CN215813516U

CN215813516U - Black light level high-definition optical imaging system

Info

Publication number: CN215813516U
Application number: CN202121275957.9U
Authority: CN
Inventors: 柳振全; 丁翊轩; 李梦幻; 丁松涛
Original assignee: Henan Yixuan Photoelectric Technology Co
Current assignee: Henan Yixuan Photoelectric Technology Co
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2022-02-11
Anticipated expiration: 2031-06-08

Abstract

The utility model provides a black light level high-definition optical imaging system, and belongs to the technical field of optical devices. A black-light-level high-definition optical imaging system comprises twelve lenses and an optical filter, wherein a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and the optical filter are sequentially arranged from an object plane to an image plane along an optical axis. The utility model can realize that the lens has no virtual focus at high and low temperatures, improves the resolving power of the lens, reduces the number of lenses required by the low-light high-definition lens, greatly reduces the cost, and simultaneously realizes that the lens has no virtual focus at high and low temperatures.

Description

Black light level high-definition optical imaging system

Technical Field

The utility model belongs to the technical field of optical devices, and particularly relates to a black light level high-definition optical imaging system.

Background

The intelligent monitoring system is an important component in a traffic information acquisition subsystem in an intelligent transportation system in China, and is accompanied with the development of smart cities. A cell monitoring system taking television camera shooting as a theme is established in most cities in China, and managers monitor emergency events through the system and timely handle safety accidents and implement management of cells and families. Some city monitoring systems can also perform corresponding data conversion according to changes of weather environments to control the camera lens to automatically point to a road crowded or sudden area, and certain intelligent functions are achieved. With the continuous release of various standards and specifications, the industry of intelligent monitoring systems will develop in a more normative and orderly manner. New technical demands are also increasing in development. The high-definition lens and the infrared confocal lens have the advantages of reducing cost and improving the stability of the lens, and become bright spots which are continuously pursued by people. The traditional lens is large in size, the resolution yield of the assembled product is low, and the mass production is difficult. The cost of lens production is high, and the effect in high-end fields is not ideal. The AA-system assembly mode cannot be realized on an IP network machine, and the structural members are classified more.

The utility model CN209014799U discloses black light wide angle prime lens of super large luminous flux, including the first lens that has negative focal power, the second lens that has negative focal power, the third lens that has positive focal power, the fourth lens that has positive focal power, the fifth lens that has negative focal power, the sixth lens that has positive focal power, the seventh lens that has positive focal power, the eighth lens that has negative focal power and the ninth lens that has positive focal power. The black light level is achieved, the temperature compensation function is realized, the coke can not be leaked under the environment of minus 30 ℃ to plus 80 ℃, but the coke can not be leaked at lower temperature, and the resolution is not high.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a black light level high-definition optical imaging system to solve the problems of large volume, low resolving power and high cost of the traditional lens.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

a black-light-level high-definition optical imaging system comprises twelve lenses and an optical filter, wherein a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and the optical filter are sequentially arranged from an object plane to an image plane along an optical axis.

Furthermore, the twelve lenses are all glass spherical lenses.

Furthermore, the focal lengths of the twelve lenses are negative, positive, negative, positive and positive in sequence.

Further, the first lens is a biconvex lens, the second lens is a biconcave lens, the third lens is a biconvex lens, the fourth lens is a meniscus lens, the fifth lens is a meniscus lens, the sixth lens is a biconvex lens, the seventh lens is a biconvex lens, the eighth lens is a biconcave lens, the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, the eleventh lens is a biconvex lens, and the twelfth lens is a meniscus lens.

Furthermore, the fourth lens, the fifth lens and the sixth lens are made of high-refractive-index low-dispersion material lenses.

