1.2-inch intelligent traffic monitoring system lens and working method thereof

Abstract

The invention relates to a 1.2-inch intelligent traffic monitoring system lens and a working method thereof. An optical imaging system of the lens is sequentially provided with a first lens to a fourteenth lens from an object space to an image space. Wherein the focal power of each lens adopts a positive and negative combined form, so that optical aberrations such as spherical aberration and the like are greatly reduced. Wherein the fourth lens and the fifth lens form an achromatic doublet lens group, the seventh lens and the eighth lens form an achromatic doublet lens group, the ninth lens and the tenth lens form an achromatic doublet lens group, and the eleventh lens, the twelfth lens and the thirteenth lens form an achromatic triplet lens group. Through reasonable lens matching, an optical system realizes large aperture, large target surface and no defocus in day and night, and through good correction of on-axis and off-axis aberrations, the lens has good imaging quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lens, in particular to a 1.2 inch intelligent traffic monitoring system lens and a working method thereof. BACKGROUND

[0002] With the increasing busy of traffic system, the role of intelligent traffic monitoring system is more and more prominent, and license plate recognition is an important part of intelligent traffic monitoring. Real-time clear imaging of license plate information will provide reliable evidence for the public security traffic management department to extract information of illegal vehicles. The mainstream intelligent traffic monitoring system with large aperture and large target surface million-pixel high-definition lens does not completely have near-infrared imaging function. Therefore, in the design of the large aperture and large target surface traffic monitoring lens of the intelligent traffic monitoring system, it is necessary to focus on the near-infrared band imaging. Therefore, the traffic monitoring lens of the future intelligent traffic monitoring system should have the elements of large aperture, large target surface, day and night non-focusing, high resolution, etc. SUMMARY

[0003] In view of the above shortcomings of the prior art, the technical problem to be solved by the present application is to provide a 1.2 inch intelligent traffic monitoring system lens and a working method thereof, which can simultaneously consider the optical characteristics of large aperture, large target surface, day and night non-focusing, high resolution, etc.

[0004] The technical scheme of the present application is: a 1.2-inch intelligent traffic monitoring system lens, characterized in that: the optical system of the lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in order from left to right along the light incident path; without considering the reverse bending caused by the aspherical surface coefficient, the first lens is a biconvex positive lens, the object side is convex, and the image side is convex; the second lens is a meniscus concave negative lens, the object side is convex, and the image side is concave; the third lens is a meniscus concave negative lens, the object side is convex, and the image side is concave; the fourth lens is a meniscus convex positive lens, the object side is concave, and the image side is convex; the fifth lens is a meniscus concave negative lens, the object side is concave, and the image side is convex; the sixth lens is a meniscus convex positive lens, the object side is concave, and the image side is convex; the seventh lens is a biconvex positive lens, the object side is convex, and the image side is convex; the eighth lens is a biconcave negative lens, the object side is concave, and the image side is concave; the ninth lens is a biconvex positive lens, the object side is convex, and the image side is convex; the tenth lens is a meniscus concave negative lens, the object side is concave, and the image side is convex; the eleventh lens is a meniscus concave negative lens, the object side is convex, and the image side is concave; the twelfth lens is a biconvex positive lens, the object side is convex, and the image side is convex; the thirteenth lens is a meniscus concave negative lens, the object side is concave, and the image side is convex; the fourteenth lens is a biconvex positive lens, the object side is convex, and the image side is convex; each lens is made of glass material and the optical system is a full-glass spherical lens system, wherein the fourth lens and the fifth lens are a cemented lens group, the seventh lens and the eighth lens are a cemented lens group, the ninth lens and the tenth lens are a cemented lens group, and the eleventh lens, the twelfth lens and the thirteenth lens are a three-cemented lens group.

