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

Abstract

The application discloses a low-cost 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, 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 and a thirteenth lens from an object side to an image side. The fourth lens and the fifth lens are achromatic double cemented lens groups, the seventh lens and the eighth lens are achromatic double cemented lens groups, the ninth lens, the tenth lens and the eleventh lens are achromatic triple cemented lens groups, and the twelfth lens and the thirteenth lens are achromatic double cemented lens groups. Reasonable lens collocation enables the optical system to realize large aperture, large target surface, day and night non-defocusing, and good correction of on-axis and off-axis aberrations, so that the lens has good imaging quality.

Description

Technical Field

[0001] This invention relates to the field of lens technology, and in particular to a low-cost 1.2-inch intelligent traffic monitoring system lens and its working method. Background Technology

[0002] In recent years, with the continuous improvement of computer technology, passive infrared imaging technology, and industrial CCD camera photosensitive integrated chips, large-aperture, large-surface day and night type megapixel high-definition lenses have become the development trend of the intelligent traffic monitoring system industry. This is also an inevitable trend to solve the many problems of early traffic cavity control lenses.

[0003] Compared to ordinary traffic monitoring lenses, large-aperture, large-surface, megapixel high-definition monitoring lenses can produce clear images in environments with no visible light or low illumination at night, and the large-surface traffic monitoring lenses can bring better image display effects.

[0004] Currently, mainstream intelligent traffic monitoring systems' large-aperture, large-surface, megapixel high-definition lenses do not fully possess near-infrared imaging capabilities. Therefore, it is essential to prioritize near-infrared imaging in the design of large-aperture, large-surface traffic monitoring lenses for intelligent traffic monitoring systems. Consequently, future traffic monitoring lenses for intelligent traffic monitoring systems should possess features such as large aperture, large surface area, day and night focus stability, and high resolution. To achieve this, the market commonly uses aspherical glass lenses or multiple spherical glass lenses, but this often results in high costs and large size, hindering market adoption. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a low-cost 1.2-inch intelligent traffic monitoring system lens and its working method, which simultaneously takes into account the optical characteristics of low cost, large aperture, large target surface, day and night focus, and high resolution.

[0006] The technical solution of this invention is: a low-cost 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, and a thirteenth lens arranged sequentially from left to right along the incident light path; without considering the curvature caused by aspherical coefficients, 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; and the sixth lens is a biconvex positive lens. The first lens is a convex lens, and the second lens is a convex lens. The third lens is a biconvex positive lens, and the fourth and fifth lenses are cemented lens groups. The seventh and eighth lenses are cemented lens groups. The ninth, tenth, and eleventh lenses are meniscus negative lenses, and the ninth and thirteenth lenses are cemented lens groups. All lenses are made of glass and are all-glass spherical lenses. The fourth, fifth, seventh, and eighth lenses are cemented lens groups. The ninth, tenth, and eleventh lenses are triplet lens groups. The twelfth and thirteenth lenses are cemented lens groups.

[0007] Preferably, 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, and thirteenth lens are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f, respectively. 10 f 11 f 12 f 13 Among them, f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 f 11 f 12 f 13The ratio between f and f is 12.0. <f1 / f<13.0,-4.0<f2 / f<-3.0,-7.0<f3 / f<-6.0,2.0<f4 / f<3.0,-3.0<f5 / f<-2.0,3.0<f6 / f<4.0,1.0<f7 / f<2.0,-4.0<f8 / f<-3.0,-2.0<f9 / f<-1.0,0.1<f 10 / f<1.0, -2.0 <f 11 / f<-1.0, -3 <f 12 / f<-2.0,1.0 <f 13 / f<2.0.

[0008] Preferably, the first 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 relation: 1.7≤N d ≤2.0, V d ≤50.0; The tenth lens satisfies the relationship: 1.5≤N d ≤1.8, 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 relation: 1.4≤N d ≤1.7, V d ≥50.0; The thirteenth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; where N d V is the refractive index. dLet be Abbe's constant.

[0009] Preferably, in the compensation group of the above-mentioned lens, the air gap between the first lens and the second lens is 0.1-0.5 mm; the air gap between the second lens and the third lens is 6.0-6.5 mm; the air gap between the third lens and the fourth lens is 6.0-6.5 mm; the fourth lens and the fifth lens are a cemented lens group with an air gap of 0; the air gap between the fifth lens and the sixth lens is 0.5-1.0 mm; the air gap between the sixth lens and the aperture stop is 16.0-16.5 mm; and the air gap between the aperture stop and the seventh lens is... The air gap between the lenses 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 3.0–3.5 mm; the ninth, tenth, and eleventh lenses are triplet cemented lens groups with an air gap of 0 mm; the air gap between the eleventh and twelfth lenses is 2.0–2.5 mm; the twelfth, thirteenth, and thirteenth lenses are cemented lens groups with an air gap of 0 mm. Reducing the distance between the lenses while meeting imaging requirements is beneficial to the overall optical length of the lens.

