CN113484986B - Low-cost black light security protection camera lens - Google Patents
Low-cost black light security protection camera lens Download PDFInfo
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- CN113484986B CN113484986B CN202110725461.5A CN202110725461A CN113484986B CN 113484986 B CN113484986 B CN 113484986B CN 202110725461 A CN202110725461 A CN 202110725461A CN 113484986 B CN113484986 B CN 113484986B
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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Abstract
The invention discloses a low-cost black light security lens, which comprises a first lens L1 with convex-concave negative focal power, a second lens L2 with convex-concave positive focal power, a third lens L3 with convex-concave negative focal power, a fourth lens L4 with double convex positive focal power, a fifth lens L5 with convex-concave negative focal power, a sixth lens L6 with double convex positive focal power and a seventh lens L7 with convex-concave negative focal power, which are sequentially arranged along the light incidence direction, and the following conditions are met: f is less than or equal to 1.06, wherein F is the F-number. The lens can realize large aperture, can form clear color images in day and night, correct aberration and chromatic aberration, has no offset of focal plane at-40-80 ℃, small volume, low cost and high image quality, and is suitable for low-illumination and all-weather monitoring.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a low-cost black light security lens.
Background
For all-weather monitoring requirements, a lens capable of imaging day and night is needed, visible light imaging is utilized in the day, near-infrared supplementary lighting is added at night for black and white imaging, the monitoring lens is the mainstream of the monitoring lens on the market, most of light rings are small at present, so that the lens is less in light transmission, images obtained under a low-illumination scene are darker, and the image quality is difficult to guarantee. With the continuous development of the market, the requirement of black light full-color night vision is put forward for the security lens, and the requirements of high definition and miniaturization are promoted, so that the lens is required to achieve higher performance and smaller volume, and therefore, the lens with a large aperture is produced. The larger aperture represents a larger caliber, and can capture weak starlight at night to realize color imaging without near-infrared light supplement. Meanwhile, a larger aperture also represents the increase of the design difficulty and cost of the lens, and in the prior art, more lenses are usually selected for implementation, for example, a black light lens with the patent application number of 202011127819.6 adopts eight lenses, a black light lens with the patent application number of 202011127820.9 adopts nine lenses, and due to the increase of the number of the lenses, more glass lenses or aspheric lenses are usually provided, which leads to the increase of the design difficulty and cost. Therefore, it is necessary to design a low-cost black light lens.
Disclosure of Invention
The invention aims to solve the problems, provides a low-cost black light security lens which can form clear color images in the day and at night, realizes large aperture through fewer lenses, further corrects aberration and chromatic aberration, does not deviate in focal plane within-40-80 ℃, ensures high-definition image quality, is small in size, low in cost, convenient to assemble, and suitable for low-illumination and all-weather monitoring.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a low-cost black light security lens, which comprises a first lens L1 with convex-concave negative focal power, a second lens L2 with convex-concave positive focal power, a third lens L3 with convex-concave negative focal power, a fourth lens L4 with double convex positive focal power, a fifth lens L5 with convex-concave negative focal power, a sixth lens L6 with double convex positive focal power and a seventh lens L7 with convex-concave negative focal power, which are sequentially arranged along the light incidence direction, and the following conditions are met:
F≤1.06
wherein F is the F-number.
Preferably, the low-cost black light security lens meets the following conditions:
f≤6.31mm，TTL≤22.4mm
wherein f is the effective focal length of the lens, and TTL is the total optical length of the lens.
Preferably, the fourth lens L4 is a glass spherical lens, and the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspheric lenses.
Preferably, the fourth lens L4 satisfies:
R 7 ≤11mm，R 8 ≥-12mm，f4≤12mm
wherein R is 7 Is the object side curvature radius, R, of the fourth lens element L4 8 Is the image-side curvature radius of the fourth lens L4, and f4 is the focal length of the fourth lens L4.
