CN220232090U - Fixed focus lens - Google Patents

Fixed focus lens Download PDF

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Publication number
CN220232090U
CN220232090U CN202321450358.5U CN202321450358U CN220232090U CN 220232090 U CN220232090 U CN 220232090U CN 202321450358 U CN202321450358 U CN 202321450358U CN 220232090 U CN220232090 U CN 220232090U
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Prior art keywords
lens
fixed focus
focal length
focus lens
effective focal
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CN202321450358.5U
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杨俊华
翟林燕
梁伟朝
应永茂
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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Abstract

The utility model relates to a fixed focus lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens along the direction from an object side to an image side, wherein the first lens is a convex-concave lens with negative focal power; the second lens is a concave-convex lens with negative focal power; the third lens is a convex-convex lens with positive focal power; the fourth lens is a convex-convex lens with positive focal power; the fifth lens is a concave-convex lens with negative focal power; the effective focal length F1 of the first lens and the total effective focal length F of the fixed focus lens satisfy: F1/F is more than or equal to 1.80 and less than or equal to 2.01.

Description

Fixed focus lens
Technical Field
The utility model relates to the technical field of optics, in particular to a fixed-focus lens.
Background
With the continuous upgrading development of internet technology, video shots are widely applied to the fields of video conferences, online teaching, network video shooting and the like, and are more and more valued by the masses, so that the requirements on the image quality of the video shots are higher and higher.
Video conference shots on the market today still have the following drawbacks:
1. the existing video conference lens configuration form is difficult to correct system aberration well, and imaging quality is poor.
2. The existing video conference lens has the problems of overlong total length and larger volume, so that the overall cost and weight of the lens are overhigh.
3. The existing video conference lens often has the problem that the lens distortion management and control is not good enough, so that the shot picture is obviously deformed, and the processing of the later-stage image is affected.
Therefore, in summary, designing a low-distortion, small-volume, high-resolution and low-cost fixed focus lens has become a market trend.
Disclosure of Invention
In view of the above, the present utility model aims to provide a fixed focus lens, which solves the problem that the existing fixed focus lens cannot achieve low distortion, small volume, high resolution and low cost.
The fixed focus lens provided by the embodiment of the utility model comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence along the direction from an object side to an image side, wherein the first lens is a convex-concave lens with negative focal power; the second lens is a concave-convex lens with negative focal power; the third lens is a convex-convex lens with positive focal power; the fourth lens is a convex-convex lens with positive focal power; the fifth lens is a concave-convex lens with negative focal power; the effective focal length F1 of the first lens and the total effective focal length F of the fixed focus lens satisfy: F1/F is more than or equal to 1.80 and less than or equal to 2.01.
In a preferred embodiment of the present utility model, the object-side radius of curvature R11 of the first lens and the effective focal length F1 of the first lens satisfy: R11/F1 is less than or equal to-1.38 and less than or equal to-0.24.
In a preferred embodiment of the present utility model, the effective focal length F2 of the second lens and the total effective focal length F of the fixed focus lens satisfy: -4.09.ltoreq.F2/F.ltoreq.3.84.
In a preferred embodiment of the present utility model, the combined effective focal length F12 of the first lens and the second lens and the total effective focal length F of the fixed focus lens satisfy: F12/F is less than or equal to-1.46 and less than or equal to-1.33.
In a preferred embodiment of the present utility model, the object-side radius of curvature R21 of the second lens and the image-side radius of curvature R22 of the second lens satisfy:
-0.22≤(R21-R22)/(R21+R22)≤-0.16。
in a preferred embodiment of the present utility model, the image side radius of curvature R22 of the second lens, the object side radius of curvature R31 of the third lens, the image side radius of curvature R32 of the third lens, and the combined effective focal length F23 of the second lens and the third lens satisfy:
-0.84≤(R22+R31+R32)/F23≤-0.30。
in a preferred embodiment of the present utility model, the combined effective focal length F345 of the third lens to the fifth lens and the total effective focal length F of the fixed focus lens satisfy: F345/F is more than or equal to 0.91 and less than or equal to 1.01.
In a preferred embodiment of the present utility model, a center thickness CT3 of the third lens element on the optical axis, a center thickness CT4 of the fourth lens element on the optical axis, and a center distance T34 between the object side surface of the third lens element and the image side surface of the fourth lens element on the optical axis satisfy:
0.59≤(CT3+CT4)/T34≤0.69。
in a preferred embodiment of the present utility model, the object-side radius of curvature R41 of the fourth lens, the image-side radius of curvature R42 of the fourth lens, and the center thickness CT4 of the fourth lens on the optical axis satisfy: -0.28.ltoreq.R41+R42)/CT 4.ltoreq.3.07.