[0010] Preferably, the total optical length (TTL) of the optical system and the focal length (f) of the optical system satisfy the following condition: TTL / f ≤ 7.8.

[0011] Preferably, the F-number of the optical system is ≤1.4.

[0012] Preferably, the image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≤1.0.

[0013] Preferably, a filter is provided on the rear side of the thirteenth lens.

[0014] The present invention discloses a low-cost 1.2-inch intelligent traffic monitoring system lens operating method, characterized in that: light rays pass sequentially from left to right through the lens, passing through the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, aperture, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens, and equivalent glass plate before forming an image on the IMA-imaging plane; wherein the fourth and fifth lenses, the seventh and eighth lenses, and the twelfth and thirteenth lenses are cemented doublet lens groups, and the ninth, tenth, and eleventh lenses are cemented triplet lens groups, for the purpose of achromatic aberration correction.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This lens has advantages such as high image clarity, low tolerance sensitivity and good high and low temperature stability. At the same time, it is compatible with 1.2-inch target surfaces, thus enabling more comprehensive monitoring.

[0017] 2. By rationally matching the various optical lenses, the system structure is compact and reasonable, easy to assemble, has low tolerance sensitivity, and is more suitable for large-scale high-yield production;

[0018] 3. All lenses are made of glass spherical lenses, which reduces costs to some extent while adapting to the environment;

[0019] 4. With a smaller F-number and a larger aperture, the system ensures sufficient light intake and can adapt to various complex environments;

[0020] 5. It can effectively compensate for focal plane displacement at high and low temperatures, and has adaptability to complex environments;

[0021] 6. The chromatic aberration along each axis, the transverse chromatic aberration, and higher-order chromatic aberrations have been corrected to ensure that the imaging system can maintain high imaging quality even at large angles.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the optical structure of the present invention;

[0024] Figure 2 This is the axial chromatic aberration diagram of the entire working band of the present invention;

[0025] Figure 3 This is the transverse chromatic aberration diagram of the entire working band of the present invention;

[0026] Figure 4 This is the field curvature distortion diagram of the entire working band of the present invention;

[0027] In the diagram: STO - aperture 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 - equivalent glass plate; IMA - imaging plane. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0029] This invention discloses a low-cost 1.2-inch intelligent traffic monitoring system lens. The lens's optical system comprises, from left to right along the incident light path, 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, and a thirteenth lens. Ignoring aspherical curvature, 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; and the sixth lens is a biconvex positive lens with a convex object-side surface and a convex image-side surface. The first lens is a convex lens, with both its object and image sides being convex. The second lens is a biconvex positive lens, with both its object and image sides being convex. The third lens is a meniscus negative lens, with both its object and image sides being convex. The fourth and fifth lenses are cemented lens groups, the seventh and eighth lenses are cemented lens groups, the ninth, tenth, and eleventh lenses are triple-cemented lens groups, and the twelfth and thirteenth lenses are cemented lens groups.

[0030] The optical power of each lens is combined with positive and negative values, greatly reducing optical aberrations such as spherical aberration. Specifically, the fourth and fifth lenses are achromatic cemented doublet groups, the seventh and eighth lenses are achromatic cemented doublet groups, the ninth, tenth, and eleventh lenses are achromatic triplet groups, and the twelfth and thirteenth lenses are achromatic cemented doublet groups. Through this reasonable lens combination, the optical system achieves a large aperture, a large target surface, and remains in focus day and night. Furthermore, by effectively correcting on-axis and off-axis aberrations, the lens exhibits good image quality. Figures 2 to 4 As shown.

[0031] Specifically, 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, and thirteenth lens are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f, respectively. 10 f 11 f12 f 13 Among them, f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 f 11 f 12 f 13 The ratio between f and f is 12.0. <f1 / f<13.0,-4.0<f2 / f<-3.0,-7.0<f3 / f<-6.0,2.0<f4 / f<3.0,-3.0<f5 / f<-2.0,3.0<f6 / f<4.0,1.0<f7 / f<2.0,-4.0<f8 / f<-3.0,-2.0<f9 / f<-1.0,0.1<f 10 / f<1.0, -2.0 <f 11 / f<-1.0, -3 <f 12 / f<-2.0,1.0 <f 13 / f<2.0.

[0032] The first 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 relation: 1.7≤N d ≤2.0, V d ≤50.0; The tenth lens satisfies the relationship: 1.5≤N d ≤1.8, 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 relation: 1.4≤N d ≤1.7, Vd ≥50.0; The thirteenth lens satisfies the relationship: 1.9≤N d ≤2.2, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0033] The air gap between the first and second lenses in the lens compensation group 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 6.0–6.5 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 0.5–1.0 mm; the air gap between the sixth lens and the aperture stop is 16.0–16.5 mm; and the air gap between the aperture stop and the seventh lens is… The air gap between the seventh and eighth lenses is 1.5–2.0 mm; the air gap between the eighth and ninth lenses is 3.0–3.5 mm; the air gap between the ninth, tenth, and eleventh lenses is 0 mm; the air gap between the eleventh and twelfth lenses is 2.0–2.5 mm; the air gap between the twelfth, thirteenth, and thirteenth lenses is 0 mm. Reducing the distance between the lenses while meeting imaging requirements is beneficial to the overall optical length of the lens.