Preferably, the fourth lens L4 further satisfies:
1.5≤n4≤1.65，65≤v4≤75
where n4 is a refractive index of the fourth lens L4, and v4 is an abbe number of the fourth lens L4.
Preferably, the refractive indexes of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7, which correspond to each other in sequence, have ranges of 1.53 ± 5%, 1.63 ± 5%, 1.53 ± 5% and 1.63 ± 5%, respectively.
Preferably, a diaphragm is disposed between the first lens L1 and the second lens L2.
Preferably, the aspheric equations of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 each satisfy the following formula:
wherein Z is rise, c is curvature, y is radial coordinate, k is conic coefficient, alpha 4 、α 6 、α 8 、α 10 、α 12 Are aspheric high order coefficients.
Preferably, the values of k of the mirror surfaces distributed along the light incidence direction on the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 correspond to-0.555, -1.461, -2.224, -2.757, -0.027, -13.922, -3.322, -13.152, -3.126, -3.929, -3.523 and-7.613, and alpha is 4 The values are sequentially corresponding to-2.3 e-3, 6.91e-3, 1.03e-3, -1.1e-3, 4.4e-3, -1.1e-3, 4.18e-3, 2.63e-3, -3.3e-5, 2.94e-4, 1.66e-3, 1.1e-3, alpha 6 Values of which are sequentially corresponding to-2.6 e-4, -8.8e-4, 7.9e-4, -3.6e-4, 3.37e-4, 2.14e-4, -2.7e-4, 4.22e-4, 1.85e-5, -2.5e-4, 3.35e-4, 6.76e-4, alpha 8 Values sequentially correspond to-4.7 e-6, 4.46e-6, 7.21e-5, 4.66e-5, -2.1e-5, -1.3e-5, 7.23e-6, -1.4e-5, 3.64e-6, 2.89e-5, -5.6e-5, -6.1e-5, alpha 10 The values are sequentially corresponding to-2.78 e-7, 1.96e-6, 6e-6, -4.4e-6, 9.88e-6, 6.03e-7, 5.63e-7, 9.57e-6, 3.93e-7, -1.4e-6, 3.05e-6, 1.3e-6, alpha 12 The values are sequentially corresponding to 3.29e-8, 2.41e-8, 2.68e-7, 2.48e-7, -1.8e-7, -1.6e-8, -2.3e-8, -5 e-7-1.4e-8、4.27e-8、-3.6e-7、9.79e-8。
Compared with the prior art, the invention has the beneficial effects that:
1) The lens realizes a large aperture through fewer lenses, the F-number is below 1.06, full-color imaging in a low-light environment at day and night can be realized, the definition is higher than near-infrared black-and-white imaging, the size is small, the cost is low, the assembly is convenient, and the lens is suitable for low-illumination and all-weather monitoring, such as road traffic, residential corridor and the like;
2) The lens is further used for aberration correction, the outer diameter of the lens is reduced, the total length is compressed, and only one glass spherical surface is used for aberration correction, so that the lens meets the requirements, and the cost of glass processing and materials is reduced;
3) The reasonable matching of focal power and material ensures that the focal plane does not deviate within-40 ℃ to 80 ℃ and ensures high image quality.
Drawings
Fig. 1 is a schematic view of a lens structure according to a first embodiment of the invention;
FIG. 2 is a MTF curve under the environment of 20 ℃ at normal temperature in accordance with an embodiment of the present invention;
FIG. 3 is a defocus graph under a normal temperature and 20 ℃ environment in accordance with an embodiment of the present invention;
FIG. 4 is a defocus graph under a low temperature-40 deg.C environment according to an embodiment of the present invention;
FIG. 5 is a defocus graph under a high temperature of 80 ℃ in an embodiment of the present invention;
fig. 6 is a schematic view of a lens structure according to a second embodiment of the present invention;
FIG. 7 is a MTF curve of the second embodiment of the present invention at room temperature and 20 ℃;
FIG. 8 is a defocus graph at 20 ℃ in the second embodiment of the present invention;
FIG. 9 is a defocus graph in a low temperature-40 deg.C environment according to the second embodiment of the present invention;
FIG. 10 is a defocus graph in an environment of 80 ℃ at a high temperature in accordance with the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that, 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. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
A low-cost black light security lens comprises a first lens L1 with convex-concave negative focal power, a second lens L2 with convex-concave positive focal power, a third lens L3 with convex-concave negative focal power, a fourth lens L4 with double convex positive focal power, a fifth lens L5 with convex-concave negative focal power, a sixth lens L6 with double convex positive focal power and a seventh lens L7 with convex-concave negative focal power, which are sequentially arranged along the light incidence direction, and the following conditions are met:
F≤1.06
wherein F is the F-number.
