CN217213312U - Fixed focus lens - Google Patents
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- CN217213312U CN217213312U CN202220991685.0U CN202220991685U CN217213312U CN 217213312 U CN217213312 U CN 217213312U CN 202220991685 U CN202220991685 U CN 202220991685U CN 217213312 U CN217213312 U CN 217213312U
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Abstract
The utility model relates to a tight shot, include: a first lens (L1) having negative power, a second lens (L2) having negative power, a third lens (L3) having positive power, a fourth lens (L4) having positive power, a fifth lens (L5) having positive power, and a sixth lens (L6) having negative power, which are arranged in this order from the object side to the image side along the optical axis, the third lens (L3) being a paraxial region concave-convex lens, the fourth lens (L4) being a convex-convex lens, the first lens (L1) being an aspherical lens, the fourth lens (L4) being a spherical lens, the second lens (L2) being a paraxial region concave-concave lens, a focal length F2 of the second lens (L2) and a focal length F1 of the first lens (L1) being such that: F2/F1 is more than 0.7 and less than 1.5. The fixed-focus lens has 158-degree ultra-wide-angle imaging, 8M resolving power, miniaturization, low cost, good infrared performance and high and low temperature performance, and day and night confocal performance.
Description
Technical Field
The utility model relates to an optical system technical field especially relates to a tight shot.
Background
Driven by the digital information era, the demand for 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 illumination requirement, dual purposes of day and night and the like is widely applied to the fields. The ultra-wide angle prime lens in the market has the problems of large distortion, low resolving power, large volume, unstable high and low temperature performance and incapability of being used at night, and is always a relatively concerned problem in security lenses.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a confocal fixed focus lens of big visual field, 8M resolution, miniaturization, low cost, infrared performance and high and low temperature performance are good and day night confocal.
To achieve the above object, the present invention provides a fixed focus lens, including: the optical lens assembly 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 which are sequentially arranged along the direction from the object side to the image side along an optical axis, wherein the third lens is a paraxial region concave-convex lens, the fourth lens is a convex-convex lens, the first lens is an aspheric lens, the fourth lens is a spherical lens, the second lens is a paraxial region concave-concave lens, and the focal length F2 of the second lens and the focal length F1 of the first lens satisfy the following relation: F2/F1 is more than 0.7 and less than 1.5.
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 is a paraxial region concave-convex 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 an aspect of the present invention, the second lens, the third lens, the fifth lens and the sixth lens are aspheric lenses.
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 an aspect of the present invention, the optical module further includes a stop located between the third lens and the fourth lens, on an object-side surface of the fourth lens, on an image-side surface of the fourth lens, or between the fourth lens and the fifth lens.
According to the utility model discloses an aspect, the optics total length TTL of tight shot with satisfy the relational expression between the focus F of tight shot: TTL/F is more than 5.9 and less than 8.9.
According to the utility model discloses an aspect, burnt BFL behind the optics of tight shot with satisfy the relational expression between the focus F of tight shot: BFL/F is more than 1.8 and less than 2.4.
According to an aspect of the present invention, a relationship is satisfied between the focal length F4 of the fourth lens and the focal length F1 of the first lens: -1.6 < F4/F1 < -0.6.
According to an aspect of the present invention, the focal length F5 of the fifth lens element and the focal length F of the fixed focus lens satisfy the following relation: F5/F is more than 1.4 and less than 1.8.
According to an aspect of the present invention, the fifth lens and the focal length F56 of the sixth lens and the focal length F of the fixed focus lens satisfy the following relation: F56/F is more than 3.0 and less than 3.5.
According to an aspect of the present invention, the distance between the image side surface of the first lens element and the center length d12 of the object side surface of the second lens element and the focal length F of the fixed focus lens satisfy the following relation: d12/F is more than 0.8 and less than 1.6.
According to an aspect of the present invention, the distance between the image-side surface of the first lens and the center length d12 of the object-side surface of the second lens, the distance between the image-side surface of the third lens and the center length d34 of the object-side surface of the fourth lens, and the distance between the fifth lens and the focal length F56 of the sixth lens satisfy the following relation: 0.6 < (d12+ d34)/F56 < 0.9.