In a preferred embodiment of the present utility model, the combined effective focal length F45 of the fourth lens to the fifth lens and the total effective focal length F of the fixed focus lens satisfy: F45/F is less than or equal to 2.1 and less than or equal to 3.18.
In a preferred embodiment of the present utility model, a maximum value CTmax of the center thickness on the optical axis in all lenses of the fixed focus lens and a minimum value CTmin of the center thickness on the optical axis in all lenses of the fixed focus lens satisfy: CTmax/CTmin is less than or equal to 3.62 and less than or equal to 4.39.
In a preferred embodiment of the present utility model, the effective focal length F5 of the fifth lens and the total effective focal length F of the fixed focus lens satisfy: F5/F is less than or equal to-1.04 and less than or equal to-0.98.
In a preferred embodiment of the present utility model, a center distance BFL between an image side surface of the fifth lens element and an imaging surface of the fixed focus lens element, and a distance TTL between an object side surface center of the first lens element and the imaging surface of the fixed focus lens element satisfy the following conditions:
0.2≤BFL/TTL≤0.4。
in a preferred embodiment of the present utility model, a distance TTL between an object side surface center of the first lens and an imaging surface of the fixed focus lens on an optical axis and a total effective focal length F of the fixed focus lens satisfy:
TTL/F≤3.05。
in a preferred embodiment of the present utility model, the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens, and the total effective focal length F of the fixed focus lens satisfy:
14.22mm -1 ≤(Vd2+Vd3)/F≤14.26mm -1 。
the fixed focus lens provided by the embodiment of the utility model adopts five lenses, and at least one of the beneficial effects of high resolution, low cost, low distortion (optical distortion is less than or equal to minus 2.02%), miniaturization (TTL is less than 23 mm), large aperture (FNO is less than or equal to 2.20) and the like can be realized through the collocation of the focal power and the shape of each lens and the reasonable optical parameter setting.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an optical structure diagram of a fixed focus lens according to a first embodiment of the present utility model;
fig. 2 is a distortion diagram of a fixed focus lens according to a first embodiment of the present utility model;
fig. 3 is an optical structure schematic diagram of a fixed focus lens according to a second embodiment of the present utility model;
fig. 4 is a distortion diagram of a fixed focus lens according to a second embodiment of the present utility model;
FIG. 5 is a schematic view of an optical structure of a fixed focus lens according to a third embodiment of the present utility model;
FIG. 6 is a distortion diagram of a fixed focus lens according to a third embodiment of the present utility model;
fig. 7 is a schematic optical structure of a fixed focus lens according to a fourth embodiment of the present utility model;
fig. 8 is a distortion diagram of a fixed focus lens according to a fourth embodiment of the present utility model.
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 utility model 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 utility model is not particularly limited to the preferred embodiments. The scope of the utility model is defined by the claims.
In the present utility model, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging side is referred to as the image side of the lens.
As shown in fig. 1, 3, 5 and 7, the fixed focus lens according to the embodiment of the utility model sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 along the direction from the object side to the image side. The first lens L1 is a convex-concave lens with negative focal power, the second lens L2 is a convex-concave lens with negative focal power, the third lens L3 is a convex-convex lens with positive focal power, the fourth lens L4 is a convex-convex lens with positive focal power, and the fifth lens L5 is a concave-convex lens with negative focal power. The effective focal length F1 of the first lens L1 and the total effective focal length F of the fixed focus lens satisfy: the ratio of the effective focal length of the first lens L1 to the total effective focal length of the optical lens is reasonably configured, so that spherical aberration, coma aberration and astigmatism generated when incident light enters the optical system are balanced, and the imaging quality of the optical system is improved.
In the embodiment of the utility model, the first lens L1 has negative optical power, and the lens shape is a meniscus shape with a convex surface facing the object. Therefore, incident light rays with more fields of view can be converged into the optical system as much as possible, the field angle of the optical system is enlarged, the spherical aberration, the coma aberration and the astigmatism of the optical system are effectively balanced, and the imaging quality of the optical system is improved.
In the embodiment of the utility model, the second lens L2 has negative optical power, and the lens shape is a meniscus shape with a convex surface facing the image space. Therefore, the light beam can be effectively controlled to be lifted, the spherical aberration generated by the first lens L1 can be effectively balanced, and the imaging quality is improved. Meanwhile, the optical distortion of the edge view field of the imaging system can be effectively regulated and controlled, and the distortion amount of the edge view field is favorably controlled in a reasonable range.
In the embodiment of the utility model, the third lens L3 has positive optical power, and the lens shape is convex on both the object side and the image side. Therefore, the method is favorable for controlling the trend of light, realizes smooth transition of the light by compressing the angle of the incident light, effectively reduces the influence of the spherical aberration and the coma aberration of the third lens L3 on the optical lens, and greatly improves the imaging performance of the optical system.
