CN114755808B - Fixed focus lens - Google Patents
Fixed focus lens Download PDFInfo
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- CN114755808B CN114755808B CN202210451758.1A CN202210451758A CN114755808B CN 114755808 B CN114755808 B CN 114755808B CN 202210451758 A CN202210451758 A CN 202210451758A CN 114755808 B CN114755808 B CN 114755808B
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- 230000003287 optical effect Effects 0.000 claims description 29
- 239000011521 glass Substances 0.000 claims description 9
- 230000005499 meniscus Effects 0.000 claims 1
- 238000003384 imaging method Methods 0.000 abstract description 12
- 230000004075 alteration Effects 0.000 description 18
- 238000003331 infrared imaging Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 238000010226 confocal imaging Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to a fixed focus lens, comprising: the lens comprises a first lens (L1) with negative focal power, a second lens (L2) with negative focal power, a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with positive focal power and a sixth lens (L6) with negative focal power, 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 fourth lens (L4) with negative focal power, the first lens (L1) with non-spherical lens, the fourth lens (L4) with spherical lens, and the second lens (L2) with concave lens with concave paraxial region. The fixed focus lens has the characteristics of 158-degree ultra-wide angle imaging, 8M resolution, miniaturization, low cost, good infrared performance, high and low temperature performance and day and night confocal performance.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a fixed-focus lens.
Background
Under the push of the digital information age, the demand of fixed focus lenses in the fields of security, public safety and monitoring facilities is increasing day by day. The fixed focus lens with the advantages of clear imaging, wide monitoring field range, low required illumination requirement, day and night dual-purpose and the like is widely applied to the fields. The ultra-wide angle fixed focus lens in the market has the problems of large distortion, low resolution, large volume, unstable high-low temperature performance and incapability of being used at night, which is always a concern in security lenses.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a fixed focus lens which has a large field of view, 8M resolution, miniaturization, low cost, good infrared performance and high and low temperature performance and day and night confocal.
In order to achieve the above object, the present invention provides a fixed focus lens comprising: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power, wherein the first lens, the second lens, the third lens, the fourth lens and the second lens are sequentially arranged along the direction from an object side to an image side of an optical axis, the third lens is a paraxial region convex-concave lens, the fourth lens is a convex lens, the first lens is an aspheric lens, the fourth lens is a spherical lens, and the second lens is a paraxial region concave-concave lens.
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 is a paraxial region convex-concave lens or a paraxial region concave-concave lens;
the fifth lens is a paraxial region convex lens;
the sixth lens is a paraxial region concave-convex lens.
According to one aspect of the present invention, the second lens, the third lens, the fifth lens, and the sixth lens are all aspherical lenses.
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 invention, a stop is further included on the image side of the third lens, between the third lens and the fourth lens, on the image side of the fourth lens, or between the fourth lens and the fifth lens.
According to one aspect of the present invention, the optical total length TTL of the fixed focus lens and the focal length F of the fixed focus lens satisfy the relation: TTL/F is less than 5.9 and less than 8.9.
According to one aspect of the invention, the relation between the optical back focus BFL of the fixed focus lens and the focal length F of the fixed focus lens is satisfied: BFL/F is less than 1.6 and less than 2.4.
According to one aspect of the present invention, the focal length F2 of the second lens and the focal length F1 of the first lens satisfy the relationship: F2/F1 is more than 0.4 and less than 1.2.
According to one aspect of the present invention, a relationship between a focal length F4 of the fourth lens and a focal length F1 of the first lens is satisfied: -1.6 < F4/F1 < -0.6.
According to one aspect of the present invention, a relationship between a focal length F5 of the fifth lens and a focal length F of the fixed focus lens is satisfied: F5/F is less than 1.4 and less than 1.8.
According to one aspect of the present invention, a relationship between a focal length F56 of the fifth lens and the sixth lens and a focal length F of the fixed focus lens is satisfied: F56/F is less than 3.0 and less than 3.5.
According to one aspect of the present invention, a relationship between a center length d12 of an image side surface of the first lens from an object side surface of the second lens and a focal length F of the fixed focus lens is satisfied: d12/F is more than 1.0 and less than 1.6.
