CN114879350A - Fixed focus lens - Google Patents
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- CN114879350A CN114879350A CN202210653924.6A CN202210653924A CN114879350A CN 114879350 A CN114879350 A CN 114879350A CN 202210653924 A CN202210653924 A CN 202210653924A CN 114879350 A CN114879350 A CN 114879350A
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Abstract
The invention relates to a fixed focus lens, which sequentially comprises the following components in the direction from an object side to an image side along an optical axis: the fixed-focus 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, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens and a ninth lens, wherein the fourth lens is a convex lens, the focal power of the eighth lens is negative, the focal power of the ninth lens is positive, or the focal power of the eighth lens is positive, the focal power of the ninth lens is negative, the fixed-focus lens further comprises a diaphragm, the diaphragm is positioned between the second lens and the third lens, the fifth lens is a convex lens or a plano-convex lens, and the ninth lens is a paraxial region convex lens or a paraxial region convex lens. The lens realizes that the 4K image quality and the relative illumination are more than 40 percent, the imaging is clear within the temperature range of minus 40 ℃ to plus 80 ℃, the maximum aperture Fno number reaches 0.9, and the maximum imaging target surface reaches 14.06 mm.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to a fixed-focus lens.
Background
With the development of the security monitoring field, the requirements on the target surface, the image quality, the aperture and the like of the security lens are higher and higher. However, the existing large-aperture security lens can only be adapted to 1/2.7' image plane. For a larger target surface, the image quality of the conventional fixed-focus lens is obviously reduced. Therefore, in view of the above deficiencies of the prior art, there is a need for a fixed focus lens with a large aperture, a large target surface, and 4K resolution, which is compatible with multiple types of photosensitive chips.
Disclosure of Invention
In order to solve the problems of the prior art, the present invention provides a fixed focus lens.
To achieve the above object, the present invention provides a fixed focus lens, sequentially including, along an optical axis from an object side to an image side: the fixed-focus 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, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens and a ninth lens, wherein the fourth lens is a convex lens, the focal power of the eighth lens is negative, the focal power of the ninth lens is positive, or the focal power of the eighth lens is positive, the focal power of the ninth lens is negative, the fixed-focus lens further comprises a diaphragm, the diaphragm is positioned between the second lens and the third lens, the fifth lens is a convex lens or a plano-convex lens, and the ninth lens is a paraxial region convex lens or a paraxial region convex lens.
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 convex-concave lens;
the second lens is a concave-convex lens;
the third lens is a convex lens;
the sixth lens is a concave-concave lens;
the seventh lens is a convex lens;
the eighth lens is a meniscus lens.
According to an aspect of the present invention, the first lens, the second lens, the fourth lens, the eighth lens, and the ninth lens are all aspheric lenses;
the third lens, the fifth lens, the sixth lens and the seventh lens are all spherical lenses.
According to an aspect of the present invention, the first lens, the second lens, the fourth lens, the eighth lens and the ninth lens are all plastic lenses;
the third lens, the fifth lens, the sixth lens and the seventh lens are all glass lenses.
According to an aspect of the present invention, the fifth lens, the sixth lens and the seventh lens are cemented to constitute one cemented lens.
According to an aspect of the invention, the focal length of the first lens F1 and the focal length of the second lens F2 satisfy: F2/F1 is more than or equal to 0.9 and less than or equal to 1.56.
According to one aspect of the invention, a distance D23 from the image-side surface of the second lens to the object-side surface of the third lens and a distance BFL from the image-side surface of the ninth lens to the image plane satisfy: D23/BFL is more than or equal to 0.21 and less than or equal to 0.82.
According to an aspect of the present invention, a focal length F3 of the third lens and a focal length F of the prime lens satisfy: F3/F is more than or equal to 1.83 and less than or equal to 3.57.
According to one aspect of the invention, the thickness and D567 of the fifth lens, the sixth lens and the seventh lens and the distance TTL from the object side surface to the image plane of the first lens satisfy: D567/TTL is more than or equal to 0.21 and less than or equal to 0.25.