[0005] Preferably, the focal length of the zoom optical imaging system of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens are f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 , f 11 , f 12 , f 13 , f 14 , f 10 , f 11 , f 12 , f 13 , f 14with f satisfying the following ratios: 13.0 < f1 / f < 14.0, -3.0 < f2 / f < -2.0, -3.0 < f3 / f < -2.0, 1.0 < f4 / f < 2.0, -2.0 < f5 / f < -1.0, 2.0 < f6 / f < 3.0, 1.0 < f7 / f < 2.0, -3.0 < f8 / f < -2.0, 1.0 < f9 / f < 2.0, -6.0 < f 10 10 / f < -5.0, -2.0 < f 11 11 / f < 1.0, 0 < f 12 12 / f < 1.0, -2.0 < f 13 13 / f < 1.0, 1.0 < f 14 14 / f < 2.0.

[0006] Preferably, the first lens of the above lens satisfies the relationship: 1.6 < N d < 1.9, V d < 50.0; the second lens satisfies the relationship: 1.6 < N d < 1.9, V d < 50.0; the third lens satisfies the relationship: 1.4 < N d < 1.7, V d > 50.0; the fourth lens satisfies the relationship: 1.6 < N d < 1.9, V d < 50.0; the fifth lens satisfies the relationship: 1.7 < N d < 2.0, V d < 50.0; the sixth lens satisfies the relationship: 1.9 < N d < 2.2, V d < 50.0; the seventh lens satisfies the relationship: 1.5 < N d < 1.8, V d > 50.0; the eighth lens satisfies the relationship: 1.4 < N d < 1.7, V d > 50.0; the ninth lens satisfies the relationship: 1.5 < N d < 1.8, V d > 50.0; the tenth lens satisfies the relationship: 1.7 < N d < 2.0, V d < 50.0; the eleventh lens satisfies the relationship: 1.9 < N d < 2.2, V d < 50.0; the twelfth lens satisfies the relationship: 1.5 < N d < 1.8, V d > 50.0; the thirteenth lens satisfies the relationship: 1.9 < N d < 2.2, V d≤50.0; the fourteenth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; wherein N d is the refractive index, V d is the Abbe number.

[0007] Preferably, the air gap between the first lens and the second lens in the compensation group of the above lens is: 0.1-0.5mm; the air gap between the second lens and the third lens is: 6.0-6.5mm; the air gap between the third lens and the fourth lens is: 6.5-7.0mm; the fourth lens and the fifth lens are cemented lens groups, and the air gap is 0; the air gap between the fifth lens and the sixth lens is: 0.1-0.5mm; the air gap between the sixth lens and the diaphragm is: 9.5-10.0mm; the air gap between the diaphragm and the seventh lens is: 1.5-2.0mm; the seventh lens and the eighth lens are cemented lens groups, and the air gap is 0; the air gap between the eighth lens and the ninth lens is: 0.1-0.5mm; the ninth lens and the tenth lens are cemented lens groups, and the air gap is 0; the air gap between the tenth lens and the eleventh lens is: 2.5-3.0mm; the eleventh lens, the twelfth lens and the thirteenth lens are three cemented lens groups, and the air gap is 0; the air gap between the thirteenth lens and the fourteenth lens is: 1.0-1.5mm.

[0008] Preferably, the total optical length TTL of the optical system of the above lens and the focal length f of the optical system satisfy: TTL / f≤7.3.

[0009] Preferably, the F number of the optical system of the above lens is ≤1.4.

[0010] Preferably, the image height H of the optical system of the above lens and the focal length f of the optical system satisfy: H / f≤1.0.

[0011] Preferably, the rear side of the fourteenth lens is provided with a filter.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] 1. The lens has higher imaging clarity, lower tolerance sensitivity and better high-low temperature stability, etc., and is suitable for a 1.2 inch target surface, so that it can be more comprehensive for monitoring;

[0014] 2. By reasonably matching each optical lens, the system structure is compact and reasonable, easy to assemble, low in tolerance sensitivity, and more suitable for large-scale high-yield production;

[0015] 3. All glass spherical lenses are used, which reduces the cost to some extent while adapting to the environment;

[0016] 4. Smaller F number and larger light aperture, which ensures sufficient light quantity of the system and can adapt to various complex environments;

[0017] 5. Can make better compensation for the focal plane displacement at high and low temperatures, and has adaptability to complex environments;

[0018] 6. Corrects the axial color difference, sagittal color difference and high-order color difference, and ensures that the imaging system can have higher imaging quality at a large angle.

