CN114355578A - Fixed focus lens - Google Patents
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- CN114355578A CN114355578A CN202210147151.4A CN202210147151A CN114355578A CN 114355578 A CN114355578 A CN 114355578A CN 202210147151 A CN202210147151 A CN 202210147151A CN 114355578 A CN114355578 A CN 114355578A
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- 230000003287 optical effect Effects 0.000 claims abstract description 39
- 239000011521 glass Substances 0.000 claims abstract description 26
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 15
- 238000003384 imaging method Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 11
- 235000012149 noodles Nutrition 0.000 description 4
- 230000004304 visual acuity Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003331 infrared imaging Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
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Abstract
The invention relates to a fixed focus lens in the technical field of optical systems, which comprises: the optical lens comprises a first lens (L1) with negative focal power, a second lens (L2) with negative focal power, a diaphragm (STO), a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with positive focal power, a sixth lens (L6) with negative focal power and flat protective glass (CG), wherein the first lens (L1) with negative focal power, the second lens (L2) with negative focal power, the third lens (L3) with positive focal power, the fifth lens (L5) with positive focal power, the sixth lens (L6) with negative focal power and the flat protective glass (CG) are sequentially arranged along the direction from the object side to the image side along an optical axis, and the optical back focal length BFL of the fixed-focus lens and the effective focal length F of the fixed-focus lens satisfy the following relation: BFL/F is more than or equal to 1.49 and less than or equal to 1.51. The fixed-focus lens provided by the invention realizes miniaturization, low cost, high pixel, FNO (fast Fourier transform) less than or equal to 1.64, high resolution of 600 ten thousand pixels, infrared band monitoring function, day and night dual-purpose, clear imaging and security monitoring fixed-focus lens without virtual focus within the temperature range of-40-80 ℃.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a fixed-focus lens.
Background
Along with the improvement of the attention degree of people to the work in the public safety field, the requirements and the imaging quality of security and protection type fixed-focus lenses such as monitoring facilities and the like are also higher. The fixed focus lens occupies an important position in the field of security monitoring industry due to the advantages of high imaging definition, clear imaging under low illumination and the like.
The existing security lens can adopt a dual-band confocal technology to realize the monitoring of day and night, and in order to realize the purpose, the offset of the infrared focus of the lens needs to be within the focal depth range of infrared light. However, the infrared imaging cannot guarantee real color information, so that the infrared clear imaging is guaranteed, and the problem that needs to be solved urgently in the security monitoring field is solved.
Chinese patent CN108333712B discloses an optical image system, an image capturing device and an electronic device. The optical image system sequentially includes, from an object side to an image side, a first lens element, a second lens element, a diaphragm, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a filter element and a flat glass, wherein the second lens element has negative refractive power, and has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The third lens element with positive refractive power. The fourth lens element with positive refractive power. The fifth lens element with positive refractive power. The sixth lens element with negative refractive power. When the special conditions are met, the characteristics of enough visual angle, miniaturization, environmental change resistance and high imaging quality can be achieved. However, the above-mentioned technology does not solve the problem that the infrared imaging of the lens cannot guarantee the real color information.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a security monitoring fixed-focus lens which is miniaturized, has low cost and high pixel, has high resolution of 600 ten thousand pixels, has an infrared band monitoring function and does not have virtual focus within the temperature range of-40-80 ℃.
To achieve the above object, the present invention provides a fixed focus lens, comprising: the optical lens assembly comprises a first lens with negative focal power, a second lens with negative focal power, a diaphragm, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a plate protective glass which are sequentially arranged along the direction from the object side to the image side along the optical axis.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first lens and the third lens are both convex and concave lenses;
the second lens is a concave-convex lens;
the fourth lens and the fifth lens are both convex lenses;
the sixth lens is concave-convex in shape at the paraxial region.
According to an aspect of the present invention, the first lens, the second lens, the third lens, the fifth lens, and the sixth lens are all aspheric lenses;
the fourth lens is a spherical lens.
