CN114355578B - Fixed focus lens - Google Patents
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- CN114355578B CN114355578B CN202210147151.4A CN202210147151A CN114355578B CN 114355578 B CN114355578 B CN 114355578B CN 202210147151 A CN202210147151 A CN 202210147151A CN 114355578 B CN114355578 B CN 114355578B
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- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 239000011521 glass Substances 0.000 claims abstract description 21
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 13
- 238000003384 imaging method Methods 0.000 abstract description 11
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 239000006059 cover glass Substances 0.000 description 4
- 238000003331 infrared imaging Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 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
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method 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: 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 panel protection glass (CG) are sequentially arranged along the direction from the object side to the image side, wherein the relation between the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens is as follows: BFL/F is less than or equal to 1.49 and less than or equal to 1.51. The fixed focus lens provided by the invention has the advantages of miniaturization, low cost, high pixel, FNO less than or equal to 1.64, high resolution of 600 ten thousand pixels, infrared band monitoring function, day and night dual-purpose performance, and clear imaging, and is safe and protective, and does not have virtual focus in the temperature range of-40 ℃ to 80 ℃.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a fixed-focus lens.
Background
With the improvement of the work importance of people in the public safety field, the requirements and the imaging quality of security and protection fixed-focus lenses such as monitoring facilities 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 condition and the like.
The existing security lens can adopt a dual-band confocal technology to realize the monitoring at daytime and night, and in order to realize the purpose, the offset of the infrared focus of the lens is required to be in the range of the focus depth of infrared light. But infrared imaging cannot guarantee real color information, so that the guarantee of clear infrared imaging is an urgent problem to be solved in the security monitoring field.
Chinese patent CN108333712B discloses an optical image system set, an image capturing device and an electronic device. The optical image system comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a filter element and plate glass in sequence from an object side to an image side, wherein the second lens has negative refractive power, the object side surface of the second lens is concave at a paraxial region thereof, and the image side surface of the second lens is convex at a paraxial region thereof. 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 specific conditions are satisfied, the characteristics of sufficient viewing angle, miniaturization, environmental change resistance and high imaging quality can be achieved. However, the above-mentioned technique does not solve the problem that the real color information cannot be ensured by infrared imaging of the lens.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the security monitoring fixed focus lens which is miniaturized, low in cost, high in pixel, high in resolution of 600 ten thousand pixels, and meanwhile has an infrared band monitoring function and does not have virtual focus in the temperature range of-40-80 ℃.
In order to achieve the above object, the present invention provides a fixed focus lens comprising: the optical lens 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 flat protection glass, which are sequentially arranged along the direction from an object side to an image side of an optical axis.
According to one aspect of the invention, the optical axis is oriented in a direction from the object side to the image side,
the first lens and the third lens are convex-concave lenses;
the second lens is a concave-convex lens;
the fourth lens and the fifth lens are convex lenses;
the sixth lens has a concave-convex shape at the paraxial region.
According to one aspect of the present invention, the first lens, the second lens, the third lens, the fifth lens, and the sixth lens are all aspherical lenses;
the fourth lens is a spherical lens.
According to one 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 comprises at least one glass lens with low dispersion, 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 relationship: TTL/F is less than or equal to 5.85 and less than or equal to 5.92.
According to one aspect of the invention, the relation between the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens is satisfied: BFL/F is less than or equal to 1.49 and less than or equal to 1.51.
According to one aspect of the present invention, the sum of the effective focal length F1 of the first lens and the effective focal length F2 of the second lens and the effective focal length F of the fixed focus lens satisfy the relation: -20.03 < (F1+F2)/F < 13.42.
According to one aspect of the present 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 present invention, the effective focal length F2 of the second lens and the effective focal length F3 of the third lens satisfy the relationship: F3/F2 is less than or equal to-1.72 and less than or equal to-1.31.
According to one aspect of the present invention, the effective focal length F3 of the third lens and the effective focal length F of the fixed focus lens satisfy the relationship: F3/F is less than or equal to 15.92 and less than or equal to 24.08.
According to one aspect of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the fixed focus lens satisfy the relationship: F4/F is less than or equal to 2.05 and less than or equal to 2.10.
According to one aspect of the present invention, the sum of the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens and the effective focal length F of the fixed focus lens satisfy the relationship: -0.70 < (F5+F6)/F < 0.67.
According to the scheme of the invention, the security monitoring fixed focus lens which is miniaturized, low in cost, high in pixel, and less than or equal to 1.64 in FNO, has high resolution of 600 ten thousand pixels, has an infrared band monitoring function, does not have virtual focus in a temperature range of-40-80 ℃, is clear in imaging and is suitable for high and low temperature environment conditions is provided. The infrared band performance of the lens is good in infrared performance, and day and night dual-purpose can be achieved. In addition, the glass plastic lenses made of different materials are mixed for use, so that high resolution is realized, and meanwhile, the cost is effectively reduced and the size is reduced. The total optical length TTL of the lens is less than or equal to 22.45mm (with plate protecting glass), and the small volume is further ensured.