[0019] The application will be further described in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the optical structure of the application;

[0021] Figure 2 is an axial color difference diagram of the full working waveband of the application;

[0022] Figure 3 is a sagittal color difference diagram of the full working waveband of the application;

[0023] Figure 4 is a field curvature distortion diagram of the full working waveband of the application;

[0024] In the figure: STO-optical stop; L1-first lens; L2-second lens; L3-third lens; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-seventh lens; L8-eighth lens; L9-ninth lens; L10-tenth lens; L11-eleventh lens; L12-twelfth lens; L13-thirteenth lens; L14-fourteenth lens; L15-equivalent glass flat plate; IMA-imaging surface. DETAILED DESCRIPTION

[0025] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0026] The technical scheme of the present application is: a 1.2-inch intelligent traffic monitoring system lens, characterized in that: the optical system of the lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in order from left to right along the light incident path; without considering the reverse bending caused by the aspherical surface coefficient, the first lens is a biconvex positive lens, the object side is convex, and the image side is convex; the second lens is a meniscus concave negative lens, the object side is convex, and the image side is concave; the third lens is a meniscus concave negative lens, the object side is convex, and the image side is concave; the fourth lens is a meniscus convex positive lens, the object side is concave, and the image side is convex; the fifth lens is a meniscus concave negative lens, the object side is concave, and the image side is convex; the sixth lens is a meniscus convex positive lens, the object side is concave, and the image side is convex; the seventh lens is a biconvex positive lens, the object side is convex, and the image side is convex; the eighth lens is a biconcave negative lens, the object side is concave, and the image side is concave; the ninth lens is a biconvex positive lens, the object side is convex, and the image side is convex; the tenth lens is a meniscus concave negative lens, the object side is concave, and the image side is convex; the eleventh lens is a meniscus concave negative lens, the object side is convex, and the image side is concave; the twelfth lens is a biconvex positive lens, the object side is convex, and the image side is convex; the thirteenth lens is a meniscus concave negative lens, the object side is concave, and the image side is convex; the fourteenth lens is a biconvex positive lens, the object side is convex, and the image side is convex; each lens is made of glass material and the optical system is a full-glass spherical lens system, wherein the fourth lens and the fifth lens are a cemented lens group, the seventh lens and the eighth lens are a cemented lens group, the ninth lens and the tenth lens are a cemented lens group, and the eleventh lens, the twelfth lens and the thirteenth lens are a three-cemented lens group.

[0027] Wherein, the refractive power of each lens adopts the form of positive and negative combination, which greatly reduces the spherical aberration and other optical aberrations; wherein the fourth lens and the fifth lens are an achromatic double-cemented lens group, the seventh lens and the eighth lens are an achromatic double-cemented lens group, the ninth lens and the tenth lens are an achromatic double-cemented lens group, and the eleventh lens, the twelfth lens and the thirteenth lens are an achromatic three-cemented lens group; reasonable lens matching makes the optical system realize large aperture, large target surface, day and night without defocus, and through good correction of on-axis and off-axis aberrations, the lens has good imaging quality, as shown in Figures 2 to 4 .

[0028] The focal length of the zoom optical imaging system of the specific lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, and the fourteenth lens are f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 , f 11 , f 12 , f 13 , f 14 , f 10 , f 11 , f 12 , f 13 , f 14 , f 10 , f 11 , f 12 , f 13 , f 14 , f

[0029] The first lens of the specific lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; the second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; the third lens satisfies the relationship: 1.4≤N d ≤1.7, V d ≥50.0; the fourth lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; the fifth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the sixth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; the seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the eighth lens satisfies the relationship: 1.4≤N d≤1.7, V d ≥50.0; the ninth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the tenth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the eleventh lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; the twelfth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the thirteenth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; the fourteenth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; wherein N d is the refractive index, V d is the Abbe number.

