CN112415727A

CN112415727A - Be used for commercial car driving big light ring high definition camera lens night

Info

Publication number: CN112415727A
Application number: CN202011433289.8A
Authority: CN
Inventors: 吴强华; 张福美; 汪晓旭
Original assignee: Jiangxi Telaisi Optical Co ltd
Current assignee: Jiangxi Telaisi Optical Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-02-26

Abstract

The invention discloses a large-aperture high-definition lens for driving a commercial vehicle at night, which comprises: the lens system comprises a meniscus glass lens with a negative focal length, a plastic aspheric lens with a positive focal length, a third lens with a focal length, a diaphragm, the plastic aspheric lens with the negative focal length, a glue aspheric lens with a positive focal length and the plastic aspheric lens with the positive focal length which are sequentially arranged from the object side to the image side along an optical axis.

Description

Be used for commercial car driving big light ring high definition camera lens night

Technical Field

The invention relates to a large-aperture high-definition lens for driving a commercial vehicle at night.

Background

Along with the development of society, people are getting bigger and bigger to the demand of driving at night, driving at night has very big influence to driver's fatigue to be used for commercial car night driving camera lens ubiquitous aperture undersize at present, luminance is darker relatively, so the during operation 940 nm's lamp just need add a lot, leads to generating heat very seriously, and the heat of transmission can lead to the driver to feel that there is the burning sensation in the face, aggravates driver's fatigue driving at night. The imaging of the night driving lens of the existing commercial vehicle is mainly 940nm near infrared imaging, mainly 1/3 chips are more, but the 1/3 chip can cause the size of the matched lens to be large, the module is not beneficial to being installed at the position of a Green pillar of the vehicle, the position of the Green pillar refers to two sides of a front window, the size and the weight of the lens are increased due to the fact that the large aperture is opened for matching the large target surface of the 1/3 chip in the prior art, the cost is improved, the miniaturization is not beneficial, and the night driving lens of the existing technical patent for the commercial vehicle is almost blank.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a large-aperture high-definition lens for driving a commercial vehicle at night.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the utility model provides a be used for night commercial car to drive big light ring high definition camera lens, includes: the lens comprises a meniscus glass lens with a negative focal length, a plastic aspheric lens with a positive focal length, a third lens with a focal length, a diaphragm, a plastic aspheric lens with a negative focal length, a rubber aspheric lens with a positive focal length and a plastic aspheric lens with a positive focal length which are sequentially arranged from the object side to the image side along an optical axis, wherein the effective focal length of the plastic aspheric lens with a positive focal length is f5, the plastic aspheric lens with a positive focal length is f6, and the ratio range of f6 to f5 is 2.5< f6/f5< 5.2.

Preferably, the optical filter is further included, and the plastic aspheric lens with positive focal length E6 is located between the plastic aspheric lens with positive focal length and the optical filter.

Preferably, the effective focal length of the meniscus glass lens with the negative focal length is f1, the effective focal length of the plastic aspheric lens with the positive focal length is f2, the effective focal length of the third lens with the positive focal length is f3, the effective focal length of the plastic aspheric lens with the positive focal length is f4, the ratio range of f1 to f3 is-0.58 < f1/f3 < -2.54, and the ratio range of f2 to f4 is-18.2 < f2/f4 < 22.3.

Preferably, the third lens having a positive focal length is a double convex glass lens.

Preferably, the abbe number of the plastic aspherical lens having a positive focal length is less than 30.

Preferably, the abbe number of the plastic aspherical lens having a positive focal length and the abbe number of the plastic aspherical lens having a positive focal length are both larger than 50.

Preferably, the refractive index of the third lens having a positive focal length is greater than 1.70.

Preferably, the refractive index of the plastic aspherical lens having the negative focal length is greater than 1.60 and less than 1.75.

The invention has the following beneficial effects: the invention reduces the weight and volume of the lens, reduces the manufacturing cost of the lens and accelerates the research and development period; the optical parameters in the optical lens system are well matched with imaging conditions, so that the aberration of the lens system is corrected to a greater extent, the MTF resolution is high, high definition on the whole image surface is ensured, uniform imaging can be realized, the luminous flux at night and the night image pickup effect are improved, in addition, all optical glass lenses adopt aspheric surface design, the cold processing performance of the lenses is good, the glass material cost is low, the price of finished lenses is lower, and the volume production rate is high; all plastic lenses have good processing performance, the research and development period is shortened, and the research and development efficiency is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a graph of the Modulation Transfer Function (MTF) for the 940nm band of the present invention;

FIG. 3 is a defocus plot of the present invention;

FIG. 4 is a graph of relative illumination according to the present invention;

FIG. 5 is an optical distortion diagram of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings of the specification:

as shown in fig. 1, a large-aperture high-definition lens for driving a commercial vehicle at night comprises: the lens system comprises a meniscus glass lens E1 with a negative focal length, a plastic aspheric lens E2 with a positive focal length, a third block lens E3 with a positive focal length, a diaphragm ST, a plastic aspheric lens E4 with a negative focal length, a plastic aspheric lens E5 with a positive focal length and a plastic aspheric lens E6 with a positive focal length, wherein the effective focal length of the plastic aspheric lens E5 with a positive focal length is f5, the plastic aspheric lens E6 with a positive focal length is f6, and the ratio range of f6 to f5 is 2.5< f6/f5< 5.2.