According to one aspect of the invention, the refractive index Nd2 and the Abbe number Vd2 of the second lens respectively satisfy: nd2 is more than or equal to 1.61 and less than or equal to 1.67; 19.25 is less than or equal to Vd2 is less than or equal to 25.58.
According to an aspect of the invention, the refractive index Nd8 and the abbe number Vd8 of the eighth lens respectively satisfy: nd8 is more than or equal to 1.61 and less than or equal to 1.64; vd8 is more than or equal to 23.35 and less than or equal to 25.58.
According to one aspect of the invention, the refractive index Nd3 and the Abbe number Vd3 of the third lens respectively satisfy: nd3 is more than or equal to 1.85 and less than or equal to 2; 19.32 is less than or equal to Vd3 is less than or equal to 23.78.
According to an aspect of the invention, the refractive index Nd6 and the abbe number Vd6 of the sixth lens respectively satisfy: nd6 is more than or equal to 1.81 and less than or equal to 1.85; 23.78 is less than or equal to Vd6 is less than or equal to 25.48.
According to one aspect of the invention, the refractive index Nd7 and the Abbe number Vd7 of the seventh lens respectively satisfy: nd7 is more than or equal to 1.59 and less than or equal to 1.8; 46.57 is more than or equal to Vd7 is more than or equal to 68.62.
According to one aspect of the present invention, a distance D78 from an image-side surface of the seventh lens element to an object-side surface of the eighth lens element and a distance TTL from an object-side surface of the first lens element to an image plane satisfy: D78/TTL is more than or equal to 0 and less than or equal to 0.08.
According to an aspect of the present invention, a focal length F8 of the eighth lens and a focal length F9 of the ninth lens satisfy: F8/F9 of-2.41 is less than or equal to-0.03.
According to one aspect of the invention, the aperture diameter D of the object side surface of the first lens and the distance TTL from the object side surface of the first lens to the image plane satisfy: D/TTL is more than or equal to 0.23 and less than or equal to 0.32.
According to the scheme of the invention, the optical framework is adopted, the different focal powers and the different shapes of the nine lenses are reasonably optimized and configured, the parameters such as specific materials, surface types, refractive indexes, dispersion coefficients, focal lengths and the like are reasonably configured for the lenses, and the cemented lens is arranged, so that the prime lens realizes the high imaging performance of large aperture, large target surface, high resolving power, relative illumination of more than 40 percent and clear imaging in the temperature range of-40 ℃ to +80 ℃. Specifically, the number of the diaphragm Fno belongs to [0.9, 1.1], the height of an image plane H belongs to [6.6, 14.06], the maximum imaging target surface can reach 14.06mm, and the diaphragm can be adaptive and compatible with multiple types of photosensitive chips from 1/2.7 'to 1/1.2' and the like; the maximum aperture Fno number can reach 0.9, and the micro-light ring is suitable for micro-light environments with low brightness. In addition, the lens has a function of changing a diaphragm, and can be compatible with external equipment such as a spherical cover.
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 is a schematic structural view of a fixed focus lens according to a first embodiment of the present invention;
fig. 2 is a schematic view showing a structure of a fixed focus lens according to a second embodiment of the present invention;
fig. 3 is a schematic view showing a structure of a fixed focus lens according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fixed focus lens according to a fourth embodiment of the present invention;
fig. 5 schematically shows a structure diagram of a fixed focus lens according to a fifth embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
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 for convenience. 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 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 invention is defined by the claims.
Referring to fig. 1 to 5, an embodiment of the present invention provides a fixed focus lens, sequentially including, along an optical axis from an object side to an image side: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a parallel plate CG. Among them, the first lens L1, the second lens L2, and the sixth lens L6 all have negative optical power, and the third lens L3, the fourth lens L4, the fifth lens L5, and the seventh lens L7 all have positive optical power. In some embodiments of the present invention, the power of the eighth lens L8 is negative and the power of the ninth lens L9 is positive, or, in other embodiments of the present invention, the power of the eighth lens L8 is positive and the power of the ninth lens L9 is negative.
