CN220933267U - Ultra-wide angle camera lens suitable for on-vehicle OMS system - Google Patents
Ultra-wide angle camera lens suitable for on-vehicle OMS system Download PDFInfo
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Abstract
The utility model relates to a super-wide-angle shooting lens suitable for an on-vehicle OMS system, wherein an optical system of the lens consists of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path; wherein the first lens is a meniscus negative lens without considering the curvature due to the aspherical coefficient; the second lens is a biconcave negative lens; the third lens is a biconvex positive lens; the fourth lens is a biconvex positive lens; the fifth lens is a biconcave negative lens; the sixth lens is a biconvex positive lens; the seventh lens is a meniscus convex positive lens; the lenses are made of glass materials, wherein the fifth lens and the sixth lens are a cemented lens group, and the seventh lens is a glass aspheric lens. The reasonable lens collocation ensures that the optical system realizes super wide angle, large aperture, day and night confocal and low temperature drift design, and simultaneously, the on-axis and off-axis aberration is well corrected, thus having better imaging quality.
Description
Technical Field
The utility model relates to an ultra-wide angle photographing lens suitable for an on-board OMS system, and relates to the technical field of lenses.
Background
In recent years, with the continuous development of computer vision and intelligent automobiles, intelligent cabins become the development direction of the automobile market for further flame explosion after intelligent driving. The intelligent cabin is also called an intelligent automobile passenger monitoring system (OMS), which not only comprises some technologies of ADAS auxiliary driving, but also proposes a plurality of key novel technologies for passengers, such as intelligent technologies of emotion recognition, forgetting matter monitoring, gesture recognition and the like. Besides ensuring the safety of a driver, the driving automobile is also ensured in the aspects of safety, riding experience and the like of passengers in the automobile.
The imaging lens is used as an image acquisition component of the OMS system, and needs to have a larger field angle and higher optical performance, such as higher resolution. And it is used as one of the in-car monitoring, and can be normally used in 24 hours all weather, which requires the lens to have higher environmental stability. Currently, wide-angle lenses with a field angle smaller than 120 ° are commonly used as imaging lenses for OMS systems. Considering the characteristics of OMS systems, the market requires a larger field angle of view of the optical lens to achieve maximum acquisition of image information within the vehicle.
Disclosure of utility model
In view of the defects in the prior art, the technical problem to be solved by the utility model is to provide the ultra-wide angle camera lens suitable for the vehicle-mounted OMS system.
In order to solve the technical problems, the technical scheme of the utility model is as follows: the optical system of the lens consists of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path; the first lens is a meniscus concave-convex lens, the object side surface is a convex surface, and the image side surface is a concave surface under the condition of not considering the inflection caused by the aspheric coefficient; the second lens is a biconcave negative lens, 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 is a biconvex positive lens, 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 is a biconvex positive lens, 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 is a biconcave negative lens, 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; the sixth lens is a biconvex positive lens, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the seventh lens is a meniscus convex positive lens, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; the lenses are made of glass materials, wherein the fifth lens and the sixth lens are a cemented lens group, and the seventh lens is a glass aspheric lens. And the clear imaging is realized, and meanwhile, the imaging device has a larger field angle.
Preferably, the focal length of the optical system is set to be f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively set to be f 1、f2、f3、f4、f5、f6、f7, wherein f 1、f2、f3、f4、f5、f6、f7 and f satisfy the following proportion ：-2.0<f1/f<-1.0,-3.0<f2/f<-2.0,2.0<f3/f<3.0,1.0<f4/f<2.0,-1.0<f5/f<0.0,1.0<f6/f<2.0,4.0<f7/f<5.0.
Preferably, the first lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 50.0; the second lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 70.0; the third lens satisfies the relation: n d≤2.5,Vd is more than or equal to 2.0 and less than or equal to 50.0; the fourth lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 50.0; the fifth lens satisfies the relation: n d≤2.0,Vd is more than or equal to 1.7 and less than or equal to 50.0; the sixth lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and is more than or equal to 50.0; the seventh lens satisfies the relation: n d≤2.0,Vd is more than or equal to 1.7 and less than or equal to 50.0; where N d is the refractive index and V d is the Abbe's constant.
Preferably, the on-axis distance between the lenses satisfies the following relationship: the air space between the first lens and the second lens is: 2.0-2.5 mm; the air space between the second lens and the third lens is: 0.0-0.5 mm; the air space between the third lens and the fourth lens is: 0.0-0.5 mm; the air interval between the fourth lens and the diaphragm is as follows: 0.0-0.5 mm; the air interval between the diaphragm and the fifth lens is: 0.0-0.5 mm; the fifth lens and the sixth lens are glued pieces, and the air interval is 0mm; the air space between the sixth lens and the seventh lens is: 0.0-0.5 mm. Under the condition of meeting imaging requirements, the distance between lenses is reduced, and the total optical length of the lens is facilitated.