Drawings
Fig. 1 schematically shows a schematic structure of a fixed focus lens of embodiment 1 of the present invention;
fig. 2 schematically shows a structure of a fixed focus lens according to embodiment 2 of the present invention;
fig. 3 schematically shows a structure of a fixed focus lens of 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 that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail 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 optical power, a second lens L2 having negative optical power, a stop STO, a third lens L3 having positive optical power, a fourth lens L4 having positive optical power, a fifth lens L5 having positive optical power, a sixth lens L6 having negative optical power, and a plate cover glass CG, which are arranged in this order along the optical axis from the object side to the image side.
Along the direction from the object side to the image side of the optical axis, the first lens L1 and the third lens L3 are both convex-concave shaped lenses, the second lens L2 is a concave-convex shaped lens, the fourth lens L4 and the fifth lens L5 are both convex-convex shaped lenses, and the sixth lens L6 is a concave-convex shaped lens at the paraxial region.
The optical structure of the fixed focus lens combines and matches the positive and negative focal power lenses and lenses with different shapes in the mode, so that aberration of the lens is well corrected, 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 protection glass CG is arranged between the image side surface of the sixth lens L6 and the image plane IMA, so that the astigmatism of the lens optical system can be controlled, further, the miniaturization, high resolution performance of 600 ten thousand pixels and day and night performance compatibility are achieved, meanwhile, the lens has an infrared band monitoring function, and clear imaging is achieved in a 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 the 6 lenses of the fixed focus lens, 5 lenses are all plastic aspheric lenses, 1 lens is a glass spherical lens, and by reasonably arranging the lenses made of plastic materials and glass materials, the defects that the expansion coefficient of the plastic material aspheric lenses is large and focus drift is easily caused under the high-low temperature change environment are overcome by complementation of the lenses made of different materials, so that the high-image quality imaging of the lens can be ensured and the low cost is realized.
In the invention, the optical total length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the relation: TTL/F is less than or equal to 5.85 and less than or equal to 5.92. The optical total length TTL refers to the optical total length of the lens including the plate protection glass CG. The relation between the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens is as follows: BFL/F is less than or equal to 1.49 and less than or equal to 1.51. The optical back Jiao Changdu BFL refers to the distance between the image side surface of the last lens element of the fixed focus lens assembly, i.e., the sixth lens element L6 and the image plane IMA. By limiting the relation among the optical total length, the optical back focal length and the effective focal length of the lens, the miniaturization of the lens can be ensured, and the optical total length TTL of the lens containing the plate protecting glass CG is smaller than or equal to 22.45mm.
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 fixed focus lens satisfy the relationship: -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 parameters of the first lens L1 and the second lens L2, the incident light rays of the lens can be converged, a large field angle is realized, and the light path of the lens optical system is 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 is less than or equal to-1.72 and less than or equal to-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: F3/F is less than or equal to 15.92 and less than or equal to 24.08. By setting the above parameters of the second lens L2 and the third lens L3, aberration generated by light passing through the aperture can be reduced.
In the present invention, the fixed focus lens comprises at least one glass lens with low dispersion, 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 less 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 infrared band performance of the lens is further improved, and the infrared band of the lens is clearly imaged.
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 fixed focus lens satisfy the relationship: -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 is improved, and the lens is suitable for high-low temperature environment conditions.
The following describes the fixed focus lens of the present invention in detail with reference to the drawings and tables. In the following embodiments, the present invention refers to the stop STO as one side and the image plane IMA as one side.
The parameters of the various embodiments specifically conforming to the above relationship are shown in table 1 below:
TABLE 1
In various embodiments of the present invention, the plastic aspherical 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 with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
Referring to fig. 1, in the present embodiment, the parameters of the fixed focus lens are as follows:
and F, NO:1.62; total length of lens: 22.18mm; focal length: 3.79mm.
The relevant parameters of each lens of the fixed focus lens of the present embodiment, including the surface type, the radius of curvature R value, the thickness, the refractive index of the material, and the abbe number, S1 to S16 represent each surface of each lens, the stop STO, and the platen cover glass CG in the fixed focus lens, as shown in table 2 below.
| Face number | Surface type | R value | Thickness of (L) | 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 aspherical coefficients of each aspherical lens of the fixed focus lens of the embodiment comprise the quadric constant K value and the fourth order aspherical coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 As shown in table 3 below.
TABLE 3 Table 3
By combining the relevant design parameters and specific data in the tables 1 to 3 in FIG. 1, the fixed focus lens realizes miniaturization, low cost, high pixel and FNO less than or equal to 1.64, has high resolution of 600 ten thousand pixels, simultaneously has an infrared band monitoring function, does not have virtual focus in the temperature range of-40 to 80 ℃, has clear imaging and is suitable for high and low temperature environment conditions. The infrared band performance of the lens is good in infrared performance, and day and night dual-purpose can be achieved. In addition, the glass plastic lenses made of different materials are mixed for use, so that high resolution is realized, and meanwhile, the cost is effectively reduced and the size is reduced. The total optical length TTL of the lens is less than or equal to 22.45mm (with the plate protecting 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:
and F, NO:1.62; total length of lens: 22.45mm; focal length: 3.83mm.