In the embodiment of the present invention, the first lens element L1 has a convex shape at the object-side paraxial region and a concave shape at the image-side paraxial region. The object-side surface of the second lens L2 is concave, and the image-side surface thereof is convex. The object-side and image-side surfaces of the third lens L3, the fourth lens L4, and the seventh lens L7 are all convex in shape. The fifth lens L5 has a convex or flat object-side shape and a convex image-side shape. The object-side surface and the image-side surface of the sixth lens L6 are both concave in shape. The eighth lens L8 has a concave object-side surface and a convex image-side surface. The ninth lens L9 has a convex shape at the object side paraxial region and a concave or convex shape at the image side paraxial region.
Through the scheme, different focal powers and different shapes of nine lenses are reasonably and optimally configured, so that the Fno number of the fixed-focus lens belongs to [0.9, 1.1], the image surface height H belongs to [6.6, 14.06], the large aperture, the large target surface, the 4K resolving power, the relative illumination more than 40 percent and the high imaging performance of clear imaging in the temperature range of-40 ℃ to +80 ℃ are realized. And the method is suitable for the environment with lower brightness, and is adaptive to and compatible with multiple types of photosensitive chips from 1/2.7 'to 1/1.2' and the like.
In the embodiment of the present invention, the first lens L1, the second lens L2, the fourth lens L4, the eighth lens L8, and the ninth lens L9 are all aspheric lenses, and the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all spherical lenses.
In the embodiment of the invention, the first lens L1, the second lens L2, the fourth lens L4, the eighth lens L8 and the ninth lens L9 are all plastic lenses, and the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all glass lenses. Through the specific mixing of the lens glass and the plastic material, the unstable correction of high-temperature and low-temperature imaging and the compensation of temperature drift can be realized, and the cost of the lens is reduced.
In the embodiment of the present invention, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are cemented to form one cemented lens. The three cemented lenses can correct the external aberrations such as field curvature, coma aberration, astigmatism and the like, and improve the imaging performance of the lens.
In the embodiment of the present invention, the focal length F1 of the first lens L1 and the focal length F2 of the second lens L2 satisfy: F2/F1 is more than or equal to 0.9 and less than or equal to 1.56, so that more light rays can enter an optical system behind the lens, and the illumination is increased.
In the embodiment of the present invention, the distance D23 from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 and the distance BFL from the image-side surface of the ninth lens L9 to the image plane IMA satisfy: D23/BFL is more than or equal to 0.21 and less than or equal to 0.82. So set up for camera lens air interval is sufficient and insensitive, can realize the function of adjusting diaphragm STO.
In the embodiment of the present invention, the focal length F3 of the third lens L3 and the focal length F of the fixed-focus lens satisfy: F3/F is more than or equal to 1.83 and less than or equal to 3.57, which is beneficial to enlarging the imaging target surface.
In the embodiment of the present invention, the thicknesses and the distances TTL (i.e., the total optical length of the fixed focus lens) from the object side surface of the fifth lens element L5, the sixth lens element L6, and the seventh lens element L7 to the image plane IMA of D567 and the first lens element L1 satisfy: D567/TTL is more than or equal to 0.21 and less than or equal to 0.25, so that the sensitivity of the lens optical system can be effectively reduced, the image quality is improved, and the yield is improved.
In the embodiment of the invention, the refractive index Nd2 and the Abbe number Vd2 of the second lens L2 respectively satisfy: nd2 is more than or equal to 1.61 and less than or equal to 1.67; 19.25 is less than or equal to Vd2 is less than or equal to 25.58. The refractive index Nd8 and the abbe number Vd8 of the eighth lens L8 satisfy: nd8 is more than or equal to 1.61 and less than or equal to 1.64; vd8 is more than or equal to 23.35 and less than or equal to 25.58. Through reasonable setting of the refractive index and the dispersion coefficient of the second lens L2 and the eighth lens L8, the resolving power of the lens can be improved, and the 4K image quality is achieved.