[0034] The total optical length (TTL) of the lens's optical system and the focal length (f) of the optical system satisfy the following conditions: TTL / f ≤ 7.8; F-number of the optical system ≤ 1; image height (H) of the optical system and the focal length (f) of the optical system satisfy the following condition: H / f ≤ 1.0; a filter is provided on the rear side of the thirteenth lens.

[0035] The technical specifications of the optical system achieved in a specific embodiment are as follows:

[0036] (1) Focal length: 11.5≤EFFL≤12.5mm;

[0037] (2) Aperture F≤1.4;

[0038] (3) Field of view: 2w ≥ 80°;

[0039] (4) Operating bands: visible light and short-wave infrared bands.

[0040] To achieve the above design parameters, the specific design of the optical system adopted in this embodiment is shown in the table below:

[0041]

[0042]

[0043] This embodiment achieves a low-cost, large-aperture, large-target-surface optical system with day and night focus and high resolution through reasonable lens matching. It also effectively corrects on-axis and off-axis aberrations, resulting in good image quality. Figures 2 to 4 As shown.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A low-cost 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, and a thirteenth 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 biconvex positive lens with a convex object-side surface and a convex image-side surface. The seventh lens is a biconvex positive lens... The object-side surface is convex, and the image-side surface is convex; the eighth lens is a meniscus negative lens, with a concave object-side surface and a convex image-side surface; the ninth lens is a meniscus negative lens, with a convex object-side surface and a concave image-side surface; the tenth lens is a biconvex positive lens, with a convex object-side surface and a convex image-side surface; the eleventh lens is a meniscus negative lens, with a concave object-side surface and a convex image-side surface; the twelfth lens is a biconcave negative lens, with a concave object-side surface and a concave image-side surface; the thirteenth lens is a biconvex positive lens, with a convex object-side surface and a convex image-side surface; all lenses are made of glass and are all-glass spherical lenses, among which the fourth and fifth lenses are cemented lens groups, the seventh and eighth lenses are cemented lens groups, the ninth, tenth, and eleventh lenses are triplet lens groups, and the twelfth and thirteenth lenses are cemented lens groups.

2. The low-cost 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The focal length of the lens is The focal lengths of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, and thirteenth lenses are: , , , , , , , , , , , , ,in , , , , , , , , , , , , and Meets the following ratio: 12.0 < / <13.0, -4.0< / <-3.0, -7.0< / <-6.0, 2.0< / <3.0, -3.0< / <-2.0, 3.0< / <4.0, 1.0< / <2.0, -4.0< / <-3.0, -2.0< / <-1.0, 0.1< / <1.0, -2.0< / <-1.0, -3< / <-2.0, 1.0< / <2.

0.

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

4. The low-cost 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: The air gap between the first and second lenses of the lens is 0.1~0.5mm; the air gap between the second and third lenses is 6.0~6.5mm; the air gap between the third and fourth lenses is 6.0~6.5mm; the fourth and fifth lenses are a cemented lens group with an air gap of 0mm; the air gap between the fifth and sixth lenses is 0.5~1.0mm; the air gap between the sixth lens and the aperture stop is 16.0~16.5mm; the air gap between the aperture stop and the seventh lens is 1.5~2.0mm; the seventh and eighth lenses are a cemented lens group with an air gap of 0mm; the air gap between the eighth and ninth lenses is 3.0~3.5mm; the ninth, tenth, and eleventh lenses are a triple cemented lens group with an air gap of 0mm; the air gap between the eleventh and twelfth lenses is 2.0~2.5mm; the twelfth, thirteenth, and thirteenth lenses are a cemented lens group with an air gap of 0mm.

5. The low-cost 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.

8.

6. The low-cost 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 low-cost 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 low-cost 1.2-inch intelligent traffic monitoring system lens according to claim 1, characterized in that: A filter is provided on the rear side of the thirteenth lens of the lens.

9. The low-cost 1.2-inch intelligent traffic monitoring system lens according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that: The optical system of the lens achieves the following technical specifications: (1) Focal length: 11.5 ≤ EFFL ≤ 12.5 mm; (2) Aperture F≤1.4; (3) Field of view: 2w ≥ 80°; (4) Operating bands: visible light and short-wave infrared bands.

10. A method for operating a low-cost 1.2-inch intelligent traffic monitoring system lens as described in any one of claims 1-9, characterized in that: Light rays pass sequentially from left to right through the lens, including the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, aperture, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens, and equivalent glass plate, before forming an image on the IMA-imaging plane. Among these, the fourth and fifth lenses, the seventh and eighth lenses, and the twelfth and thirteenth lenses form a cemented doublet lens group, while the ninth, tenth, and eleventh lenses form a cemented triplicate lens group for achromatic purposes.

Images