According to an aspect of the present invention, the first lens, the second lens, the third lens, the fifth lens and the sixth lens are all plastic lenses;
the fourth lens is a glass lens.
According to one aspect of the present invention, the fixed focus lens includes at least one low dispersion glass lens, and the abbe number of the fourth lens is greater than 90.
According to one aspect of the present invention, the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the following relation: TTL/F is more than or equal to 5.85 and less than or equal to 5.92.
According to one aspect of the present invention, the optical back focal length BFL of the fixed-focus lens and the effective focal length F of the fixed-focus lens satisfy the relation: BFL/F is more than or equal to 1.49 and less than or equal to 1.51.
According to an aspect of the present invention, the sum of the effective focal length F1 of the first lens, the effective focal length F2 of the second lens, and the effective focal length F of the prime lens satisfy the relation: -20.03 ≦ (F1+ F2)/F ≦ -13.42.
According to an aspect of the invention, the thickness d1 of the first lens satisfies the relation: d1 is more than or equal to 0.78 and less than or equal to 1.28.
According to one aspect of the invention, the effective focal length F2 of the second lens and the effective focal length F3 of the third lens satisfy the relation: F3/F2 of-1.72 is not less than-1.31.
According to an aspect of the present invention, an effective focal length F3 of the third lens and an effective focal length F of the prime lens satisfy the relation: 15.92 is less than or equal to F3/F is less than or equal to 24.08.
According to an aspect of the present invention, an effective focal length F4 of the fourth lens and an effective focal length F of the prime lens satisfy the relation: F4/F is more than or equal to 2.05 and less than or equal to 2.10.
According to an aspect of the present invention, the effective focal length F of the prime lens and the sum of the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy the relation: -0.70 ≦ (F5+ F6)/F ≦ -0.67.
According to the scheme provided by the invention, the security monitoring fixed focus lens which realizes miniaturization, low cost, high pixel, FNO (fast Fourier transform) less than or equal to 1.64, high resolution of 600 ten thousand pixels, infrared band monitoring function and no virtual focus in the temperature range of-40-80 ℃ is provided, the imaging is clear, and the security monitoring fixed focus lens is suitable for high and low temperature environment conditions. In the aspect of infrared performance, the infrared band performance of the lens is good, and the lens can be used for day and night. In addition, the glass is moulded the lens of different materials and is used mixedly, effectively reduce cost, miniaturization when realizing high resolving power. The total optical length TTL of the lens is less than or equal to 22.45mm (with flat protective glass), and the small volume is further ensured.
Drawings
Fig. 1 is a schematic structural view of a fixed focus lens according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a fixed-focus lens according to embodiment 2 of the present invention;
fig. 3 schematically shows a schematic structural diagram of a fixed-focus lens according to embodiment 3 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, the fixed-focus lens of the present invention includes: a first lens L1 having negative power, a second lens L2 having negative power, a stop STO, a third lens L3 having positive power, a fourth lens L4 having positive power, a fifth lens L5 having positive power, a sixth lens L6 having negative power, and a flat protective glass CG, which are arranged in this order from the object side to the image side along the optical axis.
In the direction from the object side to the image side along the optical axis, the first lens L1 and the third lens L3 are both lenses having a convex-concave shape, the second lens L2 is a lens having a concave-convex shape, the fourth lens L4 and the fifth lens L5 are both lenses having a convex-convex shape, and the sixth lens L6 is a lens having a concave-convex shape at the paraxial region.
The optical structure of the fixed-focus lens of the invention combines and matches the lens with positive and negative focal power and the lenses with different shapes in the way, so that the aberration of the lens is well corrected, and a good infrared imaging effect is achieved, meanwhile, a diaphragm STO is arranged between the second lens L2 and the third lens L3, and a flat protective glass CG is arranged between the image side surface of the sixth lens L6 and the image surface IMA, so that the astigmatism of the optical system of the lens can be controlled, further the miniaturization is realized, the high-resolution performance of 600 ten thousand pixels and the compatibility of day and night dual-purpose performance are realized, and the fixed-focus lens has the infrared band monitoring function, and can clearly image in the temperature range of minus 40 ℃ to plus 80 ℃.