The relevant parameters of each lens of the fixed focus lens of the present embodiment, including the surface type, the radius of curvature R value, the thickness, the refractive index of the material, and the abbe number, S1 to S16 represent each surface of each lens, the stop STO, and the platen cover glass CG in the fixed focus lens, as shown in table 4 below.
TABLE 4 Table 4
The aspherical coefficients of each aspherical lens of the fixed focus lens of the embodiment comprise the quadric constant K value and the fourth order aspherical coefficient A of the surface 4 Six kinds ofOrder aspheric coefficient A 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 And sixteen order aspheric coefficient A 16 As shown in table 5 below.
| Face number | K value | 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 relevant design parameters and specific data in the tables 1, 4 to 5 in FIG. 2, the fixed focus lens realizes miniaturization, low cost, high pixel and FNO less than or equal to 1.64, has high resolution of 600 ten thousand pixels, simultaneously has an infrared band monitoring function, does not have virtual focus in the temperature range of-40 to 80 ℃, has clear imaging and is suitable for high and low temperature environment conditions. The infrared band performance of the lens is good in infrared performance, and day and night dual-purpose can be achieved. In addition, the glass plastic lenses made of different materials are mixed for use, so that high resolution is realized, and meanwhile, the cost is effectively reduced and the size is reduced. The total optical length TTL of the lens is less than or equal to 22.45mm (with the plate protecting 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:
and F, NO:1.61; total length of lens: 22.24mm; focal length: 3.80mm.
The relevant parameters of each lens of the fixed focus lens of the present embodiment, including the surface type, the radius of curvature R value, the thickness, the refractive index of the material, and the abbe number, S1 to S16 represent each surface of each lens, the stop STO, and the platen cover glass CG in the fixed focus lens, as shown in table 6 below.
| Face number | Surface type | R value | Thickness of (L) | 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 aspherical coefficients of each aspherical lens of the fixed focus lens of the embodiment comprise the quadric constant K value and the fourth order aspherical coefficient of the surfaceFace factor A 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 Shown in table 7 below.
| Face number | K value | 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 relevant design parameters and specific data in the table 1, the table 6 to the table 7 in fig. 3, the fixed focus lens realizes miniaturization, low cost, high pixel and FNO less than or equal to 1.64, has high resolution of 600 ten thousand pixels, simultaneously has an infrared band monitoring function, does not have virtual focus in a temperature range of-40 ℃ to 80 ℃, has clear imaging and is suitable for high and low temperature environment conditions. The infrared band performance of the lens is good in infrared performance, and day and night dual-purpose can be achieved. In addition, the glass plastic lenses made of different materials are mixed for use, so that high resolution is realized, and meanwhile, the cost is effectively reduced and the size is reduced. The total optical length TTL of the lens is less than or equal to 22.45mm (with the plate protecting 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 various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fixed focus lens comprising: the optical lens is characterized in that a relation between an optical back Jiao Changdu BFL of the fixed focus lens and an effective focal length F of the fixed focus lens is as follows: BFL/F is less than or equal to 1.49 and less than or equal to 1.51;
the fixed focus lens at least comprises a low-dispersion glass lens, and the Abbe number of the fourth lens (L4) is more 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 less than or equal to 2.05 and less than or equal to 2.10.
2. The fixed focus lens of 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 convex-concave lenses;
the second lens (L2) is a concave-convex lens;
the fourth lens (L4) and the fifth lens (L5) are both convex-convex lenses;
the sixth lens (L6) has a concave-convex shape at the paraxial region.
3. The fixed focus 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 aspherical lenses;
the fourth lens (L4) is a spherical lens.
4. The fixed focus lens of 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 fixed focus lens of any one of claims 1 to 4, wherein a total optical length TTL of the fixed focus lens and an effective focal length F of the fixed focus lens satisfy the relation: TTL/F is less than or equal to 5.85 and less than or equal to 5.92.
6. The fixed focus lens according to any one of claims 1 to 4, wherein the sum of the effective focal length F1 of the first lens (L1), the effective focal length F2 of the second lens (L2) and the effective focal length F of the fixed focus lens satisfy the relation: -20.03 < (F1+F2)/F < 13.42.
7. The fixed focus lens according to any one of claims 1 to 4, wherein a 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.
8. The fixed focus lens according to any one of claims 1 to 4, 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 is less than or equal to-1.72 and less than or equal to-1.31.
9. The fixed focus lens according to any one of claims 1 to 4, characterized in that the effective focal length F3 of the third lens (L3) and the effective focal length F of the fixed focus lens satisfy the relation: F3/F is less than or equal to 15.92 and less than or equal to 24.08.
10. The fixed focus lens according to any one of claims 1 to 4, wherein the sum of the effective focal length F5 of the fifth lens (L5), the effective focal length F6 of the sixth lens (L6), and the effective focal length F of the fixed focus 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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| CN114355578B true CN114355578B (en) | 2024-03-19 |
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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 |
| 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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