As shown in fig. 1, the optical filter E7 is further included, and the plastic aspheric lens with positive focal length E6 is located between the plastic aspheric lens with positive focal length E5 and the optical filter E7.

As shown in fig. 1, the effective focal length of the meniscus glass lens E1 with negative focal length is f1, the effective focal length of the plastic aspheric lens E2 with positive focal length is f2, the effective focal length of the third aspheric lens E3 with positive focal length is f3, the effective focal length of the plastic aspheric lens E4 with negative focal length is f4, the ratio of f1 to f3 ranges from-0.58 < f1/f3 < -2.54, the ratio of f2 to f4 ranges from-18.2 < f2/f4 < 22.3, and the third aspheric lens E3 with positive focal length is a biconvex glass lens.

As shown in fig. 1, the abbe number of the plastic aspheric lens E2 with positive focal length is less than 30, the abbe number of the plastic aspheric lens E2 with positive focal length is less than 30, the abbe number of the plastic aspheric lens E5 with positive focal length and the abbe number of the plastic aspheric lens E6 with positive focal length are both greater than 50, the refractive index of the third lens E3 with positive focal length is greater than 1.70, and the refractive index of the plastic aspheric lens E4 with negative focal length is greater than 1.60 and less than 1.75.

Various parameters of the large-aperture high-definition lens for driving the commercial vehicle at night are listed in the table 1 and the table 2 in sequence. The effective focal length of the optical system provided in the first table is 3.90mm, the clear aperture is F/1.15, the total length of the optical system is 15.4mm, the field angle is 60 degrees, the thickness of the optical filter is 0.7mm, the refractive index is 1.52, and the Abbe constant is 64.2. Wherein Surf is surface number, Type is surface Type, Radius is curvature Radius, Thickness is lens Thickness, Index is refractive Index, ABB is dispersion coefficient, and EFL-E is focal length.

Surf	Type	Radius	Thickness	Index	ABB	EFL-E
							OBJ	STANDARD	INFINITY	INFINITY
1	STANDARD	7.366336	0.6	1.487489	70.441164	-9.580747
							2	STANDARD	2.756792	2.432036
3	EVENASPH	-2.625689	1.417316	1.635517	23.971842	59.086394
							4	EVENASPH	-2.950494	0.1
5	STANDARD	6.295039	1.98736	1.7725	49.624284	5.370585
							6	STANDARD	-9.922226	0.5
STO	STANDARD	INFINITY	0.488003
							8	EVENASPH	-6.393318	0.65	1.635517	23.971842	-2.951659
9	EVENASPH	2.621479	0.155376
							10	EVENASPH	3.140794	2.182415	1.535081	55.779665	3.92509
11	EVENASPH	-4.59005	0.1
							12	EVENASPH	4.364923	1.187495	1.535081	55.779665	14.774412
13	EVENASPH	9.016579	0.5
							14	STANDARD	INFINITY	0.7	1.516798	64.198258
15	STANDARD	INFINITY	2.4

TABLE 1

Surf1, Surf2 correspond to both surfaces of a meniscus glass lens E1 having a negative focal length, Surf3, Surf4 correspond to both surfaces of a plastic aspherical lens E2 having a positive focal length, Surf5, Surf6 correspond to both surfaces of a third block lens E3 having a positive focal length, Surf sto is a diaphragm device ST surface, Surf8, Surf9 correspond to both surfaces of a plastic aspherical lens E4 having a negative focal length, Surf10, Surf11 correspond to both surfaces of a plastic aspherical lens E5 having a positive focal length, Surf12, Surf13 correspond to both surfaces of a plastic aspherical lens E6 having a positive focal length, and Surf14, Surf15 correspond to both surfaces of a filter 493e 7.