The first lens L1, the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all aspheric lenses, and the fourth lens L4 is a spherical lens.
The first lens L1, the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all plastic lenses, and the fourth lens L4 is a glass lens. In the optical structure of 6 pieces of lenses of this prime lens, 5 pieces of lenses all adopt plastic aspheric lens, and 1 piece of lens is glass spherical lens, through the lens of rationally setting up plastic material, glass material, the lens complementation of different materials has overcome plastic material aspheric lens's the coefficient of expansion big, cause the defect that the focus drifts easily under high low temperature's change environment, can guarantee the realization low cost when the high image quality of camera lens is imaged.
In the invention, the total optical length TTL of the fixed-focus lens and the effective focal length F of the fixed-focus lens satisfy the relation: TTL/F is more than or equal to 5.85 and less than or equal to 5.92. The total optical length TTL refers to the total optical length of the prime lens including the plate cover glass CG. The optical back focal length BFL of the fixed-focus lens and the effective focal length F of the fixed-focus lens satisfy the relation: BFL/F is more than or equal to 1.49 and less than or equal to 1.51. The optical back focal length BFL refers to a distance between an image side surface of the last lens of the fixed-focus lens, i.e., the sixth lens L6, and the image plane IMA. The miniaturization of the lens can be ensured by limiting the relation among the total optical length, the optical back focal length and the effective focal length of the lens, and the total optical length TTL of the lens comprising the plate protective glass CG is specifically less than or equal to 22.45 mm.
In the present invention, the sum of the effective focal length F1 of the first lens L1 and the effective focal length F2 of the second lens L2 and the effective focal length F of the prime lens satisfy the relation: -20.03 ≦ (F1+ F2)/F ≦ -13.42. The thickness d1 of the first lens L1 satisfies the relation: d1 is more than or equal to 0.78 and less than or equal to 1.28. By setting the above parameters of the first lens L1 and the second lens L2, the incident light of the lens can be converged, a large field angle can be achieved, and the optical path of the lens optical system can be controlled.
In the present invention, the effective focal length F2 of the second lens L2 and the effective focal length F3 of the third lens L3 satisfy the relationship: F3/F2 of-1.72 is not less than-1.31. The effective focal length F3 of the third lens L3 and the effective focal length F of the fixed-focus lens satisfy the relation: 15.92 is less than or equal to F3/F is less than or equal to 24.08. By setting the above parameters of the second lens L2 and the third lens L3, the aberration generated by the light passing through the stop can be reduced.
In the present invention, the prime lens includes at least one low dispersion glass lens, and the abbe number of the fourth lens L4 is greater than 90. The effective focal length F4 of the fourth lens L4 and the effective focal length F of the fixed-focus lens satisfy the relation: F4/F is more than or equal to 2.05 and less than or equal to 2.10. The chromatic aberration can be corrected, the small purple edge is realized, the performance of the infrared band of the lens is further improved, and the infrared band of the lens is imaged clearly.
In the present invention, the sum of the effective focal length F5 of the fifth lens L5 and the effective focal length F6 of the sixth lens L6 and the effective focal length F of the prime lens satisfy the relation: -0.70 ≦ (F5+ F6)/F ≦ -0.67. The parameters of the fifth lens L5 and the sixth lens L6 are set and limited, so that the high temperature and the low temperature can be balanced, the optical imaging performance of the lens can be improved, and the lens is suitable for high-temperature and low-temperature environmental conditions.
The following three embodiments are specifically described with reference to the drawings and tables. In the following embodiments, the present invention designates the stop STO as one surface and the image surface IMA as one surface.