In the embodiment of the utility model, the fourth lens L4 has positive optical power, and the lens shape is convex on both the object side and the image side. Therefore, the light beam can be smoothly transited to the rear of the optical system by effectively controlling the trend of the light beam, the spherical aberration and the astigmatism of the optical system are effectively corrected, and the imaging performance of the optical system is greatly improved. Meanwhile, the optical distortion can be effectively corrected, so that the absolute value of the optical distortion is less than or equal to 2.02%, the deformation degree of the image is greatly reduced, and the authenticity of the photographed object is effectively restored.
In the embodiment of the utility model, the fifth lens element L5 has a negative refractive power, a concave object-side surface and a convex image-side surface. Therefore, the shape difference between the object side surface of the fifth lens L5 and the image side surface of the fourth lens L4 is obvious, meanwhile, the reasonable collocation of positive and negative focal power of the fifth lens L5 and the fourth lens L4 is combined, the trend of light rays can be effectively controlled, various aberrations such as astigmatism, coma and spherical aberration generated by the fifth lens L5 can be corrected, the influence on the imaging quality of an optical lens is reduced, the imaging performance of an optical system is greatly improved, meanwhile, the optical distortion can be effectively corrected, the absolute value of the optical distortion is less than or equal to 2.02%, the deformation degree of an image is greatly reduced, and the reality of a shot object is effectively restored.
In the embodiment of the present utility model, the stop STO may be located between the second lens L2 and the third lens L3. Therefore, the light entering the optical system can be effectively converged, the total length of the optical system is shortened, the maximum light-transmitting aperture of the optical system is reduced, and the miniaturized design of the optical lens is facilitated.
In the embodiment of the present utility model, along the direction from the object side to the image side of the optical axis, the image plane image lens further has a flat panel CG and an image plane IMA sequentially disposed behind the fifth lens L5.
In the embodiment of the present utility model, the object-side curvature radius R11 of the first lens L1 and the effective focal length F1 of the first lens L1 satisfy: R11/F1 is less than or equal to-1.38 and less than or equal to-0.24. Therefore, the ratio of the curvature radius of the object side surface of the first lens L1 to the effective focal length value of the first lens L1 is reasonably configured, so that the lens shape of the first lens L1 is controlled, more view-field light rays are converged into the optical system, and the view angle of the optical system is effectively enlarged.
In the embodiment of the present utility model, the effective focal length F2 of the second lens L2 and the total effective focal length F of the fixed focus lens satisfy: -4.09.ltoreq.F2/F.ltoreq.3.84. Therefore, the ratio of the effective focal length value of the second lens L2 to the total effective focal length of the optical lens is reasonably configured, so that the trend of light rays is controlled, the light rays are lifted, the spherical aberration generated by the first lens L1 is effectively balanced, and the imaging quality is improved.
In the embodiment of the present utility model, the combined effective focal length F12 of the first lens L1 and the second lens L2 and the total effective focal length F of the fixed focus lens satisfy: F12/F is less than or equal to-1.46 and less than or equal to-1.33. Therefore, the ratio relation between the combined effective focal length of the first lens L1 and the combined effective focal length of the second lens L2 and the total effective focal length of the optical lens is reasonably configured, so that the off-axis aberration of the optical system can be corrected, the optical distortion of the edge view field of the imaging system can be effectively regulated and controlled, and the distortion quantity of the edge view field can be controlled within a reasonable range.
In the embodiment of the present utility model, the object-side radius of curvature R21 of the second lens L2 and the image-side radius of curvature R22 of the second lens L2 satisfy: -0.22 < ltoreq.R 21-R22)/(R21+R22) < 0.16. Therefore, the curvature radiuses of the object side surface and the image side surface of the second lens L2 are reasonably controlled, so that the lens shape of the second lens L2 is controlled, the light ray trend can be effectively controlled, the light ray is lifted, more incident light rays with a view field enter the rear of the optical system, and the illuminance is improved; meanwhile, under the condition of meeting the requirements of high resolution and illumination, the lens shape of the second lens L2 is reasonably controlled, so that the central thickness of the lens reaches the minimum value, and the miniaturization design of the optical system is realized.
In the embodiment of the present utility model, the image-side radius of curvature R22 of the second lens element L2, the object-side radius of curvature R31 of the third lens element L3, and the combined effective focal length F23 of the image-side radius of curvature R32, the second lens element L2 and the third lens element L3 satisfy: -0.84 < (R22+R31+R32)/F23 < 0.30. Therefore, the optical imaging system can be effectively enabled to have a larger entrance pupil diameter by reasonably adjusting and controlling the curvature radius of the image side surface of the second lens L2, the curvature radius of the object side surface and the image side surface of the third lens L3 and the combined effective focal length of the second lens L2 and the third lens L3, the maximum light flux is ensured, and the relative illumination of the optical system is improved.