According to one aspect of the present invention, a relationship between a center length d12 of the image side surface of the first lens element from the object side surface of the second lens element, a center length d34 of the image side surface of the third lens element from the object side surface of the fourth lens element, and focal lengths F56 of the fifth lens element and the sixth lens element is satisfied: 0.6 < (d12+d34)/F56 < 0.9.
According to the scheme of the invention, through the optical imaging system framework formed by six lenses with focal power of negative-positive-negative combination from the object side to the image side, different concave-convex shapes of the six lenses are combined and matched, a diaphragm and the like, the performances of 158-degree ultra-wide angle design, 8M (800 ten thousand pixels) resolution, miniaturization, low cost, light weight, stable imaging under high and low temperature environments, infrared confocal and infrared imaging without virtual focus can be realized.
According to the scheme of the invention, through the design of the single glass lens, the chromatic aberration of the system can be effectively corrected, the high resolution of 8M pixels of the system can be ensured, and the miniaturization and the light weight of the system can be realized. The glass-plastic mixed optical framework of one glass lens and five plastic lenses can balance the high-low temperature performance and infrared performance of the lens, and meanwhile, the design of low cost and light weight of the lens is realized.
According to one aspect of the present invention, the optical total length TTL of the fixed focus lens and the focal length F of the fixed focus lens satisfy the relation: the TTL/F is more than 5.9 and less than 8.9, and the relation between the optical back focus BFL of the fixed focus lens and the focal length F of the fixed focus lens is satisfied: BFL/F is smaller than 1.6 and smaller than 2.4, and the miniaturized design of the lens can be further realized.
According to an aspect of the invention, a relationship between a center length d12 of the image side surface of the first lens element L1 from the object side surface of the second lens element L2 and a focal length F of the fixed focus lens element is: 1.0 < d12/F < 1.6, the center lengths d12 of the image side surface of the first lens element L1 and the object side surface of the second lens element L2, the center lengths d34 of the image side surface of the third lens element L3 and the object side surface of the fourth lens element L4, and the focal lengths F56 of the fifth lens element L5 and the sixth lens element L6 satisfy the following relationship: 0.6 < (d12+d34)/F56 < 0.9. The lens structure is compact, and the miniaturization design of the lens is facilitated.
According to an aspect of the present invention, the focal length F2 of the second lens L2 and the focal length F1 of the first lens L1 satisfy the relationship: the F2/F1 is more than 0.4 and less than 1.2, the light trend of the optical system of the whole fixed focus lens can be controlled, the ultra-wide angle incidence of light is realized, and the aberration caused by light with a large angle is reduced. The focal length F4 of the fourth lens L4 and the focal length F1 of the first lens L1 satisfy the relationship: by designing the relation between the focal length of the single glass lens and the focal length of the first lens, chromatic aberration and aberration caused by light entering through the diaphragm can be corrected, and high resolution and infrared confocal performance can be ensured. The relation between the focal length F5 of the fifth lens L5 and the focal length F of the fixed focus lens satisfies: F5/F is more than 1.4 and less than 1.8, can balance the high-low temperature performance and system aberration of the lens, and is favorable for realizing high resolution and athermalization design of the lens. The focal lengths F56 of the fifth lens L5 and the sixth lens L6 and the focal length F of the fixed focus lens satisfy the relation: the F56/F is more than 3.0 and less than 3.5, and the combined lens formed by the fifth lens and the sixth lens can realize that the lens is not in virtual focus within the temperature range of minus 40 ℃ to 80 ℃.
Drawings
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.