In one embodiment, the low-cost black light security lens meets the following conditions:
f≤6.31mm，TTL≤22.4mm
wherein f is the effective focal length of the lens, and TTL is the total optical length of the lens.
The large aperture is realized through seven lenses, the F-number F is less than 1.06, the smaller the F-number F is, the larger aperture and light-transmitting aperture are represented, so that the lens can collect light rays to perform color imaging under the environment of weak light at night without near-infrared light supplement, full-color imaging under the environments of weak light at day and night can be realized, and the definition is higher than near-infrared black-and-white imaging. The shapes of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are configured, air intervals are reasonably restricted, the effective focal length and the total length of the lens are kept while high image quality is achieved, the structure of the lens is more compact, the focal plane is not deviated within-40-80 ℃ through reasonably matching positive and negative focal powers, the number of the lenses is small, one-end assembly is convenient to adopt, and the assembly efficiency is high. The lens has high image quality, small volume, low cost and convenient assembly, and is suitable for all-weather monitoring with low illumination, such as road traffic, residential corridor and the like.
In an embodiment, the fourth lens element L4 is a glass spherical lens element, and the first lens element L1, the second lens element L2, the third lens element L3, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are all plastic aspheric lens elements.
The lens adopts a 1G6P framework, aberration is corrected through six plastic aspheric lenses, the outer diameter and the total length of the lens are reduced, meanwhile, only one glass spherical lens is used for correcting aberration and maintaining the stability of the lens at high and low temperatures, so that the lens meets the requirements, the use of glass materials is reduced as far as possible, and the cost of glass processing and materials is reduced.
In an embodiment, by reasonably distributing the focal length of the fourth lens element L4 and the curvature radius of each mirror surface, the correction of chromatic aberration is facilitated, the lens is ensured to have a higher resolving power, and the fourth lens element L4 satisfies:
R 7 ≤11mm，R 8 ≥-12mm，f4≤12mm
wherein R is 7 Is the object side curvature radius, R, of the fourth lens element L4 8 Is the radius of curvature of the image-side surface of the fourth lens L4, and f4 is the focal length of the fourth lens L4.
In an embodiment, the fourth lens L4 further satisfies:
1.5≤n4≤1.65，65≤v4≤75
where n4 is a refractive index of the fourth lens L4, and v4 is an abbe number of the fourth lens L4.
The fourth lens L4 is made of a heavy phosphorus crown glass material with a high Abbe number and a high refractive index, the chromatic aberration is corrected, the spherical aberration can be well balanced, and the thermal temperature coefficient of the material is beneficial to the athermalization of the lens.
In an embodiment, in order to further ensure that the focal plane of the lens does not deviate within-40 ℃ to 80 ℃ and realize high-definition image quality, the value ranges of the sequentially corresponding refractive indexes of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are respectively 1.53 ± 5%, 1.63 ± 5%, 1.53 ± 5% and 1.63 ± 5%.
In one embodiment, a stop is disposed between the first lens L1 and the second lens L2. The luminous flux can be adjusted according to actual requirements to obtain the best imaging effect.
In one embodiment, the aspheric equations of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 all satisfy the following equations:
wherein Z is rise, c is curvature, y is radial coordinate, k is conic coefficient, alpha 4 、α 6 、α 8 、α 10 、α 12 Are aspheric high order coefficients.