In the embodiment of the invention, the refractive index Nd3 and the Abbe number Vd3 of the third lens L3 respectively satisfy: nd3 is more than or equal to 1.85 and less than or equal to 2, and Vd3 is more than or equal to 19.32 and less than or equal to 23.78. The refractive index Nd6 and the abbe number Vd6 of the sixth lens L6 satisfy: nd6 is more than or equal to 1.81 and less than or equal to 1.85; 23.78 is less than or equal to Vd6 is less than or equal to 25.48. The refractive index Nd7 and the abbe number Vd7 of the seventh lens L7 satisfy: nd7 is more than or equal to 1.59 and less than or equal to 1.8; 46.57 is more than or equal to Vd7 is more than or equal to 68.62. By reasonably setting the refractive index and the dispersion coefficient of the third lens L3, the sixth lens L6 and the seventh lens L7, a large aperture is realized, and the combination of the three glass lenses can correct chromatic aberration of magnification and axial chromatic aberration.
In the embodiment of the present invention, the distance D78 from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8 and the distance TTL from the object-side surface of the first lens L1 to the image plane IMA satisfy: D78/TTL is more than or equal to 0 and less than or equal to 0.08, and smooth transition of light rays near the seventh lens L7 and the eighth lens L8 is facilitated, so that the resolution of the lens is improved.
In the embodiment of the present invention, the focal length F8 of the eighth lens L8 and the focal length F9 of the ninth lens L9 satisfy: F8/F9 of-2.41. ltoreq. F8/0.03, and the aberration of the optical system can be further reduced.
In the embodiment of the invention, the aperture diameter D of the object side surface of the first lens L1 and the distance TTL from the object side surface of the first lens L1 to the image plane IMA satisfy: D/TTL is more than or equal to 0.23 and less than or equal to 0.32. The arrangement is compatible with external equipment such as a spherical cover.
In summary, the optical architecture according to the embodiments of the present invention can enable the fixed focus lens to achieve a large aperture, a large target surface, a high resolution, a relative illumination of more than 40%, and a high imaging performance with clear imaging in a temperature range of-40 ℃ to +80 ℃. Specifically, the lens resolution reaches 4K image quality; the maximum imaging target surface can reach 14.06mm, and the imaging device can be adapted and compatible with various photosensitive chips from 1/2.7 'to 1/1.2', and the like; the maximum number of the apertures Fno is 0.9, and the micro-light ring is suitable for a micro-light environment with low brightness. In addition, the lens can also realize the function of variable diaphragm and is compatible with external equipment such as a spherical cover and the like.
The following five embodiments are used to specifically describe the fixed focus lens of the present invention in conjunction with the accompanying drawings and tables. In the following embodiments, the present invention will be described with the stop STO as one surface, the parallel plate CG as two surfaces, and the image plane IMA as one surface.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
In an embodiment of the present invention, the 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.
First embodiment
Referring to fig. 1, the parameters of the fixed-focus lens of the present embodiment are as follows:
FNO: 1.08; total optical length TTL: 52 mm. The shapes of the object-side surface and the image-side surface of the fifth lens L5 are both convex; the ninth lens L9 has a convex object-side surface and a concave image-side surface. The eighth lens L8 has positive power, and the ninth lens L9 has negative power.