Fig. 1 schematically illustrates a structure of a fixed focus lens disclosed in embodiment 1 of the present invention;
fig. 2 schematically illustrates a structure of a fixed focus lens disclosed in embodiment 2 of the present invention;
fig. 3 schematically illustrates a structure of a fixed focus lens disclosed in embodiment 3 of the present invention;
fig. 4 schematically shows a structure of a fixed focus lens disclosed in embodiment 4 of the present invention.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
Referring to fig. 1, a fixed focus lens in an embodiment of the present invention includes: the optical lens comprises a first lens L1 with negative focal power, a second lens L2 with negative focal power, 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 parallel plates, which are sequentially arranged along the direction from the object side to the image side of an optical axis. The fixed focus lens further includes a stop STO located on the image side of the third lens L3, between the third lens L3 and the fourth lens L4, on the image side of the fourth lens L4, or between the fourth lens L4 and the fifth lens L5. In the embodiment of the invention, the first lens L1 is a paraxial region convex-concave lens or a paraxial region concave-concave lens, the second lens L2 is a paraxial region concave-concave lens, the third lens L3 is a paraxial region convex-concave lens, the fourth lens L4 is a convex lens, the fifth lens L5 is a paraxial region convex-convex lens, and the sixth lens L6 is a paraxial region concave-convex lens. Through the optical architecture formed by combining and collocating the focal power and the shape of the six lenses, the performances of 158-degree ultra-wide angle design, 8M resolution, miniaturization, stable imaging in high and low temperature environments and no virtual focus in infrared imaging can be realized.
In the embodiment of the invention, 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. Through the design of a single glass lens, the chromatic aberration of the system can be effectively corrected, the high resolution of 8M pixels of the system is ensured, and the system can be miniaturized and light. The glass-plastic mixed optical framework of one glass lens and five plastic lenses can balance the high-low temperature performance and infrared performance of the lens, and meanwhile, the design of low cost and light weight of the lens is realized.
In the embodiment of the invention, the optical total length TTL of the fixed focus lens and the focal length F of the fixed focus lens satisfy the relation: TTL/F is less than 5.9 and less than 8.9. The relation between the optical back focus BFL of the fixed focus lens and the focal length F of the fixed focus lens is as follows: BFL/F is less than 1.6 and less than 2.4. By limiting parameters such as the total optical length, the optical back focal length, the focal length and the like of the lens and the range thereof, the miniaturized design of the lens can be further realized.
In the embodiment of the present invention, the focal length F2 of the second lens L2 and the focal length F1 of the first lens L1 satisfy the following relation: F2/F1 is more than 0.4 and less than 1.2. By the arrangement, the light trend of the optical system of the whole fixed focus lens can be controlled, the light ultra-wide angle incidence is realized, and the aberration caused by large-angle light is reduced.
In the embodiment of the present invention, the focal length F4 of the fourth lens L4 and the focal length F1 of the first lens L1 satisfy the following relation: -1.6 < F4/F1 < -0.6. By designing the relation between the focal length of the single glass lens and the focal length of the first lens L1 in this way, chromatic aberration and aberration caused by light entering through the diaphragm STO can be corrected, which is beneficial to ensuring high resolution and infrared confocal performance.
In the embodiment of the present invention, the focal length F5 of the fifth lens L5 and the focal length F of the fixed focus lens satisfy the following relation: F5/F is less than 1.4 and less than 1.8. The lens can balance high and low temperature performance and system aberration, and is favorable for realizing high resolution and athermalization design of the lens.
In the embodiment of the present invention, the focal lengths F56 of the fifth lens L5 and the sixth lens L6 and the focal length F of the fixed focus lens satisfy the following relation: F56/F is less than 3.0 and less than 3.5. By combining the fifth lens L5 and the sixth lens L6, the design of the combined lens and the limitation of the combined focal length and the lens focal length can realize that the lens is free from virtual focus in the temperature range of-40 ℃ to 80 ℃.
In the embodiment of the invention, the relationship between the center length d12 of the image side surface of the first lens element L1 from the object side surface of the second lens element L2 and the focal length F of the fixed focus lens element is: d12/F is more than 1.0 and less than 1.6. The relationship between the center length d12 of the image side surface of the first lens element L1 from the object side surface of the second lens element L2, the center length d34 of the image side surface of the third lens element L3 from the object side surface of the fourth lens element L4, and the focal lengths F56 of the fifth lens element L5 and the sixth lens element L6 is as follows: 0.6 < (d12+d34)/F56 < 0.9. The arrangement is favorable for reducing the sensitivity of ultra-wide angle incident light rays to the lens, has low assembly tolerance sensitivity, and simultaneously ensures that the lens structure in the lens optical system is compact, thereby being favorable for the miniaturized design of the lens.
The following describes the fixed focus lens of the present invention in detail with reference to the accompanying drawings and tables by using 4 embodiments. In the following embodiments, the present invention refers to the stop STO as one side and the image plane as one side.