In the embodiment of the present utility model, the combined effective focal length F345 of the third lens L3 to the fifth lens L5 and the total effective focal length F of the fixed focus lens satisfy: F345/F is more than or equal to 0.91 and less than or equal to 1.01. Therefore, by reasonably configuring the combined effective focal length of the third lens L3 to the fifth lens L5 and the total effective focal length of the optical lens, light rays of each field of view can be smoothly transited to the rear of the optical system, various aberrations generated by the light rays passing through the first lens L1 and the second lens L2 of the optical system are effectively balanced, and the imaging quality of the optical lens is improved.
In the embodiment of the utility model, the center thickness CT3 of the third lens element L3 on the optical axis, the center thickness CT4 of the fourth lens element L4 on the optical axis, and the center distance T34 between the object side surface of the third lens element L3 and the image side surface of the fourth lens element L4 on the optical axis satisfy: the ratio of (CT3+CT4)/T34 is more than or equal to 0.59 and less than or equal to 0.69. Therefore, the center thicknesses of the third lens L3 and the fourth lens L4 on the optical axis and the center distance between the object side surface of the third lens L3 and the image side surface of the fourth lens L4 on the optical axis are reasonably regulated, so that the generation of astigmatism is favorably inhibited, and meanwhile, the spherical aberration and the edge aberration are favorably corrected, and the imaging quality of an optical system is favorably improved; meanwhile, under the condition of meeting high resolution, the center distance from the object side surface of the third lens element L3 to the image side surface of the fourth lens element L4 on the optical axis reaches the minimum value through reasonable regulation and control, and the design of miniaturization of an optical system is facilitated.
In the embodiment of the present utility model, the object-side radius of curvature R41 of the fourth lens L4, the image-side radius of curvature R42 of the fourth lens L4, and the center thickness CT4 of the fourth lens L4 on the optical axis satisfy: -0.28.ltoreq.R41+R42)/CT 4.ltoreq.3.07. Therefore, the object side surface and the image side surface of the fourth lens L4 and the central thickness of the fourth lens L4 on the optical axis are reasonably regulated, the trend of light is effectively controlled, the deflection angle of incident light and emergent light of the fourth lens L4 is slowed down, the light smoothly enters the rear of the optical system, the tolerance sensitivity is reduced, and the improvement of the lens assembly yield is facilitated.
In the embodiment of the present utility model, the combined effective focal length F45 of the fourth lens L4 to the fifth lens L5 and the total effective focal length F of the fixed focus lens satisfy: F45/F is less than or equal to 2.1 and less than or equal to 3.18. Therefore, by reasonably configuring the ratio of the combined effective focal length of the fourth lens L4 to the fifth lens L5 to the total effective focal length of the optical lens, the optical distortion of the off-axis visual field can be effectively corrected, the absolute value of the optical distortion is less than or equal to 2.02%, the deformation degree of an image is greatly reduced, and meanwhile, various aberrations such as spherical aberration, coma aberration, astigmatism and the like are effectively corrected, so that the optical imaging performance is improved.
In the embodiment of the present utility model, the maximum value CTmax of the center thickness on the optical axis in all lenses of the fixed focus lens and the minimum value CTmin of the center thickness on the optical axis in all lenses of the fixed focus lens satisfy: CTmax/CTmin is less than or equal to 3.62 and less than or equal to 4.39. Therefore, the thickness of each lens of the optical lens is reasonably controlled, so that the effect of each lens is stable, the change of the light trend at high and low temperatures is small, and the lens is athermalized.
In the embodiment of the present utility model, the effective focal length F5 of the fifth lens L5 and the total effective focal length F of the fixed focus lens satisfy: F5/F is less than or equal to-1.04 and less than or equal to-0.98. Therefore, by reasonably setting the ratio of the effective focal length value of the fifth lens L5 to the total effective focal length of the optical lens, the trend of light is effectively controlled, so that the light is smoothly transited from the fifth lens L5 to an imaging surface, various aberrations such as astigmatism, coma aberration and spherical aberration generated by an optical system are corrected, the imaging performance of the optical system is greatly improved, meanwhile, the optical distortion can be effectively corrected, the absolute value of the optical distortion is less than or equal to 2.02%, the deformation degree of an image is greatly reduced, and the authenticity of a photographed object is effectively restored.
In the embodiment of the present utility model, the center distance BFL between the image side surface of the fifth lens L5 and the imaging surface of the fixed focus lens on the optical axis, and the distance TTL between the center of the object side surface of the first lens L1 and the imaging surface of the fixed focus lens on the optical axis satisfy: BFL/TTL is more than or equal to 0.2 and less than or equal to 0.4. Therefore, under the condition that the total length of the optical system is fixed, the assembly yield of the optical lens can be improved by reasonably controlling the center distance between the image side surface of the fifth lens L5 of the optical lens and the imaging surface of the fixed focus lens on the optical axis, and the installation of the optical element is facilitated to reserve space, so that the design elasticity of the optical lens is improved.