The following detailed description is given by way of preferred embodiments.
Example 1:
as shown in fig. 1-5, fig. 1 is a schematic view of a low-cost black-light security lens in this embodiment, a fourth lens L4 is a glass spherical lens, and a first lens L1, a second lens L2, a third lens L3, a fifth lens L5, a sixth lens L6, and a seventh lens L7 are all plastic aspheric lenses, and specific values of optical parameters of the lenses in this embodiment are shown in table 1, including a curvature radius, a thickness, a refractive index of a material, an abbe number, and a focal length.
TABLE 1
The number of the mirror surfaces of each lens is sequentially from the incident direction of light, i.e., from the object plane to the image plane, R1 is the object side surface of the first lens L1, R2 is the image side surface of the first lens L1, R3 is the object side surface of the second lens L2, R4 is the image side surface of the second lens L2, R5 is the object side surface of the third lens L3, R6 is the image side surface of the third lens L3, R7 is the object side surface of the fourth lens L4, R8 is the image side surface of the fourth lens L4, R9 is the object side surface of the fifth lens L5, R10 is the image side surface of the fifth lens L5, R11 is the object side surface of the sixth lens L6, R12 is the image side surface of the sixth lens L6, R13 is the object side surface of the seventh lens L7, R14 is the image side surface of the seventh lens L7, and "-" indicates that the mirror surfaces are curved toward the image plane.
Specific aspheric parameters of each lens in this embodiment are shown in table 2.
TABLE 2
| Mirror surface | k | α 4 | α 6 | α 8 | α 10 | α 12 |
| R1 | -0.555 | -2.3e-3 | -2.6e-4 | -4.7e-6 | -2.78e-7 | 3.29e-8 |
| R2 | -1.461 | 6.91e-3 | -8.8e-4 | 4.46e-6 | 1.96e-6 | 2.41e-8 |
| R3 | -2.224 | 1.03e-3 | 7.9e-4 | 7.21e-5 | 6e-6 | 2.68e-7 |
| R4 | -2.757 | -1.1e-3 | -3.6e-4 | 4.66e-5 | -4.4e-6 | 2.48e-7 |
| R5 | -0.027 | 4.4e-3 | 3.37e-4 | -2.1e-5 | 9.88e-6 | -1.8e-7 |
| R6 | -13.922 | -1.1e-3 | 2.14e-4 | -1.3e-5 | 6.03e-7 | -1.6e-8 |
| R9 | -3.322 | 4.18e-3 | -2.7e-4 | 7.23e-6 | 5.63e-7 | -2.3e-8 |
| R10 | -13.152 | 2.63e-3 | 4.22e-4 | -1.4e-5 | 9.57e-6 | -5e-7 |
| R11 | -3.126 | -3.3e-5 | 1.85e-5 | 3.64e-6 | 3.93e-7 | -1.4e-8 |
| R12 | -3.929 | 2.94e-4 | -2.5e-4 | 2.89e-5 | -1.4e-6 | 4.27e-8 |
| R13 | -3.523 | 1.66e-3 | 3.35e-4 | -5.6e-5 | 3.05e-6 | -3.6e-7 |
| R14 | -7.613 | 1.1e-3 | 6.76e-4 | -6.1e-5 | 1.3e-6 | 9.79e-8 |
According to the above data, the F number of the lens in this embodiment is 1.03, the effective focal length is 6.19mm, the total length is 22.3mm, the image quality assurance image plane range Φ =6.6mm, and the maximum image plane range Φ =7mm. As shown in FIG. 2, the MTF curves in the fields are all gradually decreased, the MTF value of the central field reaches 0.49 at 250lp/mm, the MTF value of the edge field is greater than 0.25 at 250lp/mm line pair, and the lens imaging effect and the resolution are good. As shown in the defocusing curves of figures 3, 4 and 5, in the lens under the environment of normal temperature of 20 ℃, low temperature of-40 ℃ and high temperature of 80 ℃, the curves under each field are concentrated, the defocusing is small, the maximum field is defocused by 0.004mm, and the lens is not defocused in the temperature change of-40 ℃ to 80 ℃.