The parameters of the respective examples specifically meeting the above conditional expression are shown in the following tables 1 and 2:
| parameters (parameters) | Example 1 | Example 2 | Example 3 | Example 4 |
| TTL | 19.551 | 18.173 | 18.658 | 18.898 |
| BFL | 4.881 | 5.230 | 5.089 | 5.076 |
| F | 2.761 | 2.874 | 2.314 | 2.226 |
| F1 | -7.424 | -5.965 | -4.965 | -4.369 |
| F2 | -4.328 | -4.516 | -4.470 | -4.520 |
| F4 | 5.226 | 5.366 | 5.462 | 5.665 |
| F5 | 4.126 | 4.085 | 3.979 | 3.982 |
| F56 | 8.828 | 9.249 | 7.547 | 7.565 |
| d12 | 3.998 | 2.937 | 2.965 | 2.851 |
| d34 | 2.449 | 3.163 | 3.063 | 3.324 |
TABLE 1
TABLE 2
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, the parameters of the fixed focus lens of the present embodiment are as follows:
total lens length: 19.551mm; angle of view: 158 deg.. The stop STO is located on the image side of the third lens L3.
The relevant parameters of each lens in the fixed focus lens of the embodiment include: the surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number are shown in table 3 below.
TABLE 3 Table 3
The aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment include: the quadric constant K and the fourth-order aspheric 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 4 below.
TABLE 4 Table 4
With reference to fig. 1 and tables 1 to 4, the fixed focus lens of the embodiment can effectively balance high-low temperature performance of the lens, chromatic aberration and aberration of an optical system, realize 158 ° ultra-wide angle design and high quality imaging performance of 8M (800 ten thousand pixels) resolution, has the characteristics of miniaturization, low cost and light weight, and simultaneously has the characteristics of stable imaging in high-low temperature environment, no virtual focus in a temperature range of-40 ℃ to 80 ℃, infrared confocal and infrared imaging performance without virtual focus and low assembly tolerance sensitivity.
Example 2
Referring to fig. 2, the parameters of the fixed focus lens of the present embodiment are as follows:
total lens length: 18.173mm; angle of view: 158 deg.. The stop STO is located between the third lens L3 and the fourth lens L4.
The relevant parameters of each lens in the fixed focus lens of the embodiment include: the surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number are shown in table 5 below.
TABLE 5
The aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment include: the quadric constant K and the fourth-order aspheric 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 6 below.
TABLE 6
With reference to fig. 2 and the above tables 1, 2, 5 and 6, the fixed focus lens of this embodiment can effectively balance the high-low temperature performance of the lens, chromatic aberration and aberration of the optical system, realize 158 ° ultra-wide angle design and high quality imaging performance of 8M (800 ten thousand pixels) resolving power, and has the characteristics of miniaturization, low cost and light weight, meanwhile, the fixed focus lens is stable in imaging in high-low temperature environment, does not have virtual focus in the temperature range of-40 ℃ to 80 ℃, realizes infrared confocal and infrared imaging performance without virtual focus, and has low sensitivity of assembly tolerance.
Example 3
Referring to fig. 3, the parameters of the fixed focus lens of the present embodiment are as follows:
total lens length: 18.658mm; angle of view: 158 deg.. The stop STO is located on the image side of the fourth lens L4.
The relevant parameters of each lens in the fixed focus lens of the embodiment include: the surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number are shown in table 7 below.
| Face number | Surface type | R value | Thickness of (L) | Refractive index Nd | Abbe number Vd |
| 1 | Aspherical surface | -33.449 | 1.273 | 1.54 | 55.7 |
| 2 | Aspherical surface | 2.937 | 2.365 | ||
| 3 | Aspherical surface | -5.008 | 0.600 | 1.54 | 55.7 |
| 4 | Aspherical surface | 4.809 | 0.101 | ||
| 5 | Aspherical surface | 3.590 | 3.000 | 1.64 | 23.5 |
| 6 | Aspherical surface | 8.348 | 0.128 | ||
| 7 | Spherical surface | 6.872 | 2.934 | 1.5 | 81.6 |
| 8(STO) | Spherical surface | -3.869 | 0.282 | ||
| 9 | Aspherical surface | 7.052 | 2.166 | 1.54 | 55.7 |
| 10 | Aspherical surface | -2.739 | 0.103 | ||
| 11 | Aspherical surface | -2.428 | 0.617 | 1.64 | 23.5 |
| 12 | Aspherical surface | -4.961 | 4.089 | ||
| 13 | Spherical surface | Infinity | 0.800 | 1.52 | 64.2 |
| 14 | Spherical surface | Infinity | 0.200 | ||
| Image plane | Spherical surface | Infinity | 0.000 |
TABLE 7
The aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment include: the quadric constant K and the fourth-order aspheric 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 8 below.