In the embodiment of the present utility model, the distance TTL between the center of the object side surface of the first lens L1 and the imaging surface of the fixed focus lens on the optical axis and the total effective focal length F of the fixed focus lens satisfy: TTL/F is less than or equal to 3.05. More preferably, 3.00. Ltoreq.TTL/F.ltoreq.3.05. Therefore, under the condition of a certain total effective focal length of the optical system, the distance between the center of the object side surface of the first lens L1 and the imaging surface of the optical lens is controlled to be smaller, so that miniaturization of the lens is facilitated, and the distance TTL between the center of the object side surface of the first lens and the imaging surface of the optical lens is smaller than 23mm.
In the embodiment of the present utility model, the abbe number Vd2 of the second lens L2, the abbe number Vd3 of the third lens L3, and the total effective focal length F of the fixed focus lens satisfy: 14.22mm -1 ≤(Vd2+Vd3)/F≤14.26mm -1 . Therefore, the abbe numbers of the second lens L2 and the third lens L3 are reasonably set, so that the chromatic aberration of the system can be effectively corrected, and the saturation of the color of the lens can be improved.
The fixed focus lens provided by the embodiment of the utility model adopts five lenses, and at least one of the beneficial effects of high resolution, low cost, low distortion (optical distortion is less than or equal to minus 2.02%), miniaturization (TTL is less than 23 mm), large aperture (FNO is less than or equal to 2.20) and the like can be realized through the collocation of the focal power and the shape of each lens and the reasonable optical parameter setting.
The following describes the fixed focus lens of the present utility model in detail with reference to the accompanying drawings and tables. In the following embodiments, the stop STO is denoted as one side and the image plane IMA is denoted as one side.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
conditional expression Example 1 Example two Example III Example IV
1.80≤|F1/F|≤2.01 1.87 1.98 1.92 1.94
-1.38≤R11/F1≤-0.24 -0.44 -0.68 -1.16 -1.19
-4.09≤F2/F≤-3.84 -3.88 -4.05 -4.05 -3.96
-1.46≤F12/F≤-1.33 -1.35 -1.44 -1.40 -1.39
-0.22≤(R21-R22)/(R21+R22)≤-0.16 -0.18 -0.21 -0.20 -0.20
-0.84≤(R22+R31+R32)/F23≤-0.30 -0.39 -0.75 -0.67 -0.69
0.91≤F345/F≤1.01 0.93 0.99 0.99 0.99
0.59≤(CT3+CT4)/T34≤0.69 0.61 0.67 0.67 0.67
-0.28≤(R41+R42)/CT4≤3.07 2.52 0.57 0.34 0.27
2.1≤F45/F≤3.18 3.01 2.32 2.32 2.28
3.62≤CTmax/CTmin≤4.39 3.93 3.75 4.23 4.27
-1.04≤F5/F≤-0.98 -1.01 -0.99 -1.00 -1.03
0.2≤BFL/TTL≤0.4 0.24 0.29 0.29 0.29
3.00≤TTL/F≤3.05 3.05 3.04 3.05 3.05
14.22≤(Vd2+Vd3)/F≤14.26(mm -1 ) 14.25 14.23 14.23 14.24
TABLE 1
In embodiments of the present utility model, the 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 y 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
Fig. 1 is a schematic optical structure diagram of a fixed focus lens according to a first embodiment of the present utility model.
Fig. 2 is a schematic distortion diagram of a fixed focus lens according to an embodiment of the utility model.
In this embodiment:
the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are aspherical lenses, and the third lens L3 is a spherical lens.