The parameters of each example specifically corresponding to the above relationship are shown in table 1 below:
TABLE 1
In various embodiments of the present invention, the plastic aspheric lens of the fixed-focus lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position of the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12、A14、A16The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example 1
Referring to fig. 1, in the present embodiment, the parameters of the fixed-focus lens are as follows:
FNO: 1.62; total lens length: 22.18 mm; focal length: 3.79 mm.
Relevant parameters of each lens of the prime lens of the present embodiment include a surface type, a curvature radius R value, a thickness, a refractive index of a material, and an abbe number, and S1 to S16 represent each surface of each lens, the stop STO, and the plate protective glass CG in the prime lens, as shown in table 2 below.
| Number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Aspherical surface | 100.78 | 1.12 | 1.54 | 55.71 |
| S2 | Aspherical surface | 3.22 | 2.28 | ||
| S3 | Aspherical surface | -4.46 | 1.79 | 1.54 | 55.71 |
| S4 | Aspherical surface | -6.09 | 0.20 | ||
| S5(STO) | Spherical surface | Infinity | 0.27 | ||
| S6 | Aspherical surface | 6.78 | 2.19 | 1.64 | 23.53 |
| S7 | Aspherical surface | 6.74 | 0.55 | ||
| S8 | Spherical surface | 8.53 | 3.99 | 1.46 | 90.19 |
| S9 | Spherical surface | -5.39 | 0.10 | ||
| S10 | Aspherical surface | 6.81 | 2.85 | 1.54 | 55.71 |
| S11 | Aspherical surface | -3.95 | 0.20 | ||
| S12 | Aspherical surface | -2.34 | 0.94 | 1.64 | 23.53 |
| S13 | Aspherical surface | -5.14 | 4.7 | ||
| S14 | Spherical surface | Infinity | 0.70 | 1.52 | 64.21 |
| S15 | Spherical surface | Infinity | 0.30 | ||
| S16(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 2
The aspheric coefficients of the aspheric lenses of the prime lens of this embodiment include the conic constant K value and the fourth-order aspheric coefficient a of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12Fourteen-order aspheric surface coefficient A14And a sixteen-order aspheric coefficient A16As shown in table 3 below.
TABLE 3
By combining the related design parameters and specific data in the tables 1 to 3 in the figure 1, the prime lens is miniaturized, has low cost, high pixel, FNO (FNO) less than or equal to 1.64, has high resolution of 600 ten thousand pixels, has an infrared band monitoring function, does not generate virtual focus within the temperature range of-40 ℃ to 80 ℃, forms clear images and adapts to high and low temperature environment conditions. In the aspect of infrared performance, the infrared band performance of the lens is good, and the lens can be used for day and night. In addition, the glass is moulded the lens of different materials and is used mixedly, effectively reduce cost, miniaturization when realizing high resolving power. The total optical length TTL of the lens is less than or equal to 22.45mm (with plate protection glass CG), and the small volume is further ensured.
Example 2
Referring to fig. 2, in the present embodiment, the parameters of the fixed-focus lens are as follows:
FNO: 1.62; total lens length: 22.45 mm; focal length: 3.83 mm.
Relevant parameters of each lens of the prime lens of the present embodiment include a surface type, a curvature radius R value, a thickness, a refractive index of a material, and an abbe number, and S1 to S16 represent each surface of each lens, the stop STO, and the plate protective glass CG in the prime lens, as shown in table 4 below.
TABLE 4
The aspheric coefficients of the aspheric lenses of the prime lens of this embodiment include the conic constant K value and the fourth-order aspheric coefficient a of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12And fourteen order aspheric coefficients A14And a sixteen-order aspheric coefficient A16As shown in table 5 below.