TABLE 8
With reference to fig. 3 and the above tables 1, 2, 7 and 8, the fixed focus lens of this embodiment can effectively balance the high-low temperature performance of the lens, chromatic aberration and aberration of the optical system, realize 158 ° ultra-wide angle design and high quality imaging performance of 8M (800 ten thousand pixels) resolution, and has the characteristics of miniaturization, low cost and light weight, meanwhile, the fixed focus lens is stable in imaging in high-low temperature environment, does not have virtual focus in the temperature range of-40 ℃ to 80 ℃, realizes infrared confocal and infrared imaging performance without virtual focus, and has low sensitivity of assembly tolerance.
Example 4
Referring to fig. 4, the parameters of the fixed focus lens of the present embodiment are as follows:
total lens length: 18.898mm; angle of view: 158 deg.. The stop STO is located between the fourth lens L4 and the fifth lens L5.
The relevant parameters of each lens in the fixed focus lens of the embodiment include: the surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number are shown in table 9 below.
| Face number | Surface type | R value | Thickness of (L) | Refractive index Nd | Abbe number Vd |
| 1 | Aspherical surface | -26.041 | 1.228 | 1.54 | 55.7 |
| 2 | Aspherical surface | 2.623 | 2.252 | ||
| 3 | Aspherical surface | -5.012 | 0.600 | 1.54 | 55.7 |
| 4 | Aspherical surface | 4.908 | 0.157 | ||
| 5 | Aspherical surface | 3.377 | 3.075 | 1.64 | 23.5 |
| 6 | Aspherical surface | 8.404 | 0.100 | ||
| 7 | Spherical surface | 6.690 | 3.224 | 1.50 | 81.6 |
| 8 | Spherical surface | -4.102 | 0.125 | ||
| 9(STO) | Spherical surface | Infinity | 0.000 | ||
| 10 | Aspherical surface | 6.788 | 2.145 | 1.54 | 55.7 |
| 11 | Aspherical surface | -2.779 | 0.112 | ||
| 12 | Aspherical surface | -2.401 | 0.804 | 1.64 | 23.5 |
| 13 | Aspherical surface | -4.879 | 4.076 | ||
| 14 | Spherical surface | Infinity | 0.800 | 1.52 | 64.2 |
| 15 | Spherical surface | Infinity | 0.200 | ||
| Image plane | Spherical surface | Infinity | 0.000 |
TABLE 9
The aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment include: the quadric constant K and the fourth-order aspheric 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 10 below.
Table 10
With reference to fig. 4 and the above tables 1, 2, 9 and 10, the fixed focus lens of this embodiment can effectively balance the high-low temperature performance of the lens, chromatic aberration and aberration of the optical system, realize 158 ° ultra-wide angle design and high quality imaging performance of 8M (800 ten thousand pixels) resolution, and has the characteristics of miniaturization, low cost and light weight, meanwhile, the fixed focus lens is stable in imaging in high-low temperature environment, does not have virtual focus in the temperature range of-40 ℃ to 80 ℃, realizes infrared confocal and infrared imaging performance without virtual focus, and has low sensitivity of assembly tolerance.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A fixed focus lens, along the direction from an object side to an image side of an optical axis, comprising a first lens (L1) with negative focal power, a second lens (L2) with negative focal power, a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with positive focal power and a sixth lens (L6) with negative focal power, wherein the third lens (L3) is a paraxial region convex-concave lens, the fourth lens (L4) is a convex lens, the first lens (L1) is an aspheric lens, and the fourth lens (L4) is a spherical lens, characterized in that the second lens (L2) is a paraxial region concave-concave lens;
the optical total length TTL of the fixed focus lens and the focal length F of the fixed focus lens satisfy the relation: TTL/F is less than 8.49 and 5.9;
the optical back focus BFL of the fixed focus lens and the focal length F of the fixed focus lens satisfy the relation: BFL/F is less than 1.6 and less than 2.4;
a focal length F56 of the fifth lens (L5) and the sixth lens (L6) and a focal length F of the fixed focus lens satisfy the relationship: F56/F is more than 3.0 and less than 3.398.