According to the utility model discloses a scheme, through by the side of object to the image side direction, six lenses that the focal power is "negative-positive-negative" combination, and the different concave-convex shape of these six lenses is combined collocation and the optics imaging system framework that diaphragm etc. constitutes, can realize 158 super wide angle designs, 8M (800 ten thousand pixels) resolution power, miniaturization, with low costs, light in weight, under the high low temperature environment stable and infrared confocal, infrared imaging does not have virtual burnt performance.
According to the utility model discloses a scheme, through the design of single piece of glass lens, not only can effectively correct the system colour difference, guarantees the high resolving power of system 8M pixel, but also can realize small-size, the lightweight of system. The glass-plastic mixed optical framework of one glass lens and five plastic lenses can balance the high-low temperature performance and the infrared performance of the lens, and meanwhile, the design of low cost and light weight of the lens is realized.
According to the utility model discloses a scheme satisfies the relational expression between the optics total length TTL of tight shot and the focus F of tight shot: TTL/F is more than 5.9 and less than 8.9, and 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 more than 1.8 and less than 2.4, and the miniaturization design of the lens can be further realized.
According to an aspect of the present invention, the relationship between the center length d12 of the image side of the first lens L1 from the object side of the second lens L2 and the focal length F of the fixed focus lens is satisfied: 0.8 < d12/F < 1.6, the length d12 of the image side surface of the first lens L1 from the center of the object side surface of the second lens L2, the length d34 of the image side surface of the third lens L3 from the center of the object side surface of the fourth lens L4, and the focal length F56 of the fifth lens L5 and the sixth lens L6 satisfy the following relations: 0.6 < (d12+ d34)/F56 < 0.9. The method is favorable for reducing the sensitivity of the ultra-wide angle incident light to the lens, has low assembly tolerance sensitivity, and simultaneously makes the lens in the lens optical system compact in structure, thereby being favorable for the miniaturization design of the lens.
According to an aspect of the present invention, the relationship between the focal length F2 of the second lens L2 and the focal length F1 of the first lens L1 is satisfied: F2/F1 is more than 0.7 and less than 1.5, the light trend of the optical system of the whole fixed-focus lens can be controlled, ultra-wide-angle incidence of light is realized, and aberration caused by large-angle light is reduced. The focal length F4 of the fourth lens L4 and the focal length F1 of the first lens L1 satisfy the relationship: F4/F1 < -0.6 is more than 1.6, and the relation between the focal length of the single glass lens and the focal length of the first lens is designed in such a way that chromatic aberration and aberration caused by light rays entering through the diaphragm can be corrected, thereby being beneficial to ensuring high resolution and infrared confocal performance. The focal length F5 of the fifth lens L5 and the focal length F of the fixed-focus lens satisfy the relation: F5/F is more than 1.4 and less than 1.8, so that the high and low temperature performance and system aberration of the lens can be balanced, and the high resolving power and athermal design of the lens can be realized. The focal length F56 of the fifth lens L5 and the sixth lens L6 and the focal length F of the prime lens satisfy the relation: F56/F is more than 3.0 and less than 3.5, and the lens can not be virtual focus in the temperature range of-40-80 ℃ due to the combined lens formed by the fifth lens and the sixth lens.
Drawings
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.
Fig. 1 schematically shows a schematic structural diagram of a fixed focus lens disclosed in embodiment 1 of the present invention;
fig. 2 schematically shows a schematic structural diagram of a fixed focus lens disclosed in embodiment 2 of the present invention;
fig. 3 schematically shows a schematic structural diagram of a fixed focus lens disclosed in embodiment 3 of the present invention;
fig. 4 schematically shows a schematic structural diagram of a fixed focus lens disclosed in embodiment 4 of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the appended drawings are intended to be part of the entire specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.