Preferably, the aspherical curve equation expression of the seventh lens is:
Wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha 1、α2、α3、α4、α5、α6、α7、α8 is the higher order term coefficient.
Preferably, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 7.
Preferably, the F number of the optical system is less than or equal to 2.0.
Preferably, the image height H of the optical system and the focal length f of the optical system satisfy: h/f is more than or equal to 1.0.
Compared with the prior art, the utility model has the following beneficial effects:
1. The imaging angle of the lens to the object is larger than 170 degrees, and the lens has the advantages of higher imaging definition, large aperture, lower tolerance sensitivity, better high-low temperature stability and the like, and can monitor the in-vehicle scene more comprehensively;
2. by reasonably matching each optical lens, the system has compact and reasonable structure, easy assembly and low tolerance sensitivity, and is more suitable for large-scale high-yield production;
3. The full-glass structure of matching one glass aspheric lens with six glass spherical lenses has higher system stability, can better compensate the displacement of a focusing surface at high temperature and low temperature, and has complex environmental adaptability;
4. The axial chromatic aberration, vertical chromatic aberration and high-order chromatic aberration are corrected, and the imaging system can have higher imaging quality at a large angle.
The utility model will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of the optical structure of the present utility model;
FIG. 2 is a graph of full operating band axial chromatic aberration of the present utility model;
FIG. 3 is a graph of the vertical chromatic aberration of the full operating band of the present utility model;
FIG. 4 is a graph of the distortion of the full working wave Duan Changqu of the present utility model;
In the figure: l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; STO-diaphragm; l5-fifth lens; l6-sixth lens; l7-seventh lens; l8-equivalent glass plate; IMA-imaging plane.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 to 4, the present embodiment provides an ultra-wide angle imaging lens applicable to a vehicle-mounted OMS system, where an optical system of the lens is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens, which are sequentially arranged from left to right along a light incident path; the first lens is a meniscus concave-convex lens, the object side surface is a convex surface, and the image side surface is a concave surface under the condition of not considering the inflection caused by the aspheric coefficient; the second lens is a biconcave negative lens, 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 is a biconvex positive lens, 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 is a biconvex positive lens, 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 is a biconcave negative lens, 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; the sixth lens is a biconvex positive lens, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the seventh lens is a meniscus convex positive lens, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; the lenses are made of glass materials, wherein the fifth lens and the sixth lens are a cemented lens group, and the seventh lens is a glass aspheric lens.
The first lens to the sixth lens are all glass spherical lenses, and the seventh lens is a glass aspheric lens. The first lens and the second lens are glass spherical lenses with negative focal power, and the glass spherical lenses have the function of reducing distortion of an optical system while adjusting light rays with large angles. The fifth lens and the sixth lens form an achromatic double-cemented lens. The reasonable lens collocation ensures that the optical system realizes super wide angle, large aperture, day and night confocal and low temperature drift design, and simultaneously well corrects on-axis and off-axis aberration, thereby having better imaging quality, as shown in figures 2 to 4.
In the embodiment of the utility model, the focal length of the optical system is set to be f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively set to be f 1、f2、f3、f4、f5、f6、f7, wherein f 1、f2、f3、f4、f5、f6、f7 and f satisfy the following ratio ：-2.0<f1/f<-1.0,-3.0<f2/f<-2.0,2.0<f3/f<3.0,1.0<f4/f<2.0,-1.0<f5/f<0.0,1.0<f6/f<2.0,4.0<f7/f<5.0.
In the embodiment of the present utility model, the first lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 50.0; the second lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 70.0; the third lens satisfies the relation: n d≤2.5,Vd is more than or equal to 2.0 and less than or equal to 50.0; the fourth lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 50.0; the fifth lens satisfies the relation: n d≤2.0,Vd is more than or equal to 1.7 and less than or equal to 50.0; the sixth lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and is more than or equal to 50.0; the seventh lens satisfies the relation: n d≤2.0,Vd is more than or equal to 1.7 and less than or equal to 50.0; where N d is the refractive index and V d is the Abbe's constant.
In an embodiment of the present utility model, the on-axis distance between lenses satisfies the following relationship: the air space between the first lens and the second lens is: 2.0-2.5 mm; the air space between the second lens and the third lens is: 0.0-0.5 mm; the air space between the third lens and the fourth lens is: 0.0-0.5 mm; the air interval between the fourth lens and the diaphragm is as follows: 0.0-0.5 mm; the air interval between the diaphragm and the fifth lens is: 0.0-0.5 mm; the fifth lens and the sixth lens are glued pieces, and the air interval is 0mm; the air space between the sixth lens and the seventh lens is: 0.0-0.5 mm.