Furthermore, the seventh lens, the ninth lens and the tenth lens are made of ultra-low dispersion material.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides a black light level high-definition optical imaging system, which is characterized in that through the matching use of twelve glass lenses, the FNO of a lens reaches 1.08, the black light level function of the lens is ensured, the lens does not have virtual focus at high and low temperatures (from high temperature plus 80 ℃ to low temperature minus 40 ℃) through the precise matching of structure and optics, and the aberration of the lens is effectively corrected through optical simulation and multiple adjustment of structural tolerance, so that the resolving power of the lens reaches more than 800 ten thousand pixels.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1: the structure of embodiment 1 of the utility model is schematically shown;

FIG. 2: the spherical aberration curve chart of embodiment 1 of the utility model;

FIG. 3: a field curvature distortion diagram of example 1 of the present invention;

FIG. 4: a vertical axis color difference chart of example 1 of the present invention;

FIG. 5: MTF plot of inventive example 1;

the optical filter comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, a eleventh lens, a twelfth lens and a 13-optical filter, wherein the first lens is 1-the first lens, the second lens is 2-the second lens, the third lens is 3-the fourth lens, the fifth lens is 5-the sixth lens, the sixth lens is 6-the seventh lens, the seventh lens is 7-the eighth lens, the eighth lens is 8-the 9-the ninth lens, the tenth lens is 10-the eleventh lens, the twelfth lens is 12-the eleventh lens and the optical filter is 13-the optical filter.

Detailed Description

In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.

Example 1

As shown in fig. 1, a black-light level high-definition optical imaging system includes twelve lenses, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12 and an optical filter 13 in sequence from an object plane to an image plane along an optical axis.

The twelve lenses are all glass spherical lenses.

The focal lengths of the twelve lenses are negative, positive, negative, positive and positive in sequence. The whole lens is selected and used by the material of the positive and negative focal power lens, and the variation of the positive and negative focal power lens is consistent by combining a mechanical structure, so that the lens has no virtual focus at high and low temperatures (high temperature +80 ℃ to low temperature-40 ℃).

The first lens element 1 is a biconvex lens, the second lens element 2 is a biconcave lens element, the third lens element 3 is a biconvex lens element, the fourth lens element 4 is a meniscus lens element, the fifth lens element 5 is a meniscus lens element, the sixth lens element 6 is a biconvex lens element, the seventh lens element 7 is a biconvex lens element, the eighth lens element 8 is a biconcave lens element, the ninth lens element 9 is a biconvex lens element, the tenth lens element 10 is a meniscus lens element, the eleventh lens element 11 is a biconvex lens element, and the twelfth lens element 12 is a meniscus lens element.

The fourth lens 4, the fifth lens 5 and the sixth lens 6 are made of high refractive index and low dispersion material. The fifth lens 5 and the sixth lens 6 are made of high-refractive-index low-dispersion material lenses, and reasonable optical structures are selected. The lens can effectively correct aberrations such as spherical aberration, coma aberration, astigmatism, field curvature and the like, thereby improving the resolution quality of the lens and achieving ideal resolution. Meanwhile, the number of used lenses is reduced, and therefore the total length of the lens is reduced. The aperture of the lens is increased, which brings the increase of spherical aberration and coma. Fourth lens 4 and fifth lens 5 adopt the low dispersion material lens of high refracting index, can effectively rectify spherical aberration and coma for the residual spherical aberration and the coma of camera lens are less.

The seventh lens element 7, the ninth lens element 9 and the tenth lens element 10 are made of ultra-low dispersion material. The seventh lens 7, the ninth lens 9 and the tenth lens 10 are made of ultra-low dispersion material lenses, and can effectively correct chromatic spherical aberration and secondary spectral chromatic aberration, so that the function of a black level is ensured.

Under the traditional low-light-level lens, virtual focus does not exist in the high-low temperature (high temperature +80 ℃ and low temperature-40 ℃), the total number of glass lenses reaches more than 16, and the lens uses high-refractive-index low-dispersion glass lenses and ultra-low-dispersion glass lenses, so that the number of the used lens lenses is reduced to 12, and the cost is greatly reduced. Meanwhile, the number of the lens lenses is reduced from the previous 16 lenses to 12 lenses, so that the space of 4 lenses is reduced, and the space occupied by the optical component is reduced. And finally, the optical total length of the lens is reduced to be within 66mm through the correction of the optical design.

The radius, thickness and material of the lens are explained below.