Example 2:
as shown in fig. 6-10, fig. 6 is a schematic view of a low-cost black-light security lens in this embodiment, the fourth lens L4 is a glass spherical lens, and the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspheric lenses, and specific values of optical parameters of each lens in this embodiment are shown in table 3, including a curvature radius, a thickness, a refractive index of a material, an abbe number, and a focal length.
TABLE 3
The number of the mirror surfaces of each lens is sequentially from the incident direction of light, i.e., from the object plane to the image plane, R1 is the object side surface of the first lens L1, R2 is the image side surface of the first lens L1, R3 is the object side surface of the second lens L2, R4 is the image side surface of the second lens L2, R5 is the object side surface of the third lens L3, R6 is the image side surface of the third lens L3, R7 is the object side surface of the fourth lens L4, R8 is the image side surface of the fourth lens L4, R9 is the object side surface of the fifth lens L5, R10 is the image side surface of the fifth lens L5, R11 is the object side surface of the sixth lens L6, R12 is the image side surface of the sixth lens L6, R13 is the object side surface of the seventh lens L7, R14 is the image side surface of the seventh lens L7, and "-" indicates that the mirror surfaces are curved toward the image plane.
Specific aspheric parameters of each lens in this embodiment are shown in table 4.
TABLE 4
| Mirror surface | k | α 4 | α 6 | α 8 | α 10 | α 12 |
| R1 | -0.539 | -2.6E-3 | -2.6e-4 | 1.59e-6 | 2.94e-7 | 5.44e-8 |
| R2 | -1.446 | 5.58e-3 | -8e-4 | 2.19e-5 | 1.29e-6 | -6.7e-7 |
| R3 | -2.449 | 1.23E-4 | -9.1e-4 | -8.89e-5 | -4.4e-6 | 5.92e-8 |
| R4 | -2.540 | -2e-4 | -5.4e-4 | 5.67e-5 | -3.2e-6 | 1.24e-7 |
| R5 | -0.084 | 5.2e-3 | 3.84e-4 | -2e-5 | 8.27e-6 | -2e-7 |
| R6 | -15.055 | -6e-4 | 1.34e-4 | 1.2e-5 | -7.58-6 | -2.1e-7 |
| R9 | -1.49 | 3.54e-3 | -2.7e-4 | 6.61e-6 | 4.45e-7 | -2.1e-8 |
| R10 | -6.997 | -1e-3 | 8.24e-4 | -1.2e-5 | 9.31e-6 | -2.2e-7 |
| R11 | -3.509 | 1.68e-3 | -5.6e-5 | 7.01e-7 | 2.52e-7 | -1.8e-8 |
| R12 | -2.029 | 6.8e-4 | -1.5e-4 | 2.07e-5 | -9.2e-7 | 4.71e-8 |
| R13 | -2.394 | -1.8e-3 | 5.19e-4 | -3.8e-5 | 1.43e-6 | -1.8e-7 |
| R14 | -100 | -9e-4 | 5.76e-4 | -3.5e-5 | 8.59e-6 | -7e-8 |
According to the above data, the F number of the lens in this embodiment is 1.05, the effective focal length is 6.31mm, the total length is 22.4mm, the image quality guarantee image plane range Φ =6.6mm, and the maximum image plane range Φ =7mm. As shown in fig. 7, the MTF curves in the fields are all decreased smoothly, the MTF value of the central field reaches 0.5 at 250lp/mm, the MTF value of the edge field is greater than 0.25 at 250lp/mm line pair, and the imaging effect and the resolution of the lens are good. As shown in the defocusing curves of FIGS. 8, 9 and 10, in the lens under the environment of normal temperature of 20 ℃, low temperature of-40 ℃ and high temperature of 80 ℃, the curves under each field are concentrated, the defocusing is small, the maximum field is defocused by 0.004mm, and the lens is not defocused in the temperature change of-40 ℃ to 80 ℃.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express the more specific and detailed embodiments described in the present application, but should not be understood as the limitation of the invention scope. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The utility model provides a low-cost black light security protection camera lens which characterized in that: the low-cost black-light security lens consists of a first lens L1 with convex-concave negative focal power, a second lens L2 with convex-concave positive focal power, a third lens L3 with convex-concave negative focal power, a fourth lens L4 with double convex positive focal power, a fifth lens L5 with convex-concave negative focal power, a sixth lens L6 with double convex positive focal power and a seventh lens L7 with convex-concave negative focal power which are sequentially arranged along the light incidence direction, and the following conditions are met:
F≤1.06
wherein F is the F-number;
the fourth lens L4 satisfies:
R 7 ≤11mm，R 8 ≥-12mm，f4≤12mm，
1.5≤n4≤1.65，65≤v4≤75
wherein R is 7 Is the object side curvature radius, R, of the fourth lens element L4 8 F4 is a focal length of the fourth lens L4, n4 is a refractive index of the fourth lens L4, and v4 is an abbe number of the fourth lens L4.