Table 2 lists the relevant parameters of each lens in the fixed-focus lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
| Number of noodles | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| S1 | Aspherical surface | 13.19 | 2.00 | 1.54 | 55.71 |
| S2 | Aspherical surface | 5.57 | 3.88 | ||
| S3 | Aspherical surface | -7.49 | 2.42 | 1.61 | 25.58 |
| S4 | Aspherical surface | -13.86 | 3.19 | ||
| STO | Spherical surface | Infinity | 0.02 | ||
| S6 | Spherical surface | 35.94 | 5.92 | 1.85 | 23.78 |
| S7 | Spherical surface | -28.15 | 3.61 | ||
| S8 | Aspherical surface | 146.96 | 2.65 | 1.54 | 55.71 |
| S9 | Aspherical surface | -20.68 | 0.10 | ||
| S10 | Spherical surface | 42.48 | 5.49 | 1.62 | 63.41 |
| S11 | Spherical surface | -12.65 | 0.80 | 1.85 | 23.78 |
| S12 | Spherical surface | 16.54 | 6.00 | 1.59 | 68.62 |
| S13 | Spherical surface | -19.00 | 1.46 | ||
| S14 | Aspherical surface | -23.45 | 3.41 | 1.64 | 23.35 |
| S15 | Aspherical surface | -14.47 | 0.10 | ||
| S16 | Aspherical surface | 9.97 | 3.67 | 1.54 | 55.71 |
| S17 | Aspherical surface | 7.82 | 6.30 | ||
| S18 | Spherical surface | Infinity | 0.80 | 1.52 | 64.20 |
| S19 | Spherical surface | Infinity | 0.20 | ||
| IMA | Spherical surface | Infinity | 0.00 |
TABLE 2
Table 3 lists aspheric coefficients of the aspherical lenses of the fixed focus lens of the present embodiment, including: 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 And fourteen order aspheric coefficients A 14 。
TABLE 3
As shown in fig. 1 and tables 1 to 3, the fixed-focus lens of the present embodiment achieves a large aperture, a large target surface, a high resolution, a relative illumination of 40% or more, and a high imaging performance with a clear image in a temperature range of-40 ℃ to +80 ℃. Specifically, the lens resolution reaches 4K image quality; the imaging target surface can reach 12.8mm, and can be adapted and compatible with various photosensitive chips from 1/2.7 'to 1/1.2', and the like; the number of the large aperture Fno is 1.08, and the micro-light ring is suitable for a micro-light environment with low brightness. In addition, the lens can also realize the function of variable diaphragm and is compatible with external equipment such as a spherical cover and the like.
Second embodiment
Referring to fig. 2, the parameters of the fixed-focus lens of the present embodiment are as follows:
FNO: 0.9; total optical length TTL: 50.6 mm. The shapes of the object-side surface and the image-side surface of the fifth lens L5 are both convex; the ninth lens L9 has a convex object-side surface and a concave image-side surface. The eighth lens L8 has positive power, and the ninth lens L9 has negative power.
Table 4 lists the relevant parameters of each lens in the fixed-focus lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
| Number of noodles | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| S1 | Aspherical surface | 11.68 | 2.63 | 1.54 | 55.71 |
| S2 | Aspherical surface | 5.23 | 4.39 | ||
| S3 | Aspherical surface | -5.66 | 1.83 | 1.61 | 25.58 |
| S4 | Aspherical surface | -9.14 | 1.51 | ||
| STO | Spherical surface | Infinity | 0.02 | ||
| S6 | Spherical surface | 39.57 | 6.00 | 1.85 | 23.78 |
| S7 | Spherical surface | -23.69 | 2.87 | ||
| S8 | Aspherical surface | 188.31 | 3.01 | 1.54 | 55.71 |
| S9 | Aspherical surface | -18.69 | 0.10 | ||
| S10 | Spherical surface | 47.23 | 5.98 | 1.62 | 63.41 |
| S11 | Spherical surface | -13.74 | 0.60 | 1.85 | 23.78 |
| S12 | Spherical surface | 12.77 | 5.96 | 1.59 | 68.62 |
| S13 | Spherical surface | -19.59 | 0.18 | ||
| S14 | Aspherical surface | -23.01 | 4.71 | 1.64 | 23.35 |
| S15 | Aspherical surface | -12.60 | 0.10 | ||
| S16 | Aspherical surface | 8.63 | 3.39 | 1.54 | 55.71 |
| S17 | Aspherical surface | 7.34 | 6.34 | ||
| S18 | Spherical surface | Infinity | 0.80 | 1.52 | 64.20 |
| S19 | Spherical surface | Infinity | 0.20 | ||
| IMA | Spherical surface | Infinity | 0.00 |
TABLE 4
Table 5 lists aspheric coefficients of each aspheric lens of the fixed-focus lens of the present embodiment, including: 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 And fourteen order aspheric coefficients A 14 。
TABLE 5
As shown in fig. 2 and tables 1, 4, and 5, the fixed-focus lens of the present embodiment achieves a large aperture, a large target surface, a high resolution, a relative illumination of 40% or more, and a high imaging performance with a clear image in a temperature range of-40 ℃ to +80 ℃. Specifically, the lens resolution reaches 4K image quality; the imaging target surface can reach 12.8mm, and can be adapted and compatible with various photosensitive chips from 1/2.7 'to 1/1.2', and the like; the number of the large aperture Fno is 0.9, and the micro-light ring is suitable for a micro-light environment with low brightness. In addition, the lens can also realize the function of variable diaphragm and is compatible with external equipment such as a spherical cover and the like.