Referring to fig. 1, the fixed focus lens in the embodiment of the present invention includes: a first lens L1 having negative power, a second lens L2 having negative power, 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 parallel plate, which are arranged in this order from the object side to the image side along the optical axis. The prime lens further includes a stop STO located between the third lens L3 and the fourth lens L4, on the object-side surface of the fourth lens L4, on the image-side surface of the fourth lens L4, or between the fourth lens L4 and the fifth lens L5. The embodiment of the utility model provides an in, first lens L1 is the concave type lens of paraxial region convex concave type lens or paraxial region concave type lens, and second lens L2 is paraxial region concave type lens, and third lens L3 is the concave type lens of paraxial region convex concave type lens, and fourth lens L4 is convex lens, and fifth lens L5 is the convex type lens of paraxial region convex type lens, and sixth lens L6 is the concave type lens of paraxial region convex type. The optical framework formed by combining and matching the focal power and the shape of the six lenses can realize 158-degree ultra-wide-angle design, 8M resolving power, miniaturization, stable imaging in high and low temperature environments and no virtual focus performance of infrared imaging.
In the embodiment of the present invention, the first lens L1, the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are 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 small size and 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 the infrared performance of the lens, and meanwhile, the design of low cost and light weight of the lens is realized.
The embodiment of the utility model provides an in, satisfy the relational expression between the optics total length TTL of tight burnt camera lens and the focus F of tight burnt camera lens: TTL/F is more than 5.9 and less than 8.9. 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 more than 1.8 and less than 2.4. The miniaturization design of the lens can be further realized by limiting parameters such as the total optical length, the optical back focus, the focal length and the like of the lens and the range of the parameters.
In the embodiment of the present invention, the relationship between the focal length F2 of the second lens L2 and the focal length F1 of the first lens L1 is satisfied: F2/F1 is more than 0.7 and less than 1.5. So set up, can control the light trend of the optical system of whole tight shot, realize the super wide angle of light incidence, reduce the aberration that the wide-angle light arouses.
In the embodiment of the present invention, the relationship between the focal length F4 of the fourth lens L4 and the focal length F1 of the first lens L1 is satisfied: -1.6 < F4/F1 < -0.6. By designing the relationship 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 stop STO can be corrected, which is beneficial to ensuring high resolving power and infrared confocal performance.
In the embodiment of the present invention, the relationship is satisfied between the focal length F5 of the fifth lens L5 and the focal length F of the fixed focus lens: F5/F is more than 1.4 and less than 1.8. By the arrangement, the high-low temperature performance and the system aberration of the lens can be balanced, and the high-resolution and athermal design of the lens can be realized.
In the embodiment of the present invention, the relationship between the focal length F56 of the fifth lens L5 and the sixth lens L6 and the focal length F of the fixed focus lens is satisfied: F56/F is more than 3.0 and less than 3.5. Through the combination of 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, the lens can be free of virtual focus within the temperature range of-40 ℃ to 80 ℃.
In the embodiment of the present invention, the central length d12 of the image side of the first lens L1 from the object side of the second lens L2 and the focal length F of the fixed focus lens satisfy the relation: d12/F is more than 0.8 and less than 1.6. The length d12 of the image-side surface of the first lens L1 from the center of the object-side surface of the second lens L2, the length d34 of the image-side surface of the third lens L3 from the center of the object-side surface of the fourth lens L4 and the focal length F56 of the fifth lens L5 and the sixth lens L6 satisfy the following relations: 0.6 < (d12+ d34)/F56 < 0.9. The arrangement is favorable for reducing the sensitivity of the ultra-wide angle incident light to the lens, the assembly tolerance sensitivity is low, and simultaneously, the lens in the lens optical system has a compact structure and is favorable for the miniaturization design of the lens.
The following specifically describes the fixed focus lens of the present invention with 4 embodiments in combination with the accompanying drawings and tables. In each of the following embodiments, the present invention records the stop STO as one surface and records the image surface as one surface.
The parameters of each example specifically satisfying the above conditional expressions are shown in tables 1 and 2 below:
| parameter(s) | Example 1 | Example 2 | Example 3 | Example 4 |
| TTL | 18.173 | 18.658 | 18.898 | 18.521 |
| BFL | 5.230 | 5.089 | 5.076 | 5.041 |
| F | 2.874 | 2.314 | 2.226 | 2.407 |
| F1 | -5.965 | -4.965 | -4.369 | -3.812 |
| F2 | -4.516 | -4.470 | -4.520 | -5.085 |
| F4 | 5.366 | 5.462 | 5.665 | 5.714 |
| F5 | 4.085 | 3.979 | 3.982 | 4.069 |
| F56 | 9.249 | 7.547 | 7.565 | 7.372 |
| d12 | 2.937 | 2.965 | 2.851 | 2.284 |
| d34 | 3.163 | 3.063 | 3.324 | 3.037 |
TABLE 1
TABLE 2
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. the 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example 1
Referring to fig. 1, the parameters of the fixed-focus lens of the present embodiment are as follows:
total lens length: 18.173 mm; the field angle: 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 3 below.
