a concave object-side surface S9 and a concave image-side surface S10;
the sixth lens element has positive power, and has a convex object-side surface S11 and a concave image-side surface S12;
wherein, the following relation is satisfied:
the conditional expression is satisfied: f1/f is more than or equal to-2.8 and less than or equal to-0.8, f2/f is more than or equal to 6.3 and less than or equal to 10.3,
0.7≤f3/f≤2.7,0.1≤f4/f≤2.1,-0.5≤f5/f≤-1.5,1.5≤f6/f≤3.5,
f1, f2, f3, f4, f5 and f6 are focal length values of the first lens to the sixth lens in sequence, and f is a focal length value of the whole group of the vehicle-mounted optical lens.
In the embodiment, the vehicle-mounted optical lens can realize clear imaging in a range of-40 degrees to 125 degrees, has small temperature drift, meets the imaging requirement of 800 ten thousand pixels, has a large aperture and a large visual angle, has a shooting visual field range of 120 degrees, and is superior to most vehicle-mounted optical lens products on the market.
In order to further optimize the performance of the optical lens, the vehicle-mounted optical lens of the embodiment further includes a diaphragm 7, a filter 8, and a protective glass 9, the diaphragm 7 is disposed between the third lens 3 and the fourth lens 4, the filter 8 is disposed on the image plane side of the sixth lens 6, the filter 8 mainly functions to filter interference of an infrared band on an image, the protective glass 9 is disposed on the image plane side of the filter 8, and the protective glass 9 mainly functions to protect the image sensor.
In this embodiment, the first lens 1, the second lens 2, and the sixth lens 6 are glass aspheric lenses, the third lens 3, the fourth lens 4, and the fifth lens 5 are glass spherical lenses, and a full glass architecture is adopted, so that the system has more stable thermal performance in a high-temperature and low-temperature use environment, and the safety of automatic driving is greatly improved. Therefore, the optical lens according to the above embodiment of the present application can better meet the requirements of, for example, vehicle-mounted applications, and by adopting the aspheric lens design, the molded image is effectively corrected, the problem of distortion of the field of view and the like is solved, and meanwhile, the lens is lighter, thinner and flatter.
In the embodiment, the fourth lens 4 and the fifth lens 5 are mutually cemented to form a group of cemented lenses, so that the system chromatic aberration can be reduced; of course, in other embodiments of the present invention, the fourth lens 4 and the fifth lens 5 may be separate lenses.
In this embodiment, the difference between abbe numbers V1 and V2 of at least two adjacent lenses of the vehicle-mounted optical lens satisfies: 20 < | V1-V2| < 50, wherein V1 represents the Abbe number of one of the lenses and V2 represents the Abbe number of the other adjacent lens, specifically:
the first lens 1 also satisfies the following condition: nd1 is more than 1.7 and less than 1.9, and Vd1 is more than 40 and less than 50; wherein Nd1 is the optical refractive index of the first lens, and Vd1 is the Abbe constant of the first lens;
the second lens 2 also satisfies the following condition: nd2 is more than 1.7 and less than 1.9, and Vd2 is more than 40 and less than 50; wherein Nd2 is the optical refractive index of the second lens, and Vd2 is the Abbe constant of the second lens;
the third lens 3 also satisfies the following condition: nd3 is more than 1.6 and less than 1.8, and Vd3 is more than 40 and less than 60; wherein Nd3 is the optical refractive index of the third lens, and Vd3 is the Abbe constant of the third lens;
the fourth lens 4 also satisfies the following condition: nd4 is more than 1.5 and less than 1.7, and Vd4 is more than 60 and less than 70; wherein Nd4 is the optical refractive index of the fourth lens, and Vd4 is the Abbe constant of the fourth lens;
the fifth lens 5 also satisfies the following condition: nd5 is more than 1.7 and less than 1.9, Vd5 is more than 20 and less than 30; wherein Nd5 is the optical refractive index of the fifth lens, and Vd5 is the Abbe constant of the fifth lens;
the sixth lens 6 also satisfies the following condition: nd6 is more than 1.6 and less than 1.8, and Vd6 is more than 50 and less than 70; wherein Nd6 is the optical refractive index of the sixth lens, and Vd6 is the abbe constant of the sixth lens.