Third embodiment
Referring to fig. 3, the parameters of the fixed-focus lens of the present embodiment are as follows:
FNO: 1.08; total optical length TTL: 50 mm. The shapes of the object-side surface and the image-side surface of the fifth lens L5 are both convex; the ninth lens L9 has a convex object-side surface and a concave image-side surface. The eighth lens L8 has a negative power, and the ninth lens L9 has a positive power.
Table 6 lists relevant parameters of each lens in the fixed-focus lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 6
Table 7 lists aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspheric surfaceCoefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 。
TABLE 7
As shown in fig. 3 and tables 1, 6, and 7, the fixed-focus lens of the present embodiment achieves a large aperture, a large target surface, a high resolution, a relative illumination of 40% or more, and a high imaging performance with a clear image in a temperature range of-40 ℃ to +80 ℃. Specifically, the lens resolution reaches 4K image quality; the imaging target surface can reach 11.14mm, and can be adapted and compatible with various photosensitive chips from 1/2.7 'to 1/1.2', and the like; the number of the large aperture Fno is 1.08, and the micro-light ring is suitable for a micro-light environment with low brightness. In addition, the lens can also realize the function of diaphragm variation and is compatible with external equipment such as a spherical cover and the like.
Fourth embodiment
Referring to fig. 4, the parameters of the fixed-focus lens of the present embodiment are as follows:
FNO: 1.08; total optical length TTL: 58.5 mm. The object-side surface of the fifth lens L5 is a plane, and the image-side surface thereof is convex; the object-side surface and the image-side surface of the ninth lens L9 are both convex in shape. The eighth lens L8 has a negative power, and the ninth lens L9 has a positive power.
Table 8 lists the relevant parameters of each lens in the fixed focus lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 8
Table 9 lists aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment, including: 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 And fourteen order aspheric coefficients A 14 。
TABLE 9
As shown in fig. 4 and tables 1, 8, and 9, the fixed-focus lens according to the present embodiment achieves a large aperture, a large target surface, a high resolution, a relative illumination of 40% or more, and a high imaging performance with a clear image in a temperature range of-40 ℃ to +80 ℃. Specifically, the lens resolution reaches 4K image quality; the imaging target surface can reach 6.6mm, and can be adapted and compatible with various photosensitive chips from 1/2.7 'to 1/1.2', and the like; the number of the large aperture Fno is 1.08, and the micro-light ring is suitable for a micro-light environment with low brightness. In addition, the lens can also realize the function of variable diaphragm and is compatible with external equipment such as a spherical cover and the like.
Fifth embodiment
Referring to fig. 5, the parameters of the fixed-focus lens of the present embodiment are as follows:
FNO: 1.1; total optical length TTL: 52 mm. The object-side surface of the fifth lens L5 is a plane, and the image-side surface thereof is convex; the ninth lens L9 has a convex object-side surface and a concave image-side surface. The eighth lens L8 has a negative power, and the ninth lens L9 has a positive power.