TABLE 3
The aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 As shown in table 4 below.
TABLE 4
As shown in fig. 1 and tables 1 to 4, the fixed-focus lens of the present embodiment can effectively balance the high and low temperature performance of the lens, chromatic aberration and aberration of the optical system, and achieve a 158 ° ultra-wide angle design and a high-quality imaging performance of 8M (800 ten thousand pixels) resolution, and has the characteristics of miniaturization, low cost, and light weight, and at the same time, the fixed-focus lens is stable in imaging in a high and low temperature environment, does not generate virtual focus in a temperature range of-40 ℃ to 80 ℃, achieves infrared confocal performance and infrared imaging performance, and has 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: 18.658 mm; the field angle: 158 deg.. The stop STO is located on the image-side surface of the fourth lens L4.
The relevant parameters of each lens in the fixed-focus lens of the embodiment include: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number, as shown in table 5 below.
TABLE 5
The aspheric surface coefficients of the aspheric surface lenses of the prime lens of the embodiment include: conic constant of the surfaceK. Fourth order aspheric coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 As shown in table 6 below.
TABLE 6
As shown in fig. 2 and tables 1, 2, 5, and 6, the fixed-focus lens of the present embodiment can effectively balance the high and low temperature performance of the lens, chromatic aberration and aberration of the optical system, and achieve a high-quality imaging performance of 158 ° ultra-wide design and 8M (800 ten thousand pixels) resolution, and has the characteristics of miniaturization, low cost, and light weight, and meanwhile, the imaging is stable in the high and low temperature environment, no virtual focus exists in the temperature range of-40 ℃ to 80 ℃, the infrared confocal performance and the infrared imaging performance are achieved, and the assembly tolerance sensitivity is low.
Example 3
Referring to fig. 3, the parameters of the fixed-focus lens of the present embodiment are as follows:
total lens length: 18.898 mm; the field angle: 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 7 below.
| Number of noodles | Surface type | R value | Thickness of | 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 7
The aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 As shown in table 8 below.
TABLE 8
As shown in fig. 3 and tables 1, 2, 7, and 8, the fixed-focus lens of the present embodiment can effectively balance the high and low temperature performance of the lens, chromatic aberration and aberration of the optical system, and achieve a 158 ° ultra-wide angle design and a high quality imaging performance of 8M (800 ten thousand pixels) resolution, and has the characteristics of miniaturization, low cost, and light weight, and at the same time, the imaging is stable in a high and low temperature environment, and no virtual focus exists in a temperature range of-40 ℃ to 80 ℃, and the performance of infrared confocal and infrared imaging without virtual focus is achieved, and the assembly tolerance sensitivity is low.
Example 4
Referring to fig. 4, the parameters of the fixed-focus lens of the present embodiment are as follows:
total lens length: 18.522 mm; the field angle: 158 deg.. The stop STO is located on the object 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 9 below.
| Number of noodles | Surface type | R value | Thickness of | Refractive index Nd | Abbe number Vd |
| 1 | Aspherical surface | -12.935 | 1.313 | 1.54 | 55.7 |
| 2 | Aspherical surface | 2.520 | 1.684 | ||
| 3 | Aspherical surface | -5.243 | 0.600 | 1.54 | 55.7 |
| 4 | Aspherical surface | 5.933 | 0.100 | ||
| 5 | Aspherical surface | 3.261 | 3.300 | 1.64 | 23.5 |
| 6 | Aspherical surface | 8.617 | 0.111 | ||
| 7(STO) | Spherical surface | 5.922 | 2.926 | 1.5 | 81.6 |
| 8 | Spherical surface | -4.585 | 0.100 | ||
| 9 | Aspherical surface | 6.431 | 2.464 | 1.54 | 55.7 |
| 10 | Aspherical surface | -2.869 | 0.098 | ||
| 11 | Aspherical surface | -2.344 | 0.785 | 1.64 | 23.5 |
| 12 | Aspherical surface | -4.426 | 4.041 | ||
| 13 | Spherical surface | Infinity | 0.800 | 1.52 | 64.2 |
| 14 | Spherical surface | Infinity | 0.200 | ||
| Image plane | Spherical surface | Infinity | 0.000 |
TABLE 9
The aspheric surface coefficients of the aspheric surface lenses of the prime lens of the embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 As shown in table 10 below.