2. The low-cost black light security lens of claim 1, wherein: the low-cost black light security lens meets the following conditions:
f≤6.31mm，TTL≤22.4mm
wherein f is the effective focal length of the lens, and TTL is the total optical length of the lens.
3. The low-cost black light security lens of claim 1, characterized in that: the fourth lens L4 is a glass spherical lens, and the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspheric lenses.
4. The low-cost black light security lens of claim 1, wherein: the refractive index value ranges of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 which correspond to each other in sequence are respectively 1.53 +/-5%, 1.63 +/-5%, 1.53 +/-5% and 1.63 +/-5%.
5. The low-cost black light security lens of claim 1, wherein: and a diaphragm is arranged between the first lens L1 and the second lens L2.
6. The low-cost black light security lens as claimed in any one of claims 1 to 5, wherein: the aspheric equations of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 all satisfy the following formulas:
wherein Z is rise, c is curvature, y is radial coordinate, k is conic coefficient, alpha 4 、α 6 、α 8 、α 10 、α 12 Are aspheric high order coefficients.
7. As claimed in claim 6Cost black light security protection camera lens, its characterized in that: the values of k of the mirror surfaces distributed along the light incidence direction on the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are respectively-0.555, -1.461, -2.224, -2.757, -0.027, -13.922, -3.322, -13.152, -3.126, -3.929, -3.523 and-7.613, and alpha is 4 Values sequentially correspond to-2.3 e-3, 6.91e-3, 1.03e-3, -1.1e-3, 4.4e-3, -1.1e-3, 4.18e-3, 2.63e-3, -3.3e-5, 2.94e-4, 1.66e-3, 1.1e-3, alpha 6 The values are sequentially corresponding to-2.6 e-4, -8.8e-4, 7.9e-4, -3.6e-4, 3.37e-4, 2.14e-4, -2.7e-4, 4.22e-4, 1.85e-5, -2.5e-4, 3.35e-4, 6.76e-4, alpha 8 The values are sequentially corresponding to-4.7 e-6, 4.46e-6, 7.21e-5, 4.66e-5, -2.1e-5, -1.3e-5, 7.23e-6, -1.4e-5, 3.64e-6, 2.89e-5, -5.6e-5, -6.1e-5, alpha 10 The values are sequentially corresponding to-2.78 e-7, 1.96e-6, 6e-6, -4.4e-6, 9.88e-6, 6.03e-7, 5.63e-7, 9.57e-6, 3.93e-7, -1.4e-6, 3.05e-6, 1.3e-6, alpha 12 The values are sequentially corresponding to 3.29e-8, 2.41e-8, 2.68e-7, 2.48e-7, -1.8e-7, -1.6e-8, -2.3e-8, -5e-7, -1.4e-8, 4.27e-8, -3.6e-7 and 9.79e-8.
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