Table 10 lists the relevant parameters of each lens in the fixed focus lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Watch 10
Table 11 lists aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment, including: 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 And fourteen order aspheric coefficients A 14 。
TABLE 11
As shown in fig. 5 and tables 1, 10, and 11, the fixed-focus lens according to the present embodiment achieves a large aperture, a large target surface, a high resolution, a relative illumination of 40% or more, and a high imaging performance with a clear image in a temperature range of-40 ℃ to +80 ℃. Specifically, the lens resolution reaches 4K image quality; the maximum imaging target surface is 14.06mm, and the device can be adapted and compatible with multiple types of photosensitive chips from 1/2.7 'to 1/1.2', and the like; the number of the large aperture Fno is 1.1, and the micro-light ring is suitable for a micro-light environment with low brightness. In addition, the lens can also realize the function of variable diaphragm and is compatible with external equipment such as a spherical cover and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A fixed focus lens includes, in order from an object side to an image side along an optical axis: 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, a seventh lens (L7) with positive focal power, an eighth lens (L8) and a ninth lens (L9), wherein the fourth lens (L4) is a convex lens, characterized in that,
the optical power of the eighth lens (L8) is negative and the optical power of the ninth lens (L9) is positive, or the optical power of the eighth lens (L8) is positive and the optical power of the ninth lens (L9) is negative,
the prime lens further including a Stop (STO) located between the second lens (L2) and the third lens (L3),
the fifth lens (L5) is a convex-convex lens or a plano-convex lens, and the ninth lens (L9) is a paraxial region convex-concave lens or a paraxial region convex-convex lens.
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 convex-concave lens;
the second lens (L2) is a meniscus lens;
the third lens (L3) is a convex lens;
the sixth lens (L6) is a concave-concave lens;
the seventh lens (L7) is a convex lens;
the eighth lens (L8) is a meniscus lens.
3. The prime lens according to claim 1, wherein the first lens (L1), the second lens (L2), the fourth lens (L4), the eighth lens (L8), and the ninth lens (L9) are each an aspherical lens;
the third lens (L3), the fifth lens (L5), the sixth lens (L6), and the seventh lens (L7) are all spherical lenses.
4. The prime lens according to claim 1, wherein the first lens (L1), the second lens (L2), the fourth lens (L4), the eighth lens (L8) and the ninth lens (L9) are all plastic lenses;
the third lens (L3), the fifth lens (L5), the sixth lens (L6), and the seventh lens (L7) are all glass lenses.
5. The prime lens according to claim 1, wherein the fifth lens (L5), the sixth lens (L6) and the seventh lens (L7) are cemented to form one cemented lens.
6. The prime lens according to any one of claims 1 to 5, wherein the focal length F1 of the first lens (L1) and the focal length F2 of the second lens (L2) satisfy: F2/F1 is more than or equal to 0.9 and less than or equal to 1.56.
7. A fixed focus lens as claimed in any one of claims 1 to 5, characterized in that the distance D23 from the image-side face of the second lens (L2) to the object-side face of the third lens (L3) and the distance BFL from the image-side face of the ninth lens (L9) to the image plane (IMA) satisfy: D23/BFL is more than or equal to 0.21 and less than or equal to 0.82.
8. The prime lens according to any one of claims 1 to 5, wherein the focal length F3 of the third lens (L3) and the focal length F of the prime lens satisfy: F3/F is more than or equal to 1.83 and less than or equal to 3.57.
9. The prime lens according to any one of claims 1 to 5, wherein the thicknesses of the fifth lens (L5), the sixth lens (L6) and the seventh lens (L7) and the distance TTL between D567 and an object-side surface of the first lens (L1) and an image plane (IMA) satisfy: D567/TTL is more than or equal to 0.21 and less than or equal to 0.25.
10. A fixed focus lens according to any of claims 1 to 5, wherein the refractive index Nd2 and the Abbe number Vd2 of the second lens (L2) satisfy: nd2 is more than or equal to 1.61 and less than or equal to 1.67; 19.25 is less than or equal to Vd2 is less than or equal to 25.58.
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