In the present embodiment, the radius of curvature R (mm), thickness d (mm), refractive index Nd, and abbe number Vd of each face of the fixed focus lens are referred to table 2:
face number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
1 Aspherical surface 5.999 2.000 1.54 55.71
2 Aspherical surface 2.928 2.459
3 Aspherical surface -3.125 1.510 1.64 23.53
4 Aspherical surface -4.473 0.751
5(STO) Spherical surface Infinity -0.316
6 Spherical surface 8.086 2.778 1.50 81.61
7 Spherical surface -6.856 2.960
8 Aspherical surface 11.359 3.615 1.54 55.71
9 Aspherical surface -3.914 0.319
10 Aspherical surface -2.230 0.920 1.64 23.53
11 Aspherical surface -4.814 4.502
12 Spherical surface Infinity 0.700 1.52 64.20
13 Spherical surface Infinity 0.304
14(IMG) Spherical surface Infinity 0.000
TABLE 2
In this embodiment, the K value and aspherical coefficients of the fixed focus lens are shown in table 3:
face number K value A4 A6 A8 A10 A12 A14 A16
1 -8.77 5.60E-03 -4.99E-04 4.82E-05 -4.11E-06 1.85E-07 -3.07E-09 -4.20E-11
2 0.09 1.86E-03 -4.18E-04 1.49E-04 -4.24E-05 2.36E-06 4.76E-07 -8.29E-08
3 -3.89 -6.54E-03 1.68E-03 -1.23E-04 -4.68E-05 2.04E-05 -3.18E-06 1.79E-07
4 -0.87 3.41E-03 -9.49E-05 1.01E-04 -3.78E-05 8.05E-06 -9.09E-07 4.15E-08
8 -33.55 4.42E-03 -4.82E-04 5.45E-05 -8.55E-06 8.46E-07 -4.79E-08 8.71E-10
9 -3.48 5.44E-03 -9.04E-04 7.24E-05 -2.63E-06 -3.76E-08 -8.11E-09 9.15E-10
10 -3.32 7.88E-03 -7.76E-04 1.01E-05 1.22E-05 -1.68E-06 8.19E-08 -8.25E-10
11 -6.77 1.32E-02 -1.55E-03 2.28E-04 -2.81E-05 2.80E-06 -1.92E-07 6.40E-09
TABLE 3 Table 3
With reference to fig. 1 and 2 and tables 1-3, the fixed focus lens of the present embodiment adopts five lenses, and at least one of the beneficial effects of high resolution, low cost, low distortion, miniaturization, large aperture, etc. can be achieved through the collocation of the focal power and shape of each lens and reasonable optical parameter setting. The fixed focus lens of the present embodiment has an optical distortion absolute value of 2.01% and an aperture value fno=2.20.
Example two
Fig. 3 is a schematic optical structure diagram of a fixed-focus lens according to a second embodiment of the utility model.
Fig. 4 is a schematic distortion diagram of a fixed focus lens according to a second embodiment of the present utility model.
In this embodiment:
the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are aspherical lenses, and the third lens L3 is a spherical lens.
In the present embodiment, the radius of curvature R (mm), thickness d (mm), refractive index Nd, and abbe number Vd of each face of the fixed focus lens are shown in table 4:
face number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
1 Aspherical surface 9.872 1.219 1.54 55.71
2 Aspherical surface 4.185 2.104
3 Aspherical surface -3.477 2.247 1.64 23.53
4 Aspherical surface -5.316 0.417
5(STO) Spherical surface Infinity -0.317
6 Spherical surface 8.690 2.566 1.50 81.61
7 Spherical surface -11.760 3.007
8 Aspherical surface 6.775 3.494 1.54 55.71
9 Aspherical surface -4.787 0.329
10 Aspherical surface -2.727 0.931 1.64 23.53
11 Aspherical surface -7.341 5.503
12 Spherical surface Infinity 0.700 1.52 64.20
13 Spherical surface Infinity 0.304
14(IMG) Spherical surface Infinity 0.000
TABLE 4 Table 4
In this embodiment, the K value and aspherical coefficients of the fixed focus lens are shown in table 5:
face number K value A4 A6 A8 A10 A12 A14 A16
1 -28.19 5.20E-03 -6.76E-04 8.30E-05 -8.32E-06 3.39E-07 1.69E-08 -1.27E-09
2 1.71 4.09E-04 -7.15E-04 8.51E-05 -3.99E-05 4.27E-06 -1.17E-07 -2.95E-08
3 -4.01 -7.69E-03 9.83E-04 -8.86E-05 -3.35E-05 1.83E-05 -3.52E-06 2.67E-07
4 0.14 1.73E-03 -1.65E-04 1.15E-04 -4.15E-05 8.30E-06 -8.58E-07 3.61E-08
8 -10.71 4.67E-03 -5.24E-04 6.39E-05 -8.44E-06 8.03E-07 -4.71E-08 1.16E-09
9 -2.97 5.05E-03 -9.31E-04 6.89E-05 -2.53E-06 3.21E-08 -1.65E-09 1.32E-10
10 -4.96 9.89E-03 -1.07E-03 -1.80E-06 1.27E-05 -1.54E-06 8.80E-08 -1.91E-09
11 -25.36 1.63E-02 -1.55E-03 1.89E-04 -2.71E-05 3.05E-06 -2.11E-07 6.77E-09
TABLE 5
With reference to fig. 3 and 4 and the above tables 1, 4 and 5, the fixed focus lens of the present embodiment adopts five lenses, and at least one of the beneficial effects of high resolution, low cost, low distortion, miniaturization, large aperture, etc. can be achieved by matching the focal power and shape of each lens and reasonable optical parameter setting. The fixed focus lens of this embodiment has an optical distortion absolute value of 2.02% and an aperture value FNO of 2.20.