| Number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 0 | -5.84E-04 | 2.02E-05 | 0 | 0 | 0 | 0 | 0 |
| S2 | -0.52 | 1.00E-03 | 1.88E-04 | -6.80E-05 | 1.41E-05 | 1.92E-07 | -2.99E-07 | 2.43E-08 |
| S3 | 0.32 | 3.80E-03 | 1.31E-04 | -7.04E-07 | -6.18E-06 | 6.40E-07 | -8.48E-09 | -3.21E-10 |
| S4 | -3.77 | 8.59E-04 | 4.01E-04 | -6.96E-05 | 2.39E-06 | 2.06E-07 | 6.65E-09 | -2.57E-09 |
| S6 | 4.04 | -1.24E-03 | 2.37E-04 | -7.19E-05 | 1.89E-06 | 6.83E-07 | -7.40E-08 | -1.51E-09 |
| S7 | 1.14 | -4.72E-04 | 3.26E-04 | -1.15E-05 | -2.07E-06 | -1.96E-07 | 2.26E-07 | -2.43E-08 |
| S10 | 1.96 | -1.45E-03 | -1.29E-05 | -2.29E-05 | 2.89E-06 | -6.30E-08 | -1.72E-08 | 9.45E-10 |
| S11 | -1.10 | 4.27E-03 | -2.52E-04 | -1.98E-05 | 2.79E-06 | -1.05E-08 | -8.06E-09 | 3.40E-10 |
| S12 | -3.06 | 6.12E-03 | -6.40E-04 | 3.07E-05 | -1.35E-06 | -6.81E-08 | 3.02E-08 | -1.49E-09 |
| S13 | -12.14 | 7.37E-03 | -3.98E-04 | -1.21E-06 | 1.93E-06 | -2.15E-07 | 1.85E-08 | -6.54E-10 |
TABLE 5
By combining the related design parameters and specific data in the tables 1, 4 to 5 in the figure 2, the prime lens is miniaturized, has low cost, high pixel, FNO (FNO) less than or equal to 1.64, has high resolution of 600 ten thousand pixels, has an infrared band monitoring function, is free of virtual focus within the temperature range of-40 ℃ to 80 ℃, is clear in imaging, and adapts to high and low temperature environment conditions. In the aspect of infrared performance, the infrared band performance of the lens is good, and the lens can be used for day and night. In addition, the glass is moulded the lens of different materials and is used mixedly, effectively reduce cost, miniaturization when realizing high resolving power. The total optical length TTL of the lens is less than or equal to 22.45mm (with plate protection glass CG), and the small volume is further ensured.
Example 3
Referring to fig. 3, in the present embodiment, the parameters of the fixed-focus lens are as follows:
FNO: 1.61; total lens length: 22.24 mm; focal length: 3.80 mm.
Relevant parameters of each lens of the prime lens of the present embodiment include a surface type, a curvature radius R value, a thickness, a refractive index of a material, and an abbe number, and S1 to S16 represent each surface of each lens, the stop STO, and the plate protective glass CG in the prime lens, as shown in table 6 below.
| Number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Aspherical surface | 128.70 | 1.28 | 1.54 | 55.71 |
| S2 | Aspherical surface | 3.20 | 2.28 | ||
| S3 | Aspherical surface | -4.51 | 1.81 | 1.54 | 55.71 |
| S4 | Aspherical surface | -5.85 | 0.20 | ||
| S5(STO) | Spherical surface | Infinity | 0.27 | ||
| S6 | Aspherical surface | 6.79 | 2.17 | 1.64 | 23.53 |
| S7 | Aspherical surface | 6.72 | 0.55 | ||
| S8 | Spherical surface | 8.56 | 4.01 | 1.46 | 90.19 |
| S9 | Spherical surface | -5.40 | 0.05 | ||
| S10 | Aspherical surface | 6.82 | 2.80 | 1.54 | 55.71 |
| S11 | Aspherical surface | -3.96 | 0.20 | ||
| S12 | Aspherical surface | -2.34 | 0.95 | 1.64 | 23.53 |
| S13 | Aspherical surface | -5.17 | 4.67 | ||
| S14 | Spherical surface | Infinity | 0.70 | 1.52 | 64.21 |
| S15 | Spherical surface | Infinity | 0.30 | ||
| S16(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 6
The aspheric coefficients of the aspheric lenses of the prime lens of this embodiment include the conic constant K value and the fourth-order aspheric coefficient a of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12Fourteen-order aspheric surface coefficient A14And a sixteen-order aspheric coefficient A16Table 7 below shows.