[0030] The air gap between the first lens and the second lens in the compensation group of the specific lens is 0.1-0.5mm; the air gap between the second lens and the third lens is 6.0-6.5mm; the air gap between the third lens and the fourth lens is 6.5-7.0mm; the fourth lens and the fifth lens are a cemented lens group, and the air gap is 0; the air gap between the fifth lens and the sixth lens is 0.1-0.5mm; the air gap between the sixth lens and the diaphragm is 9.5-10.0mm; the air gap between the diaphragm and the seventh lens is 1.5-2.0mm; the seventh lens and the eighth lens are a cemented lens group, and the air gap is 0; the air gap between the eighth lens and the ninth lens is 0.1-0.5mm; the ninth lens and the tenth lens are a cemented lens group, and the air gap is 0; the air gap between the tenth lens and the eleventh lens is 2.5-3.0mm; the eleventh lens, the twelfth lens and the thirteenth lens are a three-cemented lens group, and the air gap is 0; the air gap between the thirteenth lens and the fourteenth lens is 1.0-1.5mm. In the case of meeting the imaging requirements, reducing the distance between each lens is beneficial to the total length of the lens.

[0031] The optical total length TTL of the specific lens and the focal length f of the optical system satisfy: TTL / f≤7.3; the F number of the optical system is ≤1.4; the image height H of the optical system and the focal length f of the optical system satisfy: H / f≤1.0.

[0032] The technical index realized by the optical system of the embodiment of the application is as follows:

[0033] (1) focal length: 11.5≤EFFL≤12.5mm;

[0034] (2) aperture F≤1.4;

[0035] (3) field of view angle: 2w≥80°;

[0036] (4) working waveband: visible light and short wave infrared waveband.

[0037] To realize the above design parameters, the specific design of the optical system of the embodiment of the present application is shown in the following table:

[0038]

[0039]

[0040] The embodiment realizes the design of large aperture, large target surface, day and night non-defocus and high resolution by reasonable lens collocation, and simultaneously well corrects on-axis and off-axis aberration, and has good imaging quality, as shown in FIG. 1. Figures 2 to 4

[0041] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content into equivalent embodiments. However, any simple modification, equivalent change and modification made on the above embodiment according to the technical essence of the present application, without departing from the technical scheme of the present application, still falls within the protection scope of the present application.​

Claims

1. A 1.2-inch intelligent traffic monitoring system lens, characterized in that: The optical system of the lens consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, an aperture stop, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially from left to right along the incident light path. The first lens is a biconvex positive lens with a convex object-side surface and a convex image-side surface. The second lens is a meniscus negative lens with a convex object-side surface and a concave image-side surface. The third lens is a meniscus negative lens with a convex object-side surface and a concave image-side surface. The fourth lens is a convex meniscus positive lens with a concave object-side surface and a convex image-side surface. The fifth lens is a meniscus negative lens with a concave object-side surface and a convex image-side surface. The sixth lens is a convex meniscus positive lens with a concave object-side surface and a convex image-side surface. The seventh lens is a biconvex positive lens with a convex object-side surface and a convex image-side surface. The eighth lens is a biconcave negative lens, with both its object-side and image-side surfaces being concave. The ninth lens is a biconvex positive lens, with both its object-side and image-side surfaces being convex. The tenth lens is a meniscus negative lens, with both its object-side and image-side surfaces being concave. The eleventh lens is a meniscus negative lens, with both its object-side and image-side surfaces being convex. The twelfth lens is a biconvex positive lens, with both its object-side and image-side surfaces being convex. The thirteenth lens is a meniscus negative lens, with both its object-side and image-side surfaces being concave. The fourteenth lens is a biconvex positive lens, with both its object-side and image-side surfaces being convex. All lenses are made of glass and the optical system is an all-glass spherical lens system. Among them, the fourth and fifth lenses are cemented lens groups, the seventh and eighth lenses are cemented lens groups, the ninth and tenth lenses are cemented lens groups, and the eleventh, twelfth, and thirteenth lenses are triple-cemented lens groups.

2. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The focal length of the zoom optical imaging system of the lens is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens, and fourteenth lens are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f, respectively. 10 f 11 f 12 f 13 f 14 Among them, f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 f 11 f 12 f 13 f 14 The ratio between f and f is 13.

0. <f1 / f<14.0,-3.0<f2 / f<-2.0,-3.0<f3 / f<-2.0,1.0<f4 / f<2.0,-2.0<f5 / f<-1.0,2.0<f6 / f<3.0,1.0<f7 / f<2.0,-3.0<f8 / f<-2.0,1.0<f9 / f<2.0,-6.0<f 10 / f<-5.0, -2.0 <f 11 / f<-1.0,0 <f 12 / f<1.0, -2.0 <f 13 / f<-1.0,1.0 <f 14 / f<2.

0.

3. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The first lens of the lens satisfies the relationship: 1.6 ≤ N d ≤1.9, V d ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The third lens satisfies the relationship: 1.4≤N d ≤1.7, V d ≥50.0; The fourth lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The fifth lens satisfies the relation: 1.7≤N d ≤2.0, V d ≤50.0; The sixth lens satisfies the relation: 1.9≤N d ≤2.2, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The eighth lens satisfies the relationship: 1.4≤N d ≤1.7, V d ≥50.0; The ninth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The tenth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; The eleventh lens satisfies the relation: 1.9≤N d ≤2.2, V d ≤50.0; The twelfth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The thirteenth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; The fourteenth lens satisfies the relation: 1.9≤N d ≤2.2, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

4. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: In the compensation group of the lens, the air gap between the first and second lenses is 0.1–0.5 mm; the air gap between the second and third lenses is 6.0–6.5 mm; the air gap between the third and fourth lenses is 6.5–7.0 mm; the fourth and fifth lenses are a cemented lens group with no air gap; the air gap between the fifth and sixth lenses is 0.1–0.5 mm; the air gap between the sixth lens and the aperture stop is 9.5–10.0 mm; and the air gap between the aperture stop and the seventh lens is… The air gap is 1.5–2.0 mm; the seventh and eighth lenses are cemented lens groups with an air gap of 0 mm; the air gap between the eighth and ninth lenses is 0.1–0.5 mm; the ninth and tenth lenses are cemented lens groups with an air gap of 0 mm; the air gap between the tenth and eleventh lenses is 2.5–3.0 mm; the eleventh, twelfth, and thirteenth lenses are triple cemented lens groups with an air gap of 0 mm; and the air gap between the thirteenth and fourteenth lenses is 1.0–1.5 mm.

5. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The total optical length (TTL) of the optical system of the lens satisfies the following relationship with the focal length (f) of the optical system: TTL / f ≤ 7.

3.

6. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The optical system of the lens has an F-number ≤ 1.

4.

7. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The image height H of the optical system of the lens and the focal length f of the optical system satisfy the following condition: H / f≤1.

0.

8. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The technical specifications achieved by the optical system in this embodiment are as follows: (1) Focal length: 11.5≤EFFL≤12.5mm; (2) Aperture F≤1.4; (3) Field of view: 2w ≥ 80°; (4) Operating bands: visible light and short-wave infrared bands.

9. The 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The specific parameters of the optical system used in the lens are shown in the table below:

10. A method for operating a 1.2-inch intelligent traffic monitoring system lens as described in any one of claims 1-9, characterized in that: The incident light rays pass sequentially from left to right through the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, aperture stop, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens, fourteenth lens, and equivalent glass plate, and form an image on the IMA imaging plane. Among them, the fourth and fifth lenses, the seventh and eighth lenses, and the ninth and tenth lenses are cemented doublet lens groups to achieve achromatic aberration, and the eleventh, twelfth, and thirteenth lenses are cemented triplet lens groups to achieve achromatic aberration.

Images