Example III
Fig. 5 is a schematic optical structure diagram of a fixed-focus lens according to a third embodiment of the present utility model.
Fig. 6 is a schematic distortion diagram of a fixed focus lens according to a third embodiment of the present utility model.
In this embodiment:
the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are aspherical lenses, and the third lens L3 is a spherical lens.
In the present embodiment, the radius of curvature R (mm), thickness d (mm), refractive index Nd, and abbe number Vd of each face of the fixed focus lens are shown in table 6:
face number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
1 Aspherical surface 16.530 0.864 1.54 55.71
2 Aspherical surface 5.133 2.148
3 Aspherical surface -3.194 1.977 1.64 23.53
4 Aspherical surface -4.757 0.501
5(STO) Spherical surface Infinity -0.320
6 Spherical surface 8.929 2.657 1.50 81.61
7 Spherical surface -12.012 3.101
8 Aspherical surface 6.470 3.656 1.54 55.71
9 Aspherical surface -5.214 0.219
10 Aspherical surface -3.702 1.194 1.64 23.53
11 Aspherical surface -18.290 5.503
12 Spherical surface Infinity 0.700 1.52 64.20
13 Spherical surface Infinity 0.304
14(IMG) Spherical surface Infinity 0.000
TABLE 6
In this embodiment, the K value and aspherical coefficients of the fixed focus lens are shown in table 7:
TABLE 7
With reference to fig. 5 and 6 and the above tables 1, 6 and 7, the fixed focus lens of the present embodiment adopts five lenses, and at least one of the beneficial effects of high resolution, low cost, low distortion, miniaturization, large aperture, etc. can be achieved by matching the focal power and shape of each lens and reasonable optical parameter setting. The fixed focus lens of this embodiment has an optical distortion absolute value of 2.02% and an aperture value FNO of 2.20.
Example IV
Fig. 7 is a schematic optical structure diagram of a fixed-focus lens according to a fourth embodiment of the present utility model.
Fig. 8 is a distortion diagram of a fixed focus lens according to a fourth embodiment of the present utility model.
In this embodiment:
the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are aspherical lenses, and the third lens L3 is a spherical lens.
In the present embodiment, the radius of curvature R (mm), thickness d (mm), refractive index Nd, and abbe number Vd of each face of the fixed focus lens are referred to table 8:
face number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
1 Aspherical surface 16.974 0.863 1.54 55.71
2 Aspherical surface 5.202 2.147
3 Aspherical surface -3.122 1.935 1.64 23.53
4 Aspherical surface -4.650 0.515
5(STO) Spherical surface Infinity -0.342
6 Spherical surface 8.786 2.707 1.50 81.61
7 Spherical surface -12.346 3.104
8 Aspherical surface 6.395 3.681 1.54 55.71
9 Aspherical surface -5.390 0.193
10 Aspherical surface -3.925 1.192 1.64 23.53
11 Aspherical surface -21.924 5.503
12 Spherical surface Infinity 0.700 1.52 64.20
13 Spherical surface Infinity 0.304
14(IMG) Spherical surface Infinity 0.000
TABLE 8
In this embodiment, the K value and aspherical coefficients of the fixed focus lens are shown in table 9:
face number K value A4 A6 A8 A10 A12 A14 A16
1 -68.95 6.28E-03 -5.84E-04 -3.31E-05 2.60E-05 -5.01E-06 4.51E-07 -1.56E-08
2 3.16 4.56E-03 -9.34E-04 7.69E-05 -2.87E-05 5.13E-06 -7.33E-07 3.66E-08
3 -3.94 -1.08E-02 1.56E-03 -1.38E-04 -4.32E-05 2.37E-05 -4.35E-06 3.09E-07
4 -0.01 1.87E-03 -2.18E-04 1.58E-04 -5.50E-05 1.07E-05 -1.08E-06 4.38E-08
8 -10.29 4.84E-03 -5.55E-04 6.90E-05 -8.18E-06 7.14E-07 -3.80E-08 8.51E-10
9 -0.20 3.02E-03 -1.79E-04 1.92E-05 -2.59E-06 1.54E-07 -2.52E-09 -1.16E-11
10 -3.98 8.27E-03 -9.57E-04 3.55E-05 7.71E-06 -1.73E-06 1.38E-07 -3.78E-09
11 31.07 1.35E-02 -7.62E-04 1.32E-05 4.89E-06 -7.91E-07 3.63E-08 5.03E-10
TABLE 9
With reference to fig. 7 and 8 and the above tables 1, 8 and 9, the fixed focus lens of the present embodiment adopts five lenses, and at least one of the beneficial effects of high resolution, low cost, low distortion, miniaturization, large aperture, etc. can be achieved by matching the focal power and shape of each lens and reasonable optical parameter setting. The fixed focus lens of this embodiment has an optical distortion absolute value of 2.02% and an aperture value FNO of 2.20.