In addition, in the present embodiment, the on-vehicle optical lens satisfies the condition:
BFL/TTL≤0.3
the BFL is the distance from the center of the image side surface of the last lens of the vehicle-mounted optical lens to the imaging surface of the vehicle-mounted optical lens on the optical axis; TTL is the distance on the optical axis from the center of the object side surface of the first lens to the imaging surface of the vehicle-mounted optical lens.
In addition, in the present embodiment, the on-vehicle optical lens satisfies the condition:
FOV/h/d≤2.5
the FOV is the maximum field angle of the vehicle-mounted optical lens; d is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the vehicle-mounted optical lens; and h is the image height corresponding to the maximum field angle of the vehicle-mounted optical lens.
In addition, the maximum view field angle FOV of the vehicle-mounted optical lens, the whole group of focal length values f of the vehicle-mounted optical lens and the image height h corresponding to the maximum view field angle of the vehicle-mounted optical lens satisfy the following conditions: (FOV xf)/h is not less than 60.
Besides, the vehicle-mounted optical lens satisfies the conditional expression: TTL/f is less than or equal to 7.
Wherein, TTL is a distance on an optical axis from the center of the object-side surface of the first lens element to an imaging surface of the on-board optical lens, and f is a focal length of the entire group of the on-board optical lens. Therefore, parameters such as the focal length of the optical lens, the maximum view field angle and the like are controlled, so that the optical lens has relatively small optical distortion and image deformation in the imaging process, the imaging quality is ensured, the subsequent identification and judgment of imaging details are facilitated, and good image acquisition assistance is provided for driving assistance.
Based on the explanation, the utility model provides an on-vehicle optical lens, it can realize at-40 to 125 within ranges clear formation of image, and the temperature drift is little, satisfies 800 ten thousand pixel imaging requirements, and the light ring is big, can shoot the field of view scope and be 120, is superior to most on the market on-vehicle optical lens product, only uses six lens, compact structure, and used lens number is few, has effectively reduced the whole volume of camera lens.
Specifically, the utility model provides a concrete optical parameters of on-vehicle optical lens of one of them embodiment, as follows the table:
TABLE 1
When the radius of curvature of the surface of the stop and the cover glass is Infinity, the surface is a plane in table 1.
The optical performance parameters of the on-vehicle optical lens of the present embodiment are as shown in table 2:
| item | TTL/f | FOV×f/h | FOV/h/d | BFL/TTL |
| Range | ≤7 | ≥60 | ≤2.5 | ≤0.3 |
TABLE 2
In the present embodiment, the first lens 1, the second lens 2, and the sixth lens 6 are all aspherical lenses, and the aspherical surface types are described as follows:
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E, F, G is an aspheric high-order coefficient.
The aspheric coefficients are specified in table 3 below:
TABLE 3
In this embodiment, the vehicle-mounted optical lens adopts the first lens element as the negative meniscus lens element, the second lens element as the positive meniscus lens element, the third lens element as the double convex positive lens element, the fourth lens element as the double convex positive lens element, the fifth lens element as the negative double concave lens element, the sixth lens element as the positive meniscus lens element, the fourth lens element and the fifth lens element as the cemented lens element, and the cemented lens element is composed of 3 glass spherical lens elements and 3 glass aspheric lens elements, and has the advantages of simple structure, small volume, realization of clear imaging in the range of-40 ° to 125 °, small temperature drift, satisfaction of 800 ten thousand pixel imaging requirements, large aperture, and 120 ° of the range of the shooting field of view.
Performing an optical test on the vehicle-mounted optical lens in the above embodiment, where fig. 2 is an MTF graph of the vehicle-mounted optical lens in the above embodiment, and in fig. 2, an abscissa is a spatial frequency and an ordinate is a contrast; limit is the diffraction limit in the meridian and sagittal directions, and TS 0.00(deg) represents the diffraction curve in the meridian and sagittal directions in the field of view of the image plane 0.00; MTF is a commonly used image quality evaluation index at present, and is called modulation transfer function. Modulation transfer function MTF: the ratio of the contrast of the image to the contrast of the object at a certain spatial frequency. The transmission capability of different spatial frequencies and different contrasts can be reflected. The modulation transfer function MTF can be used to represent the characteristics of the optical system, the larger the MTF is, the better the imaging quality of the system is, as can be seen from fig. 2, the vehicle-mounted optical lens in this embodiment meets the imaging requirement of 800 ten thousand pixels, and has good imaging stability.