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) is a paraxial region convex-concave lens or a paraxial region concave-concave lens;
the fifth lens (L5) is a paraxial region convex lens;
the sixth lens (L6) is a paraxial region meniscus lens.
3. The fixed focus lens according to claim 1, wherein the second lens (L2), the third lens (L3), the fifth lens (L5) and the sixth lens (L6) are all aspherical lenses.
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 as defined in claim 1, further comprising a Stop (STO) on an image side of the third lens (L3), between the third lens (L3) and the fourth lens (L4), on an image side of the fourth lens (L4), or between the fourth lens (L4) and the fifth lens (L5).
6. The fixed focus lens according to any one of claims 1-5, wherein a relation between a focal length F2 of the second lens (L2) and a focal length F1 of the first lens (L1) is satisfied: F2/F1 is more than 0.4 and less than 1.2.
7. The fixed focus lens according to any one of claims 1-5, wherein a relation between a focal length F4 of the fourth lens (L4) and a focal length F1 of the first lens (L1) is satisfied: -1.6 < F4/F1 < -0.6.
8. The fixed focus lens according to any one of claims 1-5, wherein a relation is satisfied between a focal length F5 of the fifth lens (L5) and a focal length F of the fixed focus lens: F5/F is less than 1.4 and less than 1.8.
9. The fixed focus lens as claimed in any one of claims 1-5, wherein a relationship between a center length d12 of an image side surface of the first lens element (L1) from an object side surface of the second lens element (L2) and a focal length F of the fixed focus lens element is satisfied: d12/F is more than 1.0 and less than 1.6.
10. The fixed focus lens as claimed in any one of claims 1-5, wherein a relationship between a center length d12 of an image side surface of the first lens element (L1) from an object side surface of the second lens element (L2), a center length d34 of an image side surface of the third lens element (L3) from an object side surface of the fourth lens element (L4), and a focal length F56 of the fifth lens element (L5) and the sixth lens element (L6) is satisfied: 0.6 < (d12+d34)/F56 < 0.9.
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| CN202210451758.1A CN114755808B (en) | 2022-04-26 | 2022-04-26 | Fixed focus lens |
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| CN202210451758.1A CN114755808B (en) | 2022-04-26 | 2022-04-26 | Fixed focus lens |
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| CN114755808B true CN114755808B (en) | 2024-03-19 |
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| CN102540411A (en) * | 2010-12-30 | 2012-07-04 | 大立光电股份有限公司 | Optical lens group for imaging |
| CN103576290A (en) * | 2013-10-30 | 2014-02-12 | 宁波舜宇车载光学技术有限公司 | Wide-angle lens |
| CN106814435A (en) * | 2015-11-27 | 2017-06-09 | 大立光电股份有限公司 | Optical imaging lens set, image-taking device and electronic installation |
| JP2019056946A (en) * | 2019-01-21 | 2019-04-11 | カンタツ株式会社 | Imaging 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 |
| CN113885181A (en) * | 2021-11-05 | 2022-01-04 | 舜宇光学(中山)有限公司 | Fixed focus lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4857063B2 (en) * | 2006-09-29 | 2012-01-18 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540411A (en) * | 2010-12-30 | 2012-07-04 | 大立光电股份有限公司 | Optical lens group for imaging |
| CN103576290A (en) * | 2013-10-30 | 2014-02-12 | 宁波舜宇车载光学技术有限公司 | Wide-angle lens |
| CN106814435A (en) * | 2015-11-27 | 2017-06-09 | 大立光电股份有限公司 | Optical imaging lens set, image-taking device and electronic installation |
| JP2019056946A (en) * | 2019-01-21 | 2019-04-11 | カンタツ株式会社 | Imaging 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 |
| 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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| CN114755808A (en) | 2022-07-15 |
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