| Number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 0 | -2.45E-05 | 3.66E-08 | 0 | 0 | 0 | 0 | 0 |
| S2 | -0.36 | 1.31E-03 | 1.08E-04 | 4.03E-05 | -3.52E-07 | 2.46E-07 | -1.21E-07 | 2.15E-08 |
| S3 | 0.32 | 3.81E-03 | 1.43E-04 | 3.36E-05 | -9.12E-06 | 6.02E-08 | 1.60E-07 | -1.27E-08 |
| S4 | -3.70 | 7.92E-04 | 3.84E-04 | -7.23E-05 | 2.58E-06 | 2.40E-07 | 3.50E-09 | -4.11E-09 |
| S6 | 4.08 | -1.20E-03 | 2.45E-04 | -7.12E-05 | 1.95E-06 | 6.80E-07 | -7.47E-08 | -1.57E-09 |
| S7 | 1.10 | -4.95E-04 | 3.23E-04 | -1.12E-05 | -1.90E-06 | -1.62E-07 | 2.29E-07 | -2.52E-08 |
| S10 | 1.96 | -1.45E-03 | -1.28E-05 | -2.34E-05 | 2.83E-06 | -7.56E-08 | -1.82E-08 | 9.73E-10 |
| S11 | -1.10 | 4.26E-03 | -2.57E-04 | -2.20E-05 | 2.68E-06 | -1.27E-09 | -6.04E-09 | 1.58E-10 |
| S12 | -3.05 | 6.11E-03 | -6.45E-04 | 2.99E-05 | -1.29E-06 | -6.56E-08 | 3.13E-08 | -1.49E-09 |
| S13 | -12.39 | 7.45E-03 | -3.76E-04 | -3.00E-07 | 1.66E-06 | -2.10E-07 | 1.89E-08 | -6.44E-10 |
TABLE 7
Wherein the third lens L3 has positive optical power. By combining the related design parameters and specific data in the tables 1, 6 to 7 in the diagram of fig. 3, the prime lens is miniaturized, has low cost, high pixel, FNO less than or equal to 1.64, has high resolution of 600 ten thousand pixels, has an infrared band monitoring function, is free of virtual focus within a temperature range of-40 ℃ to 80 ℃, is clear in imaging, and is suitable for high and low temperature environmental conditions. In the aspect of infrared performance, the infrared band performance of the lens is good, and the lens can be used for day and night. In addition, the glass is moulded the lens of different materials and is used mixedly, effectively reduce cost, miniaturization when realizing high resolving power. The total optical length TTL of the lens is less than or equal to 22.45mm (with plate protection glass CG), and the small volume is further ensured.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. 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 (12)
1. A prime lens, comprising: the optical lens is characterized in that a first lens (L1) with negative focal power, a second lens (L2) with negative focal power, a diaphragm (STO), a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with positive focal power, a sixth lens (L6) with negative focal power and a flat protective glass (CG) are sequentially arranged along the direction from the object side to the image side along the optical axis, and the optical back focal length BFL of the fixed-focus lens and the effective focal length F of the fixed-focus lens satisfy the following relational expression: BFL/F is more than or equal to 1.49 and less than or equal to 1.51.
2. The prime lens according to claim 1, wherein in a direction from an object side to an image side along an optical axis,
the first lens (L1) and the third lens (L3) are both convex-concave lenses;
the second lens (L2) is a concave-convex lens;
the fourth lens (L4) and the fifth lens (L5) are both convex lenses;
the sixth lens (L6) has a concave-convex shape in the paraxial region.