The foregoing description of the preferred embodiments of the utility model 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 utility model.

Claims (15)

1. The fixed focus lens sequentially comprises a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4) and a fifth lens (L5) along the direction from the object side to the image side, and is characterized in that,
the first lens (L1) is a convex-concave lens with negative focal power;
the second lens (L2) is a meniscus lens having negative optical power;
the third lens (L3) is a convex-convex lens with positive focal power;
the fourth lens (L4) is a convex-convex lens with positive focal power;
the fifth lens (L5) is a meniscus lens having negative optical power;
an effective focal length F1 of the first lens (L1) and a total effective focal length F of the fixed focus lens satisfy: F1/F is more than or equal to 1.80 and less than or equal to 2.01.
2. The fixed focus lens according to claim 1, wherein an object side radius of curvature R11 of the first lens (L1) and an effective focal length F1 of the first lens (L1) satisfy:
-1.38≤R11/F1≤-0.24。
3. the fixed focus lens according to claim 1, characterized in that the effective focal length F2 of the second lens (L2) and the total effective focal length F of the fixed focus lens satisfy:
-4.09≤F2/F≤-3.84。
4. the fixed focus lens according to claim 1, characterized in that the combined effective focal length F12 of the first lens (L1) and the second lens (L2) and the total effective focal length F of the fixed focus lens satisfy:
-1.46≤F12/F≤-1.33。
5. the fixed focus lens as claimed in claim 1, wherein an object side radius of curvature R21 of the second lens (L2) and an image side radius of curvature R22 of the second lens (L2) satisfy:
-0.22≤(R21-R22)/(R21+R22)≤-0.16。
6. the fixed focus lens as claimed in claim 1, wherein an image side curvature radius R22 of the second lens element (L2), an object side curvature radius R31 of the third lens element (L3), an image side curvature radius R32 of the third lens element (L3), and a combined effective focal length F23 of the second lens element (L2) and the third lens element (L3) satisfy:
-0.84≤(R22+R31+R32)/F23≤-0.30。
7. the fixed focus lens according to claim 1, wherein a combined effective focal length F345 of the third lens (L3) to the fifth lens (L5) and a total effective focal length F of the fixed focus lens satisfy:
0.91≤F345/F≤1.01。
8. the fixed focus lens as claimed in claim 1, wherein a center thickness CT3 of the third lens element (L3) on the optical axis, a center thickness CT4 of the fourth lens element (L4) on the optical axis, and a center distance T34 from an object side surface of the third lens element (L3) to an image side surface of the fourth lens element (L4) on the optical axis satisfy:
0.59≤(CT3+CT4)/T34≤0.69。
9. the fixed focus lens as claimed in claim 1, wherein an object-side radius of curvature R41 of the fourth lens (L4), an image-side radius of curvature R42 of the fourth lens (L4), and a center thickness CT4 of the fourth lens (L4) on an optical axis satisfy:
-0.28≤(R41+R42)/CT4≤3.07。
10. the fixed focus lens according to claim 1, wherein a combined effective focal length F45 of the fourth lens (L4) to the fifth lens (L5) and a total effective focal length F of the fixed focus lens satisfy:
2.1≤F45/F≤3.18。
11. the fixed focus lens according to claim 1, wherein a maximum value CTmax of center thicknesses of all lenses of the fixed focus lens on an optical axis and a minimum value CTmin of center thicknesses of all lenses of the fixed focus lens on an optical axis satisfy:
3.62≤CTmax/CTmin≤4.39。
12. the fixed focus lens according to claim 1, characterized in that the effective focal length F5 of the fifth lens (L5) and the total effective focal length F of the fixed focus lens satisfy:
-1.04≤F5/F≤-0.98。
13. the fixed focus lens according to claim 1, wherein a center distance BFL between an image side surface of the fifth lens element (L5) and an imaging surface of the fixed focus lens element, and a distance TTL between an object side surface center of the first lens element (L1) and the imaging surface of the fixed focus lens element, satisfy the following conditions:
0.2≤BFL/TTL≤0.4。
14. the fixed focus lens according to claim 1, wherein a distance TTL on an optical axis from an object side center of the first lens (L1) to an imaging surface of the fixed focus lens and a total effective focal length F of the fixed focus lens satisfy:
TTL/F≤3.05。
15. the fixed focus lens according to claim 1, wherein the abbe number Vd2 of the second lens (L2), the abbe number Vd3 of the third lens (L3) and the total effective focal length F of the fixed focus lens satisfy:
14.22mm -1 ≤(Vd2+Vd3)/F≤14.26mm -1 。
CN202321450358.5U 2023-06-07 2023-06-07 Fixed focus lens Active CN220232090U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publications (1)

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CN220232090U true CN220232090U (en) 2023-12-22

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