Watch 10
As shown in fig. 4 and tables 1, 2, 9, and 10, the fixed-focus lens of the present embodiment can effectively balance the high and low temperature performance of the lens, chromatic aberration and aberration of the optical system, and achieve a high-quality imaging performance of 158 ° ultra-wide design and 8M (800 ten thousand pixels) resolution, and has the characteristics of miniaturization, low cost, and light weight, and meanwhile, the imaging is stable in the high and low temperature environment, no virtual focus exists in the temperature range of-40 ℃ to 80 ℃, the infrared confocal performance and the infrared imaging performance are achieved, and the assembly tolerance sensitivity is low.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. 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: a first lens (L1) having negative power, a second lens (L2) having negative power, a third lens (L3) having positive power, a fourth lens (L4) having positive power, a fifth lens (L5) having positive power, and a sixth lens (L6) having negative power, which are arranged in this order from the object side to the image side along the optical axis, the third lens (L3) being a paraxial region convex-concave type lens, the fourth lens (L4) being a convex-convex lens, the first lens (L1) being an aspherical lens, the fourth lens (L4) being a spherical lens, characterized in that the second lens (L2) is a paraxial region concave-concave type lens, and a focal length F2 of the second lens (L2) and a focal length F1 of the first lens (L1) satisfy the following relation: F2/F1 is more than 0.7 and less than 1.5.
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) is a paraxial concave-convex lens or a paraxial concave-concave lens;
the fifth lens (L5) is a paraxial convex lens;
the sixth lens (L6) is a paraxial concave-convex lens.
3. The prime 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 aspheric lenses.
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 fixed focus lens according to claim 1, further comprising a Stop (STO) located between the third lens (L3) and the fourth lens (L4), on an object-side surface of the fourth lens (L4), on an image-side surface of the fourth lens (L4), or between the fourth lens (L4) and the fifth lens (L5).
6. The prime lens according to any one of claims 1 to 5, wherein the total optical length TTL of the prime lens and the focal length F of the prime lens satisfy the relation: TTL/F is more than 5.9 and less than 8.9.
7. A fixed-focus lens according to any one of claims 1 to 5, wherein 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 more than 1.8 and less than 2.4.
8. The prime lens according to any one of claims 1 to 5, wherein the focal length F4 of the fourth lens (L4) and the focal length F1 of the first lens (L1) satisfy the relation: -1.6 < F4/F1 < -0.6.
9. The prime lens according to any one of claims 1 to 5, wherein the focal length F5 of the fifth lens (L5) and the focal length F of the prime lens satisfy the relation: F5/F is more than 1.4 and less than 1.8.
10. The prime lens according to any one of claims 1 to 5, wherein the focal length F56 of the fifth lens (L5) and the sixth lens (L6) and the focal length F of the prime lens satisfy the relation: F56/F is more than 3.0 and less than 3.5.
11. The prime lens according to any one of claims 1 to 5, wherein the distance between the image-side surface of the first lens (L1) and the center length d12 of the object-side surface of the second lens (L2) and the focal length F of the prime lens satisfies the relation: d12/F is more than 0.8 and less than 1.6.
12. The prime lens according to any one of claims 1 to 5, wherein the distance between the image-side surface of the first lens (L1) and the center length d12 of the object-side surface of the second lens (L2), the distance between the image-side surface of the third lens (L3) and the center length d34 of the object-side surface of the fourth lens (L4), and the focal length F56 of the fifth lens (L5) and the sixth lens (L6) satisfy the following relations: 0.6 < (d12+ d34)/F56 < 0.9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220991685.0U CN217213312U (en) | 2022-04-26 | 2022-04-26 | Fixed focus lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220991685.0U CN217213312U (en) | 2022-04-26 | 2022-04-26 | Fixed focus lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217213312U true CN217213312U (en) | 2022-08-16 |
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