3. The prime lens according to claim 1, wherein the first lens (L1), the second lens (L2), the third lens (L3), the fifth lens (L5), and the sixth lens (L6) are each aspheric lenses;
the fourth lens (L4) is a spherical lens.
4. The prime lens according to claim 1, wherein the first lens (L1), the second lens (L2), the third lens (L3), the fifth lens (L5), and the sixth lens (L6) are all plastic lenses;
the fourth lens (L4) is a glass lens.
5. The prime lens according to claim 1, wherein the prime lens comprises at least one low dispersion glass lens, and the abbe number of the fourth lens (L4) is greater than 90.
6. The fixed focus lens as claimed in any one of claims 1 to 5, wherein the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the following relation: TTL/F is more than or equal to 5.85 and less than or equal to 5.92.
7. The prime lens according to any one of claims 1 to 5, wherein the sum of the effective focal length F1 of the first lens (L1) and the effective focal length F2 of the second lens (L2) and the effective focal length F of the prime lens satisfy the relation: -20.03 ≦ (F1+ F2)/F ≦ -13.42.
8. The prime lens according to any one of claims 1 to 5, wherein the thickness d1 of the first lens (L1) satisfies the relation: d1 is more than or equal to 0.78 and less than or equal to 1.28.
9. The prime lens according to any one of claims 1 to 5, wherein the effective focal length F2 of the second lens (L2) and the effective focal length F3 of the third lens (L3) satisfy the relation: F3/F2 of-1.72 is not less than-1.31.
10. The prime lens according to any one of claims 1 to 5, wherein the effective focal length F3 of the third lens (L3) and the effective focal length F of the prime lens satisfy the relation: 15.92 is less than or equal to F3/F is less than or equal to 24.08.
11. The prime lens according to any one of claims 1 to 5, wherein the effective focal length F4 of the fourth lens (L4) and the effective focal length F of the prime lens satisfy the relation: F4/F is more than or equal to 2.05 and less than or equal to 2.10.
12. The prime lens according to any one of claims 1 to 5, wherein the sum of the effective focal length F5 of the fifth lens (L5) and the effective focal length F6 of the sixth lens (L6) and the effective focal length F of the prime lens satisfy the relation: -0.70 ≦ (F5+ F6)/F ≦ -0.67.
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| CN202210147151.4A CN114355578B (en) | 2022-02-17 | 2022-02-17 | Fixed focus lens |
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| CN202210147151.4A CN114355578B (en) | 2022-02-17 | 2022-02-17 | Fixed focus lens |
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Citations (6)
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| JP2017173347A (en) * | 2016-03-18 | 2017-09-28 | 富士フイルム株式会社 | Image capturing lens and image capturing device |
| CN109324384A (en) * | 2017-07-31 | 2019-02-12 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109445078A (en) * | 2018-11-05 | 2019-03-08 | 舜宇光学(中山)有限公司 | Bugeye lens |
| CN111258031A (en) * | 2020-03-17 | 2020-06-09 | 天津欧菲光电有限公司 | Optical lens, imaging module, electronic device and driving device |
| CN112444938A (en) * | 2019-08-28 | 2021-03-05 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN113885181A (en) * | 2021-11-05 | 2022-01-04 | 舜宇光学(中山)有限公司 | Fixed focus lens |
-
2022
- 2022-02-17 CN CN202210147151.4A patent/CN114355578B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017173347A (en) * | 2016-03-18 | 2017-09-28 | 富士フイルム株式会社 | Image capturing lens and image capturing device |
| CN109324384A (en) * | 2017-07-31 | 2019-02-12 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109445078A (en) * | 2018-11-05 | 2019-03-08 | 舜宇光学(中山)有限公司 | Bugeye lens |
| CN112444938A (en) * | 2019-08-28 | 2021-03-05 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN111258031A (en) * | 2020-03-17 | 2020-06-09 | 天津欧菲光电有限公司 | Optical lens, imaging module, electronic device and driving device |
| CN113885181A (en) * | 2021-11-05 | 2022-01-04 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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