Table 1:

in table 1:

the

surface numbers

1 and 2 respectively represent the first surface and the second surface of the first lens 1, and the material of the first lens 1 is H-ZLAF50 e;

surface numbers

3 and 4 respectively indicate a first surface and a second surface of the second lens 2, and the material of the second lens 2 is H-ZK 3;

surface numbers 5 and 6 respectively indicate a first surface and a second surface of the third lens 3, and the material of the third lens 3 is H-ZF 52;

surface numbers 6 and 7 respectively indicate a first surface and a second surface of the fourth lens element 4, and the fourth lens element 4 is made of FCD 515;

surface numbers 8 and 9 respectively indicate a first surface and a second surface of the fifth lens 5, and the fifth lens 5 is made of TAFD 55;

surface numbers 10 and 11 respectively indicate the first surface and the second surface of the sixth lens 6, and the material of the sixth lens 6 is TAFD 55;

surface numbers 13 and 14 respectively indicate a first surface and a second surface of the seventh lens 7, and the material of the seventh lens 7 is FCD 515;

surface numbers 14 and 15 respectively indicate a first surface and a second surface of the eighth lens 8, and the eighth lens 8 is made of H-ZF 4;

surface numbers 16 and 17 respectively indicate a first surface and a second surface of the ninth lens 9, and the ninth lens 9 is made of H-FK 61;

surface numbers 17 and 18 respectively indicate a first surface and a second surface of the tenth lens 10, and the tenth lens 10 is made of H-ZF 52;

surface numbers 19 and 20 respectively indicate a first surface and a second surface of the eleventh lens 11, and the eleventh lens 11 is made of FCD 515;

surface numbers 21 and 22 respectively indicate a first surface and a second surface of the twelfth lens 12, and the twelfth lens 12 is made of H-ZLAF 76;

the first surface is a surface facing the object surface side, and the second surface is a surface facing the image surface side.

Fig. 2 is a spherical aberration curve chart of the present embodiment 1, in which the spherical aberration of the lens is corrected to within ± 0.03mm, and the spherical aberration is better corrected within the spectral bandwidth, so as to increase the smoothness of the real shot image of the lens.

Fig. 3 is a field curvature distortion diagram of the present embodiment 1, and since an aspheric lens is used, astigmatism and field curvature are corrected to a proper range, so that the resolution in the meridional direction can be close to that in the sagittal direction.

FIG. 4 is a vertical axis chromatic aberration diagram of embodiment 1, and the relative vertical axis chromatic aberration of the f light, the d light and the c light is within 3.5 μm, which satisfies our requirements for the resolution quality of the lens.

Fig. 5 is an MTF graph of this embodiment 1, which shows that the lens has excellent resolution, and has a spatial frequency of 160cycles/mm within the central field and 0.7 field, and has a high sharpness.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A black-light-level high-definition optical imaging system comprises twelve lenses and an optical filter, and is characterized in that a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and the optical filter are arranged along an optical axis from an object plane to an image plane in sequence.

2. A black-light level high-definition optical imaging system as claimed in claim 1, wherein said twelve lenses are all glass spherical lenses.

3. A black-light level high-definition optical imaging system as claimed in claim 1, wherein the focal lengths of the twelve lenses are negative, positive, negative, positive, and positive in sequence.

4. The system according to claim 1, wherein the first lens element is a biconvex lens element, the second lens element is a biconcave lens element, the third lens element is a biconvex lens element, the fourth lens element is a meniscus lens element, the fifth lens element is a meniscus lens element, the sixth lens element is a biconvex lens element, the seventh lens element is a biconcave lens element, the eighth lens element is a biconvex lens element, the tenth lens element is a meniscus lens element, the eleventh lens element is a biconvex lens element, and the twelfth lens element is a meniscus lens element.

5. A black-light level high-definition optical imaging system as claimed in claim 1, wherein said fourth lens, said fifth lens and said sixth lens are made of high refractive index low dispersion material.

6. A black-light level high-definition optical imaging system as claimed in claim 1, wherein said seventh lens element, said ninth lens element and said tenth lens element are made of ultra-low dispersion material.