In the embodiment of the present utility model, the aspherical curve equation expression of the seventh lens is:
Wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha 1、α2、α3、α4、α5、α6、α7、α8 is the higher order term coefficient.
In the embodiment of the present utility model, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 7.
In the embodiment of the utility model, the F number of the optical system is less than or equal to 2.0.
In the embodiment of the utility model, the image height H of the optical system and the focal length f of the optical system satisfy: h/f is more than or equal to 1.0.
In the embodiment of the utility model, the technical indexes of the implementation of the optical system of the embodiment are as follows:
(1) Focal length: EFFL mm or more and 3.0mm or less;
(2) F is less than or equal to 1.9;
(3) Angle of view: 2w is more than or equal to 170 degrees;
(4) Working wave band: visible light band and 940nm short infrared band.
In order to achieve the above design parameters, the specific designs adopted by the optical system of this embodiment are shown in the following table:
the aspherical coefficients of the respective aspherical lenses of the optical system of the present embodiment are as follows:
The optical system of the embodiment meets the requirement of ultra-wide angle while meeting the requirement of imaging performance of the lens by reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like.
The imaging method of the ultra-wide angle camera lens suitable for the vehicle-mounted OMS system comprises the following steps: the optical system of the lens sequentially passes through the first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens and the seventh lens for imaging.
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.
Claims (8)
1. The utility model provides a super wide angle camera lens suitable for on-vehicle OMS system which characterized in that: the optical system of the lens consists of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path; the first lens is a meniscus concave-convex lens, the object side surface is a convex surface, and the image side surface is a concave surface under the condition of not considering the inflection caused by the aspheric coefficient; the second lens is a biconcave negative lens, 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 is a biconvex positive lens, 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 is a biconvex positive lens, 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 is a biconcave negative lens, 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; the sixth lens is a biconvex positive lens, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the seventh lens is a meniscus convex positive lens, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; the lenses are made of glass materials, wherein the fifth lens and the sixth lens are a cemented lens group, and the seventh lens is a glass aspheric lens.
2. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: setting the focal length of the optical system as f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively f 1、f2、f3、f4、f5、f6、f7, wherein f 1、f2、f3、f4、f5、f6、f7 and f satisfy the following proportion ：-2.0<f1/f<-1.0,-3.0<f2/f<-2.0,2.0<f3/f<3.0,1.0<f4/f<2.0,-1.0<f5/f<0.0,1.0<f6/f<2.0,4.0<f7/f<5.0.
3. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: the first lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 50.0; the second lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 70.0; the third lens satisfies the relation: n d≤2.5,Vd is more than or equal to 2.0 and less than or equal to 50.0; the fourth lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and less than or equal to 50.0; the fifth lens satisfies the relation: n d≤2.0,Vd is more than or equal to 1.7 and less than or equal to 50.0; the sixth lens satisfies the relation: n d≤1.8,Vd is more than or equal to 1.5 and is more than or equal to 50.0; the seventh lens satisfies the relation: n d≤2.0,Vd is more than or equal to 1.7 and less than or equal to 50.0; where N d is the refractive index and V d is the Abbe's constant.
4. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: the on-axis distance between the lenses satisfies the following relationship: the air space between the first lens and the second lens is: 2.0-2.5 mm; the air space between the second lens and the third lens is: 0.0-0.5 mm; the air space between the third lens and the fourth lens is: 0.0-0.5 mm; the air interval between the fourth lens and the diaphragm is as follows: 0.0-0.5 mm; the air interval between the diaphragm and the fifth lens is: 0.0-0.5 mm; the fifth lens and the sixth lens are glued pieces, and the air interval is 0mm; the air space between the sixth lens and the seventh lens is: 0.0-0.5 mm.
5. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: the aspherical curve equation expression of the seventh lens is:
Wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha 1、α2、α3、α4、α5、α6、α7、α8 is the higher order term coefficient.
6. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 7.
7. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: the F number of the optical system is less than or equal to 2.0.
8. The ultra-wide angle imaging lens applicable to an on-vehicle OMS system according to claim 1, wherein: the image height H of the optical system and the focal length f of the optical system satisfy the following conditions: h/f is more than or equal to 1.0.
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| CN202322635067.XU CN220933267U (en) | 2023-09-27 | 2023-09-27 | Ultra-wide angle camera lens suitable for on-vehicle OMS system |
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