Fig. 3 is a defocus graph of the vehicle-mounted optical lens in the embodiment of the present invention; wherein, the abscissa is defocusing amount, and takes millimeter as a unit, and the ordinate is contrast; TS 0.00(deg) represents the diffraction curves in the meridional and sagittal directions at the image plane 0.00 field of view.
Can know by fig. 3, the embodiment of the utility model provides an on-vehicle optical lens, out of focus curve is concentrated, can know that its focus degree is better, means that this camera lens has good resolution, and the tolerance is insensitive simultaneously, easily production and processing.
Additionally, in the embodiment of the present invention, a vehicle-mounted optical lens is further provided, specifically:
the first lens 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens 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 fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
it is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. An on-vehicle optical lens includes, in order from an object side to an image side along an optical axis: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that:
the first lens 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is any one of a convex surface and a concave surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex 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 fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is any one of a concave surface and a convex surface;
the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
wherein, the following relation is satisfied:
the conditional expression is satisfied: f1/f is more than or equal to-2.8 and less than or equal to-0.8, f2/f is more than or equal to 6.3 and less than or equal to 10.3,
0.7≤f3/f≤2.7,0.1≤f4/f≤2.1,-0.5≤f5/f≤-1.5,1.5≤f6/f≤3.5,
f1, f2, f3, f4, f5 and f6 are focal length values of the first lens to the sixth lens in sequence, and f is a focal length value of the whole group of the vehicle-mounted optical lens.
2. A vehicle-mounted optical lens according to claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens, the optical filter is arranged on the image surface side of the sixth lens, and the protective glass is arranged on the image surface side of the optical filter.
3. A vehicle-mounted optical lens according to claim 1, characterized in that: the first lens, the second lens and the sixth lens are glass aspheric lenses respectively, and the third lens, the fourth lens and the fifth lens are glass spherical lenses.
4. A vehicle-mounted optical lens according to claim 1, characterized in that: the fourth lens and the fifth lens are mutually glued to form a group of glued lenses.
5. A vehicle-mounted optical lens according to claim 1, characterized in that: the fourth lens and the fifth lens are separate lenses.
6. A vehicle-mounted optical lens according to claim 1, characterized in that: the difference value of the Abbe numbers V1 and V2 of at least two adjacent lenses of the vehicle-mounted optical lens meets the following requirements: 20 < | V1-V2| < 50, where V1 represents the Abbe number of one of the lenses and V2 represents the Abbe number of the other adjacent lens.
7. A vehicle-mounted optical lens according to claim 1, characterized in that: the vehicle-mounted optical lens meets the conditions: the BFL/TTL is less than or equal to 0.3,
the BFL is the distance from the center of the image side surface of the last lens of the vehicle-mounted optical lens to the imaging surface of the vehicle-mounted optical lens on the optical axis; TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the vehicle-mounted optical lens.
8. A vehicle-mounted optical lens according to claim 1, characterized in that: the vehicle-mounted optical lens meets the conditions: the FOV/h/d is less than or equal to 2.5,
wherein the FOV is the maximum field angle of the vehicle-mounted optical lens; d is the maximum light-passing aperture of the object-side surface of the first lens corresponding to the maximum field angle of the vehicle-mounted optical lens; and h is the image height corresponding to the maximum field angle of the vehicle-mounted optical lens.
9. A vehicle-mounted optical lens according to claim 1, characterized in that: the maximum view field angle FOV of the vehicle-mounted optical lens, the whole group of focal length values f of the vehicle-mounted optical lens and the image height h corresponding to the maximum view field angle of the vehicle-mounted optical lens meet the following requirements: (FOV xf)/h is not less than 60.
10. A vehicle-mounted optical lens according to claim 1, characterized in that: the vehicle-mounted optical lens meets the conditional expression: TTL/f is less than or equal to 7,
wherein, TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the vehicle-mounted optical lens, and f is a focal length value of the entire group of the vehicle-mounted optical lens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117233936A (en) * | 2023-11-10 | 2023-12-15 | 江西联创电子有限公司 | Optical lens |
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| CN117233936A (en) * | 2023-11-10 | 2023-12-15 | 江西联创电子有限公司 | Optical lens |
| CN117233936B (en) * | 2023-11-10 | 2024-03-29 | 江西联创电子有限公司 | Optical lens |
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