Aspheric data are shown in table two:

watch two

Fig. 2 is a graph of the Modulation Transfer Function (MTF) in the 940nm band, representing the integrated resolving power of the optical system, where the horizontal axis represents spatial frequency in units: the number of turns per millimeter (cycles/mm), the longitudinal axis represents the numerical value of a Modulation Transfer Function (MTF), the numerical value of the MTF is used for evaluating the imaging quality of a lens, the value range is 0-1, particularly, the optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother the curve is, the better the imaging quality of the system is, and the stronger the restoring capability to a real image is; as can be seen from fig. 2, when the spatial frequency of the visible light band is 160lp/mm, the MTF of the imaging area near the center is greater than 0.67, the imaging quality is good, and it can be seen from the defocus graph of fig. 3 that the focal depth of the lens is good, the optical lens provided by the specific implementation mode corrects various aberrations, such as spherical aberration, coma, astigmatism, field curvature, chromatic aberration of magnification, chromatic aberration of position, and the like, thereby improving the resolution, and the performance of the lens can reach a resolution of more than 500 ten thousand pixels at night. As can be seen from fig. 2 and 3, the optical lens according to the embodiment of the present invention has corrected and balanced various aberrations to a good level.

Fig. 4 is a relative illumination chart of the embodiment of the invention, and it can be seen from fig. 4 that the maximum relative illumination of the lens is greater than 55%.

FIG. 5 is an optical distortion diagram of the lens according to the embodiment of the present invention, and it can be seen from FIG. 5 that the optical distortion of the lens is controlled to be less than-10%.

According to the invention, 2 glass lenses and 4 plastic lenses are adopted, so that the weight and the volume of the lens are reduced, the manufacturing cost of the lens is reduced, and the research and development period is accelerated; the optical parameters in the optical lens system are well matched with imaging conditions, so that the aberration of the lens system is corrected to a greater extent, the MTF resolution is high, high definition on the whole image surface is ensured, uniform imaging can be realized, the luminous flux at night and the night image pickup effect are improved, in addition, all optical glass lenses adopt aspheric surface design, the cold processing performance of the lenses is good, the glass material cost is low, the price of finished lenses is lower, and the volume production rate is high; all plastic lenses have good processing performance, the research and development period is shortened, and the research and development efficiency is improved.

It should be noted that the above list is only one specific embodiment of the present invention. It is clear that the invention is not limited to the embodiments described above, but that many variations are possible, all of which can be derived or suggested directly from the disclosure of the invention by a person skilled in the art, and are considered to be within the scope of the invention.

Claims

1. The utility model provides a be used for night commercial car to drive big light ring high definition camera lens which characterized in that includes: the lens comprises a meniscus glass lens (E1) with a negative focal length, a plastic aspheric lens (E2) with a positive focal length, a third block lens (E3) with a positive focal length, a diaphragm (ST), a plastic aspheric lens (E4) with a negative focal length, a plastic aspheric lens (E5) with a positive focal length and a plastic aspheric lens (E6) with a positive focal length, wherein the effective focal length of the plastic aspheric lens (E5) with a positive focal length is f5, the plastic aspheric lens (E6) with a positive focal length is f6, and the ratio range of f6 to f5 is 2.5< f6/f5< 5.2.

2. The large-aperture high-definition lens for night commercial vehicle driving as claimed in claim 1, further comprising an optical filter (E7), wherein the plastic aspheric lens with positive focal length (E6) is located between the plastic aspheric lens with positive focal length (E5) and the optical filter (E7).

3. The large-aperture high-definition lens for night commercial vehicle driving as claimed in claim 1, wherein the effective focal length of the meniscus glass lens (E1) with negative focal length is f1, the effective focal length of the plastic aspheric lens (E2) with positive focal length is f2, the effective focal length of the third lens (E3) with positive focal length is f3, the effective focal length of the plastic aspheric lens (E4) with negative focal length is f4, the ratio range of f1 to f3 is-0.58 < f1/f3 < -2.54, and the ratio range of f2 to f4 is-18.2 < f2/f4 < 22.3.

4. The large-aperture high-definition lens for driving of commercial vehicles at night according to claim 1, wherein the third lens (E3) with positive focal length is a double-convex glass lens.

5. The large-aperture high-definition lens for driving of a commercial vehicle at night as claimed in claim 1, wherein the abbe number of the plastic aspheric lens (E2) with positive focal length is less than 30.

6. The large-aperture high-definition lens for driving of a commercial vehicle at night as claimed in claim 1, wherein the abbe number of the plastic aspheric lens (E2) with positive focal length is less than 30.

7. The large-aperture high-definition lens for night commercial vehicle driving as claimed in claim 1, wherein the abbe number of the plastic aspheric lens (E5) with positive focal length and the abbe number of the plastic aspheric lens (E6) with positive focal length are both greater than 50.

8. The large-aperture high-definition lens for driving of a commercial vehicle at night according to claim 1, wherein the refractive index of the third lens (E3) with the positive focal length is greater than 1.70.

9. The large-aperture high-definition lens for driving of a commercial vehicle at night according to claim 1, wherein the refractive index of the plastic aspheric lens (E4) with the negative focal length is greater than 1.60 and less than 1.75.